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Liquid silicon rubber composition and preparation method thereof

A technology of liquid silicone rubber and composition, applied in the field of liquid silicone rubber composition and its preparation, can solve the problems of low resilience and low compression permanent deformation of liquid silicone rubber, achieve no influence on physical and mechanical properties, reduce heat The effect of expansion and contraction, ensuring liquidity

Active Publication Date: 2011-03-09
SHENZHEN CITY SQUARE SILICONE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a liquid silicone rubber composition and its preparation method to solve the problems of traditional liquid silicone rubber such as low resilience and low compression set.

Method used

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  • Liquid silicon rubber composition and preparation method thereof
  • Liquid silicon rubber composition and preparation method thereof
  • Liquid silicon rubber composition and preparation method thereof

Examples

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preparation example Construction

[0056] The present invention also provides a kind of preparation method of liquid silicone rubber composition, and this preparation method comprises the steps:

[0057] Step 1: Add 0.1-10 parts (by mass) of heat-resistant agent, 1-10 parts of vinyl-containing polydimethylsiloxane raw rubber (viscosity of 10,000,000mPa·s), 0.01-10 parts of inorganic The reinforcing agent is mixed evenly in the kneader, and then 0.01 to 1 part of surface treatment agent is added for emulsification treatment, and a silicone rubber heat-resistant agent that can reduce compression set is obtained;

[0058] Step 2: 100 parts (mass parts) of polysiloxane whose end group is vinyl, 1-400 parts of inorganic reinforcing agent, 1-20 parts of surface treatment agent and 1-10 parts of deionized water Mixing, heat treatment for 3 hours, cooling to normal temperature to obtain base rubber, adding 0.01 to 50 parts of expansion agent to the base rubber, stirring evenly, and then dividing it into the first and s...

Embodiment 1

[0069] The unexpanded expander (Akzo Expand cell 45DU) was dried in an oven at a temperature of 90° C. for 1 hour (h). After cooling, mix 20 parts of polysiloxane with side group containing 0.2% vinyl group (the end group is vinyl group) and 5 parts of expansion agent, and place it in an oven at 150°C for 1 hour to obtain pre-foaming Uniform expander.

Embodiment 2

[0071] Mix 0.5 parts of iron oxide and 0.5 parts of cerium hydroxide (Rodia Chemical C×105), 2 parts of vinyl-containing polydimethylsiloxane raw rubber (viscosity of 10,000,000mPa·s) and 0.4 parts of fume white Carbon black (Wacker chemical N20) was mixed homogeneously in a kneader. Then add 0.2 parts of hexamethyldisilazane for emulsification treatment, and obtain a silicone rubber heat-resistant agent capable of reducing compression set.

[0072] Example 1

[0073] 100 parts of vinyl-terminated polysiloxane (viscosity 20,000mPa·s) with a specific surface area of ​​200m 2 20 parts / g of fumed silica (Wacker Chemical N20), 6 parts of hexamethyldisilazane, and 3 parts of deionized water were sequentially added to the kneader, heated to 140°C, and heat-treated for 3 hours. Cool to normal temperature to obtain Base Gum I. Then add 5 parts of unexpanded expansion agent (AKZO Expand cell 45DU) into base gum I, and stir evenly in a kneader. Then divide it into two equal parts, A...

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Abstract

The invention relates to a liquid silicon rubber composition which comprises the following components in parts by mass: 100 parts of polydimethylsiloxane with vinyl as an end group, 1-400 parts of inorganic reinforcing agent, 1-20 parts of low-viscosity polydimethylsiloxane with a vinyl-containing side group, 0.01-10 parts of cross-linking agent, 1-30 parts of polydimethylsiloxane with hydroxyl as an end group, and a platinum catalyst capable of curing the liquid silicon rubber composition. The invention further relates to a preparation method of the liquid silicon rubber composition. The liquid silicon rubber composition has low viscosity and good fluidity before being cured and is applicable to injection molding; and the composition has excellent resilience and low compression deformation ratio after being cured. The liquid silicon rubber composition can be applied to an elastomer, a pressure roll and an image heating and fixing device in a copier and a laser printer as well as certain silicon rubber products in need of the properties.

Description

technical field [0001] The invention relates to a silicone rubber and a preparation method thereof, in particular to a liquid silicone rubber composition with high resilience and low compression set that can be made into a sponge and a preparation method thereof. Background technique [0002] Silicone rubber has excellent properties such as high and low temperature resistance, ultraviolet resistance, radiation resistance, weather resistance, electrical insulation, high air permeability, and physiological inertia. , daily necessities, etc. are widely used. [0003] A lot of silicone rubber compositions with compression set that are mainly used for sealing materials have been disclosed, such as containing alkyl titanate (seeing European patent, the patent number is EP 0 581 504A2), cerium hydroxide (seeing European patent, patent No. EP 0 415 180A2), organic nitrogen cations (see European patent, patent No. EP 0 926 190A1), and use an inorganic acid treatment agent to reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08L83/04C08L33/00C08L69/00C08L83/05C08K3/34C08K9/06C08K3/22C08K5/098
CPCC08K3/22C08K5/098C08L83/06C08G77/16C08L33/00C08L83/04C08L69/00C08K9/06C08G77/20C08K5/54C08K3/34C08K5/56C08L83/00
Inventor 李彦民
Owner SHENZHEN CITY SQUARE SILICONE MATERIALS
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