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Toughening modified epoxy curing agent for dry-type transformer and preparation method of toughening modified epoxy curing agent

An epoxy curing agent, dry-type transformer technology, applied in the chemical industry, climate sustainability, sustainable manufacturing/processing, etc. problems, to achieve the effect of high controllability of the production process and simple preparation process

Active Publication Date: 2022-08-05
嘉兴南洋万事兴化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the applicant found that: although the curing agent in the related technologies can play a certain role in toughening, after toughening, the overall glass transition temperature Decrease, which reduces the heat resistance of the finished product and affects the subsequent normal use of the finished product

Method used

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  • Toughening modified epoxy curing agent for dry-type transformer and preparation method of toughening modified epoxy curing agent
  • Toughening modified epoxy curing agent for dry-type transformer and preparation method of toughening modified epoxy curing agent

Examples

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preparation example 1

[0040] The preparation technology of methyltetrahydrophthalic anhydride, comprises the following steps:

[0041]Step 1, the diene synthesis procedure prepares the crude product of methyltetrahydrophthalic anhydride: piperylene, isoprene, polymerization inhibitor-diquinone, sodium isopropionate (maleic anhydride quality of 0.3%) into the reaction kettle, the temperature in the kettle is raised to 70°C, and the pressure in the kettle is adjusted to 0.2MPa; maleic anhydride is added dropwise to the reaction kettle, and the temperature in the kettle is controlled at 45°C during the dropping process, so that The temperature in the kettle was kept at 90°C for 3 hours; then the pressure in the kettle was reduced to 80kPa, the temperature was raised to 140°C, and the remaining unreacted piperylene, isoprene and polymerization inhibitor were distilled off to obtain a crude product;

[0042] Step 2, isomerization and rectification process to prepare high-purity methyltetrahydrophthalic ...

Embodiment 1

[0045] A toughening modified epoxy curing agent for dry-type transformers disclosed in the present application is prepared from the following raw materials: methyltetrahydrophthalic anhydride, sodium acetate pentahydrate, and a polymer with a weight average molecular weight of 2000. Propylene glycol diglycidyl ether. The molar amount of methyltetrahydrophthalic anhydride is 0.96 times the total molar amount of hydroxyl groups in the polyol. The catalyst is 0.005 times the mass of methyltetrahydrophthalic anhydride.

[0046] The preparation technology of methyltetrahydrophthalic anhydride, comprises the following steps:

[0047] Step 1, the diene synthesis process prepares the crude product of methyltetrahydrophthalic anhydride: put piperylene, isoprene and polymerization inhibitor into the reaction kettle, the temperature in the kettle is raised to 55°C, and the The internal pressure was adjusted to 0.08-0.09MPa; maleic anhydride was added dropwise to the reaction kettle, an...

Embodiment 2

[0055] The difference between Example 2 and Example 1 is: a toughening modified epoxy curing agent for dry-type transformers is prepared from the following raw materials: methyltetrahydrophthalic anhydride, sodium acetate pentahydrate , Polypropylene glycol diglycidyl ether with a weight average molecular weight of 1000.

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Abstract

The invention relates to the technical field of epoxy hardeners, in particular to a toughening modified epoxy hardener for a dry-type transformer, a preparation method and an epoxy resin potting material prepared from the toughening modified epoxy hardener. The invention discloses a toughening modified epoxy curing agent for a dry-type transformer. The weight-average molecular weight of the toughening modified epoxy curing agent is 6000-8000. The toughening modified epoxy curing agent is prepared from the following raw materials: methyl tetrahydrophthalic anhydride, a catalyst and polyol; the weight-average molecular weight of the polyhydric alcohol is 2000 to 4000; the proportion of a trans structure in the methyl tetrahydrophthalic anhydride is controlled to be 35 to 45 percent. The toughened and modified epoxy curing agent can play a role in toughening and reinforcing the epoxy resin potting material, the impact strength can be improved by 8-20%, the bending strength can be improved by 15-20%, and the Tg temperature is controlled to be 90-100 DEG C.

Description

technical field [0001] The present application relates to the technical field of epoxy curing agents, in particular to a toughening and modified epoxy curing agent for dry-type transformers, a preparation method and an epoxy resin potting compound prepared by using the same. Background technique [0002] In the past two decades, with the development of the world economy, dry change has achieved rapid development all over the world, especially in distribution transformers, the proportion of dry change is increasing. With the rapid development of urbanization construction in my country, the pace of urban and rural power grid construction is accelerating, making my country the country with the largest production and sales of dry transformers in the world. Epoxy resin potting material is used in the production process of dry-type transformers, and epoxy resin potting materials will affect the mechanical strength, electrical strength and heat resistance of dry-type transformers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/42C08G63/676C08G63/553C08G63/58C08L63/02C08L67/02
CPCC08G59/4276C08G63/676C08G63/553C08G63/58C08L63/00C08L67/02Y02P20/10
Inventor 张建林
Owner 嘉兴南洋万事兴化工有限公司
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