CN115353756A - Inorganic high-temperature-resistant non-stick ceramic coating and preparation method and application thereof - Google Patents

Inorganic high-temperature-resistant non-stick ceramic coating and preparation method and application thereof Download PDF

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CN115353756A
CN115353756A CN202211019564.0A CN202211019564A CN115353756A CN 115353756 A CN115353756 A CN 115353756A CN 202211019564 A CN202211019564 A CN 202211019564A CN 115353756 A CN115353756 A CN 115353756A
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temperature
ceramic coating
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钟志敏
韩勇敢
范明续
张其兵
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Guangdong Fuduo New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic

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  • Inorganic Chemistry (AREA)
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Abstract

The invention provides an inorganic high-temperature-resistant non-stick ceramic coating, a preparation method and application thereof, wherein the inorganic high-temperature-resistant non-stick ceramic coating comprises the following raw materials: low-melting-point glass powder, a curing agent, silicon nitride, titanium dioxide, aluminum oxide, titanium powder, silica sol, a wetting dispersant, a thickening agent and water. Also provides a preparation method of the inorganic high-temperature-resistant non-stick ceramic coating. The inorganic high-temperature-resistant non-stick ceramic coating provided by the invention has the advantages of good stability, good adhesive force, no shedding, no bubbling, no cracking, no chalking, corrosion resistance and good scratch resistance effect, and can meet the requirement of series products needing durable high temperature resistance at the temperature of 400-900 ℃. The inorganic high-temperature resistant non-stick ceramic coating belongs to environment protection; the inorganic high-temperature-resistant non-stick ceramic coating is applied to the coating material of non-stick cookware products, is not easy to fall off, has a non-stick self-cleaning effect, is easy to clean, is clean and sanitary, and completely meets the environmental protection standard of European Union RoHS.

Description

Inorganic high-temperature-resistant non-stick ceramic coating and preparation method and application thereof
Technical Field
The invention relates to the field of material chemistry, in particular to an inorganic high-temperature-resistant non-stick ceramic coating and a preparation method and application thereof.
Background
The non-stick pan is lifted, the first impression is Teflon, teflon coating is widely applied to kitchen ware, an electric cooker which is used every day, the non-stick pan and a pan are generally Teflon coating, the ceramic coating developed at present also occupies a proper place in the kitchen ware application, the ceramic coating has the characteristics of high hardness, environmental protection, food grade, high temperature resistance and the like, and other coatings cannot be achieved.
The ceramic paint is non-sticky in that a coating covered on the surface of the kitchen ware has the characteristics of low surface energy, small friction coefficient, easy sliding and the like, so the ceramic paint is not easy to adhere by other viscous substances or is easy to remove after adhesion, the common ceramic paint is divided into two layers, namely a primer and a finish paint, the non-sticky material is added into the finish paint, the coating has non-stickiness after curing and film forming, and if the high temperature resistance of the coating is purely required, the finish paint does not need to be sprayed, and the ceramic paint can be singly coated.
What is the difference between the coating formed by the ceramic coating and the traditional ceramic material?
The traditional ceramic materials, such as bowls, tanks, dishes and the like, have high hardness, good wear resistance, good temperature resistance and corrosion resistance. However, these ceramic materials do not have the ductile and flexible properties of metals, such as: it cannot be bent or pressed as in the case of metal. The advantages and disadvantages are determined by its chemical composition and structure.
The traditional ceramic material forms a three-dimensional network structure by aluminum oxide (Al-O) and silicon oxide (Si-O) bonds. The bond energy of aluminum oxide (Al-O) and silicon oxide (Si-O) is large, the structural unit takes aluminum and silicon as centers and takes oxygen atoms as bridges to form a tetrahedral rigid structure, and the structural deformation is small. Therefore, macroscopically, the ceramic product has the characteristics of hardness, temperature resistance and the like, is not easy to deform, has insufficient plasticity, and can not be normally used because the coating falls off once being dried. In addition, the chemical stability of Si-O bond and A1-O bond is excellent, so that the traditional ceramic material has excellent corrosion resistance.
In addition, people always wipe stains which are not easy to clean on the cookware with steel wire balls forcefully, so that the protective coating of the cookware is easy to damage, once the coating on the non-stick cookware is damaged, the coating gradually drops off due to rapid changes of cold and heat in the high-temperature use process, and the coating needs to be replaced, and a coating material with stable chemical properties, wear resistance, rapid changes of cold and heat resistance and the like is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the inorganic high-temperature-resistant non-stick ceramic coating which can meet the requirement of series products with high temperature durability at the temperature of 400-900 ℃, has a non-stick self-cleaning effect, is easy to clean and is sanitary.
The second purpose of the invention is to provide a preparation method of the inorganic high-temperature-resistant non-stick ceramic coating, which is simple and convenient to operate and suitable for large-scale production.
The invention also aims to provide the application of the inorganic high-temperature-resistant non-stick ceramic coating in the coating material of the non-stick cookware product, which is not easy to fall off, has a non-stick self-cleaning effect, is easy to clean and does not leave dirt.
In order to achieve one of the above purposes, the invention provides the following technical scheme:
the inorganic high-temperature-resistant non-stick ceramic coating comprises the following raw materials in parts by weight:
10-30 parts of low-melting-point glass powder, 5-8 parts of curing agent, 10-20 parts of silicon nitride, 3-8 parts of grade titanium dioxide, 10-15 parts of aluminum oxide, 3-5 parts of titanium powder, 15-25 parts of silica sol, 1-3 parts of wetting dispersant, 1-3 parts of thickening agent and 20-30 parts of water.
Further, the low-melting-point glass powder comprises the following raw materials in parts by weight: siO 2 2 30 to 40 portions of Li 2 10 to 15 portions of O, 10 to 15 portions of ZnO, 10 to 15 portions of BaO and K 2 10 to 15 portions of O and Na 2 10 to 15 portions of O and 5 to 10 portions of low-temperature cosolvent.
Wherein the SiO 2 Is nano silicon dioxide; the Li 2 O、ZnO、BaO、K 2 O、Na 2 O is a lead-free high-purity environment-friendly raw material; the low-temperature cosolvent is perlite micropowder.
Further, the preparation method of the low-melting-point glass powder comprises the following steps:
p1, weighing the raw material SiO with the formula amount 2 、Li 2 O、ZnO、BaO、K 2 O、Na 2 O and a low-temperature cosolvent, mixing and stirring uniformly, and synthesizing a vitreous body by a method of heating in a vacuum evaporation chamber to obtain microcrystalline powder which is fused, copolymerized and crystallized under a low-temperature environment to generate silicon oxide metal salt and has the remarkable characteristic of ultralow-temperature fusion;
and P2, washing, drying, coarse grinding, maintaining purity, fine grinding and precise grading to obtain the low-melting-point glass powder.
Further, the method for heating the vacuum evaporation chamber comprises the following steps: under the temperature of 450-500 ℃ and the vacuum degree of-0.09-0.1 MPa, the silicon oxide metal salt produced by melting copolymerization crystallization in the low-temperature environment is prepared in the heating of a vacuum evaporation chamber, and the microcrystalline powder has the obvious characteristic of ultralow-temperature melting.
Further, the wetting dispersant is KF-7651 polyacid chelating agent.
Further, the curing agent is lithium carbonate.
Further, the thickening agent is one or a composition of more than two of methylcellulose, sodium carboxymethylcellulose and carbon fibers.
Further, the silicon nitride is Si 3 N 4 the-C50 nano-scale silicon nitride has good chemical corrosion resistance, high hardness and small friction coefficient. Silicon nitride is an important structural ceramic material, has high hardness, self lubricating property and abrasion resistance, and is an atomic crystal; is resistant to oxidation at high temperature. It can resist cold and hot impact, and can be heated to above 1000 deg.C in air, and can be rapidly cooled and then rapidly heated, and can not be broken.
Furthermore, the titanium dioxide is nano titanium dioxide powder which is also called titanium dioxide and has the advantages of no toxicity, optimal opacity, optimal whiteness and brightness, and bright color, and the titanium dioxide is a white pigment used in paint; meanwhile, the titanium dioxide has strong adhesive force and is difficult to change chemically, the pigment, the curing agent and the base material are tightly combined and integrated, the mechanical strength and the adhesive force of the coating film can be enhanced, cracking or falling off can be prevented, the thickness of the coating film can be enhanced, ultraviolet rays or moisture can be prevented from penetrating, the ageing resistance and the durability of the coating film can be improved, and the service life of the coating film and a protected object can be prolonged.
Furthermore, the silica sol is an inorganic high-molecular coating, has good dissolution film-forming compactness, and is stable in water resistance and heat resistance.
Further, the alumina is nano alumina.
Further, the titanium powder is 200-mesh titanium powder.
In order to achieve the second purpose, the invention provides the following technical scheme:
the invention provides a preparation method of an inorganic high-temperature-resistant non-stick ceramic coating, which comprises the following steps:
s1, adding a wetting dispersant and low-melting-point glass powder in a formula amount into water in a formula amount, and stirring and fully mixing to obtain a mixture;
s2, adding silicon nitride, titanium dioxide, aluminum oxide, titanium powder and silica sol in formula amounts into the mixture obtained in the step S1, and then stirring and dispersing to obtain a dispersion system;
and S3, adding the thickening agent and the curing agent in the formula amount into the dispersion system in the step S2, and uniformly stirring to obtain a mixture, namely the inorganic high-temperature-resistant non-stick ceramic coating.
Further, in the step S1, the stirring speed is 1500-1600 r/min;
in step S2, the rotation speed of stirring is 1800-1900 r/min, and the dispersion time is 2-3 h.
In order to achieve the third purpose, the invention provides the following technical scheme:
the inorganic high-temperature-resistant non-stick ceramic coating has the advantages that the coating prepared from the inorganic high-temperature-resistant non-stick ceramic coating has good stability, self-cleaning effect, easy cleaning and no dirt retention; the inorganic high-temperature-resistant non-sticky ceramic coating has good adhesive force, does not fall off, does not bubble, does not crack, does not pulverize, is rust-resistant, has good anti-scratch effect, can meet the requirement of high-temperature series products with high temperature resistance and durability under the condition of 400-900 ℃, belongs to environment protection, and completely meets the environmental protection standard of RoHS of European Union.
The invention has the beneficial effects
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
(1) The inorganic high-temperature-resistant non-stick ceramic coating provided by the invention contains the good performance of low-melting-point glass powder, and the performances of hardness, glossiness and the like of alumina and titanium powder. In particular, silicon nitride has good chemical resistance, high hardness and small friction coefficient. Silicon nitride is an important structural ceramic material, has high hardness, self lubricating property and wear resistance, and is an atomic crystal; is resistant to oxidation at high temperature. It can resist cold and hot impact, and can be heated to above 1000 deg.C in air, and can be rapidly cooled and rapidly heated, and can not be broken. The titanium dioxide is also called titanium dioxide, so that the mechanical strength and the adhesive force of the coating film can be enhanced, cracking or falling off can be prevented, the thickness of the coating film can be enhanced, ultraviolet rays or moisture can be prevented from penetrating through the coating film, the ageing resistance and the durability of the coating film are improved, and the service life of the coating film and a protected object is prolonged; the added silica sol increases the compactness of the formed film of the coating, and the formed film is more durable. The inorganic high-temperature-resistant non-stick ceramic coating can meet the requirement of high-temperature-resistant durable high-temperature series products under the condition of 400-900 ℃, has a non-stick self-cleaning effect, and is easy to clean, clean and sanitary.
(2) The inorganic high-temperature-resistant non-stick ceramic coating provided by the invention is prepared by heating the low-melting-point glass powder in a vacuum evaporation chamber, the melting temperature of raw materials is reduced under a vacuum condition, the heat energy consumption is greatly reduced, and the low-melting-point glass powder is low in use temperature, stable in chemical performance, non-toxic, tasteless and pollution-free.
(3) The preparation method of the inorganic high-temperature-resistant non-stick ceramic coating provided by the invention is simple and convenient to operate and is suitable for large-scale production. The inorganic high-temperature-resistant non-stick ceramic coating prepared by the preparation method inherits the high hardness, temperature resistance and corrosion resistance of the traditional ceramic coating, improves the machinability and curing conditions, saves energy, can be sintered at a relatively low temperature (400-450 ℃), and is sintered at a temperature of over 600 ℃ in the traditional ceramic product.
(4) The invention provides an application of an inorganic high-temperature-resistant non-stick ceramic coating in a coating material of a non-stick cookware product, which has a non-stick self-cleaning effect, is easy to clean and does not leave dirt. The prepared coating material has good stability, good adhesive force, no shedding, no bubbling, no cracking, no pulverization, corrosion resistance, good anti-scratch effect, environmental protection, no toxicity and energy conservation, and can meet the requirement of high temperature resistant and durable high temperature series products under the condition of 400-900 ℃. The inorganic high-temperature resistant non-stick ceramic coating belongs to environment protection and completely meets the environmental protection standard of European Union RoHS.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below. In the following examples, those whose operations are not subject to the conditions indicated, are carried out according to the conventional conditions or conditions recommended by the manufacturer.
Example 1
A. Preparation of low-melting-point glass powder
The low-melting-point glass powder comprises the following raw materials in parts by weight: nano SiO 2 30 parts of Li 2 10 portions of O, 10 portions of ZnO, 10 portions of BaO and K 2 O10 parts, na 2 10 parts of O and 5 parts of perlite micropowder.
The preparation method of the low-melting-point glass powder comprises the following steps:
p1, weighing raw material SiO in formula amount 2 、Li 2 O、ZnO、BaO、K 2 O、Na 2 Mixing and stirring the O and perlite micro powder uniformly, and synthesizing a vitreous body by a method of heating in a vacuum evaporation chamber at the temperature of 450 ℃ and the vacuum degree of-0.099 MPa to obtain fused copolymerization crystallization under a low-temperature environment to generate silicon oxide metal salt which has the remarkable characteristic of ultralow-temperature fusion;
and P2, washing, drying, coarse grinding, maintaining purity, fine grinding and precise grading to obtain the low-melting-point glass powder.
B. Preparation of inorganic high-temperature-resistant non-stick ceramic coating
The inorganic high-temperature-resistant non-stick ceramic coating comprises the following raw materials in parts by weight: 10 parts of low-melting-point glass powder, 5 parts of curing agent, 10 parts of silicon nitride, 3 parts of nano titanium dioxide powder, 10 parts of nano aluminum oxide, 3 parts of 200-mesh titanium powder, 15 parts of silica sol, 1 part of wetting dispersant, 1 part of thickening agent and 20 parts of deionized water.
Wherein the wetting dispersant is KF-7651 polyacid chelating agent; the curing agent is lithium carbonate; the thickening agent is methyl cellulose.
The preparation method of the inorganic high-temperature-resistant non-stick ceramic coating comprises the following steps:
s1, adding a wetting dispersant and low-melting-point glass powder into deionized water according to the formula amount, and stirring and fully mixing at the rotating speed of 1550r/min to obtain a mixture;
s2, adding silicon nitride, nano-scale titanium dioxide powder, nano-alumina, 200-mesh titanium powder and silica sol into the mixture obtained in the step S1, and stirring and dispersing for 2.5 hours at a rotating speed of 1850r/min to obtain a dispersion system;
and S3, adding the thickening agent and the curing agent in the formula amount into the dispersion system in the step S2, and uniformly stirring to obtain a mixture, namely the inorganic high-temperature-resistant non-stick ceramic coating.
Example 2
A. Preparation of low-melting-point glass powder
The low-melting-point glass powder comprises the following raw materials in parts by weight: nano SiO 2 35 parts of Li 2 O12 parts, znO 12 parts, baO 12 parts and K 2 O12 parts, na 2 12 parts of O and 8 parts of perlite micro powder.
The preparation method of the low-melting-point glass powder comprises the following steps:
p1, weighing the raw material SiO with the formula amount 2 、Li 2 O、ZnO、BaO、K 2 O、Na 2 Mixing and stirring the fine powder of O and perlite uniformlySynthesizing a vitreous body by a heating method in a vacuum evaporation chamber at 470 ℃ and a vacuum degree of-0.096 MPa to obtain a silicon oxide metal salt which is produced by melting, copolymerization and crystallization in a low-temperature environment and has the remarkable characteristic of ultralow-temperature melting;
and P2, washing, drying, coarse grinding, maintaining purity, fine grinding and precise grading to obtain the low-melting-point glass powder.
B. Preparing inorganic high-temperature-resistant non-stick ceramic paint:
the inorganic high-temperature-resistant non-stick ceramic material comprises the following raw materials in parts by weight: 20 parts of low-melting-point glass powder, 6 parts of curing agent, 15 parts of silicon nitride, 5 parts of nano titanium dioxide powder, 12 parts of nano aluminum oxide, 4 parts of 200-mesh titanium powder, 20 parts of silica sol, 2 parts of wetting dispersant, 2 parts of thickening agent and 25 parts of deionized water.
Wherein the wetting dispersant is KF-7651 polyacid chelating agent; the curing agent is lithium carbonate; the thickening agent is sodium carboxymethyl cellulose.
The preparation method of the inorganic high-temperature-resistant non-stick ceramic coating comprises the following steps:
s1, adding a wetting dispersant and low-melting-point glass powder in a formula amount into deionized water in a formula amount, and stirring and fully mixing at a rotating speed of 1600r/min to obtain a mixture;
s2, adding silicon nitride, nano titanium dioxide powder, nano alumina, 200-mesh titanium powder and silica sol into the mixture obtained in the step S1, and stirring and dispersing at the rotating speed of 1800r/min for 3 hours to obtain a dispersion system;
and S3, adding a thickener and a curing agent in a formula amount into the dispersion system in the step S2, and uniformly stirring to obtain a mixture, namely the inorganic high-temperature-resistant non-stick ceramic coating.
Example 3
A. Preparation of low-melting-point glass powder
The low-melting-point glass powder comprises the following raw materials in parts by weight: nano SiO 2 40 parts of Li 2 15 portions of O, 15 portions of ZnO, 15 portions of BaO and K 2 15 portions of O and Na 2 15 parts of O and 10 parts of perlite micropowder.
The preparation method of the low-melting-point glass powder comprises the following steps:
p1, weighing raw material SiO in formula amount 2 、Li 2 O、ZnO、BaO、K 2 O、Na 2 Mixing and stirring the O and perlite micro powder uniformly, synthesizing a vitreous body by a method of heating in a vacuum evaporation chamber at the temperature of 500 ℃ and the vacuum degree of-0.095 MPa to obtain silicon oxide metal salt generated by fusion, copolymerization and crystallization in a low-temperature environment, wherein the micro powder has the remarkable characteristic of ultralow-temperature fusion;
and P2, washing, drying, coarse grinding, maintaining purity, fine grinding and precise grading to obtain the low-melting-point glass powder.
B. Preparation of inorganic high-temperature-resistant non-stick ceramic coating
The inorganic high-temperature-resistant non-stick ceramic material comprises the following raw materials in parts by weight: 30 parts of low-melting-point glass powder, 8 parts of curing agent, 20 parts of silicon nitride, 8 parts of nano titanium dioxide powder, 15 parts of nano aluminum oxide, 5 parts of 200-mesh titanium powder, 25 parts of silica sol, 3 parts of wetting dispersant, 3 parts of thickening agent and 30 parts of deionized water.
Wherein the wetting dispersant is KF-7651 polyacid chelating agent; the curing agent is lithium carbonate; the thickening agent is a composition of 1 part of methyl cellulose, 1 part of sodium carboxymethyl cellulose and 1 part of carbon fiber.
The preparation method of the inorganic high-temperature-resistant non-stick ceramic coating comprises the following steps:
s1, adding a wetting dispersant and low-melting-point glass powder into deionized water according to the formula amount, and stirring and fully mixing at a rotating speed of 1500r/min to obtain a mixture;
s2, adding silicon nitride, nano-scale titanium dioxide powder, nano-alumina, 200-mesh titanium powder and silica sol into the mixture obtained in the step S1, and stirring and dispersing for 2 hours at a rotating speed of 1900r/min to obtain a dispersion system;
and S3, adding a thickener and a curing agent in a formula amount into the dispersion system in the step S2, and uniformly stirring to obtain a mixture, namely the inorganic high-temperature-resistant non-stick ceramic coating.
Comparative example 1
A. Preparation of low-melting-point glass powder
The low-melting-point glass powder comprises the following raw materials in parts by weight: nano SiO 2 40 parts of Li 2 15 portions of O, 15 portions of ZnO, 15 portions of BaO and K 2 O15 parts, na 2 15 parts of O and 10 parts of perlite micropowder.
The preparation method of the low-melting-point glass powder comprises the following steps:
p1, weighing raw material SiO in formula amount 2 、Li 2 O、ZnO、BaO、K 2 O、Na 2 Mixing and stirring the O and perlite micro powder uniformly, synthesizing a vitreous body by a method of heating in a vacuum evaporation chamber at the temperature of 500 ℃ and the vacuum degree of-0.095 MPa to obtain silicon oxide metal salt generated by fusion, copolymerization and crystallization in a low-temperature environment, wherein the micro powder has the remarkable characteristic of ultralow-temperature fusion;
and P2, washing, drying, coarse grinding, maintaining purity, fine grinding and precise grading to obtain the low-melting-point glass powder.
B. Preparation of inorganic high-temperature-resistant non-stick ceramic coating
The inorganic high-temperature-resistant non-stick ceramic material comprises the following raw materials in parts by weight: 30 parts of low-melting-point glass powder, 8 parts of curing agent, 15 parts of nano-alumina, 5 parts of 200-mesh titanium powder, 3 parts of wetting dispersant, 3 parts of thickening agent and 30 parts of deionized water.
Wherein the wetting dispersant is KF-7651 polyacid chelating agent; the curing agent is lithium carbonate; the thickening agent is a composition of 1 part of methyl cellulose, 1 part of sodium carboxymethyl cellulose and 1 part of carbon fiber.
The preparation method of the inorganic high-temperature-resistant non-stick ceramic coating comprises the following steps:
s1, adding a wetting dispersant and low-melting-point glass powder in a formula amount into deionized water in a formula amount, and stirring and fully mixing at a rotating speed of 1600r/min to obtain a mixture;
s2, adding titanium dioxide, nano-alumina and 200-mesh titanium powder in a formula amount into the mixture obtained in the step S1, and stirring and dispersing for 2.5 hours at a rotating speed of 1850r/min to obtain a dispersion system;
and S3, adding the thickening agent and the curing agent in the formula amount into the dispersion system in the step S2, and uniformly stirring to obtain a mixture, namely the inorganic high-temperature-resistant non-stick ceramic coating.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Performance testing
The sample adopts iron-based pots purchased from the common market, and the inorganic high-temperature-resistant non-stick ceramic paint prepared in the examples 1, 2 and 3 and the comparative example 1 is sprayed on the surface of the pot of the sample to prepare a coating.
The coatings of the inorganic low-temperature ceramic paints prepared in the above examples 1, 2, 3 and comparative example 1 were subjected to performance comparison test experiments, and in addition, detailed test data results are shown in table 1 for teflon coatings:
table 1 table of performance test data results
Figure BDA0003813564550000111
As can be seen from the performance test results in Table 1, the inorganic high temperature resistant non-stick ceramic coating prepared by the methods of the embodiments 1, 2 and 3 of the invention has good high temperature resistance and is inorganic, and can endure the high temperature of 450 ℃ for a long time without releasing toxic gas. When the pots with the coatings of the embodiments 1, 2 and 3 and the comparative example 1 and the commercially available common pots are used under the same condition to clean stains, the pots with the coatings of the embodiments of the invention can be cleaned by soaking for a proper time and lightly wiping with sponge or rag, and can not fall off and deform even if being subjected to a large heat and cold sudden change in the using process. And comparative example 1 is only easier to clean than general commercial pots, and also has adhesion, and the high temperature resistance and hardness are reduced. Only the low melting point glass powder is used, which has certain hardness and high temperature resistance, but the whole performance is not as good as that of the coating prepared by the examples 1, 2 and 3.
The inorganic high-temperature-resistant non-stick ceramic coating provided by the invention can be continuously used at the temperature of 450 ℃ without being burnt, deformed and discolored; the surface hardness is large: scratch is not easy to generate by using a metal cooker, and the hardness of the pencil can reach 8-9H at normal temperature according to the international pencil hardness test; the pencil hardness can reach 5-6H at 400-500 ℃; environmental protection, nontoxic food grade: a test mechanism carries out dissolution test on 6 toxic substances, namely As (arsenic), cd (cadmium), cr (chromium), pb (lead), CU (flame retardant) and Hg (mercury), the test result shows that any one of the substances is not detected, and a toxic substance and a heavy metal are not detected according to a method for carrying out safety test on the chemical components of 64 components of the ceramic coating by the American FDA certification method.
Meanwhile, the inorganic high-temperature-resistant ceramic non-stick coating has an energy-saving effect in the use process, the sintering temperature of the inorganic high-temperature-resistant ceramic non-stick coating is only 300-400 ℃, and the traditional Teflon coating needs to be more than 400 ℃, so that the consumption of energy, the production cost and the cost input of processing equipment are greatly reduced compared with the polyfluorinated coating.

Claims (10)

1. The inorganic high-temperature-resistant non-stick ceramic coating is characterized by comprising the following raw materials in parts by weight: 10 to 30 parts of low-melting-point glass powder, 5 to 8 parts of curing agent, 10 to 20 parts of silicon nitride, 3 to 8 parts of titanium dioxide, 10 to 15 parts of aluminum oxide, 3 to 5 parts of titanium powder, 15 to 25 parts of silica sol, 1 to 3 parts of wetting dispersant, 1 to 3 parts of thickening agent and 20 to 30 parts of water.
2. The inorganic high-temperature-resistant non-stick ceramic coating according to claim 1, wherein the low-melting-point glass powder comprises the following raw materials in parts by weight: siO 2 2 30 to 40 portions of Li 2 10 to 15 portions of O, 10 to 15 portions of ZnO, 10 to 15 portions of BaO and K 2 10 to 15 portions of O and Na 2 10 to 15 portions of O and 5 to 10 portions of low-temperature cosolvent.
3. The inorganic high temperature resistant non-stick ceramic coating of claim 2, wherein the SiO is 2 Is nano silicon dioxide; the Li 2 O、ZnO、BaO、K 2 O、Na 2 O is a lead-free high-purity environment-friendly raw material; the low-temperature cosolvent is perlite micropowder.
4. The inorganic high-temperature-resistant non-stick ceramic coating according to claim 1, wherein the preparation method of the low-melting-point glass powder comprises the following steps:
p1, weighing raw material SiO in formula amount 2 、Li 2 O、ZnO、BaO、K 2 O、Na 2 O and a low-temperature cosolvent are uniformly mixed, and a vitreous body is synthesized by a method of heating in a vacuum evaporation chamber to obtain a silicon oxide metal salt generated by melting, copolymerization and crystallization in a low-temperature environment;
and P2, washing, drying, coarse grinding, maintaining purity, fine grinding and precise grading to obtain the low-melting-point glass powder.
5. The inorganic high-temperature-resistant non-stick ceramic coating according to claim 1, wherein the wetting dispersant is KF-7651 polyacid chelating agent.
6. The inorganic high temperature resistant non-stick ceramic coating of claim 1, wherein the curing agent is lithium carbonate.
7. The inorganic high-temperature-resistant non-stick ceramic coating according to claim 1, wherein the thickener is one or a combination of more than two of methylcellulose, sodium carboxymethylcellulose and carbon fibers.
8. The method for preparing the inorganic high-temperature-resistant non-stick ceramic coating according to any one of claims 1 to 7, comprising the steps of:
s1, adding a wetting dispersant and low-melting-point glass powder into water according to the formula amount, stirring and mixing to obtain a mixture;
s2, adding silicon nitride, titanium dioxide, aluminum oxide, titanium powder and silica sol in formula amounts into the mixture obtained in the step S1, and then stirring and dispersing to obtain a dispersion system;
and S3, adding a thickener and a curing agent in a formula amount into the dispersion system in the step S2, and uniformly stirring to obtain a mixture, namely the inorganic high-temperature-resistant non-stick ceramic coating.
9. The method for preparing the inorganic high-temperature-resistant non-stick ceramic coating according to claim 8, wherein in the step S1, the rotation speed of stirring is 1500-1600 r/min; in the step S2, the stirring speed is 1800-1900 r/min, and the dispersing time is 2-3 h.
10. The use of the inorganic high temperature resistant non-stick ceramic coating of any one of claims 1-7 as a coating material for non-stick cookware articles.
CN202211019564.0A 2022-08-24 2022-08-24 Inorganic high-temperature-resistant non-stick ceramic coating and preparation method and application thereof Pending CN115353756A (en)

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