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A kind of high resilience polyurethane/organosilicon 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 increasing preparation steps and equipment, being unsuitable for widespread industrialization, unfavorable for continuous industrial production, etc., achieving easy control of crosslinking degree and more vulcanization reaction Excellent stability and prolonged vulcanization time

Active Publication Date: 2022-07-05
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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  • A kind of high resilience polyurethane/organosilicon thermoplastic elastomer and preparation method thereof
  • A kind of high resilience polyurethane/organosilicon thermoplastic elastomer and preparation method thereof
  • A kind of high resilience polyurethane/organosilicon 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 / organosilicon thermoplastic elastomer, comprising the following steps:

[0037] S1 rubber-plastic blending

[0038] Blend thermoplastic polyurethane, vinyl silicone rubber, compatibilizer, and reinforcing filler, and place them in an internal mixer for pre-mixing. After mixing, the temperature is lowered, and a cross-linking agent is added to continue mixing to obtain a rubber-plastic blend;

[0039] S2 pre-crosslinking

[0040] Adding the rubber-plastic blend in S1 into a twin-screw extruder, adding a pre-polymerization catalyst to the front of the screw of the twin-screw extruder for pre-vulcanization, and shearing and dispersing 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...

Embodiment 1

[0087] A method for preparing a high-resilience polyurethane / organosilicon thermoplastic elastomer, comprising the following steps: 100 parts of TPU 1, 100 parts of methyl vinyl silicone rubber 1 and 10 parts of reactive compatibilizers 1, 10 parts of dried Reinforcing filler 1 and 3 parts of cross-linking agent 1 are mixed uniformly in the mixer of the torque rheometer at 180 ° C and 120 rpm, firstly add 0.8 part of prepolymerization catalyst 1, under the shearing action of the mixing device, and then at the temperature At 180° C. and 120 rpm, the mixture was first mixed for about 1 min, and then 2.5 parts of the dynamic vulcanization catalyst 1 was added, and the dynamic vulcanization was continued to obtain a high-resilience polyurethane / organosilicon thermoplastic elastomer.

Embodiment 2

[0089] A method for preparing a high-resilience polyurethane / organosilicon thermoplastic elastomer, comprising the following steps: 100 parts of TPU 1, 100 parts of methyl vinyl silicone rubber 2 and 15 parts of reactive compatibilizer 1, 18 parts of dried Reinforcing filler 2 and 2 parts of crosslinking agent 2 were mixed uniformly in the mixer of the torque rheometer at 190 ° C and 100 rpm, and then 0.5 part of prepolymerization catalyst 1 was added first, and under the shearing action of the mixing device, the temperature was 180 ℃, at 120 rpm, first mix for about 1 min, then add 3 parts of dynamic vulcanization catalyst 1, and continue dynamic vulcanization to obtain a high-resilience polyurethane / organosilicon 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 / organosilicon thermoplastic elastomer and a preparation method thereof. Thermoplastic polyurethane, vinyl silicone rubber, compatibilizers and reinforcing fillers are blended and placed in Banbury. Pre-mix in the machine, add cross-linking agent and continue to mix to obtain a rubber-plastic blend; add the rubber-plastic blend to a twin-screw extruder, add a pre-polymerization catalyst for pre-vulcanization, shear and disperse; When the vulcanized cross-linked product passes through the middle section of the screw in the twin-screw extruder, a dynamic vulcanization catalyst is added, sheared and dispersed to obtain a polyurethane / organosilicon thermoplastic elastomer; the prepolymerization catalyst and the dynamic vulcanization catalyst are both catalysts and vinyl silicone rubber. Mixed rubber formed by mixing. In the present application, by adding the catalyst in batches, the silicone rubber can be dispersed in the polyurethane, and the vulcanization rate can be reduced; the use of the catalyst masterbatch can ensure the uniform particle size of the silicone rubber, so that the prepared TPSiV feels silky.

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 / organosilicon thermoplastic elastomer and a preparation method thereof. Background technique [0002] Dynamic vulcanization is a high-temperature melt blending of the vulcanizable rubber phase, thermoplastic resin or elastomer, and vulcanizing agent, and at the same time, the rubber phase undergoes a synchronous cross-linking reaction. 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 also has the advantages of repeatable processing and recyclability. It has been widely used in the automotive industry, building materials, medical areas such as hygiene and wearables. [0003] The elastomer material (TPSiV) pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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