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Non-yellowing polyurethane one-component moisture curing agent and preparation method thereof

A moisture curing agent, polyurethane single technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of affecting product color and performance, unable to meet long-term use, easy oxidation, yellowing, etc., to achieve low equipment cost, The effect of uniform molecular weight distribution and not easy to age

Inactive Publication Date: 2019-03-22
广东聚盈化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the curing agent produced in China generally has a high content of free isocyanate toxic monomers, with a content of 3-5%, which does not meet the national mandatory standard GB18581-2001 "Limits of Harmful Substances in Solvent-Based Wood Coatings for Interior Decoration Materials" Polyurethane coating free isocyanate Regulations on the content of toxic monomers
[0004] Moreover, since the raw materials in the one-component moisture curing agent contain benzene, azo, carbon-carbon double bonds and other easy-yellowing groups, they are easy to oxidize and turn yellow in the air, affecting the color and performance of the product, affecting the aesthetics, and cannot meet the long-term requirements. use requirements

Method used

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  • Non-yellowing polyurethane one-component moisture curing agent and preparation method thereof
  • Non-yellowing polyurethane one-component moisture curing agent and preparation method thereof
  • Non-yellowing polyurethane one-component moisture curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]233.3g hexamethylene diisocyanate trimer, 8g trimethylolpropane, 158.5g hydroxy acrylic resin prepolymer, 600g ethyl acetate, 0.2g tetra[beta-(3,5-di-tert-butyl- 4-Hydroxyphenyl)propionic acid] pentaerythritol ester, 0.2g defoamer and 0.2g leveling agent were mixed, preheated at 60°C for 2h, then heated at 80°C for 4h, cooled to After 60°C, filter and discharge to obtain a one-component moisture curing agent for non-yellowing polyurethane.

[0047] In Example 1, the hydroxy acrylic resin prepolymer was prepared by the following method: 30% of ethyl acrylate, 30% of ethyl methacrylate, 15% of hydroxyethyl acrylate, 20% of hydroxybutyl acrylate and di-tertiary peroxide 4% amyl group was mixed, heated at 125°C for 6 hours, cooled to 90°C, 1% hydroquinone was added, and the residual monomer was removed by vacuuming to obtain a hydroxyacrylic resin prepolymer.

Embodiment 2

[0049] 233.3g hexamethylene diisocyanate trimer, 8g methyl propylene glycol, 158.5g hydroxy acrylic resin prepolymer, 600g butyl acetate, 0.2g tetra[beta-(3,5-di-tert-butyl-4- Hydroxyphenyl)propionic acid] pentaerythritol ester, 0.2g defoamer and 0.2g leveling agent were mixed, preheated at 60°C for 2h, then heated at 80°C for 4h, cooled to 60°C Then, filter and discharge to obtain a one-component moisture curing agent for non-yellowing polyurethane.

[0050] In Example 2, the hydroxyacrylic resin prepolymer was prepared by the following method: methyl acrylate 25%, ethyl methacrylate 40%, hydroxyethyl methacrylate 15%, hydroxybutyl acrylate 17% and peroxide Di-tert-amyl 2.5% was mixed, heated at 125°C for 6 hours, cooled to 90°C, added with 0.5% hydroquinone, and vacuumed to remove residual monomers to obtain a hydroxyacrylic resin prepolymer.

Embodiment 3

[0052] 231.9g hexamethylene diisocyanate trimer, 10.5g neopentyl glycol, 157.5g hydroxy acrylic resin prepolymer, 600g ethyl acetate, 0.2g tetra[beta-(3,5-di-tert-butyl- 4-Hydroxyphenyl)propionic acid] pentaerythritol ester, 0.2g defoamer and 0.2g leveling agent were mixed, preheated at 60°C for 2h, then heated at 80°C for 4h, cooled to After 60°C, filter and discharge to obtain a one-component moisture curing agent for non-yellowing polyurethane.

[0053] In Example 3, the hydroxyacrylic resin prepolymer was prepared by the following method: mixing 70% methyl methacrylate, 28% ethyl hydroxyacrylate and 1.5% di-tert-amyl peroxide, and heating at 125°C The reaction was carried out for 6 h, the temperature was lowered to 90° C., 0.5% hydroquinone was added, and the residual monomer was removed by vacuuming to obtain a hydroxyacrylic resin prepolymer.

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Abstract

The invention discloses a non-yellowing polyurethane one-component moisture curing agent and a preparation method thereof. The non-yellowing polyurethane one-component moisture curing agent is prepared from the following raw materials by weight percent: 18-25% of a hexamethylene diisocyanate derivative, 0-5% of polyol, 8-18% of a hydroxyl acrylic resin prepolymer, 55-65% of an ester solvent and 0-5% of other additives. The non-yellowing polyurethane one-component moisture curing agent product provided by the invention is more uniform in molecular weight distribution, better in comprehensive performance and fewer in free isocyanate toxic monomers; the product produced by branching of hydroxyl acrylic resin not only has the characteristics, such as adhesion, acid and alkali resistance and gloss retention, of the hydroxyl acrylic resin, but also has the weather resistance, wear resistance and the like of polyurethane, and does not yellow after being used for a long time. The preparation method is simple, no post-treatment is needed, and general production equipment can be used for production without needing addition of new equipment; the preparation method has the characteristics of being low in equipment cost and simple to operate; furthermore, a large amount of energy does not need to be used in a treatment process, so that the moisture curing agent is environment-friendly.

Description

technical field [0001] The invention belongs to the field of polyurethane coatings, in particular to a non-yellowing polyurethane one-component moisture curing agent and a preparation method. Background technique [0002] In the coating industry, polyurethane coatings can be divided into one-component moisture-curing polyurethane and two-component polyurethane according to their composition. Among them, the one-component moisture curing agent polyurethane is formed by the reaction of water in the air and a prepolymer containing isocyanate groups to form a film, which has the advantages of convenient use, long activation life, low temperature curing, low surface treatment primer, moisture sensitivity The advantages of low temperature, fast surface drying, short overcoating interval and multi-season construction make it occupy a very important position in the field of polyurethane coatings. These efficient production features increase project construction and control flexibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/65C08G18/32C08G18/62C08G18/30C09D175/04
CPCC08G18/307C08G18/3206C08G18/6229C08G18/6517C08G18/792C09D175/04
Inventor 李恭超颜六廷
Owner 广东聚盈化工有限公司
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