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Polyurethane elastomer for coating equipment and preparation method thereof

A polyurethane elastomer and coating equipment technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of inability to contact the solvent for a long time, complex preparation process, low solubility, etc., to improve the mechanical properties and resistance. Solvent performance, wide source, low cost effect

Active Publication Date: 2015-12-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent most used in the coating industry is methyl ethyl ketone with stronger solubility and lower toxicity. Therefore, this product cannot be used for coating equipment that has been exposed to solvents for a long time
[0009] The Chinese invention patent with the publication number CN103467973B discloses a method for preparing a low-hardness solvent-resistant polyurethane rubber roller. The product contains lead and mercury that may cause harm to the environment, and the preparation process is complicated.
[0010] Through the literature search and market survey of polyurethane high-hardness solvent-resistant elastomers, no solvent-resistant, high-hardness (≥Shore A90), low-cost, and green products suitable for the field of coating equipment have been found.

Method used

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  • Polyurethane elastomer for coating equipment and preparation method thereof
  • Polyurethane elastomer for coating equipment and preparation method thereof
  • Polyurethane elastomer for coating equipment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of polyurethane semi-prepolymer A component

[0038] Add 25g polybutylene adipate (molecular weight: 1500) and 5g castor oil polyester diol (molecular weight: 600, functionality: 2) into the reaction kettle, stir evenly, heat up to 110°C for vacuum dehydration to The water content in the system is below 0.02wt%; cool down to room temperature, add 52g of MDI-50 (a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate) into the reaction kettle, Reaction at 65°C for 1.5 hours to prepare a polyurethane semi-prepolymer whose end group is isocyanate (-NCO), which is designated as component A.

[0039] 2. Preparation of B component - NCO-terminated polyurethane prepolymer B component

[0040] Vacuum dehydrate 8g of hydroxyl-terminated polybutadiene at 110°C until the water content in the system is below 0.02wt%; cool down to room temperature, and slowly mix with component A for 10 minutes; raise the temperature to 75°C, and keep it w...

Embodiment 2

[0046] 1. Preparation of component A

[0047] Add 22g of polyethylene carbonate diol (molecular weight: 1500) and 8g castor oil polyester polyol (molecular weight: 500, functionality: 2.7) into the reaction kettle, stir evenly, heat up to 110°C and vacuum dehydrate to the system The water content is below 0.02wt%; cool down to room temperature, add 58g of MDI-50 (the mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate) into the reaction kettle, at 68 ℃ heat preservation reaction for 1.5h, and the polyurethane semi-prepolymer whose end group is isocyanate (-NCO group) is obtained, which is recorded as component A.

[0048] 2. Preparation of component B

[0049] Vacuum dehydrate 6g of hydroxyl-terminated polybutadiene and 4g of bisphenol A diglycidyl ether at 110°C until the water content in the system is below 0.02wt%; cool down to room temperature, and slowly mix with component A for 15min; heat up to 78 ℃, heat preservation reaction for 1.2h, a...

Embodiment 3

[0055] 1. Preparation of component A

[0056] Add 25g of polyεcaprolactone diol (molecular weight: 1500) and 20g castor oil polyester polyol (molecular weight: 400, functionality: 2.7) into the reaction kettle, stir evenly, heat up to 110°C and vacuum dehydrate to the system The water content is below 0.02wt%; cool down to room temperature, add 54g of MDI-50 (a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate) into the reaction kettle, Insulate and react at 70°C for 1.5h to prepare a polyurethane semi-prepolymer whose terminal group is isocyanate (NCO group), which is denoted as component A.

[0057] 2. Preparation of component B

[0058] Vacuum dehydrate 4g of bisphenol A diglycidyl ether and 6g of hydroxyl-terminated polybutadiene at 110°C until the water content in the system is below 0.02wt%; cool down to room temperature, and slowly mix with component A for 15 minutes; heat up to 80°C , keep warm for 1.5h to prepare a polyurethane prepol...

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Abstract

The invention discloses a polyurethane elastomer for coating equipment and a preparation method thereof. A mixture of mixed polyester polyol and diisocyanate reacts in a reaction kettle, a polyurethane quasi-prepolymer with isocyanato-NCO end capping is prepared, the polyurethane quasi-prepolymer reacts with hydroxyl containing resin, a polyurethane prepolymer with and end groups being in -NCO end capping is obtained; a chain extender and an organic bismuth catalyst are added; through vacuum defoamation and depressurization, materials are poured into a die, and through vulcanization and a step type aftertreatment process and through demolding, the polyurethane elastomer is obtained. The hardness of the elastomer is not lower than shore A 90; when the elastomer is soaked for 24 h in methyl ethyl ketone, the weight rate of the elastomer is not higher than 14%, and the industrial requirements of the coating equipment are completely met. The preparation method is low in cost, simple in process, green and environmentally friendly in the synthetic process and has good processing performance.

Description

technical field [0001] The invention relates to a polyurethane elastomer and a preparation method thereof, in particular to a polyurethane elastomer product applicable to coating equipment and other industries, and belongs to the technical field of polymer materials. Background technique [0002] In the coating equipment industry, stainless steel and polyvinyl chloride are mainly used for pipes and plates. After long-term contact with solvent-containing paint and powder paint, paint will accumulate at the transfer interface, resulting in pipe blockage and bursting. Seriously affect the service life of the equipment and bring great hidden dangers to production safety. Therefore, it is necessary to use a new material with high hardness and solvent resistance to protect the pipe transfer interface of the coating equipment and keep the pipeline unblocked. In addition, the requirements of environmental protection and market competitiveness put forward high requirements for the en...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/69C08G18/66C08G18/42C08G18/44C08G18/32C08G18/12C09D175/06C09D175/14
CPCC08G18/12C08G18/4202C08G18/4238C08G18/4277C08G18/4288C08G18/44C08G18/6588C08G18/698C08G18/7671C09D175/06C09D175/14C08G18/3206C08G18/3212C08G18/329C08G18/3814
Inventor 顾嫒娟张伟梁国正袁莉
Owner SUZHOU UNIV
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