CN112543894B - elastic roller - Google Patents
elastic roller Download PDFInfo
- Publication number
- CN112543894B CN112543894B CN201980052921.3A CN201980052921A CN112543894B CN 112543894 B CN112543894 B CN 112543894B CN 201980052921 A CN201980052921 A CN 201980052921A CN 112543894 B CN112543894 B CN 112543894B
- Authority
- CN
- China
- Prior art keywords
- layer
- elastic
- surface layer
- isocyanate compound
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Dry Development In Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
Provided is an elastic roller provided with: a shaft body; and an elastic layer provided on the outer peripheral surface of the shaft body; and a surface layer provided outside the elastic layer; the elastic roller is provided with an adhesive layer between the elastic layer and the surface layer, and the resistance value of the elastic layer is 1×10 4 Omega or more and 1X 10 6 The relative dielectric constant of the adhesive layer is 1 to 10 inclusive at 100Hz, 1000 to 10000 inclusive at 0.01Hz, and the relative dielectric constant of the surface layer is 1 to 10 inclusive at 100Hz, and 200 inclusive at 0.01 Hz.
Description
Technical Field
The present invention relates to an elastic roller.
Background
A developing roller used in an image forming apparatus such as a copier, a printer, a facsimile machine, and the like employing an electrophotographic system has a function of conveying developer onto an image carrier on which an electrostatic latent image is formed. The developer conveying performance of the developing roller affects the quality of the image forming apparatus, particularly the printing density. Therefore, there has been studied to improve the developer conveying performance of the developing roller by forming irregularities on the surface of the developing roller and adjusting the electrical characteristics of various materials constituting the developing roller.
Here, when the developing roller is used for a long period of time, the developer sometimes adheres to its surface (referred to as "filming"). Such filming is considered to be caused by, for example, deformation or breakage of the developer due to sliding stress of a blade or the like in pressure contact with the elastic roller when the developer is charged or adhered, and further melting of the developer due to frictional heat with the blade or the like. In general, in the production of a developing roller, it is required to provide an elastic roller which suppresses the occurrence of filming as much as possible and stabilizes durable printing performance.
As an elastic roller for suppressing film formation, for example, patent document 1 discloses an elastic roller which is a developing roller provided with a conductive shaft body, a conductive elastic layer formed on the outer periphery of the conductive shaft body, and a toner bearing layer formed on the outer periphery of the conductive elastic layer; wherein particles having an average particle diameter of 11nm or more and 40nm or less are dispersed on the surface of the toner-carrying layer, and the rotation torque of the developing roller is 2.5N or more and 3.5N or less.
Patent document 2 discloses an elastic roller including at least a shaft made of metal, an elastic layer supported on the outer periphery of the shaft, and a surface layer formed on the outer periphery of the elastic layer; wherein the surface layer contains polyurethane composed of reactant of vinyl fluoride vinyl ether copolymer and isocyanate cyanuric acid ester compound, and microparticles with primary particle diameter of 5-30 nm, and peak intensity ratio of NCO group and hydroxyl group of the polyurethane is 5.6-8.8 in infrared absorption spectrum obtained by ATR method.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication 2016-177253
Patent document 2: japanese patent laid-open publication No. 2014-215546
Disclosure of Invention
Problems to be solved by the invention
However, even if the elastic rollers disclosed in patent document 1 and patent document 2 suppress the occurrence of film formation, there is a concern that the capacitance for carrying or supplying the developer tends to decrease, and the developer cannot be charged stably, with the result that there is a possibility that the print density may decrease.
The present invention has been made in view of the above-described problems, and an object thereof is to provide an elastic roller capable of favorably suppressing occurrence of film formation and reduction in print density.
Technical means for solving the problems
As a result of diligent studies, the inventors of the present invention have found that, in an elastic roller including a shaft body, an elastic layer provided on the outer peripheral surface of the shaft body, and a surface layer provided outside the elastic layer, the above problems are solved by adjusting the resistance value of the elastic layer, the relative dielectric constant of the surface layer, and the relative dielectric constant of an adhesive layer or primer layer provided between the elastic layer and the surface layer, and completed the present invention. Specifically, the present invention provides the following.
(1) One embodiment of the present invention is an elastic roller including: a shaft body; and an elastic layer provided on an outer peripheral surface of the shaft body; and a surface layer provided outside the elastic layer; wherein the elastic roller is provided with an adhesive layer between the elastic layer and the surface layer, and the elastic layer has a resistance value of 1×10 4 Omega above and 5×10 6 Omega or less, the relative dielectric constant of the adhesive layer is 1 or more and 10 or less at 100Hz, 1000 or more and 10000 or less at 0.01Hz, and the relative dielectric constant of the surface layer is 1 or more and 10 or less at 100Hz, 10 or more and 200 or less at 0.01 Hz.
(2) The elastic roll as described in the embodiment (1) above, wherein the adhesive layer contains an organic titanium compound and/or an organic zirconium compound.
(3) The elastic roll according to the embodiment (1) or (2) above, wherein the surface layer is formed by adding silicone rubber particles and/or acrylic particles of 2 μm or more and 10 μm or less and a second isocyanate compound to a binder main agent and curing the mixture; wherein the adhesive main agent is obtained by mixing and reacting an isocyanurate-type isocyanate compound and/or an adduct-type isocyanate compound with both terminal-modified silicone oil.
(4) The elastic roll according to any one of the above embodiments (1) to (3), wherein the surface layer is formed by adding silicone rubber particles and/or acrylic particles of 2 μm or more and 10 μm or less and a second isocyanate compound to a binder main agent and curing the mixture; wherein the adhesive main agent is obtained by mixing a carbonate polyol and/or a fluorine polyol in both terminal modified silicone oils, and further mixing and reacting an isocyanurate type isocyanate compound and/or an adduct type isocyanate compound.
Effects of the invention
According to the present invention, it is possible to provide an elastic roller capable of favorably suppressing occurrence of film formation and reduction in print density.
Drawings
Fig. 1 is a schematic view showing an elastic roller of the present invention.
Description of the reference numerals
1. Elastic roller
2. Shaft body
3. Elastic layer
4. Surface layer
Detailed Description
The present invention will be described in detail below with reference to the drawings.
< elastic roller >)
The elastic roller 1 of the present invention includes a shaft body 2, an elastic layer 3 provided on an outer surface of the shaft body 2, and a surface layer 4 provided outside the elastic layer 3 (as shown in fig. 1). The elastic roller 1 of the present invention is preferably used as a developing roller, but is not limited to this use.
[ shaft body ]
The shaft body 2 is preferably a shaft body used for a conventionally known elastic roller having an electric conductive property. Preferably, the shaft body 2 is composed of at least one metal selected from the group consisting of iron, aluminum, stainless steel, and brass, for example. Further, such a shaft body 2 is also commonly referred to as "core gold".
The shaft body 2 may also include an insulating resin. The insulating resin may be, for example, a thermoplastic resin or a thermosetting resin. The shaft body 2 may include a core body made of, for example, an insulating resin, and a plating layer provided on the core body. Such a shaft body 2 can be obtained by, for example, electroplating a core body made of an insulating resin to make it conductive.
The shaft body 2 is preferably core gold to obtain good conductive properties.
The shaft body 2 is preferably shaped like a rod, a tube, or the like. The cross-sectional shape of the shaft body 2 may be circular or elliptical, or may be non-circular, such as polygonal. On the outer peripheral surface of the shaft body 2, a treatment such as a cleaning treatment, a degreasing treatment, a primer treatment, or the like may be performed.
The length of the shaft body 2 in the axial direction is not particularly limited, and may be appropriately adjusted according to the form of the image forming apparatus to be provided. The diameter of the shaft body 2 (diameter of the circumscribed circle) is not particularly limited, and may be appropriately adjusted according to the form of the image forming apparatus to be mounted.
[ elastic layer ]
In the elastic roller 1 of the present invention, the resistance value of the elastic layer 3 is 1×10 1 Omega or more and 1X 10 7 Omega or less. By adjusting the resistance value of the elastic layer 3 to be within this range, particularly in the initial stage (for example, about 1 to 500 sheets of paper), the chargeability of the developer can be stabilized, and a decrease in printing density can be suppressed. The resistance value of the elastic layer 3 is preferably 1×10 3 Omega or more and 1X 10 7 Omega or less, more preferably 1X 10 4 Omega above and 5×10 6 Omega or more.
The elastic layer 3 is made of a rubber material containing silicone rubber. Since the elastic layer 3 contains silicone rubber, compression set can be reduced, and an effect of excellent flexibility in a low-temperature environment can be obtained.
Examples of the silicone rubber include crosslinked products of organopolysiloxane such as dimethylpolysiloxane and diphenylpolysiloxane. In addition, silicone rubbers may also be their modified products.
The elastic layer 3 preferably contains mainly silicone rubber. Specifically, the content of the silicone rubber in the elastic layer 3 is preferably 30 mass% or more, more preferably 40 mass% or more, and still more preferably 60 mass% or more, based on the total mass of the elastic layer 3.
The elastic layer 3 may contain a component other than the rubber material. For example, the elastic layer 3 may further contain a conductivity imparting agent. The conductivity imparting agent may be any component for imparting conductivity to the elastic layer 3, and is not particularly limited. Examples of the conductivity imparting agent include conductive powders containing conductive carbon, rubber carbon, metal, conductive polymer, and the like. As the conductive powder, carbon black is preferably used, and examples of the carbon black include: furnace Black such as Ketjen Black (registered trademark), acetylene Black, channel Black, thermal Black, and the like.
In the elastic roller 1, the elastic layer 3 is formed such that the outer peripheral surface of the shaft body 2 is exposed at both ends in the axial direction of the shaft body 2. That is, there is a region where the elastic layer 3 is not provided on the outer peripheral surface of the shaft body 2. However, in the present invention, the form of the elastic layer 3 is not limited to this form, and the elastic layer 3 may be provided so as to cover the entire outer peripheral surface of the shaft body 2.
The elastic layer 3 may be a solid layer, preferably without cavities inside the layer. "solid" in this specification means that the interior non-existent area of the layer is 0.1mm 2 The above/each cavity.
The JIS A hardness of the elastic layer 3 is preferably 20 to 55. Since the JIS a hardness (JIS K6301) of the elastic layer 3 is within the above range, the contact area (nip width) between the elastic roller 1 and the abutted object (for example, an image carrier such as a photoconductor) becomes large, so that the performance of transfer efficiency, charging efficiency, developing efficiency, and the like tends to be further improved. In addition, the possibility of mechanical damage to the abutted object is reduced.
The thickness of the elastic layer 3 is preferably 0.5mm or more and 10mm or less, more preferably 1mm or more and 5mm or less, from the viewpoint that the nip width with the object to be abutted can be ensured to be uniform or the like in the abutted state. Further, in the present specification, "thickness" refers to a thickness in a direction perpendicular to the axial direction of the elastic roller 1. The outer diameter of the elastic layer 3 is not particularly limited. For example, the outer diameter may be 5mm or more and 20mm or less. In addition, in the present specification, "outer diameter" refers to an outer diameter in a section perpendicular to the axial direction of the elastic roller 1. The thickness and the outer diameter of the elastic layer 3 may be adjusted by adjusting the amount of the rubber composition used in forming the elastic layer 3, or by polishing or grinding the outer peripheral surface of the elastic layer 3 or the like after forming the elastic layer 3.
On the outer peripheral surface of the elastic layer 3, surface treatments such as primer treatment, corona treatment, plasma treatment, excimer treatment, UV treatment, ITRO treatment, and flame treatment may be performed.
The elastic layer 3 may be a cured product of a rubber composition shown below.
(rubber composition)
The rubber composition preferably contains a rubber component of silicone rubber formed by crosslinking. Examples of such a rubber component include silicone rubber such as organopolysiloxane.
Examples of the organopolysiloxane include an organopolysiloxane represented by the following average composition formula.
RnSiO (4-n)/2
[ wherein R represents a monovalent hydrocarbon group which may be substituted. The number of carbon atoms of the hydrocarbon group is preferably 1 to 12; more preferably 1 to 8. The two or more R's may be the same or different. n represents a number of 1.95 to 2.05 inclusive. ]
Examples of R in the above formula include: alkyl groups such as methyl, ethyl, propyl, butyl, hexyl, dodecyl, and the like; cycloalkyl groups such as cyclohexyl; alkenyl groups such as vinyl, allyl, butenyl, hexenyl, and the like; aryl groups such as phenyl and tolyl; aralkyl groups such as β -phenylpropyl; and an organic group in which part or all of hydrogen atoms bonded to carbon atoms of the above-mentioned groups such as chloromethyl group, trifluoropropyl group, cyanoethyl group, etc. are substituted with halogen atoms, cyano groups, etc.
The organopolysiloxane is preferably an organopolysiloxane containing in one molecule at least two alkenyl groups bonded to silicon atoms. For example, in the above formula, it is preferable that at least two R have the above alkenyl group. The organopolysiloxane more preferably has vinyl groups.
Specific examples of the organopolysiloxane include dimethylpolysiloxane and diphenylpolysiloxane. The molecular chain ends of the organopolysiloxane are preferably blocked by trimethylsilyl, dimethylvinylsilyl, dimethylhydroxysilyl, trivinylsilyl, or the like.
The rubber composition may also contain various additives. Examples of such additives include: conductivity imparting agents, chain extenders and other auxiliaries, addition reaction catalysts and other catalysts, reaction control agents, dispersants, anti-aging agents, antioxidants, fillers, pigments, colorants, processing aids, softeners, plasticizers, emulsifiers, heat resistance improvers, flame retardancy improvers, acid absorbers, heat conductivity improvers, mold release agents, solvents and the like.
The rubber composition may be a liquid rubber composition or a kneaded rubber composition.
[ surface layer ]
The skin layer 4 is provided on the outermost surface of the elastic roller 1. In the present invention, the relative dielectric constant of the surface layer 4 is 1 to 10 at 100Hz, and 10 to 100 at 0.01 Hz. By adjusting the relative dielectric constants of the surface layer 4 at 100Hz and 0.01Hz within the above-described ranges, the mirror force and van der waals force of the binding force between the silica of the external additive material in the developer and the elastic roller surface can be reduced, and occurrence of filming can be well suppressed. The relative dielectric constant of the surface layer 4 is preferably 1 to 5 at 100Hz, and preferably 7 to 120 at 0.01 Hz.
In order to prevent film formation in the elastic roller 1, at least the properties of the surface layer 4 need to be adjusted. In the present invention, the surface layer 4 is formed by coating and curing a mixture of the following (a) component- (D) component.
(A) An adhesive base obtained by polymerizing a composition comprising both terminal-modified silicone oil and an isocyanate compound.
(B) A second isocyanate compound;
(C) Silicone rubber particles and/or acrylic acid particles having particle diameters of 0.2 μm or more and 10 μm or less
(D) Diluting the solvent.
In addition, the above mixture is in a liquid state before being thermally cured.
((A) adhesive base agent)
The adhesive main agent is obtained by polymerizing a composition containing both terminal-modified silicone oil and an isocyanate compound. The composition may further contain a fluororesin such as a single-terminal diol-modified silicone oil, a polyol, and a tetrafluoroethylene copolymer, if necessary.
(both terminal modified Silicone oil)
The both terminal-modified silicone oil is one of so-called reactive silicone oils, which has a property of polymerizing with an isocyanate compound. Therefore, the both terminal modified silicone oil is preferably modified at both terminals of the silicone chain with amino groups (primary amino groups or secondary amino groups), mercapto groups or hydroxyl groups. These both terminal modified silicone oils may be commercially available amino-modified silicone oils at both terminals, mercapto-modified silicone oils at both terminals, carboxyl-modified silicone oils at both terminals, phenol-modified silicone oils at both terminals, or methanol-modified silicone oils at both terminals.
Here, as a preferable both-end modified silicone oil used in the present invention, there is mentioned a both-end modified silicone oil represented by the following general formula (1).
[ chemical formula 1]
In the general formula (1), R represents-C 3 H 6 OC 2 H 4 OH, or-C 3 H 6 OCH 2 -C(CH 2 OH) 2 C 2 H 5 N represents an integer of 20 or less.
Of the both terminal-modified silicone oils represented by the general formula (1), it is particularly preferable to use a silicone oil wherein R at both terminals is-C 3 H 6 OC 2 H 4 Silicone oil of OH and n of about 10. For such silicone oils, commercially available silicone oils can be suitably obtained.
Further, in the general formula (1), although the functional group bonded to the silicon atom is a methyl group, the methyl group may be a both-terminal modified silicone oil substituted with a hydrogen atom.
By adding both end-modified silicone oil to the mixture for forming the surface layer 4, moderate elasticity can be imparted to the surface layer 4, and the electric characteristics of the surface layer 4 can be adjusted to reduce the relative dielectric constant of the surface layer 4, so that occurrence of film formation can be effectively suppressed.
(Single terminal diol-modified silicone oil)
Although the single-terminal glycol-modified silicone oil is reactive silicone oil as well as the both-terminal-modified silicone oil, it has two hydroxyl groups bonded to one terminal of the silicone chain. In general, when both terminal modified silicone oil and isocyanate compound are polymerized, linear polyurethane is produced, but by using the single terminal diol modified silicone oil in combination, a branch can be introduced in polyurethane, and the nano-scale fine roughness of the elastic roller 1 can be improved.
The single-terminal diol-modified silicone oil may be represented by the following general formula (2).
[ chemical formula 2]
In the general formula (2), R' represents-C 3 H 6 OCH 2 -C(CH 2 OH) 2 C 2 H 5 N represents an integer of 20 or less.
Among the single-terminal diol-modified silicone oils represented by the general formula (2), silicone oils having n of about 10 are particularly preferably used. Further, in the general formula (2), although the functional group bonded to the silicon atom is a methyl group, the methyl group may be a silicone oil substituted with a hydrogen atom.
In the present invention, the one-terminal diol-modified silicone oil used for preparing the adhesive main agent is preferably 1 part by mass or more and 5 parts by mass or less, more preferably 2 parts by mass or more and 4 parts by mass or less, relative to 100 parts by mass of the both-terminal modified silicone oil. By controlling the amount of the single-terminal glycol-modified silicone oil to be used with respect to the both-terminal-modified silicone oil within the above-described range, and by adjusting the surface roughness of the surface layer 4, film formation can be effectively prevented while maintaining good development performance.
(isocyanate Compound)
In the present invention, the isocyanate compound used as the main agent for preparing the adhesive is not particularly limited as long as it has reactivity with the reactive group introduced into the silicone oil, for example, diisocyanate such as diphenylmethane diisocyanate (MDI), toluene Diisocyanate (TDI) and Hexamethylene Diisocyanate (HDI), and adduct type, biuret type, isocyanurate type, allophanate type and the like as modified products of these isocyanates. Among these isocyanate compounds, isocyanurate-type isocyanate compounds and adduct-type isocyanate compounds are preferable, and they may be used alone or in combination. The longer the molecular chain of the isocyanate compound, the more flexible the polyurethane can be produced.
In the present invention, the isocyanate compound used for preparing the adhesive main agent is preferably 7.78 parts by mass or more and 23.30 parts by mass or less, more preferably 11.67 parts by mass or more and 19.45 parts by mass or less, relative to 100 parts by mass of the both terminal-modified silicone oil. By making the amount of the isocyanate compound used with respect to the both terminal modified silicone oil within the above range, the viscosity of the mixture for forming the surface layer 4 can be made appropriate, and thus the workability can be improved.
(carbonate polyol, hydrogenated butadiene polyol, fluorine polyol)
The carbonate polyol, the fluorine polyol and the hydrogenated butadiene polyol are those which react with the above-mentioned isocyanate compound or a second isocyanate compound described later to form polyurethane. In the present invention, these polyols may be used alone or two or more polyols may be used in combination. As the polyol used, carbonate polyol and fluorine polyol are preferably used alone or in combination.
The carbonate polyol and/or the fluorine polyol is preferably 5 parts by mass or more and 40 parts by mass or less, more preferably 15 parts by mass or more and 25 parts by mass or less, relative to 100 parts by mass of the both terminal-modified silicone oil. As these polyols, commercially available polyols can be used.
((B) second isocyanate Compound)
As the isocyanate compound, various isocyanate compounds (for example, aromatic isocyanate compounds, aliphatic isocyanate compounds, and alicyclic isocyanate compounds) generally used for producing polyurethane can be used. Examples of the aromatic isocyanate compound include: 2, 4-toluene diisocyanate (2, 4-TDI), 2, 6-toluene diisocyanate (2, 6-TDI), 4 '-diphenylmethane diisocyanate (4, 4' -MDI), 2,4 '-diphenylmethane diisocyanate (2, 4' -MDI), 1, 4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, dimethylbiphenyl diisocyanate (TODI), 1, 5-Naphthalene Diisocyanate (NDI), 3 '-dimethylbiphenyl-4, 4' -diisocyanate, and the like. Examples of the aliphatic isocyanate compound include: hexamethylene Diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMHDI), lysine diisocyanate, norbornene diisocyanate methyl (NBDI), xylene Diisocyanate (XDI), tetramethylxylene diisocyanate (TMXDI), and the like. Further, examples of the alicyclic polyisocyanate include: trans-cyclohexane-1, 4-diisocyanate, isophorone diisocyanate (IPDI), H6XDI (hydrogenated XDI), H12MDI (hydrogenated MDI), 4' -dicyclohexylmethane diisocyanate, and the like.
In the present invention, the amount of the second isocyanate compound used in the mixed solution used for forming the surface layer 4 is such that the reaction rate of the second isocyanate compound is 80% to 126%, preferably 95% to 112%.
((C) Silicone rubber particles, acrylic particles)
The mixed liquid for forming the surface layer 4 contains silicone rubber particles and/or acrylic acid particles. The particle diameters of the silicone rubber particles and the acrylic particles are preferably 0.2 μm or more and 10 μm or less, more preferably 0.8 μm or more and 5 μm or less. By making the particle diameters of the silicone rubber particles and the acrylic particles within the above-described range, the surface roughness of the elastic roller 1 can be appropriately maintained, the conveyability of the developer is kept good, and the resolution is kept at a high level, so that deterioration of image quality can be prevented. The particle diameters of the silicone rubber particles and the acrylic particles can be measured by observing the cross section with a microscope after the treatment of cutting the elastic roller 1.
The silicone rubber particles and acrylic particles used in the present invention preferably have heat resistance that does not deform or melt or the like even at temperatures of 100 ℃ or higher, more preferably have heat resistance at 130 ℃ to 180 ℃. Accordingly, deformation of these silicone rubber particles and acrylic particles can be prevented even at the crosslinking temperature of the surface layer 4. The heat resistance of the silicone rubber particles and the acrylic particles can be evaluated by confirming that the silicone rubber particles and the acrylic particles do not melt and flow out when pressure and heat are applied in the melt flow indexer.
The hardness of the silicone rubber particles and the acrylic particles is preferably 20 degrees or more and 80 degrees or less, more preferably 50 degrees or more and 75 degrees or less, as measured by a durometer A (transient) (JIS K6253:1997). When the hardness of the silicone rubber particles and the acrylic particles is within the above-described range, the rise in the friction coefficient of the surface layer 4 and the occurrence of adhesion due to the breakage or deformation of the silicone rubber particles and the acrylic particles can be effectively prevented, and the occurrence of cracks or breaks in the surface layer 4 due to an excessive increase in the hardness of the surface layer 4 can be prevented, and also the application of excessive stress to the toner can be prevented.
Silicone rubber particles and acrylic particles may be present (buried) in the surface layer 4, and a part of them may also protrude to the surface of the surface layer 4. In addition, they may be unevenly dispersed in the surface layer 4 or unevenly distributed on the surface side of the surface layer 4.
Among the silicone rubber particles and acrylic particles, those having a structure in which organopolysiloxane, such as dimethylpolysiloxane, or polyorganosilsesquioxane is crosslinked are preferable, and commercially available acrylic particles can be used as the acrylic particles.
Further, regarding the silicone rubber particles, it is preferable to prepare from an organopolysiloxane or an organopolysiloxane having one or two or more monovalent organic groups having 1 to 20 carbon atoms selected from the following organic groups containing a reactive group such as: alkyl groups such as methyl, ethyl, propyl, butyl, etc.; aryl groups such as phenyl and tolyl; alkenyl groups such as vinyl and allyl; aralkyl groups such as beta-phenylethyl and beta-phenylpropyl; monovalent halogenated hydrocarbon groups such as chloromethyl, 3-trifluoropropyl, etc.; epoxy, amino, mercapto, acryloyloxy, methacryloyloxy, and the like; these particles prepared from organopolysiloxanes or organopolysilsesquioxanes can also be surface-treated with organoalkoxysilanes. As such silicone rubber particles, for example, "KMP-597" manufactured by Xinyue chemical industry Co., ltd., or "EP-5500", "EP-2600", "EP-2601", "E-2720", "DY 33-430M", "EP-2720", "EP-9215Cosmetic Power", "9701Cosmetic Power" manufactured by Touretanning Co., ltd, etc. can be used.
The amount of the silicone rubber particles and/or the acrylic particles used is preferably 15 parts by mass or more and 40 parts by mass or less, more preferably 20 parts by mass or more and 35 parts by mass or less, relative to 100 parts by mass of the binder main agent. By setting the amount of use of the silicone rubber particles and/or the acrylic particles within the above-described amount of use range, the surface roughness of the elastic roller 1 can be appropriately maintained, the conveyability of the developer is kept good, and the resolution is kept at a high level, so that deterioration of image quality can be prevented.
((D) dilution solvent)
As the dilution solvent, an aqueous solvent and an organic solvent may be used, and depending on the desired drying speed, a low boiling point solvent and a high boiling point solvent may be used in combination.
In the present invention, the solid content concentration in the mixture for forming the surface layer 4 is preferably in the range of 10 mass% or more and 50 mass% or less, more preferably in the range of 20 mass% or more and 40 mass% or less. If the solid content is low, liquid dripping easily occurs during coating, and the time required for drying is long, and if the solid content is high, the coated surface becomes rough, and it is difficult to control the thickness.
In the present invention, as the diluting solvent, a diluting solvent that swells the above-mentioned silicone rubber particles and acrylic acid particles is preferably used. Accordingly, the silicone rubber particles and the acrylic acid particles are swelled in the mixed liquid, the surface layer 4 can be made free from repulsion and dishing, and sedimentation of the silicone rubber particles and the acrylic acid particles in the mixed liquid can be suppressed.
As such a diluting solvent, an organic solvent such as Methyl Ethyl Ketone (MEK), methyl isobutyl ketone (MIBK), tetrahydrofuran (THF), acetone, ethyl acetate, butyl acetate, toluene, xylene, heptane, cyclohexanone, isophorone, or the like is preferably used.
[ adhesive layer ]
The elastic roller 1 of the present invention includes an adhesive layer between the shaft body 2 and the elastic layer 3, and between the elastic layer 3 and the surface layer 4. Here, in particular, with respect to the adhesive layer provided between the elastic layer 3 and the surface layer 4, the electrical characteristics of the elastic roller 1 can be adjusted by adjusting the electrical characteristics of the adhesive layer, whereby the developing performance of the elastic roller 1 as a developing roller can be well adjusted.
In the elastic roller 1 of the present invention, the relative dielectric constant of the adhesive layer is 1 to 10 at 100Hz, and 1000 to 10000 at 0.01 Hz. By adjusting the relative permittivity of the adhesive layer to be within this range, even if the relative permittivity of the surface layer is adjusted to be low in order to well suppress occurrence of film formation, the capacitance for carrying or supplying the developer can be ensured, and the developer can be stably charged. Therefore, a decrease in print density at the time of printing can be suppressed. The relative dielectric constant of the adhesive layer is preferably 4.0 to 10.0 at 100Hz, and preferably 2000 to 5000 at 0.01 Hz.
The adhesive layer preferably contains an organic titanium compound and/or an organic zirconium compound, more preferably contains these organic metal compounds and a silane coupling agent. By using the organic titanium compound, the organic zirconium compound, and the silane coupling agent in combination, the relative dielectric constant of the elastic layer 3 is improved to maintain good developing performance, and good adhesion between the elastic layer 3 and the surface layer 4 can be maintained. As the organic titanium compound, there can be mentioned: examples of the organic zirconium compound include an alkoxy group-containing titanium compound, a titanium chelate compound, and the like: zirconium compounds containing alkoxy groups, zirconium chelate compounds, and the like. As these organotitanium compounds and organozirconium compounds, commercially available organotitanium compounds and organozirconium compounds can be suitably used.
Examples
The present invention will be described in detail with reference to examples. Furthermore, the present invention is not limited to the embodiments shown below.
< preparation of adhesive base agent >
The materials shown below were mixed to prepare a composition for preparing an adhesive host, and the composition was maintained at a temperature of 100 to 120 ℃ for 4 to 6 hours to prepare an adhesive host. The detailed formulation ratios in preparing the compositions for preparing the adhesive base are shown in table 1.
[ (A) composition for preparing adhesive base agent ]
(A1) Dimethicone modified by hydroxy at two ends
(A2) Single-terminal diol modified silicone oil
(A3) Carbonic acid diol
(A4) Tetrafluoroethylene copolymer polyol
(A5) Polyester polyol
(A6) Isocyanate compound (adduct type isocyanate)
(A7) Isocyanate compound (isocyanurate type isocyanate)
TABLE 1
| Adhesive base agent | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | Example 9 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| (A1) | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | - | 100.00 | 100.00 |
| (A2) | - | - | - | - | - | 3.00 | - | - | - | - | - | - |
| (A3) | - | - | - | - | - | - | - | 25.00 | - | - | - | - |
| (A4) | - | - | - | - | - | - | - | - | 25.00 | - | - | - |
| (A5) | - | - | - | - | - | - | - | - | - | 100.00 | 25.00 | 25.00 |
| (A6) | 49.23 | 49.23 | - | - | - | - | - | - | - | - | - | 54.98 |
| (A7) | - | - | 15.56 | 15.56 | 15.56 | 15.69 | 15.56 | 20.10 | 16.82 | - | 17.37 | - |
< preparation of Mixed solution for Forming surface layer >
A mixed solution for forming the surface layer was prepared by mixing the binder base with each of the following materials. The detailed formulation ratios in the preparation of the mixed solution are shown in table 2.
[ (B) second isocyanate Compound ]
(B1) Isocyanurate type isocyanate
(B2) Adducts type isocyanates
[ (C) Silicone rubber particles, acrylic particles ]
(C1) Silicone rubber beads (average particle size 2 μm).
(C2) Acrylic fine particles (average particle diameter of 3 μm) having high recovery.
(C3) Acrylic fine particles (average particle diameter 10 μm) having high recovery.
[ (D) dilution solvent ]
(D1) Butyl acetate
< adhesive layer >
(E1) Silane coupling agent
(E2) Organic titanium Compound (titanium oligomer)
(E3) Organozirconium compound (zirconium tributoxy monoacetylacetonate)
< examples and comparative examples; production of developing roller-
A silicone primer was applied to the surface of a shaft body (diameter 7.5mm, length 274.1 mm) composed of a free-cutting steel SUM23, and then dried in a gear oven at a temperature of 150 ℃. By this operation, the outer peripheral surface of the shaft body is subjected to primer treatment.
An elastomer made of a rubber material is formed on the outer peripheral surface of the shaft body by extrusion molding using a rubber composition made of silicone rubber. Further, in the extrusion molding, a rubber composition formed of a silicone rubber was heated at 360℃for 5 minutes using an infrared heating furnace (IR furnace), and further heated at 200℃for 4 hours using a gear oven to cure it. Accordingly, an elastic layer composed of a cured product of the rubber composition is formed on the outer peripheral surface of the shaft body subjected to the primer treatment. The elastic layer is a solid layer, and the thickness of the elastic layer is 4.25mm. Further, the resistance value of the elastic layer was measured using R8340 ULTRA HIGH RESISTANCE METER (manufactured by ADVANTTEST Co., ltd.) and found to be 1.00X 10 5 Ω。
Next, the outer peripheral surface of the elastic layer is subjected to UV treatment. Then, according to each category of examples and comparative examples, the adhesive primer layer shown in table 2 was coated on the UV-treated elastic layer, and then the mixed liquid shown in table 2 was coated on the elastic layer by a spray coating method. The surface layer is formed on the elastic layer by heating the coated mixed solution at 150-160 deg.c for 30 minutes. The thickness of the skin layer was 7. Mu.m.
< evaluation >
(measurement of print Density and film Forming amount)
The print density and the film formation amount of each of the produced developing rollers were measured as follows. The model of the image forming apparatus used was HL-L2360DN (manufactured by Brother industries Co., ltd.). As the developing rollers of the image forming apparatus, each of the manufactured developing rollers is mounted in the developing apparatus. Then, a solid image was formed under the conditions of a temperature of 23 ℃ and a humidity of 55%, and a print evaluation was confirmed. The film formation state after 4000 sheets were printed and the image quality (density gradient ratio between the initial print formation portion and the final print formation portion of solid printing) after 4000 sheets were printed were evaluated. The densitometry was performed using an X-Rite500 spectrodensitometer manufactured by X-Rite corporation.
Print density was evaluated according to the following evaluation criteria. In the present test, when the print density evaluation is a, it is qualified.
A: density gradient ratio of 96-100% and clean printed dot
B: the density gradient ratio is 92-95%, and other defects (rough printing points) are present
C: the density gradient ratio is 91% or less, and other defects are present
The adhesion (filming) of the toner was evaluated by the adhesion amount of the developer. Specifically, after 4000 sheets of paper were printed, the developer adsorbed on the surface of the developing roller was extracted, and the mass transferred to the film formation weight measuring jig was measured. Regarding the film formation evaluation, the evaluation was made based on the quality of the transferred developer according to the following criteria. In this test, the film formation amount was evaluated as A or B, and was qualified.
A:0mg or more and 0.003mg or less
B: more than 0.003mg and less than 0.006mg
C: more than 0.006mg
(measurement of relative permittivity)
For the surface layer and the adhesive layer in the manufactured development roller, relative dielectric constants at 0.01Hz and 100Hz were measured using an LCR meter (manufactured by NF circuit design block co. (NF Circuit Design Block co., ltd.)).
The evaluation results are shown in Table 2.
TABLE 2
/>
Claims (4)
1. An elastic roller is provided with:
a shaft body;
an elastic layer disposed on an outer circumferential surface of the shaft body; and
a surface layer disposed outside the elastic layer;
the elastic roller is provided with an adhesive layer between the elastic layer and the surface layer,
the elasticity isThe resistance value of the layer is 1×10 4 Omega or more and 1X 10 6 The temperature of the liquid crystal display panel is lower than or equal to omega,
the relative dielectric constant of the adhesive layer is 1 to 10 at 100Hz, 1000 to 10000 at 0.01Hz,
the surface layer has a relative dielectric constant of 1 to 10 at 100Hz and 10 to 200 at 0.01 Hz.
2. The elastic roller according to claim 1, wherein,
the adhesive layer contains an organic titanium compound and/or an organic zirconium compound.
3. The elastic roll according to claim 1 or 2, wherein,
the surface layer is formed by adding silicone rubber particles and/or acrylic acid particles of 2-10 [ mu ] m and a second isocyanate compound to an adhesive main agent and curing the mixture;
the adhesive main agent is obtained by mixing an isocyanurate type isocyanate compound and/or an adduct type isocyanate compound in both end-modified silicone oils and reacting them.
4. An elastic roll according to any one of claims 1 to 3, wherein,
the surface layer is formed by adding silicone rubber particles and/or acrylic acid particles of 2-10 [ mu ] m and a second isocyanate compound to an adhesive main agent and curing the mixture;
the adhesive main agent is obtained by mixing carbonate polyol and/or fluorine polyol in both end-modified silicone oil, and further mixing isocyanurate type isocyanate compound and/or adduct type isocyanate compound, and reacting them.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-217629 | 2018-11-20 | ||
| JP2018217629A JP7099676B2 (en) | 2018-11-20 | 2018-11-20 | Elastic roller |
| PCT/JP2019/044119 WO2020105489A1 (en) | 2018-11-20 | 2019-11-11 | Elastic roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112543894A CN112543894A (en) | 2021-03-23 |
| CN112543894B true CN112543894B (en) | 2023-09-05 |
Family
ID=70773430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980052921.3A Active CN112543894B (en) | 2018-11-20 | 2019-11-11 | elastic roller |
Country Status (3)
| Country | Link |
|---|---|
| JP (2) | JP7099676B2 (en) |
| CN (1) | CN112543894B (en) |
| WO (1) | WO2020105489A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09269651A (en) * | 1996-03-29 | 1997-10-14 | Bridgestone Corp | Developing roller and developing device |
| JP2002072699A (en) * | 2000-08-31 | 2002-03-12 | Tokai Rubber Ind Ltd | Intermediate transfer belt |
| JP2004138810A (en) * | 2002-10-17 | 2004-05-13 | Kanegafuchi Chem Ind Co Ltd | Conductive roller |
| JP2016035528A (en) * | 2014-08-04 | 2016-03-17 | キヤノン株式会社 | Charging member, process cartridge and electrophotographic device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000321862A (en) | 1999-05-12 | 2000-11-24 | Canon Inc | Developing roller and developing device |
| JP2004347729A (en) * | 2003-05-20 | 2004-12-09 | Kanegafuchi Chem Ind Co Ltd | Method for manufacturing conductive roller |
| JP4847683B2 (en) | 2004-03-09 | 2011-12-28 | 住友ゴム工業株式会社 | Manufacturing method of conductive foam roller and image forming apparatus using the same |
| JP5085030B2 (en) | 2004-12-24 | 2012-11-28 | 東海ゴム工業株式会社 | Developing roll and its production method |
| JP4738937B2 (en) | 2005-08-05 | 2011-08-03 | 株式会社カネカ | Elastic roller for electrophotography |
| JP5351711B2 (en) * | 2009-10-28 | 2013-11-27 | 株式会社沖データ | Developing device and image forming apparatus |
| JP6169464B2 (en) * | 2013-09-30 | 2017-07-26 | 信越ポリマー株式会社 | Developing roller, developing device, and image forming apparatus |
| JP6265695B2 (en) * | 2013-11-13 | 2018-01-24 | キヤノン株式会社 | Image forming apparatus |
| JP6617479B2 (en) | 2014-09-29 | 2019-12-11 | 東ソー株式会社 | Mold release agent composition used for resin molding, and polyurethane resin molded product molded using this mold release agent |
| US20170329261A1 (en) * | 2014-10-31 | 2017-11-16 | Hewlett-Packard Indigo B.V. | Electrostatic printing apparatus and intermediate transfer members |
-
2018
- 2018-11-20 JP JP2018217629A patent/JP7099676B2/en active Active
-
2019
- 2019-11-11 CN CN201980052921.3A patent/CN112543894B/en active Active
- 2019-11-11 WO PCT/JP2019/044119 patent/WO2020105489A1/en active Application Filing
-
2022
- 2022-06-17 JP JP2022098396A patent/JP7340071B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09269651A (en) * | 1996-03-29 | 1997-10-14 | Bridgestone Corp | Developing roller and developing device |
| JP2002072699A (en) * | 2000-08-31 | 2002-03-12 | Tokai Rubber Ind Ltd | Intermediate transfer belt |
| JP2004138810A (en) * | 2002-10-17 | 2004-05-13 | Kanegafuchi Chem Ind Co Ltd | Conductive roller |
| JP2016035528A (en) * | 2014-08-04 | 2016-03-17 | キヤノン株式会社 | Charging member, process cartridge and electrophotographic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7340071B2 (en) | 2023-09-06 |
| WO2020105489A1 (en) | 2020-05-28 |
| JP2022121506A (en) | 2022-08-19 |
| CN112543894A (en) | 2021-03-23 |
| JP7099676B2 (en) | 2022-07-12 |
| JP2020086038A (en) | 2020-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107045272B (en) | Electrophotographic member, process cartridge, electrophotographic apparatus, and method of manufacturing electrophotographic member | |
| EP2463722B1 (en) | Electrically conductive roller and image formation device | |
| EP2667258B1 (en) | Developing roller, developing device, and image formation device | |
| JP2011118113A (en) | Conductive roller and image forming apparatus | |
| JP6616697B2 (en) | Developing roller, developing device, and image forming apparatus | |
| JP2022071172A (en) | Developing roller and manufacturing method therefor | |
| JP5182920B2 (en) | Elastic roller, fixing device for image forming apparatus, and image forming apparatus | |
| CN112740112B (en) | Elastic roller | |
| CN112543894B (en) | elastic roller | |
| JP2009204875A (en) | Developing roll for electrophotographic apparatus | |
| JP2016099527A (en) | Developing roller, developing device, and image forming apparatus | |
| JP7422022B2 (en) | developing roller | |
| WO2022044461A1 (en) | Developing roller | |
| JP4803771B1 (en) | Developing roller, developing device, and image forming apparatus | |
| JP4965224B2 (en) | Method for producing polyurethane foam | |
| JP7297652B2 (en) | Developing roller, developing device and image forming device | |
| JP6926375B2 (en) | Developing rollers, developing equipment and image forming equipment | |
| JP2019095656A (en) | Developing roller, method for manufacturing developing roller, developing device, and image forming device | |
| JP7444675B2 (en) | Developing roller and image forming device | |
| JP7422006B2 (en) | Developing roller and image forming device | |
| JP2007316200A (en) | Conductive roller | |
| JP2020197548A (en) | Developing roller and image forming apparatus | |
| JP2019168614A (en) | Developing roller, developing device, and image forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |