CN115521449A - Perfluoropolyether working fluid and application thereof, high-low temperature circulating impact system and testing method - Google Patents
Perfluoropolyether working fluid and application thereof, high-low temperature circulating impact system and testing method Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 85
- 238000012360 testing method Methods 0.000 title abstract description 10
- 239000003921 oil Substances 0.000 claims abstract description 29
- 229920000642 polymer Polymers 0.000 claims abstract description 29
- 238000009863 impact test Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 4
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- 238000005979 thermal decomposition reaction Methods 0.000 claims description 3
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/002—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds
- C08G65/005—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds containing halogens
- C08G65/007—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds containing halogens containing fluorine
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a perfluoropolyether working fluid with a structural formula of R f1 ‑O‑(CF(CF 3 )CF 2 O)m‑(CF 2 O) q ‑R f2 Perfluoropolyether oil polymers of (A), R f1 、R f2 is-CF 3 、‑CF 2 CF 3 (ii) a m and q represent the number of repeating units, m is 3 to 8, q/m =0 to 0.3. The composite material has excellent flow property, low volatility, excellent stability, high electric insulation property and good compatibility with contact samples or electronic components in a wide temperature range. Therefore, the impact testing fluid can be used as a medium and combined with a temperature control unit, a fluid circulating pump and the like to be applied to a high-low temperature circulating impact system, and particularly, a high-low temperature circulating impact system based on a perfluoropolyether working fluid and a high-low temperature circulating impact testing method based on the perfluoropolyether working fluid can be developed and researched for being used for testing high-low temperature circulating impact of the perfluoropolyether working fluidThe working conditions of the sample piece or the electronic component under different application scenes and environmental conditions are simulated without causing damage and destruction.
Description
Technical Field
The invention relates to a perfluoropolyether working fluid and application thereof, a high-low temperature cyclic impact system and a testing method, and particularly provides a novel perfluoropolyether working fluid which can simulate repeated high-low temperature impact conditions in a high-low temperature cyclic impact system and a high-low temperature cyclic impact test without causing damage and damage to a test sample piece, belonging to the field of high-performance fluoropolymer materials.
Background
With the rapid development of scientific technology, materials, electronic components and the like need to meet different application scenes and environmental conditions, and similar conditions need to be equipped or set to simulate the environmental conditions and working conditions in order to evaluate the application performance, adaptability and servo performance of the materials, the electronic components and the like under different conditions. The high-temperature and low-temperature conversion condition is a relatively common conversion condition, and in order to simulate the performance change trend of materials, electronic components and the like along with the temperature change under the conversion condition from low temperature to high temperature, the design and development of an impact system with the function of simulating high-temperature and low-temperature circulation are necessary.
The impact system of high and low temperature circulation needs to provide repeated temperature impact simulation conditions and scenes from high temperature to low temperature to high temperature by a single working medium under the condition of no working medium conversion, and the fluid medium serving as the single working medium needs to meet or ensure that the fluid medium does not cause sudden change or even condensation of viscosity indexes along with temperature change and large volatilization loss under the high and low temperature switching, and does not damage and destroy sample pieces and (or) electronic components for impact test.
The invention patent with publication number CN114144922A discloses a liquid heat transfer mixture, in which the volume ratio of liquid perfluoropolyether to liquid alkoxy-perfluoroalkane is 20: 80 to 80: 20, the boiling point of perfluoropolyether is at least higher than 55 ℃ and higher than the boiling point of alkoxy-perfluoroalkane, and thus it is known that the patent discloses that low-boiling alkoxy-perfluoroalkane is added to perfluoropolyether according to a certain proportion, which is highly volatile and is more suitable for use in cooling working media, such as for use in battery heat management as described in the patent, and is not suitable for thermal shock under high and low temperature cycle conditions (especially under high temperature conditions). In addition, patent publication No. CN112135811A discloses a perfluoroaminoolefin compound as a working fluid for heat transfer in which electronic devices such as battery packs, circuit boards, semiconductor devices, etc. can be immersed. However, the perfluoro-aminoalkene belongs to micromolecular compounds, has a low boiling point (can be used for foaming as described in the patent; the two-phase immersion fluid working medium realizes heat transfer-heat management through evaporation phase change), cannot ensure non-volatilization or low volatilization under a high-temperature condition, and is not suitable for high-temperature and low-temperature cycle impact working media.
Disclosure of Invention
The invention aims to provide a perfluoropolyether working fluid which has excellent flowing property, low volatility, excellent stability, high electrical insulation property and better compatibility with a contact sample piece or an electronic component within a wide temperature range due to the specific structural composition. Therefore, the impact simulation test device can be used as a medium and applied to a high-low temperature circulating impact system by combining a temperature control unit, a fluid circulating pump and the like, and particularly, a high-low temperature circulating impact system based on the perfluoropolyether working fluid and a high-low temperature circulating impact test method based on the perfluoropolyether working fluid can be developed and researched so as to be used for simulating working conditions of a sample piece or an electronic component under different application scenes and environmental conditions without causing damage and damage.
The invention is realized by the following technical scheme:
the first technical scheme is as follows:
a perfluoropolyether working fluid uses a perfluoropolyether oil polymer represented by the following formula (1):
R f1 -O-(CF(CF 3 )CF 2 O)m-(CF 2 O) q -R f2 （1）
wherein R is f1 、R f2 is-CF 3 、-CF 2 CF 3 (ii) a m and q represent the number of repeating units, m is 3 to 8, q/m =0 to 0.3,
the perfluoropolyether oil polymer meets the following performance indexes: boiling point: 130 to 230 ℃; thermal decomposition temperature: more than or equal to 300 ℃; saturated vapor pressure at 40 ℃: < 1000Pa; kinematic viscosity at 40 ℃: 1-3 cst; pour point: -50 deg.C; acid value: less than or equal to 0.03mg/g; surface tension: less than 20mN; no flash point.
The molecular weight of the perfluoropolyether oil polymer is 800-1200.
The second technical scheme is as follows:
use of a perfluoropolyether working fluid in a high and low temperature cyclic impingement system comprising a vessel, a temperature control unit, and a fluid circulation pump, wherein,
the container is a sample pool for containing the perfluoropolyether working fluid and is used for immersing the high-low temperature impact test sample piece in the perfluoropolyether working fluid;
the temperature control unit is used for controlling the temperature of the perfluoropolyether working fluid in the container;
the fluid circulating pump is used for circulating the perfluoropolyether working fluid in the container so as to realize accurate control of the temperature of the perfluoropolyether working fluid.
The third technical scheme is as follows:
a perfluoropolyether working fluid-based high and low temperature cyclic impingement system comprising:
a container for containing the perfluoropolyether working fluid;
the temperature control unit is used for controlling the temperature of the perfluoropolyether working fluid in the container;
and the fluid circulating pump is used for circulating the perfluoropolyether working fluid in the container.
Furthermore, the container is made of stainless steel, aluminum alloy or plastic steel composite materials.
The technical scheme is as follows:
a high-low temperature impact test method based on perfluoropolyether working fluid is characterized in that a high-low temperature impact test sample piece is immersed in a container containing the perfluoropolyether working fluid, the perfluoropolyether working fluid in the container is heated or cooled by a temperature control unit, and a fluid circulating pump of the container is started to circulate the perfluoropolyether working fluid.
In the invention, the temperature control unit is a temperature controller with quick heating and cooling functions, and the temperature control precision is less than or equal to +/-0.5 ℃.
Further, the temperature range of the high-temperature and low-temperature circulation of the perfluoropolyether working fluid is-50 ℃ to 200 ℃.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the perfluoropolyether oil polymer has specific structural composition and appropriate molecular weight and distribution condition, so that the perfluoropolyether oil polymer meets specific index performance of working fluid required by a high-low temperature cycle impact system, namely: the composite material can maintain excellent flowing property and low volatility in a wide temperature range of-50 ℃ to 200 ℃, and simultaneously has excellent stability, high electrical insulation property and compatibility with contact samples or electronic components.
Furthermore, the perfluoropolyether oil polymer can be combined with structures such as a temperature control unit, a fluid circulating pump and a container to form a high-low temperature circulating system based on the perfluoropolyether oil polymer, and can be used for simulating working conditions of samples or electronic components under different application scenes and environmental conditions without causing damage and destruction.
Drawings
FIG. 1 is a schematic structural diagram of a high and low temperature cyclic impact system according to the present invention.
Detailed Description
The objects, technical solutions and advantageous effects of the present invention will be described in further detail below.
It is to be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention claimed, and 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 invention provides a perfluoropolyether working fluid, which specifically adopts a perfluoropolyether oil polymer shown in the following formula (1):
R f1 -O-(CF(CF 3 )CF 2 O)m-(CF 2 O) q -R f2 （1）
wherein R is f1 、R f2 is-CF 3 、-CF 2 CF 3 (ii) a m and q represent the number of repeating units, m is 3 to 8, q/m =0 to 0.3, and the molecular weight is 800 to 1200.
For example: CF (compact flash) 3 -O-(CF(CF 3 )CF 2 O) 5 -(CF 2 O) 1 -CF 2 CF 3 、CF 3 -O-(CF(CF 3 )CF 2 O) 6 -CF 3 、CF 2 CF 3 -O-(CF 2 CF 2 O) 5 -(CF 2 O) 1 -CF 3 And so on.
Due to the specific structural composition and the appropriate molecular weight and distribution, the perfluoropolyether oil polymer meets the following performance indexes: the boiling point is 130-230 ℃, so the material has low volatility, is still in a liquid state under the high-temperature application condition, and has the characteristics of low volatility and less material loss; the thermal decomposition temperature is more than or equal to 300 ℃ and the saturated vapor pressure is less than 1000Pa (40 ℃), so that the material has high stability, high inertia and non-combustible performance; the kinematic viscosity is 1-3 cst (40 ℃), so that the proper flowing property can be ensured when the temperature changes are switched under the conditions of high temperature and low temperature; the pour point is lower than-50 ℃ and even lower than-70 ℃, so that the alloy has better fluidity at low temperature and meets the requirement on fluidity at low temperature; the acid value is less than or equal to 0.03mg/g, so that the corrosion and the damage to materials and components in contact with the acid value can be avoided; the surface tension is less than 20mN, so that the residual on the surfaces of contacted materials and components can be avoided; no flash point, indicating no fire and fire risk.
Further, the invention also provides application of the perfluoropolyether oil polymer in a high-low temperature cycle impact system, and particularly provides a high-low temperature cycle impact system based on a perfluoropolyether working fluid and a high-low temperature cycle impact testing method based on the perfluoropolyether working fluid.
For example, a high-low temperature cycle impact system, which specifically comprises a container, a temperature control unit and a fluid circulation pump, wherein the container is used for containing the perfluoropolyether oil polymer as a working medium; the temperature control unit can adopt an automatic heating and refrigerating integrated device and is used for providing energy and controlling the temperature of heating and cooling the perfluoropolyether oil polymer in the container; the fluid circulating pump is communicated with the container and used for circulating the perfluoropolyether oil polymer in the container so as to realize high-temperature and low-temperature rise and fall and maintain the temperature control accuracy of the working fluid. When the device is used, in order to ensure that a sample piece to be detected and (or) an electronic component are fully immersed into the perfluoropolyether oil polymer, a liquid level detection device can be arranged on the container so as to be convenient to operate or control, and a solution can adopt a sealing cover or other structures so as to avoid the influence of impurities such as dust on detection.
For example, the high and low temperature cycle impact test method comprises the following operation methods: adding a proper amount of perfluoropolyether oil polymers into a container, fully immersing a high-low temperature impact test sample piece and/or an electronic component into the perfluoropolyether oil polymers, heating or cooling the perfluoropolyether oil polymers in the container by using a temperature control unit, and starting a fluid circulating pump of the container to circulate the perfluoropolyether working fluid so as to realize accurate control of the temperature of the perfluoropolyether oil polymers. In order to further realize the accurate control of the temperature, a temperature controller with the functions of rapid heating and cooling can be adopted for the temperature control unit, and the temperature control accuracy is +/-0.5 ℃, and more preferably +/-0.1 ℃. In the actual operation process, the temperature of the perfluoropolyether oil polymer is controlled by a temperature controller to continuously carry out high-low temperature circulation so as to realize high-low temperature circulation impact on a sample to be tested and/or an electronic component, and the temperature range for realizing the high-low temperature circulation is-50-200 ℃ based on the perfluoropolyether oil polymer.
Example 1:
hexafluoropropylene monomer is adopted as raw material to prepare perfluoropolyether acyl fluoride or carboxylic acid with molecular weight of 500-2000 through photooxidation polymerization reaction, and then fluorine-nitrogen mixed gas (F) is adopted 2 ：20%、N 2 : 80%) was subjected to terminal group stabilization treatment, and was dropped after stabilization treatmentAnd (3) determining the acid value to be below 0.03mg/g, and then rectifying and collecting fraction materials with the molecular weight of 800-1200 by stages to obtain the perfluoropolyether oil polymer.
Example 2:
using hexafluoropropylene monomer as raw material, making it undergo the process of photooxidation polymerization reaction to obtain perfluoropolyether acyl fluoride or carboxylic acid whose molecular weight is 500-2000, then using fluorine-nitrogen mixed gas (F) 2 ：20%、N 2 : 80%) of the perfluoro polyether oil polymer, carrying out end group stabilization treatment, carrying out stabilization treatment, then titrating the acid value to be below 0.03mg/g, and carrying out rectification and fractional collection on fraction materials with the molecular weight of 800-1200 to obtain the perfluoro polyether oil polymer.
The properties of the perfluoropolyether oil-based polymers obtained in examples 1 and 2 were measured and shown in table 1 below.
TABLE 1 test Performance Table for perfluoropolyether oil polymers
Example 3:
the high and low temperature cyclic impingement system shown in fig. 1 is used.
Adding a perfluoropolyether working fluid into a circulation tank (container), respectively installing a fluid circulating pump and a temperature controller on the circulation tank, wherein the fluid circulating pump can realize circulation of the perfluoropolyether working fluid in the circulation tank so as to maintain the accuracy of temperature control of the working fluid, and the temperature controller can control the temperature of the perfluoropolyether working fluid, for example: control of heating temperature, control of cooling temperature, control of heating or cooling time, and the like.
Example 4:
a piece of PCB circuit board with a size of 3 × 10cm and treated with a three-proofing coating was placed in the circulation tank of the high and low temperature cyclic impact system (example 3) shown in fig. 1.
The basic properties of the perfluoropolyether working fluid adopted in the circulation tank are as follows: acid value of 0.013mg/g, molecular weight of 1050, boiling point of 215 ℃, saturated vapor pressure of less than 500Pa (40 ℃), kinematic viscosity of 1.91cst (40 ℃), pour point of-55 ℃, 18.9mN of surface tension, 2.05 of 1 KHz dielectric constant and 3.1 multiplied by 10 of volume resistance 13 Ω.cm。
The high-low temperature circulating impact system is set to complete one round of temperature circulation every 48 hours through a program, and the specific temperature control program is as follows:
the PCB circuit board carries out the high-low temperature cyclic impact in the circulation groove, and the high-low temperature impact is simulated to influence the three-proofing coating through 5000h cyclic impact treatment, and the conditions are as follows:
the mass change of the perfluoropolyether working fluid before and after the simulation experiment is accurately weighed for 5000h, the loss rate is less than 1.5wt%, which shows that no volatilization loss is basically ensured in the long-term operation process due to the ultralow volatility.
Sampling, observing and testing the perfluoropolyether fluid working medium: colorless and transparent in appearance, acid value of 0.014mg/g, molecular weight of 1100, boiling point: 216 ℃, saturated vapor pressure less than 500Pa (40 ℃), kinematic viscosity 1.93cst (40 ℃), pour point-55 ℃, dielectric constant of 1 KHz 2.05, volume resistance: 3.1X 10 13 Omega cm. The results show that the working fluid maintains excellent stability and inertness through the perinatal run.
Example 5:
according to the high-low temperature circulating impact system shown in fig. 1, two sets of circulating tanks are arranged, a fluid circulating pump and a temperature controller are respectively arranged on the two circulating tanks, the temperatures of the two circulating tanks are respectively controlled to be 100 ℃ and minus 50 ℃, a PCB (printed circuit board) is controlled by an automatic mechanical arm according to a program, and the PCB is switched and transferred between the two circulating tanks at regular time.
The basic properties of the perfluoropolyether working fluid adopted in the two-cycle tank are as follows: acid value of 0.010mg/g, molecular weight of 850, boiling point of 192 deg.C, saturated vapor pressure of less than 500Pa (40 deg.C), kinematic viscosity of 1.83cst (40 deg.C), pour point of-60 deg.C, surface tension of 18.5mN, dielectric constant of 1 KHz of 2.05, volume resistance of 2.8 × 10 13 Ω.cm。
The temperature cycle program of the high-low temperature cycle impact system is set by the program as follows:
the PCB circuit board carries out above-mentioned high low temperature cycle impact in high low temperature circulation groove, and through 1000h cycle impact processing simulation high, low temperature impact to three proofings coating influence, the condition is as follows:
the mass change of the perfluoropolyether working fluid before and after a 1000-hour simulation experiment is accurately weighed, the loss rates of the working medium of the two circulation tanks are respectively 1.3wt% and 1.2wt%, and the result shows that the loss of volatilization is basically avoided in the long-term operation process due to the ultralow volatility.
Sampling, observing and testing a perfluoropolyether fluid working medium: colorless and transparent in appearance, the acid value is 0.011mg/g, the molecular weight is 870, the boiling point is as follows: 192.5 ℃, saturated vapor pressure less than 500Pa (40 ℃), kinematic viscosity of 1.84cst (40 ℃), pour point-60 ℃, dielectric constant of 1 KHz of 2.05, volume resistance: 2.85X 10 13 Omega cm. The results show that the working fluid maintains excellent stability and inertness through the in-term operation.
Comparative example 1:
the fluid working medium adopts 50cst dimethyl silicone oil to replace the perfluoropolyether fluid working medium, simulation tests are carried out according to the circulation conditions described in the embodiment 3, the condition that the circulating pump is overloaded at the low temperature of minus 40 ℃, and after about 1000 hours of circulation, obvious liquid level reduction occurs, and liquid supplementing treatment is required, which indicates that the volatilization loss of the working medium is caused by volatilization.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. A perfluoropolyether working fluid characterized by: a perfluoropolyether oil-based polymer represented by the following formula (1) is used:
R f1 -O-(CF(CF 3 )CF 2 O)m-(CF 2 O) q -R f2 （1）
wherein R is f1 、R f2 is-CF 3 、-CF 2 CF 3 (ii) a m and q represent the number of repeating units, m is 3 to 8, q/m =0 to 0.3,
the perfluoropolyether oil polymer meets the following performance indexes: boiling point: 130 to 230 ℃;5wt% thermal decomposition temperature: more than or equal to 300 ℃; saturated vapor pressure at 40 ℃: < 1000Pa; kinematic viscosity at 40 ℃: 1-3 cst; pour point: -50 deg.C; acid value: less than or equal to 0.03mg/g; surface tension: less than 20mN; no flash point.
2. The perfluoropolyether working fluid of claim 1, characterized in that: the molecular weight of the perfluoropolyether oil polymer is 800-1200.
3. The application of the perfluoropolyether working fluid in a high-low temperature cycle impact system is characterized in that: the high and low temperature cyclic impingement system comprises a vessel, a temperature control unit, and a fluid circulation pump, wherein,
the container is a sample pool containing the perfluoropolyether working fluid in claim 1, and is used for immersing the high-low temperature impact test sample piece in the perfluoropolyether working fluid;
the temperature control unit is used for controlling the temperature of the perfluoropolyether working fluid in the container;
the fluid circulating pump is used for circulating the perfluoropolyether working fluid in the container to realize the accurate control of the temperature of the perfluoropolyether working fluid.
4. A high and low temperature circulating impact system based on perfluoropolyether working fluid is characterized in that: the method comprises the following steps:
a container for holding the perfluoropolyether working fluid of claim 1;
the temperature control unit is used for controlling the temperature of the perfluoropolyether working fluid in the container;
and the fluid circulating pump is used for circulating the perfluoropolyether working fluid in the container.
5. The high and low temperature cyclic impingement system of claim 4, wherein: the container is made of stainless steel, aluminum alloy or plastic steel composite materials.
6. A high-low temperature cycle impact test method based on perfluoropolyether working fluid is characterized by comprising the following steps: immersing a high-low temperature impact test sample piece in a container containing the perfluoropolyether working fluid as described in claim 1, heating or cooling the perfluoropolyether working fluid in the container by using a temperature control unit, and starting a fluid circulating pump of the container to circulate the perfluoropolyether working fluid.
7. The high and low temperature cycle impact test method of claim 6, wherein: the temperature control unit is a temperature controller with the functions of rapid heating and cooling, and the temperature control precision is less than or equal to +/-0.5 ℃.
8. The high and low temperature cycle impact test method of claim 6, wherein: the temperature range of the high-temperature and low-temperature circulation of the perfluoropolyether working fluid is-50 ℃ to 200 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101589077A (en) * | 2006-11-30 | 2009-11-25 | 索维索莱克西斯公开有限公司 | Fluorinated lubricants |
| CN107653037A (en) * | 2017-09-26 | 2018-02-02 | 中国石油化工股份有限公司 | A kind of Perfluoropolyether lubricant and preparation method thereof |
| CN114149318A (en) * | 2021-10-28 | 2022-03-08 | 浙江诺亚氟化工有限公司 | Method for synthesizing low-molecular-weight acyl fluoride by oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature |
| CN114456369A (en) * | 2021-12-31 | 2022-05-10 | 西安近代化学研究所 | Binary copolymerization perfluoropolyether and preparation method thereof |
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| CN101589077A (en) * | 2006-11-30 | 2009-11-25 | 索维索莱克西斯公开有限公司 | Fluorinated lubricants |
| CN107653037A (en) * | 2017-09-26 | 2018-02-02 | 中国石油化工股份有限公司 | A kind of Perfluoropolyether lubricant and preparation method thereof |
| CN114149318A (en) * | 2021-10-28 | 2022-03-08 | 浙江诺亚氟化工有限公司 | Method for synthesizing low-molecular-weight acyl fluoride by oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature |
| CN114456369A (en) * | 2021-12-31 | 2022-05-10 | 西安近代化学研究所 | Binary copolymerization perfluoropolyether and preparation method thereof |
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