A water-soluble, spinnable polyurethane elastomer based on RIM technology

Abstract

The invention provides a water-soluble and spinnable polyurethane elastomer prepared based on the RIM technology. A linear polymer is prepared from potential hydrophilic group-containing dibasic alcohol components and diisocyanate components through the RIM technology. Because the elastomer contains a potential hydrophilic group, water-soluble and water-insoluble mutual conversion can be realized on the premise that main chains of molecules are not damaged; before being released, the hydrophilic group is a non-hydrophilic elastomer which can be used for spinning of island fiber sea components; after being released, the hydrophilic group is a water-soluble high molecular compound which can be subjected to reduced fibrillation under mild conditions; and after being sealed, the hydrophilic group is water-insoluble, so that recovery can be realized under mild conditions. Organic solvents or waste water containing organic matters are not generated in the processes, thereby being favorable for environmental protection.

Description

technical field [0001] The invention relates to the field of thermoplastic polyurethane elastomers, in particular to a water-soluble, spinnable polyurethane elastomer prepared based on RIM technology. Background technique [0002] The sea-island fiber is a special-shaped fiber made by blending or composite spinning two incompatible polymers. The island component polymer is dispersed in another sea component polymer in the form of maintaining fibers. When the sea After the components are removed, microfibers with island component strokes are obtained; microfibers have the characteristics of fine fineness, soft touch, large specific surface area and capillary effect, and good moisture absorption and dissipation properties. [0003] Microfiber plays an important role in the national economy. In 2014 alone, the output of domestic microfiber synthetic leather was nearly 100 million meters. Domestic superfine fiber synthetic leather is mainly prepared from sea-island fibers, and ...

AI Technical Summary

Problems solved by technology

Domestic superfine fiber synthetic leather is mainly prepared from sea-island fibers, and is carried out by benzene reduction or alkali reduction: benzene reduction is to use toluene as a solvent to dissolve and remove the sea component in the fiber—polyethylene, although benzene reduction is in the It is carried out in a relatively closed environment, but a large amount of toluene (85-150g / 1kg fiber) will still volatilize in the process of weight reduction and polyethylene recovery, causing serious pollution and waste of resources; alkali weight reduction is done in 10% sodium hydroxide lye Hydrolyze and remove the sea component-polyester, and hydrolyze the polyester into terephthalate and ethylene glycol. At the same time, a large amount of waste water containing phthalate and ethylene glycol is produced, which is not easy to recycle and use with high added value. It also causes high COD content in wastewater, which is not easy to degrade, and direct discharge also causes serious environmental pollution and waste of resources