CN102566371B - Conductive rubber roller and imaging device - Google Patents

Conductive rubber roller and imaging device Download PDF

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CN102566371B
CN102566371B CN201110458414.5A CN201110458414A CN102566371B CN 102566371 B CN102566371 B CN 102566371B CN 201110458414 A CN201110458414 A CN 201110458414A CN 102566371 B CN102566371 B CN 102566371B
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rubber
basic unit
hardness
soft basic
rubber roller
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CN102566371A (en
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佟振双
羊辉
李绍昌
张海清
韩昌哲
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SHENZHEN LEPUTAI TECHNOLOGY CO LTD
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SHENZHEN LEPUTAI TECHNOLOGY Co Ltd
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Abstract

The invention provides a conductive rubber roller which comprises a metal shaft core and a rubber layer wrapped on the metal shaft core, wherein the rubber layer comprises a low-hardness base layer formed by polar rubber materials and a high-hardness covering layer formed by nonpolar rubber materials formed on the outside surface of the low-hardness base layer; a softener is filled in the low-hardness base layer; and the solubility parameter Delta A of the softener filled in the low-hardness base layer, the solubility parameter Delta B of rubber components of the high-hardness covering layer, and the solubility parameter Delta C of rubber components of the low-hardness base layer have the following relational expression: (Delta A- Delta B) is greater than or equal to 2.8 (J/cm<3>)<1/2>; and | Delta A- Delta C | is less than or equal to 1.5 (J/cm<3>)<1/2>. According to the invention, the migration of the softener from the low-hardness base layer to the high-hardness covering layer is effectively prevented, and the pollution to photosensitive members is avoided in the process of using the conductive rubber roller, and therefore, both the hardness requirement of the whole rubber layer is ensured, and the conductive rubber roller has softness, the resistance fluctuation caused by environment and time changes is small, and the resistance is distributed uniformly. The invention also provides an imaging device with the conductive rubber roller.

Description

Conducting rubber roller and imaging device
[technical field]
The present invention relates to imaging device field, be applicable to imaging device as the conducting rubber roller of electrophotographic copier, printer and electrostatic recording apparatus, especially relate to the rubber layer of above-mentioned conducting rubber roller.
[background technology]
Along with the development of Electronic Photographing Technology, the pursuit of people to printing effect, as the conduction rubber roll of important original paper wherein, expects that it has the homogeneity that higher electric conductivity, electrical stability also require soft, low pressure change and hardness and distribution of resistance outward.
Conduction roller, developer roll, transfer roll all directly contact with electrostatic latent image holder, therefore need to have softness to a certain degree, make to keep certain contacting with electrostatic latent image device.
In order to reach elastomeric material, possess certain soft degree, generally need in material, fill the small molecule materials such as softening agent.But it is found that, in resilient material, add after softening agent, thereby can pollute and affect printing effect it when contacting with electrostatic latent image holder.
In order to make rubber roll possess lower hardness, conventionally can adopt expanded material to meet this requirement.
As disclosed in CN-1379293A, by apply the nonpolar rubberite layer of an electronic conduction on a kind of foamed rubber layer surface, reach soft and resistance-stable rubber roll, but the conduction roller of this manufacture particularly spongy layer is subject to technogenic influence very large, sponge pore size and uniformity coefficient are directly affected by the dispersion of crosslinking chemical, gas generation agent and curing temperature, and then cause the hardness of rubber roll and resistance at circumferencial direction and variant in a lateral direction, affect printing effect.
[summary of the invention]
The object of the invention is to overcome above-mentioned prior art defect, provide a kind of cost low and can obtain the conducting rubber roller of good image.
For achieving the above object, the invention provides a kind of conducting rubber roller, comprise metal shaft core and be coated on the rubber layer on described metal shaft core, described rubber layer comprises that Shore A hardness is that the soft basic unit of 10 °-40 ° and the Shore A hardness that forms outside described soft basic unit are the high rigidity overlayer of 40 °-60 °, the non-polar rubber material that described high rigidity overlayer is 0.3mm-3mm by thickness forms, the polar rubber material that described soft basic unit is 2mm-8mm by thickness forms, be filled with softening agent, wherein be filled in the softening agent solubility parameter δ of described soft basic unit asolubility parameter δ with described high rigidity overlayer rubber constituent bthere is following relational expression: δ a-δ b>=2.8(J/cm 3) 1/2, the softening agent solubility parameter δ of described soft basic unit asolubility parameter δ with described soft basic unit rubber constituent cthere is following relational expression: ︱ δ a-δ c︱≤1.5(J/cm 3) 1/2.
The present invention also provides a kind of imaging device with above-mentioned conducting rubber roller.
The present invention arranges rubber layer layering in the project organization of conducting rubber roller, and in the preparation process of rubber layer to adding difference between the softening agent solubility parameter of soft basic unit and the solubility parameter of the solubility parameter of soft basic unit rubber constituent and high rigidity overlayer rubber constituent to limit, effectively prevent the mutual and infiltration of softening agent between soft basic unit and high rigidity overlayer, while avoiding using, polluted Electrifier frame, photoreceptor.Meanwhile, rubber layer layering setting had both reached the hardness requirement of whole rubber layer, had again flexibility, its resistance is subject to the variation fluctuation of environment and time little, distribution of resistance is even, has guaranteed the stable of conducting rubber roller electrical property, can make imaging device obtain good image quality.
[accompanying drawing explanation]
Fig. 1 is conductive rubber roll structure cut-open view 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, be not intended to limit the present invention.
Referring to Fig. 1, the invention provides a kind of conducting rubber roller, comprise metal shaft core 1 and be coated on the rubber layer 2 of this metal shaft core outer surface, 2 of described rubber layers comprise soft basic unit 21 and at the high rigidity overlayer 22 of described soft basic unit 21 outer formation, in order to reach the hardness requirement of soft basic unit 21, in described soft basic unit 21, be filled with a large amount of softening agents, be wherein filled in the softening agent solubility parameter δ of described soft basic unit 21 asolubility parameter δ with described high rigidity overlayer 22 rubber constituents bdifference there is following relational expression: δ a-δ b>=2.8(J/cm 3) 1/2.This is because work as δ a-δ b<2.8(J/cm 3) 1/2time, the softening agent that is filled in soft basic unit 21 just can be in a large number to 22 migrations of high rigidity overlayer, finally pollute photosensitive drums and affect printing effect.And work as δ a-δ b>=2.8(J/cm 3) 1/2time; be filled in softening agent and the high rigidity overlayer 22 matrix compatibility variation of soft basic unit 21; high rigidity overlayer 22 just can play the effect of a kind of shielding and protection like this, thereby has cut off softening agent in soft basic unit 21 to the path of external migration, and then protection photosensitive drums is not contaminated.Meanwhile, the softening agent solubility parameter δ of described soft basic unit 21 asolubility parameter δ with rubber constituent in described soft basic unit 21 cthere is following relational expression: ︱ δ a-δ c︱≤1.5(J/cm 3), preferred ︱ δ a-δ c︱≤1(J/cm 3) 1/2, the best is δ a=δ c(J/cm 3) 1/2.From the close compatible mechanism of solubleness, when the solubility parameter of the softening agent in being filled in soft basic unit 21 is more than or equal to the solubility parameter of rubber constituent of soft basic unit 21, more can prevent that it from outwards separating out migration.Therefore, conducting rubber roller of the present invention requires rubber layer 2 layerings to be set to the softening agent solubility parameter δ of soft basic unit 21 and high rigidity overlayer 22，Bing Dui soft basic unit 21 according to its design and functions asolubility parameter δ with soft basic unit 21 rubber constituents cand the solubility parameter δ of high rigidity overlayer 22 rubber constituents bbetween difference limit, both effectively guaranteed the requirement of strength of whole rubber layer 2, can keep again its required flexibility simultaneously, also can prevent the mutual and infiltration of softening agent between soft basic unit 21 and high rigidity overlayer 22, avoid polluting Electrifier frame, photoreceptor, so realized object of the present invention.
In the present invention, be filled in the softening agent solubility parameter δ of described soft basic unit aat 14-25(J/cm 3) 1/2scope in, can be paraffin oils, naphthenic oil or the hydrocarbon oil of petroleum, coal tar or the coumarone of coal tar system, ointment, glycerine or the castor oil of fat oil system, pine tar, rosin or the tall oil of pine tar system, and the phthalate esters of synthesizing ester, aliphatic dicarboxylic acid esters class or phosphoric acid ester, described softening agent is selected one or more above-mentioned mixing.
Rubber components in soft of the present invention basic unit 21 is polar rubber, can be wherein one or more such as acrylonitrile butadiene rubber, epichlorohydrin rubber, neoprene, hydrogenated acrylonitrile butadiene rubber and urethane rubber and uses.In order to make this layer there is electric conductivity, can mix conductive black, metal powder, ionic conductive agent etc., by its hardness, resistance requirement, can add 1 to 50 mass parts (with respect to the rubber constituent of 100 mass parts).
Certainly, soft basic unit 21 can adopt spongy layer to replace, but in process, is subject to technogenic influence serious, particularly at spongy layer, forms outward in the process of hard layer.While adopting poling method, foamed rubber layer is easily out of shape; Adopt double-deckly while extruding the method for formation, spongy layer is easy to be under pressure in the process of sulfur foam, temperature uneven and cause that foaming aperture is not of uniform size; And while adopting cladding process, because spongy layer is aperture structure, hard glue-line can, to the internal penetration of spongy layer, be subject to the impact of spongy layer structure in surperficial being coated in it, the size of this infiltration is inevitable inhomogeneous, therefore will certainly affect the distribution of hardness and resistance.
Particularly, the Shore A hardness of described soft basic unit 21 is between 10 °-40 °, preferably between 20 °-30 °.Much higher hard can cause the flexibility of rubber roll inadequate, the too low intensity that can reduce rubber roll of hardness.
Particularly, the thickness of described soft basic unit 21 is preferably in 2mm-8mm, if thickness, lower than above-mentioned scope, directly impairs the flexibility of rubber roll, if thickness, higher than above-mentioned scope, can cause the decline of rubber roll intensity, affects the compression deformation of rubber roll.
High rigidity overlayer 22 of the present invention selects non-polar rubber to form, comprise butadiene rubber, Styrene-Butadiene, natural rubber, ethylene-propylene-diene copolymer etc., optimal ethylene-propylene diene copolymerized thing, because it has excellent ageing-resistant performance, can give rubber roll better permanance.
In order to shield little molecule in soft glue-line 21 to external migration, high rigidity glue-line 22 thickness requirements are controlled between 0.3mm-3mm, preferably 0.5mm-2mm.If thickness, lower than this scope, not only affects the intensity of rubber roll, can't shield the micromolecular migration of soft basic unit completely, and thickness is while being greater than this scope, will directly affect the pliability of rubber roll.
Because high rigidity overlayer 22 is exposed to outermost layer, for avoiding its electric conductivity to be subject to the impact of environmental turbulence, high rigidity overlayer 22 is preferably electron conduction.So in order to meet the electric conductivity of high rigidity overlayer 22, preferably fill electronic conductor, can add 1 to 70 mass parts (with respect to the rubber constituent of 100 mass parts) by its hardness, resistance requirement.
High durometer rubber overlayer 22 Shore A hardness are between 40 °-60 °, preferably between 45 °-55 °.
In rubber layer of the present invention, the tectal material of soft basic unit and high rigidity all adopts non-foam material.Except above-mentioned rubber and emollient component, also can add other compositions, as:
Vulcanizing agent: can be sulphur, selenium, tellurium, sulfocompound, superoxide, quinones, maleimide, resene, metal oxide, organic amine, isocyanates etc.
Vulcanization accelerator: can be dithiocarbamates, xanthogenic acid salt, thiurams, thiazoles, sulfenamide, aldehyde amines, guanidine class, Thiourea etc.By the difference of its sulfuration process, goods thin and thick, can add 0.1 to 6 part (with respect to rubber constituent of 100 mass parts).
Activating agent: can comprise the fatty acids such as the metal oxide-type such as zinc paste, magnesium oxide calcium oxide and stearic acid, oleic acid.
Can add suitable aging resister, filling agent etc. according to the service condition of product in addition.
The present invention also provides a kind of imaging device, has conducting rubber roller described above, and described conducting rubber roller can be developer roll, transfer roll.
Below in conjunction with embodiment, the preparation of conducting rubber roller of the present invention is further described.
[embodiment 1]
By nitrile rubber [δ c=19.2(J/cm 3) 1/2] 70 parts, epichlorohydrin rubber [δ c=19.8(J/cm 3) 1/2] 30 parts, 20 parts of carbon blacks, dibutyl phthalate [δ a=19.72(J/cm 3) 1/2] 45 parts, 40 parts of precipitated calcium carbonates, 2 parts, sulphur, 1 part of vulcanization accelerator, with opening rubber mixing machine or internal rubber mixer, mixed according to a conventional method, obtain rubber composition I.
By ethylene-propylene-diene rubber ([δ b=16.2(J/cm 3) 1/2] 100 parts, 25 parts of carbon blacks, 1.5 parts, sulphur, 1.5 parts of vulcanization accelerators, by above-mentioned same method, mix, obtain rubber composition II.
Then by rubber composition I and rubber composition II, by internal layer, be rubber composition I, diameter is 16mm, skin is rubber composition II, two-tube extruder moulding for the standard of diameter 19mm, in the middle of in forming process, be placed in metal shaft core (diameter=8mm), making it form middle is metal shaft core, metal shaft Xin Waiwei soft basic unit, the tectal preform of soft basic unit outer wrapping high rigidity, this preform is put into vulcanizing tank, with temperature 150 degree, pressure 0.4MPa heats 1h, make it produce cross-linking reaction, then with emery wheel, outermost layer being ground to diameter is 18mm, obtain the conducting rubber roller roller of the present embodiment, this roller length is 23.5mm.
[embodiment 2]
By nitrile rubber [δ c=19.2(J/cm 3) 1/2] 70 parts, epichlorohydrin rubber [δ c=19.8(J/cm 3) 1/2] 30 parts, 20 parts of carbon blacks, dioctyl phthalate [δ a=19.58(J/cm 3) 1/2] 45 parts, 40 parts of precipitated calcium carbonates, 2 parts, sulphur, 1 part of vulcanization accelerator, with opening rubber mixing machine or internal rubber mixer, mixed according to a conventional method, obtain rubber composition I.
By ethylene-propylene-diene rubber ([δ b=16.2(J/cm 3) 1/2] 100 parts, 25 parts of carbon blacks, 1.5 parts, sulphur, 1.5 parts of vulcanization accelerators, by above-mentioned same method, mix, obtain rubber composition II.
Then by rubber composition I and rubber composition II, by internal layer, be rubber composition I, diameter is 16mm, skin is rubber composition II, two-tube extruder moulding for the standard of diameter 19mm, in the middle of in forming process, be placed in metal shaft core (diameter=8mm), making it form middle is metal shaft core, metal shaft Xin Waiwei soft basic unit, the tectal preform of soft basic unit outer wrapping high rigidity, this preform is put into vulcanizing tank, with temperature 150 degree, pressure 0.4MPa heats 1h, make it produce cross-linking reaction, then with emery wheel, outermost layer being ground to diameter is 18mm, obtain the conducting rubber roller roller of the present embodiment, this roller length is 23.5mm.
[embodiment 3]
By nitrile rubber [δ c=19.2(J/cm 3) 1/2] 70 parts, epichlorohydrin rubber [δ c=19.8(J/cm 3) 1/2] 30 parts, 20 parts of carbon blacks, glycerine three (acetyl ricinoleic acid) ester [δ a=19.34(J/cm 3) 1/2] 45 parts, 40 parts of precipitated calcium carbonates, 2 parts, sulphur, 1 part of vulcanization accelerator, with opening rubber mixing machine or internal rubber mixer, mixed according to a conventional method, obtain rubber composition I.
By ethylene-propylene-diene rubber ([δ b=16.2(J/cm 3) 1/2] 100 parts, 25 parts of carbon blacks, 1.5 parts, sulphur, 1.5 parts of vulcanization accelerators, by above-mentioned same method, mix, obtain rubber composition II.
Then by rubber composition I and rubber composition II, by internal layer, be rubber composition I, diameter is 16mm, skin is rubber composition II, two-tube extruder moulding for the standard of diameter 19mm, in the middle of in forming process, be placed in metal shaft core (diameter=8mm), making it form middle is metal shaft core, metal shaft Xin Waiwei soft basic unit, the tectal preform of soft basic unit outer wrapping high rigidity, this preform is put into vulcanizing tank, with temperature 150 degree, pressure 0.4MPa heats 1h, make it produce cross-linking reaction, then with emery wheel, outermost layer being ground to diameter is 18mm, obtain the conducting rubber roller roller of the present embodiment, this roller length is 23.5mm.
[comparative example 1]
Except the dibutyl phthalate in rubber composition I changes naphthenic oil [δ into c=16.5(J/cm 3) 1/2] outside, other is all identical with embodiment 1, obtains the conducting rubber roller roller of comparative example 1.
[comparative example 2]
The softening agent dibutyl phthalate of the soft basic unit in comparative example 1 is removed, and added gas-development agent 4,5 parts of 4-OBSH, other is all identical with embodiment 1, obtains the conducting rubber roller roller of comparative example 2.
[comparative example 3]
Formula is with comparative example 2, different is first rubber composition I to be extruded into cylindric with extruder, then put it in vulcanizing tank, with 150 ℃ of heating 1h of temperature, when making its foaming, produce and be cross-linked, obtain spongy layer, metal shaft core is inserted to week in spongy layer, available adhesive is fixed, and then spongy layer is ground to external diameter 16mm.
Then rubber composition II is dissolved in toluene, obtains rubber pastel, then this pastel is coated in to the surface of sponge glue-line, after toluene volatilization, with 150 ℃ of temperature, being cross-linked 30 minutes, forming high durometer rubber layer, is then 18mm with emery wheel by outermost layer lapping diameter.(in Table 1)
The preparation of [table 1] electric conductivity rubber roll
Figure GDA0000377183960000061
[resistance measurement]
Conducting rubber roller roller circumferential surface is placed on the circumferential surface of aluminum cylinder of long 400mm, diameter 30mm.Then, the load that respectively adds 0.5kg in the axle core both sides of conducting rubber roller roller.In humidity, be 55%, under the environment of 25 ℃ of temperature, the speed rotation that conducting rubber roller roller is turned with per minute 60.The voltage that this conducting rubber roller roller is added to 500V, measures resistance value Rmax Ω and the Rmin Ω of conducting rubber roller roller, and it is taken the logarithm, and the results are shown in Table 2.
[hardness measurement]
Measure the Shore A hardness of this cylinder surface difference, obtain hardness max and hardness min, the results are shown in Table 2.
[table 2] test data
Figure GDA0000377183960000072
As can be seen from Table 2, adopt gained rubber roll of the present invention, in foaming layer, form overlayer gained rubber roll outward, its hardness, distribution of resistance be homogeneous more.
[polluting experiment]
The diameter of the axle core of embodiment 1, embodiment 2, embodiment 3 and comparative example 1 and soft glue-line is constant, and the thickness that only changes high rigidity glue-line pollutes experiment contrast, and concrete thickness is in Table 3.
Above-mentioned roller is close to and is contacted with OPC respectively, is under 45 ℃, the condition of humidity 80% after standing 7 days in temperature, takes out OPC and prints test, the results are shown in Table 3.
[table 3] pollutes experimental result
Figure GDA0000377183960000081
As can be seen from Table 3, when being filled in the softening agent solubility parameter δ of soft basic unit asolubility parameter δ with high rigidity overlayer rubber constituent bat δ a-δ b>=2.8(J/cm 3) 1/2softening agent solubility parameter δ with soft basic unit asolubility parameter δ with soft basic unit rubber constituent cat ︱ δ a-δ c︱≤1.5(J/cm 3) 1/2, and its cover thickness is while being greater than 0.3mm, contacts all pollution-free with OPC; And work as δ a-δ b< 2.8(J/cm 3) 1/2, ︱ δ a-δ c︱ > 1.5(J/cm 3) 1/2, when its cover thickness reaches 1.5mm, still can pollute OPC.
The above embodiment has only expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore 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 conducting rubber roller, comprise metal shaft core and be coated on the rubber layer on described metal shaft core, it is characterized in that: described rubber layer comprises that Shore A hardness is that the soft basic unit of 10 °-40 ° and the Shore A hardness that forms outside described soft basic unit are the high rigidity overlayer of 40 °-60 °, the non-polar rubber material that described high rigidity overlayer is 0.3mm-3mm by thickness forms, the polar rubber material that described soft basic unit is 2mm-8mm by thickness forms, be filled with softening agent, be wherein filled in the softening agent solubility parameter δ of described soft basic unit asolubility parameter δ with described high rigidity overlayer rubber constituent bthere is following relational expression: δ a-δ b>=2.8(J/cm 3) 1/2; The softening agent solubility parameter δ of described soft basic unit asolubility parameter δ with described soft basic unit rubber constituent cthere is following relational expression: ︱ δ a-δ c︱≤1.5(J/cm 3) 1/2.
2. conducting rubber roller according to claim 1, is characterized in that: described soft basic unit is mixed with conductive black, metal powder or the ionic conductive agent of 1%-50% by its hardness, resistance requirement.
3. conducting rubber roller according to claim 1, is characterized in that: the electronic conductor that is filled with 1%-70% in described high rigidity overlayer by its hardness, resistance requirement.
4. conducting rubber roller according to claim 1, is characterized in that: the softening agent solubility parameter δ that is filled in described soft basic unit aat 14-25(J/cm 3) 1/2scope in.
5. conducting rubber roller according to claim 1, it is characterized in that: paraffin oils, naphthenic oil or hydrocarbon oil that the softening agent that is filled in described soft basic unit is petroleum, coal tar or the coumarone of coal tar system, ointment, glycerine or the castor oil of fat oil system, pine tar, rosin or the tall oil of pine tar system, and one or more mixing in the phthalate esters of synthesizing ester, aliphatic dicarboxylic acid esters class or phosphoric acid ester.
6. conducting rubber roller according to claim 1, is characterized in that: described soft basic unit and the tectal material of high rigidity are non-foam material.
7. an imaging device, is characterized in that: have the conducting rubber roller described in claim 1-6 any one.
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CN105131440B (en) * 2015-09-24 2017-12-22 四川大学 A kind of high rigidity low compression set elastomeric material and preparation method thereof
CN107057131B (en) * 2017-05-09 2018-06-05 河北春风银星胶辊股份有限公司 A kind of industrial rubber roller of high low-hardness rubber inter-embedding type and its production method
JP7075591B2 (en) * 2018-06-12 2022-05-26 住友ゴム工業株式会社 Develop roller
JP2020186317A (en) * 2019-05-15 2020-11-19 三菱重工業株式会社 Rubber material recovery method and oil product
JP2022085460A (en) * 2020-11-27 2022-06-08 コニカミノルタ株式会社 Soft tube and manufacturing method thereof and sheet conveying roller and manufacturing method thereof

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JP5188681B2 (en) * 2006-04-14 2013-04-24 住友ゴム工業株式会社 Semiconductive rubber member and developing roller comprising the rubber member
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