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Silicone rubber and product thereof

A silicone rubber and rubber technology, applied in the field of silicone rubber and its products, can solve the problems of products such as easy hardening, achieve the effect of enhancing compression set and solving easy hardening

Active Publication Date: 2021-06-22
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the formulation design of the present invention, adding an appropriate amount of cerium oxide, spinel powder and titanium dioxide at the same time can synergistically enhance the compression set of silicone rubber, and effectively solve the problem that the product is easy to harden

Method used

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  • Silicone rubber and product thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] Preparation of internal release agent: Put ester wax and simethicone in a kneader at a mass ratio of 100:50, add 14 parts by mass of talcum powder, 12 parts by mass of mica powder, and 4 parts by mass of stearin Zinc acid and 10 parts by mass of surfactant (such as polyether modified silicone oil, viscosity is 1800mPa·s, side chain contains 3 (CH 2 ) 3 O(C 2 h 4 O) 12 H), discharge after mixing evenly.

[0020] Preparation of rubber: Add 3 to 6 parts of hydroxyl silicone oil to 100 parts of methyl vinyl silicone rubber raw rubber (the molar fraction of vinyl chains is 0.15%, and the average degree of polymerization is about 7000), and the specific surface area of ​​40 parts is 200m 2 / g of fumed silica, mixed uniformly in a kneader. Then treat it at 170°C for 2 hours to make a compound compound. Add 1-3 parts of internal release agent and 0.3-1.5 parts of vulcanizing agent to every 100 parts of compound rubber, knead evenly, put it into a metal mold, and hot-press...

Embodiment 1-4 and comparative example 1-4

[0023] Preparation of rubber products: Add 1 part of hydroxy silicone oil with a polymerization degree of 10 to 100 parts of methyl vinyl silicone rubber raw rubber (the molar fraction of vinyl chain segments is 0.15%, and the average degree of polymerization is about 7000), and 3 parts of 15 hydroxy silicone oil, 40 parts BET method specific surface area is 200m 2 / g of fumed silica, mixed evenly in a kneader, and made into a compound compound. Then treat it at 170°C for 2 hours, add 2 parts of self-made internal release agent, 1 part of vulcanizing agent, 20 parts of cerium oxide, 30 parts of spinel powder, and 30 parts of titanium dioxide to 100 parts of the mixed rubber material to mix evenly, and then Place the uniformly mixed rubber material in a mold, and heat-press vulcanize it at 170°C for 10 minutes to form a disc-shaped (diameter 25mm x thickness 1.2mm) silicone rubber product.

Embodiment 2

[0025] Preparation of rubber products: Add 1 part of hydroxy silicone oil with a polymerization degree of 10 to 100 parts of methyl vinyl silicone rubber raw rubber (the molar fraction of vinyl chain segments is 0.15%, and the average degree of polymerization is about 7000), and 3 parts of 15 hydroxy silicone oil, 40 parts specific surface area is 200m 2 / g of fumed silica, mixed evenly in a kneader, and made into a compound compound. Then treat it at 170°C for 2 hours, add 2 parts of internal release agent, 1 part of vulcanizing agent, 40 parts of cerium oxide, 50 parts of spinel powder, and 50 parts of titanium dioxide to 100 parts of the mixed rubber material to mix evenly, and then mix The uniformly mixed rubber material is placed in a mold, and hot-pressed and vulcanized at 170°C for 10 minutes to form a disc-shaped (diameter 25mm x thickness 1.2mm) silicone rubber product.

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Abstract

The invention provides silicone rubber which comprises 100 parts of methyl vinyl silicone rubber, 20-60 parts of fumed silica, 20-40 parts of cerium oxide, 30-50 parts of spinel powder, 30-50 parts of titanium dioxide, 2-10 parts of a structure control agent, 1-5 parts of a release agent and 0.2-5 parts of a vulcanizing agent. The silicone rubber which is easy to demould and excellent in sealing performance is obtained through formula design. In the formula design, the cerium oxide, the spinel powder and the titanium dioxide in a proper ratio are added at the same time, so that the compression permanent deformation of the silicone rubber can be synergistically enhanced, and the problem that a product is easy to harden is effectively solved. The silicone rubber disclosed by the invention is particularly suitable for application fields with relatively high requirements on sealing performance, and a product of the silicone rubber can be a sealing ring, or a sealing gasket, or a sealing strip, or a sealant.

Description

【Technical field】 [0001] The invention relates to silicone rubber and its products, in particular to a silicone rubber and its products with good sealing performance and easy demoulding. 【Background technique】 [0002] Silicone rubber is widely used in many fields due to its excellent thermal stability, chemical stability, oxygen resistance and aging resistance, light resistance and aging resistance, mildew resistance and electrical insulation. The compression set of rubber is mainly dominated by the change of rubber recovery ability. Factors affecting the recovery ability include the force between molecules, the change of network structure, and the displacement between molecules. Due to the low tensile strength and poor compression set performance of silicone rubber, its application in the high-end sealing field is limited. In order to overcome these shortcomings, the prior art usually directly adds reinforcing fillers or active silanes (such as aminosilane) to the silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K13/04C08K7/26C08K3/22
CPCC08L83/04C08L2205/025C08L2205/035C08K2201/003C08K2201/006C08K2003/2241C08K2003/2213C08K13/04C08K7/26C08K3/22
Inventor 刘若鹏赵治亚王侃
Owner LUOYANG INST OF CUTTING EDGE TECH
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