A method for preparing a long-life magnesium alloy cutting fluid

Abstract

The invention discloses a method for preparing a long-life magnesium alloy cutting fluid, wherein the cutting fluid is mixed and prepared according to specific steps according to material activity and reaction mechanism, and mainly comprises mineral oil, oil-soluble functional components, fatty alcohol EO-PO block copolymer, defoamer and water. The oil-soluble functional components have excellent lubrication properties, can effectively reduce the wear caused by the cutting process, and form a stable and dense protective film on the surface of the magnesium alloy, and cooperate with the fatty alcohol EO-PO block copolymer to achieve the compatibility of each component, so that each component can penetrate and interact with each other, thereby improving the stability, cleaning and hard water resistance of the cutting fluid, thereby effectively extending its service life, reducing the frequency of daily maintenance and replacement, reducing costs, and improving production efficiency.

Description

Technical Field

[0001] The invention relates to the field of metalworking fluids, and in particular to a method for preparing a long-life magnesium alloy cutting fluid. Background Art

[0002] Metal cutting fluid is a kind of metalworking fluid. It plays the role of lubrication, cooling, and preventing metal fragments from adhering during the cutting process, reducing wear during use, thereby ensuring the accuracy and finish of the processing. Therefore, the use of cutting fluid is quite necessary. In the processing of magnesium alloys, magnesium and its alloys are chemically active and easily react with water, amines, etc. in the cutting fluid. They are prone to blackening and corrosion during the processing. In addition, traditional magnesium alloy cutting fluids have poor resistance to hard water. With the precipitation of magnesium ions, the hardness of the cutting fluid increases, which eventually leads to stratification and corruption of the cutting fluid, shortening the service life of the cutting fluid. Basically, it has to be replaced every half a month, which increases the cost of processing. Secondly, the shutdown during the fluid change will also lead to a decrease in the machine operating rate, which in turn leads to a decrease in production capacity. Therefore, how to prepare a cutting fluid that meets the basic performance while improving the hard water resistance and extending the service life is a major research direction at present. Summary of the invention

[0003] In order to overcome the technical problems existing in the prior art, the present invention first provides a method for preparing a long-life magnesium alloy cutting fluid, which is mixed and prepared according to specific steps based on the activity of the materials and the reaction mechanism, so that the components can penetrate and interact with each other, thereby improving the stability, cleaning and hard water resistance of the cutting fluid, thereby effectively extending its service life.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] The present invention provides a method for preparing a long-life magnesium alloy cutting fluid, the method comprising the following steps:

[0006] S1. After preparing all components according to mass percentage, take 3 / 4 of mineral oil and add it into the reactor, set the temperature to 30-40°C, stir at 50-70rpm, and stir for 10-20min;

[0007] S2. Add oil-soluble functional ingredients, increase the speed to 100-120 rpm, and continue stirring for 30-40 minutes to obtain material 1;

[0008] S3, at room temperature, take another 1 / 4 portion of mineral oil, fatty alcohol EO-PO block copolymer and an appropriate amount of water and mix them in a reaction kettle, and stir at a variable speed to obtain material 2;

[0009] S4, add defoamer to material 2, then slowly pour material 1 into material 2, stir for 8-16 minutes at 25°C and 60-80rpm, and heat and stir at variable speed;

[0010] S5. Adjust the rotation speed to 50-70 rpm, slowly add triethanolamine to adjust the pH value, keep the rotation speed unchanged and stir until the solution becomes transparent, then stop stirring and let it stand and cool to room temperature to obtain the cutting fluid.

[0011] Preferably, the variable speed stirring in step S3 is to first stir at a speed of 50 to 60 rpm for 10 to 20 min, then increase the speed to 120 to 160 rpm and stir for 30 to 40 min.

[0012] Preferably, the temperature-increasing and speed-changing stirring in step S4 is to increase the temperature by 1° C. per minute and increase the rpm by 2 rpm per minute, stirring continuously for 35 to 45 minutes, and then stirring at a constant temperature for 10 to 20 minutes.

[0013] Preferably, the pH value in step S5 is 8.5-8.7.

[0014] Preferably, the components in the cutting fluid are 40-50% mineral oil, 16-28% oil-soluble functional components, 4-6% fatty alcohol EO-PO block copolymer, 0.8-1.2% defoamer and 30% water in percentage by mass.

[0015] Preferably, the preparation method of the oil-soluble functional ingredient is:

[0016] At room temperature, rapeseed oleic acid, soybean oleic acid and palmitic acid are fully mixed, heated and stirred at a speed of 50-70 rpm to 55-65° C., alkyl ether carboxylic acid is added, and the speed is kept unchanged and stirred for 10-20 minutes, then sebacic acid and phosphate are added, the speed is increased to 120-140 rpm, stirred for 30-40 minutes, and kept warm at 40-50° C. for 20-30 minutes to obtain oil-soluble functional ingredients.

[0017] Preferably, the components in the oil-soluble functional ingredients are 5 to 9 parts of rapeseed oleic acid, 1.2 to 2.4 parts of soybean oleic acid, 1.7 to 3.5 parts of palmitic acid, 7 to 9 parts of alkyl ether carboxylic acid, 4 to 8 parts of sebacic acid and 6 to 12 parts of phosphate ester in parts by weight.

[0018] Beneficial effects of the present invention:

[0019] The invention discloses a method for preparing a long-life magnesium alloy cutting fluid. The cutting fluid is mixed according to specific steps based on material activity and reaction mechanism, and mainly includes mineral oil, oil-soluble functional components, fatty alcohol EO-PO block copolymer, defoamer and water. The preparation process is simple and easy.

[0020] Mineral oil is used as the base, and the oil-soluble functional components are processed by a specific process from rapeseed oleic acid, soybean oleic acid, palmitic acid, alkyl ether carboxylic acid, sebacic acid and phosphate. In addition to excellent lubrication and rust prevention properties, a variety of natural oil components support each other to form a stable system. The use of alkyl ether carboxylic acid can enhance the dispersibility and lubricity of the cutting fluid, sebacic acid can adjust the viscosity and stability of the cutting fluid, and phosphate further enhances its efficacy. The synergistic effect of multiple functional components can effectively reduce the wear caused by the cutting process, and at the same time form a stable and dense protective film on the surface of the magnesium alloy. The fatty alcohol EO-PO block copolymer and triethanolamine are used to achieve the compatibility of each component, and then the defoamer is added to prevent the performance of the cutting fluid from decreasing due to foam, maintain the uniform distribution of the cutting fluid, and allow the components to penetrate and interact with each other, thereby improving the stability, cleaning and hard water resistance of the cutting fluid, thereby effectively extending its service life, reducing the frequency of daily maintenance and replacement, reducing costs, improving the processing quality and surface finish of the workpiece, and improving production efficiency. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1.

[0023] A long-life magnesium alloy cutting fluid. The preparation method of the cutting fluid in this embodiment comprises the following steps:

[0024] S1. After preparing all components according to mass percentage, take 3 / 4 of mineral oil and add it into the reactor, set the temperature to 35°C, stir at 60 rpm, and stir for 15 min;

[0025] S2, add oil-soluble functional ingredients, increase the speed to 110 rpm, and continue stirring for 35 minutes to obtain material 1;

[0026] S3, at room temperature, take another 1 / 4 portion of mineral oil, fatty alcohol EO-PO block copolymer and the rest of water in a reaction kettle, stir at 55 rpm for 15 min, increase the speed to 140 rpm, and stir for 35 min to obtain material 2;

[0027] S4, add three-dimensional silicone defoamer to material 2, then slowly pour material 1 into material 2, stir for 12 minutes at 25°C and 70 rpm, increase the temperature by 1°C per minute and increase the rpm by 2 rpm per minute, continue stirring for 40 minutes, and then stir at a constant temperature for 15 minutes;

[0028] S5. Adjust the speed to 60 rpm, slowly add triethanolamine to adjust the pH value to 8.6, keep the speed unchanged and stir slowly until the solution becomes transparent, then stop stirring, let it stand and cool to room temperature to obtain the cutting fluid.

[0029] The components in the cutting fluid of this embodiment are 40% mineral oil, 16% oil-soluble functional components, 4% fatty alcohol EO-PO block copolymer, 0.8% three-dimensional silicone defoaming agent and the balance water, respectively, by mass percentage.

[0030] The preparation method of the oil-soluble functional component of this embodiment is:

[0031] At room temperature, rapeseed oleic acid, soybean oleic acid and palmitic acid were fully mixed, heated and stirred at 60 rpm to 60°C, alkyl ether carboxylic acid was added, the speed was kept constant and stirred for 15 minutes, then sebacic acid and phosphate were added, the speed was increased to 130 rpm, stirred for 35 minutes, and kept warm at 45°C for 25 minutes to obtain oil-soluble functional ingredients.

[0032] The components in the oil-soluble functional ingredients of this embodiment are respectively 7 parts of rapeseed oleic acid, 1.8 parts of soybean oleic acid, 2.6 parts of palmitic acid, 8 parts of alkyl ether carboxylic acid, 6 parts of sebacic acid and 9 parts of phosphate ester in parts by weight.

[0033] Example 2.

[0034] A long-life magnesium alloy cutting fluid. The preparation method of the cutting fluid in this embodiment comprises the following steps:

[0035] S1. After preparing all components according to mass percentage, take 3 / 4 of mineral oil and add it into the reactor, set the temperature to 35°C, stir at 60 rpm, and stir for 15 min;

[0036] S2, add oil-soluble functional ingredients, increase the speed to 110 rpm, and continue stirring for 35 minutes to obtain material 1;

[0037] S3, at room temperature, take another 1 / 4 portion of mineral oil, fatty alcohol EO-PO block copolymer and the rest of water in a reaction kettle, stir at 55 rpm for 15 min, increase the speed to 140 rpm, and stir for 35 min to obtain material 2;

[0038] S4, add three-dimensional silicone defoamer to material 2, then slowly pour material 1 into material 2, stir for 12 minutes at 25°C and 70 rpm, increase the temperature by 1°C per minute and increase the rpm by 2 rpm per minute, continue stirring for 40 minutes, and then stir at a constant temperature for 15 minutes;

[0039] S5. Adjust the speed to 60 rpm, slowly add triethanolamine to adjust the pH value to 8.6, keep the speed unchanged and stir slowly until the solution becomes transparent, then stop stirring, let it stand and cool to room temperature to obtain the cutting fluid.

[0040] The components in the cutting fluid of this embodiment are 50% mineral oil, 28% oil-soluble functional components, 6% fatty alcohol EO-PO block copolymer, 1.2% three-dimensional silicone defoaming agent and the balance water, respectively, by mass percentage.

[0041] The preparation method of the oil-soluble functional component of this embodiment is:

[0042] At room temperature, rapeseed oleic acid, soybean oleic acid and palmitic acid were fully mixed, heated and stirred at 60 rpm to 60°C, alkyl ether carboxylic acid was added, the speed was kept constant and stirred for 15 minutes, then sebacic acid and phosphate were added, the speed was increased to 130 rpm, stirred for 35 minutes, and kept warm at 45°C for 25 minutes to obtain oil-soluble functional ingredients.

[0043] The components in the oil-soluble functional ingredients of this embodiment are respectively 7 parts of rapeseed oleic acid, 1.8 parts of soybean oleic acid, 2.6 parts of palmitic acid, 8 parts of alkyl ether carboxylic acid, 6 parts of sebacic acid and 9 parts of phosphate ester in parts by weight.

[0044] Example 3.

[0045] A long-life magnesium alloy cutting fluid. The preparation method of the cutting fluid in this embodiment comprises the following steps:

[0046] S1. After preparing all components according to mass percentage, add 3 / 4 of mineral oil into the reactor, set the temperature to 35°C, stir at 60 rpm, and stir for 15 min;

[0047] S2, add oil-soluble functional ingredients, increase the speed to 110 rpm, and continue stirring for 35 minutes to obtain material 1;

[0048] S3, at room temperature, take another 1 / 4 portion of mineral oil, fatty alcohol EO-PO block copolymer and the rest of water in a reaction kettle, stir at 55 rpm for 15 min, increase the speed to 140 rpm, and stir for 35 min to obtain material 2;

[0049] S4, add three-dimensional silicone defoamer to material 2, then slowly pour material 1 into material 2, stir for 12 minutes at 25°C and 70 rpm, increase the temperature by 1°C per minute and increase the rpm by 2 rpm per minute, continue stirring for 40 minutes, and then stir at a constant temperature for 15 minutes;

[0050] S5. Adjust the speed to 60 rpm, slowly add triethanolamine to adjust the pH value to 8.6, keep the speed unchanged and stir slowly until the solution becomes transparent, then stop stirring, let it stand and cool to room temperature to obtain the cutting fluid.

[0051] The components in the cutting fluid of this embodiment are 45% mineral oil, 22% oil-soluble functional components, 5% fatty alcohol EO-PO block copolymer, 1% three-dimensional silicone defoaming agent and the balance water, respectively, by mass percentage.

[0052] The preparation method of the oil-soluble functional component of this embodiment is:

[0053] At room temperature, rapeseed oleic acid, soybean oleic acid and palmitic acid were fully mixed, heated and stirred at 60 rpm to 60°C, alkyl ether carboxylic acid was added, the speed was kept constant and stirred for 15 minutes, then sebacic acid and phosphate were added, the speed was increased to 130 rpm, stirred for 35 minutes, and kept warm at 45°C for 25 minutes to obtain oil-soluble functional ingredients.

[0054] The components in the oil-soluble functional ingredients of this embodiment are respectively 7 parts of rapeseed oleic acid, 1.8 parts of soybean oleic acid, 2.6 parts of palmitic acid, 8 parts of alkyl ether carboxylic acid, 6 parts of sebacic acid and 9 parts of phosphate ester in parts by weight.

[0055] Comparative Example 1.

[0056] The difference from Example 3 is that no fatty alcohol EO-PO block copolymer is added.

[0057] Comparative Example 2.

[0058] The difference from Example 3 is that phosphate ester is used instead of the oil-soluble functional component.

[0059] Comparative Example 3.

[0060] The difference from Example 3 is that the preparation method of the oil-soluble functional component is different, which is:

[0061] At room temperature, rapeseed oleic acid, soybean oleic acid, palmitic acid, alkyl ether carboxylic acid, sebacic acid and phosphate are fully mixed to obtain an oil-soluble functional component.

[0062] 5000ppm magnesium hard water was prepared in a measuring cylinder using the chemical reagent Mg2SO4·7H2O and tap water. The magnesium alloy cutting fluids of Examples 1-3 and Comparative Examples 1-3 were used to prepare a 10% by mass 5000ppm magnesium hard water dilution. The appearance of the dilution was observed after being left at room temperature for 48 hours and after being tested on a machine for 3 months. The results are shown in Table 1.

[0063] Table 1

[0064]

[0065] As can be seen from Table 1, the cutting fluid prepared in the present application, while ensuring other properties such as lubrication, will not show stratification and oil floating after standing for 48 hours. After 3 months of machine testing, it only shows a slightly white appearance, and the inside of the machine is clean and free of scale, indicating that it has excellent hard water stability and can effectively improve the hard water resistance of the cutting fluid, thereby extending the service life of the cutting fluid and optimizing the production process.

[0066] Comparison of Example 3 and Comparative Examples 1-3 shows that under the conditions of the process, components, and parameters of the present application, the prepared cutting fluid has better hard water resistance. Reducing or changing any component in the present application or simply mixing various components can not give full play to the efficacy of each component and achieve the organic coordination of each component. And comparing Examples 1-3 shows that the prepared cutting fluid implementation case 1 has the best hard water resistance, and the hard water resistance of Examples 2-3 is slightly weakened, but other properties are also excellent. The preparation process of the present application is simple and easy, with mineral oil as the base, adding oil-soluble functional components of a compounded variety of functional components, and then matching fatty alcohol EO-PO block copolymers, triethanolamine and defoamers, so that each component can penetrate and act on each other, improve the stability, cleaning and hard water resistance of the cutting fluid, and then effectively extend its service life, reduce the frequency of daily maintenance and replacement, reduce costs, improve the processing quality and surface finish of workpieces, and improve production efficiency.

[0067] Inspired by the above-mentioned ideal embodiments of the present invention, it should be pointed out that the technical scope of the present invention is not limited to the contents of the specification. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a long-life magnesium alloy cutting fluid, characterized in that: The preparation method of the cutting fluid comprises the following steps: S1. After preparing all components according to mass percentage, take 3 / 4 of mineral oil and add it into the reactor, set the temperature to 30-40°C, stir at 50-70rpm, and stir for 10-20min; S2. Add oil-soluble functional ingredients, increase the speed to 100-120 rpm, and continue stirring for 30-40 minutes to obtain material 1; S3, at room temperature, take another 1 / 4 portion of mineral oil, fatty alcohol EO-PO block copolymer and an appropriate amount of water and mix them in a reaction kettle, and stir at a variable speed to obtain material 2; S4, add defoamer to material 2, then slowly pour material 1 into material 2, stir for 8-16 minutes at 25°C and 60-80rpm, and heat and stir at variable speed; S5. Adjust the speed to 50-70 rpm, slowly add triethanolamine to adjust the pH value, keep the speed unchanged and stir until the solution becomes transparent, then stop stirring, let it stand and cool to room temperature to obtain the cutting fluid; The components of the cutting fluid are 40-50% mineral oil, 16-28% oil-soluble functional components, 4-6% fatty alcohol EO-PO block copolymer, 0.8-1.2% defoamer and 30% water by mass percentage; The preparation method of the oil-soluble functional component is as follows: at room temperature, rapeseed oleic acid, soybean oleic acid and palmitic acid are fully mixed, heated and stirred at a speed of 50 to 70 rpm to 55 to 65° C., alkyl ether carboxylic acid is added, the speed is kept unchanged and stirred for 10 to 20 minutes, sebacic acid and phosphate are added, the speed is increased to 120 to 140 rpm, stirred for 30 to 40 minutes, and kept warm at 40 to 50° C. for 20 to 30 minutes to obtain the oil-soluble functional component; The components in the oil-soluble functional ingredients are 5 to 9 parts of rapeseed oleic acid, 1.2 to 2.4 parts of soybean oleic acid, 1.7 to 3.5 parts of palmitic acid, 7 to 9 parts of alkyl ether carboxylic acid, 4 to 8 parts of sebacic acid and 6 to 12 parts of phosphate ester respectively in parts by weight.

2. The method for preparing a long-life magnesium alloy cutting fluid according to claim 1, characterized in that: The variable speed stirring in step S3 is to first stir at a speed of 50 to 60 rpm for 10 to 20 minutes, then increase the speed to 120 to 160 rpm and stir for 30 to 40 minutes.

3. The method for preparing a long-life magnesium alloy cutting fluid according to claim 1, characterized in that: The temperature-increasing variable speed stirring in step S4 is to increase the temperature by 1° C. per minute and increase the speed by 2 rpm per minute, stirring continuously for 35 to 45 minutes, and then stirring at a constant temperature for 10 to 20 minutes.

4. The method for preparing a long-life magnesium alloy cutting fluid according to claim 1, characterized in that: The pH value in step S5 is 8.5-8.7.

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