Bio-based ferrous metal water-based cutting fluid and preparation method thereof
By preparing bio-based ferrous metal water-based cutting fluid, the environmental and health problems of traditional cutting fluid are solved, efficient and environmentally friendly lubricating and anti-rust effects are achieved, and cutting efficiency and tool life are improved.
Patent Information
- Application Number
- CN202510475790.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2025-07-18
AI Technical Summary
During use, existing metal cutting fluids have problems such as poor lubrication effect, corrosion, deposition, pollution of the operating environment, and skin allergies. Traditional cutting fluids are harmful to the environment and the human body, and it is difficult to meet the requirements of green development.
The bio-based ferrous metal water-based cutting fluid is used, including emulsifiers, co-emulsifiers, coupling agents, base oils, aqueous composite packages, lubricants and water. It is prepared through specific proportions and processes, and uses environmentally friendly biodegradable materials to improve rust prevention, hard water resistance and stability.
It achieves good anti-rust effect, hard water resistance and stability, reduces environmental pollution, improves cutting efficiency and tool life, and ensures the smoothness of the workpiece surface.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of lubricating oils, and relates to a bio-based aqueous cutting fluid for ferrous metals and a preparation method thereof. Background Art
[0002] Metal cutting fluid is an industrial medium used in industry, and is mainly used in large quantities during the cutting and grinding processes of metals. Metal working fluids are formulated by blending base oils and various compound additives, and should have good application performance according to the needs of the usage scenarios. Currently, at home and abroad, according to the composition and medium state of the working fluid, they are divided into two categories: oil-based and water-based. They each have their own advantages in different processing technologies. The former has excellent lubrication and rust prevention performance, while the latter has more superior cooling and cleaning performance.
[0003] Nowadays, due to the continuous improvement and innovation of cutting technologies, China has also stipulated more stringent development specifications for the characteristics of metal cutting fluids. In the past decade, the concept of green environmental protection has increasingly become the focus of the world, and people have paid more attention to health issues. At the same time, people have gradually realized that traditional metal cutting fluids will cause many adverse effects on the environment and the human body, and these effects will be irreversible in the long run. Therefore, international relevant organizations and developed countries have established relevant regulations and standards to require and restrict the use of metal cutting fluids and the treatment of waste liquids generated therefrom.
[0004] In order to adapt to the main trend of the world's development and the increasing requirements of society for metal cutting fluids, more and more countries have taken green cutting fluids as the main development direction and research target. The main characteristics of such green cutting fluids are as follows: (1) The dosage of mineral oil is gradually decreasing; (2) The application amount of oil-based cutting fluids is decreasing day by day, while the usage amount of water-based cutting fluids is increasing significantly; (3) The concept of developing metal cutting fluids is changing, from the original concept of only focusing on cutting performance and tool life to the development of green cutting fluids that have no damage to the environment and humans and have excellent performance.
[0005] During the use of metal cutting fluids, problems often occur for various reasons, which will affect the quality of processed parts, the physical health of operators, processing tools, and the service life of the cutting fluid itself. For example, an unreasonable formula of metal cutting fluid can lead to poor lubrication effect, corrosion, deposition, and pollution of the operating environment; the problem of oil aggregation on the surface of water-based metal cutting fluids; the foaming problem of metal cutting fluids; and the problem of skin allergies of operators. Due to various problems of cutting fluids and the need for the concept of green development, it is urgent to develop and research a metal cutting fluid that is friendly to the ecological environment. Summary of the Invention
[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a bio-based aqueous cutting fluid for ferrous metals and a preparation method thereof.
[0007] To achieve the object of the present invention, the following technical solutions are adopted in the present invention:
[0008] In a first aspect, the present invention provides a bio-based aqueous cutting fluid for ferrous metals, and the cutting fluid comprises an emulsifier, a co-emulsifier, a coupling agent, a base oil, an aqueous composite package, a lubricant and water;
[0009] The emulsifier is prepared by a method comprising the following steps: mixing rapeseed oleic acid with low erucic acid, diethanolamine, phosphoric acid and dibutyl p-cresol, and reacting with stirring to obtain the emulsifier.
[0010] The bio-based aqueous cutting fluid for ferrous metals prepared in the present invention has good rust prevention effect, hard water resistance, strong stability and little environmental pollution. The emulsifier prepared in the present invention has high biodegradability and good emulsifying property. Compared with traditional petroleum-based emulsifiers such as sodium petroleum sulfonate, it is easier to stabilize the stock solution. In addition to the emulsifying effect, the rust prevention effect of the stock solution is increased, so that the rust prevention performance of the product of the present invention is excellent. In addition, the emulsifier has excellent lubricating performance, rust prevention performance and corrosion resistance. It can improve the cutting efficiency and the service life of the cutting tool, and ensure the smoothness and quality of the workpiece surface, and is an essential part of the cutting fluid.
[0011] Preferably, the cutting fluid comprises 4-8 parts of emulsifier, 5-7 parts of co-emulsifier, 1-3 parts of coupling agent, 7-15 parts of base oil, 6-10 parts of aqueous composite package, 3-6 parts of lubricant and 55-65 parts of water by mass.
[0012] The mass parts of the emulsifier can be selected as 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5 parts, 5.2 parts, 5.5 parts, 5.8 parts, 6 parts, 6.2 parts, 6.5 parts, 6.8 parts, 7 parts, 7.2 parts, 7.5 parts, 7.8 parts, 8 parts, etc. The mass parts of the co-emulsifier can be selected as 5 parts, 5.2 parts, 5.5 parts, 5.8 parts, 6 parts, 6.2 parts, 6.5 parts, 6.8 parts, 7 parts, etc. The mass parts of the coupling agent can be selected as 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, etc. The mass parts of the base oil can be selected as 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, etc. The mass parts of the waterborne composite package can be selected as 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, etc. The mass parts of the lubricant can be selected as 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5 parts, 5.2 parts, 5.5 parts, 5.8 parts, 6 parts, etc. The mass parts of water can be selected as 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0013] Preferably, the end point of the reaction is: the acid value is not higher than 17 mg KOH / g.
[0014] Preferably, the mass ratio of the low erucic acid rapeseed oil fatty acid, diethanolamine, phosphoric acid and dibutyl p-cresol is (40 - 50):(50 - 55):(0.1 - 0.5):(0.1 - 0.5).
[0015] (40 - 50) The specific point values can be selected as 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, etc. (50 - 55) The specific point values can be selected as 50, 51, 52, 53, 54, 55, etc. (0.1 - 0.5) The specific point values can be selected as 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0016] Preferably, the temperature of the stirring is 40 - 50 °C and the time is 0.5 - 1 h.
[0017] The temperature can be selected as 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, etc., and the time can be selected as 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0018] Preferably, the temperature of the mixing is 100 - 200°C, such as 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0019] Preferably, the co-emulsifier includes tall oil Sylvatal D30LR.
[0020] The co-emulsifier tall oil Sylvatal D30LR is a bio-based modified additive, which is made from pine wood chips as raw materials through processes such as acidification, separation, and distillation. The main components, fatty acids and rosin acids, have little environmental pollution. Compared with oleic acid added by traditional co-emulsifiers, the product has better water hardness resistance. Tall oil is used in metalworking fluids in emulsions and microemulsions. As an auxiliary emulsifier, it can reduce the dosage of the main emulsifier. Compared with commonly used oleic acid, it has a faster emulsification speed, superior lubricity, good cleaning effect, and certain anti-foaming effect. It has a wide adaptability to hard water and good anti-acid spoilage property.
[0021] Both the emulsifier and the co-emulsifier are environmentally friendly compounds. Chemical surfactants are prone to accumulate in the environment and cause ecological toxicity, while bio-emulsifiers are easily biodegradable and will not accumulate in soil and water. The emulsifier prepared in the present invention has good emulsifying, dispersing, solubilizing and other characteristics, and has low toxicity and good compatibility with the human body and the environment.
[0022] Preferably, the coupling agent includes diethylene glycol monobutyl ether and tripropylene glycol methyl ether.
[0023] Preferably, the mass ratio of diethylene glycol monobutyl ether to tripropylene glycol methyl ether is (0.5 - 1):(0.5 - 1).
[0024] Specific point values in (0.5 - 1) can be selected as 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0025] The addition of the coupling agent improves the stability of the stock solution, makes the diluent clear and transparent, and has high emulsion stability. Diethylene glycol monobutyl ether is a commonly used solvent and is widely used in the chemical industry, mainly used as a solvent, resolvent, paint and resin additive, etc. In the present invention, it acts as a coupling agent and improves the stability of the stock solution. Tripropylene glycol methyl ether is a colorless to yellow liquid, soluble in most organic solvents. As a coupling agent, it helps the oil phase (lubricant) to mix with the water phase to form a stable emulsion, while enhancing lubricity and cooling performance.
[0026] Preferably, the aqueous composite package includes boric acid, monoethanolamine, and benzotriazole.
[0027] Preferably, the mass ratio of boric acid, monoethanolamine, and benzotriazole is (2 - 4):(4 - 5.5):(0.1 - 0.5).
[0028] Among them, the specific point values in (2 - 4) can be selected as 2, 2.4, 2.8, 3, 3.2, 3.5, 3.8, 4, etc., the specific point values in (4 - 5.5) can be selected as 4, 4.2, 4.5, 4.7, 5, 5.5, etc., the specific point values in (0.1 - 0.5) can be selected as 0.1, 0.2, 0.3, 0.4, 0.5, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0029] The aqueous composite package has good rust prevention effect and plays an important role in metal protection. Benzotriazole is mainly used as a water treatment agent, metal rust inhibitor, and corrosion inhibitor. It is widely used in circulating water treatment agents, rust-proof oils and greases, and also used as a vapor-phase corrosion inhibitor for copper and copper alloys, and a lubricating oil additive. In electroplating, it is used to surface purify silver, copper, and zinc and has an anti-discoloration effect. Benzotriazole forms covalent bonds and coordination bonds with copper atoms, and they alternately form a chain-like polymer with each other, forming a multi-layer protective film on the copper surface, so that the surface of the copper does not undergo oxidation-reduction reactions and does not generate hydrogen, playing an anti-corrosion role. The same effect can also be achieved on metal materials such as lead, cast iron, nickel, and zinc. Benzotriazole can be combined with a variety of corrosion inhibitors to improve the corrosion inhibition effect.
[0030] Preferably, the base oil includes naphthenic oil.
[0031] Preferably, the lubricant includes tetra-polyricinoleate.
[0032] The lubricant selected in the present invention has high biodegradability.
[0033] Preferably, the cutting fluid further includes an antibacterial agent and / or an antifoaming agent.
[0034] Preferably, the cutting fluid further includes 1 - 3 parts of an antibacterial agent and / or 0.1 - 0.3 parts of an antifoaming agent by mass.
[0035] The parts by mass of the antibacterial agent can be selected as 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, etc., and the parts by mass of the defoaming agent can be selected as 0.1 part, 0.2 part, 0.3 part, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0036] Preferably, the antibacterial agent includes MBM fungicide and / or BK fungicide.
[0037] Preferably, the defoaming agent includes polyether silicone BYK-028.
[0038] In a second aspect, the present invention provides a preparation method of the bio-based ferrous metal aqueous cutting fluid according to the first aspect, and the preparation method includes:
[0039] (1) Mix the aqueous composite package with water to obtain a first mixed solution;
[0040] (2) Mix the base oil, emulsifier, co-emulsifier, lubricant, coupling agent with the first mixed solution to obtain a second mixed solution;
[0041] (3) Mix the second mixed solution with water to obtain the product.
[0042] Adding water in portions is beneficial for better dissolution and improving the stability of the solution. The addition amount of water in step (1) is 33 - 37 parts, and the addition amount of water in step (3) is 20 - 28 parts.
[0043] Preferably, the temperature of the mixing in step (1) is 35 - 45°C, and the time is 0.5 - 1 h.
[0044] The temperature can be selected as 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, etc., and the time can be selected as 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0045] Preferably, the temperature of the mixing in step (2) is 50 - 60°C, and the time is 1 - 2 h.
[0046] The temperature can be selected as 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, etc., and the time can be selected as 1 h, 1.1 h, 1.2 h, 1.3 h, 1.4 h, 1.5 h, 1.6 h, 1.7 h, 1.8 h, 1.9 h, 2 h, etc. Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.
[0047] Preferably, the mixing time in step (3) is 1 - 2 h.
[0048] The time can be selected as 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h, 2h, etc. Other specific point values within the above numerical range can be selected and will not be elaborated one by one here.
[0049] Preferably, after being mixed with water in step (3), it further includes being mixed with an antibacterial agent and / or an antifoaming agent.
[0050] Preferably, the temperature for mixing with the antibacterial agent and / or the antifoaming agent is 10 - 30°C, and the time is 0.5 - 1h.
[0051] The temperature can be selected as 10°C, 12°C, 14°C, 16°C, 18°C, 20°C, 22°C, 24°C, 26°C, 28°C, 30°C, etc., and the time can be selected as 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h, etc. Other specific point values within the above numerical range can be selected and will not be elaborated one by one here.
[0052] Compared with the prior art, the present invention has the following beneficial effects:
[0053] 1. The emulsifier prepared by the present invention has good emulsifying property. Compared with traditional petroleum-based emulsifiers such as sodium petroleum sulfonate, it is easier to make the stock solution stable. In addition to having an emulsifying effect, it also increases the rust prevention effect of the stock solution, making the rust prevention performance of the products of the present invention excellent.
[0054] 2. The co-emulsifier Tall Oil Sylvatal D30LR selected by the present invention, compared with traditional co-emulsifiers such as oleic acid, ensures ecological friendliness while ensuring the stability and hard water resistance of the product.
[0055] 3. The mixed addition of the coupling agent in the present invention improves the stability of the stock solution system, and makes the diluted solution of the stock solution clear and transparent, with high emulsification stability.
[0056] 4. The core bio-emulsifier, co-emulsifier, and lubricant used in the present invention are all bio-based modified additives, with high biodegradability, which changes the environmental pollution and unsustainable problems caused by traditional petroleum-based emulsifiers / lubricants, etc. Detailed Embodiments
[0057] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.
[0058] The sources of the active ingredients contained in the products involved in the following embodiments and comparative examples are as follows (only the active ingredients are shown, and the necessary auxiliary ingredients contained in other commercially available raw materials will not be elaborated):
[0059] The low erucic acid rapeseed oil acid is a product named UFA-1865 purchased from Croda Sipo Chemical (Sichuan) Co., Ltd.;
[0060] The tall oil Sylvatal D30LR is a product named Sylvatal D30LR purchased from Kraton Polymer Trading (Shanghai) Co., Ltd.;
[0061] The tetra ricinoleic acid ester is a product named tetra ricinoleic acid ester purchased from Shandong Binzhou Jinsheng New Material Technology Co., Ltd.;
[0062] The polyether silicone type BYK-028 is a product named BYK BYK-028 water-based defoamer purchased from BYK;
[0063] The naphthenic oil is a product named K22 purchased from PetroChina Karamay Petrochemical Company;
[0064] The MBM fungicide is a product named Nipacide MBM purchased from Clariant Chemicals (China) Co., Ltd.;
[0065] The BK fungicide is a product named Nipacide BK purchased from Clariant Chemicals (China) Co., Ltd.;
[0066] The sodium petroleum sulfonate is a product named sodium petroleum sulfonate T702 purchased from Suzhou Hushuguan Chemical Additive Co., Ltd.;
[0067] AEO-3 (fatty alcohol polyoxyethylene ether-3) is a product purchased from Shell named 23-3;
[0068] The oleic acid is a product named oleic acid 7075 purchased from Jiangsu Huajia Energy Co., Ltd.;
[0069] The stearic acid is a product named stearic acid purchased from Nantong Kaita Co., Ltd.
[0070] Preparation Example 1
[0071] This preparation example provides a preparation method of an emulsifier, and the preparation method includes:
[0072] Add the low erucic acid rapeseed oil acid, diethanolamine, phosphoric acid and dibutyl p-cresol into the reaction kettle according to the mass ratio of 45:50:0.2:0.2. Under stirring conditions, heat the reactor to 185 °C, take samples every half an hour, and mix and react until the acid value reaches 17 mg KOH / g, then immediately cool down to 50 °C and stir for 0.5 hour to obtain.
[0073] Example 1
[0074] This embodiment provides a bio-based aqueous cutting fluid for ferrous metals. The cutting fluid, by mass fraction, comprises 6.1 parts of the emulsifier prepared in Preparation Example 1, 6.1 parts of tall oil Sylvatal D30LR, 0.7 part of diethylene glycol monobutyl ether, 0.7 part of tripropylene glycol methyl ether, 5 parts of tetra-polyricinoleate, 10 parts of naphthenic oil, 8 parts of an aqueous composite package, 0.2 part of polyether organosilicon type BYK-028, 1 part of MBM fungicide, 1.5 parts of BK fungicide, and 60.7 parts of water. The mass ratio of boric acid, monoethanolamine, and benzotriazole in the aqueous composite package is 2.9:4.8:0.2.
[0075] Its preparation method is as follows:
[0076] (1) Mix the aqueous composite package and water at 40 °C for 1 h to obtain a first mixed solution;
[0077] (2) Mix naphthenic oil, the emulsifier, tall oil Sylvatal D30LR, tetra-polyricinoleate, diethylene glycol monobutyl ether, tripropylene glycol methyl ether, and the first mixed solution at 55 °C for 1.5 h to obtain a second mixed solution;
[0078] (3) Stop heating. After mixing the second mixed solution and water for 1.5 h, mix the resulting product with MBM fungicide, BK fungicide, and polyether organosilicon type BYK-028 at 20 °C for 0.8 h to obtain the product.
[0079] Example 2
[0080] This embodiment provides a bio-based aqueous cutting fluid for ferrous metals. The cutting fluid, by mass fraction, comprises 5.1 parts of the emulsifier prepared in Preparation Example 1, 5.1 parts of tall oil Sylvatal D30LR, 0.4 part of diethylene glycol monobutyl ether, 0.8 part of tripropylene glycol methyl ether, 7 parts of naphthenic oil, 6 parts of tetra-polyricinoleate, 10 parts of an aqueous composite package, 1.5 parts of MBM fungicide, 1.5 parts of BK fungicide, 0.1 part of polyether organosilicon type BYK-028, and 63 parts of water. The mass ratio of boric acid, monoethanolamine, and benzotriazole in the aqueous composite package is 2:5.5:0.1.
[0081] Its preparation method is as follows:
[0082] (1) Mix the aqueous composite package and water at 35 °C for 0.5 h to obtain a first mixed solution;
[0083] (2) Mix naphthenic oil, the emulsifier, tall oil Sylvatal D30LR, tetra-polyricinoleate, diethylene glycol monobutyl ether, tripropylene glycol methyl ether, and the first mixed solution at 50 °C for 2 h to obtain a second mixed solution;
[0084] (3) Stop heating. After mixing the second mixture with water for 2 h, mix the resulting product with MBM fungicide, BK fungicide, and polyether silicone type BYK-028 at 10 °C for 1 h to obtain the product.
[0085] Example 3
[0086] This example provides a bio-based aqueous cutting fluid for ferrous metals. The cutting fluid includes, by mass, 7.1 parts of the emulsifier prepared in Preparation Example 1, 7 parts of tall oil Sylvatal D30LR, 1.4 parts of diethylene glycol monobutyl ether, 0.8 parts of tripropylene glycol methyl ether, 15 parts of naphthenic oil, 3 parts of tetra-polyricinoleic acid ester, 6 parts of aqueous composite package, 0.5 parts of MBM fungicide, 0.5 parts of BK fungicide, 0.3 parts of polyether silicone type BYK-028, and 58.6 parts of water. The mass ratio of boric acid, monoethanolamine, and benzotriazole in the aqueous composite package is 4:4:0.5.
[0087] Its preparation method is as follows:
[0088] (1) Mix the aqueous composite package with water at 45 °C for 0.8 h to obtain the first mixture.
[0089] (2) Mix the naphthenic oil, emulsifier, tall oil Sylvatal D30LR, tetra-polyricinoleic acid ester, diethylene glycol monobutyl ether, tripropylene glycol methyl ether with the first mixture at 60 °C for 1 h to obtain the second mixture.
[0090] (3) Stop heating. After mixing the second mixture with water for 1 h, mix the resulting product with MBM fungicide, BK fungicide, and polyether silicone type BYK-028 at 30 °C for 0.5 h to obtain the product.
[0091] Example 4
[0092] This example provides a bio-based aqueous cutting fluid for ferrous metals. The difference from Example 1 is only that tall oil Sylvatal D30LR is replaced with oleic acid in equal amounts, and other components and contents remain unchanged.
[0093] The preparation method refers to Example 1.
[0094] Example 5
[0095] This example provides a bio-based aqueous cutting fluid for ferrous metals. The difference from Example 1 is only that tall oil Sylvatal D30LR is replaced with stearic acid in equal amounts, and other components and contents remain unchanged.
[0096] The preparation method refers to Example 1.
[0097] Example 6
[0098] This example provides a bio-based aqueous cutting fluid for ferrous metals, which is only different from Example 1 in that it does not contain tripropylene glycol methyl ether, and the reduced mass is distributed to the mass of diethylene glycol monobutyl ether, while other components and their contents remain unchanged.
[0099] The preparation method refers to Example 1.
[0100] Example 7
[0101] This example provides a bio-based aqueous cutting fluid for ferrous metals, which is only different from Example 1 in that it does not contain diethylene glycol monobutyl ether, and the reduced mass is distributed to the mass of tripropylene glycol methyl ether, while other components and their contents remain unchanged.
[0102] The preparation method refers to Example 1.
[0103] Example 8
[0104] This example provides a bio-based aqueous cutting fluid for ferrous metals, which is only different from Example 1 in that "0.7 parts of diethylene glycol monobutyl ether and 0.7 parts of tripropylene glycol methyl ether" are replaced by "0.4 parts of dipropylene glycol monobutyl ether, 0.5 parts of dipropylene glycol monobutyl ether, and 0.5 parts of tripropylene glycol methyl ether", while other components and their contents remain unchanged.
[0105] The preparation method refers to Example 1.
[0106] Example 9
[0107] This example provides a bio-based aqueous cutting fluid for ferrous metals, which is only different from Example 1 in that "0.7 parts of diethylene glycol monobutyl ether and 0.7 parts of tripropylene glycol methyl ether" are replaced by "1.4 parts of dipropylene glycol monobutyl ether", while other components and their contents remain unchanged.
[0108] The preparation method refers to Example 1.
[0109] Comparative Example 1
[0110] This comparative example provides a bio-based aqueous cutting fluid for ferrous metals, which is only different from Example 1 in that the emulsifier prepared in Preparation Example 1 is replaced equally with sodium petroleum sulfonate, while other components and their contents remain unchanged.
[0111] The preparation method refers to Example 1.
[0112] Comparative Example 2
[0113] This comparative example provides a bio-based aqueous cutting fluid for ferrous metals, which is only different from Example 1 in that the emulsifier prepared in Preparation Example 1 is replaced equally with AEO-3, while other components and their contents remain unchanged.
[0114] The preparation method refers to Example 1.
[0115] Test Example 1
[0116] Stability test
[0117] Test method: Keep in an oven at 50 °C for 16 hours, observe the state of the stock solution, and place the sample to be tested at room temperature, and observe the state of the sample to be tested within 180 days.
[0118] Table 1
[0119] Group Status Example 1 Light yellow transparent liquid, without stratification Example 2 Light yellow transparent liquid, without stratification Example 3 Light yellow transparent liquid, without stratification Example 4 Light yellow liquid, turbid Example 5 Milky white liquid, turbid Example 6 Light yellow transparent liquid, becoming turbid after 30 days Example 7 Light yellow transparent liquid, becoming turbid after 60 days Example 8 Light yellow transparent liquid, becoming turbid after 90 days Example 9 Light yellow transparent liquid, becoming turbid after 90 days Comparative Example 1 Light yellow transparent liquid, becoming turbid after 180 days Comparative Example 2 Light brown transparent liquid, becoming turbid after 180 days
[0120] From the data in Table 1, it can be seen that the product prepared by the present invention has strong stability. The selection of co-emulsifier and coupling agent will affect the stability, and tripropylene glycol methyl ether and diethylene glycol monobutyl ether have a certain cooperative effect in improving the stability.
[0121] Test Example 2
[0122] Rust prevention
[0123] Test method: Refer to IP 287 / 01 and ASTM D4627 for testing. Take 2% dilution for testing, and observe the rust spot area on the filter paper to compare the rust prevention differences of different examples.
[0124] Table 2
[0125] Group Judgment criterion Rust grade Example 1 No rust Grade 0 Example 2 No rust Grade 0 Example 3 No rust Grade 0 Example 4 Slight rust (rust spot area 5%) Grade 1 Example 5 Medium rust (rust spot area 5 - 10%) Grade 2 Example 6 Slight rust (rust spot area 5%) Grade 1 Example 7 Slight rust (rust spot area 5%) Grade 1 Example 8 No rust Grade 0 Example 9 Slight rust (rust spot area 5%) Grade 1 Comparative Example 1 Severe rust (rust spot area > 10%) Grade 3 Comparative Example 2 Severe rust (rust spot area > 10%) Grade 3
[0126] From the data in Table 2, it can be seen that the cutting fluid prepared by the present invention has good rust prevention effect. The selection of emulsifier and co-emulsifier will affect the rust prevention effect, which proves that the specifically selected emulsifier and co-emulsifier of the present invention not only have high biodegradability but also good rust prevention performance.
[0127] Test Example 3
[0128] Defoaming property
[0129] Test method: Refer to GB / T6144-2010 for testing.
[0130] Table 3
[0131]
[0132]
[0133] From the data in Table 3, it can be seen that the product prepared by the present invention has good defoaming property. The specifically selected emulsifier and co-emulsifier of the present invention have good defoaming property.
[0134] Test Example 4
[0135] Hard water resistance
[0136] Static hard water resistance test method: Prepare aqueous solutions with hardness of 200 ppm and 500 ppm. Dilute the examples and comparative examples by 5% in hard water, stir evenly, let stand for 24 hours, and observe whether there is stratification, precipitation or oil separation. If the above situations do not occur, it is qualified.
[0137] Table 4
[0138] Group 200ppm 500ppm Example 1 Qualified Qualified Example 2 Qualified Qualified Example 3 Qualified Qualified Example 4 Unqualified Unqualified Example 5 Unqualified Unqualified Example 6 Qualified Qualified Example 7 Qualified Qualified Example 8 Qualified Qualified Example 9 Qualified Unqualified Comparative Example 1 Qualified Unqualified Comparative Example 2 Qualified Qualified
[0139] It can be seen from the data in Table 4 that the cutting fluid prepared by the present invention has good hard water resistance, and the selection of emulsifier and co-emulsifier will affect the hard water resistance of the product.
[0140] The applicant declares that the present invention uses the above examples to illustrate a bio-based aqueous cutting fluid for ferrous metals and its preparation method, but the present invention is not limited to the above examples, that is, it does not mean that the present invention must rely on the above examples to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent replacement of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.
[0141] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
[0142] In addition, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.
Claims
1. A bio-based aqueous cutting fluid for ferrous metals, characterized in that, The cutting fluid comprises an emulsifier, a co-emulsifier, a coupling agent, a base oil, an aqueous composite package, a lubricant and water; The emulsifier is prepared by a method comprising the following steps: mixing low erucic acid rapeseed oil, diethanolamine, phosphoric acid and dibutyl p-cresol, and reacting with stirring to obtain the emulsifier.
2. The water-based cutting fluid for ferrous metals based on biological materials according to claim 1, characterized in that, The cutting fluid comprises, by mass parts, 4-8 parts of the emulsifier, 5-7 parts of the co-emulsifier, 1-3 parts of the coupling agent, 7-15 parts of the base oil, 6-10 parts of the aqueous composite package, 3-6 parts of the lubricant and 55-65 parts of water.
3. The bio-based ferrous metal aqueous cutting fluid according to claim 1 or 2, characterized in that, The end point of the reaction is: the acid value is not higher than 17 mg KOH / g; Preferably, the mass ratio of the low erucic acid rapeseed oil, diethanolamine, phosphoric acid and dibutyl p-cresol is (40-50):(50-55):(0.1-0.5):(0.1-0.5); Preferably, the temperature of the stirring is 40-50 °C and the time is 0.5-1 h; Preferably, the temperature of the mixing is 100-200 °C; Preferably, the co-emulsifier comprises tall oil Sylvatal D30LR.
4. The water-based cutting fluid for ferrous metals based on biological materials according to any one of claims 1 to 3, characterized in that, The coupling agent comprises diethylene glycol monobutyl ether and tripropylene glycol methyl ether; Preferably, the mass ratio of the diethylene glycol monobutyl ether and the tripropylene glycol methyl ether is (0.5-1):(0.5-1); Preferably, the aqueous composite package comprises boric acid, monoethanolamine and benzotriazole; Preferably, the mass ratio of the boric acid, monoethanolamine and benzotriazole is (2-4):(4-5.5):(0.1-0.5).
5. The bio-based ferrous metal aqueous cutting fluid according to any one of claims 1-4, characterized in that, The base oil comprises naphthenic oil; Preferably, the lubricant is tetra-polymerized ricinoleic acid ester.
6. The water-based cutting fluid for ferrous metals based on biological substances according to any one of claims 1-5, characterized in that, The cutting fluid further comprises an antibacterial agent and / or an antifoaming agent; Preferably, the cutting fluid further comprises 1-3 parts of the antibacterial agent and / or 0.1-0.3 parts of the antifoaming agent by mass parts.
7. The water-based cutting fluid for ferrous metals based on biological substances according to claim 6, characterized in that, The antibacterial agent comprises MBM bactericide and / or BK bactericide; Preferably, the antifoaming agent comprises polyether silicone type BYK-028.
8. A preparation method of the bio-based ferrous metal aqueous cutting fluid according to any one of claims 1-7, characterized in that, The preparation method comprises: (1) Mixing the aqueous composite package with water to obtain a first mixed solution; (2) Mixing the base oil, the emulsifier, the co-emulsifier, the lubricant, the coupling agent with the first mixed solution to obtain a second mixed solution; (3) Mixing the second mixed solution with water to obtain the cutting fluid.
9. The preparation method according to claim 8, characterized in that, The temperature of the mixing in step (1) is 35-45 °C and the time is 0.5-1 h; Preferably, the temperature of the mixing in step (2) is 50-60 °C and the time is 1-2 h; Preferably, the time of the mixing in step (3) is 1-2 h.
10. The preparation method according to claim 8 or 9, characterized in that, After mixing with water in step (3), it further comprises mixing with the antibacterial agent and / or the antifoaming agent; Preferably, the temperature of mixing with the antibacterial agent and / or the antifoaming agent is 10-30 °C and the time is 0.5-1 h.