Fluorine-containing organic silicon antifogging additive as well as preparation method and application thereof

Abstract

The invention relates to the technical field of advanced organic silicon coating production, and discloses a fluorine-containing organic silicon antifogging additive as well as a preparation method and application thereof. The preparation method comprises the following steps: under the protection of nitrogen, introducing a fluorine-containing alkyl chain segment into hydrogen-containing silicone oil through a hydrosilylation reaction by using a platinum catalyst to obtain fluorinated hydrogen-containing silicone oil, adding double-end vinyl silicone oil into the fluorinated hydrogen-containing silicone oil, continuously reacting by changing reaction conditions, and purifying after the reaction to obtain the fluorine-containing silicone oil. The fluorine-containing organic silicon antifogging additive is obtained. The anti-fogging additive is moderate in viscosity and stable in property, fog drops generated during high-speed coating can be effectively reduced after the anti-fogging additive is added into organic silicon coating liquid, the atomization inhibition efficiency is higher than 75% and can reach 96.7% to the maximum, the stripping force and transparency of an anti-sticking coating cannot be obviously influenced after curing, and the anti-fogging effect is good. The coating has the advantages of being good in compatibility, small in addition amount and small in influence on the coating performance.

Description

Technical Field

[0001] The invention relates to the technical field of anti-fog additives for organosilicon coatings, and in particular to a fluorine-containing organosilicon anti-fog additive and a preparation method and application thereof. Background Art

[0002] In the coating process of silicone release coating, in order to improve production efficiency, the coating speed is usually increased as much as possible. However, at high roller coating speed, atomization (smoke or aerosol formed by small liquid particles) will appear at the nip of two coating rollers. The generation of fog will not only cause uneven coating and affect the surface properties of the coating, but also have an adverse effect on the human respiratory system, endangering the occupational health of workers. Antifogging agent additives refer to adding other ingredients to the coating liquid to achieve the effect of reducing the formation of fog during high-speed coating. At present, the existing antifogging additives on the market are mainly divided into two categories, namely, the addition type of branched siloxane composition made by hydrosilane addition reaction and the condensation type of branched siloxane antifogging additive produced by MT siloxane and MQ siloxane polycondensation. CN112280047A obtains a cross-linked antifogging additive containing branching points by hydrosilane addition reaction of vinyl polysiloxane and terminal hydrogen polysiloxane. CN101535427B copolymerizes MT and MQ siloxanes with at least two unsaturated hydrocarbon groups with a mixture of silicon-hydrogen compound components to form a branched polysiloxane composition as a "fog suppressant". However, these products have problems such as easy gelation, excessive viscosity, high addition amount, and affecting coating performance after addition. CN111440320A prepared an anti-fog additive. Although the anti-fog agent has a fogging inhibition rate of 95.5%, the anti-fog additive significantly affects the peeling force after curing, and the relative peeling force is increased by 20.7 to 60.4%, which significantly affects the anti-sticking performance of the release layer. Therefore, it is necessary to prepare an anti-fog additive that can ensure a better anti-fog effect at a lower addition amount and will not significantly affect the peeling force and transparency of the anti-sticking coating after curing, which has broad application prospects. Summary of the invention

[0003] In order to solve the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a method for preparing a fluorine-containing organosilicon anti-fog additive.

[0004] Another object of the present invention is to provide a fluorine-containing organosilicon anti-fog additive obtained by the above preparation method.

[0005] Another object of the present invention is to provide an application of the above-mentioned fluorine-containing organosilicon anti-fog additive.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A method for preparing a fluorine-containing organosilicon anti-fog additive comprises the following steps:

[0008] (1) Under nitrogen protection, a fluorinated alkyl chain segment is introduced into the hydrogen-containing silicone oil by a hydrosilylation reaction using a platinum catalyst to obtain a fluorinated hydrogen-containing silicone oil;

[0009] (2) adding double-terminal vinyl silicone oil to the fluorinated hydrogenated silicone oil and changing the conditions to continue the reaction, and purifying after the reaction is completed to obtain a partially cross-linked translucent oily fluorinated polysiloxane anti-fog additive, namely, a fluorinated organosilicon anti-fog additive.

[0010] Preferably, the fluorinated alkyl chain segment in step (1) refers to a fluorinated alkyl chain segment with a terminal C=C bond, including perfluoroalkylethylene R f CH=CH2, perfluoroalkylpropylene R f CH2CH=CH2 or fluorinated alkane R with allyl oxygen f At least one of CH2CH2OCH2CH=CH2, wherein R f Perfluoroalkyl side chain (C n F 2n+1 -), n is an integer from 1 to 15. Specifically, for example: including C 12 F 25 -CH=CH2、C 10 F 21 -CH2CH=CH2、C8F 17 -CH2CH2OCH2CH=CH2.

[0011] Preferably, the molar ratio of the total Si-H bonds of the hydrogen-containing silicone oil to the total C=C bonds in the system is 1:1 to 1:6, more preferably 1:1.1;

[0012] The total C=C bonds are the sum of the terminal C=C bonds in the fluorinated alkyl segments and the C=C bonds in the double-terminal vinyl silicone oil;

[0013] The molar ratio of terminal C=C bonds to total C=C bonds in the fluorinated alkyl segment is 3:11 to 7:11, more preferably 5:11 to 7:11.

[0014] Preferably, the platinum catalyst described in step (1) includes at least one of H2PtCl6·6H2O, PtCl4, Na2PtCl4·4H2O, platinum-olefin complex (karstedt catalyst), platinum-alcohol complex, and platinum-ketone complex; including the reaction product of H2PtCl6·6H2O and ethanol, isopropanol, platinum-vinylsiloxane complex, for example: platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex (karstedt catalyst), tris(methylenedipyridinium) platinum dichloride or norbornene platinum dichloride. More preferably, the platinum concentration is 1000-10000ppm, the dispersion medium is at least one of isopropanol, methyl silicone oil, toluene, and xylene, and the amount of platinum is 5-50ppm of the reaction system.

[0015] Preferably, the hydrogen-containing silicone oil in step (1) refers to a polydimethylsiloxane-polymethylhydrogensilane copolymer, and its structural formula is as follows:

[0016]

[0017] Wherein k is an integer from 10 to 50.

[0018] More preferably, the hydrogen-containing silicone oil contains 0.2 to 1.6 wt % of active hydrogen.

[0019] Preferably, the specific steps of step (1) are as follows: under nitrogen protection, adding a platinum catalyst to the fluorinated alkyl segment, activating the catalyst, adding a solvent to adjust the catalyst concentration, and then adding hydrogen-containing silicone oil to react to obtain fluorinated hydrogen-containing silicone oil;

[0020] Preferably, the reaction conditions of step (1) include: heating from room temperature to 70-90° C. to activate the catalyst for 10-30 min, followed by stirring at 500-1000 rpm and reacting at 60-90° C. for 2-10 h.

[0021] Preferably, the double-terminated vinyl silicone oil in step (2) has the following structural formula:

[0022]

[0023] Wherein R1 is selected from methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, phenyl, benzyl, tolyl, xylyl, phenethyl, trifluoromethyl, trifluoropropyl, perfluoropropyl and polyether alkoxy; R2 is a group containing at least one of alkyl, ester, carboxyl, halogenated alkyl, aromatic hydrocarbon and ether groups having 1 to 18 carbon atoms; and m is an integer from 0 to 1000.

[0024] More preferably, the relative molecular mass of the double-terminal vinyl silicone oil is in the range of 3000 to 10000, and the shear viscosity is in the range of 100 to 600 mPa·s.

[0025] Preferably, the reaction conditions of step (2) include: stirring at a high speed of 1000-2000 rpm, maintaining a temperature of 70-90° C. for 2-5 hours;

[0026] The purification process in step (2) at least includes vacuum distillation to remove solvents and low boiling points, under the following conditions: vacuum distillation at 70-90° C. for 2-12 hours, with a vacuum degree of -0.0999 to -0.093 MPa.

[0027] Preferably, a small amount of catalyst inhibitor can be added to the product to ensure stable storage of the product in a complex environment, and the inhibitor is at least one of monomethyl maleate, 1-ethynyl-cyclohexane-1-ol, 2-methyl-3-butynyl-2-ol, and 2,7-dimethyloct-1-ynyl-6-enyl-3-ol.

[0028] The above preparation method prepares a fluorine-containing organosilicon anti-fog additive.

[0029] Preferably, the viscosity of the fluorine-containing organosilicon anti-fog additive is 250 to 650 mPa·s.

[0030] Application of the above fluorine-containing organosilicon anti-fog additive in organosilicon coatings.

[0031] Preferably, the added mass percentage of the fluorine-containing organosilicon anti-fog additive during the application is 2 to 5 wt %.

[0032] The present invention has the following advantages and beneficial effects:

[0033] (1) The present invention provides a fluorine-containing organosilicon anti-fog additive, which, when added to an organosilicon coating, can effectively reduce the atomization phenomenon (smoke or aerosol formed by small liquid particles) that occurs at the nip of a coating roller, and the atomization suppression efficiency is higher than 75%, which is sufficient to meet the requirements of practical applications, and can reach up to 96.7%.

[0034] (2) The fluorine-containing organosilicon anti-fog additive provided by the present invention has the advantages of good compatibility, small addition amount, and small effect on coating performance compared with existing anti-fog agents. Specifically, firstly, because the raw materials of each step of the anti-fog additive of the present invention are mainly silicone oil, the mutual solubility with the cross-linkable organosilicon coating composition is good, and no turbidity will occur after addition, and the transparency of the coating will not be affected. Secondly, because the surface tension of the slurry is adjusted by introducing fluorine-containing groups in the synthesis of the present invention, the anti-fog effect can be exerted at a lower viscosity, which improves the problem of excessive viscosity of some existing anti-fog agents. Finally, due to the spontaneous surface enrichment of fluorine-containing substances after curing into a coating, the peeling force of the coating surface is effectively adjusted, and the peeling force of the coating surface is only increased by 0.89% to 5.06%, which improves the problem that some existing anti-fog agents add and cure to significantly increase the peeling force of the coating after aging. At the same time, the release force can also be increased by 26.9% to 44.8% (Examples 1 and 2), and the product can be adjusted from light release to heavy release under the premise of ensuring a high atomization inhibition rate, which has certain application value.

[0035] (3) The fluorine-containing organosilicon anti-fog additive of the present invention has low viscosity and does not gel, is easy to produce, transfer and use, is suitable for industrial application, and provides theoretical and practical support for the future inhibition of organosilicon fogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The nuclear magnetic spectrum of the hydrogen-containing silicone oil used in the present invention;

[0037] Figure 2 This is the NMR spectrum of the fluorine-containing organosilicon anti-fog additive prepared in Example 6 of the present invention;

[0038] Figure 3 The infrared spectrum of the hydrogen-containing silicone oil used in the present invention;

[0039] Figure 4 This is the infrared spectrum of the fluorine-containing silicone anti-fog additive prepared in Example 6 of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto. For process parameters not particularly noted, conventional techniques may be used.

[0041] Hydrogenated silicone oil PMHS, the structural formula is k is an integer from 10 to 50.

[0042] Embodiment 1:

[0043] Under nitrogen protection, 1H, 1H, 2H, 3H, 3H, -perfluoro-1-undecene (4.23 g, 9 mmol) was added to a flask with a reflux condenser, and a 1000 ppm H2PtCl6·6H2O catalyst was added dropwise and the temperature was raised from room temperature to 90°C for activation for 15 min. After adding solvent toluene to adjust the catalyst concentration of the system to 25 ppm, a hydrogen-containing silicone oil PMHS (3.95 g, Si-H content 30 mmol) with a hydrogen content of 0.75 wt% was added dropwise, and the reaction was stirred at 90°C (500 rpm) for 2 h to obtain a fluorinated hydrogen-containing silicone oil, and then the double-terminal vinyl silicone oil PDMS-vi (92.66 g, C=C content 24 mmol) with a viscosity of 200 mPa·s was slowly added dropwise to the system, and the reaction was carried out at 90°C with high-speed stirring (1500 rpm) for 2 h. After the reaction was completed, the temperature was raised to 70-75° C. under reduced pressure with a vacuum degree of -0.097 MPa and the impurities were removed by distillation for 5 hours to obtain a fluorine-containing organosilicon anti-fog additive.

[0044] Embodiment 2:

[0045] Under nitrogen protection, 1H, 1H, 2H, 3H, 3H, -perfluoro-1-nonene (5.63 g, 13.5 mmol) was added to a flask with a reflux condenser, and a Karstedt catalyst with a concentration of 500 ppm was added dropwise, and the temperature was raised from room temperature to 80°C for activation for 10 min. After adding solvent xylene to adjust the catalyst concentration of the system to 20 ppm, a hydrogen-containing silicone oil PMHS (5.93 g, Si-H content 45 mmol) with a hydrogen content of 0.75 wt% was added dropwise, and the reaction was stirred at 80°C (500 rpm) for 2 h to obtain a fluorinated hydrogen-containing silicone oil, and then the double-terminal vinyl silicone oil PDMS-vi (138.99 g, C=C content 36 mmol) with a viscosity of 200 mPa·s was slowly added dropwise to the system, and the reaction was carried out at 80°C with high-speed stirring (1500 rpm) for 1 h. After the reaction was completed, the temperature was raised to 70-75° C. under reduced pressure with a vacuum degree of -0.097 MPa and the impurities were removed by distillation for 5 hours to obtain a fluorine-containing organosilicon anti-fog additive.

[0046] Embodiment 3:

[0047] Under nitrogen protection, 1H, 1H, 2H-perfluoro-1-decene (6.83 g, 15 mmol) was added to a flask with a reflux condenser, and a Karstedt catalyst with a concentration of 500 ppm was added and the temperature was raised from room temperature to 80°C for activation for 20 min. After adding solvent toluene to adjust the catalyst concentration of the system to 15 ppm, a hydrogen-containing silicone oil PMHS (6.00 g, Si-H content 30 mmol) with a hydrogen content of 0.5 wt% was added dropwise, and the reaction was stirred at 90°C (500 rpm) for 8 hours to obtain a fluorinated hydrogen-containing silicone oil, and then a double-terminal vinyl silicone oil PDMS-vi (69.49 g, C=C content 18 mmol) with a viscosity of 250 mPa·s was slowly added to the system, and the reaction was carried out at 80°C with high-speed stirring (2000 rpm) for 4 hours. After the reaction was completed, the temperature was raised to 75-80°C under a vacuum of -0.099 MPa and impurities were removed by distillation for 12 hours to obtain a fluorinated organosilicon anti-fog additive.

[0048] Embodiment 4:

[0049] Under nitrogen protection, 1H,1H,2H-perfluoro-1-octene (5.30 g, 15 mmol) was added to a flask with a reflux condenser, and a 1000 ppm H2PtCl6·6H2O catalyst was added dropwise and the temperature was raised from room temperature to 90°C for activation for 15 min. After adding solvent xylene to adjust the catalyst concentration of the system to 20 ppm, a hydrogen-containing silicone oil PMHS (6.00 g, Si-H content 30 mmol) with a hydrogen content of 0.5 wt% was added dropwise, and the reaction was stirred at 80°C (500 rpm) for 8 h to obtain a fluorinated hydrogen-containing silicone oil, and then a double-terminal vinyl silicone oil PDMS-vi (69.49 g, C=C content 18 mmol) with a viscosity of 250 mPa·s was slowly added dropwise to the system, and the reaction was carried out at 80°C with high-speed stirring (2000 rpm) for 4 h. After the reaction is completed, the temperature is raised to 75-80° C. under reduced pressure with a vacuum degree of -0.099 MPa to remove impurities by distillation for 12 hours to obtain a fluorine-containing organosilicon anti-fog additive.

[0050] Embodiment 5:

[0051] Under nitrogen protection, 1H, 1H, 2H-perfluoro-1-decene (18.73 g, 42 mmol) was added to a flask with a reflux condenser, and a Karstedt catalyst with a concentration of 500 ppm was added and the temperature was raised from room temperature to 80°C for activation for 20 min. After adding solvent toluene to adjust the catalyst concentration of the system to 15 ppm, a hydrogen-containing silicone oil PMHS (7.89 g, Si-H content 60 mmol) with a hydrogen content of 0.8 wt% was added dropwise, and the reaction was stirred at 80°C (500 rpm) for 2 h to obtain a fluorinated hydrogen-containing silicone oil, and then a double-terminal vinyl silicone oil PDMS-vi (92.66 g, C=C content 24 mmol) with a viscosity of 200 mPa·s was slowly added to the system, and the reaction was carried out at 80°C with high-speed stirring (1500 rpm) for 1 h. After the reaction was completed, the temperature was raised to 75-80°C under a vacuum of -0.097 MPa and impurities were removed by distillation for 10 hours to obtain a fluorinated organosilicon anti-fog additive.

[0052] Embodiment 6:

[0053] Under nitrogen protection, 1H,1H,2H-perfluoro-1-octene (14.54 g, 42 mmol) was added to a flask with a reflux condenser, and a 1000 ppm H2PtCl6·6H2O catalyst was added dropwise and the temperature was raised from room temperature to 90°C for activation for 20 min. After adding solvent toluene to adjust the catalyst concentration of the system to 25 ppm, a hydrogen-containing silicone oil PMHS (7.89 g, Si-H content 60 mmol) with a hydrogen content of 0.8 wt% was added dropwise, and the reaction was stirred at 90°C (500 rpm) for 3 h to obtain a fluorinated hydrogen-containing silicone oil, and then the double-terminal vinyl silicone oil PDMS-vi (92.66 g, C=C content 24 mmol) with a viscosity of 200 mPa·s was slowly added dropwise to the system, and the reaction was carried out at 90°C with high-speed stirring (1500 rpm) for 2 h. After the reaction is completed, the temperature is raised to 75-80° C. under reduced pressure with a vacuum degree of -0.097 MPa to remove impurities by distillation for 10 hours to obtain a fluorine-containing organosilicon anti-fog additive.

[0054] Figure 2 This is the NMR spectrum of the fluorine-containing anti-fog additive prepared in Example 6. Figure 4 Its infrared spectrum. Figure 2 In the spectrum results, the appearance of H at the perfluorinated chain segment grafting sites at δ:2-3 indicates that the fluorinated chain segment grafting is successful, and the basic disappearance of the Si-H peak at δ:4-5 indicates that the hydrosilation reaction has been completed, that is, in addition to the successful grafting, the remaining active hydrogen has also fully reacted with PDMS-Vi. Figure 4 Medium 2160cm -1 The disappearance of the Si-H characteristic stretching vibration absorption peak nearby can also be used to judge that the hydrosilylation has been completed. -1 and 1220cm -1The stretching vibration of CF nearby also confirms the successful grafting of the fluorine-containing segment.

[0055] Atomization suppression efficiency test:

[0056] The anti-fog additives in the above examples 1-6 were subjected to anti-fog tests according to the method described in the present invention. The fog in the silicone coating process is aerosol or liquid small particles. The present invention uses TSI brand DUSTTRAK2 dust detector to measure the real-time PM2.5 content. Its detection principle is light scattering method. The measurement time is set to 5min. At this time, the error between the equilibrium value and the average value does not exceed 5%. The average PM2.5 concentration P (mg / m 3 ), the specific test steps are as follows:

[0057] (1) Under ventilation conditions, add 100-130 mL of double-ended vinyl silicone oil with a viscosity of 200 mPa·s to a 1L three-necked flask. First, use a DUSTTRAK2 dust detector to detect the PM2.5 concentration in the air. Then, use a mechanical stirrer to stir at a speed of 1200 r / min. Insert the DUSTTRAK2 detector probe into the mouth of the three-necked flask at a fixed position of 2 cm to detect the real-time concentration of PM2.5. The concentration difference between the two measurements is used as the atomization blank in the normal high-speed shear process to deduct the PM2.5 concentration in the air. Turn off the stirrer and record the concentration difference m0 of the two PM2.5 measurements.

[0058] (2) Add 2% to 5% by mass of the fluorine-containing anti-fog additive prepared in Example 1-6, turn on the stirrer, stir at a speed of 1200 r / min for 5 minutes, quickly measure the concentration of PM2.5 in the air within 5 minutes, and then insert the DUSTTRAK2 detector probe into the mouth of the three-necked flask at a fixed position of 2 cm to detect the concentration of PM2.5. Turn off the stirrer and record the difference m1 between the two PM2.5 concentration measurements.

[0059] (3) Calculate the atomization suppression efficiency fe according to the following formula. Each sample was measured 5 times in parallel and the average value was taken. The results are shown in Table 1.

[0060]

[0061] Aging peel force effect test:

[0062] The anti-fog additives in the above Examples 1-6 were tested for their peeling force effects according to the method described in the present invention. Low surface tension and anti-sticking (release) performance are the core properties of release films. The present invention will add them into a release film and formulation of a manufacturer and use a thermal curing method to form a film, and test their peeling force effects. The specific test steps are as follows:

[0063] (1) The fluorine-containing anti-fog additive prepared in Example 1-6 was added to a solvent-free silicone release agent (Guangzhou Chemical Co., Ltd., Chinese Academy of Sciences) at 4 wt % to prepare a coating solution, and the coating solution was cured at 160° C. for 5 s using a five-roll coating method.

[0064] (2) Aging peel strength test method: TESA 7475 tape is attached to the silicon-coated release paper to be tested according to the standard method, and the tape is cut into strips according to the shape of the tape. A standard stainless steel bar is pressed at 70°C for 20 hours (20g / cm 2 ), after being placed for 4 hours, the tensile force at a pulling speed of 30 cm / min and a pulling angle of 180 degrees is the release force.

[0065] (3) Examples 1-6 have a total of six groups of anti-fog additives. Five samples were coated and cured in each group and tested, and the average value was taken. A blank control was set. The results are shown in Table 1.

[0066] As shown in Table 1, when 4% of the anti-fog additive of Example 3 is added, the atomization suppression efficiency reaches 91.1%, and the effect on the aging peeling force is minimal, which is only increased by 0.89%; when 4% of the anti-fog additive of Example 6 is added, the atomization suppression efficiency can reach 96.7%, and the aging peeling force is only increased by 5.06%. It is achieved to ensure a good anti-fog effect at a relatively low addition amount, and at the same time effectively adjust the peeling force of the coating surface after curing, and improve the problem that some existing anti-fog agents significantly increase the peeling force of the coating after curing.

[0067] Table 1: Anti-fog performance and peeling force effect of fluorinated silicone anti-fog additives (25℃)

[0068]

[0069] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for preparing a fluorine-containing organosilicon anti-fog additive, characterized in that: The steps include: (1) Under nitrogen protection, a fluorinated alkyl chain segment is introduced into the hydrogen-containing silicone oil by a hydrosilylation reaction using a platinum catalyst to obtain a fluorinated hydrogen-containing silicone oil; (2) adding double-terminal vinyl silicone oil to the fluorinated hydrogenated silicone oil and changing the reaction conditions to continue the reaction, and purifying after the reaction to obtain a fluorinated organosilicon anti-fog additive.

2. The method for preparing the fluorine-containing organosilicon anti-fog additive according to claim 1, characterized in that: The fluorinated alkyl chain segment in step (1) refers to a fluorinated alkyl chain segment with a terminal C=C bond, including perfluoroalkylethylene R f CH=CH2, perfluoroalkylpropylene R f CH2CH=CH2 or fluorinated alkane R with allyl oxygen f At least one of CH2CH2OCH2CH=CH2, wherein R f Perfluoroalkyl side chain C n F 2n+1 -, n is an integer from 1 to 15.

3. The method for preparing the fluorine-containing organosilicon anti-fog additive according to claim 2, characterized in that: The molar ratio of the total Si-H bonds of the hydrogen-containing silicone oil to the total C=C bonds in the system is 1:1 to 1:6; The total C=C bonds are the sum of the terminal C=C bonds in the fluorinated alkyl segments and the C=C bonds in the double-terminal vinyl silicone oil; The molar ratio of the terminal C=C bonds to the total C=C bonds in the fluorinated alkyl chain segment is 3:11 to 7:

11.

4. The method for preparing the fluorine-containing organosilicon anti-fog additive according to claim 1, characterized in that: The platinum catalyst described in step (1) includes at least one of H2PtCl6·6H2O, PtCl4, Na2PtCl4·4H2O, a platinum-olefin complex, a platinum-alcohol complex, and a platinum-ketone complex.

5. The method for preparing the fluorine-containing organosilicon anti-fog additive according to any one of claims 1 to 4, characterized in that: The hydrogen-containing silicone oil in step (1) refers to a polydimethylsiloxane-polymethylhydrogensilane copolymer, and its structural formula is as follows: Wherein k is an integer from 10 to 50.

6. The method for preparing the fluorine-containing organosilicon anti-fog additive according to claim 5, characterized in that: The specific steps of step (1) are as follows: under nitrogen protection, adding a platinum catalyst to the fluorinated alkyl segment, activating the catalyst and adding a solvent to adjust the catalyst concentration, and then adding hydrogen-containing silicone oil to react to obtain fluorinated hydrogen-containing silicone oil; The reaction conditions in step (1) include: heating from room temperature to 70-90° C. to activate the catalyst for 10-30 minutes, followed by stirring at 500-1000 rpm and reacting at 60-90° C. for 2-10 hours.

7. The method for preparing the fluorine-containing organosilicon anti-fog additive according to claim 6, characterized in that: The double-terminal vinyl silicone oil in step (2) has the following structural formula: Wherein R1 is selected from methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, phenyl, benzyl, tolyl, xylyl, phenethyl, trifluoromethyl, trifluoropropyl, perfluoropropyl and polyether alkoxy; R2 is a group containing at least one of alkyl, ester, carboxyl, halogenated alkyl, aromatic hydrocarbon and ether groups having 1 to 18 carbon atoms; and m is an integer from 0 to 1000.

8. The method for preparing the fluorine-containing organosilicon anti-fog additive according to claim 1, characterized in that: The reaction conditions in step (2) include: stirring at a high speed of 1000-2000 rpm, maintaining a temperature of 70-90° C. for 1-5 hours; The purification process in step (2) at least includes vacuum distillation to remove solvents and low boiling points, under the following conditions: vacuum distillation at 70-90° C. for 2-12 hours, with a vacuum degree of -0.0999 to -0.093 MPa.

9. The fluorine-containing organosilicon anti-fog additive prepared by the method according to any one of claims 1 to 8.

10. Use of the fluorine-containing anti-fog additive according to claim 9 in coating of a crosslinkable siloxane coating composition.

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