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Environment-friendly polyurethane curing agent and its preparation method and application

A polyurethane curing agent, environmentally friendly technology, used in polyurea/polyurethane coatings, organic chemistry, coatings, etc., can solve the problems of low free TDI content polyurethane curing agent, etc., to achieve easy industrial application, high NCO value, matting Good results

Active Publication Date: 2017-06-06
CARPOLY CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For now, there is no polyurethane curing agent that satisfies comprehensive properties such as good matting, high solid content, high NCO value, low free TDI content, appropriate viscosity, and good tolerance in the prior art.

Method used

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  • Environment-friendly polyurethane curing agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A. The mixed alcohol of 60kg trimethylolpropane and 20kg methylol propane is heated to 120 ℃ of dehydration 2 hours, stand-by, wherein, the mol ratio of methylol propanediol and trimethylol propane in the described mixed alcohol is 1: 2;

[0042]Under the protection of nitrogen, 213kg of butyl acetate and 2,4-toluene diisocyanate and 2,6-toluene diisocyanate (wherein the mass ratio of 2,4-toluene diisocyanate is 69%) 610kg into the reaction kettle Stir evenly and heat up to 42°C, then drop the dehydrated mixed alcohol into the reaction kettle for 1 hour, and keep the temperature between 66-78°C, the NCO group in the diisocyanate monomer The molar ratio of the group to the OH group in the mixed alcohol is 3.92~1;

[0043] After the dropwise addition is completed, after 1 hour of insulation at 70°C and 1 hour of insulation at 80°C, the mass of diisocyanate monomer in the gas chromatography measurement system is about 290kg, and 0.3kg of tris-(dimethylaminomethyl)phenol i...

Embodiment 2

[0046] A. Heat the mixed alcohol of 50kg trimethylolpropane and 21kg 1,4-butanediol to 120°C for dehydration for 1.5 hours, and set aside for use, wherein, in the mixed alcohol, 1,4-butanediol and trimethylol The molar ratio of propane is 1:1.6;

[0047] Under the protection of nitrogen, 195kg of propylene glycol methyl ether acetate and 2,4-toluene diisocyanate and 2,6-toluene diisocyanate (wherein, the mass ratio of 2,4-toluene diisocyanate is 73%) 530kg input Stir evenly in the reaction kettle and heat up to 50°C, then drop the dehydrated mixed alcohol into the reaction kettle for 1 hour and 10 minutes, and maintain the temperature between 65-81°C, the diisocyanate monomer The molar ratio of the NCO group in the mixed alcohol to the OH group in the mixed alcohol is 3.832:1;

[0048] After the dropwise addition, keep warm at 70°C for 1 hour, and keep warm at 80°C for 1 hour. After the heat preservation is completed, the mass of the diisocyanate monomer in the system is dete...

Embodiment 3

[0051] A. Heat 80kg of trimethylolpropane and 33kg of 1,3-propanediol to 150°C for dehydration for 2.5 hours, and set aside for use, wherein the molar ratio of 1,3-propanediol to trimethylolpropane in the mixed alcohol is 1 :1.4;

[0052] Under the protection of nitrogen, 300kg of n-propyl acetate and 2,4-toluene diisocyanate and 2,6-toluene diisocyanate (wherein the mass ratio of 2,4-toluene diisocyanate is 59%) 720kg into the reaction Stir evenly in the kettle and heat up to 65°C, then drop the dehydrated mixed alcohol into the reaction kettle for 1.5 hours, and maintain the temperature between 69 and 79°C, the NCO in the diisocyanate monomer The molar ratio of the group to the OH group in the mixed alcohol is 3.05:1;

[0053] After the dropwise addition, keep warm at 70°C for 1 hour, and keep warm at 80°C for 1 hour. After the heat preservation is completed, the mass of the diisocyanate monomer in the system is determined by gas chromatography to be about 260kg, and 0.45kg...

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Abstract

The invention discloses an environment-friendly polyurethane curing agent as well as a preparation method and the application of the curing agent. The preparation method of the environment-friendly polyurethane curing agent comprises the following steps: dehydrating the mixed alcohol of dihydric alcohol and trimethylolpropane, and then dropwise adding the mixed alcohol to a preheated ester solvent and a diisocyanate monomer under the protection of nitrogen, wherein the molar ratio of an NCO group in the diisocyanate monomer and an OH group in the mixed alcohol is (3-6): 1; after a thermal insulation reaction, adding an isocyanate trimer catalyst for catalyzing trimerization, terminating the reaction until the NCO value in the reaction liquid is found to fall to the range of 15% to 20%, and then removing the reaction solvent and the left diisocyanate monomer in the intermediate product, thereby obtaining the environment-friendly polyurethane curing agent. The environment-friendly polyurethane curing agent prepared by use of the method is capable of simultaneously meeting the property requirements of good matting property, high solid content, high NCO value, low free TDI content, appropriate viscosity, good tolerance and the like, and is excellent in comprehensive properties.

Description

technical field [0001] The invention relates to the field of curing agents, in particular to an environment-friendly polyurethane curing agent and its preparation method and application. Background technique [0002] Polyurethane coating is a new type of material developed in the second half of the 20th century. Because its structure contains not only urethane bonds, but also ester bonds, ether bonds, urea bonds, biuret bonds, and urea groups. Formate bond, acyl urea bond and unsaturated bond of oil, therefore, it not only has the characteristics similar to amide group, such as strength, wear resistance, oil resistance, but also has the heat resistance and solvent resistance of polyester, and polyester Ether for water resistance and flexibility. In addition, isocyanate, the main raw material of polyurethane, is very active. It can not only combine with hydroxyl resin, but also combine with hydroxyl in the substrate to form strong chemical bonds and hydrogen bonds, which enh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/32C08G18/16C08G18/18C08G18/02C09D175/04C07D251/30
CPCC07D251/30C08G18/02C08G18/168C08G18/1808C08G18/1816C08G18/3206C08G18/7628C09D175/04
Inventor 殷代武谭卉文徐绍君曹树坤黄洪陈荣华
Owner CARPOLY CHEM GRP
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