CN103631114A - Developing roller and imaging equipment - Google Patents
Developing roller and imaging equipment Download PDFInfo
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- CN103631114A CN103631114A CN201310723834.0A CN201310723834A CN103631114A CN 103631114 A CN103631114 A CN 103631114A CN 201310723834 A CN201310723834 A CN 201310723834A CN 103631114 A CN103631114 A CN 103631114A
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Abstract
The invention relates to a developing roller. The developing roller comprises a metal shaft core, an elastic rubber layer covering the periphery of the metal shaft core and a surface layer covering the outer surface of the elastic rubber layer, wherein the elastic rubber layer is mainly formed by compounding butadiene rubber and nitrile rubber, the volume resistance of the elastic rubber layer is 103-1012 ohm.cm, wherein the butadiene rubber accounts for 50-90%wt of the total mass of the elastic rubber layer; the surface layer is a cationic modified water-based antistatic coating layer formed by styrene-acrylate resin, and the volume resistance of the surface layer is 105-1012 ohm.cm. The surface layer of the developing roller selects the cationic modified styrene-acrylate resin as a water-based antistatic coating, so that good electrical conductivity can be maintained without an additional conductive agent, higher electrical quantity can be provided for powdered ink, and the powdered ink can be easily separated and cannot pollute a photosensitive drum after being placed for a long time. The prepared developing roller has the characteristics of enabling the electrical quantity of the powdered ink to be higher, not polluting the photosensitive drum and the like so as to prevent the occurrence of printing defects such as backgrounclig and ghosting.
Description
[technical field]
The present invention relates to imaging device technical field, relating in particular to is to be applied to ink powder to be transferred to electrostatic latent image carrying structure (photosensitive drums) in printer, duplicating machine make electrostatic latent image form developer roll and the imaging device of visible ink powder image.
[background technology]
Printer, duplicating machine are all to be built (also claiming photosensitive drums), for the charging roller of photosensitive drum charging, by ink powder, be transferred to that photosensitive drums makes electrostatic latent image form the developer roll of visible ink powder image, the conducting resinl rubber rolls such as transfer roll that ink powder is transferred on other medium by photosensitive drums form by electrostatic latent image carrying.
In recent years, the imaging device that the printer of take is representative had obtained universal widely in daily life, and the miniaturization of printer has become a kind of trend.The printer course of work mainly comprises charging, exposure, development, transfer printing, photographic fixing, clean six processes, wherein controls the key influence factor that ink powder carried charge is whole developing process and print quality quality.
In addition, containing the single component low melting point ink powder of magnetic, do not become the development trend of present ink powder.The ceaselessly friction repeatedly between each member of this class low melting point ink powder, causes that reunion, the lower-molecular substance of ink powder are separated out etc., thereby causes low ash to wait print defect.So the developer roll of low-friction coefficient becomes a kind of development trend.Past people use urethane resin as developing roller surface layer, reach the method for improving developer roll friction factor, but well-known, polyurethane friction factor is larger, when long-term printing, can produce a large amount of heat, thereby therefore cause print quality to decline thereby cause ink powder deliquescing to stick on developer roll and OPC, and urethane resin electric conductivity is very poor, conventionally need to add a large amount of conductive materials to adjust the electric conductivity of its resin, if use electronic conductor as carbon black etc., interpolation along with conductive material, the hardness of cold coating can increase, thereby cause in ink powder print procedure ink powder easily at rubber roll surface filming, while rubber roll permanance, adhesion all can decline.Therefore print permanance and significantly decline, if use ionic conductive agent, little molecule conductive agent is separated out and is had the risk of polluting photosensitive drums.
In order to address the above problem, thereby the disclosed patent documentation CN1203385A of Patent Office of the People's Republic of China proposes to change acryl resin with silicon to be reached and reduces rubber roll friction factor and prevent ink powder deliquescing as the superficial layer of rubber roll, but uses the ink powder carried charge of this resin very low.
[summary of the invention]
The object of the invention is to overcome the defect of prior art, provides a kind of ink powder that can make to have higher carried charge, and can make ink powder be easy to depart from, and long-term printing can not polluted the developer roll of photosensitive drums.
The invention provides a kind of developer roll, comprise metal shaft core, be covered in the elastic rubber layer of this metal shaft core periphery and be covered in the superficial layer of described elastic rubber layer outside surface, described elastic rubber layer is mainly composited by butadiene rubber and nitrile rubber, the mass parts of wherein said butadiene rubber accounts for the 50-90% wt of elastic rubber layer gross mass part, and described elastic rubber layer volume resistance is controlled at 10
3-10
12Ω .cm; Described superficial layer is the aqueous antistatic coating layer that cation-modified styrene-acrylic resin forms, and described superficial layer volume resistance is controlled at 10
5-10
12Ω .cm.
The present invention also provides a kind of imaging device, has developer roll described above.
Developer roll provided by the invention, its superficial layer selects cation-modified styrene-acrylic resin to form aqueous antistatic coating, do not need additional conductive agent just can keep good electric conductivity, and can provide the carried charge that ink powder is higher, can make ink powder be easy to depart from, long-term placement can not polluted photosensitive drums.
Adopt the imaging device of above-mentioned developer roll, have the ink powder of making carried charge higher, do not pollute the characteristics such as photosensitive drums, thereby can prevent the appearance of the print defects such as bottom ash, ghost.
[accompanying drawing explanation]
Fig. 1 is the structural representation of developer roll 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 superficial layer 3 that developer roll example structure provided by the invention comprises metal shaft core 1, covers the elastic rubber layer 2 of this metal shaft core 1 periphery and be covered in elastic rubber layer outside surface.
Described metal shaft core 1 material is not particularly limited, and specifically can use the metal materials such as stainless steel, aluminium, iron, nickel, aluminium alloy, also can consist of electroconductive resin.
Rubber in described elastic rubber layer 2 is mainly composited by nitrile rubber and butadiene rubber.Wherein butadiene rubber mass parts is controlled at the 50%-90%wt of the rubber gross mass part in elastic rubber layer 2, and the content of nitrile rubber is controlled at 10%-50%wt.For butadiene rubber, if content lower than 50%wt, the elasticity of developer roll elastic rubber layer 2 will variation, if higher than 90%wt, the resistance of whole elastic rubber layer 2 rubbery systems can uprise, processing characteristics also can variation.For nitrile rubber, if content, lower than 10%wt, can not well guarantee the resistance of elastic rubber layer 2 formula systems, if higher than 50%wt, the mixing property of elastic rubber layer 2 rubber is, the abrasive property of whole developer roll and dimensional accuracy all can variation.For nitrile rubber, can use acrylonitrile content at the nitrile rubber of more than 43% high acrylonitrile content, or acrylonitrile content is at the nitrile rubber of the high acrylonitrile content of 36-43%, or the nitrile rubber of the middle acrylonitrile content of acrylonitrile content 25-35%, also can use acrylonitrile content at the low acrylonitrile content nitrile rubber below 24%.But consider environmental stability, preferably acrylonitrile content is at the nitrile rubber of 25-35%.For butadiene rubber, can use any a butadiene rubber on the market, can use non-oil-extended butadiene rubber, as BR9000, BR9002, BR9003, BR9004, BR9100 etc.; Also can use oil-extended butadiene rubber, as BR9175, BR9075, BR9073 etc.But consider the pollution condition to OPC, preferred non-oil-extended butadiene rubber.
Further, in order to guarantee good elasticity and compression set thereof, the hardness of elastic rubber layer 2 is done to certain restriction, its ASKER A is controlled between 45 °-80 °, preferably between 50 °-65 °.If the hardness of elastic rubber layer 2 is lower than 45 °, thereby need to add little molecule plastifier to cause compression set obviously to increase, long-term printing can produce an impression, and small-molecule substance is separated out and can be polluted photosensitive drums and ink powder.If the hardness of elastic rubber layer 2 is higher than 80 °, the integral hardness of developer roll can increase, thereby can not control well roll-gap width, the drawback such as easily cause ink powder to be reunited, lower-molecular substance is separated out.
While existing the poor and addition of environmental stability large due to the ionic conduction system of the conductive agent in existing developer roll elastic rubber layer 2 as antistatic agent etc., can cause developer roll compression set large, separate out the problem of polluting photosensitive drums.Therefore, conductive agent in developer roll elastic rubber layer 2 of the present invention is selected electronic conduction system, for conductive agent, there is no special requirement, can use carbon black, graphite, iron oxide, aluminium oxide, antimony oxide etc., but consider cost and source suggestion use carbon black, concrete can use the conductive carbon blacks such as Ketjen black, acetylene black, also can use the rubber grade carbon blacks such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, MT.Use amount should be controlled at the 20%-50% of rubber general assembly (TW).If can not well control the resistance value of elastic layer lower than 20%wt, if little to elastic layer Resistance Influence higher than 50%wt, can make hardness seriously increase simultaneously.For elastic rubber layer 2, its volume resistance is controlled at 10 as far as possible
3-10
12Ω .cm.
For being covered in above-mentioned elastic rubber layer 2 outside surface superficial layers 3, be to be the aqueous antistatic coating layer that main body forms by containing cation-modified styrene acrylic resin emulsion components.The concrete component of described water antistatic coating layer is: cation-modified styrene-acrylic resin emulsion 50-70%wt, deionized water 5-25%wt, aqueous paint additive 0.1-10%wt, teflon 1-15%wt.
Wherein the Tg of cation-modified styrene-acrylic resin is-40-70 ℃, forms styrene structure monomer in cation-modified styrene-acrylic resin and is selected from least one in the aromatic vinyl monomers such as styrene, methyl styrene, α-methyl styrene; Acrylate structural monomer is selected from least one in methyl acrylate, butyl acrylate, ethyl acrylate, isobutyl acrylate, Isooctyl acrylate monomer, cyclohexyl acrylate, methacrylic acid, methyl methacrylate, β-dimethyl-aminoethylmethacrylate; Cation mono body structure be selected from (methyl) dimethylaminoethyl acrylate, (methyl) acrylic acid lignocaine ethyl ester, (methyl) acrylyl oxy-ethyl-trimethyl salmiac, have amine or ammonium salt at least one, its content is the 5%-30%wt of described cation-modified styrene-acrylic resin content of monomer.
Described cation-modified styrene-acrylic resin molecular weight should be controlled at 10000-100000, and the surface resistance of its superficial layer should be controlled at 10
5-10
12Ω.
Wherein form cation-modified styrene-acrylic resin aqueous antistatic coating and also need to add aqueous paint additive, mainly comprise levelling agent, wetting agent, defoamer, wherein levelling agent can be used organosilicon type, acrylic type, can use on the market any one or two kinds of above-mentioned levelling agents, wetting agent can be used non-ionic surfactant, Siloxane-Oxyalkylene Copolymers compounds, acetylenic diols compound etc., but requirement can not be used anionic surfactant, can use on the market any one or two kinds of above-mentioned wetting agents, defoamer can be used organic silicon surfactant, organic alcohols compound, can use on the market any one or two kinds of above-mentioned defoamers.
Also to need to add teflon be the 1-15%wt of cation-modified styrene-acrylic resin in order to increase coating film forming rear surface smoothness wherein to form cation-modified styrene-acrylic resin aqueous antistatic coating.
Described cation-modified styrene-acrylic resin aqueous antistatic coating can make ink powder have higher carried charge, thereby prevents in print procedure due to the too low print defects such as bottom ash that produce of ink powder carried charge.
For the preparation that contains cation-modified styrene-acrylic resin emulsion, can use the mode of emulsion polymerization and use non-ionic surfactant as emulsifying agent, can use on the market any one non-ionic emulsifier as condensation compound of alkyl phenol and epoxy ethane, APES class, sorbitan fatty acid ester etc., wherein non-ionic surfactant accounts for the 2%-10%wt of styrene structure monomer and acrylate structural total monomer weight, preferred 1.5%-5%wt, use positive lauryl mercaptan as chain-transferring agent, account for the 0.3%-8%wt of styrene structure monomer and acrylate structural total monomer weight, preferred 1%-5%wt, use azo-bis-isobutyrate hydrochloride (V-50) as initiating agent, account for the 0.3%-5%wt of styrene structure monomer and acrylate structural total monomer weight, preferred 1%-3%wt.Cation-modified styrene-acrylic resin emulsion solid content is 20-40%wt.
Particularly, contain cation-modified styrene-acrylic resin emulsion preparation method:
1) by weight, be that described styrene structure monomer and the non-ionic surfactant of acrylate structural total monomer weight 2%-10%wt, the deionized water of 50%-90%wt are placed in reactor, stir and be warming up to 50 ℃-70 ℃;
2) add the 70%wt of initiating agent total amount, after 3-5 min, start to drip styrene structure monomer, acrylate structural monomer, the positive lauryl mercaptan of cationic monomer and chain-transferring agent, wherein by adjusting the ratio of styrene and acrylate structural monomer, control resin Tg within the scope of-40 ℃-70 ℃, optimization styrene and butyl acrylate, both mass fractions are controlled within the scope of 15:85-88:12, cationic monomer accounts for the 5%-30%wt of styrene and acrylate structural monomer gross mass, the positive lauryl mercaptan of chain-transferring agent accounts for the 0.3%-8%wt of styrene and acrylate structural monomer gross mass, guarantee that monomer drips within 1h-2 h,
3), after monomer dropping, it is that 2% aqueous solution drips that remaining initiating agent is mixed with to concentration, guarantees to complete dropping in 20-30min;
4) dropwise, after 5-10 min, be warming up to 70 ℃-85 ℃, react to no longer including monomers flow back in system and finish.
The preparation method of antistatic coating of the present invention:
1) the cation-modified styrene-acrylic resin emulsion of above-mentioned preparation is placed in to a large container with cover, starts to stir 300-500 rpm;
2) under the condition stirring, by proportioning, add deionized water, aqueous paint additive, and keep stirring 15-30min;
3) under the condition stirring, by proportioning, continue to add ptfe emulsion, and keep stirring 10-25 min, discharging.
The preparation method of developer roll of the present invention:
1) use internal rubber mixer or opening rubber mixing machine, mastication nitrile rubber and butadiene rubber, then by quality, be the zinc paste of rubber gross mass 1%-8%wt, the calcium carbonate of the stearic acid of 1%-5%wt, 10%-30%wt, the sulphur of the carbon black of 5%-40%wt, 1%-5%wt drop in rubber mixing machine, add in above-mentioned elastomeric compound, and be uniformly dispersed, obtain conducting electricity elastomeric compound;
2) by standard single pole extruder for shaping for above-mentioned conduction elastomeric compound, in forming process, place therebetween metal shaft core 1;
3) above-mentioned preformed rubber roll is put into convection oven, under the condition of 100-130 ℃, heating 10-30 min, carries out presulfurization, then convection oven Temperature Setting is made to its real moulding at 150-180 ℃ of sulfuration 10-20 min;
4) use emery wheel that rubber roll skin is ground away, and controlling dimension, elastic rubber layer formed; 2
5) clean described elastic rubber layer 2 surfaces and dry surperficial moisture, use the mode of spraying or dip-coating that described antistatic coating is coated on to described elastic rubber layer outside surface formation superficial layer 3, and use convection oven to carry out the dry processing of solidifying of surface, make it form the developer roll of structure shown in Fig. 1.
Imaging device of the present invention adopts above-mentioned developer roll.
Below in conjunction with embodiment, the preparation of developer roll of the present invention is further described.
Embodiment 1:
1, contain cation-modified styrene-acrylic resin emulsion preparation:
1) take styrene 70 weight portions, 42 parts of butyl acrylates, 2.24 parts of positive lauryl mercaptans, 10 parts of MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chlorides, then the deionized water that accounts for the non-ionic surfactant of styrene, butyl acrylate general assembly (TW) 3.5% and account for styrene, butyl acrylate general assembly (TW) 80% is placed in to reactor, stirs and be warming up to 50 ℃-70 ℃;
2) take the initiating agent azo-bis-isobutyrate hydrochloride that weight is styrene, butyl acrylate and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride general assembly (TW) 1.5%, then the 70%wt of azo-bis-isobutyrate hydrochloride total amount is added in reactor, after 3-5 min, start to drip 10 parts of styrene 70 weight portions, 42 parts of butyl acrylates and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chlorides, 2.24 parts of positive lauryl mercaptans, guarantee that monomer drips within 1 h-2 h;
3), after each monomer dropping, it is that 2% aqueous solution drips that remaining initiating agent azo-bis-isobutyrate hydrochloride is mixed with to concentration, guarantees to complete dropping in 20-30 min;
4) dropwise, after 5-10 min, be warming up to 70 ℃-85 ℃, react to no longer including monomers flow back in system and finish.
2, superficial layer---the preparation of antistatic coating layer:
1) the cation-modified styrene-acrylic resin emulsion that accounts for antistatic coating gross mass 60% of above-mentioned preparation is placed in to a large container with cover, starts to stir 300-500 rpm;
2) under the condition stirring, add and account for the deionized water of antistatic coating gross mass 20%, 10% aqueous paint additive, and keep stirring 15-30 min;
3) under the condition stirring, continue to add the ptfe emulsion that accounts for antistatic coating gross mass 10%, and keep stirring 10-25 min, discharging.
3) preparation of developer roll:
By 20 parts of nitrile rubbers, 80 parts of butadiene rubbers; 5 parts, zinc paste, 1 part of stearic acid, 20 parts, calcium carbonate, 30 parts of carbon blacks, 1.5 parts, sulphur, on opening rubber mixing machine or internal rubber mixer, they are mixing evenly, obtain conductive rubber composition I.
By standard single pole extruder for shaping for above-mentioned rubber composition I, in forming process, place therebetween metal shaft core 1, make it form the developer roll of structure shown in Fig. 1.
Then this preformed rubber roll is put into convection oven, under the condition of 100-130 ℃, heating 10-30 min, carries out presulfurization, then convection oven Temperature Setting is made to its real moulding at 150-180 ℃ of sulfuration 10-20 min.
Finally use emery wheel that rubber roll 2 skins are ground away, and controlling dimension, elastic rubber layer 2 made.
Clean elastic rubber layer 2 surfaces and dry its surperficial moisture, using the mode of spraying or dip-coating that the antistatic coating of above-mentioned preparation is covered in to elastic rubber layer 2 skins, forming superficial layer 3, then using convection oven to carry out the curing processing on surface.
Other embodiment that adopt above-mentioned steps preparation table surface layer and developer roll in table 1 and table 2, have also been listed.
Embodiment 2:
In the present embodiment, outside desurfacing use resin II is different from embodiment 1, all the other are all identical with embodiment 1.
Comparative example 1:
In the present embodiment, outside desurfacing use resin V is different from embodiment 1, all the other are all identical with embodiment 1.
Comparative example 2:
In the present embodiment, outside desurfacing use resin VI is different from embodiment 1, all the other are all identical with embodiment 1.
Comparative example 3, comparative example 4:
Outside comparative example 3, comparative example 4 desurfacing resin kinds are different from embodiment 1, all the other are all identical with embodiment 1, and wherein comparative example 3 is used resin VII as surface resin layer, and comparative example 4 is used resin VIII as superficial layer.
Comparative example 5
Outside comparative example 5 is different from embodiment 1 desurfacing antistatic coating, all the other are all identical with embodiment 1, wherein in the antistatic coating of comparative example 5 superficial layers, have added the carbon black conductive agent of 15%wt.
Above-mentioned experimental result is in Table 1 and table 2.
Table 1
Table 2
By table 1 and table 2, can be seen:
Comparative example 1:
Because surface resin layer Tg exceeds the scope that we stipulate, resin is too soft, print procedure floating coat serious wear, and later stage coating has obscission, and under the condition of 40 ℃ * 80%, is OPC and pollutes experiment and ink powder pollution experiment, all presents contamination phenomenon.
Comparative example 2:
Because surface resin layer Tg exceeds the scope that we stipulate, resin is too hard, causes ink powder in developing roller surface film forming in print procedure.
Comparative example 3:
Because the use amount of cationic monomer has exceeded our specialized range, cold coating shows that extremely strong water wettability causes ink powder carried charge to reduce, thereby and ink powder can be in the developing roller surface film forming of making moist under hot and humid condition.
Comparative example 4:
Owing to not adding cationic monomer, thereby cause superficial layer insulation, along with the carrying out of print procedure, the residual charge of developing roller surface is difficult to release, so print, occurs the print defects such as bottom ash, ghost mid-term.
Comparative example 5:
Owing to using carbon black to cause as conductive agent that coating hardness increases, adhesion declines, although initial stage printing test is all right, along with the lengthening coating durability of time-write interval obviously declines, print 3000 pages after coating have slight obscission.
Surface resistance method of testing:
By antistatic coating spraying or dip-coating on an insulation ground (it is 100mm that this ground requires as square trimming is long), use air dry oven to make its crosslinking curing to its heating.Under the condition of 25 ℃ * 55%, use the surface resistance of high resistance tester test antistatic coating.The results are shown in Table 1.
Photosensitive drums is polluted experiment test method:
Conductive rollers is contacted with Electrifier frame, photoreceptor, then 1000g load is put on to metal shaft core two ends, under 40 ℃/95% condition, place 1 day.After placement, remove load, then by the attachment on microscopic examination Electrifier frame, photoreceptor, thereafter the Electrifier frame, photoreceptor of use is arranged in print cartridge, print 30 filled black images, the image that visual valuation obtains.The results are shown in Table 2.
Ink powder carried charge testing tool:
Under the condition of 25 ℃ * 55%, use the carried charge of TREK MODEL212HS Q/M METER tester test ink powder.
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 (11)
1. a developer roll, it is characterized in that, comprise metal shaft core, be covered in the elastic rubber layer of this metal shaft core periphery and be covered in the superficial layer of described elastic rubber layer outside surface, described elastic rubber layer is mainly composited by butadiene rubber and nitrile rubber, the mass parts of wherein said butadiene rubber accounts for the 50-90% wt of elastic rubber layer gross mass part, and described elastic rubber layer volume resistance is controlled at 10
3-10
12Ω .cm; Described superficial layer is the aqueous antistatic coating layer that cation-modified styrene-acrylic resin forms, and described superficial layer volume resistance is controlled at 105-1012 Ω .cm.
2. developer roll according to claim 1, is characterized in that, in described nitrile rubber, acrylonitrile content is 25-35%, and described butadiene rubber is selected non-oil-extended butadiene rubber.
3. developer roll according to claim 1, is characterized in that, described cation-modified styrene-acrylic resin molecular weight is controlled at 10000-100000.
4. according to the developer roll described in claim 1-3 any one, it is characterized in that, the concrete component of described water antistatic coating layer is: cation-modified styrene-acrylic resin emulsion 50-70%wt, deionized water 5-25%wt, aqueous paint additive 0.1-10%wt, teflon 1-15%wt.
5. developer roll according to claim 4, it is characterized in that, the Tg of described cation-modified styrene-acrylic resin is-40 ℃-70 ℃, the styrene structure monomer wherein forming in described cation-modified styrene-acrylic resin is selected from aromatic vinyl monomer, among optimization styrene, methyl styrene or α-methyl styrene at least one.
6. developer roll according to claim 4, it is characterized in that, the Tg of described cation-modified styrene-acrylic resin is-40 ℃-70 ℃, and the acrylate structural monomer wherein forming in described cation-modified styrene-acrylic resin monomer is selected from least one in methyl acrylate, butyl acrylate, ethyl acrylate, isobutyl acrylate, Isooctyl acrylate monomer, cyclohexyl acrylate, methacrylic acid, methyl methacrylate or β-dimethyl-aminoethylmethacrylate.
7. developer roll according to claim 4, it is characterized in that, form cationic structural monomer in described cation-modified styrene-acrylic resin monomer be selected from (methyl) dimethylaminoethyl acrylate, (methyl) acrylic acid lignocaine ethyl ester, (methyl) acrylyl oxy-ethyl-trimethyl salmiac, have amine or ammonium salt at least one, its content is the 5%-30%wt of described cation-modified styrene-acrylic resin monomer weight.
8. developer roll according to claim 4, is characterized in that, described cation-modified styrene-acrylic resin emulsion preparation comprises the steps:
1) by weight, be that non-ionic surfactant, the weight of described styrene structure monomer and acrylate structural total monomer weight 2%-10%wt is the deionized water of described styrene structure monomer and acrylate structural total monomer weight 50%-90%wt, be placed in reactor, stir and be warming up to 50 ℃-70 ℃;
2) add the 70%wt of initiating agent total amount, wherein said initiating agent accounts for the 0.5%-5% of cation-modified styrene-acrylic resin monomer, after 3-5 min, start to drip styrene structure monomer, acrylate structural monomer, the positive lauryl mercaptan of cationic monomer and chain-transferring agent, wherein by adjusting the ratio of styrene and acrylate structural monomer, control resin Tg within the scope of-40 ℃-70 ℃, both mass fractions are controlled within the scope of 15:85-88:12, cationic monomer accounts for the 5%-30%wt of styrene and acrylate structural monomer gross mass, the positive lauryl mercaptan of chain-transferring agent accounts for the 0.3%-8%wt of styrene and acrylate structural monomer gross mass, within 1 h-2 h, drip,
3), after monomer dropping, it is that 2% aqueous solution drips that remaining initiating agent is mixed with to concentration, guarantees to complete dropping in 20-30min;
4) dropwise, after 5-10 min, be warming up to 70 ℃-85 ℃, react to no longer including monomers flow back in system and finish.
9. developer roll according to claim 8, is characterized in that, the preparation of described antistatic coating comprises the steps:
1) the cation-modified styrene-acrylic resin emulsion of above-mentioned preparation is placed in to container, starts to stir 300-500 rpm;
2) under the condition stirring, by proportioning, add deionized water, aqueous paint additive, and keep stirring 15-30min;
3) under the condition stirring, continue to add ptfe emulsion by proportioning, and keep stirring 10-25 min, discharging.
10. developer roll as claimed in claim 9, is characterized in that comprising following preparation process:
1) use internal rubber mixer or opening rubber mixing machine, mastication nitrile rubber and butadiene rubber, then by quality, be the zinc paste of rubber gross mass 1%-8%wt, the calcium carbonate of the stearic acid of 1%-5%wt, 10%-30%wt, the sulphur of the carbon black of 5%-40%wt, 1%-5%wt drop in rubber mixing machine, add in above-mentioned elastomeric compound, and be uniformly dispersed, obtain conducting electricity elastomeric compound;
2) by standard single pole extruder for shaping for above-mentioned conduction elastomeric compound, in forming process, place therebetween metal shaft core;
3) above-mentioned preformed rubber roll is put into convection oven, under the condition of 100-130 ℃, heating 10-30 min, carries out presulfurization, then convection oven Temperature Setting is made to its real moulding at 150-180 ℃ of sulfuration 10-20 min;
4) use emery wheel that rubber roll skin is ground away, and controlling dimension, elastic rubber layer formed;
5) clean described elastic rubber layer surface and dry surperficial moisture, using the mode of spraying or dip-coating that described antistatic coating is coated on to described elastic rubber layer outside surface formation superficial layer, and use convection oven to carry out surperficial dry processing of solidifying.
11. 1 kinds of imaging devices, is characterized in that: comprise the developer roll described in claim 1-10 any one.
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| CN201310723834.0A CN103631114B (en) | 2013-12-24 | 2013-12-24 | Developer roll and imaging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113861698A (en) * | 2021-10-29 | 2021-12-31 | 广东乐普泰新材料科技有限公司 | Heat-conducting antistatic silicone rubber and preparation method of silicone rubber developing roller thereof |
| CN113960904A (en) * | 2021-10-29 | 2022-01-21 | 广东乐普泰新材料科技有限公司 | Polyurethane water-based antistatic coating and preparation method of developing roller thereof |
| CN117050590A (en) * | 2023-07-18 | 2023-11-14 | 昆山市奋发绝缘材料有限公司 | Teflon roller and production process thereof |
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| CN113960904B (en) * | 2021-10-29 | 2024-04-30 | 广东乐普泰新材料科技有限公司 | Polyurethane water-based antistatic coating and preparation method of developing roller thereof |
| CN117050590A (en) * | 2023-07-18 | 2023-11-14 | 昆山市奋发绝缘材料有限公司 | Teflon roller and production process thereof |
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| CN103631114B (en) | 2016-04-20 |
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