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Polyisocyanates containing diphenyl-methane-group diisocyanate, and preparation method

A technology of diphenylmethane diisocyanate and polyisocyanate, applied in the field of polyisocyanate and its preparation, can solve problems such as high cost, harm to construction personnel and environment, high toxicity, etc., and achieves improved adhesion, multiple cross-linking points, high The effect of functionality

Inactive Publication Date: 2010-04-07
武汉壁千韧硅涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high toxicity of toluene diisocyanate itself, it is harmful to construction personnel and the environment. With the enhancement of people's environmental protection awareness, the application of toluene diisocyanate series curing agents will be limited in the future.
Hexamethylene diisocyanate series curing agents and isophorone diisocyanate series curing agents will take time to promote due to their high cost
[0010] The above-mentioned patents have defects in adhesion, weather resistance, etc., and excellent adhesion and good weather resistance are the problems that the industry needs to solve urgently. The present invention designs MDI polyisocyanate based on these considerations.

Method used

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  • Polyisocyanates containing diphenyl-methane-group diisocyanate, and preparation method
  • Polyisocyanates containing diphenyl-methane-group diisocyanate, and preparation method
  • Polyisocyanates containing diphenyl-methane-group diisocyanate, and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In a 500mL four-neck flask equipped with a thermometer, reflux condenser, stirring, and dropping funnel, at 0°C (ice-water mixed bath) and Ar gas protection, add 75g of MDI trimer, and dissolve it with 200g of ethyl acetate. Dissolve, slowly add 23.5g of N-butylaminopropyltrimethoxysilane and 0.085g of dibutyltin dilaurate dropwise, and react for 3h under stirring; then raise the temperature to 60°C and add 3g of 1,4-butanediol to continue the reaction 4 hours is enough. Part of the solvent was removed from the above product under reduced pressure to obtain a final product with a solid content of 90% and a viscosity of 1285 mPa.s.

Embodiment 2

[0042] In a 500mL four-necked flask equipped with a thermometer, a reflux condenser, stirring, and a dropping funnel, at room temperature 0°C (ice-water mixed bath) and under the protection of Ar gas, add 75g of MDI trimer, and dissolve it with 200g of ethyl acetate. It dissolves, slowly add 22.1g of aminopropyltriethoxysilane and 0.07g of dibutyltin dilaurate dropwise, and react for 3h under stirring; then raise the temperature to 60°C and add 2.3g of ethylene glycol, and continue the reaction for 4h. Part of the solvent was removed from the above product under reduced pressure to obtain a final product with a solid content of 90% and a viscosity of 1055 mPa.s.

Embodiment 3

[0044] In a 500mL four-neck flask equipped with a thermometer, reflux condenser, stirring, and dropping funnel, at room temperature and under the protection of Ar gas, add 75g of MDI trimer, dissolve it with 200g of ethyl acetate, and slowly add 19.6g of it dropwise. Mercaptotriethoxysilane and 0.07g of stannous octoate were reacted for 3h under stirring; then the temperature was raised to 60°C and 20g of polytetrahydrofuran ether polyol with a molecular weight of 500 was added, and the reaction was continued for 4h. Part of the solvent was removed from the above product under reduced pressure to obtain a final product with a solid content of 75% and a viscosity of 1418 mPa.s.

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Abstract

The invention provides polyisocyanates containing diphenyl-methane-group diisocyanate, and a preparation method. The polyisocyanate has a structure ad follows. The preparation method comprises: taking diphenyl-methane-group diisocyanate monomers and trimer products thereof as main isocyanate raw materials; allowing the main isocyanate raw materials to react with functional organic silicon compounds; and obtaining a series of polyisocyanates. The polyisocyanates can be used as paint, ink and curing agents of adhesive, and have low viscosity, quick-drying property, high hardness, good adhesive force and other excellent performances.

Description

technical field [0001] The present invention relates to a kind of polyisocyanate containing dibenzyl diisocyanate and its preparation method, specifically utilize the organic silicon compound containing functional group to react with 4,4'-dibenzyl diisocyanate and its trimer A novel polyisocyanate and a preparation method thereof are obtained. The polyisocyanate can be used as a curing agent in the fields of coatings, inks and adhesives, and can also be used in the field of polyurethane foam materials; meanwhile, it can also be used as a raw material for synthetic resins. Background technique [0002] One-component coatings (inks, adhesives) have defects such as poor water resistance and poor adhesion. Therefore, according to the current development trend of the industry, two-component coatings (inks, adhesives) will be the future The focus of the development of the coatings industry. At present, the research on the curing agent of one of the two-component components has b...

Claims

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Application Information

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IPC IPC(8): C07F7/18C08G18/79C09D175/04C03C17/30
Inventor 吴小峰张群朝王德才
Owner 武汉壁千韧硅涂料有限公司
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