Epoxy phenolic glass cloth for brush holder on generator shaft grounding device and manufacturing method
1. The epoxy phenolic glass cloth for the brush holder on the generator shaft grounding device is characterized by comprising the following raw materials in parts by weight:
40-60 parts of alkali-free glass cloth, 20-30 parts of epoxy resin, 15-20 parts of phenolic resin, 10-15 parts of tackifying resin, 5-8 parts of dicyandiamide, 3-5 parts of dimethyl imidazole, 3-8 parts of aromatic amine curing agent, 30-40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1-3 parts of antioxidant, 2-6 parts of diisocyanate, 10-16 parts of dimethylformamide and 7-15 parts of barium sulfate.
2. The epoxy novolac glass cloth for the upper brush holder of the generator shaft grounding device according to claim 1, wherein the epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, thermoplastic novolac epoxy resin, polyphenol type glycidyl ether epoxy resin, o-cresol novolac epoxy resin, aliphatic glycidyl ether epoxy resin and glycidyl ester type epoxy resin.
3. The epoxy phenolic glass cloth for the brush holder on the generator shaft grounding device according to claim 1, wherein the phenolic resin is one or more of thermoplastic phenol formaldehyde resin, thermosetting phenol formaldehyde resin, thermoplastic o-cresol formaldehyde resin, thermosetting o-cresol formaldehyde resin, thermoplastic bisphenol A formaldehyde resin and thermosetting bisphenol A formaldehyde resin.
4. The epoxy phenolic glass cloth for the brush holder on the generator shaft receiving ground device as claimed in claim 1, wherein the tackifying resin is one of rosin resin, C5 petroleum resin, aromatic hydrocarbon resin, terpene resin, dicyclopentadiene petroleum resin, alkyl phenolic resin or xylene resin.
5. The epoxy novolac glass cloth for upper brush holder of generator shaft grounding device of claim 1, wherein the aromatic amine curing agent is 4, 4 ' -diaminodiphenylmethane, N ' -diethyl-4, 4 ' -diaminodiphenylmethane, 4 ' -diaminodiphenyl ether, 4 ' -diaminodiphenylsulfone, 3 ' -dimethyl-4, 4 ' -diaminodiphenylmethane, 1, 3-bis (3-aminophenoxy) benzene, 1, 3-bis (4-aminophenoxy) benzene, 1, 4-bis (4-aminophenoxy) benzene, 4 ' -bis (3-aminophenoxy) diphenylsulfone, 4 ' -bis (4-aminophenoxy) diphenylsulfone, or mixtures thereof, 4, 4 '-bis (3-aminophenoxy) benzophenone, 4' -bis (4-aminophenoxy) benzophenone, 4 '-bis (3-aminophenoxy) diphenyl sulfide, 4' -bis (4-aminophenoxy) diphenyl sulfide, 4 '-bis (3-aminophenoxy) biphenyl, 4' -bis (4-aminophenoxy) -3, 3 ', 5, 5' -tetramethylbiphenyl, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (3-aminophenoxy) phenyl ] propane, 2-bis (4-hydroxy-3-aminophenyl) propane, 4, 4 '-dihydroxy-3, 3' -diaminobiphenyl, m-phenylenediamine, p-phenylenediamine, 3, 5-diaminobenzoic acid and/or 3, 5-bis (4-aminophenoxy) benzoic acid.
6. The epoxy phenolic glass cloth for the upper brush holder of the generator shaft bearing ground device of claim 1, wherein the halogen-free phosphorus-containing nitrogen-containing flame retardant is prepared from 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and bismaleimide.
7. The epoxy novolac glass cloth for brush holder on a generator shaft ground receiving device of claim 1, wherein the antioxidant is one of 2, 6 di-tert-butyl-p-cresol, 1, 3 tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1, 3, 5 trimethyl 2, 4, 6 tris (3, 5 di-tert-butyl-4-hydroxybenzyl) benzene, 2 '-methylenebis (4-ethyl-6-tert-butylphenol), N' -hexamethylenebis-3 (3, 5 di-tert-butyl-4-hydroxyphenyl) propionamide, or 1, 3, 5-tris (3, 5 di-tert-butyl-4-hydroxyphenyl) isocyanate.
8. The epoxy novolac glass cloth for brush holder on generator shaft receiving ground device of claim 1, wherein the diisocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, naphthalene diisocyanate, methylcyclohexyl diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate.
9. The method for manufacturing the epoxy phenolic glass cloth for the brush holder on the generator shaft grounding device is characterized by comprising the following steps of:
selecting 40-60 parts of alkali-free glass cloth, 20-30 parts of epoxy resin, 15-20 parts of phenolic resin, 10-15 parts of tackifying resin, 5-8 parts of dicyandiamide, 3-5 parts of dimethyl imidazole, 3-8 parts of aromatic amine curing agent, 30-40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1-3 parts of antioxidant, 2-6 parts of diisocyanate, 10-16 parts of dimethylformamide and 7-15 parts of barium sulfate according to the parts by mass;
mixing a coupling agent and water in a weight ratio of 1: 9-10, stirring and dissolving at room temperature, soaking the alkali-free glass cloth with a coupling agent, and drying to obtain the treated alkali-free glass cloth;
adding dicyandiamide and dimethyl imidazole into a reaction kettle, adding a proper amount of organic solvent, fully stirring for 2-4 hours, adding epoxy resin, phenolic resin, tackifying resin, aromatic amine curing agent and halogen-free phosphorus-containing nitrogen-containing flame retardant into the reaction kettle, and stirring and dissolving for 3-5 hours at 120-130 ℃ to obtain a first-time mixture;
sequentially adding an antioxidant, diisocyanate, dimethylformamide and barium sulfate into the first mixture, heating to 80 ℃ for reaction, and gelatinizing at 160 ℃ for 100-120 s to obtain homogeneous matrix resin;
loading the treated alkali-free glass cloth into a glue dipping machine, loading the obtained matrix resin into a glue tank, starting up, dipping, and carrying out semi-curing reaction for 10 minutes at 80-160 ℃ to obtain a prepreg;
and (3) laminating and molding the prepregs, pushing the prepregs into a hot press, heating to 120-180 ℃, pressurizing to 15-20 MPa, carrying out curing reaction for 4-8 hours, keeping the pressure, naturally cooling to room temperature, and opening the mold to obtain the epoxy phenolic aldehyde glass cloth laminated board.
10. The method for manufacturing the epoxy novolac glass cloth for the upper brush holder of the generator shaft grounding device according to claim 9, wherein the coupling agent is a silane coupling agent selected from one or more of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, glycidoxy trimethoxysilane and glycidoxy triethoxysilane.
Background
And the RAM electric generator set of the nuclear power station provides a stable power supply for the control rod driving mechanism of the nuclear power station. Under the condition that a motor side input power supply is interrupted or failed for a short time, each motor generator set is designed with a flywheel which prevents output voltage and frequency from excessively decreasing when a fault occurs, and the flywheel can autonomously provide power supply with the duration time of up to 1.2s for the control rod driving mechanism. The control rod driving mechanism is powered by only the motor generator set. Normally, two generator sets run in parallel, but when one of the generator sets fails or is stopped for maintenance, the other generator set can independently supply power to the whole mechanism, and the driving mechanism stops running due to the fact that the two generator sets stop running.
The RAM generator can build the voltage to ground under a specific condition (when the static charge is enough) due to the existence of the resistance of the rotor to the ground, when the voltage rises to a certain value, the current can be conducted and broken in the area with the minimum resistance, electric spark discharge occurs, an oil film established in the operation of the bearing can be damaged in the discharge process, and a fine electric corrosion pit is formed on the surface of the metal.
When the number of pits increases, the metal surface becomes rough and glossy, and the molten metal particles enter the inside of the bearing, thereby degrading the lubricating performance of the bearing, accelerating the progress of the electric corrosion of the bearing, and damaging the metal parts such as the bearing retainer. Due to the action of shaft current corrosion, more and more pits appear in babbit metal on the surface of the bearing, so that the original operation state is changed, the unstable operation and vibration increase of the rotor are caused, electric spark discharge is aggravated, and finally the bearing retainer of the driving end is fractured under the mutual influence.
At present, a large-shaft grounding brush yoke is designed at the driving end of a generator, epoxy phenolic glass cloth is arranged on the brush yoke, and the existing epoxy phenolic glass cloth is poor in insulating property and cannot effectively block shaft current.
Disclosure of Invention
In view of the above, it is necessary to provide an epoxy novolac glass cloth for a brush holder on a generator shaft bearing device and a manufacturing method thereof, aiming at the problems that the existing epoxy novolac glass cloth has poor insulating property and cannot effectively block shaft current.
The invention provides epoxy phenolic glass cloth for a brush holder on a generator shaft ground receiving device, which comprises the following raw materials in parts by weight:
40-60 parts of alkali-free glass cloth, 20-30 parts of epoxy resin, 15-20 parts of phenolic resin, 10-15 parts of tackifying resin, 5-8 parts of dicyandiamide, 3-5 parts of dimethyl imidazole, 3-8 parts of aromatic amine curing agent, 30-40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1-3 parts of antioxidant, 2-6 parts of diisocyanate, 10-16 parts of dimethylformamide and 7-15 parts of barium sulfate.
In one embodiment, the epoxy resin is one or more of bisphenol a epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, thermoplastic novolac epoxy resin, polyphenol type glycidyl ether epoxy resin, o-cresol novolac epoxy resin, aliphatic glycidyl ether epoxy resin and glycidyl ester type epoxy resin.
In one embodiment, the phenolic resin is one or more of a thermoplastic phenol-formaldehyde resin, a thermosetting phenol-formaldehyde resin, a thermoplastic o-cresol-formaldehyde resin, a thermosetting o-cresol-formaldehyde resin, a thermoplastic bisphenol a-formaldehyde resin, and a thermosetting bisphenol a-formaldehyde resin.
In one embodiment, the tackifying resin is one of rosin resin, C5 petroleum resin, aromatic hydrocarbon resin, terpene resin, dicyclopentadiene petroleum resin, alkyl phenol resin, or xylene resin.
In one embodiment, the aromatic amine curing agent is 4, 4 ' -diaminodiphenylmethane, N ' -diethyl-4, 4 ' -diaminodiphenylmethane, 4 ' -diaminodiphenyl ether, 4 ' -diaminodiphenyl sulfone, 3 ' -dimethyl-4, 4 ' -diaminodiphenylmethane, 1, 3-bis (3-aminophenoxy) benzene, 1, 3-bis (4-aminophenoxy) benzene, 1, 4-bis (4-aminophenoxy) benzene, 4 ' -bis (3-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-aminophenoxy) diphenyl sulfone, 4 ' -bis (3-aminophenoxy) benzophenone, N ' -diethyl-4, 4 ' -diaminodiphenyl methane, 4 ' -diaminodiphenyl ether, 4 ' -diaminodiphenyl sulfone, 3 ' -bis (4-aminophenoxy) benzene, 4 ' -bis (3-aminophenoxy) diphenyl sulfone, 4 ' -bis (3-aminophenoxy) diphenyl ketone, N ' -diaminodiphenyl sulfone, 4 ' -diaminodiphenyl sulfone, 3 ' -bis (4-aminophenoxy) benzene, 3, 4 ' -bis (3-amino-phenyl) benzene, 3-bis (3-amino-phenoxy) diphenyl sulfone, 3, or a mixture thereof, 4, 4 '-bis (4-aminophenoxy) benzophenone, 4' -bis (3-aminophenoxy) diphenyl sulfide, 4 '-bis (4-aminophenoxy) diphenyl sulfide, 4' -bis (3-aminophenoxy) biphenyl, 4 '-bis (4-aminophenoxy) -3, 3', 5, 5 '-tetramethylbiphenyl, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (3-aminophenoxy) phenyl ] propane, 2-bis (4-hydroxy-3-aminophenyl) propane, 4' -dihydroxy-3, one or more of 3' -diaminobiphenyl, m-phenylenediamine, p-phenylenediamine, 3, 5-diaminobenzoic acid and 3, 5-bis (4-aminophenoxy) benzoic acid.
In one embodiment, the halogen-free phosphorus-containing nitrogen-containing flame retardant is prepared from 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and bismaleimide.
In one embodiment, the antioxidant is one of 2, 6 di-tert-butyl-p-cresol, 1, 3 tris (2-methyl-4 hydroxy-5-tert-butylphenyl) butane, 1, 3, 5 trimethyl 2, 4, 6 tris (3, 5 di-tert-butyl-4-hydroxybenzyl) benzene, 2 '-methylenebis (4-ethyl-6-tert-butylphenol), N' -hexamethylenebis-3 (3, 5 di-tert-butyl-4-hydroxyphenyl) propionamide, or 1, 3, 5-tris (3, 5 di-tert-butyl-4-hydroxyphenyl) isocyanate.
In one embodiment, the diisocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, naphthalene diisocyanate, methylcyclohexyl diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
The invention also provides a manufacturing method of the epoxy phenolic glass cloth for the brush holder on the generator shaft grounding device, which comprises the following steps:
selecting 40-60 parts of alkali-free glass cloth, 20-30 parts of epoxy resin, 15-20 parts of phenolic resin, 10-15 parts of tackifying resin, 5-8 parts of dicyandiamide, 3-5 parts of dimethyl imidazole, 3-8 parts of aromatic amine curing agent, 30-40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1-3 parts of antioxidant, 2-6 parts of diisocyanate, 10-16 parts of dimethylformamide and 7-15 parts of barium sulfate according to the parts by mass;
mixing a coupling agent and water in a weight ratio of 1: 9-10, stirring and dissolving at room temperature, soaking the alkali-free glass cloth with a coupling agent, and drying to obtain the treated alkali-free glass cloth;
adding dicyandiamide and dimethyl imidazole into a reaction kettle, adding a proper amount of organic solvent, fully stirring for 2-4 hours, adding epoxy resin, phenolic resin, tackifying resin, aromatic amine curing agent and halogen-free phosphorus-containing nitrogen-containing flame retardant into the reaction kettle, and stirring and dissolving for 3-5 hours at 120-130 ℃ to obtain a first-time mixture;
sequentially adding an antioxidant, diisocyanate, dimethylformamide and barium sulfate into the first mixture, heating to 80 ℃ for reaction, and gelatinizing at 160 ℃ for 100-120 s to obtain homogeneous matrix resin;
loading the treated alkali-free glass cloth into a glue dipping machine, loading the obtained matrix resin into a glue tank, starting up, dipping, and carrying out semi-curing reaction for 10 minutes at 80-160 ℃ to obtain a prepreg;
and (3) laminating and molding the prepregs, pushing the prepregs into a hot press, heating to 120-180 ℃, pressurizing to 15-20 MPa, carrying out curing reaction for 4-8 hours, keeping the pressure, naturally cooling to room temperature, and opening the mold to obtain the epoxy phenolic aldehyde glass cloth laminated board.
In one embodiment, the coupling agent is a silane coupling agent selected from one or more of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, glycidyltrimethoxysilane and glycidyltriethoxysilane.
The beneficial effects of the invention include:
the epoxy phenolic glass cloth provided by the invention has good dielectric property, and epoxy resin, phenolic resin, tackifying resin, dicyandiamide, dimethyl imidazole, aromatic amine curing agent, halogen-free phosphorus-containing nitrogen-containing flame retardant, antioxidant, diisocyanate, dimethylformamide and barium sulfate are mixed according to a certain proportion, so that the thermal stability of a prepreg is effectively enhanced, and the insulating property of the epoxy phenolic glass cloth is improved.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
In one embodiment of the invention, the epoxy phenolic glass cloth for the brush holder on the generator shaft bearing device comprises the following raw materials in parts by weight: 40-60 parts of alkali-free glass cloth, 20-30 parts of epoxy resin, 15-20 parts of phenolic resin, 10-15 parts of tackifying resin, 5-8 parts of dicyandiamide, 3-5 parts of dimethyl imidazole, 3-8 parts of aromatic amine curing agent, 30-40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1-3 parts of antioxidant, 2-6 parts of diisocyanate, 10-16 parts of dimethylformamide and 7-15 parts of barium sulfate.
In some embodiments, the epoxy resin in the present application is one or more of bisphenol a epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, thermoplastic novolac epoxy resin, polyphenol type glycidyl ether epoxy resin, o-cresol novolac epoxy resin, aliphatic glycidyl ether epoxy resin, and glycidyl ester type epoxy resin.
In some embodiments, the phenolic resin herein is one or more of a thermoplastic phenol-formaldehyde resin, a thermosetting phenol-formaldehyde resin, a thermoplastic o-cresol-formaldehyde resin, a thermosetting o-cresol-formaldehyde resin, a thermoplastic bisphenol a-formaldehyde resin, a thermosetting bisphenol a-formaldehyde resin.
In some embodiments, the tackifying resin herein is one of a rosin resin, a C5 petroleum resin, an aromatic hydrocarbon resin, a terpene resin, a dicyclopentadiene petroleum resin, an alkyl phenol resin, or a xylene resin.
In some embodiments, the aromatic amine curing agent herein is 4, 4 '-diaminodiphenylmethane, N' -diethyl-4, 4 '-diaminodiphenylmethane, 4' -diaminodiphenyl ether, 4 '-diaminodiphenyl sulfone, 3' -dimethyl-4, 4 '-diaminodiphenylmethane, 1, 3-bis (3-aminophenoxy) benzene, 1, 3-bis (4-aminophenoxy) benzene, 1, 4-bis (4-aminophenoxy) benzene, 4' -bis (3-aminophenoxy) diphenyl sulfone, 4 '-bis (4-aminophenoxy) diphenyl sulfone, 4' -bis (3-aminophenoxy) benzophenone, an aromatic amine curing agent, a silicone oil, and a silicone oil, a silicone, 4, 4 '-bis (4-aminophenoxy) benzophenone, 4' -bis (3-aminophenoxy) diphenyl sulfide, 4 '-bis (4-aminophenoxy) diphenyl sulfide, 4' -bis (3-aminophenoxy) biphenyl, 4 '-bis (4-aminophenoxy) -3, 3', 5, 5 '-tetramethylbiphenyl, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (3-aminophenoxy) phenyl ] propane, 2-bis (4-hydroxy-3-aminophenyl) propane, 4' -dihydroxy-3, one or more of 3' -diaminobiphenyl, m-phenylenediamine, p-phenylenediamine, 3, 5-diaminobenzoic acid and 3, 5-bis (4-aminophenoxy) benzoic acid.
In some embodiments, the halogen-free, phosphorus-containing, nitrogen-containing flame retardants herein are prepared from 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and bismaleimide.
In some embodiments, the antioxidant herein is one of 2, 6 di-tert-butyl-p-cresol, 1, 3 tris (2-methyl-4 hydroxy-5 tert-butylphenyl) butane, 1, 3, 5 trimethyl 2, 4, 6 tris (3, 5 di-tert-butyl-4 hydroxybenzyl) benzene, 2 '-methylenebis (4-ethyl-6 tert-butylphenol), N' -hexamethylenebis-3 (3, 5 di-tert-butyl-4 hydroxyphenyl) propionamide, or 1, 3, 5-tris (3, 5 di-tert-butyl-4-hydroxyphenyl) isocyanate.
In some embodiments, the diisocyanate herein is one or more of toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, naphthalene diisocyanate, methylcyclohexyl diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate.
The invention also provides a manufacturing method of the epoxy phenolic glass cloth for the brush holder on the generator shaft grounding device, which comprises the following steps:
step 110: selecting 40-60 parts of alkali-free glass cloth, 20-30 parts of epoxy resin, 15-20 parts of phenolic resin, 10-15 parts of tackifying resin, 5-8 parts of dicyandiamide, 3-5 parts of dimethyl imidazole, 3-8 parts of aromatic amine curing agent, 30-40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1-3 parts of antioxidant, 2-6 parts of diisocyanate, 10-16 parts of dimethylformamide and 7-15 parts of barium sulfate according to the parts by mass;
step 120: mixing a coupling agent and water in a weight ratio of 1: 9-10, stirring and dissolving at room temperature, soaking the alkali-free glass cloth with a coupling agent, and drying to obtain the treated alkali-free glass cloth;
step 130: adding dicyandiamide and dimethyl imidazole into a reaction kettle, adding a proper amount of organic solvent, fully stirring for 2-4 hours, adding epoxy resin, phenolic resin, tackifying resin, aromatic amine curing agent and halogen-free phosphorus-containing nitrogen-containing flame retardant into the reaction kettle, and stirring and dissolving for 3-5 hours at 120-130 ℃ to obtain a first-time mixture;
step 140: sequentially adding an antioxidant, diisocyanate, dimethylformamide and barium sulfate into the first mixture, heating to 80 ℃ for reaction, and gelatinizing at 160 ℃ for 100-120 s to obtain homogeneous matrix resin;
step 150: loading the treated alkali-free glass cloth into a glue dipping machine, loading the obtained matrix resin into a glue tank, starting up, dipping, and carrying out semi-curing reaction for 10 minutes at 80-160 ℃ to obtain a prepreg;
step 160: and (3) laminating and molding the prepregs, pushing the prepregs into a hot press, heating to 120-180 ℃, pressurizing to 15-20 MPa, carrying out curing reaction for 4-8 hours, keeping the pressure, naturally cooling to room temperature, and opening the mold to obtain the epoxy phenolic aldehyde glass cloth laminated board.
Example 1:
an epoxy phenolic glass cloth for a brush holder on a generator shaft ground receiving device comprises the following raw materials in parts by weight: 40 parts of alkali-free glass cloth, 20 parts of epoxy resin, 15 parts of phenolic resin, 10 parts of tackifying resin, 5 parts of dicyandiamide, 3 parts of dimethyl imidazole, 3 parts of aromatic amine curing agent, 30 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1 part of antioxidant, 2 parts of diisocyanate, 10 parts of dimethylformamide and 7 parts of barium sulfate.
The manufacturing method of the epoxy phenolic glass cloth comprises the following steps:
step 110: selecting 40 parts of alkali-free glass cloth, 20 parts of epoxy resin, 15 parts of phenolic resin, 10 parts of tackifying resin, 5 parts of dicyandiamide, 3 parts of dimethyl imidazole, 3 parts of aromatic amine curing agent, 30 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 1 part of antioxidant, 2 parts of diisocyanate, 10 parts of dimethyl formamide and 7 parts of barium sulfate according to the parts by mass;
step 120: mixing a coupling agent and water in a weight ratio of 1: 9-10, stirring and dissolving at room temperature, soaking the alkali-free glass cloth with a coupling agent, and drying to obtain the treated alkali-free glass cloth;
step 130: adding dicyandiamide and dimethyl imidazole into a reaction kettle, adding a proper amount of organic solvent, fully stirring for 2-4 hours, adding epoxy resin, phenolic resin, tackifying resin, aromatic amine curing agent and halogen-free phosphorus-containing nitrogen-containing flame retardant into the reaction kettle, and stirring and dissolving for 3-5 hours at 120-130 ℃ to obtain a first-time mixture;
step 140: sequentially adding an antioxidant, diisocyanate, dimethylformamide and barium sulfate into the first mixture, heating to 80 ℃ for reaction, and gelatinizing at 160 ℃ for 100-120 s to obtain homogeneous matrix resin;
step 150: loading the treated alkali-free glass cloth into a glue dipping machine, loading the obtained matrix resin into a glue tank, starting up, dipping, and carrying out semi-curing reaction for 10 minutes at 80-160 ℃ to obtain a prepreg;
step 160: and (3) laminating and molding the prepregs, pushing the prepregs into a hot press, heating to 120-180 ℃, pressurizing to 15-20 MPa, carrying out curing reaction for 4-8 hours, keeping the pressure, naturally cooling to room temperature, and opening the mold to obtain the epoxy phenolic aldehyde glass cloth laminated board.
Example 2
An epoxy phenolic glass cloth for a brush holder on a generator shaft ground receiving device comprises the following raw materials in parts by weight: 60 parts of alkali-free glass cloth, 30 parts of epoxy resin, 20 parts of phenolic resin, 15 parts of tackifying resin, 8 parts of dicyandiamide, 5 parts of dimethyl imidazole, 8 parts of aromatic amine curing agent, 40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 3 parts of antioxidant, 6 parts of diisocyanate, 16 parts of dimethylformamide and 15 parts of barium sulfate.
The manufacturing method of the epoxy phenolic glass cloth comprises the following steps:
step 110: selecting 60 parts of alkali-free glass cloth, 30 parts of epoxy resin, 20 parts of phenolic resin, 15 parts of tackifying resin, 8 parts of dicyandiamide, 5 parts of dimethyl imidazole, 8 parts of aromatic amine curing agent, 40 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 3 parts of antioxidant, 6 parts of diisocyanate, 16 parts of dimethyl formamide and 15 parts of barium sulfate according to the parts by mass;
step 120: mixing a coupling agent and water in a weight ratio of 1: 9-10, stirring and dissolving at room temperature, soaking the alkali-free glass cloth with a coupling agent, and drying to obtain the treated alkali-free glass cloth;
step 130: adding dicyandiamide and dimethyl imidazole into a reaction kettle, adding a proper amount of organic solvent, fully stirring for 2-4 hours, adding epoxy resin, phenolic resin, tackifying resin, aromatic amine curing agent and halogen-free phosphorus-containing nitrogen-containing flame retardant into the reaction kettle, and stirring and dissolving for 3-5 hours at 120-130 ℃ to obtain a first-time mixture;
step 140: sequentially adding an antioxidant, diisocyanate, dimethylformamide and barium sulfate into the first mixture, heating to 80 ℃ for reaction, and gelatinizing at 160 ℃ for 100-120 s to obtain homogeneous matrix resin;
step 150: loading the treated alkali-free glass cloth into a glue dipping machine, loading the obtained matrix resin into a glue tank, starting up, dipping, and carrying out semi-curing reaction for 10 minutes at 80-160 ℃ to obtain a prepreg;
step 160: and (3) laminating and molding the prepregs, pushing the prepregs into a hot press, heating to 120-180 ℃, pressurizing to 15-20 MPa, carrying out curing reaction for 4-8 hours, keeping the pressure, naturally cooling to room temperature, and opening the mold to obtain the epoxy phenolic aldehyde glass cloth laminated board.
Example 3
An epoxy phenolic glass cloth for a brush holder on a generator shaft ground receiving device comprises the following raw materials in parts by weight: 50 parts of alkali-free glass cloth, 25 parts of epoxy resin, 17 parts of phenolic resin, 13 parts of tackifying resin, 7 parts of dicyandiamide, 4 parts of dimethyl imidazole, 5 parts of aromatic amine curing agent, 35 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 2 parts of antioxidant, 4 parts of diisocyanate, 13 parts of dimethylformamide and 10 parts of barium sulfate.
The manufacturing method of the epoxy phenolic glass cloth comprises the following steps:
step 110: selecting 50 parts of alkali-free glass cloth, 25 parts of epoxy resin, 17 parts of phenolic resin, 13 parts of tackifying resin, 7 parts of dicyandiamide, 4 parts of dimethyl imidazole, 5 parts of aromatic amine curing agent, 35 parts of halogen-free phosphorus-containing nitrogen-containing flame retardant, 2 parts of antioxidant, 4 parts of diisocyanate, 13 parts of dimethyl formamide and 10 parts of barium sulfate according to the parts by mass;
step 120: mixing a coupling agent and water in a weight ratio of 1: 9-10, stirring and dissolving at room temperature, soaking the alkali-free glass cloth with a coupling agent, and drying to obtain the treated alkali-free glass cloth;
step 130: adding dicyandiamide and dimethyl imidazole into a reaction kettle, adding a proper amount of organic solvent, fully stirring for 2-4 hours, adding epoxy resin, phenolic resin, tackifying resin, aromatic amine curing agent and halogen-free phosphorus-containing nitrogen-containing flame retardant into the reaction kettle, and stirring and dissolving for 3-5 hours at 120-130 ℃ to obtain a first-time mixture;
step 140: sequentially adding an antioxidant, diisocyanate, dimethylformamide and barium sulfate into the first mixture, heating to 80 ℃ for reaction, and gelatinizing at 160 ℃ for 100-120 s to obtain homogeneous matrix resin;
step 150: loading the treated alkali-free glass cloth into a glue dipping machine, loading the obtained matrix resin into a glue tank, starting up, dipping, and carrying out semi-curing reaction for 10 minutes at 80-160 ℃ to obtain a prepreg;
step 160: and (3) laminating and molding the prepregs, pushing the prepregs into a hot press, heating to 120-180 ℃, pressurizing to 15-20 MPa, carrying out curing reaction for 4-8 hours, keeping the pressure, naturally cooling to room temperature, and opening the mold to obtain the epoxy phenolic aldehyde glass cloth laminated board.
The epoxy phenolic glass cloth laminated boards 1-3 prepared in the above embodiments are added in different amounts respectively to prepare samples, and then comparison evaluation analysis is performed, and effect monitoring is performed on four indexes of specific gravity, insulation resistance omega, withstand voltage and electric breakdown in the epoxy phenolic glass cloth laminated board under the same conditions; the monitoring results are shown in table 1 below:
table 1 evaluation results of samples prepared from different parts by weight of materials used for epoxy novolac glass cloth laminates 1-3 under the same conditions are shown.
Item
Specific gravity of
Insulation resistance omega
Voltage withstanding kV
Electric breakdown kV
Example 1
1.89
2.7×1013
43
50 do not hitWearing device
Example 2
1.86
5.8×1013
43
50 do not break down
Example 3
1.84
6.5×1013
43
50 do not break down
In summary, the best solution of example 3 is shown in table 1, based on the differences in the mass parts of the alkali-free glass cloth, the epoxy resin, the phenolic resin, the tackifying resin, the dicyandiamide, the dimethylimidazole, the aromatic amine curing agent, the halogen-free, phosphorus-containing, nitrogen-containing flame retardant, the antioxidant, the diisocyanate, the dimethylformamide, and the barium sulfate in examples 1 to 3.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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