An oil-in-water rust preventive emulsified oil and a method for producing the same

Abstract

The application discloses an oil-in-water type antirust emulsified oil and a preparation method thereof. The oil-in-water type antirust emulsified oil comprises the following components: lipophilic emulsifier 8.4-10.7 wt%; hydrophilic emulsifier 10.5-16.5 wt%; base oil 6.5-7.8 wt%; tap water 55-64 wt%; preservative 0.5-1.2 wt%; and antirust agent 5.0-8.8 wt%. The preparation method is as follows: the tap water, the lipophilic emulsifier, the hydrophilic emulsifier, the base oil, the antirust agent and the preservative are sequentially added into a beaker, and then mechanical stirring is carried out at a rotating speed of 60-100 n / min for 10-20 min at room temperature, so that the antirust emulsified oil is obtained. The antirust emulsified oil prepared by the application has superior emulsion stability and antirust performance.

Description

Technical Field

[0001] This invention belongs to the field of metalworking oils, specifically relating to an oil-in-water type rust-preventive emulsified oil and its preparation method. Background Technology

[0002] During metal cutting, the intense friction between the cutting tool and the metal generates a large amount of heat, which can easily cause thermal deformation of both the metal and the cutting tool. This leads to a decrease in workpiece machining accuracy and tool wear and deformation. Furthermore, during processing, transfer, and storage, environmental factors such as air and moisture can cause metal workpieces to rust and corrode. Currently, the main method used is to add an emulsion of rust-preventive emulsified oil and water during the cutting process to address issues such as rust prevention, lubrication, cooling, and cleaning. Currently available rust-preventive emulsified oils have a short rust-preventive period, are prone to spoilage, and can easily cause skin allergies and corrosion for operators. Furthermore, most rust-preventive emulsified oils use amine soaps and sodium soaps as emulsifiers, which easily form insoluble salts with magnesium and calcium ions in water or heavy metal ions from machining operations. This causes a certain amount of emulsifier deactivation and precipitation, leading to emulsion instability. Simultaneously, the precipitated insoluble soaps may cause system malfunctions. Moreover, the high base oil and emulsifier content in current rust-preventive emulsified oils results in high production costs. Additionally, the excessively high base oil content makes wastewater treatment difficult, causing serious environmental pollution.

[0003] Therefore, developing a rust-preventive emulsion oil whose emulsion stability is not affected by water hardness, is low-cost, environmentally friendly, and has better rust prevention, lubrication, cooling, and cleaning properties has become a research hotspot. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to address the shortcomings of existing technologies by providing a water-in-oil type rust-preventive emulsion and its preparation method. The water-in-oil type rust-preventive emulsion prepared by this invention has superior emulsion stability and rust-preventive performance.

[0005] Technical solution: A water-in-oil type rust-preventive emulsion, comprising the following components:

[0006] Lipophilic emulsifier: 8.4–10.7 wt%;

[0007] Hydrophilic emulsifier: 10.5–16.5 wt%;

[0008] Base oil: 6.5–7.8 wt%;

[0009] Tap water: 55-64 wt%;

[0010] Preservatives: 0.5–1.2 wt%;

[0011] Rust inhibitor: 5.0~8.8wt%.

[0012] Furthermore, the lipophilic emulsifier is N-butyryl-N-butyldodecanoic acid alkyl ester, wherein the alkyl group refers to a straight-chain alkyl group of C4 to C12.

[0013] Furthermore, the hydrophilic emulsifier is methyl allyl polyoxyethylene ether.

[0014] Furthermore, the base oil is 32. # Engine oil.

[0015] Furthermore, the preservative is dodecyl dimethyl benzyl ammonium chloride.

[0016] Furthermore, the rust inhibitor is N-propionyl-N-hexylhexadecanoic acid alkyl ester, wherein the alkyl group refers to a straight-chain alkyl group of C4 to C12.

[0017] Further, tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor and corrosion inhibitor are added to a beaker in sequence, and mechanically stirred at a speed of 60-100 rpm for 10-20 minutes at room temperature to obtain rust-preventive emulsified oil.

[0018] Beneficial effects:

[0019] 1) The rust-preventive emulsion prepared by this invention has excellent stability and rust-preventive performance.

[0020] 2) This invention uses amino acid surfactants as rust inhibitors and lipophilic emulsifiers, replacing the amine soaps and sodium soaps added to the rust-preventive emulsified oils currently on the market, thereby avoiding the influence of water hardness on the stability of the emulsified oil, and therefore there is no need to add water softeners.

[0021] 3) The base oil usage is low, and the amino acid surfactants have good biodegradability. The waste liquid generated after use is easy to treat, making it green and environmentally friendly with no environmental pollution problems.

[0022] 4) The formulated rust-preventive emulsified oil has a high water content and is an oil-in-water type, while most rust-preventive emulsified oils on the market and in patents are all-oil types. Therefore, the cost of the rust-preventive emulsified oil prepared by this patent is significantly reduced. The operation is simple, requiring only the raw materials to be added in sequence and then stirring. The operation time is short, no heating is required, and energy consumption is low. Moreover, the order of adding materials in this invention directly affects the type of rust-preventive emulsified oil (oil-in-water or water-in-oil), affecting the stability and rust-preventive performance of the final rust-preventive emulsified oil.

[0023] 5) The rust-preventive emulsified oil of the present invention has a high water content and excellent cooling and cleaning performance. Detailed Implementation

[0024] The technical solution of the present invention will be described in detail below through specific embodiments, but the scope of protection of the present invention is not limited to the embodiments described.

[0025] The lipophilic emulsifier in this invention is a self-made amino acid surfactant and its preparation method according to patent ZL 202310477024.5; the rust inhibitor N-propionyl-N-hexylhexadecanoic acid alkyl ester is prepared by a catalytic dehydrochlorination reaction of α-chlorohexadecanoic acid alkyl ester and N-hexylpropionamide. α-chlorohexadecanoic acid alkyl ester and N-hexylpropionamide are added to a reaction vessel at a molar ratio of 1:1.2, and a nano-HZSM-5 molecular sieve catalyst is added at a concentration of 0.5% of the total mass of α-chlorohexadecanoic acid alkyl ester and N-hexylpropionamide. The reaction is carried out at 60–80°C for 2–5 h. After the reaction, the catalyst is removed by filtration, the filtrate is allowed to stand and separate into layers, and the lower layer is taken out to obtain the amino acid surfactant N-propionyl-N-hexylhexadecanoic acid alkyl ester. The remaining raw materials—base oil, hydrophilic emulsifier, and preservative—are commercially available.

[0026] Example 1

[0027] Add 32g tap water, 4.2g lipophilic emulsifier N-butyroyl-N-butyl dodecyl ester, 7.5g hydrophilic emulsifier methyl allyl polyoxyethylene ether, and 3.5g base oil 32 # Engine oil, 2.5g of rust inhibitor N-propionyl-N-hexyl palmitate butyl ester, and 0.3g of corrosion inhibitor dodecyl dimethyl benzyl ammonium chloride were sequentially added to a beaker. The mixture was then mechanically stirred at 60 rpm for 10 minutes at room temperature to obtain the rust-preventive emulsified oil. The mass percentages of tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor, and corrosion inhibitor were 64%, 8.4%, 15.0%, 7.0%, 5.0%, and 0.6%, respectively.

[0028] Example 2

[0029] Add 30.25g tap water, 4.7g lipophilic emulsifier N-butyroyl-N-butyl dodecyl ester, 7.95g hydrophilic emulsifier methyl allyl polyoxyethylene ether, and 3.75g base oil 32. # Engine oil, 2.9g of rust inhibitor N-propionyl-N-hexyl palmitate, and 0.45g of corrosion inhibitor dodecyl dimethyl benzyl ammonium chloride were sequentially added to a beaker. The mixture was then mechanically stirred at 80 rpm for 20 minutes at room temperature to obtain the rust-preventive emulsified oil. The mass percentages of tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor, and corrosion inhibitor were 60.5%, 9.4%, 15.9%, 7.5%, 5.8%, and 0.9%, respectively.

[0030] Example 3

[0031] Add 27.5g tap water, 5.35g lipophilic emulsifier N-butyroyl-N-butyl dodecyl ester, 8.25g hydrophilic emulsifier methyl allyl polyoxyethylene ether, and 3.9g base oil 32 # Engine oil, 4.4g of rust inhibitor N-propionyl-N-hexylhexadecanoate, and 0.6g of corrosion inhibitor dodecyl dimethyl benzyl ammonium chloride were sequentially added to a beaker. The mixture was then mechanically stirred at 100 rpm for 15 minutes at room temperature to obtain the rust-preventive emulsified oil. The mass percentages of tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor, and corrosion inhibitor were 55.0%, 10.7%, 16.5%, 7.8%, 8.8%, and 1.2%, respectively.

[0032] Example 4

[0033] Add 29.0g tap water, 4.75g lipophilic emulsifier N-butyroyl-N-butyldodecyl hexyl ester, 8.0g hydrophilic emulsifier methyl allyl polyoxyethylene ether, and 3.75g base oil 32. # Engine oil, 4.0 g of rust inhibitor N-propionyl-N-hexylhexyl palmitate, and 0.5 g of corrosion inhibitor dodecyl dimethyl benzyl ammonium chloride were sequentially added to a beaker. The mixture was then mechanically stirred at 70 rpm for 10 min at room temperature to obtain the rust-preventive emulsified oil. The mass percentages of tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor, and corrosion inhibitor were 58.0%, 9.5%, 16.0%, 7.5%, 8.0%, and 1.0%, respectively.

[0034] Example 5

[0035] Add 30.25g tap water, 5.25g lipophilic emulsifier N-butyroyl-N-butyldodecyl ester, 8.0g hydrophilic emulsifier methyl allyl polyoxyethylene ether, and 3.25g base oil 32. # Engine oil, 3.0 g of rust inhibitor N-propionyl-N-hexyl palmitate octyl ester, and 0.25 g of corrosion inhibitor dodecyl dimethyl benzyl ammonium chloride were sequentially added to a beaker. The mixture was then mechanically stirred at 60 rpm for 20 min at room temperature to obtain the rust-preventive emulsified oil. The mass percentages of tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor, and corrosion inhibitor were 60.5%, 10.5%, 16.0%, 6.5%, 6.0%, and 0.5%, respectively.

[0036] The performance of the rust-preventive emulsified oils obtained in the examples was tested: the rust-preventive emulsified oils prepared in the examples were mixed with water to prepare emulsions with mass contents of 3%, 4%, and 5%, respectively. Emulsion stability testing method: 100 mL of the emulsion was dropped into a 100 mL burette using a pipette, and after 24 hours, stratification was observed. If stratification occurred, the percentage of the upper oil layer's volume relative to the volume of 100 mL of emulsion was calculated; the smaller this value, the better the emulsion stability. Emulsification ability was judged visually. Rust prevention performance testing method: The cast iron sheet was completely immersed in the prepared emulsion, then removed and placed at 25°C. o In the constant temperature chamber of C, the time required for rust spots to appear was observed. The longer the time, the better the rust prevention performance. The performance test results are shown in the table below:

[0037]

[0038] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A water-in-oil type rust-preventive emulsion, characterized in that, It consists of the following components: Lipophilic emulsifier: 8.4–10.7 wt%; the lipophilic emulsifier is N-butyryl-N-butyldodecanoyl ester, wherein the alkyl group refers to a straight-chain alkyl group of C4–C12. Hydrophilic emulsifier: 10.5–16.5 wt%; the hydrophilic emulsifier is methyl allyl polyoxyethylene ether; Base oil: 6.5–7.8 wt%; Tap water: 55-64 wt%; Preservative: 0.5-1.2 wt%; the preservative is dodecyl dimethyl benzyl ammonium chloride; Rust inhibitor: 5.0-8.8 wt%; the rust inhibitor is N-propionyl-N-hexylhexadecanoic acid alkyl ester, wherein the alkyl refers to a straight-chain alkyl group of C4-C12.

2. The water-in-oil type rust-preventive emulsified oil according to claim 1, characterized in that, The base oil is 32. # Engine oil.

3. The method for preparing the water-in-oil type rust-preventive emulsified oil according to claim 1 or 2, characterized in that, After adding tap water, oleophilic emulsifier, hydrophilic emulsifier, base oil, rust inhibitor and corrosion inhibitor to a beaker in sequence, mechanically stir at a speed of 60-100 rpm for 10-20 minutes at room temperature to obtain water-in-oil type rust-preventive emulsion.

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