Method for preparing novel foaming thermoplastic polyurethane elastomer material

Abstract

The invention discloses a method for preparing a novel foaming thermoplastic polyurethane (F-TPU) elastomer material. The material is a microporous polyurethane foaming material produced by a polymer polymerization reaction of a polyester polyol and isocyanate under the action of a catalyst and various additives. The method comprises the following steps: introducing a component A respectively through a measuring tank into a feed end of a first single screw extruder for a prepolymerization reaction, wherein the component A comprises the polyester polyol, a crosslinking agent and isocyanate; adding a component B to a discharge end of the first single screw extruder and introducing the component B and the component A after reaction into a feed end of a second screw extruder; and performing a polymerization reaction for the component A and the component B under the extruding of the second screw extruder, and extruding the material from a discharge end of the second screw extruder after reacting sufficiently. According to the method of the present invention, the density of the prepared TPU material is decreased to 500 kg / m3 or less, the TPU material is uniform in foaming and the method has the advantages of no pollution and simple process.

Description

technical field [0001] The invention relates to the technical field of organic polymer chemical industry, in particular to a preparation method of a foamed thermoplastic polyurethane elastomer material (new F-TPU material). Background technique [0002] TPU is the abbreviation of Thermoplastic Urethane. The Chinese name is thermoplastic polyurethane elastomer. TPU is a polymer formed by the reaction and polymerization of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), macromolecular polyol and chain extender. Material. [0003] At present, the production process of TPU in the market is complicated and the production cost is high. During the preparation process, toxic gases and liquids will be produced, which will pollute the environment and cause harm to the health of on-site workers. When the TPU foam material is foamed outside the mold, the bridging degree is linearly related to the melt viscosity of the colloid. If the foaming is too early than the vulcan...

AI Technical Summary

Problems solved by technology

Foaming TPU with commonly used blowing agents such as azodicarbonamide or sodium bicarbonate-based products has not been successful in reducing the density of molded parts to 500 kg / m 3 the following

In addition, when the existing TPU material is foamed and molded in the mold, it cannot achieve 1:1 foam molding, resulting in shrinkage of the molded product, which seriously affects the yield

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