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Curing agent 1,6- hexamethylene diisocyanate prepolymer and preparation thereof

A technology of hexamethylene diisocyanate and prepolymer, which is applied in 1 field, can solve the problems of complex post-treatment process and equipment, and achieve the effects of novel formula design, low energy consumption and low toxicity

Active Publication Date: 2008-10-01
周建明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, such a post-processing process and equipment are very complicated

Method used

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  • Curing agent 1,6- hexamethylene diisocyanate prepolymer and preparation thereof
  • Curing agent 1,6- hexamethylene diisocyanate prepolymer and preparation thereof
  • Curing agent 1,6- hexamethylene diisocyanate prepolymer and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] a, add 200 grams of 1,6-hexamethylene diisocyanate and 50 grams of ethyl acetate in the reactor, stir evenly, add 80 grams of polycarbonate diol through vacuum dehydration, stir coldly at room temperature for 0.5 hour, and heat up to Reaction at 60-70°C for 2 hours, and reaction at 80-90°C for 2 hours to obtain the HDI modified product. b. Cool down to 50°C, add dropwise a mixture of 47 grams of trimethylolpropane and 50 grams of ethyl acetate into the reaction kettle under stirring, at a temperature of 70-80°C, drop it in 2 hours, and keep it warm for reaction After 3 hours, the temperature was raised to 90-100°C for 2 hours, and then the temperature was lowered to 60°C. c. Add 9 grams of ethyl acetate solvent, stir evenly, and discharge to obtain 436 grams of HDI prepolymer curing agent with a solid content of 75%. The NCO content of the curing agent was detected to be 11.5% (15.3% based on total solids).

Embodiment 2

[0050] a. Add 200 grams of 1,6-hexamethylene diisocyanate into the reaction kettle, add 150 grams of hydroxy acrylic resin solution with a solid content of 50%, stir at room temperature for 0.5 hours, heat up to 60-70 ° C for 2 hours, 80 Reaction at ~90°C for 2 hours to obtain a modified HDI. b. Cool down to 70°C, add dropwise a mixture of 51 grams of trimethylolpropane and 30 grams of ethyl acetate into the reaction kettle under stirring, at a temperature of 80-90°C, drop it in 2 hours, and keep it warm for reaction After 3 hours, the temperature was raised to 90-100°C for 2 hours, and then the temperature was lowered to 60°C. c. Add 4 grams of butyl acetate solvent, stir evenly, and discharge to obtain 435 grams of HDI prepolymer curing agent with a solid content of 75% and a viscosity of 1300 mpa.s (25° C.). The NCO content of the curing agent was detected to be 12.9% (17.2% based on total solids).

[0051] Note: 1. The detection of solid content is carried out according ...

Embodiment 3

[0055] a. Add 300 grams of 1,6-hexamethylene diisocyanate and 50 grams of ethyl acetate in the reaction kettle, stir evenly, add 50 grams of polyε-caprolactone diol dehydrated by vacuum, and stir coldly at room temperature for 0.5 hours , the temperature was raised to 60-70°C for 3 hours, and 80-90°C for 1 hour to obtain a modified HDI. b. Cool down to 50°C, add dropwise a mixture of 90.8 grams of trimethylolpropane and 190.8 grams of ethyl acetate into the reaction kettle under stirring, at a temperature of 70-80°C, drop it in 3 hours, and keep it warm for reaction After 2 hours, the temperature was raised to 90-100°C for 3 hours, and then the temperature was lowered to 60°C. c. Add 200 grams of ethyl acetate solvent, stir evenly, and discharge to obtain 882 grams of HDI prepolymer curing agent with a solid content of 50%. The NCO content of the curing agent was detected to be 6.9% (13.8% based on total solids).

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Abstract

The invention provides a curing agent of 1, 6-hexamethylene diisocyanate prepolymer and a preparation method thereof. The preparation method comprises that: HDI and an organic solvent are put in a reaction vessel, stirred evenly and added with vacuumized and dehydrated polybasic alcohol; with cold mix for 0.5 hour at room temperature and reaction for 2 to 5 hours at temperature of 60 to 100 DEG C, an HDI modifier is prepared; then the temperature is decreased to 50 to 80 DEG C and while stirring, the mixed solution of trimethylolpropane and the organic solvent are added into the reaction vessel in drops for 1 to 4 hours at temperature of 60 to 100 DEG C; then the reaction is incubated for 1 to 3 hours with heat preservation; again the temperature is increased to 80 to 100 DEG C and the reaction is incubated for 2 to 5 hours with heat preservation; finally the transparent viscous fluid of HDI prepolymer is prepared with temperature decreased to 60 DEG C; the organic solvent is added into dilute the required solid content. The invention has good weather resisting property and non-yellowing property under ultraviolet radiation and high temperature, simple product preparation technique, the molecular structure of the curing agent being able to be regulated according to the requirement of users, and can acquire products of high solid content and other advantages.

Description

technical field [0001] The invention relates to a non-yellowing polyurethane coating, an adhesive curing agent prepolymer and a preparation method thereof, in particular to a 1,6-hexamethylene diisocyanate (HDI) prepolymer and a preparation method thereof. Background technique [0002] 1,6-Hexamethylene diisocyanate (HDI) belongs to non-yellowing aliphatic diisocyanate and is the main raw material for high-performance polyurethane coatings and adhesives. There will be no yellowing phenomenon under irradiation, and the chemical reaction of aromatic isocyanate into carcinogenic aromatic amine will not occur under high-temperature cooking conditions. Therefore, HDI is a very important raw material in isocyanate. my country's HDI raw materials have always relied on imports. In 2006, German Bayer Company built an HDI production line in Shanghai Chemical Industry Zone, which has been put into operation. The localization of HDI will promote the rapid development of weather-resistan...

Claims

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Application Information

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IPC IPC(8): C08G18/10C09D175/04
Inventor 周建明何绍群
Owner 周建明
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