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A kind of polyurethane elastomer with bio-based amorphous multi-polyester as soft segment and preparation method

A technology of polyurethane elastomer and multi-polyester, which is applied in the field of polymer materials, can solve the problems of low temperature resistance and poor flexibility, and achieve the effect of improving elongation at break, enriching varieties, and broadening application fields

Active Publication Date: 2022-05-24
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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  • A kind of polyurethane elastomer with bio-based amorphous multi-polyester as soft segment and preparation method
  • A kind of polyurethane elastomer with bio-based amorphous multi-polyester as soft segment and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0046]Preparation method of polyurethane prepolymer: in a four-mouth flask of 100mL, the hydroxyl-terminated polyester was stirred at 80 °C, vacuum for 2 hours, and then cooled down to 70 °C, and the metered (the molar ratio of the polyester soft segment and diisocyanate is 1:2, the mass ratio of the soft and hard segment is 87 / 13) diphenylmethane diisocyanate, the reaction is 3 hours, to obtain the pre...

Embodiment 2

[0050] Preparation method of bio-based poly polyester soft segment: the ratio of bio-based ethylene glycol, 1,3-propanediol, succinic acid, adipic acid, yikang acid massage ratio of 0.80 / 0.80 / 0.63 / 0.27 / 0.10 (alkoxide ratio 1.6:1) was added to a 250mL four-mouth flask, heated to 180 °C, esterified for 2 hours; then added catalyst paratobenzenesulfonic acid (the amount of catalyst accounted for 0.06% of the total mass of diol and dibasic acid), the temperature was adjusted to 200 °C, The vacuum reaction was carried out for 2.5 hours to obtain several amorphous polyesters with an average molecular weight of 5000 hydroxyl ends.

[0051] Preparation method of polyurethane prepolymer: In a four-mouth flask of 100mL, the hydroxyl-terminated polyester was stirred at 90 °C, vacuum for 3 hours, and then cooled down to 75 °C, and the metered (the molar ratio of the polyester soft segment and diisocyanate is 1:5, the mass ratio of the soft and hard segment is 79 / 21) 1,5-naphthalene diisocyana...

Embodiment 3

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

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

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Abstract

The invention discloses a polyurethane elastomer with a bio-based amorphous multi-polyester as a soft segment and a preparation method thereof. The elastomer material is obtained by polymerizing the following substances: soft segment and hard segment; the mass ratio of soft segment and hard segment is: (70-90): (10-30); the soft segment is composed of at least four A hydroxyl-terminated amorphous polyester obtained by reacting a bio-based dibasic alcohol and a dibasic acid; the hard segment includes isocyanate and a small molecule polyol chain extender. The bio-based multi-polyester of the present invention is the polyurethane elasticity of the soft segment, which retains the advantages of polyester-type polyurethane, such as good mechanical properties, oil resistance, and excellent wear resistance, and simultaneously solves the shortcomings of poor low temperature flexibility and poor elasticity, and broadens its application Fields, so that it can be used in tire treads, low-temperature oil-resistant sealing rings and other fields.

Description

Technical field [0001] The present invention relates to the field of polymer material technology, further, is involved in a kind of bio-based amorphous polyurethane polyurethane elastomer as a soft segment polyurethane elastomer and preparation method. Background [0002] Polyurethane elastomer is a kind of polymer with microphase separation structure, including soft segment and hard segment, soft segment provides elasticity, hard segment provides physical or chemical crosslinking point and mechanical strength, therefore, polyurethane elastomer has high mechanical strength, excellent chemical solvent resistance, oil resistance, good resilience, etc., has been widely used in tires, rubber rollers, transmission belts, sealing products, coating products, shoes, medical and other fields. [0003] Polyurethane elastomers are mainly divided into two categories: polyester polyurethane and polyether polyurethane according to the type of soft segment. Wherein the polyester soft segment is...

Claims

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Application Information

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Patent Type & Authority Patents(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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