CN110903748A - Elastic anti-corrosive polyaspartic acid coating and preparation method thereof - Google Patents
Elastic anti-corrosive polyaspartic acid coating and preparation method thereof Download PDFInfo
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- CN110903748A CN110903748A CN201911282788.9A CN201911282788A CN110903748A CN 110903748 A CN110903748 A CN 110903748A CN 201911282788 A CN201911282788 A CN 201911282788A CN 110903748 A CN110903748 A CN 110903748A
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/02—Polyureas
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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
- C09D5/08—Anti-corrosive 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- 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
- C08K2003/3045—Sulfates
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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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention discloses a polyaspartic acid elastic anticorrosive paint which comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, a defoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent. The invention also discloses a preparation method of the polyaspartic acid elastic anticorrosive paint. The elastic anticorrosive paint of polyaspartic ester, which is prepared by using the base material mainly comprising polyaspartic ester resin and the curing agent mainly comprising isocyanate resin, has the advantages of super-long ultraviolet resistance, excellent elasticity, good low-temperature performance and excellent wear resistance. The paint disclosed by the invention has excellent mechanical strength, ageing resistance, corrosion resistance and the like, so that a steel structure can resist sand storm and ocean corrosion.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a polyaspartic acid elastic anticorrosive coating and a preparation method thereof.
Background
With the development of society and the progress of technology, the construction of bridges and dams is increased year by year, but wind sand and ocean have serious corrosion damage to the steel structures of the bridges and dams, and the service life of the bridges and dams is greatly shortened. Therefore, the paint for steel structures used for bridge and dam construction has high requirements on mechanical strength, ageing resistance, corrosion resistance, wear resistance and other properties, and the whole coating structure has enough toughness to resist wind and sand impact.
Therefore, it is highly desirable to provide a coating material for steel structures, which has excellent mechanical strength, aging resistance, corrosion resistance, etc. to solve the technical problem of corrosion of steel structures of bridge dams by sand wind, oceans, etc.
Disclosure of Invention
The invention aims to provide the polyaspartic acid elastic anticorrosive paint with excellent mechanical strength, ageing resistance, corrosion resistance and other properties, which has ultralong ultraviolet resistance, excellent elasticity, good low-temperature performance and excellent wear resistance, meets the requirement of no adhesion at a high temperature of 80 ℃, and has certain stain resistance and solvent resistance.
In order to achieve the purpose, the invention provides a polyaspartic acid elastic anticorrosive paint which comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, an antifoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent.
Further, the hydroxyl content of the polyaspartic acid ester resin is 5-10%.
Further, the solid content of the polyaspartic acid ester resin is more than 99.5%.
Further, the functionality of the hyperbranched modified polyester resin is 2.5-3.5, and the hydroxyl value is 210-240 mgKOH/g.
Further, the solid content of the hyperbranched modified polyester resin is more than 99.5%, and the water content is less than 0.3%.
Further, the rubber type of the nano core-shell rubber particles is polybutadiene rubber.
Further, the content of effective components of the nano core-shell rubber particles is 30-40%, and the viscosity is less than 15000mPa & s (50 ℃).
Further, the solid resin of the isocyanate resin has an isocyanate group (NCO) content of 15-30%.
Further, the isocyanate resin is an aliphatic isocyanate resin.
Further, the component A comprises the following components in percentage by weight:
further, the component B comprises the following components in percentage by weight:
80-90% of isocyanate resin;
10-20% of a second solvent.
Further, the weight ratio of the component A to the component B is 2.5-4: 1, mixing and using.
A preparation method of polyaspartic acid elastic anticorrosive paint comprises the following steps:
preparation of the component A:
weighing polyaspartic acid ester resin, hyperbranched modified polyester resin, a first solvent, a thixotropic agent and a defoaming agent, sequentially adding the weighed materials into a high-speed dispersion machine for mixing, adding titanium dioxide and barite, dispersing at the rotating speed of 1800-2200 r/min until the fineness is 30-50 mu m, adding nano core-shell rubber particles and a dispersing aid, and dispersing at the rotating speed of 500-700 r/min until the materials are uniform;
preparation of the component B:
the isocyanate resin and the second solvent are separately contained in another clean container for uniform dispersion.
Further, the component A and the component B are packaged independently.
Further, before coating, the weight ratio of the component A to the component B is 2.5-4: 1, mixing and using.
Further, in the preparation step of the component A, the preparation raw materials comprise the following components in percentage by weight:
further, in the preparation step of the component B, the preparation raw materials comprise the following components in percentage by weight:
80-90% of isocyanate resin;
10-20% of a second solvent.
Further, the first solvent and the second solvent may be the same solvent or different solvents.
In an embodiment of the present invention, the first solvent is trimethylbenzene.
In an embodiment of the present invention, the second solvent is trimethylbenzene.
Further, the specific gravity of the trimethylbenzene is 0.8-0.9.
The materials used in the present invention are commercially available materials.
In the embodiment of the invention, the polyaspartic acid ester resin is the polyaspartic acid ester resin with the brand (or model) of F524 produced by Feiyang company. The hydroxyl content of the polyaspartic acid ester resin is 5-10%.
In the embodiment of the invention, the hyperbranched modified polyester resin is produced by DeKun corporation and has a mark (or model) of 2509.
In the embodiment of the invention, the first solvent and the second solvent are trimethyl benzene which is produced by the Qilu petrochemical company and used for polyurethane grade and has the specific gravity of 0.8-0.9.
In the examples of the present invention, the thixotropic agent used was BENTON SD-2 type thixotropic agent manufactured by Hamins corporation.
In the embodiment of the invention, the defoaming agent is a BYK-052 defoaming agent produced by Bick company.
In the embodiment of the invention, the titanium dioxide is rutile titanium dioxide with the brand (or model) of R902 produced by DuPont company. The specific gravity of the titanium dioxide is 3.8-4.3.
In the embodiment of the invention, the barite is high-quality barite powder with the brand (or model) of B20 produced by Wilton company.
In the embodiment of the invention, the nano core-shell rubber particles are nano core-shell rubber particles produced by Bell chemical company, and the brand (or model) is MX.
In the embodiment of the invention, the dispersing auxiliary adopts a functional auxiliary produced by Bick company, and the brand (or model) is BYK-163.
In the embodiment of the invention, the isocyanate resin is aliphatic isocyanate resin with the trade mark (or model) of N3300 produced by Bayer company.
The invention has the beneficial effects that:
the elastic anti-corrosive polyaspartic ester coating can be used as a novel functional coating to prepare a soft-feel coating with excellent hand feeling, and the elastic anti-corrosive polyaspartic ester coating is a low-crosslinking-density system mainly based on a linear molecular structure, has high flexibility and elasticity, and endows a coating with excellent wear resistance, impact resistance and elongation.
The elastic anticorrosive paint of polyaspartic ester, which is prepared from the base material mainly comprising polyaspartic ester resin and the curing agent mainly comprising isocyanate resin, has the advantages of super-long ultraviolet resistance, excellent elasticity, good low-temperature performance, excellent wear resistance, higher construction solid content, long construction period and the like, can meet the requirement of no adhesion at high temperature of 80 ℃, and has certain stain resistance and solvent resistance. The invention adopts the base material with good acid resistance and alkali resistance, the surface of the coating has high glossiness and good smoothness, and the linear saturated polyaspartic acid ester with hydroxyl can provide excellent elasticity and good adhesive force and has good corrosion resistance to steel structures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a polyaspartic acid elastic anticorrosive paint, which comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, a defoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent.
The hydroxyl content of the polyaspartic acid ester resin is 5-10%. The solid content of the polyaspartic acid ester resin is more than 99.5 percent. The functionality of the hyperbranched modified polyester resin is 2.5-3.5, and the hydroxyl value is 210-240 mgKOH/g. The solid content of the hyperbranched modified polyester resin is more than 99.5 percent, and the water content is less than 0.3 percent. The rubber type of the nano core-shell rubber particles is polybutadiene rubber. The content of effective components of the nano core-shell rubber particles is 30-40%, and the viscosity is less than 15000mPa & s (50 ℃). The solid resin of the isocyanate resin contains 15-30% of isocyanate group (NCO).
The component A comprises the following components in percentage by weight:
the component B comprises the following components in percentage by weight:
80-90% of isocyanate resin;
10-20% of a solvent.
The weight ratio of the component A to the component B is 2.5-4: 1, mixing and using.
A preparation method of polyaspartic acid elastic anticorrosive paint comprises the following steps:
preparation of the component A:
weighing polyaspartic acid ester resin, hyperbranched modified polyester resin, a first solvent, a thixotropic agent and a defoaming agent according to the weight percentage, sequentially adding the weighed materials into a high-speed dispersion machine for mixing, adding titanium dioxide and barite, dispersing the materials at the rotating speed of 1800-2200 r/min until the fineness is 30-50 mu m, adding nano core-shell rubber particles and a dispersing auxiliary agent, and dispersing the materials at the rotating speed of 500-700 r/min until the materials are uniform to obtain a component A;
preparation of the component B:
and (3) according to the weight percentage, putting the isocyanate resin and the second solvent into a clean container to be uniformly dispersed to obtain the component B.
The component A and the component B are independently packaged; before coating, the weight ratio of the component A to the component B is 2.5-4: 1, mixing and using.
Example 2
The embodiment provides a polyaspartic acid elastic anticorrosive paint, which comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, a defoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent.
The hydroxyl content of the polyaspartic acid ester resin is 5-10%. The solid content of the polyaspartic acid ester resin is more than 99.5 percent. The functionality of the hyperbranched modified polyester resin is 2.5-3.5, and the hydroxyl value is 210-240 mgKOH/g. The solid content of the hyperbranched modified polyester resin is more than 99.5 percent, and the water content is less than 0.3 percent. The rubber type of the nano core-shell rubber particles is polybutadiene rubber. The content of the effective components of the nano core-shell rubber particles is 40%, and the viscosity is less than 15000mPa & s (50 ℃). The solid resin of the isocyanate resin contains 15-30% of isocyanate group (NCO).
The component A comprises the following components in percentage by weight:
the component B comprises the following components in percentage by weight:
80% of isocyanate resin;
and 20% of a second solvent.
A preparation method of polyaspartic acid elastic anticorrosive paint comprises the following steps:
preparation of the component A:
weighing polyaspartic acid ester resin, hyperbranched modified polyester resin, a first solvent, a thixotropic agent and a defoaming agent according to the weight percentage, sequentially adding the weighed materials into a high-speed dispersion machine for mixing, adding titanium dioxide and barite, dispersing the materials at the rotating speed of 2200r/min until the fineness is 30 mu m, adding nano core-shell rubber particles and a dispersing aid, and dispersing the materials at the rotating speed of 700r/min until the materials are uniform to obtain a component A;
preparation of the component B:
and (3) according to the weight percentage, putting the isocyanate resin and the second solvent into a clean container to be uniformly dispersed to obtain the component B.
The component A and the component B are independently packaged; before coating, the component A and the component B are mixed according to the weight ratio of 4: 1, mixing and using.
Example 3
The embodiment provides a polyaspartic acid elastic anticorrosive paint, which comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, a defoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent.
The hydroxyl content of the polyaspartic acid ester resin is 5-10%. The solid content of the polyaspartic acid ester resin is more than 99.5 percent. The functionality of the hyperbranched modified polyester resin is 2.5-3.5, and the hydroxyl value is 210-240 mgKOH/g. The solid content of the hyperbranched modified polyester resin is more than 99.5 percent, and the water content is less than 0.3 percent. The rubber type of the nano core-shell rubber particles is polybutadiene rubber. The content of the effective components of the nano core-shell rubber particles is 30 percent, and the viscosity is less than 15000 mPa.s (50 ℃). The solid resin of the isocyanate resin contains 15-30% of isocyanate group (NCO).
The component A comprises the following components in percentage by weight:
the component B comprises the following components in percentage by weight:
85% of isocyanate resin;
15% of a second solvent.
A preparation method of polyaspartic acid elastic anticorrosive paint comprises the following steps:
preparation of the component A:
weighing polyaspartic acid ester resin, hyperbranched modified polyester resin, a first solvent, a thixotropic agent and a defoaming agent according to the weight percentage, sequentially adding the weighed materials into a high-speed dispersion machine for mixing, adding titanium dioxide and barite, dispersing at the rotating speed of 1800r/min until the fineness is 50 mu m, adding nano core-shell rubber particles and a dispersing aid, and dispersing at the rotating speed of 500r/min until the materials are uniform to obtain a component A;
preparation of the component B:
and (3) according to the weight percentage, putting the isocyanate resin and the second solvent into a clean container to be uniformly dispersed to obtain the component B.
The component A and the component B are independently packaged; before coating, the weight ratio of the component A to the component B is 3.3: 1, mixing and using.
Example 4
The embodiment provides a polyaspartic acid elastic anticorrosive paint, which comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, a defoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent.
The hydroxyl content of the polyaspartic acid ester resin is 5-10%. The solid content of the polyaspartic acid ester resin is more than 99.5 percent. The functionality of the hyperbranched modified polyester resin is 2.5-3.5, and the hydroxyl value is 210-240 mgKOH/g. The solid content of the hyperbranched modified polyester resin is more than 99.5 percent, and the water content is less than 0.3 percent. The rubber type of the nano core-shell rubber particles is polybutadiene rubber. The content of effective components of the nano core-shell rubber particles is 30-40%, and the viscosity is less than 15000mPa & s (50 ℃). The solid resin of the isocyanate resin contains 15-30% of isocyanate group (NCO).
The component A comprises the following components in percentage by weight:
the component B comprises the following components in percentage by weight:
isocyanate resin 90%;
10% of a second solvent.
A preparation method of polyaspartic acid elastic anticorrosive paint comprises the following steps:
preparation of the component A:
weighing polyaspartic acid ester resin, hyperbranched modified polyester resin, a first solvent, a thixotropic agent and a defoaming agent according to the weight percentage, sequentially adding the weighed materials into a high-speed dispersion machine for mixing, adding titanium dioxide and barite, dispersing at the rotating speed of 2000r/min until the fineness is 40 mu m, adding nano core-shell rubber particles and a dispersing aid, and dispersing at the rotating speed of 600r/min until the materials are uniform to obtain a component A;
preparation of the component B:
and (3) according to the weight percentage, putting the isocyanate resin and the second solvent into a clean container to be uniformly dispersed to obtain the component B.
The component A and the component B are independently packaged; before coating, the weight ratio of the component A to the component B is 2.9: 1, mixing and using.
Test example 1
The performances of the coatings obtained by coating the polyaspartic acid elastic anticorrosive coatings prepared in the embodiments 2 to 4 of the invention are respectively detected, and the detected performance items and the corresponding detection methods are shown in table 1:
TABLE 1
| Detecting items | Detection method |
| Appearance of the product | Visualization |
| Fineness of fineness | GB/T 6753 |
| Adhesion force | ISO 4624 |
| Artificially accelerated aging | ISO 11341 |
| Weather resistance | Outdoor solarization |
| Wear resistance | GB/T 23988 |
| Elongation percentage | GB 50164 |
| High temperature resistance | GB/T 24243.2 |
| Low temperature resistance | GB/T 24243.1 |
| Moisture and heat resistance | GB/T 1740 |
The elastic anti-corrosive coatings of polyaspartic acid prepared in examples 2 to 4 were tested according to the testing method shown in table 1, and the results of the tests were observed and recorded, and are shown in table 2:
TABLE 2
As is clear from Table 1, the coating obtained by the present invention has a uniform appearance without defects, and is excellent in chemical and mechanical properties, and thus the coating of the present invention is excellent in properties.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The elastic anti-corrosion coating of polyaspartic acid is characterized by comprising a component A and a component B, wherein the component A comprises polyaspartic acid ester resin, hyperbranched modified polyester resin, a thixotropic agent, a defoaming agent, titanium dioxide, barite, nano core-shell rubber particles, a dispersing agent and a first solvent; the component B comprises isocyanate resin and a second solvent.
2. The elastic polyaspartic acid anticorrosive paint of claim 1, wherein the polyaspartic acid ester resin has a hydroxyl group content of 5-10%.
3. The elastic anti-corrosive polyaspartic acid coating as claimed in claim 1, wherein the functionality of the hyperbranched modified polyester resin is 2.5 to 3.5, and the hydroxyl value is 210 to 240 mgKOH/g.
4. The polyaspartic acid elastic anticorrosive paint as claimed in claim 1, wherein the rubber type of the nano core-shell rubber particles is polybutadiene rubber.
5. The elastic polyaspartic acid anticorrosive paint of claim 1 or 4, wherein the content of active ingredients in the nano core-shell rubber particles is 30-40%, and the viscosity is less than 15000mPa · s (50 ℃).
6. The elastic polyaspartic acid anticorrosive paint of claim 1, wherein the solid resin of the isocyanate resin contains 15 to 30% of isocyanate groups.
7. The elastic anti-corrosive polyaspartic acid coating as claimed in claim 1, wherein the component A comprises the following components in percentage by weight:
8. the elastic anti-corrosive polyaspartic acid coating as claimed in claim 1, wherein the component B comprises, by weight:
80-90% of isocyanate resin;
10-20% of a second solvent.
9. The elastic polyaspartic acid anticorrosive paint as claimed in claim 7 or 8, wherein the weight ratio of the component A to the component B is 2.5-4: 1, mixing and using.
10. The preparation method of the polyaspartic acid elastic anticorrosive paint according to any one of claims 1 to 9, characterized by comprising the following steps:
preparation of the component A:
weighing polyaspartic acid ester resin, hyperbranched modified polyester resin, a first solvent, a thixotropic agent and a defoaming agent, sequentially adding the weighed materials into a high-speed dispersion machine for mixing, adding titanium dioxide and barite, dispersing the materials at a rotating speed of 1800-2200 r/min until the fineness is 30-50 mu m, adding nano core-shell rubber particles and a dispersing aid, and dispersing the materials uniformly at a rotating speed of 500-700 r/min to obtain a component A;
preparation of the component B:
putting isocyanate resin and a second solvent in a clean container for uniform dispersion to obtain a component B;
wherein the A component and the B component are packaged independently.
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| CN113683947A (en) * | 2021-08-30 | 2021-11-23 | 黄山中邦孚而道涂料有限公司 | High-wear-resistance weather-resistant corrosion-resistant coating for locomotive, and preparation method and application thereof |
| CN113683947B (en) * | 2021-08-30 | 2022-03-08 | 黄山中邦孚而道涂料有限公司 | High-wear-resistance weather-resistant corrosion-resistant coating for locomotive, and preparation method and application thereof |
| CN113956765A (en) * | 2021-12-06 | 2022-01-21 | 深圳市润麒麟科技发展有限公司 | Anti-radiation and anti-corrosion coating and preparation method thereof |
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Application publication date: 20200324 |