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Epoxy resin curing agent, preparation method thereof and epoxy resin

A technology of epoxy resin curing and epoxy resin, applied in the field of curing agent, can solve the problems of low environmental performance, poor hydrophobicity, poor impact resistance, etc., achieve strong environmental performance, improve heat resistance, and good impact resistance Effect

Active Publication Date: 2016-11-16
湖南天氟新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water contact angle of the cured product obtained with this curing agent is 84.3-98.4 degrees, the tensile strength is 63.14-69.23MPa, and the elongation at break is 7.3-10.7%, but due to the low fluorine content, the hydrophobicity is not good
Chinese published patent CN104844784A discloses a flexible curing agent for epoxy resin and its synthesis method. The curing agent contains polyether chains. The cured epoxy resin has certain flexibility but poor water resistance.
Therefore, the epoxy resin curing agent in the related art has the disadvantages of poor heat resistance, weather resistance, water resistance, flexibility, impact resistance and low environmental performance

Method used

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  • Epoxy resin curing agent, preparation method thereof and epoxy resin
  • Epoxy resin curing agent, preparation method thereof and epoxy resin
  • Epoxy resin curing agent, preparation method thereof and epoxy resin

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preparation example Construction

[0027] The present invention also provides a preparation method of the epoxy resin curing agent, which comprises the following steps:

[0028] Step 1, under the protection of inert gas, put the solvent, perfluoropolyether acyl fluoride, polyamine and solvent into a reaction kettle equipped with a condensation reflux device, and react in an environment of 20-80 ° C for 2-24 hours;

[0029] Step 2, use one or more of methanol, ethanol, methyl acetate, butyl acetate, acetone to wash impurities, then remove the solvent by rotary evaporation under reduced pressure, and then remove solid impurities by filtration;

[0030] Step 3, extracting the solvent by rotary evaporation under reduced pressure to obtain the epoxy resin curing agent,

[0031] Wherein, the molar ratio of the perfluoropolyether acyl fluoride to the polyamine is 1: (0.8-1.5), and the input amount of the solvent is twice or twice the input amount of the perfluoropolyether acyl fluoride, so The usage amount of one or ...

Embodiment 1

[0039] Put 500g of trifluorotoluene into a reaction kettle equipped with a condensation reflux device, then dissolve 250g of perfluoropolyether acyl fluoride with a molecular weight of 3000 in trifluorotoluene under the protection of nitrogen, and then add dropwise under the protection of nitrogen 5 g of ethylenediamine was added dropwise for 0.5 hours, and the reaction was carried out at 25°C for 6 hours. After the reaction is completed, use 500g of methanol to wash the impurities, then remove the solvent by rotary evaporation under reduced pressure, remove solid impurities by filtration, and finally remove the solvent by rotary evaporation under reduced pressure to obtain a colorless transparent viscous liquid, which is perfluoropolyethylene. Ether-modified epoxy resin curing agent.

[0040] Mix 10 parts of the above epoxy resin curing agent with 100 parts of bisphenol A epoxy resin with an epoxy value of 0.51, and cure at room temperature for 24 hours to obtain an epoxy res...

Embodiment 2

[0042]Put 250g of tetrafluoroethyl butyl ether into a reactor equipped with a condensation reflux device, then dissolve 250g of perfluoropolyether acyl fluoride with a molecular weight of 5000 in tetrafluoroethyl butyl ether under nitrogen protection, Then, under the protection of nitrogen, 3 g of p-phenylenediamine was added dropwise for 0.5 hours, and the reaction was carried out at 50° C. for 12 hours. After the reaction is completed, use 250g of ethanol to wash the impurities, then remove the solvent by rotary evaporation under reduced pressure, then remove the solid impurities by filtration, and finally remove the solvent by rotary evaporation under reduced pressure to obtain a colorless transparent viscous liquid, which is perfluoropolymer. Ether-modified epoxy resin curing agent.

[0043] Mix 50 parts of the above curing agent with 100 parts of bisphenol A epoxy resin with an epoxy value of 0.42, and cure at room temperature for 24 hours to obtain an epoxy resin. The m...

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Abstract

The invention provides an epoxy resin curing agent. The epoxy resin curing agent is characterized in that a structural formula is shown as follows, wherein PFPE refers to a perfluoropolyether chain segment, one or multiple repetitive units of -CF2CF2O-, -CF2CF(CF3)O-, -CF2O-, -CF(CF3)O-, -CF2CF2CF2O- and -C(CF3)2O- are contained in the chain segment, molecular weight of the epoxy resin curing agent is 300-10000, and R refers to fatty or aromatic divalent group which contains fatty group and aromatic group with at least two carbon atoms. Compared with related technology, the epoxy resin curing agent has the advantages of high heat resistance, high weatherability, high waterproofness, high flexibility, high impact resistance and high environment friendliness.

Description

【Technical field】 [0001] The invention relates to the technical field of curing agents, in particular to an epoxy resin curing agent and a preparation method thereof, and an epoxy resin. 【Background technique】 [0002] Amine curing agent is the most widely used epoxy resin curing agent, accounting for about 70% of epoxy resin curing agent. The cured products of amines have good properties, but have disadvantages such as high volatility, high toxicity, poor water resistance, and severe curing heat. In order to overcome the above shortcomings and improve the performance of epoxy resin cured products, amine curing agents should be modified, but there are still many defects in modified amine curing agents. For example, the polyetheramine curing agent contains -CH2OCH2- structure, although the flexibility and impact resistance are good, the cured product is colorless and transparent, but the heat resistance and weather resistance are poor, and it is easy to yellow. The introduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/333C08G65/48C08G59/54
CPCC08G59/54C08G65/33306C08G65/33313C08G65/48
Inventor 夏杰董其宝王芳张驭
Owner 湖南天氟新材料有限公司
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