1. The glass fiber reinforced plastic with low hardness and corrosion resistance is characterized by comprising 30-50 parts of modified polyurethane resin, 1-5 parts of curing agent, 1-5 parts of flame retardant, 1-5 parts of antioxidant and 1-5 parts of release agent.

2. The glass fiber reinforced plastic with low hardness and corrosion resistance of claim 1, wherein: the modified polyurethane resin is prepared by reacting pre-modified polyurethane resin with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise.

3. The glass fiber reinforced plastic with low hardness and corrosion resistance of claim 2, wherein: the pre-modified polyurethane resin is prepared by the temperature rise reaction of pre-treated polyurethane resin and vinyl chloride monomer under the condition that tert-butyl peroxybenzoate is used as a catalyst.

4. The glass fiber reinforced plastic with low hardness and corrosion resistance of claim 3, wherein: the pretreated polyurethane resin is prepared by diluting and emulsifying the polyurethane resin, adding copper powder and iron powder into the polyurethane resin, mixing to obtain mixed powder, and then pressing and coating the polyurethane resin on glass fibers.

5. The glass fiber reinforced plastic with low hardness and corrosion resistance of claim 4, wherein: the curing agent is one or more of vinyl triamine DETA, diaminocyclohexane DACH and isophorone diamine IPDA; the flame retardant is one or more of aluminum hydroxide, monoammonium phosphate, ammonium chloride and boric acid; the antioxidant is one or more of butylated hydroxyanisole, butylated hydroxytoluene and tert-butylhydroquinone; the release agent is one or more of silicone ester, polyethylene glycol and low molecular weight polyethylene.

6. The preparation method of the glass fiber reinforced plastic with low hardness and corrosion resistance is characterized by comprising the following specific steps of:

(1) the preparation method of the pretreated polyurethane resin comprises the following steps: diluting and emulsifying polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fiber to prepare pretreated polyurethane resin;

(2) the preparation method of the pre-modified polyurethane resin comprises the following steps: heating the pretreated polyurethane resin prepared in the step (1) and vinyl chloride monomer to react under the condition that tert-butyl peroxybenzoate is used as a catalyst to prepare a pre-modified polyurethane resin;

(3) the preparation method of the modified polyurethane resin comprises the following steps: reacting the pre-modified polyurethane resin prepared in the step (2) with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise to prepare modified polyurethane resin;

(4) the preparation method of the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following steps: and (3) adding 3 parts of curing agent, 3 parts of flame retardant, 3 parts of antioxidant and 3 parts of release agent into the modified polyurethane resin prepared in the step (3), uniformly stirring, and then performing film pressing operation to prepare the glass fiber reinforced plastic with low hardness and corrosion resistance.

7. The method for preparing the glass fiber reinforced plastic with low hardness and corrosion resistance according to claim 6, wherein the preparation method of the pre-treated polyurethane resin in the step (1) comprises the following steps: diluting and emulsifying polyurethane resin by using an acetone solution for later use; uniformly mixing 5g of copper powder and 15g of iron powder, weighing 60g of diluted and emulsified polyurethane resin, adding the polyurethane resin into the mixed powder, adding 0.5g of sodium hexametaphosphate, rapidly and uniformly stirring to uniformly disperse the mixed powder into the polyurethane resin, press-coating the resin on 30g of glass fiber to completely soak the glass fiber with the resin, and uniformly stirring to obtain the pretreated polyurethane resin.

8. The method for preparing the glass fiber reinforced plastic with low hardness and corrosion resistance according to claim 6, wherein the preparation method of the pre-modified polyurethane resin in the step (2) comprises the following steps: adding 3g of vinyl chloride monomer and 1.3g of pretreated polyurethane resin into a three-neck flask, then adding 20ml of ethyl acetate solution and a stirrer, raising the temperature to 50 ℃, stirring for reaction for 1h, slowly dripping 3ml of tert-butyl peroxybenzoate solution into the three-neck flask, continuing raising the temperature to 80 ℃, stirring for reaction for 2h, carrying out suction filtration on a reaction system, washing an obtained product with distilled water, carrying out suction filtration again, and then drying a filter cake in a drying box at 50 ℃ by hot air to obtain the pre-modified polyurethane resin.

9. The method for preparing the glass fiber reinforced plastic with low hardness and corrosion resistance according to claim 6, wherein the modified polyurethane resin in the step (3) is prepared by the following steps: weighing 30g of pre-modified polyurethane resin, placing the pre-modified polyurethane resin in a water bath kettle preheated at 60 ℃ for 1h for heating, then adding 10ml of 2mol/L sodium alkyl benzene sulfonate aqueous solution, fully stirring and reacting, continuing to increase the temperature to 80 ℃, stirring and reacting for 1h, then adding 8ml of triethanolamine, continuing to increase the temperature to 95 ℃, continuing to react for 2h, then reducing the temperature to 50 ℃, and preserving the temperature and reacting for 30min to obtain the modified polyurethane resin.

10. The method for preparing the glass fiber reinforced plastic with low hardness and corrosion resistance according to claim 6, wherein the method for preparing the glass fiber reinforced plastic with low hardness and corrosion resistance in the step (4) comprises the following steps: 3g of curing agent diaminocyclohexane DACH, 2g of flame retardant monoammonium phosphate, 2.4g of antioxidant butyl hydroxy anisole and 3g of release agent silicone ester are added into 20g of modified polyurethane resin, and then the mixture is stirred uniformly, and then film pressing operation is carried out, so that the glass fiber reinforced plastic with low hardness and corrosion resistance is prepared.

Background

The glass fiber reinforced plastic is also called glass fiber reinforced plastic, and is reinforced plastic with glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin matrix and glass fiber or its product as reinforcing material. The glass fiber reinforced plastic has the characteristics of light weight, hardness, non-conductivity, stable performance, high mechanical strength, less recycling, corrosion resistance and the like, and can replace steel materials to manufacture machine parts, automobile shells, ship shells and the like.

The glass fiber reinforced plastic prepared by the application is applied to KTV song rooms in cities, and is a good choice as a product and a wall coating. The application preparation's glass steel its surface resin forms anomalous pit under the effect of tension in the shaping, anomalous pit has the effect of sound absorption when pleasing to the eye, triethanolamine forms stable fine and close network structure with the polyurethane resin of modifying in advance under the effect of sodium alkyl benzene sulfonate aqueous solution, form crisscross network system with the netted winding of polyvinyl chloride, when greatly increased glass steel mechanical properties, the network structure on surface can show prominently under the effect of surface tension and become spatial structure, greatly increased the effect of glass steel sound absorption, effectively prevented that sound is too big to cause the phenomenon of disturbing the people.

Disclosure of Invention

The invention aims to provide the glass fiber reinforced plastic with low hardness and corrosion resistance so as to solve the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following raw materials in parts by weight:

30-50 parts of modified polyurethane resin, 1-5 parts of curing agent, 1-5 parts of flame retardant, 1-5 parts of antioxidant and 1-5 parts of release agent.

Preferably, the modified polyurethane resin is prepared by reacting pre-modified polyurethane resin with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise.

Preferably, the pre-modified polyurethane resin is prepared by the temperature-rising reaction of the pre-treated polyurethane resin and vinyl chloride monomer under the condition that tert-butyl peroxybenzoate is used as a catalyst.

Preferably, the pretreated polyurethane resin is prepared by diluting and emulsifying the polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fibers.

Preferably, the curing agent is one or more of vinyl triamine DETA, diaminocyclohexane DACH and isophorone diamine IPDA; the flame retardant is one or more of aluminum hydroxide, monoammonium phosphate, ammonium chloride and boric acid; the antioxidant is one or more of butylated hydroxyanisole, butylated hydroxytoluene and tert-butylhydroquinone; the release agent is one or more of silicone ester, polyethylene glycol and low molecular weight polyethylene.

The invention provides a preparation method of glass fiber reinforced plastic with low hardness and corrosion resistance, which is characterized by comprising the following specific steps:

(1) the preparation method of the pretreated polyurethane resin comprises the following steps: diluting and emulsifying polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fiber to prepare pretreated polyurethane resin;

(2) the preparation method of the pre-modified polyurethane resin comprises the following steps: heating the pretreated polyurethane resin prepared in the step (1) and vinyl chloride monomer to react under the condition that tert-butyl peroxybenzoate is used as a catalyst to prepare a pre-modified polyurethane resin;

(3) the preparation method of the modified polyurethane resin comprises the following steps: reacting the pre-modified polyurethane resin prepared in the step (2) with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise to prepare modified polyurethane resin;

(4) the preparation method of the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following steps: and (3) adding 3 parts of curing agent, 3 parts of flame retardant, 3 parts of antioxidant and 3 parts of release agent into the modified polyurethane resin prepared in the step (3), uniformly stirring, and then performing film pressing operation to prepare the glass fiber reinforced plastic with low hardness and corrosion resistance.

Preferably, the preparation method of the pretreated polyurethane resin in the step (1) comprises the following steps: diluting and emulsifying polyurethane resin by using an acetone solution for later use; uniformly mixing 5g of copper powder and 15g of iron powder, weighing 60g of diluted and emulsified polyurethane resin, adding the polyurethane resin into the mixed powder, adding 0.5g of sodium hexametaphosphate, rapidly and uniformly stirring to uniformly disperse the mixed powder into the polyurethane resin, press-coating the resin on 30g of glass fiber to completely soak the glass fiber with the resin, and uniformly stirring to obtain the pretreated polyurethane resin.

Preferably, the preparation method of the pre-modified polyurethane resin in the step (2) comprises the following steps: adding 3g of vinyl chloride monomer and 1.3g of pretreated polyurethane resin into a three-neck flask, then adding 20ml of ethyl acetate solution and a stirrer, raising the temperature to 50 ℃, stirring for reaction for 1h, slowly dripping 3ml of tert-butyl peroxybenzoate solution into the three-neck flask, continuing raising the temperature to 80 ℃, stirring for reaction for 2h, carrying out suction filtration on a reaction system, washing an obtained product with distilled water, carrying out suction filtration again, and then drying a filter cake in a drying box at 50 ℃ by hot air to obtain the pre-modified polyurethane resin.

Preferably, the preparation method of the modified polyurethane resin in the step (3) comprises the following steps: weighing 30g of pre-modified polyurethane resin, placing the pre-modified polyurethane resin in a water bath kettle preheated at 60 ℃ for 1h for heating, then adding 10ml of 2mol/L sodium alkyl benzene sulfonate aqueous solution, fully stirring and reacting, continuing to increase the temperature to 80 ℃, stirring and reacting for 1h, then adding 8ml of triethanolamine, continuing to increase the temperature to 95 ℃, continuing to react for 2h, then reducing the temperature to 50 ℃, and preserving the temperature and reacting for 30min to obtain the modified polyurethane resin.

Preferably, the preparation method of the low-hardness and corrosion-resistant glass fiber reinforced plastic in the step (4) comprises the following steps: 3g of curing agent diaminocyclohexane DACH, 2g of flame retardant monoammonium phosphate, 2.4g of antioxidant butyl hydroxy anisole and 3g of release agent silicone ester are added into 20g of modified polyurethane resin, and then the mixture is stirred uniformly, and then film pressing operation is carried out, so that the glass fiber reinforced plastic with low hardness and corrosion resistance is prepared.

Compared with the prior art, the invention has the following beneficial effects:

uniformly mixing copper powder and iron powder according to the mass ratio of 1:3 to obtain mixed powder, adding the mixed powder 0.3 times of polyurethane resin into the polyurethane resin, uniformly stirring, and then pressing and coating the mixed powder on glass fibers 0.5 times of the polyurethane resin to completely soak the glass fibers to obtain pretreated polyurethane resin; heating vinyl chloride monomer and pretreated polyurethane resin under the condition of taking tert-butyl peroxybenzoate as a catalyst to react, so that the vinyl chloride monomer is subjected to chain growth on the nodes of the pretreated polyurethane resin to form polyvinyl chloride grafted on the molecular main chain of the pretreated polyurethane resin, and the pretreated polyurethane resin is generated; the glass fiber and the matrix resin have excellent interface bonding force and can be uniformly dispersed in the matrix resin; the resin is easy to rub and generate electricity, the pretreated polyurethane resin has excellent conductivity due to the addition of the mixed powder, the electrostatic safety of the resin is ensured, but the nanoscale powder is easy to invade into the resin molecules, so that the molecular acting force among the resin molecules is reduced, polyvinyl chloride on the main chain of the pretreated polyurethane resin molecules can form net-shaped winding coating with matrix resin, the powder and the proportion are limited to be fixed in a grid, the molecular stability of the pretreated polyurethane resin is improved, the reduction of the mechanical property of the resin matrix due to the split addition is increased, and the wear resistance of the pretreated polyurethane resin is improved.

Setting the temperature of a water bath kettle at 60 ℃ for preheating, placing 30g of pre-modified polyurethane resin in the preheated water bath kettle, adding 10ml of 2mol/L sodium alkyl benzene sulfonate aqueous solution, fully stirring for reaction, then adding 8ml of triethanolamine, raising the temperature to 95 ℃, fully reacting to obtain modified polyurethane resin, adding a curing agent, a flame retardant, an antioxidant and a release agent into the modified polyurethane resin, uniformly stirring, and then carrying out film pressing operation to obtain a finished product of glass fiber reinforced plastic; when the glass fiber reinforced plastic prepared by the method is applied to a KTV (Karaoke television) house, at the heating temperature of a water bath kettle, the long-chain molecules of the sodium alkyl benzene sulfonate are intertwined with the pre-modified polyurethane resin, so that the mechanical property of the modified polyurethane resin is improved, and the surface tension of the modified polyurethane resin is reduced, so that the surface resin of the modified polyurethane resin forms irregular pits under the action of tension while the glass fiber reinforced plastic finished product is formed, and the irregular pits have the sound absorption effect while the glass fiber reinforced plastic finished product is attractive; triethanolamine forms a stable and compact net structure with pre-modified polyurethane resin under the action of sodium alkyl benzene sulfonate aqueous solution, and forms a crossed net system with the net winding of polyvinyl chloride, so that the mechanical property of the glass fiber reinforced plastic is greatly improved, and simultaneously, the net structure on the surface can be highlighted under the action of surface tension to form a three-dimensional structure, thereby greatly improving the sound absorption effect of the glass fiber reinforced plastic and effectively preventing the phenomenon of disturbing residents caused by overlarge sound.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides the technical scheme that: the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following raw materials in parts by weight:

30-50 parts of modified polyurethane resin, 1-5 parts of curing agent, 1-5 parts of flame retardant, 1-5 parts of antioxidant and 1-5 parts of release agent.

Preferably, the modified polyurethane resin is prepared by reacting pre-modified polyurethane resin with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise.

Preferably, the pre-modified polyurethane resin is prepared by the temperature-rising reaction of the pre-treated polyurethane resin and vinyl chloride monomer under the condition that tert-butyl peroxybenzoate is used as a catalyst.

Preferably, the pretreated polyurethane resin is prepared by diluting and emulsifying the polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fibers.

Preferably, the curing agent is one or more of vinyl triamine DETA, diaminocyclohexane DACH and isophorone diamine IPDA; the flame retardant is one or more of aluminum hydroxide, monoammonium phosphate, ammonium chloride and boric acid; the antioxidant is one or more of butylated hydroxyanisole, butylated hydroxytoluene and tert-butylhydroquinone; the release agent is one or more of silicone ester, polyethylene glycol and low molecular weight polyethylene.

The invention provides a preparation method of glass fiber reinforced plastic with low hardness and corrosion resistance, which is characterized by comprising the following specific steps:

(1) the preparation method of the pretreated polyurethane resin comprises the following steps: diluting and emulsifying polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fiber to prepare pretreated polyurethane resin;

(2) the preparation method of the pre-modified polyurethane resin comprises the following steps: heating the pretreated polyurethane resin prepared in the step (1) and vinyl chloride monomer to react under the condition that tert-butyl peroxybenzoate is used as a catalyst to prepare a pre-modified polyurethane resin;

(3) the preparation method of the modified polyurethane resin comprises the following steps: reacting the pre-modified polyurethane resin prepared in the step (2) with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise to prepare modified polyurethane resin;

(4) the preparation method of the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following steps: and (3) adding 3 parts of curing agent, 3 parts of flame retardant, 3 parts of antioxidant and 3 parts of release agent into the modified polyurethane resin prepared in the step (3), uniformly stirring, and then performing film pressing operation to prepare the glass fiber reinforced plastic with low hardness and corrosion resistance.

Preferably, the preparation method of the pretreated polyurethane resin in the step (1) comprises the following steps: diluting and emulsifying polyurethane resin by using an acetone solution for later use; uniformly mixing 5g of copper powder and 15g of iron powder, weighing 60g of diluted and emulsified polyurethane resin, adding the polyurethane resin into the mixed powder, adding 0.5g of sodium hexametaphosphate, rapidly and uniformly stirring to uniformly disperse the mixed powder into the polyurethane resin, press-coating the resin on 30g of glass fiber to completely soak the glass fiber with the resin, and uniformly stirring to obtain the pretreated polyurethane resin.

Preferably, the preparation method of the pre-modified polyurethane resin in the step (2) comprises the following steps: adding 3g of vinyl chloride monomer and 1.3g of pretreated polyurethane resin into a three-neck flask, then adding 20ml of ethyl acetate solution and a stirrer, raising the temperature to 50 ℃, stirring for reaction for 1h, slowly dripping 3ml of tert-butyl peroxybenzoate solution into the three-neck flask, continuing raising the temperature to 80 ℃, stirring for reaction for 2h, carrying out suction filtration on a reaction system, washing an obtained product with distilled water, carrying out suction filtration again, and then drying a filter cake in a drying box at 50 ℃ by hot air to obtain the pre-modified polyurethane resin.

Preferably, the preparation method of the modified polyurethane resin in the step (3) comprises the following steps: weighing 30g of pre-modified polyurethane resin, placing the pre-modified polyurethane resin in a water bath kettle preheated at 60 ℃ for 1h for heating, then adding 10ml of 2mol/L sodium alkyl benzene sulfonate aqueous solution, fully stirring and reacting, continuing to increase the temperature to 80 ℃, stirring and reacting for 1h, then adding 8ml of triethanolamine, continuing to increase the temperature to 95 ℃, continuing to react for 2h, then reducing the temperature to 50 ℃, and preserving the temperature and reacting for 30min to obtain the modified polyurethane resin.

Preferably, the preparation method of the low-hardness and corrosion-resistant glass fiber reinforced plastic in the step (4) comprises the following steps: 3g of curing agent diaminocyclohexane DACH, 2g of flame retardant monoammonium phosphate, 2.4g of antioxidant butyl hydroxy anisole and 3g of release agent silicone ester are added into 20g of modified polyurethane resin, and then the mixture is stirred uniformly, and then film pressing operation is carried out, so that the glass fiber reinforced plastic with low hardness and corrosion resistance is prepared.

Example 1: the first glass fiber reinforced plastic with low hardness and corrosion resistance:

the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following components in parts by mass:

30 parts of modified polyurethane resin, 3g of curing agent diaminocyclohexane DACH, 2g of flame retardant monoammonium phosphate, 2g of antioxidant butylated hydroxyanisole and 3g of release agent silicone ester.

The preparation method of the glass fiber reinforced plastic comprises the following steps:

(1) the preparation method of the pretreated polyurethane resin comprises the following steps: diluting and emulsifying polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fiber to prepare pretreated polyurethane resin;

(2) the preparation method of the pre-modified polyurethane resin comprises the following steps: heating the pretreated polyurethane resin prepared in the step (1) and vinyl chloride monomer to react under the condition that tert-butyl peroxybenzoate is used as a catalyst to prepare a pre-modified polyurethane resin;

(3) the preparation method of the modified polyurethane resin comprises the following steps: reacting the pre-modified polyurethane resin prepared in the step (2) with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise to prepare modified polyurethane resin;

(4) the preparation method of the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following steps: and (3) adding 3g of curing agent diaminocyclohexane DACH, 2g of flame retardant monoammonium phosphate, 2g of antioxidant butyl hydroxy anisole and 3g of release agent silicone ester into the modified polyurethane resin prepared in the step (3), uniformly stirring, and then performing film pressing operation to prepare the glass fiber reinforced plastic with low hardness and corrosion resistance.

Preferably, the preparation method of the pretreated polyurethane resin in the step (1) comprises the following steps: diluting and emulsifying polyurethane resin by using an acetone solution for later use; uniformly mixing 5g of copper powder and 15g of iron powder, weighing 60g of diluted and emulsified polyurethane resin, adding the polyurethane resin into the mixed powder, adding 0.5g of sodium hexametaphosphate, rapidly and uniformly stirring to uniformly disperse the mixed powder into the polyurethane resin, press-coating the resin on 30g of glass fiber to completely soak the glass fiber with the resin, and uniformly stirring to obtain the pretreated polyurethane resin.

Preferably, the preparation method of the pre-modified polyurethane resin in the step (2) comprises the following steps: adding 3g of vinyl chloride monomer and 1.3g of pretreated polyurethane resin into a three-neck flask, then adding 20ml of ethyl acetate solution and a stirrer, raising the temperature to 50 ℃, stirring for reaction for 1h, slowly dripping 3ml of tert-butyl peroxybenzoate solution into the three-neck flask, continuing raising the temperature to 80 ℃, stirring for reaction for 2h, carrying out suction filtration on a reaction system, washing an obtained product with distilled water, carrying out suction filtration again, and then drying a filter cake in a drying box at 50 ℃ by hot air to obtain the pre-modified polyurethane resin.

Preferably, the preparation method of the modified polyurethane resin in the step (3) comprises the following steps: weighing 30g of pre-modified polyurethane resin, placing the pre-modified polyurethane resin in a water bath kettle preheated at 60 ℃ for 1h for heating, then adding 10ml of 2mol/L sodium alkyl benzene sulfonate aqueous solution, fully stirring and reacting, continuing to increase the temperature to 80 ℃, stirring and reacting for 1h, then adding 8ml of triethanolamine, continuing to increase the temperature to 95 ℃, continuing to react for 2h, then reducing the temperature to 50 ℃, and preserving the temperature and reacting for 30min to obtain the modified polyurethane resin.

Preferably, the preparation method of the low-hardness and corrosion-resistant glass fiber reinforced plastic in the step (4) comprises the following steps: 3g of curing agent diaminocyclohexane DACH, 2g of flame retardant monoammonium phosphate, 2g of antioxidant butyl hydroxy anisole and 3g of release agent silicone ester are added into 20g of modified polyurethane resin, then the mixture is stirred uniformly, and then the film pressing operation is carried out, thus obtaining the glass fiber reinforced plastic with low hardness and corrosion resistance.

Example 2: and (2) the glass fiber reinforced plastic with low hardness and corrosion resistance:

the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following components in parts by mass:

43 parts of modified polyurethane resin, 4g of curing agent diaminocyclohexane DACH, 5g of flame retardant monoammonium phosphate, 3g of antioxidant butylated hydroxyanisole and 4g of release agent silicone ester.

The preparation method of the glass fiber reinforced plastic comprises the following steps:

(1) the preparation method of the pretreated polyurethane resin comprises the following steps: diluting and emulsifying polyurethane resin, adding mixed powder prepared by mixing copper powder and iron powder into the polyurethane resin, and then pressing and coating the polyurethane resin on glass fiber to prepare pretreated polyurethane resin;

(2) the preparation method of the pre-modified polyurethane resin comprises the following steps: heating the pretreated polyurethane resin prepared in the step (1) and vinyl chloride monomer to react under the condition that tert-butyl peroxybenzoate is used as a catalyst to prepare a pre-modified polyurethane resin;

(3) the preparation method of the modified polyurethane resin comprises the following steps: reacting the pre-modified polyurethane resin prepared in the step (2) with sodium alkyl benzene sulfonate aqueous solution and triethanolamine under the condition of temperature rise to prepare modified polyurethane resin;

(4) the preparation method of the glass fiber reinforced plastic with low hardness and corrosion resistance comprises the following steps: and (3) adding 4g of curing agent diaminocyclohexane DACH, 5g of flame retardant monoammonium phosphate, 3g of antioxidant butyl hydroxy anisole and 4g of release agent silicone ester into the modified polyurethane resin prepared in the step (3), uniformly stirring, and then performing film pressing operation to prepare the glass fiber reinforced plastic with low hardness and corrosion resistance.

Preferably, the preparation method of the pretreated polyurethane resin in the step (1) comprises the following steps: diluting and emulsifying polyurethane resin by using an acetone solution for later use; uniformly mixing 5g of copper powder and 15g of iron powder, weighing 60g of diluted and emulsified polyurethane resin, adding the polyurethane resin into the mixed powder, adding 0.5g of sodium hexametaphosphate, rapidly and uniformly stirring to uniformly disperse the mixed powder into the polyurethane resin, press-coating the resin on 30g of glass fiber to completely soak the glass fiber with the resin, and uniformly stirring to obtain the pretreated polyurethane resin.

Preferably, the preparation method of the pre-modified polyurethane resin in the step (2) comprises the following steps: adding 3g of vinyl chloride monomer and 1.3g of pretreated polyurethane resin into a three-neck flask, then adding 20ml of ethyl acetate solution and a stirrer, raising the temperature to 50 ℃, stirring for reaction for 1h, slowly dripping 3ml of tert-butyl peroxybenzoate solution into the three-neck flask, continuing raising the temperature to 80 ℃, stirring for reaction for 2h, carrying out suction filtration on a reaction system, washing an obtained product with distilled water, carrying out suction filtration again, and then drying a filter cake in a drying box at 50 ℃ by hot air to obtain the pre-modified polyurethane resin.

Preferably, the preparation method of the modified polyurethane resin in the step (3) comprises the following steps: weighing 30g of pre-modified polyurethane resin, placing the pre-modified polyurethane resin in a water bath kettle preheated at 60 ℃ for 1h for heating, then adding 10ml of 2mol/L sodium alkyl benzene sulfonate aqueous solution, fully stirring and reacting, continuing to increase the temperature to 80 ℃, stirring and reacting for 1h, then adding 8ml of triethanolamine, continuing to increase the temperature to 95 ℃, continuing to react for 2h, then reducing the temperature to 50 ℃, and preserving the temperature and reacting for 30min to obtain the modified polyurethane resin.

Preferably, the preparation method of the low-hardness and corrosion-resistant glass fiber reinforced plastic in the step (4) comprises the following steps: 4g of diaminocyclohexane DACH as a curing agent, 5g of monoammonium phosphate as a flame retardant, 3g of butylated hydroxyanisole as an antioxidant and 4g of silicon ester as a release agent are added into 40g of modified polyurethane resin, the mixture is uniformly stirred, and then film pressing operation is carried out to prepare the glass fiber reinforced plastic with low hardness and corrosion resistance.

Comparative example 1:

the formulation of comparative example 1 was the same as example 1. The manufacturing method of the glass fiber reinforced plastic is different from that of example 1 only in that the manufacturing process of step (1) is not performed, and the rest of the manufacturing steps are the same as those of example 1.

Comparative example 2:

comparative example 2 was formulated as in example 1. The manufacturing method of the glass fiber reinforced plastic is different from that of example 1 only in that the manufacturing process of step (2) is not performed, and the rest of the manufacturing steps are the same as those of example 1.

Comparative example 3:

the formulation of comparative example 3 was the same as example 1. The manufacturing method of the glass fiber reinforced plastic is different from that of example 1 only in that the manufacturing process of step (3) is not performed, and the rest of the manufacturing steps are the same as those of example 1.

Test example 1:

the glass fiber reinforced plastics prepared from the components of example 1, example 2 and comparative example 2 are subjected to an abrasion resistance test, and the test method comprises the following steps: the glass fiber reinforced plastics of example 1, example 2 and comparative example 2, which had a mass of 20g, were rubbed 1000 times and 2000 times under a load of 10.0N, respectively, and then weighed, and the larger the mass compared with the mass of the glass fiber reinforced plastics after rubbing, the better the wear resistance. The experimental results are as follows:

	example 1	Example 2	Comparative example 2
				Mass before friction	20.0g	20.0g	20.0g
Mass after 1000 times of friction	19.8g	19.5g	17.3g
				Mass after 2000 rubs	19.1g	18.3g	15.8g

As can be seen from the above table, after the abrasion resistance test, the glass fiber reinforced plastic of the example 1 component and the glass fiber reinforced plastic of the example 2 component show good abrasion resistance, and the glass fiber reinforced plastic of the comparative example 2 component has greatly reduced abrasion resistance compared to the example 1 and the example 2, and the difference is that no net-shaped structure is generated inside the resin, which indicates that polyvinyl chloride forms a net-shaped winding coating with the matrix resin, thereby increasing the decrease of mechanical properties of the resin matrix due to the split addition, and increasing the abrasion resistance of the pre-modified polyurethane resin.

Test example 2:

the glass fiber reinforced plastics of the components of the embodiment 1, the embodiment 2 and the comparative example 3 are subjected to a material sound absorption test, the glass fiber reinforced plastics prepared by the method are made into ornaments and put into a KTV song room for testing, a decibel meter is used for testing the ornaments outside the door under the condition of closing the door, the smaller the measured decibel is, the better the sacrificial effect of the glass fiber reinforced plastics is, and the test result is as follows:

	example 1	Example 2	Comparative example 3
				Indoor decibel measurement	90dB	90dB	90dB
Outdoor measured decibel	49dB	47dB	77dB

Decibel is mainly used for measuring the intensity of sound, the limit value of environmental noise is specified, KTV can not exceed 70 decibel in the daytime, as can be seen from the above table, the glass fiber reinforced plastic prepared by the components of the embodiment 1 and the embodiment 2 shows good sound absorption effect, the glass fiber reinforced plastic prepared by the component of the comparative example 3 shows far worse sound absorption effect than the components of the embodiment 1 and the embodiment 2, the difference is that the reticular pit of the glass fiber reinforced plastic prepared by the comparative example 3 is not as deep as the components of the embodiment 1 and the embodiment 2, which shows that the triethanolamine forms a stable and compact reticular structure with the pre-modified polyurethane resin under the action of the sodium alkyl benzene sulfonate aqueous solution, and forms a crossed reticular system with the polyvinyl chloride network, the mechanical property of the glass fiber reinforced plastic is greatly increased, and the reticular structure on the surface can be highlighted to be a three-dimensional structure under the action of surface tension, so that the sound absorption effect of the glass fiber reinforced plastic is greatly increased, effectively preventing the phenomenon of disturbing residents due to overlarge sound.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.