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Addition type liquid silicone rubber and preparation method thereof

A technology of liquid silicone rubber and addition type, which is applied in the field of preparation of addition type liquid silicone rubber, can solve the problems of high mechanical properties and low viscosity, and achieve the effect of improving mechanical properties.

Active Publication Date: 2019-11-22
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the high mechanical properties and low viscosity of addition-type liquid silicone rubber materials are difficult to balance, vinyl silicone oil with low viscosity is used as the base polymer, and chain extenders and hydrogen-containing silicone resins are added to improve the stretchability and stability of liquid silicone rubber. Tear strength, to prepare liquid silicone rubber products with moderate base viscosity and mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 600g of vinyl-terminated silicone oil with a viscosity of 20000mpa.s and 80g of hexamethyldisilazane into a kneader and knead evenly, add 20g of water, and knead evenly; 2 Add 400g of fumed silica / g into the kneader in batches; after adding the silica, knead at room temperature for 1h, knead at 120°C for 2h, then heat up to 160°C and knead in vacuum for 2.5h; add 400g20000mpa.s vinyl silicone oil to dilute , finally lowered to room temperature, and discharged to obtain the base rubber 1 with a viscosity of 2842pa.s.

Embodiment 2

[0025] Add 600g of vinyl silicone oil with a viscosity of 20000mpa.s and 60g of hexamethyldisilazane into the kneader and knead evenly, add 15g of water, knead evenly; 2 Add 300g of fumed silica / g into the kneader in batches; after adding the silica, knead at room temperature for 1.5h, knead at 110°C for 2.5h, then heat up to 170°C and knead in vacuum for 2.5h; add 400g of 20000mpa.s ethylene Base silicone oil was diluted, finally cooled to room temperature, and discharged to obtain base rubber 3 with a viscosity of 708pa.s.

Embodiment 3

[0027] Add 600g of vinyl silicone oil with a viscosity of 10000mpa.s, 50g of hexamethyldisilazane and 10g of tetramethyldivinyldisilazane into a kneader and knead evenly, add 15g of water, and knead evenly; 2 Add 300g of fumed silica / g into the kneader in batches; after adding the silica, knead at room temperature for 2h, at 130°C for 2h, then heat up to 170°C and knead in vacuum for 3h; add 400g of 10000mpa.s vinyl silicone oil to dilute , and finally lowered to room temperature, and discharged to obtain Base Gum 3 with a viscosity of 408pa.s.

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Abstract

The invention discloses addition type liquid silicone rubber and a preparation method thereof. The double-component addition type liquid silicone rubber provided by the invention is formed by mixing and curing a component A and a component B, the component A comprises 100 parts of base rubber, 3-15 parts of vinyl-terminated side chain vinyl silicone oil, 3-20 parts of vinyl-terminated silicone oiland 1-1.5 parts of a platinum catalyst, and the component B comprises 100 parts of base rubber, 3-20 parts of a chain extender, 3-8 parts of vinyl-terminated silicone oil, 0.1-0.2 part of an inhibitor and 1-15 parts of hydrogen-containing silicone resin, wherein the base rubber is prepared from the following raw materials in parts by weight of 100 parts of vinyl-terminated silicone oil, 20 to 40parts of fumed silica and 3 to 9 parts of silazane treating agent. The hydrogen-containing silicone resin is used to replace the hydrogen-containing silicone oil as a cross-linking agent, thereby enhancing the mechanical properties of the liquid adhesive.

Description

technical field [0001] The invention relates to a preparation method of addition-type liquid silicone rubber, and more particularly relates to a preparation method of addition-type liquid silicone rubber for injection molding. Background technique [0002] Addition liquid silicone rubber is an important type of silicone rubber, which is mainly composed of vinyl silicone oil, crosslinking agent (hydrogen silicone oil), catalyst, filler, inhibitor, etc., usually divided into two components, storage conditions The cross-linking reaction is suppressed by the inhibitor, and the inhibitor is volatilized by high temperature during use. Vinyl silicone oil (polysiloxane containing vinyl) and cross-linking agent hydrogen-containing silicone oil (polysiloxane containing silicon hydrogen bond) Under the action of platinum-based catalysts, an elastomer with a three-dimensional network structure is formed through a hydrosilylation reaction. Simple silicone rubber elastomers have poor mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K3/36C08K5/5445C08K5/05
CPCC08L83/04C08L2205/035C08L2205/025C08L2312/00C08K3/36C08K5/544C08K5/05
Inventor 杜斌李书兵陈海平肖靖蔡苗
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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