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Polyurethane elastomer taking bio-based amorphous multi-component polyester as soft segment and preparation method thereof

A polyurethane elastomer and multi-polyester technology, applied in the field of polymer materials, can solve the problems of low temperature resistance and poor flexibility, and achieve the effects of improving elongation at break, wide design window and improving performance

Active Publication Date: 2021-07-16
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the easy crystallization of the soft segment, it has poor low temperature resistance and flexibility

Method used

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  • Polyurethane elastomer taking bio-based amorphous multi-component polyester as soft segment and preparation method thereof
  • Polyurethane elastomer taking bio-based amorphous multi-component polyester as soft segment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of bio-based polypolyester soft segment: the molar ratio of bio-based 1,3-propanediol, 2,3-butanediol, succinic acid, and sebacic acid is 1.1 / 0.3 / 0.7 / 0.3 (alcohol-acid ratio 1.4:1) was added into a 250mL four-necked flask, heated to 170°C, and esterified for 3 hours; then the catalyst tetrabutyl titanate was added (the amount of the catalyst accounted for 0.03% of the total mass of dibasic alcohol and dibasic acid ), the temperature was adjusted to 220° C., and the vacuum reaction was carried out for 1 hour to obtain a hydroxyl-terminated amorphous polyester with a number average molecular weight of 4000.

[0046] The preparation method of polyurethane prepolymer: In a 100mL four-necked flask, stir the hydroxyl-terminated polyester at 80°C under vacuum for 2 hours, then cool down to 70°C, add a measured amount (polyester soft segment and diisocyanate The molar ratio is 1:2, the soft and hard segment mass ratio is 87 / 13) diphenylmethane diisocyanat...

Embodiment 2

[0050] The preparation method of bio-based polypolyester soft segment: bio-based ethylene glycol, 1,3-propanediol, succinic acid, adipic acid, and itaconic acid in molar ratios of 0.80 / 0.80 / 0.63 / 0.27 / 0.10 (alcohol Acid ratio 1.6:1) was added into a 250mL four-necked flask, heated to 180°C, and esterified for 2 hours; then the catalyst p-toluenesulfonic acid was added (the amount of catalyst accounted for 0.06% of the total mass of dibasic alcohol and dibasic acid) %), the temperature was adjusted to 200°C, and the vacuum reaction was carried out for 2.5 hours to obtain a hydroxyl-terminated amorphous polyester with a number average molecular weight of 5000.

[0051] The preparation method of polyurethane prepolymer: In a 100mL four-necked flask, stir the hydroxyl-terminated polyester at 90°C under vacuum for 3 hours, then cool down to 75°C, add a measured amount (polyester soft segment and diisocyanate The molar ratio is 1:5, the soft and hard segment mass ratio is 79 / 21) 1,5-...

Embodiment 3

[0055] Preparation method of bio-based multi-polyester soft segment: bio-based ethylene glycol, 1,4-butanediol, 1,10-decanediol, succinic acid, and sebacic acid in a molar ratio of 0.75 / 0.6 / 0.15 / 0.8 / 0.2 (alcohol-acid ratio 1.5:1) was added to a 250mL four-neck flask, heated to 190°C, and esterified for 2 hours; then the catalyst tetraisopropyl titanate was added (the amount of the catalyst accounted for 0.04% of the total mass of the dibasic acid), the temperature was adjusted to 210° C., and the vacuum reaction was carried out for 3 hours to obtain a hydroxyl-terminated amorphous polyester with a number average molecular weight of 6000.

[0056] The preparation method of polyurethane prepolymer: In a 100mL four-necked flask, the hydroxyl-terminated polyester was stirred at 95°C under vacuum for 2 hours, then cooled to 80°C, and a measured amount (polyester soft segment and diisocyanate The molar ratio is 1:4, the soft and hard segment mass ratio is 82 / 18) dicyclohexylmethane...

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Abstract

The invention discloses a polyurethane elastomer taking bio-based amorphous multi-component polyester as a soft segment and a preparation method thereof. The elastomer material is prepared by polymerizing the following substances: a soft segment and a hard segment, wherein the mass ratio of the soft segment to the hard segment is (70-90): (10-30); the soft segment is hydroxyl-terminated amorphous polyester obtained by reaction of at least four bio-based dihydric alcohols and binary acid; and the hard segment comprises isocyanate and a micromolecular polyol chain extender. The bio-based multi-component polyester is polyurethane elastic with a soft segment, retains the advantages of good mechanical properties, oil resistance, excellent wear resistance and the like of polyester polyurethane, overcomes the defects of poor low-temperature flexibility and poor elasticity, widens the application field, and can be used in the fields of tire treads, low-temperature oil-resistant sealing rings and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyurethane elastomer with a bio-based amorphous polypolyester as a soft segment and a preparation method thereof. Background technique [0002] Polyurethane elastomer is a polymer with microphase separation structure, including soft segment and hard segment. The soft segment provides elasticity, and the hard segment provides physical or chemical crosslinking points and mechanical strength. Therefore, polyurethane elastomer has high mechanical strength. , Excellent chemical solvent resistance, oil resistance, good resilience, etc., have been widely used in tires, rubber rollers, transmission belts, sealing products, coated products, shoemaking, medical and other fields. [0003] According to the type of soft segment, polyurethane elastomers are mainly divided into two categories: polyester polyurethane and polyether polyurethane. Among them, the polyester soft segme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/10C08G18/32C08G63/16C08G63/52
CPCC08G18/4238C08G18/10C08G63/16C08G63/52C08G18/3206
Inventor 王朝张奇男张立群秦璇王文才王嘉栋张宁赵燕超
Owner BEIJING UNIV OF CHEM TECH
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