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Preparation method of bio-based self-repairing polyurethane elastomer

A technology of polyurethane elastomer and polyurethane prepolymer is applied in the field of preparation of bio-based self-healing polyurethane elastomer, which can solve the problems of inability to further use, damage of polyurethane, non-renewable, etc., and achieve good self-healing performance and mild preparation process conditions. , the effect of low price

Pending Publication Date: 2021-06-18
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Technical problem to be solved: The purpose of the present invention is to solve the problem that most of the traditional polyurethane raw materials come from petroleum-based energy which is non-renewable, and the synthetic polyurethane cannot be further utilized in case of damage, resulting in waste of resources, and provides a bio-based self-repairing Preparation method of polyurethane elastomer

Method used

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[0027] A preparation method of bio-based self-healing polyurethane elastomer, furfurylamine and formaldehyde undergo condensation reaction in the presence of hydrochloric acid, and then undergo aldolamine condensation with vanillin to obtain a small molecule chain extender containing dynamic imine bonds, and then Chain extension reaction with polyurethane prepolymer made of diphenylmethane diisocyanate (MDI-50) and polypropylene glycol (PPG), after vacuum degassing, pour the obtained solution into a preheated polytetrafluoroethylene mold , heating at 40-80°C for 12-30 hours to obtain a polyurethane elastomer.

[0028] Described chain extender synthetic steps are as follows:

[0029] (1) Preparation of Difurfurylamine: Add furfurylamine into a flask with a reflux condenser, cool to -5-5°C, add hydrochloric acid with a mass fraction of 10-40%, heat up to 10-30°C and stir. Add a part of acetone, raise the temperature to 10-50°C, and then add the remaining acetone to continue the...

Embodiment 1

[0034] Described chain extender synthetic steps are as follows:

[0035] (1) Preparation of bisfurfurylamine: add 0.2mol of furfurylamine into a flask with a reflux condenser, cool to -5°C, add 10% hydrochloric acid (0.6mol), heat up to 10°C and stir. 0.13 mol of acetone was added, the temperature was raised to 10° C., and the remaining 0.07 mol of acetone was added to continue the reaction for 2 days. After the mixture was cooled, 50ml of water was added, and the pH was adjusted to 8 with a 10wt% sodium hydroxide solution. After extraction with tetrahydrofuran, the organic phase was washed with saline, dried and rotary evaporated to obtain the product DFA.

[0036] (2) Preparation of chain extender: After dissolving 0.2 mol of vanillin, add a solution of bisfurfurylamine (0.1 mol) in dichloromethane dropwise, heat to 30°C for 20 min, spin evaporate, and vacuum dry to obtain chain extender VDFA.

[0037] Add 0.072 mol of diphenylmethane diisocyanate (MDI) to 0.04 mol of polyp...

Embodiment 2

[0039] (1) Preparation of bisfurfurylamine: add 0.2mol of furfurylamine into a flask with a reflux condenser, cool to 5°C, add 10% hydrochloric acid (0.6mol), heat up to 10°C and stir. 0.13 mol of acetone was added, the temperature was raised to 50° C., and the remaining 0.07 mol of acetone was added to continue the reaction for 5 days. After the mixture was cooled, 50 ml of water was added, and the pH was adjusted to 8 using a sodium hydroxide solution with a mass fraction of 10 wt%, and the organic phase was extracted with dichloromethane, washed with saline, dried and rotary evaporated to obtain the product DFA;

[0040] (2) Preparation of chain extender: After 0.2 mol of vanillin was dissolved, a DMF solution of bisfurfurylamine (0.1 mol) was added dropwise, heated to 70°C for 70 min, rotary evaporated, and vacuum dried to obtain chain extender VDFA.

[0041] Add 0.072mol of diphenylmethane diisocyanate (MDI) to 0.04mol of polypropylene glycol with a molecular weight of 10...

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Abstract

The invention provides a preparation method of a bio-based self-repairing polyurethane elastomer. The method comprises the following steps: taking furfuryl amine and vanillin as main raw materials to obtain a micromolecular chain extender, carrying out chain extension reaction on the micromolecular chain extender and a polyurethane prepolymer prepared from diphenylmethane diisocyanate and polypropylene glycol, carrying out vacuum defoaming, pouring into a polytetrafluoroethylene mold, and curing to finally obtain the bio-based polyurethane elastomer with the self-repairing function. According to the invention, the chain extender with the imine dynamic covalent bond are environmentally friendly in raw materials, and wide in raw material source, and is introduced into a polyurethane structure through molecular design to endow an elastomer with excellent self-repairing performance and mechanical performance, wherein the self-repairing efficiency at 60 DEG C can reach 87%, and the elongation at break is 220%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a bio-based self-repairing polyurethane elastomer. Background technique [0002] Invented in 1930, polyurethane is widely used in all aspects of life, such as decoration, automobiles, clothes, shoes, elastomers, coatings, walls, roof partitions, bridges and pipeline transportation, etc. It plays a very important role in modern social life role. In 2016, my country's annual output of polyurethane reached 14 million tons, ranking sixth among all polymers. The main raw materials for preparing polyurethane are isocyanate, polyol and chain extender. Compared with non-renewable petroleum-based raw materials, biomass, as a renewable resource, occupies an important position in maintaining the ecological balance of the earth and ensuring the sustainable development of human society. Especially in recent decades, with the rapid development o...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/10C08G18/38
CPCC08G18/7671C08G18/6685C08G18/4825C08G18/10
Inventor 张猛潘政周永红赵琦胡立红薄采颖
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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