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Silicon rubber composition and preparing method thereof

A technology of silicone rubber composition and degree of polymerization, applied in the field of silicone rubber composition and its manufacture, can solve the problem of reducing the undocumented and other problems, and achieve the effect of excellent characteristics

Inactive Publication Date: 2011-01-12
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

JP-A-7-179766, JP-A-7-228782, and JP-A-7-258551 (Patent Documents 1 to 3) disclose silicone rubber compositions with high durability and high transparency. Invented the same silanol as a surface treatment agent for silica, but made no mention of reducing low-molecular-weight siloxane contained in silicone rubber in raw material components

Method used

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  • Silicon rubber composition and preparing method thereof
  • Silicon rubber composition and preparing method thereof
  • Silicon rubber composition and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] (preparation of organopolysiloxane with little low molecular weight siloxane)

[0097] The organopolysiloxane was heat-treated at 170° C. for 3 hours with a kneader to prepare an organopolysiloxane with a low-molecular siloxane content of 550 ppm. 0.15 mole % methyl vinyl siloxane unit and 0.025 mole % dimethyl vinyl siloxane unit, the average degree of polymerization is about 6000, the amount of low molecular siloxane (that is, dimethyl siloxane ring The total mass of the 3-mer to cyclic 10-mer and the linear dimethylsiloxane 3-10-mer whose molecular chain ends are terminated by silanol groups, the same below) is 20000 ppm.

[0098] (silicone rubber composition)

[0099] Add 100 parts by mass of the organopolysiloxane prepared above, 4 parts by mass of a disilanol compound represented by the following formula (3), and have a specific surface area of ​​200 m according to the BET method. 2 / g of fumed silica (trade name: Aerosil (registered trademark) 200, manufactu...

Embodiment 2

[0111] Except not using the disilanol compound of the formula (3) used in Example 1, but adding 5 parts by mass of the disilanol compound of the following formula (4), the basic compound (2) was prepared in the same way. Its properties were measured as well as the properties of the test pieces and test pieces obtained by processing the base compound. The results are shown in Table 1.

[0112] [chemical 5]

[0113] Formula (4):

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Abstract

The present invention provides a silicon rubber composition and preparing method thereof. The silicon rubber composition can be prepared without additional heating processing after silicon rubber compounds are prepared so as to obtain silicon rubber extracted with acetone in which the content of low molecular weight siloxane with a polymerization degree of less than 10 is 2000ppm. The silicon rubber composition provides a condensate in which the content of low molecular weight siloxane with a polymerization degree of less than 10 is 2000ppm, comprising (A) formula (1): RnSiO(-n) / 2 as shown, which is organic polysiloxane having at least two alkenyl in one molecule in which the content of low molecular weight siloxane with a polymerization degree of less than 10 is 2000ppm and [R is a monovalent alkyl; n is 1.95-2.04]; (B) silandiol compound of formula (2), (HO)R1SiOSiR12(HO) [R1 is a monovalent alkyl (CH3)3SiO]; (C) reinforced silica with more than 50m2 / g of surface area; (D) condensation catalyst, and (E) curing agent.

Description

technical field [0001] The present invention relates to a silicone rubber composition and a method for producing the silicone rubber composition, which can provide low-molecular-weight silicone with little low-molecular-weight siloxane (the degree of polymerization extracted by acetone is 10 or less) without performing a heating step during the production of the silicone rubber composition. Alkane content of 2000ppm or less), a cured product with excellent compression set properties. Background technique [0002] Silicone rubber is widely used in various fields such as electrical equipment, automobiles, construction, medical care, and food due to its excellent weather resistance, electrical properties, low compression set, heat resistance, and cold resistance. Examples include rubber contacts used as rubber contacts for remote controls, typewriters, word processors, computer terminals, musical instruments, etc.; building seals; rollers for copiers, developing rollers, transf...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K13/02C08K3/36
Inventor 轰大地山崎敏夫五十岚实鹿岛敦人
Owner SHIN ETSU CHEM IND CO LTD
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