Preparation method of OPSZ / PFDTES composite anti-sticking coating as well as product and application of OPSZ / PFDTES composite anti-sticking coating

Abstract

The invention discloses a preparation method of an OPSZ / PFDTES composite anti-sticking coating as well as a product and application of the OPSZ / PFDTES composite anti-sticking coating, and belongs to the technical field of functional coating preparation. According to the preparation method, the OPSZ bottom layer and the PFDTES top layer are sequentially prepared through a dip-coating method, and the composite coating is formed through pre-curing and high-temperature curing, specifically, the surface of a pretreated base material is coated with an OPSZ-ethyl acetate mixed solution, the surface is coated with a pre-hydrolyzed PFDTES hydrolysate after pre-curing, and the OPSZ / PFDTES composite anti-sticking coating can be obtained after permeation and curing. The OPSZ / PFDTES composite anti-sticking coating prepared by the invention has excellent comprehensive properties: (1) the stripping strength of an adhesive tape is reduced, the adhesive force is increased, the water contact angle is increased, and the coating has super-lyophobic property and broad-spectrum anti-sticking property, and can effectively repel pollutants such as water, oil, mud and the like; and (2) after a stripping cycle test, the performance is only slightly attenuated, and the durability is excellent.

Description

Technical Field

[0001] This invention belongs to the field of functional coating preparation technology, and relates to a method for preparing an OPSZ / PFDTES composite anti-stick coating, its products, and applications. Background Technology

[0002] Anti-stick coatings, as functional surface materials, reduce the adhesion of materials to other substances and are widely used in industrial production, medical devices, and daily necessities. However, traditional anti-stick coatings, such as polytetrafluoroethylene (PTFE) coatings, suffer from insufficient bonding strength with the substrate and limited ability to repel oily substances, making it difficult to meet the requirements of complex working conditions such as high-speed cutting and oily environments, thus limiting their widespread use.

[0003] In recent years, polysilazane (OPSZ)-based coatings have become an important component in the preparation of wear-resistant coatings due to their excellent high-temperature resistance, mechanical properties, and chemical stability. They readily cure in air to form a dense SiO2 film rich in hydroxyl groups, which can firmly bond with many hydroxyl-containing substrates. Meanwhile, fluorinated silanes, such as 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES), exhibit significant advantages in hydrophobic and oleophobic modification due to their low surface energy. Currently, although some researchers have attempted to combine fluorinated components with PPSZ to prepare anti-stick coatings, most methods involve modifying the PPSZ with fluorinated substances, then dissolving it in solvents such as ethyl acetate before coating it onto the substrate surface. In these processes, some of the fluorinated substances directly contact the underlying substrate, reducing the bonding strength between the coating and the substrate, making it difficult to obtain coatings that simultaneously possess excellent anti-stick properties, adhesion, and durability.

[0004] Therefore, how to prepare a composite coating that simultaneously possesses excellent hydrophobicity, non-stick properties, strong adhesion, and durability has become a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0005] In view of this, one objective of the present invention is to provide a method for preparing an OPSZ / PFDTES composite anti-stick coating; another objective of the present invention is to provide an OPSZ / PFDTES composite anti-stick coating; and a third objective of the present invention is to provide an application of the OPSZ / PFDTES composite anti-stick coating in the preparation of superhydrophobic, anti-stick, or anti-fouling coating materials.

[0006] To achieve the above objectives, the present invention provides the following technical solution: 1. A method for preparing an OPSZ / PFDTES composite anti-stick coating, the method comprising the following steps: (1) Preparation of OPSZ undercoat: After mixing organopolysilazane (OPSZ) with ethyl acetate evenly, it is coated onto the surface of the pretreated substrate by dip coating. After dip coating, it is taken out and pre-cured to obtain a pre-cured OPSZ undercoat. (2) Preparation of PFDTES prehydrolysate: 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES), anhydrous ethanol, water and ammonia were mixed and stirred at room temperature to complete the prehydrolysate and obtain PFDTES hydrolysate; (3) Preparation of PFDTES top coating: The PFDTES hydrolysate prepared in step (2) is coated onto the surface of the OPSZ bottom coating prepared in step (1) by dip coating method to obtain the coated substrate; (4) Curing of composite coating: After curing the substrate coated in step (3), the OPSZ / PFDTES composite anti-stick coating can be obtained by cooling.

[0007] Preferably, in step (1), the pretreatment method of the substrate is as follows: the substrate is successively sanded with sandpaper, ultrasonically cleaned with acetone, rinsed with deionized water and anhydrous ethanol, and then dried to obtain the pretreated substrate.

[0008] More preferably, the substrate is a material containing hydroxyl groups on its surface; The sandpaper has a mesh size of 400, and the ultrasonic cleaning time with acetone is 10-30 minutes. The drying conditions are as follows: drying at 80°C for 10-30 minutes.

[0009] More preferably, the substrate is a stainless steel blade or glass.

[0010] Preferably, in step (1), the mass ratio of the organopolysilazane (OPSZ) to ethyl acetate is 0.2~1:4, the dipping time is 0.5~4 h, the pre-curing temperature is 30~80℃, and the pre-curing time is 20~60 min.

[0011] Preferably, in step (2), the mass ratio of 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES), anhydrous ethanol, water and ammonia is 0.52 to 25.95: 22.95: 2.55: 0.45.

[0012] Preferably, in step (3), the dipping time is 0.5 to 4 hours.

[0013] Preferably, in step (4), the curing temperature is 80 to 200°C and the curing time is 0.5 to 4 hours.

[0014] 2. The OPSZ / PFDTES composite anti-stick coating prepared according to the above preparation method.

[0015] 3. Application of the above-mentioned OPSZ / PFDTES composite anti-stick coating in the preparation of superhydrophobic, anti-stick or anti-fouling coating materials.

[0016] The beneficial effects of this invention are as follows: (1) This invention discloses a method for preparing an OPSZ / PFDTES composite anti-stick coating. The preparation method has clear process parameters and strong controllability. By optimizing key parameters such as PFDTES concentration, immersion time, curing temperature and curing time, the coating performance can be precisely controlled, solving the problems of instability and large performance fluctuation of traditional composite coating processes. At the same time, the preparation process adopts the immersion method, which is simple to operate, efficient, and easy to scale up for industrial production.

[0017] (2) The OPSZ / PFDTES composite anti-stick coating prepared by the preparation method of the present invention has many excellent comprehensive properties: the coating and the substrate are bonded by Me-O-Si covalent bonds (Me-metal atoms), the coating and the substrate are firmly bonded, not easy to fall off, and the bonding strength is high, with the adhesion reaching grade 5B; the coating has good anti-tape adhesion properties, and the tape peel strength tested at 90° is as low as 0.34N / cm; it has excellent superhydrophobic properties, with a water contact angle of up to 146.7°; it also has excellent self-cleaning properties, is resistant to mud pollution, and has good anti-graffiti properties; it has excellent durability, and after 30 days of durability testing and 100 tape peel cycle tests, the water contact angle decay rate is less than 1.4%, and the peel strength change rate does not exceed 5.7%.

[0018] (3) The composite anti-stick coating prepared by the present invention has a wide range of applications. It can be used in industrial cutting tools to reduce residual adhesive adhesion; it can be used on the inner wall of pipes and the surface of industrial equipment in oily environments to reduce conveying friction and achieve anti-fouling protection; it can solve the problems of poor adhesion to the substrate, easy peeling, lack of durability and short service life of traditional coatings during use, and has important practical application value.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings, wherein: Figure 1The tape peel strength test results are as follows: for the uncoated stainless steel blade substrate, the control group pure OPSZ coating prepared in Example 5, and the OPSZ / PFDTES composite anti-stick coating prepared in Example 1 with an PFDTES addition amount of 6.48 g; Figure 2 The image shows the cross-cut adhesion test results of the OPSZ / PFDTES composite anti-stick coating prepared in Example 1 with an PFDTES addition amount of 6.48 g, where a is before tape peeling and b is after tape peeling. Figure 3 The XPS full spectrum and F 1s and Si 2p spectra of the OPSZ / PFDTES composite anti-stick coating prepared when the PFDTES addition amount was 6.48 g in Example 1 are shown, where a is the full spectrum, b is the F 1s spectrum, and c is the Si 2p spectrum. Figure 4 The water contact angle (a~d) and peel strength (e~h) of the OPSZ / PFDTES composite anti-stick coating prepared under different PFDTES concentrations in Example 1, different immersion times of the PFDTES top coating in Example 2, different curing temperatures during the curing of the composite coating in Example 3, and different curing times during the curing of the composite coating in Example 3 are shown. Figure 5 Comparison of mud contamination resistance test (a, b) and ink graffiti resistance test (c, d) for uncoated stainless steel blades and OPSZ / PFDTES composite anti-stick coating prepared with PFDTES addition amount of 6.48g in Example 1. Figure 6 The OPSZ / PFDTES composite anti-stick coating prepared in Example 1 with an PFDTES addition amount of 6.48 g was tested for aging resistance. The changes in the water contact angle and peel strength of the coating with the aging resistance test time (a) and the number of tape peel cycles (b) were observed during the aging resistance test, after 0-30 days of damp heat aging (temperature 25℃, relative humidity 60%) and 0-100 tape peel cycles. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] Example 1 An OPSZ / PFDTES composite anti-stick coating is prepared by the following steps: (1) Substrate pretreatment: Select stainless steel blades as substrates, and polish the surface with 400 grit sandpaper to remove the oxide layer; place the polished blades in acetone for ultrasonic cleaning for 15 minutes to remove surface oil; rinse with deionized water 3 times, and then dry in an 80℃ oven for 30 minutes for later use. (2) Preparation of OPSZ undercoat: Mix 2 g OPSZ with 8 g ethyl acetate and stir for 30 min to prepare an OPSZ-ethyl acetate mixture with a mass fraction of 20% to ensure that OPSZ is fully dissolved; use dip coating to coat the mixture onto the surface of the pretreated stainless steel blade for 2 h. After dip coating, take out the blade and pre-cur it at 60℃ for 30 min to obtain the OPSZ undercoat. (3) Preparation of hydrolysates with different PFDTES concentrations: Weigh different masses (0.52g, 1.65g, 2.88g, 4.58g, 6.48g, 25.95g) of PFDTES and mix them with 22.95g of anhydrous ethanol, 2.55g of deionized water and 0.45g of concentrated ammonia. Stir at room temperature for 0.5h to complete the pre-hydrolysis of PFDTES and obtain PFDTES hydrolysates with concentrations of 2%, 6%, 10%, 15%, 20% and 50%, respectively. (4) Preparation of PFDTES top coating: The above PFDTES hydrolysate was coated onto the surface of the OPSZ bottom coating by dip coating method, and the dip coating time was 2h; (5) Curing of composite coating: The coated stainless steel blade is placed in an oven and heated from room temperature to 200°C at a heating rate of 5°C / min. It is cured at 200°C for 2 hours and then naturally cooled to room temperature to obtain the OPSZ / PFDTES composite anti-stick coating.

[0023] Example 2 By varying the immersion time of the PFDTES top coating, a set of OPSZ / PFDTES composite anti-stick coatings were prepared. The specific operation is as follows: Steps (1) and (2): remain the same as in Example 1; (3) Preparation of PFDTES top coating: Select the optimized parameters, that is, weigh 6.48g of PFDTES, 22.95g of anhydrous ethanol, 2.55g of deionized water and 0.45g of concentrated ammonia, respectively, and stir at room temperature for 0.5 to complete the pre-hydrolysis of PFDTES and obtain a PFDTES hydrolysate with a concentration of 20%; (4) Preparation of PFDTES top coating: The above PFDTES hydrolysate was coated onto the surface of the OPSZ bottom coating by dip coating method. The dip coating time was changed to 0.5h, 1h, 1.5h, 2h and 4h, and a total of 5 samples were obtained.

[0024] (5) Curing of composite coating: Same as in Example 1.

[0025] Example 3 By varying the curing temperature of PFDTES, a group of OPSZ / PFDTES composite anti-stick coatings were prepared. The specific procedures are as follows: Steps (1) and (2): remain the same as in Example 1; Step (3): Same as in Example 2; Step (4): Same as in Example 1; Step (5) Composite coating curing: Place the coated stainless steel blade into an oven and heat it from room temperature to a certain temperature (set to 80℃, 120℃, 150℃ and 200℃ respectively) at a heating rate of 5℃ / min. Then cure it at this temperature for 2 hours and then cool it naturally to room temperature to obtain a set of OPSZ / PFDTES composite anti-stick coatings with different curing temperatures.

[0026] Example 4 By varying the curing time of PFDTES, a group of OPSZ / PFDTES composite anti-stick coatings were prepared. The specific procedures are as follows: Steps (1) and (2): remain the same as in Example 1; Step (3): Same as in Example 2; Step (4): Same as in Example 1; Step (5) Composite coating curing: Place the coated stainless steel blade into an oven and heat it from room temperature to 200℃ at a heating rate of 5℃ / min. Then cure it at this temperature for a certain time (set to 0.5h, 1h, 2h and 4h respectively), and then let it cool naturally to room temperature to obtain a set of OPSZ / PFDTES composite anti-stick coatings with different curing times.

[0027] Control group, Example 5 The specific preparation method for a pure OPSZ coating is as follows: Following the preparation method in Example 1, an OPSZ coating was prepared on the surface of a stainless steel blade according to the method and parameters described in steps 1 and 2 of Example 1. Then, the prepared OPSZ coating was placed in an oven and heated from room temperature to 200°C at a heating rate of 5°C / min. It was cured at 200°C for 2 hours and then naturally cooled to room temperature to obtain an OPSZ coating as a control group.

[0028] Performance testing Figure 1 The tape peel strength test results are for an uncoated stainless steel blade substrate, a control group pure OPSZ coating (OPSZ) prepared in Example 5, and an OPSZ / PFDTES composite anti-stick coating (OPSZ@PFDTES) prepared in Example 1 with an PFDTES addition amount of 6.48 g. Figure 1 It can be seen that the tape peel strength of the stainless steel blade as the substrate, the OPSZ coating in the control group Example 5, and the OPSZ / PFDTES composite anti-adhesive coating with 0.52g PFDTES added in Example 1 decreases in that order. Among them, the tape peel strength of the OPSZ / PFDTES composite coating (0.34 N / cm) is much lower than that of the stainless steel substrate and the OPSZ coating. This is mainly because the low surface energy fluorine segments from PFDTES are introduced into the composite coating, which reduces the surface energy of the composite coating and thus has a better anti-tape adhesion effect.

[0029] The adhesion level of the OPSZ / PFDTES composite anti-stick coating to the substrate was tested using the cross-cut adhesion test. Figure 2 The image shows the cross-cut adhesion test results of the OPSZ / PFDTES composite anti-stick coating prepared in Example 1 with an PFDTES addition amount of 6.48 g, where a represents the adhesion before tape peeling and b represents the adhesion after tape peeling. Figure 2 It can be seen that, compared to before the tape was peeled off ( Figure 2 (a) After the tape is peeled off ( Figure 2 No coating peeling was observed at the grid intersections in section b), indicating that the adhesion of the composite coating reached level 5B of the ASTM D3359 standard, confirming that the coating is firmly bonded to the substrate.

[0030] Figure 3 The XPS full spectrum and F 1s and Si 2p spectra of the OPSZ / PFDTES composite anti-stick coating prepared when the PFDTES addition amount was 6.48 g in Example 1 are shown, where a is the full spectrum, b is the F 1s spectrum, and c is the Si 2p spectrum. Figure 3 Figure a shows the characteristic peaks of elements such as F, Si, C, and O. Figure b shows the F 1s spectrum, with characteristic peaks at binding energies of 688.5 eV and 689.1 eV, corresponding to the CF covalent bonds in CF2 and CF3, respectively, confirming the presence of fluorine-containing segments. Figure c shows the Si 2p spectrum, with characteristic peaks at 102.6 eV (Si-O bond) and 103.3 eV (Si-C bond), mainly originating from the Si-O-Si network generated by the hydrolysis of the alkoxysilane ends of PFDTES, as well as the inherent Si-C bonds of the PFDTES molecule. XPS results indicate that the composite coating surface contains a relatively high amount of F, which is beneficial for reducing the surface energy of the coating and improving its anti-adhesion properties.

[0031] Figure 4 The water contact angle (a~d) and peel strength (e~h) of the OPSZ / PFDTES composite anti-stick coating prepared under different PFDTES concentrations in Example 1, different immersion times of the PFDTES top coating in Example 2, different curing temperatures during the curing of the composite coating in Example 3, and different curing times during the curing of the composite coating in Example 3 are given. Figure 4 The water contact angle (a–d) and peel strength (e–h) of OPSZ / PFDTES composite coatings prepared under different PFDTES concentrations (Example 1, a and e), immersion times (Example 2, b and f), curing temperatures (Example 3, c and g), and curing times (Example 4, d and h) are described. Figure 4 As shown in Figures a and e, as the concentration of PFDTES in the hydrolysate increases from 2% to 15%, the water contact angle of the prepared composite coating gradually increases, while the peel strength of the adhesive tape on the coating surface gradually decreases. This indicates that with the increase of fluorinated substances, the hydrophobicity of the coating gradually increases, and the anti-adhesion ability of the adhesive tape gradually increases. When the concentration of PFDTES continues to increase to 20% and above, the change in the contact angle is relatively small, indicating that the loading of fluorinated substances in the coating has reached saturation. With the increase of the PFDTES coating wetting time and curing time, the water contact angle and peel strength of the composite coating show similar patterns, that is, within a certain range, with the increase of wetting time and curing time, the water contact angle of the composite coating gradually increases, and the peel strength of the adhesive tape gradually decreases. However, when the value exceeds a certain value and continues to increase, the values ​​of the water contact angle and peel strength of the adhesive tape do not change much. The optimal preparation parameters for the OPSZ / PFDTES composite coating with high water contact angle (good superhydrophobic properties) and low peel strength (good anti-tape adhesion properties) in this experiment are: PFDTES concentration of 20%, PFDTES wetting time of 2h, composite coating curing temperature of 200℃, and curing time of 2h.

[0032] Figure 5 Comparison of mud contamination resistance (a, b) and ink graffiti resistance (c, d) tests on uncoated bare stainless steel blades and the OPSZ / PFDTES composite anti-stick coating prepared with 6.48 g of PFDTES in Example 1. Figure 5 Figures a and b show that the uncoated stainless steel blade surface is significantly contaminated with mud, while the OPSZ / PFDTES composite anti-stick coating surface has negligible residual mud, demonstrating excellent self-cleaning performance; from Figure 5As shown in figures c and d, compared to the uncoated control group, the writing on the composite coated surface is lighter after ink application, and no ink residue remains after wiping with a tissue. The results indicate that the OPSZ / PFDTES composite coating has good self-cleaning and anti-graffiti properties.

[0033] Figure 6 The curves show the changes in contact angle and peel strength of the OPSZ / PFDTES composite anti-stick coating prepared in Example 1 with an addition amount of 6.48 g, after 30 days of durability and 100 tape peel cycles. Figure 6 Figure a shows the changes in water contact angle and peel strength of the coating during a 30-day durability test. The initial water contact angle was 146.7°, which decreased to 144.6° after 30 days, with an attenuation rate of only 1.37% and a peel strength change rate of 4.2%. Figure b shows the changes in water contact angle and peel strength during a 100-cycle tape peel test. After 100 peel tests, the water contact angle attenuation rate was 1.1%, and the peel strength change rate was 5.7%. The results indicate that the coating has excellent durability and tape peel resistance.

[0034] In summary, this invention discloses a method for preparing an OPSZ / PFDTES composite anti-stick coating. An OPSZ underlayer and a PFDTES top layer are prepared sequentially via dip coating, followed by pre-curing and high-temperature curing to form the composite coating. This method achieves precise control over the superhydrophobic and anti-adhesion properties of the coating by adjusting key process parameters such as PFDTES concentration, dip coating time, curing temperature, and curing time. This solves the problems of unclear processes, weak adhesion between the coating and substrate, and poor durability that limit the practical application of traditional anti-stick coatings. The OPSZ / PFDTES composite anti-stick coating prepared by this invention forms a strong Me-O-Si chemical bond (Me-metal atom) between the OPSZ underlayer and the stainless steel substrate, and a stable Si-O-Si chemical bond is formed between the PFDTES top layer and the OPSZ underlayer through dehydration condensation between the Si-OH atoms generated by their respective hydrolysis. This results in a composite coating with both high bonding strength and excellent thermal stability. Simultaneously, the low surface energy fluorinated segments endow the coating with superhydrophobic properties and broad-spectrum anti-sticking performance, effectively repelling various contaminants such as water, oil, and mud. Furthermore, after 30 days of durability testing and 100 tape peel cycles, the coating showed minimal changes in water contact angle and peel strength. Therefore, its superhydrophobic and anti-adhesion properties did not significantly degrade, indicating that the OPSZ / PFDTES composite anti-adhesion coating prepared in this invention possesses good environmental adaptability and service life. This demonstrates that the composite anti-adhesion coating prepared in this invention can be widely applied to industrial cutting tools, pipe inner walls, and oily industrial equipment, reducing material adhesion, lowering frictional losses, and improving equipment cleanliness and service life. It provides a new coating preparation solution for anti-adhesion protection under complex working conditions, possessing significant industrialization value and application prospects.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing an OPSZ / PFDTES composite anti-stick coating, characterized in that, The method includes the following steps: (1) Preparation of OPSZ undercoat: After mixing organopolysilazane (OPSZ) with ethyl acetate evenly, it is coated onto the surface of the pretreated substrate by dip coating. After dip coating, it is taken out and pre-cured to obtain a pre-cured OPSZ undercoat. (2) Preparation of PFDTES prehydrolysate: 1H,1H,2H,2H-perfluorodecyltriethoxysilane, anhydrous ethanol, water and ammonia were mixed and stirred at room temperature to complete the prehydrolysate and obtain PFDTES hydrolysate; (3) Preparation of PFDTES top coating: The PFDTES hydrolysate prepared in step (2) is coated onto the surface of the OPSZ bottom coating prepared in step (1) by dip coating method to obtain the coated substrate; (4) Curing of composite coating: After the coated substrate described in step (3) is cured and cooled, the OPSZ / PFDTES composite anti-stick coating can be obtained.

2. The preparation method according to claim 1, characterized in that, In step (1), the pretreatment method of the substrate is as follows: the substrate is successively sanded with sandpaper, ultrasonically cleaned with acetone, rinsed with deionized water and anhydrous ethanol, and then dried to obtain the pretreated substrate.

3. The preparation method according to claim 2, characterized in that, The substrate is a material with hydroxyl groups on its surface; The sandpaper has a mesh size of 400, and the ultrasonic cleaning time with acetone is 10-30 minutes. The drying conditions are as follows: drying at 80°C for 10-30 minutes.

4. The preparation method according to claim 3, characterized in that, The substrate is a stainless steel blade or glass.

5. The preparation method according to claim 1, characterized in that, In step (1), the mass ratio of the organopolysilazane to ethyl acetate is 0.2~1:4, the dipping time is 0.5~4 h, the pre-curing temperature is 30~80℃, and the pre-curing time is 20~60 min.

6. The preparation method according to claim 1, characterized in that, In step (2), the mass ratio of 1H,1H,2H,2H-perfluorodecyltriethoxysilane, anhydrous ethanol, water and ammonia is 0.52 to 25.95: 22.95: 2.55: 0.

45.

7. The preparation method according to claim 1, characterized in that, In step (3), the dipping time is 0.5 to 4 hours.

8. The preparation method according to claim 1, characterized in that, In step (4), the curing temperature is 80 to 200°C and the curing time is 0.5 to 4 hours.

9. The OPSZ / PFDTES composite anti-stick coating prepared by the preparation method according to any one of claims 1 to 8.

10. The application of the OPSZ / PFDTES composite anti-stick coating of claim 9 in the preparation of superhydrophobic, anti-stick, or anti-fouling coating materials.

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