JP4178759B2 - Roller for OA equipment - Google Patents

Description

【００６１】
【表２】

【００６２】
【表３】

【００６３】
上記表１〜表３の結果から、実施例品はいずれも、ベースゴム層２と塗膜層３との層間接着力に優れており、かつ塗膜層３の表面硬度も良好であることがわかる。これに対して、比較例品は、層間接着力あるいは表面硬度のいずれかの評価に劣るものであることがわかる。
【００６４】
【発明の効果】
以上のように、本発明のＯＡ機器用ローラは、シリコーンゴムを主成分とするベースゴム層の活性化処理面に、特定のゴム材料（Ａ）および特定のシランカップリング剤（Ｂ）を含有するゴム組成物からなる塗膜層が形成され構成されている。すなわち、本発明では、上記特定のシランカップリング剤（Ｂ）の化学的作用によって、ベースゴム層の活性化処理面と塗膜層とが強固に合一体化するため、上記ベースゴム層の活性化処理面に対して接着剤を塗布しなくても、塗膜層の剥がれや破れ等の発生を防止できる。また、上記接着剤の塗布工程が不要となるため、工程の省略化を実現することができる。
【００６５】
特に、上記（Ｂ）のシランカップリング剤が、γ−メルカプトプロピルトリメトキシシラン，γ−（メタクリロキシプロピル）トリメトキシシラン，ビニルトリス（βメトキシエトキシ）シラン，γ−グリシジルオキシプロピルトリメトキシシラン，Ｎ−β（アミノエチル）γ−アミノプロピルトリメトキシシラン，γ−アミノプロピルトリエトキシシラン，Ｎ−フェニル−γ−アミノプロピルトリメトキシシラン，ビスプロピルトリエトキシシランテトラスルフィド，イソシアン酸プロピルトリエトキシシランからなる群から選ばれた少なくとも一種である場合、塗膜層がより強固にベースゴム層に結合するようになるため、ＯＡ機器用ローラとして特に好適なものとなる。
【００６６】
また、上記（Ａ）のゴム材料としてＮＢＲを用いた場合、水素添加アクリロニトリル−ブタジエン系ゴムを用いたときよりも低硬度の塗膜層を得ることができるため、ＯＡ機器用ローラとして特に好適なものとなる。
【００６７】
本発明のＯＡ機器用ローラは、例えば現像ローラとして電子写真複写機に組み込み使用すると、画質の低下が防止され、高画質の複写画像が得られる。
【図面の簡単な説明】
【図１】本発明のＯＡ機器用ローラの一例を示す断面図である。
【図２】本発明のＯＡ機器用ローラの製法を示す説明図である。
【図３】（ａ）はローラの側面図であり、（ｂ）はローラの塗膜層の層間接着力の測定方法を説明するための模式図である。
【符号の説明】
１ 軸体
２ ベースゴム層
３ 塗膜層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roller for office automation equipment, such as a developing roller, a charging roller, a transfer roller, a paper feeding roller, a static elimination roller, and a fixing roller, used in office automation equipment such as a copying machine, a printer, and a facsimile machine.
[0002]
[Prior art]
As a roller for office automation equipment such as a developing roller, for example, a base rubber layer is formed of silicone rubber on the outer periphery of a shaft body, and a hydrogenated acrylonitrile-butadiene is provided on the outer peripheral surface of the base rubber layer via an adhesive layer. A roller having a coating layer formed of a rubber material (coating liquid) such as rubber (hereinafter abbreviated as “H-NBR”) or acrylonitrile-butadiene rubber (hereinafter abbreviated as “NBR”) has been put into practical use. The roller is subjected to treatment such as corona discharge on the outer peripheral surface of the base rubber layer so that the coating layer does not easily peel from the base rubber layer.
[0003]
[Problems to be solved by the invention]
However, when the coating liquid is applied on the base rubber layer to which the adhesive is applied to form a coating film layer, the adhesive may be mixed in the coating liquid. There arises a problem that the performance of the coating layer made of the coating liquid is deteriorated. Further, since the adhesive is easily deactivated, there is a problem that the quality of the obtained roller tends to vary. Furthermore, there is a problem that the production cost increases due to an increase in the number of steps of applying the adhesive.
[0004]
On the other hand, when a coating film layer is formed using H-NBR, the hardness of the coating film layer increases, so that there is a problem that wrinkles and scratches are easily formed on the surface of the obtained roller.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a roller for OA equipment that can sufficiently prevent peeling of a coating layer without using an adhesive.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the roller for office automation equipment according to the present invention has a base rubber layer formed mainly of silicone rubber and activated on the outer periphery of the shaft body. A roller for OA equipment in which a coating layer is formed on the outer peripheral surface of the rubber layer, wherein the coating layer is formed of a rubber composition containing the following (A) and (B): Take.
(A) Acrylonitrile-butadiene rubber (NBR), acrylic rubber (ACM), butadiene rubber (BR), isoprene rubber (IR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), hydrin rubber (ECO, CO) and At least one selected from the group consisting of urethane rubber .
(B) A silane coupling agent represented by any one of the following general formulas (1) and (2).
[Chemical 3]
Y ¹ -C ₃ H ₆ Si (OC _n H _{2n + 1} ) ₃ (1)
[Wherein Y ¹ represents a vinyl group, a glycidoxy group, a mercapto group, an amino group, an epoxy group, an isocyanate group, a methacryl group, or other substituents including these functional groups. N is 1 or 2. ]
[Formula 4]
Y ² —Si (OC ₂ H ₄ OCH ₃ ) ₃ (2)
[Wherein Y ² is a vinyl group. ]
[0007]
That is, the present inventors have repeated a series of studies focusing on the coating layer forming material in order to solve the above problems. As a result, even when a rubber material other than hydrogenated acrylonitrile-butadiene rubber (however, excluding fluoro rubber) is used as the coating layer forming material, the specific silane cup is used as the coating layer forming material. By blending the ring agent (B), the silane coupling agent (B) acts chemically on the activated surface of the base rubber layer mainly composed of silicone rubber to strengthen the coating layer. In order to fix, when forming a coating-film layer, it discovered that application | coating of the conventional adhesive agent became unnecessary, and reached | attained this invention.
[0008]
Here, in the present invention, the “activation process” refers to a process for causing a chemical change or the like on the outer peripheral surface of the base rubber layer by corona discharge, plasma discharge, or the like.
[0009]
In particular, the silane coupling agent (B) is γ-mercaptopropyltrimethoxysilane, γ- (methacryloxypropyl) trimethoxysilane, vinyltris (βmethoxyethoxy) silane, γ-glycidyloxypropyltrimethoxysilane, N -Β (aminoethyl) γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, bispropyltriethoxysilane tetrasulfide, propyltriethoxysilane isocyanate When at least one selected from the group, the coating layer is more strongly bonded to the base rubber layer.
[0010]
Further, when acrylonitrile-butadiene rubber (NBR) is used as the rubber material (A), a coating layer having a lower hardness can be obtained than when hydrogenated acrylonitrile-butadiene rubber is used.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail.
[0012]
For example, as shown in FIG. 1, the roller for OA equipment of the present invention is formed on a shaft body 1, a base rubber layer 2 formed on the outer peripheral surface of the shaft body 1, and an outer peripheral surface of the base rubber layer 2. The coating film layer 3 is provided. Then, the activation treatment as described above is performed on the outer peripheral surface of the base rubber layer 2.
[0013]
The shaft body 1 is not particularly limited. For example, a metal cored bar or a metal hollow cylindrical body is used. Examples of the metal material include aluminum and stainless steel.
[0014]
The silicone rubber that is the main component of the base rubber layer 2 formed on the outer peripheral surface of the shaft body 1 is not particularly limited, but dimethyl silicone polymer added with a vinyl group as a crosslinking site It is preferable to use a silicone oil added.
[0015]
In the present invention, the main component of silicone rubber is to include the case where the base rubber layer 2 is made of only silicone rubber.
[0016]
Further, the base rubber layer 2 can be blended with a conductive agent such as carbon black in addition to the silicone rubber.
[0017]
The coating layer 3 formed on the outer peripheral surface of the base rubber layer 2 is formed of a rubber composition containing a rubber material (A) and a specific silane coupling agent (B).
[0018]
As the rubber material (A), materials other than hydrogenated acrylonitrile-butadiene rubber and fluorine rubber are used, and specifically , acrylonitrile-butadiene rubber (NBR), acrylic rubber (ACM), butadiene rubber (BR). , isoprene rubber (IR), styrene - butadiene rubber (SBR), a chloroprene rubber (CR), a hydrin rubber (ECO, CO), urethane rubber is used. Among these, NBR is preferably used from the viewpoint of low hardness.
[0019]
Examples of the specific silane coupling agent (B) include those represented by any one of the following general formulas (1) and (2).
[0020]
[Chemical formula 5]
Y ¹ -C ₃ H ₆ Si (OC _n H _{2n + 1} ) ₃ (1)
[Wherein Y ¹ represents a vinyl group, a glycidoxy group, a mercapto group, an amino group, an epoxy group, an isocyanate group, a methacryl group, or other substituents including these functional groups. N is 1 or 2. ]
[0021]
[Chemical 6]
Y ² —Si (OC ₂ H ₄ OCH ₃ ) ₃ (2)
[Wherein Y ² is a vinyl group. ]
[0022]
The silane coupling agent represented by the general formula (1) is preferably γ-mercaptopropyltrimethoxysilane, γ- (methacryloxypropyl) trimethoxysilane, γ-glycidyloxypropyltrimethoxysilane, N— β (aminoethyl) γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, bispropyltriethoxysilane tetrasulfide, and propyltriethoxysilane isocyanate. . The silane coupling agent represented by the general formula (2) is preferably vinyltris (βmethoxyethoxy) silane. In addition, these silane coupling agents are used individually or in combination of 2 or more types. Of these, γ-mercaptopropyltrimethoxysilane is more preferably used because it does not affect the conductivity.
[0023]
The mixing ratio of the specific silane coupling agent (B) is not particularly limited, but is 0.01 to 15 parts with respect to 100 parts by weight (hereinafter abbreviated as “part”) of the rubber material (A). It is preferable to set the range. More preferably, it is the range of 0.1-5 parts. That is, when the content of the specific silane coupling agent (B) is less than 0.01 part, the effect of the specific silane coupling agent (B) is not sufficiently exhibited and a tendency to cause delamination is observed. On the contrary, if it exceeds 15 parts, the hardness of the formed coating film layer 3 tends to be too high.
[0024]
In addition to the above (A) and (B), a conductive agent, a foaming agent, a cross-linking agent, a cross-linking accelerator, oil, and the like may be appropriately blended with the rubber composition as the material for forming the coating layer 3. There is no problem.
[0025]
Moreover, the said coating-film layer 3 formation material is used as a coating liquid by melt | dissolving in an organic solvent. Examples of the organic solvent include methyl ethyl ketone (MEK), methanol, toluene, isopropyl alcohol, methyl cellosolve, dimethylformamide and the like. These may be used alone or in combination of two or more. In particular, it is preferable to use methyl ethyl ketone as the organic solvent in terms of solubility in the coating layer 3 forming material. And it is preferable at points, such as coating property, that the coating liquid obtained in this way shall be 0.005-6Pa.s of viscosity.
[0026]
The roller for OA equipment of the present invention can be manufactured as follows, for example.
[0027]
That is, first, the base rubber layer 2 forming material is kneaded with a kneader such as a kneader to prepare the base rubber layer 2 forming material, and the lower lid 15 is set as shown in FIG. The metal shaft body (core metal) 1 is cast into the gap between the cylindrical mold 16. Next, the upper lid 17 is fitted on the cylindrical mold 16 and the entire roller mold is heated to vulcanize the material for forming the base rubber layer 2 (150 to 220 ° C. × 20 minutes). The rubber layer 2 is formed. The outer peripheral surface of the base rubber layer 2 formed in this way is activated by performing corona discharge treatment.
[0028]
On the other hand, a rubber material (A), a silane coupling agent (B) and, if necessary, a mixture of components such as a conductive agent are kneaded together with an organic solvent with a kneader such as a kneader to form a coating layer 3 forming material ( A coating solution is prepared.
[0029]
Next, the coating liquid is applied to the outer peripheral surface of the base rubber layer 2 that has been subjected to the corona discharge treatment. This coating method is not particularly limited, and conventional methods such as a dipping method, a spray method, and a roller coating method can be applied. And the coating-film layer 3 is formed in the outer peripheral surface of the base rubber layer 2 by performing drying and heat processing after coating. In this manner, a roller for OA equipment having a two-layer structure as shown in FIG. 1 can be obtained. In the OA equipment roller thus obtained, the thickness of the base rubber layer 2 is usually preferably set in the range of 0.5 to 10 mm, particularly preferably 1 to 5 mm. Moreover, it is preferable to set the thickness of the said coating-film layer 3 in the range of 1-100 micrometers, Especially preferably, it is 3-30 micrometers.
[0030]
In addition, the said activation process is not limited to a corona discharge process, For example, it can also be performed by a plasma discharge process etc.
[0031]
The roller for OA equipment of the present invention is not limited to the two-layer structure, and for example, a surface layer may be further formed on the outer peripheral surface of the coating film layer 3.
[0032]
The roller for OA equipment of the present invention can be applied to, for example, a developing roller, a charging roller, a transfer roller, a paper feeding roller, a static elimination roller, a fixing roller, and the like.
Next, examples will be described together with comparative examples.
[0034]
[Example 1]
[Preparation of base rubber layer forming material]
100 parts of X-34-424 A / B (silicone rubber, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of X-34-387 A / B (silicone rubber, manufactured by Shin-Etsu Chemical Co., Ltd.) are mixed and dispersed to obtain a base. A rubber layer forming material was prepared.
[0035]
[Preparation of coating layer forming material]
100 parts of NBR (Nipol DN401, manufactured by Nippon Zeon), 1 part of γ-mercaptopropyltrimethoxysilane (A-189, manufactured by Nihon Unicar), 0.5 part of stearic acid (Lunac S30, manufactured by Kao Corporation) , 5 parts of zinc white (ZnO), 30 parts of acetylene black, 1.07 parts of Sunseller CZ-G (manufactured by Sanshin Chemical Co., Ltd.), 0.49 parts of Noxeller BZ-P (manufactured by Ouchi Shinsei Chemical Co., Ltd.) Then, 1 part of powdered sulfur was mixed and dispersed to prepare a rubber composition as a coating layer forming material.
[0036]
[Production of roll]
Next, a core made of SUS303 (diameter 10 mm) is prepared as the shaft body 1, and an outer peripheral surface coated with an adhesive is set inside the roller mold, and the shaft body and the inner surface of the roller mold are placed between them. A compound, which is the base rubber layer 2 forming material, is cast into the gap (see FIG. 2), heat vulcanized (180 ° C. × 1 hour), demolded, and further subjected to secondary vulcanization treatment (200 The base rubber layer 2 (thickness 5 mm) was formed on the outer periphery of the shaft body 1 by performing (C.times.4 hours). The shaft body 1 with the base rubber layer 2 thus obtained is removed from the mold, and a corona discharge is generated on the outer peripheral surface of the base rubber layer 2 using a high-frequency power supply, and the distance from the electrode is 3 mm. The corona treatment was performed for 10 seconds at an angle of 90 degrees. And after apply | coating the coating liquid which consists of the said coating-film layer forming material to the outer peripheral surface of the base rubber layer 2 by which the said process was performed, the coating layer 3 is formed in the outer peripheral surface of the base rubber layer 2 by performing a drying and heat processing. (Thickness 5 μm) was formed to obtain a two-layer roller (see FIG. 1).
[0037]
[Example 2]
In place of γ-mercaptopropyltrimethoxysilane, a coating layer forming material was prepared in the same manner as in Example 1 except that 5 parts of γ-glycidyloxypropyltrimethoxysilane (A-187, manufactured by Nihon Unicar Company) was blended. Prepared. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0038]
[Example 3]
A coating layer forming material was prepared in the same manner as in Example 1 except that the blending ratio of γ-mercaptopropyltrimethoxysilane was changed to 15 parts. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0039]
[Example 4]
A coating layer forming material was prepared in the same manner as in Example 1 except that the blending ratio of γ-mercaptopropyltrimethoxysilane was changed to 0.01 part. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0040]
[Example 5]
A coating layer forming material was prepared in the same manner as in Example 1 except that the blending ratio of γ-mercaptopropyltrimethoxysilane was changed to 20 parts. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0041]
[Example 6]
A coating layer forming material was prepared in the same manner as in Example 1 except that the blending ratio of γ-mercaptopropyltrimethoxysilane was changed to 0.005 part. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0042]
[Example 7]
100 parts of ACM (Denka ER3400, manufactured by Denki Kagaku), 5 parts of γ- (methacryloxypropyl) trimethoxysilane (A-174, manufactured by Nihon Unicar), 0.5 parts of stearic acid, zinc white (ZnO) ) 5 parts, 30 parts of acetylene black, 1 part of Diak # 1 and 2 parts of Soxinol DT (manufactured by Sumitomo Chemical Co., Ltd.) were mixed and dispersed to prepare a rubber composition as a coating layer forming material. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0043]
[Example 8]
100 parts of BR (Nipol BR1220NM, manufactured by Nippon Zeon), 5 parts of γ-mercaptopropyltrimethoxysilane, 0.5 part of stearic acid, 5 parts of zinc white (ZnO), 30 parts of acetylene black, and Sunseller CZ -G (manufactured by Sanshin Chemical Co., Ltd.) 1.07 parts, Noxeller BZ-P (manufactured by Ouchi Shinsei Chemical Co., Ltd.) 0.49 parts, and powder sulfur 1 part are mixed and dispersed to form a coating layer material. A rubber composition was prepared. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0044]
[Example 9]
100 parts of IR (Kuraprene IR-10, manufactured by Kuraray Co., Ltd.), 5 parts of γ-mercaptopropyltrimethoxysilane, 0.5 part of stearic acid, 5 parts of zinc white (ZnO), 30 parts of acetylene black, Sunceller 1.07 parts of CZ-G, 0.49 parts of Noxeller BZ-P and 1 part of powdered sulfur were mixed and dispersed to prepare a rubber composition as a coating layer forming material. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0045]
[Example 10]
Hydrine rubber (Epichromer CG102, manufactured by Daiso Corporation) 100 parts, γ-mercaptopropyltrimethoxysilane 5 parts, stearic acid 0.5 parts, zinc white (ZnO) 5 parts, acetylene black 30 parts, hydrotalcite 5 parts of DHT-4A (manufactured by Kyowa Chemical Industry Co., Ltd.), 1.07 parts of Sunseller CZ-G, 0.49 parts of Noxeller BZ-P and 1 part of powdered sulfur are mixed and dispersed to form a coating layer material. A rubber composition was prepared. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0046]
Example 11
100 parts of SBR (Toughden 2000R, manufactured by Asahi Kasei Co., Ltd.), 5 parts of γ-mercaptopropyltrimethoxysilane, 0.5 part of stearic acid, 5 parts of zinc white (ZnO), 30 parts of acetylene black, Noxeller DM- By mixing and dispersing 1.5 parts of P (manufactured by Ouchi Shinsei Chemical Co., Ltd.), 0.6 parts of Noxeller TRA (manufactured by Ouchi Shinsei Chemical Co., Ltd.) and 0.43 parts of powdered sulfur, A rubber composition was prepared. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0047]
Example 12
100 parts CR (Neoprene WRT, Showa Denki, DuPont), 5 parts bispropyltriethoxysilane tetrasulfide (A-1289, Nihon Unicar), 0.5 parts stearic acid, zinc white (ZnO) 5 parts, 4 parts of magnesium oxide (Kyowa Mag # 150, manufactured by Kyowa Chemical Co., Ltd.), 30 parts of acetylene black, and 1 part of Sunseller 22C (manufactured by Sanshin Chemical Co., Ltd.) A rubber composition was prepared. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0048]
Example 13
100 parts urethane rubber (UN278, manufactured by Sakai Chemical Industry Co., Ltd.), 5 parts γ-mercaptopropyltrimethoxysilane, 30 parts acetylene black, 1 part zinc stearate, 4 parts Noxeller DM-P, and powdered sulfur 1 Part, 1 part of curacene, and 2 parts of Soxinol MP (manufactured by Sumitomo Chemical Co., Ltd.) were mixed and dispersed to prepare a rubber composition as a coating layer forming material. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0049]
[Comparative Example 1]
A coating layer forming material was prepared in the same manner as in Example 1 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0050]
[Comparative Example 2]
A coating layer forming material was prepared in the same manner as in Example 7 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0051]
[Comparative Example 3]
A coating layer forming material was prepared in the same manner as in Example 8 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0052]
[Comparative Example 4]
A coating layer forming material was prepared in the same manner as in Example 9 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0053]
[Comparative Example 5]
A coating layer forming material was prepared in the same manner as in Example 10 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0054]
[Comparative Example 6]
A coating layer forming material was prepared in the same manner as in Example 11 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0055]
[Comparative Example 7]
A coating layer forming material was prepared in the same manner as in Example 12 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0056]
[Comparative Example 8]
A coating layer forming material was prepared in the same manner as in Example 13 except that no silane coupling agent was added. Then, a base rubber layer forming material similar to that in Example 1 was prepared, and a roller was manufactured by the same manufacturing method as in Example 1.
[0057]
For each roller thus obtained, the interlayer adhesion between the base rubber layer and the coating layer and the surface hardness of the coating layer were measured and evaluated according to the following methods. The results are shown in Tables 1 to 3 below.
[0058]
[Interlayer adhesion]
As shown in FIG. 3 (a), the roller coating layer 3 is cut along the outer periphery with a width of 2.5 cm as indicated by a broken line X. Cut in the gold direction (broken line Y), peel off the coating layer 3 a little from there, and as shown in FIG. 3 (b), the edge of the stripped coating layer 3 is AGS Autograph (Shikuma Corp.) ) In the vertical direction (arrow Z direction), and the tensile strength was measured. And the thing whose tensile strength is 3N or more was displayed as (circle), 1N or more and less than 3N as (triangle | delta), and less than 1N as x.
[0059]
〔surface hardness〕
The surface hardness of the coating layer 3 formed on the roller was measured and evaluated using a micro rubber hardness meter MD-1 type (manufactured by Kobunshi Keiki Co., Ltd.). That is, MD-1 of less than 45 ° was indicated as ◎, 45 ° or more and less than 47 ° as ○, 47 ° or more and less than 49 ° as Δ, and 49 ° or more as ×.
[0060]
[Table 1]

[0061]
[Table 2]

[0062]
[Table 3]

[0063]
From the results of Tables 1 to 3, all of the example products are excellent in the interlayer adhesion between the base rubber layer 2 and the coating film layer 3 and the surface hardness of the coating film layer 3 is also good. Recognize. On the other hand, it can be seen that the comparative product is inferior to the evaluation of either the interlayer adhesion force or the surface hardness.
[0064]
【The invention's effect】
As described above, the roller for OA equipment of the present invention contains a specific rubber material (A) and a specific silane coupling agent (B) on the activation treatment surface of the base rubber layer mainly composed of silicone rubber. The coating layer which consists of a rubber composition to form is formed and comprised. That is, in the present invention, the activation treatment surface of the base rubber layer and the coating layer are firmly united and integrated by the chemical action of the specific silane coupling agent (B). Even if an adhesive is not applied to the chemical treatment surface, it is possible to prevent the coating layer from being peeled off or torn. Moreover, since the adhesive application step is not necessary, the step can be omitted.
[0065]
In particular, the silane coupling agent (B) is γ-mercaptopropyltrimethoxysilane, γ- (methacryloxypropyl) trimethoxysilane, vinyltris (βmethoxyethoxy) silane, γ-glycidyloxypropyltrimethoxysilane, N -Β (aminoethyl) γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, bispropyltriethoxysilane tetrasulfide, propyltriethoxysilane isocyanate In the case of at least one selected from the group, the coating layer is more firmly bonded to the base rubber layer, so that it is particularly suitable as a roller for OA equipment.
[0066]
In addition, when NBR is used as the rubber material of the above (A), a coating layer having a lower hardness can be obtained than when hydrogenated acrylonitrile-butadiene rubber is used, so that it is particularly suitable as a roller for OA equipment. It will be a thing.
[0067]
When the roller for office automation equipment according to the present invention is incorporated in an electrophotographic copying machine as a developing roller, for example, deterioration in image quality is prevented, and a high-quality copy image can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a roller for office automation equipment according to the present invention.
FIG. 2 is an explanatory view showing a method for producing a roller for office automation equipment according to the present invention.
3A is a side view of a roller, and FIG. 3B is a schematic diagram for explaining a method for measuring an interlayer adhesion force of a coating film layer of the roller.
[Explanation of symbols]
1 shaft body 2 base rubber layer 3 coating layer

Claims (3)

A roller for office automation equipment in which a base rubber layer whose main component is silicone rubber and whose outer peripheral surface is activated is formed on the outer periphery of the shaft body, and a coating layer is formed on the outer peripheral surface of the base rubber layer And the said coating-film layer is formed with the rubber composition containing the following (A) and (B), The roller for OA equipment characterized by the above-mentioned.
(A) Acrylonitrile-butadiene rubber (NBR), acrylic rubber (ACM), butadiene rubber (BR), isoprene rubber (IR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), hydrin rubber (ECO, CO) and At least one selected from the group consisting of urethane rubber .
(B) A silane coupling agent represented by any one of the following general formulas (1) and (2).

[Wherein Y ¹ represents a vinyl group, a glycidoxy group, a mercapto group, an amino group, an epoxy group, an isocyanate group, a methacryl group, or other substituents including these functional groups. N is 1 or 2. ]

[Wherein Y ² is a vinyl group. ]   The silane coupling agent (B) is γ-mercaptopropyltrimethoxysilane, γ- (methacryloxypropyl) trimethoxysilane, vinyltris (βmethoxyethoxy) silane, γ-glycidyloxypropyltrimethoxysilane, N-β. (Aminoethyl) γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, bispropyltriethoxysilane tetrasulfide, propyltriethoxysilane isocyanate The roller for office automation equipment according to claim 1, which is at least one selected.   The roller for office automation equipment according to claim 1 or 2, wherein the rubber material (A) is acrylonitrile-butadiene rubber.

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