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A kind of preparation method of cardanol modified polyamine curing agent with high anticorrosion performance

A cardanol and polyamine technology, which is applied in the field of preparation of a cardanol-modified polyamine curing agent with high anticorrosion performance, can solve the problem that there is no fundamental solution to product color, chemical anticorrosion resistance, paint easily turns yellow, and anticorrosion performance is very high. Poor and other problems, to achieve high chemical corrosion resistance, improve stability, and change the effect of performance

Active Publication Date: 2021-11-30
ZHEJIANG WANSHENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Such as Chinese patent: CN101333286, adopt cardanol, formaldehyde, polyamine to react, carry out decompression dehydration after the reaction, obtain cardanol modified amine curing agent, and in this curing agent molecule, mainly be the compound of single molecule, on the chain The molecular double bond is very unstable, and the anti-corrosion performance is very poor. Under the condition of long-term light, the paint is easy to turn yellow, which affects the appearance of the paint film
[0005] Chinese patent CN107973899 changes the performance of the product by adding cardanol glyceryl ether and cardanol together with formaldehyde and polyamines, such as improving the color and hardness of the product. This patent does not fundamentally solve the color and chemical resistance of the product. Anti-corrosion performance problem

Method used

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  • A kind of preparation method of cardanol modified polyamine curing agent with high anticorrosion performance
  • A kind of preparation method of cardanol modified polyamine curing agent with high anticorrosion performance
  • A kind of preparation method of cardanol modified polyamine curing agent with high anticorrosion performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 1500kg of cardanol and 300kg of paraformaldehyde into the reaction kettle, and start to add 450kg of ethylenediamine dropwise at room temperature. Insulate at 75-80°C for 4 hours, add 15kg of azobisisobutylamidine hydrochloride to control the temperature at 95-100°C for 4-5 hours, then reduce the temperature to 80-85°C after the reaction, vacuum For: 10~15KPa, reddish brown solution after dehydration, amine value / (mgKOH / g)=305, viscosity / mpa . S=25080.

Embodiment 2

[0027] Add 1500kg of cardanol and 305kg of paraformaldehyde into the reaction kettle, start to add 450kg of ethylenediamine dropwise at room temperature, control the temperature at 75-80°C, add the time for about 2 hours, and keep warm at 75-80°C for 4 hours after the dropwise addition. After heat preservation, add 20kg of azobisisobutylamidine hydrochloride and control the temperature at 95-100°C for reflux reaction for 4-5 hours. After the reaction, reduce the temperature to 85-90°C. The vacuum degree is 15-20KPa. After dehydration, it is Reddish-brown solution, amine value / (mgKOH / g)=308, viscosity / mpa . S=28100.

Embodiment 3

[0029] Add 3000kg of cardanol and 600kg of paraformaldehyde into the reactor, start to add 901kg of ethylenediamine dropwise at room temperature, control the temperature at 75-80°C, add the time for about 4 hours, and keep the temperature at 75-80°C for 5 hours after the dropwise addition. After heat preservation, add 30kg of azobisisobutylamidine hydrochloride and control the temperature at 95-100°C for reflux reaction for 4-5 hours. After the reaction, lower the temperature and slowly remove it to the temperature of 80-90°C. The vacuum degree is: 15-20KPa, dehydration Afterwards, it is a reddish-brown solution, amine value / (mgKOH / g)=300, viscosity / mpa . S=29400.

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Abstract

The invention discloses a method for preparing a cardanol-modified polyamine curing agent. It performs Mannich reaction on cardanol, paraformaldehyde and amine compounds. After the reaction is completed, a water-soluble initiator is added to carry out polymerization reaction. The reaction ends After decompression steaming removes moisture and excessive amine compound, obtains cardanol modified polyamine curing agent, and the coating chemical resistance that curing agent and epoxy resin cure obtains have very big improvement, show that the present invention adopts water-soluble The non-toxic initiator can polymerize very good olefins, and the molecules after polymerization are obviously strengthened, so that the chemical resistance and corrosion resistance are greatly improved.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of a cardanol-modified polyamine curing agent with high anticorrosion performance. Background technique [0002] Cardanol is extracted from the shell of cashew nuts. It has the structure of phenolic hydroxyl group and can replace some phenolic compounds to participate in chemical reactions. It is a renewable biological resource and can solve part of the oil energy crisis. [0003] Due to the renewable nature of cardanol, cardanol is used to develop and apply many products. In the application of cardanol, it is mainly the preparation of cardanol curing agent. The prepared curing agent is cured with epoxy resin to obtain a product with high stability, A paint film that is resistant to high temperature and low temperature and works well. It is mainly used in the coating of paint film on ships and containers. [0004] Such as Chinese patent: CN10133328...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C213/08C07C215/50C08G59/50C09D163/00C09D5/08
CPCC07C213/02C07C213/08C08G59/5033C09D163/00C09D5/08C07C215/50C09D7/63C08K5/0025C08G59/4014C08G59/4007C07C39/19
Inventor 王秋伟顾奇李旭锋陈建吕云兴
Owner ZHEJIANG WANSHENG