Polyether type polyurethane shoe sole and its preparation method

Abstract

The present invention is polyether type modified polyurethane sole and its making process. The materials for the polyether type polyurethane sole include polyether polyol, chain expander, water, surfactant and catalyst to form one mixture system. The polyether type polyurethane sole is made through adding stuffing into the mixture system to form the stuffing modified component, reacting the stuffing modified component and the pre-polymer to prepare stuffing modified polyurethane material, and other steps. The present invention has reduced dependence of product performance on the polyether material, and modifying with stuffing possessing physical cross-linking effect can raise the mechanical performance of the polyether type polyurethane sole.

Description

1. Technical field: [0001] The invention relates to a polyurethane shoe sole and a preparation method thereof, in particular to a polyether polyurethane shoe sole and a preparation method thereof, belonging to the technical field of manufacturing methods of modified polyurethane shoe soles. 2. Technical background: [0002] Polyurethane microcellular elastomer has been more and more widely used in people's daily life due to its excellent wear resistance, tear resistance, impact resistance, excellent resilience and comfort. Polyurethane microporous elastomer, as a shoe sole material, was industrialized in Europe in the 1960s, entered the North American market in the 1970s, and developed rapidly in the world in the 1980s. At present, polyurethane materials account for 8.0% of the world's footwear industry. In Western Europe and North America, the proportion is as high as 22%. [0003] Polyurethane sole stock solution can be divided into two categories: polyester type and poly...

AI Technical Summary

Problems solved by technology

Many properties of polyester soles such as tensile strength, tear strength, elongation at break, wear resistance, and folding resistance are superior to those of polyether soles, so they account for more than 85% of the entire polyurethane sole material, but Its low temperature performance is poor, and it is prone to hydrolysis and biodegradation; while the polyether sole just overcomes the weakness of the polyester polyurethane sole, and has strong low temperature performance, hydrolysis resistance and mildew resistance. With the popularization of sports, polyether polyurethane soles with good hydrolytic stability have become the focus of attention, especially in harsh weather, such as heavy rainfall, cold areas and wet working environments, polyether soles have the properties of polyester irreplaceable role

However, due to its poor mechanical strength, except for the above special fields, polyether soles are difficult to be popularized and applied, accounting for less than 15% of polyurethane sole materials, and even just started in some countries or regions

[0004] The reason why polyether polyurethane has lower mechanical properties than polyester polyurethane is that on the one hand, it is determined by its own structural difference. Polyester itself contains hydrogen atoms, which can easily form hydrogen bonds with isocyanates to increase cohesive energy; on the other hand It is related to the synthesis process and quality of polyether. Ordinary polyether is prepared by using potassium hydroxide as an initiator to propoxylate a polyhydroxy initiator. In this reaction, monomer propylene oxide isomerized to form propylene The side reaction of alcohol, which leads to the formation of terminal unsaturated double bonds, affects the growth of molecular chains, resulting in performance degradation

Although the process method is continuously improved, and bimetallic catalysts and ethylene oxide end capping are used to synthesize polyethers with low unsaturation and high activity, the formation of unsaturated bonds is unavoidable, and there are also large differences in the quality of various products. difference

[0005] CN1453299A discloses a kind of preparation method of polyether type shoe sole, although product performance is better, must use the novel low unsaturation, high activity polyether polyol that double metal cyanide catalyzes synthesis, compare the trade mark and quality requirement of raw material harsh

[0006] CN1635026A discloses a kind of PU shoe sole polyurethane material, rubber and plastic series nano-modified synergist and its manufacturing method, but its preparation process is complicated, and it is not suitable to be produced by ordinary polyurethane shoe sole pouring machine

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