Cardanol modified amine epoxy resin curing agent as well as preparation method and application thereof

A technology for amine epoxy resin and resin curing, which is applied in the field of cardanol-modified amine epoxy resin curing agent and its preparation, and can solve problems such as limited application

Inactive Publication Date: 2020-10-20
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cured product usually cannot take into account the improvement of toughness under the condition of rapid curing at room temperature, which limits its application.

Method used

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  • Cardanol modified amine epoxy resin curing agent as well as preparation method and application thereof
  • Cardanol modified amine epoxy resin curing agent as well as preparation method and application thereof
  • Cardanol modified amine epoxy resin curing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Add 30g of cardanol and 25g of cardanol into a round bottom flask, start stirring, raise the temperature to 40°C, add 4g of sodium hydroxide particles; after the dissolution is complete, raise the temperature to 60°C, slowly add 0.56g of chloroacetic acid catalyst, acid catalyst After dissolving, raise the temperature to 90°C, keep it warm for 2 hours, let it stand still, separate the liquid and evacuate to obtain the intermediate product;

[0028] 2. Raise the temperature of the intermediate product obtained in step 2 to 40°C, start stirring, control the temperature not higher than 50°C, slowly add 35g of formaldehyde solution dropwise (after 20 minutes), then slowly add 51.5g of diethylenetriamine, and raise the temperature to 120°C , keep it warm for 30 minutes, then raise the temperature to 140°C, keep it warm for 30 minutes, then raise the temperature to 170°C, keep it warm for 50 minutes, then cool down to 90°C after the reaction is over, decompress and vacuum d...

Embodiment 2

[0030] 1. Add 30g of cardanol and 25g of cardanol into a round bottom flask, start stirring, raise the temperature to 40°C, add 4g of sodium hydroxide particles; after the dissolution is complete, raise the temperature to 60°C, slowly add 0.56g of chloroacetic acid catalyst, acid catalyst After dissolving, raise the temperature to 90°C, keep it warm for 2 hours, let it stand still, separate the liquid and evacuate to obtain the intermediate product;

[0031] 2. Raise the temperature of the intermediate product obtained in step 2 to 40°C, start stirring, control the temperature not higher than 50°C, slowly add 35g of formaldehyde solution dropwise (after 20 minutes), then slowly add 59.8g of triethylenetetramine, and raise the temperature to 120°C , keep it warm for 30 minutes, then raise the temperature to 140°C, keep it warm for 30 minutes, then raise the temperature to 170°C, keep it warm for 50 minutes, then cool down to 90°C after the reaction, and depressurize and vacuum d...

Embodiment 3

[0033] 1. Add 30g of cardanol and 25g of cardanol into a round bottom flask, start stirring, raise the temperature to 40°C, add 4g of sodium hydroxide particles; after the dissolution is complete, raise the temperature to 60°C, slowly add 0.56g of chloroacetic acid catalyst, acid catalyst After dissolving, raise the temperature to 90°C, keep it warm for 2 hours, let it stand still, separate the liquid and evacuate to obtain the intermediate product;

[0034] 2. Raise the temperature of the intermediate product obtained in step 2 to 40°C, start stirring, control the temperature not higher than 50°C, slowly add 35g of formaldehyde solution dropwise (20min to finish), then slowly add 36.0g of diethylenetriamine and 27.2g of triethylene Tetramine, heat up to 120°C, keep warm for 30 minutes, then heat up to 140°C, keep warm for 30 minutes, then heat up to 170°C, keep warm for 50 minutes, cool down to 90°C after the reaction, and depressurize and vacuum dehydrate at this temperature ...

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PUM

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Abstract

The invention belongs to the technical field of epoxy resin curing agents, and discloses a cardanol modified amine epoxy resin curing agent as well as a preparation method and application thereof. Thecuring agent is prepared by the following steps: mixing cardanol and phenols, heating to 30-40 DEG C, stirring, adding alkali, heating to 60-70 DEG C, adding an acid catalyst, stirring to dissolve, heating to 80-90 DEG C, reacting, standing, separating liquid, and vacuumizing to obtain an intermediate product; and heating the intermediate product to 30-40 DEG C, stirring, adding aldehyde, controlling the temperature to be less than 50 DEG C, dropwise adding amine at 30-40 DEG C after the aldehyde is added, stirring, heating to 115-175 DEG C, cooling to 90-95 DEG C after the reaction is finished, and carrying out vacuum dehydration under reduced pressure. The curing agent has good hydrophobicity, flexibility and protective function, mild heat release and moderate curing speed, avoids degradation of the toughness of epoxy resin in the fast curing process, and is applied to the field of quick curing or toughening of epoxy resin.

Description

technical field [0001] The invention belongs to the technical field of epoxy resin curing agents, and more specifically relates to a cardanol-modified amine epoxy resin curing agent and its preparation method and application. Background technique [0002] Epoxy resins are widely used in coatings, adhesives, composite materials and other fields. In order to meet their application requirements in different fields, different types of curing agents are required. Traditional aliphatic amine curing agents are brittle due to their high volatility and toxicity. The Mannich base curing agent obtained through Mannich reaction modification can well solve the problems of high volatility and high toxicity of traditional aliphatic amine curing agents. The more successful ones are T31 series phenalkamine curing agents. The phenolic hydroxyl group on the benzene ring of the phenalkamine curing agent promotes the ring opening of the epoxy group. The curing agent has a very high room tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62C07C213/02C07C215/50
CPCC07C213/02C08G59/623C07C2601/14C07C215/50
Inventor 高振忠侯贤锋孙瑾王晓波李锰
Owner SOUTH CHINA AGRI UNIV
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