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Solvent-free closed colored polyisocyanate curing agent as well as preparation method and application thereof

A polyisocyanate, closed-type technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as high toxicity, high pollution, and strong odor, and achieve the effect of improving water resistance and improving physical and chemical properties

Inactive Publication Date: 2020-06-30
武汉仕全兴聚氨酯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention discloses a solvent-free blocked colored polyisocyanate curing agent and its preparation method and application. The curing agent solves the problems of high pollution, large odor and high toxicity of traditional solvent-type polyisocyanate curing agents

Method used

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  • Solvent-free closed colored polyisocyanate curing agent as well as preparation method and application thereof
  • Solvent-free closed colored polyisocyanate curing agent as well as preparation method and application thereof

Examples

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preparation example Construction

[0024] The invention discloses a preparation method of a solvent-free blocked colored polyisocyanate curing agent, which comprises the following steps:

[0025] 1) Preparation of modified polyisocyanate monomer (L)

[0026] Under the protection of nitrogen, add the polyisocyanate (A) and polymerization inhibitor (B) of the designed formula ratio into the four-port reactor equipped with a thermometer and a condenser, and heat it to 60-80°C with an electric heating mantle , slowly add enol or acrylate (C) dropwise for about 1 hour, keep warm for 2 to 4 hours, and then start to measure the NCO content. Isocyanate monomer (L).

[0027] 2) Preparation of modified polyisocyanate prepolymer (G)

[0028] Under nitrogen protection, place part of the modified polyisocyanate monomer (L) at the bottom of the reaction bottle, stir and mix the remaining modified polyisocyanate monomer (L) with the initiator (D), and slowly add it dropwise into the reaction bottle ( The dropwise addition ...

Embodiment 1

[0046] Under the protection of nitrogen, 952 parts of hexamethylene diisocyanate (HDI), 1.4 parts of polymerization inhibitor (p-hydroxymethyl anisole) are added with a thermometer and a condenser, in a four-port reactor with stirring, Heat to 60-80°C with an electric heating mantle, slowly add 489 parts of hydroxyethyl acrylate dropwise, finish dropping in about 1 hour, keep warm for 2-4 hours, and then start to measure the NCO content, when the NCO value is ≤21.24% (according to the experimental design , the NCO content when the hydroxyl group in the raw material is completely reacted accounts for the percentage of the total amount of the resin), the temperature is lowered and the material is discharged, and the modified polyisocyanate monomer is obtained.

[0047] Under nitrogen protection, place 289 parts of modified polyisocyanate monomers prepared above at the bottom of the reaction bottle, stir and mix 1152 parts of modified polyisocyanate monomers with 9 parts of azobis...

Embodiment 2

[0052] Under the protection of nitrogen, 1235 parts of hexamethylene diisocyanate (HDI), 1.2 parts of polymerization inhibitor (p-hydroxymethyl anisole) are added in a four-port reactor equipped with a thermometer and a condenser, with stirring, Heat it to 60-80°C with an electric heating mantle, slowly add 495 parts of hydroxyethyl methacrylate dropwise for about 1 hour, keep it warm for 2-4 hours, and then start to measure the NCO content. When the NCO value is ≤27.08% (according to Experimental design, the NCO content when the hydroxyl groups in the raw materials are completely reacted accounts for the percentage of the total amount of the resin), the temperature is lowered and the material is discharged, and the modified polyisocyanate monomer is obtained.

[0053] Under nitrogen protection, place 346 parts of modified polyisocyanate monomers prepared above at the bottom of the reaction bottle, stir and mix 1384 parts of modified polyisocyanate monomers with 9 parts of azob...

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Abstract

The invention discloses a solvent-free closed colored polyisocyanate curing agent as well as a preparation method and application thereof, and belongs to the technical field of coatings, wherein the polyisocyanate curing agent is prepared by modifying polyisocyanate with enol or acrylate, then carrying out copolymerization of unsaturated double bonds under the action of an initiator and blocking the remaining NCO with a blocking agent; the curing agent solves the problems of high pollution, strong smell, high toxicity and the like of a traditional solvent type polyisocyanate curing agent.

Description

technical field [0001] The invention relates to a polyisocyanate curing agent, which belongs to the technical field of coatings, in particular to a solvent-free blocked colored polyisocyanate curing agent and its preparation method and application. Background technique [0002] As one of the important raw materials of the polyurethane industry, isocyanate has many different types of products that have been practically applied in industry, and new products are constantly being launched. Isocyanate monomers have disadvantages such as high monomer toxicity, high reactivity, and easy reaction with nucleophiles (such as water), which make them require high environmental equipment during storage and use. At present, blocked isocyanate is one of the effective ways to solve these problems. Blocked isocyanate refers to the compound obtained by the reaction of isocyanate monomer or compound containing isocyanate group and compound containing active hydrogen. The synthesis of blocked...

Claims

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Application Information

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IPC IPC(8): C08G18/80C08F122/22C08F118/16C09D175/04
CPCC08F118/16C08F122/22C08G18/8077C09D175/04
Inventor 陈俊刘倩范亮亮焦海山苏平
Owner 武汉仕全兴聚氨酯科技有限公司
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