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Silicone rubber/polyurethane thermoplastic vulcanized rubber as well as preparation method and application thereof

A thermoplastic vulcanizate and silicone rubber technology, applied in the field of polymer materials, can solve problems such as poor performance, insufficient phase state, and SiR is not easy to disperse and break, achieve excellent mechanical properties and elasticity, simple and easy preparation process, cross-linking Easy-to-control effects

Active Publication Date: 2020-12-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since silicone rubber (SiR) is a non-polar material and polyurethane is a polar material, the compatibility between the two is poor. Therefore, when preparing SiR / TPU thermoplastic vulcanizate (TPV), it is easy to cause SiR to be difficult to disperse and break, and the phase state is not enough. fine, poor performance
[0004] U.S. Patent US6759487A discloses a method for preparing polyurethane / silicone rubber thermoplastic elastomers. The hydrosilylation system is selected as the vulcanization system, and TPU, silicone rubber, and reinforcing fillers are melt-blended, but it is not considered that TPU will cause platinum catalyst poisoning The problem; Chinese patent CN102153853A discloses a preparation method of silicone rubber / polyurethane thermoplastic elastomer, after melting and blending TPU, silicone rubber, compatibilizer, crosslinking agent (hydrogen-containing silicone oil), adding a platinum catalyst for dynamic vulcanization , but the activity of the platinum catalyst is high, and the silicone rubber can be quickly cross-linked at room temperature, and it is difficult to disperse evenly in the TPU matrix; Add methyl vinyl silicone rubber raw rubber, knead with TPU after kneading, but this kneading rubber does not add compatibilizer, so there is still the problem of poor compatibility and cannot be reprocessed

Method used

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  • Silicone rubber/polyurethane thermoplastic vulcanized rubber as well as preparation method and application thereof
  • Silicone rubber/polyurethane thermoplastic vulcanized rubber as well as preparation method and application thereof
  • Silicone rubber/polyurethane thermoplastic vulcanized rubber as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Raw material composition and mass parts are as follows:

[0052]

[0053] Preparation of compatibilizer

[0054] At room temperature, first dissolve 10g of double-ended aminomethyl vinyl polysiloxane and 15g of double-ended amino polybutadiene in a mixed solution of 15gTHF and 10gDMF, and dissolve 1g of toluene diisocyanate with 4g of toluene solution at 70°C. 0.5g of ethylenediamine was added together to react for 4 hours to obtain a compatibilizer. The stirring speed was 350rad / min. The polymer solution was naturally cooled and left at room temperature for 6 hours. The copolymer was placed in ethanol / water (1:1) solution to precipitate, Wash and dry in a vacuum oven at 70°C for 15 hours. The siloxane content in the obtained compatibilizer is 22.7%, the ratio of soft and hard segments is 1:0.05, and the number average molecular weight is 1.8×10 4 .

[0055] Preparation of Silicone Rubber / Polyurethane Thermoplastic Vulcanizates

[0056] According to the above for...

Embodiment 2

[0058] Raw material composition and mass parts are as follows:

[0059]

[0060] Preparation of compatibilizer

[0061] At room temperature, first dissolve 8g of double-ended aminomethyl vinyl polysiloxane and 15g of double-ended hydroxyl polybutadiene in a mixed solution of 10gTHF, 5g of toluene and 10g of xylene, and dissolve 0.5g of diphenyl with 2g of toluene solution. Add methane diisocyanate and 0.4g ethylene glycol at 80°C and react for 4 hours to obtain a compatibilizer at a stirring speed of 450rad / min; cool the polymer solution naturally and place it at room temperature for 6 hours, and place the copolymer in ethanol / water (1:1) solution for precipitation, washing, and drying in a vacuum oven at 75°C for 15h. The siloxane content in the obtained compatibilizer is 25.8%, the ratio of soft and hard segments is 1:0.039, and the number average molecular weight is 1.5×10 4 .

[0062] Preparation of Silicone Rubber / Polyurethane Thermoplastic Vulcanizates

[0063] Ac...

Embodiment 3

[0065] Raw material composition and mass parts are as follows:

[0066]

[0067] Preparation of compatibilizer

[0068] At room temperature, first dissolve 15g of double-terminal hydroxymethyl vinyl polysiloxane and 10g of double-terminal hydroxyl polybutadiene in a mixed solution of 25gDMF and 25gDMAC, and dissolve 0.6g of hexamethylene diisocyanate with 3g of toluene solution. At 75°C, add 0.8g of butanediol and react for 5 hours to obtain a compatibilizer. The stirring speed is 400rad / min; the polymer solution is naturally cooled and left at room temperature for 6 hours, and the copolymer is placed in ethanol / water (1:1) Precipitate in the solution, wash, and dry in a vacuum oven at 80°C for 15 hours. The siloxane content in the obtained compatibilizer is 20.4%, the ratio of soft and hard segments is 1:0.056, and the number average molecular weight is 2.2×10 4 .

[0069] Preparation of Silicone Rubber / Polyurethane Thermoplastic Vulcanizates

[0070] Melt blend 70 par...

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Abstract

The invention provides silicone rubber / polyurethane thermoplastic vulcanized rubber and a preparation method thereof. According to the invention, a block copolymer of organosiloxane is used as a compatibilizer to improve the compatibility of silicone rubber and polyurethane; and meanwhile, through a new dynamic vulcanization process design, the polyurethane is partially isolated from a platinum catalyst, so that the influence of the polyurethane on the platinum catalyst is reduced, and the material performance is improved. The silicone rubber / polyurethane thermoplastic vulcanized rubber provided by the invention has excellent mechanical properties and elasticity, and the extrusion surface is smooth.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a silicone rubber / polyurethane thermoplastic vulcanizate and its preparation method and application. Background technique [0002] Thermoplastic vulcanizate is a special thermoplastic elastomer. Through dynamic vulcanization technology, a large amount of rubber particles (50-80wt%) and a small amount (20-50wt%) of plastic phases undergo phase inversion during melt blending, and finally a large amount of The rubber phase is broken into micron particles and uniformly dispersed in a small amount of plastic phase, forming a special sea-island structure. TPV prepared by dynamic vulcanization not only maintains the good processability and recyclability of thermoplastics, but also has the elasticity and mechanical properties of high-crosslinked rubber in use, so it is widely used as a "green" elastomer material. Used in automobiles, construction, wire and cable and other fi...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08L83/08C08L75/08C08L75/06C08L75/14C08G18/69C08G18/67C08G18/32B29B15/00
CPCC08L83/04C08L83/08C08L75/08C08G18/6705C08G18/698C08G18/3228C08G18/3206B29B15/00C08L2205/025C08L2205/035C08L2205/08C08L2203/202C08L75/14C08L75/06
Inventor 宁南英郝倩田明张立群于冰赵勇
Owner BEIJING UNIV OF CHEM TECH
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