KR20220128811A - Functional inorganic ceramic coating agent containing functional ceramic materials and their manufacturing methods - Google Patents

Abstract

The present invention, in an inorganic ceramic coating composition comprising a functional ceramic, an inorganic binder, and a pigment, relates to a coating agent, in which the coating implemented by the present invention not only has excellent heat resistance and chemical resistance, but also emits 90.2 % in a 5 to 20 ㎛ region as a functional ceramic material, which is the most beneficial wavelength for the human body, and the radiant energy represents 3.690 × 10^2 W/m^2 (analyzed by the Korea Institute of Ceramic Engineering and Technology). The coating agent of the present invention has excellent physical properties such as acid resistance, alkali resistance, accelerated weather resistance, and durability against salt water, and is an eco-friendly coating agent that does not generate air pollutants such as VOCs and formaldehyde.

Description

Functional inorganic ceramic coating agent containing functional ceramic materials and their manufacturing methods

The present invention relates to an inorganic ceramic coating agent containing a functional ceramic material and a method for manufacturing the same. As a coating agent, it is manufactured with simple raw materials such as silane compound, water glass, and functional ceramic powder, so it can exhibit functionality. It relates to an inorganic ceramic coating agent containing a functional ceramic material and a method for manufacturing the same.

In general, a coating agent is applied to protect the surface of the metal.

Existing coating agents for surface protection of metals are used by mixing organic solvents such as urethane resins, epoxy resins, and acrylic resins, which are organic resins using organic compounds. There is an electrostatic coating, and these paints or coatings are in liquid form. On the other hand, there is a powder coating in which a coating or coating is applied by processing a paint or coating agent into powder.

Coatings made of the organic solvents or organic compounds listed above have advantages such as a variety of coating and coating methods have been developed and a variety of materials to choose from. Due to VOC's (Volatile Organic Compounds) generated when organic compounds such as organic compounds evaporate, they have a negative effect on the human body when inhaled, and can cause air pollution when diffused into the atmosphere. Reactivity of organic paints In order to increase the level of endocrine-disrupting substances such as bisphenol A is used, especially when it comes into contact with water, it elutes and is highly likely to act as an endocrine-disrupting substance when absorbed into the human body.

Therefore, when painting using an organic resin-based coating agent, there are restrictions on the place and equipment that must be coated or painted in a place equipped with special facilities that can minimize the impact on the human body and prevent air pollution, and disrupt the endocrine system. Measures to minimize the amount of material should be prepared.

As a coating agent that can improve the disadvantages of such organic resin coatings, the method of surface coating using enamel, which has been derived from ceramic glaze, etc. There is an advantage of no environmental pollution, and these enamel coatings have recently been applied to the surface coating of heating vessels, etc., and the scope of application is expanding. However, although the coating of the surface using enamel varies depending on the properties of the enamel, enamel generally forms a coating film by melting at a high temperature of 750° C. It is difficult, and when the temperature exceeds 700° C., heat deformation of the iron itself starts, so there are disadvantages such as damage to the original shape of the coating object.

A coating agent that improves the disadvantages of the enamel coating and lowers the heat treatment temperature is a ceramic paint.

Coating with conventional ceramic paints is generally applied to kitchen utensils to give functionality such as heat resistance, abrasion resistance, and non-stick. There was no example of providing functionality by coating large structures such as machines and instruments. Most of the metal coating by the ceramic paint is a coating agent containing fluorine as a main component. Such coatings containing fluorine as a main component increase heat conduction and have many advantages such as non-stick function. It is pointed out as a problem that it is harmful to health if humans ingest it.

In addition, although there is a ceramic coating agent for coating using enamel, the selection of a coating object is limited due to high-temperature firing, which is a characteristic of enamel, and commercialization or commercialization is difficult due to the problem that the object is deformed by heat.

Existing inorganic coating agents use water glass to form a coating film as in Korean Patent Registration Nos. 10-0895052 and 10-1775537, or inorganic binders made of a mixture of silica sol, alumina sol, and zirconia sol, functional filler, ceramic It is composed of raw materials of various components consisting of the subject and additives such as powder melting point regulator, and in Korean Patent No. 10-0512599, functional fillers such as silicon mixture, tourmaline, ocher, etc. minerals, quartz, to give functionality such as far-infrared radiation. , monzonite, gneiss, and rhyolite tuff. However, the existing patents basically require a lot of energy cost from the composition preparation stage because various compositions must be mixed and sintered at a high temperature to form a coating material, and since many types of materials are used to give functionality, the composition is There was a problem that there is a possibility that the functionality of the coating may change whenever it is changed.

KR 10-1104680 “Enamel cookware with non-stick ceramic coating layer” KR 10-0871877 “Ceramic coated steel heating cookware and its manufacturing method”

An object of the present invention is to solve the problems of the existing ceramic coating agent, and it is possible to prevent deformation of the coating object by heat treatment at a low temperature while fully having the functionality of functional minerals, and to make it easy to manufacture and inexpensive to manufacture. To provide an inorganic ceramic coating agent containing a ceramic material and a method for manufacturing the same.

For this purpose of the present invention, a silicate-based mineral is primarily processed into a fine powder of about 1000 mesh or more and dispersed in water or a solvent to be used as a raw material, and these silicate-based minerals replace alumina, silica, zirconia, etc. as conventional ceramic coating materials Inorganic ceramic coating agent containing a functional ceramic material according to the present invention, which has the functionality that alumina, silica, and zirconia do not have, and adds functionality to it while maintaining the advantages of the existing ceramic coating using silicate-based minerals is achieved by

This object of the present invention is to form a high sintering density even at a low temperature of 150 ~ 300 ℃ by coating the surface of the metal to improve the surface hardness, thereby improving the durability and heat resistance of the coating film, as well as to provide corrosion resistance This is achieved by the inorganic ceramic coating agent containing the functional ceramic material according to the present invention, which can easily remove surface contamination with excellent Non-Stick function.

It is an object of the present invention, in the inorganic ceramic coating composition comprising a functional ceramic, an inorganic binder, and a pigment, 10-20 wt% of silicate-based mineral powder, 10-15 wt% of manganese dioxide (MnO ₂ ) 1000mesh or more 45-55 wt% of a functional ceramic mixture dispersed in 70-80 wt% of water or solvent and 20-40 wt% of water glass, a sodium silicate (liquid) aqueous solution obtained by melting silicon dioxide and alkali, which are inorganic binders, Functional ceramic produced by hydrolysis by mixing 5-8 wt% of a pigment, 5-10 wt% of acetic acid as a reaction catalyst, and 45-55 wt% of a reaction solution adjusted to a pH of 3.5-4.0 by sequentially adding to the remaining alkylsilane In the step of preparing the main part of the coating composition, an excellent sintering density including an organoalkoxysilane compound in which 60 to 65 wt% of an alkoxy alkoxysilane-based silane compound and 35-40 wt% of IPA (isopropyl alcohol) are mixed. A step of preparing a curing agent that can It is achieved by a method for producing an inorganic ceramic coating agent containing a functional ceramic material according to the present invention comprising the step of causing.

The composition of the silicate-based mineral added in the present invention is SiO ₂ 10.50 ~ 16.50 wt%, Al ₂ O ₃ 7.32 ~ 12.20 wt%, MgO 8.05 ~ 12.50 wt%, Fe ₂ O ₃ 6.80 ~ 13.50 wt%, Ti 0.95 ~ 1.65 It consists of wt%, and also contains 0.0035 to 0.0058 wt% of Y, 0.0075 to 0.0117 wt% of La, and 0.005 to 0.009 wt% of Nd.

The functional inorganic ceramic coating agent containing the functional ceramic material of the present invention and its manufacturing method differ from the conventional ceramic coating agent by grinding and mixing the silicate-based mineral powder, which is a functional ceramic material, together with the ceramic material to 1000 mesh or less, and then mixing it with the ceramic material, which is stable in a solvent. As a coating agent manufactured as the main material, it has high heat resistance and chemical resistance compared to general ceramic coatings. The surface also has a higher hardness compared to general ceramic coatings, so it can be used for heating kitchen appliances as well as high-temperature mechanical devices such as pyrolysis devices. Not only can the durability be improved by coating the mechanical devices in contact with chemicals, but also the high far-infrared radiation, which is the functionality of the silicate-based mineral, which is an important material of the present invention, is functional as in the experimental example, such as antibacterial, airfighting, and deodorizing. When applied to all storage containers used in the kitchen as well as heated kitchen appliances, it can exhibit functionality such as delay of rancidity and corrosion, and is heated with heat-resistant performance that does not change the physical properties of the coated surface even at temperatures above 500℃ When coated on a surface, it can exhibit the functions of surface protection such as prevention of oxidation due to heating and prevention of corrosion due to blocking of moisture and oxidizing substances.

The functional inorganic ceramic coating agent containing the functional ceramic material of the present invention and its manufacturing method cannot guarantee the durability of the coating due to peeling and thermal deformation on the surface of the metal coated with the existing ceramic coating agent, which shortens the replacement cycle of mechanical devices. The functional ceramic coating agent of the present invention, which has improved the shortcomings, can prevent oxidation and corrosion by coating the surface of heating kitchen appliances as well as heating machine tools by improving longer durability and chemical resistance, etc., and increases the replacement cycle. Functions such as anti-corruption and deodorization can be expected due to increased economic feasibility and abundant far-infrared radiation characteristic of silicate minerals can also be expected.

1 is a process diagram showing a manufacturing process of the functional ceramic coating agent of the present invention.

Hereinafter, a method for manufacturing an inorganic ceramic coating agent containing a functional ceramic material according to the present invention and its characteristics will be described in detail.

First, silicate-based minerals are widely distributed on the surface and can be classified into six types. The first is stratified silicate mineral, second is reticulated silicate mineral, third is cyclic silicate mineral, fourth is reticulated silicate mineral, fifth is isolated tetrahedral silicate mineral, and sixth is tetrahedral silicate mineral. It is used by pulverizing silicate-based minerals with excellent functionality to around 1000 mesh and dispersing them in water or solvent.

The composition of the silicate-based mineral added in the present invention is SiO ₂ 10.50 ~ 16.50 wt%, Al ₂ O ₃ 7.32 ~ 12.20 wt%, MgO 8.05 ~ 12.50 wt%, Fe ₂ O ₃ 6.80 ~ 13.50 wt%, Ti 0.95 ~ 1.65 It consists of wt%, and also contains 0.0035 to 0.0058 wt% of Y, 0.0075 to 0.0117 wt% of La, and 0.005 to 0.009 wt% of Nd.

As shown in FIG. 1 , the method for manufacturing an inorganic ceramic coating agent containing a functional ceramic material according to the present invention includes the steps of manufacturing a main part (S1), manufacturing a curing agent part (S2), and a main part and a curing agent. It includes a step of mixing the parts (S3), a step of reacting in a rolling machine (S4), and a step of completing the functional ceramic coating agent (S5).

In the method for manufacturing the inorganic ceramic coating agent containing the functional ceramic material according to the present invention, the step (S1) of preparing the main part is an inorganic ceramic coating composition comprising a functional ceramic, an inorganic binder, and a pigment, the silicate-based mineral powder 10-20 wt%, 10-15 wt% of manganese dioxide (MnO ₂ ) 45-55 wt% of a functional ceramic mixture dispersed in 70-80 wt% of water or solvent by grinding to 1000 mesh or more 20-40 wt% of water glass, a sodium silicate (liquid) aqueous solution obtained by melting silicon and alkali, 5-8 wt% of a pigment, 5-10 wt% of acetic acid, a reaction catalyst, and the remaining alkylsilane are sequentially added to adjust the pH to 3.5 A main part of a functional ceramic paint composition prepared by hydrolysis is prepared by mixing 45 to 55 wt% of the reaction solution adjusted to ~4.0. Here, 60 to 65 wt% of an alkoxy alkoxysilane-based silane compound and 35 to 40 wt% of IPA (isopropyl alcohol) are mixed to prepare a curing agent part capable of forming an excellent sintering density including an organoalkoxysilane compound ( S2) and the step of causing hydrolysis and condensation reaction for 15 to 24 hours (preferably around 20 hours) at room temperature with a rolling machine rotating around 300 rpm by mixing the above main agent and curing agent at a mixing ratio of 1:1 It is achieved by a method for manufacturing an inorganic ceramic coating agent containing a functional ceramic material according to the present invention, including

At this time, the composition of the water glass and the alkoxysilane is limited to be suitable for the hydrolysis reaction, and when the composition ratio of the functional silicate mineral is 10 wt% or less, sufficient functionality cannot be exhibited. is limited to

In the method for manufacturing an inorganic ceramic coating agent containing a functional ceramic material according to the present invention, the step (S3) of mixing the main part and the curing agent part is stirred for a certain time to ensure that the main part and the curing agent part are evenly mixed and the reaction time of each component is ensured. take time to do At this time, the stirring time for mixing is 15 to 24 hours (preferably around 20 hours) at room temperature.

In the method for producing an inorganic ceramic coating agent containing a functional ceramic material according to the present invention, the step (S4) of reacting in the rolling machine is the main part and the curing agent part in a rolling machine (around 300 rpm) at room temperature for 15 to 24 hours, preferably is reacted for about 20 hours, and in this way, includes a step (S5) of completing the functional ceramic coating agent. In this case, the mixing ratio of the main part and the curing agent part is preferably 1:1.

The composition of the inorganic ceramic coating agent containing the functional ceramic material of the present invention is, in the inorganic ceramic coating composition including the functional ceramic, the inorganic binder, and the pigment, 10-20 wt% of the functional ceramic, silicate-based mineral powder, manganese dioxide ( MnO ₂ ) 45-55 wt% of a functional ceramic mixture dispersed in 70-80 wt% of water or solvent by pulverizing 10-15 wt% to 1000 mesh or more, and sodium silicate ( Liquid) 20-40 wt% of water glass as an aqueous solution, 5-8 wt% of pigment, 5-10 wt% of acetic acid as a reaction catalyst, and 45-55 wt of a reaction solution adjusted to a pH of 3.5-4.0 by sequentially adding the remaining alkylsilane % to prepare a main part of a functional ceramic paint composition prepared by hydrolysis.

Functional ceramic according to the present invention, comprising the step of mixing the main part and the curing agent in a 1:1 ratio and causing a hydrolysis and condensation reaction for 15 to 24 hours (preferably around 20 hours) with a rolling machine rotating around 300 rpm It is achieved by a method for manufacturing an inorganic ceramic coating agent containing a material.

Specifically, 50 wt% of a functional ceramic mixture in which 10-20 wt% of silicate-based mineral powder and 10-15 wt% of manganese dioxide (MnO ₂ ) are dispersed in water or 70-80 wt% of a solvent finely divided into more than 1000mesh, here 20-40 wt% of water glass, a sodium silicate (liquid) aqueous solution obtained by dissolving alkali in silicon dioxide, an inorganic binder, 5-8 wt% of a pigment, 5-10 wt% of acetic acid, a reaction catalyst, and the remaining alkylsilane are added in sequence to adjust the pH to 3.5 to 4.0 and mix 50 wt% of the reaction solution subjected to the hydrolysis reaction to complete the main part of the coating solution.

In this reaction solution, 60 to 65 wt% of an alkoxysilane-based silane compound and 35 to 40 wt% of IPA (isopropyl alcohol) are mixed with an organoalkoxysilane compound to produce a curing agent that can form an excellent sintering density. Excellent including the step (S2) and the step of causing hydrolysis and condensation reaction for 15 to 24 hours (preferably around 20 hours) with a rolling machine rotating around 300 rpm by mixing the main part and the curing agent part in a 1:1 ratio To complete the functional ceramic coating of the present invention capable of forming a sintered density.

After removing foreign substances from the surface by sand blasting or shot blasting, the finished functional ceramic coating agent forms a 60-180㎛ coating film on the metal surface using spray or dipping technique, and after the coating film dries, 150- Heat treatment for 5 to 20 minutes in a furnace at 300 ° C. improves the surface hardness of the coating film formed on the metal surface, which is an advantage of the coating agent of the present invention, and increases the durability and heat resistance of the coating film, as well as improving corrosion resistance. And with its excellent Non-Stick function, it is possible to complete the inorganic ceramic coating that can easily remove surface contamination. In this case, the spray gun used for forming the coating film preferably has a nozzle diameter of 0.8 to 1.5 mm, and the pressure of compressed air for the operation of the spray gun is preferably 5 to 8 kg/cm ³ , and the spray gun is formed by spraying. As for the thickness of a coating film, 60-180 micrometers is preferable.

Hereinafter, the present invention will be described in more detail through specific examples.

[Example]

Functional ceramics, specifically, 10 wt% of silicate-based mineral powder, 10 wt% of manganese dioxide (MnO ₂ ) pulverized to about 1000mesh and dispersed in 80 wt% of water or solvent 50 wt% of a functional ceramic mixture, here an inorganic binder A mixture prepared by sequentially adding 40 wt% of water glass, 50 wt% of an alkylsilane, 5 wt% of a pigment, and 5 wt% of acetic acid as a reaction catalyst, is produced by hydrolysis, which is an aqueous sodium silicate (liquid) aqueous solution obtained by melting phosphorus silicon dioxide and alkali. The main part of the functional ceramic paint composition was prepared, and a curing agent part capable of forming excellent sintering density by mixing an organoalkoxysilane compound mixed with 60 wt% of an alkoxysilane-based silane compound and 40 wt% of IPA (isopropyl alcohol) The functionality of the coating agent manufactured by the manufacturing method of the inorganic ceramic coating agent containing the functional ceramic material according to the present invention in which the main agent and the curing agent part are mixed 1:1 and mixed at room temperature for 20 hours with a rolling machine rotating around 300 rpm Verification is the same as the following examples and test examples.

[Example 1]

The results of testing the far-infrared emissivity of the metal surface coated with the functional ceramic coating agent of the present invention with a coating agent containing 10 wt% of silicate-based minerals. The coating thickness of the metal surface applied with the functional ceramic coating agent of the present invention was coated to 100㎛.

[Example 2]

The results of testing the far-infrared emissivity of the metal surface coated with the functional ceramic coating agent of the present invention with a coating agent containing 5 wt% of silicate-based minerals. The coating thickness of the metal surface applied with the functional ceramic coating agent of the present invention was coated to 100㎛.

As can be seen from the above examples, the far-infrared emissivity and radiant energy of the metal surface coated with the functional ceramic coating agent of the present invention in which 10 wt% of the silicate-based mineral of [Example 1] was mixed was the silicate of [Example 2]. Since the far-infrared emissivity and radiant energy of the metal surface coated with the ceramic coating agent containing 5 wt% of the mineral-based mineral are significantly high, it can be seen that the content of the silicate-based mineral plays a decisive role in imparting the functionality of the functional ceramic coating agent of the present invention. have.

Therefore, it was found that the silicate-based minerals in the above examples have a great influence on the functionality of the functional ceramic coating agent of the present patent. Based on the above Example 1, the functionality of the functional ceramic coating agent of the present invention was verified through analysis to be an eco-friendly coating agent while having the functionality as in the following Test Examples 1 to 5.

[Test Example 1]

These are the results of testing the antimicrobial properties of the metal surface coated with the functional ceramic coating agent of the present invention.

※ Used strain: Escherichia coli ATCC 8739

Pseudomonas aeruginosa ATCC 15442

Staphylococcus aureus ATCC 6538P

As shown in the test results, in the sample coated with the present invention after 24 hours, each strain failed to proliferate, and showed excellent results showing a reduction rate of 99.9%.

[Test Example 2]

It is the result of testing the anti-fungal property of the metal surface coated with the functional ceramic coating agent of the present invention.

※ Fungal strain (mixed strain)

Aspergillus nigar ATCC 9642

Penicillium pinophilum ATCC 11797

Chaetomium globosum ATCC 6205

Gliocladium virens ATCC 9645

Aureobasidium pullulans ATCC 15233

As a result of inoculation of the mold mixed strain in the test results, the growth of mycelia was not recognized at all.

[Test Example 3]

The result of testing the far-infrared emissivity of the metal surface coated with the functional ceramic coating agent of the present invention.

The results of the above test are experimental data regarding the emissivity and radiant energy in the wavelength range of 5-20 μm, which is the most beneficial to our body. As a result of the test, it can be seen that the wavelength band and radiation energy are large.

[Test Example 4]

These are the results of testing the durability of the metal surface coated with the functional ceramic coating agent of the present invention.

In relation to the durability of the coating film, durability indicating atmospheric corrosiveness and salt spray test for promoting corrosion were performed, and both categories showed no abnormal results.

[Test Example 5]

These are the results of testing the chemical resistance and environmental friendliness of the metal surface coated with the functional ceramic coating agent of the present invention.

The above test is a test result related to the chemical resistance and eco-friendliness of the coating of the present invention. Both acid resistance and alkali resistance were not abnormal, and it can be seen that VOCs and formaldehyde, which are environmental pollutants harmful to our body, were hardly emitted from the coating.

[Comparative Example 1]

According to Korean Patent No. 10-2110301 “Environment-friendly composite ceramic coating composition for steel structures and manufacturing method thereof,” a composite ceramic coating agent is described for the purpose of surface protection and oxidation prevention of steel structures, but most of the composition of the coating agent The composition uses solvent-free oil-based epoxy as the main ingredient, and it is characterized by using a water-soluble epoxy curing agent and several inorganic materials as a curing agent. However, in the case of the above patent, the subject is a solvent-free oil-based epoxy, which cannot be strictly called an inorganic coating agent, and therefore does not have the functionality of the present invention.

[Comparative Example 2]

According to Korean Patent No. 10-0512599 “Negative ion emission and far-infrared emission inorganic ceramic coating composition”, it is a functional paint that can be fired at a low temperature, but it is a material for imparting functionality. Anion emission of one rare earth natural stone selected from strontium, vanadium, zirconium, cerium, neodium, lanthanum, barium, rubidium, cesium, and gallium as an anion generating material by using and adding a far-infrared emitting material including at least one selected from Since it is composed of materials, there are various types of materials and there are difficulties in composition, and the hardness of the coating film, which is the most important of the coating agent, is low, so there is a limit to using it as a coating agent for surface protection of mechanical devices that requires strong durability.

The functional inorganic ceramic coating agent containing the functional ceramic material according to the present invention and the method for manufacturing the same are possible to repeatedly manufacture the same product in the coating agent manufacturing industry, and it is possible to repeatedly perform the same method. Therefore, industrial applicability I would call it an invention with this.

Claims (2)

In the method for manufacturing an inorganic ceramic coating agent containing a functional ceramic material,
The method for producing an inorganic ceramic coating agent containing the functional ceramic material is to grind 10-20 w% of silicate-based mineral powder, 5-10 wt% of manganese dioxide (MnO ₂ ) to 1000 mesh or more, and water or solvent 70-85 50 wt% of functional ceramic mixture dispersed in wt%, water glass as an aqueous solution of sodium silicate (liquid) obtained by dissolving alkali in silicon dioxide, an inorganic binder, 20-40 wt% Alkylsilane 25-50 wt%, pigment 5-8 Preparing a main part of a functional ceramic paint composition prepared by hydrolysis by mixing 50 wt% of a reaction solution adjusted to a pH of 3.5 to 4.0 by mixing wt% and 5 to 10 wt% of acetic acid as a reaction catalyst;
Here, 50 to 60 wt% of an alkoxysilane-based silane compound and 40 to 50 wt% of IPA (isopropyl alcohol) are mixed to prepare a curing agent capable of forming an excellent sintering density with an organoalkoxysilane compound;
It characterized in that it comprises the step of causing hydrolysis and condensation reaction for 15 to 24 hours (preferably around 20 hours) at room temperature conditions with a rolling machine rotating around 300 rpm by mixing the above subject and curing agent in a 1:1 ratio Manufacturing method of inorganic ceramic coating agent containing functional ceramic material
The method of claim 1,
After the functional ceramic coating agent completed with the base material of claim 1 removes foreign substances from the surface by sand blasting or shot blasting, a 60-180㎛ coating film is formed on the surface of the metal by spraying or dipping technique. After drying, the method for producing an inorganic ceramic coating agent containing a functional ceramic material, characterized in that it further comprises the step of heat treatment for 5 minutes to 20 minutes in a heating furnace of 150 ~ 300 ℃

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