Method for preparing high performance urethane elastomer for thermal barrier coating

A technology of polyurethane elastomer and thermal insulation coating, which is used in polymer materials and aerospace fields, can solve the problems of small solid filling, poor hydrolysis resistance, poor heat resistance, etc., and achieves small solid filling, strong hydrolysis resistance, adhesion Good junction performance

Active Publication Date: 2009-02-04
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of polyester polyurethane are poor hydrolysis resistance, high viscosity, strong rigidity, and small solid filling; the disadvantage of polyether polyurethane is poor heat resistance. The products are mainly used in automobiles, construction, mines and shoes, etc.

Method used

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  • Method for preparing high performance urethane elastomer for thermal barrier coating
  • Method for preparing high performance urethane elastomer for thermal barrier coating
  • Method for preparing high performance urethane elastomer for thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of prepolymer: Add 2976 grams of hydroxyl-terminated polybutadiene liquid rubber to a 5-liter three-necked bottle, heat to 105±5°C, vacuumize for 30 minutes (vacuumize at high temperature to further remove moisture), and then cool down to 60 ℃ (to prevent the initial temperature of the reaction from being too high to cause implosion), add 550 grams of toluene diisocyanate (the OH / NCO molar ratio is 1:0.28), raise the temperature to 80 ℃, and react at constant temperature for 30 minutes; add polyurethane to strengthen Type II agent 124 grams, warming up to 85 ° C, constant temperature reaction 4.0h, then vacuum (dehydration and degassing) 30min, to obtain the isocyanate-terminated liquid rubber prepolymer (the NCO content in the obtained isocyanate-terminated liquid rubber prepolymer is 5.41%), cooled and discharged; then added 3186 grams of dried heat-insulating functional filler, and mixed to obtain a composite prepolymer (ie component A). The heat-insulati...

Embodiment 2

[0032] Preparation of prepolymer: Add 3136 grams of hydroxyl-terminated polybutadiene liquid rubber to a 5-liter three-necked bottle, heat to 105±5°C, vacuumize for 30 minutes, then cool down to 60°C, add 566 grams of toluene diisocyanate (its OH / NCO molar ratio 1:0.24), heat up to 83°C, and react at a constant temperature for 30 minutes; then add 64 grams of polyurethane reinforcing agent Type II, heat up to 88°C, and react at a constant temperature for 4.5 hours; then vacuumize for 30 minutes to obtain an isocyanate-terminated liquid rubber The prepolymer (the NCO content in the obtained isocyanate-terminated liquid rubber prepolymer is 5.08%) is cooled and discharged. Add 3,390 grams of dried heat-insulating functional filler, and mix well to obtain a composite prepolymer (ie, component A). The heat-insulating filler is an equal weight mixture of hollow glass beads, anatase titanium dioxide and light calcium carbonate.

[0033]Preparation of curing agent: 70 grams of 1,4 ...

Embodiment 3

[0037] Preparation of prepolymer: add 3217.5 grams of hydroxyl-terminated polybutadiene liquid rubber to a 5-liter three-neck flask, heat to 105±5°C, vacuumize for 30 minutes, then cool down to 60°C, add 4,4,-diphenyl 585.4 grams of methane diisocyanate (the OH / NCO molar ratio is 1:0.31), heated up to 83°C, and reacted for 20 minutes; then added 82.5 grams of polyurethane reinforcing agent type II, heated up to 87°C, reacted at constant temperature for 4.0 hours, and then evacuated for 40 minutes , to obtain the isocyanate-terminated liquid rubber prepolymer (the content of NCO in the obtained isocyanate-terminated liquid rubber prepolymer is 5.26%), cooling and discharging. Then add 3,310 grams of dried heat-insulating functional filler, and mix well to obtain a composite prepolymer (ie, component A). The heat-insulating filler is an equal weight mixture of hollow glass beads, anatase titanium dioxide and light calcium carbonate.

[0038] Preparation of curing agent: 75 gram...

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Abstract

The invention provides a preparation method of a thermal insulation coating high-performance polyurethane elastomer. After the reaction of terminal hydroxyl polybutadiene liquid rubber and polyisocyanate, polyurethane is added for reaction for 3 to 4.5 hours at 85 to 90 DEG C to produce isocyanate-terminated prepolymer; a certain amount of heat insulating filler is added in the prepolymer and is mixed evenly to produce component A; chain extender, antioxidant, curing agent and solvent are mixed evenly according to a certain portion to produce component B; the component A and the component B with the weight portion of 3: 1 to 6: 1 are mixed, stirred evenly, cured at room temperature to produce the thermal insulation coating high-performance polyurethane elastomer. The process of the invention used to synthesize the thermal insulation coating high-performance polyurethane elastomer is more reasonable, the product has higher quality and better comprehensive properties. The test date shows that the tensile strength is 3.50 to 5.80MPa, the elongation at break is more than 220 percent, the bond strength is more than 10.0MPa, the glass transition temperature is less than 60 DEG C below zero, the solidification shrinkage rate is less than 0.1 percent. The product is mainly applicable to aerospace industry.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to the preparation of a high-performance polyurethane elastomer, in particular to the preparation of a high-performance polyurethane elastomer for heat-insulating coatings, which is mainly used in aerospace and other fields. Background technique [0002] When the flying object passes through the dense atmosphere at a very high speed, due to the compression and friction of the surrounding air, a large amount of heat energy will be generated, which will cause the deformation of the flying object shell and affect the performance of the flying object. Therefore, a durable The polyurethane material with good abrasion resistance, high temperature resistance and good bonding performance with the base material of the flying object is used as a coating to protect the flying object. As a film-forming material for thermal insulation coatings, it is required to have high and low tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K13/04C08K7/28C08K3/22C08K3/26C08G18/69C09D175/14C09D5/00
Inventor 于晶胡少坤高艳胡开放齐永新潘广勤孟凡宁陈继明
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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