Polyurethane with shape memory property, composition containing it and shape memory fabric prepared therefrom

A polyurethane and fabric technology, applied in non-woven fabrics, textiles, papermaking, fiber treatment, etc., to achieve the effect of soft hand feeling, improved mechanical properties, and enhanced shape memory function

Active Publication Date: 2005-08-03
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, so far, there are no discussions, reports and patents on the preparation of waterborne shape memory polyurethane by introducing carboxyl groups at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The present invention also provides the preparation method of above-mentioned polyurethane, comprises the steps:

[0041] a) mixing the hydroxyl-containing oligomer with an excess of diisocyanate and heating the resulting mixture;

[0042] b) adding a chain extender containing an active hydrogen group and a carboxyl-containing chain extender during the reaction;

[0043] c) adding an end-capping agent;

[0044] d) adding an alkaline neutralizer and a cross-linking agent so that the pH value of the reaction solution is between 6-7; and

[0045] e) dispersing the prepolymer obtained in step d) in water to continue the reaction.

[0046] The present invention provides a method for preparing a shape memory fabric, comprising finishing the base fabric with a finishing agent comprising the above-mentioned polyurethane.

[0047] In one embodiment of the present invention, the finishing method comprises the steps of: a) padding the base fabric with a finishing agent; b) drying...

Embodiment 1

[0085] Add 120g of polycaprolactone (PLACCEL240, Daciel ChemicalIndustries, LTD.) (molecular weight 4000, dried), and 30g of diphenylmethane diisocyanate in a 500ml, four-necked glass flask with mechanical stirring, connected to the nitrogen port middle. Pass dry nitrogen gas, stir mechanically, and keep the temperature at 80°C to 90°C for 3 hours. Then, 2.7 g of dimethylol propionic acid and 4.5 g of 1,4-butanediol were sequentially added as a chain extender, and the reaction was continued for 2 hours under the condition of maintaining the temperature between 80°C and 90°C. A small amount of dimethylformamide may be added during this reaction. Then lower the temperature of the reactant to 50° C., and add 2.2 g of triethylamine to neutralize the carboxyl groups in the reactant. Finally, 250 milliliters of deionized water containing 4.2 g of sodium bisulfite was added under high-speed stirring (1000 rpm) of the stirrer to obtain a colorless and transparent water-based shape-m...

Embodiment 2

[0087] Add 48 g of polypropylene glycol (molecular weight 2000, dried), and 20 g of diphenylmethane diisocyanate into a 500 ml four-neck glass flask with mechanical stirring and a nitrogen port. Pass dry nitrogen, under the effect of agitator, keep temperature 80 ℃~90 ℃ and react for 3 hours. Then add 3.2g of dimethylolpropionic acid and 1.5g of 1,4-butanediol as a chain extender in order to continue the reaction for 2 hours under the condition of maintaining the temperature between 80°C and 90°C, and then add 2.8g of butanone The oxime was left to react for 2 hours. A small amount of dimethylformamide may be added during this reaction. Then reduce the temperature of the reactant to 50° C., and add 2.6 g of diethanolamine to neutralize the carboxyl groups in the reactant. Finally, 100 milliliters of deionized water was added under high-speed stirring (1000 rpm) of the stirrer to obtain water-based shape-memory polyurethane with a solid content of 40% (by weight). In this em...

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Abstract

The said polyurethane is prepared through preparing polymer with diisocyanate, hydroxyl-containing oligomer, chain expander with active hydrogen radical and chain expander with carboxylic radical, neutralizer with alkali radical, blocking agent, cross-linking agent and optional catalyst in certain proportion; and subsequent reaction in water to obtain polymer. The polyurethane features the blocking diisocyanate radical and hydroxyl radical and thus shape converting temperature of -30 deg.c to 100 deg.c. In temperature higher than the shape converting temperature, the polyurethane may have its shape converted; in temperature lower than the shape converting temperature, the polyurethane is unchanged in shape; and the polyurethane heated to the temperature higher than the shape converting temperature will restore original shape.

Description

technical field [0001] The invention relates to a polyurethane with shape memory and its application in preparing shape memory fabrics. More specifically, the present invention relates to polyurethane with shape memory, a water-based shape memory polyurethane composition and a preparation method thereof, a shape memory fabric and a preparation method thereof. Background technique [0002] Generally, a foam material made of polyurethane having shape memory has been widely used (Japanese Laid-Open Patent Publication Hei 2-113016, 1990, Mitsubishi Heavy Industries, Ltd.). Shape-memory polyurethane has large deformation recovery and thermal insulation properties, and these properties have been widely used in various commodities. These foams can be secondary molded under certain shape requirements and under certain molds. A shaped shape memory polymer changes shape above its shape memory transition temperature but below its rheological temperature, and when the polymer in the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08L75/04D04H3/08D06M15/564D06N7/06
Inventor 胡金莲杨卓鸿
Owner THE HONG KONG POLYTECHNIC UNIV
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