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Solidifiable resin composition in single constituent

A resin composition, one-component technology, applied in the field of one-component curable resin composition, can solve the problems of unsatisfactory requirements, low thermal strength, large linear shrinkage, etc., and achieve low shrinkage of cured products, High storage stability and high mechanical strength

Inactive Publication Date: 2006-07-05
上海电动工具研究所(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary unsaturated polyester resins are used in thermal curing systems. Due to the volatilization of styrene and the effect of oxygen inhibition, the surface layer cannot be fully cross-linked, resulting in surface stickiness.
At the same time, due to the large linear shrinkage of the thermally cured unsaturated polyester system at 6% to 8%, its application in the field of electrical processing is limited.
[0003] The two-component epoxy resin system is often used in electrical insulation treatment, but it is inconvenient to prepare insulating paint, and the pot life is also short. The thermal strength of the cured epoxy system is generally low. The insulation treatment of the rotor of the speed series motor can no longer meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 18.6 parts of propylene glycol and 25.9 parts of diethylene glycol are selected as polyols; 21.8 parts of maleic anhydride and 33.7 parts of tetrahydrophthalic anhydride are used for unsaturated polybasic acid (or anhydride); 42 parts of unsaturated polyester and active cross-linking monomer Select 40 parts of styrene, 17 parts of low-shrinkage additives, and 1 part of tert-butyl gram peroxide initiator.

[0029] In a 250ml three-neck flask, add maleic anhydride, tetrahydrophthalic anhydride, propylene glycol, and diethylene glycol in proportion to carry out esterification reaction, control the reaction temperature at 180°C, and react for 5 hours. Vacuum the esterification product gradually to 0.09Mpa, and maintain the reaction temperature at 200°C, carry out polycondensation reaction for 1 hour to obtain unsaturated polyester; heat the unsaturated polyester to 85°C under the protection of nitrogen, add benzene under stirring Ethylene and low-shrinkage additives, stirre...

Embodiment 2

[0031] 32.4 parts of dipropylene glycol and 14.5 parts of ethylene glycol are used for polyols; 20.8 parts of maleic anhydride and 32.3 parts of tetrahydrophthalic anhydride are used for unsaturated polyacids (or anhydrides); 47 parts of unsaturated polyesters, reactive crosslinking units The body uses 28 parts of butyl methacrylate, 23 parts of low-shrinkage additives, and 2 parts of dicumyl peroxide as peroxide initiator.

[0032] In a 250ml three-necked flask, add maleic anhydride, tetrahydrophthalic anhydride, dipropylene glycol, and ethylene glycol in proportion to carry out esterification reaction, control the reaction temperature at 200°C, and react for 6 hours; gradually add the esterification product Vacuum to 0.09Mpa, and maintain the reaction temperature at 201°C, carry out polycondensation reaction for 1 hour to obtain unsaturated polyester; heat the unsaturated polyester to 85°C under the protection of nitrogen, under the state of stirring, butyl methacrylate and l...

Embodiment 3

[0034] Polyhydric alcohol selects 27.9 parts of dipropylene glycol, 20.9 parts of pentylene glycol; Unsaturated polybasic acid (or anhydride) selects 21.2 parts of fumaric acid, 30 parts of endomethylene tetrahydrophthalic anhydride; 51 parts of unsaturated polyester, 20 parts of 2-methylstyrene, 15 parts of methylstyrene, 12.8 parts of low-shrinkage additives, and 1,1-bis(tert-butylperoxygen)-3 0.4 parts of peroxide initiator are selected as active cross-linking monomers parts, 5-trimethylcyclohexane and 0.8 parts.

[0035] In a 250ml three-necked flask, add fumaric acid, endomethylene tetrahydrophthalic anhydride, dipropylene glycol, and pentanediol in proportion to carry out esterification reaction, control the reaction temperature at 190°C, and react for 7 hours. Vacuum the esterification product gradually to 0.09Mpa, and maintain the reaction temperature at 202°C, carry out polycondensation reaction for 2 hours to obtain unsaturated polyester, heat the unsaturated polyest...

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Abstract

This invention relates to a single-component curable resin composite, which is uniquely made of following raw materials: 40~60% unsaturated polyesters, 30~50% active cross-linked monomers, 9~30% low-shrinkage additives and 0.5~3% peroxide initiators, and its preparation method, which comprises following steps: raw materials are taken at the fixed ratio; the unsaturated polyesters is heated in a vessel with the protection of nitrogen; active cross-linked monomers and low-shrinkage additives are added while the systems are stirred and cooled to room temperature; then peroxide initiators are added and the mixture is thoroughly stirred to homogeneity so as to produce single-component curable resin composite. This invention has the advantages of low initial viscosity, high curing speed, high preservation stability, low curing shrinkage, good toughness, high mechanical strength and considerable heat resistance up to H-class. It is applicable in insulation treatment of motors and electric wire coils.

Description

technical field [0001] The invention relates to a single-component curable resin composition, which can be widely used in the insulation treatment of electric tools, series-excited motor rotors for automobiles and motorcycles, and electrical coils, and belongs to the technical field of electrical insulation treatment. Background technique [0002] Ordinary unsaturated polyester resins used in thermal curing systems, due to the volatilization of styrene and the effect of oxygen inhibition, the surface layer cannot be fully cross-linked, resulting in surface stickiness. At the same time, due to the large linear shrinkage of the heat-cured unsaturated polyester system, which is 6% to 8%, its application in the field of electrical processing is limited. [0003] The two-component epoxy resin system is often used in electrical insulation treatment, but it is inconvenient to prepare insulating paint, and the pot life is also short. The thermal strength of the cured epoxy system is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/14C08L51/08
Inventor 陆顺平王峰张防王华
Owner 上海电动工具研究所(集团)有限公司
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