Low-glossiness thermoplastic polyurethane composition and preparation method and application thereof

Abstract

The invention relates to a low-glossiness thermoplastic polyurethane composition and a preparation method and application thereof. The low-glossiness thermoplastic polyurethane composition comprises, by mass percentage, 55-95% preferably 75-85% of thermoplastic polyurethane elastomer, 3-40% preferably 10-20% of thermoplastic polyester polymer and 0.5-10% preferably 2-5% of third component, wherein the third component is selected from one or more of organic acid salt, PTFE powder and ionomer. The preparation method includes: melting and blending the components according to a certain proportion to obtain composition granules, and using melt extrusion equipment to extrude sheets of about 1mm. The low-glossiness thermoplastic polyurethane composition has the advantages that standard ASTM D523 tests show that the 60-degree-angle surface glossiness of the composition is lower than 30Gs, and the composition is good in mechanical performance and machining performance, even and fine and smooth in surface dulling effect, smooth in touch and suitable for being used for producing cables, pipes, belts and thin film products.

Description

Technical field [0001] The invention relates to a thermoplastic polyurethane composition and a preparation method and application thereof, in particular to a thermoplastic polyurethane composition with low gloss and a preparation method and application thereof. Background technique [0002] Thermoplastic polyurethane is widely used in wire and cable sheaths below 1kV, and has good physical and mechanical properties. In the process of use, polyurethane has many advantages. It has good weather resistance, is not prone to aging, hardening and cracking, and has the same wear resistance, softness and good weather resistance as rubber, but its processing technology is simpler than rubber. It can be processed repeatedly like plastic materials without vulcanization. At the same time, it has excellent toughness, oil resistance, low temperature flexibility, thermal stability, etc. Therefore, it is widely used in power energy cables, communication cables, automotive cables, geological exp...

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Problems solved by technology

[0004] At present, the main means to solve the above needs is to add rubber powder with poor compatibility or elastomers that can form cross-linked structures, etc., such as patent CN102199343A by adding a certain amount of SEBS to achieve the purpose of extinction; patent CN103450662A by adding a certain amount of EPDM To achieve the purpose of matting, due to the poor compatibility between the matting agent and TPU, its addition amount is relatively high, resulting in a decrease in the mechanical properties of the material. Generally, a certain amount of compatibilizer needs to be added; at the same time, the rubber powder or cross-linked structural elastomer Poor processing performance, poor mixing uniformity, poor uniformity of matting effect, and there are problems such as rough surface and non-melting colloidal particles

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