Environmentally friendly cutting fluid and preparation method thereof

Abstract

The invention discloses an environment-friendly cutting fluid. The environment-friendly cutting fluid comprises the following raw materials in parts by weight: 1-20% of a lubricant, 5-10% of a rust inhibitor, and 2-5% of an alcohol amine; the balance is deionized water; the environment-friendly cutting fluid does not release organic volatiles, and as a water-based cutting fluid, the environment-friendly cutting fluid has good antibacterial performance, rust prevention and lubricity as well as cooling performance, and meets the requirements of metal cutting fluid.

Description

Technical Field

[0001] The invention belongs to the field of cutting fluid, and in particular relates to an environmentally friendly cutting fluid and a preparation method thereof. Background Art

[0002] Cutting fluid is a material used to cool and lubricate tools and workpieces during metal processing. The use of cutting fluid can significantly reduce the friction between cutting tools and workpieces to reduce cutting temperature, while reducing tool wear, increasing tool life, and ensuring workpiece processing accuracy. Therefore, cutting fluid plays an important role in improving processing quality and reducing processing costs. With the continuous development of cutting technology, traditional oil-based cutting fluids have problems such as difficulty in cleaning and difficulty in waste liquid treatment, which cause secondary pollution to the environment. Environmentally friendly and pollution-free water-based cutting fluids have received widespread attention. Although the existing water-based cutting fluids are easy to clean, environmentally friendly and have good cooling performance, they are still insufficient in antibacterial and anti-rust properties. Therefore, it is urgent to research and develop an environmentally friendly and fully functional cutting fluid to meet the needs of metal cutting technology. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides an environmentally friendly cutting fluid, which does not release organic volatiles. As a water-based cutting fluid, it has good antibacterial properties, rust prevention, lubricity and cooling properties, and meets the requirements of cutting fluid.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An environmentally friendly cutting fluid comprises the following raw materials in parts by weight: 1-20% lubricant, 5-10% rust inhibitor, 2-5% alcohol amine; the balance is deionized water;

[0006] Preferably, the lubricant is a mixture of alkylated chitosan, polyethylene glycol, pentaerythritol and polyether;

[0007] Preferably, the weight ratio of the alkylated chitosan, polyethylene glycol, pentaerythritol and polyether is 1:1:1:2;

[0008] Preferably, the alkylated chitosan is dodecyl chitosan;

[0009] Furthermore, the preparation method of dodecyl chitosan is specifically as follows: gradually adding lauryl aldehyde to the acetic acid solution of chitosan, stirring the reaction, adjusting the pH of the system to 5, then slowly adding sodium borohydride and stirring the reaction, adjusting the pH of the system to 7 again, precipitating the product, and centrifuging and washing to obtain dodecyl chitosan.

[0010] Preferably, the rust inhibitor is a mixture of glyceric acid, malonic acid, and ternary polycarboxylic acid in a weight ratio of 1:1:1;

[0011] Preferably, the alcoholamines are one or more of methylethanolamine and butylethanolamine;

[0012] Furthermore, the preparation method of the environmentally friendly cutting fluid specifically includes the following steps: taking deionized water, adding lubricant thereto and stirring evenly, heating in a water bath to 40-60°C, adding rust inhibitor and alcohol amine in sequence under stirring conditions, stirring evenly after each reagent is added before adding the next reagent, and after all reagents are completely added, continue to stir evenly and then filter to obtain the environmentally friendly cutting fluid.

[0013] Beneficial Effects

[0014] The cutting fluid of the present invention is a fully synthetic water-based cutting fluid, which is a water-soluble component and has good stability, cooling and cleaning properties; it does not contain formaldehyde, phosphorus, sulfur and other components harmful to the human body, does not release volatile organic gases, and is environmentally friendly; the cutting fluid of the present invention also has a good antibacterial effect, is not easy to corrupt and deteriorate, has strong stability, and has a long service life and shelf life. The cutting fluid of the present invention also has good lubrication performance, rust prevention performance and antibacterial performance.

[0015] The cutting fluid of the invention uses alkylated chitosan, polyethylene glycol, pentaerythritol and polyether as lubricants and is matched with other ingredients. The cutting fluid prepared has not only strong self-stability but also good lubricity, antibacterial property and anti-rust property, and meets the needs of metal cutting fluid. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with specific embodiments. Unless otherwise specified, the raw materials used in the present invention can be purchased from the market.

[0017] Example 1

[0018] Preparation of alkylated chitosan

[0019] (1) Preparation of chitosan solution: dissolving chitosan powder in acetic acid solution to prepare a 1 wt% chitosan solution;

[0020] (2) Preparation of alkylated chitosan: lauryl aldehyde is added to the chitosan solution, stirred for reaction, and then the pH of the system is adjusted to 5. Then, sodium borohydride is slowly added and the reaction is continued with stirring, and the pH of the system is adjusted to 7 again. After precipitation, the solution is filtered and repeatedly washed with ethanol and deionized water to remove excess lauryl aldehyde. After drying and grinding, dodecylated chitosan is obtained.

[0021] Example 2

[0022] An environmentally friendly cutting fluid comprises the following raw materials in parts by weight: 1% lubricant, 5% rust inhibitor, 2% alcohol amines; the balance is deionized water; the lubricant is composed of alkylated chitosan, polyethylene glycol, pentaerythritol, and polyether in a weight ratio of 1:1:1:2; the rust inhibitor is composed of glyceric acid, malonic acid, and tribasic polycarboxylic acid in a weight ratio of 1:1:1; the alcohol amine is methylethanolamine; and the alkylated chitosan is prepared according to Example 1.

[0023] The preparation method of the environmentally friendly cutting fluid specifically comprises the following steps: taking deionized water, adding a lubricant thereto and stirring evenly, heating in a water bath to 40°C, adding a rust inhibitor and methylethanolamine in sequence under stirring conditions, stirring evenly after each reagent is added before adding the next reagent, and after all reagents are completely added, continuing to stir evenly and filtering to obtain the environmentally friendly cutting fluid.

[0024] Example 3

[0025] An environmentally friendly cutting fluid comprises the following raw materials in parts by weight: 10.5% of a lubricant, 7.5% of a rust inhibitor, and 3.5% of an alcohol amine; the balance is deionized water; the lubricant is a mixture of alkylated chitosan, polyethylene glycol, pentaerythritol, and polyether in a weight ratio of 1:1:1:2; the rust inhibitor is a mixture of glyceric acid, malonic acid, and tribasic polycarboxylic acid in a weight ratio of 1:1:1; the alcohol amine is methylethanolamine; and the alkylated chitosan is prepared according to Example 1.

[0026] The preparation method of the environmentally friendly cutting fluid specifically comprises the following steps: taking deionized water, adding a lubricant thereto and stirring evenly, heating in a water bath to 50°C, adding a rust inhibitor and methylethanolamine in sequence under stirring conditions, stirring evenly after each reagent is added before adding the next reagent, and after all reagents are completely added, continuing to stir evenly and filtering to obtain the environmentally friendly cutting fluid.

[0027] Example 4

[0028] An environmentally friendly cutting fluid comprises the following raw materials in parts by weight: 20% lubricant, 10% rust inhibitor, 5% alcohol amines; the balance is deionized water; the lubricant is a mixture of alkylated chitosan, polyethylene glycol, pentaerythritol, and polyether in a weight ratio of 1:1:1:2; the rust inhibitor is a mixture of glyceric acid, malonic acid, and tribasic polycarboxylic acid in a weight ratio of 1:1:1; the alcohol amine is methylethanolamine; and the alkylated chitosan is prepared according to Example 1.

[0029] The preparation method of the environmentally friendly cutting fluid specifically comprises the following steps: adding a lubricant to deionized water and stirring evenly, heating the mixture to 60°C in a water bath, sequentially adding a rust inhibitor and methylethanolamine under stirring conditions, stirring evenly after each reagent is added before adding the next reagent, and after all reagents are completely added, continuing to stir evenly and filtering to obtain the environmentally friendly cutting fluid.

[0030] Comparative Example 1

[0031] An environmentally friendly cutting fluid comprises the following raw materials in parts by weight: 10.5% lubricant, 7.5% rust inhibitor, 3.5% alcohol amine; the balance is deionized water; the lubricant is a mixture of polyethylene glycol, pentaerythritol, and polyether in a weight ratio of 1:1:2; the rust inhibitor is a mixture of glyceric acid, malonic acid, and tribasic polycarboxylic acid in a weight ratio of 1:1:1; the alcohol amine is methylethanolamine;

[0032] The preparation method of the environmentally friendly cutting fluid specifically comprises the following steps: taking deionized water, adding a lubricant thereto and stirring evenly, heating in a water bath to 50°C, adding a rust inhibitor and methylethanolamine in sequence under stirring conditions, stirring evenly after each reagent is added before adding the next reagent, and after all reagents are completely added, continuing to stir evenly and filtering to obtain the environmentally friendly cutting fluid.

[0033] Cutting fluid performance test

[0034] The performance of the cutting fluid obtained in Examples 1-3 of the present invention was tested. The test method was based on GB / T6144-2010. The test results are shown in Table 1.

[0035] Table 1.

[0036]

[0037] As can be seen from Table 1, the cutting fluids prepared in Examples 1-3 of the present invention are non-stratified, non-precipitated, and uniform liquids; all the properties of the cutting fluids are qualified and meet the use requirements; while the maximum non-seizure load in Comparative Example 1 is lower than that in Examples 1-3; indicating that the addition of alkylated chitosan to the lubricant raw material of the cutting fluid of the present invention significantly improves the extreme pressure lubrication performance of the cutting fluid; at the same time, the cutting fluid prepared in the examples of the present invention has a longer storage period than the comparative example. Therefore, the addition of alkylated chitosan to the cutting fluid of the present invention not only makes the cutting fluid have good antibacterial properties and improves the storage stability of the cutting fluid, but also significantly improves the extreme pressure lubrication performance of the cutting fluid.

[0038] Finally, it should be noted that the above embodiments are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the technical field within the technical scope disclosed in the present invention all fall within the protection scope of the present invention.

Claims

1. An environmentally friendly cutting fluid, characterized in that: The invention comprises the following raw materials in parts by weight: 1-20% lubricant, 5-10% rust inhibitor, 2-5% alcohol amine; the balance is deionized water; The lubricant is a mixture of alkylated chitosan, polyethylene glycol, pentaerythritol and polyether, and the weight ratio of alkylated chitosan, polyethylene glycol, pentaerythritol and polyether is 1:1:1:2; The alkylated chitosan is dodecyl chitosan. The preparation method of dodecyl chitosan is as follows: gradually adding lauryl aldehyde to an acetic acid solution of chitosan, stirring the reaction, adjusting the pH of the system to 5, then slowly adding sodium borohydride and stirring the reaction, adjusting the pH of the system to 7 again, precipitating the product, and centrifuging and washing to obtain dodecyl chitosan.

2. The environmentally friendly cutting fluid according to claim 1, characterized in that: The rust inhibitor is a mixture of glyceric acid, malonic acid and ternary polycarboxylic acid in a weight ratio of 1:1:

1.

3. The environmentally friendly cutting fluid according to claim 1, characterized in that: The alcohol amines are one or more of methylethanolamine and butylethanolamine.

4. The environmentally friendly cutting fluid according to claim 1, characterized in that: The preparation method of the environmentally friendly cutting fluid specifically comprises the following steps: adding a lubricant to deionized water and stirring evenly, heating the mixture in a water bath to 40-60°C, sequentially adding a rust inhibitor and an alcohol amine under stirring conditions, stirring evenly each time a reagent is added before adding the next reagent, and after all reagents are completely added, continuing to stir evenly and filtering to obtain the environmentally friendly cutting fluid.

Images