Cutting fluid

Abstract

This application provides a cutting fluid comprising an alcohol-based base fluid, a wetting agent, an extreme pressure lubricant, an alkaline pH adjuster, and pure water. The alcohol-based base fluid accounts for 50.0%-55.0% of the total mass of the cutting fluid, the wetting agent accounts for 10.0%-15.0% of the total mass, the extreme pressure lubricant accounts for 1.0%-3.0% of the total mass, and the alkaline pH adjuster accounts for 0.3%-0.5% of the total mass, with the remainder being pure water. The wetting agent is an ethylene oxide-propylene block copolymer obtained by reacting a fatty alcohol initiator, ethylene oxide, and propylene under a catalyst. The block copolymer is end-capped with ethylene oxide ether, and the fatty alcohol initiator is selected from C8-C... 12 The isomeric alkyl alcohol. When the cutting fluid provided in this application is used for diamond wire cutting of silicon rods, the yield of silicon wafers is relatively good.

Description

Technical Field

[0001] This invention relates to the technical field of cutting materials, and more specifically to a cutting fluid. Background Technology

[0002] With the ongoing trend towards thinner wires, tungsten alloy wire, as the primary material for this process, can continue to be used. Currently, 22µm and 20µm tungsten wires are being mass-produced and applied, with future plans including 18µm and 16µm diameters. Finer diameters result in narrower and more numerous kerfs, leading to greater wear on the wire. Cutting friction generates thermal stress, and a narrower kerf makes it harder to remove wafers, thus inflicting thermal stress on the silicon ingot. This exacerbates the problem of microcracks in the silicon ingot during cutting, directly resulting in the loss of high-quality silicon wafers. Currently, cutting fluids using linear fatty alcohol polyethylene oxide ether as a wetting agent have low wafer yields. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention aims to provide a cutting fluid that, when used for diamond wire cutting of silicon rods, results in a better yield of silicon wafers.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A cutting fluid comprising an alcohol-based base fluid, a wetting agent, an extreme pressure lubricant, an alkaline pH adjuster, and pure water. The alcohol-based base fluid is used in an amount of 50.0%-55.0% of the total mass of the cutting fluid; the wetting agent is used in an amount of 10.0%-15.0% of the total mass of the cutting fluid; the extreme pressure lubricant is used in an amount of 1.0%-3.0% of the total mass of the cutting fluid; the alkaline pH adjuster is used in an amount of 0.3%-0.5% of the total mass of the cutting fluid; and the remainder is pure water. The wetting agent is an ethylene oxide-propylene block copolymer obtained by reacting a fatty alcohol initiator, ethylene oxide, and propylene under a catalyst. The block copolymer is end-capped with ethylene oxide ether. The fatty alcohol initiator is selected from C8-C... 12 Isomeric alkyl alcohols.

[0005] In some possible embodiments, the wetting agent has the following general structural formula: RO-[CH2-CH2-O] m -[CH2-CH(CH3)] n -CH2-CH2-OH, where m and n are both integers between 5 and 8, and R is C8-C 12 Isomeric alkyl chains.

[0006] In some possible embodiments, the preparation of the wetting agent includes the following steps: C8-C 12The isomeric alkyl alcohol and alkali metal catalyst are added to the reactor, purged with nitrogen, heated to 100-110°C, and dehydrated under vacuum. The amount of alkali metal catalyst is 5%-15% of the mass of the isomeric alkyl alcohol. After dehydration, according to the degree of polymerization of the ethylene oxide polymeric segments in the block copolymer, a metered amount of the ethylene oxide is introduced into the reactor. The etherification reaction is carried out at a temperature of 100-160°C and the reaction pressure does not exceed 0.4 MPa. After the material is introduced, the reactor is kept at the temperature for 1-2 hours for aging. After thermal aging, the temperature will drop to 30-35℃; After cooling, a metallocene catalyst is added to the reactor. The temperature is then raised to 40-60°C. A metered amount of propylene is introduced according to the degree of polymerization of the propylene polymer segments in the block copolymer to carry out the reaction. The reaction pressure is 0.1-2 MPa, and the reaction temperature is 40-60°C. After the feeding is completed, the reactor is kept at this temperature for aging for 1-3 hours. The amount of the metallocene catalyst is 0.1%-1% of the mass of the propylene. After heat preservation and aging, the temperature is raised to 100-160℃, and metered ethylene oxide is introduced for end-capping. The reaction pressure for end-capping does not exceed 0.4 MPa.

[0007] In some possible implementations, the alcohol base liquid is selected from at least one of glycerol, triethylene glycol, and tetraethylene glycol.

[0008] In some possible implementations, the extreme pressure lubricant is selected as borate sebacate.

[0009] In some possible implementations, the alkaline pH adjuster is selected from polyetheramine.

[0010] In some possible implementations, the value of m is greater than the value of n.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, the wetting agent used in the cutting fluid is a copolymer of propylene and ethylene oxide, and the wetting agent is C8-C. 12 Using isomeric alkyl alcohols as initiators, the polar portion of the wetting agent has a higher ether bond density compared to existing AEO-type wetting agents due to the use of isomeric alkyl alcohols as initiators. In addition, the introduction of isomeric alkyl alcohols and propylene helps to increase the branched content of the hydrophobic portion. The combination of the above structures helps to reduce the dynamic surface tension of the cutting fluid, thereby improving wetting and dispersibility. Furthermore, the quantitative compounding of the wetting agent, alcohol base fluid, and extreme pressure lubricant is more conducive to further improving the wetting and dispersibility of the cutting fluid. As a result, the cutting fluid provided in this application has a better yield when used for diamond wire cutting of silicon rods and silicon wafers.

[0012] The present invention will be further described in detail below with reference to specific embodiments. Detailed Implementation

[0013] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0014] 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 pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0015] The following describes some embodiments of the present invention in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0016] One embodiment of this application provides a cutting fluid comprising an alcohol-based base fluid, a wetting agent, an extreme pressure lubricant, an alkaline pH adjuster, and pure water. The amount of the alcohol-based base fluid is 50.0%-55.0% of the total mass of the cutting fluid; the amount of the wetting agent is 10.0%-15.0% of the total mass of the cutting fluid; the amount of the extreme pressure lubricant is 1.0%-3.0% of the total mass of the cutting fluid; and the amount of the alkaline pH adjuster is 0.3%-0.5% of the total mass of the cutting fluid. The alkaline pH adjuster is used to adjust the pH value of the cutting fluid to 8.5-10, with the remainder being pure water. The wetting agent is an ethylene oxide-propylene block copolymer obtained by reacting a fatty alcohol initiator, ethylene oxide, and propylene under a catalyst. The block copolymer is end-capped with ethylene oxide ether, and the fatty alcohol initiator is selected from C8-C... 12 Isoalkyl alcohols, for example, may include isooctanol (for example, 2-ethylhexanol), isodecanol (for example, 2-propylheptanol), isononol (for example, 7-methyl-1-octanol), isoundecanol (for example, 9-methyl-1-decanol), and isododecanol (for example, 10-methyl-1-undecanol).

[0017] In this application, the wetting agent used in the cutting fluid is a copolymer of propylene and ethylene oxide, and the wetting agent is C8-C. 12Using isomeric alkyl alcohols as initiators, the polar portion of the wetting agent has a higher ether bond density compared to existing AEO-type wetting agents due to the use of isomeric alkyl alcohols as initiators. In addition, the introduction of isomeric alkyl alcohols and propylene helps to increase the branched content of the hydrophobic portion. The combination of the above structures helps to reduce the dynamic surface tension of the cutting fluid, thereby improving wetting and dispersibility. Furthermore, the quantitative compounding of the wetting agent, alcohol base fluid, and extreme pressure lubricant is more conducive to further improving the wetting and dispersibility of the cutting fluid. As a result, the cutting fluid provided in this application has a better yield when used for diamond wire cutting of silicon rods and silicon wafers.

[0018] In some embodiments, the wetting agent has the following general structural formula: RO-[CH2-CH2-O] m -[CH2-CH(CH3)] n -CH2-CH2-OH, where m and n are both integers between 5 and 8, and R is C8-C 12 The isomeric alkyl chain. The length of the wetting agent chain segments can be determined using gel permeation chromatography-multi-angle laser light scattering coupled technology. The degree of polymerization of the subsequent chain segment can be obtained by subtracting the degree of polymerization of the subsequent monomer (propylene) before and after polymerization. The degree of polymerization of the preceding chain segment can be directly measured by measuring the degree of polymerization of the preceding monomer (ethylene oxide) after polymerization. In addition, the end-capping structure of the wetting agent can be determined by nuclear magnetic resonance.

[0019] In some embodiments, the value of m is greater than the value of n.

[0020] In some embodiments, the alcohol base solution is selected from at least one of glycerol, triethylene glycol, and tetraethylene glycol.

[0021] In some embodiments, the extreme pressure lubricant is selected as sebacoborate (an existing organic borate extreme pressure lubricant additive). For example, borate can be synthesized by boric acid and triethanolamine, and sebacoborate can be obtained by compounding the carboxylate synthesized by borate with sebacic acid and triethanolamine in a 2:1 ratio.

[0022] In some embodiments, the alkaline pH adjuster is selected from polyetheramine.

[0023] In some embodiments, the preparation of the wetting agent includes the following steps: C8-C 12An isomeric alkyl alcohol and an alkali metal catalyst are added to a reaction vessel. After nitrogen purging, the temperature is raised to 100-110°C, and dehydration is performed under vacuum. The amount of the alkali metal catalyst is 5%-15% of the mass of the isomeric alkyl alcohol. For example, nitrogen purging can be performed two or three times. For example, the alkali metal catalyst can be at least one of sodium hydroxide, potassium hydroxide, sodium methoxide, or potassium methoxide. After dehydration, a measured amount of ethylene oxide is introduced into the reaction vessel according to the degree of polymerization of the ethylene oxide polymeric segment in the block copolymer. The etherification reaction is carried out at a temperature of 100-160°C, and the reaction pressure does not exceed 0.4 MPa. After the feeding is completed, the mixture is kept at this temperature for 1-2 hours for aging. For example, when the degree of polymerization of the ethylene oxide polymeric segment in the block copolymer is m, the isomeric alkyl alcohol: ethylene oxide ratio is 1:m by molarity. After aging, the temperature is lowered to 30-35°C. After cooling, a metallocene catalyst is added to the reactor. The temperature is then raised to 40-60°C. A measured amount of propylene is introduced according to the degree of polymerization of the propylene polymer segments in the block copolymer. The reaction pressure is 0.1-2 MPa, and the reaction temperature is 40-60°C. After the reaction is complete, the reactor is kept at this temperature for 1-3 hours for aging. The amount of the metallocene catalyst is 0.1%-1% of the mass of the propylene. For example, when the degree of polymerization of the propylene polymer segments in the block copolymer is n, the ratio of isoalkyl alcohol to ethylene oxide is 1:n by molar weight. After aging, the temperature is raised to 100-160°C, and a measured amount of ethylene oxide is introduced for end-capping. The end-capping reaction pressure does not exceed 0.4 MPa. For example, the amounts of ethylene oxide and isoalkyl alcohol used for end-capping are the same by molar weight.

[0024] The following is a detailed description of the embodiments.

[0025] Example 1 A cutting fluid comprising an alcohol base (a mixture of triethylene glycol and tetraethylene glycol in a mass ratio of 1:1), a wetting agent, an extreme pressure lubricant (borate sebacic acid ester), an alkaline pH adjuster (polyetheramine B100), and pure water. The amount of the alcohol base is 50.0% of the total mass of the cutting fluid, the amount of the wetting agent is 10.0% of the total mass of the cutting fluid, the amount of the extreme pressure lubricant is 1.0% of the total mass of the cutting fluid, the amount of the alkaline pH adjuster is 0.3% of the total mass of the cutting fluid, and the remainder is pure water. The wetting agent is an ethylene oxide-propylene block copolymer obtained by reacting a fatty alcohol initiator, ethylene oxide, and propylene under a catalyst. The block polyether is end-capped with ethylene oxide ether. The fatty alcohol initiator is selected from C8-C12 isomeric alkyl fatty alcohols. In this embodiment, the initiator is isooctanol (2-ethylhexanol).

[0026] The general structural formula of the wetting agent is as follows: RO-[CH2-CH2-O]m -[CH2-CH(CH3)] n -CH2-CH2-OH, m takes the value of 6, n takes the value of 5, and R is C8-C 12 Isomeric alkyl chains.

[0027] The preparation of the wetting agent includes the following steps: C8-C 12 The isomeric alkyl alcohol and alkali metal catalyst (sodium hydroxide) were added to the reactor. After nitrogen purging (three times), the temperature was raised to 100°C, and dehydration was carried out under vacuum for 2 hours. The amount of alkali metal catalyst was 15% of the mass of the isomeric alkyl alcohol. After dehydration, according to the degree of polymerization (6) of the ethylene oxide polymer chain in the block copolymer, a metered amount of ethylene oxide (the amount of ethylene oxide was 6 times the amount of the isomeric alkyl alcohol) was introduced into the reactor. The etherification reaction was carried out at a temperature of 160°C, and the reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.3 MPa). After the feeding was completed, the reactor was kept at a constant temperature for 1.5 hours for aging. After aging, the temperature was lowered to 35°C. After cooling, a metallocene catalyst (SMC-PL01 catalyst) was added to the reactor. After heating to 55°C, a metered amount of propylene was introduced to react according to the degree of polymerization (5) of the propylene polymer chain in the block copolymer. The reaction pressure was 1 MPa, and the reaction temperature was 50°C. After the material was introduced, the reactor was kept at the temperature for 3 hours for aging. The amount of the metallocene catalyst was 0.1% of the mass of the propylene. After aging, the temperature was raised to 160°C, and a metered amount of ethylene oxide (the amount of which was the same as the amount of the isomeric alkyl alcohol) was introduced for end-capping. The end-capping reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.2 MPa).

[0028] Example 2 The difference from Example 1 is that the amount of the alcohol-based base fluid is 52% of the total mass of the cutting fluid, the amount of the wetting agent is 13% of the total mass of the cutting fluid, the amount of the extreme pressure lubricant is 2.0% of the total mass of the cutting fluid, the amount of the alkaline pH adjuster is 0.4% of the total mass of the cutting fluid, and the alcohol-based base fluid is triethylene glycol. The general structural formula of the wetting agent is as follows: RO-[CH2-CH2-O] m -[CH2-CH(CH3)] n -CH2-CH2-OH, m takes the value 6, n takes the value 6, and R is C8-C 12 Isomeric alkyl chains.

[0029] In addition, the preparation of the wetting agent includes the following steps: C8-C 12The isomeric alkyl alcohol and alkali metal catalyst (potassium hydroxide) were added to the reactor. After nitrogen purging (twice), the temperature was raised to 105°C, and dehydration was carried out under vacuum for 1.5 hours. The amount of alkali metal catalyst was 11% of the mass of the isomeric alkyl alcohol. After dehydration, according to the degree of polymerization (6) of the ethylene oxide polymer chain in the block copolymer, a metered amount of ethylene oxide (the amount of ethylene oxide was 6 times the amount of the isomeric alkyl alcohol) was introduced into the reactor. The etherification reaction was carried out at a temperature of 130°C, and the reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.2 MPa). After the material was introduced, the reactor was kept at a constant temperature for 2 hours for aging. After aging, the temperature was lowered to 30°C. After cooling, a metallocene catalyst (SMC-PL01 catalyst) was added to the reactor. After heating to 40°C, a metered amount of propylene was introduced to react according to the degree of polymerization (6) of the propylene polymer chain in the block copolymer. The reaction pressure was 2 MPa, and the reaction temperature was 40°C. After the material was introduced, the reactor was kept at the temperature for 2 hours for aging. The amount of the metallocene catalyst was 1% of the mass of the propylene. After aging, the reactor was heated to 135°C, and a metered amount of ethylene oxide (the amount of which was the same as the amount of the isomeric alkyl alcohol) was introduced for end-capping. The end-capping reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.3 MPa).

[0030] Example 3 The difference from Example 1 is that the amount of the alcohol-based base fluid is 55% of the total mass of the cutting fluid, the amount of the wetting agent is 15% of the total mass of the cutting fluid, the amount of the extreme pressure lubricant is 3.0% of the total mass of the cutting fluid, the amount of the alkaline pH adjuster is 0.5% of the total mass of the cutting fluid, and the alcohol-based base fluid is tetraethylene glycol. The general structural formula of the wetting agent is as follows: RO-[CH2-CH2-O] m -[CH2-CH(CH3)] n -CH2-CH2-OH, m takes the value 5, n takes the value 8, and R is C8-C 12 The isomeric alkyl chain. In this embodiment, isododecanool (10-methyl-1-undecanool) is selected as the initiator.

[0031] In addition, the preparation of the wetting agent includes the following steps: C8-C 12The isomeric alkyl alcohol and alkali metal catalyst (sodium methoxide) were added to the reactor. After nitrogen purging (once), the temperature was raised to 110°C, and dehydration was carried out under vacuum for 1 hour. The amount of alkali metal catalyst was 7% of the mass of the isomeric alkyl alcohol. After dehydration, according to the degree of polymerization (5) of the ethylene oxide polymer chain in the block copolymer, a metered amount of ethylene oxide (the amount of ethylene oxide was 5 times the amount of the isomeric alkyl alcohol) was introduced into the reactor. The etherification reaction was carried out at a temperature of 100°C, and the reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.4 MPa). After the material was introduced, the reactor was kept at a constant temperature for 1 hour. After the aging process, the temperature was lowered to 32°C. After cooling, a metallocene catalyst (SMC-PL01 catalyst) was added to the reactor. After heating to 60°C, a measured amount of propylene was introduced according to the degree of polymerization (8) of the propylene polymer chain in the block copolymer for reaction. The reaction pressure was 0.1 MPa, the reaction temperature was 60°C, and after the feeding was completed, the reactor was kept at the temperature for aging for 1 hour. The amount of the metallocene catalyst was 0.4% of the mass of the propylene. After the aging, the temperature was raised to 120°C, and a measured amount of ethylene oxide (the amount of which was the same as the amount of the isomeric alkyl alcohol) was introduced for end-capping. The end-capping reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.1 MPa).

[0032] Example 4 The difference from Example 1 is that the amount of the alcohol-based base fluid is 54% of the total mass of the cutting fluid, the amount of the wetting agent is 11% of the total mass of the cutting fluid, the amount of the extreme pressure lubricant is 2.5% of the total mass of the cutting fluid, the amount of the alkaline pH adjuster is 0.4% of the total mass of the cutting fluid, and the alcohol-based base fluid is glycerol. The general structural formula of the wetting agent is as follows: RO-[CH2-CH2-O] m -[CH2-CH(CH3)] n -CH2-CH2-OH, m takes the value 8, n takes the value 7, and R is C8-C 12 The isomeric alkyl chain. In this embodiment, isononol (7-methyl-1-octanol) was selected as the initiator.

[0033] In addition, the preparation of the wetting agent includes the following steps: C8-C 12The isomeric alkyl alcohol and alkali metal catalyst (potassium methoxide) were added to the reactor. After nitrogen purging (twice), the temperature was raised to 102°C, and dehydration was carried out under vacuum for 2 hours. The amount of alkali metal catalyst was 5% of the mass of the isomeric alkyl alcohol. After dehydration, according to the degree of polymerization (8) of the ethylene oxide polymer chain in the block copolymer, a metered amount of ethylene oxide (the amount of ethylene oxide was 8 times the amount of the isomeric alkyl alcohol) was introduced into the reactor. The etherification reaction was carried out at a temperature of 125°C, and the reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.2 MPa). After the material was introduced, the reactor was kept at a constant temperature for 1.5 hours for aging. After aging, the temperature was lowered to 33°C. After cooling, a metallocene catalyst (SMC-PL01 catalyst) was added to the reactor. After heating to 55°C, a measured amount of propylene (the amount of which is 7 times the amount of the initiator) was introduced according to the degree of polymerization (7) of the propylene polymer chain in the block copolymer. The reaction pressure was 0.8 MPa, the reaction temperature was 47°C, and after the material was introduced, the reactor was kept at this temperature for 1.8 hours. The amount of the metallocene catalyst was 0.7% of the mass of the propylene. After the reactor was kept at this temperature for aging, the temperature was raised to 100°C, and a measured amount of ethylene oxide (the amount of which is the same as the amount of the isomeric alkyl alcohol) was introduced for end-capping. The end-capping reaction pressure did not exceed 0.4 MPa (the reaction pressure in this embodiment was 0.3 MPa).

[0034] Example 5 The difference from Example 1 is that isodecanol (2-propylheptanol) was used as the initiator.

[0035] Example 6 The difference from Example 3 is that the initiator used isoundecaneol (9-methyl-1-decanol).

[0036] The amount of alkaline pH adjuster used in the above embodiments is to adjust the pH value of the cutting fluid to 8.5-10.

[0037] When the cutting fluid in the above embodiment is used to cut silicon rods, the diameter of the tungsten wire diamond wire is selected as 20µm. Specific silicon wafer wire cutting parameters are provided in CN118682933A, which describes a silicon wafer wire cutting method. The diameter of the silicon rod is selected as 180mm, and the wafer thickness is 100µm.

[0038]

[0039] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A cutting fluid, characterized in that, The cutting fluid comprises an alcohol-based base fluid, a wetting agent, an extreme pressure lubricant, an alkaline pH adjuster, and pure water. The amount of the alcohol-based base fluid is 50.0%-55.0% of the total mass of the cutting fluid, the amount of the wetting agent is 10.0%-15.0% of the total mass of the cutting fluid, the amount of the extreme pressure lubricant is 1.0%-3.0% of the total mass of the cutting fluid, and the amount of the alkaline pH adjuster is 0.3%-0.5% of the total mass of the cutting fluid, with the remainder being pure water. The wetting agent is an ethylene oxide-propylene block copolymer obtained by reacting a fatty alcohol initiator, ethylene oxide, and propylene under a catalyst. The block polyether is end-capped with ethylene oxide ether, and the fatty alcohol initiator is selected from C8-C. 12 Isomeric alkyl alcohols.

2. The cutting fluid as described in claim 1, characterized in that, The general structural formula of the wetting agent is as follows: RO-[CH2-CH2-O] m -[CH2-CH(CH3)] n -CH2-CH2-OH, where m and n are both integers between 5 and 8, and R is C8-C 12 Isomeric alkyl chains.

3. The cutting fluid as described in claim 1, characterized in that, The preparation of the wetting agent includes the following steps: C8-C 12 The isomeric alkyl alcohol and alkali metal catalyst are added to the reactor, purged with nitrogen, heated to 100-110°C, and dehydrated under vacuum. The amount of alkali metal catalyst is 5%-15% of the mass of the isomeric alkyl alcohol. After dehydration, according to the degree of polymerization of the ethylene oxide polymeric segments in the block copolymer, a metered amount of the ethylene oxide is introduced into the reactor. The etherification reaction is carried out at a temperature of 100-160°C and the reaction pressure does not exceed 0.4 MPa. After the material is introduced, the reactor is kept at the temperature for 1-2 hours for aging. After thermal aging, the temperature will drop to 30-35℃; After cooling, a metallocene catalyst is added to the reactor. The temperature is then raised to 40-60°C. A metered amount of propylene is introduced according to the degree of polymerization of the propylene polymer segments in the block copolymer to carry out the reaction. The reaction pressure is 0.1-2 MPa, and the reaction temperature is 40-60°C. After the feeding is completed, the reactor is kept at this temperature for aging for 1-3 hours. The amount of the metallocene catalyst is 0.1%-1% of the mass of the propylene. After heat preservation and aging, the temperature is raised to 100-160℃, and metered ethylene oxide is introduced for end-capping. The reaction pressure for end-capping does not exceed 0.4 MPa.

4. The cutting fluid as described in claim 1, characterized in that, The alcohol base solution is selected from at least one of glycerol, triethylene glycol, and tetraethylene glycol.

5. The cutting fluid as described in claim 1, characterized in that, The extreme pressure lubricant is borate sebacate.

6. The cutting fluid as described in claim 1, characterized in that, The alkaline pH adjuster is polyetheramine.

7. The cutting fluid as described in claim 2, characterized in that, The value of m is greater than the value of n.

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