CN116836302A - Modified nanocellulose for rolling oil and application thereof - Google Patents

Abstract

The invention provides a modified nanocellulose for rolling oil and application thereof, wherein the modified nanocellulose for rolling oil is a nanocellulose modified by hydrophobic groups; the hydrophobic group comprises any one or a combination of at least two of fatty acid, fatty anhydride, fatty acid ester, phosphate or silane coupling agent. According to the nano-cellulose disclosed by the invention, through modification of the hydrophobic group, a firm network structure is formed in the rolling oil film through hydrogen bond interaction of a plurality of hydroxyl groups on the surface of the nano-cellulose, so that the strength of the lubricating oil film is effectively enhanced, and meanwhile, the fatty acid, fatty anhydride, phosphate or silane groups introduced by the nano-cellulose can further improve the rolling oil boundary and extreme pressure lubricating property, provide sufficient lubrication in a roll gap area and greatly reduce the friction force in use.

Description

A kind of modified nanocellulose for rolling oil and its application

Technical field

The invention belongs to the technical field of rolling oil, and specifically relates to a modified nanocellulose used in rolling oil and its application.

Background technique

Due to its excellent comprehensive mechanical properties, ultra-high strength steel is increasingly used in the automotive industry, construction industry, marine industry, defense industry, aerospace industry and other fields. In recent years, steel manufacturing companies around the world have begun to gradually add, expand or upgrade high-strength steel production capacity to meet the growing global market demand. The tensile strength Rm(σb)>700MPa and yield strength Re(σs)>550MPa of ultra-high-strength steel. In addition to the production process, the rolling oil in the cold rolling process is also extremely critical during its manufacturing process. The lubricating medium puts forward higher requirements.

CN109628200A discloses an environmentally friendly rolling oil for high-strength steel and a preparation method thereof. The components of this environmentally friendly rolling oil include: base oil, palm oil, trimethylolpropane cocoate, emulsifier, rust inhibitor, and antioxidant. The preparation method is as follows: mix base oil, palm oil and trimethylolpropane cocoate, add emulsifier to mix, then heat up, add anti-rust agent and antioxidant to mix, and vacuum defoaming to obtain environmentally friendly rolling oil. However, this rolling oil uses a large amount of trans-octadecenoic acid as the base oil. When producing ultra-high-strength steel, especially ultra-high tensile strength products such as boron steel, the high temperatures generated will cause unsaturated bonds. The chain is broken, resulting in unstable oil lubrication performance.

CN110408456A discloses a cold rolling oil suitable for single-stand reversible rolling mills to produce high-strength steel products. The rolling oil consists of base oils A, B, C and emulsifiers, extrusion anti-wear agents, antioxidants and anti-rust agents. Composed of cold rolling oil, this cold rolling oil has the lubrication properties required for high-strength steel production, and has the advantage of significantly reducing oil smoke and pungent odors emitted during production. However, it uses a large amount of phosphate ester to provide extreme pressure lubrication performance, which places higher requirements on the company's environmental protection. If it is discharged improperly, it may cause water resource pollution.

In order to solve the shortcomings of the existing ultra-high-strength steel cold-rolling oil technology, it is urgent 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. .

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is 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 lubrication performance of the rolling oil after being used in rolling oil. It not only has a good cleaning effect on the dirt on the metal surface, but also has strong anti-rust ability, and is more environmentally friendly and safe. To achieve this goal, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides a modified nanocellulose for rolling oil, where the modified nanocellulose for rolling oil is hydrophobic group-modified nanocellulose;

The molecular structure of the hydrophobic group-modified nanocellulose is

Where R is selected from hydrophobic groups, n<300;

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.

Through the modification of hydrophobic groups, the nanocellulose of the present invention can form a strong network structure inside the rolling oil film through the hydrogen bond interaction of multiple hydroxyl groups on the surface of the nanocellulose, thereby effectively enhancing the lubricating oil. Oil film strength, while the fatty acid, fatty acid anhydride, phosphate or silane group introduced by the nanocellulose can further improve the rolling oil boundary and extreme pressure lubrication performance, provide sufficient lubrication in the roll gap area, and greatly reduce its use time of friction.

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

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 be used for rolling oil after It can better improve its lubrication performance.

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

Preferably, the esterification/acetylation modification includes using fatty acids and/or fatty acid anhydrides to undergo nucleophilic substitution reactions with hydroxyl groups in the nanocellulose.

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

Preferably, the fatty acid anhydride includes 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 can be selected , C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29 or C30, etc.

Preferably, the fatty acids include acetic acid, propionic acid, n-butyric acid, isobutyric acid, n-valeric acid, pivalic acid, caproic acid, nonanoic acid, isononanoic acid, caprylic acid, heptanoic acid, n-decanoic acid, and neodecanoic acid. , any one or a combination of at least two of lauric acid, palmitic acid, oleic acid or stearic acid.

Preferably, the fatty acid anhydride includes acetic anhydride, propionic anhydride, n-butyric anhydride, isobutyric anhydride, n-valeric anhydride, pivalic anhydride, caproic anhydride, nonanoic anhydride, isononanoic anhydride, octanoic anhydride, heptanoic anhydride, n-decanoic anhydride, Any one or a combination of at least two of neodecanoic anhydride, lauric anhydride, palmitic anhydride, oleic anhydride or stearic anhydride.

Preferably, the graft copolymerization modification includes grafting fatty acid esters and/or phosphate esters onto the nanocellulose surface through covalent bonds.

Preferably, the fatty acid ester includes any one or a combination of at least two of C2-C30 fatty acid monoester, C2-C30 fatty acid diester, C2-C30 fatty acid triester or C2-C30 fatty acid tetraester, the above C2 -C30 can independently select 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.

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.

Preferably, the silane coupling agent modification includes combining hydroxyl groups generated by hydrolysis of the silane coupling agent with hydroxyl groups of nanocellulose.

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

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

Other specific point values within the above numerical range can be selected, and will not be described one by one here.

In a second aspect, the present invention provides an application of the modified nanocellulose for rolling oil as described in the first aspect in metal rolling oil.

In a third aspect, the present invention provides an environmentally friendly ultra-high-strength steel rolling oil. The components of the environmentally-friendly ultra-high-strength steel rolling oil include the rolling oil as described in the first aspect in parts by weight. Modified nanocellulose 0.1-2 parts, natural oil 20-55 parts, synthetic ester 20-55 parts, emulsifier 0.5-2.5 parts, extreme pressure agent 0.5-3 parts, co-solvent 0.1-5 parts, antioxidant 1-3 parts, 1-3 parts of rust inhibitor, 0.3-1 part of pH adjuster.

By adding modified nanocellulose to the environmentally friendly ultra-high-strength steel rolling oil of the present invention, 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, improves the lubrication ability, and can It has lower rolling force during the rolling process and is more energy-saving. In addition, it can also provide higher rolling speed during the rolling process and increase production capacity. The steel plates produced using the rolling oil added with modified nanocellulose of the present invention Products with a cleaner surface and higher surface reflectivity can effectively improve product quality; less iron powder and less sludge are produced during the rolling process, effectively reducing the company's hazardous waste emissions and operating costs.

The addition amount of the modified nanocellulose used in the rolling oil 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.;

The added amount of the natural oil can be 22 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or 52 parts, etc.;

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

The added amount of the emulsifier 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.;

The added amount of the extreme pressure agent can be 0.7 parts, 0.9 parts, 1 part, 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.;

The added amount of the co-solvent 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.;

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

The added amount of the anti-rust agent can be 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts or 2.8 parts, etc.;

The pH adjuster can be added in an amount of 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts or 1 part, etc.

Other specific point values within the above numerical range can be selected, and will not be described one by one here.

Preferably, the natural oil includes any one or a combination of at least two of soybean oil, palm oil, rapeseed oil or palm kernel oil.

Preferably, the synthetic ester includes pentaerythritol coconut oleic acid/oleic acid mixed acid tetraester, trimethylolpropane-monoic acid triester, trimethylolpropane coconut oleic acid triester, neopentyl glycol-monoic acid diester Or any one or a combination of at least two of polyethylene glycol coconut oleic acid diesters.

Preferably, the emulsifier includes any one of fatty alcohol polyoxyethylene ether, cetearyl alcohol, cetearyl alcohol ether, ethoxylated cetearyl alcohol or isomeric tridecanol polyoxyethylene ether. or a combination of at least two.

Preferably, the extreme pressure agent includes amine phosphate, alkylamine phosphate, oleyl alcohol phosphate, isotridecanol phosphate, tetradecanol ether phosphate or C12-14 tert-alkylamine phosphate sec-butyl Any one or a combination of at least two of the base and isobutyl mixed greases.

Preferably, the co-solvent includes any one or a combination of at least two of diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, propylene glycol propyl ether, hexylene glycol or propylene glycol.

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

Preferably, the rust inhibitor includes any one or a combination of at least two of methylbenzotriazole, benzotriazole or benzotriazole derivatives.

Preferably, the pH adjuster includes isooctanoic acid and/or dicyclohexylamine.

In a fourth aspect, the present invention provides a method for preparing environmentally friendly ultra-high-strength steel rolling oil as described in the third aspect. The preparation method includes:

(1) Heat the natural oil to 80-92°C (for example, it can be 80°C, 82°C, 85°C, 87°C, 89°C, 90°C or 91°C, etc.), then add antioxidants and anti-rust agents, and mix homogeneous;

(2) Add synthetic ester to the mixture obtained after homogenization in step (1), mix and homogenize;

(3) Cool the temperature to 40-50°C (for example, it can be 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C or 49°C, etc.) and then add the ingredients as described in the first aspect. It is obtained by mixing and homogenizing modified nanocellulose, emulsifier, extreme pressure agent, co-solvent and pH regulator of rolling oil.

Other specific point values within the above numerical range can be selected, and will not be described one by one here.

In the 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 includes: during the rolling process, rolling the environmentally-friendly ultra-high-strength steel. The oil is dispersed in deionized water to form an emulsion system, and rolling is performed in the form of an emulsion. The pH of the emulsion system is 4-5 (for example, the pH can be 4, 4.5 or 5, etc.), and the conductivity is <300 μs/ cm (for example, it can be 50μs/cm, 100μs/cm, 150μs/cm, 200μs/cm or 250μs/cm, etc.), and the particle size is 5-10μm (for example, it can be 5μm, 6μm, 7μm, 8μm, 9μm or 10μm, etc.) ;

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. ).

Other specific point values within the above numerical range can be selected, and will not be described one by one here.

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

(1) The nanocellulose of the present invention can form a strong network structure through the hydrogen bond interaction of multiple hydroxyl groups on the surface of the nanocellulose inside the rolling oil film through the modification of hydrophobic groups, thereby effectively strengthening the The strength of the lubricating oil film is improved. At the same time, the fatty acids, fatty acid anhydrides, phosphates or silane groups introduced by the nanocellulose can further improve the rolling oil boundary and extreme pressure lubrication properties, provide sufficient lubrication in the roll gap area, and greatly reduce The friction during its use.

(2) By adding modified nanocellulose to the environmentally friendly ultra-high-strength steel rolling oil of the present invention, 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, thus improving the lubrication ability. In addition, it has lower rolling force during the rolling process and is more energy-saving. In addition, it can also provide higher rolling speed during the rolling process and increase production capacity. It is produced by using the rolling oil added with modified nanocellulose of the present invention. The steel plate surface is cleaner and the plate surface reflectivity is higher, which can effectively improve the product quality; less iron powder and less sludge are produced during the rolling process, effectively reducing the company's hazardous waste emissions and operating costs.

(3) The environmentally friendly ultra-high-strength steel rolling oil provided by the present invention has a simple preparation method, is convenient to use, and is easy for industrial application.

Detailed ways

The technical solution of the present invention will be further described below through specific implementations. Those skilled in the art should understand that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

The nanocellulose used in the examples of the present invention was purchased from Shanghai McLean Biochemical Technology Co., Ltd.;

The lauric acid diglyceride was purchased from Hubei Xinhongli Chemical Co., Ltd.;

The glyceryl dipalmitate was purchased from Shanghai Hewu Biotechnology Co., Ltd.;

The methacryloyloxypropyltrimethoxysilane was purchased from Hubei Jusheng Technology Co., Ltd.;

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

Example 1

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

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

Example 2

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

The modified nanocellulose has a diameter of 80±20 nm and a length of 3±1 μm.

Example 3

This embodiment provides a modified nanocellulose for rolling oil. The modified nanocellulose for rolling oil is made of γ-methacryloyloxypropyltrimethoxysilane (KH570). The hydroxyl groups generated by hydrolysis are combined with the hydroxyl groups of nanocellulose. The structure of the modified nanocellulose used in rolling oil is as follows (average degree of polymerization is 100):

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

Example 4-9

This embodiment provides six kinds of modified nanocellulose for rolling oil. The difference between the modified nanocellulose and Example 1 is only in the hydrophobic group. The hydrophobic modified group is shown in Table 1.

Table 1

Application example 1

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

The preparation method of the environmentally friendly ultra-high-strength steel rolling oil is:

(1) Heat the natural oil to 85°C, then add antioxidants and anti-rust agents, mix and homogenize;

(2) Add synthetic ester to the mixture obtained after homogenization in step (1), mix and homogenize;

(3) After cooling to 45°C, add modified nanocellulose, emulsifier, extreme pressure agent, co-solvent, and pH regulator for rolling oil, stir and homogenize, and obtain the result.

Application Example 2-9

This embodiment provides eight environmentally friendly ultra-high-strength steel rolling oils. The only difference between the environmentally-friendly ultra-high-strength steel rolling oils and Application Example 1 is that the modified nanocellulose used in the rolling oil is replaced by equal amounts. It is the modified nanocellulose for rolling oil prepared in Examples 2-9. The remaining components and addition amounts remain unchanged. The preparation method is as described in Application Example 1.

Comparative application example 1

This comparative application example provides an environmentally friendly ultra-high-strength steel rolling oil. The only difference between the environmentally-friendly ultra-high-strength steel rolling oil and Application Example 1 is that it does not add modified nanocellulose for rolling oil. The reduced amount is made up by the co-solvent, and the remaining components and added amounts remain unchanged. The preparation method is as described in Application Example 1.

Comparative application example 2

This comparative application example provides an environmentally friendly ultra-high-strength steel rolling oil. The only difference between the environmentally-friendly ultra-high-strength steel rolling oil and Application Example 1 is that the equivalent amount of modified nanocellulose used in the rolling oil is Replace it with unmodified nanocellulose, and keep the other components and addition amounts unchanged. The preparation method is as described in Application Example 1.

Comparative application example 3

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

Test Example 1 Oil Film Thickness Evaluation

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 measuring instrument. The instrument rotated at 800mm/s. The results are shown in Table 2.

Table 2

Test Example 2 Friction Performance Test

The samples of Application Examples 1-9, Comparative Application Examples 1-3 and commercially available samples were measured using a four-ball friction testing machine to measure the four-ball PB value, and the RCP reciprocating friction testing machine was used to measure the RCP friction coefficient;

(1) The four-ball PB value test method is carried out with reference to GB/T12583-1998;

(2) The RCP friction coefficient test method is to apply 5uL sample to the surface of the steel ball. Under the set conditions (225℃, load 4.5kg), let the steel ball reciprocate on the steel plate for at least 40 cycles; then take the 2nd to 5th The average friction coefficient of each cycle is the RCP friction coefficient. The results are shown in Table 3.

table 3

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 higher oil film thickness, higher four-ball PB value and lower The RCP friction coefficient, the oil film thickness is above 883mm, the four-ball PB value is above 170kgf, and the RCP friction coefficient is below 0.068, indicating that the rolling oil of the present invention has strong wear resistance and reduces the friction during the rolling process. The probability of local large plastic deformation occurring on the surface of the rolled material can effectively reduce the roll sticking phenomenon.

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 four-ball PB value are significantly lower, and the RCP friction coefficient is higher, indicating the anti-wear properties of the rolling oil. Performance is significantly worse.

In Comparative Application Example 2, when nanocellulose is not modified, its addition to rolling oil cannot improve the wear resistance of rolling oil.

In Comparative Application Example 3, when conventional lubricating components are added to the rolling oil, its lubricating performance is not as good as the rolling oil sample added with hydrophobic modified cellulose.

The applicant declares that the present invention illustrates the modified nanocellulose for rolling oil and its application through the above embodiments, but the present invention is not limited to the above embodiments, which does not mean that the present invention must rely on the above. Embodiments can be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent replacement of raw materials of the product of the present invention, addition of auxiliary ingredients, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims (10)

1. A modified nanocellulose for rolling oil, characterized in that the modified nanocellulose for rolling oil is hydrophobic group-modified nanocellulose; The molecular structure of the hydrophobic group-modified nanocellulose is Where R is selected from hydrophobic groups, n<300; 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. 2. 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. 3. Modified nanocellulose for rolling oil according to claim 1 or 2, characterized in that the hydrophobic group modification method includes esterification/acetylation modification and graft copolymerization modification. Or any one of the silane coupling agent modifications; Preferably, the esterification/acetylation modification includes using fatty acids and/or fatty acid anhydrides to undergo nucleophilic substitution reactions with hydroxyl groups in the nanocellulose; Preferably, the fatty acids include C2-C30 fatty acids; Preferably, the fatty acid anhydride includes C2-C30 fatty acid anhydride; Preferably, the fatty acids include acetic acid, propionic acid, n-butyric acid, isobutyric acid, n-valeric acid, pivalic acid, caproic acid, nonanoic acid, isononanoic acid, caprylic acid, heptanoic acid, n-decanoic acid, and neodecanoic acid. , any one or a combination of at least two of lauric acid, palmitic acid, oleic acid or stearic acid; Preferably, the fatty acid anhydride includes acetic anhydride, propionic anhydride, n-butyric anhydride, isobutyric anhydride, n-valeric anhydride, pivalic anhydride, caproic anhydride, nonanoic anhydride, isononanoic anhydride, octanoic anhydride, heptanoic anhydride, n-decanoic anhydride, Any one or a combination of at least two of neodecanoic anhydride, lauric anhydride, palmitic anhydride, oleic anhydride or stearic anhydride. 4. Modified nanocellulose for rolling oil according to claim 3, characterized in that the graft copolymerization modification includes grafting fatty acid esters and/or phosphates to nanometer cellulose through covalent bonds. cellulose surface; Preferably, the fatty acid ester includes any one or a combination of at least two of C2-C30 fatty acid monoester, C2-C30 fatty acid diester, C2-C30 fatty acid triester or C2-C30 fatty acid tetraester; Preferably, the phosphate includes C8-C16 phosphate. 5. Modified nanocellulose for rolling oil according to claim 3 or 4, characterized in that the silane coupling agent modification includes a combination of hydroxyl groups generated by hydrolysis of the silane coupling agent and nanocellulose. hydroxyl group for bonding; Preferably, the silane coupling agent includes any one or a combination of at least two of aminosilane, epoxysilane, vinylsilane or methacryloxysilane; Preferably, the diameter of the modified nanocellulose is ≤100 nm and the length is 1-5 μm. 6. Application of the modified nanocellulose for rolling oil according to any one of claims 1 to 5 in metal rolling oil. 7. 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 the components of any one of claims 1-5 for use in parts by weight. Rolling oil modified nanocellulose 0.1-2 parts, natural oil 20-55 parts, synthetic ester 20-55 parts, emulsifier 0.5-2.5 parts, extreme pressure agent 0.5-3 parts, co-solvent 0.1-5 parts, 1-3 parts of antioxidant, 1-3 parts of anti-rust agent, 0.3-1 part of pH adjuster. 8. The environmentally friendly ultra-high-strength steel rolling oil according to claim 7, characterized in that the natural oil includes any one or at least two of soybean oil, palm oil, rapeseed oil or palm kernel oil. combination; Preferably, the synthetic ester includes pentaerythritol coconut oleic acid/oleic acid mixed acid tetraester, trimethylolpropane monoacid triester, trimethylolpropane coconut oleic acid triester, neopentyl glycol monoacid diester or polyester. Any one or a combination of at least two of ethylene glycol coconut oleic acid diesters; Preferably, the emulsifier includes any one of fatty alcohol polyoxyethylene ether, cetearyl alcohol, cetearyl alcohol ether, ethoxylated cetearyl alcohol or isomeric tridecanol polyoxyethylene ether. species or a combination of at least two species; Preferably, the extreme pressure agent includes amine phosphate, alkylamine phosphate, oleyl alcohol phosphate, isotridecanol phosphate, tetradecanol ether phosphate or C12-14 tert-alkylamine phosphate sec-butyl Any one or a combination of at least two of base and isobutyl mixed fats; Preferably, the co-solvent includes any one or a combination of at least two of diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, propylene glycol propyl ether, hexylene glycol or propylene glycol; Preferably, the antioxidant includes 4,4-methylenebis(2,6-di-tert-butylphenol) and/or 2,6-di-tert-butyl-a-dimethylamino-p-cresol; Preferably, the rust inhibitor includes any one or a combination of at least two of methylbenzotriazole, benzotriazole or benzotriazole derivatives; Preferably, the pH adjuster includes isooctanoic acid and/or dicyclohexylamine. 9. The preparation method of environmentally friendly ultra-high strength steel rolling oil according to claim 7 or 8, characterized in that the preparation method includes: (1) Heat the natural oil to 80-92°C, then add antioxidants and anti-rust agents, mix and homogenize; (2) Add synthetic ester to the mixture obtained after homogenization in step (1), mix and homogenize; (3) After cooling to 40-50°C, add modified nanocellulose, emulsifier, extreme pressure agent, co-solvent, and pH regulator for rolling oil as described in any one of claims 1-5, Stir and homogenize. 10. A method of using the environmentally friendly ultra-high-strength steel rolling oil according to claim 7 or 8, characterized in that the method of use includes: rolling the environmentally-friendly ultra-high-strength steel during the rolling process. The oil is dispersed in deionized water to form an emulsion system, and rolled in the form of an emulsion. The pH of the emulsion system is 4-5, the conductivity is <300 μs/cm, and the particle size is 5-20 μm; The mass concentration of the environmentally friendly ultra-high-strength steel rolling oil in the emulsion system is 1%-3%.