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A preparation method of low temperature resistant and high temperature resistant sizing paper for hydroelectric generator

A prepreg and insulating paper technology, applied in papermaking, paper coating, physical treatment of paper, etc., can solve the problems of limited temperature resistance, short storage of prepreg, low temperature resistance, high temperature difference, etc., and achieve long storage period Effect

Active Publication Date: 2021-08-31
SUI ON LAMINATION MATERIALS SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The insulating materials currently used in the market include glued kraft paper, glued DMD (a polyester film polyester fiber non-woven soft composite material), glued polyester film, etc. The preparation method is to pass the insulating material through a certain After the epoxy resin is glued, it forms a uniform and regular insulating glue material, but the temperature resistance of this material is limited, basically at the F level, and the moisture resistance, low temperature resistance, and high temperature resistance are poor, and the storage of prepreg is relatively short.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] In the second aspect, the embodiment of the present invention also provides a method for preparing the above-mentioned epoxy resin for prepreg and sealed polyurethane composition, comprising the following steps:

[0045] (a) mix the mass ratio of the sealing polyurethane and the epoxy resin in a ratio of 1 to 2:10; then mix it with the first solvent in a mass ratio of 1:1 to 3 to form component A;

[0046](b) Stir the latent curing agent and the second solvent according to a mass ratio of 1:2 to 7, and then add an accelerator to form component B;

[0047] (c) Mix component A and component B uniformly according to the mass ratio of 100:3-18, and then dilute with a third type of solvent to obtain an epoxy resin for prepreg and a closed polyurethane composition, wherein the first The mass ratio of the three types of solvents to the component A is 6-13:100.

[0048] Optionally, after component A, component B and the third type of solvent are uniformly mixed at 20-30°C and ...

Embodiment 1

[0066] (a) Mix liquid bisphenol F (epoxy equivalent = 160-185) epoxy resin and solid bisphenol A epoxy resin (epoxy equivalent = 800-1200) according to the mass fraction ratio of 2:48, and then add 7 parts of blocked polyurethane are dissolved by adding 50 parts of mass ethyl acetate to form component A;

[0067] (b) Stir the latent curing agent—dicyandiamide and the polar solvent N,N-dimethylformamide according to the mass ratio of 1:3.7, and then add the accelerator N-acetylimidazole. The amount of the accelerator is 13% (mass parts) of dicyandiamide forms B component;

[0068] (c) Mix component A, component B, and acetone at a mass ratio of 100:6.5:12 at 28°C, and stir for 27 minutes. The viscosity of the obtained epoxy resin and closed polyurethane composition for prepreg is 355mPa ﹒ s, the viscosity is suitable for the transfer of the sizing wire bar scraper.

Embodiment 2

[0070] Put the epoxy resin for prepreg prepared in Example 2 and the closed polyurethane composition into the glue groove, and use two sizing wire bar scrapers to rotate in the glue groove, wherein, the diameter of the sizing wire rod scraper wire rod is It is 0.7mm.

[0071] During the rotation process, the diameter of the wire rod of the sizing wire rod scraper will be filled with prepreg epoxy resin and closed polyurethane composition. When the insulating paper passes through the sizing wire rod scraper, the prepreg epoxy in the wire rod diameter will The resin and the closed polyurethane composition will be transferred to the surface of the insulating paper, and after the surface of the insulating paper is dried and cooled, it is rolled to obtain a low-temperature-resistant and high-temperature-resistant sizing paper for a hydroelectric generator.

[0072] In this embodiment, the drying process is that after the first sizing on one side of the insulating paper, after the f...

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Abstract

The embodiment of the invention discloses a method for preparing a low-temperature-resistant and high-temperature-resistant gluing insulating paper for a hydroelectric generator. An epoxy resin and closed polyurethane composition for prepreg, the raw materials for its preparation include: epoxy resin, closed polyurethane, latent curing agent, accelerator and solvent; wherein, the solvent includes the first type solvent, the second type The second type of solvent and the third type of solvent, the first type of solvent is one or more selected from acetone, ethyl acetate, methyl acetate, butanone, toluene, xylene, the second type of solvent is N,N- Dimethylformamide, the third type of solvent is one or more selected from acetone, ethyl acetate, methyl acetate, butanone, toluene, and xylene. Through the above method, the epoxy resin and polyurethane composition for prepreg of the embodiment of the present invention is suitable for the transfer of the sizing wire bar scraper, and the storage period at room temperature is longer.

Description

technical field [0001] The embodiments of the present invention relate to the field of electrical insulation materials, in particular to epoxy resins for prepregs, closed polyurethane compositions, and a method for preparing low-temperature-resistant and high-temperature-resistant sizing paper for hydroelectric generator motors. Background technique [0002] Epoxy resin has good physical and chemical properties. It has excellent bonding strength to the surface of metal and non-metal materials, good dielectric properties, small deformation shrinkage, good dimensional stability, and good flexibility. The solvent is stable, so it is widely used in bonding materials, electronic materials, composite materials and other fields, and polyurethane has excellent bonding performance at low temperature, so polyurethane compound epoxy resin can be well used in hydroelectric bonding materials. industry equipment. [0003] The insulating materials currently used in the market include glue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/24D21H19/14D21H23/34D21H25/06D21H15/10D21H21/14
CPCD21H15/10D21H19/14D21H19/24D21H21/14D21H23/34D21H25/06
Inventor 陈明义段红军彭涛陈刚郭传鸿
Owner SUI ON LAMINATION MATERIALS SHENZHEN
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