CN115960452A - Rubber composition for paper feed roller and paper feed roller - Google Patents
Rubber composition for paper feed roller and paper feed roller Download PDFInfo
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- CN115960452A CN115960452A CN202210895187.0A CN202210895187A CN115960452A CN 115960452 A CN115960452 A CN 115960452A CN 202210895187 A CN202210895187 A CN 202210895187A CN 115960452 A CN115960452 A CN 115960452A
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Abstract
The invention provides a paper feed roller capable of inhibiting the reduction of friction coefficient even if paper containing more silicate components such as silicon dioxide and talcum is repeatedly conveyed. A rubber composition for a paper feed roller, characterized by comprising (A) a base rubber containing an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer and (B) a vulcanizing agent containing a thiourea compound and/or a triazine compound.
Description
Technical Field
The present invention relates to a rubber composition for forming a paper feed roller.
Background
Various paper feed rollers are incorporated in paper feed mechanisms of machines such as an electrostatic copier, a laser printer, a plain paper facsimile machine, a combination device thereof, an image forming apparatus such as an ink jet printer, and an Automated Teller Machine (ATM). The paper feed roller rotates while contacting paper (including plastic films and the like, the same applies hereinafter), and transfers the paper by friction.
As the paper feed roller, a roller made of ethylene-propylene-diene rubber (EPDM) is often used. However, in the roller made of EPDM, when paper having a large amount of dust is repeatedly conveyed, the friction coefficient of the paper feed roller is reduced, and a conveyance failure such as non-conveyance may occur. Therefore, as in patent document 1, it is proposed to dope EPDM with Isoprene Rubber (IR) to suppress a decrease in the friction coefficient of the roller.
In addition, it has been proposed to use epichlorohydrin rubber as a material for a paper feed roller, and for example, patent document 2 describes a paper feed belt containing epichlorohydrin rubber and a sulfur-based vulcanizing agent.
Documents of the prior art
Patent document
[ patent document 1 ] Japanese patent application laid-open No. 2014-34428
[ patent document 2 ] Japanese patent laid-open publication No. 2018-100165
Disclosure of Invention
Problems to be solved by the invention
When a paper feed roller repeatedly conveys paper containing silica or silicate components, the friction coefficient of the paper feed roller is reduced, and a conveyance failure occurs.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a paper feed roller capable of suppressing a decrease in friction coefficient even when paper containing a large amount of silicate components such as silica and talc is repeatedly conveyed.
Means for solving the problems
The rubber composition for a paper feed roller according to the present invention is characterized by containing (a) a base rubber containing an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer and (B) a vulcanizing agent containing a thiourea compound and/or a triazine compound.
The rubber composition contains a specific indene alkanol (hydrin) series rubber as (A) a base rubber and a thiourea compound and/or triazine compound as (B) a vulcanizing agent, so that the obtained paper feed roller can inhibit the reduction of the friction coefficient even if the paper containing a large amount of silicate components is repeatedly conveyed. Further, although there are some indene alkanol-based rubbers which can be sulfur-crosslinked or peroxide-crosslinked, when these crosslinking agents are used, desired roll characteristics cannot be obtained.
ADVANTAGEOUS EFFECTS OF INVENTION
When the rubber composition for a paper feed roller of the present invention is used, a paper feed roller in which a decrease in the friction coefficient is suppressed can be produced even when paper containing a large amount of silicate components such as silica and talc is repeatedly conveyed.
Drawings
Fig. 1 is a perspective view showing an example of the conductive rubber roller of the present invention.
FIG. 2 is a schematic diagram illustrating a method of measuring a friction coefficient.
Fig. 3 is a schematic diagram illustrating a repetitive paper-passing simulation experiment.
Description of the symbols
1: paper feed roller, 2: roller main body, 3: through hole, 4: shaft, 10: plate, 11: paper, 12: a load cell, 13: driven roller, 14: a belt, 15: and (3) a plate.
Detailed Description
< rubber composition for paper feed roller >
The rubber composition for paper feed rollers contains (A) a base rubber and (B) a vulcanizing agent.
(A) Base rubber
The base rubber (A) contains an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer. (A) The base rubber may be used alone in 1 kind, or may be used in combination of 2 or more kinds.
The epichlorohydrin-ethylene oxide copolymer and/or the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer preferably has an ethylene oxide content of 50mol% or more, more preferably 55mol% or more, and still more preferably 60mol% or more. When the content of the ethylene oxide component is 50mol% or more, the decrease in the friction coefficient when a paper containing a large amount of silica or talc is conveyed is further suppressed. When the base rubber (A) contains 2 or more kinds of epichlorohydrin-ethylene oxide copolymers and/or epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymers, the average content of ethylene oxide components contained in these copolymers is calculated.
The (a) base rubber is preferably constituted only of an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer. The base rubber (a) may contain other rubber components than the epichlorohydrin-ethylene oxide copolymer and the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer. In this case, the total content of the epichlorohydrin-ethylene oxide copolymer and/or the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer in the base rubber (a) is 50% by mass or more, preferably 85% by mass or more, more preferably 90% by mass or more, and still more preferably 95% by mass or more.
Examples of the other rubber component include epichlorohydrin homopolymers, epichlorohydrin-allyl glycidyl ether copolymers, epichlorohydrin-propylene oxide-allyl glycidyl ether copolymers, ethylene-propylene-diene copolymers (EPDM), ethylene-propylene copolymers (EPM), ethylene-butene copolymers (EBR), ethylene-octene copolymers (EOR), ethylene-propylene-butene copolymers (EPBR), ethylene-butene-diene copolymers (EBDM), ethylene-propylene-butene-diene copolymers (bdepm), nitrile rubbers (NBR), styrene Butadiene Rubbers (SBR), chloroprene Rubbers (CR), acrylic rubbers, butyl rubbers, and silicone rubbers. These other rubber components may be used alone, or 2 or more of them may be used in combination.
(B) Vulcanizing agent
The vulcanizing agent (B) contains a thiourea compound and/or a triazine compound. The vulcanizing agent (B) may be used alone in 1 kind, or may be used in combination of 2 or more kinds. The rubber composition for a paper feed roller preferably contains only a thiourea compound as the vulcanizing agent (B) in the embodiment, or only a triazine compound as the vulcanizing agent (B) in the embodiment.
The amount of the thiourea compound and/or the triazine compound to be mixed is preferably 0.1 part by mass or more, more preferably 0.3 part by mass or more, further preferably 0.5 part by mass or more, preferably 10 parts by mass or less, more preferably 5 parts by mass or less, further preferably 2 parts by mass or less, per 100 parts by mass of the base rubber (a). When the amount is 0.1 parts by mass or more, the base rubber is sufficiently crosslinked, and the physical properties of the molded article become better, and when the amount is 10 parts by mass or less, the paper feed roller does not become too hard, and the decrease in the friction coefficient due to use is further suppressed.
As the thiourea compound, a compound represented by formula (1) is preferable.
[ CHEM 1 ]
[ in the formula (1), R 1 ～R 4 Each independently represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an aryl group having 6 to 10 carbon atoms. R 2 And R 3 May be bonded to each other.]。
As a result of said R 1 ～R 4 The alkyl group having 1 to 12 carbon atoms may be branched, branched or cyclic. The alkyl group preferably has 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms, and still more preferably 1 to 4 carbon atoms. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group.
As a result of said R 1 ～R 4 As the aryl group, phenyl and naphthyl are exemplified.
Examples of the thiourea compound include ethylene thiourea, trimethyl thiourea, N '-diethyl thiourea, tributyl thiourea, dibutyl thiourea, dilauryl thiourea, and N, N' -diphenyl thiourea. Among these, ethylene thiourea is preferred.
As the triazine compound, a triazine thiol compound having a triazine ring structure and a thiol group directly bonded to the triazine ring is preferable.
As the triazine thiol compound, a compound represented by formula (2) is preferable.
[ CHEM 2 ]
[ formula (2) wherein X 1 And X 2 Each independently represents a thiol group, -NR 11 R 12 And (4) a base. Wherein R is 11 And R 12 Each independently represents an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 10 carbon atoms.]。
As said R 11 And R 12 The alkyl group having 1 to 12 carbon atoms may be linear, branched or cyclic. The alkyl group preferably has 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms, and still more preferably 1 to 4 carbon atoms. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group.
As said R 11 And R 12 Examples of the aryl group include phenyl and naphthyl.
Examples of the triazine thiol compound include 2,4, 6-trimercapto-1, 3, 5-triazine, 6-aniline-1, 3, 5-triazine-2, 4-dithiol, 6-methylamino-1, 3, 5-triazine-2, 4-dithiol, 6-dimethylamino-1, 3, 5-triazine-2, 4-dithiol, 6-ethylamino-1, 3, 5-triazine-2, 4-dithiol, 6-diethylamino-1, 3, 5-triazine-2, 4-dithiol, 6-propylamino-1, 3, 5-triazine-2, 4-dithiol, 6-dipropylamino-1, 3, 5-triazine-2, 4-dithiol, 6-butylamino-1, 3, 5-triazine-2, 4-dithiol, 6-dibutylamino-1, 3, 5-triazine-2, 4-dithiol, 6-hexylamino-1, 3, 5-triazine-2, 4-dithiol, 6-octylamino-1, 3, 5-triazine-2, 4-dithiol, 6-di-aminodecyl-1, 3, 5-triazine-2, 4-dithiol, 6-aminodecyl dithiol, and the like. Of these, 2,4, 6-trimercapto-1, 3, 5-triazine is preferable.
Acid-absorbing agent
The rubber composition for a paper feed roller may generate chlorine when the epichlorohydrin rubber is vulcanized, and therefore, it is preferable to mix an acid acceptor. As the acid scavenger, a commonly used acid scavenger can be used. As the acid scavenger, at least 1 selected from the group consisting of Hydrotalcite, magnesium oxide, calcium hydroxide, and magnesium hydroxide is preferable.
The content of the acid scavenger is preferably 1 part by mass or more, more preferably 2 parts by mass or more, further preferably 3 parts by mass or more, preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and further preferably 5 parts by mass or less, per 100 parts by mass of the base rubber (a).
Other ingredients
The rubber composition for paper feed rollers can use compounding agents usually used as compounding agents for rubber, such as a filler, a vulcanization accelerator, a vulcanization retarder, a processing aid, an antioxidant, and a pigment, within a range not to impair the gist of the present invention.
Filler
Examples of the filler include carbon black, calcium carbonate, silica, clay, talc, magnesium carbonate, and aluminum hydroxide. By mixing the filler, the mechanical strength of the obtained paper feed roller can be improved.
The content of the filler is preferably 3 parts by mass or more, more preferably 5 parts by mass or more, and further preferably 10 parts by mass or more, preferably 100 parts by mass or less, more preferably 70 parts by mass or less, and further preferably 50 parts by mass or less, per 100 parts by mass of the base rubber (a).
When carbon black is mixed as the filler, the content of carbon black is preferably 1.0 part by mass or less, more preferably 0.8 part by mass or less, and further preferably 0.5 part by mass or less, per 100 parts by mass of the base rubber (a).
Vulcanization accelerator
As the vulcanization accelerator, any of an inorganic accelerator and an organic accelerator can be used. Examples of the inorganic accelerator include calcium hydroxide, magnesium oxide (MgO), and lead oxide (PbO). Examples of the organic accelerator include guanidine accelerators, thiazole accelerators, thiuram accelerators, sulfenamide accelerators, and dithiocarbamate accelerators. The vulcanization accelerator may be used alone, or 2 or more of them may be used in combination.
Examples of the guanidine-based accelerator include 1, 3-diphenylguanidine and 1, 3-di-o-tolylguanidine.
Examples of the thiazole accelerator include 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, zinc salt of 2-mercaptobenzothiazole, cyclohexylamine salt of 2-mercaptobenzothiazole, 2- (N, N-diethylthiocarbamoylthio) benzothiazole, and 2- (4' -morpholinodithio) benzothiazole.
Examples of the thiuram-based accelerator include tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, tetrakis (2-ethylhexyl) thiuram disulfide, dipentamethylenethiuram tetrasulfide, and the like.
Examples of the sulfenamide accelerator include N-cyclohexyl-2-benzothiazylsulfenamide and N-oxydiethylene-2-benzothiazylsulfenamide.
The content of the vulcanization accelerator is preferably 0.1 part by mass or more, more preferably 0.2 part by mass or more, further preferably 0.3 part by mass or more, preferably 5 parts by mass or less, more preferably 4 parts by mass or less, and further preferably 3 parts by mass or less, per 100 parts by mass of the base rubber (a).
When the vulcanizing agent (B) contains a triazine compound, the guanidine-based accelerator is preferably contained as a vulcanization accelerator. In this case, the mass ratio of the amount of the triazine compound to the amount of the guanidine-based accelerator (triazine compound/guanidine-based accelerator) is preferably 0.5 or more, more preferably 1 or more, preferably 10 or less, and more preferably 5 or less.
The vulcanization retarder may be appropriately selected depending on the vulcanizing agent (B) to be used. Examples of the vulcanization retarder include N-cyclohexylthiophthalimide, N-nitrosodiphenylamine, phthalic anhydride, and 4,4' -dithiodimorpholine.
The content of the vulcanization retarder is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, further preferably 0.2 parts by mass or more, preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and further preferably 2 parts by mass or less, per 100 parts by mass of the base rubber (a).
When the vulcanizing agent (B) contains a thiourea compound, it preferably contains 4,4' -dithiodimorpholine as a vulcanization retarder. In this case, the mass ratio of the amount of the thiourea compound to the amount of the 4,4 '-dithiodimorpholine (thiourea compound/4, 4' -dithiodimorpholine) is preferably 0.5 or more, more preferably 1 or more, preferably 10 or less, and more preferably 5 or less.
When the vulcanizing agent (B) contains a triazine compound, N-cyclohexylthiophthalimide is preferably contained as a vulcanization retarder. In this case, the mass ratio of the amount of the triazine compound to the amount of the N-cyclohexylthiophthalimide (triazine compound/N-cyclohexylthiophthalimide) is preferably 0.5 or more, more preferably 1 or more, preferably 10 or less, and more preferably 5 or less.
Examples of the processing aid include a fatty acid having 12 to 30 carbon atoms (e.g., stearic acid), a fatty acid ester, a fatty acid metal salt, a fatty acid amide, a hydrocarbon (alkane), and the like.
Examples of the antioxidant include nickel diethyldithiocarbamate and nickel dibutyldithiocarbamate.
The rubber composition for a paper feed roller can be prepared by mixing (a) a base rubber, (B) a vulcanizing agent, and other raw materials added as needed, and kneading the mixture using a pressure kneader, a banbury mixer, an open roll, or the like. The method and conditions for kneading are appropriately selected depending on the production scale.
The hardness (durometer, type a hardness) of the cured product of the rubber composition for a paper feed roller is preferably 10 or more, more preferably 15 or more, further preferably 20 or more, preferably 90 or less, more preferably 85 or less, and further preferably 80 or less. When the hardness of the cured product is 10 or more, the hardness is suitable for conveying paper, and the conveying force is further improved, and when the hardness is 80 or less, the press-fitting into the roller shaft is easier.
The cured product of the rubber composition for the paper feed roller has high friction coefficient, and even repeatedly contacts paper containing a large amount of silicate components such as silicon dioxide and talcum, the friction coefficient is reduced. Therefore, the rubber composition for paper feeding roller can be preferably used as a material for forming a paper feeding roller, a paper feeding belt.
< paper feed roller >
The paper feed roller of the present invention is obtained by curing the rubber composition for paper feed rollers.
The shape of the paper feed roller may be cylindrical, polygonal cylindrical, or polygonal columnar. When the paper feed roller has a cylindrical shape or a polygonal cylindrical shape, the paper feed roller preferably has a shaft. The material of the shaft is not particularly limited, and examples thereof include metal, ceramic, and resin.
Fig. 1 shows an example of a paper feed roller. The paper feed roller 1 shown in fig. 1 includes a cylindrical roller body 2 and a shaft 4 inserted through a through hole 3 of the roller body 2.
The roller body 2 can be formed by, for example, press molding, extrusion molding, or the like using the rubber composition for a paper feed roller. In the press molding method, a mold having a cavity corresponding to the three-dimensional shape of the roller body 2 is prepared, and the rubber composition is filled in the cavity of the mold and heated under pressure to crosslink the rubber composition, thereby forming the roller body 2. In the extrusion molding method, the roller body 2 is formed by extrusion molding into a cylindrical shape using an extrusion molding machine to which a die corresponding to the cross-sectional shape of the roller body 2 is connected, and then crosslinking.
The roller body 2 and the shaft 4 are integrated by, for example, forming the outer diameter of the shaft 4 to be slightly larger than the inner diameter of the through-hole 3 of the roller body 2, pressing the shaft 4 into the through-hole 3, bonding the both with an adhesive, or vulcanization bonding with a vulcanization adhesive when the roller body 2 is crosslinked.
At any time before and after the integration, the both ends of the roller body 2 may be further cut as necessary so that the axial length of the roller body 2, that is, the width of the paper feed roller 1 becomes a predetermined value. In addition, the roller body 2 may be formed in a 2-layer structure of an outer layer on the outer peripheral side and an inner layer on the shaft 4 side. In this case, at least the outer layer may be formed of the rubber composition for a paper feed roller.
The paper feed roller 1 of the present invention can be used as various paper feed rollers such as a paper feed roller, a transport roller, a platen roller, and a paper discharge roller of a paper feed mechanism incorporated in an image forming apparatus such as an electrostatic copier, a laser beam printer, a plain paper facsimile, a composite apparatus thereof, or an ink jet printer, and further incorporated in a machine such as an Automated Teller Machine (ATM).
[ examples ] A method for producing a compound
The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples, and modifications and embodiments within the scope not departing from the gist of the present invention are included in the scope of the present invention.
[ evaluation method ]
(1) Hardness of
The hardness of the cured product of the rubber composition was measured in accordance with JIS K6253-3 (2012). Specifically, a sheet having a thickness of 2mm was prepared by pressing at 170 ℃ for 20 minutes using the rubber composition. In order to prevent the influence of the measurement substrate and the like, the hardness was measured using an automatic hardness meter (manufactured by polymer instruments) in a state where 3 sheets of the sheet were stacked. The detector used a type a durometer.
(2) Tensile strength and elongation at break
The tensile strength and elongation at break (elongation at break) of the cured product of the rubber composition were measured in accordance with JIS K6251 (2017). Specifically, a sheet having a thickness of 2mm was produced by pressing the rubber composition at 170 ℃ for 20 minutes, and a test piece was produced by punching the sheet into a dumbbell shape (dumbbell No. 3 shape, thickness of parallel portion of 2mm, initial inter-reticle distance of 20 mm). The physical properties were measured using a tensile test measuring apparatus (measurement temperature 23 ℃ C., tensile speed 500 mm/min). The tensile strength was then calculated by dividing the maximum tensile force recorded during the time when the test piece was pulled until it was cut by the cross-sectional area of the test piece before the test.
(3) Evaluation of rolls
< test paper >
Paper containing calcium carbonate: 70g/m 2 (ash content according to TGA analysis: about 15% by mass%, elemental analysis of ash content: almost all of Ca is elements other than oxygen).
Silica (silicate) -containing paper: 80g/m 2 (Ash = about 26 mass% according to TGA analysis, elemental analysis of the ash: si, the element other than oxygen, is the majority.
< determination of Friction coefficient >
As shown in fig. 2, a paper 11 (60 mm wide by 210mm long) is placed on a horizontally placed sheet 10 made of Polytetrafluoroethylene (PTFE). The roller body 2 of the paper feed roller 1 is placed on the paper 11, and a vertical load W1 (= 300 gf) is applied to the shaft 4, so that the roller body is pressed against the plate 10.
Next, the transport force F (gf) applied to the load cell (LOADCELL) 12 connected to one end of the paper 11 was measured while the roller main body 2 was rotated at 200rpm in the direction indicated by the arrow R1 of the one-dot chain line under the environment of the temperature of 23 ± 2 ℃ and the relative humidity of 55% ± 10%.
The initial friction coefficient μ was obtained from the measured transmission force F and the vertical load W1 (= 300 gf) by equation (1).
μ＝F(gf)/W1(gf) (1)
< simulation experiment of paper passing repeatedly >
As shown in fig. 3, a belt 14, which is made by connecting a sheet to be inspected (50 mm wide × 297mm long) in a loop shape, is wound between a roller main body 2 of a paper feed roller 1 and a metal driven roller 13 arranged in parallel with the paper feed roller 1. The roller body 2 with the tape 14 wound thereon is placed on a plate 15 made of Polytetrafluoroethylene (PTFE), and a vertical load W2 (= 500 gf) is applied to the shaft 4 so as to press the plate 15.
Next, in an environment of a temperature of 23 ± 2 ℃ and a relative humidity of 55% ± 10%, a simulated paper feeding operation was performed in which the roller main body 2 was rotated at 200rpm in the direction indicated by the arrow R1 of the alternate long and short dash line, and the belt 14 was conveyed in the direction indicated by the arrow of the broken line. The belt 14 is exchanged for a new belt every 10 minutes through the paper passing operation.
The friction coefficient μ of the roll was measured after 30 minutes and 60 minutes, calculated from the start of the paper feeding operation.
[ preparation of rubber composition ]
The respective raw materials were mixed by a kneader and an open roll mill so as to have the formulations shown in tables 1 and 2, to prepare rubber compositions. The measurement results of the cured products of the obtained rubber compositions are shown in tables 1 and 2.
[ TABLE 1 ]
[ TABLE 2 ]
The raw materials used in tables 1 and 2 are as follows.
Indene alkanol-based rubber 1: EPION (registered trademark) 301L (epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer (ethylene oxide content: 73 mol%; manufactured by Osaka SODA Co., ltd.)
Indene alkanol-based rubber 2: EPLCHL OMER (registered trademark) D (epichlorohydrin-ethylene oxide copolymer (ethylene oxide content: 61 mol%)
Indene alkanol-based rubber 3: hydrin (registered trademark) T3106 (epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer (ethylene oxide content: 56 mol%), manufactured by Nippon-Co., ltd.)
Indene alkanol-based rubber 4: EPLCHL OMERCG104 (epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer (ethylene oxide content: 35.5 mol%), manufactured by Osaka SODA Co., ltd.)
Indene alkanol-based rubber 5: hydrint1100 (epichlorohydrin-allyl glycidyl ether copolymer), manufactured by Nippon ruing Co., ltd.)
EPDM: "Esprene (registered trademark) 505A" (ethylene-propylene-ethylidene norbornene copolymer) manufactured by Sumitomo chemical Co., ltd
Carbon black: "SEAST (registered trademark) 3" manufactured by carbon corporation of east China sea "
Calcium carbonate: BF-300 manufactured by Beibei powdered Industrial Co Ltd "
Aluminum magnesium carbonate: DHT-4A-2, manufactured by Kyowa chemical industries, ltd
Magnesium oxide: kyowamag (registered trademark) 150, manufactured by Kyowa chemical industries, ltd
Calcium oxide: CLM #35 manufactured by Yonjiang chemical industries, ltd
A thiourea compound: accel (registered trademark) 22-S (ethylene thiourea), manufactured by Kaikou chemical industries, ltd
Vulcanization retarder 1: \12496\\124941248363 (registered trademark) R (4, 4' -dithiodimorpholine)
Triazine compound: zisnet (registered trademark) F (2, 4, 6-trimercapto-1, 3, 5-triazine) manufactured by Sankyo chemical Co., ltd
Vulcanization accelerator 1: nocceler (registered trademark) D (1, 3-diphenylguanidine), a product of chemical industries, ltd. Emerging in the interior
Vulcanization retarder 2: RETARDER CTP (N-cyclohexylthiophthalimide), manufactured by Toray corporation
Sulfur: 5% oil-extended sulfur manufactured by Hejian chemical industry Co., ltd
Vulcanization accelerator 2: nocceler TOT-N, a product of chemical industries, inc., of great interest
Vulcanization accelerator 3: nocceler DM, a product of chemical industry Co.Ltd, a new type in the interior
Acidifying zinc: 2 kinds of zinc oxide manufactured by Mitsui Metal mining Co., ltd
Stearic acid: stearic acid "Ailanthi" made by Nichiyao corporation "
[ production of paper feed roller ]
The rubber composition thus obtained was molded into a cylindrical shape by transfer molding under molding conditions of 170 ℃ for 30 minutes. A rod (outer diameter 12 mm) was pressed into a cylindrical molded article, and the molded article was polished with a cylindrical polishing machine so that the outer diameter of the rubber roller became 22mm and the width of the rubber roller portion was cut to 25mm to prepare a paper feed roller. The evaluation results of the obtained paper feed roller are shown in tables 1 and 2.
The rubber compositions Nos. 1 to 5 each contained (A) an epichlorohydrin-ethylene oxide copolymer or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer as a base rubber and (B) the thiourea compound as a crosslinking agent.
The rubber compositions Nos. 6 to 8 contained (A) an epichlorohydrin-ethylene oxide copolymer or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer as a base rubber and (B) a triazine compound as a crosslinking agent.
The paper feed rollers produced using these rubber compositions Nos. 1 to 8 had high initial friction coefficients for both calcium carbonate-containing paper and silica (silicate) -containing paper, and the decrease in friction coefficient after repeated paper passes was also suppressed. Therefore, it is considered that the transmission failure is suppressed even when used for a long time.
In particular, the reduction of the friction coefficient is further suppressed after the paper containing silica (silicate) is repeatedly passed through the paper by using the paper feed rollers manufactured by using the rubber compositions Nos. 1 to 3 and 6 to 7 in which the average content of the ethylene oxide component is 50% or more.
The rubber compositions nos. 9 and 10 do not contain (a) an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer as a base rubber.
The rubber compositions Nos. 11 and 12 do not contain the thiourea compound and/or the triazine compound (B) as the crosslinking agent.
The paper feed rollers manufactured using these rubber compositions nos. 9 to 12 had a high initial friction coefficient against silica (silicate) -containing paper, but the friction coefficient was greatly reduced after repeated paper passes. Therefore, it is considered that a conveyance failure occurs in a short time if these paper feed rollers are used.
The present invention (1) is a rubber composition for a paper feed roller, comprising (A) a base rubber comprising an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer, and (B) a vulcanizing agent comprising a thiourea compound and/or a triazine compound.
The present invention (2) is the rubber composition for a paper feed roller according to the present invention (1), wherein the epichlorohydrin-ethylene oxide copolymer and/or the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer has an ethylene oxide content of 50mol% or more.
The present invention (3) is the rubber composition for a paper feed roller according to the present invention (1) or (2), wherein the total content of the epichlorohydrin-ethylene oxide copolymer and/or the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer in the base rubber (a) is 85 mass% or more.
The present invention (4) is the rubber composition for a paper feed roller according to any one of the inventions (1) to (3), wherein the amount of the thiourea compound and/or the triazine compound is 0.1 to 10 parts by mass per 100 parts by mass of the base rubber (a).
The present invention (5) is a paper feed roller obtained by curing the rubber composition for a paper feed roller according to any one of the present invention (1) to (4).
Claims (7)
1. A rubber composition for a paper feed roller, characterized by comprising (A) a base rubber and (B) a vulcanizing agent,
the base rubber (A) contains an epichlorohydrin-ethylene oxide copolymer and/or an epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer,
the vulcanizing agent (B) contains a thiourea compound and/or a triazine compound.
2. A rubber composition for a paper feed roller according to claim 1, wherein the epichlorohydrin-ethylene oxide copolymer and/or the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer has an ethylene oxide content of 50mol% or more.
3. The rubber composition for a paper feed roller according to claim 1 or 2, wherein the total content of the epichlorohydrin-ethylene oxide copolymer and/or the epichlorohydrin-ethylene oxide-allyl glycidyl ether copolymer in the base rubber (A) is 85 mass% or more.
4. The rubber composition for a paper feeding roller according to claim 1 or 2, wherein the amount of the thiourea compound and/or the triazine compound is 0.1 to 10 parts by mass based on 100 parts by mass of the (a) base rubber.
5. The rubber composition for paper feeding rollers as claimed in claim 1 or 2, the thiourea compound is a compound represented by formula (1),
in the formula (1), R 1 ～R 4 Each independently represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an aryl group having 6 to 10 carbon atoms, R 2 And R 3 With or without bonding to each other.
6. The rubber composition for paper feeding roller according to claim 1 or 2, the triazine compound is a compound represented by formula (2),
in the formula (2), X 1 And X 2 Each independently represents a thiol group, -NR 11 R 12 Wherein R is 11 And R 12 Each independently represents an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 10 carbon atoms.
7. A paper feeding roller, characterized by the claim 1 ~ 6 any one of the rubber composition for paper feeding roller curing and get.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-168204 | 2021-10-13 | ||
| JP2021168204A JP2023058281A (en) | 2021-10-13 | 2021-10-13 | Rubber composition for paper feeding roller and paper feeding roller |
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| Publication Number | Publication Date |
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| CN115960452A true CN115960452A (en) | 2023-04-14 |
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| CN202210895187.0A Pending CN115960452A (en) | 2021-10-13 | 2022-07-26 | Rubber composition for paper feed roller and paper feed roller |
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| Country | Link |
|---|---|
| JP (1) | JP2023058281A (en) |
| CN (1) | CN115960452A (en) |
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