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Water-based latent curing agent for epoxy resin and application of water-based latent curing agent

An epoxy resin curing and latent technology, which is applied in fiber processing, textiles and papermaking, carbon fiber, etc., can solve the problems of negative impact on the interface of composite materials, affecting the bonding of fiber and matrix, and the reduction of carbon fiber clustering, so as to improve the fiber and Substrate bonding, shortening reaction time, increasing the effect of connection points

Active Publication Date: 2013-01-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of emulsifiers in the preparation of epoxy emulsions, the emulsifiers have poor cohesiveness, which leads to a decrease in the aggregation of carbon fibers, affects the bonding between fibers and the matrix, and also has a negative impact on the interface of composite materials.

Method used

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  • Water-based latent curing agent for epoxy resin and application of water-based latent curing agent
  • Water-based latent curing agent for epoxy resin and application of water-based latent curing agent
  • Water-based latent curing agent for epoxy resin and application of water-based latent curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of Polymers of Ethylene Glycol Bisglycidyl Ether and Polyethylene Glycol

[0022] In a four-necked flask with condensed water, put 10g of polyethylene glycol 4000 and 0.96g of ethylene glycol bisglycidyl ether, then add 20ml of acetone as a solvent, heat and stir at 40°C to mix the materials evenly. Keep the temperature constant and add 0.42g of boron trifluoride etherate complex and 9.58g of solvent acetone to form a boron trifluoride catalyst solution with a concentration of 2%wt. Add dropwise for 1 hour. After the dropwise addition, keep the temperature constant and continue stirring React for 1h, terminate the reaction to obtain a polymer, wherein the molar ratio of ethylene glycol bisglycidyl ether to polyethylene glycol is 2.2:1;

[0023] Preparation of water-based latent epoxy resin curing agent

[0024] Primary amine groups according to DDS vs. step by step The mol ratio that makes the epoxy group of polymkeric substance is 2:1, takes by weigh...

Embodiment 2

[0028] Preparation of Polymers of Ethylene Glycol Bisglycidyl Ether and Polyethylene Glycol

[0029] In a four-necked flask with condensed water, put 5g of polyethylene glycol 2000 and 0.96g of ethylene glycol bisglycidyl ether, and then add about 20ml of acetone as a solvent, and heat and stir at 40°C to mix the materials evenly. Keeping the temperature constant, add 0.21g boron trifluoride diethyl ether complex and 4.79g solvent acetone to form a concentration of 2%wt boron trifluoride catalyst solution. Others are the same as in Example 1, wherein ethylene glycol bisglycidyl ether and poly The molar ratio of ethylene glycol is 2.2:1;

[0030] Preparation of water-based latent epoxy resin curing agent

[0031] Primary amine groups according to DDS vs. step by step The mol ratio that makes the epoxy group of polymkeric substance is 2:1, takes by weighing 1.22gDDS, and drops into step The prepared polymer was stirred and heated at 130° C. for 3 hours to obtain a water...

Embodiment 3

[0035] Preparation of Polymers of Ethylene Glycol Bisglycidyl Ether and Polyethylene Glycol

[0036]Put 2.5g of polyethylene glycol 1000 and 0.96g of ethylene glycol bisglycidyl ether into a four-necked flask with condensed water, then add about 20ml of acetone as a solvent, heat and stir at 40°C to mix the materials evenly. Keeping the temperature constant, add 0.10g boron trifluoride etherate complex and 2.40g solvent acetone to form a concentration of 2%wt boron trifluoride catalyst solution. Others are the same as in Example 1, wherein ethylene glycol bisglycidyl ether and poly The molar ratio of ethylene glycol is 2.2:1;

[0037] Preparation of water-based latent epoxy resin curing agent

[0038] Primary amine groups according to DDS vs. step by step The mol ratio that makes the epoxy group of polymkeric substance is 2:1, takes by weighing 1.22gDDS, and drops into step The prepared polymer was stirred and heated at 130° C. for 3 hours to obtain a water-based late...

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Abstract

The invention discloses a water-based latent curing agent for an epoxy resin and application and a preparation method of the water-based latent curing agent. The preparation method of the water-based latent curing agent for the epoxy resin comprises two steps of: preparing a polymer of ethylene glycol diglycidyl ether and polyethylene glycol; and preparing the water-based latent curing agent for the epoxy resin. A sizing agent which is prepared from the water-based latent curing agent for the epoxy resin is safe and sanitary, the stability and the bundling of the emulsion can be improved, and the interface adhesion strength of the epoxy resin carbon fiber composite materials is improved.

Description

technical field [0001] The invention relates to a preparation method of a water-based latent epoxy resin curing agent and its application in a carbon fiber sizing agent, belonging to the fields of organic chemistry and fiber materials. Background technique [0002] Epoxy resin has excellent adhesion and low volume shrinkage (about 2%) on many substrate materials, and is widely used in various fields such as coatings, adhesives and composite materials. The epoxy resin itself has a thermoplastic linear structure, and it needs to add a curing agent to carry out addition polymerization reaction with the epoxy group of the epoxy resin under certain temperature and other conditions to form a cured product with a three-dimensional network structure before it can be used. Curing agent is one of the key factors affecting the performance of two-component epoxy coatings. With the improvement of people's awareness of environmental protection, the water-based epoxy coating has become it...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08G65/48D06M15/55D06M15/53D06M13/165D06M101/40
Inventor 田艳红胡琪张学军
Owner BEIJING UNIV OF CHEM TECH
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