CN113583486A - Sterilization temperature-resistant coating and preparation method and use method thereof - Google Patents
Sterilization temperature-resistant coating and preparation method and use method thereof Download PDFInfo
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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Abstract
The invention provides a sterilization temperature-resistant coating which comprises organic and inorganic high-temperature-resistant resin, a sterilization deodorant, a first solvent, a second solvent, aluminum powder and a coating auxiliary agent, wherein the organic and inorganic high-temperature-resistant resin is SF605 resin, the first solvent is butyl acetate and ethyl acetate, and the second solvent is trimethylbenzene and butanone. The sterilization temperature-resistant coating provided by the invention uses organic and inorganic high-temperature-resistant resin, so that the temperature resistance limit can reach 450 ℃, and the sterilization temperature-resistant coating can still keep good glossiness and adhesive force even being in a 400 ℃ environment for a long time, and has deodorization and sterilization effects; trimethylbenzene is dried slowly, the dissolving capacity is poor, the butyl acetate dissolving capacity is strong, the trimethylbenzene is quick to dry, and the first solvent and the second solvent are matched for use, so that the organic and inorganic high-temperature-resistant resin is uniformly dissolved and uniformly distributed in the coating, and the construction spraying of the whole coating system is facilitated. The sterilization temperature-resistant coating can be widely applied to the inner walls of ovens, microwave ovens, disinfection cabinets, electric cookers and frying pans.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a sterilization temperature-resistant coating as well as a preparation method and a use method thereof.
Background
The prior temperature-resistant coating is mainly divided into the following four types: 1. pure silicon or polyester modified organic silicon system is adopted as the temperature-resistant coating, the temperature resistance limit is below 350 ℃, and the conditions of pulverization, paint fading, poor mechanical property and the like can occur when the coating is used at high temperature for a long time; 2. the ceramic system is used as a temperature-resistant coating, the temperature-resistant limit is below 350 ℃, the brittleness is high, the higher the temperature is, the higher the risk of cracking and paint falling is, the hardness is high, and the mechanical property is poor; 3. an engineering plastic system is adopted as a temperature-resistant coating, the temperature-resistant limit is below 400 ℃, the construction conditions are harsh, and the long-term heat loss is serious; 4. polytetrafluoroethylene is used as a temperature-resistant coating, which can resist 400 ℃ for a long time, but is forbidden in America and part of European Union countries. The four types of temperature-resistant coatings have advantages and disadvantages, but at present, deodorizing and sterilizing functional coatings which have the advantages of temperature resistance of 400-450 ℃, no toxicity, less heat loss, no cracking, hardness of more than 3H and good light and color retention are still lacking in the market.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a bactericidal temperature-resistant coating which can resist the temperature of 400-450 ℃, is durable in temperature resistance and has bactericidal property.
The invention is realized by the following technical scheme:
the bactericidal temperature-resistant coating comprises organic and inorganic high-temperature-resistant resin, a bactericidal deodorant, a first solvent, a second solvent, aluminum powder and a coating auxiliary agent, wherein the organic and inorganic high-temperature-resistant resin is SF605 resin, the first solvent is butyl acetate and ethyl acetate, and the second solvent is trimethylbenzene and butanone.
The sterilization temperature-resistant coating provided by the invention uses organic and inorganic high-temperature-resistant resin, so that the temperature resistance limit can reach 450 ℃, the sterilization temperature-resistant coating can not fade when being in a 400 ℃ environment for a long time, and good glossiness and adhesive force can be still kept; the trimethylbenzene is dried slowly, the dissolving capacity is poor, the butyl acetate dissolving capacity is strong, the trimethylbenzene is quick to dry, and the first solvent and the second solvent are matched for use, so that the organic and inorganic high-temperature-resistant resin is dissolved uniformly and distributed uniformly in the coating, and the construction spraying of the whole coating system is facilitated; the aluminum powder belongs to an effect pigment, the aluminum powder is used for increasing the surface effect of a coating, so that the bactericidal temperature-resistant coating has a glittering effect, and the aluminum powder is added to have a synergistic effect with other components, so that the temperature resistance durability of the whole coating is improved; the organic and inorganic high-temperature resistant resin is matched and cooperated with the sterilization deodorant and other paint auxiliaries, so that the sterilization temperature resistant paint has the effects of deodorization and sterilization and has excellent optical performance, mechanical performance and processability. The sterilization temperature-resistant coating can be widely applied to the inner walls of ovens, microwave ovens, disinfection cabinets, electric cookers and frying pans.
Further, the sterilizing deodorant is a zinc oxide and silver compound ceramic glaze sterilizing agent. The proper sterilization deodorant is selected, so that the proper sterilization effect is ensured, and the sterilization deodorant has good compatibility with other components.
Further, the sterilization temperature-resistant coating comprises 53-60% by weight of organic-inorganic high-temperature-resistant resin, 2-5% by weight of sterilization deodorant, 5-7% by weight of first solvent, 8-10% by weight of second solvent and 1.5-2% by weight of aluminum powder. The sterilization temperature-resistant coating has good chemical property and mechanical property by proper proportion.
Further, the sterilization temperature-resistant coating comprises 3.5-5% by weight of butyl acetate, 1.5-2% by weight of ethyl acetate, 4-5% by weight of trimethylbenzene and 4-5% by weight of butanone. The solvent with proper proportion is selected, and the slow-drying trimethylbenzene with poor dissolving capacity and the fast-drying butyl acetate with strong dissolving capacity are matched for use, so that the dissolving rate of the organic-inorganic high-temperature-resistant resin is adjusted, the organic-inorganic high-temperature-resistant resin is better blended with other components, and the organic-inorganic high-temperature-resistant resin has excellent construction spraying performance.
Further, the coating auxiliary agent comprises an anti-settling agent, talcum powder, a flatting agent and a defoaming agent. The anti-settling agent is used for regulating and controlling rheological property; the talcum powder is used for extinction; the leveling agent is used for reducing surface tension and promoting the sterilization temperature-resistant coating to form a flat and smooth coating after being dried; the defoaming agent is used for eliminating foams generated in the processing process of the sterilizing temperature-resistant coating and foams generated in the spraying and baking process of the coating.
Further, the bactericidal temperature-resistant coating comprises 1-1.5 wt% of anti-settling agent, 8-10 wt% of talcum powder, 0.2-0.5 wt% of flatting agent and 0.2-0.5 wt% of defoaming agent. The paint additive can better enhance the optical property, the mechanical property, the processing property and the like by proper proportion.
Further, the sterilization temperature-resistant paint also comprises a temperature-resistant pigment, wherein the temperature-resistant pigment comprises at least one of copper chromium black, manganese iron black and iron oxide red. The temperature-resistant pigment is used for hyperchromia, and the copper-chromium black has pure color, good blackness and heat resistance; the manganese iron black is a black pigment with a slightly red phase and has good temperature resistance; the iron oxide red as a pigment has good heat resistance and strong colorability.
Further, the bactericidal temperature-resistant coating comprises 6-7% of copper-chromium black, 1-2% of manganese-iron black and 0.2-0.3% of iron oxide red by weight. The color of the sterilizing temperature-resistant coating is prepared according to a proper proportion, and the sterilizing temperature-resistant coating has temperature resistance.
The invention also provides a preparation method of the bactericidal temperature-resistant coating, which comprises the following steps:
mixing aluminum powder, a first solvent and organic-inorganic high-temperature-resistant resin to obtain a first mixture; mixing organic and inorganic high-temperature-resistant resin, temperature-resistant pigment, a sterilization deodorant, part of coating auxiliary agent and a second solvent to obtain a second mixture; adding part of the coating auxiliary agent and the organic-inorganic high-temperature-resistant resin into the finished second mixture to obtain a third mixture; and mixing the first mixture and the third mixture to obtain the bactericidal temperature-resistant coating.
According to the preparation method of the sterilization temperature-resistant coating, the organic-inorganic high-temperature-resistant resin is mixed with the first solvent and the second solvent respectively, the organic-inorganic high-temperature-resistant resin in the first mixture has high solubility and is quick-drying when being dissolved in the first solvent, if the first solvent is used alone, the whole coating system is abnormally quick-drying, and the coating cannot obtain a good spreading effect during construction spraying; the solubility of the organic-inorganic high-temperature resistant resin in the second mixture is moderate and the organic-inorganic high-temperature resistant resin is dried slowly when the organic-inorganic high-temperature resistant resin is dissolved in the second solvent, and the second mixture also comprises other components such as a sterilization deodorant, a temperature-resistant pigment, a coating auxiliary agent and the like, so that the slow drying is favorable for the fusion of the organic-inorganic high-temperature resistant resin and the other components, the first mixture is added into the second mixture, namely the two solvents with different dissolution rates are mixed for use, the regulation and control of the dissolution rate of the organic-inorganic high-temperature resistant resin are favorable, and the organic-inorganic high-temperature resistant resin and the other components are uniformly mixed. The sterilization temperature-resistant coating is anticorrosive, and the sterilization temperature-resistant coating which is high-temperature resistant, uniformly distributed and has sterilization performance is prepared.
The invention also provides a using method of the sterilization temperature-resistant coating, wherein the sterilization temperature-resistant coating is sprayed on a workpiece to form a coating film, and the coating film is dried after leveling; wherein the thickness of the coating film is 15 to 23 μm.
The application method of the sterilization temperature-resistant coating can form a coating film with good temperature resistance, sterilization and mechanical properties on a workpiece, and if the thickness of the coating film is too thin, the heat preservation and color retention performances are poor, and if the thickness of the coating film is too thick, high-temperature cracking and other situations are easily caused.
Detailed Description
The invention provides a sterilization temperature-resistant coating, which comprises organic and inorganic high-temperature-resistant resin, a sterilization deodorant, a first solvent, a second solvent, aluminum powder and a coating auxiliary agent, wherein the organic and inorganic high-temperature-resistant resin is SF605 resin of Aupaly coating Co., Ltd, the first solvent is butyl acetate and ethyl acetate, and the second solvent is trimethylbenzene and butanone.
The sterilization temperature-resistant coating provided by the invention uses organic and inorganic high-temperature-resistant resin, so that the temperature resistance limit can reach 450 ℃, and the sterilization temperature-resistant coating can still keep good glossiness and adhesive force even being in a 400 ℃ environment for a long time, and has deodorization and sterilization effects; the trimethylbenzene is dried slowly, the dissolving capacity is poor, the butyl acetate dissolving capacity is strong, the trimethylbenzene is quick to dry, and the first solvent and the second solvent are matched for use, so that the organic and inorganic high-temperature-resistant resin is dissolved uniformly and distributed uniformly in the coating, and the construction spraying of the whole coating system is facilitated; the aluminum powder belongs to an effect pigment, the aluminum powder is used for increasing the surface effect of a coating, so that the bactericidal temperature-resistant coating has a glittering effect, and the aluminum powder is added to have a synergistic effect with other components, so that the temperature resistance durability of the whole coating is improved; the organic and inorganic high-temperature resistant resin is matched and cooperated with the sterilization deodorant and other paint auxiliaries, so that the sterilization temperature resistant paint has the effects of deodorization and sterilization and has excellent optical performance, mechanical performance and processability. The sterilization temperature-resistant coating can be widely applied to the inner walls of ovens, microwave ovens, disinfection cabinets, electric cookers and frying pans.
Preferably, the sterilizing and deodorizing agent is a zinc oxide and silver compound ceramic glaze sterilizing agent. The proper sterilization deodorant is selected, so that the proper sterilization effect is ensured, and the sterilization deodorant has good compatibility with other components.
Preferably, the sterilization temperature-resistant coating comprises 53-60% of organic-inorganic high-temperature-resistant resin, 2-2.5% of sterilization deodorant, 5-7% of first solvent, 8-10% of second solvent and 1.5-2% of aluminum powder by weight. The sterilization temperature-resistant coating has good chemical property and mechanical property by proper proportion.
More preferably, the sterilization temperature-resistant coating comprises 3.5-5% by weight of butyl acetate, 1.5-2% by weight of ethyl acetate, 4-5% by weight of trimethylbenzene and 4-5% by weight of butanone. The solvent with proper proportion is selected, and the slow-drying trimethylbenzene with poor dissolving capacity and the fast-drying butyl acetate with strong dissolving capacity are matched for use, so that the dissolving rate of the organic-inorganic high-temperature-resistant resin is adjusted, the organic-inorganic high-temperature-resistant resin is better blended with other components, and the organic-inorganic high-temperature-resistant resin has excellent construction spraying performance.
Preferably, the coating auxiliary agent comprises an anti-settling agent, talcum powder, a leveling agent and an antifoaming agent. The anti-settling agent is used for regulating and controlling rheological property; the talcum powder is used for extinction; the leveling agent is used for reducing surface tension and promoting the sterilization temperature-resistant coating to form a flat and smooth coating after being dried; the defoaming agent is used for eliminating foams generated in the processing process of the sterilizing temperature-resistant coating and foams generated in the spraying and baking process of the coating.
More preferably, the bactericidal temperature-resistant coating comprises 1-1.5 wt% of anti-settling agent, 8-10 wt% of talcum powder, 0.2-0.5 wt% of flatting agent and 0.2-0.5 wt% of defoaming agent. The paint additive can better enhance the optical property, the mechanical property, the processing property and the like by proper proportion.
Preferably, the sterilization temperature-resistant paint further comprises a temperature-resistant pigment, and the temperature-resistant pigment comprises at least one of copper chromium black, manganese iron black and iron oxide red. The temperature-resistant pigment is used for hyperchromia, and the copper-chromium black has pure color, good blackness and heat resistance; the manganese iron black is a black pigment with a slightly red phase and has good temperature resistance; the iron oxide red has good heat resistance and strong colorability.
Preferably, the bactericidal temperature-resistant coating comprises 6% -7% of copper-chromium black, 1% -2% of manganese-iron black and 0.2% -0.35% of iron oxide red. The color of the sterilizing temperature-resistant coating is prepared according to a proper proportion, and the sterilizing temperature-resistant coating has temperature resistance.
The invention also provides a preparation method of the sterilizing temperature-resistant coating, which comprises the following steps:
mixing aluminum powder, a first solvent and organic-inorganic high-temperature-resistant resin to obtain a first mixture;
mixing organic and inorganic high-temperature-resistant resin, temperature-resistant pigment, a sterilization deodorant, part of coating auxiliary agent and a second solvent to obtain a second mixture;
adding part of the coating auxiliary agent and the organic-inorganic high-temperature-resistant resin into the finished second mixture to obtain a third mixture;
and mixing the first mixture and the third mixture to obtain the sterilizing temperature-resistant coating.
According to the preparation method of the sterilization temperature-resistant coating, the organic-inorganic high-temperature-resistant resin is mixed with the first solvent and the second solvent respectively, the organic-inorganic high-temperature-resistant resin in the first mixture has high solubility and is quick-drying when being dissolved in the first solvent, the whole coating system is abnormally quick-drying, and the coating cannot obtain a good spreading effect during construction spraying; the solubility of the organic-inorganic high-temperature resistant resin in the second mixture is moderate and the organic-inorganic high-temperature resistant resin is dried slowly when the organic-inorganic high-temperature resistant resin is dissolved in the second solvent, and the second mixture also comprises other components such as a sterilization deodorant, a temperature-resistant pigment coating auxiliary agent and the like, so that the slow drying is beneficial to the fusion of the organic-inorganic high-temperature resistant resin and the other components, the first mixture is added into the second mixture, the regulation of the dissolution rate of the organic-inorganic high-temperature resistant resin is facilitated, and the organic-inorganic high-temperature resistant resin and the other components are uniformly mixed. The sterilization temperature-resistant coating is anticorrosive, and the sterilization temperature-resistant coating which is high-temperature resistant, uniformly distributed and has sterilization performance is prepared.
In a specific embodiment, aluminum powder is mixed with a first solvent and an organic-inorganic high temperature resistant resin to obtain a first mixture. After the aluminum powder is diluted, organic and inorganic high-temperature-resistant resin is added to play a role in flowing; and adding the organic-inorganic mixture into the second mixture, mixing with a sterilizing deodorant, a temperature-resistant pigment and a coating auxiliary agent, and grinding to reach the fineness requirement of 10 micrometers.
The invention also provides a using method of the sterilizing temperature-resistant coating, which comprises the following steps:
spraying the sterilization temperature-resistant coating on a workpiece to form a coating, leveling and drying; wherein the thickness of the coating film is 15 to 23 μm.
The application method of the sterilization temperature-resistant coating can form a coating film with good temperature resistance, sterilization and mechanical properties on a workpiece, and if the thickness of the coating film is too thin, the heat preservation and color retention performances are poor, and if the thickness of the coating film is too thick, high-temperature cracking and other situations are easily caused.
Example 1
This example 1 provides a bactericidal and temperature-resistant paint, which includes 53 wt% of organic-inorganic high-temperature-resistant resin, 2 wt% of bactericidal deodorant, 3.5 wt% of butyl acetate, 1.5 wt% of ethyl acetate, 4 wt% of trimethylbenzene, 4 wt% of butanone, 1 wt% of anti-settling agent, 6 wt% of copper-chromium black, 1 wt% of manganese-iron black, 8 wt% of talc powder, 0.2 wt% of leveling agent, 0.2 wt% of defoaming agent, 0.2 wt% of iron oxide red, and 1.5 wt% of aluminum powder.
Specifically, the anti-settling agent is at least one of bentonite and fumed silica; the leveling agent is an organic silicon or organic fluorine leveling agent, and specifically can be a BYK306 leveling agent or a BYK310 leveling agent; the defoaming agent is an organic silicon defoaming agent.
The sterilization temperature-resistant coating provided by the embodiment 1 has a temperature-resistant limit of 450 ℃, can be used at 400 ℃ for a long time, has excellent gloss retention and good adhesive force, has a continuous deodorization and sterilization effect, has boiling resistance and steam resistance, meets the national standards of RoHS and Chinese food safety and food health regulations approved by corresponding export countries such as FDA and LFGB, and provides a detection qualification report issued by a qualification-related organization.
The embodiment 1 provides a preparation method of a bactericidal temperature-resistant coating, which includes the following steps:
mixing and uniformly dispersing aluminum powder, 1.5% butyl acetate and ethyl acetate, adding 8% by weight of organic-inorganic high-temperature-resistant resin, and uniformly dispersing to obtain a first mixture;
adding 25 weight percent of organic-inorganic high-temperature-resistant resin into an operating cylinder, adding an anti-settling agent, copper-chromium black, manganese-iron black, a sterilizing deodorant, iron oxide red, trimethylbenzene and butanone while dispersing, uniformly dispersing, and grinding until the fineness is less than or equal to 10 mu m to obtain a second mixture;
adding 20% of organic-inorganic high-temperature-resistant resin into the second mixture, adding talcum powder, adding 2% of butyl acetate, cleaning the edge of the reaction container, dispersing for 15min until the fineness is less than or equal to 15 mu m, and then adding a leveling agent and a defoaming agent to obtain a third mixture;
the first mixture was added to the third mixture using a 180 mesh screen and dispersed at medium speed for 15 min.
The invention also provides a using method of the sterilizing temperature-resistant coating, which comprises the following steps:
the workpiece is pretreated, and dirt and dust on the surface are thoroughly removed;
spraying the sterilization temperature-resistant coating on a workpiece to form a coating film, leveling for 5-8min, and drying at 380-400 ℃ for 15 min. Wherein the coating film has a thickness of 15 to 23 μm, in a specific embodiment 18 to 23 μm. Since the coating film is a functional coating film, the heat-retaining color retention property is poor if the coating film is too thin, and the foaming is easy if the coating film is too thick, and the mechanical properties are relatively poor.
Example 2
This example 2 provides a bactericidal and temperature-resistant coating, which includes 60% by weight of organic-inorganic high-temperature-resistant resin, 2.5% by weight of bactericidal deodorant, 5% by weight of butyl acetate, 2% by weight of ethyl acetate, 5% by weight of trimethylbenzene, 5% by weight of butanone, 1.5% by weight of anti-settling agent, 7% by weight of copper-chromium black, 2% by weight of manganese-iron black, 10% by weight of talc, 0.5% by weight of leveling agent, 0.5% by weight of defoaming agent, 0.3% by weight of iron oxide red, and 2% by weight of aluminum powder. Specifically, the anti-settling agent is at least one of bentonite and fumed silica; the leveling agent is an organic silicon or organic fluorine leveling agent, and specifically can be a BYK306 leveling agent or a BYK310 leveling agent; the defoaming agent is an organic silicon defoaming agent.
The mechanical properties of the bactericidal temperature-resistant coating described in example 1-2 were measured, and the measurement results are shown in table 1-1:
TABLE 1-1 measurement results of mechanical properties of bactericidal temperature-resistant paint
The performance of the commercially available temperature-resistant coating is detected, and the detection results are shown in tables 1-2:
TABLE 1-2 mechanical performance test results for commercially available temperature resistant coatings
As can be seen from comparison of tables 1-1 and 1-2, examples 1 and 2 have good hardness, good heat resistance, a temperature resistance limit of 450 ℃, stable use at 400 ℃, good adhesion, and steam resistance. The sterilization temperature-resistant coating can be widely applied to the inner walls of ovens, microwave ovens, disinfection cabinets, electric cookers and woks, and is high-temperature-resistant and steam-resistant.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. The sterilization temperature-resistant coating is characterized in that:
the paint comprises organic and inorganic high-temperature-resistant resin, a sterilization deodorant, a first solvent, a second solvent, aluminum powder and a paint auxiliary agent, wherein the organic and inorganic high-temperature-resistant resin is SF605 resin of Opaili paint company Limited, the first solvent is butyl acetate and ethyl acetate, and the second solvent is trimethylbenzene and butanone.
2. The bactericidal temperature-resistant coating of claim 1, wherein:
the sterilizing deodorant is a zinc oxide and silver compound ceramic glaze bactericide.
3. The bactericidal temperature-resistant coating of claim 1, wherein:
the bactericidal temperature-resistant coating comprises 53-60% by weight of organic-inorganic high-temperature-resistant resin, 2-5% by weight of bactericidal deodorant, 5-7% by weight of first solvent, 8-10% by weight of second solvent and 1.5-2% by weight of aluminum powder.
4. The bactericidal temperature-resistant coating of claim 3, wherein:
the bactericidal temperature-resistant coating comprises 3.5-5% by weight of butyl acetate, 1.5-2% by weight of ethyl acetate, 4-5% by weight of trimethylbenzene and 4-5% by weight of butanone.
5. The bactericidal temperature-resistant coating of claim 1, wherein;
the coating auxiliary agent comprises an anti-settling agent, talcum powder, a flatting agent and a defoaming agent.
6. The bactericidal temperature-resistant coating of claim 5, wherein:
the bactericidal temperature-resistant coating comprises 1-1.5 wt% of anti-settling agent, 8-10 wt% of talcum powder, 0.2-0.5 wt% of flatting agent and 0.2-0.5 wt% of defoaming agent.
7. The bactericidal temperature-resistant coating of claim 1, wherein:
the paint also comprises a temperature-resistant pigment, wherein the pigment comprises at least one of copper chromium black, manganese iron black and iron oxide red.
8. The bactericidal temperature-resistant coating of claim 7, wherein:
the bactericidal temperature-resistant coating comprises 6-7% of copper-chromium black, 1-2% of manganese-iron black and 0.2-0.3% of iron oxide red by weight.
9. The preparation method of the bactericidal temperature-resistant coating according to any one of claims 1 to 8, which is characterized by comprising the following steps:
the method comprises the following steps:
mixing aluminum powder, a first solvent and organic-inorganic high-temperature-resistant resin to obtain a first mixture;
mixing organic and inorganic high-temperature-resistant resin, temperature-resistant pigment, a sterilization deodorant, part of coating auxiliary agent and a second solvent to obtain a second mixture;
adding part of the coating auxiliary agent and the organic-inorganic high-temperature-resistant resin into the finished second mixture to obtain a third mixture;
and mixing the first mixture and the third mixture to obtain the bactericidal temperature-resistant coating.
10. The use method of the bactericidal temperature-resistant coating according to any one of claims 1 to 8, characterized by comprising the following steps:
spraying the sterilization temperature-resistant coating on a workpiece to form a coating, leveling and drying; wherein the thickness of the coating film is 15 to 23 μm.
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