CN102645867B - Electrified Roller Used For Electric Camera Device - Google Patents
Electrified Roller Used For Electric Camera Device Download PDFInfo
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- CN102645867B CN102645867B CN201210034247.6A CN201210034247A CN102645867B CN 102645867 B CN102645867 B CN 102645867B CN 201210034247 A CN201210034247 A CN 201210034247A CN 102645867 B CN102645867 B CN 102645867B
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Abstract
A kind of electrified Roller Used For Electric Camera Device is provided, even if it reduces the applying voltage to charged roller, also can suppresses to produce image abnormity under low temperature and low humidity environment.Electrified Roller Used For Electric Camera Device of the present invention (10) possesses axis body (12), be formed at the conductive elastomer layer (14) of axis body (12) periphery, and be formed at the top layer (16) of elastomer layer (14) periphery, elastomer layer (14) is by relative to ionic conductivity rubber 100 weight portion be made up of the one kind or two or more rubber being selected from epichlorohydrin rubber and nitrile rubber, the crosslinked of the rubber composition containing peroxide cross-linking agent 1.3 weight portion ~ 1.6 weight portion is formed, top layer (16) is by relative to N-methoxymethylated nylon 100 weight portion, containing water soluble ion conductive agent 0.5 weight portion ~ 4.0 weight portion, the resin combination of conductive tin oxide 44 weight portion ~ 84 weight portion is formed.
Description
Technical field
The present invention relates to the electrified Roller Used For Electric Camera Device for making the image carriers such as photosensitive drums charged in a kind of electronic photographing device such as duplicating machine, printer, facsimile recorder adopting electrofax mode.
Background technology
In the electronic photographing device such as duplicating machine, printer, facsimile recorder adopting electrofax mode, extensively adopt and the surface of the image carriers such as charged roller and photosensitive drums is directly contacted and the contact electrification mode that makes the surface of image carrier charged.
The structure of charged roller there will be a known following structure etc.: form the conductive elastomer layer formed by rubber composition in the periphery of axis body, forms the middle layer of the resistance of adjustment charged roller etc. as required and/or protect the top layer on roller surface etc. in the periphery of elastomer layer.
The charged roller of this kind of electronic photographing device requires that elastomer layer is soft, to guarantee the excellent contact with image carrier.Further, require that the resistance to ag(e)ing of elastomer layer is excellent, to guarantee excellent elastic recovery after contacting with image carrier.And, require that the resistance on roller surface is even, to make the surface uniform of image carrier charged.
In order to tackle this kind of requirement, such as, in patent document 1, describe the main material forming conductive elastomer layer use epichlorohydrin rubber or nitrile rubber plasma conducting rubber, and utilize peroxide cross-linking agent that main material is cross-linked.Further, the resin combination that the materials'use forming top layer contains N-methoxymethylated nylon and carbon black is described in patent document 1.
Patent document 1: Japanese Unexamined Patent Publication 2009-31758 publication
In recent years, in order to realize the cost degradation of electronic photographing device and suppress power consumption etc., the power supply using low-voltage is attempted.In such cases, require by utilizing charged roller to make image carrier suitably charged than previously lower voltage.
But, use existing charged roller, when applying voltage and being lower, produce sand-like spot or ghost image etc. sometimes at low temperature and low humidity environment hypograph abnormal.This kind of image abnormity can occur in image in the early stage especially significantly.
Summary of the invention
Even if problem to be solved by this invention is to provide the applying voltage reduced charged roller, the electrified Roller Used For Electric Camera Device producing image abnormity under low temperature and low humidity environment also can be suppressed.
In order to solve described problem, aim to provide electrified Roller Used For Electric Camera Device of the present invention, it possesses axis body, be formed at the conductive elastomer layer of described axis body periphery, and be formed at the top layer of described elastomer layer periphery, described elastomer layer is by relative to ionic conductivity rubber 100 weight portion be made up of the one kind or two or more rubber being selected from epichlorohydrin rubber and nitrile rubber, the crosslinked of the rubber composition containing peroxide cross-linking agent 1.3 weight portion ~ 1.6 weight portion is formed, described top layer is by relative N-methoxymethylated nylon 100 weight portion, containing water soluble ion conductive agent 0.5 weight portion ~ 4.0 weight portion, the resin combination of conductive tin oxide 44 weight portion ~ 84 weight portion is formed.
Preferably, described water soluble ion conductive agent is the one kind or two or more ionic conductive agent being selected from two trifyl imide li, tetraethyl phosphonium bromide and four ethyl phosphonium hydroxides.
Preferably, the specific insulation forming the resin combination on described top layer is 1.0 × 10
10below Ω cm.
Preferably, the relative dielectric constant forming the resin combination on described top layer is more than 200.
In addition, preferably, the rubber composition forming described elastomer layer contains conductive agent, and described conductive agent is ionic conductive agent.
Electrified Roller Used For Electric Camera Device of the present invention, at conductive elastomer layer by relative to ionic conductivity rubber 100 weight portion be made up of the one kind or two or more rubber being selected from epichlorohydrin rubber and nitrile rubber, when the crosslinked of the rubber composition containing peroxide cross-linking agent 1.3 weight portion ~ 1.6 weight portion is formed, top layer is formed by the resin combination containing water soluble ion conductive agent 0.5 weight portion ~ 4.0 weight portion and conductive tin oxide 44 weight portion ~ 84 weight portion relative to N-methoxymethylated nylon 100 weight portion.Therefore, evenly and be low resistance, and the specific inductive capacity on top layer is high for the resistance on top layer.Because top layer is low resistance, therefore electrical response performance is good.In addition, because top layer is low resistance and the specific inductive capacity on top layer is higher, the quantity of electric charge (carried charge) being therefore stored in top layer is many.Thus, even if reduce the applying voltage to charged roller, under low temperature and low humidity environment, from initial stage image, also just can suppress the image abnormity of sand-like spot or ghost image etc., obtain good image.
Here, contain conductive agent at the rubber composition forming elastomer layer, and when conductive agent is ionic conductive agent, that is, when this rubber composition does not allocate the electronic conductors such as carbon black, particularly under low temperature and low humidity environment, easily produce this kind of image abnormity.In such cases, only improve elastomer layer and be difficult to removal of images extremely.Therefore, in such cases, particularly meaningful to the described problem of solution by improvement top layer.
Accompanying drawing explanation
Fig. 1 is the circumferencial direction sectional view of the charged roller of one embodiment of the present invention.
Fig. 2 is the figure of the detection method that carried charge is described.
Fig. 3 is table 1, represents allotment ratio and the specific insulation of top layer resin combination, the testing result of relative dielectric constant of top layer resin combination.
Fig. 4 is table 2, represents allotment ratio and the specific insulation of top layer resin combination, the testing result of relative dielectric constant of top layer resin combination.
Fig. 5 is table 3, represents evaluation during elastomer layer use rubber composition (1) (NBR).
Fig. 6 is table 4, represents evaluation during elastomer layer use rubber composition (2) (epichlorohydrin rubber).
Embodiment
Electrified Roller Used For Electric Camera Device of the present invention (hereinafter sometimes referred to charged roller) is described in detail.
Fig. 1 is the circumferencial direction sectional view of the charged roller about one embodiment of the present invention.As shown in Figure 1, charged roller 10 has axis body 12, is formed at the conductive elastomer layer 14 of axis body 12 periphery and is formed at the top layer 16 of elastomer layer 14 periphery.
Then be not particularly limited as long as axis body 12 has electric conductivity.The material forming axis body 12 can enumerate the metal that iron, stainless steel, aluminium etc. have electric conductivity.The shape of axis body 12 can enumerate solid bar-shaped (solid), hollow tubular (hollow body) etc.The surface of axis body 12 can be coated with sticker, silane coupling agent etc. as required.Sticker, silane coupling agent etc. can carry out conduction as required.
Elastomer layer 14 is formed by the crosslinked of specific rubber composition.Specific rubber composition is formed by the composition comprising ionic conductivity rubber and peroxide cross-linking agent.Ionic conductivity rubber can enumerate epichlorohydrin rubber, nitrile rubber (NBR).Ionic conductivity rubber can only be formed by 1 in these rubber kind, also can be formed by the rubber two or more combined.
Epichlorohydrin rubber can enumerate the homopolymer (CO), chloropropylene oxide-oxirane bipolymer (ECO), chloropropylene oxide-allyl glycidyl ether bipolymer (GCO), chloropropylene oxide-oxirane-allyl glycidyl ether terpolymer (GECO) etc. of chloropropylene oxide.
In epichlorohydrin rubber, chloropropylene oxide-oxirane bipolymer (ECO) more easily obtain low resistance body in better than the homopolymer (CO) of chloropropylene oxide.In addition, because chloropropylene oxide-allyl glycidyl ether bipolymer (GCO), chloropropylene oxide-oxirane-allyl glycidyl ether terpolymer (GECO) have double bond, therefore from the viewpoint of passing through easily to improve the better of elastic recovery (resistance to ag(e)ing) at polymkeric substance interchain linkage.
Peroxide cross-linking agent may be used for the crosslinked of ionic conductivity rubber.Owing to using peroxide cross-linking agent instead of the sulphur that extensively adopted by the past as crosslinking chemical by ionic conductivity rubber cross, therefore the resistance to ag(e)ing of elastomer layer 14 is excellent.
Peroxide cross-linking agent can enumerate the peroxide cross-linking agent just known in the past such as ketal peroxide, dialkyl peroxide, peroxyester, ketone peroxide, peroxy dicarbonate, peroxidating two acyl, hydrogen peroxide.Peroxide cross-linking agent can only be formed by 1 in these peroxide cross-linking agents kind, also can be formed by the crosslinking chemical two or more combined.
Ketal peroxide can enumerate パ mono-ヘ キ サ HC, the パ mono-ヘ キ サ V, パ mono-ヘ キ サ C etc. that You She manufactures.Dialkyl peroxide can enumerate パ mono-ヘ キ サ 25B that You She manufactures, ペ ロ キ シ モ Application F, パ mono-Network ミ Le D, パ mono-Block チ Le C, パ mono-ヘ キ シ Le D, パ mono-Block チ Le D etc.Peroxyester can enumerate パ mono-Block チ Le E, パ that You She manufactures mono-Block チ Le I, パ mono-Block チ Le Z etc.
The content of peroxide cross-linking agent, relative to ionic conductivity rubber 100 weight portion, is set as in the scope of 1.3 weight portion ~ 1.6 weight portions.If the content of peroxide cross-linking agent is less than 1.3 weight portions, then may can not fully carry out by the crosslinked of ionic conductivity rubber, and the resistance to ag(e)ing of elastomer layer 14 is deteriorated.If the content of peroxide cross-linking agent is more than 1.6 weight portions, then may ionic conductivity rubber crosslinked excessively carrying out and the hardness of elastomer layer 14 becomes too high.In addition, the content of peroxide cross-linking agent, relative to ionic conductivity rubber 100 weight portion, is preferably 1.3 weight portions.
Ionic conductivity rubber shows ionic conductivity due to itself, and therefore specific insulation is relatively little, can reduce the resistance of specific rubber composition.Therefore, specific rubber composition can not contain conductive agent.In addition, specific rubber composition, according to required electric conductivity, also can contain conductive agent.When specific rubber composition contains conductive agent, conductive agent is preferably ionic conductive agent.That is, specific rubber composition is not preferably containing electronic conductors such as carbon blacks.When conductive agent is ionic conductive agent, because dispersiveness is in the composition excellent, be therefore difficult to produce resistance in elastomer layer 14 uneven.Therefore, the resistance of elastomer layer 14 and charged roller 10 is easily made to become even.
Elastomer layer 14 passes through the composition etc. of the specific rubber composition of adjustment, with specific insulation for 10
2Ω cm ~ 10
7the mode of Ω about cm is formed.
As long as ionic conductive agent mixed in specific rubber composition uses in electronic photographing device field, then be not particularly limited, as preferred ionic conductive agent, quaternary ammonium salt, quaternary alkylphosphonium salt, perchlorate, borate, interfacial agent etc. can be enumerated.Those conductive agents can be used alone, and also two or more can be combined and use.
Can illustrate as quaternary ammonium salt Huo quaternary alkylphosphonium salt: the alkyl or aryl (methyl, ethyl, propyl group, butyl, hexyl, octyl group, decyl, phenyl, xylyl etc.) with one kind or two or more carbon number about 1 ~ 18, and comprise halide ion, ClO
4 -, BF
4 -, SO
4 2-, HSO
4 -, C
2h
5sO
4 -, CF
3cOO
-, CF
3sO
3 -, (CF
3sO
2)
2n
-, PF
6 -, (CF
3cF
2sO
2)
2n
-, CF
3(CF
2)
3sO
3 -, (CF
3sO
2)
3c
-, CF
3(CF
2)
2cOO
-deng the quaternary ammonium salt Huo quaternary alkylphosphonium salt of negative ion.
Can illustrate as borate: the alkyl or aryl (methyl, ethyl, propyl group, butyl, hexyl, octyl group, decyl, phenyl, xylyl etc.) with one kind or two or more carbon number about 1 ~ 18, and comprise the borate of the alkali metal ions such as lithium ion, sodion, potassium ion, calcium ion or alkaline-earth metal ions.
More specifically; such as can enumerate: the quaternary ammonium salt such as tributyl ethyl ammonium sulfovinate, tetrabutyl ammonium halide (tetrabutylammonium chloride, tetrabutyl ammonium bromide, tetrabutylammonium iodide), tetrabutyl ammonium perchlorate; the quaternary alkylphosphonium salts such as two (trifyl) acid imides of tributyl Jia Ji Phosphonium; the perchlorate such as lithium perchlorate, potassium perchlorate, Organic Bor Complex etc.
The content of ionic conductive agent relative to ionic conductivity rubber 100 weight portion, in the scope of preferred 0.1 weight portion ~ 5 weight portion.In the scope of more preferably 0.2 weight portion ~ 3 weight portion, in the scope of preferred 0.3 weight portion ~ 2 weight portion further.
In specific rubber composition, not undermining in scope of the present invention, what can contain in the various adjuvants such as lubricant, antiaging agent, light stabilizer, viscosity modifier, processing aid, fire retardant, plasticiser, gas-development agent, filling agent, spreading agent, defoamer, pigment, release agent as required is one kind or two or more.
Elastomer layer 14 can use shaping dies pass through die forming and formed.Specifically can be formed in the following manner: at the hollow part of the shaping dies of drum, axis body 12 is set in the mode coaxial with shaping dies, after the hollow part of shaping dies injects the heating of specific rubber composition, sclerosis, carry out the demoulding.
Elastomer layer 14 is formed due to the crosslinked of planting specific rubber composition thus, is therefore soft and resistance to ag(e)ing is excellent.Therefore, suitable width of exerting pressure is guaranteed to image carriers such as photosensitive drums, and there is excellent contact.
Top layer 16 is formed by specific resin combination.Specific resin combination is formed by the composition containing N-methoxymethylated nylon and water soluble ion conductive agent and conductive tin oxide.
Water soluble ion conductive agent is the material mixed with the N-methoxymethylated nylon of the main material as specific resin combination.That is, easily mix equably with N-methoxymethylated nylon.Therefore, the dispersiveness of water soluble ion conductive agent in specific resin combination is excellent, can realize the homogenising of the resistance on top layer 16.
In specific resin combination, also can not use solvent and N-methoxymethylated nylon be mixed equably with water soluble ion conductive agent, but preferably use solvent these to be mixed equably.The solvent now used, due to reasons such as N-methoxymethylated nylon easily dissolve, is preferably aqueous solvent.Aqueous solvent can enumerate water, methyl alcohol, ethanol etc.These aqueous solvents can be used alone, and also two or more can be combined and use.
Water soluble ion conductive agent uses just meaningful in specific resin combination simultaneously with conductive tin oxide.If only merely reduce the resistance on top layer 16, then only allocate conductive tin oxide, and increase its content.But, if only allocate conductive tin oxide and excessively increase its content, then can produce the paradoxical discharges such as local over-discharge on roller surface.The image abnormity occurring horizontal stripe etc. on image may be produced thus.Its reason is inferred, the bad dispersibility of the tin oxide in specific resin combination, and local exists excessive part etc.Therefore, be used alone conductive tin oxide and can not play characteristic of the present invention.
On the other hand, when only allocating water soluble ion conductive agent not allocating conductive tin oxide, the resistance on top layer 16 cannot be reduced fully.That is, when only using water soluble ion conductive agent, the resistance on top layer 16 is higher.In such cases, under hot and humid environment, the resistance of elastomer layer 14 can reduce, and the voltage being therefore supplied to top layer 16 from elastomer layer 14 becomes excessive.Although water soluble ion conductive agent is dispersed excellent, the thickness due to top layer 16 exists uneven, therefore for overvoltage supply from elastomer layer 14, makes electric discharge cannot reach even in surface direction because of the thickness inequality on the higher top layer 16 of resistance.Therefore infer, the paradoxical discharges such as local over-discharge can be produced on roller surface.Particularly easily produce paradoxical discharge in the end (the axial end of roller) of wider width of exerting pressure.
By using water soluble ion conductive agent and conductive tin oxide simultaneously, the resistance on top layer 16 can be reduced fully.In addition, even if the thickness on top layer 16 exists uneven, also paradoxical discharge is difficult to.Its reason is inferred, tin oxide replaces becoming electrode layer and making electric discharge in surface direction homogenising.
Therefore, by using water soluble ion conductive agent and conductive tin oxide simultaneously, so that the structure of this kind of paradoxical discharge can not be produced, make the resistance on top layer 16 reach even and low resistance.By reducing the resistance on top layer 16 fully, the electrical response performance on top layer 16 becomes good.Namely soon charged.
In addition, during using top layer 16 as dielectric, being in proportion of polarization of dielectric amount and relative dielectric constant.In other words, the rising of polarization of dielectric rate can be related to the rising of dielectric specific inductive capacity.Water soluble ion conductive agent of the present invention, because being ionic polarization, polarizability is high.By also using water soluble ion conductive agent in conductive tin oxide, because the polarization caused by tin oxide superposing the higher ionic polarization of polarizability, therefore polarization of dielectric rate rises.Thus, the specific inductive capacity on top layer 16 (dielectric) rises.Because the specific inductive capacity on top layer 16 (dielectric) rises, the quantity of electric charge (capacity) being thus stored in top layer 16 increases.
Like this, if the quantity of electric charge being stored in top layer 16 increases, and the charged quickening on top layer 16, then the first lap (from initial startup) that can rotate from photosensitive drums, charged roller 10 pairs of photosensitive drums are discharged with high power-discharging density.Thus, enclose from first of photosensitive drums rotation, the response of photosensitive drums improves, and the carried charge of photosensitive drums also increases.Therefore, even if reduce applying voltage to charged roller 10, under low temperature and low humidity environment, be also difficult to produce the image abnormity of the sand-like spot caused because of carried charge deficiency etc.
In addition, if the carried charge of the first lap photosensitive drums rotated in photosensitive drums is not enough, then and photosensitive drums rotate second enclose between the difference of carried charge become large.Therefore, electric charge is easily produced uneven.That is, the carried charge easily produced between lettering portion and non-printing portion is poor.Thus, lettering portion can become ghost image.
For this phenomenon, by using water soluble ion conductive agent and conductive tin oxide simultaneously, the first carried charge enclosing photosensitive drums rotated from photosensitive drums rises, therefore, it is possible to reduce first lap and second that photosensitive drums rotates enclose between the difference of carried charge.In addition, even if reduce the applying voltage to charged roller 10, the carried charge of the first lap that photosensitive drums rotates can also fully be guaranteed.Therefore, even if reduce the applying voltage to charged roller 10, be also difficult to produce ghost image as above under low temperature and low humidity environment.Particularly when the main material of elastomer layer 14 uses nitrile rubber, because elastomer layer 14 becomes high resistance comparatively speaking, therefore easily produce ghost image.When using this kind of nitrile rubber, particularly suppress the excellent effect that ghost image produces.
The content of water soluble ion conductive agent, relative to N-methoxymethylated nylon 100 weight portion, is set as 0.5 weight portion ~ 4.0 weight portion.If the content of water soluble ion conductive agent is less than 0.5 weight portion, then the resistance on top layer 16 can not sufficient decent, therefore when reducing the applying voltage to charged roller 10, easily produces image abnormity.If the content of water soluble ion conductive agent is more than 4.0 weight portions, then water soluble ion conductive agent easily oozes out.Particularly easily ooze out under hot and humid environment.The content of water soluble ion conductive agent relative to N-methoxymethylated nylon 100 weight portion, in the scope of more preferably 0.5 weight portion ~ 2 weight portion.
Water soluble ion conductive agent can be enumerated: two trifyl imide li, tetraethyl phosphonium bromide, four ethyl phosphonium hydroxides.These ionic conductive agents are by force ionic, and because of the polarizability caused by ionic polarization high.Therefore, described excellent effect.
The content of conductive tin oxide, relative to N-methoxymethylated nylon 100 weight portion, is set as 44 weight portion ~ 84 weight portions.If the content of conductive tin oxide is less than 44 weight portions, then the resistance on top layer 16 can not sufficient decent, therefore when reducing the applying voltage to charged roller 10, easily produces image abnormity.If the content of conductive tin oxide is more than 84 weight portions, then can produce the paradoxical discharges such as local over-discharge on roller surface.Thus, the image abnormity occurring horizontal stripe etc. on image may be produced.The content of conductive tin oxide relative to N-methoxymethylated nylon 100 weight portion, in the scope of more preferably 54 weight portion ~ 74 weight portions.
Specific resin combination is by containing water soluble ion conductive agent and conductive tin oxide, and adjusting becomes low resistance.Specifically, preferably the specific insulation of specific resin combination is set as 1.0 × 10
10below Ω cm.Be more preferably 1.0 × 10
9below Ω cm, more preferably 1.0 × 10
8below Ω cm.The lower limit of the specific insulation of specific resin combination is not particularly limited, and from the viewpoint guaranteeing semiconduction etc., is preferably 1.0 × 10
3more than Ω cm, is more preferably 1.0 × 10
4more than Ω cm, more preferably 1.0 × 10
5more than Ω cm.
The specific insulation of specific resin combination can use and be configured as sheet and the sheet sample that obtains, according to JIS (Japanese Industrial Standards, Japanese Industrial Standards) K 6911 23 DEG C, detect under 53%RH environment.
In addition, specific resin combination is by containing water soluble ion conductive agent and conductive tin oxide, and adjusting becomes high-k.Specifically, preferably the relative dielectric constant of specific resin combination is set as more than 200.Be more preferably more than 220, more preferably more than 230.The higher limit of the relative dielectric constant of specific resin combination is not particularly limited, and from the viewpoint suppressing over-discharge etc., is preferably less than 4000, is more preferably less than 2000, and more preferably less than 1000.
The relative dielectric constant of specific resin combination is same with the detection of specific insulation, can use to be configured as sheet and the sheet sample obtained carries out.Specifically, can according to JIS K6911,23 DEG C, relative dielectric constant when to detect frequency be 1kHz is detected under 53%RH environment.
In specific resin combination, not hindering in scope of the present invention, what can contain in the various adjuvants such as lubricant, antiaging agent, light stabilizer, viscosity modifier, processing aid, fire retardant, plasticiser, spreading agent, defoamer, pigment, release agent as required is one kind or two or more.
The thickness on top layer 16 is not particularly limited, and is preferably in the scope of 0.01 μm ~ 100 μm, is more preferably in the scope of 0.1 μm ~ 20 μm, in the scope of more preferably 0.3 μm ~ 10 μm.
Top layer 16 can be formed by the method for the periphery coating top layer 16 formation composition at elastomer layer 14 etc.Coating process can be applied: the various coating processes such as rolling method, infusion process, spraying process.Ultraviolet radiation or thermal treatment can be carried out as required in the top layer 16 be coated with.
Charged roller 10 between elastomer layer 14 and top layer 16 in order to adjusting resistance, prevent from spreading, adhesion etc., middle layer can be had, also can not have middle layer.In the structure with middle layer, middle layer can use conductive rubber composition or resin combination to be formed.
[embodiment]
Below, the present invention is described in detail to use embodiment.
The < elastomer layer preparation > of rubber composition (1)
By utilizing stirring machine using nitrile rubber (manufacture of Japanese ゼ オ Application society, ニ Port one Le 3335) 100 weight portions, peroxide cross-linking agent (manufacture of You society, パ mono-Network ミ Le D) 1.3 weight portions, stearic acid 1.0 weight portion, zinc paste 5.0 weight portion, stirring as quaternary ammonium salt 1.0 weight portion of ionic conductive agent, mix, and prepare elastomer layer rubber composition (1).
The < elastomer layer preparation > of rubber composition (2)
By utilizing stirring machine using epichlorohydrin rubber (ダ イ ソ mono-society manufacture, エ ピ Network ロ マ mono-CG102) 100 weight portions, peroxide cross-linking agent (You society manufactures, パ mono-Network ミ Le D) 1.3 weight portions, stearic acid 0.7 weight portion, zinc paste 5.0 weight portion, hydrotalcite (Association and chemical industry society manufacture, DHT4A) 2.0 weight portions, stirring as quaternary ammonium salt 0.3 weight portion of ionic conductive agent, mix, and prepare elastomer layer rubber composition (2).
The preparation > of < top layer resin combination
By relative to N-methoxymethylated nylon 100 weight portion, aqueous solvent, (weight ratio is water: methyl alcohol=1: 1) 300 weight portions, allotment specified amount of water insoluble ionic conductive agent, conductive tin oxide, preparation top layer resin combination.The allotment amount (weight portion) of the kind of water soluble ion conductive agent and allotment amount (weight portion), conductive tin oxide is described in table 1, table 2.In addition, water soluble ion conductive agent as described below.
LiTFSI: two trifyl imide li (" LiTFSI " that Sen Tian pharmaceutical industries society manufactures)
PX-2B: tetraethyl phosphonium bromide (" ヒ シ コ mono-リ Application PX-2B " that Japan Chemical Industry society manufactures)
PX-2H: four ethyl phosphonium hydroxides (" ヒ シ コ mono-リ Application PX-2H " that Japan Chemical Industry society manufactures)
The making > of < charged roller
At the hollow part of cylindric shaping dies, in the mode coaxial with shaping dies, axis body (metal-cored: external diameter 6mm) is set, after the hollow part of shaping dies injects rubber composition (1) or rubber composition (2) makes it heat, hardens, carry out the demoulding, forming thickness in the periphery of axis body is thus the elastomer layer of 3mm.Then, after spraying top layer, the periphery resin combination of elastomer layer, make it dry, and form the top layer that thickness is 10 μm.By having made charged roller with upper type.
Specific insulation and relative dielectric constant are detected to prepared top layer resin combination.Detection method is shown in hereafter.
< specific insulation >
Top layer resin combination is coated on SUS304 plate, and in 130 DEG C of dryings 50 minutes, obtains the sheet sample that thickness is 30 μm thus.By silver coating slurry on a surface of the sheet sample at gained, and be provided with the electrode (band guard electrode) of 10mm × 10mm size.On the other hand, counter electrode is provided with in the face with the opposition side, face being provided with electrode.According to JIS K 6911, at 23 DEG C, the two interelectrode resistance detected under 53%RH environment under the condition applying voltage 100V.
< relative dielectric constant >
23 DEG C, under 53%RH environment, to the sheet sample of the mode gained same with the detection of specific insulation, detect the relative dielectric constant when to detect frequency be 1kHz.
Made charged roller be have detected to the carried charge on top layer.In addition, use made charged roller, under each applying voltage under low temperature and low humidity environment, to whether producing sand-like spot, whether produce ghost image and check.Then, long duration test has been carried out to made charged roller, and the pollutional condition after long duration test has been evaluated.In addition, under hot and humid environment, check whether producing paradoxical discharge.In addition, under hot and humid environment, check whether producing to ooze out.Detection method, evaluation method are shown in hereafter.
< carried charge >
As shown in Figure 2, rolling clamp 6 is assembled photosensitive drums 1 (photosensitive drums of the manufacture of コ ニ カ ミ ノ Le タ society, magicolor 4750DN), charged roller 2 is contacted with photosensitive drums 1, the two ends of charged roller 2 is loaded to the load of 1kg.Now, surround entirety with chest and carry out shading.DC voltage (-1200V) is only applied from the power supply 3 be connected with charged roller 2, utilize the surface potential meter 5 (ト レ Star Network ジ ヤ パ Application (strain) manufacture, " MODEL-370 ") possessing high-voltage probe 4, in the dark detect the surface potential (drum current potential) of the central portion of photosensitive drums 1.The revolution of photosensitive drums is set to 60rpm, turns the position of 90 ° at the circumferencial direction from the position of charged roller along photosensitive drums, at the potentiometric probe of position configuration surface of distance photosensitive drums 2mm.The surface potential of photosensitive drums under 10 DEG C × 10%RH environment, detects first lap and second enclose the surface potential rotated.
The sand-like spot > of <
Use commercially available color laser printer (manufacture of コ ニ カ ミ ノ Le タ society, magicolor 4750DN), at photo-conductor unit, charged roller is installed, by the band electrical bias ground connection supplied from main body, apply DC voltage from external power source (manufacture of ト レ ツク society, MODEL 615-3).Under each applying voltage, under 10 DEG C × 10%RH environment, make the half tone image of 12 × 2 dot pattern, visual examination is with or without sand-like spot.Situation to sand-like mottled Image Speckle unconfirmed is set to "○", the situation seeing trickle sand-like mottled Image Speckle is set to " zero-", the obvious situation of sand-like mottled Image Speckle is set to " △ ", by whole image black and the situation confirming photographic fog image is set to "×".
< ghost image >
Same with the evaluation of sand-like spot, charged roller is arranged on described commercially available color laser printer.Under each applying voltage, under 10 DEG C × 10%RH environment, make the half tone image of 12 × 2 dot pattern, visual examination is with or without ghost image.Situation to image retention (ghost image) unconfirmed for whole image is set to "○", the situation seeing trickle image retention in shadow tone is set to " zero-", obvious for image retention in shadow tone situation is set to " △ ", the situation that white part sees image retention is set to "×".
Pollution > after < long duration test
Elastomer layer is used to the situation of rubber composition (2) (chloropropylene oxide), use commercially available color laser printer (manufacture of コ ニ カ ミ ノ Le タ society, magicolor 4750DN), at photo-conductor unit, charged roller is installed, under the applying voltage of-1200V, 32.5 DEG C × 85%RH environment, carry out lettering test (lettering rate 5%) of 10000.Charged roller is taken out, visualization roller surface after this long duration test.The situation of the set to toner or toner additive unconfirmed for roller surface is set to "○", the situation seeing a little set is set to " △ ", situation about confirming the set of the degree that output image impacts is set to "×".
< paradoxical discharge >
Same with the evaluation of sand-like spot, charged roller is arranged on described commercially available color laser printer.Under each applying voltage, under 32.5 DEG C × 85%RH environment, make the half tone image of 12 × 2 dot pattern, visual examination is with or without the striped because of the image caused by paradoxical discharge.The situation of the striped to image unconfirmed is set to "○", the situation seeing a little striped in shadow tone is set to " zero-", obvious for striped in shadow tone situation is set to " △ ", the situation that white part sees striped is set to "×".
< oozes out >
After charged roller is placed 1 week under 40 DEG C × 95%RH environment, visual examination is oozed out with or without roller surface.The roller surface situation to oozing out unconfirmed being set to "○", being set to oozing out slight situation " △ ", the situation that whole roller surface is oozed out is set to "×".
Table 1, table 2 represent allotment ratio and the specific insulation of top layer resin combination, the testing result of relative dielectric constant of top layer resin combination.Table 3 represents evaluation during elastomer layer use rubber composition (1) (NBR).Table 4 represents evaluation during elastomer layer use rubber composition (2) (epichlorohydrin rubber).
Table 1 is see Fig. 3.
Table 2 is see Fig. 4.
Table 3 is see Fig. 5.The part scratched with diagonal line in table 3 represents to be evaluated.
Table 4 is see Fig. 6.
Known according to table 1, table 2, with do not allocate water soluble ion conductive agent and tin oxide the comparative example of any one top layer resin combination compared with, the specific insulation having allocated the top layer resin combination of this embodiment of two kinds is lower, and relative dielectric constant is higher.Further, known according to table 3, table 4, compared with comparative example 1a ~ comparative example 4a when using NBR with elastomer layer, any embodiment in embodiment 1A ~ embodiment 7A when elastomer layer uses NBR, the difference of first lap and the second carried charge enclosed is all less.Known equally, compared with comparative example 1b ~ comparative example 4b when using epichlorohydrin rubber with elastomer layer, any embodiment in embodiment 1B ~ embodiment 7B when elastomer layer uses epichlorohydrin rubber, the difference of first lap and the second carried charge enclosed is all less.Become abundant from the carried charge on the second circle top layer rotated in photosensitive drums, enclose the carried charge on top layer from first in known embodiment just enough high.
According to table 3, table 4, apply voltage if improved on the whole, then have the tendency that suppression image abnormity (sand-like spot, ghost image) produces.Therefore, to not producing, image abnormity (sand-like spot, ghost image) (can obtain "○" evaluation) is necessary executes alive value and compares.
Confirm, when elastomer layer uses NBR, as shown in table 3, compared with comparative example 1a ~ comparative example 4a, embodiment 1A ~ embodiment 7A all can reduce and not produce image abnormity (sand-like spot, ghost image) (can obtain "○" evaluation) necessary applying voltage.Namely can say, compared with comparative example 1a ~ comparative example 4a, even if embodiment 1A ~ embodiment 7A reduces the applying voltage to charged roller, under low temperature and low humidity environment, also easily suppress the generation of image abnormity (sand-like spot, ghost image).
And confirm, when elastomer layer uses epichlorohydrin rubber, compared with comparative example 1b ~ comparative example 4b, embodiment 1B ~ embodiment 7B also all can reduce and not produce image abnormity (sand-like spot, ghost image) (can obtain "○" evaluation) necessary applying voltage.Namely can say, compared with comparative example 1b ~ comparative example 4b, even if embodiment 1B ~ embodiment 7B reduces the applying voltage to charged roller, under low temperature and low humidity environment, also easily suppress the generation of image abnormity (sand-like spot, ghost image).
Further, when using the elastomeric material of more high-resistance NBR as elastomer layer, can reduce not producing that image abnormity (sand-like spot, ghost image) is necessary to be executed alive effect and can occur more significantly.
In product evaluation, generation and the surface of embodiment 1A ~ embodiment 7A, embodiment 1B ~ embodiment 7B pollution after long duration test all unconfirmed, paradoxical discharge are oozed out.That is, embodiment 1A ~ embodiment 7A, embodiment 1B ~ embodiment 7B all fully meets product performance.
In addition, in comparative example 1, owing to not allocating water soluble ion conductive agent, therefore relative dielectric constant is lower.In comparative example 2 ~ comparative example 4, owing to not allocating tin oxide, it is therefore high resistance.Therefore, in comparative example 2 ~ comparative example 4, under hot and humid environment, confirmed the striped because of the image caused by paradoxical discharge.
In reference example 1, because the allotment amount of water soluble ion conductive agent is very few, same with comparative example 1, relative dielectric constant is lower.Therefore, compared with comparative example 1, cannot reduce and not produce image abnormity (sand-like spot, ghost image) ("○" evaluation can be obtained) necessary applying voltage.In reference example 2, because the allotment amount of water soluble ion conductive agent is too much, therefore sees ionic conductive agent and ooze out.In reference example 3, because the allotment amount of tin oxide is very few, therefore there is the tendency of charged deficiency.Therefore, compared with comparative example 1, cannot reduce and not produce image abnormity (sand-like spot, ghost image) ("○" evaluation can be obtained) necessary applying voltage.In reference example 4, because the allotment amount of tin oxide is too much, the film forming of toner is seen on the roller surface therefore after long duration test.Therefore, the pollution aspect existing problems after long duration test.
Above, embodiments of the present invention have been described in detail, but the present invention is not by any restriction of described embodiment, can carry out various change without departing from the spirit of the invention within the scope.
description of reference numerals
10 charged roller
12 axis bodies
14 elastomer layers
16 top layers
Claims (5)
1. an electrified Roller Used For Electric Camera Device, it top layer possessing axis body, be formed at the conductive elastomer layer of described axis body periphery and be formed at described elastomer layer periphery,
It is characterized in that, described elastomer layer is by relative to ionic conductivity rubber 100 weight portion be made up of the one kind or two or more rubber being selected from epichlorohydrin rubber and nitrile rubber, the crosslinked of the rubber composition containing peroxide cross-linking agent 1.3 weight portion ~ 1.6 weight portion is formed
Described top layer is by relative to N-methoxymethylated nylon 100 weight portion, and the resin combination containing water soluble ion conductive agent 0.5 weight portion ~ 4.0 weight portion, conductive tin oxide 44 weight portion ~ 84 weight portion is formed,
The thickness on described top layer is 0.3 μm ~ 20 μm.
2. electrified Roller Used For Electric Camera Device according to claim 1; it is characterized in that, described water soluble ion conductive agent is the one kind or two or more ionic conductive agent being selected from two trifyl imide li, tetraethyl phosphonium bromide and four ethyl phosphonium hydroxides.
3. electrified Roller Used For Electric Camera Device according to claim 1 and 2, is characterized in that, the specific insulation forming the resin combination on described top layer is 1.0 × 10
10below Ω cm.
4. electrified Roller Used For Electric Camera Device according to claim 1 and 2, is characterized in that, the relative dielectric constant forming the resin combination on described top layer is more than 200.
5. electrified Roller Used For Electric Camera Device according to claim 1 and 2, is characterized in that, the rubber composition forming described elastomer layer contains conductive agent, and described conductive agent is ionic conductive agent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-035749 | 2011-02-22 | ||
| JP2011035749A JP5641522B2 (en) | 2011-02-22 | 2011-02-22 | Charging roll for electrophotographic equipment |
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| CN102645867A CN102645867A (en) | 2012-08-22 |
| CN102645867B true CN102645867B (en) | 2015-08-19 |
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| CN (1) | CN102645867B (en) |
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| JP6302799B2 (en) * | 2014-08-29 | 2018-03-28 | 株式会社ブリヂストン | Conductive member, conductive roller, and image forming apparatus |
| JP6919804B2 (en) * | 2017-05-22 | 2021-08-18 | 住友ゴム工業株式会社 | Conductive rubber composition, transfer rollers and image forming equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475870A (en) * | 2003-01-07 | 2004-02-18 | 广州市刘氏橡塑制品有限公司 | Charging roller and its manufacturing method |
| CN101334607A (en) * | 2007-06-25 | 2008-12-31 | 东海橡胶工业株式会社 | Charging roll |
| CN101727045A (en) * | 2008-10-24 | 2010-06-09 | 富士施乐株式会社 | Electrostatic charging member, electrostatic charging device, process cartridge and image forming apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4096241B2 (en) * | 2002-10-24 | 2008-06-04 | 住友ゴム工業株式会社 | Rubber roller using elastomer composition |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475870A (en) * | 2003-01-07 | 2004-02-18 | 广州市刘氏橡塑制品有限公司 | Charging roller and its manufacturing method |
| CN101334607A (en) * | 2007-06-25 | 2008-12-31 | 东海橡胶工业株式会社 | Charging roll |
| CN101727045A (en) * | 2008-10-24 | 2010-06-09 | 富士施乐株式会社 | Electrostatic charging member, electrostatic charging device, process cartridge and image forming apparatus |
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| Publication number | Publication date |
|---|---|
| JP2012173526A (en) | 2012-09-10 |
| CN102645867A (en) | 2012-08-22 |
| JP5641522B2 (en) | 2014-12-17 |
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