1. The room temperature curing glass fiber weftless binding tape special for kerosene vapor drying is characterized by comprising the following components in parts by weight:

100 parts of epoxy resin, 12-15 parts of liquid nitrile rubber, 20-25 parts of polyvinyl formal, 40-50 parts of acetone, 10-15 parts of alumina powder, 1-2 parts of nano alumina, 0.5-2 parts of light calcium carbonate, 0.5-1.5 parts of kaolin, 0.1-0.5 part of fumed silica, 1.5-3 parts of zinc stearate, 0.2-0.3 part of 2-methyl-4-ethylimidazole and 1.5-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol.

2. The room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying as claimed in claim 1, characterized in that: also comprises 3-4.5 parts of 2-methylimidazole.

3. The room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying as claimed in claim 1, characterized in that: also comprises 3-4 parts of phenolic aldehyde amine.

4. A preparation method of room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying is characterized in that: the method comprises the following steps:

s1, putting 100 parts by weight of epoxy resin, 20-25 parts by weight of polyvinyl formal, 12-15 parts by weight of liquid nitrile rubber and 12-15 parts by weight of acetone into a reaction kettle, heating to 25-50 ℃ to dissolve, and keeping the temperature for 10-20 min to obtain a mixture;

s2, adding 10-15 parts of alumina powder, 1-2 parts of nano alumina, 0.5-2 parts of light calcium carbonate, 0.5-1.5 parts of kaolin, 0.1-0.5 part of fumed silica and 1.5-3 parts of zinc stearate into the mixture, and stirring at 30-40 ℃ for 30-120 min to obtain a glue solution;

s3, cooling the glue solution to 8-10 ℃, adding 0.2-0.3 part of 2-methyl-4-ethylimidazole, 3-4 parts of phenol aldehyde amine, 1.5-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 3-4.5 parts of 2-methylimidazole, and stirring for 5-60 min to obtain the adhesive;

s4, soaking and coating the adhesive on the alkali-free glass fiber yarns at 15-20 ℃, removing part of the solvent from the alkali-free glass fiber yarns soaked with the adhesive at room temperature, and drying in the air for 10-30 s for primary shaping to obtain the weftless tape;

s5, carrying out air cooling drying on the preliminarily shaped weftless tape to remove the residual solvent;

s6, rolling and packaging the solvent-removed weftless tape, and putting the weftless tape into a freezer to obtain a finished product.

5. The preparation method of the room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying as claimed in claim 4, characterized in that: and the stirring speed of the step S2 is 40-120 r/min.

6. The preparation method of the room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying as claimed in claim 4, characterized in that: and the stirring speed of the step S3 is 40-150 r/min.

7. The preparation method of the room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying as claimed in claim 4, characterized in that: the air-cooled drying in the step S5 is carried out with the ventilation volume of 60-150 h/m³And the air cooling drying time is 120-200 s.

Background

The traditional weftless tape is a tape-shaped insulating binding material with a certain width, which is formed by impregnating high-temperature-resistant thermosetting unsaturated polyester resin with processed unidirectionally-arranged continuous twisted alkali-free glass fiber yarns.

In the 80s of 20 th century, most transformer manufacturing companies introduce a kerosene vapor phase drying process, the process is that after iron cores are bound, a transformer body is moved into a kerosene vapor phase drying furnace at the furnace temperature of 60 ℃, atomized kerosene is sprayed after 1-2h, the traditional weftless tape is not crosslinked at the moment, so that the whole resin is not resistant to kerosene elution, and after the kerosene vapor phase drying furnace is used for a long time, the resin eluted by the kerosene forms colloidal particles to cause oil circuit blockage, equipment pollution and production accidents; at present, the solutions of transformer manufacturers are to clean kerosene pipelines, valves and kerosene tanks after drying products, and to replace kerosene regularly, which is cumbersome to operate, high in labor intensity and extremely high in maintenance cost.

Disclosure of Invention

The invention aims to overcome and supplement the defects in the prior art and provide the room-temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying and the preparation method thereof. The technical scheme adopted by the invention is as follows:

the room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following components in parts by weight:

100 parts of epoxy resin, 12-15 parts of liquid nitrile rubber, 20-25 parts of polyvinyl formal, 40-50 parts of acetone, 10-15 parts of alumina powder, 1-2 parts of nano alumina, 0.5-2 parts of light calcium carbonate, 0.5-1.5 parts of kaolin, 0.1-0.5 part of fumed silica, 1.5-3 parts of zinc stearate, 0.2-0.3 part of 2-methyl-4-ethylimidazole and 1.5-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol.

Preferably, the room temperature curing glass fiber weftless binding tape special for kerosene gas phase drying is provided, wherein: also comprises 3-4.5 parts of 2-methylimidazole.

Preferably, the room temperature curing glass fiber weftless binding tape special for kerosene gas phase drying is provided, wherein: also comprises 3-4 parts of phenolic aldehyde amine.

A preparation method of room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following steps: the method comprises the following steps:

s1, putting 100 parts by weight of epoxy resin, 20-25 parts by weight of polyvinyl formal, 12-15 parts by weight of liquid nitrile rubber and 12-15 parts by weight of acetone into a reaction kettle, heating to 25-50 ℃ to dissolve, and keeping the temperature for 10-20 min to obtain a mixture;

s2, adding 10-15 parts of alumina powder, 1-2 parts of nano alumina, 0.5-2 parts of light calcium carbonate, 0.5-1.5 parts of kaolin, 0.1-0.5 part of fumed silica and 1.5-3 parts of zinc stearate into the mixture, and stirring at 30-40 ℃ for 30-120 min to obtain a glue solution;

s3, cooling the glue solution to 8-10 ℃, adding 0.2-0.3 part of 2-methyl-4-ethylimidazole, 3-4 parts of phenol aldehyde amine, 1.5-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 3-4.5 parts of 2-methylimidazole, and stirring for 5-60 min to obtain the adhesive;

s4, soaking and coating the adhesive on the alkali-free glass fiber yarns at 15-20 ℃, removing part of the solvent from the alkali-free glass fiber yarns soaked with the adhesive at room temperature, and drying in the air for 10-30 s for primary shaping to obtain the weftless tape;

s5, carrying out air cooling drying on the preliminarily shaped weftless tape to remove the residual solvent;

s6, rolling and packaging the solvent-removed weftless tape, and putting the weftless tape into a freezer to obtain a finished product.

Preferably, the preparation method of the room temperature curing glass fiber weftless binding tape special for kerosene gas phase drying comprises the following steps: and the stirring speed of the step S2 is 40-120 r/min.

Preferably, the preparation method of the room temperature curing glass fiber weftless binding tape special for kerosene gas phase drying comprises the following steps: and the stirring speed of the step S3 is 40-150 r/min.

Preferably, the preparation method of the room temperature curing glass fiber weftless binding tape special for kerosene gas phase drying comprises the following steps: the air-cooled drying in the step S5 is carried out with the ventilation volume of 60-150 h/m³And the air cooling drying time is 120-200 s.

The invention has the advantages that:

according to the room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying and the preparation method thereof, kaolin and fumed silica are added, so that an adhesive has extremely excellent thixotropy, the prepared room temperature curing weftless tape does not drip during curing, does not stick after being heated, light calcium carbonate is added into raw materials, and during the use process, no matter before and after curing, the room temperature curing weftless binding tape does not have powder falling, zinc stearate with an appropriate proportion is added, so that the prepared room temperature curing weftless binding tape has excellent uncoiling capability, and the phenomenon that the adhesive cannot be uncoiled due to bonding is avoided.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Example 1

The room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following components in parts by weight:

100 parts of epoxy resin, 13 parts of liquid nitrile rubber, 22 parts of polyvinyl formal, 40 parts of acetone, 11 parts of alumina powder, 1.1 parts of nano alumina, 1.7 parts of light calcium carbonate, 1 part of kaolin, 0.3 part of fumed silica, 3 parts of zinc stearate, 0.2 part of 2-methyl-4-ethylimidazole, 3.1 parts of phenolic amine, 1.6 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 3.5 parts of 2-methylimidazole.

A preparation method of room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following steps: the method comprises the following steps:

s1, putting 100 parts of epoxy resin, 22 parts of polyvinyl formal, 13 parts of liquid nitrile rubber and 40 parts of acetone into a reaction kettle, heating to 40 ℃ to dissolve, and keeping the temperature for 10min to obtain a mixture;

s2, adding 11 parts of alumina powder, 1.1 parts of nano alumina, 1.7 parts of light calcium carbonate, 1 part of kaolin, 0.3 part of fumed silica and 3 parts of zinc stearate into the mixture, and stirring at 40 ℃ for 75min at the rotating speed of 60 revolutions per minute to obtain a glue solution;

s3, cooling the glue solution to 10 ℃ by using a water cooling device, adding 0.2 part of 2-methyl-4-ethylimidazole, 3.1 parts of phenol aldehyde amine, 1.6 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 3.5 parts of 2-methylimidazole, stirring for 20min, and rotating at the speed of 120 r/min to obtain the adhesive;

s4, soaking and coating the adhesive on the alkali-free glass fiber yarns at 15 ℃, removing part of the solvent from the alkali-free glass fiber yarns soaked with the adhesive at room temperature, and drying in the air for 30s for primary shaping to obtain the weftless tape;

s5, carrying out air cooling drying on the preliminarily shaped weftless tape to remove residual solvent, wherein the ventilation rate is 150h/m³The air-cooled drying time was 125 s.

S6, rolling and packaging the solvent-removed weftless tape, and putting the weftless tape into a freezer to obtain a finished product.

Example 2

The room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following components in parts by weight:

100 parts of epoxy resin, 14.5 parts of liquid nitrile rubber, 25 parts of polyvinyl formal, 45 parts of acetone, 14.5 parts of alumina powder, 2 parts of nano alumina, 0.9 part of light calcium carbonate, 1.5 parts of kaolin, 0.5 part of fumed silica, 2 parts of zinc stearate, 0.2 part of 2-methyl-4-ethylimidazole, 3.0 parts of phenolic amine, 1.5 parts of 2,4, 6-tri (dimethylaminomethyl) phenol and 4.5 parts of 2-methylimidazole.

A preparation method of room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following steps: the method comprises the following steps:

s1, putting 100 parts of epoxy resin, 25 parts of polyvinyl formal, 45 parts of liquid nitrile rubber and 45 parts of acetone into a reaction kettle, heating to 40 ℃ to dissolve, and keeping the temperature for 10min to obtain a mixture;

s2, adding 14.5 parts of alumina powder, 2 parts of nano alumina, 0.9 part of light calcium carbonate, 1.5 parts of kaolin, 0.5 part of fumed silica and 2 parts of zinc stearate into the mixture, and stirring at 40 ℃ for 75min at the rotating speed of 60 revolutions per minute to obtain a glue solution;

s3, cooling the glue solution to 10 ℃ by using a water cooling device, adding 0.2 part of 2-methyl-4-ethylimidazole, 3.0 parts of phenol aldehyde amine, 1.5 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 4.5 parts of 2-methylimidazole, stirring for 20min, and rotating at the speed of 120 r/min to obtain the adhesive;

s4, soaking and coating the adhesive on the alkali-free glass fiber yarns at the temperature of 12 ℃, removing part of the solvent from the alkali-free glass fiber yarns soaked with the adhesive at room temperature, and drying in the air for 30s for primary shaping to obtain the weftless tape;

s5, carrying out air cooling drying on the preliminarily shaped weftless tape to remove residual solvent, wherein the ventilation rate is 140h/m³The air-cooling drying time is 180 s.

S6, rolling and packaging the solvent-removed weftless tape, and putting the weftless tape into a freezer to obtain a finished product.

Example 3

The room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following components in parts by weight:

100 parts of epoxy resin, 13.5 parts of liquid nitrile rubber, 20 parts of polyvinyl formal, 50 parts of acetone, 10.5 parts of alumina powder, 1.2 parts of nano alumina, 1.9 parts of light calcium carbonate, 1.3 parts of kaolin, 0.2 part of fumed silica, 1.92 parts of zinc stearate, 0.24 part of 2-methyl-4-ethylimidazole, 4.0 parts of phenol aldehyde amine, 2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 4.1 parts of 2-methylimidazole.

A preparation method of room temperature curing glass fiber weftless binding tape special for kerosene vapor drying comprises the following steps: the method comprises the following steps:

s1, putting 100 parts of epoxy resin, 20 parts of polyvinyl formal, 13.5 parts of liquid nitrile rubber and 50 parts of acetone into a reaction kettle, heating to 50 ℃ to dissolve, and keeping the temperature for 10min to obtain a mixture;

s2, adding 10.5 parts of alumina powder, 1.2 parts of nano alumina, 1.9 parts of light calcium carbonate, 1.3 parts of kaolin, 0.2 part of fumed silica and 1.92 parts of zinc stearate into the mixture, and stirring at 40 ℃ for 75min at the rotating speed of 60 revolutions per minute to obtain a glue solution;

s3, cooling the glue solution to 8 ℃ by using a water cooling device, adding 0.24 part of 2-methyl-4-ethylimidazole, 4.0 parts of phenol aldehyde amine, 2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 4.1 parts of 2-methylimidazole, stirring for 20min, and rotating at the speed of 120 r/min to obtain the adhesive;

s4, soaking the adhesive at 9 ℃ and coating the adhesive on the alkali-free glass fiber yarns, removing part of the solvent from the alkali-free glass fiber yarns soaked with the adhesive at room temperature, and drying in the air for 30s for primary shaping to obtain the weftless tape;

s5, carrying out air cooling drying on the preliminarily shaped weftless tape to remove residual solvent, wherein the ventilation rate is 150h/m³The air-cooled drying time was 200 s.

S6, rolling and packaging the solvent-removed weftless tape, and putting the weftless tape into a freezer to obtain a finished product.

The finished weftless banding strips of examples 1-3 were taken for experimental testing:

1. shearing the weftless binding tape to be 50MM × 200MM long, and observing whether powder falls off from the weftless binding tape during uncoiling in the shearing process;

2. isolating the front surface and the back surface of the weftless binding tape by using polytetrafluoroethylene films (the trade name is Teflon 0.5MM thick);

3. the prepared weftless binding tape is weighed after being solidified for 36H at room temperature, data is recorded, the weftless binding tape is put into a kerosene gas phase drying furnace for carrying out kerosene gas phase drying process, a sample piece after kerosene gas phase drying treatment is taken out and placed at room temperature, and the sample piece is cooled to the room temperature for carrying out weight loss detection;

4. winding a weftless binding tape between two metal cylinders with the diameter of 50MM and wrapped by Teflon, wherein the metal cylinders have two mounting plates with fixed distance and the center distance of 260MM, winding a single layer, preparing an oval sample piece, and standing for 24 hours;

5. placing the laid binding belt, the metal cylinder and the fixing plate into a drying box, starting the drying box to heat and raise the temperature, raising the temperature to 60 ℃, preserving the heat for 2 hours, and curing at the temperature raising rate of 5 ℃/min;

6. and taking out the cured weftless binding tape, placing the cured weftless binding tape at room temperature, and cooling the cured weftless binding tape to the room temperature for testing the tensile strength.

The detection results are shown in table 1:

TABLE 1

Remarking: according to the same detection method and the same detection instrument, the weight loss rate of a certain brand weftless binding tape sold in the market is 9.5%, the average value of the tensile strength is 862KG, and through analysis, before kerosene gas phase drying process oil injection, the traditional weftless binding tape can not be cured, so that the binding force is insufficient, and the equipment is polluted by kerosene eluting resin.

Room temperature curing characteristics of the invention: before the room-temperature-cured weftless binding tape is moved into a kerosene gas phase drying furnace, the room-temperature-cured weftless binding tape has a certain crosslinking degree, and after the room-temperature-cured weftless binding tape is placed at 60 ℃ for 2 hours, the crosslinking degree is further increased, the room-temperature-cured weftless binding tape is difficult to elute by a kerosene gas phase drying process, kerosene gas phase drying equipment is not polluted, and falling colloidal particles block an equipment oil path.

According to the room temperature curing glass fiber weftless binding tape special for kerosene vapor phase drying and the preparation method thereof, kaolin and fumed silica are added, so that an adhesive has extremely excellent thixotropy, the prepared room temperature curing weftless binding tape does not drip during curing, and does not stick after being heated, light calcium carbonate with an appropriate mark is added into raw materials, and during the use process, no matter before and after curing, the room temperature curing weftless binding tape does not have powder falling, zinc stearate with an appropriate proportion is added, so that the prepared room temperature curing weftless binding tape has excellent uncoiling capability, and the phenomenon that the adhesive cannot be uncoiled due to binding can not occur.

The room temperature curing glass fiber weftless binding tape special for kerosene gas phase drying and the preparation method thereof have white appearance, no latitude line, room temperature curing capability, higher crosslinking degree condition of 60 ℃ for 2 hours, kerosene gas phase drying process can further improve the crosslinking degree until the crosslinking degree is completely crosslinked, the kerosene gas phase drying weight loss rate is extremely low, no glue flows in the curing process, no powder falling occurs before and after curing, and the room temperature curing glass fiber weftless binding tape is applied to iron core binding of a dry type/oil immersed transformer and is used for tightening and binding an iron core column part.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.