CN112778890A - Water-based base material, water-based paint and powder coating repairing method - Google Patents
Water-based base material, water-based paint and powder coating repairing method Download PDFInfo
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- CN112778890A CN112778890A CN202011618758.3A CN202011618758A CN112778890A CN 112778890 A CN112778890 A CN 112778890A CN 202011618758 A CN202011618758 A CN 202011618758A CN 112778890 A CN112778890 A CN 112778890A
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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
- C09D175/04—Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/005—Repairing damaged coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- 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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
-
- 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
-
- 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a water-based base material which comprises the following raw materials in parts by mass: water-based resin, wetting agent, anti-settling agent, ethanol and water; the water-based paint comprises the following raw materials in parts by weight: the above aqueous binder and powder coating. A method of repairing a powder coating comprising the steps of: mixing and stirring the powder coating and the water-based base material to form a water-based coating; coating or spraying the water-based paint on the repair area of the powder coating, and then waiting for the surface of the repair coating to be dried; polishing and flattening the repairing coating by using sand paper; and baking and curing the repairing coating by adopting hot air. The water-based paint can be prepared by mixing the existing powder paint and a water-based base material, can be directly repaired locally, avoids the trouble of specially preparing a liquid repairing paint, and is simple and convenient, low in cost and completely matched in performance and color.
Description
Technical Field
The invention relates to the technical field of powder coating, in particular to a water-based base material, a water-based paint and a powder coating repairing method.
Background
With the enhancement of global Environmental protection consciousness, powder coating has the advantages of economy, high efficiency, Environmental protection, Energy Saving and the like (often called 4E: Economical, effective, Environmental, Energy Saving), so that the powder coating is developed rapidly, more and more liquid coating is continuously replaced by the powder coating, and good Environmental protection benefit and economic benefit are brought. In fact, the development of powder coatings has been accompanied by the replacement of liquid coatings by powder coatings, referred to as "paint-to-powder". With the continuous progress of powder coating technology and powder coating technology, especially the more and more strict national environmental protection policy in recent years, the process of changing paint into powder is greatly accelerated.
The situation that a local coating on the surface of a workpiece coated by powder is damaged by collision often occurs in the processes of transportation and installation, and the traditional method is to find a liquid repair paint which is prepared by a liquid paint supplier and has the same color as the powder coating for field repair. The method for repairing the powder coating by adopting the liquid repair paint has the following disadvantages that firstly, the liquid coating is usually cured in an air-drying mode, and is difficult to be completely matched with the powder coating cured at high temperature in color, luster, mechanical efficiency, chemical performance and the like, so that the quality problem is often caused; secondly, manufacturers for providing the powder coating do not usually produce the liquid coating, and need to find special manufacturers for the liquid coating for extremely small quantities of refinish paint, so that the color mixing, proofing, production, ordering, transportation and the like are troublesome, most of the refinish paints are extremely small in repairing quantity, the quantity of the refinish paint required is extremely small, the corresponding process is complicated and extremely high in cost, and the operation is often impossible; thirdly, the use of liquid refinishing paint also has safety and environmental protection problems.
With the increasing popularization of powder coating, nearly 200 million tons of powder coating are produced every year in China, and the problem of repairing after local coating is damaged is a very wide problem. How to find a quick, simple, low-cost and constant-performance powder coating repairing method is a topic with great application value.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the water-based base material, the water-based paint and the repairing method of the powder coating are provided to solve the problems of high cost, inconvenience and unreliable repairing quality of the existing powder coating during local repairing.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect:
the water-based base material comprises the following raw materials in parts by mass:
aqueous resin: 10-30 parts;
wetting agent: 0.5-2 parts;
anti-settling agent: 0.05-1.5 parts;
ethanol: 0-80 parts;
water: 0-90 parts.
Further, the aqueous resin adopts: one of polyurethane water-based resin, acrylic water-based resin, polyester water-based resin or epoxy water-based resin.
In a second aspect:
the water-based paint comprises the following raw materials in parts by weight:
aqueous base material: 50-80 parts;
the water-based base material adopts the water-based base material; and
powder coating: 20-50 parts.
Further, the particle size of the powder coating is 5-30 microns.
Further, the powder coating is one of polyester powder coating, polyurethane powder coating, polyester epoxy mixed powder coating, epoxy powder coating or PVDF fluorocarbon powder coating.
In a third aspect:
a method of repairing a powder coating comprising the steps of:
step S01, mixing and stirring the powder coating and the water-based base material to form a water-based coating;
step S02, brushing or spraying the water-based paint on the repair area of the powder coating, and then waiting for the surface of the repair coating to be dried;
step S03, polishing and flattening the repair coating by using sand paper;
and step S04, baking and curing the repair coating by hot air.
The invention has the beneficial effects that:
the water-based paint can be directly repaired locally, avoids the trouble of specially preparing liquid repair paint, is simple and convenient, has low cost, and completely matches the performance and the color.
Detailed Description
The repair by using the existing powder coating is to solve the problems of coating and baking firstly.
The coating is that firstly, the existing powder coating needs to be prepared into water-based coating which can be used for repairing, firstly, water-based base material is needed, the water-based base material is matched with the existing powder coating to prepare water-based suspension, and the suspension is sprayed by a small brush or a miniature spray gun.
The present invention focuses on how to prepare a liquid suspension using existing powder coatings for spraying using a conventional air gun. The powder coating is a mixture of polymer resin and pigment, is insoluble in water, has a relatively large specific gravity and is easy to settle in water. How to solve the problem of no sedimentation of powder is the key point that powder coating can not be used for repairing.
Another problem is the curing of powder coatings; regardless of the manner in which the application is accomplished, powder coatings require relatively high temperatures to complete the cure. The huge workpiece cannot be re-baked, and many products are installed and applied on the site without heating condition at all. Therefore, finding a simple, low-cost and anywhere applicable curing method is also the focus of the solution.
The existing powder coating mainly comprises polyester powder coating, polyurethane powder coating, polyester epoxy mixed powder coating, epoxy powder coating and PVDF powder coating; four water-based binders with high compatibility with the water-based binders are developed, namely a polyurethane water-based binder, an acrylic water-based binder, a polyester water-based binder and an epoxy water-based binder; the following examples are given to illustrate the present invention
Example one
The water-based base material comprises the following raw materials in parts by mass:
aqueous resin: 10-30 parts; the water-based resin is the main composition of the water-based base material, and can be partially dissolved with the powder coating with the help of a wetting agent to form a suspension.
Wetting agent: 0.5-2 parts; wetting agents are amphoteric surfactants which help to disperse and wet the powder coating with the aqueous resin, and oily powder coatings are more easily suspended in solution after being coated with the aqueous resin.
Anti-settling agent: 0.05-1.5 parts; the anti-settling agent can be used for preserving the prepared water-based paint for a long time, so that the particles can be kept for a long time without settling or agglomeration after settling.
Ethanol: 0-80 parts; the ethanol acts as a solvent, dissolving and diluting the resin. The ethanol is easier to volatilize than water, and can be added when quick drying is needed.
Water: 0-90 parts. The water acts as a solvent, dissolving and diluting the resin.
Optionally, the water-based resin is polyurethane water-based resin, and the prepared water-based base material is polyurethane water-based base material; the product model of the polyurethane waterborne resin is WD-551 Japanese DIC waterborne polyurethane;
the water-based resin is acrylic water-based resin, and the prepared water-based base material is acrylic water-based base material; the acrylic waterborne resin product is Joncryl 678 from BASF corporation.
The water-based resin is polyester water-based resin, and the prepared water-based base material is polyester water-based base material; the product model of the polyester water-based resin is Japanese shin-Etsu MD-1500.
The water-based resin is epoxy water-based resin, and the prepared water-based base material is epoxy water-based base material.
The epoxy water-based resin product is EPlKOTE6520-WH-53A water-based epoxy resin in Hansen Mi picture (original shell)
The water-based base material of the embodiment has good compatibility with the powder particles, can enable the powder particles to suspend in the water-based resin, is not easy to settle, and provides guarantee for repairing the powder coating.
The following table 1 shows the concrete sampling of the aqueous binder using the polyurethane aqueous resin, and the components of the acrylic aqueous resin, the epoxy aqueous resin, and the polyester aqueous resin may be referred to the polyurethane aqueous resin.
TABLE 1 Components of aqueous base
Example two
Based on the water-based base material of the first embodiment, the powder coating is matched to prepare the water-based coating of the embodiment;
the water-based paint comprises the following raw materials in parts by weight:
aqueous base material: 50-80 parts;
powder coating: 20-50 parts.
Optionally, the powder coating is one of a polyester powder coating, a polyurethane powder coating, a polyester epoxy mixed powder coating, an epoxy powder coating and a PVDF fluorocarbon powder coating.
The polyester powder coating comprises the following components:
the polyurethane powder coating comprises the following components:
the polyester epoxy mixed powder coating comprises the following components:
the epoxy powder coating comprises the following components: a
The PVDF fluorocarbon powder coating comprises the following components:
in the embodiment, the particle size of the powder coating is 5-30 microns, and the powder coating belongs to an ultra-fine powder coating; the particle size is preferably in the range of 15-25 microns. The finer the particle size of the powder, the easier it is to suspend because the surface area is multiplied and the weight of the particles is multiplied after the particle size is reduced.
The particle size of the selected polyester powder coating is 15 microns;
the particle size of the selected polyester epoxy mixed powder coating is 15 microns;
the particle size of the selected polyurethane powder coating is 15 microns;
the particle size of the selected epoxy powder coating is 15 microns;
ultrafine powder with the particle size of 17 microns is selected for the PVDF fluorocarbon powder coating;
in this example, the concentration of the aqueous coating material prepared was different depending on the ratio of the powder coating material to the aqueous base material, and if the repair was brushed with a brush, the concentration of the powder was much higher, while the content was much lower when sprayed with an air gun. The approximate range of brushing is 30% -50%, while the approximate range of spraying is 20% -40%.
TABLE 2 Components of aqueous base
The water-based paint of this example, after mixing with various powder paints, was well compatible with the powder particles, did not settle out of the powder, and did not conflict with the powder paint curing during curing.
EXAMPLE III
Repairing the powder coating by adopting the water-based paint prepared in the second embodiment;
case one
Repair using polyurethane powder and polyurethane water-based resin
A method of repairing a powder coating comprising the steps of:
step S01, mixing and stirring polyurethane powder and a polyurethane water-based base material to form a water-based paint;
step S02, brushing or spraying the water-based paint on the repair area of the powder coating, and then waiting for the surface of the repair coating to be dried; selecting by brushing or spraying according to the actual concentration of the polyurethane powder, and brushing the polyurethane powder with the content ranging from 30% to 50%; spraying the polyurethane powder with the content of 20-40%;
step S03, after the characters are dried by the spraying sample plate, the repairing coating is polished to be smooth by abrasive paper;
and step S04, baking and curing the repair coating by hot air. Specifically, the hot air blower is used for carrying out local baking and curing at the temperature of 200-230 ℃.
The repairing effect of the case that the surface is flat, smooth and glossy and the color is basically consistent with the surface of other powder coatings is obtained.
Case two
In contrast to case one, polyester powder coatings and aqueous polyurethane resins were used.
The obtained repair coating has a smooth surface, and the luster and the color of the repair coating are basically consistent with those of other powder coating surfaces.
Case three
Unlike case one, a mixed powder coating of polyurethane water-borne resin and polyester epoxy was used;
the obtained repair coating has a smooth surface, and the luster and the color of the repair coating are basically consistent with those of other powder coating surfaces.
Case four
Unlike case one, a polyurethane waterborne resin and a PVDF fluorocarbon powder coating were used; the baking temperature of the powder coating panels was 230 deg.C/15 minutes.
The obtained repair coating has a smooth surface, and the luster and the color of the repair coating are basically consistent with those of other powder coating surfaces.
Case five
Unlike case one, acrylic waterborne and polyester powder coatings were used;
the surface is smooth and glossy, and the color is basically consistent with the surface of other powder coatings.
Case six
Unlike case five, a hybrid powder coating of acrylic waterborne and polyester epoxy;
the surface is smooth and glossy, and the color is basically consistent with the surface of other powder coatings.
Case seven
Different from the fifth case, the acrylic waterborne resin and the PVDF fluorocarbon powder coating
The surface is smooth and glossy, and the color is basically consistent with the surface of other powder coatings.
According to the repairing method, the powder coating is prepared into the aqueous suspension by the aqueous coating, electrostatic spraying equipment is not needed after the powder coating is changed into the liquid, coating can be carried out only by a brush or a miniature air spray gun, and the coating is repaired more conveniently, quickly and simply.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. The water-based base material is characterized by comprising the following raw materials in parts by mass:
aqueous resin: 10-30 parts;
wetting agent: 0.5-2 parts;
anti-settling agent: 0.05-1.5 parts;
ethanol: 0-80 parts;
water: 0-90 parts.
2. The aqueous base according to claim 1, wherein,
the water-based resin adopts: one of polyurethane water-based resin, acrylic water-based resin, polyester water-based resin or epoxy water-based resin.
3. The water-based paint is characterized by comprising the following raw materials in parts by mass:
aqueous base material: 50-80 parts;
the aqueous base stock adopts the aqueous base stock of any one of claims 1-2; and
powder coating: 20-50 parts.
4. The aqueous coating material according to claim 3,
the particle size of the powder coating is 5-30 microns.
5. The aqueous coating material according to claim 3,
the powder coating is one of polyester powder coating, polyurethane powder coating, polyester epoxy mixed powder coating, epoxy powder coating or PVDF fluorocarbon powder coating.
6. A method of repairing a powder coating, comprising the steps of:
step S01, mixing and stirring the powder coating and the water-based base material to form a water-based coating;
step S02, brushing or spraying the water-based paint on the repair area of the powder coating, and then waiting for the surface of the repair coating to be dried;
step S03, polishing and flattening the repair coating by using sand paper;
and step S04, baking and curing the repair coating by hot air.
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| CN202011618758.3A CN112778890A (en) | 2020-12-30 | 2020-12-30 | Water-based base material, water-based paint and powder coating repairing method |
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| CN202011618758.3A CN112778890A (en) | 2020-12-30 | 2020-12-30 | Water-based base material, water-based paint and powder coating repairing method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1202914A (en) * | 1995-11-03 | 1998-12-23 | 巴斯福涂料股份公司 | Aqueous powder paint dispersions |
| US6296903B1 (en) * | 1997-07-01 | 2001-10-02 | Basf Coatings Ag | Aqueous coating powder dispersion, method for the production and use of said dispersion |
| CN109663716A (en) * | 2018-11-02 | 2019-04-23 | 山西大学 | A kind of aqueous coating process of powdery paints |
| CN109749552A (en) * | 2018-12-19 | 2019-05-14 | 万华化学集团股份有限公司 | A kind of aqueous damping coating and its application in automotive field |
-
2020
- 2020-12-30 CN CN202011618758.3A patent/CN112778890A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1202914A (en) * | 1995-11-03 | 1998-12-23 | 巴斯福涂料股份公司 | Aqueous powder paint dispersions |
| US6296903B1 (en) * | 1997-07-01 | 2001-10-02 | Basf Coatings Ag | Aqueous coating powder dispersion, method for the production and use of said dispersion |
| CN109663716A (en) * | 2018-11-02 | 2019-04-23 | 山西大学 | A kind of aqueous coating process of powdery paints |
| CN109749552A (en) * | 2018-12-19 | 2019-05-14 | 万华化学集团股份有限公司 | A kind of aqueous damping coating and its application in automotive field |
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Application publication date: 20210511 |
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