Two-component coating composition, fixing roller and preparation method thereof, and printing and copying equipment

Abstract

The present application relates to the field of coating technology, and specifically to a two-component coating composition, a fixing roller and a preparation method thereof, and a printing and copying device. The two-component coating composition of the present application includes a component A and a component B. In parts by weight, the component A includes: 30 to 98 parts of silane, 1 to 10 parts of inorganic non-metallic filler, 1 to 5 parts of a first dispersant, and 20 to 40 parts of a first solvent; in parts by weight, the component B includes: 40 to 65 parts of silicon dioxide, 1 to 30 parts of a filler, 1 to 6 parts of a second dispersant, and 20 to 40 parts of a second solvent; wherein the silane includes one or more of trialkoxysilane and polysiloxane; the mass ratio of the component A to the component B is (1 to 3): 1. The coating composition of the present application can be used as a raw material for preparing a fixing roller coating, which has good wear resistance and thermal conductivity, and has good non-stickiness with toner, and can provide good imaging effects.

Description

Technical Field

[0001] The present application relates to the technical field of coatings, and in particular to a two-component coating composition, a fixing roller and a preparation method thereof, and a printing and copying device. Background Art

[0002] Printing and copying equipment is widely used in modern office and life. Among them, the key component of printing and copying equipment is the fuser roller. The function of the fuser roller is to melt the toner by heating and pressurizing it and firmly fix it on the paper output by the printing and copying equipment, thus forming the final printed or copied document.

[0003] At present, the fixing roller is usually an aluminum hollow tube, and a high-temperature resistant perfluoroalkoxy resin (PFA) or polytetrafluoroethylene (PTFE) chemical coating is coated on its outer surface. Although the chemical coating of perfluoroalkoxy resin or polytetrafluoroethylene has good high-temperature resistance, its tolerance temperature is about 180°C. However, the above chemical coatings contain perfluoro or polyfluoroalkyl substances, which are not easy to degrade and have the problem of environmental pollution. Summary of the invention

[0004] Based on this, the present application provides a two-component coating composition, a fixing roller and a preparation method thereof, and a printing and copying device. The two-component coating composition provided in the present application can be used as a raw material for preparing a fixing roller coating, does not contain perfluoro or polyfluoroalkyl substances, and has good environmental friendliness; and has good wear resistance and thermal conductivity, and has good non-stickiness with toner, thereby providing good imaging effects.

[0005] In a first aspect of the present application, a two-component coating composition is provided, comprising component A and component B.

[0006] In parts by weight, the component A includes: 30 to 98 parts of silane, 1 to 10 parts of inorganic non-metallic filler, 1 to 5 parts of a first dispersant, and 20 to 40 parts of a first solvent;

[0007] In parts by weight, the component B includes: 40 to 65 parts of silicon dioxide, 1 to 30 parts of filler, 1 to 6 parts of a second dispersant, and 20 to 40 parts of a second solvent;

[0008] Wherein, the silane includes one or more of trialkoxysilane and polysiloxane;

[0009] The structure of the trialkoxysilane is: , R1, R2, R3 and R4 are each independently a C1~C6 alkyl group;

[0010] The structure of the polysiloxane is: , R5, R6, R7, R8, R9 and R10 Each is independently a C1~C6 alkyl or a C1~C6 alkoxy group;

[0011] The mass ratio of the component A to the component B is (1-3):1.

[0012] In one embodiment, the component A has one or more of the following characteristics:

[0013] (1) The inorganic non-metallic filler includes one or more of graphene, molybdenum disulfide, silicon nitride, zirconium oxide, talc, silicon carbide, aluminum oxide and barium titanate;

[0014] (2) the first dispersant includes one or more of a polyalkyl ammonium salt copolymer, a long-chain fatty acid type dispersant, and an acrylic acid copolymer dispersant;

[0015] (3) the first solvent includes one or more of ethanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, dipropylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, glycerol and ethylene glycol;

[0016] (4) Component A further comprises 1 to 10 parts of a pigment by weight; the pigment comprises one or more of carbon black, titanium dioxide, pearlescent powder and mica powder.

[0017] In one embodiment, the silicon dioxide is silicon dioxide modified by a silane coupling agent.

[0018] The preparation steps of the silane coupling agent modified silica include:

[0019] The silicon dioxide and the silane coupling agent are mixed in a benzene solvent and stirred for reaction to prepare the silicon dioxide modified by the silane coupling agent.

[0020] In one of the embodiments, the mass ratio of the silicon dioxide to the silane coupling agent is 1:(0.3~0.8).

[0021] In one embodiment, the component B has one or more of the following characteristics:

[0022] (1) The filler includes one or more of graphene, molybdenum disulfide, silicon nitride, zirconium oxide, talc, silicon carbide, aluminum oxide and barium titanate;

[0023] (2) the second dispersant includes one or more of a polyphosphate dispersant and a phosphate dispersant;

[0024] (3) the second solvent includes one or more of ethanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, dipropylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, glycerol and ethylene glycol;

[0025] (4) Component B further comprises 1 to 10 parts by weight of a colorant; the colorant comprises one or more of carbon black, titanium dioxide, pearlescent powder and mica powder.

[0026] In a second aspect of the present application, a fixing roller is provided, comprising an aluminum fixing roller substrate and a coating disposed on the outer peripheral surface of the aluminum fixing roller substrate, wherein the coating is prepared by the two-component coating composition described in any one of the embodiments of the first aspect of the present application.

[0027] In one embodiment, the coating has one or more of the following characteristics:

[0028] (1) The thickness of the coating is 20 μm to 40 μm;

[0029] (2) The hardness of the coating is 3H~9H;

[0030] (3) The coating comprises silane and silicon dioxide.

[0031] The third aspect of the present application provides a method for preparing the fixing roller according to the second aspect of the present application, comprising the following steps:

[0032] Formulating component A in the two-component coating composition according to any one of the embodiments of the first aspect of the present application to prepare component A;

[0033] Prepare the B component by compounding the B component of the two-component coating composition according to any one of the embodiments of the first aspect of the present application;

[0034] The component A and the component B are mixed, and subjected to aging treatment at a temperature of 15° C. to 30° C. and a rotation speed of 60 rpm to 120 rpm to prepare a coating for a fixing roller;

[0035] The fixing roller is prepared by coating the fixing roller coating on the outer peripheral surface of the aluminum fixing roller substrate and curing the coating to form a coating.

[0036] In one embodiment, the curing process parameters include: a curing temperature of 200° C. to 360° C. and a curing time of 10 min to 30 min.

[0037] A fourth aspect of the present application provides a printing and copying device, comprising the fixing roller described in any one of the embodiments of the third aspect of the present application.

[0038] The two-component coating composition provided in this application has at least the following beneficial effects:

[0039] In the two-component coating composition provided by the present application, component A includes silane, inorganic non-metallic filler, first dispersant and first solvent in specific weight proportions, and each component cooperates with each other to effectively ensure the compatibility of component A. In addition, the silane of specific structure is the main component of component A, which can form a highly cross-linked network structure after curing to give the coating good mechanical strength and wear resistance, thereby increasing the service life of the fixing roller. At the same time, Si-O in silane has a higher bond energy, and it can still maintain good stability at high temperatures to ensure that the fixing roller fixes the toner under high temperature working conditions.

[0040] Component B includes specific weight portions of silica, filler, second dispersant and second solvent, wherein silica as the main component of component B can significantly improve the hardness of the coating to reduce the wear and deformation of the coating, maintain the flatness and roughness of the fixing roller surface, and ensure that the toner can be fixed evenly on the paper. Furthermore, the two-component coating composition provided by the present application has good storage stability; and it does not contain perfluoro or polyfluoroalkyl substances, and has good environmental friendliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the working principle of the fixing roller in a printing and copying device;

[0042] Figure 2 This is a schematic diagram of the structure of the fixing roller provided in this application.

[0043] In the figure, 10-fixing roller, 20-pressure roller, 30-paper, 401-unmelted toner, 402-fixed toner, 101-aluminum fixing roller substrate, 102-coating. DETAILED DESCRIPTION

[0044] The following is a further complete and clear description of the two-component coating composition, fixing roller and preparation method thereof, and printing and copying equipment of the present application in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood.

[0045] In the present application, "alkyl" may represent a straight chain, branched chain and / or cyclic alkyl. Phrases containing this term, for example, "C1-C6 alkyl" refers to an alkyl group containing 1 to 6 carbon atoms, each occurrence of which may be independently C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl. Non-limiting examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, isobutyl, 2-ethylbutyl, 3,3-dimethylbutyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, cyclopentyl, 1-methylpentyl, 3-methylpentyl, 4-methyl-2-pentyl, n-hexyl or cyclohexyl.

[0046] In the present application, "alkoxy" refers to a group with -O-alkyl, i.e., an alkyl group as defined above is connected to a parent core structure via an oxygen atom. Phrases containing the term, for example, "C1~C6 alkoxy" refers to an alkyl moiety containing 1 to 6 carbon atoms, each occurrence of which may be independently C1 alkoxy, C4 alkoxy, C5 alkoxy, C6 alkoxy. Suitable examples include, but are not limited to, methoxy (-O-CH3 or -OMe), ethoxy (-O-CH2CH3 or -OEt) and tert-butoxy (-OC(CH3)3 or -OtBu).

[0047] like Figure 1 As shown, the printing and copying device mainly includes a fixing roller 10 and a pressure roller 20 which are arranged opposite to each other, wherein a fixing passage through which a paper 30 passes is formed between the fixing roller 10 and the pressure roller 20. When the printing and copying device starts to work, the fixing roller 10 is heated to the fixing temperature under the action of the heating element, and the pressure roller 20 maintains a certain pressure contact with the fixing roller 10 after being heated. When the paper 30 with toner enters the fixing passage, the paper 30 is sandwiched between the fixing roller 10 and the pressure roller 20. Under the joint action of the fixing roller 10 and the pressure roller 20, the unmelted toner 401 attached to the paper is heated and pressurized, so that the toner particles are quickly melted under the action of high temperature and pressure, and are firmly combined with the paper 30, thereby forming fixed toner 402, and the fixed toner 402 forms clear and lasting text and images.

[0048] In view of the problem that the currently used fusing roller coating of perfluoroalkoxy resin (PFA) or polytetrafluoroethylene (PTFE) is not environmentally friendly, the present application provides the following two-component coating composition.

[0049] In a first aspect of the present application, a two-component coating composition is provided, comprising a component A and a component B.

[0050] In parts by weight, the component A includes: 30 to 98 parts of silane, 1 to 10 parts of inorganic non-metallic filler, 1 to 5 parts of a first dispersant, and 20 to 40 parts of a first solvent.

[0051] In parts by weight, the component B includes: 40 to 65 parts of silicon dioxide, 1 to 30 parts of filler, 1 to 6 parts of a second dispersant, and 20 to 40 parts of a second solvent.

[0052] Wherein, the silane includes one or more of trialkoxysilane and polysiloxane;

[0053] The structure of the trialkoxysilane is: , R1, R2, R3 and R4 are each independently a C1~C6 alkyl.

[0054] Illustratively, R1, R2, R3 and R4 include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl or sec-butyl.

[0055] Wherein, the structure of the polysiloxane is: , R5, R6, R7, R8, R9 and R 10 Each independently is C1~C6 alkyl or C1~C6 alkoxy. It is understandable that in the present application A component, the weight parts of silane can be selected from any value between 30 parts and 98 parts. For example, the weight parts of silane include but are not limited to 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts or 98 parts, or any two of the above points are within the range of endpoint values. The weight parts of inorganic non-metallic filler can be selected from any value between 1 part and 10 parts. For example, the weight parts of inorganic non-metallic filler include but are not limited to 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts. The weight parts of the first dispersant include but are not limited to 1 part, 2 parts, 3 parts, 4 parts or 5 parts, or any two of the above points are within the range of endpoint values. The weight percentage of the first solvent includes, but is not limited to, 20 parts, 25 parts, 30 parts, 35 parts or 40 parts, or a range consisting of any two of the above points as endpoints.

[0056] In the two-component coating composition provided by the present application, component A includes silane, inorganic non-metallic filler, first dispersant and first solvent in specific weight proportions, and each component cooperates with each other to effectively ensure the compatibility of component A. In addition, the silane of specific structure is the main component of component A, which can form a highly cross-linked network structure after curing to give the coating good mechanical strength and wear resistance, thereby increasing the service life of the fixing roller. At the same time, Si-O in silane has a higher bond energy, and it can still maintain good stability at high temperatures to ensure that the fixing roller fixes the toner under high temperature working conditions.

[0057] The weight portions of silicon dioxide in component B include but are not limited to 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or 65 parts, or any two of the above points are used as the range of endpoint values. The weight portions of filler include but are not limited to 1 part, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts or 30 parts, or any two of the above points are used as the range of endpoint values. The weight portions of the second dispersant include but are not limited to 1 part, 2 parts, 3 parts, 4 parts, 5 parts or 6 parts, or any two of the above points are used as the range of endpoint values. The weight portions of the second solvent include but are not limited to 20 parts, 25 parts, 30 parts, 35 parts or 40 parts, or any two of the above points are used as the range of endpoint values.

[0058] Component B includes specific weight portions of silica, filler, a second dispersant and a second solvent, wherein silica, as a major component of component B, can significantly increase the hardness of the coating to reduce wear and deformation of the coating, maintain the flatness and roughness of the surface of the fixing roller, and ensure that the toner can be evenly fixed on the paper.

[0059] Furthermore, the present application has found that the two-component coating mixture provided by the present application has better storage stability than the one-component coating mixture.

[0060] In one example, the inorganic non-metal filler includes one or more of graphene, molybdenum disulfide, silicon nitride, zirconium oxide, talc, silicon carbide, aluminum oxide and barium titanate. The above inorganic non-metal filler has good synergy with silane and can improve the mechanical properties or lubrication properties of component A to extend the service life or improve the fixing efficiency.

[0061] In one example, the first dispersant includes one or more of a polyalkyl ammonium salt copolymer, a long-chain fatty acid type dispersant, and an acrylic copolymer dispersant.

[0062] The first dispersant can increase the compatibility between the various types of component A. At the same time, in the subsequent coating process, it can also reduce the surface tension of the coating, making the coating easier to level during the coating process and reducing the occurrence of surface defects.

[0063] In one example, the first solvent includes one or more of ethanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, dipropylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, glycerol and ethylene glycol.

[0064] In one example, the component A further comprises 1 to 10 parts of pigment by weight.

[0065] Furthermore, the pigment includes one or more of carbon black, titanium dioxide, pearl powder and mica powder.

[0066] For example, the weight proportions of the pigment in component A include, but are not limited to, 1 part, 3 parts, 5 parts, 7 parts, 9 parts or 10 parts.

[0067] In one example, the silica is silica modified by a silane coupling agent.

[0068] The preparation steps of the silane coupling agent modified silica include:

[0069] The silicon dioxide and the silane coupling agent are mixed in a benzene solvent and stirred for reaction to prepare the silicon dioxide modified by the silane coupling agent.

[0070] Wherein, the mass ratio of the silicon dioxide to the silane coupling agent is 1:(0.3~0.8).

[0071] For example, the mass ratio of silicon dioxide to silane coupling agent includes, but is not limited to, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7 or 1:0.8, or a range consisting of any two of the above point values ​​as endpoint values.

[0072] In one example, the silane coupling agent is γ-chloropropyltriethoxysilane.

[0073] In one example, the benzene solvent is toluene.

[0074] In one example, the mass volume ratio of the mixture of the silica and the benzene solvent is (1-2) g: (150-250) mL.

[0075] In one example, the process parameters for stirring the reaction include: a temperature of 70° C. to 90° C. For example, the temperature for stirring the reaction includes, but is not limited to, 70° C., 72° C., 75° C., 78° C., 80° C., 82° C., 85° C., 88° C., or 90° C., or a range formed by any two of the above point values ​​as endpoint values.

[0076] In one example, the process parameters for the stirring reaction include: time is 10h~20h.

[0077] The present application found that the silane coupling agent-modified silica has a better synergistic effect with component A than the unmodified silica, and can effectively increase the service life of the fixing roller.

[0078] In one example, the filler includes one or more of graphene, molybdenum disulfide, silicon nitride, zirconium oxide, talc, silicon carbide, aluminum oxide and barium titanate.

[0079] In one example, the second dispersant includes one or more of a polyphosphate dispersant and a phosphate ester dispersant.

[0080] In one example, the second solvent includes one or more of ethanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, dipropylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, glycerol and ethylene glycol.

[0081] In one example, the component B further includes 1 to 10 parts of a colorant by weight.

[0082] The colorant includes one or more of carbon black, titanium dioxide, pearl powder and mica powder. For example, the weight proportion of the colorant in component B includes but is not limited to 1 part, 3 parts, 5 parts, 7 parts, 9 parts or 10 parts.

[0083] In one example, the mass ratio of the component A to the component B is (1-3): 1. For example, the mass ratio of the component A to the component B includes but is not limited to 1: 1, 1.2: 1, 1.5: 1, 1.8: 1, 2: 1, 2.2: 1, 2.5: 1, 2.8: 1, 3: 1, or a range formed by any two of the above point values ​​as endpoint values.

[0084] A reasonable mass ratio of component A and component B can make the heat resistance of the two work synergistically, ensuring that the coating remains stable in the high-temperature working environment of the fixing roller, while not sacrificing other important properties such as adhesion and wear resistance due to excessive pursuit of heat resistance, thereby optimizing the comprehensive performance of the coating.

[0085] See also Figure 2 In a second aspect of the present application, a fixing roller 10 is provided, comprising an aluminum fixing roller substrate 101 and a coating 102 disposed on the outer peripheral surface of the aluminum fixing roller substrate. The coating is prepared by the two-component coating composition described in any example of the first aspect of the present application.

[0086] In one example, the coating has a thickness of 20 μm to 40 μm.

[0087] The present application found that when the coating thickness of the coating is 20 μm to 40 μm, the durability of the coating of the fixing roller can be ensured, and the paper is not easily scratched. For example, the thickness of the coating includes but is not limited to 20 μm, 22 μm, 25 μm, 27 μm, 29 μm, 30 μm, 32 μm, 35 μm, 38 μm or 40 μm, or a range formed by any two of the above point values ​​as endpoint values.

[0088] During the long-term contact and friction between the fixing roller and paper, toner and other materials, the higher hardness can effectively reduce the wear of the coating, prevent the debris generated by wear from mixing into the toner or adhering to the paper, thereby avoiding affecting the printing quality and ensuring that the printed text and images are clear and complete. In one example, the hardness of the coating is 3H~9H. For example, the hardness of the coating includes but is not limited to 3H, 4H, 5H, 6H, 7H, 8H or 9H, or within the range formed by any two of the above point values ​​as endpoint values.

[0089] In one example, the coating includes silane and silicon dioxide.

[0090] It is understood that the types of silane and silicon dioxide in the coating are the same as those in the two-component coating composition, and will not be described in detail. Further, the mass ratio of silane to silicon dioxide in the coating is (30-98): (40-65). Illustratively, the mass ratio of silane to silicon dioxide in the coating includes but is not limited to 30:40, 30:45, 30:50, 30:55, 30:60, 30:65, 40:40, 40:45, 40:50, 40:55, 40:60, 40:65, 60:40, 60:45, 60:50, 60:55, 60:60, 60:65, 80:40, 80:45, 80:50, 80:55, 80:60, 80:65, 90:40, 90:45, 90:50, 90:55, 90:60 or 90:65, or in the range formed by any two of the above point values ​​as endpoint values.

[0091] The third aspect of the present application provides a method for preparing the fixing roller according to the second aspect of the present application, comprising the following steps:

[0092] S10. Prepare component A by compounding component A in the two-component coating composition described in any example of the first aspect of the present application.

[0093] S20. Prepare component B by compounding component B in the two-component coating composition described in any example of the first aspect of the present application.

[0094] S30, mixing the component A and the component B, and performing an aging treatment at a temperature of 15° C. to 30° C. and a rotation speed of 60 rpm to 120 rpm to prepare a coating for a fixing roller.

[0095] S40, coating the fixing roller coating on the outer peripheral surface of the aluminum fixing roller substrate, and forming a coating after curing to prepare the fixing roller.

[0096] For example, the temperature for the aging treatment includes, but is not limited to, 15°C, 18°C, 20°C, 22°C, 24°C, 26°C, 28°C or 30°C, or any two of the above values ​​as endpoint values. The rotation speed for the aging treatment includes, but is not limited to, 60 rpm, 70 rpm, 80 rpm, 90 rpm, 100 rpm, 110 rpm or 120 rpm, or any two of the above values ​​as endpoint values.

[0097] In one example, the curing process parameters include: a curing temperature of 200°C to 360°C, and a curing time of 10 min to 30 min. For example, the curing temperature includes but is not limited to 200°C, 240°C, 280°C, 320°C, 340°C or 360°C, or a range formed by any two of the above points as endpoint values.

[0098] According to a fourth aspect of the present application, there is provided a printing and copying device, comprising a fixing roller as described in any example of the third aspect of the present application.

[0099] The coating of the fixing roller of the present application includes a silane of a specific structure, which can form a highly cross-linked network structure after curing to give the coating good mechanical strength and wear resistance, thereby increasing the service life of the fixing roller. At the same time, the Si-O in the silane has a high bond energy, which can still maintain good stability at high temperatures to ensure that the fixing roller fixes the toner under high temperature working conditions. In addition, the included silicon dioxide can significantly increase the hardness of the coating to reduce the wear and deformation of the coating, maintain the flatness and roughness of the surface of the fixing roller, and ensure that the toner can be evenly fixed on the paper.

[0100] The following further specific examples are provided to explain the present application in detail. It should also be understood that the following examples are only used to further explain the present application and cannot be understood as limiting the scope of protection of the present application. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present application belong to the scope of protection of the present application. The specific process parameters of the following embodiments are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not necessarily limited to the specific values ​​of the embodiments below.

[0101] Example 1

[0102] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0103] (2) In parts by weight, component B includes: 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant), and 25 parts of ethanol (second solvent).

[0104] Preparation method of fixing roller:

[0105] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0106] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0107] (3) Component A and component B were mixed at a mass ratio of 1:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0108] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0109] Example 2

[0110] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0111] (2) In parts by weight, component B includes: 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant), and 25 parts of ethanol (second solvent).

[0112] Preparation method of fixing roller:

[0113] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0114] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0115] (3) Component A and component B were mixed at a mass ratio of 2:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0116] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0117] Example 3

[0118] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0119] (2) In parts by weight, component B includes: 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant), and 25 parts of ethanol (second solvent).

[0120] Preparation method of fixing roller:

[0121] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0122] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0123] (3) Component A and component B were mixed at a mass ratio of 3:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0124] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0125] Example 4

[0126] Silane coupling agent modified silica:

[0127] 5 g of silica and 2.5 g of a silane coupling agent (γ-chloropropyltriethoxysilane) were mixed in 100 mL of toluene, and the mixture was stirred and reacted at 80° C. for 12 hours to prepare silane coupling agent-modified silica.

[0128] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0129] (2) In parts by weight, component B includes: 50 parts of silane coupling agent modified silica, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant) and 25 parts of ethanol (second solvent).

[0130] Preparation method of fixing roller:

[0131] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0132] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0133] (3) Component A and component B were mixed at a mass ratio of 1:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0134] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0135] Comparative Example 1

[0136] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0137] (2) In parts by weight, component B includes: 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant), and 25 parts of ethanol (second solvent).

[0138] Preparation method of fixing roller:

[0139] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0140] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0141] (3) Component A and component B were mixed at a mass ratio of 0.5:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0142] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0143] Comparative Example 2

[0144] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0145] (2) In parts by weight, component B includes: 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant), and 25 parts of ethanol (second solvent).

[0146] Preparation method of fixing roller:

[0147] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0148] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0149] (3) Component A and component B were mixed at a mass ratio of 4:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0150] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0151] Comparative Example 3

[0152] Two-component coating composition: (1) Component A comprises, by weight: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), and 27 parts of ethanol (first solvent);

[0153] (2) In parts by weight, component B includes: 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant), and 25 parts of ethanol (second solvent).

[0154] Preparation method of fixing roller:

[0155] (1) Prepare component A by mixing the ingredients according to component A in a two-component coating composition.

[0156] (2) Prepare component B by mixing ingredients according to component B in a two-component coating composition.

[0157] (3) Component A and component B were mixed at a mass ratio of 5:1 and aged at 20° C. and 100 rpm to prepare a coating for a fixing roller.

[0158] (4) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0159] Comparative Example 4

[0160] Comparative Example 4 is substantially the same as Example 1, the main difference being that Comparative Example 4 uses PFA coating of equal thickness.

[0161] Comparative Example 5

[0162] Comparative Example 5 is substantially the same as Example 1, the main difference being that Comparative Example 5 uses PTFE coating of equal thickness.

[0163] Comparative Example 6

[0164] Comparative Example 6 is substantially the same as Example 1, the main difference being that Comparative Example 6 uses PFA / PTEE coatings of equal thickness.

[0165] Comparative Example 7

[0166] Comparative Example 7 is substantially the same as Example 1, the main difference being that Comparative Example 7 uses a single-component coating composition.

[0167] A single-component coating composition comprises: 60 parts of methyltrimethoxysilane, 5 parts of molybdenum disulfide (inorganic non-metallic filler), 3 parts of hexadecyltrimethylammonium bromide (first dispersant), 5 parts of mica powder (pigment), 27 parts of ethanol (first solvent), 50 parts of silicon dioxide, 20 parts of silicon nitride (filler), 5 parts of dodecyl phosphate (second dispersant) and 25 parts of ethanol (second solvent).

[0168] Preparation method of fixing roller:

[0169] (1) The components of the one-component coating composition are formulated to prepare a one-component coating composition.

[0170] (2) The one-component coating composition was aged at a temperature of 20° C. and a rotation speed of 100 rpm to prepare a coating for a fixing roller.

[0171] (3) A coating for a fixing roller is applied to the outer peripheral surface of the aluminum fixing roller substrate, and the coating is cured at 300° C. for 20 minutes to form a coating layer, thereby preparing a fixing roller.

[0172] The test results of the hardness, surface roughness and coating thickness of the fixing roller coating in the above embodiments and comparative examples are shown in Table 1. The hardness of the coating was measured by pencil hardness method; the surface roughness was measured according to GB / T 1031-2009; and the coating thickness was measured according to GB / T 13452.2-2008.

[0173] Table 1

[0174]

[0175] The fixing roller is tested for heat conduction, water drop angle, image properties and service life. The corresponding test conditions include:

[0176] Heat conduction: Heat conduction is measured according to the national standard GB / T32064-2015.

[0177] Water drop angle: The water drop angle is measured using a contact angle meter using the tangent method.

[0178] Image quality: A black and white image was printed using the prepared fixing roller and evaluated. The surface temperature during printing was 180°C. Color unevenness and surface roughness were checked by visual observation. Among them, "◎" means "no color unevenness and rough surface were observed", "○" means "almost no color unevenness and rough surface were observed", "△" means "slight color unevenness and rough surface were observed", and "x" means "severe color unevenness and rough surface were observed".

[0179] Lifespan (number of sheets of paper that are printed until the print quality is unacceptable): Assemble the above-prepared fixing rollers into the printer in sequence and print sheets of paper under given temperature and humidity conditions (temperature 300K, humidity 50±10%RH). Observe the number of prints that appear black / white stripes or spots. If the number of prints is ≥300,000, it is recorded as "OK"; if the number of prints is <300,000, it is recorded as "NG".

[0180] The corresponding test results are shown in Table 2.

[0181] Table 2

[0182]

[0183] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0184] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solution of the present application in detail, but it cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A two-component coating composition, characterized in that: It includes component A and component B. In parts by weight, the component A includes: 30 to 98 parts of silane, 1 to 10 parts of inorganic non-metallic filler, 1 to 5 parts of a first dispersant, and 20 to 40 parts of a first solvent; In parts by weight, the component B includes: 40 to 65 parts of silicon dioxide, 1 to 30 parts of filler, 1 to 6 parts of a second dispersant, and 20 to 40 parts of a second solvent; Wherein, the silane includes one or more of trialkoxysilane and polysiloxane; The structure of the trialkoxysilane is: , R1, R2, R3 and R4 are each independently a C1~C6 alkyl group; The structure of the polysiloxane is: , R5, R6, R7, R8, R9 and R 10 Each is independently a C1~C6 alkyl or a C1~C6 alkoxy group; The mass ratio of the component A to the component B is (1-3):

1.

2. The two-component coating composition according to claim 1, characterized in that: The component A has one or more of the following characteristics: (1) The inorganic non-metallic filler includes one or more of graphene, molybdenum disulfide, silicon nitride, zirconium oxide, talc, silicon carbide, aluminum oxide and barium titanate; (2) the first dispersant includes one or more of a polyalkyl ammonium salt copolymer, a long-chain fatty acid type dispersant, and an acrylic acid copolymer dispersant; (3) the first solvent includes one or more of ethanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, dipropylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, glycerol and ethylene glycol; (4) Component A further comprises 1 to 10 parts of a pigment by weight; the pigment comprises one or more of carbon black, titanium dioxide, pearlescent powder and mica powder.

3. The two-component coating composition according to claim 1, characterized in that: The silicon dioxide is silicon dioxide modified by a silane coupling agent. The preparation steps of the silane coupling agent modified silica include: The silicon dioxide and the silane coupling agent are mixed in a benzene solvent and stirred for reaction to prepare the silicon dioxide modified by the silane coupling agent.

4. The two-component coating composition according to claim 3, characterized in that: The mass ratio of the silicon dioxide to the silane coupling agent is 1:(0.3-0.8).

5. The two-component coating composition according to any one of claims 1 to 4, characterized in that: The B component has one or more of the following characteristics: (1) The filler includes one or more of graphene, molybdenum disulfide, silicon nitride, zirconium oxide, talc, silicon carbide, aluminum oxide and barium titanate; (2) the second dispersant includes one or more of a polyphosphate dispersant and a phosphate dispersant; (3) the second solvent includes one or more of ethanol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, dipropylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, glycerol and ethylene glycol; (4) Component B further comprises 1 to 10 parts by weight of a colorant; the colorant comprises one or more of carbon black, titanium dioxide, pearlescent powder and mica powder.

6. A fixing roller, characterized in that: The invention comprises an aluminum fixing roller substrate and a coating arranged on the outer peripheral surface of the aluminum fixing roller substrate, wherein the coating is prepared by the two-component coating composition according to any one of claims 1 to 5.

7. The fixing roller according to claim 6, characterized in that: The coating has one or more of the following characteristics: (1) The thickness of the coating is 20 μm to 40 μm; (2) The hardness of the coating is 3H~9H; (3) The coating comprises silane and silicon dioxide.

8. A method for preparing a fixing roller according to claim 6 or 7, characterized in that: The following steps are involved: Prepare the component A by compounding the component A in the two-component coating composition according to any one of claims 1 to 5; Prepare the B component by compounding the B component in the two-component coating composition according to any one of claims 1 to 5; The component A and the component B are mixed, and subjected to aging treatment at a temperature of 15° C. to 30° C. and a rotation speed of 60 rpm to 120 rpm to prepare a coating for a fixing roller; The fixing roller is prepared by coating the fixing roller coating on the outer peripheral surface of the aluminum fixing roller substrate and curing the coating to form a coating.

9. The method for preparing a fixing roller according to claim 8, characterized in that: The curing process parameters include: curing temperature of 200° C. to 360° C., and curing time of 10 min to 30 min.

10. A printing and copying device, characterized in that: The fixing roller according to claim 6 or 7 is included.

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