CN116179051A - Beverage can inner wall anti-corrosion coating and preparation method thereof - Google Patents
Beverage can inner wall anti-corrosion coating and preparation method thereof Download PDFInfo
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- CN116179051A CN116179051A CN202310205839.8A CN202310205839A CN116179051A CN 116179051 A CN116179051 A CN 116179051A CN 202310205839 A CN202310205839 A CN 202310205839A CN 116179051 A CN116179051 A CN 116179051A
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Classifications
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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
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
-
- 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
-
- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
-
- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
Abstract
The invention discloses an anti-corrosion coating for the inner wall of a beverage can and a preparation method thereof, wherein the anti-corrosion coating for the inner wall of the beverage can comprises the following raw materials in parts by weight: 35-45 parts of resin, 1-3 parts of surface promoter, 10-20 parts of auxiliary agent, 3-5 parts of anti-corrosion pigment, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, 20-35 parts of deionized water, 1-2 parts of dispersing agent, 1-2 parts of curing agent and 10-30 parts of solvent.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to an anti-corrosion coating for the inner wall of a beverage can and a preparation method thereof.
Background
The tin can is a metal packaging can manufactured by adopting tin plate and thin aluminum plate, is mainly used for packaging various canned foods and beverages, and the prior beverages are various in variety, including acidic beverages, weak acidic beverages, alkaline beverages and weak alkaline beverages, most of the canned foods are provided with high-salt or high-sugar or acid-alkali substances, the inner wall surface of the tin can is extremely easy to corrode, the taste of the product is affected, food hazard is easy to occur, and when the inner wall of the tin can is subjected to corrosion prevention treatment, most of the prior tin can only be a single coating layer, a corrosion-prevention and corrosion-prevention safety network cannot be effectively formed after the coating layer is coated, and local corrosion and other conditions are easy to occur.
Disclosure of Invention
The invention mainly aims to provide an anti-corrosion coating for the inner wall of a beverage can and a preparation method thereof, and aims to provide a coating for providing an anti-corrosion safety network and avoid corrosion influence of an object in the can on the can.
In order to achieve the above purpose, the invention provides an anti-corrosion coating for the inner wall of a beverage can, which comprises the following raw materials in parts by weight: 35-45 parts of resin, 1-3 parts of surface promoter, 10-20 parts of auxiliary agent, 3-5 parts of anti-corrosion pigment, 1-2 parts of defoamer, 1-2 parts of flatting agent, 20-35 parts of deionized water, 1-2 parts of dispersing agent, 1-2 parts of curing agent and 10-30 parts of solvent.
Optionally, the raw materials comprise the following components in parts by weight: 40 parts of resin, 1 part of surface promoter, 15 parts of auxiliary agent, 3 parts of anti-corrosion pigment, 1 part of defoamer, 1 part of flatting agent, 25 parts of deionized water, 1 part of dispersing agent, 1 part of curing agent and 20 parts of solvent.
Optionally, the resin includes at least one of a phenolic resin and an epoxy resin.
Optionally, the dispersant comprises sodium polyacrylate.
Optionally, the curing agent comprises at least one of phenolic amine, polyamine, aliphatic amine, alicyclic amine.
Optionally, the auxiliary comprises at least one of an ammonia neutralizer, a water dispersible isocyanate, an acid catalyst, an amino resin, and an organic anhydride.
Optionally, the anti-corrosion pigment comprises at least one of modified aluminum tripolyphosphate, zinc phosphate, titanium dioxide.
Optionally, the defoamer comprises a silicone-based defoamer.
Optionally, the solvent comprises one or a combination of more of ethanol, isopropanol and butanol.
The invention also provides a preparation method of the beverage can inner wall anti-corrosion coating, which comprises the following steps:
s1, mixing a solvent, deionized water, a dispersing agent and resin, heating, stirring and dissolving to obtain a mixed solution;
s2, adding an auxiliary agent into the mixed solution, and stirring and mixing to obtain aqueous colloid;
s3, adding anti-corrosion pigment and surface promoter into the aqueous colloid, and stirring and mixing to obtain thick solution;
and S4, adding a defoaming agent, a leveling agent and a curing agent into the thick solution to obtain the anti-corrosion coating on the inner wall of the beverage can.
The paint prepared by the invention has strong adhesive force to metal, has the advantages of heat resistance, alkali resistance, corrosion resistance and the like, and particularly forms an effective corrosion protection network on the inner wall surface of the iron tank under the cooperation of corrosion protection materials, dispersing agents and resin, thereby improving the corrosion resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an anti-corrosion coating for the inner wall of a beverage can, which comprises the following raw materials in parts by weight: 35-45 parts of resin, 1-3 parts of surface promoter, 10-20 parts of auxiliary agent, 3-5 parts of anti-corrosion pigment, 1-2 parts of defoamer, 1-2 parts of flatting agent, 20-35 parts of deionized water, 1-2 parts of dispersing agent, 1-2 parts of curing agent and 10-30 parts of solvent.
The beverage can inner wall anti-corrosion coating provided by the invention comprises resin, a curing agent, a surface accelerator, an auxiliary agent, an anti-corrosion pigment, a leveling agent, a defoaming agent, deionized water, a dispersing agent and a solvent, does not contain toxic raw materials such as benzene and the like, is safe and nontoxic, forms an anti-corrosion network after being coated on the inner wall surface of an iron can, has extremely strong anti-corrosion property and anti-rust property, and has the advantages of simple and quick preparation method and high production efficiency.
Further, in this embodiment, the corrosion-resistant coating layer on the inner wall of the beverage can comprises the following raw materials in parts by weight: 40 parts of resin, 1 part of surface promoter, 15 parts of auxiliary agent, 3 parts of anti-corrosion pigment, 1 part of defoamer, 1 part of flatting agent, 25 parts of deionized water, 1 part of dispersing agent, 1 part of curing agent and 20 parts of solvent.
In this embodiment, the resin includes at least one of phenolic resin and epoxy resin, the epoxy resin is an important thermosetting plastic, and is widely used in applications such as adhesives and coatings, and has the advantages of chemical resistance, strong paint film adhesion, good heat resistance and the like, the phenolic resin is a synthetic plastic, colorless or yellow brown transparent solid, heat resistance, flame resistance, water resistance, alkali resistance, oil resistance, corrosion resistance and the like, and the scheme can include one or two of the above resins.
In this embodiment, the dispersing agent is used for mixing the pigment, so as to solve the problems of difficult dispersion and low fluidity of the pigment, and is helpful for increasing the concentration of the solution, so as to ensure that the anti-corrosion pigment is uniformly distributed in the mixed solution during mixing.
In this embodiment, further, the curing agent includes at least one of phenolic amine, polyamine, aliphatic amine and alicyclic amine, and the curing agent not only can play a role in physical drying, promote quick drying of the coating, shorten drying time, but also can play a role in chemical curing, and the curing agent can react with resin in combination, so that the hardness, brightness and adhesiveness of the coating in film formation are improved, the chemical stability and corrosion resistance of the coating are improved, and the film is full, fine, smooth, elastic, wear-resistant and not prone to scratch.
In this embodiment, the auxiliary agent is added to improve the product performance of the coating, and in this embodiment, the auxiliary agent includes at least one of ammonia neutralizer, water-dispersible isocyanate, acid catalyst, amino resin and organic anhydride, and the auxiliary agent in the invention can improve the quality and yield of the product in the production process of the anticorrosive coating on the inner wall of the beverage can.
In this embodiment, the anti-corrosion pigment includes at least one of modified aluminum tripolyphosphate, zinc phosphate and titanium dioxide, the modified tripolyphosphate ion in the modified aluminum tripolyphosphate can form chelate with various metal ions, an excellent purification film is formed on the surface of the coated object, the anti-corrosion pigment has extremely strong inhibition effect on corrosion of steel, light metal and the like, the usage amount in the coating is small, the unit cost is low, the adaptability is wide, the zinc phosphate is a white nontoxic anti-corrosion pigment, is a new generation of nontoxic and pollution-free anti-corrosion pigment with excellent anti-corrosion effect, and can effectively replace the traditional anti-corrosion pigment containing heavy metal lead and chromium. Preferably, the above three are contained.
Further, in this embodiment, the defoamer includes an organosilicon defoamer, including a polyether modified organosilicon defoamer, and by adding the defoamer, the corrosion-resistant coating on the inner wall of the beverage can reduce or eliminate foam during production and is not reactive with the raw material system.
In order to dissolve the raw materials such as the resin, it is necessary to add a solvent, particularly an organic solvent, which in this embodiment includes one or a combination of ethanol, isopropanol, and butanol, and after the above solvent is added, the raw materials such as the resin may be completely dissolved and become liquid.
The invention further provides a preparation method of the anti-corrosion coating on the inner wall of the beverage can, which comprises the following steps:
s1, mixing a solvent, deionized water, a dispersing agent and resin, heating, stirring and dissolving to obtain a mixed solution;
in the step, the solvent, deionized water and the dispersing agent are mixed with the resin, and the mixture is stirred uniformly by a stirrer at the rotation speed of 400r/min at the temperature of 70-110 ℃ to obtain a mixed solution, wherein the stirring time is 20-40min until the resin is completely dissolved.
S2, adding an auxiliary agent into the mixed solution, and stirring and mixing to obtain aqueous colloid;
in the step, the auxiliary agent is added into the mixed solution, and the mixture is continuously stirred for 1 to 2 hours at the rotating speed of 600 to 800r/min under the action of a stirrer, so as to obtain the aqueous colloid.
S3, adding anti-corrosion pigment and surface promoter into the aqueous colloid, and stirring and mixing to obtain thick solution;
in this step, an anti-corrosive pigment and a surface accelerator were added to the aqueous colloid, and the mixture was stirred and dispersed in a stirrer at a rotational speed of 1500r/min until the mixture was uniform, and a thick solution was obtained.
And S4, adding a defoaming agent, a leveling agent and a curing agent into the thick solution to obtain the anti-corrosion coating on the inner wall of the beverage can.
In the step, after the defoaming agent, the leveling agent and the curing agent are added into the thick solution, the stirrer is stirred at the rotating speed of 500r/min until the materials are uniformly mixed, and then the mixture is kept stand for 1.5 hours, so that the anti-corrosion coating on the inner wall of the beverage can is obtained.
The invention firstly mixes solvent, deionized water, dispersing agent and resin, heats and stirs to dissolve, and gets mixed liquor, and adds auxiliary agent into mixed liquor, improves the adhesiveness of coating and metal base material, improves the crosslinking density of coating film, gets aqueous colloid after stirring and mixing, then heats anti-corrosion pigment and surface accelerator, improves the anti-corrosion and film-forming properties of coating, and under the action of dispersing agent, the anti-corrosion pigment can be evenly distributed in solution, and the anti-corrosion properties are improved under the coating film with high crosslinking density, finally adds defoamer, curing agent and leveling agent, and prepares the anti-corrosion coating of inner wall of beverage can.
The following description of the embodiments of the present invention will be presented in further detail with reference to the examples, which should be understood as being merely illustrative of the present invention and not limiting.
Example 1
An anticorrosive coating for the inner wall of a beverage can comprises the following raw materials in parts by weight: 35 parts of epoxy resin, 1 part of phenolic amine, 2 parts of surface promoter, 10 parts of ammonia neutralizer, 1 part of modified aluminum tripolyphosphate, 1 part of polyether modified organosilicon defoamer, 1 part of flatting agent, 20 parts of deionized water, 1 part of sodium polyacrylate and 20 parts of ethanol.
Example 2
An anticorrosive coating for the inner wall of a beverage can comprises the following raw materials in parts by weight: 45 parts of phenolic resin, 2 parts of polyamine, 3 parts of surface promoter, 20 parts of acid catalyst, 1 part of zinc phosphate, 1 part of titanium pigment, 2 parts of polyether modified organosilicon defoamer, 2 parts of flatting agent, 35 parts of deionized water and 2 parts of sodium polyacrylate
30 parts of butanol.
Example 3
(1) Preparing an anti-corrosion coating on the inner wall of a beverage can by using the raw materials in the embodiment 1, namely weighing 200g of ethanol, 200g of deionized water, 10g of sodium polyacrylate and 350g of epoxy resin, mixing, heating, stirring and dissolving to obtain a mixed solution;
(2) Adding 100g of ammonia neutralizer into the mixed solution, and stirring and mixing to obtain aqueous colloid;
(3) Adding 10g of modified aluminum tripolyphosphate and 20g of surface promoter into the aqueous colloid, and stirring and mixing to obtain a thick solution;
(4) And adding 10g of polyether modified organosilicon defoamer, 10g of flatting agent and 10g of phenolic amine into the thick solution to obtain the corrosion-resistant coating on the inner wall of the beverage can.
Example 4
(1) Preparing an anti-corrosion coating on the inner wall of a beverage can by using the raw materials in the embodiment 2, namely weighing 300g of butanol, 350g of deionized water, 20g of sodium polyacrylate and 450g of phenolic resin, mixing, heating, stirring and dissolving to obtain a mixed solution;
(2) Adding 200g of acid catalyst into the mixed solution, and stirring and mixing to obtain aqueous colloid;
(3) Adding 10g of titanium dioxide, 10g of zinc phosphate and 30g of surface accelerator into the aqueous colloid, and stirring and mixing to obtain a thick solution;
(4) And adding 20g of polyether modified organosilicon defoamer, 20g of flatting agent and 20g of polyamine into the thick solution to obtain the corrosion-resistant coating on the inner wall of the beverage can.
Comparative example 1
Step (2) was not performed, and the other steps were the same as in example 3.
Comparative example 2
Step (3) was not performed, and the other steps were the same as in example 4.
Test method and results
The properties of the anticorrosive coatings on the inner walls of the beverage cans prepared in examples 3 to 4 and comparative examples 1 to 2 according to the present invention were examined, respectively, to obtain Table 1.
Table 1 table for testing properties of corrosion protection coatings on inner walls of beverage cans
From the above, it is evident from the study parameters of examples 3 to 4 and comparative examples 1 to 2 that the coatings prepared in examples 3 to 4 all have good adhesion, acid resistance, alkali resistance and abrasion resistance, which means that the anticorrosive coating on the inner wall of the beverage can prepared in the present invention has good adhesion, acid resistance, alkali resistance and abrasion resistance, and the coating prepared in comparative example 1 has poor adhesion, acid resistance, alkali resistance and abrasion resistance, and the coating prepared in comparative example 2 has poor adhesion and abrasion resistance, and has poor acid resistance and alkali resistance, which means that the anticorrosive pigment can improve the acid resistance of the coating.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An anticorrosive coating for the inner wall of a beverage can is characterized by comprising the following raw materials in parts by weight: 35-45 parts of resin, 1-3 parts of surface promoter, 10-20 parts of auxiliary agent, 3-5 parts of anti-corrosion pigment, 1-2 parts of defoamer, 1-2 parts of flatting agent, 20-35 parts of deionized water, 1-2 parts of dispersing agent, 1-2 parts of curing agent and 10-30 parts of solvent.
2. The corrosion protection coating for the inner wall of a beverage can according to claim 1, comprising the following raw materials in parts by weight: 40 parts of resin, 1 part of surface promoter, 15 parts of auxiliary agent, 3 parts of anti-corrosion pigment, 1 part of defoamer, 1 part of flatting agent, 25 parts of deionized water, 1 part of dispersing agent, 1 part of curing agent and 20 parts of solvent.
3. The beverage can inner wall corrosion protection coating of claim 1 wherein the resin comprises at least one of a phenolic resin and an epoxy resin.
4. The beverage can inner wall corrosion protection coating of claim 1 wherein the dispersant comprises sodium polyacrylate.
5. The beverage can inner wall corrosion protection coating of claim 1 wherein the curing agent comprises at least one of phenolic amine, polyamine, aliphatic amine, alicyclic amine.
6. The beverage can inner wall corrosion protection coating of claim 1 wherein the auxiliary agent comprises at least one of an ammonia neutralizer, a water dispersible isocyanate, an acid catalyst, an amino resin, and an organic acid anhydride.
7. The beverage can inner wall corrosion protection coating of claim 1 wherein the corrosion protection pigment comprises at least one of modified aluminum tripolyphosphate, zinc phosphate, titanium dioxide.
8. The beverage can inner wall corrosion protection coating of claim 1 wherein the defoamer comprises a silicone-based defoamer.
9. The beverage can inner wall corrosion protection coating of claim 1 wherein the solvent comprises one or a combination of ethanol, isopropanol, butanol.
10. The preparation method of the anti-corrosion coating on the inner wall of the beverage can is characterized by comprising the following steps of:
s1, mixing a solvent, deionized water, a dispersing agent and resin, heating, stirring and dissolving to obtain a mixed solution;
s2, adding an auxiliary agent into the mixed solution, and stirring and mixing to obtain aqueous colloid;
s3, adding anti-corrosion pigment and surface promoter into the aqueous colloid, and stirring and mixing to obtain thick solution;
and S4, adding a defoaming agent, a leveling agent and a curing agent into the thick solution to obtain the anti-corrosion coating on the inner wall of the beverage can.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310205839.8A CN116179051A (en) | 2023-03-06 | 2023-03-06 | Beverage can inner wall anti-corrosion coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310205839.8A CN116179051A (en) | 2023-03-06 | 2023-03-06 | Beverage can inner wall anti-corrosion coating and preparation method thereof |
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| CN116179051A true CN116179051A (en) | 2023-05-30 |
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| CN101935491A (en) * | 2009-06-29 | 2011-01-05 | 苏州Ppg包装涂料有限公司 | Metal packaging coating for foods |
| CN103122201A (en) * | 2012-12-12 | 2013-05-29 | 孙才清 | Inner iron printing paint for food packaging |
| CN103409035A (en) * | 2013-07-05 | 2013-11-27 | 蚌埠飞浦科技包装材料有限公司 | Special paint for food can and preparation method thereof |
| CN104371490A (en) * | 2014-11-07 | 2015-02-25 | 蚌埠飞浦科技包装材料有限公司 | Primer coating for inner wall of food can and preparation method of primer coating |
| CN104403493A (en) * | 2014-11-07 | 2015-03-11 | 蚌埠飞浦科技包装材料有限公司 | Food can interior wall white paint and preparation method thereof |
| CN107964323A (en) * | 2017-09-14 | 2018-04-27 | 江苏扬瑞新型材料股份有限公司 | A kind of easy-to-draw cover sheet coating |
| CN110982382A (en) * | 2019-12-16 | 2020-04-10 | 苏州市多彩涂料有限公司 | High-corrosion-resistance coating and preparation process thereof |
| CN115710449A (en) * | 2022-11-30 | 2023-02-24 | 江苏扬瑞新材料有限公司 | Amino-resin-free aqueous internal spray coating and preparation method thereof |
-
2023
- 2023-03-06 CN CN202310205839.8A patent/CN116179051A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935491A (en) * | 2009-06-29 | 2011-01-05 | 苏州Ppg包装涂料有限公司 | Metal packaging coating for foods |
| CN103122201A (en) * | 2012-12-12 | 2013-05-29 | 孙才清 | Inner iron printing paint for food packaging |
| CN103409035A (en) * | 2013-07-05 | 2013-11-27 | 蚌埠飞浦科技包装材料有限公司 | Special paint for food can and preparation method thereof |
| CN104371490A (en) * | 2014-11-07 | 2015-02-25 | 蚌埠飞浦科技包装材料有限公司 | Primer coating for inner wall of food can and preparation method of primer coating |
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| CN107964323A (en) * | 2017-09-14 | 2018-04-27 | 江苏扬瑞新型材料股份有限公司 | A kind of easy-to-draw cover sheet coating |
| CN110982382A (en) * | 2019-12-16 | 2020-04-10 | 苏州市多彩涂料有限公司 | High-corrosion-resistance coating and preparation process thereof |
| CN115710449A (en) * | 2022-11-30 | 2023-02-24 | 江苏扬瑞新材料有限公司 | Amino-resin-free aqueous internal spray coating and preparation method thereof |
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