Environment-friendly multi-layer lubricating super-fine liquid

Abstract

The invention discloses an environment-friendly multi-layer lubricating ultra-fine liquid which comprises the following components in percentage by mass: 42-43% of nanoscale polyether ester and 12-13% of modified silicate are adopted to construct a multi-layer lubricating structure, and a self-repairing lubricating film is formed through intermolecular hydrogen-bond interaction; a compact passive film is formed on the surface of a workpiece by applying a gradient slow release system of organic ammonium carboxylate and a metal chelating agent, and the organic ammonium carboxylate accounts for 6%-7%, and the metal chelating agent accounts for 3.5%-4.5%; the immobilized lipase is adopted for catalytic synthesis of the special ester compound, green synthesis of key components is achieved, and Novozym435 is selected as the immobilized lipase; a sodium dihydrogen phosphate-disodium hydrogen phosphate buffer system is adopted as a pH buffer agent, and the sodium dihydrogen phosphate accounts for 1.8%-2.2%, and the disodium hydrogen phosphate accounts for 1.3%-1.7%; the lubricating oil is formed by a multi-layer lubricating structure and a compact passive film, equipment abrasion and corrosion are effectively reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of metalworking fluid technology, specifically relating to an environmentally friendly multilayer lubricating super-precision fluid. Background Technology

[0002] In recent years, with increasingly stringent global environmental regulations, higher environmental requirements have been placed on lubricating materials used in the machining industry. Especially in environmentally sensitive areas such as the Taihu Lake basin, problems such as cyanobacterial blooms have led to mandatory requirements for phosphorus-free lubricating materials, which directly forces the machining industry to innovate technologically.

[0003] Traditional superfinishing fluids typically rely on extreme pressure agents and lubricants containing sulfur, phosphorus, and chlorine to achieve their processing performance. While these additives can effectively improve lubrication, they also have drawbacks such as significant environmental pollution, strong equipment corrosiveness, and harm to operator health. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an environmentally friendly multilayer lubricating superfine fluid, comprising the following components by mass percentage: a multilayer lubricating structure constructed from nano-sized polyether ester and modified silicate, forming a self-healing lubricating film through intermolecular hydrogen bonding, wherein the nano-sized polyether ester comprises 42%-43% and the modified silicate 12%-13%; a gradient slow-release system of organic ammonium carboxylate and metal chelating agent is used to form a dense passivation film on the workpiece surface, wherein the organic ammonium carboxylate comprises 6%-7% and the metal chelating agent 3.5%-4.5%; a special ester compound is synthesized using immobilized lipase catalysis to achieve green synthesis of key components, wherein the immobilized lipase is Novozym435; a sodium dihydrogen phosphate-disodium hydrogen phosphate buffer system is used as a pH buffer, wherein sodium dihydrogen phosphate comprises 1.8%-2.2% and disodium hydrogen phosphate comprises 1.3%-1.7%; and deionized water is added to bring the balance to 100%.

[0005] Preferably, the purity of the nano-sized polyether ester is ≥99.5%, and the viscosity is 75±5 mPa·s.

[0006] Preferably, the modified silicate is obtained by reacting sodium silicate with an organosilicon coupling agent.

[0007] Preferably, the organic carboxylic acid ammonium is selected from ethylenediaminetetraacetic acid tetraammonium with a purity ≥99%; the metal chelating agent is selected from 8-hydroxyquinoline with a purity ≥98%.

[0008] Preferably, the Novozym435 enzyme activity is ≥10000 U / g.

[0009] A preferred method for preparing an environmentally friendly multilayer lubricating superfine fluid includes the following steps: S1. Preparation of a multilayer lubricating structure precursor; S2. Formation of a dense passivation film; S3. Preparation of nanoscale stable emulsions; S4. Special ester compounds are synthesized by immobilized lipase catalysis and then mixed with other components to obtain the final product.

[0010] Preferably, in the preparation process of the multilayer lubricating structure precursor, nano-sized polyether ester and modified silicate are stirred and mixed at 80°C for 2 hours, and then homogenized 5 times at 100MPa pressure for 3 minutes each time to form a multilayer lubricating structure with a particle size of 50-100nm.

[0011] Preferably, during the formation of the dense passivation film, ethylenediaminetetraacetic acid tetraammonium and 8-hydroxyquinoline are dissolved in deionized water, the workpiece is immersed in the solution and kept at 60°C for 30 minutes, and then treated with a pH buffer solution for 10 minutes.

[0012] Preferably, in the preparation process of the nanoscale stable emulsion, the lubricating component is mixed with other auxiliary lubricants in a ratio of 17:3, and treated at 40°C by a high-pressure shear emulsifier at a pressure of 50MPa and a shear rate of 10000rpm for 15 minutes to form an emulsion with a particle size of 100-200nm.

[0013] Preferably, in the synthesis of the special ester compound, stearic acid is used as a fatty acid precursor, and ethyl stearate is synthesized by reacting at 50°C for 24 hours under the catalysis of Novozym435 immobilized lipase.

[0014] The beneficial effects of this invention are as follows: Completely free of harmful substances such as sulfur, phosphorus, and chlorine, it significantly improves environmental performance, reduces pollution, avoids health hazards to operators, and improves the working environment. The multi-layered lubrication structure and the formation of a dense passivation film effectively reduce equipment wear and corrosion, extending equipment lifespan. The application of nano-level stable emulsion and self-healing lubrication film improves processing accuracy and efficiency, and reduces production costs.

[0015] In practical applications, bearing parts of the same specifications and materials were selected and processed using both traditional ultra-precision fluid and the environmentally friendly multi-layer lubricating ultra-precision fluid of this invention. After processing, the processing effect was evaluated by measuring parameters such as surface roughness and dimensional accuracy of the parts. The results showed that the surface roughness Ra value of the parts processed using the ultra-precision fluid of this invention was reduced by 20%, the dimensional accuracy was improved by 15%, and the noise during the processing was reduced by about 10 dB. This indicates that the ultra-precision fluid of this invention can significantly improve processing accuracy and efficiency, reduce production costs, and protect the environment and the health of operators. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the process steps of an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Example

[0019] The specific usage of each raw material, by weight percentage, is as follows: To prepare 1000g of environmentally friendly multilayer lubricating superfine fluid, prepare 420g of nano-grade polyether ester with a purity of 99.5% and a viscosity of 75±5mPa·s; 130g of modified silicate obtained by reacting sodium silicate with an organosilicon coupling agent; 70g of tetraammonium ethylenediaminetetraacetate with a purity of 99%; 45g of 8-hydroxyquinoline with a purity of 98%; 22g of sodium dihydrogen phosphate; 17g of disodium hydrogen phosphate; 10g of Novozym435 immobilized lipase; 100g of auxiliary lubricant; and 186g of deionized water. Example

[0020] Based on the mass percentage of each raw material in Example 1, a low-foaming grinding fluid was prepared: In preparing the multilayer lubricating structure precursor, the prepared nano-sized polyether ester and modified silicate were added to a reactor equipped with a stirrer and a temperature control device. The stirrer was turned on, and the mixture was stirred and mixed at 80°C for 2 hours to ensure thorough and uniform mixing. After stirring, the mixture was homogenized five times at 100 MPa pressure using a high-pressure homogenizer, with each homogenization lasting 3 minutes. This homogenization process resulted in a multilayer lubricating structure precursor with a particle size of 75 nm.

[0021] Weigh out tetraammonium ethylenediaminetetraacetate and 8-hydroxyquinoline, and dissolve them in an appropriate amount of deionized water to prepare a solution. Immerse the workpiece to be treated in the prepared solution, and then place the reaction system in a constant temperature water bath at 60°C for 30 minutes to allow the organic ammonium carboxylate and metal chelating agent to form a gradient slow-release system on the workpiece surface. After 30 minutes, remove the workpiece and immerse it in a pH buffer solution prepared with sodium dihydrogen phosphate and disodium hydrogen phosphate for 10 minutes to form a dense passivation film on the workpiece surface.

[0022] The multilayer lubricating component precursor and other auxiliary lubricants (4.0% fatty alcohol polyoxyethylene ether AEO-9 selected here) were mixed evenly at a mass ratio of 17:3. The mixed lubricating component and other auxiliary lubricants were added to a high-pressure shear emulsifier, and the mixture was cooled to 40°C by circulating water bath, and then transferred to the high-pressure shear emulsifier. The mixture was treated in the high-pressure shear emulsifier at a pressure of 50 MPa and a shear rate of 10,000 rpm for 15 minutes to form a nanoscale stable emulsion with a particle size of 150 nm.

[0023] Using stearic acid as a fatty acid precursor, a certain amount of stearic acid and Novozym435 immobilized lipase were added to a reaction vessel and reacted at 50°C for 24 hours to synthesize ethyl stearate. The amount of Novozym435 immobilized lipase was adjusted appropriately according to the reaction scale and enzyme activity. The prepared nanoscale stable emulsion, the synthesized ethyl stearate, and other possible additives were thoroughly mixed at a stirring speed of 300 rpm to obtain an environmentally friendly multilayer lubricating superfine liquid.

[0024] Finished product testing phase: The friction coefficient of the prepared environmentally friendly multilayer lubricating super-precision fluid was tested using a ring-block friction testing machine. The test conditions were: load of 100 N, rotation speed of 200 rpm, and test time of 60 minutes. The friction coefficient was recorded every 5 minutes. The results showed that the friction coefficient remained stable between 0.04 and 0.05, significantly lower than the friction coefficient of traditional super-precision fluids (0.1-0.15). This indicates that the super-precision fluid of this invention has excellent lubrication properties and can effectively reduce friction during processing.

[0025] A 45# steel workpiece coated with an environmentally friendly multi-layer lubricating super-precision fluid was placed in a neutral salt spray test chamber and subjected to a 72-hour continuous spray test according to GB / T10125-2012 standard. After the test, the workpiece was removed and its surface was visually inspected; no rust was observed. In contrast, workpieces not coated with this super-precision fluid showed significant rust after 24 hours under the same test conditions. This demonstrates that the super-precision fluid of this invention possesses excellent rust-preventive properties and can provide long-term effective protection for the workpiece.

[0026] The prepared environmentally friendly multilayer lubricating superfluid was tested for sulfur, phosphorus, and chlorine content. Inductively coupled plasma mass spectrometry (ICP-MS) was used for detection. The results showed that the sulfur, phosphorus, and chlorine contents were all below the detection limit (<1 ppm), fully complying with international environmental standards. This indicates that the superfluid of this invention is a truly environmentally friendly lubricating material.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly multi-layered lubricating super-finish fluid, characterized in that, By mass percentage, the following components are included: nano-scale polyether ester 42%-43%, modified silicate 12%-13% to build a multi-layer lubricating structure by intermolecular hydrogen bond to form a self-repairing lubricating film; organic carboxylic acid ammonium 6%-7%, metal chelating agent 3.5%-4.5% to form a dense passivation film on the surface of a workpiece by using a gradient slow-release system of organic carboxylic acid ammonium and metal chelating agent; immobilized lipase is used to catalyze the synthesis of special ester compounds to realize green synthesis of key components, wherein Novozym435 is selected as the immobilized lipase; sodium dihydrogen phosphate 1.8%-2.2%, sodium hydrogen phosphate 1.3%-1.7% are used as a pH buffer, and deionized water is added to 100% in the balance.

2. The environmentally friendly multi-layer lubricating super-finish fluid according to claim 1, characterized in that, The purity of the nano-scale polyether ester is ≥99.5%, and the viscosity is 75±5 mPa·s.

3. The environmentally friendly multi-layer lubricating super-finish fluid of claim 1, wherein the base oil is selected from the group consisting of mineral oil, synthetic oil, and a mixture thereof. The modified silicate is obtained by modifying sodium silicate with an organic silicon coupling agent.

4. The environmentally friendly multi-layered lubricating super-finish fluid of claim 1, wherein the base oil is selected from the group consisting of mineral oil, synthetic oil, and a mixture thereof. The organic carboxylic acid ammonium is selected as tetraammonium ethylenediaminetetraacetate with a purity ≥99%, and the metal chelating agent is selected as 8-hydroxyquinoline with a purity ≥98%.

5. The environmentally friendly multi-layered lubricating super-finished fluid of claim 1, wherein, The enzyme activity of the Novozym435 is ≥10000 U / g.

6. The method for preparing environmentally friendly multi-layer lubricating super finish fluid according to any one of claims 1-5, characterized in that, The following steps are included: S1. Preparation of a multi-layer lubricating structure precursor; S2. Formation of a dense passivation film; S3. Preparation of a nano-scale stable emulsion; S4. Synthesis of special ester compounds by immobilized lipase catalysis and mixing with other components to obtain a final product.

7. The production method according to claim 6, wherein In the preparation process of the multi-layer lubricating structure precursor, the nano-scale polyether ester and the modified silicate are stirred and mixed at 80℃ for 2 hours, and then homogenized by a high-pressure homogenizer at a pressure of 100 MPa for 5 times, each time for 3 minutes, to form a multi-layer lubricating structure with a particle size of 50-100 nm.

8. The preparation method according to claim 6, characterized in that, In the formation process of the dense passivation film, tetraammonium ethylenediaminetetraacetate and 8-hydroxyquinoline are dissolved in deionized water, and the workpiece is immersed in the solution at 60℃ for 30 minutes, and then treated with a pH buffer solution for 10 minutes.

9. The preparation method according to claim 6, characterized in that, In the preparation process of the nano-scale stable emulsion, the lubricating components and other auxiliary lubricants are mixed in a ratio of 17:3, and treated by a high-pressure shear emulsifier at a pressure of 50 MPa, a shear rate of 10000 rpm and a temperature of 40℃ for 15 minutes to form an emulsion with a particle size of 100-200 nm.

10. The method of claim 6, wherein, In the synthesis process of the special ester compounds, stearic acid is used as a fatty acid precursor, and stearic acid ethyl ester is synthesized by Novozym435 immobilized lipase catalysis at 50℃ for 24 hours.

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