Water-based lubricating coating for upsetting fastener titanium alloy wire as well as preparation and application of water-based lubricating coating

Abstract

The invention relates to a water-based adhesive solid lubricating coating, in particular to a water-based lubricating coating for upsetting a titanium alloy wire of a fastener, which solves the problem of adhesion between a material and a mold in the upsetting production process of the fastener, and also avoids the problems of material cracking and mold scrapping. The water-based lubricating coating is prepared by taking an inorganic potassium silicate solution as a binder, taking a compound of graphite and molybdenum disulfide as a lubricant, taking a polyoxyethylene ether dispersant as a wetting dispersant, taking an organic silicon defoaming agent as a defoaming agent and taking water as a dispersion medium. The lubricating coating is completely waterborne, and has the characteristics of environment friendliness, high normal-temperature curing speed, simplicity in coating, easiness in removal of a coating and the like. The surface of a wire is coated with the water-based lubricating coating in a dip-coating mode, the obtained lubricating coating can effectively protect the surface of the wire from being abraded in the fastener upsetting process, upsetting cracks of the material are avoided, the service life of an upsetting mold is prolonged, and the continuity and production quality of fastener upsetting production are guaranteed.

Description

Technical Field

[0001] The present invention relates to a water-based bonding solid lubricating coating, in particular to a water-based lubricating coating used for upsetting titanium alloy wires of fasteners. The present invention also relates to the preparation and application of the water-based lubricating coating. Background Art

[0002] Titanium alloy is an important structural material for manufacturing fasteners. Titanium alloy fasteners have a significant weight reduction effect on aircraft and spacecraft. In modern advanced aircraft manufacturing, the number of fasteners used in a large aircraft is as many as hundreds of thousands to millions, of which titanium alloy threaded fasteners account for as much as 90%. Titanium alloy fasteners have become the most important "aerospace fasteners" variety today, which will greatly increase the demand for high-performance titanium alloy fasteners, and have huge economic and application prospects.

[0003] With the increasing demand for titanium alloy fasteners, the production method has also undergone tremendous changes. At present, the production method has gradually changed from the traditional single-piece hot forging production to the fast and efficient continuous cold and warm forging production method, and the production efficiency of the first forging process has been greatly improved from 4-6 pieces / min to 80-120 pieces / min. However, due to the characteristics of titanium alloy materials such as high chemical activity and poor wear resistance, the problem of adhesion between the material and the mold occurs during the fastener forging production process, which makes it difficult to demold the product, affecting the continuity and production quality of the fastener forging production. Moreover, the huge pressure between the fastener material and the mold will also cause the loose oxide layer on the surface of the material to fall off and adhere to the mold surface, causing mold wear and reducing the service life of the mold. In addition, the upsetting processing method used in the production of fasteners is prone to cracking of the material, and even causes the mold to be scrapped in severe cases. Therefore, in order to achieve the smooth upsetting of titanium alloy fasteners, a solid lubricating coating must be applied to the surface of the wire.

[0004] At present, the binders used in most bonded solid lubricating coatings are organic solvent-based, and a large amount of organic solvents are added to the coating components. A large number of organic compounds are toxic and flammable, and they evaporate into the air during the coating preparation process, causing serious harm to the environment and human body. With the enhancement of people's environmental awareness, the restrictions on the content of volatile organic compounds emitted into the atmosphere are becoming more and more stringent. Therefore, it is necessary to use non-polluting or low-polluting coating components as much as possible.

[0005] Water-based solid lubricating coatings with silicate as the bonding component have outstanding advantages such as wide operating temperature range, low vacuum outgassing rate, and good compatibility with liquid oxygen. Moreover, the dispersion medium water has the advantages of low price, no odor, and no volatile organic compounds. In the long run, the research and development of water-based bonded solid lubricating coatings is an important direction for the future development of solid lubricating coatings. It has become an inevitable trend for today's development to replace solvent-based bonded solid lubricating coatings and move towards an environmentally friendly direction. Therefore, water-based bonded solid lubricating coatings are the main direction for the development of lubricating coatings on the surface of titanium alloy wires for fasteners. Summary of the invention

[0006] The purpose of the present invention is to provide a water-based lubricating coating for upsetting titanium alloy wires for fasteners and a preparation method thereof, wherein the lubricating coating is completely water-based and has the advantages of being green and environmentally friendly, fast curing at room temperature, simple coating, and easy removal of the coating. Another purpose of the present invention is to provide a water-based lubricating coating for upsetting titanium alloy wires for fasteners, wherein the lubricating coating can effectively protect the surface of the wire from being worn during the upsetting process of the fasteners, avoid upsetting cracks in the material, extend the service life of the upsetting die, and ensure the continuity and production quality of the upsetting production of the fasteners.

[0007] The invention discloses a water-based lubricating coating for upsetting titanium alloy wire for fasteners, which is prepared by using an inorganic potassium silicate solution as a binder, a composite of graphite and molybdenum disulfide as a lubricant, a polyoxyethylene ether dispersant as a wetting dispersant, an organosilicon defoamer as a defoamer, and water as a dispersion medium.

[0008] The components are prepared according to the following mass percentages: 40-55% (preferably 43-48%) of binder, 30-35% (preferably 32-35%) of lubricant, 2-4% of wetting and dispersing agent, 1-2% of defoaming agent, and the balance of water is added to 100%.

[0009] The proportions of the components of the binder inorganic potassium silicate solution are prepared according to the following mass percentages: 20-35% (preferably 22-27%) of silane coupling agent 570, 10-25% (preferably 12-17%) of high modulus potassium silicate (modulus n≥5), and the balance is water;

[0010] The specific preparation process is: first add the required amount of silane coupling agent 570 into the required amount of water, adjust the pH value with acetic acid to control the pH value at 3.5-4.0, stir and hydrolyze for 6-8 hours, add the required amount of high modulus potassium silicate (modulus n≥5), and continue stirring for 8-10 hours to obtain an inorganic potassium silicate solution.

[0011] The mass ratio of the lubricant graphite to molybdenum disulfide is 1:(2-4), preferably 1:(2.5-3.5), and more preferably 1:(2.8-3.2).

[0012] The industrial-grade graphite particles are micron or submicron-grade, and are composed of agglomerated flake graphite particles, with a particle purity of ≥90%, a particle size of ≤10 μm, and a graphite flake thickness of 100-200 nm.

[0013] The molybdenum disulfide particles are micron or submicron-sized and are agglomerated particles of flaky molybdenum disulfide. The particle purity is ≥98%, the particle size is ≤5μm, and the thickness of the molybdenum disulfide flaky layer is 50-200nm.

[0014] Polyoxyethylene ether dispersants are Nonylphenol polyoxyethylene ether Dispersant or alkylphenol polyoxyethylene ether dispersant.

[0015] The organosilicon defoamer is a polyether-modified organosilicon defoamer or an organo-modified polysiloxane defoamer.

[0016] The preparation method of the above-mentioned water-based lubricating coating comprises the following specific steps:

[0017] (1) firstly hydrolyzing the silane coupling agent 570 with water, and then adding high modulus potassium silicate (modulus n ≥ 5) to obtain an inorganic potassium silicate solution;

[0018] (2) Weighing graphite powder and molybdenum disulfide powder in the required proportion, dispersing them in part or all of the required balance of water with the required amount of wetting and dispersing agent and the required amount of defoaming agent, and ball milling them for 20 to 40 hours;

[0019] (3) The inorganic potassium silicate solution prepared in step (1) and the mixed powder of graphite and molybdenum disulfide ball-milled in step (2) are fully mixed, with no or excess water added, to obtain a water-based lubricating coating for upsetting titanium alloy wire for fasteners.

[0020] Another aspect of the present invention provides a water-based lubricating coating for upsetting titanium alloy wire for fasteners. The lubricating coating is prepared by coating the above-mentioned water-based lubricating coating on the surface of the smooth wire or the surface of the pre-treated wire by dipping. The coated wire can be completely cured at room temperature, and the curing time is 3 to 20 minutes.

[0021] The pre-treatment refers to that the surface of the wire can be subjected to one or more surface treatments such as phosphating, fluorinated boronizing or sandblasting to increase the surface roughness of the wire so that the coating can adhere well.

[0022] Before coating, the surface of the wire to be coated should be cleaned with anhydrous ethanol and / or petroleum ether, and left to dry in the air. The coating can only be carried out after visual inspection to ensure that there is no contaminant attached to the surface of the wire to be coated;

[0023] According to the coating thickness requirement, the water-based lubricating coating does not need to be diluted or can be diluted with water, the amount of water used is not greater than (less than or equal to) 20% of the mass of the water-based lubricating coating, and can be coated after being fully stirred.

[0024] The lubricating coating is completely water-based and has the characteristics of being green and environmentally friendly, fast curing at room temperature, simple coating, and easy removal of the coating. The water-based lubricating coating is applied to the surface of the wire by dipping, and the obtained lubricating coating can effectively protect the surface of the wire from wear during the fastener upsetting process, avoid upsetting cracks in the material, extend the service life of the upsetting die, and ensure the continuity and production quality of the fastener upsetting production.

[0025] The present invention has the following advantages and beneficial effects:

[0026] (1) The lubricating coating of the present invention is completely water-based, green, environmentally friendly, clean and pollution-free.

[0027] (2) The water-based lubricating coating of the present invention can be quickly cured at room temperature with a short curing time, which shortens the coating preparation time and improves work efficiency.

[0028] (3) The water-based lubricating coating of the present invention is simple to apply and easy to operate. The water-based lubricating coating can be applied not only on the surface of the wire after being treated by phosphating, fluorinated boronization, sandblasting, etc., but also directly on the surface of the bare wire.

[0029] (4) The water-based lubricating coating of the present invention is easy to remove by soaking in 20% sodium hydroxide solution at 80°C.

[0030] (5) The water-based lubricating coating of the present invention can effectively reduce the friction between the wire and the die during the upsetting of fasteners, avoid material cracking, extend the life of the die, improve production efficiency, and meet the needs of continuous upsetting production of fasteners. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a real picture of the water-based lubricating coating on the surface of the TC4 coil wire prepared in Example 1.

[0032] Figure 2 is the thickness of the lubricating coating on the surface of the TC4 coil wire in Example 1.

[0033] Figure 3 is the thickness of the lubricating coating on the surface of the TC10 coiled wire in Example 2.

[0034] Figure 4 This is a photo of the fastener after upsetting of the coated TC10 round wire in Example 2. DETAILED DESCRIPTION

[0035] In the specific implementation process, the water-based lubricating coating for upsetting titanium alloy wire for fasteners of the present invention is prepared with inorganic potassium silicate solution as a binder, graphite and molybdenum disulfide composite as a lubricant, polyoxyethylene ether dispersant as a wetting dispersant, organic silicon defoamer as a defoamer, and water as a dispersion medium. The lubricating coating is completely water-based, and has the characteristics of being green and environmentally friendly, fast curing at room temperature, simple coating, and easy removal of the coating.

[0036] The present invention is further described in detail below in conjunction with specific embodiments. In the following embodiments, the industrial-grade graphite particles used are micron or submicron-sized, and are composed of flake graphite agglomerated particles, with a particle purity of ≥90%, a particle size of ≤10 μm, and a graphite flake thickness of 100 to 200 nm; the molybdenum disulfide particles used are micron or submicron-sized, and are composed of flake molybdenum disulfide agglomerated particles, with a particle purity of ≥98%, a particle size of ≤5 μm, and a molybdenum disulfide flake thickness of 50 to 200 nm; the polyoxyethylene ether dispersant used is NP-4 nonylphenol polyoxyethylene ether dispersant, produced by Jinan Baoliyuan Chemical Co., Ltd.; the organosilicon defoamer used is Tego Foamex 1488 organic modified polysiloxane defoamer, produced by Guangzhou Lake Chemical Co., Ltd.

[0037] Embodiment 1:

[0038] In this embodiment, the lubricating coating components are prepared according to the following mass percentages: 45% inorganic potassium silicate solution, 8.5% graphite, 25.5% molybdenum disulfide, 4% polyoxyethylene ether dispersant, 2% organosilicon defoamer, and the balance 15% deionized water.

[0039] Coating preparation method:

[0040] The inorganic potassium silicate solution was prepared according to the mass percentage ratio of each component: first, 25% of the mass of the inorganic potassium silicate solution was hydrolyzed with deionized water (60%) required by the mass of the inorganic potassium silicate solution, and the pH value was adjusted to 3.5 with acetic acid. After stirring and hydrolyzing for 6 hours, 15% of the mass of the inorganic potassium silicate solution was added with inorganic potassium silicate with a modulus of 5, and the stirring was continued for 10 hours to obtain an inorganic potassium silicate solution;

[0041] 8.5% of graphite powder and 25.5% of molybdenum disulfide powder by weight of the lubricating coating are weighed, dispersed in deionized water containing 4% of polyoxyethylene ether dispersant and 2% of silicone defoamer, the amount of deionized water being 10% of the remaining 15% of deionized water, and ball milling is performed for 30 hours to obtain a mixed powder of graphite and molybdenum disulfide; 45% of the prepared inorganic potassium silicate solution by weight of the lubricating coating and the ball-milled mixed powder of graphite and molybdenum disulfide are fully mixed, and diluted with 5% deionized water in the remaining deionized water by weight of the lubricating coating to obtain a water-based lubricating coating for upsetting titanium alloy wire for fasteners.

[0042] Coating preparation method: prepare a 30-meter-long TC4 round wire with a wire specification of d5.0mm. The lubricating coating is directly coated on the surface of the light wire. The specific coating process is as follows:

[0043] (1) The coating thickness is controlled by adjusting the viscosity of the lubricating coating. The predetermined coating thickness is 3 to 7 μm. The water-based lubricating coating is diluted with 10% deionized water of the coating mass, and the mixture is fully stirred for use.

[0044] (2) Unroll the round wire to be coated and fix both ends to the rack with wire. Clean the surface of the wire with anhydrous ethanol before coating and let it dry in clean air to ensure that there is no contaminant attached to the surface of the wire.

[0045] (3) Pour the diluted water-based lubricating coating on the sponge to allow the sponge to fully absorb the coating. Hold the sponge with your hand so that the sponge wraps the wire, let the wire pass through the sponge and slide the sponge along the axis of the wire. During the sliding process, ensure that the wire is fully immersed in the sponge. The coated wire is left to stand for about 12 minutes at room temperature to completely cure. After curing, it is closed to obtain the water-based lubricating coating for upsetting titanium alloy coil wire for fasteners.

[0046] like Figure 1 As shown, the prepared water-based lubricating coating for upsetting titanium alloy disc wire for fasteners is uniform and complete, and the coating surface is flat and smooth without defects such as cracks, pinholes, and bubbles.

[0047] like Figure 2 As shown, the coating thickness on the surface of TC4 coiled wire is uniform, about 5.0 to 6.0 μm, meeting the predetermined coating thickness requirement.

[0048] The bolt upsetting test was carried out using TC4 coiled wire coated with water-based lubricating coating. A total of 300 bolts were upset with this batch of wires, and 0 defective products were found, with a qualified rate of 100%. The coating had good adhesion during the upsetting process and could play a lubricating role. The upset fasteners could be demoulded smoothly without problems such as sticking to the mold and material cracking. In the actual upsetting production of fasteners, more than 1,000 fasteners can be upset continuously using coiled wire coated with the water-based lubricating coating, which can meet the needs of continuous upsetting of fasteners.

[0049] Embodiment 2:

[0050] Coating preparation method: The distribution ratio and preparation method of the lubricating coating are the same as those in Example 1.

[0051] Coating preparation method: prepare another 30-meter-long TC10 round wire with a wire specification of d3.0mm. Perform fluorine-boration treatment on the wire surface before coating. The lubricating coating is coated on the fluorine-boration treated wire surface. The specific coating process is as follows:

[0052] (1) The coating thickness is controlled by adjusting the viscosity of the lubricating coating. The predetermined coating thickness is 3 to 5 μm. The water-based lubricating coating is diluted with 15% deionized water of the coating mass, and the mixture is fully stirred for use.

[0053] (2) Unroll the round wire to be coated and fix the two ends on the rack with wire. Clean the surface of the wire with petroleum ether before coating and let it dry in clean air to ensure that there is no contaminant attached to the surface of the wire.

[0054] (3) Pour the diluted water-based lubricating coating on the sponge to allow the sponge to fully absorb the coating. Hold the sponge with your hand so that the sponge wraps the wire, let the wire pass through the sponge and slide the sponge along the axis of the wire. During the sliding process, ensure that the wire is fully immersed in the sponge. The coated wire is left to stand for about 8 minutes at room temperature to completely solidify. After solidification, it is closed to obtain the water-based lubricating coating for upsetting titanium alloy coil wire for fasteners.

[0055] like Figure 3 As shown, the coating thickness on the surface of TC10 coiled wire is uniform, about 3.0 to 4.0 μm, meeting the predetermined coating thickness requirement.

[0056] like Figure 4 As shown in the figure, the bolt upsetting test was carried out using TC10 round wire coated with a water-based lubricating coating. The upset bolts could be demoulded smoothly without problems such as sticking to the mold and material cracking.

[0057] This batch of wires was used to uproot 300 bolts, with 0 defective products and a qualified rate of 100%. The coating had good adhesion during the uprooting process and could play a lubricating role. In the actual uprooting production of fasteners, the coiled wire coated with the water-based lubricating coating can be used to uproot more than 1,000 fasteners continuously, which can meet the needs of continuous uprooting of fasteners.

[0058] Embodiment 3:

[0059] In this embodiment, the lubricating coating components are prepared according to the following mass percentages: 40% inorganic potassium silicate solution, 7.5% graphite, 22.5% molybdenum disulfide, 4% polyoxyethylene ether dispersant, 2% organosilicon defoamer, and the balance 24% deionized water.

[0060] Coating preparation method: The preparation method (process and conditions) of the lubricating coating is the same as that of Example 1, except that the ratio of the lubricating coating components is different.

[0061] Coating preparation method: The water-based lubricating coating is directly coated on the surface of a 30-meter-long TC4 round wire (specification d5.0mm), and the coating preparation method is the same as Example 1. After coating, the coating thickness on the surface of the round wire is uniform, about 4.0-5.0μm, meeting the predetermined coating thickness requirement.

[0062] The TC4 round wire coated with the water-based lubricating coating was used for bolt upsetting test. A total of 300 bolts were upset with this batch of wire, 5 of which were defective and the pass rate was 98.3%. The coating had good adhesion during the upsetting process and could play a lubricating role. The upset fasteners could be demoulded smoothly without problems such as sticking to the mold and material cracking.

[0063] Embodiment 4:

[0064] In this embodiment, the lubricating coating components are prepared according to the following mass percentages: 52% inorganic potassium silicate solution, 8% graphite, 24% molybdenum disulfide, 4% polyoxyethylene ether dispersant, 2% organosilicon defoamer, and the balance 10% deionized water.

[0065] Coating preparation method: The preparation method (process and conditions) of the lubricating coating is the same as that of Example 1, except that the ratio of the lubricating coating components is different.

[0066] Coating preparation method: The water-based lubricating coating is directly coated on the surface of a 30-meter-long TC4 round wire (specification d5.0mm), and the coating preparation method is the same as Example 1. After coating, the coating thickness on the surface of the round wire is uniform, about 5.0-6.0 μm, meeting the predetermined coating thickness requirement.

[0067] The TC4 round wire coated with the water-based lubricating coating was used for bolt upsetting test. A total of 300 bolts were upset with this batch of wire, 3 of which were defective and the pass rate was 99.0%. The coating had good adhesion during the upsetting process and could play a lubricating role. The upset fasteners could be demoulded smoothly without problems such as sticking to the mold and material cracking.

[0068] Comparative Example 1:

[0069] In this comparative example, the lubricating coating components are prepared according to the following mass percentages: 45% inorganic potassium silicate solution, 5% graphite, 15% molybdenum disulfide, 4% polyoxyethylene ether dispersant, 2% organosilicon defoamer, and the balance 29% deionized water.

[0070] Coating preparation method: The lubricating coating preparation method (process and conditions) is the same as that in Example 1, except that the ratios of the lubricating coating components are different.

[0071] Coating preparation method: The water-based lubricating coating is directly coated on the surface of a 30-meter-long TC4 round wire (specification d5.0mm), and the coating preparation method is the same as Example 1. After coating, the coating thickness on the surface of the round wire is uniform, about 4.5-5.0μm, meeting the predetermined coating thickness requirement.

[0072] The TC4 round wire coated with the water-based lubricating coating was used for bolt upsetting test. A total of 100 bolts were upset with this batch of wire, 63 of which were defective and the pass rate was 37.0%. The coating had poor lubricity during the upsetting process, and the upset fasteners were difficult to demould and had hair pulling. The pass rate was low and could not meet the demand for continuous upsetting of fasteners.

[0073] Comparative Example 2:

[0074] In this comparative example, the lubricating coating components are prepared according to the following mass percentages: 30% inorganic potassium silicate solution, 8.5% graphite, 25.5% molybdenum disulfide, 4% polyoxyethylene ether dispersant, 2% organosilicon defoamer, and the balance 30% deionized water.

[0075] Coating preparation method: The preparation method (process and conditions) of the lubricating coating is the same as that of Example 1, except that the ratio of the lubricating coating components is different.

[0076] Coating preparation method: The water-based lubricating coating is directly coated on the surface of a 30-meter-long TC4 round wire (specification d5.0mm), and the coating preparation method is the same as Example 1. After coating, the coating thickness on the surface of the round wire is uniform, about 3.0 to 3.5 μm, meeting the predetermined coating thickness requirement.

[0077] A bolt upsetting test was carried out using TC4 round wire coated with the water-based lubricating coating. A total of 100 bolts were upset using this batch of wire, 72 of which were defective, with a pass rate of 28.0%. During the upsetting process, the coating had poor adhesion, the upset fasteners were difficult to demould, and the coating fell off. The pass rate was low and could not meet the needs of continuous upsetting of fasteners.

[0078] The results of the embodiments and comparative examples show that the water-based lubricating coating prepared by the present invention is completely water-based, green and environmentally friendly, cures quickly at room temperature, and is easy to apply; the water-based lubricating coating of the present invention can effectively reduce the friction between the wire and the mold during the upsetting of fasteners, avoid material cracking, extend the life of the mold, improve production efficiency, and can meet the needs of continuous upsetting of fasteners.

Claims

1. A water-based lubricating coating for upsetting titanium alloy wire for fasteners, characterized in that: The invention is prepared with an inorganic potassium silicate solution as a binder, a composite of graphite and molybdenum disulfide as a lubricant, a polyoxyethylene ether dispersant as a wetting dispersant, an organic silicon defoamer as a defoamer, and water as a dispersion medium.

2. The water-based lubricating coating according to claim 1, characterized in that: The components are prepared according to the following mass percentages: 40-55% (preferably 43-48%) of binder, 30-35% (preferably 32-35%) of lubricant, 2-4% of wetting and dispersing agent, 1-2% of defoaming agent, and the balance of water is added to 100%.

3. The water-based lubricating coating according to claim 1, characterized in that: The proportions of the components of the binder inorganic potassium silicate solution are prepared according to the following mass percentages: 20-35% (preferably 22-27%) of silane coupling agent 570, 10-25% (preferably 12-17%) of high modulus potassium silicate (modulus n≥5, preferably 5-7), and the balance is water; The preparation process is as follows: first add the required amount of silane coupling agent 570 into the required amount of water, adjust the pH value with acetic acid to control the pH value at 3.5-4.0, stir and hydrolyze for 6-8 hours, then add the required amount of high modulus potassium silicate (modulus n≥5), and continue stirring for 8-10 hours to obtain an inorganic potassium silicate solution.

4. The water-based lubricating coating according to claim 1, characterized in that: The mass ratio of the lubricant graphite to molybdenum disulfide is 1:(2-4), preferably 1:(2.5-3.5), and more preferably 1:(2.8-3.2).

5. The water-based lubricating coating according to claim 1 or 4, characterized in that: The industrial-grade graphite particles are micron or submicron-sized, and are composed of flake graphite agglomerated particles, with a particle purity of ≥90%, a particle size of ≤10 μm, and a graphite flake thickness of 100 to 200 nm; The molybdenum disulfide particles are micron or submicron-sized and are agglomerated particles of flaky molybdenum disulfide. The particle purity is ≥98%, the particle size is ≤5μm, and the thickness of the molybdenum disulfide flaky layer is 50-200nm.

6. A method for preparing the water-based lubricating coating according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: (1) firstly hydrolyzing the silane coupling agent 570 with water, and then adding high modulus potassium silicate (modulus n ≥ 5) to obtain an inorganic potassium silicate solution; (2) Weighing graphite powder and molybdenum disulfide powder in the required proportion, dispersing them in part or all of the required balance of water with the required amount of wetting and dispersing agent and the required amount of defoaming agent, and ball milling them for 20 to 40 hours; (3) The inorganic potassium silicate solution prepared in step (1) and the mixed powder of graphite and molybdenum disulfide ball-milled in step (2) are fully mixed, with no or excess water added, to obtain a water-based lubricating coating for upsetting titanium alloy wire for fasteners.

7. Use of the water-based lubricating coating according to any one of claims 1 to 5 as a lubricating coating on the surface of wire in a process of upsetting fasteners from titanium alloy wire.

8. The use according to claim 7, characterized in that: The water-based lubricating coating according to any one of claims 1 to 5 is coated on the surface of the light wire or the surface of the pre-treated wire by dipping, and the coated wire can be completely cured at room temperature, and the curing time is 3 to 20 minutes.

9. The use according to claim 8, characterized in that: Pretreatment refers to the surface treatment of the wire by one or more of phosphating, fluorinated boronizing or sandblasting to increase the surface roughness of the wire and make the coating adhere well.

10. The use according to claim 8, characterized in that: Before coating, the surface of the wire to be coated should be cleaned with anhydrous ethanol and / or petroleum ether, and left to dry in the air. The coating can only be carried out after visual inspection to ensure that there is no contaminant attached to the surface of the wire to be coated; According to the coating thickness requirement, the water-based lubricating coating described in any one of claims 1 to 5 does not need to be diluted or can be diluted with water, the amount of water used is not greater than (less than or equal to) 20% of the mass of the water-based lubricating coating, and can be applied after being fully stirred.

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