CN113930280B - Diamond wire cooling liquid and preparation method and application thereof - Google Patents
Diamond wire cooling liquid and preparation method and application thereof Download PDFInfo
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/24—Emulsion properties
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
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Abstract
The invention relates to a diamond wire cooling liquid and a preparation method and application thereof. The invention takes water and polyether as main raw materials, the proportion of the polyether and the water is controlled, the surfactant is added in a matching way, in the using stage of the cooling liquid, the form of the microemulsion enables the emulsion to have good lubricating and cooling effects, in the recycling stage, the water-ether ratio in the cooling liquid changes, and the high molecular polyether gradually gathers into a high molecular state from an original micron-sized state, so that the filtering removal is facilitated in the filter pressing stage, and the technical purpose of convenient recycling is realized on the premise of ensuring the cooling and lubricating effects.
Description
Technical Field
The invention relates to the technical field of cutting fluid, in particular to diamond wire cooling fluid and a preparation method and application thereof.
Background
Diamond wire cutting is a cutting technology for slicing a metal wire wrapped with diamond under the condition of high-speed operation, has the advantages of high cutting speed, thin cutting seam, good surface quality and the like, and is an application technology which better meets the requirement of sustainable development. The diamond wire and the cooling liquid are the main factors playing a critical role in the cutting quality in the diamond wire cutting single-polycrystalline silicon wafer technology. If the two can not achieve good synergistic effect, various cutting failures and even wire breakage risks can be caused. The cooling liquid plays roles of lubricating, cooling, cleaning and the like in the cutting process, and simultaneously takes away silicon powder generated by cutting, so that the cutting can be smoothly carried out, and the high-quality silicon wafer is obtained. The cooling effect of the cutting fluid enables the whole diamond wire cutting process to be carried out under a low-temperature environment, but in the crystal silicon cutting process by using the diamond wire, crystal silicon is lost in the form of silicon powder, and is mixed in the cutting fluid, and researches show that the cutting-formed waste slurry mainly comprises the following components: 35% -40% of silicon powder, 40% -50% of water-based cooling liquid, 1% -3% of diamond particles and metal impurities, and the existing cooling liquid cannot be recycled after being used, so that on one hand, material waste is caused, the resource utilization of crystalline silicon is not facilitated, on the other hand, the waste cooling liquid used for cutting is difficult to treat, and the burden of environmental treatment is increased, and therefore, the development of the diamond wire cooling liquid convenient to separate and recycle is particularly necessary.
Disclosure of Invention
In order to solve the technical problems, the invention provides a diamond wire cooling liquid and a preparation method and application thereof, and solves the technical problem that the cooling liquid is difficult to recycle after being used in the prior art on the premise of ensuring the cooling and lubricating effects.
The diamond wire cooling liquid comprises, by mass, 50-80 parts of water, 50-80 parts of high-molecular polyether, 3-5 parts of fatty alcohol-polyoxyethylene ether, 3-8 parts of alkynediol polyoxyethylene ether, 3-5 parts of organic acid, 1-3 parts of organic amine and 0.1-0.5 part of a defoaming agent, wherein the mass ratio of the water to the high-molecular polyether is 0.8-1.2, and the diamond wire cooling liquid is a micro-emulsified diamond wire cooling liquid.
Further, the molecular weight of the high molecular polyether is 2000-3000; the organic acid is selected from one or more of acrylic acid, methacrylic acid, ethacrylic acid, alkenyl sulfonic acid, styrene sulfonic acid, maleic anhydride, alkyl propylene oxy sulfonic acid or acrylamide sulfonic acid; the organic amine is selected from one or more of alcohol amine, multi-amino organic amine or amino acid; the defoaming agent is selected from one or more of polymethylsiloxane, polyethyl siloxane, polypropylsiloxane, polybutyl siloxane, polymethylethylsiloxane or polydimethylsiloxane.
Further, the polymer polyether is two different polymer polyethers with molecular weights of 2000-: (1-2) mixing.
The macromolecular polyether obtained by the proportion has moderate kinematic viscosity and good intersolubility with water, and can improve the stability of the microemulsion cooling liquid.
According to a second technical scheme of the invention, the preparation method of the diamond wire cooling liquid comprises the following steps:
dispersing fatty alcohol-polyoxyethylene ether and acetylene glycol polyoxyethylene ether in water under a heating condition to obtain a mixed solution;
and adding the high-molecular polyether into the mixed solution under the stirring condition, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Further, the heating condition is specifically 50-60 ℃; the rotating speed under the stirring condition is 500-1000 r/min.
The limitation of the temperature condition is helpful for improving the compatibility of water and high molecular polyether and promoting the rapid formation of a micro-emulsification state.
According to the third technical scheme, the diamond wire cooling liquid is applied to diamond wire cutting;
furthermore, the cutting tool is used for cutting substances with high hardness, such as photovoltaic silicon wafers, semiconductors, sapphires, glass, magnetic materials and the like.
In the fourth technical scheme of the invention, the method for recovering the diamond wire cooling liquid after use comprises the following steps:
(1) carrying out filter pressing on the cut waste liquid to obtain filter pressing liquid and a filter cake;
(2) filtering the press filtrate by an ultrafiltration membrane to obtain ultrafiltrate;
(3) filtering the ultrafiltrate with ion exchange resin to obtain a fine filtrate;
(4) and (3) supplementing raw materials into the fine filtrate, re-microemulsifying the fine filtrate, recycling the fine filtrate as diamond wire cooling liquid, and purifying the filter cake obtained in the step (1) to recycle the fine filtrate as a cutting raw material.
Further, in the step (1), microporous filter membranes with the pore diameters of 5-10 μm, 2-5 μm and 0.5-2 μm are selected for filtering in sequence in the filter pressing process, and the filtering pressure difference is 1-3 MPa; the ultrafiltration membrane in the step (2) is selected from one of a tubular membrane, a hollow fiber membrane and a ceramic membrane, and the ion exchange resin is selected from one or more of anion resin, cation resin and macroporous resin.
Furthermore, the aperture of the ultrafiltration membrane is 1-100nm, the operating pressure is 0.1-1MPa, and the flow rate of the permeate is 10-30L/h;
in the filter pressing stage, the micropore filtering membranes with different sizes are used for filtering in sequence, so that the pore blockage caused by more macromolecular particle substances in the initial filter pressing stage can be prevented. The ultrafiltration membrane is used for removing the aggregated nano and micron-sized macromolecular impurities; the ion exchange resin is used for removing salt in the cooling liquid, silicate ions and other impurity salt ions generated in the cutting process.
Further, 500m per 400- 3 The diamond wire cooling liquid is replaced after blowing a 5-10 mu m pressure filter membrane by adopting compressed air, and each treatment time is 400-500m 3 The diamond wire cooling liquid is replaced after blowing a 2-5 mu m pressure filter membrane by adopting compressed air, and each treatment time is 400-800m 3 And blowing the 0.5-2 mu m filter pressing film by using compressed air for replacing the diamond wire cooling liquid.
After a certain amount of diamond wire cooling liquid is filtered, the filter pressing membrane is blown by compressed air, so that water molecules and polyether on the filter pressing membrane can be removed, and a high-purity cutting filter cake can be obtained. The filter pressing effect can be improved by replacing the filter pressing membrane regularly. The replaced filter pressing membrane can be reused after filter cakes are removed by compressed air blowback.
Further, the compressed air pressure is 0.5-1 MPa.
Further, the step (4) of supplementing raw materials is specifically supplementing high-molecular polyether, or supplementing fatty alcohol-polyoxyethylene ether and acetylene glycol-polyoxyethylene ether after evaporation and concentration.
The raw material components of the cooling liquid recovered after diamond wire cutting are lost to a certain extent, so that the original proportion of water and polyether is changed, and therefore, when the cooling liquid is used as the cooling liquid again, the raw materials are supplemented until the cooling liquid can be re-microemulsified after being vigorously stirred and then used again.
Compared with the prior art, the invention has the beneficial effects that:
the invention takes water and high molecular polyether as main raw materials, and adds fatty alcohol-polyoxyethylene ether and acetylene glycol-polyoxyethylene ether as surfactants to form a diamond wire coolant microemulsion, wherein the high molecular polyether and microemulsion form the emulsion with good lubricating and cooling effects in the using stage of the coolant, and the water-polyether ratio in the coolant changes and the microemulsion form in the coolant gradually aggregates into macromolecular state from the original micron state, and the flocculation action is played in the aggregation process to promote the aggregation and the gradual aggregation of nanometer and micron cutting micro-powder in the coolant to form macromolecular particles, thereby being beneficial to filtering and removing in the filter-pressing stage, and realizing the invention under the premise of ensuring the cooling and lubricating effects, convenient for recycling.
In the technical scheme of the invention, the fatty alcohol-polyoxyethylene ether is used as a nonionic surfactant, has good water solubility, plays a role in emulsification and is a necessary substance component in the form of the cooling liquid microemulsion; the acetylene glycol polyoxyethylene ether has excellent compatibility in an aqueous system, and can play a role of promoting liquid flow, and the two are mutually matched to promote the generation of a microemulsion; meanwhile, polyoxyethylene ether has extremely low surface tension, so that the formed microemulsion can reduce the dynamic surface tension of the cooling liquid and improve the lubricating effect and the mass transfer efficiency of the cooling liquid. The addition of the organic acid and the organic amine into the cooling liquid can play a role in maintaining the pH value stability of the cooling liquid, and meanwhile, the organic amine and the organic acid can also react to generate an ester compound, so that the cooling liquid plays a role in emulsifying agents to a certain extent and plays a certain role in stabilizing the micro-emulsified state of the cooling liquid, and the addition of a proper amount of the organic amine into the cooling liquid can enable the cooling liquid not to easily breed bacteria and play a role in prolonging the service life of the cooling liquid.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, 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. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
In the following embodiments of the invention, the high molecular polyether is prepared by mixing glycerol ether with molecular weight of 2350 and allyl alcohol ether with molecular weight of 2840 according to a mass ratio of 5:1, the organic acid is acrylic acid, the organic amine is triethanolamine, the defoaming agent is polymethylsiloxane, and the raw materials, fatty alcohol-polyoxyethylene ether and alkynediol-polyoxyethylene ether are all purchased in the market and have no special requirement limitation.
Example 1
(1) Weighing the following raw materials in parts by weight: 50 parts of water, 50 parts of high-molecular polyether, 5 parts of fatty alcohol-polyoxyethylene ether, 8 parts of alkynediol polyoxyethylene ether, 3 parts of organic acid, 3 parts of organic amine and 0.5 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 55 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 1000r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Example 2
(1) Weighing the following raw materials in parts by weight: 80 parts of water, 64 parts of high-molecular polyether, 3 parts of fatty alcohol-polyoxyethylene ether, 3 parts of alkynediol polyoxyethylene ether, 5 parts of organic acid, 1 part of organic amine and 0.1 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 60 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 800r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Example 3
(1) Weighing the following raw materials in parts by weight: 64 parts of water, 80 parts of high-molecular polyether, 4 parts of fatty alcohol-polyoxyethylene ether, 4 parts of alkynediol polyoxyethylene ether, 3 parts of organic acid, 3 parts of organic amine and 0.3 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 50 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 500r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Example 4
(1) Weighing the following raw materials in parts by weight: 60 parts of water, 72 parts of high-molecular polyether, 3 parts of fatty alcohol-polyoxyethylene ether, 8 parts of alkynediol polyoxyethylene ether, 3 parts of organic acid, 1 part of organic amine and 0.3 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 60 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 700r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Example 5
(1) Weighing the following raw materials in parts by weight: 72 parts of water, 60 parts of high-molecular polyether, 5 parts of fatty alcohol-polyoxyethylene ether, 8 parts of alkynediol polyoxyethylene ether, 2.5 parts of organic acid, 2 parts of organic amine and 0.5 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 60 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 1000r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Example 6
The process is the same as in example 1 except that the fatty alcohol-polyoxyethylene ether is omitted.
Example 7
The same as example 1 except that the acetylene glycol polyoxyethylene ether was omitted.
Example 8
The difference from example 1 is that propylene glycol ether having a molecular weight of 2350 is used as the high-molecular polyether.
Example 9
The difference from example 1 is that organic amine and organic acid are omitted.
Example 10
(1) Weighing the following raw materials in parts by weight: 80 parts of water, 50 parts of high-molecular polyether, 5 parts of fatty alcohol-polyoxyethylene ether, 8 parts of alkynediol polyoxyethylene ether, 2.5 parts of organic acid, 2 parts of organic amine and 0.5 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 60 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 1000r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Example 11
(1) Weighing the following raw materials in parts by weight: 50 parts of water, 80 parts of high-molecular polyether, 5 parts of fatty alcohol-polyoxyethylene ether, 8 parts of alkynediol polyoxyethylene ether, 2.5 parts of organic acid, 2 parts of organic amine and 0.5 part of defoaming agent;
(2) dispersing fatty alcohol-polyoxyethylene ether and alkynediol polyoxyethylene ether in water at 60 ℃ to obtain a mixed solution; and adding the high molecular polyether into the mixed solution under the stirring condition of 1000r/min, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
Effect test example 1
The appearance of the diamond wire cooling liquid prepared in examples 1 to 11 was observed, and the results are shown in Table 1;
TABLE 1
| When the preparation is completed | Standing for 24h | Standing for 1 month | |
| Example 1 | Clear microemulsion state | Clear microemulsion state | Clear microemulsion state |
| Example 2 | Clear microemulsion state | Clear microemulsion state | Clear microemulsion state |
| Example 3 | Clear microemulsion state | Clear microemulsion state | Clear microemulsion state |
| Example 4 | Clear microemulsion state | Clear microemulsion state | Clear microemulsion state |
| Example 5 | Clear microemulsion state | Clear microemulsion state | Clear microemulsion state |
| Example 6 | Clear microemulsion state | Slight cloudiness | Turbidity |
| Example 7 | Clear microemulsion state | Slight cloudiness | Turbidity |
| Example 8 | Clear microemulsion state | Clear microemulsion state | Slight cloudiness |
| Example 9 | Clear microemulsion state | Slight cloudiness | Turbidity |
| Example 10 | Slight cloudiness | Turbidity | Turbidity |
| Example 11 | Slight cloudiness | Turbidity | Turbidity |
The data in table 1 show that the diamond wire cooling liquid prepared in embodiments 1-5 of the present invention has good stability both at the beginning of preparation and after standing for 1 month, while in the technical solutions of embodiments 6-9 omitting fatty alcohol-polyoxyethylene ether, acetylenic diol-polyoxyethylene ether and polymer polyether with single molecular weight, although the prepared diamond wire cooling liquid is in a clear microemulsion state at the beginning of preparation, after standing for a period of time, the diamond wire cooling liquid is turbid and the microemulsion state is unstable; in examples 10 and 11 in which the ratio of water to the polymeric polyether is more than 0.8 to 1.2 defined in the present invention, a stable microemulsion cannot be formed, and thus it cannot be used as a coolant.
Effect test example 2
The diamond wire cooling liquid prepared in examples 1 to 11 was used for silicon wafer cutting under the same conditions, and the yield was counted, and the results are shown in table 2;
wherein, the cutting yield is the number of A grade silicon wafers with the appearance grade reaching the specified requirement per cutter/the theoretical number of wafers per cutter is 100%.
TABLE 2
The cooling liquid obtained after the diamond wire cutting in the embodiments 1 to 11 is collected and then recycled, and the specific steps are as follows:
(1) stirring the cut waste liquid at a rotation speed of 500r/min for 30min, and sequentially performing filter pressing on microporous filter membranes with the pore diameters of 10 microns, 5 microns and 2 microns under the condition of pressure difference of 2MPa, wherein each treatment time is 500m 3 The diamond wire cooling liquid is replaced after blowing a 10-micron pressure filter membrane by adopting compressed air, and the treatment time is 500m 3 The diamond wire cooling liquid is replaced after blowing a 5-micron pressure filter membrane by adopting compressed air, and the treatment time is 800m 3 The diamond wire cooling liquid is replaced and collected after blowing a 2-micron filter pressing film by adopting compressed airThe press filtrate and filter cake were collected.
(2) Ultrafiltering the filtrate with hollow fiber ultrafiltration membrane with pore diameter of 50nm under 0.2MPa and 10L/h flow rate of permeate to obtain ultrafiltrate;
(3) adsorbing the ultrafiltrate with 001 × 7 strong acid cation exchange resin (produced by Shanghai Yizhi Co., Ltd.) and 201 × 7 strong base styrene anion exchange resin (produced by Shanghai Yizhi Co., Ltd.) respectively to remove ionic impurities to obtain fine filtrate;
(4) sequentially supplementing 1 part of fatty alcohol-polyoxyethylene ether and 2 parts of alkynediol polyoxyethylene ether to the fine filtrate under the condition of stirring, supplementing 30 parts of high-molecular polyether after uniformly mixing, re-microemulsifying, and recycling as a diamond wire cooling liquid, wherein the filter cake in the step (1) is purified and then recycled as a cutting raw material.
(5) The diamond wire cooling liquid obtained in the step (4) is used for diamond wire cutting again, the cutting yield is counted again, and the result is shown in a table 3;
(6) detecting the silicon content in the filter cake obtained in the step (1) to calculate the recovery rate of the silicon powder, and the result is shown in table 3;
wherein the recovery rate of the silicon powder is equal to the silicon content in the filter cake/the loss of the cut silicon wafer multiplied by 100 percent.
TABLE 3
As can be seen from table 3, the cooling liquid provided by the present invention still has a good cutting yield after being recycled, and can achieve high yield of silicon powder in the cutting waste liquid.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The diamond wire cooling liquid is characterized by comprising, by mass, 50-80 parts of water, 50-80 parts of high-molecular polyether, 30-50 parts of fatty alcohol-polyoxyethylene ether, 3-8 parts of alkynediol polyoxyethylene ether, 3-5 parts of organic acid, 1-3 parts of organic amine and 0.1-0.5 part of a defoaming agent, wherein the mass ratio of the water to the high-molecular polyether is 0.8-1.2, and the diamond wire cooling liquid is a micro-emulsified diamond wire cooling liquid;
the molecular weight of the high molecular polyether is 2000-3000.
2. The diamond wire coolant as claimed in claim 1, wherein the organic acid is selected from one or more of acrylic acid, methacrylic acid, ethacrylic acid, alkenyl sulfonic acid, styrene sulfonic acid, maleic anhydride, alkyl acryloxy sulfonic acid, or acrylamide sulfonic acid; the organic amine is selected from one or more of alcohol amine, multi-amino organic amine or amino acid; the defoaming agent is selected from one or more of polymethylsiloxane, polyethyl siloxane, polypropylsiloxane, polybutyl siloxane or polymethylethyl siloxane.
3. A method for preparing a diamond wire coolant according to any one of claims 1 to 2, comprising the steps of:
dispersing fatty alcohol-polyoxyethylene ether and acetylene glycol polyoxyethylene ether in water under a heating condition to obtain a mixed solution;
and adding the high-molecular polyether into the mixed solution under the stirring condition, and then sequentially adding the organic acid, the organic amine and the defoaming agent to obtain the diamond wire cooling liquid.
4. The method for preparing a diamond wire coolant according to claim 3, wherein the heating conditions are specifically 50 to 60 ℃; the rotating speed under the stirring condition is 500-1000 r/min.
5. Use of a diamond wire coolant according to any one of claims 1-2 in diamond wire cutting.
6. A method for recovering a diamond wire coolant according to any one of claims 1 to 2 after use, comprising the steps of:
(1) carrying out filter pressing on the cut waste liquid to obtain a filter pressing liquid and a filter cake;
(2) filtering the press filtrate by an ultrafiltration membrane to obtain ultrafiltrate;
(3) filtering the ultrafiltrate with ion exchange resin to obtain a fine filtrate;
(4) and (3) supplementing raw materials into the fine filtrate, re-microemulsifying the fine filtrate, recycling the fine filtrate as diamond wire cooling liquid, and purifying the filter cake obtained in the step (1) to recycle the fine filtrate as a cutting raw material.
7. The method for recycling the diamond wire cooling liquid after use according to claim 6, wherein in the step (1), microporous filtering membranes with the pore diameters of 5-10 μm, 2-5 μm and 0.5-2 μm are selected for filtering in sequence in the filter pressing process, and the filtering pressure difference is 1-3 MPa; the ultrafiltration membrane in the step (2) is selected from one of a tubular membrane, a hollow fiber membrane and a ceramic membrane, and the ion exchange resin is selected from one or more of anion resin, cation resin and macroporous resin; and (4) supplementing raw materials, namely supplementing high-molecular polyether, or supplementing fatty alcohol-polyoxyethylene ether and alkynediol-polyoxyethylene ether after evaporation and concentration.
8. The method for recovering the cooling liquid of diamond wire after use as claimed in claim 7, wherein the treatment time is 400-500m 3 The diamond wire cooling liquid is replaced after blowing a 5-10 mu m pressure filter membrane by adopting compressed air, and each treatment time is 400-500m 3 The diamond wire cooling liquid is replaced after blowing a 2-5 mu m pressure filter membrane by adopting compressed air, and each treatment time is 400-800m 3 And blowing the 0.5-2 mu m filter pressing film by using compressed air for replacing the diamond wire cooling liquid.
9. The method for recovering the cooling liquid of the diamond wire after use according to claim 8, wherein the pressure of the compressed air is 0.5 to 1 MPa.
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