CN103555175A - Water-based development coating for laser imaging equipment and development roller of laser imaging equipment - Google Patents
Water-based development coating for laser imaging equipment and development roller of laser imaging equipment Download PDFInfo
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Abstract
The invention provides a water-based development coating for laser imaging equipment. The water-based development coating comprises a coating main material and a curing agent, wherein the curing agent accounts for 1 to 5 weight percent of the total quantity of the coating main material; the coating main material comprises water-based carbon nano tube conductive dielectric slurry, film-forming resin and a film-forming aid; the water-based carbon nano tube conductive dielectric slurry accounts for 5 to 30 weight percent of the total quantity of the coating main material; the film-forming resin accounts for 50 to 70 weight percent of the total quantity of the coating main material; the film-forming aid accounts for 3 to 5 weight percent of the total quantity of the coating main material; the water-based carbon nano tube conductive dielectric slurry and the film-forming resin are mixed according to the ratio, and the film-forming aid is added; after a pH value is adjusted, the coating main material is prepared through shearing and stirring, and the coating main material and the curing agent are mixed according to the ratio. The invention also provides a development roller of the laser imaging equipment. The coating is applied to the outer surface of the development roller. The good carbon powder electrification quantity of a laser printer and a copying machine can be obtained, the good physical performance can be obtained, and requirements on the durability of the laser imaging equipment can be met.
Description
[technical field]
The present invention relates to imaging device printer or copier technology field, relate in particular to a kind of printer or duplicating machine developing roller surface water-based development coating of spraying to.
[background technology]
In the developing process of the imaging devices such as printer, duplicating machine, suitable ink powder carried charge and upper powder amount are the essential condition that obtains high quality graphic.The surface property of developer roll, as volume resistance, wear resistance and surfaceness etc., has important impact to the carried charge of ink powder and upper powder amount, strictly controls the volume specific resistance of developer roll 10
2-10
7Ω cm.The volume specific resistance of developer roll, within above-mentioned scope, can make developing roller surface moderately control charge leakage.The coating that proposes technical scheme in the disclosed document CN200810003309.0 of Patent Office of the People's Republic of China and be to add semiconductor property on the surface of developer roll is to improve the surface property of developer roll, make to print that carbon dust is charged evenly avoids the uneven phenomenon of developing, thereby obtain suitable ink powder carried charge and upper powder amount.
Whether electrically conducting coating conducts electricity and can be divided into two kinds, blending type and conductor type by filmogen.Filmogen itself can conduct electricity, and the coating that does not need to add again other electro-conductive material is this build electrically conducting coating, the synthetic difficulty of this class coating, and cost is higher.The coating that makes it to have electroconductibility by add conductive filler material in nonconducting emulsion is called blending type electrically conducting coating, and this class electrically conducting coating has synthetic simple, and the feature that cost is low, applies comparatively extensive.Water-borne coatings is as a kind of brand-new green environmental friendly coatings, and because it is not containing organic volatile component, environmentally safe, is widely used in industries such as automobile, building, electronics.Conventional conductive filler material one class is inorganic materials at present, and another kind of is conducting high polymers thing.
The disclosed document CN101108947A of Patent Office of the People's Republic of China, CN101508855A, CN1221768A, in ZL200510050812.8 and CN101935489A, inorganic materials is to take graphitized carbon black, graphite, metal-powder etc. as main, there is compatibility problem in these inorganic conductive fillers and polymer emulsion, has reduced the mechanical property of paint film.
And at patent documentation CN102070960A, CN102002314A, in CN101418122A, conductive polymers is added into coating, and consistency is good, but cost is relatively high.The conductive coating of inorganic conductive filler due to mineral filler and polymer emulsion consistency poor, the difficult homogeneous system that forms, the conductivity of filming is bad.Laser printer carries out printing continuously there will be prints the phenomenon that carbon dust carried charge raises; The much smaller static inhibitor of interpolation molecular weight ratio superpolymer can obtain good printing carbon and divide carried charge.But add antistatic coating prepared by low molecular weight substance may make the physical and mechanical properties of high polymer material worsen, make coating itself aging fast, cannot guarantee the needs of durable printing.
Since the Iijima of Japanese NEC Corporation in 1991 finds carbon nanotube (Carbon Nanotube, be called for short CNT) at first, and caused very soon the attention of scientific circles and industrial community.Carbon nanotube has good machinery and photoelectric properties, and there is the performances such as antistatic and electromagnetic shielding, the high-specific surface area of carbon nanotube and high length-to-diameter ratio, good mechanics electric property is considered to the desirable weighting material of polymer materials, and carbon nano-tube/polymer composite material has become the focus of World Science research.Yet the molecular weight that carbon nanotube is huge (bad dispersibility, easily reunion), has seriously hindered the application of carbon nano-tube/polymer composite material.
[summary of the invention]
Technical problem to be solved by this invention is the defect that overcomes above-mentioned prior art, a kind of imaging device use development coating of carbon nanotube as conducting medium of usining is provided, the coating making can obtain good laser printer and duplicator carbon dust carried charge, good physicals, can meet the durable requirement of laser imaging apparatus.
For achieving the above object, first the present invention provides a kind of laser imaging apparatus use development coating, and it comprises coating major ingredient and solidifying agent, and described solidifying agent accounts for the 1-5wt% of described coating major ingredient total amount; Described coating major ingredient comprises water-based carbon nanotube conducting dielectric paste, film-forming resin and film coalescence aid, and wherein said water-based carbon nanotube conducting dielectric paste accounts for the 5-30wt% of described coating major ingredient; Described film-forming resin accounts for the 50-70wt% of described coating major ingredient total amount; Described film coalescence aid accounts for the 3-5wt% of described coating major ingredient; After described water-based carbon nanotube conducting dielectric paste is mixed according to said ratio with described film-forming resin, add described film coalescence aid, adjust after pH value, by shear agitation, be prepared into coating major ingredient, then by proportioning, mix with described solidifying agent.
Compared with prior art, in laser imaging apparatus use development coating provided by the invention, using carbon nanotube as conducting medium, it has following technique effect: (1) contains the hydrophilic radicals such as amide group or imine group because the multi-walled carbon nano-tubes as conducting medium carries out acidification rear surface, can prepare the water-based carbon nanotube conducting slurry that consistency is good; (2) water-based carbon nano tube paste and the water-base resin system prepared have preferably consistency, carbon nanotube conducting medium can be able to dispersed in coating system, overcome that existing carbon nanotube dispersed is poor, the shortcoming of easy reunion, coating is dispersed and be interconnected to form conductive network after spraying coating process film forming, for the raising of coatings conductive property provides sound assurance; (3) carbon nanometer tube has excellent conductivity as conducting medium, can obtain good printing carbon dust carried charge and upper powder amount; (4) preparation method's technique of water-based development coating is simple, the cost of material adopting is cheap, tooling cost is low, the developer roll coating of preparation has good anti-static function and ageing-resistant performance, when printing, there is good development effect and weather resistance, can realize scale serialization and produce, there is good marketable value.
The present invention also provides a kind of laser imaging apparatus developer roll, and by spray above-mentioned water-based development coating on developer roll, can form thickness at developer roll outside surface is the coating of 2-10 μ m, and described Surface Resistivity of Coatings is 10
5-10
8Ω/m
2.
Be coated with the developer roll of above-mentioned water-based development paint coatings, obtained on the one hand good printing carbon dust carried charge, improved on the other hand the physicals of developer roll coating itself, as sticking power, weather resistance, wear resistance etc., thereby the defects such as antistatic coating Product Process is complicated, endurance quality is poor, cost is expensive have well been solved, for applying of antistatic coating provides strong assurance.
[accompanying drawing explanation]
Fig. 1 is conductive carbon nanotube slurry and the affect graph of a relation of waterborne film-forming material blending ratio on coatings conductive property;
Fig. 2 is preparation of the present invention and spraying coating process schema;
Fig. 3 is developing roller for laser printer schematic diagram.
[embodiment]
For realizing the object of the invention, below in conjunction with embodiment, 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. 2, first the present invention provides a kind of laser imaging apparatus use development coating, and for being coated on the developer roll outside surface of laser imaging apparatus, it comprises coating major ingredient and solidifying agent, and described solidifying agent accounts for the 1-5wt% of described coating major ingredient total amount; Described coating major ingredient comprises water-based carbon nanotube conducting dielectric paste, film-forming resin and film coalescence aid, and wherein said water-based carbon nanotube conducting dielectric paste accounts for the 5-30wt% of described coating major ingredient; Described film-forming resin accounts for the 50-70wt% of described coating major ingredient total amount; Described film coalescence aid accounts for the 3-5wt% of described coating major ingredient.In said ratio, the ratio of water-based carbon nanotube conducting slurry and film-forming resin consumption is when 5-30wt%, and coating has good electroconductibility, specifically can be referring to Fig. 1.Water-based carbon nanometer tube usage of sizing agent and film-forming resin are during lower than 5wt%, and the electroconductibility of coating own is bad, can not meet the requirement of the printing carbon dust carried charge of developer roll coating used.The consumption of water-soluble carbon nanometer tube slurry and film-forming resin are during higher than 20wt%, and coating electroconductibility is good, but slurry addition is larger on the impact of coating electric conductivity, is also unfavorable for as development coating slurry.During preparation, after described water-based carbon nanotube conducting dielectric paste can being mixed according to said ratio with described film-forming resin, add described film coalescence aid, adjust after pH value, by shear agitation, be prepared into coating major ingredient, then by proportioning, mix with described solidifying agent.
Particularly, described water-based carbon nanotube conducting dielectric paste is to take water-soluble carbon nanometer tube as conducting medium, then mix dispersion agent, wetting agent, defoamer, Diethylene Glycol and deionized water mix, wherein said conducting medium accounts for the 0.5-5wt% of described water-based carbon nanotube conducting dielectric paste total amount, described dispersion agent accounts for the 6-10wt% of described water-based carbon nanotube conducting medium total amount, described wetting agent accounts for the 3-5wt% of described water-based carbon nanotube conducting medium total amount, described defoamer accounts for the 0.1-1.0wt% of described water-based carbon nanotube conducting medium total amount, described Diethylene Glycol accounts for the 5-10wt% of described water-based carbon nanotube conducting medium total amount, deionized water surplus.Experiment showed, when carbon nanotube conducting medium accounts for water paste total amount ratio lower than 0.5wt%, can not substantially improve the conductivity of coating.When carbon nanotube conducting medium accounts for water paste total amount ratio higher than 5wt%, the viscosity of slurry own is larger, is difficult for deaeration, affects the dispersion of waterborne conductive slurry in resin.
Particularly, described conducting medium carbon nanotube is the carbon nanotube that contains amide group, imine group of the surface after acid treatment or the hydrophilic carbon nanotube after silane coupler modified.Because carbon nanotube is more difficult, be dispersed in water-base resin, so need to carry out surface modification to improve its wetting ability to it, be convenient to be dispersed in system.
Particularly, described carbon nanotube is many walls carbon nanometer tube or Single Walled Carbon Nanotube, wherein said multi-walled carbon nano-tubes diameter 10-20nm, length 1-5 μ m, specific surface area 40-300m
2/ g; Described diameter of single-wall carbon nano tube is less than 10nm, length 1-5 μ m, specific surface area 350-450m
2/ g.The carbon nanotube with above-mentioned parameter, its conductivity is better, therefore preferred this type of conductive carbon nanotube.
Particularly, described dispersion agent can be conventional water-borne coatings dispersion agent, do not produce just pollute can, can select at least one in Xylo-Mucine, polyoxyethylene glycol zinc-base phenyl ether or sodium laurylsulfonate; Described wetting agent is the polyether-modified compound of polydimethylsiloxane; Described defoamer is polysiloxane polyether copolymer.
Particularly, described film-forming resin adopts water soluble resin, one or more in optional use polyaminoester emulsion, water-and acrylate emulsion, water-base fluorocarbon emulsion, aqueous alkide resin, aqueous polyester resin, aqueous epoxy resins, water-compatible amino resin and above-mentioned modified resin.
Particularly, described film coalescence aid adopts one or both in alcohols, ester class, alkane ketone, alkoxide, alcohol ethers.
In preparation process, after being mixed according to said ratio with described film-forming resin, described water-based carbon nanotube conducting dielectric paste adds described film coalescence aid, adopting pH value conditioning agent to adjust pH value is 8-10, described pH value conditioning agent is trolamine, monoethanolamine, N, one or more in N-dimethylethanolamine.
Particularly, described solidifying agent adopts a kind of in aziridine crosslinker, epoxy silane compounds, carbodiimide compound, trimeric cyanamide and modified compound thereof, silane coupling agent.Solidifying agent is joined after stirring in water-based development coating major ingredient and sprays under developing roller surface certain condition and can apply after film-forming.
Referring to Fig. 2 and Fig. 3, the present invention also provides a kind of laser imaging apparatus developer roll, comprise roller core 1, be sheathed on the conductive rubber elastomerics 2 on this roller core 1, by spray above-mentioned water-based development coating on developer roll, can form thickness at developer roll outside surface is the coating 3 of 2-10 μ m, and described coating 3 surface resistivities are 10
5-10
8Ω/m
2.
Water-based development coating of the present invention is by adopting carbon nanotube as conducting medium, can improve the static resistance performance and the ageing resistance that are coated on laser imaging apparatus developer roll external surface coating, and in coatings applications, after the long period on rubber roll, still can keep initial antistatic effect, solve the defects such as the complex process that exists in antistatic coating product, poor durability, cost costliness.
Below in conjunction with specific embodiment, the present invention is further described.
The multi-walled carbon nano-tubes that surface contains hydrophilic radical of usining is prepared laser printer use development coating as conducting medium:
Take 5 parts of multi-walled carbon nano-tubes, 1.5 parts of wetting agents, 2.5 parts of dispersion agents, 2.5 parts of Diethylene Glycols, the deionized water of 88 parts is added to sand milling 1-2 hour in sand mill, and then proceed in high speed dispersor and add the defoamer of 0.5 part, under 800-1200rpm, disperse 20-30min, with 100 mesh filter screens, filter and make the electrocondution slurry containing multi-walled carbon nano-tubes.
20 parts of above-mentioned carbon nanotube conducting slurries are joined in 75 parts of aqueous polyurethane emulsions and gone, under the speed stirring of paddle agitator with 200-400rpm, add successively 4.5 parts of film coalescence aid diethylene glycol monomethyl ethers, 0.5 part of trolamine, stirs 20-30min.Through 200 mesh filter screens, filter and to obtain laser printer use development coating major ingredient, using aziridine as water-based development coating linking agent, thereby be prepared into, take the two-pack laser printer use development coating major ingredient that carbon nanotube is conducting medium.
After above-mentioned water-based development coating major ingredient is evenly mixed according to the ratio of 100:2-100:5 with aziridine crosslinker; adopt the coating method of spraying to be sprayed on development rubber roll surface; form one deck even protective membrane of 5 μ m (coating); experiment showed, the requirement that can realize good printing carbon dust carried charge and print weather resistance.
The many walls carbon nanometer tube that acid treatment rear surface contains amide group of usining is prepared laser printer use development coating as conducting medium:
Take surface containing 1.5 parts of multi-walled carbon nano-tubes of hydrophilic radical, add 0.5 part of wetting agent and 1 part of dispersion agent, with 4.5 parts of Diethylene Glycols, the deionized water of 92 parts is added to sand milling 1-2 hour in sand mill, and then proceed to and in high speed dispersor, add the defoamer of 0.5 part, under 800-1000rpm, disperse 30-60min to filter with 100 mesh filter screens, make the multi-walled carbon nano-tubes electrocondution slurry that contains amide group.
25 parts of above-mentioned carbon nanotube conducting slurries are joined in 70 parts of water-based fluoro-silicone emulsions and gone, and the speed of paddle agitator 200-400rpm adds 4.8 parts of film coalescence aid diethylene glycol monomethyl ethers under stirring successively, and 0.2 part of diethanolamine stirs 30-60min.Through 400 mesh filter screens, filter and obtain laser printer use development coating major ingredient, using methyl-etherified terpolycyantoamino-formaldehyde resin as water-based development coating linking agent, thereby be prepared into, take the two-pack laser printer use development coating major ingredient that carbon nanotube is conducting medium.
Water-based is developed after coating major ingredient evenly mixes according to the ratio of 100:3-100:5 with methyl-etherified terpolycyantoamino-formaldehyde resin; adopt the coating method of spraying to be sprayed on development rubber roll surface; form one deck even protective membrane of 10 μ m (coating); experiment showed, and can realize good printing carbon dust carried charge and the requirement to printing weather resistance.
The many walls carbon nanometer tube that acid treatment rear surface contains amide group of usining is prepared laser printer use development coating as conducting medium.
Take surface containing 3 parts of the multi-walled carbon nano-tubes of hydrophilic radical, add 0.5 part of wetting agent (the polyether-modified compound of polydimethylsiloxane) and 1 part of dispersion agent (Xylo-Mucine, at least one in polyoxyethylene glycol zinc-base phenyl ether or sodium laurylsulfonate), with 1.5 parts of Diethylene Glycols, the deionized water of 93 parts is added to sand milling 1-2 hour in sand mill, and then proceed to and in high speed dispersor, add the defoamer of 0.5 part, under 800-1000rpm, disperse 30-60min to filter and make to contain the multi-walled carbon nano-tubes electrocondution slurry that imines is hydrophilic group with 100 mesh filter screens.
With 30 parts of above-mentioned carbon nanotube conducting slurries, in 65 parts of water-and acrylate emulsions, add successively 4.8 parts of film coalescence aid pyrrolidone, N under 200-400rpm paddle agitator stirring action, 0.2 part of N-dimethylethanolamine, stirs 30-60min.Through 400 mesh filter screens, filter and obtain laser printer use development coating major ingredient.Using resin as water-based development coating linking agent.Thereby be prepared into and take the two-pack laser printer use development coating that carbon nanotube is conducting medium.
Water-based is developed after coating major ingredient evenly mixes according to the ratio of 100:3-100:5 with KH-550 silane coupling agent and adopted the coating method of spraying to be sprayed on development rubber roll surface; form the even protective membrane of one deck 2 μ m; experiment showed, and can realize good printing carbon dust carried charge and the requirement to printing weather resistance.
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 (10)
1. laser imaging apparatus use development coating, is characterized in that, comprises coating major ingredient and solidifying agent, and described solidifying agent accounts for the 1-5wt% of described coating major ingredient total amount; Described coating major ingredient comprises water-based carbon nanotube conducting dielectric paste, film-forming resin and film coalescence aid, and wherein said water-based carbon nanotube conducting dielectric paste accounts for the 5-30wt% of described coating major ingredient; Described film-forming resin accounts for the 50-70wt% of described coating major ingredient total amount; Described film coalescence aid accounts for the 3-5wt% of described coating major ingredient; After described water-based carbon nanotube conducting dielectric paste is mixed according to said ratio with described film-forming resin, add described film coalescence aid, adjust after pH value, by shear agitation, be prepared into coating major ingredient, then by proportioning, mix with described solidifying agent.
2. laser imaging apparatus use development coating according to claim 1, it is characterized in that, described water-based carbon nanotube conducting dielectric paste is to take water-soluble carbon nanometer tube as conducting medium, then mix dispersion agent, wetting agent, defoamer, Diethylene Glycol and deionized water mix, wherein said conducting medium accounts for the 0.5-5wt% of described water-based carbon nanotube conducting dielectric paste total amount, described dispersion agent accounts for the 6-10wt% of described water-based carbon nanotube conducting medium total amount, described wetting agent accounts for the 3-5wt% of described water-based carbon nanotube conducting medium total amount, described defoamer accounts for the 0.1-1.0wt% of described water-based carbon nanotube conducting medium total amount, described Diethylene Glycol accounts for the 5-10wt% of described water-based carbon nanotube conducting medium total amount, deionized water surplus.
3. laser imaging apparatus use development coating according to claim 2, it is characterized in that, described conducting medium carbon nanotube is the carbon nanotube that contains amide group, imine group of the surface after acid treatment or the hydrophilic carbon nanotube after silane coupler modified.
4. laser imaging apparatus use development coating as claimed in claim 2 or claim 3, it is characterized in that: described carbon nanotube is many walls carbon nanometer tube or Single Walled Carbon Nanotube, wherein said multi-walled carbon nano-tubes diameter 10-20nm, length 1-5 μ m, specific surface area 40-300m
2/ g; Described diameter of single-wall carbon nano tube is less than 10nm, length 1-5 μ m, specific surface area 350-450m
2/ g.
5. laser imaging apparatus use development coating as claimed in claim 2, is characterized in that: described dispersion agent is at least one in Xylo-Mucine, polyoxyethylene glycol zinc-base phenyl ether or sodium laurylsulfonate; Described wetting agent is the polyether-modified compound of polydimethylsiloxane; Described defoamer is polysiloxane polyether copolymer.
6. the laser imaging apparatus use development coating as described in claim 1 or 2 or 3, it is characterized in that: described film-forming resin adopts aqueous polyurethane emulsion, water-and acrylate emulsion, water-base fluorocarbon emulsion, or one or more in aqueous alkide resin, aqueous polyester resin, aqueous epoxy resins, water-compatible amino resin and above-mentioned modified resin.
7. the laser imaging apparatus use development coating as described in claim 1 or 2 or 3, is characterized in that: described film coalescence aid adopts one or both in alcohols, ester class, alkane ketone, alkoxide, alcohol ethers.
8. the laser imaging apparatus use development coating as described in claim 1 or 2 or 3, it is characterized in that: after described water-based carbon nanotube conducting dielectric paste is mixed by proportioning with described film-forming resin, add described film coalescence aid, adopting pH value conditioning agent to adjust pH value is 8-10, described pH value conditioning agent is trolamine, monoethanolamine, N, one or more in N-dimethylethanolamine.
9. according to the laser imaging apparatus use development coating described in claim 1 or 2 or 3, it is characterized in that: described solidifying agent adopts any one in aziridine crosslinker, epoxy silane compounds, carbodiimide compound, trimeric cyanamide and modified compound thereof, silane coupling agent.
10. laser imaging apparatus developer roll, is characterized in that: have the coating of the laser imaging apparatus use development coating preparation described in claim 1-10 any one, described Surface Resistivity of Coatings is 10
5-10
8Ω/m
2.
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| CN108490750A (en) * | 2018-05-11 | 2018-09-04 | 湖北大学 | A kind of developer roll and preparation method thereof |
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| CN103555175B (en) | 2016-06-01 |
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