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Epoxy resin curing agent preparation method

A technology of epoxy resin curing and novolac epoxy resin, which is applied in the field of chemical materials, can solve the problems of long application time and good compatibility, and achieve the effects of long application time, good compatibility and improved mechanical properties

Inactive Publication Date: 2014-04-02
张锦碧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The curing agent has good compatibility after mixing with epoxy resin. It has a long application time at room temperature and can be cured quickly after heating. Applying it to paper can greatly improve the mechanical properties of paper. Related patents have not yet been issued in China. see application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of curing agent for epoxy resin, the parts by weight of its components are:

[0023] 25 parts of diethanolamine, 28 parts of novolak epoxy resin, 11 parts of neutralizer, 23 parts of aromatic polyamine.

[0024] A kind of preparation method of epoxy resin curing agent, its preparation process comprises:

[0025] First, use diethanolamine to open the novolac epoxy resin by 15% at a temperature of 60°C, and the reaction time is 1h, and then carry out the addition reaction of the modified epoxy resin and aromatic polyamine: the titration temperature of neutralizer and aromatic polyamine is 45 ℃, aromatic polyamine / epoxy group (ratio by weight) = 1:1, reaction temperature 55 ℃, reaction time 1.2h; finally, the obtained organic solution was phase-inverted under high-speed stirring at a speed of 1600rpm, and finally the average particle size was obtained. A stable emulsion with a diameter of 85nm.

Embodiment 2

[0027] A kind of curing agent for epoxy resin, the parts by weight of its components are:

[0028] 28 parts of diethanolamine, 30 parts of novolac epoxy resin, 12 parts of neutralizer, and 23 parts of aromatic polyamine.

[0029]

[0030] A kind of preparation method of epoxy resin curing agent, its preparation process comprises:

[0031] First, use diethanolamine to open the novolak epoxy resin by 20% at a temperature of 70 ° C, and the reaction time is 2 hours, and then carry out the addition reaction of the modified epoxy resin and aromatic polyamine: the titration temperature of neutralizer and aromatic polyamine is 55 ℃, aromatic polyamine / epoxy group (weight ratio) = 1:1.2, reaction temperature 60 ℃, reaction time 2h; finally, the obtained organic solution was phase-inverted under high-speed stirring at a speed of 2000rpm, and the average particle size was finally obtained A stable emulsion of 90nm.

Embodiment 3

[0033] A kind of curing agent for epoxy resin, the parts by weight of its components are:

[0034] 30 parts of diethanolamine, 30 parts of novolac epoxy resin, 13 parts of neutralizer, and 28 parts of aromatic polyamine.

[0035]

[0036] A kind of preparation method of epoxy resin curing agent, its preparation process comprises:

[0037] First, use diethanolamine to open the novolac epoxy resin by 30% at a temperature of 90°C, and the reaction time is 3 hours, and then carry out the addition reaction of the modified epoxy resin and aromatic polyamine: the titration temperature of neutralizer and aromatic polyamine is 50 °C, aromatic polyamine / epoxy group (weight ratio) = 1:1.5, reaction temperature 70 °C, reaction time 3 h; finally, the obtained organic solution was phase-inverted under high-speed stirring at a speed of 2300 rpm, and the average particle size was finally obtained 100nm stable emulsion.

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Abstract

The invention relates to an epoxy resin curing agent preparation method. An epoxy resin curing agent consists of the following components by weight: 20-40 parts of diethanol amine, 25-35 parts of phenol epoxy resin, 10-14 parts of neutralizer and 20-30 parts of aromatic polyamines. The preparation process comprises the steps of opening the phenol epoxy resin by 10-50 percent through the diethanol amine at the temperature of 50-100 DEG C, generating reaction for 1-5 hours, and then generating addition reaction between the modified epoxy resin and the aromatic polyamines, wherein the titration temperature for the neutralizer and the aromatic polyamines is 40-70 DEG C, the weight ratio of the aromatic polyamines to the epoxy group is (1:1)-(1:3), the reaction temperature is 50-90 DEG C, and the reaction time is 1-4 hours; finally stirring an obtained organic solution at high rotating speed of 1,500-3,000 rpm for phase inversion to obtain a stable emulsion of which the average particle size is 80-150nm. After being cured, the epoxy resin is high in coating weatherability and high in hardness.

Description

technical field [0001] The invention relates to a method for preparing an epoxy resin curing agent, in particular to an epoxy resin curing agent with good coating film weather resistance and high hardness, which belongs to the field of chemical materials. Background technique [0002] Epoxy resin itself has a thermoplastic linear structure. After being heated, the solid resin can soften and melt, and become viscous or liquid; the viscosity of liquid epoxy resin decreases after heating; only after adding a curing agent to cure, the epoxy resin can be used. . A complete conceptual epoxy resin composition system should be composed of four components: one: resin components (epoxy resin and curing agent), two: modified components (plasticizers, tougheners and fillers), three: Adjust fluidity components (diluents and thixotropic agents), four: other components. In actual application, it is not necessary to have all four components at the same time, but the curing agent in the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08G59/40
Inventor 张锦碧
Owner 张锦碧
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