High-hardness thermoplastic polyurethane elastomer and preparation method thereof

Abstract

The invention belongs to the field of macromolecule material synthesis and relates to a high-hardness thermoplastic polyurethane elastomer and a preparation method thereof. The elastomer is prepared from the following raw materials in parts by mass: 40-65% of polyester type diol, 25-45% of diisocyanate, 5-15% of a chain expander, 0.1-0.5% of an antioxidant, 0.1-0.5% of a light stabilizer and 0.005-0.05% of a catalyst, wherein the polyester type diol is prepared from a binary acid component and a diol component; the binary acid component comprises terephthalic acid; and the terephthalic acid accounts for 1-15% of the total weight of the binary acid. According to the elastomer, a benzene ring containing polyester polyhydric alcohol is introduced into a TPU (Thermoplastic Polyurethane) soft section, then the rigidity of a TPU chain section can be improved, relatively high product rigidity can be achieved under a relatively low hard section content condition, a TPU product has a relativelylow processing temperature, a material is prevented from thermal oxydative degradation under a high-temperature condition, high processing properties can be achieved, and the cost is low. The invention further provides a preparation method of the elastomer.

Description

technical field [0001] The invention belongs to the field of polymer material synthesis, and in particular relates to a high-hardness thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) is a kind of polyurethane material that can be plasticized by heating and can be dissolved by solvent. It has a unique soft and hard block copolymer structure, because it has both the elasticity of rubber and the processability of plastic. It is widely used in many fields. The hardness of TPU ranges from Shore A60 to Shore D80. It has good elasticity in the entire hardness range, and has good weather resistance, wear resistance, tear resistance, high tensile strength, and large elongation. . However, when the hardness of TPU reaches a certain level, its processing performance begins to deteriorate. The processing temperature needs to be as high as 230°C, and the processing temperature range is narrow...

AI Technical Summary

Problems solved by technology

However, when the hardness of TPU reaches a certain level, its processing performance begins to deteriorate. The processing temperature needs to be as high as 230°C, and the processing temperature range is narrow, which greatly limits the application of high hardness TPU.

In addition, TPU materials are prone to thermal degradation after high-temperature plasticization, resulting in a decrease in the performance of the material and reducing the number of times the material can be recycled.

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