Modified nanocellulose for rolling oil and its application

Abstract

The present invention provides a modified nanocellulose for rolling oil and its application. The modified nanocellulose for rolling oil is nanocellulose modified with hydrophobic groups; the hydrophobic groups include any one or a combination of at least two of fatty acids, fatty acid anhydrides, fatty acid esters, phosphates, or silane coupling agents. The hydrophobic group modification of the nanocellulose of the present invention forms a strong network structure within the rolling oil film through hydrogen bonding interactions between multiple hydroxyl groups on the nanocellulose surface, thereby effectively enhancing the strength of the lubricating oil film. Furthermore, the fatty acid, fatty acid anhydride, phosphate, or silane groups introduced into the nanocellulose further enhance the boundary and extreme pressure lubrication properties of the rolling oil, providing sufficient lubrication in the roll gap area and significantly reducing friction during use.

Description

Technical Field

[0001] The invention belongs to the technical field of rolling oil, and particularly relates to modified nanocellulose for rolling oil and application thereof. Background Art

[0002] Ultra-high-strength steel, due to its excellent comprehensive mechanical properties, is finding increasing application in the automotive, construction, marine, defense, and aerospace industries. In recent years, steel manufacturers worldwide have begun to gradually add, expand, or upgrade high-strength steel production capacity to meet growing global market demand. Ultra-high-strength steel boasts a tensile strength (Rm(σb)) >700MPa and a yield strength (Re(σs)) >550MPa. In addition to the production process, the rolling oil used in the cold rolling process is also crucial, placing higher demands on the lubricant used in production.

[0003] CN109628200A discloses an environmentally friendly rolling oil for high-strength steel and its preparation method. The environmentally friendly rolling oil comprises the following components: base oil, palm oil, trimethylolpropane cocoate, an emulsifier, a rust inhibitor, and an antioxidant. The preparation method comprises the following steps: mixing the base oil, palm oil, and trimethylolpropane cocoate, adding the emulsifier, heating the mixture, adding the rust inhibitor and the antioxidant, and performing vacuum degassing to obtain the environmentally friendly rolling oil. However, the rolling oil uses a large amount of trans-octadecenoic acid as the base oil. When producing ultra-high-strength steel, particularly products with ultra-high tensile strength such as boron steel, the high temperatures generated can cause unsaturated bonds to break, resulting in unstable lubrication performance.

[0004] CN110408456A discloses a cold rolling oil suitable for use in single-stand reversible rolling mills producing high-strength steel products. The rolling oil consists of base oils A, B, and C, an emulsifier, an extrusion anti-wear agent, an antioxidant, and a rust inhibitor. This cold rolling oil provides the lubrication required for high-strength steel production while significantly reducing oil smoke and irritating odors emitted during production. However, the oil utilizes a large amount of phosphate esters to provide extreme pressure lubrication, which places higher demands on environmental protection measures. Improper discharge could potentially cause water pollution.

[0005] In order to solve the shortcomings of the existing ultra-high strength steel cold rolling oil technology, it is urgently necessary to develop a rolling oil with high oil film strength, good lubrication, low friction and more environmentally friendly components to meet the needs of the ultra-high strength steel process. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a modified nanocellulose for rolling oil and its application. The modified nanocellulose of the present invention has the characteristics of high mechanical strength, high tensile strength, high elastic modulus, high toughness, etc., and can effectively enhance the oil film strength and lubricating properties of the rolling oil after being used in rolling oil. It not only has a good cleaning effect on dirt on metal surfaces, but also has strong rust prevention ability, and is more environmentally friendly and safe. To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a modified nanocellulose for rolling oil, wherein the modified nanocellulose for rolling oil is a nanocellulose modified with a hydrophobic group;

[0008] The molecular structure of the hydrophobic group-modified nanocellulose is

[0009]

[0010] wherein R is selected from a hydrophobic group, n<300;

[0011] The hydrophobic group is derived from any one of fatty acid, fatty acid anhydride, fatty acid ester, phosphate ester or silane coupling agent, or a combination of at least two thereof.

[0012] The nanocellulose of the present invention is modified with hydrophobic groups, and a strong network structure can be formed inside the rolling oil film through the hydrogen bond interaction of multiple hydroxyl groups on the surface of the nanocellulose, thereby effectively enhancing the strength of the lubricating oil film. At the same time, the fatty acid, fatty acid anhydride, phosphate or silane group introduced into the nanocellulose can further improve the boundary and extreme pressure lubrication performance of the rolling oil, provide sufficient lubrication in the roll gap area, and greatly reduce the friction during its use.

[0013] Preferably, the nanocellulose is derived from any one of cellulose nanofibers, bacterial nanocellulose or cellulose nanocrystals, or a combination of at least two of them.

[0014] In the present invention, by controlling the aspect ratio of nanocellulose, the modified nanocellulose can have the characteristics of high mechanical strength, high tensile strength, high elastic modulus and high toughness, and can further improve its lubricating performance after being used in rolling oil.

[0015] Preferably, the hydrophobic group modification method includes any one of esterification / acetylation modification, graft copolymerization modification, and silane coupling agent modification.

[0016] Preferably, the esterification / acetylation modification comprises using fatty acids and / or fatty acid anhydrides to undergo a nucleophilic substitution reaction with hydroxyl groups in the nanocellulose.

[0017] Preferably, the fatty acid comprises a C2-C30 fatty acid, wherein C2-C30 means that C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29 or C30, etc. can be selected.

[0018] Preferably, the fatty acid anhydride comprises C2-C30 fatty acid anhydride, wherein C2-C30 means that C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29 or C30, etc. can be selected.

[0019] Preferably, the fatty acid comprises any one of acetic acid, propionic acid, n-butyric acid, isobutyric acid, n-pentanoic acid, neopentanoic acid, hexanoic acid, nonanoic acid, isononanoic acid, octanoic acid, heptanoic acid, n-decanoic acid, neodecanoic acid, lauric acid, palmitic acid, oleic acid or stearic acid, or a combination of at least two thereof.

[0020] Preferably, the fatty acid anhydride comprises any one of acetic anhydride, propionic anhydride, n-butyric anhydride, isobutyric anhydride, n-valeric anhydride, neopentanoic anhydride, hexanoic anhydride, nonanoic anhydride, isononanoic anhydride, octanoic anhydride, heptanoic anhydride, n-decanoic anhydride, neodecanoic anhydride, lauric anhydride, palmitic anhydride, oleic anhydride or stearic anhydride, or a combination of at least two thereof.

[0021] Preferably, the graft copolymerization modification comprises grafting fatty acid ester and / or phosphate ester onto the surface of nanocellulose via covalent bonds.

[0022] Preferably, the fatty acid ester includes any one of C2-C30 fatty acid monoester, C2-C30 fatty acid diester, C2-C30 fatty acid triester or C2-C30 fatty acid tetraester, or a combination of at least two thereof, and the above C2-C30 can independently be selected from C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29 or C30, etc.

[0023] Preferably, the phosphate ester includes C8-C16 phosphate ester, wherein C8-C16 means that C8, C9, C10, C11, C12, C13, C14, C15 or C16, etc. can be selected.

[0024] Preferably, the silane coupling agent modification comprises combining hydroxyl groups generated by hydrolysis of the silane coupling agent with hydroxyl groups of the nanocellulose.

[0025] Preferably, the silane coupling agent includes any one of aminosilane, epoxysilane, vinylsilane or methacryloxysilane, or a combination of at least two thereof.

[0026] Preferably, the modified nanocellulose has a diameter of ≤100 nm (for example, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm or 90 nm, etc.), and a length of 1-5 μm (for example, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm or 5 μm, etc.).

[0027] Other specific point values ​​within the above numerical range can be selected and will not be described in detail here.

[0028] In a second aspect, the present invention provides a use of the modified nanocellulose for rolling oil as described in the first aspect in metal rolling oil.

[0029] In a third aspect, the present invention provides an environmentally friendly ultra-high strength steel rolling oil, wherein the components of the environmentally friendly ultra-high strength steel rolling oil include, by weight, 0.1-2 parts of modified nanocellulose for rolling oil as described in the first aspect, 20-55 parts of natural oils and fats, 20-55 parts of synthetic esters, 0.5-2.5 parts of emulsifiers, 0.5-3 parts of extreme pressure agents, 0.1-5 parts of cosolvents, 1-3 parts of antioxidants, 1-3 parts of rust inhibitors, and 0.3-1 parts of pH regulators.

[0030] The environmentally friendly ultra-high-strength steel rolling oil of the present invention is added with modified nanocellulose. The rolling oil not only has a good oil film thickness, but also the oil film formed in the roll gap area is not easy to break, thereby improving the lubrication ability. It also has a lower rolling force during the rolling process, which is more energy-efficient. In addition, it can also provide a higher rolling speed during the rolling process, thereby improving production capacity. The steel plate surface produced by using the rolling oil added with modified nanocellulose of the present invention is cleaner, and the plate surface reflectivity is higher, which can effectively improve the product quality; less iron powder and oil sludge are generated during the rolling process, thereby effectively reducing the emission of hazardous waste and operating costs of the enterprise.

[0031] The amount of modified nanocellulose used in the environmentally friendly ultra-high strength steel rolling oil of the present invention can be 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts or 1.8 parts, etc.;

[0032] The amount of natural oil added can be 22 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or 52 parts;

[0033] The amount of the synthetic ester added can be 22 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or 52 parts, etc.;

[0034] The amount of the emulsifier added can be 0.7 parts, 0.9 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts or 2.4 parts, etc.;

[0035] The addition amount of the extreme pressure agent can be 0.7 parts, 0.9 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.7 parts or 2.9 parts, etc.;

[0036] The amount of the cosolvent added can be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.;

[0037] The amount of the antioxidant added can be 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts or 2.8 parts, etc.;

[0038] The amount of the rust inhibitor added can be 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts or 2.8 parts, etc.;

[0039] The amount of the pH adjuster added may be 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part.

[0040] Other specific point values ​​within the above numerical range can be selected and will not be described in detail here.

[0041] Preferably, the natural oil comprises any one of soybean oil, palm oil, rapeseed oil or palm kernel oil, or a combination of at least two thereof.

[0042] Preferably, the synthetic ester comprises any one or a combination of at least two of pentaerythritol coconut oil / oleic acid mixed tetraester, trimethylolpropane monoester, trimethylolpropane coconut oil triester, neopentyl glycol monoester or polyethylene glycol coconut oil diester.

[0043] Preferably, the emulsifier includes any one of fatty alcohol polyoxyethylene ether, cetostearyl alcohol, cetostearyl alcohol ether, ethoxylated cetostearyl alcohol or isomeric tridecanol polyoxyethylene ether, or a combination of at least two thereof.

[0044] Preferably, the extreme pressure agent comprises any one or a combination of at least two of amine phosphate, alkylamine phosphate, oleyl alcohol phosphate, isotridecanol phosphate, dodecyl alcohol ether phosphate or C12-14 tertiary alkylamine phosphate sec-butyl and isobutyl mixed ester.

[0045] Preferably, the cosolvent includes any one of diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, propylene glycol propyl ether, hexylene glycol or propylene glycol, or a combination of at least two thereof.

[0046] Preferably, the antioxidant comprises 4,4-methylenebis(2,6-di-tert-butylphenol) and / or 2,6-di-tert-butyl-a-dimethylamino-p-cresol.

[0047] Preferably, the rust inhibitor comprises any one or a combination of at least two of methylbenzotriazole, benzotriazole or benzotriazole derivatives.

[0048] Preferably, the pH adjuster comprises isooctanoic acid and / or dicyclohexylamine.

[0049] In a fourth aspect, the present invention provides a method for preparing the environmentally friendly ultra-high strength steel rolling oil as described in the third aspect, the preparation method comprising:

[0050] (1) heating the natural oil to 80-92° C. (e.g., 80° C., 82° C., 85° C., 87° C., 89° C., 90° C., or 91° C.), then adding an antioxidant and a rust inhibitor, and mixing until homogeneous;

[0051] (2) adding the synthetic ester to the homogenized mixture obtained in step (1) and mixing uniformly;

[0052] (3) After cooling to 40-50° C. (for example, 41° C., 42° C., 43° C., 44° C., 45° C., 46° C., 47° C., 48° C., or 49° C.), the modified nanocellulose, emulsifier, extreme pressure agent, cosolvent, and pH regulator for rolling oil as described in the first aspect are added, and the mixture is stirred and homogenized.

[0053] Other specific point values ​​within the above numerical range can be selected and will not be described in detail here.

[0054] In a fifth aspect, the present invention provides a method for using the environmentally friendly ultra-high strength steel rolling oil as described in the third aspect, the method comprising: during a rolling process, dispersing the environmentally friendly ultra-high strength steel rolling oil in deionized water to form an emulsion system, and rolling in the form of an emulsion, wherein the emulsion system has a pH of 4-5 (for example, the pH may be 4, 4.5, or 5, etc.), an electrical conductivity of less than 300 μs / cm (for example, it may be 50 μs / cm, 100 μs / cm, 150 μs / cm, 200 μs / cm, or 250 μs / cm, etc.), and a particle size of 5-10 μm (for example, it may be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm, etc.);

[0055] The mass concentration of the environmentally friendly ultra-high strength steel rolling oil in the emulsion system is 1%-3% (for example, it can be 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5% or 2.8%, etc.).

[0056] Other specific point values ​​within the above numerical range can be selected and will not be described in detail here.

[0057] Compared with the prior art, the present invention has at least the following beneficial effects:

[0058] (1) The nanocellulose of the present invention is modified with hydrophobic groups, and a strong network structure can be formed inside the rolling oil film through the hydrogen bond interaction of multiple hydroxyl groups on the surface of the nanocellulose, thereby effectively enhancing the strength of the lubricating oil film. At the same time, the fatty acid, fatty acid anhydride, phosphate or silane group introduced into the nanocellulose can further improve the boundary and extreme pressure lubrication performance of the rolling oil, provide sufficient lubrication in the roll gap area, and greatly reduce the friction during its use.

[0059] (2) The environmentally friendly ultra-high strength steel rolling oil of the present invention is added with modified nanocellulose. The rolling oil not only has a good oil film thickness, but also the oil film formed in the roll gap area is not easy to break, thereby improving the lubrication ability. In addition, the rolling oil has a lower rolling force during the rolling process, which is more energy-efficient. In addition, a higher rolling speed can be provided during the rolling process, thereby improving production capacity. The steel plate surface produced by using the rolling oil added with modified nanocellulose of the present invention is cleaner, and the plate surface reflectivity is higher, which can effectively improve the product quality. Less iron powder and less oil sludge are generated during the rolling process, thereby effectively reducing the emission of hazardous waste and operating costs of the enterprise.

[0060] (3) The preparation method of the environmentally friendly ultra-high strength steel rolling oil provided by the present invention is simple, easy to use, and easy to industrially apply. DETAILED DESCRIPTION

[0061] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0062] The nanocellulose used in the examples of the present invention was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.

[0063] The lauric acid diglyceride was purchased from Hubei Xinhongli Chemical Co., Ltd.

[0064] The dipalmitoylglycerol was purchased from Shanghai Hewu Biotechnology Co., Ltd.

[0065] The methacryloxypropyltrimethoxysilane was purchased from Hubei Jusheng Technology Co., Ltd.

[0066] Other raw materials can be used as long as they are purchased from regular dealers.

[0067] Example 1

[0068] This embodiment provides a modified nanocellulose for rolling oil. The modified nanocellulose for rolling oil is obtained by a nucleophilic substitution reaction between lauric acid and the hydroxyl group of nanocellulose. The structure of the modified nanocellulose for rolling oil is as follows (average degree of polymerization is 200):

[0069]

[0070] The diameter of the modified nanocellulose is 70±20 nm and the length is 3±1 μm.

[0071] Example 2

[0072] This embodiment provides a modified nanocellulose for rolling oil, wherein the nanocellulose is modified by C13 phosphate. The structure of the modified nanocellulose for rolling oil is as follows (average degree of polymerization 150):

[0073]

[0074] The diameter of the modified nanocellulose is 80±20 nm and the length is 3±1 μm.

[0075] Example 3

[0076] This embodiment provides a modified nanocellulose for rolling oil. The modified nanocellulose for rolling oil is obtained by combining hydroxyl groups generated by hydrolysis of γ-methacryloxypropyltrimethoxysilane (KH570) with hydroxyl groups of nanocellulose. The structure of the modified nanocellulose for rolling oil is as follows (average degree of polymerization is 100):

[0077]

[0078] The nanocellulose has a diameter of 70±20 nm and a length of 3±1 μm.

[0079] Examples 4-9

[0080] This example provides six types of modified nanocellulose for rolling oil. The modified nanocellulose differs from that in Example 1 only in the hydrophobic groups. The hydrophobic modification groups are shown in Table 1.

[0081] Table 1

[0082]

[0083] Application Example 1

[0084] In this embodiment, an environmentally friendly ultra-high strength steel rolling oil is provided. The components of the environmentally friendly ultra-high strength steel rolling oil include, by weight: 1.5 parts of modified nanocellulose for rolling oil prepared in Example 1, 40 parts of natural oils and fats (including 20 parts of palm oil and 20 parts of soybean oil), 48.5 parts of synthetic esters (including 23.5 parts of trimethylolpropane monoester and 25 parts of trimethylolpropane coconut oil triester), 1.5 parts of emulsifier (fatty acid polyoxyethylene ether AEO-9), 2 parts of extreme pressure agent (ammonium phosphate), 2.5 parts of cosolvent (propylene glycol), 1.5 parts of antioxidant [4,4-methylenebis(2,6-di-tert-butylphenol)], 2 parts of rust inhibitor (benzotriazole), and 0.5 part of pH adjuster (dicyclohexylamine).

[0085] The preparation method of the environmentally friendly ultra-high strength steel rolling oil is as follows:

[0086] (1) Heat the natural oil to 85°C, then add antioxidant and rust inhibitor, and mix homogeneously;

[0087] (2) adding the synthetic ester to the homogenized mixture obtained in step (1) and mixing uniformly;

[0088] (3) After cooling to 45° C., modified nanocellulose, an emulsifier, an extreme pressure agent, a cosolvent, and a pH regulator for rolling oil are added, and the mixture is stirred and homogenized.

[0089] Application Example 2-9

[0090] In this embodiment, eight environmentally friendly ultra-high strength steel rolling oils are provided. The difference between the environmentally friendly ultra-high strength steel rolling oils and Application Example 1 is only that the modified nanocellulose used for rolling oil is replaced by the modified nanocellulose used for rolling oil prepared in Examples 2-9 in equal amounts, and the other components and addition amounts remain unchanged. The preparation method refers to Application Example 1.

[0091] Comparative Application Example 1

[0092] This comparative application example provides an environmentally friendly ultra-high strength steel rolling oil. The difference between the environmentally friendly ultra-high strength steel rolling oil and Application Example 1 is that modified nanocellulose is not added for rolling oil, and the reduced amount is supplemented by the co-solvent. The remaining components and addition amounts remain unchanged. The preparation method refers to Application Example 1.

[0093] Comparative Application Example 2

[0094] This comparative application example provides an environmentally friendly ultra-high strength steel rolling oil. The difference between the environmentally friendly ultra-high strength steel rolling oil and Application Example 1 is only that the modified nanocellulose used for rolling oil is replaced by unmodified nanocellulose in equal amounts, and the other components and addition amounts remain unchanged. The preparation method refers to Application Example 1.

[0095] Comparative Application Example 3

[0096] This comparative application example provides an environmentally friendly ultra-high strength steel rolling oil. The difference between the environmentally friendly ultra-high strength steel rolling oil and application example 2 is that the modified nanocellulose used in the rolling oil is replaced by an equal amount of C13 phosphate (structure: ), the other components and addition amounts remain unchanged, and the preparation method refers to Application Example 1.

[0097] Test Example 1: Oil Film Thickness Evaluation

[0098] Test method: The samples of Application Examples 1-9, Comparative Application Examples 1-3, and commercially available samples were tested using an EHD ultra-thin oil film thickness tester at a rotation speed of 800 mm / s. The results are shown in Table 2.

[0099] Table 2

[0100]

[0101]

[0102] Test Example 2 Friction Performance Test

[0103] The samples of Application Examples 1-9, Comparative Application Examples 1-3 and commercially available samples were respectively measured for four-ball PB values ​​using a four-ball friction tester, and the RCP friction coefficient was measured using an RCP reciprocating friction tester;

[0104] (1) The four-ball PB value test method is carried out in accordance with GB / T12583-1998;

[0105] (2) The RCP friction coefficient test method involves applying 5 μL of sample to the surface of a steel ball. Under the specified conditions (225°C, 4.5 kg load), the steel ball is reciprocated on the steel plate for at least 40 cycles. The average friction coefficient of the second to fifth cycles is then taken as the RCP friction coefficient. The results are shown in Table 3.

[0106] Table 3

[0107]

[0108]

[0109] It can be seen from the test data in Table 2-3 that the ultra-high strength steel rolling oil described in Application Examples 1-9 of the present invention has a higher oil film thickness, a higher four-ball PB value and a lower RCP friction coefficient compared with commercially available products. The oil film thickness is all above 883 mm, the four-ball PB value is above 170 kgf, and the RCP friction coefficient is all lower than 0.068, indicating that the rolling oil of the present invention has strong wear resistance, reduces the probability of local large plastic deformation on the surface of the rolled material during rolling, thereby effectively alleviating the roller sticking phenomenon.

[0110] In comparative application example 1, when the modified nanocellulose of the present invention is not added to the rolling oil, the oil film thickness and the four-ball PB value are significantly lower, and the RCP friction coefficient is higher, indicating that the wear resistance of the rolling oil is significantly poor.

[0111] In comparative application example 2, when nanocellulose is not modified, its addition to rolling oil does not improve the wear resistance of the rolling oil.

[0112] In comparative application example 3, when conventional lubricating components were added to the rolling oil, its lubricating performance was not as good as that of the rolling oil sample with hydrophobically modified cellulose added.

[0113] The applicant declares that while the above-described embodiments illustrate the modified nanocellulose for rolling oil and its applications, the present invention is not limited to these embodiments, nor does it necessarily rely on them for implementation. Persons skilled in the art should understand that any improvements to the present invention, equivalent substitutions for raw materials in the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A modified nanocellulose for rolling oil, characterized in that The modified nanocellulose used for rolling oil is nanocellulose modified with hydrophobic groups; The molecular structure of the hydrophobic group-modified nanocellulose is ； wherein R is selected from a hydrophobic group, n<300; The modified nanocellulose has a diameter of 10-100 nm and a length of 1-4 μm; The hydrophobic group is derived from any one or a combination of at least two of fatty acids, fatty acid anhydrides, fatty acid esters, phosphates or silane coupling agents; The fatty acid comprises any one of acetic acid, propionic acid, n-butyric acid, isobutyric acid, n-pentanoic acid, neopentanoic acid, hexanoic acid, nonanoic acid, isononanoic acid, octanoic acid, heptanoic acid, n-decanoic acid, neodecanoic acid, lauric acid, palmitic acid, oleic acid or stearic acid, or a combination of at least two thereof; The fatty acid anhydride includes any one of acetic anhydride, propionic anhydride, n-butyric anhydride, isobutyric anhydride, n-valeric anhydride, pivalic anhydride, hexanoic anhydride, nonanoic anhydride, isononanoic anhydride, octanoic anhydride, heptanoic anhydride, n-decanoic anhydride, neodecanoic anhydride, lauric anhydride, palmitic anhydride, oleic anhydride or stearic anhydride, or a combination of at least two thereof; The fatty acid ester is diglyceryl laurate or diglyceryl palmitate; The phosphate ester includes C8-C16 phosphate; The silane coupling agent includes any one of epoxy silane, vinyl silane or methacryloxy silane, or a combination of at least two thereof.

2. The modified nanocellulose for rolling oil according to claim 1, characterized in that The nanocellulose is derived from any one of cellulose nanofibers, bacterial nanocellulose or cellulose nanocrystals, or a combination of at least two of them.

3. Use of the modified nanocellulose for rolling oil according to claim 1 or 2 in metal rolling oil.

4. An environmentally friendly ultra-high strength steel rolling oil, characterized in that: The components of the environmentally friendly ultra-high strength steel rolling oil include, by weight, 0.1-2 parts of the modified nanocellulose for rolling oil according to claim 1 or 2, 20-55 parts of natural oils and fats, 20-55 parts of synthetic esters, 0.5-2.5 parts of emulsifiers, 0.5-3 parts of extreme pressure agents, 0.1-5 parts of cosolvents, 1-3 parts of antioxidants, 1-3 parts of rust inhibitors, and 0.3-1 parts of pH regulators.

5. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The natural oil comprises any one of soybean oil, palm oil, rapeseed oil or palm kernel oil, or a combination of at least two of them.

6. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The synthetic ester includes any one of pentaerythritol coconut oil / oleic acid mixed acid tetraester, trimethylolpropane monoacid triester, trimethylolpropane coconut oil triester, neopentyl glycol monoacid diester or polyethylene glycol coconut oil diester, or a combination of at least two thereof.

7. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The emulsifier includes any one of fatty alcohol polyoxyethylene ether, cetostearyl alcohol, cetostearyl alcohol ether, ethoxylated cetostearyl alcohol or isomeric tridecanol polyoxyethylene ether, or a combination of at least two thereof.

8. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The extreme pressure agent includes any one of amine phosphate, alkylamine phosphate, oleyl alcohol phosphate, isotridecanol phosphate, lauryl alcohol ether phosphate or C12-14 tertiary alkylamine phosphate sec-butyl and isobutyl mixed ester or a combination of at least two thereof.

9. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The cosolvent includes any one of diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, propylene glycol propyl ether, hexylene glycol or propylene glycol, or a combination of at least two thereof.

10. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The antioxidant includes 4,4-methylenebis(2,6-di-tert-butylphenol) and / or 2,6-di-tert-butyl-a-dimethylamino-p-cresol.

11. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The rust inhibitor includes any one of methyl benzotriazole, benzotriazole or benzotriazole derivatives, or a combination of at least two thereof.

12. The environmentally friendly ultra-high strength steel rolling oil according to claim 4, characterized in that: The pH adjuster includes isooctanoic acid and / or dicyclohexylamine.

13. The method for preparing the environmentally friendly ultra-high strength steel rolling oil according to any one of claims 4 to 12, characterized in that: The preparation method comprises: (1) Heat the natural oil to 80-92°C, then add antioxidant and rust inhibitor and mix homogeneously; (2) adding the synthetic ester to the homogenized mixture obtained in step (1) and mixing uniformly; (3) After cooling to 40-50° C., the modified nanocellulose for rolling oil according to claim 1 or 2, an emulsifier, an extreme pressure agent, a cosolvent, and a pH adjuster are added, and the mixture is stirred and homogenized to obtain the product.

14. A method for using the environmentally friendly ultra-high strength steel rolling oil according to any one of claims 4 to 12, characterized in that: The method of use comprises: during the rolling process, dispersing the environmentally friendly ultra-high strength steel rolling oil in deionized water to form an emulsion system, and rolling in the form of the emulsion, wherein the emulsion system has a pH of 4-5, a conductivity of less than 300 μs / cm, and a particle size of 5-20 μm; The mass concentration of the environmentally friendly ultra-high strength steel rolling oil in the emulsion system is 1%-3%.

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