WO2022193773A1

WO2022193773A1 - Magnesium-lithium alloy cutting fluid and preparation method therefor

Info

Publication number: WO2022193773A1
Application number: PCT/CN2021/141127
Authority: WO
Inventors: 孙果洋; 汪小龙
Original assignee: 安美科技股份有限公司
Priority date: 2021-03-19
Filing date: 2021-12-24
Publication date: 2022-09-22
Also published as: CN113201385A

Abstract

Provided are a magnesium-lithium alloy cutting fluid and a preparation method therefor. The cutting fluid comprises the following components in parts by weight: 5-50 parts of a base oil, 5-20 parts of a self-emulsifying ester lubricant, 1-15 parts of a surfactant, 5-30 parts of an anti-rust agent, 5-10 parts of polyethylene glycol, 1-5 parts of a monobutyl ether coupling agent, 5-10 parts of an ether carboxylic acid, 0.01-0.1 part of a de-foaming agent, 1-3 parts of a bactericide, and an appropriate amount of water. By means of using the magnesium-lithium alloy cutting fluid, a magnesium-lithium alloy does not generate a knife grain during a cutting process, the electrochemical corrosion of the magnesium-lithium alloy can be efficiently inhibited, such that a workpiece is protected from oxidation and discoloration during a machining process.

Description

Magnesium-lithium alloy cutting fluid and preparation method thereof

technical field

The invention relates to the technical field of cutting fluid, in particular to a magnesium-lithium alloy cutting fluid and a preparation method thereof.

Background technique

Magnesium-lithium alloy is the lightest metal structural material in the world, with good thermal conductivity, electrical conductivity and ductility, and has a wide range of applications in aerospace, national defense and military industries. With the increasing demands for lightweight, energy saving, environmental protection and sustainable development of structural materials in today's world, magnesium-lithium alloys also show broad application prospects in the fields of transportation, electronics, and medical products that require lightweight structural materials. The application of magnesium-lithium alloys in the pharmaceutical, chemical and aerospace industries will also grow. Due to the steady growth of the downstream terminal automobile consumption market, the compound annual growth rate (CAGR) is 20%-25% (including the application of magnesium-lithium alloys in transportation, 3C, aerospace and pharmaceutical and chemical fields).

Because it contains 14%-16% lithium, the magnesium-lithium alloy is prone to corrosion and discoloration of the primary battery in the presence of water electrolyte during the machining process of the magnesium-lithium alloy. The ordinary magnesium alloy cutting fluid on the market cannot meet the requirements. How to provide excellent corrosion resistance? It is an urgent problem to be solved at present to avoid defects such as corrosion and discoloration during the processing of magnesium-lithium alloys.

SUMMARY OF THE INVENTION

Based on this, the present invention provides a magnesium-lithium alloy cutting fluid with excellent corrosion resistance and lubricity, which can well avoid material corrosion during machining, improve quality and machining efficiency, and reduce defective rates.

The invention also provides a preparation method of the magnesium-lithium alloy cutting fluid, which is simple in operation and excellent in effect.

A magnesium-lithium alloy cutting fluid, comprising the following components in parts by weight: 5-50 parts of base oil, 5-20 parts of self-emulsifying ester lubricant, 1-15 parts of surfactant, 5-30 parts of rust inhibitor, polyethylene 5-10 parts of diol, 1-5 parts of monobutyl ether coupling agent, 5-10 parts of ether carboxylic acid, 0.01-0.1 part of defoaming agent, 1-3 parts of bactericide, appropriate amount of water.

In one embodiment, the rust inhibitor is selected from one or more of boric acid, C8-C12 monoacid and C8-C12 dibasic acid.

In one embodiment, the mass ratio of boronic acid, C8-C12 monoacid and C8-C12 diacid is 0.9-1.1:0.9-1.1:0.9-1.1.

In one embodiment, the C8-C12 phosphonate is one or more phosphonic acids selected from n-octyl phosphonate, isooctyl phosphonate, isononyl phosphonate, and decyl phosphonate Ester mixture, C8-C12 dibasic acid is dicarboxylate-based complex, sodium sebacic acid or mixed rust inhibitor of dodecanedibasic acid and undecandibasic acid, boric acid in magnesium-lithium alloy cutting fluid , C8-C12 phosphonates and C8-C12 dibasic acids in parts by weight: 5-10 parts of boric acid, 5-10 parts of C8-C12 phosphonates, and 5-10 parts of C8-C12 dibasic acids. 10 servings.

In one embodiment, the mass ratio of C8-C12 phosphonate and ether carboxylic acid is 1:1.

In one embodiment, the mass content of the total mass of C8-C12 phosphonate and ether carboxylic acid in the magnesium-lithium alloy cutting fluid is 10%-20%.

In one embodiment, the base oil is selected from the group consisting of 60N paraffinic base oil, 100N paraffinic base oil, 150N paraffinic base oil, -10°C naphthenic transformer oil, -20°C naphthenic transformer oil and -30°C One or more of naphthenic transformer oils; and/or,

The self-emulsifying ester lubricant is a trimer acid self-emulsifying ester; and/or,

The surfactant is selected from one or more of nonionic surfactants and anionic surfactants; and/or,

The monobutyl ether coupling agent is diethylene glycol monobutyl ether and/or ethylene glycol monobutyl ether.

In one embodiment, the nonionic surfactant is selected from one or more of AEO fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene and polypropylene ether; the anionic surfactant is sodium petroleum sulfonate.

The preparation method of above-mentioned magnesium-lithium alloy cutting fluid, comprises the following steps:

Mix the rust inhibitor, polyethylene glycol and water, and stir until the solid is completely dissolved to obtain a mixed solution;

The base oil, self-emulsifying ester lubricant, surfactant, monobutyl ether coupling agent, ether carboxylic acid, antifoaming agent and bactericide are put into the mixed solution and stirred evenly to obtain a magnesium-lithium alloy cutting fluid. .

The magnesium-lithium alloy cutting fluid of the present invention has the following beneficial effects:

(1) The magnesium-lithium alloy cutting fluid contains self-emulsifying esters, and its lubricity can reach or even exceed the level of emulsified oils on the market, ensuring that no knife lines are generated during the cutting process of magnesium-lithium alloys, and can well inhibit the electrochemistry of magnesium-lithium alloys. Corrosion occurs, so that the workpiece will not be oxidized and discolored during processing, which improves product quality and yield;

(2) C8-C12 phosphonate and ether carboxylic acid are added at the same time at a ratio of 1:1, and the effect of inhibiting the electrochemical corrosion of magnesium-lithium alloys is better when the total ratio is added to 10%-20%;

(3) The preparation method is simple and easy to operate, which is beneficial to popularization of production.

Description of drawings

FIG. 1 is a comparison diagram of the experimental results between the magnesium-lithium alloy cutting fluid of Example 1 and the commercially available magnesium-lithium alloy cutting fluid.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully below. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

The invention provides a magnesium-lithium alloy cutting fluid, comprising the following components in parts by weight: 5-50 parts of base oil, 5-20 parts of self-emulsifying ester lubricant, 1-15 parts of surfactant, and 5-30 parts of rust inhibitor parts, 5-10 parts of polyethylene glycol, 1-5 parts of monobutyl ether coupling agent, 5-10 parts of ether carboxylic acid, 0.01-0.1 part of defoamer, 1-3 parts of bactericide, and appropriate amount of water.

The usage amount of water is supplemented to 100 parts by weight according to the actual situation, and the general usage amount is 10-30 parts by weight.

Base oil is the basic material of magnesium-lithium alloy cutting fluid, and the carrier of each component provides a dispersing and dissolving environment for each component. The base oil can be selected from 60N paraffin base oil, 100N paraffin base oil, 150N paraffin base oil, One or more of -10°C naphthenic transformer oil, -20°C naphthenic transformer oil and -30°C naphthenic transformer oil.

Self-emulsifying ester lubricant is self-emulsifying ester, and its lubricity can reach or even surpass the level of emulsified oil on the market, ensuring that no knife lines are generated during the cutting process of magnesium-lithium alloy. Self-emulsifying ester lubricant is trimer acid self-emulsifying ester, which can Use but not limited to lubricants such as Croda 3955, 3952, 3954, Lubrizol's GY300 or similar materials on the market.

The surfactant is selected from one or more of nonionic surfactants and anionic surfactants, and the nonionic surfactants are selected from AEO fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene, organic alcohol amine and polypropylene One or more of ethers; the anionic surfactants are sodium petroleum sulfonate, oleic acid, etc.

The rust inhibitor can be selected from one or more of boric acid, C8-C12 phosphonate and C8-C12 dibasic acid. C8-C12 phosphonate refers to a phosphoric acid ester containing 8-12 carbon atoms , C8-C12 dibasic acid refers to the dibasic acid containing 8-12 carbon atoms. The phosphonates of C8-C12 are n-octanol phosphonates, isooctyl phosphonates, isononanol phosphonates, one or more phosphonate mixtures of decyl phosphonates, C8-C12 phosphonates Dibasic acids such as, but not limited to, dicarboxylate-based complexes, sodium sebacate, dodecanedioic acid and undecanoic acid mixed rust inhibitors, etc. Preferably, the phosphonate of C8-C12 is an octyl phosphonate, and the dicarboxylic acid of C8-C12 is selected as a dicarboxylate-based compound, in the rust inhibitor, the unit acid of boric acid, C8-C12 and C8- The mass ratio of the dibasic acid of C12 is 0.9-1.1:0.9-1.1:0.9-1.1.

In one embodiment, the content by weight of the mixture of boric acid, C8-C12 phosphonate and C8-C12 dibasic acid in the magnesium-lithium alloy cutting fluid is respectively: 5-10 parts of boric acid, C8-C12 phosphonate 5-10 parts, C8-C12 dibasic acid 5-10 parts.

In one embodiment, the mass ratio of C8-C12 phosphonate and ether carboxylic acid is 1:1. When used, the two components are added at the same time, and when the total mass of C8-C12 phosphonate and ether carboxylic acid is The mass content in the magnesium-lithium alloy cutting fluid is 10%-20%, which can well inhibit the electrochemical corrosion of the magnesium-lithium alloy, so that the workpiece will not be oxidized and discolored during processing.

The monobutyl ether coupling agent is diethylene glycol monobutyl ether and/or ethylene glycol monobutyl ether, which can adjust the high and low temperature stability of the product.

Fungicides can be selected from BK, MBM, BIT20 and other cutting fluid fungicides, which can prolong the service life of magnesium-aluminum alloy cutting fluids.

The defoamer can be selected from silicone 3D siloxane emulsion, such as Dow Corning's 1247/1267, Meng Qingxin's MS575, Lubrizol's 5674, etc., which can prevent foam overflow during product use.

S100: Mix the rust inhibitor, polyethylene glycol and water, and stir until the solid is completely dissolved to obtain a mixed solution.

The rust inhibitor and polyethylene glycol are water-soluble particles. The rust inhibitor and polyethylene glycol are completely dissolved in water, and other components are added to help the components to be mixed evenly and reduce excessive amounts during the stirring process. Mixing of components leads to problems of difficulty in dissolution.

S200: Put the base oil, self-emulsifying ester lubricant, surfactant, monobutyl ether coupling agent, ether carboxylic acid, defoamer and bactericide into the mixed solution, stir evenly, and obtain a magnesium-lithium alloy cutting fluid.

The above-mentioned method of using the magnesium-lithium alloy cutting fluid is to dilute the magnesium-lithium alloy cutting fluid with water to a mass concentration of 3%-10%, and then it is similar to the use procedure of the ordinary magnesium-lithium alloy cutting fluid, wherein the concentration of the magnesium-lithium alloy cutting fluid is: At 10wt%, the burr will be less or almost no than 5wt%, because the higher the concentration, the better the lubricity.

The magnesium-lithium alloy cutting fluid of the invention ensures that no knife lines are generated during the cutting process of the magnesium-lithium alloy, and can well suppress the electrochemical corrosion of the magnesium-lithium alloy, so that the workpiece will not be oxidized and discolored during the processing. The product quality and yield are improved, and the preparation method is simple and easy to operate, which is beneficial to popularization and production.

The following are examples of descriptions.

Example 1

The magnesium-lithium alloy cutting fluid of the present embodiment has a total weight of 100 parts, including the following components by weight:

5 parts of 60N paraffin base oil;

10 parts of Croda 3955 self-emulsifying ester lubricant;

Surfactant: 1 part of nonionic surfactant AEO9 (fatty alcohol polyoxyethylene ether), 5 parts of monoethanolamine;

Rust inhibitor: 5 parts of boric acid, 5 parts of sodium sebacate rust inhibitor, 5 parts of octylphosphonate ASI80 (Solvay);

5 parts of polyethylene glycol;

Monobutyl ether coupling agent: 1 part of ethylene glycol monobutyl ether;

5 parts of ether carboxylic acid;

0.01 part of silicone defoamer;

1 part of s-triazine fungicide BK;

water balance.

The use method of above-mentioned magnesium-lithium alloy cutting fluid is as follows:

The magnesium-lithium alloy cutting fluid is diluted with water to the required mass concentration,

Magnesium-lithium alloy CNC roughing, using concentration: 3%;

Magnesium-lithium alloy CNC finishing, using concentration: 6%.

Example 2

20 parts of 100N paraffin base oil;

5 parts of Croda 3952 self-emulsifying ester lubricant;

Surfactant: 1 part of fatty alcohol polyoxyethylene-polypropylene ether RT64 (Sasol), 10 parts of triethanolamine;

Anti-rust agent: 10 parts of boric acid, 10 parts of mixed anti-rust agent of dodecanediacid and undecanediacid, and 10 parts of alkyl phosphonate;

5 copies of polyethylene glycol PEG600;

Monobutyl ether coupling agent: 5 parts of ethylene glycol monobutyl ether;

10 parts of ether carboxylic acid;

Dow Corning 1247 Defoamer 0.1 part;

3 copies of BIT 20 fungicide;

water balance.

Magnesium-lithium alloy CNC roughing, using concentration: 5%;

Magnesium-lithium alloy CNC finishing, using concentration: 10%. .

Example 3

12 parts of 60N paraffin base oil;

20 parts of Croda 3954 self-emulsifying ester lubricant;

Surfactant: 3 parts of nonionic surfactant AEO9 (fatty alcohol polyoxyethylene ether), 5 parts of sodium petroleum sulfonate;

Rust inhibitor: 5 parts of boric acid, 7.5 parts of octylphosphonate ASI80 (Solvay), 7.5 parts of dicarboxylate-based compound;

10 parts of polyethylene glycol;

Monobutyl ether coupling agent: 1 part of diethylene glycol monobutyl ether;

8 parts of ether carboxylic acid;

Silicone defoamer Dow Corning 1267 0.05 parts;

Fungicide MBM 2 copies;

water balance.

Magnesium-lithium alloy CNC roughing, using concentration: 5%;

Magnesium-lithium alloy CNC finishing, using concentration: 10%.

Example 4

Base oil: 25 parts of -30 degree naphthenic transformer oil;

Self-emulsifying ester lubricant: 16 parts of Lubrizol's GY300;

Surfactant: 10 parts of fatty alcohol polyoxyethylene, 4 parts of sodium petroleum sulfonate;

Rust inhibitor: 6 parts of boric acid, 7 parts of alkyl phosphonate, 6 parts of sodium sebacate;

6 parts of polyethylene glycol;

Monobutyl ether coupling agent: 1 part of diethylene glycol monobutyl ether;

6 parts of ether carboxylic acid;

Silicone defoamer Dow Corning 1267 0.02 parts;

Fungicide MBM 1 copy;

water balance.

Magnesium-lithium alloy CNC roughing, using concentration: 5%;

Magnesium-lithium alloy CNC finishing, using concentration: 10%.

Example 5

Base oil: 31 parts of -10 degree naphthenic transformer oil;

Self-emulsifying ester lubricant: 8 parts of Lubrizol's GY300;

Surfactant: 2 parts of fatty alcohol polyoxyethylene, 5 parts of sodium petroleum sulfonate;

Rust inhibitor: 3 parts of boric acid, 2 parts of alkyl phosphonate, 2 parts of mixed rust inhibitor of dodecanedioic acid and undecanediacid;

8 parts of polyethylene glycol;

Monobutyl ether coupling agent: 3 parts of ethylene glycol monobutyl ether;

7 parts of ether carboxylic acid;

Silicone defoamer Dow Corning 1267 0.07 parts;

Fungicide MBM 2 copies;

water balance.

Magnesium-lithium alloy CNC roughing, using concentration: 5%;

Magnesium-lithium alloy CNC finishing, using concentration: 10%.

Example 6

Base oil: 42 parts of -20 degree naphthenic transformer oil;

Self-emulsifying ester lubricant: 6 copies of Croda 3955;

Surfactant: 1 part of AEO fatty alcohol polyoxyethylene ether;

Rust inhibitor: 5 parts of boric acid, 5 parts of alkyl phosphonate, 4 parts of sodium sebacate;

7 parts of polyethylene glycol;

Monobutyl ether coupling agent: 2 parts of diethylene glycol monobutyl ether;

8 parts of ether carboxylic acid;

Silicone defoamer Dow Corning 1267 0.1 part;

Fungicide MBM 1.5 copies;

water balance.

Magnesium-lithium alloy CNC roughing, using concentration: 5%;

Magnesium-lithium alloy CNC finishing, using concentration: 10%. .

The magnesium-lithium alloy cutting fluid of Example 1 and the commercially available magnesium-lithium alloy cutting fluid were used to polish the surface of the magnesium-lithium alloy material, with reference to the GB/T6144-2010 experimental standard, and the corrosion test conditions were 55°C*6h. The results are shown in Table 1.

Table 1

Wherein, the magnesium-lithium alloy cutting fluid of Example 1 and the commercially available magnesium-lithium alloy cutting fluid were used to polish the surface of the magnesium-lithium alloy material. The experimental results are shown in Figure 1. The left side is the magnesium-lithium alloy cutting fluid of Example 1 of the present invention. The right side is the commercially available magnesium-lithium alloy cutting fluid, it can be seen that the magnesium-lithium alloy cutting fluid of the present invention has better use effect than the commercially available magnesium-lithium alloy cutting fluid. The performance of the magnesium-lithium alloy cutting fluid of the present invention is not only free from the problem of surface knife lines, but also has no problems such as material corrosion.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiment only expresses an embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, 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 appended claims.

Claims

A magnesium-lithium alloy cutting fluid, characterized in that it comprises the following components in parts by weight: 5-50 parts of base oil, 5-20 parts of self-emulsifying ester lubricant, 1-15 parts of surfactant, and 5-30 parts of rust inhibitor parts, 5-10 parts of polyethylene glycol, 1-5 parts of monobutyl ether coupling agent, 5-10 parts of ether carboxylic acid, 0.01-0.1 part of defoamer, 1-3 parts of bactericide, and appropriate amount of water.
The magnesium-lithium alloy cutting fluid according to claim 1, wherein the rust inhibitor is selected from one or more of boric acid, C8-C12 phosphonate and C8-C12 dibasic acid.
The magnesium-lithium alloy cutting fluid according to claim 2, wherein the rust inhibitor is a mixture of boric acid, C8-C12 phosphonate and C8-C12 dibasic acid, wherein the boric acid, C8- The mass ratio of C12 phosphonate and C8-C12 dibasic acid is 0.9-1.1:0.9-1.1:0.9-1.1.
The magnesium-lithium alloy cutting fluid according to claim 3, wherein the content in parts by weight of the mixture of boric acid, C8-C12 phosphonate and C8-C12 dibasic acid in the magnesium-lithium alloy cutting fluid They are: 5-10 parts of boronic acid, 5-10 parts of C8-C12 dibasic acid, and 5-10 parts of C8-C12 phosphonate.
The magnesium-lithium alloy cutting fluid according to claim 2 or 3, wherein the C8-C12 phosphonate is n-octanol phosphonate, isooctyl phosphonate, isonononyl phosphonate, One or more phosphonate mixtures in decyl phosphonate, the dibasic acid of C8-C12 is dicarboxylate-based complex, sodium sebacic acid or dodecane dibasic acid and undecanoic acid Carbon dibasic acid mixed rust inhibitor.
The magnesium-lithium alloy cutting fluid according to claim 2 or 3, wherein the mass ratio of the C8-C12 phosphonate to ether carboxylic acid is 1:1.
The magnesium-lithium alloy cutting fluid according to claim 5, wherein the mass content of the total mass of the C8-C12 phosphonate and ether carboxylic acid in the magnesium-lithium alloy cutting fluid is 10%-20% %.
The magnesium-lithium alloy cutting fluid according to claim 1, wherein the base oil is selected from the group consisting of 60N paraffin base oil, 100N paraffin base oil, 150N paraffin base oil, -10°C naphthenic base oil, One or more of -20°C naphthenic transformer oil and -30°C naphthenic transformer oil; and/or,

The self-emulsifying ester lubricant is a trimer acid self-emulsifying ester; and/or,

The surfactant is selected from one or more of nonionic surfactants and anionic surfactants.
The magnesium-lithium alloy cutting fluid according to claim 7, wherein the nonionic surfactant is selected from one or more of AEO fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene and polypropylene ether ; Described anionic surfactant is sodium petroleum sulfonate.
The preparation method of the magnesium-lithium alloy cutting fluid according to any one of claims 1 to 8, characterized in that, comprising the following steps:

Mix the rust inhibitor, polyethylene glycol and water, and stir until the solid is completely dissolved to obtain a mixed solution;

The base oil, self-emulsifying ester lubricant, surfactant, monobutyl ether coupling agent, ether carboxylic acid, defoaming agent and bactericide are put into the mixed solution, and the mixture is stirred evenly to obtain a magnesium-lithium alloy cutting fluid.