Shapeable emulsion gel lubricant and method of making and using same

Abstract

The present application relates to a shapeable emulsion gel lubricant and its preparation method and application, a graphene oxide aqueous dispersion is mixed with an aminopropyl-terminated polydimethylsiloxane oil solution to prepare a semi-solid gel lubricant by adjusting the pH, oil-water ratio and raw material concentration of the system, and the prepared emulsion gel lubricant has underwater printability, excellent air / underwater lubricity and corrosion resistance. The preparation process of the present application is simple, the semi-solid gel lubricant prepared has good stability, is convenient to store and transport, and is easy to industrialize.

Description

TECHNICAL FIELD

[0001] The present application relates to a shapeable emulsion gel lubricant and its preparation method and application, the prepared emulsion gel lubricant has underwater printability, excellent air / underwater lubricity and corrosion resistance, and belongs to the field of lubricant preparation. BACKGROUND

[0002] Friction and wear have a huge impact on energy, environment, technology and economy at a global level. According to statistics, about 1 / 5 of the total world energy consumption is used to overcome the friction generated by moving parts, and wear causes about 80% of machine parts to fail, and more than 50% of mechanical equipment accidents are caused by lubrication failure or excessive wear. Especially for mechanical equipment that needs to operate underwater, such as deep-sea oil and gas exploitation, ship engineering, underwater exploration, etc., water, oxygen and salt in the environment can easily cause equipment corrosion, aggravate wear and cause water pollution, so a low-toxicity lubricant that can reduce friction, wear and corrosion is needed to ensure the long-term stable operation of the equipment in the underwater environment. At present, the commonly used lubricants are mainly lubricating oil and grease, but both of them still have many problems in actual operation, especially in harsh underwater environments (such as marine environment, etc.), such as: leakage and creep of lubricating oil, sedimentation of lubricating additives and oil separation of grease can all cause friction failure, resulting in serious wear and environmental pollution of mechanical equipment.

[0003] In recent years, emulsion lubricants have been widely used in the field of metal processing due to their good cooling performance and low cost. In particular, pickering emulsion stabilized by nanomaterials can not only improve the load capacity of the lubricant and repair the surface of the substrate by filling the pores during friction, but also effectively alleviate the problem of additive sedimentation due to the stable existence of the oil-water interface. Graphene oxide has excellent friction and wear resistance, and has been extensively studied as a lubricating additive. Moreover, due to the presence of both hydrophilic oxygen-containing groups and hydrophobic aromatic rings in its structure, graphene oxide has great advantages as a solid emulsifier and is commonly used to prepare pickering emulsion. For example, CN114437858A discloses a method for preparing graphene oxide lubricating oil. The method first modifies graphene oxide by mixing graphene oxide, alkylamine and dimethylformamide, and then mixes the modified graphene oxide with ionic liquid and base oil surfactant under ultrasonic waves to obtain graphene oxide lubricating oil. However, emulsion lubricants are in liquid state, and still have problems such as leakage and creep.

[0004] The emulsion gel is used as the lubricant, which is an effective solution to the above problems. The emulsion gel lubricant is semi-solid, and has the advantages of both emulsion and gel. The emulsion gel lubricant can flow and lubricate when the moving parts in the machine are sheared, and reduce the friction and wear between the friction pairs. However, the emulsion gel lubricant can restore a certain viscosity after the shearing stops, effectively avoiding the problems of loss and creep faced by the lubricating oil. In addition, the emulsion gel lubricant has better protection effect than the lubricating oil due to the semi-solid property of the gel, which can slow down the corrosion of the equipment. The amphiphilic substances in the emulsion gel can interact with the lubricating oil to form a stable emulsion structure, reducing the possibility of oil separation and additive sedimentation during long-term storage. In addition, the water in the emulsion gel lubricant can play a cooling role, effectively reducing the heat generated during friction. However, the application research of the emulsion gel is mostly in the fields of food and cosmetics, and there are few reports on the application of the emulsion gel in the field of lubrication, especially in underwater lubrication. SUMMARY

[0005] In view of the above problems in the prior art, the inventors of the present application have conducted in-depth and extensive research in the field of lubricants, and found that the emulsion gel used as the lubricant can not only effectively avoid the problems of loss and creep faced by the lubricating oil, but also has better protection effect than the lubricating oil due to the semi-solid property of the gel, which can slow down the corrosion of the equipment. The amphiphilic substances in the emulsion gel can interact with the lubricating oil to form a stable emulsion structure, reducing the possibility of oil separation and additive sedimentation during long-term storage. In addition, the water in the emulsion gel lubricant can play a cooling role, effectively reducing the heat generated during friction. The present application is completed based on the above findings.

[0006] The first object of the present application is to provide a plastic emulsion gel lubricant. The emulsion gel lubricant has underwater printability, excellent air / underwater lubricity and corrosion resistance, and can exist stably for more than one year.

[0007] The second object of the present application is to provide a preparation method of the plastic emulsion gel lubricant. The method has simple preparation process and green and non-toxic raw materials.

[0008] The third object of the present application is to provide the application of the plastic emulsion gel lubricant. The emulsion gel lubricant of the present application can be applied to the lubrication of parts in various underwater environments such as biological tissue engineering, deep-sea exploration, ship engineering and the like.

[0009] The technical solutions for achieving the above objects of the present application can be summarized as follows:

[0010] A plastic emulsion gel lubricant, which is a water / oil (W / O) emulsion gel system, comprises a water phase, an oil phase and an emulsifier, the water phase is a water dispersion, the oil phase is a base oil, and the emulsifier is a polymer surfactant.

[0011] According to the application, preferably, the concentration of the GO nanosheet aqueous dispersion ranges from 0.15 to 1.5 mg / mL, and more preferably from 0.3 to 1 mg / mL.

[0012] According to the application, preferably, the pH of the GO nanosheet aqueous dispersion ranges from 4 to 10.

[0013] According to the application, preferably, the base oil is one or a mixture of two or more of dimethyl silicone oil, liquid paraffin, pentaerythritol oleate, and trimethylolpropane oleate.

[0014] According to the application, preferably, the polymer surfactant is one or a mixture of two or more of aminopropyl-terminated polydimethylsiloxane and aminopropyl-bis-terminated polydimethylsiloxane.

[0015] More preferably, the weight average molecular weight Mw of the aminopropyl-terminated polydimethylsiloxane is 1000. W

[0016] More preferably, the weight average molecular weight Mw of the aminopropyl-bis-terminated polydimethylsiloxane is 1000-50000. W

[0017] According to the application, preferably, the concentration of the polymer surfactant ranges from 1 to 20 mg / mL, and more preferably from 2 to 15 mg / mL.

[0018] According to the application, preferably, the volume ratio of the water phase to the oil phase is 3:7-7:3, and more preferably 4:7-2:1.

[0019] According to the application, preferably, the emulsion gel lubricant has a friction coefficient ≤0.06 when used as a lubricant in air.

[0020] According to the application, preferably, the emulsion gel lubricant has a friction coefficient ≤0.06 when used as a lubricant underwater.

[0021] According to the application, the preparation method of the above-mentioned malleable emulsion gel lubricant comprises the following steps:

[0022] The GO nanosheet is dispersed in water, the pH of the system is adjusted to 4-10 to obtain a GO nanosheet aqueous dispersion; the polymer surfactant is added to the base oil and ultrasonically dissolved to obtain a surfactant oil solution, the surfactant oil solution is poured into the GO nanosheet aqueous dispersion and uniformly mixed and dispersed, and the emulsion gel lubricant is obtained by standing.

[0023] According to the application, preferably, the reagent used for adjusting the pH of the system is an HCl or NaOH solution.

[0024] ​​According to the application, preferably, the surface active agent oil solution is poured into the GO nanosheet water dispersion liquid to be mixed and dispersed uniformly by vortex oscillation.

[0025] According to the application, a plastic emulsion gel lubricant is also provided, which is applicable to the lubrication of parts in underwater environments such as biological tissue engineering, deep-sea exploration, ship engineering, etc.

[0026] Further, the application of the above water / oil (W / O) emulsion gel system as a lubricant, especially as a plastic underwater lubricant, is also provided.

[0027] Principle of the application:

[0028] In the application, both the GO and the polymer surfactant have amphiphilic properties, and are adsorbed to the oil-water interface during the emulsification process to reduce the oil-water interfacial tension. Since the carboxyl groups on the surface of the GO are negatively charged, and the amino groups of the polymer surfactant are positively charged, the long-chain hydrophilic amino groups can be combined with the GO carboxyl groups through electrostatic interaction at the oil-water interface, and the hydrophobic chain ends can be combined with the adjacent polymer chain ends through hydrophobic interaction, winding, etc., thus playing the role of a bridge to connect two adjacent droplets together to form a droplet network, and binding the oil in the network structure to form a W / O emulsion gel.

[0029] Advantages of the application:

[0030] (1) The emulsion gel lubricant of the application is semi-solid, which is not prone to leakage and creep. The GO nanosheets are firmly adsorbed at the oil-water interface, and the base oil is fixed in the network structure formed by the droplets, avoiding the sedimentation of additives and the precipitation of oil.

[0031] (2) The gel lubricant of the application exhibits good stability, and no obvious demulsification and oil precipitation occurs after being placed at room temperature for more than 1 year.

[0032] (3) The emulsion gel lubricant of the application has excellent friction reduction and wear resistance, and when used as a lubricant in air, the friction coefficient is only 0.06, which is better than that of dimethyl silicone oil, and the wear volume is only 35% of that of the dimethyl silicone oil system.

[0033] (4) The emulsion gel lubricant of the application does not disperse in water and can firmly adhere to various substrates, has good underwater printing property, and can be shaped into various complex shapes in water.

[0034] (5) The emulsion gel lubricant of the application has excellent underwater lubricity, and when used as a lubricant under water, the friction coefficient is about 0.06, which does not significantly decay compared with that in air.

[0035] (6) The gel lubricant of the present application has excellent corrosion resistance. When it is coated on the surface of a stainless steel block and placed in water at 50 DEG C for 72 hours, no obvious corrosion phenomenon occurs. When it is coated on the surface of a stainless steel electrode and used in an electrochemical corrosion experiment, no corrosion current occurs in a 3.5wt% NaCl aqueous solution, indicating that no electrochemical corrosion occurs.

[0036] (7) The preparation method of the gel lubricant of the present application has few raw material components, simple preparation method, mild reaction condition and high preparation efficiency. The raw materials used are non-toxic and environmentally friendly, and easy to be industrialized. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The graph of the change of the friction coefficient of the gel lubricant prepared in Example 1 and dimethyl silicone oil in air with time.

[0038] Figure 2 The graph of the wear volume of the gel lubricant prepared in Example 1 and dimethyl silicone oil in air.

[0039] Figure 3 The comparison graph of the friction coefficient of the gel lubricant prepared in Example 1 in air and in water.

[0040] Figure 4 The comparison graph of the surface morphology of the steel block coated with the gel lubricant prepared in Example 1 and the pure steel block and the water corrosion steel block.

[0041] Figure 5 The polarization curve of the stainless steel electrode coated with the gel lubricant prepared in Example 1 and the uncoated electrode.

[0042] Figure 6 The 3D printing and shaping graph of the gel lubricant prepared in Example 1 in water. DETAILED DESCRIPTION

[0043] The present application is a plastic emulsion gel lubricant, which is a water-in-oil emulsion gel system, comprising an aqueous phase, an oil phase and an emulsifier, wherein the aqueous phase is a graphene oxide (GO) nanosheet water dispersion, the oil phase is base oil, and the emulsifier is a polymer surfactant.

[0044] In the present application, the GO is preferably monodisperse GO nanosheets, and the GO has amphiphilicity and can be adsorbed to the oil-water interface during the emulsification process to reduce the oil-water interfacial tension.

[0045] The concentration of the GO nanosheet aqueous dispersion has an important influence on the formation of the emulsion gel. If the concentration of the GO nanosheet aqueous dispersion is low, for example, lower than 0.15 mg / mL, it will be difficult to form the emulsion gel. Therefore, in one or more preferred embodiments, the concentration of the GO nanosheet aqueous dispersion ranges from 0.15 to 1.5 mg / mL, and further preferably from 0.3 to 1 mg / mL.

[0046] According to the present application, the pH range of the GO nanosheet aqueous dispersion has an important influence on the formation of the emulsion gel. If the system is too alkaline or too acidic, for example, the pH value is greater than 10 or less than 3, it will be difficult to form the emulsion gel. Therefore, in one or more preferred embodiments, the pH range of the GO nanosheet aqueous dispersion ranges from 4 to 10.

[0047] According to the present application, the solubility of the polymer surfactant in the base oil has an important influence on the formation of the emulsion gel. If the base oil cannot dissolve the polymer surfactant, for example, the aminopropyl double-terminated polydimethylsiloxane is not miscible with PAO6, it will be difficult to form the emulsion gel. Therefore, in one or more preferred embodiments, the base oil is one or a mixture of two or more of dimethyl silicone oil, liquid paraffin, pentaerythritol oleate, and trimethylolpropane oleate.

[0048] According to the present application, the polymer surfactant is an amphiphilic polymer, and preferably an amphiphilic polymer containing a positively charged group, so that the long-chain hydrophilic amino group of the polymer can be combined with the carboxyl group of the GO through electrostatic interaction at the oil-water interface.

[0049] In one or more embodiments, the polymer surfactant is one or a mixture of two or more of aminopropyl-terminated polydimethylsiloxane and aminopropyl double-terminated polydimethylsiloxane.

[0050] Preferably, the weight average molecular weight Mw of the aminopropyl-terminated polydimethylsiloxane is W = 1000.

[0051] Preferably, the weight average molecular weight Mw of the aminopropyl double-terminated polydimethylsiloxane is W = 1000-50000, such as 1000, 3000, 27000, and 50000.

[0052] According to the present application, the concentration of the polymer surfactant has an important influence on the formation of the emulsion gel. If the concentration of the polymer surfactant is too low, for example, lower than 1 mg / mL, it will be difficult to form the emulsion gel.

[0053] In one or more embodiments, the concentration of the polymer surfactant ranges from 1 to 20 mg / mL, and preferably from 2 to 15 mg / mL, for example, 2 mg / mL, 5 mg / mL, and 10 mg / mL.

[0054] According to the present application, the volume ratio of the water phase to the oil phase has an important influence on the formation of the emulsion gel, and it is difficult to form the emulsion gel when the volume ratio of the water phase is too low or too high, for example, less than 3:7 or more than 7:3.

[0055] In one or more embodiments, the volume ratio of the water phase to the oil phase is 3:7-7:3, and further preferably 4:7-2:1.

[0056] The emulsion gel lubricant of the present application is semi-solid, has excellent friction-reducing and anti-wear properties, and has a friction coefficient of ≤0.06 when used as a lubricant in air and a friction coefficient of ≤0.06 when used as a lubricant underwater.

[0057] According to the present application, a preparation method of the above-mentioned malleable emulsion gel lubricant is also provided, comprising the following steps:

[0058] The GO nanosheets are dispersed in water, the pH value of the system is adjusted to 4-10 to obtain a GO nanosheet water dispersion; the polymeric surfactant is added to the base oil and ultrasonically dissolved to obtain a surfactant oil solution, the surfactant oil solution is poured into the GO nanosheet water dispersion and uniformly mixed and dispersed, and the system is left to stand to form a gel, thereby obtaining the emulsion gel lubricant.

[0059] In one or more embodiments, the reagent used for adjusting the pH value of the system is an HCl or NaOH solution.

[0060] In one or more embodiments, the method for uniformly mixing and dispersing the surfactant oil solution into the GO nanosheet water dispersion is vortex oscillation.

[0061] According to the present application, the above-mentioned water / oil (W / O) emulsion gel system is used as a lubricant, in particular as a malleable underwater lubricant. Not only can the problems of loss and creep faced by lubricating oil be effectively avoided, but also the lubricating oil exhibits better protection than lubricating oil due to the semi-solid nature of the gel, thereby slowing down the corrosion of equipment. The amphiphilic substances in the emulsion gel can interact with the lubricating oil to form a stable emulsion structure, thereby reducing the possibility of oil separation and additive sedimentation during long-term storage. In addition, the water in the emulsion gel lubricant can play a cooling role, effectively reducing the heat generated during friction. Therefore, the malleable emulsion gel lubricant of the present application has good application prospects in the lubrication of parts in underwater environments such as biological tissue engineering, deep-sea exploration, ship engineering, etc.

[0062] The present application will be further described below by means of specific examples and in conjunction with the accompanying drawings, but is not limited thereto.

[0063] The raw materials used in the examples are all conventional raw materials, and are commercially available products.

[0064] Example 1

[0065] A method of preparing a shapeable emulsion gel lubricant comprising the steps of:

[0066] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl double-terminated polydimethylsiloxane (M W = 27000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 10 mg / mL. The ammonia propyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, ensuring that the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0067] Example 2

[0068] A method of preparing a shapeable emulsion gel lubricant comprising the steps of:

[0069] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl double-terminated polydimethylsiloxane (M W = 27000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 10 mg / mL. The ammonia propyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, ensuring that the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0070] Example 3

[0071] A method of preparing a shapeable emulsion gel lubricant comprising the steps of:

[0072] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl double-terminated polydimethylsiloxane (M W = 27000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 10 mg / mL. The ammonia propyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, ensuring that the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0073] Example 4

[0074] A method of preparing a shapeable emulsion gel lubricant comprising the steps of:

[0075] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl double-terminated polydimethylsiloxane (M W = 27000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 2 mg / mL. The ammonia propyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, and the volume ratio of water / oil in the final system was ensured to be 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0076] Example 5

[0077] A method for preparing a shapeable emulsion gel lubricant, comprising the following steps:

[0078] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl-terminated polydimethylsiloxane (M W = 1000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 10 mg / mL. The ammonia propyl-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, and the volume ratio of water / oil in the final system was ensured to be 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0079] Example 6

[0080] A method for preparing a shapeable emulsion gel lubricant, comprising the following steps:

[0081] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl double-terminated polydimethylsiloxane (M W = 27000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 10 mg / mL. The ammonia propyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, and the volume ratio of water / oil in the final system was ensured to be 3 / 7. After vortex vibration for 10 min, the system was left to stand until gelation.

[0082] Example 7

[0083] A method for preparing a shapeable emulsion gel lubricant, comprising the following steps:

[0084] Single-layer GO nanosheets were dispersed in water to prepare a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. Ammonia propyl double-terminated polydimethylsiloxane (M W=27000) was dissolved in Pentaerythritol Oleate to make an oil solution with a concentration of 10 mg / mL. The oil solution of the amine terminated polydimethylsiloxane was poured into the GO dispersion, ensuring the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0085] Comparative Example 1

[0086] Monolayer GO nanosheets were dispersed in water to make a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 12 using a 1 mol / L NaOH solution. The amine terminated polydimethylsiloxane (M W =27000) was dissolved in Pentaerythritol Oleate to make an oil solution with a concentration of 10 mg / mL. The oil solution of the amine terminated polydimethylsiloxane was poured into the GO dispersion, ensuring the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0087] Comparative Example 2

[0088] Monolayer GO nanosheets were dispersed in water to make a uniform dispersion with a concentration of 0.1 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. The amine terminated polydimethylsiloxane (M W =27000) was dissolved in Pentaerythritol Oleate to make an oil solution with a concentration of 10 mg / mL. The oil solution of the amine terminated polydimethylsiloxane was poured into the GO dispersion, ensuring the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0089] Comparative Example 3

[0090] Monolayer GO nanosheets were dispersed in water to make a uniform dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using a 1 mol / L NaOH solution. The amine terminated polydimethylsiloxane (M W =27000) was dissolved in Pentaerythritol Oleate to make an oil solution with a concentration of 10 mg / mL. The oil solution of the amine terminated polydimethylsiloxane was poured into the GO dispersion, ensuring the volume ratio of water / oil in the final system was 1 / 1. After vortex vibration for 10 min, the system was left to stand until gelation.

[0091] Comparative Example 4

[0092] Monolayer GO nanosheets were dispersed in water to prepare a homogeneous dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using 1 mol / L NaOH solution. Aminopropyl-terminated polydimethylsiloxane (M... W =27000) was dissolved in dimethyl silicone oil to prepare an oil solution with a concentration of 10 mg / mL. The aminopropyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, ensuring that the final water / oil volume ratio was 2 / 8. After vortexing for 10 min and allowing to stand, no gel formed. This indicates that a too small volume proportion of the aqueous phase is detrimental to emulsion gel formation.

[0093] Comparative Example 5

[0094] Monolayer GO nanosheets were dispersed in water to prepare a homogeneous dispersion with a concentration of 0.3 mg / mL. The pH of the dispersion was adjusted to 4 using 1 mol / L NaOH solution. Aminopropyl-terminated polydimethylsiloxane (M... W =27000) was dissolved in PAO6 (polya-olefin) to prepare an oil solution with a concentration of 10 mg / mL. The aminopropyl double-terminated polydimethylsiloxane oil solution was poured into the GO dispersion, ensuring that the final water / oil volume ratio was 1:1. After vortexing for 10 min and allowing to stand, no gel formed. This indicates that an inappropriate choice of base oil will hinder the formation of the emulsion gel.

[0095] Experimental Example 1

[0096] The air and underwater tribological properties of the emulsion gel lubricant prepared in Example 1 were characterized, such as... Figure 1 , Figure 2 , Figure 3 As shown. Figure 1 , 2 The results showed that the emulsion gel had a better lubricating effect than dimethyl silicone oil, effectively reducing the coefficient of friction of the system to 0.06 and the wear volume to about 35% of that of the dimethyl silicone oil lubricated system.

[0097] Figure 3 The graph shows a comparison of the friction coefficients of the emulsion gel in water and air. The results indicate that the gel can still maintain excellent lubrication performance in water, and the friction coefficient does not change significantly compared with that in air.

[0098] Experimental Example 2

[0099] The corrosion resistance of the emulsion gel lubricant prepared in Example 1 was tested, such as... Figure 4 , Figure 5 As shown.

[0100] Figure 4The surface photos and SEM images of the stainless steel block coated with the emulsion gel after being placed in water at 50℃ for 72h show that the surface of the uncoated steel block is seriously corroded, while the surface of the steel block coated with the gel is similar to that of the pure steel block and no obvious corrosion occurs.

[0101] Figure 5 The polarization curve of the stainless steel electrode in the aqueous solution of NaCl with a concentration of 3.5wt% shows that no corrosion current occurs for the stainless steel electrode coated with the emulsion gel, further proving that the emulsion gel has excellent corrosion resistance.

[0102] Test Example 3

[0103] The emulsion gel prepared in Example 1 was used as ink for 3D printing in water, as shown in Figure 6 .

[0104] Figure 6 The pattern printed in water using the emulsion gel as ink can be seen to maintain the integrity of the shape, indicating that the emulsion gel has underwater printability.

Claims

1. A malleable emulsion gel lubricant characterized by, The lubricant is a W / O emulsion gel system, comprising an aqueous phase, an oil phase and an emulsifier, the aqueous phase is a GO nanosheet aqueous dispersion, the oil phase is a base oil, and the emulsifier is a polymer surfactant; The concentration of the GO nanosheet aqueous dispersion ranges from 0.15 to 1.5 mg / mL, and the pH of the GO nanosheet aqueous dispersion ranges from 4 to 10; the base oil is one or a mixture of two or more of dimethyl silicone oil, liquid paraffin, pentaerythritol oleate, and trimethylolpropane oleate; the polymer surfactant is one or a mixture of two or more of aminopropyl-terminated polydimethylsiloxane and aminopropyl-bis-terminated polydimethylsiloxane; the concentration of the polymer surfactant ranges from 1 to 20 mg / mL, the volume ratio of the water phase to the oil phase ranges from 3:7 to 7:3, the weight average molecular weight M W of the aminopropyl-terminated polydimethylsiloxane is 1000, and the weight average molecular weight M W of the aminopropyl-bis-terminated polydimethylsiloxane ranges from 1000 to 50000.

2. The malleable emulsion gel lubricant of claim 1, wherein, The emulsion gel lubricant has a friction coefficient ≤0.06 when used as a lubricant in air.

3. The malleable emulsion gel lubricant of claim 1, wherein, The emulsion gel lubricant has a friction coefficient ≤0.06 when used as a lubricant underwater.

4. A method for preparing the plastic emulsion gel lubricant according to any one of claims 1-3, comprising the following steps: Dispersing GO nanosheets in water, adjusting the pH value of the system to 4-10 to obtain a GO nanosheet aqueous dispersion; adding a polymer surfactant to a base oil, ultrasonically dissolving to obtain a surfactant oil solution, pouring the surfactant oil solution into the GO nanosheet aqueous dispersion, mixing and uniformly dispersing, and standing to form a gel, thereby obtaining the emulsion gel lubricant.

5. Application of the plastic emulsion gel lubricant according to any one of claims 1-3 as a component lubricant in the field of deep-sea ocean exploration and ship engineering.

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