JPH10114896A - Sliding member, slide bearing device and developing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the sliding resistance and thereby reduce the driving torque as a plain bearing device. SOLUTION: This is a sliding member formed of a molded article of a resin composition, wherein the resin composition contains at least a synthetic resin, a polyolefin and an oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding member, and more particularly, to a sliding member made of resin and a sliding bearing device and a developing device using the same.

[0002]

2. Description of the Related Art Electrophotographic copying machines, printers, facsimile machines, and the like are required to be small, lightweight, easy to use, and low in cost. At the same time, development of a developing device incorporated in these devices, for example, is becoming easy to use, small and light, and a removable process cartridge is being developed. As a bearing device at a sliding portion of such a developing device, an oil-impregnated sintered plain bearing device, a resin plain bearing device, and the like are frequently used in place of the rolling bearing device. Above all, resin-made sliding bearing devices, which have less change in sliding characteristics with respect to temperature changes than oil-impregnated sintered plain bearing devices, are frequently used.

[0003] A conventional resin sliding bearing device employs an oil-impregnated resin sliding member in which synthetic resin is impregnated with lubricating oil or a resin sliding member in which synthetic resin is mixed with a lubricating component. The example used is general. For example, as an oil-impregnated resin sliding member, a member in which lubricating oil is dispersed and held in a synthetic resin such as polyphenylene sulfide or polyacetal is known. Further, as a resin sliding member, a material in which polytetrafluoroethylene, modified polyethylene, or the like is blended with a synthetic resin is known. For example, there is known an aromatic polyamide resin composition for sliding parts in which a modified polyethylene is blended with an aromatic polyamide (JP-A-3-285952). Among these resin-made sliding bearing devices, a sliding bearing device using an oil-impregnated resin sliding member for a bearing portion is frequently used as a bearing device having excellent sliding characteristics.

[0004]

However, conventional sliding members, especially oil-impregnated resin plain bearing devices, have a problem that the sliding resistance tends to increase with time. That is,
In conventional oil-impregnated resin plain bearings, since lubricating oil is often held in a capsule-like form within the oil-impregnated resin,
Only the oil on the resin surface layer contributes to the lubrication, and the oil inside the resin does not contribute to the lubrication. As a result, there is a problem that the amount of oil in the resin surface layer becomes extremely small, the lubricating properties deteriorate, and in some cases, seizure may occur.

In particular, bearings provided at both shaft ends, such as a developer carrying member constituting a developing device and a photosensitive roller serving as a latent image holding member, cause rotational unevenness when the sliding resistance fluctuates with time. However, there is a problem that it is difficult to form a good image. If the driving torque is increased by using a larger motor to prevent rotation unevenness, there is a problem that it is difficult to reduce the size and weight and reduce the cost.

SUMMARY OF THE INVENTION The present invention has been made to address such a problem, and a resin sliding member, a sliding bearing device, and a device using the sliding bearing device capable of reducing sliding resistance. It is an object of the present invention to provide a developing device capable of reducing the entire driving torque.

[0007]

The sliding member according to claim 1 is
A sliding member comprising a molded product of a resin composition, wherein the resin composition contains at least a synthetic resin, a polyolefin resin, and an oil.

A sliding member according to a second aspect is the sliding member according to the first aspect, wherein the mixing ratio of the resin composition is 100 parts by weight of a resin comprising 100 parts by weight of a synthetic resin and 5 to 200 parts by weight of a polyolefin resin. Oil is 0.5 to 30 parts by weight.

The sliding member according to a third aspect is the sliding member according to the first or second aspect, wherein the polyolefin resin is at least one selected from polyethylene and modified polyethylene.

A sliding member according to a fourth aspect is the sliding member according to any one of the first to third aspects, wherein the oil is at least one selected from silicone oil and ester oil. Features.

A sliding member according to a fifth aspect is the sliding member according to any one of the first to fourth aspects, wherein the synthetic resin is a polyamide resin.

The sliding member according to claim 6 is a sliding member comprising a molded article of a resin composition, wherein the resin composition has a chemical structure containing at least 10 or more methylene units between amide bonds. And at least oil.

A sliding member according to a seventh aspect is the sliding member according to the sixth aspect, wherein the compounding ratio of the resin composition is a polyamide resin.
It is characterized in that the oil is 1 to 25 parts by weight with respect to 100 parts by weight.

An eighth aspect of the present invention is the sliding member according to any one of the first to seventh aspects, wherein the resin composition further contains an oil retaining body. I do.

According to a ninth aspect of the present invention, there is provided the sliding member according to any one of the first to eighth aspects, wherein the resin composition further contains a black pigment. .

A sliding bearing device according to a tenth aspect is a sliding bearing device having a sliding bearing portion formed of a molded product of a resin composition, wherein at least the sliding bearing portion is any one of the first to ninth aspects. It is characterized by being formed by a sliding member.

According to a still further aspect of the present invention, there is provided a developing device including at least an electrostatic latent image forming unit, a developer supplying unit, a developing unit, and a transferring unit. The sliding bearing device used in the present invention is the sliding bearing device according to claim 10.

According to a twelfth aspect of the present invention, there is provided the developing device according to the eleventh aspect, wherein the sliding bearing device is a sliding bearing device for a process cartridge.

Various studies were conducted on the oil retaining state and sliding characteristics of the oil-containing resin sliding member. As a result, the oil-containing resin sliding member in which the polyolefin resin coexists has a reduced initial sliding resistance and a sliding characteristic with time. It was observed that there was no increase in dynamic resistance. This is considered to be due to the excellent affinity between the oil and the polyolefin resin having a methylene group uniformly dispersed and mixed in the oil-containing resin sliding member, and the oil is held in the oil-containing resin sliding member in a movable state. It is considered something. The present invention has been made based on such findings. That is, it is a sliding member made of a molded article of a synthetic resin composition in which a polyolefin resin and oil coexist. In addition to the resin composition in which the polyolefin resin coexists, a resin such as polyamide having a structure in which a large number of methylene groups having excellent affinity for oil are present in the molecule can be used even when the polyolefin resin does not coexist. The above-described excellent sliding characteristics can be obtained.

Since the sliding member of the present invention maintains excellent initial lubrication characteristics for a long period of time, by applying the sliding member to a sliding bearing device, an excellent sliding bearing device free from seizure or the like can be obtained. Further, in a developing device using such a sliding bearing device as a supporting bearing portion of a rotating portion, torque can be reduced, so that good image formation can be obtained and the size and weight of the device can be easily reduced.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The sliding member of the present invention is formed from a resin composition in which a polyolefin resin coexists. The polyolefin resin according to the present invention can be used without particular limitation as long as the polyolefin resin has an excellent affinity for oil. Such polyolefin resins include low density polyethylene, linear low density polyethylene,
Examples thereof include polyethylenes such as medium-density polyethylene, high-density polyethylene, and ultrahigh-molecular-weight polyethylene, and polypropylene. These may be used alone or as a mixture, and may be a copolymer or a modified product. Such a resin is preferable because a polyolefin-based resin having a unit represented by the following chemical formula is generally excellent in terms of compatibility with a synthetic resin such as a polyamide-based resin, and price, and the like. —CH ₂ CHX— (where X is at least one or more selected from H, CH ₃ , Cl, OH and an aromatic ring)

Among the polyolefin resins, polyethylenes are preferred as the polyolefin resin according to the present invention in consideration of compatibility with the polyamide resins described later, and more preferably modified polyethylene. The modified polyethylene is preferably a modified polyethylene obtained by grafting a graft monomer such as an α, β-unsaturated carboxylic acid or a derivative thereof to the aforementioned polyethylenes. α, β
-Unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, endocis-bicyclo [2,2,1] hept-5-ene 2, There are 3-dicarboxylic acid and the like, and maleic acid and endocis-bicyclo [2,2,1] hept-5-ene 2,3-dicarboxylic acid are particularly preferred.

The oil according to the present invention can be used as long as it coexists with the polyolefin resin and improves the lubricity of the oil-containing resin. Examples of such oils include silicone oil, polyglycol oil, oligomer oils of olefins, perfluoroalkyl ether oil, perfluoropolyether oil, polyphenyl ether oil, ester oil, alkylbenzene oil, paraffin oil, and naphthenic oil. ,
Examples include phosphate ester oil, polyol ester oil, diester oil, silicate ester oil, fatty acid ester oil, polycarbonate oil and the like. In particular, a heat-resistant oil is preferable for the sliding member, and a suitable oil according to the present invention includes at least one oil selected from silicone oil and ester oil. It is preferable that each of the silicone oil and the ester oil is used alone in order to maintain oil retention.

Silicone oil is a polymer of dimethylsiloxane or one or more aliphatic groups such as methyl, or a part thereof, of hydrogen, phenyl, halogenated phenyl, halogenated alkyl, or fluoroester. Alternatively, a derivative substituted with an aromatic residue may be used. Such a silicone oil is a compound having no functional group. Further, silicone oil having a functional group may be used, and polyorganosiloxane is obtained by introducing a functional group into a homopolymer or a copolymer of two or more siloxanes such as dimethylsiloxane, methylphenylsiloxane, and trimethylfluoropropylsiloxane. The functional groups are, for example, an epoxy group, an amino group, a carboxy group, a hydroxyl group, a mercapto group, an isocyanate group, a cyanate group, and a vinyl group. Silicone oils and the like are polymer type oils that are flame retardant, and adjust the molecular weight to, for example, increase the viscosity at 25 to 40 ° C to 50 cs.
t or more and 500 cst or more, preferably 5,000 to 500,000 cst
Can be adjusted.

The ester oil refers to an oil composed of a compound having an ester bond in a molecule formed by a reaction between a hydroxyl group and a carboxyl group. Among ester oils, ester oils which are reaction products of polyhydric alcohols such as trimethylolethane, trimethylolpropane and pentaerythritol with monohydric fatty acids, polybasic acids and the like (for example, those described in JP-A-3-128992) Polyester-based oil) is preferred, and pentaerythritol full ester is particularly preferred because of its good heat stability. Further, a partial ester having an excellent affinity for a methylene group can be suitably used. Such a full ester or partial ester is preferable because it has no heat atom on the carbon at the β-position derived from the alcohol, and thus has excellent heat resistance. If necessary, sulfur-based, phosphorus-based, halogen-based extreme pressure additives, or antiwear agents, antioxidants, heat resistance improvers, corrosion inhibitors, hydrolysis inhibitors, defoamers, etc. It may contain additives.

The oil according to the present invention preferably has a viscosity such that the oil does not rapidly exude from the sliding member due to frictional heat during sliding, and more specifically, the viscosity at 40 ° C. is in the range of 5 to 500,000 cst. Is preferred. If the viscosity exceeds this range, the oil may not be sufficiently dispersed at the time of granulating the molding pellets or at the time of injection molding. For this reason, the kinematic viscosity at 100 ° C. should be at least 10 cst,
~ 200 cst, 20 cst or more at 25-40 ° C, preferably
40-400 cst, viscosity index 100-500, depending on the type
Oils having viscosity properties of the order of 150 to 300 are preferred. Further, from the viewpoint of flame retardancy, the flash point is preferably at least 200 ° C or higher, and more preferably 250 to 500 ° C or lower from the viewpoint of safety.

The synthetic resin according to the present invention is not particularly limited, and a thermoplastic resin or a thermosetting resin as described below can be used. Here, the synthetic resin is
Any one or more different synthetic resins selected from polyolefin resins, such as various synthetic polymers listed in the above-mentioned polyolefin-based resins, may be used.
For example, it refers to resins other than the aforementioned polyolefin resins. That is, polytetrafluoroethylene-chlorotrifluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer resin, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer resin, vinylidene fluoride resin, ethylene-tetrafluoroethylene copolymer resin , Ethylene-chlorofluoroethylene copolymer resin, vinylidene chloride resin, chlorinated polyolefin resin, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, acrylonitrile-butadiene-styrene resin, polyamide resin, methacrylic resin, polyacetal resin , Polycarbonate resin, cellulose resin, polyurethane resin, polyimide resin, polyetherimide resin, polyamideimide resin, ionomer resin, Thermoplastic resins such as phenylene oxide resin, polyallyl sulfone resin, polyallyl ether resin, polyether ether ketone resin, polyphenylene sulfide resin, polysulfone resin, wholly aromatic polyester resin, polyethylene terephthalate resin, phenolic resin, urea resin, melamine Resin, melamine phenol co-condensation resin, xylene modified phenol resin, urea guanamine co-condensation resin, amino resin, aceto guanamine resin, melamine anamin resin,
Thermosetting resins such as alkyd resin, diallyl phthalate resin, xylene resin, epoxy resin, epoxy acrylate resin, silicone resin and urethane resin can be used. Among the above, the synthetic resin that can be injection-molded is excellent in productivity because it can efficiently manufacture sliding members such as sliding bearings. Among them, the thermoplastic resin that can be injection-molded is highly productive. It can be said that it is preferable because of its excellent shape. Further, among these, a non-polyolefin resin may be appropriately selected.

Among these resins, polyamide resins are particularly preferred as the main synthetic resin according to the present invention because they have excellent compatibility with polyolefin resins and exhibit excellent lubricity. Polyamide resin is polyhexamethylene adipamide (6,6-nylon), polyhexamethylene azeramid (6,9-nylon), polyhexamethylene sebacamide (6,10-nylon), polyhexamethylene dodecamide (6,12-nylon), polytetramethylene adipamide (4,6-nylon), polycaprolactam (6-nylon), polylaurin lactam (12-nylon), poly-1
Aliphatic polyamide resins such as 1-aminoundecanoic acid (11-nylon) and polymethaxylene adipamide (nylon MXD-6), and aromatic polyamide resins such as polymetaphenylene isophthalamide and polyparaphenylene terephthalamide And these can be used alone or as a mixture. As a main synthetic resin according to the present invention, an aliphatic polyamide resin exhibiting excellent lubricity in a mixed system of a polyolefin resin and oil is particularly preferable. Particularly, polycaprolactam (6-nylon) resin is preferable because of its excellent compatibility with polyolefin resin.

Further, polyamide resins having a chemical structure containing at least 10 or more methylene units between amide bonds, such as poly-11-aminoundecanoic acid (11-nylon) and polylaurin lactam (12-nylon), are available. It was confirmed that the oil retention performance was excellent even without containing a polyolefin resin. This is thought to be due to the relatively long methylene units contained in the molecule. Therefore, even if the polyamide resin containing at least 10 or more methylene units does not contain a polyolefin resin, an excellent sliding member can be obtained by combining it with silicone oil or ester oil.

Next, the mixing ratio of the polyolefin resin and the oil in the sliding member of the present invention will be described. The mixing ratio of the sliding member of the present invention is preferably, for example, 5 to 200 parts by weight of a polyolefin resin with respect to 100 parts by weight of a synthetic resin made of a polyamide resin or the like, and a synthetic resin containing this polyolefin resin. It is preferable to add 0.5 to 30 parts by weight of oil to 100 parts by weight. If the polyolefin resin content is less than 5 parts by weight, the torque will not be sufficiently reduced when the bearing is used as a sliding bearing.
If the amount exceeds the weight part, the dimensional accuracy of the molded article may be reduced. If the amount of oil is less than 0.5 part by weight, the torque cannot be sufficiently reduced, and if the amount exceeds 30 parts by weight, a resin composition having a stable composition may not be obtained. Excellent torque reduction, a more preferable range to obtain more excellent dimensional accuracy is, for example, 100 to 100 parts by weight of a synthetic resin such as polyamide resin, 20 to 150 parts by weight of polyolefin resin,
The oil is 5 to 30 parts by weight based on 100 parts by weight of the synthetic resin containing the polyolefin resin.

The mixing ratio of the other sliding member of the present invention is preferably 1 to 25 parts by weight of oil with respect to 100 parts by weight of the polyamide resin. When the oil is in this range, a sliding member having excellent torque reduction and excellent dimensional accuracy can be obtained. A more preferred range is from 10 to 20 parts by weight of oil.

The sliding member of the present invention can further contain an oil retaining body. As the oil retaining body, any material can be used as long as it can ooze silicone oil or ester oil from the sliding member at an appropriate speed, and a porous material which is an inorganic compound and has a large specific surface area is preferable. Specific examples include talc, clay, calcium carbonate, carbon, graphite, activated carbon, and the like. The blending ratio of such an oil retaining body is 1 to 25 parts by weight of the oil retaining body with respect to 100 parts by weight of the above-described synthetic resin and a resin composition containing an olefin resin and an oil or a polyamide resin composition containing an oil. It is preferable to mix parts. If the amount of the oil retaining body is less than 1 part by weight, it is difficult to obtain an oil retaining effect, and if it exceeds 25 parts by weight, the retained oil does not exude at an appropriate speed, so that the torque tends to increase. A more preferred range is 1 to 10 parts by weight of the oil retaining body. The sliding member of the present invention can contain additives such as an inorganic filler, an ultraviolet absorber, an antioxidant, a colorant, and a flame retardant, if necessary. The sliding member of the present invention can be manufactured by an injection molding method having excellent productivity.

In the present invention, it is preferable to use a colorant such as a black pigment for the following reasons. Waste materials such as sprues, runners and defective products generated in the process of injection molding are required to be reused rather than treated as industrial waste from the viewpoint of environmental protection and resource protection. If you want to reuse it,
The physical properties of the sliding member, including the appearance, must maintain the physical properties of the sliding member obtained from unused raw materials. In the sliding member of the present invention, it was found that the use of a coloring agent such as a black pigment maintained the physical properties of the sliding member including the appearance even when the waste material was mixed in a predetermined range. The mixing ratio of the black pigment to the resin composition is not more than 7 parts by weight, preferably not more than 4 parts by weight, based on 100 parts by weight of the resin composition, and the amount capable of coloring the resin composition is not less than 0.5 part by weight. If the amount exceeds 7 parts by weight, the weld strength of the molded product during molding becomes weak, and it is not suitable for use as a sliding member.

The sliding member according to the present invention can be obtained by mixing and pelletizing the above-mentioned materials and then molding. That is, Henschel mixer, ball mill,
The mixture is mixed by a mixer such as a tumbler mixer and the mixture is supplied to an injection molding machine having good melt mixing properties, or is melted and mixed in advance with a hot roller, a kneader, a Banbury mixer, or a melt extruder to form pellets. Then injection molding method,
A molded article having the desired shape of the sliding member can be obtained by a compression molding method, an extrusion molding method or the like. In mixing the materials, for example, only the synthetic resin containing the polyolefin resin may be pelletized in advance, and then the oil component and the oil retaining body may be melted and mixed.

The sliding member of the present invention has excellent lubricating properties and can be applied to a sliding bearing, a sliding bearing device, a sealing material and the like of office machines / information devices, automobiles / electrical devices, home electric appliances and the like.

In the sliding bearing device according to the present invention, at least the sliding bearing portion is constituted by the above-mentioned sliding member. Therefore, the entire sliding bearing device including the housing portion may be constituted by the sliding member according to the present invention, or only the sliding bearing portion may be constituted by the sliding member. One example of the sliding bearing device of the present invention will be described with reference to FIG. FIG. 1 shows an example in which a housing part 2 and a sliding member 1 are combined via a detent 2a to form a plain bearing device. In this case, it is possible to separate the functions so that the sliding member has sliding characteristics and the housing portion has characteristics other than sliding characteristics such as mechanical characteristics and durability. Bearing device having dynamic characteristics and the like can be obtained. In addition, such a sliding bearing device is characterized in that the characteristics are separated into functions. For example, if the load applied to the sliding bearing device is only one direction, the sliding member may be disposed only in the direction in which the load is applied. it can. The sliding bearing device of the present invention,
Less deterioration of initial sliding characteristics and sliding characteristics over time,
It can be suitably applied to rotary bearings of OA equipment, AV equipment, and the like.

The developing device of the present invention comprises an electrostatic latent image forming means,
The above-described slide bearing device is used in one part of an apparatus constituting a developer supply unit, a development unit, and a transfer unit. Here, the electrostatic latent image forming means is an electrostatic latent image holding member,
For example, charging for applying a surface potential to the surface of a photosensitive drum, a photosensitive belt, or the like, and forming an electrostatic latent image by subsequent exposure means. Developer supply means is a developer housed in a developing housing. To a developing roller disposed opposite to the electrostatic latent image holding member, and the developing means means that the developer supplied by the developing roller visualizes the latent image on the electrostatic latent image holding member. The transfer means means to transfer this visual image to a final image support such as paper. An example of a developing device in which the bearing device of the present invention is used for a rotation support portion will be described with reference to FIG. FIG. 2 is an example of a developing device using a two-component developing method. Developer 3 such as toner
, A stirring member 5 for stirring the developer 3 in the container 4, a developing roller 7 opposed to the electrostatic latent image holding member 6, and a magnetic member 8 included in the developing roller 7. And a developer regulating member 9 for regulating the amount of the developer 3 supplied to the developing roller 7, and a transfer device 10. Reference numeral 11 denotes a charger, 12 denotes an exposure device such as a laser beam, 13 denotes a cleaning device, and 14 denotes a path of a sheet or the like. When the sliding bearing device of the present invention, which has excellent sliding characteristics, is used for supporting bearings such as the stirring member 5, the electrostatic latent image holder 6, the developing roller 7, and the like, it is possible to reduce the shaft torque for driving rotation. For this reason, a small driving device can be used, and the size and weight of the developing device can be reduced. Therefore, the present invention is suitable for, for example, a process cartridge in which an electrostatic latent image forming unit, a developer supplying unit, a developing unit, and the like are formed into a cartridge.

FIG. 3 shows an example of a sliding portion of a process cartridge using the sliding bearing device of the present invention. The shaft end of the developing roller 7 facing the electrostatic latent image holding member 6 is supported by the sliding member 1 press-fitted into the housing portion 2. The developing roller 7 made of a soft metal such as an aluminum alloy has a magnetic member 8 therein. Further, a developer is supplied to the latent image formed on the surface of the electrostatic latent image holding member 6. Reference numeral 2 denotes a housing, 15 denotes a case, and 16 denotes a rubber seal. As described above, the sliding bearing made of the sliding member 1 of the present invention has a flange portion on the side while rotating the shaft of the developing roller 7 and has a flange portion on the side surface. It has the function of sealing the toner and the like while sliding on the lip portion of the rubber V-ring for sealing the powdered substance of No. 3, and the function of fixing the slide bearing in the thrust direction. Such a process cartridge can reduce the axial torque of the developing roller 7 that rotates.
No rotation unevenness occurs. As a result, good images can be formed.

[0039]

【Example】

Example 1 Polycaprolactam (6-nylon) resin (Amilan CM
1007 parts by weight of 1007 (trade name, manufactured by Toray Industries, Inc.) and 150 parts by weight of modified polyethylene were blended into a polymer alloy, and 100 parts by weight of the polymer alloy was mixed with an ester oil (Unistar H-481R (trade name, manufactured by NOF Corporation) ) Was impregnated with 7.5 parts by weight of oil and injection molded into the shape of a plain bearing. The modified polyethylene used herein is a high-molecular-weight polyethylene (Lubmer L4000 (trade name, manufactured by Mitsui Petrochemical Co., Ltd.)) modified by graft polymerization of maleic anhydride, and is a polymer of polycaprolactam (6-nylon). Easy alloying. The ester oil used here is an ester oil (Unistar H-481R (trade name, manufactured by NOF CORPORATION)) having no hydrogen atom on the carbon at the β-position of the alcohol portion. 11.9cst,
64.2 cst at 40 ° C, viscosity index 184, flash point 300 ° C
And has excellent heat resistance. The shape of the plain bearing was a test bearing shape for a friction torque measuring machine of a low friction oil-impregnated resin plain bearing.

The sliding characteristics were measured using the obtained sliding bearing. FIG. 4 shows a friction torque measuring machine. In the torque measurement, the bearing 17 is incorporated in the housing 18, and the friction force between the bearing 17 and the aluminum alloy countershaft 19 is measured by the load cell 21 via the static pressure air linear bearing 20. The load was pushed up by the load coil spring 22 via the static pressure air linear bearing 20 to push up the housing 18. 23 is a fulcrum. Table 1 shows the torque measurement conditions, and Table 3 shows the measurement results.

Example 2 Ester oil was silicone oil (KF96H-6000 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), kinematic viscosity at 25 ° C. 6,000 ± 30)
A sliding bearing was molded under the same conditions and method as in Example 1 except that the temperature was changed to 0 cst and the flash point was 315 ° C. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 3 A slide bearing was molded under the same conditions and method as in Example 1 except that the content of the modified polyethylene was changed to 66.7 parts by weight. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 4 Example 3 except that the ester oil was replaced with the above silicone oil.
A sliding bearing was formed under the same conditions and under the same conditions. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 5 10 parts by weight of talc powder, 100 parts by weight of polylaurin lactam (12-nylon) resin (Diamid L1640 (trade name, manufactured by Daicel Huls Co.)), and ester oil (Unistar H-481R (Nippon Oil & Fat) Was mixed with 15 parts by weight of the product and pelletized, and then injection-molded into a plain bearing shape. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 6 Example 5 except that the ester oil was replaced with the above silicone oil.
A sliding bearing was formed under the same conditions and under the same conditions. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 7 A slide bearing was formed under the same conditions and in the same manner as in Example 5, except that activated carbon was used instead of talc powder. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 8 A sliding bearing was formed under the same conditions and in the same manner as in Example 6, except that activated carbon was used instead of talc powder. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Example 9 Polycaprolactam (6-nylon) resin (Amilan CM
1007 parts by weight of 1007 (trade name, manufactured by Toray Industries, Inc.) and 150 parts by weight of unmodified high-molecular-weight polyethylene (Lubmer L4000 (trade name, manufactured by Mitsui Petrochemical Industry Co., Ltd.)) were blended into a polymer alloy. To 10 parts by weight of talc powder and ester oil (Unistar H-481)
R (trade name, manufactured by Nippon Oil & Fats Co., Ltd.)) and 7.5 parts by weight to form a pellet, and then a plain bearing was formed. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Examples 10 to 13 Sliding bearings were molded under the same conditions and method as in Example 1 with the resin formulations shown in Table 2. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 3 shows the measurement results.

Comparative Examples 1 to 5 A sliding bearing was molded under the same conditions and method as in Example 1 using only the following resin materials which did not coexist with a polyolefin resin. Comparative Example 1: Oil-impregnated polyacetal resin (SW-01 (trade name of Polyplastics)) Comparative Example 2; oil-impregnated polyacetal resin (OL-10 (trade name of Polyplastics)) Comparative Example 3: oil-impregnated nylon resin (ESBEAR SN520
(Starlight Industry Co., Ltd.)) Comparative Example 4; Polyphenylene Sulfide Resin (Greylon SE (Oiles Industry Co., Ltd.)) Comparative Example 5: Polyphenylene Sulfide Resin (BEARY AS5000 (NTN Precision Resin Co., Ltd.)) The same evaluation as in Example 1 was performed using a sliding bearing. Table 3 shows the measurement results.

[0051]

[Table 1]

[0052]

[Table 2]

[0053]

[Table 3]

As shown in Table 3, the plain bearing of each embodiment containing oil in the presence of the polyolefin resin was as follows:
The initial friction torque was significantly reduced as compared with that of the comparative example. Further, it can be seen that the initial friction torque is maintained over a long period of time, and the oil retention is excellent.

Example 14 100 parts by weight of polylaurin lactam (12-nylon) resin (Daiamide L1640 (trade name, manufactured by Daicel Huls)) was mixed with 100 parts by weight of an unmodified high molecular weight polyethylene (Lubmar-L).
4000 (trade name of Mitsui Petrochemical Industry Co., Ltd.)) into 11.1 parts by weight to form a polymer alloy.
Then, 8.4 parts by weight of ester oil (Unistar H-481R (trade name, manufactured by NOF Corporation)) was mixed with 00 parts by weight to form a pellet, and then a sliding bearing was formed. The same evaluation as in Example 1 was performed using the obtained sliding bearing. Table 4
Table 5 shows the measurement results.

Example 15 Polycaprolactam (6-nylon) resin (Amilan CM
1007 (trade name, manufactured by Toray Industries, Inc.), 100 parts by weight, and 42.9 parts by weight of modified polyethylene were blended to form a polymer alloy,
100 parts by weight of this polymer alloy was impregnated with 10.8 parts by weight of an ester oil (Unistar H-481R (trade name, manufactured by NOF Corporation)) and injection molded into a slide bearing shape. In addition,
The modified polyethylene used was the same as in Example 1. The same evaluation as in Example 1 was performed using the obtained sliding bearing. The composition is shown in Table 4 and the measurement results are shown in Table 5.

Example 16 The procedure of Example 16 was repeated except that 1.6 parts by weight of graphite (Lonza KS-10 (trade name, manufactured by Lonza)) was further blended with 100 parts by weight of a polymer alloy of polycaprolactam (6-nylon) resin and modified polyethylene. A sliding bearing was formed under the same conditions and method as in No. 15. Example 1 using the obtained sliding bearing
The same evaluation and hue were confirmed. Table 4
Table 5 shows the measurement results.

Example 17 A sprue, a runner and a molded product made of the same resin material as in Example 16 were crushed by a crusher. Injection molding was performed using this pellet, and the same operation was repeated three times to produce a four-time recycled material of the resin material of Example 16. This 4
The recycled material and the same unused virgin material as in Example 16 were mixed at a weight ratio of 8: 2, and injection molded into the shape of a plain bearing. The same evaluation and hue as in Example 1 were performed using the obtained sliding bearing. The composition is shown in Table 4 and the measurement results are shown in Table 5.

Example 18 A synthetic resin (Lubuma-LS) which is a polymer alloy of polycaprolactam (6-nylon) resin and modified polyethylene
4160: Polycaprolactam (6-nylon) resin 100
21.5 parts by weight of ester oil (Unistar H-481R (trade name of Nippon Oil & Fats Co.)) is added to 100 parts by weight of modified polyethylene containing 20 to 60 parts by weight of modified polyethylene per part by weight (trade name of Mitsui Petrochemical Industries, Ltd.). And injection molded into a sliding bearing shape. The same evaluation as in Example 1 was performed using the obtained sliding bearing. The composition is shown in Table 4 and the measurement results are shown in Table 5.

Comparative Example 6 A synthetic resin (Lubmer LS) which is a polymer alloy of polycaprolactam (6-nylon) resin and modified polyethylene
4160: Polycaprolactam (6-nylon) resin 100
Injection molding was performed in the form of a plain bearing using 20 to 60 parts by weight of modified polyethylene based on parts by weight (trade name, manufactured by Mitsui Petrochemical Industries, Ltd.). The same evaluation as in Example 1 was performed using the obtained sliding bearing. The composition is shown in Table 4 and the measurement results are shown in Table 5.

[0061]

[Table 4]

[0062]

[Table 5]

As shown in Table 5, the sliding bearings of the respective examples in which oil was contained in the presence of polyolefin resin were as follows:
The initial friction torque was significantly reduced as compared with that of the comparative example. Further, it can be seen that the initial friction torque is maintained over a long period of time, and the oil retention is excellent.
Example 1 in which a pigment was blended and a recycled material was used four times
No. 7 had the same hue appearance as the virgin material, and there was no difference in friction torque and wear depth from the virgin material.

[0064]

The sliding member of the present invention contains at least a polyolefin resin and an oil in a synthetic resin, or at least a polyamide resin and an oil having a chemical structure containing at least 10 or more methylene units between amide bonds. Since it contains, it has excellent oil retaining properties. As a result, the initial sliding characteristics are excellent, and the characteristics can be maintained for a long time. In addition, since the oil retaining body is contained, the oil retaining property is further improved. In addition, because it contains a black pigment,
Colored recycled materials can be used.

In the sliding bearing device of the present invention, since at least the sliding bearing portion is formed of the above-mentioned sliding member, the initial friction torque can be reduced and the value can be maintained for a long period of time.

In the developing device of the present invention, since the above-described plain bearing device is used for the supporting rotating portion, the driving torque can be reduced. As a result, a low output motor can be used as the drive motor, and the size and weight of the developing device and the process cartridge used therein can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a slide bearing device.

FIG. 2 is a diagram illustrating an example of a developing device.

FIG. 3 is a diagram illustrating an example of a sliding portion of a process cartridge.

FIG. 4 is a view showing a friction torque measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding member 2 Housing part 2a Non-rotating 3 Developer 4 Container 5 Stirring member 6 Electrostatic latent image holder 7 Developing roller 8 Magnetic member 9 Developer regulating member 10 Transfer device 11 Charging device 12 Exposure device 13 Cleaning device 14 Paper Routes such as 15 Case 16 Rubber seal

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 83/04 C08L 83/04 F16C 33/20 F16C 33/20 // (C10M 169/04 107: 44 107: 04 129: 68 139: 04 ) C10N 30:06 40:02 50:08

Claims (12)

[Claims] 1. A sliding member comprising a molded article of a resin composition, wherein the resin composition contains at least a synthetic resin, a polyolefin resin and oil. 2. The mixing ratio of the resin composition is 100 parts by weight of the synthetic resin and 5 to 200 parts by weight of the polyolefin resin.
For 100 parts by weight of resin consisting of parts by weight, the oil is 0.5
The sliding member according to claim 1, wherein the amount is from 30 to 30 parts by weight. 3. The sliding member according to claim 1, wherein the polyolefin resin is at least one selected from polyethylene and modified polyethylene. 4. The sliding member according to claim 1, wherein the oil is at least one selected from silicone oil and ester oil. 5. The sliding member according to claim 1, wherein the synthetic resin is a polyamide resin. 6. A sliding member comprising a molded article of a resin composition, wherein the resin composition contains at least a polyamide resin having a chemical structure containing at least 10 or more methylene units between amide bonds and an oil. A sliding member, comprising: 7. The sliding member according to claim 6, wherein the mixing ratio of the resin composition is 1 to 25 parts by weight of the oil based on 100 parts by weight of the polyamide resin. 8. The sliding member according to claim 1, wherein the resin composition further contains an oil retaining body. 9. The sliding member according to claim 1, wherein the resin composition further contains a black pigment. 10. A sliding bearing device having a sliding bearing portion made of a molded article of a resin composition, wherein at least the sliding bearing portion is formed by the sliding member according to any one of claims 1 to 9. A sliding bearing device characterized by being made. 11. An electrostatic latent image forming unit, a developer supply unit,
A developing device comprising at least a developing unit and a transfer unit, wherein the sliding bearing device used in at least one part of the device constituting each of the units is the sliding bearing device according to claim 10. Developing device. 12. The developing device according to claim 1, wherein said sliding bearing device is a sliding bearing device for a process cartridge.