A kind of dynamically vulcanized thermoplastic polyurethane/polysiloxane elastomer and its preparation method

Abstract

The preparation method of a dynamically vulcanized thermoplastic polyurethane / polysiloxane elastomer disclosed by the invention is to premix thermoplastic polyurethane, methyl vinyl siloxane, reinforcing filler and chain extender together with a catalyst in a banbury mixer Or melt extrusion granulation in twin-screw extruder to prepare polysiloxane masterbatch, then mix thermoplastic polyurethane, polysiloxane masterbatch, compatibilizer and polymerization inhibitor evenly, add crosslinking agent and catalyst Perform dynamic vulcanization. Since the methyl vinyl siloxane used in the preparation of the masterbatch has a low viscosity, it is easy to disperse well, and at the same time it can achieve chain growth under the action of a catalyst, increasing the viscosity and molecular weight of the polysiloxane, so the resulting elastomer can have better properties. Excellent mechanical properties and smooth feel, easy to process, can be used in high-demand applications such as construction, auto parts, wires and cables, medical devices, and wearable devices.

Description

Technical field [0001] The present invention is belonging to the thermoplastic elastomer and the preparation of the preparation of the present invention, and in particular, the present invention relates to a dynamic vulcanized thermoplastic polyurethane / polysiloxane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane (TPU) is a molecular chain containing a number of repeating carbamate groups (-NH-COO-), and alternately coupled by a flexible segment and a rigid segment (AB) n-type block Copolymer. Among them, the rigid segment is an elastic crosslinking point at normal temperature to make it a resilient material between general rubber and plastic. The TPU elastomer has a wide range of hardness, although its application is very wide, such as automotive parts, industrial hose, gears, shoe materials, etc., but in some special elastic materials applications, such as wearable equipment accessories, car interior parts And cable sheath ...

AI Technical Summary

Problems solved by technology

However, this invention still does not improve the compatibility of polysiloxane and organic polymer matrix, and it is prone to phase separation or poor interfacial bonding.

Chinese patent CN102153853 provides a silicone rubber / polyurethane thermoplastic elastomer, and a certain amount of silicon-modified polyurethane is added to the formula as a compatibilizer, but due to the large difference in viscosity between silicone rubber and polyurethane, there is still the problem of poor dispersion

Since the above technical solutions all adopt the direct addition of silicone rubber as the rubber phase, there will be some problems: ①Because of the high molecular weight and high viscosity of silicone rubber, it is difficult to directly add materials, and special feeding and processing equipment are required. high investment

②Because silicone rubber does not have the fluidity of thermoplastic resin at high temperature, the viscosity of the resin matrix is ​​quite different, and it is difficult to disperse evenly, so that the performance of the thermoplastic elastomer obtained cannot be guaranteed

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