Liquid aromatic amine epoxy resin curing agent and preparation method thereof

An aromatic amine epoxy resin, aliphatic epoxy resin technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxyl compounds, etc. Achieve good high temperature mechanical properties, avoid polymerization, and reduce toxicity

Inactive Publication Date: 2012-07-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the aromatic amine epoxy resin curing agents currently used in industry, such as: diaminodiphenylmethane, diaminodiphenyl ether, m-phenylenediamine and other aromatic amines, are solids with high melting points, and must be It can only be miscible with epoxy at a relatively high temperature, so it is inevitable to have a certain degree of polymerization reaction with epoxy resin during the mixing process, resulting in a rapid increase in the viscosity of the material, which affects the subsequent process operations such as degassing and impregnation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Components of liquid aromatic amine epoxy resin curing agent: 3,3'-dimethyl 4,4'-diaminodiphenylmethane 75kg; butyl glycidyl ether 25kg.

[0012] In a 100L reactor, put 75kg of 3,3'-dimethyl 4,4'-diaminodiphenylmethane, keep it at 170-180°C until the material melts, start stirring, drop to 150±3°C in three batches Slowly add 25kg of butyl glycidyl ether, the reaction is exothermic when the butyl glycidyl ether is added dropwise, and then drop into the next batch after the exotherm is stable; after the addition, stir for 1 to 2 hours, drop to 50 to 60°C, and 100-mesh filter cloth to filter the material to obtain the liquefied 3,3'-dimethyl 4,4'-diaminodiphenylmethane epoxy resin curing agent, which is a brown transparent liquid at room temperature and has a viscosity of 1200 at 25°C. ~1300mPa·s, amine value 620~650mgKOH / g.

Embodiment 2

[0014] Components of liquid aromatic amine epoxy resin curing agent: 50 kg of 4,4'-diaminodiphenylmethane, 35 kg of m-phenylenediamine; 15 kg of neopentyl glycol diglycidyl ether.

[0015] In a 100L reactor, put 50kg of 4,4'-diaminodiphenylmethane and 35kg of m-phenylenediamine, keep it at 100-110°C until the materials are completely melted, start stirring, and slowly divide it into two batches when it drops to 75±3°C 15 kg of neopentyl glycol diglycidyl ether was added dropwise. After the addition, stir for 1-2 hours, lower to 40-50°C, filter the material with a 100-mesh filter cloth, and obtain a liquefied mixture of 4,4'-diaminodiphenylmethane and m-phenylenediamine. The epoxy resin is cured It is a brownish-red transparent liquid at room temperature, with a viscosity of 1500-1600mPa·s at 25°C and an amine value of 1200-1250mgKOH / g.

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Abstract

The invention discloses a liquid aromatic amine epoxy resin curing agent and a preparation method thereof. The liquid aromatic amine epoxy resin curing agent comprises the following components by weight percentage: 70-98 percent of solid aromatic amine and 2-30 percent of low-viscosity aliphatic epoxy resin. The preparation method comprises the following steps of: adding solid aromatic amine with a weight percentage of 70-98 percent in a reaction vessel, raising the temperature to a melting point above, starting an agitator after the material is molten, reducing the temperature to a melting point plus or minus 3 DEG C and dripping the low-viscosity aliphatic epoxy resin with a weight percentage of 2-30 percent for 2-3 batches through an overhead tank; agitating and reacting for 1-2 hours after the end of dripping, reducing the temperature to 50-60 DEG C, and filtering and discharging to obtain the liquid aromatic amine epoxy resin curing agent. The liquid aromatic amine epoxy resin curing agent and the preparation method thereof have the beneficial effects that the liquid aromatic amine epoxy resin curing agent prepared according to the invention can be mutually dissolved with the epoxy resin nearby the room temperature, the quicker polymerization reaction of the aromatic amine with the epoxy resin in the rubber mixing process can be avoided, and the characteristics of small toxicity, excellent curing substance heat resistance and good high-temperature mechanical property of the aromatic amine curing agent are kept.

Description

technical field [0001] The invention relates to a liquid aromatic amine epoxy resin curing agent at room temperature and a preparation method thereof. Background technique [0002] Because the epoxy resin cured product using aromatic amine as curing agent has excellent heat resistance, adhesion and high temperature mechanical properties, aromatic amine epoxy resin curing agent is widely used in high temperature resistant adhesives, epoxy casting resin, Epoxy resin composites and other material fields. However, most of the aromatic amine epoxy resin curing agents currently used in industry, such as: diaminodiphenylmethane, diaminodiphenyl ether, m-phenylenediamine and other aromatic amines, are solids with high melting points, and must be Only at a higher temperature can it be miscible with epoxy resin, so it is inevitable to have a certain degree of polymerization reaction with epoxy resin during the mixing process, resulting in a rapid increase in the viscosity of the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C07C213/04C07C217/28
Inventor 饶保林
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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