JP3398307B2 - Method of manufacturing sponge roller - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a sponge roller.
The present invention relates to a manufacturing method . More specifically, the present invention relates to an electronic copying machine and a laser beam printer (hereinafter referred to as LB).
A sponge suitable for a transfer roller, a charging roller, etc. installed around the photoconductor in an image forming apparatus such as P).
The present invention relates to a roller manufacturing method .

[0002]

2. Description of the Related Art In recent years, in electronic copying machines, LBPs, etc., charging and transfer in an image forming apparatus have been changed from a conventional wire corotron charger system to a roller system in order to achieve ozone-less contact with a photoconductor. A transfer roller that transfers an image on the photoconductor to a transfer material that passes through a contact portion with the photoconductor and a charging roller that contacts the photoconductor and charges the photoconductor are being adopted. Such a roller needs to have low hardness in order to obtain a high quality image, and sponge rubber is generally applied.

Methods for producing sponge type rollers are roughly classified into two types: an in-mold foaming method and a free foaming method.

The in-mold foaming method is a method of manufacturing a roller by forming a rubber composition containing a foaming agent around a core metal, placing the rubber composition in a mold cavity, and heating and foaming in the mold. Since a transfer cell, a charging roller, or the like requires a fine cell (bubble) diameter in order to stabilize electric resistance, a method for producing sponge rubber by an in-mold foaming method in which a fine cell is easily obtained. Is the mainstream. However, in the in-mold foaming method, rubber is usually charged to about 70 to 90% of the capacity of the mold cavity, but since it is difficult to adjust the amount to a predetermined amount, the sponge hardness after foaming varies. There was a point.

On the other hand, the free foaming method is further roughly classified into two types: a method of forming a rubber composition containing a foaming agent around a core metal, then heating and foaming to produce a roller, and a method of previously foaming. There is a method in which a rubber composition containing an agent is extruded into a hose shape by an extruder, heated and foamed to form a sponge rubber hose, and then a metal core is inserted to produce a roller. However, in the free foaming method, although foaming is possible without being restricted by the capacity in the cavity, it has a problem that the cell diameter of the sponge is large and the variation in cell diameter is large. This cell diameter is reduced when using an extruder with a vent (vacuum suction) at the time of extrusion, but among the means for forming an unvulcanized rubber layer on the outer periphery of the core metal, a crosshead is used at the time of extrusion. When the rubber is extruded, the core metal is extruded at the same time to form an unvulcanized rubber layer on the outer periphery of the core metal, so the load during extrusion is large, so the Mooney viscosity of the rubber compound is 25 (measurement condition: ML _{1+ It} is necessary to use a composition having a low viscosity of about ₄ ° C. or less (100 ° C.) or less, and when such a composition is used, there is a problem that the variation in cell diameter is not improved even if an extruder with a vent is used. .

[0006]

The present invention has been made in view of these points, and provides a sponge rubber having a fine and uniform cell diameter of, for example, 150 μm or less even in the free foaming method. Sponge low
The point is to provide a method for producing la .

[0007]

That is, the present invention provides a core
Manufacturing method of sponge roller having sponge layer around gold
The following (A) component and (B) on the outer periphery of the core
Containing components, the weight ratio of (A) / (B) is from 85/15 to
A rubber composition of 97/3 is placed and the rubber composition is added.
The present invention relates to a method for manufacturing a sponge roller for vulcanization and foaming.
It (A): Ethylene-propylene-non-conjugated diene copolymer
Rubber (B): Rubber having a double bond in the main chain

[0008]

[0009]

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The component (A) of the present invention is an ethylene-propylene-nonconjugated diene copolymer rubber (EPDM).
Is. As the non-conjugated diene, dicyclopentadiene, dicyclooctadiene, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4-
Hexadiene and the like are exemplified.

Specific grades of the ethylene-propylene-non-conjugated diene copolymer rubber include Mitsui EPT 0
045, 1035, 1045, 1060, 1070, 1
071, 3012P, 3045, 3042E, 3062
E, 3070, 3072E, 3090E, 8075E,
3091, 3095, 4010, 4021, 4045,
4070, 4095 (above, trade name of Mitsui Petrochemical Co., Ltd.), Esplen 201, 301, 305,
400, 501A, 502, 505, 505A, 512
F, 514F, 522, 524, 532, 552, 55
3, 567, 582F, 586, 600F, 601F,
606, 670F, 671F, 673, 5214, 57
54, 6506S, 6182F (above, trade name manufactured by Sumitomo Chemical Co., Ltd.), JSR EP912P, EP01
P, EP02P, EP941P, EP961SP, EP
07P, EP57P, EP181SP, EP11, EP
43, EP93, EP24, EP27, EP21, EP
132, EP22, EP25, EP33, EP35, E
P37C / F, EP65, EP51, EP57C / F,
EP75F, EP86, EP96, EP98, EP10
3AF, EP106EF, EP107F, EP801
E, EP001DE (above, manufactured by Japan Synthetic Rubber Co., Ltd.
Trade name), Keltan 520, 720, 820, 31
2, 512, 712, 812, 314, 514, 71
4, 378, 578, 778, 4502, 4802, 4
778, 4703, 4903, 5631A, 512 x 5
0,708 × 15,509 × 100 (above, trade name of Idemitsu DSM Co., Ltd.), NORDEL 104
0, 1070, 1145, 1320, 1440, 147
0, 1660, 2522, 2722 / P, 2744 /
P, 2760 / P (above, DuPont (DuPont)
(US) product name), Epsin 40-A,
70-A, 55, 2308, 2506, 4506, 49
06, 5206, 5508, 5805, 7506, E8
01, N557, N597, N997, P557, P5
58, P597, MDE239, MDE248 (above,
Copolymer Rubber & Chemical Corporation (Copolymer Rubber & Chem)
made by ical Corporation (USA)
(Trade name), POLYSAR 227, 306, 345,
585, 487XP, 865, 965, 5465, 56
72X, 5875, 6463 (above, Polysar Rubber Corporation
Corporation) (trade name, manufactured by USA) and the like.

In the present invention, one type of ethylene-propylene-non-conjugated diene copolymer rubber may be used alone, or for the purpose of adjusting Mooney viscosity, propylene content, oil-extended oil amount, vulcanization rate and the like. Two or more kinds may be appropriately blended and used.

The component (B) of the present invention is a rubber having a double bond in the main chain, and specific examples include NR (natural rubber), SBR (styrene-butadiene copolymer rubber),
NBR (nitrile rubber), IR (isoprene rubber), C
Examples thereof include R (chloroprene rubber), BR (polybutadiene rubber), IIR (butyl rubber), and the like, and a styrene-butadiene copolymer rubber is preferable from the viewpoint of kneading processing stability.

The styrene-butadiene copolymer rubber is a random copolymer rubber of styrene and butadiene, which is mainly produced by an emulsion polymerization method, but a rubber by a solution polymerization method is also available.

Since there are many kinds of styrene-butadiene copolymer rubber, a code number is set to unify the kinds. 1500, 1502, 1507, 17
07, 1708, 1712, 1778, 1778N, 1
Examples include 778J and 1778S. As manufacturing companies, Sumitomo Chemical Co., Ltd., Nippon Synthetic Rubber Co., Ltd.,
Asahi Kasei Kogyo Co., Ltd., Nippon Zeon Co., Ltd. and the like are exemplified.

The proportion of (A) and (B) in the rubber composition of the present invention is 85/15 to 97 / in terms of the weight ratio of (A) / (B).
3, and preferably 90/10 to 95/5.
When the amount of (A) is too small (the amount of (B) is too large), foaming becomes difficult, while when the amount of (A) is too large (the amount of (B) is too small), the foamed cell diameter becomes too large.

For vulcanization (crosslinking) of the rubber composition of the present invention,
Conventional sulfur vulcanization systems can be applied. Sulfur used for sulfur vulcanization is added in an amount of about 5 parts by weight or less based on 100 parts by weight of the total amount of (A) and (B).
As this sulfur, fine powder obtained by crushing recovered sulfur is used.
h, 200 mesh, 300 mesh, 325 mesh
(These are trade names of Tsurumi Chemical Industry Co., Ltd.). In addition, surface-treated sulfur with improved dispersibility and the like is also appropriately used. For this, Sulfax A, 200S, M
C, PS, PMC (above, trade name by Tsurumi Chemical Industry Co., Ltd.) and the like are exemplified. In order to avoid bloom from unvulcanized rubber, insoluble sulfur is used. For this, Seimi Sulfur (trade name of Nippon Dry Storage Industry Co., Ltd.), Sanfer, Sunfer 90 (above, Sanshin Chemical Industry Co., Ltd.) Product name) is exemplified.

When low compression set is required, sulfur-containing organic compounds are used as vulcanizing agents (crosslinking agents) instead of sulfur at all. Chemical Industry Co., Ltd. product name) morpholine disulfide, Axel TMT (Kawaguchi Chemical Co., Ltd. product name) Tetramethylthiuram disulphide, Axel TET (Kawaguchi Chemical Co., Ltd. product name) Tetraethyl Thi Raum disulphide, Axel TRA (Kawaguchi Chemical Co., Ltd. product name)
Examples thereof include dipentamethylene thiuram tetrasulfide and the like, and about 0.5 to 5 parts by weight is added to 100 parts by weight of the total amount of (A) and (B).

Usually, in sulfur vulcanization, in order to improve the properties of the vulcanizate, particularly compression set and processing stability, 3 to 8 is used.
About 0.5 to 3 parts by weight of vulcanization accelerators are added together for 100 parts by weight of the total amount of (A) and (B). Examples thereof include thiazoles, thioureas, thyriums, dithiocarbamates and guanidines. The thiazoles include 2-mercaptobenzothiazole such as Axel M (trade name of Kawaguchi Chemical Industry Co., Ltd.), dibenzothiazole disulfide such as Axel DM (trade name of Kawaguchi Chemical Industry Co., Ltd.), and Accel CZ (Kawaguchi Chemical Industry Co., Ltd.). Product name made by corporation)
Such as N-cyclohexylbenzothiazole, N-oxydiethylene-2-benzothiazole sulfenamide such as Axel NS (Kawaguchi Chemical Co., Ltd. product name), Axel BNS-R (Kawaguchi Chemical Co., Ltd. product name) Such as N-t-butyl-2-benzothiazole sulfenamide, N, N-dicyclohexyl-2 such as Axel DZ-G (trade name, manufactured by Kawaguchi Chemical Industry Co., Ltd.)
Examples thereof include benzothiazole sulfenamide. Examples of thioureas include diethyl thiourea such as Axel EUR (trade name of Kawaguchi Chemical Industry Co., Ltd.),
Examples include ethylene thiourea such as Axel 22-S (trade name, manufactured by Kawaguchi Chemical Industry Co., Ltd.). Axel TMT (produced by Kawaguchi Chemical Industry Co., Ltd.)
(Trade name) such as tetramethylthiuram disulfide,
Tetraethyl thiuram disulphide such as Axel TET (Kawaguchi Chemical Co., Ltd. product name), Axel T
Tetrabutyl thiuram disulfide such as BT (Kawaguchi Chemical Co., Ltd.), dipentamethylene thiuram tetrasulfide such as Axel TRA (Kawaguchi Chemical Co., Ltd.), Accel TS (Kawaguchi Chemical Co., Ltd. product) Examples thereof include tetramethylthiuram monosulfide and the like. Examples of dithiocarbamate salts include zinc dimethyldithiocarbamate such as Axel PZ (trade name manufactured by Kawaguchi Chemical Industry Co., Ltd.), zinc diethyldithiocarbamate such as Axel EZ (trade name manufactured by Kawaguchi Chemical Industry Co., Ltd.), and accelerator BZ (Kawaguchi Chemical Industry Co., Ltd.). Examples thereof include zinc dibutyldithiocarbamate (trade name, manufactured by Co., Ltd.), tellurium dithiocarbamate (trade name, manufactured by Axel TL-PT (trade name, manufactured by Kawaguchi Chemical Industry Co., Ltd.), and the like. Examples of guanidines include diphenylguanidine such as Axel D (trade name, manufactured by Kawaguchi Chemical Industry Co., Ltd.).

As the foaming agent for the rubber composition of the present invention, a foaming agent which is commonly used for ethylene-propylene-non-conjugated diene copolymer rubber can be applied, and examples thereof include azodicarbonamide and azobisisobutyro. Examples thereof include nitrile, dinitrosopentamethylenetetramine, 4,4′-oxybis (benzenesulfonylhydrazide), etc., and 1 to 10 parts by weight is added to 100 parts by weight of the total amount of (A) and (B). Further, if necessary, a decomposition aid, for example, an inorganic salt such as zinc oxide or tribasic lead sulfate, a metallic soap such as zinc stearate or lead stearate, or a urea compound is contained in the total amount of (A) and (B). 1-1 for 100 parts by weight
About 0 parts by weight is used together.

In the rubber composition of the present invention, in order to obtain a composition having a low hardness, and to aid the mixing / dispersion of the compounding agent, the molding work such as rolling and extrusion is facilitated, and the tackiness of the unvulcanized rubber is increased. In order to facilitate molding, a softening agent of 180 parts by weight or less, preferably about 10 to 60 parts by weight, is filled with respect to 100 parts by weight of (A).

It is necessary to consider the compatibility of the softening agent with the ethylene-propylene-non-conjugated diene copolymer rubber. For that purpose, it is necessary to use paraffin oil, naphthene oil, aromatic oil or the like. It is good.

As a softening agent for paraffinic oil, Diana Process Oil PW-32, PW-90, PW-
150, PW-380, PS-32, PS-90, PS
-430, PX-32, PX-90 (above, product name manufactured by Idemitsu Kosan Co., Ltd.), Flexon 845 (above, product name manufactured by Esso Oil Co., Ltd.), SYNTAC PA-95, P
A-100, PA-140 (above, trade name of Kobe Oil Chemicals Co., Ltd.), Cosmo Process 10, 40, 40C
(These are product names of Cosmo Oil Co., Ltd.), Sunper 110, 115, 120, 130, 1
50, 180, 2100, 2210, 2280 (above,
Nippon Sun Oil Co., Ltd. product name), Fukkor P-2
00, P-400, P-500 (above, product name by Fuji Kosan Co., Ltd.), Mitsubishi 10, Mitsubishi 12 (above, product name by Mitsubishi Petroleum Co., Ltd.) and the like.

As the softening agent for the naphthenic oil,
Diana Process Oil NS-24, NS-100, N
M-26, NM-68, NM-150, NM-280,
NP-24, NU-80, NF-90 (above, trade name of Idemitsu Kosan Co., Ltd.), Esso Process Oil 725,
765 (above, trade name by Esso Oil Co., Ltd.), SYNTAC N-40, N-60, N-70, N-75, N-
85 (above, trade name of Kobe Oil Chemicals Co., Ltd.), Shelf Rex 371JY, 371N, 451, N-4
0, 22, 22R, 32R, 100R, 100S, 10
0SA, 220RS, 220S, 260, 320R, 6
80 (above, trade name of Shell Japan Co., Ltd.), Sunthene 310, 380, 410, 4
15, 420, 430, 450, 480, 3215, 4
130, 4240, CiroLight R.A. P. O.
(Above, product name manufactured by Nippon San Oil Co., Ltd.), Koumorex No. 2 (product name manufactured by Nippon Oil Co., Ltd.), Fuccol 1150N, 1400N (above, product name manufactured by Fuji Kosan Co., Ltd.), Mitsubishi 20 (Mitsubishi Oil Corporation) Product name),
Naplex 32, 38 (above, trade name by Mobil Oil Co., Ltd.), Petrex PN-3 (trade name by Yamabun Petrochemical Co., Ltd.) and the like are exemplified.

As the softening agent for the aromatic oil, Diana Process Oil AC-12, AC-460, AE-
24, AE-50, AE-200, AH-16, AH-
58 (above, trade name manufactured by Idemitsu Kosan Co., Ltd.), Esso Process Oil 110, 120 (above, trade name manufactured by Esso Oil Co., Ltd.), SYNTAC HA-10, HA-15,
HA-30, HA-35 (above, trade name of Kobe Oil Chemicals Co., Ltd.), Cosmo Process 40A (trade name of Cosmo Oil Co., Ltd.) JSO Aroma790 (trade name of Nippon Sun Oil Co., Ltd.), Koumorex 300,
700 (above, product name of Nippon Oil Co., Ltd.), Aromax # 1, # 3, # 5 (above, made by Fuji Kosan Co., Ltd.
Trade name), Heavy process oil Mitsubishi 34, Mitsubishi 38, Mitsubishi 44 (above, product name of Mitsubishi Oil Co., Ltd.), Mobilsol K, 22, 30, 130 (above, product name of Mobil Oil Co., Ltd.), Petrex LPO-R, L
PO-V, PF-1, PF-2 (above, a brand name by Yamabun Petrochemical Co., Ltd.) etc. are illustrated.

DOP (manufactured by Daihachi Chemical Industry Co., Ltd.)
(Trade name) and Vinizerizer 80 (trade name, manufactured by Kao Corporation) such as di- (2-ethylhexyl) phthalate (D
OP), high-grade alcohol / phthalate such as Leoflex 9P (trade name of Shell Japan Co., Ltd.) and Diasizer 11, 99 (above, trade name of Mitsubishi Chemical Co., Ltd.), DIOP (Wacker-Wacker-
Chemie) (Germany) brand name) diisooctyl phthalate (DIOP), Sanso Sizer D
OS such as OS (trade name of New Japan Rika Co., Ltd.)-(2
-Ethylhexyl) sebacate, Alizona208
Isooctyl tall oil fatty acid ester such as (trade name of Arizona Chem (USA)), tributyl phosphate (TBP) such as TBP (trade name of Daihachi Chemical Industry Co., Ltd.), T
Tributoxyethyl phosphate (TBEP) such as BEP (trade name manufactured by Daihachi Chemical Industry Co., Ltd.), tricresyl phosphate (TCP) such as Sanso Sizer TCP (trade name manufactured by Shin Nippon Rika Co., Ltd.), CDP
Cresiles such as (Daihachi Chemical Industry Co., Ltd. product name)
Diphenicle Phosphate (CDP), Korea
diphenylalkane such as ol CE 5422 (trade name of BASF (Germany)), Thiocol TP-
95 (Morton International
It is also possible to use di (butoxyethoxyethyl) adipate such as International (trademark of USA).

The above-mentioned softening agents are usually used in an appropriate amount of 1 to 2 and if necessary, different types of oils such as blending naphthenic oil and paraffinic oil may be added together. In consideration of the polishing property of the surface of the sponge rubber layer when used as a roller, black sub, white sub, candy sub, golden factice, neo factice, sulfur-free factice (above, product name of Tenma Sub Chemical Co., Ltd.) Such sub (factice) can also be used in an amount of about 5 to 50 parts by weight per 100 parts by weight of the total amount of (A) and (B).

In the present invention, the total amount of (A) and (B) is 1
The filler is usually added in an amount of 10 to 150 parts by weight, preferably 20 to 100 parts by weight, based on 00 parts by weight.

As the silica type filler, Aerosil 130, 200, 300, 380, R972, R974.
(Above, product name manufactured by Nippon Aerosil Co., Ltd.) and dry silica such as Reorosil QS13, QS30, QS38, QS102 (product name manufactured by Tokuyama Co., Ltd.),
Carplex # 67, # 80, # 100, # 112
0, XR, 22S, CS-5, CS-7 (above, trade name of Shionogi Pharmaceutical Co., Ltd.) and Shilton A, R-2 (above, trade name of Mizusawa Chemical Industry Co., Ltd.) and Tokushiru A
L-1, Gu, U, UR, US (above, trade name of Tokuyama Corporation) and nip seals AQ, ER, LP, N
A, NP, NS-K, VN3 (all trade names manufactured by Nippon Silica Co., Ltd.), Ultrasil VN3 (trade name manufactured by Degussa (Germany) Co., Ltd.) and Hi-
Sil233 (PPG Industries (USA))
Wet silica such as (trade name) is exemplified.

Carbon black and white luster CC, D
Activated calcium carbonate such as D, O, U (above, product name manufactured by Shiroishi Industry Co., Ltd.), special calcium carbonate such as Shiragana A, AA (above, product name manufactured by Shiroishi Industry Co., Ltd.),
Magnesium silicate such as Mistron Paper (trade name of Nippon Mistron Co., Ltd.), Hytron, Hytron A, Microlite, US-100, US-15
0S, US-150SS, Hirac, Hirac SS
(Above, Takehara Chemical Industry Co., Ltd. product name) magnesium silicate, Wiener clay A (hard clay:
Kawashige Co., Ltd. product name), hard top clay, soft clay, crown clay (above, Shiraishi Calcium Co., Ltd. product name), silcanite, NN clay, special kaolin clay, hard bright, No. 5 clay, S
PMA Clay, Union Clay RC-1, Gromax Max LL, Hydrite PX (Takehara Chemical Industry Co., Ltd. product name), JP-100 Kaolin, 5M Kaolin,
Clay (aluminum silicate) such as NN Kaolin, Hardsil, ST Kaolin, Cartabo (above, trade name of Tsuchiya Kaolin Industry Co., Ltd.), ST-100, ST-
200, ST-301 (above, product name manufactured by Shiraishi Calcium Co., Ltd.), Nurok321, Nucap100,
Nucap190, Nucap200, Nucap39
0 (above, JM Hub
er) (American) brand name) and Burgess
A silane-modified clay such as KE, CB, 5178, 2211 (above, trade name of Burgess Pigment (USA)) may be used in combination as needed.

In the rubber composition of the present invention, for the purpose of dimensional stability and low cost, if necessary, about 10 to 100 parts by weight based on 100 parts by weight of the total amount of (A) and (B). You may add the extended filler of.

As the above-mentioned extended filler, Green B is used.
all (trade name of Inoue Lime Industry Co., Ltd.) and Tamapearl TP-121, TP-121R, TP222H, TP-
222HS, TP-123, TP-123CS (above,
Light calcium carbonate such as Okutama Kogyo Co., Ltd.) and Silver W (Shiroishi Kogyo Co., Ltd.), Whitelon SSB, SB, S (above, Shiroishi Calcium Co., Ltd. trade name) and Sunlight # 100, # 300,
# 700, # 800, # 1000, # 1500, # 20
00, # 2200, # 2500 (above, trade name of Takehara Chemical Industry Co., Ltd.) and NS # 100, NS # 200, N
S # 400, NS # 600, NS # 1000, NS # 2
300, NS # 2500, NS # 2700, NS # 30
00, SS # 30, SS # 80, NN # 200, NN #
500 (above, product name manufactured by Nitto Koka Kogyo Co., Ltd.) and Super S, SS, SSS, 4S, # 1500, # 170
0, # 2000 (above, trade name manufactured by Maruo Calcium Co., Ltd.), heavy calcium carbonate, JET-S (trade name manufactured by Asada Milling Co., Ltd.), talc GTA, CTA1, C
TA2, fine powder talc (above, Kunimine Industry Co., Ltd.
Product name), MS, MS-P, MS-A, ND, SW, S
Talc (talc) such as WE, SWA, SWB, SSS, SS, S (above, trade name of Nippon Talc Co., Ltd.),
Crystallite AA, VX-S, VX-S-2, VX-
SR (above, product name made by Tatsumori Co., Ltd.) and Min-U-
Sil 5, 10, 15, 30 (above, product name of US Silica (US) company) and Imsil A-10, A-15, A-25, A
-108 (above, Illinois Minerals (Illino
(is Minerals) (USA) product name)
Such as quartz powder, JA-30W, 325M (above, product name manufactured by Asada Flour Milling Co., Ltd.) and NYAD325, 400, 1
Wollastonite (calcium metasilicate) such as 250, G (above, trade name manufactured by NYCO (USA)), Celite 270, 281, 501, 5
03, 505, 535, 545, 560, 577, F
C, SSC, Super Floss, Now Fl
oss (above, Johns-Manville (Johns-Ma
nville) (trade name of U.S.A.) and radio lights # 100, # 200, # 300, # 500, # 50.
0S, # 600, # 700, # 800, # 800-S,
Diatomaceous earth such as # 900, F, SPF, Fine Flow A, Fine Flow B (above, trade name manufactured by Showa Chemical Industry Co., Ltd.), Zinc oxide such as zinc white 2 (trade name manufactured by Sakai Chemical Industry Co., Ltd.) , Aluminum sulphate, barium sulphate, calcium sulphate, titanium oxide, molybdenum difluoride, etc. are usually used in combination with one or several types together with a reinforcing filler.

Since the rubber composition of the present invention is required to have semiconductivity when applied to a transfer roller or the like, a conductivity imparting agent such as acetylene black (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd.) is used if necessary. , Continex CF, SC
F (above, product name made by Continental Carbon (US)), Vulcan C, SC (above product name made by Cabot (US)), Ketjen Black EC-600JD
(Ketjen Black International (Netherlands)
Product name), Asahi HS-500 (product name of Asahi Carbon Co., Ltd.), Toka Black # 4500, # 5500
(Above, product name manufactured by Tokai Carbon Co., Ltd.), conductive zinc oxide 23-K (product name manufactured by Shiramizu Chemical Co., Ltd.), conductive zinc oxide 1 (product name manufactured by Honjo Chemical Co., Ltd.) Conductive zinc oxide, such as
Antistatic calcium carbonate such as EC-1 and EC-5 (trade names manufactured by Maruo Calcium), conductive tin oxide doped with antimony oxide such as T-1 (trade name manufactured by Mitsubishi Materials Corporation), WP Conductive titanium oxide doped with antimony oxide such as (trade name of Mitsubishi Materials Co., Ltd.) is 3 to 150 parts by weight with respect to the total amount of 100 parts by weight of (A) and (B), depending on the type. It is added in a timely manner.

In the rubber composition of the present invention, in order to improve the rubber kneading property and extrudability, 0.3 to 5 is added, if necessary, to 100 parts by weight of the total amount of (A) and (B). About 1 part by weight of lubricant or internal release agent can be added, but addition of too much causes bloom, bleeding, fusion failure, etc., but it depends on the type, but usually about 0.5 to 1 part by weight. Is added.

As the above-mentioned lubricant and internal release agent, Mitsui High Wax 100P, 110P, 200P, 210P, 2
Low molecular weight polyethylene such as 20P, 320P, 420P (above, trade name manufactured by Mitsui Petrochemical Co., Ltd.), LUNAC S-20, S-30, S-40 (above, trade name manufactured by Kao Corporation) and FA-KR. (Trade name of Nippon Oil & Fats Co., Ltd.) and ADEKA fatty acid SA-20, SA-300, SA-
Stearic acid such as 400 (above, product name manufactured by Asahi Denka Co., Ltd.), plastrosin, plastrosin S (above,
Fatty acid amides such as Fujisawa Pharmaceutical Co., Ltd. (trade name), fatty acid nitrogen derivatives such as Armowax EBS (Lion Akzo Co., Ltd.), Aflex42
(Rein Chemi (Germany)
A mixture of a polar compound and a surfactant, such as the trade name of the company, Struktol A60 (Schill & Seilacher)
Higher unsaturated fatty acid zinc such as (Germany) brand name, Struktol EF44 (Schill & Seilachche
r) Special fatty acid zinc such as (Germany) trade name,
Struktol WB16 (Still & Seilacher)
A mixture of fatty acid calcium and fatty acid amide, such as (Germany) (trade name), Struktol WB42 (Schill & Seii
a mixture of a fatty acid ester and a fatty acid metal salt, such as Llcher (Germany), Struktol
WB212 (Seal and Zylaker (Schi
ll & Seilacher (Germany trade name), a mixture of higher fatty acid ester hydrates and an inorganic carrier, Struktol WB222 (Schill & Seillac).
a polyhydric alcohol fatty acid ester such as Her (trademark of Germany), Struktol WS180 (Schill & Seii)
organic silicone condensate such as Llcher (Germany), Struktol W33FL (Seal & Seylaker)
Illacher) (Germany) is a mixture of high molecular weight natural aliphatic alcohol and aliphatic soap treated with an inert filler, paraffin wax, montan wax and the like.

[0036]

【Example】

Example 1 Next, more specific examples of the roller according to the present invention will be shown below, but the present invention is not limited thereto.

First, as the ethylene-propylene-non-conjugated diene copolymer rubber (EPDM) which is the component (A),
85 parts by weight of Sumitomo E5754 (trade name of Sumitomo Chemical Co., Ltd.), 15 parts by weight of SBR1502 (trade name of Sumitomo Chemical Co., Ltd.) as a styrene-butadiene copolymer rubber (SBR) as the component (B), 70 parts by weight of carbon black Seast SO (trade name, manufactured by Tokai Carbon Co., Ltd.) as a filler and N which is calcium carbonate
40 S # 100 (product name manufactured by Nitto Koka Kogyo Co., Ltd.)
Parts by weight, Diana Process Oil PW3 as a softening agent
50 parts by weight of 80 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), 5 parts by weight of Vesta 18 (trade name, manufactured by Inoue Lime Industry Co., Ltd.), which is a calcium oxide as a dehydrating agent, and two kinds of zinc oxide as zinc oxide (Sakai Chemical Industry Co., Ltd.) 5 parts by weight of Kogyo Co., Ltd., 1 part by weight of Lunac S-20 (trade name of Kao Co.) as stearic acid, and azodicarbonamide as a foaming agent (Cermic C-1: Sankyo Kasei Co., Ltd.) 7 parts by weight of product name), 1.0 part by weight of 325mesh as fine vulcanizing agent, 325 mesh of Jinhua fine powder sulfur, and 1.0% of accelerator CZ (product name of Kawaguchi Chemical Industry Co., Ltd.) as vulcanization accelerator.
0.5 parts by weight of Accel DM (Kawaguchi Chemical Co., Ltd.) and 0.5 parts by weight of Accel M (Kawaguchi Chemical Co., Ltd.) and Accel TRA (Kawaguchi Chemical Co., Ltd.) 0.6 parts by weight of product name) and 0.5 parts by weight of Accel TMT (product name of Kawaguchi Chemical Industry Co., Ltd.) are weighed and kneaded with a well-known rubber kneading roll to be used for an unvulcanized roller. A rubber composition was obtained. That is,
The total composition of EPDM and SBR is 100 parts by weight, and the composition contains 7 parts by weight of the foaming agent.

Then, in order to evaluate the performance, JIS K 6
According to 300, Mooney viscosity was measured at 100 ° C. Next, the outer diameter of the sponge rubber composition for rollers of this example was adjusted to 8 by using a crosshead with a vented extruder.
An unvulcanized rubber layer was formed on the outer periphery of the cored bar by extruding together with the cored bar having a diameter of mmφ and a total length of the rubber portion of 320 mm. Next, this cored bar was put into a continuous furnace at 180 ° C., heated, vulcanized, and foamed to manufacture a sponge rubber roller.

Next, after polishing the sponge roller to have an outer diameter of 24 mm, an Asker C hardness tester (a hardness tester for sponge rubber specified by SRIS (Japan Rubber Association Standard) 0101 expansion rubber test method ( The sponge hardness was measured by Kobunshi Keiki Co., Ltd. product name). Next, after the sponge layer of the sponge roller was sliced in the circumferential direction to have a width of 2 mm, the vicinity of the center of the sponge layer portion having a thickness of 8 mm was photographed with a scanning electron microscope at a magnification of 40 times, and was photographed. The average cell diameter of each sample was determined from the cell size.

Example 2 Except that the EPDM of Example 1 was changed to 90 parts by weight of Esprene E5754 (trade name of Sumitomo Chemical Co., Ltd.) and the amount of SBR1502 added was changed from 15 parts by weight to 10 parts by weight. The same procedure as in Example 1 was performed.

Example 3 Except that the EPDM of Example 1 was changed to 93 parts by weight of Esprene E5754 (trade name, manufactured by Sumitomo Chemical Co., Ltd.) and the amount of SBR1502 added was changed from 15 parts by weight to 7 parts by weight. The same procedure as in Example 1 was performed.

Example 4 Except that the EPDM of Example 1 was changed to Esprane E5754 (trade name of Sumitomo Chemical Co., Ltd.) by 95 parts by weight and the amount of SBR1502 added was changed from 15 parts by weight to 5 parts by weight. The same procedure as in Example 1 was performed.

Example 5 EPDM of Example was changed to 93 parts by weight of Esplen E5754 (trade name of Sumitomo Chemical Co., Ltd.) and
Example 1 was repeated except that the amount of SBR1502 added was changed from 15 parts by weight to 3 parts by weight.

Comparative Example 1 For comparison with Example 1, the amount of Esprene EP 5754 added as EPDM of Example 1 was 85 parts by weight to 10 parts by weight.
The same procedure as in Example 1 was carried out except that the amount of SBR1502 was changed to 0 parts by weight.

Comparative Example 2 For comparison with Example 1, the amount of Espren 5754 added as EPDM of Example 1 was changed from 85 parts by weight to 80 parts by weight, and the amount of SBR1502 added was changed from 15 parts by weight to 20 parts by weight. The same procedure as in Example 1 was repeated except that the weight part was changed.

The compounding ratios (composition compounding) of each Example and Comparative Example and the evaluation results are shown in Tables 1 and 2 below.

From the evaluation results shown in Table 1, the sponge rollers using the rubber compositions of Examples 1 to 5 have a low sponge hardness and a fine cell diameter of 150 μm or less in average cell diameter. It turned out that This SBR
The reason why the cell diameter is improved by adding a small amount of is not clear, but since the vulcanization rate of the base rubbers EPDM and SBR are different and the vulcanization rate of SBR is high, the composition is heated and foamed. It is presumed that SBR may be vulcanized first and internal pressure may be applied during the process. Furthermore,
The sponge roller using the rubber composition of Comparative Example 1 was found to be unsuitable as a sponge roller such as a transfer roller due to its coarse cell diameter. Further, in the sponge roller using the rubber composition of Comparative Example 2, S
It was found that the amount of BR added was too large to cause vulcanization and foaming, so that it could not be used for practical use.

[0048]

[Table 1]

[0049]

[Table 2]

EPDM: Esplen E5754 manufactured by Sumitomo Chemical Co., Ltd. EPDM (Moonie viscosity 30 (M
L1 _{+ 4} 100 ° C)) SBR: SBR1502 (Sumitomo Chemical Co., Ltd.)
Trade name) ○ In addition to the composition shown in the table, the following was used as a common composition: Stearic acid: LUNAC S-20 (manufactured by Kao Corporation)
Trade name) 1 part by weight Zinc oxide: Two types of zinc oxide (Product name by Sakai Chemical Industry Co., Ltd.) 5 parts by weight FEF Carbon: Seast SO (Product name by Tokai Carbon Co., Ltd.) 70 parts by weight Calcium carbonate: NS # 100 (product name manufactured by Nitto Koka Kogyo Co., Ltd.) 40 parts by weight Softener: Diana Process Oil PW380 (product name manufactured by Idemitsu Kosan Co., Ltd.) 50 parts by weight Calcium oxide: Vesta 18 (product manufactured by Inoue Lime Industry Co., Ltd.) Name) 5 parts by weight Axel CZ: N-cyclohexylbenzothiazole manufactured by Kawaguchi Chemical Industry Co., Ltd. product name) 1.0 parts by weight Axel DM: dibenzothiazole disulfide manufactured by Kawaguchi Chemical Industry Co., Ltd. product name) 0.5 Parts by weight Axel M: 2-mercaptobenzothiazole manufactured by Kawaguchi Chemical Industry Co., Ltd. 0.5 part by weight Axel TR A: dibenzomethylene thiuram tetrasulfide manufactured by Kawaguchi Chemical Co., Ltd., trade name 0.6
Weight part-Axel TMT: Tetramethyl thiuram disulfide manufactured by Kawaguchi Chemical Industry Co., Ltd. 0.5 part by weight-Sulfur: Jinhua fine powder sulfur 325 mesh (Tsurumi Chemical Industry Co., Ltd. product name) 1.0 part-foaming Agent A. D. C. A (azodicarbonamide): Cermic C-1 (trade name of Sankyo Kasei Co., Ltd.)
7.0 parts by weight

[0051]

As described above, according to the present invention, the average cell diameter is, for example, 150 μm even in the free foaming method.
It was possible to provide a method for producing a sponge roller capable of providing the following fine and uniform sponge rubber having a cell diameter.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of an embodiment of a sponge roller using a rubber composition for a roller according to the present invention.

[Explanation of symbols]

1 Sponge roller 2 core metal 3 Sponge rubber layer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yukiko Takao, Inquiry Yukio Takao, 3-30-1 Horikiri, Katsushika-ku, Tokyo Inside Arai Seisakusho Co., Ltd. (56) Fields investigated (Int.Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08 C08J 9/06 G03G 15/02

Claims (2)

(57) [Claims] 1. A method of manufacturing a sponge roller having a sponge layer on the outer periphery of a core metal , comprising:
Containing (A) component and (B) component,
Arrange a rubber composition having a weight ratio of 85/15 to 97/3
The sponge roller for vulcanizing and foaming the rubber composition.
Build method. (A): Ethylene-propylene-non-conjugated diene copolymer
Rubber (B): Rubber having a double bond in the main chain Wherein component (B) is a styrene - The process according to claim 1, wherein the butadiene copolymer rubber.