Low temperature high elastic type waterproof antifouling water-based polyurethane finishing agent preparing method and product

Abstract

The invention relates to a low temperature high elastic type waterproof antifouling water-based polyurethane finishing agent preparing method and product. The method comprises the steps of preparing raw materials, and dewatering polyether triol and polyether diol; enabling the polyether triol and the polyether diol to be in performed reaction with end hydroxyl polysiloxane linear bodies and diisocyanate under catalysis of polymerization catalyst so as to obtain performed polymers; conducting chain extension on the performed polymers and chain extenders with the existence of diluents to obtain intermediates; conducting end capping on the intermediates and fluorine alkyl alcohol, and then adding reaction termination agents to end reaction; adding neutralizing agents, diluents, and water and emulsifying so as to obtain the low temperature high elastic type waterproof antifouling water-based polyurethane finishing agent emulsion product which is a main chain end hydroxyl polysiloxane modified ionic water-based polyurethane polymer material containing perfluorinated alkyl end groups, is used for processing of various textile coating and artificial leather dry coating, and can endow products with good waterproof antifouling performance, low-temperature high elastic characteristic and bending resistant performance.

Description

technical field [0001] The invention relates to a functional polyurethane finishing agent emulsion used for the coating of various textiles and the dry finishing process of artificial leather, in particular to a preparation method of a low-temperature high-elastic water-repellent and sewage-proof polyurethane finishing agent and its product. Background technique [0002] At present, polyurethane polymer materials are often used in the coating of various textiles and the dry finishing process of artificial leather. In order to solve the problems of traditional single-functional solvent-based polyurethane coating agents such as high pollution, low-temperature fatigue and poor functionality, the low-temperature soft, high-elastic and functional water-based paint modified by various functional monomers and block organosilane chains Polyurethane finishes are becoming mainstream products in the field of finishing. Functional waterborne polyurethane coating agents are generally pr...

AI Technical Summary

Problems solved by technology

However, this preparation method uses trimethylolpropane as a chain extender to introduce crosslinks into polyurethane polymers, which will inevitably lead to difficult control of the reaction process due to the rapid increase and high viscosity of the system.

In addition, the hydroxyl polysiloxane used in the formulation is also difficult to react with the isocyanate group to form an effective chemical bond with the polyurethane polymer, so the polysiloxane polymer will be more enriched in the material during the thermosetting process. The surface of the film, resulting in poor water resistance of the film

At the same time, the cross-links in polyurethane polymers are short, which is not conducive to the enrichment of fluorine-containing water-repellent chains on the surface of the film.

These have led to the water resistance of the material, especially the alkali resistance is not ideal