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Silicon rubber/polypropylene thermoplastic vulcanizate and preparation method thereof

A technology of thermoplastic vulcanizate and polypropylene, which is applied in the field of polymer material processing, can solve the problems of reducing material elasticity and high temperature resistance, limited compatibilizing effect, and large molecular weight of compatibilizer, etc., and achieves excellent sealing performance and good physical mechanics performance effect

Active Publication Date: 2019-07-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the added compatibilizer is graft-modified polyolefin, the compatibilizer has a large molecular weight, so the compatibilization effect is limited. At the same time, the addition of halogen-free flame retardant reduces the elasticity and high temperature resistance of the material

Method used

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  • Silicon rubber/polypropylene thermoplastic vulcanizate and preparation method thereof
  • Silicon rubber/polypropylene thermoplastic vulcanizate and preparation method thereof
  • Silicon rubber/polypropylene thermoplastic vulcanizate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The basic composition and mass parts of the selected raw materials are as follows:

[0039]

[0040] According to the above formula, the silane-modified white carbon black and the methyl vinyl silicone rubber were fully mixed uniformly in an internal mixer at room temperature and 70 rpm to prepare a silicone rubber compound with a relatively high viscosity. Mix polypropylene and methyl vinyl silicone rubber at 220°C, add polypropylene grafted maleic anhydride, epoxy silicone oil, octadecyl dimethyl tertiary amine and antioxidant 1010 in proportion, wait until After mixing evenly, discharge the material and cool it to room temperature; then mix it evenly with vulcanizing agent and polymerization inhibitor at room temperature to obtain a rubber-plastic premix; put the rubber-plastic premix in a twin-screw extruder, and set the vulcanization temperature to 240°C , with a rotating speed of 500 rpm, and dynamic vulcanization to obtain a silicone rubber / polypropylene therm...

Embodiment 2

[0044] The basic composition and mass parts of the selected raw materials are as follows:

[0045]

[0046] According to the above formula, the silane-modified silica and methyl vinyl silicone rubber were fully mixed evenly in an internal mixer at room temperature and 70 rpm to prepare a silicone rubber compound with relatively high viscosity. Mix polypropylene and methyl vinyl silicone rubber at 180°C, add polypropylene grafted maleic anhydride, ethylene-methyl acrylate-glycidyl methacrylate random terpolymer, three Ethylamine and antioxidant 1010, after being mixed uniformly, the material is discharged and cooled to room temperature; then mixed with vulcanizing agent and polymerization inhibitor at room temperature to obtain a rubber-plastic premix; the rubber-plastic premix is ​​placed in a twin-screw extruder In the machine, set the vulcanization temperature to 200°C and the rotation speed to 500rpm, and dynamically vulcanize to obtain a silicone rubber / polypropylene ther...

Embodiment 3

[0050] The basic composition and mass parts of the selected raw materials are as follows:

[0051]

[0052]

[0053] According to the above formula, the silane-modified white carbon black and methyl vinyl phenyl silicone rubber were fully mixed evenly in an internal mixer at room temperature and 70 rpm to prepare a silicone rubber compound with relatively high viscosity. Mix polypropylene and methyl vinyl phenyl silicone rubber compound at 260°C, add polypropylene grafted maleic anhydride, ethylene-methyl acrylate-glycidyl methacrylate random terpolymer in proportion , octadecyl dimethyl tertiary amine and antioxidant 1010, after being mixed evenly, the material is discharged and cooled to room temperature; then mixed with vulcanizing agent and polymerization inhibitor at room temperature to obtain a rubber-plastic premix; the rubber-plastic The premix was placed in a twin-screw extruder, the vulcanization temperature was set at 280° C., and the rotation speed was 700 rp...

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PUM

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Abstract

The invention relates to a silicone rubber / polypropylene thermoplastic vulcanizate and a preparation method thereof. The thermoplastic vulcanizate comprises silicone rubber, polypropylene, a filler, an antioxidant, a vulcanizing agent, a polymerization inhibitor and a compatibilizer, wherein a catalytic reaction product of epoxy silicone oil or ethylene methyl acrylate-glycidyl methacrylate randomterpolymer and polypropylene and grafted maleic anhydride under the action of a catalyst is used as a compatibilizer, the filler is added to the silicone rubber to increase the viscosity of siliconerubber, and the compatibility of the silicone rubber with the polypropylene and the viscosity ratio of the two are improved; through the dynamic vulcanization technology, the prepared thermoplastic vulcanizate has a fine structure, excellent mechanical properties and elasticity, has good high temperature resistance and excellent chemical stability, and can be widely used in automobiles, medical instruments, wearable devices and the like.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a silicone rubber / polypropylene thermoplastic vulcanizate and a preparation method thereof. Background technique [0002] Thermoplastic vulcanizate is a special thermoplastic elastomer obtained by dynamic vulcanization reaction processing technology. When a small amount of plastic phase is melt-blended with a large amount of rubber, the rubber is chemically cross-linked under the action of the cross-linking agent, and the viscosity increases. Therefore, under the action of high-temperature mechanical shear, the phase inversion of the rubber-plastic blend occurs, and a large amount The rubber phase is broken into micron particles and uniformly dispersed in a small amount of plastic phase, and the rubber is cross-linked to form a special sea-island structure. This special structure makes thermoplastic vulcanizate not only have the high elasticity and softness of traditio...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08L83/08C08L23/12C08L87/00C08K13/06C08K9/06C08K3/36C08K3/34C08G81/02
CPCC08G81/021C08G81/024C08L83/04C08L83/08C08L2205/08C08L23/12C08L87/005C08K13/06C08K9/06C08K3/36C08K3/346
Inventor 田明王瀚彬宁南英张立群田洪池
Owner BEIJING UNIV OF CHEM TECH
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