Painting and conveying high temperature lubricants

Abstract

The invention discloses a coating delivery high-temperature lubricant, and relates to the technical field of lubricating compositions. Compared with the prior art, the invention does not contain a siliceous additive, and the siliceous additive will reduce the compatibility of the lubricant with the paint, thereby causing shrinkage holes in the paint film, affecting the integrity of the product. The coating delivery lubricant of the present invention adds linseed oil and liquid paraffin as the base oil of the high-temperature lubricant, which plays a major lubricating role, and also adds polyethylene glycol, PTFE, 4-hydroxy salicylamide and mica powder particles. The added mica powder particles are used as fillers and synergists, which can increase the viscosity and stability of the lubricant, improve the structure and performance of the lubricating film, and can also improve the wear resistance and anti-adhesion performance of the lubricant, which plays a role in reducing friction, extending the service life of the equipment and improving product quality during the coating delivery process.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating compositions, and in particular to a coating and conveying high-temperature lubricant. Background Art

[0002] Coating conveying refers to the process of conveying objects from one workstation to another to complete the coating or spraying process. It can be done through conveyor belts, rollers, chains or other types of conveying devices. The automated transportation process reduces manual operations and improves production efficiency. The main purpose of using lubricants in the coating conveying process is to reduce friction, protect conveying equipment, extend the service life of equipment, improve operating efficiency, and ensure the quality and consistency of the conveying process. The lubricant for the coating conveying process should have good lubrication properties, be able to reduce friction and wear, reduce the energy consumption of conveying equipment, and ensure the smooth movement of objects during the conveying process; the coating process may involve high temperature environments, and the lubricant should have good high temperature resistance to ensure that it can still effectively lubricate under high temperature conditions and will not decompose or fail; it is best to reduce the adhesion and contamination between the object and the surface of the conveying equipment, and prevent impurities or contaminants from adhering to the object during the coating process, thereby ensuring the coating quality and surface finish to ensure the consistency and quality of the product.

[0003] To improve the high-temperature lubricant for coating delivery, it is necessary to maintain physical and chemical stability in a high-temperature environment, not decompose, volatilize or fail, and maintain a low friction coefficient to reduce contact and wear between metal surfaces. Lubricants suitable for high-temperature stability can be selected, which can form a uniform lubricating film at high temperatures, reduce direct contact between metal surfaces, and reduce the friction coefficient; under high temperature conditions, lubricants are easy to evaporate or decompose, resulting in rupture of the lubricating film and increased friction, so it is necessary to select lubricants with low evaporation, or ensure that sufficient lubricant supply is provided at the lubrication site to maintain the integrity and stability of the lubricating film; for mechanical systems working under high temperature and high pressure conditions, adding additives with extreme pressure properties can effectively reduce contact and wear between metal surfaces. Extreme pressure additives can form a protective film under high pressure, reduce direct contact between metals, and thus reduce the friction coefficient.

[0004] CN112940824A discloses an application and preparation method of a lubricating oil additive, a high-temperature lubricating oil, a preparation method and an application thereof. The silicon diphosphide nanosheets provided by the invention are added to the lubricating oil as a lubricating oil additive, have good dispersibility and dispersion stability, can make the lubricating oil still have a low friction coefficient and wear rate under high temperature and high speed working conditions, and still have good friction reduction and anti-wear effects under 150°C and 200°C conditions, solving the technical problem of high friction coefficient and wear rate of lubricating oil under high temperature and high speed working conditions in the prior art.

[0005] CN115216357A discloses a high temperature resistant lubricating oil antioxidant and its preparation method and application. The raw materials for preparation include, by weight, 3-20 parts of phenolic antioxidant, 10-40 parts of amine antioxidant, 20-40 parts of polycyclic antioxidant, and 20-40 parts of organic phosphorus compound. The invention greatly prolongs the oxidation induction period of high temperature chain oil under the condition of high temperature of 240°C, greatly improves the antioxidant capacity of high temperature chain oil, and achieves a good antioxidant effect with an addition amount of 1.2% by mass fraction in the chain oil, reaching an effect of more than 25min oxidation induction period, and at the same time makes the chain oil have less evaporation at a high temperature of 250°C. The invention has good high temperature antioxidant ability, can reduce the oxidation discoloration of chain oil under high temperature environment, and the antioxidant has a good dispersion effect in chain oil and grease, and has good storage stability.

[0006] The solutions reported in the above patent documents are all lubricants suitable for high-temperature working environments. They can solve the problems of friction coefficient and wear rate in high-temperature environments, but cannot simultaneously solve the problem of lubricant adhesion during the actual transportation process. Reducing adhesion can not only reduce equipment accidents and reduce lubricant loss, but also reduce the possibility of impurities or contaminants adhering to the product surface during transportation, thereby improving production efficiency and output. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to reduce the friction coefficient and wear rate of the lubricant in a high-temperature working environment, as well as the adhesion problem of the lubricant during the actual transportation process.

[0008] To achieve the above object, the present invention provides a coating delivery high-temperature lubricant, comprising the following components:

[0009] Flaxseed oil

[0010] Liquid paraffin

[0011] Polyethylene glycol

[0012] PTFE

[0013] 4-Hydroxysalicylamide

[0014] Mica powder particles.

[0015] Preferably, the following components are included in weight:

[0016] 20-30 parts linseed oil

[0017] 15-20 parts of liquid paraffin

[0018] 8-10 parts of polyethylene glycol

[0019] PTFE 1-3 parts

[0020] 1-2 parts of 4-hydroxysalicylamide

[0021] 1-5 parts of mica powder particles.

[0022] The method for preparing mica powder particles comprises the following steps:

[0023] S1: Add mica powder to water, disperse for 10-30 minutes, add oleic acid, add sodium hydroxide aqueous solution dropwise to adjust the pH value to 12-13, stir at 160-180°C for 10-12 hours, cool naturally to room temperature, filter, wash the filter cake with water 2-4 times, dry at 75-85°C for 2-6 hours, grind and sieve to obtain modified mica powder;

[0024] S2: Add modified mica powder and polyvinyl pyrrolidone to water, ultrasonically disperse for 0.5-1 hour to obtain a dispersion, then add polyphenylene sulfide and 1,2-divinylbenzene to a paraffin-ethanol mixed solution, and then add them to the dispersion, stir at room temperature for 4-6 hours, filter, and dry the filter cake at 75-85°C to obtain mica powder particles.

[0025] The particle size of the mica powder in step S1 is 10-20 microns.

[0026] The concentration of the sodium hydroxide aqueous solution in step S1 is 30-40wt% of the sodium hydroxide aqueous solution.

[0027] In the step S1, the mass ratio of mica powder: water: oleic acid is 1-3: 15-30: 0.1-0.3.

[0028] In the step S2, the mass ratio of modified mica powder, polyvinyl pyrrolidone: water: polyphenylene sulfide, 1,2-divinylbenzene: ethanol-paraffin mixed solution is 1-3: 0.5-1.5: 15-30: 1-3: 0.5-1.5: 15-30.

[0029] The paraffin in the paraffin-ethanol mixed solution in step S2 is a 50-60wt% paraffin-ethanol mixed solution.

[0030] The preparation method of the coating and conveying high-temperature lubricant is as follows:

[0031] Add linseed oil and liquid paraffin into a reaction kettle, heat to 70-80° C. and stir for 0.5-1 hour to mix evenly, then add polyethylene glycol, PTFE and 4-hydroxysalicylicylamide, continue stirring for 1-2 hours, cool to room temperature, add mica powder particles, and ultrasonically disperse for 20-30 minutes to obtain the high-temperature lubricant.

[0032] In the coating and conveying lubricant of the present invention, linseed oil is used as the base oil of the high-temperature lubricant to provide lubricating performance and thermal stability. Linseed oil has good high-temperature resistance and chemical stability, and can form a stable lubricating film under high-temperature environment to reduce the friction coefficient and wear rate. Liquid paraffin as a component of the lubricant can form a lubricating film to reduce the friction and wear between the mechanical moving parts during the coating and transportation process. At the same time, liquid paraffin can also increase the consistency and viscosity of the lubricant and improve the durability of the lubricating effect. Polyethylene glycol has good lubricity, thickening, moisture retention and dispersibility, so that it can be more evenly covered on the friction surface and improve the durability of the lubricating film. PTFE has excellent lubricating performance and chemical resistance. It is used as an additive to reduce friction, wear, and increase the life of mechanical parts. The present invention adds micron-level PTFE to the lubricant to form a thin film on the friction surface to reduce friction and improve the lubricating effect. 4-Hydroxysalicylamide, as an antioxidant, forms a thin film covering the metal surface to play a protective role. This film can prevent the metal surface from directly contacting oxygen in the air, reduce the generation of oxidation products, and extend the service life of mechanical equipment. It has a certain thermal stability and can maintain the stability of its chemical structure within a certain temperature range. Mica powder particles, as fillers and synergists, can increase the viscosity and stability of lubricants, improve the structure and performance of lubricating films, and can also improve the wear resistance and anti-adhesion properties of lubricants, reducing the practical application problems of lubricants in the coating and transportation process.

[0033] The role of mica powder in high-temperature lubricants is to increase the lubrication effect and reduce the friction coefficient. Mica powder has a layered structure and can form a lubricating film on the friction surface, reducing the direct contact between metal surfaces, thereby reducing friction and wear. Oleic acid is a fatty acid that is often used as a surfactant for emulsification, dispersion and stabilization of systems. Oleic acid molecules are firmly fixed on the surface of mica powder. By modifying the mica powder, hydrophobic groups are formed on the surface, which enhances the dispersibility of the mica powder and helps to evenly disperse it in the lubricant. Under harsh working conditions such as high temperature, high speed and heavy load, friction loss may cause serious wear and damage to friction parts. Polyphenylene sulfide has excellent high temperature resistance and can form a uniform lubricating film on the friction surface, playing a good lubricating role on the friction surface; and it remains stable in high temperature environment and is not easy to decompose or oxidize, thereby protecting the lubricant and friction parts from high temperature; its viscosity will decrease with the increase of temperature, because the increase of temperature will increase the mobility of molecules and weaken the interaction between molecules, so that its fluidity increases and viscosity decreases, but at room temperature, it has strong adhesion and adsorbs between the layered structure, and can form a layer of lubricating film covering the surface of mica powder in the lubricant. This layer of lubricating film can effectively prevent the evaporation of volatile components in linseed oil, thereby reducing the volatility of the lubricant. 1,2-Divinylbenzene helps polyphenylene sulfide to better adsorb on the surface of modified mica powder. Polyvinyl pyrrolidone has excellent dispersing properties as a dispersant, which can make the particles evenly dispersed in the liquid, which helps to improve the dispersion and stability of mica powder particles in the lubricant. During the coating transportation process, mica powder particles form a protective film on the friction surface, which reduces the contact between the base oil and other components and the external environment, reduces the volatility of the lubricant in a high temperature environment, and improves the stability and service life of the lubricant. It plays a role in reducing friction, extending the service life of equipment and improving product quality during the coating transportation process.

[0034] Beneficial effects of the present invention:

[0035] Compared with the prior art, linseed oil and liquid paraffin are added to the coating conveying lubricant of the present invention as the base oil of the high-temperature lubricant, which plays a major lubricating role. 4-Hydroxy salicylamide is also added as an antioxidant to form a thin film covering the metal surface to play a protective role. The added mica powder particles serve as fillers and synergists, which can increase the viscosity and stability of the lubricant and improve the structure and performance of the lubricating film. The mica powder particles can also improve the wear resistance and anti-adhesion performance of the lubricant, and play a role in reducing friction, extending the service life of equipment and improving product quality during the coating conveying process. The present invention does not contain siliceous additives, which will reduce the compatibility of the lubricant with the paint, thereby causing shrinkage holes in the paint film and affecting the integrity of the product. DETAILED DESCRIPTION

[0036] The parameters of the specific chemical substances used in the examples are from the following sources:

[0037] Linseed oil: low viscosity polymerized linseed oil, active ingredient 100wt%, manufacturer is Shaoguan Derui Chemical Industry Co., Ltd., brand is JC series.

[0038] PTFE: particle size is 3-5μm, specific surface area is 5-15m 2 / g, specific gravity is 2.2g / cm 3 .

[0039] 4-Hydroxysalicylamide: industrial grade, manufacturer is Henan Weitixi Chemical Technology Co., Ltd., item number is A0147453.

[0040] Mica powder: purity 99wt%, whiteness 60, particle size 10μm.

[0041] Polyphenylene sulfide: powder, high fluidity, hardness of 95HB, shrinkage rate of 1.2-1.5%, manufacturer is Dongguan Hualixing Plastic Raw Materials Co., Ltd., brand number 0205.

[0042] Polyethylene glycol: The brand is Saudi Arabia, the manufacturer is Jinan Qihang Chemical Technology Co., Ltd., and the model is PEG400.

[0043] Polyvinylpyrrolidone: The manufacturer is Wuhan Jixinyibang Biotechnology Co., Ltd., model number is R173.

[0044] Liquid paraffin: The manufacturer is Jinan Jinxuyuan New Materials Co., Ltd., and the item number is +9+63.

[0045] Polystyrene: The manufacturer is a strong supplier of Suzhou Wenge Plastic Co., Ltd., and the item number is 525.

[0046] Polymethyl methacrylate: The manufacturer is Daqing Linqiang Oil Products Co., Ltd., and the product number is LYZ6001.

[0047] Example 1

[0048] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0049] 2500 g of linseed oil and 1700 g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75° C. and stirred for 0.5 hour to mix evenly, then 800 g of polyethylene glycol, 250 g of PTFE and 180 g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, and ultrasonic dispersion was performed at 25 kHz for 20 minutes to obtain the high-temperature lubricant.

[0050] Example 2

[0051] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0052] 4200 g of linseed oil was added to the reaction kettle, the temperature was raised to 75° C. and stirred for 0.5 hour to mix evenly, then 800 g of polyethylene glycol, 250 g of PTFE and 180 g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, and ultrasonic dispersion was performed at 25 kHz for 20 minutes to obtain the high-temperature lubricant.

[0053] Example 3

[0054] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0055] 4200 g of liquid paraffin was added to the reaction kettle, the temperature was raised to 75° C. and stirred for 0.5 hour to mix evenly, then 800 g of polyethylene glycol, 250 g of PTFE and 180 g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, and ultrasonic dispersion was performed at 25 kHz for 20 minutes to obtain the high-temperature lubricant.

[0056] Example 4

[0057] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0058] 2500 g of linseed oil and 1700 g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75° C. and stirred for 0.5 hour to mix evenly, and then 800 g of polyethylene glycol and 180 g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, and ultrasonic dispersion was performed at 25 kHz for 20 minutes to obtain the high-temperature lubricant.

[0059] Example 5

[0060] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0061] 2500g of linseed oil and 1700g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75°C and stirred for 0.5 hour to mix evenly, 800g of polyethylene glycol, 250g of PTFE and 180g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, 400g of mica powder was added after cooling to room temperature, and ultrasonic dispersion was performed at 25kHz for 20 minutes to obtain the high-temperature lubricant.

[0062] Example 6

[0063] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0064] Add 2500g linseed oil and 1700g liquid paraffin to the reaction kettle, heat to 75°C and stir for 0.5 hour to mix evenly, then add 800g polyethylene glycol, 250g PTFE and 180g 4-hydroxysalicylicylamide, continue stirring for 1 hour, cool to room temperature, add 400g modified mica powder, and perform ultrasonic dispersion at 25kHz for 20 minutes to obtain the high-temperature lubricant.

[0065] The preparation method of the modified mica powder comprises the following steps:

[0066] 400 g of mica powder was added to 5000 ml of water, and ultrasonically dispersed at 25 kHz for 15 minutes, 50 g of oleic acid was added, and a 35 wt % sodium hydroxide aqueous solution was added dropwise to adjust the pH value to 12, and stirred at 160° C. for 12 hours, cooled naturally to room temperature, filtered, and the filter cake was washed with water twice, dried at 80° C. for 4 hours, and ground and sieved to obtain modified mica powder;

[0067] Example 7

[0068] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0069] 2500g of linseed oil and 1700g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75°C and stirred for 0.5 hour to mix evenly, 800g of polyethylene glycol, 250g of PTFE and 180g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, the mixture was cooled to room temperature and 400g of mica powder particles were added, and ultrasonic dispersion was performed at 25kHz for 20 minutes to obtain the high-temperature lubricant.

[0070] The method for preparing the mica powder particles comprises the following steps:

[0071] 220 g of mica powder and 80 g of polyvinyl pyrrolidone were added to 2500 g of water, and ultrasonic dispersion was performed at 25 kHz for 0.5 hour to obtain a dispersion. Then, 120 g of polyphenylene sulfide and 60 g of 1,2-divinylbenzene were added to 2500 g of a 50 wt% paraffin-ethanol mixed solution, and then added to the dispersion. The mixture was stirred at room temperature for 5 hours, filtered, and the filter cake was dried at 80° C. to obtain mica powder particles.

[0072] Example 8

[0073] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0074] 2500g of linseed oil and 1700g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75°C and stirred for 0.5 hour to mix evenly, 800g of polyethylene glycol, 250g of PTFE and 180g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, the mixture was cooled to room temperature and 400g of mica powder particles were added, and ultrasonic dispersion was performed at 25kHz for 20 minutes to obtain the high-temperature lubricant.

[0075] The method for preparing the mica powder particles comprises the following steps:

[0076] S1: Add 200g mica powder to 2500ml water, disperse with 25kHz ultrasonic wave for 15 minutes, add 25g oleic acid, add 35wt% sodium hydroxide aqueous solution to adjust the pH value to 12, stir at 160℃ for 12 hours, cool naturally to room temperature, filter, wash the filter cake twice, dry at 80℃ for 4 hours, grind and sieve to obtain modified mica powder;

[0077] S2: Add 220g of modified mica powder and 80g of polyvinyl pyrrolidone to 2500g of water, and disperse them ultrasonically at 25kHz for 0.5 hour to obtain a dispersion. Then, add 120g of polyphenylene sulfide and 60g of 1,2-divinylbenzene to 2500g of a 50wt% paraffin-ethanol mixed solution, and then add them to the dispersion. Stir at room temperature for 5 hours, filter, and dry the filter cake at 80°C to obtain mica powder particles.

[0078] Comparative Example 1

[0079] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0080] 2500g of linseed oil and 1700g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75°C and stirred for 0.5 hour to mix evenly, 800g of polyethylene glycol, 250g of PTFE and 180g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, the mixture was cooled to room temperature and 400g of mica powder particles were added, and ultrasonic dispersion was performed at 25kHz for 20 minutes to obtain the high-temperature lubricant.

[0081] The method for preparing the mica powder particles comprises the following steps:

[0082] S1: Add 200g mica powder to 2500ml water, disperse with 25kHz ultrasonic wave for 15 minutes, add 25g oleic acid, add 35wt% sodium hydroxide aqueous solution to adjust the pH value to 12, stir at 160℃ for 12 hours, cool naturally to room temperature, filter, wash the filter cake twice, dry at 80℃ for 4 hours, grind and sieve to obtain modified mica powder;

[0083] S2: Add 220g of modified mica powder and 80g of polyvinyl pyrrolidone to 2500g of water, and disperse them ultrasonically at 25kHz for 0.5 hour to obtain a dispersion. Then, add 120g of polymethacrylate and 60g of 1,2-divinylbenzene to 2500g of a 50wt% paraffin-ethanol mixed solution, and then add them to the dispersion. Stir at room temperature for 5 hours, filter, and dry the filter cake at 80°C to obtain mica powder particles.

[0084] Comparative Example 2

[0085] A method for preparing a coating and conveying high-temperature lubricant is as follows:

[0086] 2500g of linseed oil and 1700g of liquid paraffin were added to the reaction kettle, the temperature was raised to 75°C and stirred for 0.5 hour to mix evenly, 800g of polyethylene glycol, 250g of PTFE and 180g of 4-hydroxysalicylicylamide were added, stirring was continued for 1 hour, the mixture was cooled to room temperature and 400g of mica powder particles were added, and ultrasonic dispersion was performed at 25kHz for 20 minutes to obtain the high-temperature lubricant.

[0087] The method for preparing the mica powder particles comprises the following steps:

[0088] S1: Add 200g mica powder to 2500ml water, disperse with 25kHz ultrasonic wave for 15 minutes, add 25g oleic acid, add 35wt% sodium hydroxide aqueous solution to adjust the pH value to 12, stir at 160℃ for 12 hours, cool naturally to room temperature, filter, wash the filter cake twice, dry at 80℃ for 4 hours, grind and sieve to obtain modified mica powder;

[0089] S2: Add 220g of modified mica powder and 80g of polyvinyl pyrrolidone to 2500g of water, and disperse them ultrasonically at 25kHz for 0.5 hour to obtain a dispersion. Then, add 120g of polystyrene and 60g of 1,2-divinylbenzene to 2500g of a 50wt% paraffin-ethanol mixed solution, and then add them to the dispersion. Stir at room temperature for 5 hours, filter, and dry the filter cake at 80°C to obtain mica powder particles.

[0090] Test Example 1

[0091] The performance of the high-temperature lubricants obtained in Examples 1-8 and Comparative Examples 1-2 was tested at room temperature. The test was based on the national standard GB / T 3142-2019 "Determination of the load-bearing capacity of lubricants - Four-ball method". According to the maximum no-seizure load (P B ), sintering load (PD) and the friction spot diameter d of the steel ball 平均 Three indicators are used to judge lubricity and wear resistance. The steel ball in the test is a special test steel ball for a four-ball machine, with a diameter of 12.7mm and a hardness of HRC65. The test data is summarized in Table 1.

[0092] Table 1 Performance test data of lubricity and wear resistance

[0093]

[0094]

[0095] The maximum no-seizure load refers to the highest load at which no seizure occurs under test conditions, that is, the oil film strength; the higher the maximum no-seizure load, the better the lubrication performance and the more wear-resistant the surface.

[0096] The sintering load refers to the minimum load under test conditions that causes the upper and lower steel balls to sinter due to excessive load. The load at which the equipment has to stop operating is the sintering load, which is the ultimate working capacity of the lubricant. The higher the sintering load, the better the lubricating performance of the lubricant and the less likely it is to sinter.

[0097] Wear marks refer to the wear caused by friction on the surface of the steel ball under test conditions. The diameter of the marks is the wear mark. If the edge of the wear mark is blurred or irregular, the wear mark diameter is determined by estimation. If the wear mark has an abnormal shape or there are obvious scratches on the surface, even if it is smaller than the table value, it can be directly judged that the oil film has been broken at this time; the smaller the wear mark, the better the lubrication performance and wear resistance of the lubricant.

[0098] In Test Example 1, the maximum non-seizure load, sintering load and wear spot diameter of the steel ball of the high-temperature lubricants obtained in Examples 1-8 and Comparative Examples 1-2 were tested respectively. In Example 1, the high-temperature lubricant formula is linseed oil, liquid paraffin, polyethylene glycol, PTFE, and 4-hydroxy salicylamide. Compared with Example 1, Examples 2-4 respectively cancel the liquid paraffin, linseed oil, and PTFE components. From the performance test, it can be seen that the effect is lower than that of Example 1. Compared with Example 1, Example 5 adds mica powder, and Examples 6-8 further modify the mica powder. By comparison, it can be seen that Example 8 has the best effect. Compared with Example 8, Comparative Examples 1-2 replace the modified polymer, and replace polyphenylene sulfide with polymethacrylate and polystyrene respectively, and the effect is lower than that of Example 8. It can be seen that the maximum non-seizure load and sintering load of Example 8 are the largest, and the wear spot diameter is the smallest, which can explain that the better the lubrication performance of the high-temperature lubricant, the more wear-resistant the surface.

[0099] Test Example 2

[0100] The performance tests were performed on the high temperature lubricants obtained in Examples 1-8 and Comparative Examples 1-2, respectively. The tests were performed in accordance with the national standard GB / T 265-1988 "Method for determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products". Four experiments were performed on each oil sample, and the average value of the four experiments was recorded as the viscosity value of the oil sample. The test data are summarized in Table 2.

[0101] Table 2 Dynamic viscosity test data

[0102] <![CDATA[Kinematic viscosity at 40 °C (mm 2 / s)]]> <![CDATA[Kinematic viscosity at 100℃ (mm 2 / S)]]> Example 1 55.24 10.64 Example 2 47.63 13.92 Example 3 44.90 12.88 Example 4 41.54 9.77 Example 5 40.95 8.95 Example 6 38.45 8.12 Example 7 37.95 6.95 Example 8 35.45 5.82 Comparative Example 1 36.58 6.11 Comparative Example 2 36.50 6.08

[0103] In Test Example 2, the high-temperature lubricants obtained in Examples 1-8 and Comparative Examples 1-2 were tested for dynamic viscosity. In Example 1, the high-temperature lubricant formula was linseed oil, liquid paraffin, polyethylene glycol, PTFE, and 4-hydroxy salicylamide. Compared with Example 1, Examples 2-4 eliminated the components of liquid paraffin, linseed oil, and PTFE, respectively. Compared with Example 1, Example 5 added mica powder, and Examples 6-8 further modified the mica powder. Compared with Example 8, Comparative Examples 1-2 replaced the modified polymer, replacing polyphenylene sulfide with polymethacrylate and polystyrene, respectively. By comparison, it can be seen that the high-temperature lubricant obtained in Example 8 of the present invention has a higher viscosity at low temperature (40°C) and a lower viscosity at high temperature (100°C), indicating that the viscosity of the lubricant decreases with increasing temperature, which can be explained that it can better adhere to the friction surface at low temperature, and has anti-stickiness in the actual transportation process, that is, in a high-temperature working environment.

Claims

1. A coating and delivery method for high temperature lubricant, characterized in that: It comprises the following components in parts by weight: 20-30 parts of linseed oil, 15-20 parts of liquid paraffin, 8-10 parts of polyethylene glycol, PTFE 1-3 parts, 1-2 parts of 4-hydroxy salicylamide, 1-5 parts of mica powder particles; The method for preparing mica powder particles comprises the following steps: S1: Add mica powder to water, disperse for 10-30 minutes, add oleic acid, add sodium hydroxide aqueous solution dropwise to adjust the pH value to 12-13, stir at 160-180°C for 10-12 hours, cool naturally to room temperature, filter, wash the filter cake with water 2-4 times, dry at 75-85°C for 2-6 hours, grind and sieve to obtain modified mica powder; S2: adding modified mica powder and polyvinyl pyrrolidone to water, ultrasonically dispersing for 0.5-1 hour to obtain a dispersion, then adding polyphenylene sulfide and 1,2-divinylbenzene to a paraffin-ethanol mixed solution, and then adding the mixture to the dispersion, stirring at room temperature for 4-6 hours, filtering, and drying the filter cake at 75-85° C. to obtain mica powder particles; In the step S1, the mass ratio of mica powder: water: oleic acid is 1-3: 15-30: 0.1-0.3; In the step S2, the mass ratio of modified mica powder, polyvinyl pyrrolidone: water: polyphenylene sulfide, 1,2-divinylbenzene: paraffin-ethanol mixed solution is 1-3: 0.5-1.5: 15-30: 1-3: 0.5-1.5: 15-30.

2. The coating and delivery high temperature lubricant according to claim 1, characterized in that: The particle size of the mica powder in step S1 is 10-20 microns.

3. The coating and delivery high temperature lubricant according to claim 1, characterized in that: The sodium hydroxide aqueous solution in step S1 has a concentration of 30-40wt% sodium hydroxide aqueous solution.

4. The coating and delivery high temperature lubricant according to claim 1, characterized in that: The paraffin in the paraffin-ethanol mixed solution in step S2 is a 50-60wt% paraffin-ethanol mixed solution.

5. A method for preparing a coating and conveying high-temperature lubricant as claimed in any one of claims 1 to 4, characterized in that: The preparation method is as follows: Add linseed oil and liquid paraffin into a reaction kettle, heat to 70-80° C. and stir for 0.5-1 hour to mix evenly, then add polyethylene glycol, PTFE and 4-hydroxysalicylicylamide, continue stirring for 1-2 hours, cool to room temperature, add mica powder particles, and ultrasonically disperse for 20-30 minutes to obtain the high-temperature lubricant.

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