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Method for preparing semiconductive silicone rubber components for electrophotographic apparatus, and roll and belt for electrophotographic apparatus having the silicone rubber components

A technology of electrostatic printing and silicone rubber, which is applied in the direction of electric recording process applying charge pattern, equipment of electric recording process applying charge pattern, electric recording technique, etc. Thermal degradation, contamination reduction, thickness reduction effects

Inactive Publication Date: 2008-10-01
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the problems of staining and image defects in xerographic printing devices due to low-molecular-weight siloxane bleed out of the silicone rubber member and migrate onto the OPC drum or toner are still not sufficiently resolved, and further improvements are still required.

Method used

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  • Method for preparing semiconductive silicone rubber components for electrophotographic apparatus, and roll and belt for electrophotographic apparatus having the silicone rubber components
  • Method for preparing semiconductive silicone rubber components for electrophotographic apparatus, and roll and belt for electrophotographic apparatus having the silicone rubber components

Examples

Experimental program
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preparation example Construction

[0063] [Manufacturing method of silicone rubber member]

[0064] - once crosslinked

[0065] In the preparation method of the present invention, the silicone rubber composition prepared in the above manner is first molded on a substrate with or without an interlayer therebetween, and then the composition is cured to form a molded cured product.

[0066] There are no specific limitations on molding and curing methods, and conventional methods can be employed. Foam curing method can also be used. There are no specific limitations on the heating and curing methods, and any conventional method may be used provided that sufficient heat is provided to crosslink the silicone component in the composition. There is also no specific limitation on the molding method, and possible methods include continuous vulcanization by extrusion molding, and mold molding by compression molding or injection molding. The molding of this primary crosslinking process is carried out at a heating temper...

Embodiment 1

[0078] Mix the following ingredients together in a kneader:

[0079] - 100 parts organopolysiloxane, viscosity 1 x 10 7 mm 2 / s, containing 99.825mol% dimethylsiloxane units and 0.15mol% methylvinylsiloxane units, both molecular chain ends are terminated by 0.025mol% dimethylvinylsilyl groups,

[0080] -10 parts fumed silica, specific surface area 200m 2 / g (manufactured by Nippon Aerosil Co., Ltd.), and

[0081] - 2 parts of dimethylpolysiloxane polymer, both end-capped with silanol groups, degree of polymerization 3-10, used as dispersant,

[0082] The mixture was then heat treated at 160°C for 2 hours to obtain Base Compound A.

[0083] Then 12 parts of acetylene black called DenkaBlack (average particle size: 40 nm, trade name, manufactured by Denki Kagaku Kogyo Co., Ltd.) which functions as a conductivity-imparting agent was added and dispersed to 100 parts of the base formulation using a two-roll mill. In compound A, a conductive rubber compound A was obtained.

[...

Embodiment 2

[0099] Prepare sheet and roll in the same manner as in Example 1, but change the conditions of secondary crosslinking, and reduce the pressure of secondary crosslinking from 1.0×10 3 Pa(7.5 Torr) becomes 1.0×10 4 Pa (76 torr).

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PUM

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Abstract

The invention relates to a preparation method of an electrostatic printing device semiconductor silicone rubber component, and electrostatic printing device revolve and belt which comprise the silicone rubber component. The method can prepare the electrostatic printing device silicone rubber component in which low molecular weight siloxane component number is greatly reduced. The method comprises following steps: forming molded bituminized product via molding and bituminizing a silicone rubber compound which comprises following components: (A) 100 phr organic based polysiloxane expressed by following average composition general formula (1): (wherein, R represents substituted or non-substituted monovalent hydrocarbon radical, and n represents the number in the range of 1.95 to 2.05), and (B) conductivity endowing agent with enough amount for endowing semi-conduction, and (C) curing agent with enough amount for solidifying the component (A); and processing the molded bituminized product in the pressure not more than 5.0*10<4>Pa and in the temperature of 80 Deg C to 180 Deg C.

Description

technical field [0001] The present invention relates to a method for producing a semiconductor silicone rubber member for an electrophotographic device, a silicone rubber member produced by the method, and a roller and a belt for an electrophotographic device including the silicone rubber member. Background technique [0002] Silicone rubber is used for various rollers (such as developing rollers, toner ) Conveying sponge roller, cleaning sponge roller and fixing roller) or structural materials of various belts (such as developing belt and fixing belt). [0003] Silicone rubber components tend to contain a small amount of uncrosslinked low-molecular-weight siloxane components present in organopolysiloxanes used as raw materials for silicone rubber. If these low-molecular-weight siloxane components migrate from the silicone rubber member to the OPC drum or toner, defects such as white streaks or fogging of printed images are caused. An example of a well-known method of inhi...

Claims

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Application Information

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IPC IPC(8): G03G15/00G03G15/16G03G15/08G03G15/20C08L83/04C08J5/00
CPCG03G5/0578G03G15/0818G03G15/2057G03G2215/2051
Inventor 平林佐太央中村勉
Owner SHIN ETSU CHEM IND CO LTD