Dynamic vulcanized silicone rubber/thermoplastic polyurethane elastomer and preparation method thereof

Abstract

The invention provides a dynamic vulcanized silicone rubber / thermoplastic polyurethane elastomer material and a preparation method thereof. The material is prepared, by weight, the following components: vinyl polysiloxane: 100 parts, thermoplastic polyurethane elastomer: 10-500 parts, compatibilizer: 3-30 parts, hydrogen-containing silicone oil: 0.1-15 parts, platinum-based catalyst: 0.1-100 ppm (content of platinum atom in the vinyl polysiloxane and hydrogen-containing silicone oil), anti-poison agent: 0.1-20 parts. In the preparation process, no hydrogen is generated, and the process is simple and safe. The product integrates the advantages of two materials of silicon rubber and TPU, has excellent surface hand feeling, has excellent adhesion with PC, PC / ABS, ABS and the like, is easy toextrude and formed through injection molding, the additive amount of the platinum-based catalyst is low in the preparation process, the product has excellent endurance performance and low cost, and can be widely applied to the fields of intelligent wearable products and electronic and appliance products and the like with relatively high requirements.

Description

technical field [0001] The invention relates to a dynamic vulcanized silicone rubber / thermoplastic polyurethane elastomer material and a preparation method thereof, belonging to the technical field of thermoplastic elastomer material production. Background technique [0002] Dynamic vulcanization refers to the cross-linking reaction between the rubber phase and the thermoplastic resin during melt blending, and at the same time under the action of high temperature and high shear, the cross-linked rubber is sheared into micron-sized particles and dispersed in the resin. The dynamically vulcanized thermoplastic elastomer (TPV) prepared by this method not only has the physical and mechanical properties of thermosetting rubber, but also has the flow processability of thermoplastics, and has better processing and use properties than simple blended thermoplastic elastomers. With the advantages of processing, recyclability, and excellent comprehensive performance, it has been widely...

AI Technical Summary

Problems solved by technology

Among them, peroxide will not only make silicone rubber vulcanized and crosslinked, but also cause TPU to be crosslinked, so that TPSiV material does not have processability, so silicone rubber vulcanized by peroxide cannot be used as a raw material for TPU-based TPSiV

[0004] U.S. Patent No. 6,153,691 uses silanol-terminated organopolysiloxane and thermoplastic polyurethane elastomer to prepare thermoplastic silicone elastomer TPSiV by dynamic vulcanization. Hydrogen condensation reaction is used to carry out the cross-linking of organopolysiloxane. The TPU-based TPSiV product prepared by this method has a high cross-linking degree and excellent resilience performance, but the product will generate hydrogen gas during the condensation reaction, which needs to be carried out. The recovery of hydrogen leads to a more complicated production process of the product, and at the same time, it is prone to safety risks

[0005] Li Shanliang from Guangdong University of Technology used vinyl silicone rubber and thermoplastic polyurethane elastomer TPU to prepare thermoplastic silicone elastomer TPSiV by dynamic vulcanization. Addition reaction of hydrogen silicone oil for dynamic vulcanization of silicone rubber (Li Shanliang, Preparation and performance research of polyurethane / silicone rubber dynamic vulcanization thermoplastic elastomer, master's degree thesis of Guangdong University of Technology, 2011), currently in addition polysiloxane In the catalytic system, in addition to platinum-based catalysts, other metal catalysts such as cobalt, ruthenium, rhodium, etc., these catalysts have lower catalytic efficiency and higher cost than platinum-based catalysts, so the current industrial application of silicone rubber catalysts is only platinum However, platinum-based catalysts have a big weakness, that is, organic compounds containing elements such as N, P, and S, or ionic compounds of heavy metals such as Sn, Pb, Hg, Bi, As, and unsaturated organic compounds containing alkyne groups. When in contact, these elements or compounds have lone pairs of electrons, which are easy to combine with the d-orbital electrons of platinum metal to form a strong adsorption bond, which will poison and invalidate platinum-based catalysts, especially ionic compounds of heavy metals, which may lead to platinum-based catalysts. Permanent failure, platinum-based catalysts are easily poisoned, resulting in low or no cross-linking of polysiloxane. Products with low cross-linking degrees will not only lead to larger permanent compression deformation of TPSiV products, but also make the surface of the product sticky. Seriously affect the surface feel of the material

In the production process of TPU, a certain amount of organotin catalysts will be added to speed up the reaction speed of the product, but organotin catalysts will cause poisoning of platinum-based catalysts and affect the activity of platinum-based catalysts. At present, only by adding a large amount Platinum-based catalysts are used to compensate for the influence of TPU catalysts on platinum-based catalysts, but this will lead to a high content of total catalyst in the TPSiV system. On the one hand, it will accelerate the degradation of the TPU continuous phase in TPSiV and affect the durable use of TPSiV. At the same time, due to the high price of platinum-based catalysts, adding a large amount of platinum-based catalysts will increase the cost of TPU-based TPSiV products

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