Preparation method and product of modified polyurethane flexible high-molecular emulsion containing side long chain alkyl

Abstract

The invention relates to a preparation method and product of a modified polyurethane flexible high-molecular emulsion containing side long chain alkyl. The preparation method comprises the following steps: preparing raw materials including a polymeric monomer, a modifying agent, an auxiliary agent and water; performing dehydration pretreatment on polyether triol and polyether glycol; performing prepolymerization; performing chain extension; sealing ends; and emulsifying to prepare a modified polyurethane flexible high-molecular emulsion product containing side long chain alkyl. According to the modified polyurethane flexible high-molecular emulsion disclosed by the invention, polysiloxane chain links and polyolefin chain links are embedded into a skeleton structure of the modified polyurethane flexible high-molecular emulsion, and polyurethane high molecules are modified by using long chain alkyl. The obtained modified polyurethane flexible high-molecular emulsion containing side long chain alkyl has a certain density of long chain crosslinking and side long chain alkyl, has excellent stability, can be applied to dry coating processing of various substrate coatings and artificial leathers, and ensures that significant water-repellent and anti-fouling abilities, extremely excellent extension performance, excellent low-temperature high flexibility and anti-bending performance of product coating films can be achieved; and the product is safe and environment-friendly, and is convenient to use.

Description

Technical field [0001] The invention relates to a functional polyurethane coating agent emulsion suitable for various substrate coatings and dry coating processing of artificial leather, in particular to the preparation of a modified polyurethane flexible polymer emulsion containing side long-chain alkyl groups. Background technique [0002] At present, polyurethane polymer materials are often used in the coating of substrates and the dry finishing of artificial leather. In order to solve the problems of traditional polyurethane coating agents that are hard at low temperature, easy to fatigue, low extensibility and poor functionality, waterborne polyurethane coating agents modified with various functional monomers are becoming mainstream products in the field of coating processing. Functional water-based polyurethane finishing agents generally introduce various functional polymerized monomers, reactive functional molecules or functional groups into the polyurethane skeleton, ends...

AI Technical Summary

Problems solved by technology

However, this preparation method uses a small-molecule trifunctional chain extender to introduce cross-links into the polyurethane polymer, which makes it difficult to control the reaction process due to the rapid increase in system viscosity and high viscosity. The polyurethane polymer brought by the trifunctional chain extender The short-chain cross-linking is also not conducive to the enrichment of fluorine-containing water-repellent chain segments to the surface of the film

In addition, the hydroxyl polysiloxane used in the formulation is difficult to react with isocyanate groups to form effective chemical bonds with polyurethane polymers, resulting in severe polyurethane microphase separation and poor water resistance

At the same time, the fluorine-containing polyether polyol has a large molecular weight and high price, which limits the fluorine access of polyurethane

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