CN105005184A - Carrier for electrostatic image developer and two-component developer comprising carrier - Google Patents
Carrier for electrostatic image developer and two-component developer comprising carrier Download PDFInfo
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- CN105005184A CN105005184A CN201510422164.8A CN201510422164A CN105005184A CN 105005184 A CN105005184 A CN 105005184A CN 201510422164 A CN201510422164 A CN 201510422164A CN 105005184 A CN105005184 A CN 105005184A
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- electrostatic image
- image developer
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Abstract
The present invention discloses a carrier for an electrostatic image developer and a two-component developer, which solves the problem in the prior art that an existing carrier easily loses efficacy and even causes the agglomeration phenomenon of a developer in extreme high-temperature and high-humidity environments. The carrier comprises a carrier core material and a coating layer coated onto the carrier core material. The above resin coating layer is composed of large-particle-size silica particles. The two-component developer comprises the above carrier for the electrostatic image developer, and a color toner. The carrier is excellent in resistance to extremely high temperature and extremely high humidity. The developer comprising the above carrier is still good in developing performance even when applied in extreme high-temperature and high-humidity environments for a long period of time. Meanwhile, the agglomeration phenomenon of the developer is avoided. According to the technical scheme of the invention, the two-component developer is excellent in developing performance and good in durability. Therefore, the damage to hardware caused by the agglomeration phenomenon of the developer during the printing process in high-temperature and high-humidity environments can be avoided. At the same time, the developer is kept good in developing performance.
Description
Technical field
The present invention relates to a kind of for electrostatic image developing carrier, electrostatic image developing and the electrostatic image development double component developing containing this carrier.
Background technology
Along with the fast development of full-color printing and flying print, and the requirement of people to image fineness, image fiduciary level is more and more higher, and the application of double component developing is more and more extensive.As one of important component in double component developing---carrier, carry transport carbon dust and make the dual-use function of carbon dust frictional electrification, vital effect is played to whole developing process.
Because developing apparatus is often applied to some extreme environment, especially hot and humid environment, thus require very high to the weatherability of developer, and under hot and humid environment, the heat release of developing apparatus due to fuser and the heat release of inner agitating friction, its internal temperature often more taller than room temperature go out many, because carbon dust has the feature of lower glass transition temperatures and low melting point, under this rugged environment, often easily cause carbon dust heat to be melted and be attached to carrier surface, the inefficacy of carrier may be caused, the caking of developer even can be caused under serious conditions, thus damage developing device.
In order to solve this problem, patent CN101211129A proposes in clad, add the titan oxide particles including Detitanium-ore-type crystallization and rutile-type crystallization, but because the hardness of metal oxide particle is higher, long-time wearing and tearing easily cause the outer of carbon dust surface to add the pollution coming off and cause carrier surface, and its use cost is also relatively high.Although there are many research staff to do a lot of work for developer charging stability under raising thermal extremes high humidity environment, be that the work that this extreme environment developer of solution easily lumps but seldom sees report.In addition, due to the low Tg characteristic of chemical carbon powder, under thermal extremes high humidity environment, even if temperature improves 1-2 degree, developer also may be caused to lump, current carrier producer dispatch from the factory before hot and humid test condition be generally 30 DEG C, 80%, and practical service environment is still more common more than 30 DEG C, how keeps the usability of developer at higher temperatures, also there is no similar research before this.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, one is provided to have under thermal extremes high humidity environment (>=30 DEG C, humidity 80%) prevent from carbon dust heat from melting being attached to carrier surface and causing it to lose efficacy, time even seriously, cause the carrier for electrostatic image developer of developer agglomeration problems.
The present invention also provides a kind of double component developing including the electrostatic image development of above-mentioned carrier and toner.
Carrier for electrostatic image developer provided by the invention, comprise carrier core material and be coated on the resin-coating layer in this carrier core material, described resin-coating layer includes Large stone silica dioxide granule.Inventor studies discovery, when preparing the dispersion liquid of clad, the silica dioxide granule of Large stone is added, and then carry out coated on carrier, silicon dioxide can form slight convex in cover surface, this slight convex is attached to carrier surface after can effectively preventing carbon dust heat from melting, thus effectively prevents carbon dust under hot and humid environment from melting the carrier inefficacy and more serious developer caking that cause in the heat of carrier surface.The particle diameter of Large stone silica dioxide granule is preferably 0.1 μm-0.3 μm, if particle diameter is less than 0.1 μm, then cannot cause effective projection at carrier surface, thus can not effectively prevent the thawing of carbon dust heat to be attached to carrier surface, if and particle diameter is greater than 0.3 μm, carrier surface then can be caused too coarse, thus affect flowability of carrier.
Carrier for electrostatic image developer provided by the invention, in its resin-coating layer, the content of silica dioxide granule accounts for the 0.5-2% of clad gross mass, if content is lower than 0.5%, the projection of abundant area then cannot be formed at carrier surface, thus affect result of use, if and content is greater than 2%, then carrier surface can be caused too coarse, thus affect flowability of carrier.
Described silica dioxide granule is for being preferably hydrophobic silica.Under hot and humid environment, silica dioxide granule water suction affects belt carrier electricity, preferably uses hydrophobic silica.
Further, described silica dioxide granule is preferably the silica dioxide granule of positively charged, to prepare the carrier being applicable to electronegativity carbon dust coupling, therefore belt carrier positive electricity, in order to not affect belt carrier electricity, preferably use electropositivity silica dioxide granule.
With carrier core material 100% weighing scale, described clad weight is 1-3% relative to carrier core material, if be less than 1%, carrier is difficult to obtain sufficient permanance on the one hand, also be difficult on the other hand obtain suitable resistance, and be greater than 3%, then carrier resistance can be caused higher.
Carrier for electrostatic image developer provided by the invention, preferably controlling specific insulation is 10
9-10
15Ω cm.If carrier bulk resistivity is less than 10
9Ω cm, because of Reusability to cause in developer toner concentration to reduce time, electric charge may inject carrier, and carrier self may be developed, and when carrier bulk resistivity is greater than 10
15during Ω cm, the such as significantly harmful effect such as edge effect or false contouring may be produced to picture.
Carrier for electrostatic image developer provided by the invention, its volume average particle size D50 is 20 μm-60 μm.When diameter of carrier is too large, impact energy in developing apparatus is corresponding increase also, thus easily cause breaking or fragmentation of carrier, and the charging surface area of toner is diminished, make the charged function reduction of toner, thus cause the detail rendition of developed image to reduce, image clearly cannot be formed.And diameter of carrier too little time, the homogeneity of carrier granular declines, and the magnetic force of single carrier also can decline, and therefore the mutual adhesion between carrier attachment with carrier granular may occur.
Further, containing the carrier of Large stone silica dioxide granule in resin-coating layer, except carbon nanotube particulate in its resin-coating layer, other functional particles can also be comprised, as methacrylate particles, melamine particles etc.These interpolation particles are more conducive to carrier and still have good chargeding performance after long-term use, thus ensure that carrier has good permanance.
Have high permanance and good environmental stability in order to ensure carrier, need to carry out resin bed to the surface of carrier core material coated, its object mainly contains: prevent carbon dust composition from polluting (consumption) to carrier surface; Avoid the fluctuation of carried charge under hot and humid, low temperature and low humidity condition, ensure the high definition image quality under varying environment; The resistance of adjustment developer; Control cincture electricity and carried charge distribution.
The material of resin-coating layer is mainly various macromolecule resin, and the resin of preferred clad comprises at least one in acrylic resin, fluorine-type resin, silicones.Containing the carrier that acrylic resin is coated, due to resin bed difficult drop-off, often there is good permanance, fluorine-type resin and silicones are then because it has lower surface energy, use the carrier of these resin-coating can alleviate the pollution of carbon dust to carrier surface when rubbing with carbon dust, thus extend carrier serviceable life.
In order to improve resistance and the chargeding performance of carrier, can also according to adding various functional particle in clad, as the conductive particle such as carbon black, titania, tin ash, alchlor for adjusting resistance, and for improving the melamine of its chargeding performance, the particles such as acryl resin, above-mentioned functions particle addition can choose reasonable according to actual needs.Because carrier coating thickness is very thin, generally between 0.05-1 μm, the particle diameter adding particle generally need use dispersing apparatus to be dispersed to nanoscale, to guarantee its performance.
The coating equipment of carrier mainly contains fluidized bed, kneader, high-speed mixer etc., and method for coating can select the coated and wet type cladding process of dry type according to whether using solvent, is existing method, is not described further at this.
Beneficial effect:
Large stone hydrophobicity positive electricity silica dioxide granule is introduced in the clad of carrier, effective convex can be formed in carrier cover surface, and effectively can reduce the surface energy of clad resin, use under hot and humid environment, the developer can effectively avoiding carbon dust to cause because heat thawing is attached to carrier surface lost efficacy, the developer caking that may cause time even serious, and the image fineness that obtains under hot and humid environment of this developer is high and reliability is strong.
Embodiment
Embodiment 1
The preparation of carrier core material:
By 720g iron oxide, 230g manganese oxide, 50g magnesium oxide dispersion is in 1000g water, add 5g polyacrylic acid dispersant, use sand mill that this compound is ground to mean grain size 1 microns, add 15g polyvinyl alcohol (PVA) again as bonding agent, use Spray granulation equipment to obtain the pelletizing of 10-80 micron.This granulation part is dropped in electric furnace, use 850 DEG C and carry out presintering, sintering furnace is added in 1000g water after sintering, add 5g polyacrylic acid dispersant, reuse sand mill and this compound is ground to mean grain size 1 microns, add 15g polyvinyl alcohol (PVA) again as bonding agent, use Spray granulation equipment to obtain the pelletizing of 10-80 micron.This granulation part is dropped in electric furnace, uses 1240 DEG C and carry out double sintering.This sintering feed is carried out fragmentation, classification, and screening, obtains the carrier core material of 36 microns.
The preparation of resin dispersion liquid:
40g polymethylmethacrylate-styrene resin (MMA/St=4/1) is dissolved in 360g toluene, be added into 4g carbon black, 0.4g Large stone (particle diameter 0.1 μm) hydrophobicity and the silica dioxide granule of positively charged, use sand mill at grinding at room temperature 10min, obtain the resin dispersion liquid that below mean grain size 300nm contains carbon black and silica dioxide granule.If following examples are without specified otherwise, the silica dioxide granule of use is hydrophobicity and the silica dioxide granule of positively charged.
Carrier coated:
2KG carrier core material is dropped in 2L kneader, open and stir, slowly pour the resin dispersion liquid containing carbon black and silica dioxide granule into, be warming up to 70 degree, after stirring half an hour, vacuumize removing toluene solvant.Pour out carrier, use 200 eye mesh screens to carry out sieving to remove bulky grain, then carry out classification removing granule with gas flow sizing machine, obtain carrier.
Embodiment 2
Except using 0.2g silica dioxide granule, other conditions are with embodiment 1.
Embodiment 3
Except using 0.6g silica dioxide granule, other conditions are with embodiment 1.
Embodiment 4
Except using 0.8g silica dioxide granule, other conditions are with embodiment 1.
Embodiment 5
Except the silica dioxide granule that use particle diameter is 0.2 μm, other conditions are with embodiment 1.
Embodiment 6
Except the silica dioxide granule that use particle diameter is 0.3 μm, other conditions are with embodiment 1.
Comparative example 1
Except not using silica dioxide granule, other conditions are with embodiment 1.
Comparative example 2
Except using 0.1g silica dioxide granule, other conditions are with embodiment 1.
The mensuration of specific insulation
Method of testing normative reference JB/T 9437-1999, test result is in table two.
The laser diffraction granularity distribution instrument of the LS-230 model that volume average particle size uses Beckman Coulter Inc. of the U.S. to produce measures, and the density and the bottom ash that print specimen page then use X-Rite 938 (X-Rite Incorporation manufactures) to test.
Print blocking test:
The carrier of 10 parts of carbon dusts and 90 parts of above-described embodiment 1-6 and comparative example 1-2 is mixed and stirs the developer obtaining embodiment 1-6 and comparative example 1-2, outputting standard test sheets on a printer.Method of testing is: stablize more than 12 hours in hot and humid environment laboratory, then starts test.
First in hot and humid (30 DEG C, 80%) environmental laboratory, carry out printing evaluation test, print 10000 test sheets, observe the situation of developer caking, then the temperature (32 DEG C in hot and humid environment laboratory is improved, 80%), print 10000 test sheets, again observe the situation of developer caking, find in both environments, in embodiment all there is not caking phenomenon in all developers, and by scanning electron microscope analysis and the change printing front and back belt electricity, carbon dust does not almost pollute carrier surface, and comparative example 1 all there occurs developer caking phenomenon in both environments, and although comparative example 2 is at 30 DEG C, developer caking phenomenon is there is not under the environment of 80%, but at 32 DEG C, 80% there occurs comparatively significantly developer caking phenomenon, and by scanning electron microscopic observation at 30 DEG C, the thawing of 80% time existing part carbon dust heat is attached to carrier surface, Component Vectors is caused to lose efficacy.
30 DEG C, table 1, the carried charge tested under 80% environment, prints the density of specimen page and bottom ash data and blocking test data:
As can be seen from the above data, no matter whether add silica dioxide granule, initial strip electricity is all good with the situation of printing, but after printing 10000, interpolation and addition are when below 0.5wt% measures silicon dioxide, carried charge all obviously declines, and density also obviously declines, bottom ash then obviously rises, illustrate that silicon dioxide effectively can not only stop the caking of developer under thermal extremes high humidity environment, also have positive effect to the stability printing specimen page image under maintenance hot and humid environment simultaneously.
The specific insulation of table 2 embodiment and comparative example and volume average particle size data
| Carrier | Specific insulation (Ω cm) | Volume average particle size (μm) |
| Embodiment 1 | 3.2×10 13 | 36.79 |
| Embodiment 2 | 4.5×10 13 | 36.38 |
| Embodiment 3 | 2.8×10 13 | 37.37 |
| Embodiment 4 | 2.3×10 13 | 37.05 |
| Embodiment 5 | 3.7×10 13 | 36.59 |
| Embodiment 6 | 4.8×10 13 | 37.17 |
| Comparative example 1 | 5.1×10 13 | 37.26 |
| Comparative example 2 | 2.9×10 13 | 37.75 |
Claims (10)
1. a carrier for electrostatic image developer, comprises carrier core material and clad thereof, it is characterized in that, is added with the silica dioxide granule that particle diameter is 0.1 μm-0.3 μm in described clad.
2. carrier for electrostatic image developer as claimed in claim 1, it is characterized in that, in described resin-coating layer, the content of silica dioxide granule is 0.5-2%wt.
3. carrier for electrostatic image developer as claimed in claim 1 or 2, it is characterized in that, described silica dioxide granule is hydrophobic silica particles.
4. carrier for electrostatic image developer as claimed in claim 3, it is characterized in that, described silica dioxide granule is the silica dioxide granule of positively charged.
5. carrier for electrostatic image developer as claimed in claim 1 or 2, it is characterized in that, described clad is the 1-3% of carrier core material general assembly (TW).
6. carrier for electrostatic image developer as claimed in claim 1 or 2, is characterized in that, containing at least one in acrylic resin, fluorine-type resin or silicones in described clad.
7. carrier for electrostatic image developer as claimed in claim 1 or 2, is characterized in that, also containing being dispersed to nano level resistance adjustment agent particle in described clad.
8. carrier for electrostatic image developer as claimed in claim 7, it is characterized in that, described resistance adjustment agent is carbon black.
9. the carrier for electrostatic image developer as described in claim 1 or 2 or 7, is characterized in that, the specific insulation of described carrier is 10
9-10
15Ω cm, volume average particle size D50 are 20 μm-60 μm.
10. a double component developing, is characterized in that, containing the carrier for electrostatic image developer described in any one of claim 1-9 and toner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510422164.8A CN105005184B (en) | 2015-07-17 | 2015-07-17 | Carrier for electrostatic image developer and two-component developer containing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510422164.8A CN105005184B (en) | 2015-07-17 | 2015-07-17 | Carrier for electrostatic image developer and two-component developer containing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105005184A true CN105005184A (en) | 2015-10-28 |
| CN105005184B CN105005184B (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510422164.8A Active CN105005184B (en) | 2015-07-17 | 2015-07-17 | Carrier for electrostatic image developer and two-component developer containing the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372958A (en) * | 2015-12-09 | 2016-03-02 | 湖北鼎龙化学股份有限公司 | Resin-coated carrier and preparation method therefor, and bi-component developing agent |
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| JPS59232362A (en) * | 1983-06-15 | 1984-12-27 | Ricoh Co Ltd | Carrier for electrostatic latent image developer |
| US20060121385A1 (en) * | 2004-11-11 | 2006-06-08 | Powdertech Co., Ltd. | Resin-coated ferrite carrier for electrophotographic developer, its production method, and electrophotographic developer using the resin-coated ferrite carrier |
| CN1845010A (en) * | 2005-04-06 | 2006-10-11 | 株式会社理光 | Carrier, developer, developer container, image forming method and processing box |
| CN1920676A (en) * | 2005-08-23 | 2007-02-28 | 富士施乐株式会社 | Electrostatic latent image developer and image-forming apparatus |
| JP2007279657A (en) * | 2005-08-25 | 2007-10-25 | Ricoh Co Ltd | Carrier and developer, and image forming method, image forming apparatus, and process cartridge |
| US20090047594A1 (en) * | 2007-01-12 | 2009-02-19 | Sharp Kabushiki Kaisha | Developer |
-
2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59232362A (en) * | 1983-06-15 | 1984-12-27 | Ricoh Co Ltd | Carrier for electrostatic latent image developer |
| US20060121385A1 (en) * | 2004-11-11 | 2006-06-08 | Powdertech Co., Ltd. | Resin-coated ferrite carrier for electrophotographic developer, its production method, and electrophotographic developer using the resin-coated ferrite carrier |
| CN1845010A (en) * | 2005-04-06 | 2006-10-11 | 株式会社理光 | Carrier, developer, developer container, image forming method and processing box |
| CN1920676A (en) * | 2005-08-23 | 2007-02-28 | 富士施乐株式会社 | Electrostatic latent image developer and image-forming apparatus |
| JP2007279657A (en) * | 2005-08-25 | 2007-10-25 | Ricoh Co Ltd | Carrier and developer, and image forming method, image forming apparatus, and process cartridge |
| US20090047594A1 (en) * | 2007-01-12 | 2009-02-19 | Sharp Kabushiki Kaisha | Developer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372958A (en) * | 2015-12-09 | 2016-03-02 | 湖北鼎龙化学股份有限公司 | Resin-coated carrier and preparation method therefor, and bi-component developing agent |
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| CN105005184B (en) | 2020-07-07 |
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