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High-resilience polyurethane/organic silicon thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and polyurethane technology, applied in the field of dynamic vulcanization thermoplastic elastomer, can solve the problems of being unsuitable for widespread industrialization, increasing preparation steps and equipment, unfavorable continuous industrial production, etc., and achieving easy control of crosslinking degree and more vulcanization reaction Excellent stability and prolonged vulcanization time

Active Publication Date: 2021-06-22
CHENGDU SILIKE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of carbon nanotubes is difficult and expensive, and it is not suitable for widespread industrialization.
Patent CN 109553982 improves the viscosity ratio of silicone rubber and polyurethane by pre-crosslinking, and patent CN 108587123 increases the viscosity of silicone rubber by pre-crosslinking; but these two methods must first add crosslinking agent (chain extender) in silicone rubber ) for high temperature pre-crosslinking, this method increases the preparation steps and equipment, which is not conducive to continuous industrial production

Method used

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  • High-resilience polyurethane/organic silicon thermoplastic elastomer and preparation method thereof
  • High-resilience polyurethane/organic silicon thermoplastic elastomer and preparation method thereof
  • High-resilience polyurethane/organic silicon thermoplastic elastomer and preparation method thereof

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preparation example Construction

[0036] First, the present invention provides a method for preparing a high resilience polyurethane / organic silicon thermoplastic elastomer, comprising the steps of:

[0037] S1 rubber and plastic blend

[0038] Blending thermoplastic polyurethane, vinyl silicone rubber, compatibilizer, and reinforcing filler, and pre-mixing in an internal mixer, cooling down after mixing, adding a cross-linking agent and continuing mixing to obtain a rubber-plastic blend;

[0039] S2 pre-crosslinked

[0040] Add the rubber-plastic blend in S1 into a twin-screw extruder, add a prepolymerization catalyst to the front of the twin-screw extruder for pre-vulcanization, and shear and disperse to obtain a pre-vulcanized cross-linked product;

[0041] S3 dynamic vulcanization

[0042] When the pre-vulcanized cross-linked product in S2 passes through the middle section of the screw in the twin-screw extruder, a dynamic vulcanization catalyst is added, sheared and dispersed, and then granulated to obt...

Embodiment 1

[0087] A preparation method of high resilience polyurethane / organic silicon thermoplastic elastomer, comprising the steps of: 100 parts of TPU after drying, 100 parts of methyl vinyl silicone rubber 1 and 10 parts of reactive compatibilizer 1, 10 parts Reinforcing filler 1, 3 parts of cross-linking agent 1 are mixed uniformly in the mixer of the torque rheometer at 180°C and 120rpm, and then 0.8 parts of pre-polymerization catalyst 1 are added first, under the shearing action of the mixing device, and then at temperature Mix at 180°C and 120rpm for about 1min, then add 2.5 parts of dynamic vulcanization catalyst 1, and continue dynamic vulcanization to obtain high resilience polyurethane / silicon thermoplastic elastomer.

Embodiment 2

[0089] A preparation method of high resilience polyurethane / organic silicon thermoplastic elastomer, comprising the steps of: 100 parts of TPU after drying, 100 parts of methyl vinyl silicone rubber 2 and 15 parts of reactive compatibilizer 1, 18 parts Reinforcing filler 2 and 2 parts of crosslinking agent 2 are mixed evenly in the mixer of the torque rheometer at 190 ° C and 100 rpm, and then 0.5 parts of pre-polymerization catalyst 1 are added first. ℃, 120rpm, first mix for about 1min, then add 3 parts of dynamic vulcanization catalyst 1, and continue dynamic vulcanization to obtain high resilience polyurethane / silicon thermoplastic elastomer.

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Abstract

The invention relates to the technical field of dynamically vulcanized thermoplastic elastomers, and discloses a high-resilience polyurethane / organic silicon thermoplastic elastomer and a preparation method thereof.The preparation method comprises the steps that blending thermoplastic polyurethane, vinyl silicone rubber, a compatilizer and reinforcing filler, placing a product in an internal mixer to be premixed, adding a cross-linking agent, uniform mixing continuesly to obtain rubber and plastic blend; adding the rubber and plastic blend into a twin-screw extruder, adding a prepolymerization catalyst, and carrying out prevulcanization and shear dispersion treatment; when a pre-vulcanized cross-linked product passes through the screw middle section of the double-screw extruder, adding a dynamic vulcanization catalyst, and carrying out shearing dispersion treatment to obtain the polyurethane / organic silicon thermoplastic elastomer; wherein the prepolymerization catalyst and the dynamic vulcanization catalyst are both rubber compounds formed by mixing a catalyst and vinyl silicone rubber. The catalyst is added in batches, so that the silicon rubber can be dispersed in the polyurethane, and the vulcanization rate can be reduced; by adopting the catalyst masterbatch, the uniform particle size of the silicon rubber can be ensured, so that the prepared TPSiV is silky in hand feeling.

Description

technical field [0001] The invention belongs to the technical field of dynamically vulcanized thermoplastic elastomers, and in particular relates to a high resilience polyurethane / organic silicon thermoplastic elastomer and a preparation method thereof. Background technique [0002] Dynamic vulcanization is to melt and blend the vulcanizable rubber phase, thermoplastic resin or elastomer, and vulcanizing agent at high temperature, and at the same time, the rubber phase undergoes a synchronous cross-linking reaction. With the action of high shear, the cross-linked rubber phase is sheared into Micron-sized particles are dispersed in the resin. Dynamically vulcanized thermoplastic elastomer (TPV) not only has the physical and mechanical properties of thermosetting rubber, but also has the flow processability of thermoplastics, and has the advantages of repeatable processing and recyclable use. It has been widely used in the automotive industry, building materials, medical area...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L75/06C08L83/07C08L83/05C08J3/24
CPCC08J3/246C08J3/244C08J2375/08C08J2375/06C08J2483/07C08J2483/05C08J2383/07C08J2475/08C08J2475/06Y02W30/62
Inventor 徐龙平王欣何雅僖谢刚
Owner CHENGDU SILIKE TECH
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