Polyurethane resin as well as preparation method and application thereof

Abstract

The invention relates to a polyurethane resin comprising the following components by the total mass proportion of a reaction system: 4%-6% of diphenylmethane-4,4'-diisocyanate, 20%-25% of long-chain polyatomic alcohol compounds, 0.4%-1.5% of diol chain extenders, 0.1%-0.5% of surfactants and 65%-75% of N,N-dimethylformamide (DMF) solvents. The long-chain polyatomic alcohol compounds comprise long-chain polyester polyatomic alcohol and polypropylene oxide-castor oil polyatomic alcohol, wherein the mass ratio of the polypropylene oxide-castor oil polyatomic alcohol to the long-chain polyatomic alcohol compounds is preferably 5%-15%. Because of macromolecular branched chains generated by the reaction of the polypropylene oxide-castor oil polyatomic alcohol introduced to polyurethane resin molecules with the polyurethane resin molecules, the crystallinity of the system is reduced, and the elongation of the resin is improved; because the hydrophilic performance of the resin is taken into account on the selection of raw materials, the resin with high elongation and low crystallinity still has the characteristic of better membrane formation, thereby the purpose that the tearing strength is improved after non-woven fabrics are dipped in the resin is realized. The invention also discloses a preparation method and application of the polyurethane resin.

Description

technical field [0001] The invention relates to a polyurethane resin and its preparation method and application, in particular to a polyurethane resin specially used for impregnating non-woven fabrics for the purpose of improving the tear strength after impregnating the non-woven fabrics, and belongs to the technical field of chemical industry. Background technique [0002] Traditional sports and leisure shoes all adopt genuine leather or cloth as material. Although natural leather has obvious advantages in appearance and air permeability, it has great limitations in certain properties, such as low strength, easy to mold, easy to be brittle, easy to deform, etc., and is also affected by factors such as ecological balance and environmental protection. , the application of natural leather is increasingly restricted; in addition, polyurethane (PU) synthetic leather made of raised woven or knitted fabric and ordinary polyester or polyester nylon non-woven fabric has better appea...

AI Technical Summary

Problems solved by technology

However, resins with high elongation have low crystallinity, DMF is not easy to wash out, and the resin has poor film-forming properties during the tanning process, so it is difficult to apply them in production.

Therefore, the development of polyurethane resins with high elongation, low crystallinity and easy washing out has become a technical problem in the industry.

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