Shape memory fiber prepared with shape memory polyurethane and its prepn process
A technology of memory fiber and polyurethane, which is applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, chemical post-treatment of rayon, etc., to achieve the effect of simple equipment, comfortable hand feeling and short process route
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Embodiment 1
[0024] Add 800g of polycaprolactone diol (PLACCEL240, Dacie1 Chemical Industries, LTD.) (molecular weight 4000, dried), 1000ml of dimethylformamide (solvent) and 240g of diphenylmethane diisocyanate in 3000ml, with Mechanically stirred and connected to a four-necked glass flask with a nitrogen port. Blow in dry nitrogen, mechanically stir, and keep the temperature at 80℃~90℃ to react for 4 hours. Then, 13.5 g of dimethylolpropionic acid and 45 g of 1,4-butanediol were 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 can be added during this reaction. Then 34.5 g of benzyl alcohol was added, and the reaction was continued for one hour, then the temperature of the reactant was lowered to 50° C., 11 g of triethylamine was added to neutralize the carboxyl group in the reactant, and the reaction was continued for one hour.
[0025] The shape memory polyurethane obtained by ...
Embodiment 2
[0027] Add 120g of polycaprolactone diol (PLACCEL240, Daciel Chemical Industries, LTD.) (molecular weight 4000, dried), 12g of polyethanol (molecular weight 200, dried), 300ml of dimethylformamide and 38g of toluene diisocyanate In a 500 ml, four-necked glass flask with mechanical stirring and connected to a nitrogen port. Blow in dry nitrogen, mechanically stir, and keep at 80℃~90℃ to react 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 can be added during this reaction. Then 6.3 g of butanone oxime was added, and the reaction was continued 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 remove ...
Embodiment 3
[0030] Add 300g of polycaprolactone diol (PLACCEL240, Daciel Chemical Industries, LTD.) (molecular weight 3000, dried), 40g of polypropanol (molecular weight of 200, dried), 27g of 1,4-butanediol and 300g of diisocyanide Isophorone acid was placed in a 1,000 ml reactor with mechanical stirring and connected to a nitrogen port. After reacting at 130°C for 1 hour, 100 g of benzyl alcohol-terminated unreacted isocyanate is added, and the reaction is continued at 130°C for half an hour to obtain a 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 in the first zone, 175-185°C in the second zone, 180-195°C in the third zone, and 180-195°C in the spinneret assembly. The diameter of the spinneret hole was 0.3 mm, the winding speed was 300 M / min, and the winding yarn was stretched 1.6 times at 48° C., and subjected to tension treatment at this temperature for 1 hour, thereby obtaining a shape m...
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Abstract
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