Antirust water-based semi-synthetic cutting fluid and preparation method thereof

Abstract

The invention provides an antirust water-based semi-synthetic cutting fluid and a preparation method thereof. The cutting fluid comprises the following raw materials in percentage by mass: 25%-32% of naphthenic base oil, 1%-3% of a surfactant, 1%-5% of an emulsifier, 2%-4% of oleic acid, 0.5%-2.5% of sodium sulfonate, 1%-5% of a bactericide, 2%-5% of glycerol, 0.2%-0.5% of a defoaming agent, 0.5%-1.5% of a corrosion inhibitor, 1%-5% of an antirust agent and the balance of water. The antirust agent is composed of triethanolamine, butylated hydroxytoluene and citric acid according to the mass ratio of (1-3): (1-2): (0.1-0.5). According to the cutting fluid, proper raw materials are compounded, so that the cutting fluid has relatively good comprehensive properties such as lubricating property, cooling property, corrosion resistance and anti-rust property. Particularly, the antirust agent obtained by compounding triethanolamine, butylated hydroxytoluene and citric acid according to a specific mass ratio is added into the cutting fluid, so that the cutting fluid can obtain excellent antirust performance.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing, and in particular relates to an anti-rust water-based semi-synthetic cutting fluid and a preparation method thereof. Background Art

[0002] Metal cutting fluid is a general term for various oils that provide lubrication, cooling, cleaning and rust prevention for machining in metal cutting and grinding. Cutting fluid can also effectively reduce cutting temperature and surface roughness, reduce cutting resistance, and increase the service life of tools and grinding wheels, thereby improving production efficiency and product quality. It plays a very important role in the process of metal cutting and grinding. Water-based semi-synthetic cutting fluid is a metalworking fluid that combines the advantages of oily cutting fluid and water-soluble cutting fluid. It is mainly composed of base oil, surfactant, rust inhibitor, extreme pressure agent, preservative and other additives and water. It can significantly reduce the wear of cutting tools, improve the machining accuracy of workpieces, and is easy to clean and discharge, meeting environmental protection requirements.

[0003] According to the friction, heat generation and rust between the workpiece and the cutting tool during metal processing, various additives can be scientifically proportioned to achieve the effects of reducing friction, reducing heat and preventing rust. Among them, preventing the workpiece and cutting tools from rusting during processing and storage is also an important performance indicator that metal cutting fluids need to have. Rust inhibitors can usually be added to synthetic metal cutting fluids to improve the rust resistance, but different rust inhibitors have different effects, and the selected rust inhibitor needs to be compatible with other raw materials in the formula to enable the metal cutting fluid to obtain a better comprehensive performance. Summary of the invention

[0004] Based on this, the object of the present invention is to provide a rust-proof water-based semi-synthetic cutting fluid and a preparation method thereof. The cutting fluid has relatively good comprehensive performance, especially excellent rust-proof performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] The first aspect of the present invention provides an aqueous semi-synthetic cutting fluid, comprising the following raw materials in mass fraction: 25% to 32% of cycloalkyl base oil, 1% to 3% of surfactant, 1% to 5% of emulsifier, 2% to 4% of oleic acid, 0.5% to 2.5% of sodium sulfonate, 1% to 5% of bactericide, 2% to 5% of glycerol, 0.2% to 0.5% of defoamer, 0.5% to 1.5% of corrosion inhibitor, 1% to 5% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in a mass ratio of (1 to 3): (1 to 2): (0.1 to 0.5).

[0007] In some embodiments, the rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in a mass ratio of (1.5-2.5): (1-1.5): (0.2-0.5).

[0008] In some embodiments, the rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in a mass ratio of 2:1:0.2.

[0009] In some embodiments, the surfactant is selected from at least one of Tween-80, polyethylene glycol 400, and dodecylbenzene sulfonate.

[0010] In some embodiments, the emulsifier is selected from at least one of fatty acid amide polyoxyethylene ether, dodecyl polyoxyethylene ether triethanolamine sulfate, nonylphenol polyoxyethylene ether and sorbitan monooleate.

[0011] In some embodiments, the defoaming agent is selected from at least one of diethylhexanol, castor oil polyoxyethylene ether and methyl silicone oil.

[0012] In some embodiments, the corrosion inhibitor is selected from at least one of fatty alcohol ether phosphate, potassium salt of isotridecanol ether phosphate, lauryl phosphate and isotridecanol ether phosphate.

[0013] The second aspect of the present invention provides a method for preparing the aqueous semi-synthetic cutting fluid as described above, comprising the following steps: (1) mixing a cycloalkyl base oil with a portion of water and stirring uniformly; (2) adding a surfactant and continuously stirring until the emulsification is uniform; (3) adding the remaining water, emulsifier, oleic acid, sodium sulfonate, glycerol, defoamer, corrosion inhibitor and rust inhibitor, stirring until they are completely dissolved.

[0014] In some embodiments, the stirring temperature is 30°C to 40°C.

[0015] The third aspect of the present invention provides the use of the aqueous semi-synthetic cutting fluid as described above in metal processing.

[0016] The present invention optimizes and obtains a rust-proof water-based semi-synthetic cutting fluid, and by compounding suitable raw materials, the cutting fluid has good comprehensive properties such as lubricity, cooling, corrosion resistance and rust resistance. In particular, by adding a rust inhibitor obtained by compounding triethanolamine, butylated hydroxytoluene and citric acid in a specific mass ratio (1-3:1-2:0.1-0.5) into the cutting fluid, a long-lasting protective film can be formed on the metal surface, so that the cutting fluid has excellent rust resistance.

[0017] The aqueous semi-synthetic cutting fluid of the present invention is suitable for cutting processing of various metal materials (such as steel, cast iron, copper, aluminum, etc.), including turning, milling, drilling, grinding and other processes. When used, the aqueous semi-synthetic cutting fluid of the present invention is added to the circulation system of the cutting machine tool, and the cutting fluid is circulated by pumping. DETAILED DESCRIPTION

[0018] For ease of understanding of the present invention, the present invention will be described more fully below with reference to the embodiments, and preferred embodiments of the present invention are given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. It should be understood that the experimental methods in the following examples that do not specify specific conditions are usually based on conventional conditions or the conditions recommended by the manufacturer. The various commonly used reagents used in the embodiments are all commercially available products.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] The following is a description with reference to specific implementation methods.

[0021] Example 1

[0022] The present embodiment provides an aqueous semi-synthetic cutting fluid, comprising the following raw materials in mass fractions: 27% of cycloalkyl base oil, 1.5% of surfactant (sodium dodecylbenzene sulfonate), 2% of emulsifier (fatty acid amide polyoxyethylene ether), 3% of oleic acid, 1% of sodium sulfonate, 2% of bactericide (parachloro-meta-dimethylphenol), 3% of glycerol, 0.5% of defoamer (methyl silicone oil), 1% of corrosion inhibitor (lauryl phosphate), 2% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in a mass ratio of 2:1:0.2.

[0023] Example 2

[0024] The present embodiment provides an aqueous semi-synthetic cutting fluid, comprising the following raw materials in mass fractions: 32% of cycloalkyl base oil, 1.5% of surfactant (sodium dodecylbenzene sulfonate), 2% of emulsifier (fatty acid amide polyoxyethylene ether), 3% of oleic acid, 1% of sodium sulfonate, 2% of bactericide (parachloro-meta-dimethylphenol), 3% of glycerol, 0.5% of defoamer (methyl silicone oil), 1% of corrosion inhibitor (lauryl phosphate), 3% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, dibutylhydroxytoluene and citric acid in a mass ratio of 3:1:0.5.

[0025] Example 3

[0026] The present embodiment provides an aqueous semi-synthetic cutting fluid, comprising the following raw materials in mass fractions: 25% of cycloalkyl base oil, 1.5% of surfactant (sodium dodecylbenzene sulfonate), 2% of emulsifier (fatty acid amide polyoxyethylene ether), 3% of oleic acid, 1% of sodium sulfonate, 2% of bactericide (parachloro-meta-dimethylphenol), 3% of glycerol, 0.5% of defoamer (methyl silicone oil), 1% of corrosion inhibitor (lauryl phosphate), 1.5% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, dibutylhydroxytoluene and citric acid in a mass ratio of 1:1:0.3.

[0027] Example 4

[0028] The present embodiment provides an aqueous semi-synthetic cutting fluid, comprising the following raw materials in mass fractions: 30% of cycloalkyl base oil, 1.5% of surfactant (sodium dodecylbenzene sulfonate), 2% of emulsifier (fatty acid amide polyoxyethylene ether), 2% of oleic acid, 1% of sodium sulfonate, 2% of bactericide (parachloro-meta-dimethylphenol), 3% of glycerol, 0.5% of defoamer (methyl silicone oil), 0.5% of corrosion inhibitor (lauryl phosphate), 2% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in a mass ratio of 1.5:1:0.2.

[0029] Example 5

[0030] The present embodiment provides an aqueous semi-synthetic cutting fluid, comprising the following raw materials in mass fractions: 25% of cycloalkyl base oil, 2% of surfactant (sodium dodecylbenzene sulfonate), 2% of emulsifier (fatty acid amide polyoxyethylene ether), 3% of oleic acid, 1% of sodium sulfonate, 2% of bactericide (parachloro-meta-dimethylphenol), 5% of glycerol, 0.5% of defoamer (methyl silicone oil), 1% of corrosion inhibitor (lauryl phosphate), 2% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, dibutylhydroxytoluene and citric acid in a mass ratio of 2.5:2:0.3.

[0031] Comparative Example 1

[0032] This comparative example provides an aqueous semi-synthetic cutting fluid, which is the same as Example 1 except that the rust inhibitor does not contain citric acid. It specifically includes the following raw materials in mass fraction: 27% cycloalkyl base oil, 1.5% surfactant (sodium dodecylbenzene sulfonate), 2% emulsifier (fatty acid amide polyoxyethylene ether), 3% oleic acid, 1% sodium sulfonate, 2% bactericide (parachloro-meta-dimethylphenol), 3% glycerol, 0.5% defoamer (methyl silicone oil), 1% corrosion inhibitor (lauryl phosphate), 2% rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine and butylated hydroxytoluene in a mass ratio of 2:1.

[0033] Comparative Example 2

[0034] This comparative example provides an aqueous semi-synthetic cutting fluid, which is the same as Example 1 except that the rust inhibitor does not contain butylated hydroxytoluene, and specifically comprises the following raw materials in mass fraction: 27% cycloalkyl base oil, 1.5% surfactant (sodium dodecylbenzene sulfonate), 2% emulsifier (fatty acid amide polyoxyethylene ether), 3% oleic acid, 1% sodium sulfonate, 2% bactericide (parachloro-meta-dimethylphenol), 3% glycerol, 0.5% defoamer (methyl silicone oil), 1% corrosion inhibitor (lauryl phosphate), 2% rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine and citric acid in a mass ratio of 2:0.2.

[0035] Comparative Example 3

[0036] This comparative example provides an aqueous semi-synthetic cutting fluid, which is the same as Example 1 except for the ratio of components in the rust inhibitor, and specifically includes the following raw materials in mass fraction: 27% cycloalkyl base oil, 1.5% surfactant (sodium dodecylbenzene sulfonate), 2% emulsifier (fatty acid amide polyoxyethylene ether), 3% oleic acid, 1% sodium sulfonate, 2% bactericide (parachloro-meta-dimethylphenol), 3% glycerol, 0.5% defoamer (methyl silicone oil), 1% corrosion inhibitor (lauryl phosphate), 2% rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, dibutylhydroxytoluene and citric acid in a mass ratio of 2:1:2.

[0037] The aqueous semi-synthetic cutting fluid of the above-mentioned embodiments and comparative examples can be prepared by the following method: (1) mixing a cycloalkyl base oil with a portion of water and stirring them uniformly at 30° C.; (2) adding a surfactant and continuing to stir at 30° C. until the emulsification is uniform; (3) adding the remaining water, emulsifier, oleic acid, sodium sulfonate, glycerol, defoamer, corrosion inhibitor and rust inhibitor, stirring at 30° C. until they are completely dissolved, thereby obtaining the aqueous semi-synthetic cutting fluid.

[0038] The following indicators and properties of the aqueous semi-synthetic cutting fluids prepared in Examples 1 to 5 and Comparative Examples 1 to 3 were tested according to the method in GB / T 6144-2010: appearance, pH value, anti-corrosion performance, anti-rust performance and cooling performance.

[0039] Fill in the test results in Table 1.

[0040] Table 1

[0041]

[0042] As can be seen from Table 1, the various indicators of the aqueous semi-synthetic cutting fluid of Example 1 of the present invention meet the technical indicator requirements of GB / T6144-2010 and have excellent anti-corrosion performance. The various indicators of the aqueous semi-synthetic cutting fluids of Examples 2 to 5 of the present invention are similar to those of Example 1, and the specific data are omitted. The present invention compounded suitable raw materials so that the cutting fluid has good comprehensive properties such as lubricity, cooling, anti-corrosion and anti-rust performance.

[0043] Compared with Example 1, the rust inhibitor of the cutting fluid in Comparative Example 1 does not contain citric acid, the rust inhibitor of the cutting fluid in Comparative Example 2 does not contain butylated hydroxytoluene, and the amount of citric acid used in the rust inhibitor of the cutting fluid in Comparative Example 3 is too large, all of which lead to a decrease in the rust prevention performance of the cutting fluid. This shows that by adding a rust inhibitor obtained by compounding triethanolamine, butylated hydroxytoluene and citric acid in a specific mass ratio to the cutting fluid, the cutting fluid can obtain excellent rust prevention performance.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A water-based semi-synthetic cutting fluid, characterized in that: The invention comprises the following raw materials in mass fractions: 25% to 32% of cycloalkyl base oil, 1% to 3% of surfactant, 1% to 5% of emulsifier, 2% to 4% of oleic acid, 0.5% to 2.5% of sodium sulfonate, 1% to 5% of bactericide, 2% to 5% of glycerol, 0.2% to 0.5% of defoamer, 0.5% to 1.5% of corrosion inhibitor, 1% to 5% of rust inhibitor, and the balance is water; the rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in the mass ratio of (1 to 3): (1 to 2): (0.1 to 0.5).

2. The aqueous semi-synthetic cutting fluid according to claim 1, characterized in that: The rust preventive agent is composed of triethanolamine, dibutyl hydroxytoluene and citric acid in a mass ratio of (1.5-2.5): (1-1.5): (0.2-0.5).

3. The aqueous semi-synthetic cutting fluid according to claim 2, characterized in that: The rust inhibitor is composed of triethanolamine, butylated hydroxytoluene and citric acid in a mass ratio of 2:1:0.

2.

4. The aqueous semi-synthetic cutting fluid according to claim 1, characterized in that: The surfactant is selected from at least one of Tween-80, polyethylene glycol 400 and dodecylbenzene sulfonate.

5. The aqueous semi-synthetic cutting fluid according to claim 1, characterized in that: The emulsifier is selected from at least one of fatty acid amide polyoxyethylene ether, dodecyl polyoxyethylene ether triethanolamine sulfate, nonylphenol polyoxyethylene ether and sorbitan monooleate.

6. The aqueous semi-synthetic cutting fluid according to claim 1, characterized in that: The defoaming agent is selected from at least one of diethylhexanol, castor oil polyoxyethylene ether and methyl silicone oil.

7. The aqueous semi-synthetic cutting fluid according to claim 1, characterized in that: The corrosion inhibitor is selected from at least one of fatty alcohol ether phosphate, potassium salt of isotridecanol ether phosphate, lauryl phosphate and isotridecanol ether phosphate.

8. The method for preparing an aqueous semi-synthetic cutting fluid according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: (1) mixing cycloalkyl base oil with part of water and stirring evenly; (2) adding surfactant and continuously stirring until emulsification is evenly achieved; (3) adding the remaining water, emulsifier, oleic acid, sodium sulfonate, glycerin, defoamer, corrosion inhibitor and rust inhibitor and stirring until they are completely dissolved.

9. The method for preparing an aqueous semi-synthetic cutting fluid according to claim 8, characterized in that: The stirring temperature is 30°C to 40°C.

10. Use of the aqueous semi-synthetic cutting fluid according to any one of claims 1 to 7 in metal processing.

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