A heavy-duty vehicle gear oil based on shape memory polymer and its preparation method and application

Abstract

The present invention relates to the technical field of gear oil, and more specifically, to a heavy-duty vehicle gear oil based on shape memory polymer, and a preparation method and application thereof. The heavy-duty vehicle gear oil, by weight, comprises the following raw materials: 50-80 parts of base oil, 5-10 parts of shape memory polyurethane, 5-10 parts of extreme pressure anti-wear agent, 1-3 parts of antioxidant, and 1-3 parts of metal corrosion inhibitor; the gear oil prepared by the present invention has excellent anti-wear performance, load-bearing capacity, and anti-foaming performance, can effectively prevent erosion or peeling of the gear surface, and solves the problems of poor lubricity of existing heavy-duty gear oil, easy oxidation and degradation at high temperature, and reduced fluidity at low temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of gear oils, and more specifically, to a heavy-duty vehicle gear oil based on a shape memory macromolecular polymer, and a preparation method and application thereof. Background Art

[0002] Gear oil is a lubricant specially used for lubricating gears and transmission systems. Its main function is to reduce friction, wear and noise between gears, and provide good cooling and sealing effects. According to the load size, gear oil can be divided into heavy-load gear oil, medium-load gear oil, and light-load gear oil. Heavy-load gear oil is suitable for transmission systems that bear high loads and impact loads. These gear systems usually bear large forces and torques. In particular, during the meshing transmission process of hyperbolic gears, the pressure transmitted is higher and the relative slip speed is faster, which generates very high instantaneous temperatures. Therefore, heavy-load gear oil is required to have excellent anti-wear performance, extreme pressure performance and durability to ensure the stable operation and long-term reliability of the transmission system.

[0003] The Chinese patent with publication number CN108441296A discloses a heavy-duty gear oil for vehicles, which includes the following substances in parts by weight: 90-96 parts by weight of base oil, 0.5-2 parts by weight of pour point depressant, 3-5 parts by weight of additives, 0.1-0.5 parts by weight of anti-wear agent, 0.3-0.8 parts by weight of high-temperature antioxidant, and 0.001-0.003 parts by weight of defoaming agent. This technical solution alleviates the oxidation rate of the oil due to being always at high temperature, and also strengthens its anti-wear properties so that the temperature of the gear oil will not be too high due to friction between gears, and has great protection for the gears. However, the base oil in this technical solution is mainly mineral oil, and mineral oil has the disadvantages of poor low-temperature performance and short service life.

[0004] The Chinese patent with the publication number CN113087744A discloses the preparation of a non-sulfur-phosphorus organic tungsten additive and a heavy-duty gear oil containing the additive. The technical solution adds the non-sulfur-phosphorus organic tungsten additive to a base oil composited with poly-α-olefin and diisooctyl sebacate, and mixes it with polymethacrylate, high molecular weight polyisobutylene succinimide, p-, p-diisooctyl diphenylamine, methylene bis-dibutyl dithiocarbamate, bismuth cyclohexane acid and methylbenzotriazole to obtain a heavy-duty gear oil. The heavy-duty gear oil of the technical solution has outstanding extreme pressure anti-wear, high temperature anti-oxidation, deposit inhibition and corrosion resistance. However, it uses poly-α-olefin and diisooctyl sebacate as base oil, and may have the problem of decreased fluidity at extremely low temperatures. Summary of the invention

[0005] The purpose of the present invention is to provide a heavy-duty vehicle gear oil based on a shape memory polymer, and a preparation method and application thereof, so as to solve the problems of poor lubricity of existing heavy-duty gear oils, easy oxidation and degradation at high temperatures, reduced fluidity at low temperatures, etc. The prepared gear oil has excellent anti-wear performance, load-bearing capacity, and anti-foaming properties, and can effectively prevent erosion or peeling of the gear surface. The gear oil of the present invention is suitable for lubrication of drive shafts of various types of automobiles, drive axles of engineering machinery, and some gearbox gears, especially for lubrication of vehicles equipped with hyperbolic gears, and is suitable for high-speed / low-torque, low-speed / high-torque, or high-speed / impact load occasions.

[0006] The first aspect of the present invention provides a heavy-duty vehicle gear oil based on a shape memory polymer, wherein the raw materials include, by weight: 50-80 parts of base oil, 5-10 parts of shape memory polyurethane, 5-10 parts of extreme pressure anti-wear agent, 1-3 parts of antioxidant, and 1-3 parts of metal corrosion inhibitor;

[0007] The preparation method of the shape memory polyurethane comprises the following steps:

[0008] S1, reacting diisocyanate, hyperbranched hydroxyl-terminated polyester polyol, dibutyltin dilaurate and acetone at 75-80° C. for 30-40 min to obtain intermediate 1;

[0009] S2, adding trimethylolpropane and acetone to the intermediate 1 under heat preservation conditions to react for 1-2 hours to obtain the intermediate 2;

[0010] S3. Under heat preservation conditions, add terminal hydroxyl polyether diol, dibutyltin dilaurate and acetone to the intermediate 2 and react for 1-2 hours to obtain.

[0011] The gear system of a heavy-load vehicle is subjected to tremendous force and friction, so the heavy-load gear lubricant needs to have better lubricity than medium-load gear oil and light-load gear oil. The inventors have found that the shape memory polyurethane prepared by the present invention can improve the lubricity of gear oil when used in gear oil. The inventors speculate that this is because the shape memory polyurethane prepared by the present invention is a multi-arm shape memory polyurethane, which forms a lubricating film with a large protection area when the gear oil contacts the gear surface, thereby reducing the surface friction coefficient and improving the lubricity. It was unexpectedly discovered that when hyperbranched terminal hydroxyl polyester polyol is used for end-capping in S1 and terminal hydroxyl polyether diol is used for end-capping in S3, the resulting shape memory polyurethane is used in gear oil so that the gear oil has more excellent lubricity.

[0012] Preferably, the mass ratio of diisocyanate, hyperbranched hydroxyl-terminated polyester polyol, dibutyltin dilaurate and acetone in S1 is 1:(4-6):(0.001-0.002):(2-4), preferably 1:5:0.0015:3.

[0013] Preferably, the mass ratio of intermediate 1, trimethylolpropane and acetone in S2 is 1:(0.5-0.7):(2-4), preferably 1:0.6:3.

[0014] Preferably, the mass ratio of intermediate 2, terminal hydroxyl polyether diol, dibutyltin dilaurate and acetone in S3 is 1:(0.1-0.3):(0.001-0.002):(2-4), preferably 1:0.2:0.0015:3.

[0015] Preferably, the hyperbranched hydroxyl-terminated polyester polyol has a hydroxyl number of 10-12 mol and a hydroxyl value of 500-530 mgKOH / g, preferably a hydroxyl number of 10-12 mol and a hydroxyl value of 520 mgKOH / g.

[0016] Preferably, the diisocyanate is selected from at least one of hexamethylene diisocyanate, trimethyl hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, toluene diisocyanate and p-phenylene diisocyanate, preferably trimethyl hexamethylene diisocyanate.

[0017] Preferably, the hydroxy-terminated polyether diol is polyethylene glycol, and the polyethylene glycol includes polyethylene glycol with a molecular weight of 1000 and polyethylene glycol with a molecular weight of 6000, and the mass ratio is (2-3):1.

[0018] During the meshing transmission process of a hyperbolic gear vehicle, the pressure transmitted is very high, and the relative slip speed can reach 400m / min, thus generating a very high instantaneous temperature, which causes the gear oil film to be destroyed and the gear oil to peel off on the gear surface. The inventor unexpectedly discovered during the experiment that when the number of hydroxyl groups of the hyperbranched hydroxyl-terminated polyester polyol is 10-12mol, and the hydroxyl value is 500-530mgKOH / g; the hydroxyl-terminated polyether diol is polyethylene glycol, and the polyethylene glycol includes polyethylene glycol with a molecular weight of 1000 and polyethylene glycol with a molecular weight of 6000, the obtained shape memory polyurethane makes the gear oil FZG test, the failure level can reach level 12, which can prevent the gear oil film from being destroyed, and prevent the oil film from being eroded or peeled off. The inventors speculate that this is because the shape memory polyurethane prepared under such conditions can, on the one hand, adjust its shape according to temperature changes in a high temperature environment, thereby filling the tiny cracks or pores formed by the gear oil on the gear surface, improving the adhesion of the gear oil on the gear surface, and preventing it from peeling off. On the other hand, the shape memory polyurethane prepared under such conditions itself has good high temperature resistance, can maintain the stability of its physical and chemical properties at high temperatures, and avoid the influence of high temperature.

[0019] Preferably, the base oil comprises poly-α-olefin and synthetic ester, and the mass ratio of the poly-α-olefin to the synthetic ester is 1:3-5.

[0020] Preferably, the poly-α-olefin comprises a 100° C. kinematic viscosity of 35 to 45 mm 2 / s, a viscosity index of 150 to 160, a pour point of -42 to -36°C poly-a-olefin A and a kinematic viscosity of 18 to 25 mm at 100°C 2 / s, a poly-alpha-olefin B having a viscosity index of 140 to 150 and a pour point of -50 to -40°C.

[0021] Preferably, the poly-α-olefin comprises a polyolefin having a kinematic viscosity of 40 mm at 100°C. 2 / s, a viscosity index of 154, a pour point of -40°C polyalphaolefin A and a kinematic viscosity of 20 mm at 100°C 2 / s, a poly alpha-olefin B with a viscosity index of 147 and a pour point of -45°C.

[0022] Preferably, the mass ratio of the poly-α-olefin A to the poly-α-olefin B is 1:(2-3), preferably 1:2.

[0023] Preferably, the synthetic ester comprises a first synthetic ester and a second synthetic ester; the mass ratio of the first synthetic ester to the second synthetic ester is (1-3):(1-3), preferably 1:2.

[0024] Preferably, the first synthetic ester is a product prepared from a mixed alcohol of pentanediol and dipentaerythritol and a mixed acid of adipic acid, azelaic acid, stearic acid and oleic acid; and the second synthetic ester is diisooctyl sebacate.

[0025] Preferably, the preparation method of the first synthetic ester comprises the following steps: taking pentanediol and dipentaerythritol, mixing them to obtain a mixed alcohol; taking adipic acid, azelaic acid, stearic acid and oleic acid, mixing them to obtain a mixed acid; mixing the mixed alcohol and the mixed acid, using xylene as a solvent, performing a reflux reaction, and performing reduced pressure distillation to obtain the first synthetic ester.

[0026] Preferably, the reflux reaction temperature is 180-220° C., and the reflux reaction time is 15-18 h.

[0027] Preferably, the mass ratio of pentanediol to dipentaerythritol is (2-4):1, preferably 3:1.

[0028] Preferably, the mass ratio of adipic acid, azelaic acid, stearic acid and oleic acid is (1-3):(1-2):(2-4):(1-2), preferably 2:1:3:1.

[0029] Preferably, the molar ratio of the mixed acid (carboxyl) to the mixed alcohol (hydroxyl) is 1:(1.1-1.3).

[0030] The inventors have found that when a specific base oil is used, that is, the base oil includes poly-α-olefin and synthetic ester, the poly-α-olefin includes a 100° C. kinematic viscosity of 35 to 45 mm 2 / s, a viscosity index of 150 to 160, a pour point of -42 to -36°C poly-a-olefin A and a kinematic viscosity of 18 to 25 mm at 100°C 2 / s, a poly α-olefin B with a viscosity index of 140 to 150 and a pour point of -50 to -40°C; the synthetic ester includes a first synthetic ester and a second synthetic ester; the first synthetic ester is a product prepared from a mixed alcohol of pentanediol and dipentaerythritol and a mixed acid of adipic acid, azelaic acid, stearic acid and oleic acid; when the second synthetic ester is diisooctyl sebacate, they can coordinate with each other, and the obtained gear oil not only has excellent high-temperature stability, but also can avoid oxidation and degradation of the gear oil when used in hyperbolic gear vehicles, and has good low-temperature stability and still has good fluidity at low temperatures (-45°C).

[0031] Preferably, the extreme pressure anti-wear agent is a modified nanomaterial; the nanomaterial is selected from at least one of nano boron nitride, nano tungsten oxide, nano lanthanum oxide, nano silicon dioxide, and nano titanium dioxide.

[0032] Preferably, the nanomaterial is selected from a combination of nano boron nitride and nano lanthanum oxide.

[0033] Preferably, the particle size of the nano boron nitride is 40-60 nm, preferably 50 nm.

[0034] Preferably, the crystal nucleus size of the nano-lanthanum oxide is 30-50 nm, preferably 40 nm.

[0035] Preferably, the mass ratio of the nano-boron nitride to the nano-lanthanum oxide is (5-7):(0.2-0.5), preferably 6:0.4.

[0036] Preferably, the method for preparing the modified nanomaterial comprises the following steps:

[0037] Step 1, dissolving the nanomaterial in an ethanol aqueous solution (80 vol%), and ultrasonicating for 20-30 min to obtain a suspension;

[0038] Step 2: adding butyl titanate to the suspension, reacting at 40-60° C. for 15-18 hours, filtering, washing and drying to obtain a boron nitride / nano-lanthanum oxide / titanium dioxide composite material;

[0039] Step 3: Under a nitrogen protective atmosphere, dissolve the boron nitride / nano-lanthanum oxide / titanium dioxide composite material, palmitic acid, stearic acid, and azobisisobutyronitrile in an ethanol aqueous solution (80 vol%), react at 50-70° C. for 8-12 h, filter, wash, and dry to obtain.

[0040] Preferably, in step 1, the ratio of the nanomaterial to the ethanol aqueous solution is 1 g: 0.5-1 L, preferably 1 g: 0.8 L.

[0041] Preferably, in step 2, the volume ratio of the suspension to butyl titanate is (4-10):1, preferably 8:1.

[0042] Preferably, in step 3, the ratio of boron nitride / nano-lanthanum oxide / titanium dioxide composite material, palmitic acid, stearic acid, azobisisobutyronitrile, and ethanol aqueous solution is 1g: 0.3-0.5g: 0.1-0.3g: 0.005-0.01g: 5-8mL, preferably 1g: 0.4g: 0.2g: 0.01g: 6mL.

[0043] The inventors found in the process of exploration that the lubricity, high temperature resistance and low temperature resistance of gear oil can be improved by using specific shape memory polyurethane and base oil, but the load-bearing capacity is poor. In order to solve the above problems, the present invention introduces modified nanomaterials, and unexpectedly finds that when the nanomaterials are selected from the combination of nano boron nitride and nano lanthanum oxide, and the modified nanomaterials prepared by a specific preparation method not only make the gear oil have excellent load-bearing capacity, but also improve its anti-foaming property. The inventors speculate that it is because the modified nanomaterials of the present invention contain boron nitride / nano lanthanum oxide / titanium dioxide particles, and the three of them work together to improve the oil film strength, improve the load-bearing capacity of the gear oil, and avoid severe wear of the gear transmission parts due to harsh working conditions such as high temperature and high load; at the same time, the modified nanomaterials prepared by the present invention are core-shell structures with excellent surface activity, which can be adsorbed on the liquid-gas interface, reduce surface tension, and prevent the formation and diffusion of bubbles.

[0044] Preferably, the antioxidant is selected from at least one of phenolic antioxidants, amine antioxidants, phenolic ester antioxidants and thiophenolic ester antioxidants, preferably a phenolic antioxidant.

[0045] Preferably, the phenolic antioxidant is selected from at least one of 2,6-di-tert-butyl-p-cresol and 4,4-thiobis(2-tert-butyl-6-methylphenol).

[0046] Preferably, the metal corrosion inhibitor is selected from at least one of benzotriazole derivatives, thiazole derivatives and thiadiazole derivatives, preferably a benzotriazole derivative.

[0047] The second aspect of the present invention provides a method for preparing heavy-duty vehicle gear oil based on shape memory polymer, comprising the following steps: mixing base oil, shape memory polyurethane, extreme pressure anti-wear agent, antioxidant, and metal corrosion inhibitor uniformly by weight.

[0048] The third aspect of the present invention provides a use of a heavy-duty vehicle gear oil based on a shape memory polymer in a driving shaft of an automobile, a driving axle of an engineering machinery, a gearbox gear, or a curved gear vehicle.

[0049] Beneficial effects:

[0050] 1. The shape memory polyurethane prepared by the present invention can improve the lubricity of gear oil when used in gear oil. When hyperbranched hydroxyl-terminated polyester polyol is used for end-capping in S1 and hydroxyl-terminated polyether diol is used for end-capping in S3, the obtained shape memory polyurethane is used in gear oil to make the gear oil have better lubricity.

[0051] 2. In the present invention, when the number of hydroxyl groups of the hyperbranched hydroxyl-terminated polyester polyol is 10-12 mol, and the hydroxyl value is 500-530 mgKOH / g; the hydroxyl-terminated polyether diol is polyethylene glycol, and the polyethylene glycol includes polyethylene glycol with a molecular weight of 1000 and polyethylene glycol with a molecular weight of 6000, the obtained shape memory polyurethane can achieve a failure level of 12 in the gear oil FZG test, thereby preventing the gear oil film from being destroyed and preventing the oil film from being eroded or peeling off.

[0052] 3. The present invention adopts a specific base oil, that is, the base oil includes poly-α-olefin and synthetic ester, which can coordinate with each other. The obtained gear oil not only has excellent high-temperature stability, but also can avoid oxidation and degradation of the gear oil when used in hyperbolic gear vehicles. It also has good low-temperature stability and still has good fluidity at low temperatures (-45°C).

[0053] 4. In the present invention, when the nano material is selected from a combination of nano boron nitride and nano lanthanum oxide and is prepared by a specific preparation method, the modified nano material not only makes the gear oil have excellent load-bearing capacity, but also improves its anti-foaming property. DETAILED DESCRIPTION

[0054] In order to better explain the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the examples in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other implementation methods obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. The experimental methods in the following embodiments, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can be obtained from commercial channels.

[0055] Example 1

[0056] Example 1 provides a heavy-duty vehicle gear oil based on a shape memory polymer, wherein the raw materials include, by weight: 70 parts of base oil, 8 parts of shape memory polyurethane, 8 parts of extreme pressure anti-wear agent, 2 parts of antioxidant, and 2 parts of metal corrosion inhibitor;

[0057] The preparation method of the shape memory polyurethane comprises the following steps:

[0058] S1, reacting diisocyanate, hyperbranched hydroxyl-terminated polyester polyol, dibutyltin dilaurate and acetone at 80° C. for 35 min to obtain intermediate 1;

[0059] S2, under heat preservation conditions, add trimethylolpropane and acetone to the intermediate 1 and react for 1.5 hours to obtain the intermediate 2;

[0060] S3. Under heat preservation conditions, add terminal hydroxyl polyether diol, dibutyltin dilaurate and acetone to the intermediate 2 and react for 1.5 hours to obtain.

[0061] The mass ratio of diisocyanate, hyperbranched hydroxyl-terminated polyester polyol, dibutyltin dilaurate and acetone in S1 is 1:5:0.0015:3.

[0062] The mass ratio of intermediate 1, trimethylolpropane and acetone in S2 is 1:0.6:3.

[0063] The mass ratio of intermediate 2, terminal hydroxyl polyether diol, dibutyltin dilaurate and acetone in S3 is 1:0.2:0.0015:3.

[0064] The hyperbranched hydroxyl-terminated polyester polyol has a hydroxyl number of 11±1 mol and a hydroxyl value of 520 mgKOH / g, and is purchased from Wuhan Hyperbranched Resin Technology Co., Ltd., model: H202.

[0065] The diisocyanate is trimethylhexamethylene diisocyanate.

[0066] The terminal hydroxyl polyether diol is polyethylene glycol, and the polyethylene glycol includes polyethylene glycol with a molecular weight of 1000 and polyethylene glycol with a molecular weight of 6000, and the mass ratio is 2:1.

[0067] The base oil comprises poly-α-olefin and synthetic ester, and the mass ratio of the poly-α-olefin to the synthetic ester is 1:4.

[0068] The poly-alpha-olefin comprises a 100° C. kinematic viscosity of 40 mm 2 / s, a viscosity index of 154, a pour point of -40°C polyalphaolefin A and a kinematic viscosity of 20 mm at 100°C 2 / s, a poly-α-olefin B with a viscosity index of 147 and a pour point of -45°C; poly-α-olefin A and poly-α-olefin B were purchased from Shanghai Nano Lubrication Technology Co., Ltd., and the models were SinoSyn40 and SinoSyn20, respectively.

[0069] The mass ratio of the poly-α-olefin A to the poly-α-olefin B is 1:2.

[0070] The synthetic ester comprises a first synthetic ester and a second synthetic ester; the mass ratio of the first synthetic ester to the second synthetic ester is 1:2.

[0071] The first synthetic ester is a product prepared from a mixed alcohol of pentanediol and dipentaerythritol and a mixed acid of adipic acid, azelaic acid, stearic acid and oleic acid; the second synthetic ester is diisooctyl sebacate, which was purchased from Shandong Ruijie New Materials Co., Ltd.

[0072] The preparation method of the first synthetic ester comprises the following steps: taking pentanediol and dipentaerythritol, mixing them to obtain a mixed alcohol; taking adipic acid, azelaic acid, stearic acid and oleic acid, mixing them to obtain a mixed acid; mixing the mixed alcohol and the mixed acid, using xylene as a solvent, performing a reflux reaction, and performing reduced pressure distillation to obtain the first synthetic ester.

[0073] The reflux reaction temperature is 200° C., and the reflux reaction time is 18 h.

[0074] The mass ratio of pentanediol to dipentaerythritol is 3:1.

[0075] The mass ratio of the adipic acid, azelaic acid, stearic acid and oleic acid is 2:1:3:1.

[0076] The molar ratio of the mixed acid (carboxyl) to the mixed alcohol (hydroxyl) is 1:1.2.

[0077] The extreme pressure anti-wear agent is a modified nano material; the nano material is selected from the combination of nano boron nitride and nano lanthanum oxide.

[0078] The particle size of the nano boron nitride is 50 nm and it is purchased from Beijing Dekedaojin Technology Co., Ltd., model DK-BN-001.

[0079] The nano-lanthanum oxide has a crystal core particle size of 40 nm and is purchased from Beijing Dekedaojin Technology Co., Ltd., model DK-La2O3-40.

[0080] The mass ratio of the nano boron nitride to the nano lanthanum oxide is 6:0.4.

[0081] The preparation method of the modified nanomaterial comprises the following steps:

[0082] Step 1, dissolving the nanomaterial in an ethanol aqueous solution (80 vol%), and ultrasonicating for 30 min to obtain a suspension;

[0083] Step 2: adding butyl titanate to the suspension, reacting at 50° C. for 16 hours, filtering, washing and drying to obtain a boron nitride / nano-lanthanum oxide / titanium dioxide composite material;

[0084] Step 3: Under a nitrogen protective atmosphere, dissolve the boron nitride / nano-lanthanum oxide / titanium dioxide composite material, palmitic acid, stearic acid, and azobisisobutyronitrile in an ethanol aqueous solution (80 vol%), react at 60° C. for 10 h, filter, wash, and dry to obtain.

[0085] In step 1, the ratio of nanomaterial to ethanol aqueous solution is 1 g: 0.8 L.

[0086] In step 2, the volume ratio of the suspension to butyl titanate is 8:1.

[0087] In step 3, the ratio of the boron nitride / nano-lanthanum oxide / titanium dioxide composite material, palmitic acid, stearic acid, azobisisobutyronitrile, and ethanol aqueous solution is 1 g: 0.4 g: 0.2 g: 0.01 g: 6 mL.

[0088] The antioxidant is a phenolic antioxidant, and the phenolic antioxidant is 2,6-di-tert-butyl-p-cresol.

[0089] The metal corrosion inhibitor is a benzotriazole derivative purchased from Suzhou Xingchangrun Chemical Co., Ltd., model: T551.

[0090] A method for preparing heavy-duty vehicle gear oil based on shape memory high molecular polymer comprises the following steps: uniformly mixing base oil, shape memory polyurethane, extreme pressure anti-wear agent, antioxidant and metal corrosion inhibitor by weight.

[0091] The invention discloses an application of a heavy-duty vehicle gear oil based on a shape memory macromolecular polymer in a driving shaft of an automobile, a driving axle of an engineering machinery, a gearbox gear or a curved gear vehicle.

[0092] Example 2

[0093] Example 2 provides a heavy-duty vehicle gear oil based on a shape memory polymer, a preparation method and an application thereof. Its specific implementation method is the same as that of Example 1, except that, by mass, the raw materials include: 50 parts of base oil, 5 parts of shape memory polyurethane, 5 parts of extreme pressure anti-wear agent, 1 part of antioxidant, and 1 part of metal corrosion inhibitor.

[0094] Example 3

[0095] Example 3 provides a heavy-duty vehicle gear oil based on a shape memory polymer, a preparation method and an application thereof. The specific implementation method is the same as that of Example 1, except that, by mass, the raw materials include: 80 parts of base oil, 10 parts of shape memory polyurethane, 10 parts of extreme pressure anti-wear agent, 3 parts of antioxidant, and 3 parts of metal corrosion inhibitor.

[0096] Comparative Example 1

[0097] Comparative Example 1 provides a heavy-duty vehicle gear oil based on a shape memory polymer, and a preparation method and application thereof. The specific implementation manner is the same as that of Example 1, except that the preparation method of the shape memory polyurethane comprises the following steps:

[0098] S1, reacting diisocyanate, hydroxyl-terminated polyether diol, dibutyltin dilaurate and acetone at 80° C. for 35 min to obtain intermediate 1;

[0099] S2, under heat preservation conditions, add trimethylolpropane and acetone to the intermediate 1 and react for 1.5 hours to obtain the intermediate 2;

[0100] S3. Under heat preservation conditions, add hyperbranched hydroxyl-terminated polyester polyol, dibutyltin dilaurate and acetone to the intermediate 2 and react for 1.5 hours to obtain.

[0101] Comparative Example 2

[0102] Comparative Example 2 provides a heavy-duty vehicle gear oil based on a shape memory polymer, a preparation method and an application thereof. Its specific implementation method is the same as that of Example 1, except that the hyperbranched terminal hydroxyl polyester polyol has a hydroxyl number of 6±1 mol and a hydroxyl value of 550 mgKOH / g, and is purchased from Wuhan Hyperbranched Resin Technology Co., Ltd., model: H201.

[0103] Comparative Example 3

[0104] Comparative Example 3 provides a heavy-duty vehicle gear oil based on a shape memory polymer, and a preparation method and application thereof. The specific implementation method is the same as that of Example 1, except that the polyethylene glycol has a molecular weight of 1000.

[0105] Comparative Example 4

[0106] Comparative Example 4 provides a heavy-duty vehicle gear oil based on a shape memory polymer and a preparation method and application thereof. The specific implementation method is the same as that of Example 1, except that the kinematic viscosity of the α-olefin B at 100° C. is 9.9 mm 2 / s, viscosity index is 148, pour point is -52°C, purchased from Shanghai Nak Lubrication Technology Co., Ltd., model: SinoSyn10.

[0107] Comparative Example 5

[0108] Comparative Example 5 provides a heavy-duty vehicle gear oil based on a shape memory polymer, and a preparation method and application thereof. Its specific implementation method is the same as Example 1, except that the first synthetic ester is trimethylolpropane oleate, purchased from Shandong Ruijie New Materials Co., Ltd., model: TMPTO-A.

[0109] Comparative Example 6

[0110] Comparative Example 6 provides a heavy-duty vehicle gear oil based on a shape memory polymer, and a preparation method and application thereof. Its specific implementation method is the same as Example 1, except that the second synthetic ester is trimethylolpropane oleate, purchased from Shandong Ruijie New Materials Co., Ltd., model: TMPTO-A.

[0111] Comparative Example 7

[0112] Comparative Example 7 provides a heavy-duty vehicle gear oil based on shape memory polymer, and its preparation method and application. Its specific implementation method is the same as Example 1, except that the nano-lanthanum oxide is replaced by nano-tungsten oxide. The particle size of the nano-tungsten oxide is 40 nm and is purchased from Beijing Dekedaojin Technology Co., Ltd.

[0113] Comparative Example 8

[0114] Comparative Example 8 provides a heavy-duty vehicle gear oil based on a shape memory polymer, a preparation method and an application thereof. Its specific implementation method is the same as that of Example 1, except that the preparation method of the modified nanomaterial comprises the following steps: under a nitrogen protective atmosphere, dissolving the nanomaterial, palmitic acid, stearic acid and azobisisobutyronitrile in an ethanol aqueous solution (80 vol%), reacting at 60°C for 10 hours, filtering, washing and drying.

[0115] The ratio of the nano material, palmitic acid, stearic acid, azobisisobutyronitrile and ethanol aqueous solution is 1g: 0.4g: 0.2g: 0.01g: 6mL.

[0116] Performance test: The heavy-duty vehicle gear oils of Examples 1-3 and Comparative Examples 1-8 were tested according to the items in Table 1 and Table 2:

[0117] Test results:

[0118] Table 1 Performance test results of heavy-duty vehicle gear oils of Examples 1-3 and Comparative Examples 1-2

[0119]

[0120]

[0121] Table 2 Performance test results of heavy-duty vehicle gear oils of Comparative Examples 3-8

[0122]

[0123]

[0124] It can be seen from Table 1 and Table 2 that the wear resistance and FZG test performance of the heavy-duty gear oil obtained in Comparative Examples 1-3 are lower than those in Example 1 due to the different shape memory polyurethanes prepared.

[0125] Due to the different base oils, the sintering load and flash point of the heavy-duty gear oil obtained in Comparative Examples 4-6 are lower than those in Example 1.

[0126] Due to the different modified nanomaterials, the maximum non-seizure load and anti-foaming performance of the heavy-duty gear oil obtained in Comparative Examples 7-8 are lower than those in Example 1.

[0127] The above description is only a specific embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformation made by the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A heavy-duty vehicle gear oil based on shape memory polymer, characterized in that: The raw materials include, by weight: 50-80 parts of base oil, 5-10 parts of shape memory polyurethane, 5-10 parts of extreme pressure anti-wear agent, 1-3 parts of antioxidant, and 1-3 parts of metal corrosion inhibitor; The preparation method of the shape memory polyurethane comprises the following steps: S1, reacting diisocyanate, hyperbranched hydroxyl-terminated polyester polyol, dibutyltin dilaurate and acetone at 75-80° C. for 30-40 min to obtain intermediate 1; S2, adding trimethylolpropane and acetone to the intermediate 1 under heat preservation conditions to react for 1-2 hours to obtain the intermediate 2; S3, under heat preservation conditions, add hydroxyl-terminated polyether diol, dibutyltin dilaurate and acetone to the intermediate 2 and react for 1-2 hours to obtain; The extreme pressure anti-wear agent is a modified nano material; the preparation method of the modified nano material comprises the following steps: Step 1, dissolving the nanomaterial in an ethanol aqueous solution, and ultrasonicating for 20-30 minutes to obtain a suspension, wherein the nanomaterial is selected from a combination of nano boron nitride and nano lanthanum oxide; Step 2: adding butyl titanate to the suspension, reacting at 40-60° C. for 15-18 hours, filtering, washing and drying to obtain a boron nitride / nano-lanthanum oxide / titanium dioxide composite material; Step 3: Under a nitrogen protective atmosphere, dissolve the boron nitride / nano-lanthanum oxide / titanium dioxide composite material, palmitic acid, stearic acid and azobisisobutyronitrile in an ethanol aqueous solution, react at 50-70° C. for 8-12 hours, filter, wash and dry to obtain.

2. The heavy-duty vehicle gear oil according to claim 1, characterized in that: The hyperbranched hydroxyl-terminated polyester polyol has a hydroxyl number of 10-12 mol and a hydroxyl value of 500-530 mgKOH / g.

3. The heavy-duty vehicle gear oil according to claim 1, characterized in that: The terminal hydroxyl polyether diol is polyethylene glycol, and the polyethylene glycol includes polyethylene glycol with a molecular weight of 1000 and polyethylene glycol with a molecular weight of 6000, and the mass ratio is (2-3):

1.

4. The heavy-duty vehicle gear oil according to any one of claims 1 to 3, characterized in that: The base oil comprises poly-α-olefin and synthetic ester, and the mass ratio of the poly-α-olefin to the synthetic ester is 1:(3-5).

5. The heavy-duty vehicle gear oil according to claim 4, characterized in that: The poly-alpha-olefin comprises a 100° C. kinematic viscosity of 35 to 45 mm 2 / s, a viscosity index of 150 to 160, a pour point of -42 to -36°C, and a kinematic viscosity of 18 to 25 mm at 100°C. 2 / s, a poly-alpha-olefin B having a viscosity index of 140 to 150 and a pour point of -50 to -40°C.

6. The heavy-duty vehicle gear oil according to claim 5, characterized in that: The synthetic ester includes a first synthetic ester and a second synthetic ester; the mass ratio of the first synthetic ester to the second synthetic ester is (1-3): (1-3).

7. The heavy-duty vehicle gear oil according to claim 6, characterized in that: The first synthetic ester is a product prepared from a mixed alcohol of pentanediol and dipentaerythritol and a mixed acid of adipic acid, azelaic acid, stearic acid and oleic acid; and the second synthetic ester is diisooctyl sebacate.

8. A method for preparing a heavy-duty vehicle gear oil according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: mixing base oil, shape memory polyurethane, extreme pressure anti-wear agent, antioxidant and metal corrosion inhibitor uniformly according to parts by mass.

9. Use of the heavy-duty vehicle gear oil according to any one of claims 1 to 7 in a driving shaft of an automobile or a driving axle of an engineering machinery or a gearbox gear.

10. Use of the heavy-duty vehicle gear oil according to any one of claims 1 to 7 in curved gear vehicles.

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