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Compound modified aliphatic amine curing agent

A technology of aliphatic amines and curing agents, applied in the direction of organic chemistry, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of reduced strength, shortened operation period, etc., and achieve the effects of reducing consumption, reducing energy consumption, and being convenient to use

Inactive Publication Date: 2013-04-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cardanol acetal hexamethylenediamine curing agent in this patent is solid at normal temperature, and needs to be heated to be compatible with epoxy resin when used, and mixing with epoxy resin after heating will shorten the operation period, and The natural long-chain substituted phenalkamine curing agent greatly reduces the strength of the epoxy cured product while improving its toughness

Method used

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  • Compound modified aliphatic amine curing agent
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  • Compound modified aliphatic amine curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 60g cardanol, 21.6g m-cresol, 23.2g hexamethylenediamine, and 20.6g triethylenediamine into a 250ml four-neck flask equipped with a stirring, reflux device, and a thermometer, and stir for 20-30min to make it evenly mixed. And raise the temperature to 85°C; add 12.6g of paraformaldehyde to the reaction solution in 5~6 times at 85°C within 0.5~1h; after the paraformaldehyde is completely dissolved, let the reaction solution react at 85°C for 3h; then reduce Distill under reduced pressure at a temperature of 85-95°C and a pressure of 0.0013-0.0213Mpa, and stop the vacuum distillation until there are no more droplets on the inner wall of the flask; collect the product after the product cools down. The obtained product was a reddish-brown liquid with an amine value of 390 mgKOH / g and a viscosity of 940 mPa·s (25°C).

Embodiment 2

[0032] In a 250ml four-necked flask equipped with a stirring, reflux device, and a thermometer, add 60g of cardanol, 44g of nonylphenol, 23.2g of hexamethylenediamine, and 20.6g of triethylenediamine, and stir for 20 to 30 minutes to make it evenly mixed, and Raise the temperature to 85°C; add 12.6g of paraformaldehyde to the reaction solution in 5~6 times at 85°C within 0.5~1h; after the paraformaldehyde is completely dissolved, let the reaction solution react at 85°C for 3h; then depressurize Distillation at a temperature of 85-95°C and a pressure of 0.0013-0.0213Mpa. Stop vacuum distillation until there are no more droplets on the inner wall of the flask; collect the product after the product cools down. The obtained product is a reddish-brown liquid with an amine value of 325 mgKOH / g and a viscosity of 1300 mPa·s (25°C).

Embodiment 3

[0034]Add 30g cardanol, 10.8g m-cresol, 13.9g hexamethylenediamine, and 8.2g triethylenediamine into a 250ml four-neck flask equipped with a stirring, reflux device, and a thermometer, and stir for 20 to 30 minutes to make it evenly mixed. And raise the temperature to 85°C; add 6.3g paraformaldehyde to the reaction solution in 5~6 times at 85°C within 0.5~1h; after the paraformaldehyde is completely dissolved, let the reaction solution react at 85°C for 3h; then reduce Distill under reduced pressure at a temperature of 85-95°C and a pressure of 0.0013-0.0213Mpa, and stop the vacuum distillation until there are no more droplets on the inner wall of the flask; collect the product after the product cools down. The obtained product is a reddish-brown liquid with an amine value of 380 mgKOH / g and a viscosity of 980 mPa·s (25°C).

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Abstract

The invention provides a compound modified aliphatic amine curing agent, which is liquid state at normal temperature, has low viscosity and proper curing speed, can improve the toughness of a cured substance and reduce the reduction of the strength, and can regulate the proportion of compound modification according to the purpose of the cured substance. The curing agent is prepared by phenol, aldehyde and amine through mannich condensation reaction, wherein the molar ratio of the phenol, the aldehyde and the amine is 1: (0.8-1.0): (0.8-1.0). The preparation technology is as follows: 1. uniformly mixing the phenol and the amine according to certain molar ratio in a flask through stirring, and heating up to 50-85DEG C; 2. adding paraformaldehyde of corresponding molar into the flask by 5-6 times in 0.5-1 hour, wherein the temperature is 50-85DEG C; 3. reacting the mixed liquor for 2-5 hours at 60-100DEG C; and 4. carrying out reduced-pressure distillation at the temperature of 70-100DEG C and the pressure of 0.0013-0.0313MPa to remove water in the product and collecting the product.

Description

technical field [0001] The invention belongs to the field of epoxy resin curing agents, and relates to a compounded and modified fatty amine curing agent, in particular through the Mannich condensation reaction of in-situ depolymerization liquid of paraformaldehyde with phenolic substances and fatty amine substances Synthetic curing agent. Background technique [0002] Epoxy resin is a kind of thermosetting resin polymer synthetic material with good adhesion, corrosion resistance, electrical insulation, high strength and other properties, but only when a curing agent is added during its use, and the curing reaction is carried out under certain conditions Only when the product of three-dimensional three-dimensional network structure is formed can it show its various excellent properties and become a material with real use value. Therefore, the curing agent determines the excellent performance of the epoxy resin to a certain extent. Amine curing agent is a kind of curing age...

Claims

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Application Information

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IPC IPC(8): C08G59/62C07C213/02C07C215/50
Inventor 彭清海刘媛王娟徐世爱
Owner EAST CHINA UNIV OF SCI & TECH
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