CN103105761B - Conductive rubber roller and imaging device - Google Patents
Conductive rubber roller and imaging device Download PDFInfo
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- CN103105761B CN103105761B CN201210571864.XA CN201210571864A CN103105761B CN 103105761 B CN103105761 B CN 103105761B CN 201210571864 A CN201210571864 A CN 201210571864A CN 103105761 B CN103105761 B CN 103105761B
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Abstract
The invention provides a kind of conductive rubber roller, comprise the top layer that metal shaft core, the elastic layer of metal shaft core outer cladding and elastic layer are formed outward, described elastic layer is formed by rubber A and at least one conductive filler of filling in this rubber A; Wherein the threshold range of conductive filler materials in rubber A is: Z
b≤ conductive filler
threshold≤ Y
b; If establish conductive filler B, C, X filling number in rubber A to be b, c, x, then b/Y respectively
b+ c/Y
c+ x/Y
x>=1.Conductive rubber roller provided by the invention, limited by the filler of the conductive filler to elastic layer, and the overall resistance of rubber roll is regulated by the resistance difference of inside and outside double-layer structure, conductive rubber roller can be made little to voltage-dependent, little by environmental change fluctuation, distribution of resistance is even, and rubber roll will make hardness rise because of a large amount of filled conductive filler of elastic layer, namely saved the cost of material, made again rubber roll entirety not lose flexibility.Present invention also offers a kind of imaging device, comprise described conductive rubber roller.
Description
[technical field]
The present invention relates to imaging device fields, be applicable to the conductive rubber roller of imaging device as electrophotographic copier, printer and electrostatic recording apparatus, especially relate to a kind of conductive rubber roller with toner transfer function, comprise the developer roll in electronic imaging device, clearer, charging roller and transfer roll.
[background technology]
In recent years, along with the development of imaging field technology, miniaturization, the print speed of imaging device increase substantially, the formation of high quality graphic has obtained instantly and popularized widely.People find through a large amount of research experiments, and toner is down to 5 μm from traditional 10 μm, and the particle size of toner is more even, sphericity is larger, more can meet above-mentioned performance.
In the past, in order to make ink powder with enough electric charges, as the conductive rubber roller of the important original paper of carrier, expect that it has the homogeneity that higher electric conductivity, electrical stability also require the change of soft, low pressure and hardness and distribution of resistance outward.But make so meticulous toner be filled with enough and uniform electric charge, require that its carrier rubber roll must have lower resistance and distribution of resistance homogeneity.
A kind of rubber roll comprising at least two vulcanised rubber layer is mentioned in Chinese patent literature CN101055455A, regulated the resistance value of rubber roll entirety by the resistance difference and thickness utilizing two sulfuration glue-lines, in environmental change, still there is stable resistance value to reach this rubber roll.But in order to reach higher electrical conductance, necessarily requiring the thickness of rubber topping very little, like this, being difficult to reach when depending merely on the shaping and later stage attrition process of rubber roll, the raising greatly of product fraction defective can being caused, finally cause the rising of cost of products.
In addition, we know, electronic conduction form has mainly been come with conductive path mechanism, tunnel effect, field emission effect, may be with a certain or several for principal mode existence at different conditions.When conductive filler is more than threshold value consumption, conductive path is main conduction mode, and now the consumption of conductive filler exists a critical value-threshold value, and in threshold range, the subtle change of conductive filler consumption all can cause the marked change of resistance; When conductive filler consumption is less or impressed voltage is less, solitary aggregation body space is comparatively large and cannot participate in conduction, and thermal vibration electronics between conducting particles, transition occurs and forms tunnel current, now based on tunnel effect; When conductive filler is less, between particle, internal electron is very strong, electronics will leap polymer interface barrier, transit on adjacent conducting particles, now main based on field emission effect.When based on the Conducting forms of tunnel effect or field emission effect, the electric conductivity of material changes by the change of external voltage.
Therefore, when basic unit's resistance is 10
5Ω-10
7during Ω, because this scope is in the threshold value of carbon black, its resistance value is easy to, by the dispersion of carbon black or the slight change of consumption, great-jump-forward occurs and changes.
[summary of the invention]
The object of the invention is to overcome above-mentioned prior art defect, the low easy processing of a kind of cost is provided and the conducting rubber roller of excellent conductive performance can be obtained.
For achieving the above object, the invention provides a kind of conductive rubber roller, comprise the top layer that metal shaft core, the elastic layer of described metal shaft core outer cladding and described elastic layer are formed outward, described top layer is conductive coating, and the resistance on described top layer is 10
7Ω-10
16within the scope of Ω; Described elastic layer is formed by rubber A and at least one electronic conduction filler of filling in this rubber A; Set this electronic conduction filler and be respectively B, C, X, then
The threshold range of conductive filler B materials in described rubber A is: Z
b≤ B
threshold≤ Y
b;
The threshold range of conductive filler C materials in described rubber A is: Z
c≤ C
threshold≤ Y
c;
The threshold range of conductive filler X materials in described rubber A is: Z
x≤ X
threshold≤ Y
x;
In above-mentioned expression formula, threshold value represents that this conductive filler is the value recorded after dispersion in the corresponding base material of 100 in mass parts, Y
b, Y
c, Y
xbe respectively the bottom threshold of conductive filler B, C, X materials in described rubber A, Z
b, Z
c, Z
xbe respectively the upper threshold of conductive filler B, C, X materials in described rubber A;
When described conductive filler B, C, X filling number in described rubber A is b, c, x respectively,
So b, c, x should meet following relational expression:
b/Y
b+c/Y
c+x/Y
x≥1；
And described elastic layer resistance R meets: 10
3Ω≤R≤10
5Ω.
Further, the gas-development agent through foaming sulfuration of 0.1-3% is filled with in the rubber A in described elastic layer.
Particularly, described gas-development agent material aperture is the scope of 0.1-90 μm.
Particularly, described elastic layer resistance R meets: 10
3Ω≤R≤10
5Ω, the resistance on described top layer is 10
7Ω-10
16within the scope of Ω;
Particularly, described elastic layer thickness is 1mm-12mm, and described skin depth is 1 μm-30 μm.
Particularly, the coated top layer of described elastic layer outside surface is in the dispersion liquid generated by isocyanates, polyvalent alcohol, chain extender, adds conductive filler, wetting agent and levelling agent and is formed.
The preparation method on described top layer is: in reactor, add isocyanates and polyvalent alcohol successively, stirring reaction is lowered the temperature after obtaining Isocyanate prepolymers body, add hydrophilic chain extender, low boiling point solvent carries out chain extension, obtain polyurethane dispersing liquid, add conductive filler or antistatic agent, wetting agent and levelling agent again, be uniformly mixed, obtain aqueous polyurethane liquid, be sprayed at the elastic layer of rubber roll on the surface by flush coater, be heating and curing and formed.
Present invention also offers a kind of imaging device, comprise conductive rubber roller described above.
Conductive rubber roller provided by the invention, the top layer that the elastic layer formed outward by metal shaft core and metal shaft core and elastic layer are formed outward is formed, wherein elastic layer is by filling electronic conduction filler to reach requirement resistance in rubber substrate, and the conductive filler number of filling is not less than the maximal value of threshold range, so the resistance of elastic layer can not produce large fluctuation because of the slight change of the dispersion of conductive filler and consumption.The present invention with the addition of the gas-development agent of 0.1-3 part further in this elastic layer, is foaming structure after sulfidization molding, and making it cell diameter is 0.1-80 μm, and therefore this elastic layer can not affect the suppleness of rubber roll because of excessive interpolation conductive filler.And top layer adopts resistance to be 10
7-10
16the conductive coating of Ω, like this by the resistance difference on adjustable elastic layer and top layer to meet the overall resistance requirement of rubber roll.Therefore, conductive rubber roller provided by the invention, limited by the filler of the conductive filler to elastic layer, and the overall resistance of rubber roll is regulated further by the resistance difference of inside and outside double-layer structure, this conductive rubber roller can be made to have voltage-dependent little, little by environmental change fluctuation, the uniform feature of distribution of resistance, simultaneously, elastic layer forms through filling-foam agent post-foaming, therefore rubber roll will make hardness rise because of a large amount of filled conductive filler of elastic layer, namely the cost of material has been saved, rubber roll entirety is made again not lose flexibility, rubber roll can be met completely there is good electrical stability also require its soft outward, the uniformity demands of low pressure change and hardness and distribution of resistance.
Adopt the imaging device of above-mentioned conductive rubber roller, printed drawings is as even density, and picture quality is good, and quality is high, has broad application prospects.
[accompanying drawing explanation]
Fig. 1 is conductive rubber roller structural representation of the present invention.
[embodiment]
For realizing the object of the invention, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein, only for explaining the present invention, being not intended to limit the present invention.
In current conductive rubber roller product, because the electric conductivity of electronic conduction rubber composition affects larger by material scatters such as the carbon black be filled in rubber, metal oxide, metal powders, particularly when the conductive agent number of filling is in its threshold range, the subtle change of conductive filler consumption, all will cause the great-jump-forward of rubber composition resistivity to change.Therefore, in recent years, people tend to use the mode of ionic conduction to meet the requirement of conductive rubber roller electrical property more, but its conductivity of the mode of ionic conduction fluctuates with the change of environment, and require to improve gradually to print speed and print quality people, ionic conduction mode can not meet and given the lower resistance requirement of conductive rubber roller.
See Fig. 1, the invention provides a kind of conductive rubber roller, comprise metal shaft core 1, the elastic layer 2 that metal shaft core is formed outward, and the outer top layer 3 formed of elastic layer 2, wherein: described elastic layer 2 is formed, if set this electronic conduction filler to be respectively B, C, X by rubber A and at least one electronic conduction filler of filling in this rubber A, so
The threshold range of conductive filler B materials in described rubber A is: Z
b≤ B
threshold≤ Y
b;
The materials threshold range of conductive filler C in described rubber A is: Z
c≤ C
threshold≤ Y
c;
The threshold range of conductive filler X materials in described rubber A is: Z
x≤ X
threshold≤ Y
x;
In above-mentioned expression formula, B
threshold, C
threshold, X
thresholdrepresent that this conductive filler B, C, X are the value recorded after dispersion in the corresponding base material of 100 in mass parts respectively, Y
b, Y
c, Y
xbe respectively the bottom threshold of conductive filler B, C, X materials in described rubber A, Z
b, Z
c, Z
xbe respectively the upper threshold of conductive filler B, C, X materials in rubber A;
When described conductive filler B, C, X filling number in rubber A is b, c, x respectively, b, c, x in so each conductive filler should meet following relation:
b/Y
b+c/Y
c+x/Y
x≥1。
In the invention described above technical scheme, in order to meet conductive rubber roller low resistance, the uniform requirement of distribution of resistance, clad outside rubber roll metal shaft core 1 is set to the double-decker on elastic layer 2 and top layer 3, the conductive filler number of wherein filling in elastic layer 2 is not less than the maximal value of threshold range, the main conductive form of such elastic layer 2 completes with conductive path mechanism, the Conducting forms reducing tunnel effect and field emission effect exists, and avoids rubber roll resistance and changes by change in voltage.The conductive filler of simultaneously filling avoids threshold range, and therefore, because of the slight change of conductive filler, the resistance of elastic layer 2 can not occur that great-jump-forward changes, thus achieve object of the present invention.
Particularly, the thickness of described elastic layer is within the scope of 1mm-12mm, if thickness is lower than above-mentioned scope, directly impairs the flexibility of rubber roll, if thickness is higher than above-mentioned scope, can cause the decline of rubber roll intensity, affect the compression deformation of rubber roll.
Described elastic layer 2 base material can adopt acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, acrylic rubber, urethane rubber, neoprene or epichlorohydrin rubber isopolarity rubber, also can adopt: the non-polar rubbers such as ethylene-propylene-diene copolymer, natural rubber, butadiene rubber, isoprene rubber or silicon rubber, also or adopt in above-mentioned rubber two or more.
The elastic layer 2 of rubber roll of the present invention, except above-mentioned rubber components, also can add other compositions, as:
Softening agent: can be the paraffin oils of petroleum, naphthenic oil or hydrocarbon oil, the coal tar of coal tar system or coumarone, the ointment of fat oil system, glycerine or castor oil, the pine tar of pine tar system, rosin or tall oil, and the phthalate esters of synthesizing ester, aliphatic dicarboxylic acid esters class or phosphoric acid ester etc., one or more above-mentioned mixing selected by described softening agent, and addition is 1-60 mass parts (rubber components relative to 100 mass parts).
Filling agent: can be silicon dioxide, potter's clay, anhydrous aluminium silicate, zeyssatite, feldspar powder, ground pumice, talcum powder, mica powder, calcium silicate, wollastonite in powder, asbestos, calcium carbonate, magnesium carbonate, dolomite dust, ammonium sulfate, basic aluminium sulphate, barium sulphate, ground barium sulfate, calcium sulphate, lithopone, magnesium oxide, zinc paste, aluminium oxide, iron oxide, titania, aluminium hydroxide, calcium hydroxide, fine breeze or graphite etc. and above-mentioned material product after activation modification, addition be 5-80 mass parts (rubber components relative to 100 mass parts).
Aging resister: can be aldehyde-amine resultant of reaction, reaction product of acetone and amine, secondary diarylamine, alkylaryl secondary amine, fragrant di-primary amine, substituted phenol, thiobis substituted phenol, alkylene two substituted phenol and polysubstituted phenol, polyhydric phenol or protection wax etc., addition be 0.1-5 mass parts (rubber components relative to 100 mass parts).
Vulcanizing agent: can be sulphur, selenium, tellurium, sulfocompound, superoxide, quinones, maleimide, resene, metal oxide, organic amine or isocyanates etc., addition be 0.5-15 mass parts (rubber constituents relative to 100 mass parts).
Vulcanization accelerator: can be dithiocarbamates, xanthogenic acid salt, thiurams, thiazoles, sulfenamide, aldehyde amines, guanidine class or Thiourea etc.Can add 0.1 to 10 parts (rubber components relative to 100 mass parts) by the difference of elastic layer 2 sulfuration process, rubber roll goods thickness.
Activating agent: can comprise metal oxide-type and the fatty acids such as stearic acid, oleic acid such as zinc paste, magnesium oxide, calcium oxide, addition is 0.3-20 mass parts (rubber components relative to 100 mass parts).
Above-mentioned elastic layer resistance R meets: 10
3Ω≤R≤10
5Ω.When resistance is less than 10
3during Ω, rubber roll overall electrical resistance can be made too low, be easy to make electric current pass rubber roll, cause carrying capacity excessive and the phenomenon that print density that is that cause is on the low side; When resistance is greater than 10
5during Ω, rubber roll overall electrical resistance can be made too high and not easily make electric current pass through, finally cause because ink powder charging is too low and cause gradation of drop-out colour too high.
Rubber roll of the present invention also can be filled with the gas-development agent (rubber components relative to 100 mass parts) of 0.1-3 part through over cure in elastic layer 2, make elastic layer 2 for foaming structure, therefore rubber roll will make hardness rise because of a large amount of filled conductive filler of elastic layer 2, both saved the cost of material, and made again rubber roll entirety not lose flexibility.Wherein gas-development agent aperture is between 0.1-90 μm, is preferably 10-40 μm.When aperture is less than above-mentioned scope, directly impair the flexibility of rubber roll, if aperture is higher than above-mentioned scope, one is the decline that can cause rubber roll intensity, affects the compression deformation of rubber roll, and two is that excessive aperture is difficult to form top layer at elastic layer 2 outside surface.
In concrete enforcement, the gas-development agent of filling in described elastic layer 2 can be inorganic foaming agent: as hartshorn salt, ammonium bicarbonate, sodium bicarbonate, sodium carbonate, ammonium chloride or sodium nitrite etc., also can be organic foaming agent: as azoaminobenzene, azobisformamide, azoisobutyronitrile, diethyl azodiformate, azo-carboxylic acid's barium, benzene sulfonyl hydrazide two benzene sulfonyl hydrazide ether, p-toluenesulfonic acid hydrazine, Toluene-2,4-diisocyanate, 4-disulfonyl hydrazide, phenyl-1, 3-disulfonyl hydrazide, dinitrosopentamethylene tetramine, N, N '-dimethyl-N, N '-dinitrosoterephthalamine, p-toluene sulfonylsemicarbazide, right, p-oxygen two (benzenesulfonamido-urea), biuret and urea, tolysulfonyl changes nitrogen, benzene sulfonyl changes nitrogen, toluene-p-sulfonyl acetone hydrazone, 3, 3-disulfonyl hydrazide diphenylsulphone, thiatriazole derivative, trihydrazinotriazine, Arcton 11 or zinc-ammino-complex etc.Can be one in the above gas-development agent or several and use, also can add the blowing promotors such as organic acid, urea and derivant thereof according to situation.
The kind of rubber roll of the present invention to the conductive filler that elastic layer 2 is filled does not limit, and can be conductive black, metal powder, metal oxide etc.In order to sizing material can have good intensity and elasticity, be preferably conductive black.
Described in rubber roll of the present invention, top layer 3 is conductive coating, be preferably aqueous polyurethane conductive coating, also can use the product that commercially available product is modified: as Bayhyol PR 240, Bayhyol XP 2470 and the aqueous anionic polyurethane dispersion such as Bayhyol XP 2655, in stirring, in above-mentioned aqueous anionic polyurethane dispersion, add the auxiliary agents such as conductive filler, antistatic agent, wetting agent and levelling agent, thus form aqueous polyurethane conductive coating.Or, 20 ~ 40% isocyanates and 50 ~ 70% polyvalent alcohols are added successively in reactor, stirring reaction is lowered the temperature after obtaining Isocyanate prepolymers body, add 5 ~ 15% hydrophilic chain extender, low boiling point solvent carries out chain extension, obtain aqueous polyurethane dispersing liquid, then add conductive filler 3.5-30wt% or antistatic agent 0.5-10wt%, wetting agent and levelling agent 1-10wt%, be uniformly mixed, obtain aqueous polyurethane liquid, be sprayed at the elastic layer 2 of rubber roll on the surface by flush coater, be heating and curing and formed.
In concrete enforcement, described top layer 3 can also adopt the mode of adding electronic conductance agent or ionic conductive agent to make its resistance reach expectation value.Be preferably ionic conductive agent, because top layer 3 is in the outermost layer of rubber roll, ionic conductive agent more easily forms uniform distribution of resistance.The addition of ionic conductive agent is generally 0.5-10wt%.
In rubber roll provided by the invention, the resistance value on described top layer 3 is 10
7-10
16Ω, is preferably 10
8-10
11Ω, is more preferably 10
9-10
10Ω.When resistance is less than 10
7during Ω, because elastic layer 2 is containing conductive filler, there is certain resistance value, rubber roll overall electrical resistance can be made so too low, be easy to make electric current pass rubber roll, cause carrying capacity excessive and phenomenon that print density that is that cause is on the low side; When resistance is greater than 10
16during Ω, top layer 3 too high in resistance and not easily make electric current pass through, finally causes because ink powder charging is too low and causes gradation of drop-out colour too high.
More specifically, above-mentioned top layer 3 thickness, preferably at 1-30 μm, if thickness is higher than above-mentioned scope, directly impairs the flexibility of rubber roll, and is that rubber roll overall electrical resistance is bigger than normal, if thickness is lower than above-mentioned scope, easily causes puncture when being applied to the voltage on rubber roll and being excessive.
Present invention also offers a kind of imaging device, have conductive rubber roller described above, described conductive rubber roller can be developer roll, clearer, charging roller or transfer roll.
Be further described below in conjunction with the preparation of embodiment to conductive rubber roller of the present invention.
[embodiment 1]
By ethylene-propylene-diene copolymer (EPDM) 100 parts, 1# carbon black 20 parts, 2# carbon black 8 parts, 3# carbon black 3 parts, gas-development agent OBSH1 part, paraffin oil 8 parts, precipitated calcium carbonate 40 parts, 1.5 parts, sulphur, vulcanization accelerator 2.5 parts, wherein the threshold range of 1# carbon black in EPDM is 35≤1# carbon black
threshold≤ 40; The threshold range of 2# carbon black in EPDM is 18≤2# carbon black
threshold≤ 20; The threshold range of 3# carbon black in EPDM is 9≤3# carbon black
threshold≤ 10.That is: b/Y
b+ c/Y
c+ x/Y
x=20/40+8/20+3/10=1.2>1.
Mixed with opening rubber mixing machine or internal rubber mixer according to a conventional method, obtained rubber composition I.
Then by rubber composition I by external diameter be 16mm, endoporus is that the standard extruder of 5mm is shaping, cross microwave vulcanization case subsequently, microwave power and transporting velocity is regulated to make sulfuration post-foaming aperture at 20-30 μm, metal shaft core (diameter=6mm) is placed in the middle of after shaping end, making it be formed middle is metal shaft core, metal shaft core is outward the preform of elastic layer, and it is 15mm that rubber roll is ground to diameter by this preform emery wheel, makes its resistance be 3.8 × 10
4Ω.
As aqueous polyurethane coating, use the Bayhyol XP 2655 aqueous anionic polyurethane dispersion of Beyer Co., Ltd.In stirring, in above-mentioned aqueous anionic polyurethane dispersion, add antistatic agent 8wt%, wetting agent and levelling agent 5wt%, be uniformly mixed, thus formation resistance value is 10
9the water polyurethane electric conduction paint of Ω.Then be sprayed onto ground roll surfaces by flush coater, THICKNESS CONTROL, at 5-10 μm, is heating and curing and within 1 hour, namely obtains the conductive rubber roller roller of the present embodiment under 120 DEG C of conditions, and this roller length is 22mm.
[embodiment 2]
By ethylene-propylene-diene copolymer (EPDM) 80 parts, acrylonitrile-butadiene rubber (NBR) 20 parts, 1# carbon black 19 parts, 2# carbon black 5 parts, 3# carbon black 3 parts, gas-development agent OBSH1 part, paraffin oil 8 parts, precipitated calcium carbonate 40 parts, 1.5 parts, sulphur, vulcanization accelerator 2.5 parts, wherein the threshold range of 1# carbon black in EPDM:NBR=80:20 is 34≤1# carbon black
threshold≤ 38; The threshold range of 2# carbon black in EPDM:NBR=80:20 is 16≤2# carbon black
threshold≤ 18; The threshold range of 3# carbon black in EPDM:NBR=80:20 is 7.5≤3# carbon black
threshold≤ 8.5.That is: b/Y
b+ c/Y
c+ x/Y
x=19/38+5/18+3/8.5=1.13>1.
Mixed with opening rubber mixing machine or internal rubber mixer according to a conventional method, obtained rubber composition I.
Then by rubber composition I by external diameter be 16mm, endoporus is that the standard extruder of 5mm is shaping, cross microwave vulcanization case subsequently, microwave power and transporting velocity is regulated to be that sulfuration post-foaming aperture is at 20-30 μm, metal shaft core (diameter=6mm) is placed in the middle of after shaping end, making it be formed middle is metal shaft core, metal shaft core is outward the preform of elastic layer, by this preform emery wheel will most rubber roll to be ground to diameter be 15mm, make its resistance be 2.4 × 10
4Ω.
As aqueous polyurethane coating, use the Bayhyol XP 2655 aqueous anionic polyurethane dispersion of Beyer Co., Ltd.In stirring, in above-mentioned aqueous anionic polyurethane dispersion, add antistatic agent 8wt%, wetting agent and levelling agent 5wt%, thus formation resistance value is 10
9the water polyurethane electric conduction paint of Ω.Then be sprayed onto ground roll surfaces by flush coater, THICKNESS CONTROL, at 5-10 μm, is heating and curing and within 1 hour, namely obtains the conductive rubber roller roller of the present embodiment under 120 DEG C of conditions, and this rubber roll roller length is 22mm.
[embodiment 3]
By ethylene-propylene-diene copolymer (EPDM) 100 parts, 1# carbon black 50 parts, gas-development agent OBSH1 part, paraffin oil 8 parts, precipitated calcium carbonate 40 parts, 1.5 parts, sulphur, vulcanization accelerator 2.5 parts, wherein the threshold range of 1# carbon black in EPDM is 35≤1# carbon black
threshold≤ 40.That is: b/Y
b+ c/Y
c+ x/Y
x=50/40=1.25>1.
Mixed with opening rubber mixing machine or internal rubber mixer according to a conventional method, obtained rubber composition I.
Then by rubber composition I by external diameter be 16mm, endoporus is that the standard extruder of 5mm is shaping, cross microwave vulcanization case subsequently, microwave power and transporting velocity is regulated to be that sulfuration post-foaming aperture is at 20-30 μm, metal shaft core (diameter=6mm) is placed in the middle of after shaping end, making it be formed middle is metal shaft core, metal shaft core is outward the preform of elastic layer, by this preform emery wheel will most rubber roll to be ground to diameter be 15mm, make its resistance be 2.3 × 10
3Ω.
As aqueous polyurethane coating, use the Bayhyol XP 2655 aqueous anionic polyurethane dispersion of Beyer Co., Ltd.In stirring, in above-mentioned aqueous anionic polyurethane dispersion, add antistatic agent 8wt%, wetting agent and levelling agent 5wt%, thus formation resistance value is 10
9the water polyurethane electric conduction paint of Ω.Then be sprayed onto ground roll surfaces by flush coater, THICKNESS CONTROL, at 5-10 μm, is heating and curing and within 1 hour, namely obtains the conductive rubber roller roller of the present embodiment under 120 DEG C of conditions, and this roller length is 22mm.
[comparative example 1]
Except the carbon black number in rubber composition I becomes: 1# carbon black 18 parts, 2# carbon black 5 parts, 3# carbon black 2 parts, its resistance is made to be 1.5 × 10
6Ω, other is all identical with embodiment 1, that is: b/Y
b+ c/Y
c+ x/Y
x=18/40+5/20+2/10=0.9 < 1.Obtain the conductive rubber roller of comparative example 1.
[comparative example 2]
Except the foaming aperture in rubber composition I becomes 140-150 μm, other is all identical with embodiment 1, obtains the conductive rubber roller roller of comparative example 2.
[comparative example 3]
Except the 1# carbon black in rubber composition I becomes 38 parts, its resistance is made to be 1.2 × 10
6Ω, other is all identical with embodiment 3, that is: b/Y
b+ c/Y
c+ q/Y
x=38/40=0.95 < 1.Obtain the conductive rubber roller roller of comparative example 3.
[comparative example 4]
Except the carbon black number in rubber composition I becomes: 1# carbon black 18 parts, 2# carbon black 4 parts, 3# carbon black 2 parts, its resistance is made to be 3.1 × 10
6Ω, other is all identical with embodiment 2, i.e. b/Y
b+ c/Y
c+ x/Y
x=18/38+4/18+2/8.5=0.93 < 1.Obtain the conductive rubber roller roller of comparative example 4.
[comparative example 5]
Except the quantitative change adding antistatic agent in the aqueous anionic polyurethane dispersion forming top layer is 12wt%, its resistance is made to become 10
5outside Ω, other is all identical with embodiment 3, obtains the conductive rubber roller roller of comparative example 5.
[comparative example 6]
Except the quantitative change adding antistatic agent in the aqueous anionic polyurethane dispersion forming top layer is 5wt%, its resistance is made to become 10
18outside Ω, other is all identical with embodiment 3, obtains the conductive rubber roller roller of comparative example 6.
The preparation of table 1 conductive rubber roller
[measurement of resistive voltage correlativity]
Each conductive rubber roller roller circumferential surface is placed in long 400mm, diameter 30mm Aluminum cylindrical circumferential surface on.Then, the load of 0.5kg is respectively added in the axle core both sides of conductive rubber roller roller.Be 55% in humidity, under the environment of temperature 25 DEG C, conductive rubber roller roller rotated with the speed of 60 turns per minute.This conductive rubber roller roller is applied respectively to the voltage of 500V, 125V, measure the resistance value R of conductive rubber roller roller
500Ω and R
125Ω, takes the logarithm to it, the results are shown in Table 2.
[stability measurement of resistance environment]
Each conductive rubber roller is placed in condition one respectively: temperature 50 C, humidity 80%, condition two: in two climatic chambers of temperature 10 DEG C, humidity 30%, rubber roll resistance is tested, except applying voltage is that except 500V, other method of testings are measured with resistive voltage correlativity after 24 hours.Record the resistance value R of an according to condition conductive rubber roller roller placed
highΩ and R
lowΩ, takes the logarithm to it, the results are shown in Table 2.
Table 2 resistance measurement
As can be seen from Table 2, when the conductive filler of elastic layer filling is in threshold range or when being less than threshold value, rubber roll voltage dependence is larger; The effect that conductive coating can be made to play insulation course when conductive coating too high in resistance makes rubber roll overall electrical resistance bigger than normal; When conductive coating resistance is on the low side, the effect to elastic layer resistance adjustment cannot be completed, cause the overall resistance of rubber roll too low.And adopting rubber roll provided by the invention, its resistive voltage correlativity is little, and resistance environmental stability is high.
The above embodiment only have expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. a conductive rubber roller, comprise the top layer that metal shaft core, the elastic layer of described metal shaft core outer cladding and described elastic layer are formed outward, it is characterized in that, described top layer is conductive coating, and the resistance on described top layer is 10
7Ω-10
16within the scope of Ω; Described elastic layer is formed by rubber A and at least one electronic conduction filler of filling in this rubber A; Set this electronic conduction filler and be respectively B, C, X, then
The threshold range of conductive filler B materials in described rubber A is: Z
b≤ B
threshold≤ Y
b;
The threshold range of conductive filler C materials in described rubber A is: Z
c≤ C
threshold≤ Y
c;
The threshold range of conductive filler X materials in described rubber A is: Z
x≤ X
threshold≤ Y
x;
In above-mentioned expression formula, threshold value represents that this conductive filler is the value recorded after dispersion in the corresponding base material of 100 in mass parts, Y
b, Y
c, Y
xbe respectively the bottom threshold of conductive filler B, C, X materials in described rubber A, Z
b, Z
c, Z
xbe respectively the upper threshold of conductive filler B, C, X materials in described rubber A;
When described conductive filler B, C, X filling number in described rubber A is b, c, x respectively,
So b, c, x should meet following relational expression:
b/Y
b+c/Y
c+x/Y
x≥1；
And described elastic layer resistance R meets: 10
3Ω≤R≤10
5Ω.
2. conductive rubber roller as claimed in claim 1, is characterized in that, is filled with the gas-development agent through foaming sulfuration of 0.1-3% in the rubber A in described elastic layer.
3. conductive rubber roller as claimed in claim 2, is characterized in that, described gas-development agent material aperture is the scope of 0.1-90 μm.
4. the conductive rubber roller as described in any one of claim 1-3, is characterized in that, described elastic layer thickness is 1mm-12mm, and described skin depth is 1 μm-30 μm.
5. the conductive rubber roller as described in any one of claim 1-3, is characterized in that, the coated top layer of described elastic layer outside surface is in the dispersion liquid generated by isocyanates, polyvalent alcohol and chain extender, adds conductive filler, wetting agent and levelling agent and is formed.
6. conductive rubber roller as claimed in claim 5, it is characterized in that, the preparation method on described top layer is: in reactor, add isocyanates and polyvalent alcohol successively, and stirring reaction is lowered the temperature after obtaining Isocyanate prepolymers body, adds hydrophilic chain extender, low boiling point solvent carries out chain extension, obtain polyurethane dispersing liquid, add conductive filler or antistatic agent, wetting agent and levelling agent again, be uniformly mixed, obtain aqueous polyurethane liquid, be sprayed at the elastic layer of rubber roll on the surface by flush coater, be heating and curing and formed.
7. an imaging device, is characterized in that: comprise the conductive rubber roller described in any one of claim 1-6.
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| CN201210571864.XA CN103105761B (en) | 2012-12-25 | 2012-12-25 | Conductive rubber roller and imaging device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210571864.XA CN103105761B (en) | 2012-12-25 | 2012-12-25 | Conductive rubber roller and imaging device |
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| CN103105761A CN103105761A (en) | 2013-05-15 |
| CN103105761B true CN103105761B (en) | 2015-10-28 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103923400A (en) * | 2014-03-11 | 2014-07-16 | 北京绿色快车国际橡塑制品有限公司 | Conductive foaming tube and preparation method |
| CN103911059B (en) * | 2014-04-28 | 2016-04-27 | 上海茂霖高分子科技股份有限公司 | A kind of for resistance wear-resistant coating and preparation method thereof in semiconductive rubber roller |
| CN103911060B (en) * | 2014-04-28 | 2016-04-27 | 上海茂霖高分子科技股份有限公司 | A kind of low resistance wear-resistant coating for semiconductive rubber roller and preparation method thereof |
| JP6531891B2 (en) * | 2014-10-09 | 2019-06-19 | シンジーテック株式会社 | Method of manufacturing fixing / pressure roll and method of manufacturing fixing device |
| CN105469881A (en) * | 2016-01-10 | 2016-04-06 | 叶玉浩 | Flame-retardant cable |
| CN111158227A (en) * | 2020-02-17 | 2020-05-15 | 平田橡塑五金制品（深圳）有限公司 | Transfer roller with stable resistance value and preparation method thereof |
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| CN1655288A (en) * | 2004-02-12 | 2005-08-17 | 住友橡胶工业株式会社 | Semi-conductive rubber part |
| CN2847337Y (en) * | 2005-10-21 | 2006-12-13 | 沈阳奥迪橡塑有限公司 | Developing roller for laser printer |
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| WO2008090996A1 (en) * | 2007-01-22 | 2008-07-31 | Canon Kabushiki Kaisha | Method for producing regenerated elastic roller, regenerated elastic roller, electronic photography process cartridge, and electronic photography image forming apparatus |
| CN101533243A (en) * | 2008-03-14 | 2009-09-16 | 住友橡胶工业株式会社 | Conductive roller |
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| US7544158B2 (en) * | 2005-05-09 | 2009-06-09 | Canon Kasei Kabushiki Kaisha | Electroconductive rubber roller |
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| CN1534400A (en) * | 2003-03-31 | 2004-10-06 | 东海橡胶工业株式会社 | Development roller |
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