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Low-temperature resistant epoxy resin and preparation method therefor

A technology of epoxy resin and low temperature resistance, applied in the polymer field, can solve the problems that epoxy resin does not have low temperature usability, the performance of epoxy resin is degraded, etc., and achieves the effect of simple and easy preparation method, low cost and good toughness

Inactive Publication Date: 2017-12-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Current research shows that carbon fiber still has very good performance under low temperature conditions, but the performance of epoxy resin will drop a lot under low temperature conditions, and pure epoxy resin does not have low temperature usability

Method used

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  • Low-temperature resistant epoxy resin and preparation method therefor
  • Low-temperature resistant epoxy resin and preparation method therefor

Examples

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Effect test

Embodiment 1

[0025] A low temperature resistant epoxy resin, the preparation method is as follows:

[0026] 1) Preparation of modified amine curing agent: Add acrylonitrile dropwise to PACM for reaction at 80°C while stirring. The molar ratio of acrylonitrile to PACM is 1:1. If the temperature is higher than 90°C, after the dropwise addition is completed, keep the temperature at 80°C for 1 hour, and then raise the temperature to 120°C for 1 hour to obtain a modified amine curing agent;

[0027] 2) Preparation of low temperature resistant epoxy resin: mix 100 parts of epoxy resin with 70 parts of modified amine curing agent in parts by mass, then cure at 110°C for 4 hours, then heat up to 160°C and cure for 2 hours to obtain low temperature resistant epoxy resin.

[0028] According to the standard GB / T 2570-95 casting body bending performance test method, the elastic modulus of the low-temperature resistant epoxy resin sample obtained in this example after low-temperature aging treatment (...

Embodiment 2

[0030] A low temperature resistant epoxy resin, the preparation method is as follows:

[0031] 1) Preparation of a modified amine curing agent: select an alicyclic amine curing agent diaminodicyclohexylmethane and acrylonitrile to synthesize a modified amine curing agent. Under the condition of a temperature of 80°C, add acrylonitrile dropwise to PACM for reaction while stirring, wherein the molar ratio of acrylonitrile to PACM is 2:1, and the temperature of the reaction system is controlled not to be higher than 90°C during the dropping process. After the dropwise addition, keep the temperature at 80°C for 2 hours, then increase the temperature to 120°C and keep it for 2 hours to obtain a modified amine curing agent;

[0032] 2) Preparation of low temperature resistant epoxy resin: mix 100 parts of epoxy resin with 105 parts of modified amine curing agent in parts by mass, then cure at 110°C for 4 hours, and then cure at 180°C for 2 hours to obtain low temperature resistant e...

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Abstract

The invention relates to low-temperature resistant epoxy resin and a preparation method therefor. The low-temperature resistant epoxy resin is prepared through mixing epoxy resin and a modified amine curing agent and then carrying out curing, wherein the modified amine curing agent is obtained through polymerizing an alicyclic amine curing agent and acrylonitrile. The preparation method for the low-temperature resistant epoxy resin comprises the steps: 1) preparing the modified amine curing agent; and 2) preparing the low-temperature resistant epoxy resin: uniformly mixing the epoxy resin and the modified amine curing agent according to the mass ratio of 100: (40 to 130), and then, carrying out curing, thereby obtaining the low-temperature resistant epoxy resin. The epoxy resin provided by the invention is good in toughness, has very low modulus change rate under ultralow-temperature conditions, still has good performance in low-temperature environments and can serve as a carbon fiber reinforced composite low-temperature storage tank material.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and relates to a low-temperature-resistant epoxy resin and a preparation method thereof. Background technique [0002] With the development of society, there are more and more occasions that require low temperature resistant materials. For example, the commonly used cryogenic storage tank material system uses carbon fiber reinforced resin composite material (CFRP) as the main material. Commonly used resin materials are epoxy resin and the like. The overall temperature resistance, toughness, corrosion resistance and other properties of composite materials are mainly provided by the resin matrix. At the same time, the quality of the resin system and the interface phase is also very directly related. Only a good combination between the resin system and the fiber can have a good interface. At the same time, this also requires the resin system to meet the good manufacturability required for p...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08L63/00C08K7/06
CPCC08G59/5026C08K7/06C08L63/00
Inventor 王钧吴熊蔡浩鹏陈晞
Owner WUHAN UNIV OF TECH
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