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 s

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] First, the present invention provides a preparation method of high back elastic polyurethane / silicone thermoplastic elastomers, including the following steps:

[0037] S1 rubber

[0038] The thermoplastic polyurethane, vinyl silicone rubber, compatible agent, and reinforcing filler were blended, and premixed in a mesh, mixed, and then cool down, and the crosslinking agent continued mixed to obtain a rubber blend;

[0039] S2 pre-association

[0040] The rubber mold blend in S1 is added to the twin screw extruder, and the prepolymerized catalyst is added to the front section of the screw extruder to perform pre-vulcanization, and the dispersion treatment is obtained.

[0041] S3 dynamic vulcanization

[0042] When the pre-sulfurized crosslinker in S2 is in the middle of the twin screw extruder, a dynamic vulcanization catalyst is added, and the dispersion treatment is applied, and the polyurethane / silicone thermoplastic elastomer is obtained by granulation;

[0043] Amon...

Example Embodiment

[0086] Example 1

[0087] Preparation method of high-back elastic polyurethane / silicone thermoplastic elastomer, including 1,10 parts of 100 parts of TPU 1,100 parts of methyl vinyl silicone rubber 1 and 10 parts after drying 1,10 parts Enhanced filler 1,3 part of the crosslinker 1 in a mixer of the torque stream, mixed with a mixture of 120 rpm, first add 0.8 parts of the prepolymer catalyst 1, under the shear of the mixing device, then temperature 180 ° C, 120 rpm was mixed with 1 min, then 2.5 parts dynamic vulcanization catalyst 1 was added, and dynamic vulcanization was continued to give high-return elastic polyurethane / silicone thermoplastic elastomer.

Example Embodiment

[0088] Example 2

[0089] Preparation method of high back elastic polyurethane / silicone thermoplastic elastomer, including 1,18 parts of 100 parts of TPU 1,100 parts of methyl vinyl silicone rubber 2 and 15 parts after drying Enhanced filler 2,2 parts of the crosslinking agent 2 in a mixer of the torque stream, 1 rpm is mixed under 100 rpm, first add 0.5 parts of the prepolymerization catalyst 1, under shear of the mixing device, at temperature 180 At ° C, 120 rpm was mixed with 1 min, then 3 dynamic vulcanization catalyst 1 was added, and dynamic vulcanization was continued to obtain a high-return elastic polyurethane / silicone 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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