CN111995949A - High-temperature-resistant coating and preparation method thereof - Google Patents
High-temperature-resistant coating and preparation method thereof Download PDFInfo
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- CN111995949A CN111995949A CN202010676791.5A CN202010676791A CN111995949A CN 111995949 A CN111995949 A CN 111995949A CN 202010676791 A CN202010676791 A CN 202010676791A CN 111995949 A CN111995949 A CN 111995949A
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- 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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention relates to a high-temperature-resistant coating and a preparation method thereof. The high-temperature resistant coating is two-component; the component A comprises organic silicon resin, cadmium red, a dispersant, an auxiliary agent and a solvent, and the raw materials are mixed and dispersed to prepare the component A; wherein the mass content of inorganic components in the organic silicon resin is not less than 60 percent; the component B is alcohol-soluble silica sol; and mixing the component A and the component B to form the high-temperature-resistant coating. The high-temperature-resistant coating has low requirement on pretreatment of a base material and outstanding high-temperature resistance of a coating, solves the color loss phenomenon of the cadmium red pigment at high temperature to a great extent, and has wide application prospect.
Description
Technical Field
The invention relates to the field of new materials, in particular to a high-temperature-resistant coating and a preparation method thereof.
Background
The high-temperature resistant coating is a functional coating which can still keep certain physicochemical properties under the condition of long-term high temperature (more than or equal to 1000h) so as to ensure that a protected object can normally run. High temperature resistant coatings have been studied for a long time and coating film forming resins and pigments have also changed depending on the specific application temperature. When the use temperature exceeds 1000 ℃, the coating is generally coated by adopting a mode of thermally spraying metal/nonmetal oxides; below 1000 c, organically modified silicones or pure silicones are most commonly used as film formers.
One unavoidable disadvantage of the high-temperature silicone coating is that the corrosion resistance of the coating is greatly reduced along with the decomposition and secondary film formation of the silicone resin under high-temperature conditions. The stainless steel is selected as the base material, so that the corrosion problem caused by the reduction of the anti-corrosion performance of the coating can be delayed. In the current technical scheme, the adhesive force of the organic silicon high-temperature resistant coating on the base material is increased by sand blasting treatment of most stainless steel, so that the high-temperature resistant upper limit of the coating is improved. However, the problems of energy consumption, environmental pollution, low efficiency and deformation of the substrate caused by sand blasting are all urgently needed to be solved. Therefore, reducing the pretreatment requirements of the stainless steel substrate becomes an important target for developing the organic silicon high-temperature resistant coating.
At present, the organosilicon high-temperature resistant coating with the use temperature of 500-1000 ℃ is mainly black or metallic. Red is the most vivid color and has a better degree of discrimination than black and metallic colors. Cadmium red is a red inorganic pigment with highest temperature resistance, however, in organic silicon resin, cadmium red easily loses color at high temperature, and the color loss mechanism of cadmium red at high temperature is not clarified in the prior research. In addition, stainless steel often involves post-processing issues after being sprayed with a high temperature resistant coating. The great increase of the content of inorganic substances in the silicone resin can lead to the embrittlement of the coating, and the coating is easy to crack and peel during the post-processing of the surface of the stainless steel plate without sand blasting, which is also a problem needing attention in research.
Disclosure of Invention
The first object of the present invention is: provides a novel sandblast-free stainless steel high-temperature-resistant coating. The coating takes cadmium red as a main pigment, and the coating on polished stainless steel can resist the temperature of 900 ℃ at most and has good color retention capacity.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a high-temperature resistant coating is a two-component coating;
the component A comprises organic silicon resin, cadmium red, a dispersant, an auxiliary agent and a solvent, and the raw materials are mixed and dispersed to prepare the component A; wherein the mass content of inorganic components in the organic silicon resin is not less than 60 percent;
the component B is alcohol-soluble silica sol;
and mixing the component A and the component B to form the high-temperature-resistant coating.
As a further improvement of the invention, the component A comprises the following components in parts by mass: 30-50 parts of organic silicon resin, 10-30 parts of cadmium red, 20-35 parts of solvent, 5-38 parts of inorganic filler, 1-5 parts of dispersant, 0.1-1 part of assistant and 0-10 parts of other inorganic pigment.
As a further improvement of the invention, the inorganic filler is one or a mixture of more of mica, talcum powder, kaolin, silica powder, glass flake, precipitated barium sulfate and low-melting-point glass powder.
As a further improvement of the invention, the solvent is one or a mixture of more of propylene glycol methyl ether acetate, butyl acetate, ethyl acetate, butanol and xylene.
As a further improvement of the invention, the auxiliary agent comprises a leveling agent and a wetting agent.
As a further improvement of the invention, the component A and the component B are mixed according to the mass ratio of 3-6: 1 to form the high-temperature-resistant coating.
Other inorganic high-temperature resistant pigments can be added into the component A, and the other inorganic high-temperature resistant pigments are one or a mixture of more than one of titanium chromium brown, titanium nickel yellow, cobalt blue, cobalt green, copper chromium black and the like, and various special functional pigments such as high-temperature resistant pearlescent pigments and metal pigment blending color pastes.
The second object of the present invention is: a preparation method of a high-temperature-resistant coating is provided, and the method comprises the following steps:
preparing raw materials of a component A and a component B respectively;
secondly, preparing the component A, namely mixing and stirring the desolventized agent, the inorganic pigment, the dispersant and other auxiliary agents according to the proportion of the component A, adding high-temperature-resistant silicone resin, grinding at high speed in a grinder, dispersing until the fineness is less than or equal to 25 mu m, filtering and discharging to obtain the component A;
preparing the coating: and (3) mixing the component A and the component B according to the proportion of 3: 1-6: 1 at room temperature, uniformly stirring, and spraying for use, wherein the component A and the component B are used up within 24 hours.
A third object of the invention is: and providing a high-temperature-resistant coating which is formed by drying and curing the high-temperature-resistant coating.
A fourth object of the invention is: provides the application of the high-temperature resistant coating. The high-temperature-resistant coating is used as a stainless steel coating, and the stainless steel does not need to be subjected to sand blasting when the coating is sprayed.
The applicant researches and compares the cadmium red and the color change behavior thereof in the enamel sintering process, deduces that the high-temperature color loss behavior of the cadmium red in the organic silicon resin has a direct relation with the organic components in the organic silicon resin, and the most key for developing the red high-temperature resistance is to reduce the organic matter content in the resin. However, the problem of high-temperature color loss of cadmium red cannot be solved by simply selecting the silicon resin with higher inorganic content, and the problems that the brittleness of the coating is increased and the coating is easy to crack and peel under the high-temperature condition are also caused. After a plurality of experimental researches, the inventors find that the color loss phenomenon of cadmium red under a high-temperature condition is greatly improved by using two film-forming resins of organic silicon and alcohol-soluble silica sol and combining a proper proportion. Meanwhile, the combination of the two resins increases the adhesive force of the coating on the stainless steel substrate, the coating can resist 900 ℃ at the highest temperature when being coated on the surface of the stainless steel subjected to oil removal, degreasing and polishing, and the stainless steel does not need to be subjected to sand blasting in advance. The invention enriches the variety of the high-temperature resistant coating and obviously reduces the pretreatment cost of construction.
Drawings
FIG. 1 shows the color of the coating prepared in Experimental group 1 of the examples before and after being left at 900 ℃ for 30 min.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and should not be taken as limitations of the present invention.
Two silicone resins were selected in the examples: one is German MSE 100 silicone resin, the solid content is 100%, and the inorganic matter content is 68-72%; another 1053 pure silicone resin, available from Changzhou Yuan synthetic materials Co., Ltd, contains 47% of inorganic substances.
The wetting and leveling agent BYK-331 is purchased from Bike chemical, and the auxiliary agent has both wetting and leveling functions.
Dispersant AFCONA4550 was purchased from affkona adjuvant.
The rest raw materials are commercial products of industrial grade and can be purchased from commercial channels.
The method for detecting the performance of the coating is as follows:
hardness was determined according to GB/T1730-1993; the adhesive force is measured according to the GB/T9286-1998 method, and the high temperature resistance test method comprises the following steps: and (3) placing the coating in a muffle furnace at 900 ℃ for 30min, then taking out, naturally cooling, and observing whether the coating cracks, peels and fades so as to judge the high-temperature resistance of the coating.
Examples
(1) The preparation of the high-temperature resistant coating comprises the following components:
preparation of component A: according to the proportion shown in the following table 1, firstly, the solvent, the pigment and filler, the dispersant and the wetting and leveling agent are mixed and stirred, then the MSE 100 silicon resin or the 1053 pure silicon resin is added again, the mixture is ground by a high-speed dispersion machine until the particle size is less than or equal to 25 micrometers, and the mixture is filtered and packaged.
And B component: taking an industrial product as a raw material, adding 2% of deionized water according to the mass ratio, stirring uniformly, filtering and packaging.
TABLE 1 formulation of control group and experimental group
(2) Preparing a coating;
the A, B components are mixed according to a certain proportion, stirred evenly and filtered by a 100-mesh filter screen for spraying. The base material is a stainless steel base material which is polished by 240-mesh sand paper and subjected to soot blowing.
Control group 1:
directly spraying the component A on a polished stainless steel substrate, controlling the film thickness to be about 35 μm, carrying out flash drying at 50 ℃ for 10min, and then curing at 200 ℃ for 60 min.
Control group 2:
uniformly mixing the component A and the component B according to the mass ratio of 3:1, spraying the mixture on a polished stainless steel base material, controlling the film thickness to be about 35 mu m, carrying out flash drying at 50 ℃ for 10min, and then curing at 200 ℃ for 60 min.
Experimental group 1:
uniformly mixing the component A and the component B according to the mass ratio of 3:1, then spraying the mixture on a polished stainless steel base material, controlling the film thickness to be about 35 mu m, carrying out flash drying at 50 ℃ for 10min, and then curing at 200 ℃ for 60 min.
Experimental group 2:
the component A and the component B are uniformly mixed according to the mass ratio of 6:1, then the mixture is sprayed on a polished stainless steel base material, the film thickness is controlled to be about 35 mu m, after the mixture is flashed for 10min at 50 ℃, the mixture is cured for 60min at 200 ℃.
Experimental group 3:
uniformly mixing the component A and the component B according to the mass ratio of 5:1, then spraying the mixture on a polished stainless steel base material, controlling the film thickness to be about 35 mu m, carrying out flash drying at 50 ℃ for 10min, and then curing at 200 ℃ for 60 min.
Experimental group 4:
the component A and the component B are uniformly mixed according to the mass ratio of 4:1, then the mixture is sprayed on a polished stainless steel base material, the film thickness is controlled to be about 35 mu m, after the mixture is flashed for 10min at 50 ℃, the mixture is cured for 60min at 200 ℃.
TABLE 2 coating Properties of control and Experimental groups
As can be seen from Table 2 above, the discoloration phenomenon of cadmium red under high temperature conditions is greatly improved by using two film-forming resins, namely, organic silicon resin and silica sol, with inorganic content of more than 60%. Meanwhile, the combination of the two resins increases the adhesive force of the coating on the glass fiber reinforced plastic substrate, the coating is placed at 900 ℃ for 30min after the polished stainless steel surface is sprayed and cured, the coating does not crack and peel, and the high-temperature resistant coating prepared by only adopting organic silicon resin or the coating prepared by adopting silicon resin and silica sol with lower inorganic content is rapidly combusted, peeled and red fades under the condition.
The novel high-temperature-resistant coating has low pretreatment requirement on a base material and outstanding high-temperature resistance of a coating, solves the color loss phenomenon of cadmium red at high temperature to a great extent, and has wide application prospect.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. The high-temperature-resistant coating is characterized by being a two-component high-temperature-resistant coating;
the component A comprises organic silicon resin, cadmium red, a dispersant, an auxiliary agent and a solvent, and the raw materials are mixed and dispersed to prepare the component A; wherein the mass content of inorganic components in the organic silicon resin is not less than 60 percent;
the component B is alcohol-soluble silica sol;
and mixing the component A and the component B to form the high-temperature-resistant coating.
2. The high-temperature-resistant coating as claimed in claim 1, wherein the component A comprises the following components in parts by mass: 30-50 parts of organic silicon resin, 10-30 parts of cadmium red, 20-35 parts of solvent, 5-38 parts of inorganic filler, 1-5 parts of dispersant and 0.1-1 part of other auxiliary agents.
3. The high-temperature-resistant coating as claimed in claim 1, wherein the inorganic filler is one or more of mica, talcum powder, kaolin, silica powder, glass flake, precipitated barium sulfate and low-melting-point glass powder.
4. The high-temperature-resistant paint as claimed in claim 1, wherein the solvent is one or more of propylene glycol methyl ether acetate, butyl acetate, ethyl acetate, butanol and xylene.
5. The high temperature resistant coating of claim 1, wherein the additives comprise leveling agents and wetting agents.
6. The high temperature-resistant coating according to claim 1, wherein the alcohol-soluble silica sol is a methanol silica sol or an ethanol silica sol.
7. The high-temperature-resistant coating as claimed in claim 1, wherein the component A and the component B are mixed according to a mass ratio of 3-6: 1 to form the high-temperature-resistant coating.
8. A preparation method of a high-temperature-resistant coating is characterized by comprising the following steps:
mixing and stirring the solvent, the inorganic filler, the cadmium red, the dispersant and the auxiliary agent according to any one of claims 1 to 7, adding the organic silicon resin, grinding and dispersing in a grinder, filtering and discharging to obtain a component A;
and mixing the component A and the alcohol-soluble silica sol, and then uniformly stirring to obtain the coating.
9. The method as claimed in claim 8, characterized in that the dispersion is ground in a mill to a fineness of 25 μm or less.
10. A high-temperature-resistant coating, which is formed by drying and curing the high-temperature-resistant coating as claimed in any one of claims 1 to 7.
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| CN202010676791.5A CN111995949A (en) | 2020-07-14 | 2020-07-14 | High-temperature-resistant coating and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113384154A (en) * | 2021-07-12 | 2021-09-14 | 杭州老板电器股份有限公司 | Easily-cleaned inner container, production method thereof and cooking utensil |
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| CN1995250A (en) * | 2006-01-04 | 2007-07-11 | 北京国邦技术发展中心 | Thermostable heat-isolating coating and its preparation method |
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| CN105778577A (en) * | 2016-03-16 | 2016-07-20 | 安徽中益新材料科技有限公司 | Energy-storage and luminous ceramic coating and preparation method thereof |
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| CN110256961A (en) * | 2019-06-28 | 2019-09-20 | 杭州白熊科技有限公司 | Electric-heating coatings and its preparation method and application, electro-thermal coatings and electrothermal device |
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2020
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| US4499217A (en) * | 1981-02-02 | 1985-02-12 | Catalysts & Chemicals Industries, Co. Ltd. | Thermo-setting resinous liquid compositions |
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| CN101544855A (en) * | 2009-04-24 | 2009-09-30 | 景德镇陶瓷学院 | Environmental protecting multifunctional coating and its preparing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113384154A (en) * | 2021-07-12 | 2021-09-14 | 杭州老板电器股份有限公司 | Easily-cleaned inner container, production method thereof and cooking utensil |
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Application publication date: 20201127 |