JPH0563308B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an antifouling roll, and particularly to a rubber roll with excellent antifouling properties used for paper feeding in facsimile machines and the like. (Prior art) Rubber rolls made of various types of rubber are usually used for paper feeding, reading, and transfer in facsimile machines equipped with reading devices using contact type light-receiving elements, and these rolls generally have a hardness of 30 to 60 Hs.゜ (JIS), but it is made of silicone rubber because its hardness has less temperature dependence than general synthetic rubber and has excellent weather resistance and heat resistance. is widely used. However, although rolls made of silicone rubber are relatively non-adhesive, this non-adhesiveness is greatly affected by the rubber composition and molding conditions, and it also has antifouling effects. As the number of paper feeds increases, the number of stains on the originals increases.
The roll surface, especially the outer circumferential surface that comes into contact with the paper, gets dirty with paper dust and the like, which affects the image quality. (Structure of the Invention) ^The present invention relates to an antifouling roll that solves the above-mentioned disadvantages.
(OH) ₃ (R ¹ is a monovalent hydrocarbon group having 10 or more carbon atoms) A non-adhesive antifouling layer consisting of a hard film-forming material component and (b) a flexible silicone resin component. It is characterized by: To explain this, the present inventors have conducted various studies on the modification of rubber rolls used in facsimile machines, etc., and found that at least a portion of the outer peripheral surface of the elastic member of a conventionally known rubber roll has been modified with a certain type of silicone rubber. We discovered that when coated with silicone rubber, a non-adhesive antifouling layer is formed, achieving the desired purpose.We proceeded with research on _this silicone rubber. ) ₃ (R ¹ is a monovalent hydrocarbon group having 10 or more carbon atoms) A silicone-based hard film-forming material, and B) A) General formula (R ² is a methyl group, ethyl group or phenyl group,
l is a vinyl siloxy group represented by 100 to 10,000)
100 parts by weight of organopolysiloxane containing 0.05 to 3.0 mol%, B) General formula R ³ mSiO _4-n2 (R ³ is a methyl group, vinyl group or phenyl group, m is 1 or 2, m = 1 and m = 2 The ratio of 4:1 to
Contains 0.1 to 10 mol% of vinyl groups (1:1)
Resin-like organopolysiloxane 5 to 50 represented by
Parts by weight, C) General formula ( ^R4 is a hydrogen atom, a methyl group, an ethyl group, or a phenyl group, n is 10 to 1000) 5 to 30 parts by weight of an organohydrodiene polysiloxane containing 5 to 100 mol% of a hydrogen siloxy group;
and D) It was confirmed that the desired non-adhesive antifouling layer could be formed by using a flexible silicone resin component consisting of a catalytic amount of platinum or a platinum compound, and this silicone component The present invention was completed by conducting research on the types, blending amounts, processing methods, etc. The antifouling roll of the present invention is a rubber roll having an elastic member wrapped around a rotating shaft, and a silicone-based non-adhesive antifouling layer is provided on at least a part of the outer peripheral surface of the elastic member. This rotating shaft has surface treatments such as electroless nickel plating and nitrocarburizing on the surface of stainless steel, aluminum alloy, or various metal materials. The roll may be treated with anti-corrosion treatment, for example, the rotating shaft of this roll may be EDPM,
It can be made by covering it with an elastic member made of synthetic rubber such as NBR, SBR, chloroprene, or silicone rubber, curing it by heating, and then polishing the surface with a grinder or the like. The non-adhesive antifouling layer provided on this elastic member is said to be made from a silicone-based composition, which is made from the above-mentioned a) hard film-forming material and the above-mentioned b) flexible silicone resin component. It is necessary to make it become what it is. The hard film forming material as component (a) is represented by the general formula R ¹ Si(OH) ₃ , where R is -C ₁₀ H ₂₁ , -C ₁₀ H ₂₀ COOH, -C ₁₀ H ₂₀ OH,
−C ₁₆ H ₃₃ , −C ₁₆ H ₃₂ COOH, −C ₁₇ H ₃₅ , −
It must be a monovalent hydrocarbon group with a carbon number of 10 or more, such as C ₂₀ H ₄₀ OH, etc. The flexible silicone resin as the component (b) must be of various types such as addition reaction type and condensation reaction type. Flexible silicone resins include, for example, A) general formula 0.05 for a vinylsiloxy group whose molecular chain end is capped with a vinyl group, where R ² is a methyl group, ethyl group, or phenyl group, and l is 100 to 10,000.
Organopolysiloxane 100 containing ~3.0 mol%
Parts by weight, B) General formula

[Formula], R ³ is a methyl group, vinyl group or phenyl group, m is 1
Or 2, where m=1 and m=2 are 4:
5 to 50 parts by weight of a resinous organopolysiloxane containing 0.1 to 10 mol% of vinyl groups in a ratio of 1 to 1:1, C) General formula , R ⁴ is a hydrogen atom, a methyl group, an ethyl group, or a phenyl group, and n is 10 to 1000,
Organohydrodiene polysiloxane 5 to 5 containing 5 to 100 mol% of hydrogen siloxy groups
It may be a so-called addition reaction type flexible organosiloxane resin component consisting of 30 parts by weight and D) platinum or a platinum compound containing a catalyst. The silicone component forming this non-adhesive antifouling layer is composed of the above-mentioned components (a) and (b) in a ratio of 1:1 to 1:1.
It is best to mix the mixture at a weight ratio of 1:30 to 1:20, preferably from 1:3 to 1:20. This is because it has been confirmed that a film made from the above-mentioned combination of components (a) and (b) has good non-adhesive properties and excellent stain resistance. Processing of this non-adhesive antifouling layer into an elastic member is carried out, for example, by applying a silicone composition consisting of the above-mentioned components (a) and (b) onto the surface of the elastic member to a thickness of about 5 to 100 μm using a transfer roll or the like. The coated surface can be cured by applying the coating and heating it to 25 to 200°C for 10 to 60 minutes. Although it does not need to be provided on the end face perpendicular to the rotation axis or on the outer peripheral surface parallel to the rotation axis, it is necessary to provide it on at least a part of the outer peripheral surface. This may be done partially, for example on both sides of the outer circumferential surface. Since the silicone cured film thus obtained exhibits a non-adhesive resin-like property, it is useful in that an antifouling roll having the desired purpose can be easily obtained. Since the antifouling roll of the present invention is used for facsimile machines, it is preferable that the surface thereof be white. Therefore, the above-mentioned silicone composition may be added with a white filler such as titanium white. However, in order to prevent the adhesion of paper powder and dust due to static electricity and noise to the light receiving device, it is recommended that either the above-mentioned elastic member or non-adhesive antifouling layer be made conductive. Therefore, these may be made of a conductive material containing carbon black or the like. Next, the antifouling roll of the present invention will be explained based on the attached drawings. FIG. 1 shows a longitudinal cross-sectional view of the antifouling roll of the present invention, and FIG. The one with dirt layer 3 is
In addition, Fig. b shows a structure in which the non-adhesive antifouling layer 3 is provided only on both sides of the outer circumferential surface of the elastic member 2.
Moreover, FIG. 2 shows a longitudinal cross-sectional view of a facsimile machine using the antifouling roll of the present invention, and this shows a document paper 5 running on the antifouling roll 4 of the present invention.
is made to run between the antifouling roll 4 and a reading device 6 having a contact type light receiving element provided on the antifouling roll 4. According to this, the antifouling roll 4 is non-adhesive. Because it is large and stain-resistant, there is no need to wrap the document around the stain-proof roll 4, so there is no need to install a peeling claw that was required in conventional devices of this type, and it also eliminates paper dust. , the adhesion of dust etc. to the antifouling roll 4 is almost eliminated,
Furthermore, background noise can be significantly reduced, and the coloring power of the coloring agent can also be significantly reduced compared to conventional products. Next, examples of the present invention will be given, and parts in the examples indicate parts by weight. Example Silicone rubber compound KE 852U [product name manufactured by Shin-Etsu Chemical Co., Ltd.] was made using a mold press method on a stainless steel shaft with a diameter of 8 mmφ and a length of 300 mm.
A silicone rubber base containing 100 parts and 3 parts of curing catalyst C-8 (product name manufactured by the same company) was coated and cured by heating to make a rubber roll with an outer diameter of 30 mmφ and a length of 200 mm, and the surface was polished. However, the resulting roll showed adhesion to paper. Next, a) a silicone compound represented by the formula C ₁₈ H ₃₇ Si(OH) ₃ as the component.
10 parts to 30 parts of isopropyl alcohol, 70 parts of toluene
A) is prepared by dissolving it in a mixed solvent consisting of Vinyl group-containing methylvinylsiloxane represented by
100 parts, B) 25 parts of a siloxane copolymer resin consisting of 100 parts of (CH ₃ ) ₃ SiO _0.5 units, 0.5 parts of (CH ₂ =CH) (CH ₃ ) ₂ SiO _0.5 units, and 50 parts of SiO ₂ units, C) formula Methylhydrodiene polysiloxane represented by
10 parts, D) Chloroplatinic acid isopropyl alcohol 10
% solution 0.002 part and E) Monotitanium white powder 10
Prepare a 10% toluene solution of components A) and B) at a ratio of 1:5 in a beaker No. 1 to obtain a silicone composition. When applied to the surface to a thickness of 50 μm and heated at 200°C for 1 hour,
A roll having a flexible silicone film on the surface was obtained, and the silicone film formed on the surface was non-adhesive and had antifouling properties. In addition, when the roll with the non-adhesive antifouling layer obtained in this way (antifouling roll) was used for facsimile purposes, it was found that this roll was able to prevent documents from wrapping around the antifouling roll, paper powder, and dust. It showed the effect that there was no adhesion to the dirty roll and there was almost no coloring due to the coloring agent.

[Brief explanation of the drawing]

FIGS. 1a and 1b show a longitudinal cross-sectional view of the antifouling roll of the present invention, and FIG. 2 shows a longitudinal cross-sectional view of a facsimile machine using this antifouling roll. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Elastic member, 3... Non-adhesive antifouling layer, 4... Antifouling roll, 5... Manuscript paper, 6... Reading device.

Claims (1)

[Claims] 1. A hard material represented by the general formula R ¹ Si(OH) ₃ (R ¹ is a monovalent hydrocarbon group having 10 or more carbon atoms) on at least a part of the outer peripheral surface of the elastic member. An antifouling roll comprising a non-adhesive antifouling layer comprising a film-forming material component and b) a flexible silicone resin component. 2 The flexible silicone resin component has A) general formula (R ² is a methyl group, ethyl group or phenyl group,
l is a vinyl siloxy group represented by 100 to 10,000)
100 parts by weight of organopolysiloxane containing 0.05 to 3.0 mol%, B) General formula R ³ mSiO _4-n2 (R ³ is a methyl group, vinyl group or phenyl group, M is 1 or 2, m = 1 and m = 2 The ratio of 4:1 to
Contains 0.1 to 10 mol% of vinyl groups (1:1)
5 to 50 parts by weight of resinous organosiloxane represented by C) General formula ( ^R4 is a hydrogen atom, a methyl group, an ethyl group, or a phenyl group, n is 10 to 1000) 5 to 30 parts by weight of an organohydrodiene polysiloxane containing 5 to 100 mol% of a hydrogen siloxy group;
and D) a catalytic amount of platinum or a platinum compound.