CN102736501A - Cleaning scraper for image forming apparatus - Google Patents
Cleaning scraper for image forming apparatus Download PDFInfo
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- CN102736501A CN102736501A CN2012100774342A CN201210077434A CN102736501A CN 102736501 A CN102736501 A CN 102736501A CN 2012100774342 A CN2012100774342 A CN 2012100774342A CN 201210077434 A CN201210077434 A CN 201210077434A CN 102736501 A CN102736501 A CN 102736501A
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Abstract
The invention provides a cleaning scraper for an image forming apparatus. The cleaning scraper is advantageous in that, under the condition that polymerization toner is used, wear resistance and cleaness in the lower temperature environment are excellent, reduction of line pressure in contact with a photoreceptor caused by thermal cycle can be improved. The cleaning scraper is provided with a two-layer structure of a cutting edge layer and a base material layer, wherein the cutting edge layer uses at least one bifunctional polyester polyol selected from polycaprolactone polyol, polyethylene glycol adipate, and polytetramethylene glycol adipate, and with the average molecular weight of 1500-3500 as a polyol compound, uses 1, 4-butanediol as a chain extender, and uses trimethylolpropane as a crosslinker, the molecular weight among the crosslinking points of the cutting edge layer is 2000<=Mc<=4500; the base material layer uses a bifunctional polycaprolactone polyol with the average molecular weight of 1500-3500 as a polyol compound, uses 1, 4-butanediol as a chain extender, and uses a trimethylolpropane as a crosslinker, 8000<=Mc<=15000.
Description
Technical field
The present invention relates to a kind ofly in electrostatic means image processing systems such as plain paper copier, plain paper facsimile, laser printer, remove the cleaning doctor of the remaining ink powder of photosensitive surface.
Background technology
As the elastic body scraper that in image processing system, uses, use the cleaning doctor of polyurethane elastomer usually.In recent years; In order to form images with high image quality; Used the little pearl polymerization ink powder of particle diameter, under the situation of using this coccode footpath ink powder, with the mar proof that improves scraper, guarantee that spatter property is that the cleaning doctor of purpose is known technology (patent documentation 1～3 etc.).
In patent documentation 1,2; Its objective is provide a kind of under the situation of having used coccode footpath ink powder the cleaning doctor of excellent in wear resistance; It discloses a kind of individual layer cleaning doctor, and this individual layer cleaning doctor is made up of the polyurethane that with molecular-weight adjusting between crosslinking points is particular range.In addition; A kind of double-deck cleaning doctor is disclosed in the patent documentation 3; This double-deck cleaning doctor is to guarantee that spatter property is purpose under the situation of using coccode footpath ink powder; Its disclosed cleaning doctor is made up of polyurethane elastomer, and the polyurethane of the formation cutting edge layer of said polyurethane elastomer has hardness, the rebound resilience of particular range.
Patent documentation 1: Japanese Patent Laid is opened the 2005-345637 communique
Patent documentation 2: Japanese Patent Laid is opened the 2001-345651 communique
Patent documentation 3:WO2008/078461 communique
Summary of the invention
But; Like also record in the patent documentation 3, the individual layer cleaning doctor, less like molecular weight between patent documentation 1,2 disclosed crosslinking points; Therefore rebound resilience is high, and this cleaning doctor can not fully adapt to the requirement of the further raising mar proof that proposes along with the product long-life of being pursued in recent years.In addition; Patent documentation 3 disclosed cleaning doctors; Molecular weight is big between the crosslinking points of the polyurethane of its formation cutting edge layer; Have the leeway improve mar proof, and exist improve by thermal cycle (hot and humid condition with low temperature and low humidity condition repeatedly) cause contact with photoreceptor the time the leeway of linear pressure reduction.
In view of above-mentioned prior art problems; The object of the present invention is to provide a kind of cleaning doctor; Said cleaning doctor is using under the situation of polymeric toner, and mar proof and the spatter property in low temperature environment are excellent, and the linear pressure reduction can improve contacting with photoreceptor of being caused by thermal cycle the time.
Cleaning doctor of the present invention have by cutting edge is touched the cutting edge layer that cleans on the photoreceptor and with the said cutting edge double-decker that constitutes of the base material layer of consolidation layer by layer;
Constitute the polyurethane of said cutting edge layer; Its use at least a be selected from polycaprolactone polyol, polyethyleneglycol adipate, the polytetramethylene glycol adipate, mean molecular weight (end-group analysis method) is that 1500～3500 difunctionality polyester polyol is as polyol compound; Use 1; The 4-butylene glycol uses trimethylolpropane as crosslinking chemical as chain extender, and diisocyanate cpd is '-diphenylmethane diisocyanate (MDI); This polyurethane utilize that molecular weight Mc is 2000≤Mc≤4500 between the crosslinking points that formula 1 calculates;
Constitute the polyurethane of said base material layer; Its use mean molecular weight (end-group analysis method) be 1500～3500 difunctionality polycaprolactone polyol as polyol compound, use 1,4-butylene glycol (BD) is as chain extender; Use trimethylolpropane (TMP) as crosslinking chemical; Diisocyanate cpd is '-diphenylmethane diisocyanate (MDI), this polyurethane utilize that molecular weight Mc is 8000≤Mc≤15000 between the crosslinking points that formula 1 calculates;
Formula 1:Mc=(polyurethane total amount)/(Wt/Mt)
Mt is the molecular weight of crosslinking chemical; Wt is the use amount of crosslinking chemical.
The cleaning doctor of above-mentioned formation under the situation of using polymeric toner, has excellent mar proof and the spatter property in the low temperature environment, and the linear pressure in the time of improving contacting with photoreceptor of being caused by thermal cycle reduces.
In foregoing invention, it is 400～800 low-molecular-weight difunctionality polyester polyol that the polyurethane that constitutes said cutting edge layer preferably also contains molecular weight, and the content of this polyester polyol is 5～20 weight % of polyol compound total amount.
The cleaning balde of above-mentioned formation under the situation of having used polymeric toner, also has excellent mar proof and the spatter property in the low temperature environment, and the linear pressure in the time of improving contacting with photoreceptor of being caused by thermal cycle reduces.
Description of drawings
After Fig. 1 is the wear-resistant evaluation of expression, the sectional view of the greatest wear degree of depth of cleaning doctor.
Embodiment
Elastic polyurethane system elastic body scraper of the present invention is used for image processing system; As the polyol compound that constitutes this elastic body scraper cutting edge layer, use at least a be selected from polycaprolactone polyol, polyethyleneglycol adipate, the polytetramethylene glycol adipate, mean molecular weight (end-group analysis method) is 1500～3500 difunctionality polyester polyol.In addition, constitute the polyurethane of base material layer, using mean molecular weight (end-group analysis method) is that 1500～3500 difunctionality polycaprolactone polyol is as polyol compound.The mean molecular weight of these polyvalent alcohols all is preferably below 3000.As constituting the polyvalent alcohol that the cutting edge layer constitutes polyurethane, its additional low-molecular-weight difunctionality polyvalent alcohol that uses uses polyester polyol.The molecular weight of low-molecular-weight difunctionality polyvalent alcohol is 400～800, more preferably 500～700.
Realize the chain extender of molecular weight between above-mentioned crosslinking points and the ratio between the crosslinking chemical, in the cutting edge layer, be preferably crosslinking chemical/chain extender=1～4 in weight ratio; In base material layer, be preferably crosslinking chemical/chain extender=0.2～0.4 in weight ratio.
Constitute the hardness of the polyurethane of scraper, double-deck cutting edge layer is 60～65, is preferably more than 60 and less than 65 (Xiao A hardness); Base material layer is 65～75 (Xiao A hardness).In addition, constitute the rebound resilience of the polyurethane of scraper, the cutting edge layer is preferably 10%～35%; Base material layer is preferably 25%～50%.In cleaning doctor of the present invention, the thickness of cutting edge layer is preferably 0.3～1.0mm; The thickness of base material layer is preferably 1.0～2.0mm.
As using above-mentioned polyurethane elastomer raw material to form the method for polyurethane elastomer, cutting edge layer, base material layer all can prepare through prepolymer method or semi-prepolymer method (quasi-prepolymerization).In semi-prepolymer method, preferably adopt following semi-prepolymer method: will constitute the part (polyvalent alcohol P1) and isocyanate prepolymer composition reaction of the polyol compound of prepolymer composition earlier, and process prepolymer (prepolymer preparation section); The polyol compound (polyvalent alcohol P2) that contains low-molecular-weight difunctionality polyvalent alcohol with remaining polyol compound, as required mixes with chain extender, crosslinking chemical, forms glycol composition (glycol composition preparation section); Prepolymer is mixed (mixed processes) with glycol composition, form the former fluid composition of reaction; This reaction stoste composition react is solidified.In the curing reaction of the former fluid composition of reaction, the equivalent proportion of NCO/OH (nco index) is preferably 1.05～1.30.
Above-mentioned semi-prepolymer method with polyvalent alcohol P1 and isocyanate prepolymer composition reaction, is processed prepolymer earlier, and said polyvalent alcohol P1 is the part of polyol compound; Remaining polyol component (polyvalent alcohol P2) mixes with crosslinking chemical and chain extender, forms glycol composition.In the semi-prepolymer method of the present invention, the equivalent proportion of the NCO/OH in the preparation section of prepolymer is preferably 5～12.In addition, the ratio of said polyvalent alcohol P1 and polyvalent alcohol P2 counts 1.5～4.5 with the ratio of polyvalent alcohol P1/ polyvalent alcohol P2, and more preferably 2.0～4.0.
Image processing system is used scraper, for example can prepare through the preparation method with following molding procedure.
1. thin slice (sheet) method of forming
(1) successively two kinds of former fluid compositions of reaction is cast laminarly, its reaction is solidified, form the thin slice blank, this thin slice blank is carried out cutting (cutting operation), form scraper.In the thin slice moulding, use centrifugal casting usually.
(2) be installed to through bonding grade and be used for scraper is installed to the matrix material (accessory etc.) on the image processing system, form scraper component.
2. straight forming method
As required, setting is used for scraper is installed to the matrix material (accessory etc.) on the image processing system in mould, and said mould has the die cavity of blade geometry to be formed; The former fluid composition of cast reaction is shaped to the incorporate doctor unit of scraper or scraper and matrix material in the moulding die cavity.In this case, but the thin mould of used thickness when forming ground floor perhaps uses the regulation mould; Use with the good materials such as silicones of the release property of polyurethane to form and the identical shaped parts of the second layer, be accommodated in the mould moulding ground floor; After the ground floor material cured; Remove the release property parts, the second layer is formed raw material inject this part, moulding.
Embodiment
Polyurethane elastomer preparation of sections example
Embodiment 1～4, comparative example 1,2
Proportioning (numerical value is weight portion) according to " prepolymer " hurdle of table 1 is put down in writing reacts the MDI of diisocyanate cpd and polyol compound through conventional method, forms prepolymer (semi-prepolymer).In addition, press the proportioning of " glycol composition " hurdle record of table 1, polyol compound, crosslinking chemical, chain extender are mixed the preparation glycol composition.This prepolymer is mixed with glycol composition, form the former fluid composition of reaction, utilize centrifugal casting to process the polyurethane elastomer thin slice, carry out the back and solidify and slaking.Moulding is carried out as follows, when initial, is used to constitute the former fluid composition of reaction of base material layer, the thin slice of molding thickness 1.3mm; When flowability disappears, be used to form the former fluid composition of reaction of cutting edge layer, the thin slice of molding thickness 0.5mm obtains the double-deck thin slice of aggregate thickness 1.8mm.
Employed urethane raw is following.
PEA2000: polyethyleneglycol adipate (mean molecular weight 2000; F=2 counts in functional group)
PCL2000: with the polycaprolactone glycol (mean molecular weight 2000 of straight diol as initiating agent; Daicel (Daicel) chemical industry)
PBA2000: polytetramethylene glycol adipate (mean molecular weight 2000; F=2 counts in functional group)
PCL1000: with the polycaprolactone glycol (mean molecular weight 1000 of straight diol as initiating agent; Daicel (Daicel) chemical industry)
PCL4000: with the polycaprolactone glycol (mean molecular weight 4000 of straight diol as initiating agent; Daicel (Daicel) chemical industry)
PCL205: with the polycaprolactone glycol (mean molecular weight 525 of straight diol as initiating agent; Daicel (Daicel) chemical industry)
PBA600: polytetramethylene glycol adipate (mean molecular weight 600)
BD:1,4-butylene glycol (chain extender)
TMP: trimethylolpropane (crosslinking chemical)
MDI:4,4 '-'-diphenylmethane diisocyanate
Estimate
The above-mentioned polyurethane elastomer thin slice of processing is carried out cutting processing, process the cleaning doctor of wide 12.5mm, long 326mm, bond on the accessory of regulation, form cleaning member.This cleaning member is installed on the static printing program mode (PM) full color printing/duplicating compounding machine IPSIO SPC821 [(strain) Ricoh (Ricoh) production] that uses polymeric toner, prints certain test pattern, carry out the mar proof evaluation.
The mar proof evaluation be the N/N environment (23 ℃, 54%RH) down continuously form 20000 images after, (10 ℃ of L/L environment; 20%RH) behind 20000 images of continuous down formation; Pull down cleaning doctor, estimate cutting edge portion, obtain the greatest wear degree of depth (μ m) through following method.The result is shown in the latter half of table 1.Low temperature clean property is to be utilized in the image behind 20000 images of continuous formation under the L/L environment, carries out visual assessment.The evaluation result of low temperature clean property, that good is " zero ", is not can not practicability but being of poor performance " △ " since bad and can not practicability be " * ".
(mensuration of wearing and tearing sectional area, the greatest wear degree of depth)
With the cleaning doctor after the above-mentioned evaluation, block along cross direction in the position, 3 place of two ends and central portion, make it possible to see the cross section of the contact site that contacts with photoreceptor, observe the cross section with digital microscope VHX100 (production of Keyemce (Keyence) company).The greatest wear degree of depth is the Y (μ m) of Fig. 1.T is the integral thickness of cleaning doctor, and table 1 result is three maximal values in the measured value.
(hardness, rebound resilience)
Hardness is according to JIS K 6253, the Xiao A hardness under use sclerometer (durometer) is measured 23 ℃, and rebound resilience is according to JIS K 6255 (Lupke formula), under 23 ℃, measures.Mensuration is carried out to the samples of the polyurethane elastomer thin slice of the thickness 1.8mm that obtains in superimposed six preparation examples.
(thermal cycle test)
The polyurethane elastomer thin slice of being processed by embodiment 1 is cut into the sample of thin-and-long, adds the 50mm graticule, is placed in the elongation anchor clamps elongation 50%.Under this state, through becoming 30 ℃, the state (HH) of 80%RH in 2 hours, kept 12 hours from normal temperature environment; Through becoming 10 ℃, the state (LL) of 15%RH in 2 hours, kept 8 hours then.Then, through becoming 30 ℃, the state of 80%RH in 2 hours.This HH-LL circulates and carried out 1 time in per 24 hours, carry out 3 this HH-LL circulations repeatedly after, normal temperature environment held 24 hours, from the elongation anchor clamps, discharge sample, measure the permanent elongation after 4 hours.
Evaluation result
Can find out from the result of table 1, the cleaning doctor of embodiment 1～4, its greatest wear degree of depth is little, and therefore excellent in wear resistance under the situation of using polymeric toner can the distinct image of long term maintenance.In addition, even have the also excellent performance of spatter property under low temperature environment.Different therewith, the cleaning doctor of comparative example 1 is equivalent to the embodiment of patent documentation 1, and its mar proof, low temperature clean property two aspects are all poor than cleaning doctor of the present invention.In addition, under the situation of using polymeric toner, the individual layer cleaning doctor of processing with the polyurethane material of the embodiment of the invention 1 is also having problems aspect mar proof, the low temperature clean property two, and especially low temperature clean property is insufficient.And then the thermal cycle test result of embodiment 1 sample is a permanent elongation 3.3%, and the result is excellent, and the variation of the spatter property that causes of thermal cycle is little repeatedly by low temperature high temperature.
Claims (2)
1. a cleaning doctor is characterized in that, has the cutting edge layer that cleans on the photoreceptor by cutting edge is touched, and with the said cutting edge double-decker that constitutes of the base material layer of consolidation layer by layer;
Constitute the polyurethane of said cutting edge layer; It uses at least a being selected from polycaprolactone polyol, polyethyleneglycol adipate, the polytetramethylene glycol adipate; Mean molecular weight (end-group analysis method) be 1500～3500 difunctionality polyester polyol as polyol compound, use 1, the 4-butylene glycol is as chain extender; Use trimethylolpropane as crosslinking chemical; Diisocyanate cpd is '-diphenylmethane diisocyanate (MDI), this polyurethane utilize that molecular weight Mc is 2000≤Mc≤4500 between the crosslinking points that formula 1 calculates;
Constitute the polyurethane of said base material layer; It uses mean molecular weight (end-group analysis method) is that 1500～3500 difunctionality polycaprolactone polyol is as polyol compound; Use 1, the 4-butylene glycol uses trimethylolpropane as crosslinking chemical as chain extender; Diisocyanate cpd is '-diphenylmethane diisocyanate (MDI), this polyurethane utilize that molecular weight Mc is 8000≤Mc≤15000 between the crosslinking points that formula 1 calculates;
Formula 1:Mc=(polyurethane total amount)/(Wt/Mt)
Mt is the molecular weight of crosslinking chemical; Wt is the use amount of crosslinking chemical.
2. cleaning doctor as claimed in claim 1; It is characterized in that; It is 400～800 low-molecular-weight difunctionality polyester polyol that the polyurethane that constitutes said cutting edge layer also contains molecular weight, and the content of this polyester polyol is 5～20 weight % of polyol compound total amount.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011078224A JP5797439B2 (en) | 2011-03-31 | 2011-03-31 | Cleaning blade for image forming apparatus |
| JP2011-078224 | 2011-03-31 |
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| Publication Number | Publication Date |
|---|---|
| CN102736501A true CN102736501A (en) | 2012-10-17 |
| CN102736501B CN102736501B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210077434.2A Active CN102736501B (en) | 2011-03-31 | 2012-03-22 | Cleaning scraper for image forming apparatus |
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| Country | Link |
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| JP (1) | JP5797439B2 (en) |
| CN (1) | CN102736501B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313408A (en) * | 2016-06-30 | 2019-02-05 | 住友理工株式会社 | Electronic photographing device cleaning blade |
| CN112198775A (en) * | 2020-09-01 | 2021-01-08 | 中山市鼎诚盛新材料有限公司 | Double-layer cleaning scraper film and preparation method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8971764B2 (en) * | 2013-03-29 | 2015-03-03 | Xerox Corporation | Image forming system comprising effective imaging apparatus and toner pairing |
| JP6282162B2 (en) * | 2013-04-30 | 2018-02-21 | キヤノン株式会社 | Manufacturing method of cleaning blade |
| JP6220477B1 (en) * | 2016-01-28 | 2017-10-25 | バンドー化学株式会社 | Manufacturing method of three-dimensional structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005345637A (en) * | 2004-06-01 | 2005-12-15 | Toyo Tire & Rubber Co Ltd | Cleaning blade, method for manufacturing the same and method for cleaning image forming apparatus |
| CN1987680A (en) * | 2005-12-19 | 2007-06-27 | 北辰工业株式会社 | Cleaning blade member |
| CN101617277A (en) * | 2006-12-22 | 2009-12-30 | 阪东化学株式会社 | Cleaning blade for electrophotographic apparatus and manufacture method thereof |
| CN101981078A (en) * | 2008-03-28 | 2011-02-23 | Dic株式会社 | Polyurethane elastomer composition for electrophotographic printing and electrophotographic printing member using the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4779909B2 (en) * | 2006-09-25 | 2011-09-28 | 富士ゼロックス株式会社 | Cleaning blade, cleaning device, process cartridge, and image forming apparatus |
-
2011
- 2011-03-31 JP JP2011078224A patent/JP5797439B2/en active Active
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2012
- 2012-03-22 CN CN201210077434.2A patent/CN102736501B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005345637A (en) * | 2004-06-01 | 2005-12-15 | Toyo Tire & Rubber Co Ltd | Cleaning blade, method for manufacturing the same and method for cleaning image forming apparatus |
| CN1987680A (en) * | 2005-12-19 | 2007-06-27 | 北辰工业株式会社 | Cleaning blade member |
| CN101617277A (en) * | 2006-12-22 | 2009-12-30 | 阪东化学株式会社 | Cleaning blade for electrophotographic apparatus and manufacture method thereof |
| CN101981078A (en) * | 2008-03-28 | 2011-02-23 | Dic株式会社 | Polyurethane elastomer composition for electrophotographic printing and electrophotographic printing member using the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313408A (en) * | 2016-06-30 | 2019-02-05 | 住友理工株式会社 | Electronic photographing device cleaning blade |
| CN109313408B (en) * | 2016-06-30 | 2021-08-27 | 住友理工株式会社 | Cleaning blade for electrophotographic apparatus |
| CN112198775A (en) * | 2020-09-01 | 2021-01-08 | 中山市鼎诚盛新材料有限公司 | Double-layer cleaning scraper film and preparation method thereof |
| CN112198775B (en) * | 2020-09-01 | 2023-03-10 | 中山市鼎诚盛新材料有限公司 | Double-layer cleaning scraper film and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012212059A (en) | 2012-11-01 |
| CN102736501B (en) | 2015-04-22 |
| JP5797439B2 (en) | 2015-10-21 |
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