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Medical one-component room temperature vulcanization silicone rubber and preparation method thereof

A technology of room temperature vulcanization and silicone rubber, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of irritating odor, high toxicity, poor adhesion, etc., and achieve the content of small molecule volatiles The effect of low cost, simple preparation method and improved safety

Inactive Publication Date: 2019-06-25
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercially available one-component room temperature vulcanized silicone rubber is mainly divided into three types: deketoxime type, dealcoholized type and deacetic acid type according to the small molecules released during the vulcanization process. The deketoxime type room temperature vulcanized silicone rubber is due to the release of The small molecule methyl ethyl ketone oxime is highly toxic, and its use has been restricted in Europe, so it cannot be used in the medical industry; the small molecule released during the vulcanization process of dealcoholized room temperature vulcanized silicone rubber is methanol or ethanol, and its adhesion is relatively poor , the application in the medical industry is limited; and the deacetate type RTV silicone rubber releases small molecules as acetic acid during the vulcanization process, and its toxicity is the lowest among the three types. Therefore, the one-component RTV silicone rubber currently used in the medical field is mainly a Acetic acid type
[0004] However, the currently commercially available RTV silicone rubbers still have the following problems: 1) Ordinary RTV silicone rubbers contain 1 to 3% small molecule volatiles, most of which are siloxane small molecule rings D3 ~D10
In the second half of 2017, the Ministry of Environmental Protection issued a draft for comments on the "List of Priority Controlled Chemicals (First Batch)", which intends to include octamethyltetrasiloxane (D4) in the priority control list and classify it as a PBT substance; 2) Deacetate-type room temperature vulcanized silicone rubber generates acetic acid during the vulcanization process, which not only has a pungent smell, but also corrodes metal materials, so it cannot be applied to the bonding and sealing of medical equipment and other medical fields containing metal parts; 3) Ordinary One-component room temperature vulcanized silicone rubber usually uses organotin compounds with certain toxicity and environmental pollution as catalysts
In this patent, ordinary hydroxyl-terminated polydimethylsiloxane contains 2 to 3% small molecule ring volatiles; organic tin catalyst is used, which is poisonous and harmful; methanol which is harmful to human body is released during the vulcanization process

Method used

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  • Medical one-component room temperature vulcanization silicone rubber and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Add toluene to the hydroxyl-terminated polydimethylsiloxane and stir well, let it stand until it is completely separated, separate the solvent layer, and distill off the residual solvent to obtain a low-volatile hydroxyl-terminated polydimethylsiloxane, that is, a low-volatility polydimethylsiloxane 107 Silicone rubber.

[0046] 100 parts of low-volatility 107 silicone rubber with a viscosity of 3000mPa·S and a specific surface area of ​​200m2 treated with silazane 2 Add 20 parts of hydrophobic fumed white carbon black per g to a high-speed mixer, heat up to 160°C and dry for 20 minutes; then move it into a planetary mixer for evacuation and defoaming for 45 minutes, then add 6 parts of ethyl methyl trilactate silane, and dry in a vacuum Mix under the same conditions for 30 minutes; then add 2 parts of γ-aminopropyltriethoxysilane and 0.1 part of tetraisopropyl titanate, and mix in vacuum for 40 minutes; finally, pack and seal under the protection of inert gas to obtain...

Embodiment 2

[0049] Add xylene and ethyl acetate to hydroxyl-terminated polydimethylsiloxane and stir well, let it stand until it is completely separated, separate the solvent layer, and distill off the residual solvent to obtain low-volatility hydroxyl-terminated polydimethylsiloxane Alkane, that is, low volatility 107 silicone rubber.

[0050] 100 parts of low-volatility 107 silicone rubber with a viscosity of 5000mPa·S and a specific surface area of ​​300m2 treated with silazane 2 Add 20 parts of hydrophobic fumed silica / g into a high-speed mixer, heat up to 160°C and dry for 30 minutes; then move it into a planetary mixer to vacuum and defoam for 30 minutes, then add 6 parts of vinyl trilactate silane, and dry under vacuum conditions Mix for 60 minutes; then add 1 part of γ-aminopropyltriethoxysilane, 2 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane and bis(ethyl acetoacetate) dititanate 0.5 part of isopropyl ester, mixed in vacuum for 30 minutes; finally, packaged and sealed und...

Embodiment 3

[0053] Add carbon tetrachloride to the hydroxyl-terminated polydimethylsiloxane and stir well, let it stand until it is completely separated, separate the solvent layer, and distill off the residual solvent to obtain a low-volatility terminal hydroxyl polydimethylsiloxane. Namely low volatility 107 silicone rubber.

[0054] Add 100 parts of low-volatility 107 silicone rubber with a viscosity of 50000mPa·S and 15 parts of hydrophilic fumed silica into a high-speed mixer, heat up to 160°C and dry for 25 minutes; 5 parts of ethyl trilactate silane and 5 parts of vinyl trilactate ethyl silane, mixed under vacuum for 45 minutes; then add 2 parts of γ-chloropropyl trimethoxysilane and 1 part of zinc dibutyl dithiophosphate , mixed in vacuum for 60 minutes; finally, packaged and sealed under the protection of an inert gas to obtain medical one-component room temperature vulcanized silicone rubber.

[0055] The obtained one-component room temperature vulcanized silicone rubber was pr...

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Abstract

The invention discloses a medical one-component room temperature vulcanization silicone rubber and a preparation method thereof, and belongs to the technical field of silicone rubber application, wherein the raw materials of the medical one-component room temperature vulcanization silicone rubber comprises, by mass, 100 parts of low volatile hydroxyl-terminated polydimethylsiloxane, 15-25 parts ofa reinforcing filler, 4-10 parts of a cross-linking agent, 1-3 parts of a tackifier, and 0.1-1 part of a catalyst, and is prepared through heating drying, vacuum defoaming, vacuum mixing and other steps. According to the present invention, the medical one-component room temperature vulcanization silicone rubber can greatly reduce the volatilization amount of D3-D10 small molecules; by using the ethyl lactate-based cross-linking agent, the odor during the silicone rubber vulcanization process is reduced, and no corrosion is generated to the metal material; and by using the novel catalyst, thesafety is further improved compared with the ordinary one-component room temperature vulcanized silicone rubber.

Description

technical field [0001] The invention relates to a one-component room temperature vulcanized silicone rubber, in particular to a medical one-component room temperature vulcanized silicone rubber and a preparation method thereof, belonging to the technical field of silicone rubber applications. Background technique [0002] Organosilicon materials have a wide range of uses due to their good high and low temperature resistance, UV aging resistance, electrical insulation, and chemical stability. In particular, organosilicon materials have excellent biocompatibility, low toxicity, and high gas permeability. Due to its unique characteristics, a variety of silicone materials are widely used in many fields of the medical industry, and one-component room temperature vulcanizing silicone rubber adhesives are one of them. [0003] At present, commercially available one-component room temperature vulcanized silicone rubber is mainly divided into three types: deketoxime type, dealcoholiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J11/04C09J11/06
Inventor 王强刘彬赵泽彬毛云忠陈世容谢志坚暴玉强
Owner CHINA BLUESTAR CHENGRAND CO LTD
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