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Preparation method of liquid silicone rubber composition

A technology of liquid silicone rubber and composition, applied in the field of preparation of liquid silicone rubber composition, can solve the problems of affecting printing effect, low molecular exudation, contamination of photosensitive drum, etc.

Active Publication Date: 2015-02-25
SHENZHEN CITY SQUARE SILICONE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are two problems in the developing roller made of semi-conductive silicone rubber elastomer, one is the dispersion uniformity of conductive carbon black or metal powder in silicone rubber, and the other is excessive low-molecular exudation in silicone rubber elastomer. , Contamination of the photosensitive drum (OPC) will eventually affect the printing effect

Method used

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  • Preparation method of liquid silicone rubber composition

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preparation example Construction

[0013] The embodiment of the present invention provides a preparation method of a liquid silicone rubber composition, which comprises the following steps:

[0014] S01: 100-120 parts by mass of polydimethylsiloxane, 50-100 parts by mass of silicon micropowder, 1-50 parts by mass of magnesium carbonate, 1-20 parts by mass of silane-modified conductive carbon black, 1- 10 parts by mass of fumed silica and 1-20 parts by mass of a treating agent are mixed to obtain a mixture, and the mixture is heat-treated at 100-150° C. for 0.5-5 hours, and then heated to 120-160° C. under vacuum. -0.04~-0.1MPa under vacuum for 2~6 hours, cooled to room temperature and ground for 2~4 times to obtain base glue;

[0015] S02: take 100 parts by mass of the base gum, add 1-50 parts by mass of polydimethylsiloxane to dilute, then add 0.02-4 parts by mass of platinum catalyst, and mix at room temperature to obtain material A;

[0016] S03: Take 100 parts by mass of the gum base, add 1-50 parts by mas...

Embodiment 1

[0065] Refining of base rubber:

[0066] Add 60 parts of silicon micropowder and 10 parts of carbonic acid to 50 parts of vinyl polydimethylsiloxane with a vinyl mass fraction of 0.1%, 48 parts of a vinyl mass fraction of 0.2%, and 2 parts of a vinyl mass fraction of 2% Magnesium, 10 parts of surface-treated conductive carbon black, 5 parts of fumed silica, 5 parts of hexamethyldisilazane, heat-treated at 150°C for 3 hours, then heat-treated at 150°C-0.06MPa for 3 hours under reduced pressure, ground after cooling three times.

[0067] Preparation of A and B silica gel:

[0068] Preparation of glue A

[0069] Take the above-mentioned 100 parts by mass of the base glue, add 10 parts by mass of a catalyst with a vinyl content of 0.2% vinyl polydimethylsiloxane to dilute, and 0.6 parts by mass of a catalyst with a platinum metal content of 60 ppm, and mix them uniformly to prepare A material .

[0070] Preparation of B silica gel

[0071] Take the above-mentioned 100 parts b...

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Abstract

The invention relates to a preparation method of a liquid silicone rubber composition. The preparation method includes mixing polydimethylsiloxane, silica powder, magnesium carbonate, silane modificated conductive carbon black, fumed silica and treating agent to obtain a mixture, subjecting the mixture to heat treatment at 100-150 degrees for 0.5-5h, heating the mixture to 120-160 DEG C, evacuating the mixture under vacuum of -0.04--0.1MPa for 2-6hs, and grinding the mixture 2-4 times to obtain base gum after cooling the same to the indoor temperature; adding and mixing polydimethylsiloxane attenuation and platinum catalyst in the base gum at the normal temperature to obtain material A; adding and mixing polydimethylsiloxane attenuation, cross-linking agent and negative catalyst in the base gum at the normal temperature to obtain material B; mixing the material A and the material B, by weight, in the proportion of 1:1, subjecting the mixture to solidification at 100-200 DEG C for 0.1-50h to obtain the liquid silicone rubber composition. The preparation method is simple, and the liquid silicone rubber contains ultra-low low-molecular-weight content and is high in compression permanent deformation rate.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and particularly relates to a preparation method of a liquid silicone rubber composition. Background technique [0002] The developing roller of the laser printer copier is used in the electrophotographic image forming equipment. It is responsible for adhering the developer while transferring the adhering developer to the photosensitive drum, so that the electrostatic latent image on the photosensitive drum can be seen. In this process, the developing roller is required to be in contact with the photosensitive drum, and this pressure developing method has special requirements on the elasticity, surface hardness, roughness and charging characteristics of the developing roller. [0003] At present, most of the semiconductor rubber materials used in the production of developing rollers on the market are made of polyurethane, acrylonitrile-butadiene rubber (NBR), ethylene-propylene-diene ru...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L83/07C08K13/06C08K9/06C08K3/04C08K3/36C08K3/26
CPCC08K3/04C08K3/26C08K3/36C08K9/06C08K13/06C08L83/04
Inventor 李彦民叶宁
Owner SHENZHEN CITY SQUARE SILICONE MATERIALS
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