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Method for synthesizing end-amino epoxy resin toughening type curing agent

An amino-terminated epoxy resin and a synthesis method technology, applied in the field of polymer materials and composite materials, can solve problems such as uneven mixing, poor toughening effect, and difficult phase structure control, and achieve simple synthesis process and easy operation convenient effect

Inactive Publication Date: 2015-12-09
HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses physical blending to obtain modified epoxy resin. In the process of polymerization-induced phase separation, the phase structure of the system needs to be effectively controlled to greatly improve its performance. There are problems such as uneven mixing, difficult phase structure control, and poor toughening effect. shortcoming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100 g of 4,4'-diaminodiphenyl ether into a three-necked flask, add an appropriate amount of organic solvent, blow nitrogen, and stir at room temperature until the 4,4'-diaminodiphenyl ether is completely dissolved. Add 77.5 g of diphenyl ether tetracarboxylic dianhydride into the above-mentioned three-necked flask, control the reaction temperature at 30° C., and stir for 5 hours to obtain a light yellow transparent liquid. Drop the obtained light yellow transparent liquid into deionized water, stir to obtain a white turbid suspension, wash and filter with suction to obtain a white filter cake, put it in 30°C and vacuum dry for 12 hours to obtain a white solid powder which is the curing agent for amino-terminated epoxy resin , stored in a vacuum desiccator for later use.

Embodiment 2

[0022] Add 292g of 1,3-bis(4'-aminophenoxy)benzene into a three-necked flask, add an appropriate amount of organic solvent, blow nitrogen, and stir at room temperature until 1,3-bis(4'-aminophenoxy)benzene is completely dissolve. Add 109 g of pyromellitic dianhydride into the above-mentioned three-necked flask, control the reaction temperature at 30° C., and stir for 5 hours to obtain a light yellow transparent liquid. Drop the obtained light yellow transparent liquid into deionized water, stir to obtain a white turbid suspension, wash and filter with suction to obtain a white filter cake, put it in 30°C and vacuum dry for 12 hours to obtain a white solid powder which is the curing agent for amino-terminated epoxy resin , stored in a vacuum desiccator for later use.

Embodiment 3

[0024] Add 432g of 4,4'-bis(3-aminophenoxy)diphenyl sulfone into a three-necked flask, add an appropriate amount of organic solvent, blow nitrogen, and stir at room temperature until 4,4'-bis(3-aminophenoxy) Diphenylsulfone was completely dissolved. Add 260 g of bisphenol A diether dianhydride into the above-mentioned three-necked flask, control the reaction temperature at 30° C., and stir for 5 hours to obtain a light yellow transparent liquid. Drop the obtained light yellow transparent liquid into deionized water, stir to obtain a white turbid suspension, wash and filter with suction to obtain a white filter cake, put it in 30°C and vacuum dry for 12 hours to obtain a white solid powder which is the curing agent for amino-terminated epoxy resin , stored in a vacuum desiccator for later use.

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Abstract

The invention provides a method for synthesizing an end-amino epoxy resin toughening type curing agent, and aims at solving the technical problems of effectively improving the toughness and the impact strength of a resin casting body and composites thereof. The method particularly comprises the steps that 2 mol of aromatic diamine containing ether bonds is added into a three-neck flask, nitrogen is fed, and stirring at room temperature is conducted till the aromatic diamine containing the ether bonds is completely dissolved in organic solvent; 1 mol of aromatic dianhydride is added, the temperature is controlled to be 30 DEG C, and stirring is conducted for five hours to obtain yellowish transparent liquid; the yellowish transparent liquid is dropwise added to deionized water, stirring is conducted to obtain white turbid suspension, washing and suction filtration are conducted, and a white filter cake, namely, the end-amino epoxy resin toughening type curing agent, is obtained. According to the method for synthesizing the end-amino epoxy resin toughening type curing agent, the synthesis technology is simple, and operation is convenient; the aromatic diamine containing the ether bonds and the aromatic dianhydride are adopted to synthesize end-amino polyamide acid on the condition that the molar ratio is two to one; due to the fact that amido of the end-amino polyamide acid can conduct the prepolymerization reaction with epoxy groups of epoxy resin, the polyamide acid is introduced to the molecular structure of the epoxy resin, the toughening effect is achieved, and the impact strength of the composites is increased by 20 percent.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and composite materials thereof, and relates to a synthesis method of an amine-terminated epoxy resin curing agent. Background technique [0002] Epoxy resin has the advantages of excellent mechanical properties, bonding properties, electrical insulation properties and corrosion resistance, and is widely used in coatings, adhesives, electronic potting materials, composite materials and other fields. However, epoxy resin has disadvantages such as brittleness, poor fracture toughness, and easy cracking after curing, which limits its application in high-performance fields. Therefore, the research on the toughening modification of epoxy resin has very important theoretical significance and application value. Commonly used rubber elastomer toughened epoxy resin will significantly lower its glass transition temperature. [0003] Using thermoplastic resin to modify epoxy resin has better effe...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08G59/50
Inventor 钱建华刘坐镇吕晓平付建辉黄锐
Owner HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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