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A kind of preparation method of shape memory polyurethane

A technology of polyurethane and polyurethane prepolymer, which is applied in the field of preparation of shape memory polyurethane, can solve the problems of poor memory effect, low shape fixation rate and shape recovery rate, and cannot be widely used, and achieves stable structure and good shape memory. Effects, easily adjustable effects

Active Publication Date: 2019-09-17
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a preparation method of shape memory polyurethane, aiming to solve the problem that the thermally induced shape memory polyurethane in the prior art has low shape fixation rate and shape recovery rate, poor memory effect and cannot be widely used

Method used

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  • A kind of preparation method of shape memory polyurethane
  • A kind of preparation method of shape memory polyurethane
  • A kind of preparation method of shape memory polyurethane

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preparation example Construction

[0018] The present invention provides a kind of preparation method of shape-memory polyurethane, and this method mainly comprises the following steps:

[0019] React 1,3,5,7-tetrahydroxyadamantane, ε-caprolactone, catalyst and solvent under the conditions of inert gas and 70-130°C for 20-50 hours to obtain adamantyl star-shaped polyε- Caprolactone, the molar ratio of the 1,3,5,7-tetrahydroxyadamantane and the ε-caprolactone is 1:40~240;

[0020] Mix the adamantyl star-shaped polyε-caprolactone with long-chain diol and diisocyanate evenly, add the catalyst and the solvent, and react at 50-100°C for 3-9 hours to obtain isocyanate-terminated polyurethane Prepolymer, the mass ratio of the adamantyl star polyε-caprolactone to the long-chain diol is 9:1~1:9;

[0021] A linking agent is added to the polyurethane prepolymer, so that the linking agent reacts with the isocyanate in the polyurethane prepolymer to obtain the adamantyl crosslinked shape memory polyurethane.

[0022] In t...

Embodiment 1

[0030] Under the protection of an inert gas, add 1,3,5,7-tetrahydroxyadamantane, ε-caprolactone, a catalyst and a solvent into the reaction flask, the catalyst is stannous isooctanoate, the solvent is toluene, through freezing and pumping 1. After removing oxygen and water by three cycles of ventilation, the reaction bottle was placed in an oil bath and heated to 90°C. After reacting for 24 hours, the solvent was removed by rotary evaporation to obtain adamantyl star polycaprolactone. Wherein, the molar ratio of 1,3,5,7-tetrahydroxyadamantane to ε-caprolactone is 1:60, stannous isooctanoate is 0.1wt%, and the solvent is 70wt%.

[0031] The adamantyl star poly-caprolactone obtained is added to 1,6-hexamethylene diisocyanate, poly-ε-caprolactone diol (molecular weight 5000), catalyst stannous octanoate, reaction solvent N, In the mixed system of N-dimethylformamide, stir evenly, and react at 80° C. to obtain a prepolymer. Then add small 1,4-butanediol to connect the prepolymer,...

Embodiment 2

[0033] Under the protection of an inert gas, add 1,3,5,7-tetrahydroxyadamantane, ε-caprolactone, a catalyst and a solvent into the reaction flask, the catalyst is stannous isooctanoate, the solvent is toluene, through freezing and pumping 1. After removing oxygen and water by three cycles of ventilation, the reaction bottle was placed in an oil bath and heated to 90°C. After reacting for 24 hours, the solvent was removed by rotary evaporation to obtain adamantyl star polycaprolactone. Wherein, the molar ratio of 1,3,5,7-tetrahydroxyadamantane:ε-caprolactone is 1:100, stannous isooctanoate is 0.1wt%, and the solvent is 70wt%;

[0034] The adamantyl star poly-caprolactone obtained is added to 1,6-hexamethylene diisocyanate, poly-ε-caprolactone diol (molecular weight 5000), catalyst stannous octanoate, reaction solvent N, In the mixed system of N-dimethylformamide, stir evenly, and react at 80° C. to obtain a prepolymer. Then add small 1,4-butanediol to connect the prepolymer, a...

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Abstract

The invention provides a preparation method of shape memory polyurethane, and relates to the technical field of preparation of polyurethane materials. The method comprises the following steps: carrying out a reaction on 1,3,5,7-tetrahydroxyadamantane, epsilon-caprolactone, a catalyst and a solvent in an inert gas at 70-130 DEG C for 20-50 h to obtain adamantyl star-shaped poly(epsilon-caprolactone), wherein a molar ratio of the 1,3,5,7-tetrahydroxyadamantane to the epsilon-caprolactone is 1:(40-240); uniformly mixing the adamantyl star-shaped poly(epsilon-caprolactone) with long-chain diol and isocyanate, adding a catalyst and the solvent, and carrying out a reaction at 50-100 DEG C for 3-9 h to obtain an isocyanate-terminated polyurethane prepolymer, wherein a mass ratio of the adamantyl star-shaped poly(epsilon-caprolactone) to the long-chain diol is 9:1 to 1:9; and adding a linking agent to the polyurethane prepolymer to react the linking agent with the isocyanate in the polyurethane prepolymer in order to obtain the adamantane crosslinked shape memory polyurethane. The shape memory polyurethane prepared through the method has the advantages of very good shape memory effect and range enlargement.

Description

technical field [0001] The invention belongs to the technical field of polyurethane material preparation, and in particular relates to a preparation method of shape-memory polyurethane. Background technique [0002] Shape memory polymer is a smart polymer material that can fix a temporary shape and return to its original shape under the action of external stimuli (such as: heat, light, magnetism or chemical). Among them, perfecting the structural design of SMPs and improving the functional properties of SMPs are the current development direction of SMPs, and they are also the hotspots of the current research on smart polymer materials. [0003] Thermally induced shape memory polyurethane refers to the shape memory that can deform at a certain temperature and can maintain the deformed deformation at room temperature or low temperature. When the temperature rises to a specific response temperature, it can return to the shape memory of the original shape. polymer material. Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/12C08G18/73C08G63/08C08G63/85C08G63/78
Inventor 陈少军傅淑琴
Owner SHENZHEN UNIV
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