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Formula and synthesis method of high-functionality enclosed type waterborne cationic isocyanate curing agent

A blocked isocyanate, high-functionality technology, applied in electrophoretic coatings, coatings, etc., can solve the problems of easy precipitation, delamination, poor stability, etc., and achieve high functionality, fast curing, and simple and easy-to-obtain effects

Inactive Publication Date: 2018-08-21
东莞市同丰高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of oily curing agent used in electrophoretic paint in the prior art. The curing agent is dispersed in water after being wrapped by resin, which is prone to poor stability, precipitation and layering, etc., and proposes a water-based cationic Formula and synthetic method of high-functionality blocked isocyanate curing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The formulation of a water-based cationic high-functionality blocked isocyanate curing agent proposed by the present invention includes the following raw materials in parts by weight: 1737 parts of HDI, 149 parts of methyldiethanolamine, 261 parts of caprolactam, and lactic acid.

[0024] Its synthetic method comprises the following steps:

[0025] S1. Accurately weigh the HDI trimer, methyldiethanolamine, caprolactam, and lactic acid in the above parts by weight, and set aside;

[0026] S2, adding the HDI trimer in step S1 to the reactor;

[0027] S3. Add a certain amount of solvent to the reaction kettle in step S2, and heat up to 70°C;

[0028] S4. On the basis of step S3, slowly add the methyldiethanolamine in step S1 to the reactor through a constant pressure dropping funnel, and the addition is completed within 2 hours;

[0029] S5. Insulating the mixture obtained in step S4 for 3 hours;

[0030] S6. After step S5 is completed, slowly add the caprolactam in ste...

Embodiment 2

[0034] The formulation of a water-based cationic high-functionality blocked isocyanate curing agent proposed by the present invention comprises the following raw materials in parts by weight: 1737 parts of IPDI, 149 parts of methyldiethanolamine, 261 parts of methyl ethyl ketone oxime, and acetic acid.

[0035] Its synthetic method comprises the following steps:

[0036] S1. Accurately weigh the IPDI trimer, methyldiethanolamine, methyl ethyl ketone oxime, acetic acid in the above parts by weight, and set aside;

[0037] S2, adding the IPDI trimer in step S1 to the reactor;

[0038] S3. Add a certain amount of solvent to the reaction kettle in step S2, and heat up to 70°C;

[0039] S4. On the basis of step S3, slowly add the methyldiethanolamine in step S1 to the reactor through a constant pressure dropping funnel, and the addition is completed within 2 hours;

[0040] S5. Insulating the mixture obtained in step S4 for 3 hours;

[0041] S6. After step S5 is completed, slowl...

Embodiment 3

[0045] The formulation of a water-based cationic high-functionality blocked isocyanate curing agent proposed by the present invention comprises the following raw materials in parts by weight: 1737 parts of IPDI, 149 parts of triethanolamine, 261 parts of methyl ethyl ketone oxime, and lactic acid.

[0046] Its synthetic method comprises the following steps:

[0047] S1. Accurately weigh the IPDI trimer, triethanolamine, methyl ethyl ketone oxime, and lactic acid in the above parts by weight, and set aside;

[0048] S2, adding the IPDI trimer in step S1 to the reactor;

[0049] S3. Add a certain amount of solvent to the reaction kettle in step S2, and heat up to 70°C;

[0050] S4, on the basis of step S3, slowly add the triethanolamine amine in the step S1 to the reactor through a constant pressure dropping funnel, and the dropwise addition is completed within 2 hours;

[0051] S5. Insulating the mixture obtained in step S4 for 3 hours;

[0052] S6. After step S5 is complete...

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Abstract

The invention discloses a formula of a high-functionality enclosed type waterborne cationic isocyanate curing agent. The formula comprises raw materials in parts by weight as follows: 3-6 parts of a TDI, HDI or IPDI tripolymer, 1-2 parts of triethanolamine, diethanolamine or methyldiethanolamine, 3-6 parts of phenol, caprolactam or methyl ethyl ketoxime and lactic acid or acetic acid. The curing agent can solve the problems that existing electrophoretic paint is instable, easy to settle and layer and the like, can remarkably improve the paint film performance and can realize low-temperature and rapid curing. The invention also provides a synthesis method of the high-functionality enclosed type waterborne cationic isocyanate curing agent. The synthesis method is simple to operate, requiressimple and easily available materials and worth popularization.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to a formulation and a synthesis method of a water-based cationic high-functionality blocked isocyanate curing agent. Background technique [0002] With the development of society and the continuous improvement of people's awareness of environmental protection, water-based coatings are more and more favored by the market due to their advantages such as non-toxic, environmentally friendly, odorless, low VOC content, non-flammable and explosive. Curing agent, also known as hardening agent, curing agent or stabilizer, is a kind of substance or mixture that promotes or controls the curing reaction. Resin curing is through chemical reactions such as condensation, ring closure, addition or catalysis, so that the thermosetting resin undergoes an irreversible change process, and curing is completed by adding a curing (crosslinking) agent. Curing agent is an essential additive, whethe...

Claims

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Application Information

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IPC IPC(8): C09D7/63C09D5/44
CPCC09D5/44C09D7/63
Inventor 黄育朋
Owner 东莞市同丰高分子材料有限公司
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