CN109752935B - Conductive roller with stable resistance value and preparation method thereof - Google Patents
Conductive roller with stable resistance value and preparation method thereof Download PDFInfo
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- CN109752935B CN109752935B CN201811604328.9A CN201811604328A CN109752935B CN 109752935 B CN109752935 B CN 109752935B CN 201811604328 A CN201811604328 A CN 201811604328A CN 109752935 B CN109752935 B CN 109752935B
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Abstract
The invention relates to a conductive roller with stable resistance value and a preparation method thereof, wherein the conductive roller comprises a core shaft at an inner layer, an elastic layer at a middle layer and a coating at the surface, the elastic layer is formed by mixing a base material and an auxiliary material, the base material comprises ECO and NBR, the auxiliary material comprises an inorganic filler, a vulcanizing agent, an accelerant and a conductive agent, the ECO in the base material accounts for 20-80% of the total weight of the base material, the conductive agent is alkyl trimethyl ammonium perchlorate, and the conductive agent accounts for 1-5% of the sum of the weight of the base material and the auxiliary material. The conductive agent alkyl trimethyl ammonium perchlorate is a stable resistance material, can stabilize the resistance of an elastic layer, and the conductive roller processed and manufactured by the novel formula material has stable conductivity, small environmental dependence and small electrification rise change, can keep good printing image quality under various environmental change conditions, also keeps good printing quality after long-time printing, and is particularly suitable for a charged roller, a developing roller or a transfer roller with high quality requirements.
Description
Technical Field
The invention relates to the technical field of printing and copying, in particular to a conductive roller with stable resistance value and a preparation method thereof.
Background
A semiconductive roller, such as a charging roller, a developing roller and a transfer roller, which is a semiconductive elongated roller rubber product, is required in printers and copiers, and generally consists of a mandrel (the mandrel is generally a metal shaft) and an elastic layer, which is required to be surface-treated, generally by dip coating or spray coating. The semiconductive roller is one of several large core components which determine the quality of printing, and the quality of the elastic layer directly affects the quality of printing quality. The materials selected for making the elastic layer are largely divided into two categories based on their conductive properties: firstly, the main material is non-conductive, such as EPDM and silica gel, the conductivity is realized by adding an electronic conductive material, the defects are that the material is difficult to be uniformly mixed, the resistance is difficult to be stabilized in a narrow range, the uniformity of the product resistance is also seriously influenced, the printing quality is realized based on the uniform resistance condition, and thus, the printing quality is difficult to be ensured due to the non-uniformity; secondly, the main material has certain conductivity, such as ECO and NBR, the conductivity of the main material is based on ion conductivity, and the main material has the advantages that the resistance value can be very accurate and uniform, but the resistance value is greatly changed under the influence of the environment due to the restriction of the ion conductivity, and the continuous printing quality and the image quality under different environments are difficult to ensure.
The Chinese patent application with the application number of 201610103179.2 and the name of 'conductive roller and preparation method thereof' discloses a material formula of the conductive roller, which comprises a base material and an auxiliary material, wherein the base material comprises NBR and ECO, and the proportion range is 40: 60-75: the auxiliary materials generally include inorganic fillers, vulcanizing agents, accelerators and conductive agents, and specifically may be stearic acid, zinc oxide, carbon black, BHT (antioxidant) and the like. The material has accurate and adjustable electrical property, can meet the requirements of various machine types, but has obvious defects of poor environmental dependence of resistance value, large fluctuation of the resistance value along with the change of temperature and humidity, large change of resistance when electrified for a long time (generally called as large electrified rise magnification), and difficult maintenance of the long-time printing quality requirement and printing of good pictures in various environments. If the resistance stability of the material is further improved on the basis of the material, and the resistance of the material is changed slightly or stabilized within a certain range under the environmental change, the printing quality effect of the material can be ensured to be good, and meanwhile, the continuous printing quality of the product can be achieved, so that the improvement space is still left.
Disclosure of Invention
The invention aims to provide a conductive roller with small environmental dependence, small change of electrification rise and stable resistance value and a preparation method thereof, which can keep good printing image quality under various environmental change conditions and keep good printing quality after long-time printing.
The technical scheme provided by the invention is as follows: the conductive roller with stable resistance value comprises a core shaft at an inner layer, an elastic layer at a middle layer and a coating on the surface, wherein the elastic layer is formed by mixing a base material and an auxiliary material, the base material comprises ECO and NBR, the auxiliary material comprises an inorganic filler, a vulcanizing agent, an accelerant and a conductive agent, the ECO in the base material accounts for 20-80% of the total weight of the base material, the conductive agent is alkyl trimethyl ammonium perchlorate, and the conductive agent accounts for 1-5% of the sum of the weight of the base material and the auxiliary material.
Wherein the coating is a polyurethane coating.
Wherein the surface roughness of the conductive roller is Ra0.4-1 μm.
The other technical scheme provided by the invention is as follows: the preparation method of the conductive roller comprises the following steps: mixing the raw materials according to the formula requirement → cleaning the mandrel, coating adhesive on the surface of the mandrel and drying → extruding the raw materials, inserting the mandrel → wrapping cloth → rolling → vulcanizing → removing the wrapping cloth → coarse grinding → secondary vulcanizing → cutting both ends → fine grinding → cleaning → surface dip coating or spray coating → thermosetting.
The invention has the beneficial effects that: the base material of the elastic layer material is the mixture of ECO and NBR in the prior art, and on the basis, a conductive agent with a specific proportion is particularly added to optimize and improve the formula, the conductive agent is alkyl trimethyl ammonium perchlorate, the conductive agent is a stable resistance material and can stabilize the resistance of the elastic layer, and the conductive roller processed and manufactured by the material with the new formula has stable conductivity, small environmental dependence and small power-on rising change, can keep good printing image quality under various environmental change conditions, and also keeps good printing quality after long-time printing. The conductive roller is particularly suitable for use as a charging roller, a developing roller or a transfer roller of copiers and printers requiring high quality.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a conductive roller of the present invention with stable resistance values;
FIG. 2 is a graph of the rise in current applied to a product obtained in accordance with the first embodiment of the formulation of the elastomeric material of the present invention.
Wherein, 1, a mandrel; 2. an elastic layer; 3. and (4) coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As an embodiment of the conductive roller with stable resistance value, as shown in fig. 1, the conductive roller comprises an inner core shaft 1, an intermediate elastic layer 2 and a surface coating layer 3, wherein the elastic layer 2 is formed by mixing a base material and an auxiliary material, the base material comprises ECO and NBR, the auxiliary material comprises an inorganic filler, a vulcanizing agent, an accelerant and a conductive agent, the ECO in the base material accounts for 20-80% of the total weight of the base material, the conductive agent is alkyl trimethyl ammonium perchlorate, and the conductive agent accounts for 1-5% of the total weight of the base material and the auxiliary material.
The base material of the elastic layer material is the mixture of ECO and NBR in the prior art, and on the basis, a conductive agent with a specific proportion is particularly added to optimize and improve the formula, the conductive agent is alkyl trimethyl ammonium perchlorate, the conductive agent is a stable resistance material and can stabilize the resistance of the elastic layer, and the conductive roller processed and manufactured by the material with the new formula has stable conductivity, small environmental dependence and small power-on rising change, can keep good printing image quality under various environmental change conditions, and also keeps good printing quality after long-time printing. The conductive roller is particularly suitable for use as a charging roller, a developing roller or a transfer roller of copiers and printers requiring high quality.
The above-mentioned resistance stability means stable resistance environment dependency and stability of rise of energization, which are required for satisfactory printing by a charging roller, a transfer roller and a developing roller of a printer or a copying machine.
The proportion of ECO and NBR in the substrate can also be more extensive due to the addition of the conductive agent, and need not be limited to 40: 60 to 75: 25 as in the related patents in the background art.
In this embodiment, the coating 3 is a polyurethane coating, and may be coated on the surface of the elastomer by dip coating or spray coating.
In this embodiment, the surface roughness of the conductive roller is Ra0.4 μm to 1 μm.
The inorganic filler, vulcanizing agent, accelerator and the like in the auxiliary materials belong to the prior art, and the auxiliary materials are many in selection, large in component ratio adjustment range, many in brands and different from each other, so that a clear proportioning range is not given in the application. One skilled in the art can select suitable components and proportions according to the examples and guidance in the chinese invention patent application entitled "conductive roller and method of making the same" having application number 201610103179.2.
The embodiment of the method for preparing the conductive roller with stable resistance value comprises the following steps: mixing the raw materials according to the formula requirement → cleaning the mandrel, coating adhesive on the surface of the mandrel and drying → extruding the raw materials, inserting the mandrel → wrapping cloth → rolling → vulcanizing → removing the wrapping cloth → coarse grinding → secondary vulcanizing → cutting both ends → fine grinding → cleaning → surface dip coating or spray coating → thermosetting.
The first formula scheme of the elastomer material is as follows: 50 parts of ECO, 50 parts of NBR, 5 parts of zinc oxide, 1 part of stearic acid, 2.5 parts of alkyl trimethyl ammonium perchlorate, 15 parts of reinforcing agent, 20 parts of inorganic filler, 1.5 parts of vulcanizing agent, 1.8 parts of accelerator A and 1.2 parts of accelerator B. And obtaining the corresponding conductive roller according to the preparation method of the conductive roller. The product was subjected to a correlation test to obtain the following power-on rise table and fig. 2.
Rise-on-current test
The test conditions are as follows: NL environment (23 ℃ 15%), constant current 37u A, rotational speed: 120rpm, load: sheet side 4.9N.
In the prior art, the electrified rising difference value of a common conductive roller product is more than 0.35log omega ohm, and as can be seen from the table and a figure 2, the electrified rising difference value of the product obtained by the scheme of the invention is within 0.3log omega.
The second formula of the elastomer material of the invention is as follows: 30 parts of ECO, 70 parts of NBR, 5 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of alkyl trimethyl ammonium perchlorate, 15 parts of reinforcing agent, 20 parts of inorganic filler, 1.2 parts of vulcanizing agent, 2.0 parts of accelerator A and 1.2 parts of accelerator B. And obtaining the corresponding conductive roller according to the preparation method of the conductive roller. The product is subjected to relevant tests to obtain the following resistance environment dependence resistance table.
Resistance environmental dependency
The measurement conditions were as follows: voltage application: load of 1000V: 9.8N, rotation speed: 30rpm
The resistance change of the common product with the resistance environment dependency in the prior art is more than 1.7log omega, and the table shows that the resistance change of the product with the resistance environment dependency obtained by the scheme is within 0.9log omega.
The third formula of the elastomer material is as follows: 20 parts of ECO, 80 parts of NBR, 5 parts of zinc oxide, 1 part of stearic acid, 1 part of alkyl trimethyl ammonium perchlorate, 15 parts of reinforcing agent, 20 parts of inorganic filler, 1.2 parts of vulcanizing agent, 2.0 parts of accelerator A and 1.2 parts of accelerator B, which are all parts by weight. And obtaining the corresponding conductive roller according to the preparation method of the conductive roller. The product is subjected to relevant tests to obtain the following resistance environment dependence resistance table.
Resistance environmental dependency
The measurement conditions were as follows: voltage application: load of 1000V: 9.8N, rotation speed: 30rpm
As can be seen from the table, the resistance environment-dependent resistance change of the product obtained by the scheme is within 1.0log omega.
The fourth formula of the elastomer material provided by the invention is as follows: 80 parts of ECO, 20 parts of NBR, 5 parts of zinc oxide, 1 part of stearic acid, 5 parts of alkyl trimethyl ammonium perchlorate, 15 parts of reinforcing agent, 20 parts of inorganic filler, 1.2 parts of vulcanizing agent, 2.0 parts of accelerator A and 1.2 parts of accelerator B. And obtaining the corresponding conductive roller according to the preparation method of the conductive roller. The product is subjected to relevant tests to obtain the following resistance environment dependence resistance table.
Resistance environmental dependency
The measurement conditions were as follows: voltage application: load of 1000V: 9.8N, rotation speed: 30rpm
As can be seen from the table, the resistance environment-dependent resistance change of the product obtained by the scheme is within 0.8log omega.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The conductive roller with stable resistance value comprises a core shaft at an inner layer, an elastic layer at a middle layer and a coating on the surface, wherein the elastic layer is formed by mixing a base material and an auxiliary material, the base material comprises ECO and NBR, the auxiliary material comprises an inorganic filler, a vulcanizing agent, an accelerant and a conductive agent, and the conductive roller is characterized in that the ECO in the base material accounts for 20-80% of the total weight of the base material, the conductive agent is alkyl trimethyl ammonium perchlorate, and the conductive agent accounts for 1-5% of the sum of the weight of the base material and the auxiliary material.
2. The conductive roller as set forth in claim 1 wherein said coating is a polyamine ester coating.
3. The conductive roller as claimed in claim 1, wherein the surface roughness of the conductive roller is ra0.4 to 1 μm.
4. A method for producing the conductive roller as claimed in any one of claims 1 to 3, comprising the steps of: mixing the raw materials according to the formula requirement → cleaning the mandrel, coating adhesive on the surface of the mandrel and drying → extruding the raw materials, inserting the mandrel → wrapping cloth → rolling → vulcanizing → removing the wrapping cloth → coarse grinding → secondary vulcanizing → cutting both ends → fine grinding → cleaning → surface dip coating or spray coating → thermosetting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811604328.9A CN109752935B (en) | 2018-12-26 | 2018-12-26 | Conductive roller with stable resistance value and preparation method thereof |
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| CN201811604328.9A CN109752935B (en) | 2018-12-26 | 2018-12-26 | Conductive roller with stable resistance value and preparation method thereof |
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| CN109752935A CN109752935A (en) | 2019-05-14 |
| CN109752935B true CN109752935B (en) | 2021-08-03 |
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| CN111158227A (en) * | 2020-02-17 | 2020-05-15 | 平田橡塑五金制品（深圳）有限公司 | Transfer roller with stable resistance value and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394906A (en) * | 2001-07-09 | 2003-02-05 | 住友橡胶工业株式会社 | Rubber composition for conductive roller and conductive roller |
| CN101866128A (en) * | 2009-04-15 | 2010-10-20 | 东海橡胶工业株式会社 | Charged roller and manufacture method thereof |
| CN104730879A (en) * | 2013-12-19 | 2015-06-24 | 富士施乐株式会社 | Charging member, charging device, process cartridge, image forming apparatus, and method of manufacturing charging member |
| CN105911831A (en) * | 2015-02-25 | 2016-08-31 | 新智德株式会社 | Conductive roller and method for producing the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005189461A (en) * | 2003-12-25 | 2005-07-14 | Ricoh Co Ltd | Belt fixing device, image forming apparatus and toner used in the image forming apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394906A (en) * | 2001-07-09 | 2003-02-05 | 住友橡胶工业株式会社 | Rubber composition for conductive roller and conductive roller |
| CN101866128A (en) * | 2009-04-15 | 2010-10-20 | 东海橡胶工业株式会社 | Charged roller and manufacture method thereof |
| CN104730879A (en) * | 2013-12-19 | 2015-06-24 | 富士施乐株式会社 | Charging member, charging device, process cartridge, image forming apparatus, and method of manufacturing charging member |
| CN105911831A (en) * | 2015-02-25 | 2016-08-31 | 新智德株式会社 | Conductive roller and method for producing the same |
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