CN115449239A - Inorganic low-temperature microcrystalline ceramic coating and preparation method and application thereof - Google Patents

Inorganic low-temperature microcrystalline ceramic coating and preparation method and application thereof Download PDF

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CN115449239A
CN115449239A CN202211056255.0A CN202211056255A CN115449239A CN 115449239 A CN115449239 A CN 115449239A CN 202211056255 A CN202211056255 A CN 202211056255A CN 115449239 A CN115449239 A CN 115449239A
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韩勇敢
钟志敏
梁倩婷
李伟勤
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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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
    • A47J36/025—Vessels with non-stick features, e.g. coatings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/078—Glass compositions containing silica with 40% to 90% silica, by weight containing an oxide of a divalent metal, e.g. an oxide of zinc
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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
    • C09D5/08—Anti-corrosive 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
    • C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
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    • C09D7/61—Additives non-macromolecular inorganic
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    • 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
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract

The invention discloses an inorganic low-temperature microcrystalline ceramic coating, a preparation method and an application thereof, wherein the coating comprises the following raw materials: the coating comprises low-melting-point glass powder, a curing agent, nano-scale titanium dioxide, titanium nitride powder, nano-alumina, nano-silica, nano-titania, nano-zirconia, graphene, a wetting dispersant, a thickening agent and water. The components are combined to enable the coating to have the performance of an enamel material without the fragility of the enamel material, the formed coating is good in toughness, can resist the temperature of more than 600 ℃, has good antibacterial property, low expansibility, acid and alkali corrosion resistance, high insulativity, wear resistance and high hardness, has a far infrared ray function, and belongs to food-grade coatings which are nontoxic, tasteless and pollution-free. The coating can be used for preparing an aluminum-based pot coating, has better adhesiveness and better safety, can not release harmful substances even when heated at high temperature, and can be used as a new replacement of a Teflon coating, thereby better protecting a pot and prolonging the service life of the pot.

Description

Inorganic low-temperature microcrystalline ceramic coating and preparation method and application thereof
Technical Field
The invention relates to a ceramic coating technology, in particular to an inorganic low-temperature microcrystalline ceramic coating and a preparation method and application thereof.
Background
With the improvement of living standard of people and the diversification of market consumption demands and the enhancement of health care consciousness, the electric cooker made of aluminum-based materials is always accepted by consumers as a market consumer product, but the inner container of the electric cooker made of the aluminum-based materials is mostly coated with Teflon.
The main stream of the market adopts Teflon coating, belongs to organic industrial coating, and has excellent characteristics which cannot be matched with other industrial coatings. It can also be used to directly solve the problems on your electric rice cooker products to improve product quality and increase sales.
The Teflon coating is a nose progenitor of non-stick coating, combines heat resistance, chemical inertness, excellent insulation stability and low friction, and has comprehensive advantages which cannot be counterbalanced by other coatings. Teflon product properties include non-stick, heat resistance, slip, moisture resistance, abrasion resistance, and corrosion resistance. The Teflon industrial coating has powder and liquid states. The flexibility of product application allows it to be used on products of almost all shapes and sizes, and the teflon coating gives the product an added value far exceeding the value of the non-stick coating itself.
The Teflon coating is nontoxic when being used under normal conditions, is mainly made of fluoropolymer, contains polytetrafluoroethylene, has the decomposition temperature of 350 ℃, is 200-250 ℃ even if being heated to the smoking temperature by oil during daily cooking, can not release toxic substances, and can avoid the condition of 'dry heating a pot', the coating which is too high in temperature can be decomposed when the dry heating pot is used, the smoke which is not adhered to the pot coating and burnt can possibly cause symptoms of headache, heating and the like.
When the coating of the electric cooker begins to fall off, the electric cooker is recommended not to be used, firstly, the electric cooker can be stuck, and secondly, more coatings are prevented from being eaten. When the material is used for a long time, substances such as aluminum ion precipitation and the like are inevitably brought, and adverse effects on health are generated.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide an inorganic low-temperature microcrystalline ceramic coating which has the properties of an enamel material, does not have the fragility of the enamel material, has good coating toughness, is antibacterial, can resist the temperature of more than 600 ℃, has low expansion, is resistant to acid and alkali corrosion, has high insulation and far infrared functions, high hardness and wear resistance, and is non-toxic, tasteless, pollution-free and high in safety performance; the second purpose of the invention is to provide a preparation method of the inorganic low-temperature microcrystalline ceramic coating, which has simple steps and mild reaction conditions and is suitable for large-scale production; the invention also aims to provide the application of the inorganic low-temperature microcrystalline ceramic coating, which can be used as an inner coating of an aluminum-based pot, improves the toughness, temperature resistance and corrosion resistance of the coating, has high safety performance, and does not contain or release harmful substances.
One of the purposes of the invention is realized by adopting the following technical scheme:
an inorganic low-temperature microcrystalline ceramic coating comprises the following raw materials in parts by weight: 30-40 parts of low-melting-point glass powder, 10-15 parts of curing agent, 8-10 parts of nano-scale titanium dioxide, 6-8 parts of titanium nitride powder, 10-15 parts of nano-alumina, 10-15 parts of nano-silica, 10-15 parts of nano-titania, 10-15 parts of nano-zirconia, 3-5 parts of graphene, 1-3 parts of wetting dispersant, 1-3 parts of thickener and 20-30 parts of water.
Further, the low-melting-point glass powder is prepared by melting raw materials of silicon dioxide, lithium oxide, zinc oxide, barium oxide, potassium oxide and sodium oxide into a glass body through a high-temperature evaporation and condensation process, and then sequentially carrying out the steps of washing, drying, coarse grinding, fine grinding and grading.
Specifically, the conditions of the high-temperature evaporation and condensation process are as follows: the temperature is 400-450 ℃, the pressure is 40-50 MPa, and the time is 12-24 h.
Still further, the low-melting-point glass powder comprises the following raw materials in parts by weight: 40 to 50 parts of silicon dioxide, 10 to 20 parts of lithium oxide, 10 to 20 parts of zinc oxide, 10 to 20 parts of barium oxide, 10 to 20 parts of potassium oxide and 10 to 20 parts of sodium oxide.
Furthermore, the wetting dispersant is a sodium polyacrylate dispersant, which belongs to a hydrophobically modified polymer dispersant, and the sodium polyacrylate dispersant has the characteristics of reducing the viscosity of the grinding material, improving the storage stability of the coating, increasing the gloss and leveling property, and the like. The amount is low because the dispersibility of the sodium polyacrylate dispersant is higher than that of the general water-resistant dispersant. Can also effectively improve the water resistance of the coating, and is particularly suitable for adding the ceramic coating material on the surface of the high-gloss aluminum-based electric cooker product.
Furthermore, the curing agent is water-based silicone-acrylic emulsion with a silica structure (-Si-O-), has excellent weather resistance and heat resistance, has the high temperature resistance, ultraviolet resistance, oxidation degradation resistance, low surface energy and good air permeability of organic silicon resin, has the flexibility, gloss retention, color retention and high adhesiveness of acrylate resin, and is a coating auxiliary agent with excellent comprehensive performance.
Further, the thickening agent is a silane coupling agent, and the molecular structural formula of the silane coupling agent is Y-R-Si (OR) 3 (ii) a Wherein Y is an organofunctional group and SiOR is a siloxy group. The silicon alkoxide group is reactive with inorganic substances, and the organic functional group is reactive with or compatible with organic substances. Thus, when a silane coupling agent is interposed between the inorganic and organic interfaces, a bonding layer of organic matrix-silane coupling agent-inorganic matrix may be formed. Preferred silane coupling agents are A151 (vinyltriethoxysilane), A171 (vinyltrimethoxysilane) and A172 (vinyltris (. Beta. -methoxyethoxy) silane), which act as adhesion promoters on the principle that they have two groups per se;and the other group can be combined with a high polymer material or an adhesive, so that a chemical bond with higher strength is formed on an adhesive interface, and the adhesive strength is greatly improved. The main application of the silane coupling agent is as a surface treatment agent of a framework material.
The second purpose of the invention is realized by adopting the following technical scheme:
the preparation method of the inorganic low-temperature microcrystalline ceramic coating comprises the following steps:
1) Adding the wetting dispersant and the low-melting-point glass powder into water according to the formula amount, and stirring until the wetting dispersant and the low-melting-point glass powder are fully mixed to obtain a mixture;
2) Adding nanoscale titanium dioxide, titanium nitride powder, nano aluminum oxide, nano silicon oxide, nano titanium oxide, nano zirconium oxide and graphene into the mixture obtained in the step 1), and stirring and dispersing to obtain a dispersion liquid;
3) Adding a thickening agent and a curing agent into the dispersion liquid obtained in the step 2), and uniformly stirring to obtain the inorganic low-temperature microcrystalline ceramic coating.
Further, in the step 1), the stirring speed is 1500-1800 r/min; in the step 2), the stirring speed is 1700 to 2000r/min.
The third purpose of the invention is realized by adopting the following technical scheme:
the application of the inorganic low-temperature microcrystalline ceramic coating is used for preparing an aluminum-based pot coating, preferably an aluminum-based electric cooker liner coating.
Compared with the prior art, the invention has the beneficial effects that:
(1) The inorganic low-temperature microcrystalline ceramic coating comprises the following raw materials: the coating comprises low-melting-point glass powder, a curing agent, nano titanium dioxide, titanium nitride powder, nano aluminum oxide, nano silicon oxide, nano titanium oxide, nano zirconium oxide, graphene, a wetting dispersant, a thickening agent and water. The composition of the components enables the coating to have the performance of an enamel material without the fragility of the enamel material, the formed coating is good in toughness, can resist the temperature of over 600 ℃, has good antibacterial property, low expansibility, acid and alkali corrosion resistance, high insulativity, wear resistance and high hardness, has a far infrared function, and belongs to a non-toxic, tasteless and pollution-free food-grade coating.
(2) The low-melting-point glass powder in the inorganic low-temperature microcrystal ceramic coating adopts silicon dioxide (SiO) 2 ) Lithium oxide (Li) 2 O), zinc oxide (ZnO), barium oxide (BaO), potassium oxide (K) 2 O) and sodium oxide (Na) 2 O) component, melting by a high-temperature evaporation and condensation process, melting, copolymerizing and crystallizing at a low temperature to generate silicon oxide metal salt, and then sequentially performing the procedures of washing, drying, coarse grinding, purity maintaining, accurate grinding and precise grading to prepare the microcrystalline powder with the remarkable characteristic of ultralow-temperature melting, high viscosity and capability of enabling the coating to be better attached to the surface of the base material.
(3) The wetting dispersant in the coating is a sodium polyacrylate dispersant, has the characteristics of reducing the viscosity of a grinding material, improving the storage stability of the coating, increasing the gloss and leveling property and the like, can effectively improve the water resistance of the coating, and is particularly suitable for adding a ceramic coating material on the surface of a high-gloss aluminum-based electric cooker product; the graphene is made of far infrared functional materials, so that the uniform heating rate of the coating material due to thermal radiation is realized, and the energy consumption is reduced. The curing agent adopts the water-based silicone-acrylic emulsion with a silicon-oxygen (-Si-O-) structure, has the advantages of high temperature resistance, ultraviolet resistance, oxidation degradation resistance, low surface energy, good air permeability of the organic silicon resin, flexibility, light retention, color retention, high adhesiveness and excellent comprehensive performance of the acrylate resin. The thickening agent is a silane coupling agent, and the molecular structural formula of the silane coupling agent is Y-R-Si (OR) 3 (wherein Y is an organic functional group and SiOR is a siloxy group) and functions on the principle that it itself has two groups; a group can be bonded to the bonded backbone material; and the other group can be combined with a high polymer material or an adhesive, so that a chemical bond with higher strength is formed on a bonding interface, and the bonding strength is greatly improved. The silane coupling agent is used as a surface treatment thickening agent of a framework material.
(4) The preparation method of the coating comprises the following steps: firstly, adding the wetting dispersant and the low-melting-point glass powder in the formula ratio into water, and stirring until the wetting dispersant and the low-melting-point glass powder are fully mixed to obtain a mixture; adding nano titanium dioxide, titanium nitride powder, nano aluminum oxide, nano silicon oxide, nano titanium oxide, nano zirconium oxide and graphene, and stirring and dispersing to obtain a dispersion liquid; and finally, adding a thickening agent and a curing agent, and uniformly stirring to obtain the inorganic low-temperature microcrystalline ceramic coating. The preparation method has simple steps and mild reaction conditions, does not need high-temperature treatment, and is suitable for large-scale industrial production.
(5) The inorganic low-temperature microcrystalline ceramic coating provided by the invention utilizes the physical characteristics that low-melting-point glass powder is melted by high temperature heating but has high viscosity, can effectively form a high-toughness protective layer on the surface of an aluminum-based cooker, and can improve the acid and alkali resistance, weather resistance, wear resistance and corrosion resistance of the inner container of the aluminum-based electric cooker. The coating prepared by the paint has better adhesiveness and better safety, does not release harmful substances even when heated at high temperature, and can be used as a new replacement of a Teflon coating, thereby better protecting cookware and prolonging the service life of the cookware.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, various embodiments or technical features described below may be arbitrarily combined to form a new embodiment.
Example 1
An inorganic low-temperature microcrystalline ceramic coating comprises the following raw materials in parts by weight: 30 parts of low-melting-point glass powder, 10 parts of curing agent, 8 parts of nano-scale titanium dioxide, 6 parts of titanium nitride powder, 10 parts of nano-alumina, 10 parts of nano-silica, 10 parts of nano-titania, 10 parts of nano-zirconia, 3 parts of graphene, 1 part of wetting dispersant, 1 part of thickener and 20 parts of deionized water.
Specifically, the low-melting-point glass powder comprises the following raw materials in parts by weight: 30 parts of 40-50 nm silicon dioxide, 10 parts of lithium oxide, 10 parts of zinc oxide, 10 parts of barium oxide, 10 parts of potassium oxide and 10 parts of sodium oxide.
The preparation method of the low-melting-point glass powder comprises the following steps: the raw materials with the formula ratio are stirred to be uniform, the reaction is carried out for 18h under the conditions that the temperature is 400 ℃ and the pressure is 40MPa, and then the ultra-low temperature fused silica metal salt, namely the low-melting-point glass powder, is obtained through the procedures of washing, drying, coarse grinding, purity maintaining, accurate grinding and precise grading.
Wherein the wetting dispersant is produced by the Tao Biotechnology Co., ltd of CAS:9003-04-7 parts of sodium polyacrylate dispersant. The curing agent is water-based silicone-acrylic emulsion with a silicon-oxygen structure (-Si-O-). The thickener is A151 (vinyl triethoxysilane).
The preparation method of the inorganic low-temperature microcrystalline ceramic coating comprises the following steps:
1) Adding the wetting dispersant and the low-melting-point glass powder into water according to the formula amount, and stirring at the rotating speed of 1500r/min until the materials are fully mixed to obtain a mixture;
2) Adding nano-scale titanium dioxide, titanium nitride powder, nano-alumina, nano-silica, nano-titania, nano-zirconia and graphene into the mixture obtained in the step 1), and stirring and dispersing for 2 hours at the rotating speed of 1800r/min to obtain a dispersion liquid;
3) Adding a thickening agent and a curing agent into the dispersion liquid obtained in the step 2), and uniformly stirring to obtain the inorganic low-temperature microcrystalline ceramic coating.
Example 2
An inorganic low-temperature microcrystalline ceramic coating comprises the following raw materials in parts by weight: 35 parts of low-melting-point glass powder, 13 parts of curing agent, 9 parts of nano-scale titanium dioxide, 7 parts of titanium nitride powder, 12 parts of nano-alumina, 12 parts of nano-silica, 12 parts of nano-titania, 12 parts of nano-zirconia, 4 parts of graphene, 2 parts of wetting dispersant, 2 parts of thickener and 25 parts of water.
Specifically, the low-melting-point glass powder comprises the following raw materials in parts by weight: 35 parts of 40-50 nm silicon dioxide, 15 parts of lithium oxide, 15 parts of zinc oxide, 15 parts of barium oxide, 15 parts of potassium oxide and 15 parts of sodium oxide.
The preparation method of the low-melting-point glass powder comprises the following steps: the raw materials with the formula ratio are stirred to be uniform, the reaction is carried out for 24 hours under the conditions that the temperature is 430 ℃ and the pressure is 45MPa, and then the ultra-low temperature fused silica metal salt, namely the low melting point glass powder, is obtained through the procedures of washing, drying, coarse grinding, purity maintaining, accurate grinding and precise grading.
Wherein the wetting and dispersing agent is produced by Hangzhou billow biological science and technology company with the model of CAS:9003-04-7 parts of sodium polyacrylate dispersant. The curing agent is water-based silicone-acrylic emulsion with a silicon-oxygen structure (-Si-O-). The thickener is A171 (vinyltrimethoxysilane).
The preparation method of the inorganic low-temperature microcrystalline ceramic coating comprises the following steps:
1) Adding the wetting dispersant and the low-melting-point glass powder into water according to the formula amount, and stirring at the rotating speed of 1600r/min until the materials are fully mixed to obtain a mixture;
2) Adding nano-scale titanium dioxide, titanium nitride powder, nano-alumina, nano-silica, nano-titania, nano-zirconia and graphene into the mixture obtained in the step 1), and stirring and dispersing for 2 hours at the rotating speed of 1800r/min to obtain a dispersion liquid;
3) Adding a thickening agent and a curing agent into the dispersion liquid obtained in the step 2), and uniformly stirring to obtain the inorganic low-temperature microcrystalline ceramic coating.
Example 3
An inorganic low-temperature microcrystalline ceramic coating comprises the following raw materials in parts by weight: 40 parts of low-melting-point glass powder, 15 parts of curing agent, 10 parts of nano-scale titanium dioxide, 8 parts of titanium nitride powder, 15 parts of nano-alumina, 15 parts of nano-silica, 15 parts of nano-titania, 15 parts of nano-zirconia, 5 parts of graphene, 3 parts of wetting dispersant, 3 parts of thickener and 30 parts of deionized water.
Specifically, the low-melting-point glass powder comprises the following raw materials in parts by weight: 40 parts of 40-50 nm silicon dioxide, 20 parts of lithium oxide, 20 parts of zinc oxide, 20 parts of barium oxide, 20 parts of potassium oxide and 20 parts of sodium oxide.
The preparation method of the low-melting-point glass powder comprises the following steps: stirring the raw materials according to the formula ratio to be uniform, reacting for 12 hours at the temperature of 450 ℃ and the pressure of 50MPa, and then sequentially carrying out the procedures of washing, drying, coarse grinding, pure maintaining, fine grinding and precise classification to obtain the ultralow-temperature fused silica metal salt, namely the low-melting-point glass powder.
Wherein the wetting dispersant is produced by the Tao Biotechnology Co., ltd of CAS:9003-04-7 parts of sodium polyacrylate dispersant. The curing agent is water-based silicone-acrylic emulsion with a silicon-oxygen structure (-Si-O-). The thickening agent is A172 (vinyl tri (beta-methoxy ethoxy) silane.
The preparation method of the inorganic low-temperature microcrystalline ceramic coating comprises the following steps:
1) Adding the wetting dispersant and the low-melting-point glass powder into water according to the formula amount, and stirring at the rotating speed of 1800r/min until the materials are fully mixed to obtain a mixture;
2) Adding nano-scale titanium dioxide, titanium nitride powder, nano-alumina, nano-silica, nano-titania, nano-zirconia and graphene into the mixture obtained in the step 1), and stirring and dispersing at the rotating speed of 2000r/min for 2 hours to obtain a dispersion liquid;
3) Adding a thickening agent and a curing agent into the dispersion liquid obtained in the step 2), and uniformly stirring to obtain the inorganic low-temperature microcrystalline ceramic coating.
Comparative example 1
Comparative example 1 differs from example 1 in that: comparative example 1 no low-melting glass frit was added. The remaining components and preparation were the same as in example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that: comparative example 2 no wetting dispersant was added.
The remaining components and preparation were the same as in example 1.
Comparative example 3
Comparative example 3 differs from example 1 in that: comparative example 3 no thickener was added. The remaining components and preparation were the same as in example 1.
Performance testing
The sample adopts an aluminum alloy inner container electric cooker purchased in the common market, the inorganic low-temperature microcrystalline ceramic coating prepared in the embodiment 1-3 and the coating of the comparative example 1-3 are respectively sprayed in a sample cooker, and the coating with the thickness of 25 microns is formed by sintering and curing at 460 ℃ for 20 minutes. Setting a control group as a Teflon coating with the same thickness, and respectively carrying out temperature resistance, wear resistance and dry burning comparison tests on the experimental group and the control group; wherein, the standard used in the test is as follows: salt spray test and wear-resistant machine test. Specific data are shown in table 1.
Table 1 physicochemical property indexes of respective groups
Figure BDA0003824997560000091
Figure BDA0003824997560000101
As can be seen from Table 1, the temperature resistance, wear resistance and stability of the inner containers of the aluminum alloy electric rice cooker sprayed with the inorganic low-temperature microcrystalline ceramic coatings of the examples 1 to 3 are higher than those of the control group and the comparative examples 1 to 3, and no harmful substances are generated after dry burning, which indicates that the inorganic low-temperature microcrystalline ceramic coatings of the examples 1 to 3 belong to non-toxic, odorless and pollution-free inorganic ceramic coatings and have high safety.
Therefore, the coating disclosed by the invention is stable in performance, high in safety, has a far infrared function, does not contain harmful substances such as heavy metal, PFOA and the like, can resist the high temperature of more than 600 ℃, is high in wear resistance, is hydrophilic in physical non-stick property, has a contact angle of 20 degrees which is completely opposite to the oleophobic and hydrophobic properties of organic Teflon coating, has a Teflon contact angle of 130 degrees, is firmer compared with an enamel pot, is not easy to crack, is acid-resistant and alkali-resistant, and is more resistant to rapid change of cold and heat. In addition, the heating is even, and the heating and heat storage effects of the aluminum-based pot body are better.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (10)

1. The inorganic low-temperature microcrystalline ceramic coating is characterized by comprising the following raw materials in parts by weight: 30-40 parts of low-melting-point glass powder, 10-15 parts of curing agent, 8-10 parts of nano-scale titanium dioxide, 6-8 parts of titanium nitride powder, 10-15 parts of nano-alumina, 10-15 parts of nano-silica, 10-15 parts of nano-titania, 10-15 parts of nano-zirconia, 3-5 parts of graphene, 1-3 parts of wetting dispersant, 1-3 parts of thickener and 20-30 parts of water.
2. The inorganic low-temperature microcrystalline ceramic coating of claim 1, wherein the low-melting glass powder is prepared by melting raw materials of silicon dioxide, lithium oxide, zinc oxide, barium oxide, potassium oxide and sodium oxide into a glass body through a high-temperature evaporation and condensation process, and then sequentially carrying out the steps of washing, drying, coarse grinding, fine grinding and classification.
3. The inorganic low temperature microcrystalline ceramic coating of claim 2 wherein the conditions of the high temperature evaporation condensation process are: the temperature is 400-450 ℃, the pressure is 40-50 MPa, and the time is 12-24 h.
4. The inorganic low-temperature microcrystalline ceramic coating of claim 1, wherein the low-melting glass frit comprises the following raw materials in parts by weight: 40 to 50 parts of silicon dioxide, 10 to 20 parts of lithium oxide, 10 to 20 parts of zinc oxide, 10 to 20 parts of barium oxide, 10 to 20 parts of potassium oxide and 10 to 20 parts of sodium oxide.
5. The inorganic low temperature microcrystalline ceramic coating of claim 1 wherein said wetting dispersant is a sodium polyacrylate dispersant.
6. The inorganic low temperature microcrystalline ceramic coating of claim 1 wherein the curing agent is an aqueous silicone acrylic emulsion having a silicone oxygen structure.
7. The inorganic low temperature microcrystalline ceramic coating of claim 1 wherein the thickener is a silane coupling agent having the molecular formula Y-R-Si (OR) 3 (ii) a Wherein Y is an organofunctional group and SiOR is a siloxy group.
8. The method for preparing the inorganic low-temperature microcrystalline ceramic coating of any one of claims 1-7, characterized by comprising the following steps:
1) Adding the wetting dispersant and the low-melting-point glass powder into water according to the formula amount, and stirring until the wetting dispersant and the low-melting-point glass powder are fully mixed to obtain a mixture;
2) Adding nano-scale titanium dioxide, titanium nitride powder, nano-alumina, nano-silica, nano-titania, nano-zirconia and graphene into the mixture obtained in the step 1), and stirring and dispersing to obtain a dispersion liquid;
3) Adding a thickening agent and a curing agent into the dispersion liquid obtained in the step 2), and uniformly stirring to obtain the inorganic low-temperature microcrystalline ceramic coating.
9. The preparation method of the inorganic low-temperature microcrystalline ceramic coating according to claim 8, wherein in the step 1), the stirring speed is 1500-1800 r/min; in the step 2), the stirring speed is 1700-2000 r/min.
10. The use of the inorganic low temperature microcrystalline ceramic coating of any of claims 1-7, wherein the inorganic low temperature microcrystalline ceramic coating is used for preparing an aluminum based pan coating.
CN202211056255.0A 2022-08-31 2022-08-31 Inorganic low-temperature microcrystalline ceramic coating and preparation method and application thereof Pending CN115449239A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116355471A (en) * 2023-03-31 2023-06-30 广东晟毅新材料科技有限公司 Super-hydrophobic coating, super-hydrophobic glass and super-hydrophobic toughened glass and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116355471A (en) * 2023-03-31 2023-06-30 广东晟毅新材料科技有限公司 Super-hydrophobic coating, super-hydrophobic glass and super-hydrophobic toughened glass and preparation method thereof
CN116355471B (en) * 2023-03-31 2024-03-29 广东晟毅新材料科技有限公司 Super-hydrophobic coating, super-hydrophobic glass and super-hydrophobic toughened glass and preparation method thereof

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