Protective lubricating coating composition, protective lubricating coating as well as preparation method and protection method of protective lubricating coating

Abstract

The invention provides a protective lubricating coating composition, a protective lubricating coating as well as a preparation method and a protection method of the protective lubricating coating. The protective lubricating coating composition comprises the following components in parts by weight: 20-30 parts of first glass powder, 10-15 parts of second glass powder, 31-51 parts of a lubricating material and 1-5 parts of clay, wherein the lubricating material comprises a solid lubricant, nano metal oxide and fluoride; the solid lubricant is selected from any one or more of molybdenum disulfide, molybdenum disilicide and boron nitride. The protective lubricating coating obtained by mixing the protective lubricating coating composition has good lubricity, heat retaining property and anti-oxidation effect at the high temperature of 350-500 DEG C, so that the protective lubricating coating can be better applied to an alloy forging process.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a protective lubricating coating composition, a protective lubricating coating and a preparation method and a protective method thereof. Background Art

[0002] In the field of metal processing, aluminum alloy and other alloy materials are favored due to their light weight and high strength. Alloy forging is an important manufacturing process that applies external pressure to plastically deform metal materials to obtain specific geometric shapes and sizes. In this process, the use of lubricants is indispensable. Lubricants can reduce the friction between the metal and the die surface and maintain the surface quality of the forging and the integrity of the internal structure.

[0003] At present, the lubricants used in alloy forging processes are mainly vegetable oil, lard and graphite. Although these lubricants can meet the forging needs to a certain extent, their performance in high temperature environments limits the further improvement of forging efficiency and forging quality. Specifically, organic lubricants such as vegetable oil and lard are easily decomposed at high temperatures, producing smoke and harmful gases, which not only affect the operating environment, but also may leave residues on the metal surface, resulting in a decrease in the surface quality of forgings. In addition, the lubricating effect of organic lubricants weakens with increasing temperature, and it cannot effectively reduce the friction at high temperatures, thereby increasing the wear of the mold and reducing its service life. As an inorganic lubricant, although graphite has good high-temperature stability, it has many problems: 1) Low cost but high pollution. Traditional water-based graphite lubricants will produce a large amount of black sewage during use, affecting environmental hygiene and having high treatment costs. 2) Graphite particles are easily deposited on molds, equipment and workshop floors, resulting in increased equipment wear and affecting the cleanliness of the production environment. 3) Graphite is easily affected by high temperatures and burns, reducing the lubrication effect, especially under extreme high temperature conditions, it may not provide continuous and effective lubrication.

[0004] Temperature control is crucial for alloy forging. High temperature not only improves the fluidity of the metal, making it easier to form, but also reduces the energy consumption during the forging process. However, high temperature also accelerates the oxidation process of the metal, forming oxide scale, which not only affects the appearance of the forging, but may also cause internal defects such as cracks and pores. Therefore, it is urgent to develop a coating that can remain stable at high temperatures and has good lubricity, thermal insulation and oxidation resistance, so as to be suitable for alloy forging. Summary of the invention

[0005] The main purpose of the present invention is to provide a protective lubricating coating composition, a protective lubricating coating and a preparation method and a protective method thereof, so as to solve the problems of poor lubricity, poor thermal insulation and poor anti-oxidation performance of the lubricant used in the alloy forging process in the prior art.

[0006] In order to achieve the above object, according to one aspect of the present invention, a protective lubricating coating composition is provided, which comprises, by weight: 20 to 30 parts of a first glass powder, 10 to 15 parts of a second glass powder, 31 to 51 parts of a lubricating material and 1 to 5 parts of clay; wherein, by weight, the first glass powder comprises 20 to 30 parts of SiO 2 15 to 25 portions of B 2 O 3 , 3 to 5 parts of Al 2 O 3 , 25-30 parts of Na 2 O, 5 to 10 parts K 2 O and 3 to 5 parts of CaO; in parts by weight, the second glass powder includes 15 to 25 parts of SiO 2 20 to 30 portions of B 2 O 3 , 5 to 10 parts of Al 2 O 3 , 20-25 parts of Na 2 O, 5 to 10 parts K 2 O and 2 to 5 parts of MgO; the lubricating material includes a solid lubricant, a nano metal oxide and a fluoride; the solid lubricant is selected from any one or more of molybdenum disulfide, molybdenum disilicide and boron nitride.

[0007] Furthermore, the protective lubricating coating composition comprises, by weight: 20 to 28 parts of a first glass powder, 10 to 14 parts of a second glass powder, 34 to 50 parts of a lubricating material and 2 to 5 parts of clay.

[0008] Furthermore, in parts by weight, the solid lubricant is 15 to 20 parts, the nano metal oxide is 10 to 15 parts, and the fluoride is 6 to 16 parts; and / or the nano metal oxide is selected from any one or more of titanium oxide, zirconium oxide and aluminum oxide; and / or the fluoride is calcium fluoride and / or aluminum fluoride.

[0009] Furthermore, the mass ratio of the solid lubricant, the nano metal oxide and the fluoride in the lubricating material is 16-20:11-13:7-10.

[0010] Furthermore, the mass ratio of the first glass powder, the second glass powder and the lubricating material is 20-25:10-13:35-48.

[0011] Further, the protective coating composition further comprises, by weight, 25 to 30 parts of a solvent, 10 to 15 parts of a binder and 1 to 3 parts of an auxiliary agent; wherein the solvent is water; and / or the binder comprises epoxy resin, acrylic resin and polyester resin, and the mass ratio of epoxy resin, acrylic resin and polyester resin is 50 to 60:15 to 25:20 to 30; and / or the auxiliary agent is selected from any one or more of a dispersant, a wetting agent, a defoamer, an organic amine neutralizer, a film-forming aid and a thickener; preferably, the mass proportion of the dispersant in the auxiliary agent is 10 to 20%; and / or the mass proportion of the wetting agent in the auxiliary agent is 5 to 10%; and / or the mass proportion of the defoamer in the auxiliary agent is 5 to 10%; and / or the mass proportion of the organic amine neutralizer in the auxiliary agent is 5 to 10%; and / or the mass proportion of the film-forming aid in the auxiliary agent is 40 to 60%; and / or the mass proportion of the thickener in the auxiliary agent is 5 to 10%.

[0012] According to another aspect of the present invention, there is provided a protective lubricating coating obtained by mixing a protective lubricating coating composition, wherein the protective lubricating coating composition is the protective lubricating coating composition described above.

[0013] According to another aspect of the present invention, a method for preparing the protective lubricating coating is provided, the method comprising: ball milling raw materials corresponding to the protective lubricating coating to obtain the protective lubricating coating.

[0014] According to another aspect of the present invention, a protection method for the above-mentioned protective lubricating coating is provided, and the protection method comprises: coating the protective lubricating coating on the surface of the alloy to obtain a coated alloy; heating the coated alloy to form a protective lubricating coating on the surface of the alloy to obtain a coated alloy; forging the coated alloy, and removing the protective lubricating coating on the surface of the coated alloy after forging; wherein the forging temperature is 350-500°C.

[0015] Furthermore, the alloy is an aluminum alloy; and / or the heating temperature is 350-500° C., and / or the coating thickness of the protective lubricating coating is 0.05-0.25 mm.

[0016] By applying the technical solution of the present invention, the components and contents of the protective lubricating coating composition of the present application are controlled within the above range, and the protective lubricating coating composition of the present application can have good lubricity, heat preservation and anti-oxidation effects at high temperatures of 350 to 500°C, so that the coating on the surface of the alloy can be easily removed without affecting the subsequent treatment of the alloy. Specifically, the softening temperature of the first glass powder is 460 to 510°C, and the softening temperature of the second glass powder is 350 to 400°C. By utilizing the difference in softening temperatures of the first glass powder and the second glass powder, the temperature change of the alloy forging can be better met under the joint action of the two, thereby ensuring that the glass melts at low temperature but does not lose prematurely. At the same time, at the high temperature of the alloy forging, the first glass powder and the second glass powder can form a stable film layer after melting, thereby better protecting the alloy and improving the surface quality of the alloy. The lubricating material having the above components can improve the high temperature resistance and lubrication performance of the coating. Among them, molybdenum disulfide (MoS 2 ) can provide low friction characteristics; MoSi 2 ) is relatively stable at high temperatures and can combine with glass to form a good lubricating film; boron nitride (h-BN) can provide good lubrication properties. Nano metal oxides have excellent wear resistance and oxidation resistance at high temperatures and can be used as reinforcing agents for coatings. Fluorides can lower the melting point of the coating, improve the fluidity and lubricity of the coating, and thus improve the adhesion of the coating. In addition, alloys such as aluminum alloys tend to form adhesions on the surface of the mold. The protective lubricating coating of the present application can effectively prevent the alloy from adhering to the surface of the mold, thereby ensuring the smooth progress of the forging process and thereby improving the efficiency of the forging. The addition of clay can reduce the aggregation between particles, thereby evenly dispersing the solid particles in the liquid medium, thereby preventing the sedimentation of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 An optical photograph showing the surface state of the aluminum alloy after forging in Example 1 of the present application. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] As analyzed in the background technology of this application, the lubricant used in the alloy forging process in the prior art has the problems of poor lubricity, poor thermal insulation and poor anti-oxidation performance. In order to solve the above problems, this application provides a protective lubricating coating composition, a protective lubricating coating and its preparation method, and a protective method.

[0021] In a typical embodiment of the present application, a protective lubricating coating composition is provided, which comprises, by weight, 20 to 30 parts of a first glass powder, 10 to 15 parts of a second glass powder, 31 to 51 parts of a lubricating material, and 1 to 5 parts of clay; wherein, by weight, the first glass powder comprises 20 to 30 parts of SiO 2 15 to 25 portions of B 2 O 3 , 3 to 5 parts of Al 2 O 3 , 25-30 parts of Na 2 O, 5 to 10 parts K 2 O and 3 to 5 parts of CaO; in parts by weight, the second glass powder includes 15 to 25 parts of SiO 2 20 to 30 portions of B 2 O 3 , 5 to 10 parts of Al 2 O 3 , 20-25 parts of Na 2 O, 5 to 10 parts K 2 O and 2 to 5 parts of MgO; the lubricating material includes a solid lubricant, a nano metal oxide and a fluoride; the solid lubricant is selected from molybdenum disulfide (MoS 2 ), MoSi 2 ) and boron nitride (h-BN) or any one or more thereof.

[0022] By controlling the components and contents of the protective lubricating coating composition of the present application within the above range, it can have good lubricity, heat preservation and anti-oxidation effects at high temperatures of 350 to 500°C, so that it can be better applied to alloy forging processes, especially suitable for aluminum alloy forging, and it is easy to remove the coating on the surface of the alloy without affecting the subsequent treatment of the alloy. Specifically, the softening temperature of the first glass powder is 460 to 510°C, and the softening temperature of the second glass powder is 350 to 400°C. By utilizing the difference in softening temperatures of the first glass powder and the second glass powder, the temperature changes of the alloy forging can be better met under the joint action of the two, thereby ensuring that the glass melts at low temperatures but does not lose prematurely. At the same time, under the high temperature of alloy forging, the first glass powder and the second glass powder can form a stable film layer after melting, thereby better protecting the alloy and improving the surface quality of the alloy. The lubricating material having the above components can improve the high temperature resistance and lubrication performance of the coating. Among them, molybdenum disulfide (MoS 2 ) can provide low friction characteristics; MoSi 2 ) is relatively stable at high temperatures and can combine with glass to form a good lubricating film; boron nitride (h-BN) can provide good lubrication properties. Nano metal oxides have excellent wear resistance and oxidation resistance at high temperatures and can be used as reinforcing agents for coatings. Fluorides can lower the melting point of the coating, improve the fluidity and lubricity of the coating, and thus improve the adhesion of the coating. In addition, alloys such as aluminum alloys tend to form adhesions on the surface of the mold. The protective lubricating coating of the present application can effectively prevent the alloy from adhering to the surface of the mold, thereby ensuring the smooth progress of the forging process and thereby improving the efficiency of the forging. The addition of clay can reduce the aggregation between particles, thereby evenly dispersing the solid particles in the liquid medium, thereby preventing the sedimentation of the coating.

[0023] It is preferred that the particle size of the solid components (first glass powder, first glass powder, clay and lubricating material) is 200-400 mesh.

[0024] In order to further improve the lubricity, thermal insulation and anti-oxidation effects of the protective lubricating coating, in one embodiment of the present application, the protective lubricating coating composition comprises, by weight: 20 to 28 parts of a first glass powder, 10 to 14 parts of a second glass powder, 34 to 50 parts of a lubricating material and 2 to 5 parts of clay.

[0025] In order to further improve the lubricity and anti-oxidation performance of the protective lubricating coating, in one embodiment of the present application, the solid lubricant is 15 to 20 parts, the nano metal oxide is 10 to 15 parts, and the fluoride is 6 to 16 parts by weight; and / or the nano metal oxide is selected from titanium oxide (TiO 2 )、ZrO 2 ) and aluminum oxide (Al 2 O3 ) any one or more; and / or, the fluoride is calcium fluoride (CaF 2 ) and / or aluminum fluoride (AlF 3 ).

[0026] In one embodiment of the present application, the mass ratio of the solid lubricant, the nano-metal oxide and the fluoride in the lubricating material is 16-20:11-13:7-10.

[0027] The glass film including glass powder (first glass powder, second glass powder) and solid lubricant forms a double-layer protective structure, which helps to provide a long-term stable lubrication effect at high temperature. Among them, the glass lubricant provides liquid lubrication, and the solid lubricant provides high-temperature self-lubrication. The combination of the two helps to reduce the friction coefficient of the coating, reduce mold wear, and thus extend the life of the mold. The mass ratio of the solid lubricant, nano metal oxide and fluoride in the preferred lubricating material is within the above range, which helps to better lubricate and protect the alloy at high temperature, while better meeting the requirements of high temperature performance, lubrication durability, oxidation resistance and environmental protection.

[0028] In one embodiment of the present application, the mass ratio of the first glass powder, the second glass powder and the lubricating material is 20-25:10-13:35-48.

[0029] It is preferred to control the mass ratio of the first glass powder, the second glass powder and the lubricating material within the above range, which helps to soften the first glass powder and the second glass powder at high temperature and form a molten film, thereby further reducing the friction coefficient between the metal and the mold, and thus reducing mold wear. At the same time, the solid lubricating material provides a stable lubricating effect under high temperature conditions, which helps to further reduce the friction resistance with the first glass powder and the second glass powder, so that the protective lubricating coating has the comprehensive effects of lubrication, heat preservation and anti-oxidation at high temperatures.

[0030] In one embodiment of the present application, the protective coating composition further comprises, by weight, 25 to 30 parts of a solvent, 10 to 15 parts of a binder and 1 to 3 parts of an auxiliary agent; wherein the solvent is water; and / or, and / or, the binder comprises an epoxy resin, an acrylic resin and a polyester resin, and the mass ratio of the epoxy resin, the acrylic resin and the polyester resin is 50 to 60:15 to 25:20 to 30; and / or, the auxiliary agent is selected from a dispersant, a wetting agent, a defoaming agent, an organic amine neutralizer, a film-forming aid and Any one or more of the thickeners; preferably, the mass proportion of the dispersant in the auxiliary agent is 10-20%; and / or, the mass proportion of the wetting agent in the auxiliary agent is 5-10%; and / or, the mass proportion of the defoaming agent in the auxiliary agent is 5-10%; and / or, the mass proportion of the organic amine neutralizer in the auxiliary agent is 5-10%; and / or, the mass proportion of the film-forming auxiliary agent in the auxiliary agent is 40-60%; and / or, the mass proportion of the thickener in the auxiliary agent is 5-10%; the preferred dispersant is the non-ionic dispersant TEGO Dispers 755W, nonionic dispersant Zetasperse 179 and anionic wetting agent AEROSOL OT75, any one or more thereof, preferably the wetting agent is nonionic wetting agent PE-100, preferably the defoaming agent is silicone defoamer HY108 and / or mineral oil defoamer DF691, preferably the organic amine neutralizer is diethanolamine and / or isopropanolamine, preferably the film-forming aid is film-forming aid TEXANOL and / or film-forming aid DALPAD292, and preferably the thickener is polyurethane thickener RM-12W and / or alkali swelling thickener TT-935.

[0031] The type and weight of the preferred solvent are within the above ranges, which helps to disperse the solid components in the coating, thereby improving the uniformity of the coating. The type and mass content of the preferred binder are within the above ranges, which helps to improve the adhesion of the coating to the alloy surface, so that the coating adheres firmly to the metal surface during the forging process. The type and mass content of the preferred additives are within the above ranges, which helps to improve the performance of the coating and optimize its preparation and application process. Specifically, the dispersant helps to disperse the solid particles more evenly in the coating, thereby alleviating particle sedimentation and flocculation, thereby maintaining the stability of the coating. The wetting agent helps to reduce the interfacial tension between the coating and the metal surface, thereby promoting the spreading and wetting of the coating on the alloy surface, forming a more uniform coating. The defoamer helps to reduce the formation of bubbles in the coating during the mixing and application process, thereby reducing defects such as pores in the coating. The organic amine neutralizer helps to adjust the pH value of the coating system, thereby promoting the curing reaction of the binder, thereby enhancing the comprehensive performance of the coating. The film-forming aid helps to form a continuous and uniform film on the alloy surface, thereby improving the film-forming performance of the coating. Thickeners help adjust the viscosity of the paint, which prevents the paint from flowing too quickly during spraying or brushing, and helps control the thickness of the coating.

[0032] In another typical embodiment of the present application, a protective lubricating coating is provided, which is obtained by mixing a protective lubricating coating composition, and the protective lubricating coating composition is the protective lubricating coating composition mentioned above.

[0033] The protective lubricating coating including the protective lubricating coating composition can have good lubricity, heat preservation and anti-oxidation effect at 350-500°C, so that it can be better applied to alloy forging process. In addition, the protective lubricating coating of the present application should be sealed and stored in a cool and dry place. If it is stored for a long time, there will be slight precipitation, which can be used normally after stirring evenly. In addition, the friction coefficient μ of the protective lubricating coating of the present application is 0.1-0.4, the oxidation weight gain is 0.1-0.8% and the thermal conductivity is 0.3-0.8W / m·K.

[0034] In another typical embodiment of the present application, a method for preparing the above-mentioned protective lubricating coating is provided, and the preparation method comprises: ball milling the raw materials corresponding to the protective lubricating coating to obtain the protective lubricating coating.

[0035] Preferably, the first glass powder, the second glass powder, the lubricating material, the clay and the solvent are placed in a ball mill for ball milling to obtain a first mixture; the first mixture is stirred at 500 to 800 r / min using a stirrer while adding additives and a binder in sequence, and after all are added, stirring is performed for 30 minutes to obtain a protective lubricating coating.

[0036] Preferably, the ball-to-material ratio of the ball mill is 3 to 10:1, the rotation speed of the ball mill is 200 to 500 rpm, and the ball milling time is 2 to 12 hours.

[0037] The preparation method of the glass powder is as follows: the above glass powder components are weighed in proportion, mixed and added into a preheated crucible in a muffle furnace for sintering for 30 minutes to obtain a sintered product, and the sintering temperature is 800-1000°C. The sintered product is stirred, placed in a muffle furnace for insulation for 20-30 minutes, and then water quenched. The glass slag obtained by water quenching is placed in an oven at 100°C for drying. The dried glass slag is placed in a ball mill and ball milled for 1-2 hours to obtain glass powder with uniform particle size.

[0038] The protective lubricating coating obtained by the preparation method has good lubricity, heat preservation and anti-oxidation effects, and can be better applied to alloy forging processes.

[0039] In another typical embodiment of the present application, a protective method for lubrication of the above-mentioned protective coating is provided, and the protective method comprises: coating the protective lubricating coating on the surface of the alloy to obtain a coated alloy; heating the coated alloy to form a protective lubricating coating on the surface of the alloy to obtain a coated alloy; forging the coated alloy, and removing the protective lubricating coating on the surface of the coated alloy after forging; wherein the forging temperature is 350 to 500°C.

[0040] Through the above-mentioned protection method, after the protective lubricating coating is stirred evenly and sprayed or brushed onto the surface of the billet alloy before the alloy billet is heated for forging, the protective lubricating coating will dry quickly and have strong adhesion, and the formed coating will be flat and smooth. Therefore, the protective lubricating coating formed on the alloy surface by the protective lubricating coating of the present application can not only maintain effective lubrication effect and stability under the high temperature of forging, but also effectively reduce the friction between the aluminum alloy and the mold, reduce the generation of frictional heat, thereby avoiding mold wear and the generation of aluminum alloy surface defects. At the same time, during forging, the protective lubricating coating extends with the deformation of the forging, which can play a good lubricating and protective role. After forging, the protective lubricating coating can still be tightly attached to the surface of the forging. In addition, aluminum alloy is easy to form adhesion on the surface of the mold, and the protective lubricating coating can effectively prevent the aluminum alloy from adhering to the surface of the mold, thereby ensuring the smooth progress of the forging process.

[0041] The preferred coating method is brushing or spraying. After forging, the alloy can be removed by sandblasting, shot blasting, polishing, pickling and alkali washing.

[0042] In one embodiment of the present application, the alloy is an aluminum alloy; and / or the heating temperature is 350-500° C.; and / or the coating thickness of the protective lubricating coating is 0.05-0.25 mm.

[0043] The coating thickness of the protective coating is preferably within the above range, which helps to form a protective lubricating coating on the surface of the above-mentioned type of alloy under the above-mentioned heating conditions, thereby better lubricating, insulating and anti-oxidizing the alloy during the forging process.

[0044] The preferred alloy is an aluminum alloy, and the aluminum alloy is selected from any one or more of 2XXX (aluminum-copper alloy), 5XXX (aluminum-magnesium alloy), 6XXX (aluminum-magnesium-silicon alloy) and 7XXX (aluminum-zinc-magnesium alloy).

[0045] The beneficial effects of the present application will be further illustrated below in conjunction with embodiments.

[0046] Example 1

[0047] In parts by weight, the raw material composition of the first glass powder is 30 parts of SiO 225 copies of B 2 O 3 , 5 parts of Al 2 O 3 , 25 parts of Na 2 O, 5 parts K 2 O and 3 parts of CaO. The original composition of the second glass powder is 20 parts of SiO 2 30 copies of B 2 O 3 , 5 parts of Al 2 O 3 , 25 parts of Na 2 O, 10 parts K 2 O and 5 parts of MgO. Weigh the raw materials of the first glass powder and the second glass powder respectively according to the proportion, mix them evenly and add them to the preheated crucible in the muffle furnace. The sintering temperature is 900℃. After sintering for 30 minutes, take out and stir. After stirring, continue to keep it in the muffle furnace for 25 minutes and then quench it with water. Put the glass slag obtained by quenching into an oven at 100℃ for drying. Put the dried glass slag into a ball mill and ball mill for 1.5 hours to obtain the first glass powder and the second glass powder with uniform particle size. Among them, the softening temperature of the first glass powder is 480℃, and the softening temperature of the second glass powder is 400℃.

[0048] The raw materials of the protective lubricating coating are as follows: 25 parts of the first glass powder, 13 parts of the second glass powder, 38 parts of the lubricating material, 2 parts of clay, 28 parts of solvent water, 12 parts of the binder and 2 parts of the additive. The lubricating material is composed of 15 parts of the solid lubricant molybdenum disulfide (MoS 2 ), 13 parts of nano metal oxide aluminum oxide (Al 2 O 3 ) and 10 parts of aluminum fluoride (AlF 3 ). In terms of mass percentage, the composition of the binder is 55% epoxy resin, 20% acrylic resin, and 25% polyester resin, and the softening temperature of the second glass powder is 380°C. In terms of mass percentage, the composition of the additive is 14% dispersant TEGO Dispers 755W, 7% wetting agent PE-100, 7% defoaming agent silicone HY108, 7% organic amine neutralizer diethanolamine, 58% film-forming additive TEXANOL, and 7% thickener RM-12W. The particle size of the first glass powder, the second glass powder, the clay, and the lubricating material is 200 mesh.

[0049] The first glass powder, the second glass powder, the lubricating material, the clay and the solvent are put into a ball mill and ball milled to obtain a first mixture; the first mixture is stirred at 650r / min by a stirrer while adding the auxiliary agent and the binder in sequence, and stirred for 30 minutes after all are added to obtain a protective lubricating coating. The ball milling conditions are as follows: the ball-to-material ratio is 5:1, the ball milling speed is 230rpm and the ball milling time is 10h.

[0050] The protective lubricating coating is sprayed on the surface of the 7075 aluminum alloy to obtain the coated alloy. The coated alloy is placed in a furnace at 450°C and heated for 30 minutes to form a protective lubricating coating to obtain a coated alloy. The coated alloy is forged at 450°C after being taken out of the furnace, and air-cooled to room temperature after forging to remove the protective lubricating coating on the surface of the aluminum alloy.

[0051] Example 2

[0052] The difference from Example 1 is that, in terms of weight, the raw materials of the protective lubricating coating are: 20 parts of the first glass powder, 30 parts of the second glass powder, 31 parts of the lubricating material, 1 part of clay, 25 parts of solvent water, 10 parts of the binder and 1 part of the additive, wherein the lubricating material is composed of 15 parts of the solid lubricant molybdenum disulfide (MoS 2 ), 10 parts of nano metal oxide aluminum oxide Al 2 O 3 and 6 parts of aluminum fluoride (AlF 3 ), and finally obtain protective lubricating paint and protective lubricating coating.

[0053] Example 3

[0054] The difference from Example 1 is that, in terms of weight, the raw materials of the protective lubricating coating are: 30 parts of the first glass powder, 20 parts of the second glass powder, 51 parts of the lubricating material, 5 parts of clay, 30 parts of solvent water, 15 parts of the binder and 3 parts of the additive, wherein the lubricating material is composed of 20 parts of the solid lubricant molybdenum disulfide, 15 parts of the nano metal oxide aluminum oxide Al 2 O 3 and 16 parts of aluminum fluoride (AlF 3 ), and finally obtain protective lubricating paint and protective lubricating coating.

[0055] Example 4

[0056] The difference from Example 1 is that the total weight of the lubricating material is 38 parts, the mass ratio of the solid lubricant, the nano metal oxide and to the mass ratio of the fluoride is 20:11:7, and finally a protective lubricating paint and a protective lubricating coating are obtained.

[0057] Example 5

[0058] The difference from Example 1 is that the total weight of the lubricating material is 38 parts, the mass ratio of the solid lubricant, the nano metal oxide and to the mass ratio of the fluoride is 15:10:13, and finally a protective lubricating paint and a protective lubricating coating are obtained.

[0059] Example 6

[0060] The difference from Example 1 is that the total weight of the first glass powder, the second glass powder and the lubricating material is 76 parts, the mass ratio of the first glass powder, the second glass powder and the lubricating material is 20:10:46, and finally a protective lubricating coating and a protective lubricating coating are obtained.

[0061] Example 7

[0062] The difference from Example 1 is that the total weight of the first glass powder, the second glass powder and the lubricating material is 76 parts, the mass ratio of the first glass powder, the second glass powder and the lubricating material is 30:15:31, and finally a protective lubricating coating and a protective lubricating coating are obtained.

[0063] Example 8

[0064] The difference from Example 1 is that the first glass powder is composed of 20 parts of SiO 2 25 copies of B 2 O 3 , 3 parts of Al 2 O 3 , 30 parts of Na 2 O, 5 parts K 2 O and 5 parts of CaO, the softening temperature of the first glass powder is 465°C, and finally a protective lubricating paint and a protective lubricating coating are obtained.

[0065] Example 9

[0066] The difference from Example 1 is that the second glass powder is composed of 15 parts of SiO 2 30 copies of B 2 O 3 , 5 parts of Al 2 O 3 , 25 parts of Na 2 O, 5 parts K 2 O and 2 parts of CaO, the softening temperature of the second glass powder is 365°C, and finally a protective lubricating paint and a protective lubricating coating are obtained.

[0067] Comparative Example 1

[0068] The difference from Example 1 is that the coating is vegetable oil, and a protective lubricating coating is finally obtained.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that, by weight, the raw materials of the protective lubricating coating are: 15 parts of the first glass powder, 35 parts of the second glass powder, 10 parts of the solid lubricant molybdenum disulfide, and 10 parts of the nano metal oxide Al 2 O 3 , 5 parts of fluoride aluminum fluoride, 5 parts of clay, 30 parts of solvent water, 15 parts of binder and 3 parts of additives, and finally obtain a protective lubricating paint and a protective lubricating coating.

[0071] Comparative Example 3

[0072] The difference from Example 1 is that no nano metal oxide Al is added. 2 O 3 , and finally obtain protective lubricating paint and protective lubricating coating.

[0073] Comparative Example 4

[0074] The difference from Example 1 is that the first glass powder is composed of 15 parts of SiO 2 30 copies of B 2 O 3 , 2 parts of Al 2 O 3 , 35 parts of Na 2 O, 3 parts K 2 O and 2 parts of CaO, the softening temperature of the first glass powder is 420°C, and finally a protective lubricating paint and a protective lubricating coating are obtained.

[0075] Comparative Example 5

[0076] The difference from Example 1 is that the second glass powder is composed of 8 parts of SiO 2 35 copies of B 2 O 3 , 3 parts of Al 2 O 3 , 15 parts of Na 2 O, 2 parts K 2 O and 10 parts of CaO, the softening temperature of the second glass powder is 300°C, and finally a protective lubricating paint and a protective lubricating coating are obtained.

[0077] Test method:

[0078] Lubrication performance test: Test the friction coefficient μ according to HB 7065-1994.

[0079] Thermal insulation performance test: Thermal conductivity is tested according to ASTM E1461.

[0080] Anti-oxidation performance test: Test the mass change rate (unit: Δm / m) according to ASTM E1131.

[0081] The protective lubricating coatings of the above embodiments and comparative examples were subjected to performance tests, and the test results are shown in Table 1.

[0082] Table 1

[0083]

[0084] As shown in Table 1, in comparison between Comparative Example 4 and Example 10, the weight fractions of the components in the first glass powder in Comparative Example 4 are not within the range, resulting in a lower softening temperature. Therefore, the protective lubricating coating of Comparative Example 4 cannot play a good lubricating and anti-oxidation role at a high temperature of 450°C. In comparison between Comparative Example 5 and Example 11, the weight fractions of the components in the second glass powder in Comparative Example 5 are not within the range, resulting in a lower softening temperature. Therefore, the protective lubricating coating of Comparative Example 5 cannot play a good lubricating and anti-oxidation role at a high temperature of 450°C.

[0085] The friction coefficient μ of the protective lubricating coatings in the embodiments is ≤0.4, indicating that the lubricating performance of the protective lubricating coatings in the present application is good, while the friction coefficients of the coatings in the comparative examples are all >0.4, indicating that the lubricating performance of the coatings in the comparative examples is poor.

[0086] The thermal conductivity of the embodiments is all <0.5 W / m·K, indicating that the protective lubricating coating of the present application has good thermal insulation performance, while the thermal conductivity of the coating of the comparative example is all >1.0 W / m·K, indicating that its thermal insulation performance is poor.

[0087] The oxidation weight gain of the embodiments is all <1%, indicating that the coating formed by the protective lubricating coating of the present application has excellent anti-oxidation performance, while the oxidation weight gain of the coating of the comparative example is all >5%, indicating that the coating of the comparative example may decompose at high temperature and its protective effect is insufficient.

[0088] in, Figure 1 is an optical photograph of the surface state of the aluminum alloy after forging in Example 1. Figure 1 It can be seen that there are no obvious wrinkles or cracks on the surface of the forged aluminum alloy, and the surface quality is good.

[0089] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0090] By controlling the components and contents of the protective lubricating coating composition of the present application within the above range, it can have good lubricity, heat preservation and anti-oxidation effects at high temperatures of 350 to 500°C, so that it can be better applied to alloy forging processes, especially suitable for aluminum alloy forging, and it is easy to remove the coating on the surface of the alloy without affecting the subsequent treatment of the alloy. Specifically, the softening temperature of the first glass powder is 460 to 510°C, and the softening temperature of the second glass powder is 350 to 400°C. By utilizing the difference in softening temperatures of the first glass powder and the second glass powder, the temperature changes of the alloy forging can be better met under the joint action of the two, thereby ensuring that the glass melts at low temperatures but does not lose prematurely. At the same time, under the high temperature of alloy forging, the first glass powder and the second glass powder can form a stable film layer after melting, thereby better protecting the alloy and improving the surface quality of the alloy. The lubricating material having the above components can improve the high temperature resistance and lubrication performance of the coating. Among them, molybdenum disulfide (MoS 2 ) can provide low friction characteristics; MoSi 2 ) is relatively stable at high temperatures and can combine with glass to form a good lubricating film; boron nitride (h-BN) can provide good lubrication properties. Nano metal oxides have excellent wear resistance and oxidation resistance at high temperatures and can be used as reinforcing agents for coatings. Fluorides can lower the melting point of the coating, improve the fluidity and lubricity of the coating, and thus improve the adhesion of the coating. In addition, alloys such as aluminum alloys tend to form adhesions on the surface of the mold. The protective lubricating coating of the present application can effectively prevent the alloy from adhering to the surface of the mold, thereby ensuring the smooth progress of the forging process and thereby improving the efficiency of the forging. The addition of clay can reduce the aggregation between particles, thereby evenly dispersing the solid particles in the liquid medium, thereby preventing the sedimentation of the coating.

[0091] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A protective lubricating coating composition, characterized in that: The protective lubricating coating composition comprises, by weight: 20 to 30 parts of a first glass powder; 10 to 15 parts of a second glass powder; 31 to 51 parts of lubricating material; and 1-5 parts of clay; Wherein, the first glass powder comprises, by weight, 20 to 30 parts of SiO2, 15 to 25 parts of B2O3, 3 to 5 parts of Al2O3, 25 to 30 parts of Na2O, 5 to 10 parts of K2O and 3 to 5 parts of CaO; In parts by weight, the second glass powder includes 15 to 25 parts of SiO2, 20 to 30 parts of B2O3, 5 to 10 parts of Al2O3, 20 to 25 parts of Na2O, 5 to 10 parts of K2O and 2 to 5 parts of MgO; The lubricating material includes solid lubricant, nano metal oxide and fluoride; The solid lubricant is selected from any one or more of molybdenum disulfide, molybdenum disilicide and boron nitride.

2. The protective lubricating coating composition according to claim 1, characterized in that In parts by weight, the protective lubricating coating composition comprises: 20 to 28 parts of the first glass powder; 10 to 14 parts of the second glass powder; 34 to 50 parts of the lubricating material; and 2 to 5 parts of the clay.

3. The protective lubricating coating composition according to claim 1 or 2, characterized in that: In parts by weight, the solid lubricant is 15 to 20 parts, the nano metal oxide is 10 to 15 parts, and the fluoride is 6 to 16 parts; And / or, the nano metal oxide is selected from any one or more of titanium oxide, zirconium oxide and aluminum oxide; and / or, the fluoride is calcium fluoride and / or aluminum fluoride.

4. The protective lubricating coating composition according to any one of claims 1 to 3, characterized in that The mass ratio of the solid lubricant, the nano metal oxide and the fluoride in the lubricating material is 16-20:11-13:7-10.

5. The protective lubricating coating composition according to any one of claims 1 to 4, characterized in that The mass ratio of the first glass powder, the second glass powder and the lubricating material is 20-25:10-13:35-48.

6. The protective lubricating coating composition according to any one of claims 1 to 5, characterized in that The protective coating composition further comprises, by weight, 25 to 30 parts of a solvent, 10 to 15 parts of a binder and 1 to 3 parts of an auxiliary agent; Wherein, the solvent is water; And / or, the binder comprises epoxy resin, acrylic resin and polyester resin, and the mass ratio of the epoxy resin, the acrylic resin and the polyester resin is 50-60:15-25:20-30; And / or, the auxiliary agent is selected from any one or more of a dispersant, a wetting agent, a defoaming agent, an organic amine neutralizer, a film-forming auxiliary agent and a thickener; preferably, the mass proportion of the dispersant in the auxiliary agent is 10-20%; and / or, the mass proportion of the wetting agent in the auxiliary agent is 5-10%; and / or, the mass proportion of the defoaming agent in the auxiliary agent is 5-10%; and / or, the mass proportion of the organic amine neutralizer in the auxiliary agent is 5-10%; and / or, the mass proportion of the film-forming auxiliary in the auxiliary agent is 40-60%; and / or, the mass proportion of the thickener in the auxiliary agent is 5-10%.

7. A protective lubricating coating obtained by mixing a protective lubricating coating composition, characterized in that: The protective lubricating coating composition is the protective lubricating coating composition according to any one of claims 1 to 6.

8. A method for preparing the protective lubricating coating according to claim 7, characterized in that: The preparation method comprises: The raw materials corresponding to the protective lubricating coating are ball-milled to obtain the protective lubricating coating.

9. A protective method for the protective lubricating coating according to claim 7, characterized in that: The protection method includes: coating the protective lubricating coating on the surface of the alloy to obtain a coated alloy; Heating the coated alloy to form a protective lubricating coating on the surface of the alloy to obtain a coated alloy; Forging the coated alloy, and removing the protective lubricating coating on the surface of the coated alloy after the forging is completed; Wherein, the forging temperature is 350-500°C.

10. The protection method according to claim 9, characterized in that: The alloy is an aluminum alloy; and / or the heating temperature is 350-500° C., and / or the coating thickness of the protective lubricating coating is 0.05-0.25 mm.

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