Composition for super-slippery coating, super-slippery coating, super-slippery coating assembly, and preparation method and application thereof

Abstract

This application discloses compositions for superlubricating coatings, superlubricating coatings, superlubricating coating components, preparation methods, and applications thereof. The compositions for superlubricating coatings include: 18 to 27 parts by weight of silica sol, 20 to 30 parts by weight of siloxane, 1 to 5 parts by weight of methoxy-terminated polysilane, and 0.1 to 0.5 parts by weight of an acidic catalyst. The compositions for superlubricating coatings of this application can collectively form a liquid-like superlubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the superlubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively improving the lubrication, non-stick, and hydrophobic properties of the superlubricating coating.

Description

Technical Field

[0001] This application belongs to the field of household appliance technology, specifically relating to a composition for super-slippery coating, super-slippery coating, super-slippery coating assembly, preparation method and application thereof. Background Technology

[0002] As a novel type of antifouling surface, superlubricated insulated surfaces (SLIPS) replace the air in the micro-nano structure of superliquid surfaces with lubricating oil, resulting in a smooth, continuous, and chemically homogeneous liquid-liquid surface. This superlubricated surface exhibits an extremely small sliding angle, excellent liquid repellency, anti-adhesion, and pressure stability, showing broad application prospects in antifouling, anti-adhesion, drag reduction, anti-icing, and corrosion prevention. However, the lubricating oil stored in SLIPS surfaces is mostly adsorbed through physical processes, resulting in relatively low stability. Under the influence of liquid scouring and external friction, the lubricating oil is easily lost and depleted, thus limiting its practical application.

[0003] Existing technologies also include biomimetic superlubricating coatings with a double-layer structure. This coating consists of a three-dimensional porous oil reservoir layer as the bottom layer and a layered superlubricating layer as the top layer. The three-dimensional porous oil reservoir layer contains uniformly distributed three-dimensional micron-sized pores with nanopores distributed on the pore walls, exhibiting strong oil storage but weak oil retention capacity. However, the silicone oil in this coating is stored within the coating through physical adsorption, which cannot fundamentally solve the problem of silicone oil loss.

[0004] Other existing super-slippery surfaces all suffer from the problem that their hydrophobic structure is easily damaged, resulting in a loss of anti-fouling properties. Summary of the Invention

[0005] This application aims to at least partially address one of the technical problems in the related art. Therefore, the purpose of this application is to provide a composition for a superlubricating coating, a superlubricating coating, a superlubricating coating assembly, a method for preparing the same, and its applications. The composition for a superlubricating coating of this application can collectively form a liquid-like superlubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the superlubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively improving the lubrication performance, non-stick properties, and hydrophobic properties of the superlubricating coating.

[0006] In one aspect of this application, a composition for a super-lubricating coating is provided. According to an embodiment of this application, the composition for a super-lubricating coating comprises: 18 to 27 parts by weight of silica sol, 20 to 30 parts by weight of siloxane, 1 to 5 parts by weight of methoxy-terminated polysilane, and 0.1 to 0.5 parts by weight of an acidic catalyst.

[0007] The composition for a super-lubricating coating according to embodiments of this application includes a silica sol, a siloxane, a methoxy-terminated polysilane, and an acidic catalyst. The silica sol is the main film-forming substance, and the siloxane is the auxiliary film-forming substance. Specifically, the siloxane and the methoxy-terminated polysilane undergo hydrolysis under the action of the acidic catalyst. The hydrolyzed siloxane and silica sol react to form a network structure of polysiloxane segments. The hydrolyzed methoxy-terminated polysilane (i.e., flexible silane molecular chains) is grafted into the polysiloxane segments to form a liquid-like super-lubricating coating with adjustable thickness. The network structure of polysiloxane segments is solid, allowing it to adhere firmly to the substrate surface, while the flexible silane molecular chains are liquid. Therefore, they can jointly form a liquid-like super-lubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively improving the lubrication performance, non-stick properties, and hydrophobic properties of the super-lubricating coating. Meanwhile, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, and the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating are further effectively enhanced.

[0008] In addition, the composition for super-slip coating according to the above embodiments of this application may also have the following additional technical features:

[0009] In some embodiments of this application, the silica sol comprises 50 wt% to 70 wt% water and 30 wt% to 50 wt% silica.

[0010] In some embodiments of this application, the silicon dioxide has a particle size at the nanometer level.

[0011] In some embodiments of this application, the average particle size of the silicon dioxide is 10 nm to 100 nm.

[0012] In some embodiments of this application, the siloxane includes at least one selected from methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, glycidoxypropyltrimethoxysilane, glycidoxypropyltriethoxysilane, chloropropyltrimethoxysilane, and chloropropyltriethoxysilane.

[0013] In some embodiments of this application, the molecular weight of the methoxy-terminated polysilane is 1,000 to 100,000.

[0014] In some embodiments of this application, the acidic catalyst comprises an organic acid.

[0015] In some embodiments of this application, the acidic catalyst includes at least one of formic acid, acetic acid, and p-toluenesulfonic acid.

[0016] In some embodiments of this application, the composition for the super-slip coating further includes: 1 to 10 parts by weight of a co-solvent.

[0017] In some embodiments of this application, the cosolvent includes at least one of propylene glycol methyl ether and isopropanol.

[0018] In some embodiments of this application, the composition for the super-slip coating further includes at least one of pigment, pigment dispersant, filler, film-forming aid, anti-cold agent, defoamer, leveling agent, rheology modifier, preservative, ultraviolet absorber, antioxidant, matting agent, lubricant, and vulcanizing agent.

[0019] In a second aspect, this application proposes a super-lubricating coating. According to embodiments of this application, the super-lubricating coating comprises a modified polysiloxane, which includes polysiloxane segments and flexible silane molecular segments grafted onto the polysiloxane segments. Thus, the network-structured polysiloxane segments are solid, allowing them to firmly adhere to the substrate surface, while the flexible silane molecular segments are liquid. Therefore, the grafting of flexible silane molecular segments onto the polysiloxane segments forms a liquid-like super-lubricating coating with adjustable thickness, effectively improving the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively enhancing its lubrication, non-stick, and hydrophobic properties. Simultaneously, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments are further improved, further effectively enhancing the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating.

[0020] In addition, the super-slippery coating according to the above embodiments of this application may also have the following additional technical features:

[0021] In some embodiments of this application, the modified polysiloxane comprises at least one compound of Formula I:

[0022]

[0023] R1, R2, R3 and R4 are selected from one of methyl, ethyl, aminopropyl, mercaptopropyl, chloropropyl, glycidyl ether oxypropyl, oxygen, vinyl, and amide groups, respectively, and n ranges from 8 to 80.

[0024] In a third aspect, this application proposes a super-lubricating coating assembly. According to an embodiment of this application, the super-lubricating coating assembly includes: a substrate layer and a super-lubricating coating as described in the second aspect, the super-lubricating coating being disposed on at least a portion of the surface of the substrate layer. Thus, the super-lubricating coating includes a modified polysiloxane, which comprises polysiloxane segments and flexible silane molecular segments grafted onto the polysiloxane segments. The network-structured polysiloxane segments are solid and can firmly adhere to the surface of the substrate layer, while the flexible silane molecular segments are liquid. Therefore, the grafting of flexible silane molecular segments onto the polysiloxane segments can form a liquid-like super-lubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively improving the lubrication performance, non-stick properties, and hydrophobic properties of the super-lubricating coating. Meanwhile, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, and the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating are further effectively enhanced.

[0025] In addition, the super-slippery coating assembly according to the above embodiments of this application may also have the following additional technical features:

[0026] In some embodiments of this application, the thickness of the super-slippery coating is 5 μm to 50 μm.

[0027] In some embodiments of this application, the substrate layer includes at least one of a ceramic substrate layer and a metal substrate layer.

[0028] In a fourth aspect of this application, a method for preparing the super-lubricated coating assembly of the above embodiments is provided. According to an embodiment of this application, the method includes: mixing a siloxane, a methoxy-terminated polysilane, an acidic catalyst, and an optional co-solvent, and stirring to obtain a first dispersion; mixing the first dispersion with a silica sol and stirring to obtain a second dispersion; coating the second dispersion onto at least a portion of the surface of a substrate, and drying to form a super-lubricated coating, thereby obtaining the super-lubricated coating assembly.

[0029] According to the method for preparing a superlubricating coating component according to embodiments of this application, the method can effectively hydrolyze siloxanes and methoxy-terminated polysilanes under the action of an acidic catalyst. The hydrolyzed siloxanes and silica sol react to form a network structure of polysiloxane segments. The hydrolyzed methoxy-terminated polysilanes (i.e., flexible silane molecular chains) are grafted into the polysiloxane segments to form a liquid-like superlubricating coating with adjustable thickness. The network structure of polysiloxane segments is solid, allowing it to adhere firmly to the substrate surface, while the flexible silane molecular chains are liquid. Therefore, they can jointly form a liquid-like superlubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the superlubricating coating in turbulent, mechanically worn, and corrosive environments, and effectively improving the lubrication, non-stick, and hydrophobic properties of the superlubricating coating. Meanwhile, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, and the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating are further effectively enhanced.

[0030] In a fifth aspect, this application provides a cooking utensil. According to embodiments of this application, the cooking utensil includes the super-slip coating component of the above embodiments or the super-slip coating component obtained by the method of the above embodiments. Thus, the cooking utensil possesses excellent and durable stable lubrication properties, non-stick properties, and hydrophobic properties.

[0031] In a sixth aspect, this application discloses a cooking apparatus. According to an embodiment of this application, the cooking apparatus has the cooking utensils described above. This cooking apparatus possesses all the features and advantages of the aforementioned cooking utensils, which will not be repeated here. In general, this cooking apparatus exhibits excellent and durable lubrication properties, non-stick properties, and liquid-repellent properties.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a cross-sectional schematic diagram of a super-slippery coating assembly according to some embodiments of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a super-slippery coating assembly according to some embodiments of this application.

[0036] Figure label:

[0037] 100 - Substrate layer, 200 - Super-slip coating. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0039] This application was filed by the inventor based on the following questions:

[0040] In related technologies, one end of the flexible macromolecular chain of a liquid lubricant (such as perfluoropolyether or poly(dimethylsiloxane)) is directly grafted onto the substrate surface to form a liquid lubricant-like coating to repel liquids. Because of their covalent attachment to the surface, the molecular structure of these lubricants cannot be replaced by the contacting liquid. However, the liquid lubricant can only form a single-layer liquid lubricant-like coating on the substrate surface, and the thickness of this single layer is on the nanometer scale. Therefore, even after slight wear, it will still lose its anti-fouling properties due to the destruction of its hydrophobic structure.

[0041] In view of this, in one aspect of this application, a composition for a super-lubricating coating is provided. According to embodiments of this application, the composition for a super-lubricating coating comprises: 18 to 27 parts by weight of silica sol, 20 to 30 parts by weight of siloxane, 1 to 5 parts by weight of methoxy-terminated polysilane, and 0.1 to 0.5 parts by weight of an acidic catalyst. The beneficial effects of the composition for a super-lubricating coating proposed in this application are described in detail below:

[0042] This application provides a novel composition for a superlubricating coating, comprising silica sol, siloxane, methoxy-terminated polysilane, and an acidic catalyst. Silica sol is the primary film-forming substance, and siloxane is the secondary film-forming substance. Specifically, the siloxane and methoxy-terminated polysilane undergo hydrolysis under the action of the acidic catalyst. The hydrolyzed siloxane reacts with the silica sol to form a network structure of polysiloxane segments. The hydrolyzed methoxy-terminated polysilane (i.e., flexible silane molecular chains) is grafted onto the polysiloxane segments to form a liquid-like superlubricating coating with adjustable thickness. The network structure of polysiloxane segments is solid, allowing it to adhere firmly to the substrate surface, while the flexible silane molecular chains are liquid. Therefore, they together form a liquid-like superlubricating coating with adjustable thickness, effectively improving the durability and mechanical stability of the superlubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively enhancing the lubrication, non-stick, and hydrophobic properties of the superlubricating coating. Meanwhile, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, and the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating are further effectively enhanced.

[0043] According to some specific embodiments of this application, the aforementioned silica sol comprises 50 wt% to 70 wt% water and 30 wt% to 50 wt% silica. The water in the silica sol can effectively promote the hydrolysis of siloxanes and methoxy-terminated polysilanes under the action of an acidic catalyst, and the silica can react with the hydrolyzed siloxanes to form polysiloxane segments with a network structure.

[0044] According to some specific embodiments of this application, the silica particles in the silica sol are at the nanometer level. The silica sol mainly serves to enhance the mechanical strength of the coating, and the super-slippery coating formed by silica with the above-mentioned particle size range exhibits superior durability, corrosion resistance, and mechanical properties. The inventors have found that if the silica particle size in the silica sol is too small, it leads to poor storage stability and easy flocculation; if the particle size is too large, it leads to poor coating density, resulting in poor coating durability, corrosion resistance, and mechanical properties. As some preferred embodiments, the average particle size of the silica in the silica sol is 10nm to 100nm, for example, it can be 10nm, 20nm, 40nm, 50nm, 60nm, 80nm, 100nm, etc.

[0045] In the embodiments of this application, the specific types of siloxanes are not particularly limited, and those skilled in the art can select them according to actual needs. As some preferred embodiments, the siloxanes include at least one of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, glycidoxypropyltrimethoxysilane, glycidoxypropyltriethoxysilane, chloropropyltrimethoxysilane, and chloropropyltriethoxysilane.

[0046] According to some specific embodiments of this application, the molecular weight of the methoxy-terminated polysilane is 1000 to 100000. Therefore, the super-lubricating coating formed by methoxy-terminated polysilanes within this molecular weight range exhibits superior lubrication, non-stick properties, and hydrophobic properties. The inventors have discovered that if the molecular weight of the methoxy-terminated polysilane is too small, the resulting super-lubricating coating will have poor hydrophobicity; if the molecular weight of the methoxy-terminated polysilane is too large, the polymer chains enriched on the surface of the super-lubricating coating will become entangled, thereby reducing its mobility. During the curing process, random wrinkles at the nanoscale will appear due to internal stress, and the presence of these wrinkles will affect the sliding effect of the super-lubricating coating.

[0047] According to further embodiments of this application, the acidic catalyst includes an organic acid that can effectively catalyze the hydrolytic polycondensation of alkoxy groups in siloxanes. As some preferred embodiments, the acidic catalyst includes at least one of formic acid, acetic acid, and p-toluenesulfonic acid.

[0048] According to some specific embodiments of this application, the composition for super-slip coating described above may further include: 1 to 10 parts by weight of a co-solvent, which can effectively dissolve methoxy-terminated polysilanes and siloxanes, and at the same time, the co-solvent also plays an auxiliary role in film formation.

[0049] In the embodiments of this application, the specific types of cosolvents are not particularly limited, and those skilled in the art can select them according to actual needs. As some preferred embodiments, the cosolvents include at least one of propylene glycol methyl ether and isopropanol.

[0050] According to some specific embodiments of this application, the above-mentioned composition for super-slip coating may further include at least one of the following: pigment (e.g., titanium dioxide), pigment dispersant, filler, film-forming aid, anti-cold agent, defoamer, leveling agent, rheology modifier, preservative, ultraviolet absorber, antioxidant, matting agent, lubricant, and vulcanizing agent. Those skilled in the art can add these additives according to actual needs. For example, if a colored super-slip coating is desired, appropriate pigments and pigment dispersants can be added to the composition; if there is a lot of foam during the formation of the super-slip coating, an antifoamer can be added to the composition; if there is little foam, it is not necessary to add one; if a super-slip coating needs to be formed in a cold environment, an anti-cold agent can be added to the composition. In summary, those skilled in the art can add at least one of the above-mentioned additives according to actual needs. The amounts of the above-mentioned pigments, pigment dispersants, fillers, film-forming aids, anti-cold agents, defoamers, leveling agents, rheology modifiers, preservatives, ultraviolet absorbers, antioxidants, matting agents, lubricants, and vulcanizing agents are not particularly limited and can be added according to actual needs. The specific types of pigments, pigment dispersants, fillers, film-forming aids, anti-cold agents, defoamers, leveling agents, rheology modifiers, preservatives, ultraviolet absorbers, antioxidants, matting agents, lubricants, and vulcanizing agents mentioned above are not particularly limited, and conventional types in this field may be used.

[0051] In a second aspect, this application proposes a super-lubricating coating. According to embodiments of this application, the super-lubricating coating comprises a modified polysiloxane, which includes polysiloxane segments and flexible silane molecular segments grafted onto the polysiloxane segments. Thus, the network-structured polysiloxane segments are solid, allowing them to firmly adhere to the substrate surface, while the flexible silane molecular segments are liquid. Therefore, the grafting of flexible silane molecular segments onto the polysiloxane segments forms a liquid-like super-lubricating coating with adjustable thickness, effectively improving the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively enhancing its lubrication, non-stick, and hydrophobic properties. Simultaneously, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments are further improved, further effectively enhancing the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating.

[0052] According to some specific embodiments of this application, the modified polysiloxane described above includes at least one of the compounds shown in Formula I:

[0053]

[0054] In this design, R1, R2, R3, and R4 are selected from one of the following groups: methyl, ethyl, aminopropyl, mercaptopropyl, chloropropyl, glycidyl ether oxypropyl, oxygen, vinyl, and amide groups, respectively, and n ranges from 8 to 80. Therefore, the modified polysiloxane with the above structure can form a liquid-like superlubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the superlubricating coating in turbulent, mechanically worn, and corrosive environments, and effectively improving its lubrication, non-stick, and hydrophobic properties. Simultaneously, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the superlubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, further effectively enhancing its lubrication, non-stick, and hydrophobic properties.

[0055] In a third aspect, this application proposes a super-slippery coating assembly. According to embodiments of this application, refer to the appendix... Figure 1 and 2The super-lubricating coating assembly includes a substrate layer 100 and a second aspect of a super-lubricating coating 200, the super-lubricating coating 200 being disposed on at least a portion of the surface of the substrate layer 100. Thus, the super-lubricating coating includes a modified polysiloxane, which comprises polysiloxane segments and flexible silane molecular segments grafted into the polysiloxane segments. The network-structured polysiloxane segments are solid and can firmly adhere to the surface of the substrate layer, while the flexible silane molecular segments are liquid. Therefore, the grafting of flexible silane molecular segments into the polysiloxane segments can form a liquid-like super-lubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically abrasive, and corrosive environments, and effectively improving the lubrication performance, non-stick properties, and hydrophobic properties of the super-lubricating coating. Meanwhile, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, and the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating are further effectively enhanced.

[0056] According to some specific embodiments of this application, the thickness of the super-lubricating coating is 5μm to 50μm, for example, it can be 5μm, 10μm, 20μm, 30μm, 40μm, 50μm, etc. Therefore, the super-lubricating coating within this thickness range exhibits excellent durability and mechanical stability in turbulent, mechanically worn and corrosive environments, thereby effectively improving the lubrication performance, non-stick performance and hydrophobic performance of the super-lubricating coating.

[0057] In the embodiments of this application, the specific type of the substrate layer is not particularly limited, and those skilled in the art can select it according to actual needs. As some preferred embodiments, the substrate layer includes at least one of a ceramic substrate layer and a metal substrate layer. Providing a super-lubricating coating on at least a portion of the surface of the above-mentioned type of substrate layer can effectively improve the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments, and effectively improve the lubrication performance, non-stick properties, and hydrophobic properties of the substrate layer.

[0058] In a fourth aspect of this application, a method for preparing the super-lubricated coating assembly of the above embodiments is provided. According to an embodiment of this application, the method includes: mixing a siloxane, a methoxy-terminated polysilane, an acidic catalyst, and an optional co-solvent, and stirring to obtain a first dispersion; mixing the first dispersion with a silica sol and stirring to obtain a second dispersion; coating the second dispersion onto at least a portion of the surface of a substrate, and drying to form a super-lubricated coating, thereby obtaining the super-lubricated coating assembly.

[0059] Specifically, the above methods include:

[0060] S100: Mix siloxane, methoxy-terminated polysilane, acid catalyst and optional cosolvent, and stir to obtain the first dispersion;

[0061] In this step, a certain amount of siloxane, methoxy-terminated polysilane, and optional cosolvent can be added to a flask and mixed evenly. Then, an acidic catalyst is added and stirred at room temperature for 20 to 40 minutes (e.g., 20 minutes, 25 minutes, 30 minutes, 35 minutes, or 40 minutes) to pre-hydrolyze the siloxane and methoxy-terminated polysilane, thereby obtaining the first dispersion.

[0062] S200: Mix the first dispersion and silica sol, stir, and obtain the second dispersion;

[0063] In this step, silica sol can be added to the first dispersion, and a reflux tube can be installed to stir vigorously at room temperature for 3 to 5 hours (e.g., 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, etc.). Siloxane and methoxy-terminated polysilane are hydrolyzed under the action of an acidic catalyst. The hydrolyzed siloxane and silica sol react to form a network structure of polysiloxane segments. The hydrolyzed methoxy-terminated polysilane (i.e., flexible silane molecular chains) is grafted onto the polysiloxane segments to form a liquid-like super-lubricating coating with adjustable thickness.

[0064] S300: The second dispersion is coated on at least a portion of the surface of the substrate and dried to form a super-slippery coating, thereby obtaining a super-slippery coating assembly.

[0065] In this step, the second dispersion can be coated onto at least a portion of the surface of the substrate using coating methods such as spraying, roller coating, curtain coating, or coating with rollers or brushes. Then, it is dried at 5°C to 300°C (e.g., 5°C, 50°C, 100°C, 150°C, 200°C, 250°C, 300°C, etc.) to form a super-slippery coating, ultimately obtaining a super-slippery coating assembly.

[0066] According to the method for preparing a superlubricating coating component according to embodiments of this application, the method can effectively hydrolyze siloxanes and methoxy-terminated polysilanes under the action of an acidic catalyst. The hydrolyzed siloxanes and silica sol react to form a network structure of polysiloxane segments. The hydrolyzed methoxy-terminated polysilanes (i.e., flexible silane molecular chains) are grafted into the polysiloxane segments to form a liquid-like superlubricating coating with adjustable thickness. The network structure of polysiloxane segments is solid, allowing it to adhere firmly to the substrate surface, while the flexible silane molecular chains are liquid. Therefore, they can jointly form a liquid-like superlubricating coating with adjustable thickness, thereby effectively improving the durability and mechanical stability of the superlubricating coating in turbulent, mechanically worn, and corrosive environments, and effectively improving the lubrication, non-stick, and hydrophobic properties of the superlubricating coating. Meanwhile, due to the strong covalent bond between the polysiloxane segments and the flexible silane molecules, the durability and mechanical stability of the super-lubricating coating in turbulent, mechanically worn, and corrosive environments are further improved, and the lubrication, non-stick, and hydrophobic properties of the super-lubricating coating are further effectively enhanced.

[0067] In a fifth aspect, this application provides a cooking utensil. According to embodiments of this application, the cooking utensil includes the super-slip coating component of the above embodiments or the super-slip coating component obtained by the method of the above embodiments. Thus, the cooking utensil possesses excellent and durable stable lubrication properties, non-stick properties, and hydrophobic properties.

[0068] According to some specific embodiments of this application, the cooking appliance includes a container bottom wall and a container side wall, which are connected to form a receiving space where oil or water and food to be cooked can be placed. The container bottom wall includes the super-slippery coating component of the above embodiments or the super-slippery coating component obtained by the method of the above embodiments; and / or, the container side wall includes the super-slippery coating component of the above embodiments or the super-slippery coating component obtained by the method of the above embodiments. By heating the cooking appliance, the food in the receiving space can be cooked. It should be noted that the super-slippery coating is disposed on the side of the cooking appliance facing the food to be cooked.

[0069] According to embodiments of this application, the cooking utensil is selected from at least one of a blender, pressure cooker, rice cooker, stew pot, saucepan, wok, and frying pan. This can satisfy most cooking needs. In addition to the aforementioned structures, the cooking utensil may also include structures typically found in conventional cooking utensil. Taking a wok as an example, it may also include a handle, etc.

[0070] Those skilled in the art will understand that the cooking appliance may further include a heating base, which includes a functional module that enables the heating element assembly to generate heat. According to a specific embodiment of this application, the functional module may be an electromagnetic induction coil, which can generate a magnetic field to induce eddy currents in the heating layer / or the heating element, thereby generating heat and cooking food or the like within the containment space.

[0071] In a sixth aspect, this application discloses a cooking apparatus. According to an embodiment of this application, the cooking apparatus has the cooking utensils described above. This cooking apparatus possesses all the features and advantages of the aforementioned cooking utensils, which will not be repeated here. In general, this cooking apparatus exhibits excellent and durable lubrication properties, non-stick properties, and liquid-repellent properties.

[0072] The embodiments of this application are described in detail below. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. In addition, unless otherwise specified, all reagents used in the following embodiments are commercially available or can be synthesized according to the methods described herein or known methods. For reaction conditions not listed, they are also readily available to those skilled in the art.

[0073] Example 1

[0074] This embodiment provides a super-slippery coating component, the preparation method of which includes:

[0075] (1) Add a certain amount of 25 parts by weight of siloxane (methyltrimethoxysilane), 3 parts by weight of methoxy-terminated polysilane, and 6 parts by weight of cosolvent (propylene glycol methyl ether) to a flask and mix evenly. Then add 0.3 parts by weight of acidic catalyst (formic acid) and stir at room temperature for 30 min to pre-hydrolyze the siloxane and methoxy-terminated polysilane to obtain the first dispersion.

[0076] (2) 22 parts by weight of silica sol (which includes 70 wt% water and 30 wt% silica, with an average particle size of 60 nm) were added to the first dispersion above. The mixture was then attached to a reflux tube and stirred vigorously at room temperature for 4 h. The siloxane and methoxy-terminated polysilane were hydrolyzed under the action of an acidic catalyst. The hydrolyzed siloxane and silica sol reacted to form a network structure of polysiloxane segments. The hydrolyzed methoxy-terminated polysilane (i.e., flexible silane molecular chains) was grafted onto the polysiloxane segments.

[0077] (3) The second dispersion can be coated on the surface of the glass substrate by spraying, and then dried at 150°C to form a super-slippery coating with a thickness of 20μm, and finally obtain the super-slippery coating component.

[0078] Example 2

[0079] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0080] (1) Add a certain amount of 20 parts by weight of siloxane (methyltrimethoxysilane), 5 parts by weight of methoxy-terminated polysilane, and 2 parts by weight of cosolvent (propylene glycol methyl ether) to a flask and mix evenly. Then add 0.1 parts by weight of acidic catalyst (formic acid) and stir at room temperature for 30 minutes to pre-hydrolyze the siloxane and methoxy-terminated polysilane to obtain the first dispersion.

[0081] (2) Add 27 parts by weight of silica sol to the first dispersion above.

[0082] Example 3

[0083] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0084] (1) Add a certain amount of 30 parts by weight of siloxane (methyltrimethoxysilane), 1 part by weight of methoxy-terminated polysilane, and 10 parts by weight of cosolvent (propylene glycol methyl ether) to a flask and mix evenly. Then add 0.5 parts by weight of acidic catalyst (formic acid) and stir at room temperature for 30 minutes to pre-hydrolyze the siloxane and methoxy-terminated polysilane to obtain the first dispersion.

[0085] (2) Add 18 parts by weight of silica sol to the first dispersion above.

[0086] Example 4

[0087] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0088] The siloxane is mercaptopropyltrimethoxysilane, the cosolvent is isopropanol, the acid catalyst is acetic acid, and the silica sol includes 60 wt% water and 40 wt% silica with an average particle size of 100 nm.

[0089] Example 5

[0090] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0091] The siloxane is tetramethoxysilane, the acid catalyst is p-toluenesulfonic acid, and the silica sol includes 50 wt% water and 50 wt% silica with an average particle size of 10 nm.

[0092] Example 6

[0093] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0094] The siloxane is aminopropyltrimethoxysilane.

[0095] Example 7

[0096] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0097] The second dispersion was coated onto the surface of a glass substrate using a spray coating method, and then dried at 150°C to form a super-slippery coating with a thickness of 5 μm.

[0098] Example 8

[0099] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0100] The second dispersion was coated onto the surface of a glass substrate using a spray coating method, and then dried at 150°C to form a super-slippery coating with a thickness of 10 μm.

[0101] Example 9

[0102] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0103] The second dispersion was coated onto the surface of a glass substrate using a spray coating method, and then dried at 150°C to form a super-slippery coating with a thickness of 30 μm.

[0104] Example 10

[0105] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0106] The second dispersion was coated onto the surface of a glass substrate using a spray coating method, and then dried at 150°C to form a super-slippery coating with a thickness of 50 μm.

[0107] Example 11

[0108] This embodiment provides a super-slippery coating component, the preparation method of which is basically the same as that of Embodiment 1, except that:

[0109] Replace the glass substrate with a metal substrate.

[0110] Comparative Example 1

[0111] This comparative example provides a glass substrate identical to that of Example 1, but without forming a super-slippery coating on the glass substrate.

[0112] Comparative Example 2

[0113] This comparative example provides a super-lubricated coating component, the preparation method of which is basically the same as that of Example 1, except that:

[0114] The polysilane is polydimethylsiloxane.

[0115] Static water contact angle test, roll-off angle test, abrasion resistance test and non-stick performance test were performed on the super-slippery coating components of Examples 1 to 11 and the glass substrates of Comparative Examples 1 to 2, respectively. The results are shown in Table 1.

[0116] The static water contact angle of the coating surface was tested using a contact angle tester, and the roll-off angle of the coating surface was also tested using a contact angle tester.

[0117] Methods for testing abrasion resistance:

[0118] The wear resistance was evaluated by testing the static water contact angle of the coating surface after 20,000 cycles of friction using an abrasion testing machine. Test parameters: 1 kg load, 2 cm * 2 cm grinding head area, and rubber + alcohol as the friction medium.

[0119] Methods for testing non-stick properties:

[0120] The non-stickiness test of fried eggs was conducted according to the provisions of 4.2.1 in the national standard GB / T 32095.2-2015.

[0121] Table 1

[0122]

[0123] As can be seen from Table 1, compared with Comparative Example 1, Examples 1-11 exhibit higher static water contact angles and lower roll-off angles, resulting in significantly improved wear resistance and non-stick properties. Furthermore, compared with Comparative Example 2, the super-slippery coatings of Examples 1-11 demonstrate excellent wear resistance. It is evident that forming a super-slippery coating comprising the modified polysiloxane shown in Formula I on the substrate surface can effectively improve the substrate's lubrication, non-stick, and hydrophobic properties, and the resulting super-slippery coating exhibits excellent wear resistance.

[0124] In this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0125] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A composition for super-slippery coating, characterized by, include: 18 to 27 parts by weight of silica sol, 20 to 30 parts by weight of siloxane, 1 to 5 parts by weight of methoxy-terminated polysilane and 0.1 to 0.5 parts by weight of acidic catalyst.

2. The composition for super-slippery coating according to claim 1, wherein The silica sol comprises 50 wt% to 70 wt% water and 30 wt% to 50 wt% silica.

3. The composition for super-slippery coating according to claim 2, wherein The silica particles are at the nanometer level.

4. The composition for super-slippery coating according to claim 3, wherein The average particle size of the silica is 10 nm to 100 nm.

5. The composition for super-slippery coating according to claim 1, wherein The siloxane includes at least one of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, glycidoxypropyltrimethoxysilane, glycidoxypropyltriethoxysilane, chloropropyltrimethoxysilane, and chloropropyltriethoxysilane.

6. The composition for super-slippery coating according to claim 1, wherein The molecular weight of the methoxy-terminated polysilane is 1,000 to 100,000.

7. The composition for super-slippery coating according to claim 1, wherein The acidic catalyst includes organic acids.

8. The composition for super- slippery coating according to claim 7, wherein The acidic catalyst includes at least one of formic acid, acetic acid, and p-toluenesulfonic acid.

9. The composition for a super- slippery coating according to any one of claims 1 to 8, wherein Also includes: 1 to 10 parts by weight of co-solvent.

10. The composition for a super-lubricating coating according to claim 9, characterized in that, The co-solvent includes at least one of propylene glycol methyl ether and isopropanol.

11. The composition for a super-lubricating coating according to any one of claims 1 to 8, characterized in that, Also includes: At least one of pigments, pigment dispersants, fillers, film-forming aids, anti-cold agents, defoamers, leveling agents, rheology modifiers, preservatives, ultraviolet absorbers, antioxidants, matting agents, lubricants, and vulcanizing agents.

12. A super-slippery coating, characterized in that, include: A modified polysiloxane, comprising polysiloxane segments and flexible silane molecular segments, wherein the flexible silane molecular segments are grafted onto the polysiloxane segments.

13. The super-slippery coating according to claim 12, characterized in that, The modified polysiloxane includes at least one of the compounds shown in Formula I: R1, R2, R3 and R4 are selected from one of methyl, ethyl, aminopropyl, mercaptopropyl, chloropropyl, glycidyl ether oxypropyl, oxygen, vinyl, and amide groups, respectively, and n ranges from 8 to 80.

14. A super-slippery coating assembly, characterized in that, include: Substrate layer; The super-slippery coating of claim 12 or 13, wherein the super-slippery coating is disposed on at least a portion of the surface of the substrate layer.

15. The super-slippery coating assembly according to claim 14, characterized in that, The thickness of the super-slippery coating is 5μm to 50μm.

16. The super-lubricated coating assembly according to claim 14, characterized in that, The substrate layer includes at least one of a ceramic substrate layer and a metal substrate layer.

17. A method for preparing a super-lubricated coating assembly according to any one of claims 14 to 16, characterized in that, include: The siloxane, methoxy-terminated polysilane, acidic catalyst, and optional co-solvent are mixed and stirred to obtain the first dispersion. The first dispersion and silica sol were mixed and stirred to obtain the second dispersion; The second dispersion is coated onto at least a portion of the surface of the substrate and dried to form a super-slippery coating, thereby obtaining a super-slippery coating assembly.

18. A cooking utensil, characterized in that, Includes the super-slippery coating assembly according to any one of claims 14 to 16 or the super-slippery coating assembly prepared by the method of claim 17.

19. The cooking utensil according to claim 18, characterized in that, It includes a container bottom wall and a container side wall, the container bottom wall and the container side wall are connected to form a receiving space; The container bottom wall comprises the super-slip coating assembly of any one of claims 14 to 16 or the super-slip coating assembly obtained by the method of claim 17; and / or, the container side wall comprises the super-slip coating assembly of any one of claims 14 to 16 or the super-slip coating assembly obtained by the method of claim 17.

20. A cooking appliance, characterized in that, Includes the cooking appliance as described in claim 18 or 19.

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