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A kind of preparation method of alicyclic epoxy resin hyperbranched polyester toughening agent for transformer

A technology of hyperbranched polyester and epoxy resin, which is applied in the field of electrical chemical material preparation, can solve the problems of unfavorable modern production, lower production cost, and difficult control, etc., to improve comprehensive mechanical properties, improve adhesion, and increase elongation at break The effect of length

Active Publication Date: 2017-08-29
安徽互感器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is relatively complicated, difficult to control, and prone to high pollution, which is not conducive to the requirements of modern production and is not conducive to the reduction of production costs.

Method used

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  • A kind of preparation method of alicyclic epoxy resin hyperbranched polyester toughening agent for transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 240g of trimellitic anhydride, 24g of glycerol, 100g of pentaerythritol, 5g of anhydrous stannous chloride, and 500mL of N,N-dimethyl Formamide. Then the above mixture was heated to 130°C within 1 hour to carry out ring-opening esterification reaction of acid anhydride. After 8 hours, the temperature was controlled at 120°C, kept for 1 hour under the condition that the vacuum degree was less than -0.05MPa, and the material was cooled and discharged.

Embodiment 2

[0024] Add 240g of trimellitic anhydride, 24g of glycerol, 100g of pentaerythritol, 5g of anhydrous stannous chloride, and 500mL of dehydrated and dried N,N-dimethylmethane into a 1L three-neck flask equipped with a magnetic stirring oil bath and a spherical condenser. amides. Within 1 hour, the above mixture was heated to 130°C to carry out the acid anhydride ring-opening esterification reaction. After 8 hours of reaction, 70g of epichlorohydrin containing 2.1g of benzyldimethylamine was added, and the reaction was continued for 2 hours. After the reaction, The temperature is controlled at 120°C, kept for 1 hour under the condition that the degree of vacuum is less than -0.05MPa, and the material is cooled and discharged.

[0025] Add to 3,4-epoxy-6-methylcyclohexyl carboxylate-3', 4'-epoxy-6'-methylcyclohexyl methyl ester / MTHPA system in proportion of 2%-10% The epoxy resin toughening agent prepared in example 1, 2, the following experimental data of the mechanical property...

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Abstract

The invention relates to a preparation method of an alicyclic epoxy resin hyperbranched polyester flexibilizer for mutual inductors. Cast materials of epoxy resin comprise epoxy resin, filler, a curing agent and other auxiliary agents. The preparation method of the epoxy resin flexibilizer comprises steps as follows: a trimellitic anhydride and polyhydric alcohol mixture and an anhydride esterification catalyst are weighed, heated and stirred, have an esterification reaction for 8 h at the temperature of 130 DEG C and is cooled to 60 DEG C-80 DEG C, a low-molecular-weight epoxy compound containing benzyl dimethylamine with the mass fraction being 3% is added, the mixture continuously reacts for 2h and then is heated to reach 120 DEG C and vacuumized for 1h, the vacuum degree is controlled to be lower than minus 0.05MPa, and then the mixture is cooled and discharged. The hyperbranched polyester has unique performance and performs toughening and promotion functions on an alicyclic epoxy resin and anhydride system, and the flexibilizer is suitable for electrical insulation of outdoor mutual inductors and has certain economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of preparation of electrical chemical materials, in particular to a method for preparing an alicyclic epoxy resin hyperbranched polyester toughening agent for transformers. Background technique [0002] Epoxy resin is a widely used organic chemical raw material. The epoxy resin in the liquid system has a small shrinkage rate during the curing reaction process, and the cured product has excellent adhesion, heat resistance, chemical resistance, mechanical properties and electrical properties. specialty. [0003] The current commonly used one-step epoxy resin production process is: using bisphenol A and propylene oxide as raw materials to react under the action of sodium hydroxide, the by-products are NaCl and H 2 O, the specific reaction formula is as follows: [0004] [0005] The epoxy resin prepared by one-step production has a high crosslinking density after curing, but has disadvantages such as large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/12C08G63/85C08L63/00C08L67/00
Inventor 刘正林胡丰明张孝俊刘明才吴碧辉
Owner 安徽互感器有限公司