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A kind of preparation method and application of nonionic water-based isocyanate curing agent

A water-based isocyanate and curing agent technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor resistance to hard water, limited use range, complex production process, etc., to improve hardness and water resistance, and reduce solvents High effect of use and reaction selectivity

Active Publication Date: 2021-10-22
深圳飞扬兴业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating synthesized by this type of method has good dispersion and paint film properties, but the anionic hydrophilic group has the following two disadvantages: 1) poor resistance to hard water, easy to break emulsion in hard water; 2) cannot be mixed with cationic solvents or auxiliary used in conjunction with agents, limiting its scope of use
For example, the solvent synthesis method (CN 105062188A, CN102816294A) needs to use acetone, methyl ethyl ketone, etc. as solvents, and has complex production processes, and the final product contains solvent impurities, and endangers the health of users.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of synthetic method of nonionic water-based isocyanate curing agent (WHDI-III):

[0044] Take 150g (1.5mol) of cyclohexylamine, slowly add it dropwise to 300g of polyethylene glycol monomethyl ether acrylate (average molecular weight 380), and then heat it to about 80°C under the condition of argon gas, and react for 10h to obtain intermediate. Heating to 110°C under reduced pressure to remove unreacted cyclohexylamine. Analyzed by gas chromatography, the conversion rate is about 95%. Residual cyclohexylamine was less than 3%. Then the intermediate and the HDI trimer were added to the HDI trimer according to the mass ratio of 3:1, and stirred and reacted for about 2 hours under the protection of argon. After the reaction, the non-ionic water-based isocyanate curing agent (WHDI-III) is obtained.

[0045] Measure the main performance of described nonionic water-based isocyanate curing agent (WHDI-III) as follows:

[0046] Appearance: viscous liquid;

[0047] ...

Embodiment 2

[0051] A kind of synthetic method of nonionic water-based isocyanate curing agent (WHDI-V):

[0052] Take 150g (1.5mol) of cyclohexylamine, slowly add it dropwise to 300g of polyethylene glycol monomethyl ether acrylate (average molecular weight 380), and then heat it to about 80°C under the condition of argon gas, and react for 10h to obtain intermediate. Analyzed by gas chromatography, the conversion rate is about 95%. Residual cyclohexylamine was less than 3%. The intermediate and HDI pentamer were added to the HDI pentamer at a mass ratio of 3:1, and stirred and reacted for about 2 hours under the protection of argon. After the reaction, the non-ionic water-based isocyanate curing agent (WHDI-V) is obtained.

[0053] Measure the main performance of described nonionic water-based isocyanate curing agent (WHDI-V) as follows:

[0054] Appearance: viscous liquid;

[0055] Color: colorless and transparent;

[0056] Viscosity: 10000-11000;

[0057] NCO value: 16-17.

Embodiment 3

[0059] A kind of synthetic method of nonionic waterborne isocyanate curing agent (WTDI):

[0060] Take 150g (1.5mol) of cyclohexylamine, slowly add it dropwise to 300g of polyethylene glycol monomethyl ether acrylate (average molecular weight 380), and then heat it to about 80°C under the condition of argon gas, and react for 10h to obtain intermediate. Analyzed by gas chromatography, the conversion rate is about 95%. Residual cyclohexylamine was less than 3%. Then the intermediate and TDI were added in a mass ratio of 2.5:1, TDI was added, and the reaction was stirred for about 3 hours under the protection of argon. After the reaction, the nonionic water-based isocyanate curing agent WTDI is obtained.

[0061] Measure the main performance of described nonionic water-based isocyanate curing agent WTDI as follows:

[0062] Appearance: viscous liquid;

[0063] Color: yellow;

[0064] Viscosity: 10000-11000;

[0065] NCO value: 21.

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PUM

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Abstract

The invention discloses a preparation method and application of a nonionic water-based isocyanate curing agent, and relates to the technical field of isocyanate curing agents. In the present invention, primary amines are introduced as synthetic bridges during the synthesis process, and two hydrogen atoms on the primary amines are used as active sites to connect hydrophilic groups and isocyanate groups. The use of solvents is reduced in the synthesis, the safety is high, and the process is simple. By adjusting the number of molecules of secondary amino groups and the number of molecules of isocyanate groups, products with different hydrophilic properties can be obtained. The paint provided by the invention helps to improve the hardness and water resistance of the paint by adding the nonionic water-based isocyanate curing agent, auxiliary agent and crosslinking agent.

Description

technical field [0001] The invention relates to the technical field of isocyanate curing agents, in particular to a preparation method of a nonionic water-based isocyanate curing agent and its application in the coating field. Background technique [0002] Traditional paints generally use oily organic solvents, which often contain volatile solvents, and even toxic and harmful substances such as benzene, toluene, xylene, formaldehyde, and free TDI, which bring more or less harm to the environment and human health. cause damage. After replacing the above-mentioned organic solvents with water, it has the advantages of cleanliness and environmental protection, and can effectively protect the health of construction workers and users. Water-based polyurethane coatings have the advantages of low VOC, non-combustible, green and environmental protection, etc., and have developed rapidly in the field of water-based coatings in recent years. Waterborne polyaspartate polyurea coatings...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/80C09D175/04C09D179/08C09D7/61
CPCC08G18/808C08K2003/2241C08K2201/011C09D175/04C09D179/08C09D7/61C08K3/04C08K3/36C08K3/22
Inventor 杨轩易松徐涛龙绪俭熊东路肖增钧李斌仁鲁晓东
Owner 深圳飞扬兴业科技有限公司