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Polythiol epoxy resin curing agent and preparation method thereof

A technology for epoxy resin curing and epoxy resin, which is applied in the field of polythiol epoxy resin curing agent and its preparation, can solve the problems such as complicated product purification steps, achieve low production raw material costs, overcome insufficient toughness, and improve esterification Yield effect

Inactive Publication Date: 2013-01-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this preparation method is that the purification steps of the product are complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 15.1 parts of sorbitol, 0.002 parts of p-toluenesulfonic acid, 54.2 parts of thioglycolic acid and 30.6 parts of toluene into a 250ml three-necked flask equipped with a condenser and a stirrer. After refluxing for 4 hours, distillation under reduced pressure was carried out. Add 9.1 parts of epoxy resin (638) and react at 100°C for 1 hour.

Embodiment 2

[0020] Add 15.1 parts of sorbitol, 0.002 parts of p-toluenesulfonic acid, 54.2 parts of thioglycolic acid and 30.6 parts of toluene into a 250ml three-necked flask equipped with a condenser and a stirrer. After refluxing for 4 hours, distillation under reduced pressure was carried out. Add 12.1 parts of epoxy resin (6101) and react at 100°C for 1.5h.

Embodiment 3

[0022] Add 15.1 parts of sorbitol, 0.002 parts of p-toluenesulfonic acid, 54.2 parts of thioglycolic acid and 30.6 parts of toluene into a 250ml three-necked flask equipped with a condenser and a stirrer. After refluxing for 4 hours, distillation under reduced pressure was carried out. Add 18.1 parts of epoxy resin (618) and react at 100°C for 2h.

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Abstract

The invention relates to a curing agent, particularly a polythiol epoxy resin curing agent and a preparation method thereof. The polythiol epoxy resin curing agent uses cheap and accessible raw materials to greatly lower the cost of the polythiol epoxy resin fast curing agent. The preparation method comprises the following steps: after esterifying sorbitol, thioglycollic acid, p-toluenesulfonic acid and methylbenzene, distilling out the liquid under reduced pressure at uniform speed by controlling the temperature and vacuum degree until no liquid is distilled out, and adding epoxy resin to carry out chain extending reaction, thereby obtaining the polythiol epoxy resin curing agent. The polythiol epoxy resin curing agent is a colorless or light yellow transparent liquid poly-sulfhydryl epoxy grafted compound with certain viscosity, the pH value is 2-4, and the density is 1.2-1.3 g / cm<3>.

Description

Technical field [0001] The invention relates to a curing agent, in particular to a polythiol epoxy resin curing agent and a preparation method thereof. Background technique [0002] Epoxy resin adhesive has good physical and chemical properties, it has excellent bonding strength to the surface of metal and non-metal materials, good dielectric properties, low variable shrinkage, good product dimensional stability, high hardness, and relatively flexible Good, excellent processing technology, stable to alkali and most solvents, so it is widely used in various sectors of national defense and national economy, and has a wide range of applications in casting, dipping, laminating, adhesive, coating, etc. Commonly used curing agents for epoxy resin mainly include amines, acid anhydrides, imidazoles, etc. [0003] The end of the polythiol curing agent is a thiol group (-SH). When used alone, the activity is very poor. The reaction is extremely slow at room temperature and can hardly procee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/66
Inventor 邹友思洪阿乐林华端吕耕敏蒲珏文尚明屹黄莺郑延清
Owner XIAMEN UNIV
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