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A kind of insulating varnish and preparation method thereof

A technology of insulating varnish and formula, which is applied in the direction of insulators, coatings, polyurea/polyurethane coatings, etc., can solve the problems that the insulating varnish needs to be improved, and achieve the effect of simple operation, mild reaction conditions and good manufacturability

Active Publication Date: 2019-05-24
SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the insulating paint still needs to be improved.

Method used

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  • A kind of insulating varnish and preparation method thereof
  • A kind of insulating varnish and preparation method thereof
  • A kind of insulating varnish and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the reactor, add 87g (0.77mol) of ε-caprolactam and 0.5g of dibutyltin dilaurate, start stirring, raise the temperature to 70°C, and dissolve 80g of methylene diphenyl diisocyanate (0.64mol of isocyanate) Add 120mL of toluene dropwise into the reactor, and keep at this temperature for 4h to end the reaction, add petroleum ether after cooling, filter with suction, and dry the filter cake in a vacuum oven at 65°C to obtain ε-caprolactam blocked di Isocyanate (blocked MDI).

Embodiment 2

[0050] In the reactor, add 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexyl carboxylate 100g (0.8mol epoxy group), 2-ethyl-4-methylimidazole 0.5g, Start stirring, heat up to 160 ° C, add 95 g of the blocked MDI (0.40 mol of isocyanate) prepared in Example 1 at one time, and keep it warm at this temperature for 4 hours to complete the reaction and obtain polyoxazolidinone resin. The measured viscosity at 25°C is 1250cps, and its infrared spectrum can be found in figure 1 ,From figure 1 Known: 2900cm -1 The nearby peak is the characteristic peak of C-H stretching vibration, 1614cm -1 and 1514cm -1 It is the characteristic peak of the vibration of the benzene ring skeleton, 1728cm -1 It is the stretching vibration peak of the carbonyl group connected to the alicyclic ring, 1761cm -1 The nearby shoulder is the stretching vibration peak of the carbonyl group on the oxazolidinone ring, 901cm -1 It is the symmetrical stretching vibration peak of epoxy ether bond C-O-C, 2267cm -1 Ne...

Embodiment 3

[0052] In the reactor, add 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexyl carboxylate 100g (0.80mol epoxy group), 2-ethyl-4-methylimidazole 0.5g, Start stirring, heat up to 150°C, add 95g of the blocked MDI (0.40mol of isocyanate) prepared in Example 1 at one time, and keep it warm at this temperature for 4h, and end the reaction to obtain polyoxazolidinone resin. The measured viscosity at 25°C was 1120 cps.

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Abstract

The invention relates to an insulation varnish and a preparing method thereof. The insulation varnish is prepared from, by weight, 100 parts of polyoxazolidone resin, 20-40 parts of bisphenol F epikote, 25-45 parts of acrylate epikote, 15-25 parts of reactive diluent, 2-8 parts of curing agent, 0.5-1 part of initiator and 0.5-1 part of polymerization inhibitor. The viscosity of polyoxazolidone resin is 1000-3000 cps at 25 DEG C. According to the insulation varnish and the preparing method thereof, the insulation varnish adopts polyoxazolidone resin as a main body, and is used in company with acrylate epikote and bisphenol F epikote. Accordingly the insulation varnish has the advantages of being heat resistant, flame retardant, environmentally friendly and the like, and is applicable to insulation processing of high and low voltage motors.

Description

technical field [0001] The invention relates to an insulating varnish and a preparation method thereof. Background technique [0002] After the insulation impregnation treatment of the motor winding, it can improve the operation safety of the inner winding of the motor, improve its insulation performance and mechanical strength, avoid partial discharge in the internal air gap, enhance the operation reliability, improve the ability of moisture resistance and salt spray resistance, and prolong the service life. Nowadays, domestic motor manufacturers generally use vacuum pressure impregnation (VPI) technology to insulate motors, transformers and other electrical appliances. Therefore, the demand for VPI solvent-free insulating varnishes in the market is increasing day by day. [0003] In recent years, polyoxazolidinone resins have shown excellent properties in terms of high temperature resistance, chemical corrosion resistance, and flame retardancy, and have been used in many f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D163/10C09D163/00C09D5/18C09D5/25C08G18/80C08G18/58
CPCC08G18/58C08G18/8074C08L2201/02C08L2201/08C08L2205/02C08L2205/03C09D5/18C09D175/04H01B3/302C08L63/00C08L63/10
Inventor 吴斌井丰喜夏智峰夏媛娇张春琪单升升
Owner SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD