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Shape memory fiber prepared with shape memory polyurethane and its prepn process

A memory fiber, polyurethane technology, applied in the direction of fiber chemical characteristics, one-component synthetic polymer rayon, textiles and papermaking, etc., to achieve the effect of comfortable hand feel, good practical performance and high spinning speed

Inactive Publication Date: 2005-12-14
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is only one patent mentioning shape memory fiber (US Patent No.5128197). The shape-memory fiber in the paper uses the glass state temperature of the fiber as the shape-memory transition temperature, usually its shape-memory transition temperature is lower than 40°C, and there is no reference to the specific preparation method of the shape-memory fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add the polycaprolactone diol (PLACCEL240 of 800g, Daciel ChemicalIndustries, LTD.) (molecular weight 4000, dried), the diphenylmethane diisocyanate of 1000 milliliters (solvent) and 240g in 3000 milliliters, belt Mechanically stirred and connected to a four-neck glass flask with a nitrogen port. Dry nitrogen gas was introduced, mechanically stirred, and the reaction was maintained at a temperature of 80°C to 90°C for 4 hours. Then, 13.5 g of dimethylol propionic acid and 45 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 80° C. to 90° C. A small amount of dimethylformamide may be added during this reaction. Then add 34.5g benzyl alcohol, continue to react for one hour, then reduce the temperature of the reactant to 50°C, add 11g of triethylamine to neutralize the carboxyl groups in the reactant, continue to react for one hour.

[0025] The shape-memory polyurethane obtained...

Embodiment 2

[0027] Add 120g of polycaprolactone diol (PLACCEL240, Daciel ChemicalIndustries, LTD.) (molecular weight 4000, dried), 12g polyglycol (molecular weight 200, dried), 300 milliliters of dimethylformamide and 38g of toluene diisocyanate In a 500 ml four-neck glass flask with mechanical stirring and a nitrogen port. Dry nitrogen gas was introduced, mechanically stirred, and the temperature was maintained at 80°C to 90°C for 5 hours. Then, 8.1 g of 1,4-butanediol was added as a chain extender, and the reaction was continued for 2 hours while maintaining the temperature between 80°C and 90°C. A small amount of dimethylformamide may be added during this reaction. Then add 6.3g butanone oxime, continue to react for one hour. The shape-memory polyurethane obtained by polymerization in Example 2 was pelletized after removing the solvent to obtain polyurethane pellets.

[0028] The pellets were dried in a vacuum oven for 22 hours (drying temperature 48° C., vacuum degree 0.05 MPa) to re...

Embodiment 3

[0030] Add 300g of polycaprolactone diol (PLACCEL240, Daciel ChemicalIndustries, LTD.) (molecular weight 3000, dried), 40g polypropylene alcohol (molecular weight 200, dried), 27g 1,4-butylene glycol and 300g of diisocyanate Acid isophorone in a 1000 ml reaction kettle with mechanical stirring and a nitrogen port. React at 130° C. for 1 hour, then add 100 g of benzyl alcohol to block unreacted isocyanate, and continue to react at 130° C. for half an hour to obtain melt-polymerized blocked shape-memory polyurethane, which is then spun by screw extrusion. The temperature of each zone of the screw is: 175-180°C for the first zone, 175-185°C for the second zone, 180-195°C for the third zone, and 180-195°C for the spinneret assembly. The spinneret hole diameter is 0.3mm, the winding speed is 300M / min, the winding filament is stretched 1.6 times at 48°C, and subjected to tension treatment at this temperature for 1 hour, thereby obtaining the shape memory fiber. The shape fiber fine...

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Abstract

The present invention relates to one kind of shape memory fiber prepared with shape memory polyurethane and its preparation process. The shape memory polyurethane is prepared with material including one hydroxyl containing polymer, chain expander, diisocyanate and blocking agent in the molar ratio of 1 to 1-3 to 2.4-4.8 to 0.8-1.6. The preparation process of the shape memory fiber includes the following steps: preparing shape memory polyurethane with excessive isocyanate; adding blocking agent to obtain blocked shape memory polyurethane; and melt spinning to obtain shape memory fiber. The shape memory fiber of the present invention has very wide temperature regulating range, practical elasticity, strength and shape memory performance and comfortable hand feeling, is easy to spin alone or together with synthetic fiber and natural fiber, and may find wide application in clothing, biomedical material and other fields.

Description

technical field [0001] The invention relates to a shape-memory fiber prepared from shape-memory polyurethane and a preparation method thereof. The shape-memory fiber has excellent shape-memory properties, that is, the fiber can change shape at a temperature higher than the shape-memory transition temperature, and when the fiber is cooled When it is set below the shape memory transition temperature, the fiber can return to its original shape when heated above the shape memory transition temperature. Background technique [0002] Shape memory polymer refers to a polymer material that has an initial shape, and after being deformed and fixed, the external conditions can be changed by heating or other methods to restore the original shape. Shape memory is exploited by heating the altered shape above the shape memory transition temperature to restore the original state. That is to say, the shape memory polymer is fixed in a certain model and deformed in a certain temperature chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94
Inventor 胡金莲杨国荣杨卓鸿叶光斗黄元华
Owner THE HONG KONG POLYTECHNIC UNIV
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