JP4356569B2 - Rubber member for conveyance of OA equipment - Google Patents

Description

  The present invention relates to a conveyance rubber member for office automation equipment used for, for example, a paper feed roller or a double feed prevention pad of office automation equipment such as a copier or printer.

In general office automation equipment such as copiers and printers, rubber rollers and pads are used to feed paper, OHP film, etc., and to prevent paper discharge and double feed. The rubber member used for transporting such paper is required to have an appropriate coefficient of friction with respect to paper and the like, and to have a small amount of wear. EPDM rubber having excellent wear resistance and environmental resistance (particularly against O ₃ and heat) is used.

  Here, in general EPDM rubber, a zinc compound such as zinc oxide is used as a vulcanization accelerator for accelerating a crosslinking reaction when a polymer is crosslinked by vulcanization or the like. However, since this zinc compound contains cadmium (Cd), lead (Pb), and the like as impurities, and these metals may adversely affect the environment, it may be problematic.

  In addition, the prior art regarding this invention has not been discovered.

  From the above, it is desired to provide a rubber member for transporting OA equipment in which cadmium, lead and the like are intentionally reduced.

The present invention provides a rubber member for transporting OA equipment, characterized by comprising EPDM rubber as a main component and containing no zinc compound and titanium oxide .

  The present invention relates to a conveyance rubber member for office automation equipment used for, for example, a paper feed roller or a double feed prevention pad of office automation equipment such as a copier or printer.

  The rubber member for conveying OA equipment of the present invention is characterized in that it contains EPDM rubber as a main component and does not contain a zinc compound.

  As described above, in a rubber member mainly composed of EPDM rubber used for general OA equipment or the like, a zinc compound such as zinc oxide is usually used as an accelerator when vulcanizing the EPDM rubber. However, this zinc compound contains a small amount of metals such as cadmium and lead, and it has been difficult to remove these metals in the production process. Therefore, when these zinc compounds are used as materials, there is a problem that cadmium, lead and the like are contained in the rubber member, which may adversely affect the environment.

  Therefore, in the present invention, in order to solve these problems, by not having a zinc compound, cadmium, lead and the like are intentionally reduced in the rubber member for conveying OA equipment, and it has an adverse effect on the environment. A rubber member for conveying OA equipment that does not affect Further, according to the present invention, the amount of wear and the coefficient of friction required for the rubber member for conveying OA equipment are compared with the performance of the general rubber member for conveying OA equipment containing the zinc compound. And can be used in place of conventional products.

  In such a rubber member, titanium oxide is usually used as a white pigment, but since this titanium oxide also contains cadmium, lead, etc., the content of this titanium oxide is also reduced. It is preferable to reduce the amount of cadmium, lead, etc. contained in the rubber member for conveying OA equipment. Specifically, the titanium oxide content is preferably 1 part by weight or less per 100 parts by weight of a rubber component including EPDM rubber and other rubber described later, and is preferably not contained at all. This is because the influence of the metal on the environment can be reduced.

  Furthermore, if the unvulcanized rubber kneaded with zinc oxide added is allowed to stand, vulcanization may proceed due to changes over time (burning may occur), and a vulcanizing agent may be added to such unvulcanized rubber. The kneaded product may change over time. Thus, when it has zinc oxide, there existed a problem that it was difficult to manufacture the stable product with fixed quality. However, since the present invention does not have a zinc compound, it has an advantage of high stability.

  Moreover, in the general rubber member for conveyance of OA equipment, when the said zinc oxide is used with the stearic acid mentioned later, depending on the compounding quantity, zinc stearate is formed and it is on the surface of the rubber member for conveyance of OA equipment. In some cases, the deposition force causes the conveyance force of the conveyance rubber member for OA equipment, the contamination of the object to be conveyed, and the like. In this invention, since the said zinc oxide is not contained, it can be set as the possibility that these problems will not arise.

  In the rubber member for transporting OA equipment of the present invention, the cadmium content is preferably 0.01 ppm or less in the rubber member for transporting OA equipment, and particularly preferably contains no cadmium. . Moreover, it is preferable that lead content is 1 ppm or less in the rubber member for conveyance for OA apparatuses, and it is preferable that lead is not contained at all.

  As such a rubber member for conveying OA equipment, the material is not particularly limited as long as it contains EPDM rubber as a main component and does not contain the zinc oxide and titanium oxide. For example, EPDM rubber, It can be obtained by kneading a mixture in which a plasticizer, a silane coupling agent, a filler, a pigment, and the like are mixed, and crosslinking the kneaded product.

  Here, in the present invention, the term “EPDM rubber as a main component” means that the EPDM rubber is contained in an amount of 50% by weight or more, preferably in the range of 80% by weight to 100% by weight in the rubber component including EPDM and other rubbers. I will say that. EPDM includes a non-oil-extended EPDM composed only of a rubber component and an oil-extended EPDM including a rubber component and a confidential oil. In the present invention, any type of EPDM may be used. When an oil-extended EPDM is used, it is preferable that the rubber component excluding the confidential oil is contained in the above-mentioned range in the rubber member for conveying OA equipment. The diene component of the EPDM rubber is not particularly limited, and for example, ethylidene norbornene (ENB), dichloropentadiene (DCPD), or the like can be used.

  Further, the rubber member for conveying OA equipment of the present invention may contain rubber other than the above EPDM rubber. Examples of rubbers other than EPDM rubber that can be used in the present invention include butyl rubber, butadiene rubber (BR), isoprene rubber, styrene butadiene rubber (SBR), chloroprene rubber (CR), natural rubber (NR), and chlorosulfone. Hydrogenated polyethylene rubber (CSM), epichlorohydrin-ethylene oxide copolymer rubber (CIIC), epichlorohydrin homopolymer rubber (CHR), nitrile rubber (NBR) hydride, chlorinated polyethylene, urethane rubber, silicon-ethylene propylene mixed rubber, 1, Examples include 2-polybutadiene, acrylonitrile-butadiene rubber, ethylene propylene rubber (EPM), acrylic rubber, and chlorosulfonated polyethylene, and one or more of these can be used.

  In the present invention, a silane coupling agent is preferably used from the standpoint of improving wear resistance. Examples of such a silane coupling agent include vinyltriethoxysilane, vinyl-tri (2- Methoxyethoxy) silane, vinyltrichlorosilane, γ-methacryloxypropyltriethoxysilane, γ-aminopropyltrimethoxysilane, bis (3-triethoxysilylpropyl) tetrasulfene, 3-methacryloxypropylmethyldimethoxysilane, 3- Methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, γ-glycidoxydoxypropyltrimethoxysilane, γ-glycidoxydoxypropylmethyldimethoxysilane , Γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyldimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxy Silane, γ-glycidoxypropyltrimethoxysilane, β-glycidoxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-mercaptopropyltrimethoxysilane, hexamethyl Disilazane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, aminosilane, N-β- (N-vinylbenzylaminoethyl) -γ -Aminopropyltrimethoxysilane / hydrochloride, γ-mercaptopropyltrimethoxysilane, vinyltriacetoxysilane, γ-anilinopropyltrimethoxysilane, vinyltrimethoxysilane, octadecyldimethyl (3- (trimethoxysilyl) propyl) ammonium Examples include chloride, γ-glycidoxypropylmethyldimethoxysilane, and γ-ureidopropyltriethoxysilane.

  Such a silane coupling agent can usually be contained in the range of 0.5 to 8 parts by weight per 100 parts by weight of the rubber component including EPDM rubber and other rubbers.

  Here, in the present invention, as the silane coupling agent, those containing sulfur in the molecular chain may be used. In the present invention, a silane coupling agent not containing sulfur is used. It is preferable. The sulfur contained in the rubber member for transporting OA equipment may also be a problem from the environmental aspect. By using a silane coupling agent that does not contain sulfur, it is contained in the rubber member for transporting OA equipment. This is because the amount of sulfur to be reduced can be reduced. Specific examples of the sulfur-free silane coupling agent include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyl. Triethoxysilane, γ-glycidoxydoxypropyltrimethoxysilane, γ-glycidoxydoxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyldimethoxysilane, γ-chloropropyltrimethoxysilane N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β-glyci Xypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, hexamethyldisilazane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) ) Aminopropylmethyldimethoxysilane, aminosilane, N-β- (N-vinylbenzylaminoethyl) -γ-aminopropyltrimethoxysilane / hydrochloride, vinyltriacetoxysilane, γ-anilinopropyltrimethoxysilane, vinyltrimethoxy Examples thereof include silane, octadecyldimethyl (3- (trimethoxysilyl) propyl) ammonium chloride, γ-glycidoxypropylmethyldimethoxysilane, and γ-ureidopropyltriethoxysilane.

  In the rubber member for conveying OA equipment of the present invention, oil can also be used as a plasticizer. Such oil is known per se made of paraffinic or naphthenic mineral oil or hydrocarbon oligomer. Synthetic oil or process oil. Examples of synthetic oils include α-olefin oligomers, butene oligomers, ethylene and α-olefin oligomers, and the like.

  When oil is contained in the rubber member for transporting OA equipment of the present invention, it can be usually contained at 180 parts by weight or less, especially 150 parts by weight or less per 100 parts by weight of the rubber component. Further, in the present invention, a synthetic plasticizer may be contained, and such a synthetic plasticizer is usually 60 wt. Per 100 parts by weight of the rubber component when a rubber member for transporting OA equipment is used for a pad or the like. It is preferable to contain 50 parts by weight to 130 parts by weight per 100 parts by weight of the rubber component when the rubber member for transporting OA equipment is used as a paper feeding member. Here, generally, when a large amount of the above oil is added, the mixture before cross-linking is likely to be sticky, and it may be difficult to form as a rubber member for transporting OA equipment. In such a case, molding can be facilitated by coating a mold used for molding with fluorine or the like.

  Further, in the present invention, in order to improve the mechanical strength of the rubber member for conveying OA equipment, it is possible to contain a filler as necessary. Examples of such a filler include silica. , Carbon black, clay, talc, calcium carbonate, dibasic phosphite (DLP), basic magnesium carbonate, alumina, and the like. Among them, silica is preferably used.

Here, silica is generally classified into hydrophobic silica and wet silica, and hydrophobic silica is usually used in the present invention because hydrophobic silica has fewer impurities than wet silica. Is preferred. Thereby, the amount of cadmium, lead and the like in the rubber component can be made smaller, and a rubber member for transporting OA equipment that is more environmentally friendly can be obtained.

  Such a filler can be contained usually in the range of 0 to 100 parts by weight, particularly in the range of 0 to 50 parts by weight per 100 parts by weight of the rubber component.

  Further, in the present invention, a pigment for coloring can also be contained. In addition to the above-described titanium oxide, for example, carbon black, pigments generally used for rubber, plastics, and the like can be used. .

  Such a pigment can usually be contained within a range of 0.01 to 3 parts by weight per 100 parts by weight of the rubber component.

  In the present invention, besides the above-described materials, for example, stearic acid, anti-aging agents, waxes, polyethylene glycol and other lubricants, plasticizers, and the like can be used.

  The rubber member for conveyance of OA equipment of the present invention can be manufactured by melt-kneading and cross-linking a mixture obtained by mixing the above materials. The mixture can be kneaded using a general kneading apparatus, for example, a known kneading apparatus such as an open roll, a kneader, or a Banbury mixer.

  Further, the forming of the rubber for transportation for OA equipment may be performed simultaneously with the crosslinking of the kneaded material after the kneading, or may be performed before the crosslinking. At this time, the crosslinking is generally used when crosslinking the EPDM rubber, for example, guanidine-based, thiuram-based, dithiocarbamate-based, thiazole-based, sulfenamide-based various vulcanizing agents, or a mixture of two or more. However, in the present invention, it is particularly preferable to perform peroxide crosslinking using a peroxide crosslinking agent or the like. Thereby, sulfur is not contained in the formed rubber member for transporting OA equipment, and as described above, there can be no influence on the environment. As such a peroxide crosslinking agent, those generally used for peroxide crosslinking of EPDM rubber can be used. For example, 1,3-bis (tertiary butyl peroxyisopropyl) benzene, 2, 5-dimethyl-2,5-di (tertiarybutylperoxy) hexyne-3, dicumyl peroxide, 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, 1,1-diterebutylperoxy-3, 3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-dibenzoylperoxyhexane, n-butyl-4,4-diterebutylperoxyvalerate, terebutylperoxybenzoate, diterebutylperper Oxydiisopropylbenzene, terebutyl cumyl peroxide, 2,5-dimethyl-2,5-di Les-butylperoxy hexane, di tele-butyl peroxide, 2,5-dimethyl-2,5-di tele-butylperoxy f Xing -3 etc. may be used alone or in combination.

  Such a vulcanizing agent and a peroxide crosslinking agent are usually added in the range of 2 to 10 parts by weight, particularly in the range of 2 to 4 parts by weight with respect to 100 parts by weight of the kneaded product. Can be used. In addition, the said content is a value when a vulcanizing agent and a peroxide crosslinking agent are not diluted.

  In the present invention, it is preferable that the peroxide crosslinking agent does not contain a metal oxide as a diluent. In general, the peroxide cross-linking agent may be used as a powder mixed with a metal oxide such as silica or talc in order to facilitate kneading into the kneaded product. is there. However, in this case, since metals such as cadmium and lead may be contained as impurities in the metal oxide, it is more environmentally friendly by using the peroxide crosslinking agent that does not contain a metal oxide. It is because it can be set as the rubber member for conveyance for OA equipment in consideration of.

  In addition, in the rubber member for conveyance of OA equipment of this invention, it is preferable that content of sulfur is 100 ppm or less in the rubber member for conveyance of OA equipment, and it is especially preferable that sulfur is not contained at all.

  In addition, the molding is performed according to the use of the rubber member for conveying OA equipment. For such molding, transfer molding used for molding general rubber, baking molding for bonding with metal parts, Extrusion molding, injection molding, compression molding methods and the like can be used.

  The use of the rubber member for transporting OA equipment of the present invention is particularly limited as long as it is used as a roller or the like when transporting paper, OHP film, etc. in various OA equipment such as a copy or printer. For example, a paper feed roller, a paper discharge roller, a double feed prevention pad, a transfer roller, a conductive roller, or the like can be used.

  Here, it is preferable that the performance of the rubber member for conveyance of OA equipment of the present invention is equivalent to that of a general rubber member for conveyance of OA equipment. As a result, as described above, it has no influence on the environment, and has been replaced with those conventionally used in various places of OA equipment such as a paper feed roll, a paper discharge roll, and a double feed prevention pad. It is because it becomes possible to use it. The friction coefficient is a value measured by the following method. First, for example, as shown in FIG. 1, a rubber 2 used for the above-mentioned rubber member for transporting OA equipment is formed on a shaft 1 having a diameter of 22 mm, a diameter of 30 mm, and a width of 8 mm. 3 and pb-sk64g paper (trade name, manufactured by Canon Inc.) 4 are put in close contact with each other. Subsequently, the friction coefficient of the rubber 2 measured by the load cell 6 after a 200 g weight 5 is hung on the roll 3 and the shaft 1 is rotated for 60 minutes with a load of 200 g applied to the rubber 2.

  Further, the amount of rubber wear (= (weight of rubber before the above test−weight of rubber after 60 minutes of the above test) / weight of rubber before the above test) is a rubber for transporting OA equipment. Although it differs according to the use of the member, etc., it is preferable that each has the same performance as that conventionally used.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

[Example 1]
EPDM rubber (made by DSM, trade name: 7631A), silica (made by Nippon Silica, trade name: nip seal ER), black pigment, sulfur-free silane coupling agent are kneaded and vulcanized with a peroxide vulcanizing agent. Thus, a rubber member for conveying OA equipment of the present invention was obtained. The composition ratio is shown in Table 1.
For example, as shown in FIG. 1, the obtained rubber member for transporting OA equipment is formed into a roll by forming a rubber 2 obtained on a shaft 1 having a diameter of 22 mm so that the diameter is 30 mm and the width is 8 mm. The roll 3 and pb-sk 64 g paper (trade name, manufactured by Canon Inc.) 4 are put in close contact with each other, a 200 g weight 5 is hung on the roll 3, a load of 200 g is applied to the rubber 2 and the shaft 1 is placed for 60 minutes. The amount of wear and the friction coefficient of the rubber 2 measured by the load cell 6 were measured after the rotation.
Also, the friction coefficient reduction rate of rubber [rubber friction coefficient reduction rate = ((rubber coefficient before the above test−rubber coefficient after 60 minutes of the above test) / friction coefficient of the rubber before the above test] ) × 100 (%)], and the wear rate at this time [wear rate = ((weight of rubber before the above test−weight of rubber after 60 minutes of the above test)) / of the rubber before the above test Weight) × 100 (%)] was also calculated. These values are shown in Table 1.
Moreover, it calculated about the amount of cadmium and the amount of lead contained in the said rubber member for conveyance for OA equipment. Lead was calculated as 0.003% by weight in zinc oxide and 30 ppm in titanium oxide, and cadmium was calculated as 0.0001% by weight in zinc oxide and 0.5 ppm in titanium oxide. As for the amount of sulfur, 80% by weight in sulfur (after removing impurities), 52.9% by weight in TT (Sunseller TT (trade name, manufactured by Sanshin Chemical Co., Ltd., tetramethylthiuram disulfide)), TRA (Sunseller) TRA (trade name, manufactured by Sanshin Chemical Co., Ltd., dipentamethylene thiuram tetrasulfide)) 32.9% by weight, M (Sunseller M (trade name, manufactured by Sanshin Chemical Co., Ltd., 2-mercaptobenzothiazole)) 38.0% by weight, calculated as 21.5% by weight in BZ (Sunseller BZ (trade name, manufactured by Sanshin Chemical Co., Ltd., zinc dibutyldithiocarbamate)).

[Example 2]
The same procedure as in Example 1 was performed except that titanium oxide was added as a white pigment. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Example 3]
The same procedure as in Example 1 was performed except that titanium oxide was added as a white pigment. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Example 4]
The same procedure as in Example 1 was carried out except that a silane coupling agent was not added and a peroxide vulcanizing agent containing no diluent was used. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Example 5]
The same procedure as in Example 1 was performed except that hydrophobic silica was used without adding a silane coupling agent. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Comparative Example 1]
The same operation as in Example 1 was performed except that zinc oxide was added. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Comparative Example 2]
The same procedure as in Example 1 was performed except that titanium oxide was added as zinc oxide, stearic acid, and white pigment. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Comparative Example 3]
The same procedure as in Comparative Example 2 was performed except that sulfur vulcanization was performed and no silane coupling agent was added. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

[Comparative Example 4]
This was performed in the same manner as in Comparative Example 2 except that sulfur vulcanization and a silane coupling agent containing sulfur were used. Table 1 shows the composition, the amount of wear, the friction coefficient reduction rate, the cadmium content, the lead content, and the sulfur content.

It is a schematic sectional drawing which shows the apparatus for measuring the friction coefficient and wear amount of the rubber member for conveyance of OA apparatuses of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shaft 2 ... Rubber 3 ... Roll 4 ... Paper 5 ... Weight 6 ... Load cell

Claims (5)

A rubber member for transporting OA equipment, characterized by comprising EPDM rubber as a main component and not containing a zinc compound and titanium oxide . The rubber member for conveying OA equipment according to claim 1, comprising a silane coupling agent not containing sulfur . The rubber member for conveying OA equipment according to claim 1 , wherein the rubber member is formed by peroxide crosslinking . The rubber member for conveying OA equipment according to claim 3, wherein a peroxide cross-linking agent not containing a metal oxide is used as a diluent . The rubber used for conveying OA equipment according to any one of claims 1 to 4, wherein silica used as a filler is hydrophobic silica .

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