A stainless steel sink powder coating and its preparation method and application

Abstract

The present application relates to a kind of stainless steel sink powder coating and its preparation method and application, the stainless steel sink powder coating includes epoxy resin 30 parts;Curing agent 5 parts~10 parts;Hollow glass microsphere 20 parts~30 parts;SBS elastic microsphere 5 parts~10 parts;Amino resin 3 parts~10 parts;Mica powder 5 parts~10 parts;Polyoxyethylene glycol ether 0.5 parts~1 part.The coating formed by the stainless steel sink powder coating has good wear resistance, and can resist cold and hot temperature rapid change without discoloration, crack or fall off, and keep good wear resistance.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology, specifically to a stainless steel sink powder coating, its preparation method, and its application. Background Technology

[0002] Stainless steel sinks are sinks made of stainless steel and can be used in homes, commercial kitchens, laboratories, medical facilities, or other industrial applications. Applying a coating to stainless steel sinks protects them from scratches.

[0003] In some specific applications of stainless steel sinks, such as in commercial kitchens or industrial settings, they often need to withstand alternating hot and cold liquids. However, with existing powder coatings for stainless steel sinks, rapid temperature changes can cause discoloration, cracking, or peeling of the coating, affecting the lifespan of both the coating and the sink itself. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the first objective of the present invention is to provide a stainless steel sink powder coating. The coating formed by the stainless steel sink powder coating has good wear resistance and can withstand rapid changes in hot and cold temperatures without discoloration, cracking or peeling, and maintains good wear resistance.

[0005] A second objective of this invention is to provide a method for preparing the powder coating for the stainless steel sink.

[0006] A third objective of this invention is to provide the application of the powder coating on the stainless steel sink.

[0007] To achieve the first objective of this invention, a stainless steel sink powder coating is provided, comprising the following components in parts by weight: 30 parts epoxy resin; 5-10 parts curing agent; 20-30 parts hollow glass microspheres; 5-10 parts SBS elastic microspheres; 3-10 parts amino resin; 5-10 parts mica powder; and 0.5-1 parts polyoxyethylene glycerol ether. The hollow glass microspheres and mica powder are treated with an epoxy-containing silane coupling agent; the SBS elastic microspheres are photo-oxidized, and the epoxy content of the SBS elastic microspheres after photo-oxidation is 0.05 mmol / g to 0.1 mmol / g.

[0008] In some embodiments of the present invention, the stainless steel sink powder coating comprises the following components in parts by weight: 30 parts epoxy resin; 8 to 10 parts curing agent; 20 to 25 parts hollow glass microspheres; 8 to 10 parts SBS elastic microspheres; 3 to 8 parts amino resin; 8 to 10 parts mica powder; and 0.5 to 0.8 parts polyoxyethylene glycerol ether.

[0009] In some embodiments of the present invention, the epoxy group content of the SBS elastic microspheres after photo-oxidation is 0.05 mmol / g to 0.08 mmol / g.

[0010] In some embodiments of the present invention, the average particle size of the hollow glass microspheres is 30 μm to 120 μm.

[0011] In some embodiments of the present invention, the particle size of the SBS elastic microspheres is 40 μm to 100 μm.

[0012] In some embodiments of the present invention, the particle size of the mica powder is 10 μm to 50 μm.

[0013] In some embodiments of the present invention, the epoxy resin includes E12 epoxy resin.

[0014] In some embodiments of the present invention, the curing agent includes aromatic amine curing agents.

[0015] In some embodiments of the present invention, the amount of the epoxy-containing silane coupling agent is 0.5wt% to 1wt% of the total mass of the hollow glass microspheres and the mica powder.

[0016] To achieve the second objective of this invention, this invention provides a method for preparing a stainless steel sink powder coating as described in any of the above embodiments, comprising the following steps:

[0017] Step 1: Treat the hollow glass microspheres and the mica powder with an epoxy-containing silane coupling agent; subject the SBS elastic microspheres to photo-oxidation treatment;

[0018] Step 2: The epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder, and polyoxyethylene glycerol ether are dispersed evenly at a first temperature to obtain a mixture;

[0019] Step 3: Add the curing agent and the amino resin to the mixture and disperse them evenly at a second temperature.

[0020] In some embodiments of the present invention, in step one, treating the hollow glass microspheres and the mica powder with an epoxy-containing silane coupling agent includes: dispersing the hollow glass microspheres and the mica powder and immersing them in an ethanol-water solution containing an epoxy-containing silane coupling agent, removing the solvent, and obtaining the treated hollow glass microspheres and the mica powder.

[0021] In some embodiments of the present invention, photo-oxidation treatment of the SBS elastic microspheres includes: dispersing the SBS elastic microspheres in a mixed solution of ethanol and ethyl acetate containing organic peroxides, and reacting under ultraviolet light irradiation to obtain the treated SBS elastic microspheres.

[0022] In some embodiments of the present invention, in the ethanol-water solution containing the epoxy-containing silane coupling agent, the mass concentration of the epoxy-containing silane coupling agent is 5wt%~10wt%, and the volume ratio of ethanol to water is (3~4):1; the epoxy-containing silane coupling agent is at least one of 3-(2,3-epoxypropoxy)propyltrimethoxysilane and 3-(2,3-epoxypropoxy)propyltriethoxysilane.

[0023] In some embodiments of the present invention, in the ethanol and ethyl acetate mixed solution containing organic peroxide, the mass concentration of the organic peroxide is 5wt% to 10wt%, and the volume ratio of ethanol to ethyl acetate is 1:(1 to 2); the organic peroxide is at least one of peracetic acid and tert-butyl hydroperoxide.

[0024] In some embodiments of the present invention, steps two and three are performed in an extruder, and the first temperature is greater than the second temperature.

[0025] To achieve the third objective of this invention, this invention provides a stainless steel sink, comprising a sink body and a coating covering the surface of the sink body, the coating being made of a stainless steel sink powder coating as described in any of the above embodiments.

[0026] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0027] The stainless steel sink powder coating of the present invention uses epoxy resin as the main film-forming resin. By adding specific amounts of hollow glass microspheres, SBS elastic microspheres, amino resin and mica powder, the coating has good wear resistance and good adhesion to stainless steel sinks. It can withstand rapid alternation of hot and cold temperatures without discoloration, cracking or peeling. It maintains good adhesion and wear resistance after being subjected to alternating hot and cold temperatures. Attached Figure Description

[0028] Figure 1 This is the infrared spectrum of the SBS elastic microspheres prepared in Example 1 of the stainless steel sink powder coating of the present invention.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0030] The present invention provides a stainless steel sink powder coating, which has good adhesion to stainless steel materials, the resulting coating has good wear resistance, and the resulting coating does not produce appearance quality problems when subjected to rapid temperature changes, and can still maintain good adhesion and wear resistance after temperature changes.

[0031] Specifically, the stainless steel sink powder coating of this embodiment includes the following components in parts by weight: 30 parts epoxy resin; 5 to 10 parts curing agent; 20 to 30 parts hollow glass microspheres; 5 to 10 parts SBS elastic microspheres; 3 to 10 parts amino resin; 5 to 10 parts mica powder; and 0.5 to 1 part polyoxyethylene glycerol ether.

[0032] Epoxy resin, as the main film-forming substance in powder coatings, can form a tough film layer during the curing process, giving the powder coating good adhesion and mechanical properties, and making the coating have high strength and durability.

[0033] The curing agent undergoes a chemical cross-linking reaction with the epoxy resin in the epoxy resin, causing the linear epoxy resin molecules to cross-link into a three-dimensional network structure, thereby achieving the curing of the powder coating and forming a hard and stable coating film. The curing agent comprises 5 to 10 parts by weight relative to 30 parts by weight of epoxy resin, for example, 5, 6, 7, 8, 9, or 10 parts.

[0034] Hollow glass microspheres, as the main filler in powder coatings, have a hollow internal structure that effectively blocks heat transfer, giving the coating a certain degree of thermal insulation. This helps regulate the temperature of the substrate, reducing heat loss or absorption and improving the thermal stability of the substrate. Consequently, the resulting coating remains stable during rapid temperature changes caused by alternating hot and cold cycles, preventing performance degradation. The hollow glass microspheres are treated with an epoxy-based silane coupling agent, allowing them to mix better with epoxy resin and disperse more effectively in the powder coating, preventing sedimentation. In this embodiment, the mass fraction of hollow glass microspheres refers to the mass fraction of hollow glass microspheres treated with the epoxy-based silane coupling agent. For an epoxy resin mass fraction of 30 parts, the mass fraction of hollow glass microspheres can be 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 parts, etc.

[0035] SBS elastic microspheres possess excellent elasticity, enabling the coating to exhibit a certain degree of flexibility after curing. This improves the coating's impact resistance and crack resistance, allowing it to better adapt to alternating temperature changes and reducing coating cracking and peeling caused by temperature stress. The SBS elastic microspheres undergo photo-oxidation treatment, which oxidizes the double bonds of the butene chains, resulting in epoxy groups. The epoxy group content of the SBS elastic microspheres ranges from 0.05 mmol / g to 0.1 mmol / g, for example, 0.05 mmol / g, 0.06 mmol / g, 0.07 mmol / g, 0.08 mmol / g, 0.09 mmol / g, and 0.1 mmol / g. This allows the SBS elastic microspheres to be better dispersed in the powder coating, preventing sedimentation and ensuring their flexibility. The amount of SBS elastic microspheres used refers to the amount of SBS elastic microspheres after photo-oxidation treatment. For epoxy resin, the mass fraction is 30 parts, and the mass fraction of SBS elastic microspheres is 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0036] Amino resins can contain melamine formaldehyde structures, such as linear melamine formaldehyde. During the curing process, amino resins can undergo a cross-linking reaction with epoxy resins to form a denser network structure, thereby improving the coating's hardness, abrasion resistance, and durability, enabling the coating to better resist friction and enhancing its overall durability. For an epoxy resin composition of 30 parts by weight, the amount of amino resin can be 3, 4, 5, 6, 7, 8, 9, or 10 parts, etc.

[0037] Mica powder has a two-dimensional lamellar structure, which can improve the mechanical properties and wear resistance of the coating. It also acts as a barrier to heat transfer, helping to regulate the coating temperature, reduce heat loss or absorption, and prevent damage to the coating due to temperature changes. The mica powder is treated with an epoxy-based silane coupling agent, allowing it to mix better with epoxy resin and disperse more effectively in the powder coating, preventing mica powder sedimentation. The dosage of mica powder is typically 5, 6, 7, 8, 9, or 10 parts per 30 parts by weight of epoxy resin.

[0038] Polyoxyvinyl glycerol ether is a nonionic surfactant that promotes the dispersion of hollow glass microspheres, SBS elastic microspheres, and mica powder in powder coatings. It also acts as an antifoaming agent, resulting in a more uniform coating and improved performance. The dosage of polyoxyvinyl glycerol ether is 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, and 1 part, respectively, relative to 30 parts by weight of epoxy resin.

[0039] As can be seen from the above, the stainless steel sink powder coating of this embodiment uses epoxy resin, curing agent, and amino resin as the resin matrix. The combination of epoxy resin and amino resin can improve the mechanical properties of the coating and has good wear resistance. Furthermore, by adding hollow glass microspheres, SBS elastic microspheres, and mica powder, these three fillers are combined in a specific ratio, giving the coating both good wear resistance and temperature change resistance. Polyoxyethylene glycerol ether is also used to promote the dispersion of the raw materials. Through the interaction of the above raw materials, a powder coating with good wear resistance and adhesion, and capable of withstanding rapid temperature changes, is obtained.

[0040] In some examples, the stainless steel sink powder coating of this embodiment mainly consists of the following components in parts by weight: 30 parts epoxy resin; 5 to 10 parts curing agent; 20 to 30 parts hollow glass microspheres; 5 to 10 parts SBS elastic microspheres; 3 to 10 parts amino resin; 5 to 10 parts mica powder; and 0.5 to 1 part polyoxyethylene glycerol ether. In addition to the above components, the powder coating may also contain a small amount of functional additives, such as pigments and colorants.

[0041] In some examples, the stainless steel sink powder coating of this embodiment consists of the following components in parts by weight: 30 parts epoxy resin; 5 to 10 parts curing agent; 20 to 30 parts hollow glass microspheres; 5 to 10 parts SBS elastic microspheres; 3 to 10 parts amino resin; 5 to 10 parts mica powder; and 0.5 to 1 part polyoxyethylene glycerol ether. Apart from the above components and unavoidable impurities, the powder coating contains no other components, resulting in a simpler composition while meeting performance requirements.

[0042] In some examples, the stainless steel sink powder coating of this embodiment includes 30 parts epoxy resin; 8 to 10 parts curing agent; 20 to 25 parts hollow glass microspheres; 8 to 10 parts SBS elastic microspheres; 3 to 8 parts amino resin; 8 to 10 parts mica powder; and 0.5 to 0.8 parts polyoxyethylene glycerol ether. When the amounts of each component are within the above ranges, the temperature change resistance of the coating can be further improved.

[0043] In some examples, the epoxy group content of the SBS elastic microspheres after photo-oxidation is 0.05 mmol / g to 0.08 mmol / g. Within this range, the epoxy group content can further improve the coating's resistance to temperature changes and prevent excessive oxidation of the SBS elastic microspheres from affecting the coating's resistance to temperature-induced cracking.

[0044] In some examples, the average particle size of hollow glass microspheres is 30μm to 120μm. When the particle size of hollow glass microspheres is within the above range, it can play a good role in improving performance and is beneficial to the dispersion of hollow glass microspheres in powder coatings.

[0045] In some examples, the average particle size of SBS elastic microspheres is 40μm~100μm. When the average particle size of SBS elastic microspheres is within the above range, the role of SBS elastic microspheres in improving the resistance to temperature cracking can be better exerted, and it is also beneficial for the dispersion of SBS elastic microspheres in powder coatings.

[0046] In some examples, the particle size of mica powder is 10μm~50μm, which is beneficial to improving the mechanical properties and wear resistance of the coating, and also to the dispersion of mica powder in powder coatings.

[0047] In some examples, the epoxy resin is E12 epoxy resin, which is solid at room temperature, thus improving the storage stability of the powder coating.

[0048] In some examples, the curing agent includes aromatic amine curing agents, which are well dispersed in epoxy resins and can react with epoxy resins under heating conditions.

[0049] In some examples, the amount of epoxy-containing silane coupling agent used is 0.5wt% to 1wt% of the total mass of hollow glass microspheres and mica powder, which can promote the dispersion of hollow glass microspheres and mica powder.

[0050] In some examples, the preparation method of stainless steel sink powder coating includes the following steps:

[0051] Step 1: Treat hollow glass microspheres and mica powder with an epoxy-containing silane coupling agent. Before, after, or simultaneously with the silane coupling agent treatment, perform photo-oxidation treatment on SBS elastic microspheres to obtain treated hollow glass microspheres, SBS elastic microspheres, and mica powder for later use.

[0052] Step 2: Disperse epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether evenly at the first temperature to obtain a mixture.

[0053] Step 3: Add the curing agent and amino resin to the mixture and disperse them evenly at the second temperature to obtain the powder coating.

[0054] In some examples, in step one, treating the hollow glass microspheres and mica powder with an epoxy-containing silane coupling agent includes: dispersing the hollow glass microspheres and mica powder and immersing them in an ethanol-water solution containing an epoxy-containing silane coupling agent, removing the solvent, and obtaining the treated hollow glass microspheres and mica powder, such that the silane coupling agent can be stably attached to the hollow glass microspheres and mica powder.

[0055] In some examples, the photo-oxidation treatment of SBS elastic microspheres in step one includes: dispersing the SBS elastic microspheres in a mixed solution of ethanol and ethyl acetate containing organic peroxides, and reacting under ultraviolet light to obtain treated SBS elastic microspheres. The reaction conditions are mild and can effectively introduce epoxy groups into the SBS elastic microspheres.

[0056] In some examples, the ethanol-water solution containing an epoxy-containing silane coupling agent has a mass concentration of 5 wt% to 10 wt%, and the volume ratio of ethanol to water is (3 to 4):1, which is beneficial for the dispersion and modification of the silane coupling agent. The epoxy-containing silane coupling agent is at least one of 3-(2,3-epoxypropoxy)propyltrimethoxysilane and 3-(2,3-epoxypropoxy)propyltriethoxysilane.

[0057] In some examples, the organic peroxide is present in a mixed solution of ethanol and ethyl acetate with a mass concentration of 5 wt% to 10 wt% and a volume ratio of ethanol to ethyl acetate of 1:(1~2), allowing the SBS elastic microspheres to be uniformly oxidized. The organic peroxide is at least one of peracetic acid and tert-butyl hydroperoxide.

[0058] In some examples, steps two and three are performed separately in an extruder, making mixing quick and convenient.

[0059] In some examples, the second temperature is lower than the first temperature to avoid the powder coating curing prematurely due to temperature rise.

[0060] In some examples, the powder coating described above can be applied to a stainless steel sink, which includes a sink body. The powder coating is applied to the surface of the sink body to form a coating with good adhesion and abrasion resistance, and is resistant to temperature changes, maintaining good adhesion and abrasion resistance even after being subjected to temperature changes.

[0061] The present invention will be further described in detail below through specific embodiments.

[0062] The raw materials used in the following examples and comparative examples are as follows:

[0063] Epoxy resin, E12, purchased from Langbowan Biopharmaceutical Co., Ltd.

[0064] Curing agent, m-phenylenediamine, purchased from Shandong Yukang Chemical Co., Ltd.;

[0065] Hollow glass microspheres with an average particle size of approximately 60 μm, manufactured by 3M as K15.

[0066] SBS elastic microspheres, with an average particle size of about 60 μm, were prepared in-house by dissolving SBS in toluene and then adding it dropwise to an aqueous solution with an emulsifier concentration of 2%, stirring to disperse, filtering, and drying.

[0067] Amino resin, purchased from Huaxiang Kejie;

[0068] Mica powder, with an average particle size of approximately 45μm, was purchased from Zhuolei Building Materials.

[0069] Polyoxyvinyl glycerol ether, brand name Sanda G-18;

[0070] KH560 silane coupling agent, purchased from Hui'an Chemical;

[0071] tert-butyl hydroperoxide, purchased from Sigma-Aldrich.

[0072] Example 1

[0073] The following are the components of the stainless steel sink powder coating in this embodiment: 30 parts epoxy resin, 8 parts curing agent, 20 parts hollow glass microspheres, 10 parts SBS elastic microspheres, 8 parts amino resin, 8 parts mica powder, and 0.8 parts polyoxyethylene glycerol ether.

[0074] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0075] (1) Treatment of hollow glass microspheres and mica powder: The hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 3:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 5wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 0.5wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation and dried to obtain the treated hollow glass microspheres and mica powder.

[0076] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide. The concentration of tert-butyl hydroperoxide was 5 wt%. After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm with an irradiation intensity of 5 mW / cm² for 10 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The oxidized SBS elastic microspheres obtained in step (2) were subjected to infrared spectroscopy analysis, such as... Figure 1 As shown, 911cm is visible. -1 A distinct epoxy group absorption peak was observed, indicating the introduction of epoxy groups. The epoxy group content was determined to be 0.05 mmol / g by titration using the hydrochloric acid-pyridine method.

[0077] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0078] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0079] Example 2

[0080] The following are the components of the stainless steel sink powder coating in this embodiment: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, 10 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0081] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0082] (1) Treatment of hollow glass microspheres and mica powder: The hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation and dried to obtain the treated hollow glass microspheres and mica powder.

[0083] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide. The concentration of tert-butyl hydroperoxide was 5 wt%. After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm with an irradiation intensity of 5 mW / cm² and an irradiation time of 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy content was measured to be 0.08 mmol / g.

[0084] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0085] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0086] Example 3

[0087] The following are the components of the stainless steel sink powder coating in this embodiment: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 10 parts SBS elastic microspheres, 4 parts amino resin, 10 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0088] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0089] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0090] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0091] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0092] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0093] Example 4

[0094] The following are the components of the stainless steel sink powder coating in this embodiment: 30 parts epoxy resin, 5 parts curing agent, 30 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 10 parts amino resin, 5 parts mica powder, and 1 part polyoxyethylene glycerol ether.

[0095] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0096] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 3:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 5 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 0.5 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 1 was used.

[0097] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 10 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.05 mmol / g. The same batch as in Example 1 was used.

[0098] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0099] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0100] Example 5

[0101] The following are the components of the stainless steel sink powder coating in this embodiment: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, 10 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0102] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0103] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0104] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide. The concentration of tert-butyl hydroperoxide was 5 wt%. After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm with an irradiation intensity of 5 mW / cm² and an irradiation time of 40 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy content was measured to be 0.10 mmol / g.

[0105] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0106] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0107] Example 6

[0108] The following are the components of the stainless steel sink powder coating in this embodiment: 30 parts epoxy resin, 9 parts curing agent, 24 parts hollow glass microspheres, 5 parts SBS elastic microspheres, 3 parts amino resin, 5 parts mica powder, and 1 part polyoxyethylene glycerol ether.

[0109] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0110] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0111] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0112] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0113] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0114] Comparative Example 1

[0115] The proportions of each component in the powder coating of this comparative example are as follows: 30 parts epoxy resin, 10 parts curing agent, 3 parts amino resin, 43 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0116] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0117] (1) Treatment of mica powder: Disperse and soak mica powder in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent is 10wt%, and the mass of KH560 silane coupling agent relative to mica powder is 1wt%. After soaking for 2 hours, remove the solvent by rotary evaporation and dry to obtain the treated mica powder.

[0118] (2) The epoxy resin, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0119] (3) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0120] Comparative Example 2

[0121] The powder coating components in this comparative example are: 30 parts epoxy resin, 10 parts curing agent, 10 parts hollow glass microspheres, 10 parts SBS elastic microspheres, 3 parts amino resin, 15 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0122] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0123] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0124] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0125] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0126] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0127] Comparative Example 3

[0128] The proportions of each component in the powder coating of this comparative example are as follows: 30 parts epoxy resin, 10 parts curing agent, 40 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, 10 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0129] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0130] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0131] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0132] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0133] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0134] Comparative Example 4

[0135] The powder coating components in this comparative example are: 30 parts epoxy resin, 10 parts curing agent, 20 parts hollow glass microspheres, 15 parts SBS elastic microspheres, 3 parts amino resin, 8 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0136] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0137] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0138] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0139] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0140] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0141] Comparative Example 5

[0142] The proportions of each component in the powder coating of this comparative example are as follows: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, 10 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0143] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0144] (2) Epoxy resin, hollow glass microspheres, unoxidized SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0145] (3) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0146] Comparative Example 6

[0147] The powder coating components in this comparative example are: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, 10 parts mica powder, and 0.5 parts polyoxyethylene glycerol ether.

[0148] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0149] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0150] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide. The concentration of tert-butyl hydroperoxide was 5 wt%. After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm with an irradiation intensity of 5 mW / cm² and an irradiation time of 100 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy content was measured to be 0.2 mmol / g.

[0151] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0152] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0153] Comparative Example 7

[0154] The proportions of each component in the powder coating of this comparative example are as follows: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, and 10 parts mica powder.

[0155] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0156] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0157] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0158] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres and mica powder are extruded and mixed at 110°C and then crushed to obtain a mixture.

[0159] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0160] Comparative Example 8

[0161] The powder coating components in this comparative example are: 30 parts epoxy resin, 10 parts curing agent, 25 parts hollow glass microspheres, 8 parts SBS elastic microspheres, 3 parts amino resin, 10 parts mica powder, and 3 parts polyoxyethylene glycerol ether.

[0162] The preparation steps of the stainless steel water tank powder coating in this embodiment are as follows:

[0163] (1) Treatment of hollow glass microspheres and mica powder: Hollow glass microspheres and mica powder were dispersed and soaked in an ethanol-water (volume ratio 4:1) solution containing KH560 silane coupling agent. The concentration of KH560 silane coupling agent was 10 wt%, and the total mass of KH560 silane coupling agent relative to the hollow glass microspheres and mica powder was 1 wt%. After soaking for 2 hours, the solvent was removed by rotary evaporation, and the mixture was dried to obtain the treated hollow glass microspheres and mica powder. The same batch as in Example 2 was prepared.

[0164] (2) Treatment of SBS elastic microspheres: SBS elastic microspheres were dispersed in a mixed solution of ethanol and ethyl acetate (volume ratio 1:1) containing tert-butyl hydroperoxide (5wt%). After soaking at room temperature for 24 h, the microspheres were reacted under ultraviolet light at a wavelength of 254 nm (5 mW / cm²) for 20 min. The microspheres were then filtered, washed, and dried to obtain the treated SBS elastic microspheres. The epoxy group content was measured to be 0.08 mmol / g. The same batch as in Example 2 was used.

[0165] (3) Epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder and polyoxyethylene glycerol ether are extruded and mixed at 110°C and then pulverized to obtain a mixture.

[0166] (4) The curing agent and amino resin are mixed with the mixture, extruded and mixed at 95°C, and then pulverized to obtain powder coating.

[0167] The amounts of each component used in the examples and comparative examples are summarized in Table 1 below.

[0168] Table 1 Formulation Composition

[0169] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Epoxy resin 30 30 30 30 30 30 30 30 30 30 30 30 30 30 curing agent 8 10 10 5 10 9 10 10 10 10 10 10 10 10 Hollow glass microspheres 20 25 25 30 25 24 0 10 40 20 25 25 25 25 SBS elastic microspheres 10 8 10 8 8 5 0 10 8 15 8 8 8 8 Amino resins 8 3 4 10 3 3 3 3 3 3 3 3 3 3 mica powder 8 10 10 5 10 5 43 15 10 8 10 10 10 10 Polyoxyvinyl glycerol ether 0.8 0.5 0.5 1 0.5 1 0.5 0.5 0.5 0.5 0.5 0.5 0 3 The amount of silane coupling agent relative to hollow glass microspheres and mica powder (wt%) 0.5 1 1 0.5 1 1 1 1 1 1 1 1 1 1 Epoxy group content (mmol / g) of SBS elastic microspheres 0.05 0.08 0.08 0.05 0.1 0.08 — 0.08 0.08 0.08 0 0.2 0.08 0.08

[0170] The powder coatings were sprayed onto the surface of stainless steel plates and cured by heating to obtain a coating with a thickness of approximately 0.8 mm.

[0171] The coatings of each embodiment and comparative example were subjected to adhesion and abrasion resistance tests, with adhesion tested according to GB / T9286-2021 and abrasion resistance tested according to GB / T1768-2006, using a 500g weight and a grinding wheel rotating 500 times.

[0172] For each example and comparative coating, a rapid temperature change test was performed. The coatings were alternately immersed in boiling water at 100°C for 5 minutes, and then immediately immersed in an ice-water mixture at 0°C for 5 minutes. This cycle was repeated 72 times per day for 3 consecutive days, with an interval of at least 10 hours between two consecutive cycles. During the interval, the coatings were left at room temperature. The surface appearance of the coatings was observed, and the adhesion and abrasion resistance of the coatings after the temperature change test were tested.

[0173] The test results are shown in Table 2 below.

[0174] Table 2 Test Results

[0175]

[0176] As can be seen from the above, Embodiments 1 to 6 of the present invention have good adhesion and wear resistance, and good resistance to temperature changes. They can still maintain good adhesion and wear resistance after alternating contact with high and low temperature liquids.

[0177] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stainless steel sink powder coating, characterized in that... The components include the following parts by mass: 30 parts epoxy resin; 5 to 10 parts of curing agent; 20-30 parts of hollow glass microspheres; 5 to 10 parts of SBS elastic microspheres; 3 to 10 parts of amino resin; 5 to 10 parts mica powder; 0.5 to 1 part of polyoxyethylene glycerol ether; The hollow glass microspheres and mica powder are treated with an epoxy-containing silane coupling agent; the SBS elastic microspheres are subjected to photo-oxidation treatment, which includes: dispersing the SBS elastic microspheres in a mixed solution of ethanol and ethyl acetate containing organic peroxides, and reacting under ultraviolet light to obtain the treated SBS elastic microspheres; the epoxy content of the SBS elastic microspheres after photo-oxidation is 0.05 mmol / g to 0.1 mmol / g.

2. The stainless steel water tank powder coating according to claim 1, characterized in that... The components include the following parts by mass: 30 parts epoxy resin; 8 to 10 parts of curing agent; 20-25 parts of hollow glass microspheres; 8 to 10 parts of SBS elastic microspheres; 3 to 8 parts of amino resin; 8 to 10 parts mica powder; 0.5 to 0.8 parts of polyoxyethylene glycerol ether.

3. A stainless steel sink powder coating according to claim 1 or 2, characterized in that... The SBS elastic microspheres, after photo-oxidation, have an epoxy group content of 0.05 mmol / g to 0.08 mmol / g.

4. A stainless steel water tank powder coating according to claim 1 or 2, characterized in that... The hollow glass microspheres have an average particle size of 30 μm to 120 μm. The particle size of the SBS elastic microspheres is 40μm~100μm; The particle size of the mica powder is 10μm~50μm.

5. A stainless steel water tank powder coating according to claim 1 or 2, characterized in that... The epoxy resin includes E12 epoxy resin; The curing agent includes aromatic amine curing agents.

6. A stainless steel water tank powder coating according to claim 1 or 2, characterized in that... The amount of the epoxy-containing silane coupling agent is 0.5wt% to 1wt% of the total mass of the hollow glass microspheres and the mica powder.

7. A method for preparing a stainless steel sink powder coating according to any one of claims 1 to 6, characterized in that... Includes the following steps: Step 1: Treat the hollow glass microspheres and the mica powder with an epoxy-containing silane coupling agent; subject the SBS elastic microspheres to photo-oxidation treatment; Step 2: The epoxy resin, hollow glass microspheres, SBS elastic microspheres, mica powder, and polyoxyethylene glycerol ether are dispersed evenly at a first temperature to obtain a mixture; Step 3: Add the curing agent and the amino resin to the mixture and disperse them evenly at a second temperature.

8. The method for preparing a stainless steel water tank powder coating according to claim 7, characterized in that... In step one, treating the hollow glass microspheres and the mica powder with an epoxy-containing silane coupling agent includes: dispersing the hollow glass microspheres and the mica powder and immersing them in an ethanol-water solution containing an epoxy-containing silane coupling agent, removing the solvent, and obtaining the treated hollow glass microspheres and the mica powder.

9. The method for preparing a stainless steel water tank powder coating according to claim 8, characterized in that... In the ethanol-water solution containing the epoxy-containing silane coupling agent, the mass concentration of the epoxy-containing silane coupling agent is 5wt%~10wt%, and the volume ratio of ethanol to water is (3~4):1; the epoxy-containing silane coupling agent is at least one of 3-(2,3-epoxypropoxy)propyltrimethoxysilane and 3-(2,3-epoxypropoxy)propyltriethoxysilane. In the ethanol and ethyl acetate mixed solution containing organic peroxide, the mass concentration of the organic peroxide is 5wt%~10wt%, and the volume ratio of ethanol to ethyl acetate is 1:(1~2); the organic peroxide is at least one of peracetic acid and tert-butyl hydroperoxide. Steps two and three are performed in an extruder, with the first temperature being higher than the second temperature.

10. A stainless steel water tank, characterized in that... The product includes a sink body and a coating covering the surface of the sink body, the coating being made of a stainless steel sink powder coating as described in any one of claims 1 to 6, or a stainless steel sink powder coating prepared by the preparation method described in any one of claims 7 to 9.

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