Modified polysiloxane coating for stainless steel pots and method of making same

Abstract

The application discloses a modified polysiloxane coating for a stainless steel pot and a preparation method thereof, and belongs to the technical field of polysiloxane coating. The modified polysiloxane coating comprises the following raw materials in parts by weight: 60-70 parts of hydroxyl polydimethylsiloxane, 20-30 parts of acrylate resin, 15-20 parts of ethanol, 25-30 parts of deionized water, 6-18 parts of modified nano-aluminum oxide, 2-4 parts of friction-reducing agent, 0.2-0.4 parts of benzophenone, and 1-3 parts of leveling agent. Polysiloxane is used as a main component, and the coating has excellent heat resistance; the friction-reducing agent can improve the wear resistance of the coating; the leveling agent improves the surface flatness of the coating; the modified nano-aluminum oxide has good compatibility with the polysiloxane, is not prone to agglomeration in the coating, has good dispersibility, and can greatly improve the heat resistance, hardness and easy-cleanability of the coating; the modified nano-aluminum oxide has stable performance and a long service life; and the application has important application value in the technical field of polysiloxane coating.

Description

Technical Field

[0001] The present invention belongs to the technical field of polysiloxane coatings, and in particular relates to a modified polysiloxane coating for a stainless steel pot and a preparation method thereof. Background Art

[0002] With the rapid development of the modern kitchenware manufacturing industry, stainless steel pots have become the mainstream choice for households and the catering industry due to their excellent mechanical properties, corrosion resistance and aesthetics. However, the inherent defects of stainless steel itself, such as high surface energy, uneven thermal conductivity, and easy local overheating leading to food charring, have long restricted the improvement of its user experience. Traditional solutions mainly rely on surface coating technology for modification, but the existing coating system still has significant limitations in comprehensive performance. Although polytetrafluoroethylene (PTFE) non-stick coatings have excellent hydrophobicity and oleophobicity, they are prone to decomposition and produce toxic substances in high temperature environments, and scratches and peeling usually appear in 3-6 months. Although ceramic coatings have improved temperature resistance, their brittleness and lack of toughness make them prone to microcracks under frequent thermal shocks, and their actual service life often does not exceed 12 months.

[0003] Polysiloxane (Polydimethylsiloxane, PDMS) is a class of polymer compounds composed of a silicon-oxygen bond (Si-O-Si) main chain and organic groups (such as methyl, ethyl or other functional side chains). It is widely used in the field of coatings due to its unique chemical structure and excellent performance. Due to the high bond energy of the silicon-oxygen bond, good heat resistance and good flexibility, it is an ideal material for stainless steel pot coatings. However, the insufficient hardness of polysiloxane leads to poor wear resistance. After long-term friction, the adhesion decreases, which can cause the coating to fall off. Existing studies have modified polysiloxane by introducing inorganic fillers such as nano-alumina and silicon carbide to improve the hardness of the coating, but the agglomeration of the filler leads to a decrease in the uniformity of the coating, and the interfacial compatibility problem causes stress concentration. These problems greatly limit the application of polysiloxane coatings as stainless steel pot coatings. Therefore, it is urgent to solve the above problems to meet the higher requirements of the field of polysiloxane coating technology. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a modified polysiloxane coating for stainless steel pots and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a modified polysiloxane coating for a stainless steel pot comprises the following steps:

[0007] A1. Mix hydroxy polydimethylsiloxane, acrylate resin, ethanol and deionized water, and then stir and disperse them at a speed of 200-400 rpm for 20-40 min. Then, add modified nano alumina, friction reducer, benzophenone and leveling agent in sequence, and continue to stir and disperse them at a speed of 800-1000 rpm for 20-40 min to obtain a modified polysiloxane coating;

[0008] A2. Spray the modified polysiloxane coating prepared in step A1 onto the inner surface of a stainless steel pot, UV-curing, and drying to obtain a modified polysiloxane coating for a stainless steel pot.

[0009] Furthermore, the raw materials are calculated in parts by weight as follows: 60-70 parts of hydroxypolydimethylsiloxane, 20-30 parts of acrylic resin, 15-20 parts of ethanol, 25-30 parts of deionized water, 6-18 parts of modified nano-alumina, 2-4 parts of friction reducer, 0.2-0.4 parts of benzophenone, and 1-3 parts of leveling agent.

[0010] Furthermore, the irradiation intensity of the UV curing is 60-80 mW / cm 2 ; Wavelength is 240nm or 320nm; Time is 30-60s.

[0011] Furthermore, the friction reducer is one of tungsten sulfide and molybdenum disulfide.

[0012] Furthermore, the leveling agent is one of castor oil and soybean oil.

[0013] Polysiloxane is used as the main component of the coating, which gives it excellent heat resistance; the addition of a friction reducer can reduce friction and improve the wear resistance of the coating; the addition of a leveling agent improves the surface flatness of the coating; the curing method adopts UV curing, which has a fast curing time.

[0014] Furthermore, the modified nano-alumina is prepared by the following steps:

[0015] Step 1: γ-aminopropyltriethoxysilane (silane coupling agent KH-550) is mixed with an ethanol aqueous solution (ethanol / water volume ratio of 4:1), and an acetic acid solution (mass fraction 8%) is added to adjust the pH of the system to 4-5. The mixture is stirred at room temperature for 30 minutes to fully hydrolyze the γ-aminopropyltriethoxysilane. Nano-alumina is then added, and the mixture is stirred in a constant temperature water bath at 70°C for 4 hours. After the reaction is complete, the mixture is centrifuged, washed with anhydrous ethanol several times, vacuum dried, and ground to obtain silane-modified nano-alumina.

[0016] Nano-alumina is modified by γ-aminopropyltriethoxysilane to introduce amino groups for subsequent reactions, thereby obtaining silane-modified nano-alumina.

[0017] Step 2: Diethylenetriamine and N,N-dimethylformamide were added to a three-necked round-bottom flask equipped with a thermometer, a magnetic stirring system, and a spherical condenser. Formaldehyde solution (mass fraction 13%) was added dropwise under an ice-water bath and stirred continuously until the addition was complete. 3,4,5-trifluorophenol was then added and the temperature was increased until the temperature of the reaction system reached 68°C. The reaction was refluxed for 6 hours. After the reaction was completed, the mixture was cooled to room temperature, and some of the solvent was removed by rotary evaporation. The mixture was purified by column chromatography using a benzene-ethyl acetate (2:1, v / v) elution system. The residual eluent was finally removed by reduced pressure distillation to obtain an intermediate product 1.

[0018] Diethylenetriamine and 3,4,5-trifluorophenol undergo a Mannich condensation reaction, and the molar ratio of the two is adjusted to close to 1:2 (3,4,5-trifluorophenol is slightly excessive) to ensure that two amino groups on the diethylenetriamine participate in the reaction, thereby generating intermediate 1. The specific reaction process is as follows:

[0019]

[0020] Step 3, the intermediate product 1, triethylamine, 5-bromovaleric acid and N,N-dimethylformamide were added to a three-necked flask equipped with a magnetic stirrer, a condenser and a thermometer, nitrogen was introduced as a protective gas, the reaction temperature was set to 75 ° C, and the reaction was stirred for 5 hours. After the reaction was completed, part of the solvent was removed by distillation under reduced pressure, and then column chromatography was performed using a benzene-ethyl acetate (3:1, v / v) elution system. Finally, the residual eluent was removed by distillation under reduced pressure to obtain the intermediate product 2;

[0021] Intermediate product 1 undergoes a nucleophilic substitution reaction with 5-bromovaleric acid. Triethylamine acts as an acid-binding agent to remove hydrogen bromide generated by the reaction and catalyze the reaction to produce intermediate product 2. The structure of intermediate product 2 is shown below:

[0022]

[0023] Step 4: In a three-necked flask, the silane-modified nano-alumina and N,N-dimethylformamide were mixed and ultrasonicated for 30 minutes to uniformly disperse the silane-modified nano-alumina. Then, the intermediate product 2 and dicyclohexylcarbodiimide (DCC) were added and magnetically stirred for 3 hours. The mixture was placed in a 60°C water bath and ultrasonicated for 2 hours. The water bath was then removed and magnetically stirred at room temperature for 8 hours. The mixture was filtered, washed with anhydrous ethanol several times, dried, and ground to obtain modified nano-alumina.

[0024] Under the catalysis of dicyclohexylcarbodiimide, the silane-modified nano-alumina reacts with the intermediate product 2 to produce modified nano-alumina.

[0025] Furthermore, in step 1, the ratio of the amount of nano-alumina, γ-aminopropyltriethoxysilane, and ethanol aqueous solution is 1g:5.7g:50mL.

[0026] Furthermore, in step 2, the ratio of diethylenetriamine, N,N-dimethylformamide, formaldehyde solution, and 3,4,5-trifluorophenol is 10.3 g:100 mL:15 mL:31.3 g.

[0027] Furthermore, in step 3, the ratio of the amount of intermediate product 1, triethylamine, 5-bromovaleric acid, and N,N-dimethylformamide is 44.7 g:13.8 g:15 mL:150 mL.

[0028] Furthermore, in step 4, the ratio of the amount of silane-modified nano-alumina, N,N-dimethylformamide, intermediate 2, and dicyclohexylcarbodiimide is 1 g:100 mL:15.6 g:6.3 g.

[0029] Nano-alumina has excellent mechanical strength and heat stability. The nano-alumina is initially modified with the silane coupling agent KH-550 and then modified with the intermediate product 2 to obtain the modified nano-alumina. The modified nano-alumina can significantly improve the compatibility of the nano-alumina with polysiloxane, allowing the nano-alumina to be evenly dispersed in the coating, better exerting its performance, and greatly improving the hardness and heat resistance of the substrate. In addition, the organic molecular chain on the modified nano-alumina also contains a benzoxazine structure, which contains a benzene ring and an oxazine ring. The conjugated structure of the two gives the molecular chain high rigidity, restricts chain segment movement, reduces thermal vibration energy absorption at high temperatures, and further improves the heat resistance of the substrate. In addition, the introduction of C-F bonds, which have higher bond energy and better stability, can shield and protect the carbon chain, reduce the surface free energy of the substrate, and not only improve the heat resistance of the substrate, but also enhance the hydrophobicity and oleophobicity of the substrate, making it easier to clean. Finally, the connection between the organic small molecules and the inorganic material can improve the migration resistance of the organic small molecules and extend their service life.

[0030] Beneficial effects of the present invention:

[0031] 1. The coating prepared by the present invention uses polysiloxane as the main component, which gives the coating excellent heat resistance;

[0032] 2. Adding friction reducer can reduce friction and improve the wear resistance of the coating;

[0033] 3. Add leveling agent to improve the surface smoothness of the coating;

[0034] 4. Modified nano-alumina is obtained through a series of reactions. Compared with ordinary nano-alumina, it has better compatibility with polysiloxane, is not easy to agglomerate in the coating, has good dispersibility, can greatly improve the heat resistance, hardness and easy cleaning of the coating; and has stable performance and long service life;

[0035] Therefore, the coating prepared by the present invention has high hardness, is easy to clean, and also has stable and efficient heat resistance and wear resistance, and has important application value in the field of polysiloxane coating technology. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1

[0038] Preparation of modified nano-alumina:

[0039] Step 1: 5.7 g of γ-aminopropyltriethoxysilane was mixed with 50 mL of an ethanol-water solution (ethanol / water volume ratio of 4:1), and an acetic acid solution (mass fraction 8%) was added to adjust the pH of the system to 5. The mixture was stirred at room temperature for 30 minutes to fully hydrolyze the γ-aminopropyltriethoxysilane. 1 g of nano-alumina was then added, and the mixture was stirred in a constant temperature water bath at 70°C for 4 hours. After the reaction was complete, the mixture was centrifuged, washed with anhydrous ethanol several times, vacuum dried, and ground to obtain silane-modified nano-alumina.

[0040] Step 2: 10.3 g of diethylenetriamine and 100 mL of N,N-dimethylformamide were added to a three-necked round-bottom flask equipped with a thermometer, a magnetic stirring system, and a spherical condenser. Under an ice-water bath, 15 mL of formaldehyde solution (mass fraction 13%) was added dropwise and stirred continuously until the addition was complete. Then, 31.3 g of 3,4,5-trifluorophenol was added and the temperature was increased until the temperature of the reaction system reached 68 ° C. The reaction was refluxed for 6 hours. After the reaction was completed, the mixture was cooled to room temperature, and some of the solvent was removed by rotary evaporation. The mixture was purified by column chromatography using a benzene-ethyl acetate (2:1, v / v) elution system. Finally, the residual eluent was removed by reduced pressure distillation to obtain an intermediate product 1.

[0041] Step 3, 44.7 g of intermediate product 1, 13.8 g of triethylamine, 15 mL of 5-bromovaleric acid and 150 mL of N, N-dimethylformamide were added to a three-necked flask equipped with a magnetic stirrer, a condenser and a thermometer, nitrogen was introduced as a protective gas, the reaction temperature was set to 75 ° C, and the reaction was stirred for 5 hours. After the reaction was completed, part of the solvent was removed by distillation under reduced pressure, and then column chromatography was performed using a benzene-ethyl acetate (3:1, v / v) elution system. Finally, the residual eluent was removed by distillation under reduced pressure to obtain intermediate product 2;

[0042] Step 4. In a three-necked flask, mix 1 g of silane-modified nano-alumina and 100 mL of N,N-dimethylformamide, and ultrasonically treat for 30 minutes to uniformly disperse the silane-modified nano-alumina. Then add 15.6 g of intermediate product 2 and 6.3 g of dicyclohexylcarbodiimide, and magnetically stir for 3 hours. Place in a 60°C water bath and ultrasonicate for 2 hours. Then remove the water bath and magnetically stir at room temperature for 8 hours. Filter, wash with anhydrous ethanol several times, dry, and grind to obtain modified nano-alumina.

[0043] Example 2

[0044] Preparation of modified nano-alumina:

[0045] Step 1: 11.4 g of γ-aminopropyltriethoxysilane was mixed with 100 mL of an ethanol-water solution (ethanol / water volume ratio of 4:1), and an acetic acid solution (mass fraction 8%) was added to adjust the pH of the system to 4. The mixture was stirred at room temperature for 30 minutes to fully hydrolyze the γ-aminopropyltriethoxysilane. 2 g of nano-alumina was then added, and the mixture was stirred in a constant temperature water bath at 70° C. for 4 hours. After the reaction was complete, the mixture was centrifuged, washed with anhydrous ethanol several times, vacuum dried, and ground to obtain silane-modified nano-alumina.

[0046] Step 2: 20.6 g of diethylenetriamine and 200 mL of N,N-dimethylformamide were added to a three-necked round-bottom flask equipped with a thermometer, a magnetic stirring system, and a spherical condenser. Under an ice-water bath, 30 mL of formaldehyde solution (mass fraction 13%) was added dropwise and stirred continuously until the addition was complete. Then, 62.6 g of 3,4,5-trifluorophenol was added and the temperature was increased until the temperature of the reaction system reached 68 ° C. The reaction was refluxed for 6 hours. After the reaction was completed, the mixture was cooled to room temperature, and some of the solvent was removed by rotary evaporation. The mixture was purified by column chromatography using a benzene-ethyl acetate (2:1, v / v) elution system. Finally, the residual eluent was removed by reduced pressure distillation to obtain an intermediate product 1.

[0047] Step 3, 89.4 g of intermediate product 1, 27.6 g of triethylamine, 30 mL of 5-bromovaleric acid and 300 mL of N, N-dimethylformamide were added to a three-necked flask equipped with a magnetic stirrer, a condenser and a thermometer, nitrogen was introduced as a protective gas, the reaction temperature was set to 75 ° C, and the reaction was stirred for 5 hours. After the reaction was completed, part of the solvent was distilled off under reduced pressure, and then column chromatography was performed using a benzene-ethyl acetate (3:1, v / v) elution system. Purification was finally performed by distillation under reduced pressure to remove the residual eluent to obtain intermediate product 2;

[0048] Step 4. In a three-necked flask, mix 2 g of silane-modified nano-alumina and 200 mL of N,N-dimethylformamide, and ultrasonically treat for 30 min to uniformly disperse the silane-modified nano-alumina. Then add 31.2 g of intermediate product 2 and 12.6 g of dicyclohexylcarbodiimide, and magnetically stir for 3 h. Place in a 60°C water bath and ultrasonicate for 2 h. Then remove the water bath and magnetically stir at room temperature for 8 h. Filter, wash with anhydrous ethanol several times, dry, and grind to obtain modified nano-alumina.

[0049] Example 3

[0050] 60 g of hydroxypolydimethylsiloxane, 20 g of acrylate resin, 15 g of ethanol, and 25 g of deionized water were mixed, and then stirred and dispersed at 200 rpm for 20 min. Then, 6 g of the modified nano-alumina prepared in Example 1, 2 g of tungsten sulfide, 0.2 g of benzophenone, and 1 g of castor oil were added in sequence, and stirring and dispersion at 800 rpm was continued for 20 min to obtain a modified polysiloxane coating.

[0051] Example 4

[0052] 65 g of hydroxypolydimethylsiloxane, 25 g of acrylate resin, 20 g of ethanol and 30 g of deionized water were mixed, and then stirred and dispersed at 300 rpm for 30 min. Then, 12 g of modified nano-alumina prepared in Example 2, 3 g of molybdenum disulfide, 0.3 g of benzophenone and 2 g of soybean oil were added in sequence, and stirring and dispersion at 900 rpm was continued for 30 min to obtain a modified polysiloxane coating.

[0053] Example 5

[0054] A1. 70 g of hydroxypolydimethylsiloxane, 30 g of acrylate resin, 20 g of ethanol and 30 g of deionized water were mixed, and then stirred and dispersed at 400 rpm for 40 min. Then, 18 g of modified nano-alumina prepared in Example 2, 4 g of molybdenum disulfide, 0.4 g of benzophenone and 3 g of soybean oil were added in sequence, and stirring and dispersing at 1000 rpm for 40 min was continued to obtain a modified polysiloxane coating.

[0055] Example 6

[0056] A1. 70 g of hydroxypolydimethylsiloxane, 30 g of acrylate resin, 20 g of ethanol and 30 g of deionized water were mixed, and then stirred and dispersed at 400 rpm for 40 min. Then, 18 g of the modified nano-alumina prepared in Example 2, 4 g of molybdenum disulfide, 0.4 g of benzophenone and 3 g of soybean oil were added in sequence, and stirring and dispersing at 1000 rpm for 40 min was continued to obtain a modified polysiloxane coating;

[0057] A2, spray the modified polysiloxane coating prepared in step A1 on the inner surface of the stainless steel pot, and irradiate with an intensity of 80mW / cm 2 , wavelength is 320nm, UV curing time is 60s, and drying is performed to obtain a modified polysiloxane coating for a stainless steel pot.

[0058] Comparative Example 1

[0059] Ordinary nano-alumina of the same mass was used to replace the modified nano-alumina in Example 5, and the remaining steps were the same as in Example 5 to prepare the coating.

[0060] Comparative Example 2

[0061] Commercially available silicone coatings were used.

[0062] The following performance tests were performed on Examples 3, 4, and 5 and Comparative Examples 1 and 2 according to different test standards:

[0063] Adhesion was determined using GB / T 9286-2021;

[0064] Pencil hardness was measured using GB / T 6739-1996:

[0065] GB / T 32095.2-2015 was used to determine the flat wear resistance;

[0066] Place the sample at 400℃ for 12 hours and measure the adhesion (test standard GB / T9286-1998);

[0067] The measured results are shown in the following table:

[0068]

[0069] As can be seen from the above table, the hardness, heat resistance and wear resistance of the polysiloxane coating prepared in the embodiment of the present invention are higher than those of the comparative example. Using it in a stainless steel pot can improve the corresponding performance. Therefore, the present invention has important application value in the field of polysiloxane coating technology.

[0070] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a modified polysiloxane coating for a stainless steel pot, characterized in that: The following steps are involved: A1. Mix hydroxy polydimethylsiloxane, acrylate resin, ethanol and deionized water, and then stir and disperse them at a speed of 200-400 rpm for 20-40 min. Then, add modified nano alumina, friction reducer, benzophenone and leveling agent in sequence, and continue to stir and disperse them at a speed of 800-1000 rpm for 20-40 min to obtain a modified polysiloxane coating; A2. Spraying the modified polysiloxane coating prepared in step A1 onto the inner surface of a stainless steel pot, UV curing, and drying to obtain a modified polysiloxane coating for a stainless steel pot; The raw materials are calculated in parts by weight as follows: 60-70 parts of hydroxy polydimethylsiloxane, 20-30 parts of acrylate resin, 15-20 parts of ethanol, 25-30 parts of deionized water, 6-18 parts of modified nano-alumina, 2-4 parts of friction reducer, 0.2-0.4 parts of benzophenone, and 1-3 parts of leveling agent; Wherein, the modified nano-alumina is prepared by the following steps: Step 1: γ-aminopropyltriethoxysilane is mixed with an ethanol aqueous solution, the pH of the system is adjusted to 4-5, and the mixture is stirred at room temperature for 30 minutes; nano-alumina is then added, and the mixture is stirred at 70°C for 4 hours. After the reaction is complete, the mixture is centrifuged, washed, dried, and ground to obtain silane-modified nano-alumina; Step 2: Diethylenetriamine and N,N-dimethylformamide were added to a flask, and formaldehyde solution was added dropwise under ice-water bath conditions with continuous stirring. After the addition was complete, 3,4,5-trifluorophenol was added, and the temperature was raised. When the temperature reached 68°C, the reaction was refluxed for 6 hours. After the reaction was complete, the mixture was cooled to room temperature, rotary evaporated, purified by column chromatography, and distilled under reduced pressure to obtain intermediate 1. Step 3: Add the intermediate product 1, triethylamine, 5-bromovaleric acid and N,N-dimethylformamide into a flask, introduce nitrogen, set the reaction temperature to 75°C, stir and react for 5 hours, and after the reaction is completed, distill under reduced pressure, purify by column chromatography, and distill under reduced pressure to obtain the intermediate product 2; Step 4: Mix the silane-modified nano-alumina and N,N-dimethylformamide, ultrasonically treat for 30 minutes, then add the intermediate product 2 and dicyclohexylcarbodiimide, magnetically stir for 3 hours, place in a 60°C water bath and ultrasonicate for 2 hours, stir at room temperature for 8 hours, filter, wash, dry, and grind to obtain modified nano-alumina.

2. The method for preparing a modified polysiloxane coating for a stainless steel pot according to claim 1, characterized in that: In step 1, the ratio of nano-alumina, γ-aminopropyltriethoxysilane, and ethanol aqueous solution is 1 g:5.7 g:50 mL.

3. The method for preparing a modified polysiloxane coating for a stainless steel pot according to claim 1, characterized in that: In step 2, the ratio of diethylenetriamine, N,N-dimethylformamide, formaldehyde solution, and 3,4,5-trifluorophenol is 10.3 g:100 mL:15 mL:31.3 g.

4. The method for preparing a modified polysiloxane coating for a stainless steel pot according to claim 1, wherein: In step 3, the ratio of the amount of intermediate product 1, triethylamine, 5-bromovaleric acid, and N,N-dimethylformamide is 44.7 g:13.8 g:15 mL:150 mL.

5. The method for preparing a modified polysiloxane coating for a stainless steel pot according to claim 1, characterized in that: In step 4, the ratio of the amount of silane-modified nano-alumina, N,N-dimethylformamide, intermediate 2, and dicyclohexylcarbodiimide is 1 g:100 mL:15.6 g:6.3 g.

6. The method for preparing a modified polysiloxane coating for a stainless steel pot according to claim 1, characterized in that: The friction reducer is one of tungsten sulfide and molybdenum disulfide.

7. The method for preparing a modified polysiloxane coating for a stainless steel pot according to claim 1, characterized in that: The leveling agent is one of castor oil and soybean oil.

8. A modified polysiloxane coating for a stainless steel pot, characterized in that: Prepared according to the method according to any one of claims 1 to 7.

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