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Epoxy curing agent as well as preparation method and application thereof

An epoxy curing agent and reaction technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of unsuitable curing agent, expensive polythiol, and low crosslinking density, so as to increase the curing speed and improve Low curing agent activity, effect of improving low temperature surface state

Pending Publication Date: 2022-03-11
瑞奇新材料(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymercaptan is expensive, has a strong smell, and the crosslinking density is not high, and the strength is low. It is not suitable for curing agents used in epoxy flooring. However, the curing agent prepared from the thiourea system shows good performance at low temperatures. Reactive, but the brittleness of the cured product is too high, so it is not suitable for curing agent for epoxy floor surface coating. Therefore, designing a curing agent with low temperature and fast curing, suitable viscosity and flexible ratio is the key to the current development

Method used

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  • Epoxy curing agent as well as preparation method and application thereof
  • Epoxy curing agent as well as preparation method and application thereof
  • Epoxy curing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First place 20g of hexamethylenediamine and 8g of thiourea in the reactor, control the reaction temperature at 120°C to 150°C, react for 2h, add 22g of polyetheramine D400, continue the reaction for 1h, add 9g of polypropylene glycol diglycidyl ether to react, control The temperature is 70°C to 90°C, react for 2 hours, add 5g of triethanolamine, 16g of cardanol, and 20g of benzyl alcohol to the reaction kettle in sequence, mix evenly, and discharge to obtain an epoxy curing agent.

Embodiment 2

[0043] First place 19g of isophoronediamine and 7g of thiourea in the reactor, control the reaction temperature at 120°C to 150°C, react for 2h, add 20g of polyetheramine D230, continue the reaction for 1h, add pentaerythyl glycol diglycidol React 8g of ether, control the temperature at 70°C to 90°C, react for 2h, add 8g of triethanolamine, 16g of nonylphenol, and 22g of benzyl alcohol to the reaction kettle in sequence, mix evenly, and discharge to obtain an epoxy curing agent.

Embodiment 3

[0045] Firstly, put 20g of methylcyclopentyldiamine and 7g of thiourea in the reactor, control the reaction temperature at 120℃~150℃, react for 2h, add 30g of polyetheramine T403, continue the reaction for 1h, add polyethylene glycol diglycidol React 8g of ether, control the temperature at 70°C to 90°C, react for 2h, add 5g of 2,4,6-tris(dimethylaminomethyl)phenol, 10g of n-butanol, and 20g of xylene to the reaction kettle in sequence, and mix well , discharging to obtain epoxy curing agent.

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Abstract

The invention belongs to the technical field of epoxy resin, and particularly relates to an epoxy curing agent and a preparation method and application thereof. The epoxy curing agent comprises the following raw materials: aliphatic amine / alicyclic amine, thiourea and polyether amine. The thiourea modified curing agent can still keep high activity at low temperature, and the problem of low activity of the curing agent caused by low temperature during construction in autumn and winter is effectively solved. Polyether amine has a bifunctional flexible chain segment, so that the molecular deflection of the curing agent is increased, long chain segments are mutually wound after curing, and the low-temperature toughness and impact resistance of a cured product are greatly improved. According to the preparation process of the epoxy curing agent, fatty amine / alicyclic amine and polyether amine react with thiourea respectively in two steps, and the situation that due to the fact that the two kinds of amine generate competitive reaction due to different activities, a designed product cannot reach an expected standard is avoided.

Description

technical field [0001] The invention belongs to the technical field of epoxy resin, and in particular relates to an epoxy curing agent and its preparation method and application. Background technique [0002] With the gradual increase of industrial plants, epoxy flooring has developed rapidly due to its advantages. Nowadays, epoxy resin used in coatings accounts for about 50% of epoxy resin applications, and epoxy flooring accounts for about 70% of the market share, which shows that its market audience cannot be underestimated. [0003] Epoxy floors can be classified into epoxy floor primers, epoxy floor primers, and epoxy floor topcoats according to the floor structure. No matter the floor coating prepared with epoxy resin and epoxy amine curing agent is solvent-based or solvent-free, there is a problem that it is difficult to cure or cannot be applied at all in the severe winter season or its alternate seasons. This is mainly because most epoxy curing agents use polyamin...

Claims

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Application Information

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IPC IPC(8): C08G59/50C09D163/00
CPCC08G59/504C09D163/00
Inventor 陈小双陈小金
Owner 瑞奇新材料(广州)有限公司
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