Pre-coated oil for high lubrication type aluminum zip-top can and preparation method thereof

Abstract

The present application relates to the field of C10M169 / 00, in particular to a high lubrication type pre-coated oil for aluminum zip-top can stock and a preparation method thereof.The preparation raw materials of the high lubrication type pre-coated oil for aluminum zip-top can stock include, in terms of mass fraction, 80-90 parts of polyol ester base oil, 1-5 parts of emulsifier, 1-5 parts of penetrant, 0.1-1 part of lubricant, 1-5 parts of rust inhibitor and 1-5 parts of antioxidant.The pre-coated oil provided by the present application has a wide source of preparation raw materials and certain environmental protection performance;the preparation method is relatively simple, only needs to be mixed and dispersed according to a certain feeding order, and does not need complex and expensive instruments and equipment;the lubrication performance and adhesion performance of the product are excellent, and there is no residual oil after cleaning, and the product is especially suitable for use of aluminum zip-top cans.

Description

Technical Field

[0001] This invention relates to the field of C10M169 / 00, and more specifically, to a high-lubricity pre-coating oil for aluminum can filling and its preparation method. Background Technology

[0002] Aluminum beverage cans typically use 3-series aluminum alloy A3104-H19, with manganese as the main alloying element, as the base material. They are formed by drawing and rolling using a stamping die, followed by cleaning, passivation, coating, and printing processes, resulting in a packaging container with a unified can body and bottom. During production, aluminum beverage cans undergo electrostatic oiling to pre-coat the outer surface of the can, improving corrosion resistance, scratch resistance during transport, and reducing residual aluminum shavings. More importantly, as a lubricant for subsequent cup-filling and drawing operations, the pre-coated oil works synergistically with cup-filling oil and drawing fluid to lubricate the material surface.

[0003] Currently, pre-coated oil manufacturers and can manufacturers have increasingly higher demands for cost reduction and environmental protection. To further reduce production costs and consumption, some domestic manufacturers have begun using 0.26-0.27mm thick aluminum sheet / strip as the can body base material, and this thickness is still being gradually reduced. However, due to the reduction in the thickness of the aluminum sheet / strip, the requirements for the degree of tensile deformation are higher during the can manufacturing process, especially for 500mL cans. This leads to increased difficulty in controlling defects such as tensile streaks and can breakage, and places higher demands on the lubrication performance of the pre-coated oil.

[0004] Currently, conventional pre-coating oils on the market are usually made from mineral oil. For example, patent CN117285975A discloses an easy-to-clean pre-coating oil, whose main raw materials include mineral oil, synthetic ester, lubricant enhancer, polymer emulsifier, penetrant, etc. However, mineral oil has poor biodegradability and is prone to causing environmental pollution. Therefore, how to provide a low-cost, environmentally friendly, high-lubricity pre-coating oil has become an urgent industry technical problem to be solved. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the first aspect of the present invention provides a high-lubricity pre-coating oil for aluminum can filling, the raw materials of which include: polyol ester base oil, emulsifier, penetrant, lubricant, rust inhibitor and antioxidant.

[0006] As an feasible example, the raw materials for preparing the pre-coated oil for high-lubricity aluminum can filler, by weight, include: 80-90 parts polyol ester base oil, 1-5 parts emulsifier, 1-5 parts penetrant, 0.1-1 parts lubricant, 1-5 parts rust inhibitor and 1-5 parts antioxidant.

[0007] As an implementable example, the polyol ester base oil includes: trimethylolpropane octyl decanoate and / or neopentyl glycol dioleate.

[0008] Furthermore, the polyol ester base oil is trimethylolpropane octyl decanoate and neopentyl glycol dioleate.

[0009] Furthermore, the mass ratio of the trimethylolpropane octyl decanoate to neopentyl glycol dioleate is (6-7):(3-4).

[0010] Furthermore, the kinematic viscosity of the polyol ester base oil at 25°C is 22-30 mmHg. 2 / s.

[0011] Furthermore, the brand name of the trimethylolpropane octyl decanoate is Priolube 3970, which is available from Heda Chemical; the neopentyl glycol dioleate is available from Hubei Kemaidi.

[0012] Currently, most commercially available pre-coating oils are made primarily from mineral oil. However, mineral oil has relatively low environmental performance. Therefore, this invention selects polyol ester base oil, especially a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, as the polyol ester base oil. Due to its relatively good biodegradability, it can significantly improve the environmental performance of the pre-coating oil.

[0013] Both trimethylolpropane octyl decanoate and neopentyl glycol dioleate possess excellent lubricity and wear resistance, helping to reduce friction and wear between the pre-coated oil and the aluminum can body during coating and printing. Simultaneously, trimethylolpropane octyl decanoate and neopentyl glycol dioleate remain stable at high temperatures and are not easily oxidized or decomposed, contributing to the high-temperature stability of the pre-coated oil. The excellent hydrolytic stability and low volatility of the polyol ester base oil help form a durable waterproof layer, preventing moisture and humidity from penetrating the pre-coated oil surface and ensuring the waterproofness and durability of the aluminum can. However, the viscosity of the polyol ester base oil needs further limitation. A suitable viscosity ensures superior adhesion and processing performance of the pre-coated oil. Excessive viscosity hinders printing on the can surface and makes it difficult for air to escape from the coating, easily forming bubbles on the surface. During drying, the coating may crack due to excessive internal stress, affecting its integrity and aesthetics. Therefore, the present invention preferably uses a compound of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, which has a kinematic viscosity of 22-30 mmHg at 25°C. 2 Under conditions of / s, as a polyol ester base oil, it can ensure excellent wear resistance, aging resistance and coating stability of the pre-coated oil.

[0014] As an implementable example, the emulsifier includes at least one of anionic emulsifiers, cationic emulsifiers, and nonionic emulsifiers.

[0015] Furthermore, the emulsifier is a nonionic emulsifier.

[0016] As an example of implementation, the nonionic emulsifier includes one of the following: fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, and oleic acid diethanolamide.

[0017] Furthermore, the emulsifier is oleic acid diethanolamide, which can be purchased from Jiangsu Haian Petrochemical.

[0018] Nonionic emulsifiers improve the wettability of pre-coated oil on the surface of aluminum cans, making it easier for the pre-coated oil to spread onto the can surface and preventing the polyol ester base oil from seeping out of the system. Specifically, this invention preferably uses oleic acid diethanolamide as a nonionic emulsifier, mainly because oleic acid diethanolamide has a stable chemical structure, maintaining stable performance under high temperature and high humidity conditions. Its amide bonds and hydroxyl groups have strong heat resistance, making it less prone to decomposition or deterioration at high temperatures. Furthermore, oleic acid diethanolamide can form a dense protective film on the metal surface of the aluminum can, effectively blocking moisture and high-temperature corrosion, thus protecting the metal surface from damage. This dense protective film also reduces direct contact and friction between the pre-coated oil and the can surface, significantly lowering the coefficient of friction of the pre-coated oil. In addition, oleic acid diethanolamide can synergistically work with rust inhibitors to further improve the rust-preventive performance of the pre-coated oil.

[0019] As an example of an implementable method, the penetrant includes fatty alcohol alkoxy compounds.

[0020] Furthermore, the brand name of the fatty alcohol alkoxy compound includes LF403, which is available from BASF.

[0021] Fatty alcohol alkoxy compounds can significantly reduce the surface tension of pre-coated oil, making it easier for the pre-coated oil to spread and wet the surface of aluminum cans, and also have a certain defoaming effect. In addition, the molecular structure of fatty alcohol alkoxy compounds allows them to form a directional adsorption layer on the surface of the can, increasing its surface hydrophilicity, making it easier for the pre-coated oil to adhere evenly. In this invention, fatty alcohol alkoxy compounds with the grade LF403 are preferred as penetrants. LF403 can also work together with oleic acid diethanolamide to effectively prevent the pre-coated oil from sticking by reducing friction and electrostatic attraction, making it easier for the pre-coated oil to be completely washed off in the subsequent cleaning process.

[0022] As an example of an implementable method, the lubricant includes one or more of the following: natural wax, synthetic wax, zinc stearate, aluminum distearate, dibutyl phthalate, and pentaerythritol stearate.

[0023] Furthermore, the lubricant is pentaerythritol stearate, which is available from Wuhan Kemic Biotechnology.

[0024] Pentaerythritol stearate can increase the plasticity of pre-coated oil, making it easier to deform and flow during printing, thereby improving the adhesion and coverage of the pre-coated oil. At the same time, pentaerythritol stearate can form a uniform lubricating film on the surface of the pre-coated oil, reducing the frictional resistance between the pre-coated oil and the surface of the aluminum can, allowing the pre-coated oil to spread more smoothly on the substrate surface. In addition, pentaerythritol stearate also has certain antioxidant and thermal stability properties, which, together with antioxidants, can prevent the pre-coated oil from oxidizing, deteriorating or thermally decomposing during storage and use.

[0025] As an example of implementation, the rust inhibitor includes carboxylic acid derivatives or amino acid derivatives.

[0026] As an implementable example, the carboxylic acid derivative includes 2,4,6-tris(aminohexanoic acid)-1,3,5-triazine; and the amino acid derivative includes N-oleoylsarcosine.

[0027] In this invention, a suitable rust inhibitor can form a uniform and dense thin film layer on the surface of the aluminum plate, preventing the intrusion of corrosive substances and protecting the surface of the aluminum can from oxidation and corrosion; and the thin film layer can effectively reduce the friction coefficient of the pre-coated oil, further improving the lubricity of the aluminum can surface.

[0028] Preferably, the antioxidant includes one of the following: phenolic antioxidants, diphenolic antioxidants, isothiocyanate antioxidants, phosphate antioxidants, and carboxylic acid antioxidants.

[0029] Furthermore, the antioxidant is a carboxylic acid antioxidant.

[0030] Furthermore, the carboxylic acid antioxidant is neodecanoic acid.

[0031] Neodecanoic acid can inhibit the redox reaction between raw material components in the pre-coated oil system, and at the same time inhibit the generation of foam in the system, thereby improving the stability of the pre-coated oil. In addition, neodecanoic acid can shorten the drying time and increase the hardness of the pre-coated oil film, which helps to improve the hardness and wear resistance of the aluminum can coating, making the printed pattern of the pre-coated oil more durable.

[0032] A second aspect of the present invention provides a method for preparing a pre-coated oil for high-lubricity aluminum can filling, comprising:

[0033] S1. Set the temperature of the thermostatic reactor to 38-42℃ and add polyol ester base oil;

[0034] S2. Then add rust inhibitor and antioxidant, and disperse at a stirring speed of 100-150 rpm for 1-2 hours;

[0035] S3. Then slowly and evenly add the emulsifier dropwise over a period of 3-5 minutes; after adding, disperse the emulsifier at a stirring speed of 100-150 rpm for 1-2 hours.

[0036] S4. Add the penetrant and disperse for 1-2 hours at a stirring speed of 100-150 rpm.

[0037] S5. Finally, add the lubricant and disperse at a stirring speed of 100-150 rpm for 12-24 hours to obtain the final product.

[0038] Beneficial effects

[0039] (i) In this invention, a specific polyol ester base oil is selected as the raw material for the preparation of the pre-coating oil to replace the mineral oil commonly used in the market. This can ensure the high adhesion performance of the pre-coating oil while further improving the environmental performance of the product.

[0040] (ii) In this invention, oleic acid diethanolamide is preferred as an emulsifier. It has a stable chemical structure, can maintain the stability of the pre-coated oil performance under high temperature and high humidity conditions, and can also significantly reduce the friction coefficient of the pre-coated oil. At the same time, oleic acid diethanolamide can also work synergistically with rust inhibitors to further improve the rust prevention performance of the pre-coated oil.

[0041] (III) In this invention, fatty alcohol alkoxylates are selected as penetrants, which can improve the penetration and adsorption speed and wettability of pre-coated oil on the surface of aluminum cans, making the pre-coated oil adhere more evenly; in addition, fatty alcohol alkoxylates can also work synergistically with oleic acid diethanolamide to prevent the pre-coated oil from sticking, making the pre-coated oil easier to wash off in the subsequent cleaning process.

[0042] (iv) By selecting appropriate lubricants and rust inhibitors in this invention, the lubrication and wear resistance of the pre-coated oil can be further improved, ensuring that the coating has higher stability after the product is used.

[0043] (v) In this invention, the raw materials are widely available and the cost is low; and the preparation method is relatively simple, requiring only the addition, mixing and dispersing of materials in a certain order, without the need for complex and expensive instruments and equipment; the pre-coated oil has excellent lubricating properties and leaves no oil residue after cleaning, making it particularly suitable for printing on the surface of aluminum cans. Detailed Implementation

[0044] Example 1

[0045] The first aspect of this example provides a high-lubricity pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 85 parts polyol ester base oil, 4 parts emulsifier, 5 parts penetrant, 1 part lubricant, 2 parts rust inhibitor and 3 parts antioxidant.

[0046] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 7:3. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate was purchased from Hubei Kemaidi.

[0047] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0048] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0049] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0050] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0051] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0052] The second aspect of this example provides a method for preparing a pre-coated oil for high-lubricity aluminum can fill, including:

[0053] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0054] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0055] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0056] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0057] S5. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0058] Example 2

[0059] The first aspect of this example provides a high-lubricity pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 90 parts polyol ester base oil, 2 parts emulsifier, 5 parts penetrant, 0.5 parts lubricant, 1 part rust inhibitor and 2 parts antioxidant.

[0060] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0061] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0062] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0063] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0064] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0065] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0066] The second aspect of this example provides a method for preparing a pre-coated oil for high-lubricity aluminum can fill, including:

[0067] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0068] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0069] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0070] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0071] S5. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0072] Comparative Example 1

[0073] The first aspect of this example provides a pre-coating oil for aluminum can filling, the raw materials of which, by weight, include: 90 parts polyol ester base oil, 5 parts penetrant, 1 part lubricant, 2 parts rust inhibitor and 2 parts antioxidant.

[0074] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0075] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0076] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0077] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0078] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0079] The second aspect of this example provides a method for preparing a pre-coated oil for aluminum can fillings, including:

[0080] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0081] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0082] S3. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0083] S4. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0084] Comparative Example 2

[0085] The first aspect of this example provides a pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 90 parts of polyol ester base oil, 4 parts of emulsifier, 0.5 parts of lubricant, 2 parts of rust inhibitor and 3.5 parts of antioxidant.

[0086] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0087] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0088] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0089] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0090] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0091] The second aspect of this example provides a method for preparing a pre-coated oil for aluminum can fillings, including:

[0092] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0093] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0094] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0095] S4. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0096] Comparative Example 3

[0097] The first aspect of this example provides a pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 86 parts of polyol ester base oil, 4 parts of emulsifier, 5 parts of penetrant, 2 parts of rust inhibitor and 3 parts of antioxidant.

[0098] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0099] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0100] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0101] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0102] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0103] The second aspect of this example provides a method for preparing a pre-coated oil for aluminum can fillings, including:

[0104] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0105] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0106] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0107] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0108] Comparative Example 4

[0109] The first aspect of this example provides a pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 87 parts polyol ester base oil, 4 parts emulsifier, 5 parts penetrant, 1 part lubricant and 3 parts antioxidant.

[0110] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0111] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0112] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0113] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0114] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0115] The second aspect of this example provides a method for preparing a pre-coated oil for aluminum can fillings, including:

[0116] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0117] S2. Then add antioxidants and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0118] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0119] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0120] S5. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0121] Comparative Example 5

[0122] The first aspect of this example provides a high-lubricity pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 84 parts polyol ester base oil, 6 parts emulsifier, 5 parts penetrant, 1 part lubricant, 2 parts rust inhibitor and 2 parts antioxidant.

[0123] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0124] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0125] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0126] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0127] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0128] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0129] The second aspect of this example provides a method for preparing a pre-coated oil for high-lubricity aluminum can fill, including:

[0130] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0131] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0132] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0133] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0134] S5. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0135] Comparative Example 6

[0136] The first aspect of this example provides a high-lubricity pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 85 parts polyol ester base oil, 4 parts emulsifier, 6 parts penetrant, 1 part lubricant, 2 parts rust inhibitor and 2 parts antioxidant.

[0137] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0138] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0139] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0140] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0141] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0142] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0143] The second aspect of this example provides a method for preparing a pre-coated oil for high-lubricity aluminum can fill, including:

[0144] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0145] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0146] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0147] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0148] S5. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0149] Comparative Example 7

[0150] The first aspect of this example provides a high-lubricity pre-coating oil for aluminum can filling, the raw materials of which, by mass parts, include: 84 parts polyol ester base oil, 4 parts emulsifier, 5 parts penetrant, 1 part lubricant, 6 parts rust inhibitor and 3 parts antioxidant.

[0151] The polyol ester base oil is a blend of trimethylolpropane octyl decanoate and neopentyl glycol dioleate, with a blending mass ratio of 6:4. The brand of trimethylolpropane octyl decanoate is Croda Priolube 3970, and the neopentyl glycol dioleate is purchased from Hubei Kemaidi.

[0152] The emulsifier mentioned is oleic acid glycol amide, purchased from Haian Petrochemical.

[0153] The penetrant is a fatty alcohol alkoxy compound, brand name LF403, purchased from BASF.

[0154] The lubricant is pentaerythritol stearate, purchased from Wuhan Kemic Biotechnology.

[0155] The rust inhibitor is N-oleoylsarcosine; CAS number: 110-25-8.

[0156] The antioxidant mentioned is neodecanoic acid, CAS number: 26896-20-8.

[0157] The second aspect of this example provides a method for preparing a pre-coated oil for high-lubricity aluminum can fill, including:

[0158] S1. Set the temperature of the thermostatic reactor to 40℃ and add polyol ester base oil;

[0159] S2. Then add rust inhibitor and antioxidant, and disperse at 40°C for 2 hours with stirring speed of 120 rpm.

[0160] S3. Then slowly and evenly add the emulsifier dropwise over a period of 4 minutes; after addition, disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0161] S4. Add the penetrant and disperse at a constant temperature of 40°C for 1 hour while stirring at 120 rpm.

[0162] S5. Finally, add the lubricant and disperse at a constant temperature of 40°C for 24 hours while stirring at 120 rpm.

[0163] Performance Evaluation

[0164] The test items and test methods are detailed in Table 1.

[0165] The test results are detailed in Table 2 and Table 2 Continued.

[0166] in:

[0167] The kinematic viscosity was tested at 40℃, and the unit is mm. 2 / s.

[0168] The high temperature and high humidity resistance test environment is 90% humidity and 60℃. The pre-coated oil coating is placed in this test environment and left to stand for 264 hours.

[0169] The lubricity of a product is specifically tested for its coefficient of friction.

[0170] The wettability test item is the contact angle between the substrate and the pre-coated oil.

[0171] The test item for the compatibility of the rinsing cup oil is the contact angle between the substrate after the pre-coated oil is applied and the rinsing cup oil.

[0172] Table 1

[0173]

[0174]

[0175]

[0176] Table 2

[0177]

[0178] Table 2 (continued)

[0179] Test Project Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 kinematic viscosity 30 38 29 40 High temperature and high humidity resistance black White spot corrosion on board surface White spot corrosion on board surface It does not discolor or corrode. lubricity 0.7 0.5 0.7 0.6 Wettability 10° 9° 7° 12° Oil compatibility of cup 9° 10° 9° 10° Cleaning properties No oil residue 1% oil residue No oil residue 3% oil residue

Claims

1. A high-lubricity pre-coating oil for aluminum can fillings, characterized in that, The raw materials for preparation consist of 80-90 parts by weight of polyol ester base oil, 1-5 parts of emulsifier, 1-5 parts of penetrant, 0.1-1 parts of lubricant, 1-5 parts of rust inhibitor and 1-5 parts of antioxidant; The polyol ester base oil is trimethylolpropane octyl decanoate and / or neopentyl glycol dioleate; The emulsifier is oleic acid diethanolamide; The penetrant is a fatty alcohol alkoxy compound; The rust inhibitor is a carboxylic acid derivative and / or an amino acid derivative; The lubricant is one or more of the following: natural wax, synthetic wax, zinc stearate, aluminum distearate, dibutyl phthalate, and pentaerythritol stearate.

2. The high-lubricity pre-coating oil for aluminum can filling according to claim 1, characterized in that, The kinematic viscosity of the polyol ester base oil at 25°C is 22-30 mm. 2 / s.

3. A method for preparing a pre-coated oil for high-lubricity aluminum can filling according to any one of claims 1-2, characterized in that, include: S1. Set the temperature of the thermostatic reactor to 38-42℃ and add polyol ester base oil; S2. Then add rust inhibitor and antioxidant, and disperse at a stirring speed of 100-150 rpm for 1-2 hours; S3. Then slowly and evenly add the emulsifier dropwise over a period of 3-5 minutes; after adding, disperse the emulsifier at a stirring speed of 100-150 rpm for 1-2 hours. S4. Add the penetrant and disperse for 1-2 hours at a stirring speed of 100-150 rpm. S5. Finally, add the lubricant and disperse at a stirring speed of 100-150 rpm for 12-24 hours to obtain the final product.

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