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Medical two-component addition-type liquid silicone rubber and preparation method thereof

A liquid silicone rubber, two-component technology, applied in the field of silicone rubber, can solve problems such as poor physical properties and processing performance, and achieve the effect of satisfying processing performance and molding periodicity

Inactive Publication Date: 2016-12-14
JIANGSU TIANCHEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art, the object of the present invention is to provide a two-component addition type liquid silicone rubber for medical use and its preparation method, so as to solve the poor physical properties and processability of existing medical silicone rubber products. question

Method used

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  • Medical two-component addition-type liquid silicone rubber and preparation method thereof
  • Medical two-component addition-type liquid silicone rubber and preparation method thereof

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preparation example Construction

[0036] The preparation method of the above-mentioned high-transparency medical two-component addition type liquid silicone rubber comprises the following steps:

[0037] a. Preparation of component A

[0038] Firstly, add vinyl polysiloxane with formulation amount of 50-80%, silane coupling agent with formulation amount and fumed silica with formulation amount to the kneader, stir at room temperature for 1-6 hours; heat up to 120-180°C, Stir under vacuum conditions for 1-6 hours, then stop the vacuum, continue to add the remaining formula amount of vinyl polysiloxane for dilution, then add the formula amount of platinum catalyst, and stir evenly to obtain component A;

[0039] b. Preparation of component B

[0040] Firstly, add vinyl polysiloxane with formulation amount of 50-80%, silane coupling agent with formulation amount and fumed silica with formulation amount to the kneader, stir at room temperature for 1-6 hours; heat up to 120-180°C, Stir under vacuum conditions for...

Embodiment 1

[0044] (1) Preparation of component A

[0045] ①Mix 100kg of octamethylcyclotetrasiloxane and 1.5kg of tetramethyldivinyldisiloxane, add 0.2kg of catalyst tetramethylammonium hydroxide under stirring, raise the temperature to 120°C for 4 hours, and then Raise the temperature to 200°C, delower the molecule for 6 hours under a vacuum of 0.08-0.09MPa, and obtain vinyl polysiloxane after cooling. The viscosity at 25°C is 11000mPa.s, and the mass percentage of vinyl is 0.42%.

[0046] ② Add 300kg of vinyl polysiloxane, 34kg of silane coupling agent (dimethyldiethoxysilane) and 240kg of fumed silica into a 1000L kneader, stir to form a group and continue to stir at room temperature for 2 hours; heat up to 140 ℃, stirred for 3 hours under the condition of vacuum 0.8MPa, then stopped the vacuum, added 100kg vinylpolysiloxane after cooling down; added 1.28kg tetramethyldivinyldisiloxane complex of chloroplatinic acid, stirred evenly, and obtained component A;

[0047] (2) Preparation...

Embodiment 2

[0055] (1) Preparation of component A

[0056] ①Mix 100kg of octamethylcyclotetrasiloxane and 1.5kg of tetramethyldivinyldisiloxane, add 0.2kg of catalyst tetramethylammonium hydroxide under stirring, raise the temperature to 120°C for 4 hours, and then Raise the temperature to 200°C, delower the molecule for 6 hours under a vacuum of 0.08-0.09MPa, and obtain vinyl polysiloxane after cooling. The viscosity at 25°C is 11000mPa.s, and the mass percentage of vinyl is 0.42%.

[0057] ②Add 290kg of vinyl polysiloxane, 22kg of silane coupling agent (dimethylcyclosiloxane) and 203kg of fumed silica into a 1000L kneader, stir to form a group and continue to stir at room temperature for 2 hours; heat up to 170°C , stirred for 3 hours under the condition of vacuum 0.8MPa, then stopped the vacuum, added 180kg vinyl polysiloxane after cooling down; added 1.35kg chloroplatinic acid tetramethyldivinyldisiloxane complex, stirred evenly, and obtained the Part A;

[0058] (2) Preparation of ...

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Abstract

The invention discloses medical two-component addition-type liquid silicone rubber. The liquid silicone rubber comprises a component A and a component B in a mass ratio of 1: 1, wherein the component A comprises the following raw materials in parts by mass: 50 to 70 parts of vinyl polysiloxane, 3 to 10 parts of a silane coupling agent, 20 to 45 parts of fumed silica and 0.1 to 1 part of a platinum catalyst; the component B comprises the following raw materials in parts by mass: 50 to 70 parts of vinyl polysiloxane, 2 to 5 parts of a silane coupling agent, 20 to 45 parts of fumed silica, 2 to 20 parts of low hydrogen containing polysiloxane, and 0.1 to 0.5 part of an inhibitor. The liquid silicone rubber prepared by the invention has high transparency and high mechanical properties, meets medical requirements of FDA and the like, and further can meet the processing performance and the molding cycle of liquid injection molding silicone rubber.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a two-component addition type liquid silicone rubber for medical use and a preparation method thereof. Background technique [0002] Addition-type liquid injection silicone rubber (LIMS) is a new type of material that is non-toxic, odorless and has excellent physiological inertia. It is mainly manifested as a liquid silicone rubber (LSR) of a two-component addition vulcanization system. Taking advantage of the characteristics of LSR's low viscosity (generally has a certain fluidity before vulcanization) and easy pumping, the two parts are made of special injection molding equipment. The components are accurately mixed automatically, and the uniformly mixed rubber is injected into the mold, and then heated and vulcanized quickly to achieve the purpose of industrial production. In recent years, LIMS has been widely used in electronics, medical, aerospace, food hygiene and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/02C08K3/36C08K5/5419C08G77/20C08G77/08C08G77/38B29C35/02
CPCC08L83/04B29C35/02C08G77/08C08G77/20C08G77/38C08K2201/006C08K2201/014C08L2203/02C08L2205/025C08L2205/03C08K13/02C08K3/36C08K5/5419
Inventor 张旭蔡阳施贤斌
Owner JIANGSU TIANCHEN NEW MATERIALS
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