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Hydrophobic sulfydryl-modified silicone rubber and preparation method thereof

A modified silicon and hydrophilic technology, applied in the field of surface modified vulcanized silicone rubber and its preparation, can solve the problems of low surface free energy of silicone rubber, and achieve the effects of high hydrophilicity, simple process and mild reaction conditions

Inactive Publication Date: 2016-10-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface free energy of silicone rubber is low and the surface of the material is hydrophobic. Therefore, silicone rubber must be modified to be hydrophilic in order to be more widely used in the field of medical materials

Method used

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  • Hydrophobic sulfydryl-modified silicone rubber and preparation method thereof
  • Hydrophobic sulfydryl-modified silicone rubber and preparation method thereof
  • Hydrophobic sulfydryl-modified silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Get 0.8g tetramethylammonium hydroxide and 20g octamethylcyclotetrasiloxane, vacuum dehydrate at 50°C for 1h, then raise the temperature to 80°C for 1h, and prepare tetramethylammonium hydroxide silicon alkoxide (catalyst base glue). Then take 80g octamethylcyclotetrasiloxane (D 4 ), 20g tetramethyltetravinylcyclotetrasiloxane (V 4 ) and 0.1g of tetramethylhexasiloxane, dehydrated at 40°C for 3h under vacuum, then blown nitrogen gas, added 0.6g of tetramethylammonium hydroxide silicon alkoxide (alkali glue), and raised the temperature to 110°C, Reaction under normal pressure for 3h. After the reaction, the temperature was raised to 160°C, and the small molecules in the product were removed under vacuum for 3 hours, and then cooled to room temperature to obtain a methyl vinyl silicone rubber with a vinyl content of 20%. Take 40g of methyl vinyl silicone rubber, 16g of white carbon black, 2g of hydroxy silicone oil, 0.04g of 2,5-dimethyl-2,5-bis(tert-butyl peroxide) he...

Embodiment 2

[0023] Get 70g octamethylcyclotetrasiloxane (D 4 ), 30g tetramethyltetravinylcyclotetrasiloxane (V 4 ), dehydrated at 40°C for 2h under vacuum conditions, then passed nitrogen to normal pressure, added 0.6g tetramethylammonium hydroxide silicon alkoxide (alkali gel) and 0.1g tetramethylhexasiloxane, and heated to 120°C, reacted for 2h under normal pressure. After the reaction, the temperature was raised to 170°C, and the small molecules in the product were removed under vacuum for 3 hours, and then cooled to room temperature to obtain a methyl vinyl silicone rubber with a vinyl content of 30%. Take 20g of methyl vinyl silicone rubber, 8g of white carbon black, 1g of hydroxy silicone oil, 0.02g of 2,5-dimethyl-2,5-bis(tert-butyl peroxide) hexane and knead, and take 10g of mixed rubber Vulcanize at 160°C for 20min. Cut the vulcanized rubber into rubber sheets of 1cm*1cm, and wash them ultrasonically with ethanol for 10min. Add 5g of mercaptopropionic acid, 0.05g of benzoin d...

Embodiment 3

[0025] Get 50g octamethylcyclotetrasiloxane (D 4 ), 50g tetramethyltetravinylcyclotetrasiloxane (V 4 ), dehydrated at 45°C for 2h under vacuum conditions, then passed nitrogen to normal pressure, added 0.6g tetramethylammonium hydroxide silicon alkoxide (alkali gel) and 0.1g tetramethylhexasiloxane, and heated to 130°C, react under normal pressure for 3h. After the reaction, the temperature was raised to 160°C, and the small molecules in the product were removed under vacuum for 3 hours, and then cooled to room temperature to obtain a methyl vinyl silicone rubber with a vinyl content of 50%. Take 20g of methyl vinyl silicone rubber, 8g of white carbon black, 1g of hydroxy silicone oil, 0.02g of 2,5-dimethyl-2,5-bis(tert-butyl peroxide) hexane and knead, and take 10g of mixed rubber Vulcanize at 160°C for 20min. Cut the vulcanized rubber into rubber sheets of 1cm*1cm, and wash them ultrasonically with ethanol for 10min. Add 5g of mercaptopropionic acid, 0.05g of benzoin dim...

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Abstract

The invention relates to surface-modified vulcanized silicone rubber and a preparation method thereof, belonging to the field of preparation of a new material. The preparation method can be used for preparing a series of silicone rubber containing carboxyl and ester group by controlling reaction conditions and material proportions. The prepared sulfydryl-modified silicone rubber has relatively high molecular weight, and the number average molecular weight is more than 200000. By adding the carboxyl and ester group, the hydrophilicity of the surface of the silicone rubber can be well increased, so that the silicone rubber can be widely applied to the field of biomedical materials with relatively high hydrophilicity requirements. In addition, the molar fraction of the carboxyl or ester group on the molecular chain of the silicone rubber can be controlled by adjusting the content of double bonds in methyl vinyl silicone rubber. The carboxyl and ester group of the lateral chain of the sulfydryl-modified silicone rubber have certain reaction activity, and the application prospect of utilizing the carboxyl and ester group for modification so as to further improve the performance of the silicone rubber is excellent.

Description

technical field [0001] The invention relates to a surface-modified vulcanized silicone rubber and a preparation method thereof, belonging to the field of preparation of new materials. Background technique [0002] Silicone rubber is non-toxic, aging-resistant, and has excellent chemical stability. It can still maintain the original mechanical strength and rubber elasticity at high and low temperatures. At the same time, there is no obvious rejection reaction between the human body and silicone rubber. Therefore, silicone rubber is widely used Applied to medical products, it can be used as impression material, complete denture repair material, injected silicone rubber filling prosthesis, nasal prosthesis, balloon silicone rubber lung prosthesis, stomach tube, perfusion material of head and neck blood vessel specimens, etc. This requires medical materials to have good biocompatibility and anticoagulant properties. However, the surface free energy of silicone rubber is low, an...

Claims

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Application Information

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IPC IPC(8): C08G77/392C08G77/20C08L83/08C08L83/06C08K3/36C08K5/14
CPCC08G77/392C08G77/20C08L83/08C08L2205/02C08L83/06C08K3/36C08K5/14
Inventor 张立群于丽储俊峰
Owner BEIJING UNIV OF CHEM TECH
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