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Silicon rubber sponge, its manufacture and image forming roller thereof

By using high-temperature non-acyl organic peroxides and sodium bicarbonate foaming agents, a silicone rubber sponge with a high foaming rate is prepared, which solves the problem of low foaming rate of silicone rubber sponges and improves the mechanical strength and durability of the sponge. Thermal properties reduce rolling instability and the influence of heating temperature.

Inactive Publication Date: 2010-11-10
SHIN ETSU CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In Patent Document 1, a foaming system using 1,6-bis(tert-butylperoxycarboxy)hexane (peroxyester class, 163°C) and AIBN (azobisisobutyronitrile) as a foaming agent, but this patent is a technology to obtain a good sponge by using an organic peroxide with excellent surface curability. The organic peroxide It is an organic peroxide with excellent surface curability that can be vulcanized by hot air at normal pressure, and the pores of the sponge are independent. Foaming, in addition, especially, it is not a technology to increase the continuous foaming rate of the sponge, and there is no record of the continuous foaming rate
[0012] In Patent Document 2, although a silicone rubber sponge composition foamed with crystal water of inorganic salts having crystal water is described, there is no description of a continuous-foam sponge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 100 parts of organopolysiloxane containing 99.825 mol% of dimethylsiloxane units, 0.15 mol% of methylvinylsiloxane units, and 0.025 mol% of dimethylvinylsiloxane units, with an average degree of polymerization of 8000 Alkanes, 40 parts BET surface area 200m 2 / g of dry silica Arosil200 (manufactured by Nippon Aerosil Co., Ltd.), 5 parts having silanol groups at both ends and a viscosity of 29 mm 2 / s (23°C) dimethylpolysiloxane is mixed with a kneader, and then heat-treated at 180°C for 2 hours to make a basic rubber mixture.

[0075] With respect to 100 parts of the obtained basic rubber mixture, 4.0 parts of sodium bicarbonate (purity of 99% or more of reagent grade, particle size of 40 μm) and 0.6 parts of 2,5-dimethyl-2, 5-Di(tert-butylperoxy)hexane was added and mixed by a 2-roll mill to form a 9 mm thick sheet of the rubber mixture. Next, this 9 mm thick sheet was vulcanized with hot air at normal pressure for 30 minutes in a hot air drier at 230° C. to obtain a...

Embodiment 2

[0083] A sponge was formed in the same manner as in Example 1, except that 1.0 part of organic blowing agent 1,1'-azobis(cyclohexane-1-methylcarboxylate) was added as a pore refinement and nucleating agent.

Embodiment 3

[0085] A sponge was formed in the same manner as in Example 2 except that 1,1'-azobis(cyclohexyl-1-methylcarboxylate) as an organic blowing agent was changed to 2.0 parts.

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Abstract

To provide a silicone sponge having a high continuous cell rate, capable of being produced by a normal temperature hot air vulcanization without considering the regulation of the cross-linking speed of the rubber and a delicate balance of a foaming gas rate, excellent in productivity, capable of forming a uniform and fine cell structure and having less toxicity. This silicone rubber sponge composition having the high continuous cell rate contains (A) 100 pts. mass organopolysiloxane expressed by the following averaged compositional formula (I): R<SP>1< / SP><SB>a< / SB>SiO<SB>4-(a / 2)< / SB>[wherein, R<SP>1< / SP>s are each the same or different kind un-substituted or substituted monovalent hydrocarbon group; and (a) is 1.95-2.04 positive number] , (B) 0.5-50 pt. mass blowing agent generating gas at >=90[deg.]C temperature zone and (C) an effective amount for curing the component (A) of a non-acyl-based organic peroxide having >=150[deg.]C half-life temperature at 1 min.

Description

[0001] This application is a divisional application of an invention application with a filing date of September 08, 2005, an application number of 200510098145.0, and an invention title of "high intercellular foam rate silicone rubber sponge, its manufacturing method and its fixing roller". technical field [0002] The present invention relates to sponge rollers for office machines mainly used in image forming devices such as building gaskets, various sponge sheets, water-absorbing sponges, heat insulation sheets, industrial rollers, copiers, facsimile machines, printers, etc. Silicone rubber sponge with a high continuous foam rate for solvent-fused fixing rollers, paper feed rollers, toner conveying rollers, and cleaning rollers. Background technique [0003] Polysiloxane sponge has the unique physical properties of silicone rubber, and has excellent properties such as heat resistance, cold resistance, electrical insulation, flame retardancy, and compression set. This silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K5/14C08J9/08C08J9/10G03G15/20
Owner SHIN ETSU CHEMICAL CO LTD