CN102517547A - Method for plating aluminum film or aluminum-tin alloy film on surface of continuous aluminum rolling plate in vacuum gas phase sedimentation method - Google Patents
Method for plating aluminum film or aluminum-tin alloy film on surface of continuous aluminum rolling plate in vacuum gas phase sedimentation method Download PDFInfo
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Abstract
The invention belongs to the field of mirror finishing of aluminum rolling plates and particularly provides a method for plating an aluminum film or an aluminum-tin alloy film on the surface of a continuous aluminum rolling plate in a vacuum gas phase sedimentation method. The method comprises the following steps: substrate pretreatment, roller painting or spraying of a base coat, vacuum gas phase sedimentation plating of the aluminum film or the aluminum-tin alloy film and roller painting or spraying of a finishing coat. The method is high in production efficiency and good in film forming effect, and greatly reduces cost. Light reflection efficiency of a mirror plane plate obtained by the method is higher than 92%, and the method can be widely applied to architectural decoration, lamps and household appliance industry.
Description
Technical field
The invention belongs to the mirror finish field of aluminium roll bending, a kind of method for plating film on surface of continuous aluminium roll bending specifically is provided.
Background technology
Along with the development of economic technology, the application of aluminium plate is increasingly extensive, and especially the minute surface aluminium sheet is as a kind of high-end aluminium, by the fields such as upholstery, mechanical means, solar-powered heating generating that are applied to more and more widely.The treatment technology of surface of aluminum plate commonly used mainly is spraying, roller coat or anodic oxidation, with pursue surface of aluminum plate and different-effect.And the processing technology of minute surface aluminium sheet the most sophisticated at present mainly be mechanical polishing technology and chemical rightenning technology; And domesticly almost there is not sophisticated manufacturer at present; This technology is mainly producer's grasps such as SUMITOMO CHEMICAL, and domestic user also mainly obtains the source of goods through import.Technology of the present invention is mainly used in the processing of specular aluminium roll bending, also can be used for the processing of stainless steel mirror board.
The acquisition minute surface aluminium sheet commonly used at present or the method for mirror face stainless steel plate are the treatment process that mechanical polishing and electrochemical etching combine.Its principle is: during mechanical polishing; Polishing crop rotation high speed rotating on the polishing machine; The operator with polished product surface with suitable pressure by being pressed on the buff, at this moment because of rubbing effect produces high temperature, polished surface deformed easily and form one deck " affected layer ".Under the frictional force effect of rotating, some boss on surface is pressed on the one hand, or inserts the depression position after moving a segment distance.Thisly cut the protruding recessed flattening course of filling out, at full speed carry out repeatedly on a large scale, add that the light of rubbing paste turns usefulness into, the result just makes more coarse originally product surface, becomes level and smooth and light.
Product surface through mechanical polishing is very active, is very easy in airborne oxygen generation oxidizing reaction.So will obtain stable specular layer after the mechanical polishing just must be auxiliary with electrochemical etching.The principle of electrochemical etching is: chemical rightenning is to utilize aluminium and duraluminum to be produced on selectivity in acidity or the alkaline electrolyte solution from the dissolving effect; Flatten polishing product surface; To reduce the chemical process method of its surfaceness; Owing to the existence of the concentrated nitric acid in the chemical liquid or the vitriol oil, can make the bright aluminium lamination passivation on surface simultaneously, be able in the air stablize thereby be exposed to.The purity of aluminium and duraluminum has very big influence to the quality of chemical rightenning, and its purity is higher, quality of finish better, otherwise just poorer.Electrochemical etching is to adopt concise and to the point viscosity liquid film theory to carry out.
The Technology that mechanical polishing adds electrochemical etching technology production aluminium mirror board or stainless steel mirror board has following weak point: (1) is owing to the acquisition of mirror effect mainly obtains through the mechanical friction effect, thereby production efficiency is low, and energy consumption is high.(2) need use a large amount of concentrated nitric acids, the vitriol oil or SPA in the production process, quantity of wastewater effluent is big, pollutes serious relatively.(3) cost is high: the auxiliary industry average cost with the electrochemical etching technology of mechanical polishing is about 30 yuan/square meter.
The vacuum vapor deposition technology has been widely used in the surface treatment of plastic component at present, and main application fields is the extraneous adornment spare or the structural part of consumer electronics products such as mobile phone, digital camera.The vacuum vapor deposition technology is applied to the surface working of continuous aluminium roll bending and then obtains the specular aluminium roll bending also do not see relevant report.
Summary of the invention
To the deficiency of prior art, the invention provides a kind of method at continuous aluminium roll bending surface coating, this method production efficiency is high; Film-formation result is good; Cost descends significantly, and mirror board reflector efficiency＞92% through method of the present invention obtains can be widely used in architectural decoration.
Technical scheme of the present invention is:
The method of a kind of continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film or Sn-Al alloy film comprises following concrete steps:
(1) substrate pre-treatment: oil removing → washing → pickling oxide film dissolving → washing → oven dry; Said substrate is aluminium sheet or aluminium roll bending;
(2) roller coat or spraying bottom coating: pretreated substrate roller coat is perhaps sprayed one deck organic coating a, and adopting energy then is the ultraviolet light polymerization of 800-1200 milli Jiao/square centimeter, and 50 ℃-60 ℃ infrared rays baking 5min-8min is provided simultaneously;
The weight part of the main ingredient of said organic coating a is following: 30 parts-40 parts of single functionality epoxy resin, 20 parts-25 parts of difunctionality vinyl resins, 15 parts-20 parts of single functionality reactive thinners, 5 parts-10 parts of 1173 or 184 light triggers, 8 parts-10 parts of ethyl esters, 3 parts-5 parts of functional type auxiliary agents;
(3) vacuum vapor deposition plating aluminium film or Sn-Al alloy film: with substrate plated film in vacuum plating unit of first-class undercoat, the target that plated film adopts is the aluminum metal or the Sn-Al alloy of purity>=99.98%; The pressure-controlling of Vakuumkammer is 5 * 10
-3Below the Pa, vaporizer adopts boron nitride crucible;
(4) roller coat perhaps sprays finishing coat: the substrate roller coat behind aluminium plating film or Sn-Al alloy film perhaps sprays one deck organic coating b; Adopting energy then is the ultraviolet light polymerization of 600-1000 milli Jiao/square centimeter; And 50 ℃-60 ℃ infrared rays baking 5min-8min is provided simultaneously, get final product;
The weight part of the main ingredient of said organic coating b is following: acrylic resin modified 30 parts-40 parts of single functionality, 20 parts-25 parts of difunctionality vinyl resins, 10 parts-15 parts of difunctionality urethane acrylates, 10 parts-15 parts of single functionality reactive thinners, 4 parts-8 parts of 1173 or 184 light triggers, 5 parts-8 parts of ethyl esters, 3 parts-5 parts of functional type auxiliary agents.
The single functionality reactive thinner is LAURIC ACID 99 MIN methacrylic ester or iso-bornyl acrylate described in organic coating a and the organic coating b.Said functional type auxiliary agent is selected from second-hydroxyethyl methacrylic ester SULPHOSUCCINIC ACID ESTER, BYK371 flow agent, promotor 1270 or promotor 2325.
The pretreated concrete steps of the said substrate of step (1) are:
A) oil removing: with aluminium sheet or aluminium roll bending in chemical liquid oil removing 1-2 minute, temperature was controlled at 50 ℃-65 ℃; The prescription of chemical liquid is: sodium hydroxide 30-50 gram/L, and industrial detergent 0.5-1 milliliter/L, all the other are water;
B) washing: the aluminium flake behind the electrochemical deoiling or aluminium roll bending inserted in the warm water clean 35 ℃-45 ℃ of water temperatures, 20 seconds-30 seconds time;
C) pickling oxide film dissolving: the substrate after will washing is put into acidic solution and is removed zone of oxidation; Acidic solution is the salpeter solution of every liter of 250-300 milliliter, and the reaction times is controlled at 1min-3min;
D) washing: pickling substrate is later washed 20s-40s in 35 ℃-45 ℃ water;
E) oven dry: 50 ℃-70 ℃ baking 5min-10min, pre-treatment is accomplished.
The said primer thickness of step (2) is the 10-12 micron, and hardness of film reaches 0 grade for the thickness of aluminium more than 1H.
Said aluminium film of step (3) or Sn-Al alloy film thickness are the 0.5-1 micron, insulation resistance＞2M ohm, and minute surface is to reflecting rate＞92% of visible light.
The said finishing coat thickness of step (4) is the 6-10 micron, and hardness of film is more than 1H, and anti-bending reaches the 2T standard, and salt spray resistance reaches 48 hours no changes of the neutral 5%NaCl aqueous solution, and ultraviolet aging resistance reached more than 120 hours.
Step (4) is the plastics film that shields of plating one deck more afterwards.
Do further explanation and explanation in the face of the present invention down:
Vacuum plating unit according to the invention is existing evaporating coating equipment, like the shake ZHL-1800 type high vacuum thermal resistance evaporation coating equipment of magnificent vacuum machine ltd of Zhaoqing.
Single functionality reactive thinner among organic coating a according to the invention and the organic coating b is for existing thinner commonly used, like LAURIC ACID 99 MIN methacrylic ester, iso-bornyl acrylate etc.Said functional type auxiliary agent is an auxiliary agent commonly used on the market, as second-hydroxyethyl methacrylic ester SULPHOSUCCINIC ACID ESTER, German BYK company 371, the adhesion promoter 1270,2325 of Di Gao company etc.
The present invention is different from mechanical polishing commonly used at present and electrochemical etching technology fully.Aluminium sheet mirror finish technology commonly used at present; Must adopt mechanical polishing and electrochemical etching bonded method; Because mechanical polishing surface of aluminum plate later is very active, and the reflectance that pure mechanical polishing reaches is also not enough, must auxiliaryly obtain as bright as a sixpence surface with electrochemical etching; Make it reflectance and reach more than 95%, electrochemical etching also is a process that passivation is stable simultaneously.Through the Passivation Treatment of electrochemistry soup, the aluminium particulate on surface just is able to stable existence.The mirror board reflector efficiency that obtains through method of the present invention is generally at 92%-94%; Only a little bit poorer than adopting mechanical polishing and electrochemical etching bonded method; May limit the invention in the application of photovoltaic industry, but use material, this effect complete enough as architectural decoration; And operational path is simple, and cost significantly reduces.
Compared with prior art, advantage of the present invention is:
(1) because the acquisition of vacuum gas phase physical deposition principle is passed through in the acquisition of mirror effect, thereby production efficiency is high, and energy consumption is relatively low.Particularly aborning undercoat and finishing coat adopts UV-curing technology, makes the coating that only can accomplish undercoat or finishing coat about 5-7 minute, and production efficiency is very high.
(2) production process need not used concentrated nitric acid, the vitriol oil or the SPA of any component, and sewage discharge is very limited, and the traditional technology pollutant emission reduces more than 80% relatively.
(3) cost is low: the auxiliary industry average cost with the electrochemical etching technology of mechanical polishing is about 30 yuan/square meter, and the vacuum vapor deposition technology obtains the cost of mirror board and can be controlled in the 20 yuan/square meter.This shows that cost descends more than 30% significantly.
Embodiment
Below in conjunction with specific embodiment the present invention is done further explanation and explanation, it not is exhaustive that embodiment just enumerates.
Embodiment 1:
(1) substrate pre-treatment: oil removing → washing → pickling oxide film dissolving → washing → oven dry; Said substrate is an aluminium sheet;
A) oil removing: with the oil removing 2 minutes in chemical liquid of aluminium sheet or aluminium roll bending, temperature is controlled at 50 ℃; The prescription of chemical liquid is: sodium hydroxide 30 gram/L, industrial detergent are the not FLK-020 type degreaser of Shandong cut Science and Technology Ltd. production of Jinhua, and 0.5 milliliter/L, all the other are water;
B) washing: the aluminium flake behind the electrochemical deoiling or aluminium roll bending inserted in the warm water clean 40 ℃ of water temperatures, 20 seconds time;
C) pickling oxide film dissolving: the substrate after will washing is put into acidic solution and is removed zone of oxidation; Acidic solution is 250 milliliters every liter a hydrochloric acid soln, and the reaction times is controlled at 1min;
D) washing: pickling substrate is later washed 20s in 40 ℃ water;
E) oven dry: 60 ℃ of baking 7min, pre-treatment is accomplished.
(2) roller coat or spraying bottom coating: pretreated substrate roller coat is perhaps sprayed one deck organic coating a; 50 ℃ infrared rays baking 5min is provided; Adopting energy then is the ultraviolet light polymerization of 800 milli Jiao/square centimeters; Said primer thickness is 10 microns, and hardness of film reaches 0 grade for the sticking power of aluminium more than 1H.
The weight part of the main ingredient of said organic coating a is following: 30 parts of single functionality epoxy resin, 20 parts of difunctionality vinyl resins, single functionality reactive thinner are 15 parts of LAURIC ACID 99 MIN methacrylic esters, 7 parts of 1173 light triggers, 8 parts of ethyl esters, 12704 parts of promotor;
(3) vacuum vapor deposition plating aluminium film or Sn-Al alloy film: with substrate plated film in vacuum plating unit of first-class undercoat, the target that plated film adopts is that purity is 99.98% aluminum metal or Sn-Al alloy; The pressure-controlling of Vakuumkammer is 5 * 10
-3Pa, vaporizer adopts boron nitride crucible; Said aluminium film or Sn-Al alloy film thickness are 0.6 micron, insulation resistance＞2M ohm, and minute surface is 92.8% to the reflecting rate of visible light.
(4) roller coat perhaps sprays finishing coat: the substrate roller coat behind aluminium plating film or Sn-Al alloy film perhaps sprays one deck organic coating b, and 50 ℃ infrared rays baking 6min is provided, and adopting energy then is the ultraviolet light polymerization of 900 milli Jiao/square centimeters, gets final product;
The weight part of the main ingredient of said organic coating b is following: acrylic resin modified 30 parts of single functionality, 20 parts of difunctionality vinyl resins, 10 parts of difunctionality urethane acrylates, single functionality reactive thinner are that 10 parts of LAURIC ACID 99 MIN methacrylic esters, 5 parts of 1173 light triggers, 5 parts of ethyl esters, functional type auxiliary agent are 4 parts of BYK371 flow agents (German Bick chemical prodn).
Said finishing coat thickness is 8 microns, and hardness of film is more than the pencil 1H of import Mitsubishi, and sticking power is 0 grade, and coating is as clear as crystal.
The mirror board that obtains through this technology; The anti-bending of top coat and metal film layer reaches the 2T standard, and salt spray resistance reaches 48 hours no changes of the neutral 5%NaCl aqueous solution, and the high temperature and humidity test result is: following 48 hours no changes of 95% humidity and 65 degree celsius temperature conditions; Ultraviolet aging resistance reached more than 120 hours; Reflector efficiency is 92.8%, and cost is low, is about 18 yuan/square meter.
Embodiment 2:
(1) substrate pre-treatment: oil removing → washing → pickling oxide film dissolving → washing → oven dry; Said substrate is the aluminium roll bending;
A) oil removing: with the oil removing 2 minutes in chemical liquid of aluminium sheet or aluminium roll bending, temperature is controlled at 55 ℃; The prescription of chemical liquid is: sodium hydroxide 45 gram/L, industrial detergent are the not 1 milliliter/L of FLK-010 type efficient degreasing powder of Shandong cut Science and Technology Ltd. production of Jinhua, and all the other are water;
B) washing: the aluminium flake behind the electrochemical deoiling or aluminium roll bending inserted in the warm water clean 40 ℃ of water temperatures, 30 seconds time;
C) pickling oxide film dissolving: the substrate after will washing is put into acidic solution and is removed zone of oxidation; Acidic solution is 300 milliliters every liter a hydrochloric acid soln, and the reaction times is controlled at 2min;
D) washing: pickling substrate is later washed 40s in 40 ℃ water;
E) oven dry: 65 ℃ of baking 6min, pre-treatment is accomplished.
(2) roller coat or spraying bottom coating: pretreated substrate roller coat is perhaps sprayed one deck organic coating a, 55 ℃ infrared rays baking 7min is provided, adopting energy then is the ultraviolet light polymerization of 900 milli Jiao/square centimeters; Said primer thickness is 12 microns, and hardness of film reaches 0 grade for the sticking power of aluminium more than 1H.
The weight part of the main ingredient of said organic coating a is following: 40 parts of single functionality epoxy resin, 25 parts of difunctionality vinyl resins, single functionality reactive thinner are that 20 parts of iso-bornyl acrylates, 9 parts of 1173 light triggers, 9 parts of ethyl esters, functional type auxiliary agent are 3.5 parts of 2325 type adhesion promoters (production of Di Gao company);
(3) vacuum vapor deposition plating aluminium film or Sn-Al alloy film: with substrate plated film in vacuum plating unit of first-class undercoat, the target that plated film adopts is that purity is 99.98% aluminum metal or Sn-Al alloy; The pressure-controlling of Vakuumkammer is 5 * 10
-3Pa, vaporizer adopts boron nitride crucible; Said aluminium film or Sn-Al alloy film thickness are 0.8 micron, insulation resistance＞2M ohm, and minute surface is 93.5% to the reflecting rate of visible light.
(4) roller coat perhaps sprays finishing coat: the substrate roller coat behind aluminium plating film or Sn-Al alloy film perhaps sprays one deck organic coating b, and 55 ℃ infrared rays baking 7min is provided, and adopting energy then is the ultraviolet light polymerization of 900 milli Jiao/square centimeters, gets final product;
The weight part of the main ingredient of said organic coating b is following: acrylic resin modified 40 parts of single functionality, 25 parts of difunctionality vinyl resins, 15 parts of difunctionality urethane acrylates, single functionality reactive thinner are that 15 parts of iso-bornyl acrylates, 6 parts of 1173 light triggers, 6 parts of ethyl esters, functional type auxiliary agent are 4 parts of BYK333 flow agents (German Bick chemical prodn).
Said finishing coat thickness is 10 microns, more than the pencil 1H of hardness of film import Mitsubishi, and 0 grade of sticking power, paint film is as clear as crystal.
(5) use mechanical peritonaeum equipment to cover PE film, product is shielded.
Through the mirror board that this technology obtains, the anti-bending of top coat and metal film layer reaches the 2T standard; Salt spray resistance reaches 48 hours no changes of the neutral 5%NaCl aqueous solution; The high temperature and humidity test result is: following 48 hours no changes of 95% humidity and 65 degree celsius temperature conditions; Ultraviolet aging resistance reached more than 120 hours; Mirror board reflector efficiency behind this plated film is 93.5%, and cost is low, is about 19 yuan/square meter.
Claims (8)
1. the method for continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film or Sn-Al alloy film is characterized in that, comprises following concrete steps:
(1) substrate pre-treatment: oil removing → washing → pickling oxide film dissolving → washing → oven dry; Said substrate is aluminium sheet or aluminium roll bending;
(2) roller coat or spraying bottom coating: pretreated substrate roller coat is perhaps sprayed one deck organic coating a, and adopting energy then is the ultraviolet light polymerization of 800-1200 milli Jiao/square centimeter, and 50 ℃-60 ℃ infrared rays baking 5min-8min is provided simultaneously;
The weight part of the main ingredient of said organic coating a is following: 30 parts-40 parts of single functionality epoxy resin, 20 parts-25 parts of difunctionality vinyl resins, 15 parts-20 parts of single functionality reactive thinners, 5 parts-10 parts of 1173 or 184 light triggers, 8 parts-10 parts of ethyl esters, 3 parts-5 parts of functional type auxiliary agents;
(3) vacuum vapor deposition plating aluminium film or Sn-Al alloy film: with substrate plated film in vacuum plating unit of first-class undercoat, the target that plated film adopts is the aluminum metal or the Sn-Al alloy of purity>=99.98%; The pressure-controlling of Vakuumkammer is 5 * 10
-3Below the Pa, vaporizer adopts boron nitride crucible;
(4) roller coat perhaps sprays finishing coat: the substrate roller coat behind aluminium plating film or Sn-Al alloy film perhaps sprays one deck organic coating b; Adopting energy then is the ultraviolet light polymerization of 600-1000 milli Jiao/square centimeter; And 50 ℃-60 ℃ infrared rays baking 5min-8min is provided simultaneously, get final product;
The weight part of the main ingredient of said organic coating b is following: acrylic resin modified 30 parts-40 parts of single functionality, 20 parts-25 parts of difunctionality vinyl resins, 10 parts-15 parts of difunctionality urethane acrylates, 10 parts-15 parts of single functionality reactive thinners, 4 parts-8 parts of 1173 or 184 light triggers, 5 parts-8 parts of ethyl esters, 3 parts-5 parts of functional type auxiliary agents.
2. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film, it is characterized in that the pretreated concrete steps of the said substrate of step (1) are:
A) oil removing: with aluminium sheet or aluminium roll bending in chemical liquid oil removing 1-2 minute, temperature was controlled at 50 ℃-65 ℃; The prescription of chemical liquid is: sodium hydroxide 30-50 gram/L, and industrial detergent 0.5-1 milliliter/L, all the other are water;
B) washing: the aluminium flake behind the electrochemical deoiling or aluminium roll bending inserted in the warm water clean 35 ℃-45 ℃ of water temperatures, 20 seconds-30 seconds time;
C) pickling oxide film dissolving: the substrate after will washing is put into acidic solution and is removed zone of oxidation; Acidic solution is the salpeter solution of every liter of 250-300 milliliter, and the reaction times is controlled at 1min-3min;
D) washing: pickling substrate is later washed 20s-40s in 35 ℃-45 ℃ water;
E) oven dry: 50 ℃-70 ℃ baking 5min-10min, pre-treatment is accomplished.
3. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film, it is characterized in that the said primer thickness of step (2) is the 10-12 micron, hardness of film reaches 0 grade for the thickness of aluminium more than 1H.
4. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film; It is characterized in that; Said aluminium film of step (3) or Sn-Al alloy film thickness are the 0.5-1 micron, insulation resistance＞2M ohm, and minute surface is to reflecting rate＞92% of visible light.
5. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film; It is characterized in that; The said finishing coat thickness of step (4) is the 6-10 micron, and hardness of film is more than 1H, and anti-bending reaches the 2T standard; Salt spray resistance reaches 48 hours no changes of the neutral 5%NaCl aqueous solution, and ultraviolet aging resistance reached more than 120 hours.
6. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film, it is characterized in that step (4) is the plastics film that shields of plating one deck more afterwards.
7. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film; It is characterized in that the single functionality reactive thinner is LAURIC ACID 99 MIN methacrylic ester or iso-bornyl acrylate described in organic coating a and the organic coating b.
8. according to the method for said continuous aluminium roll bending surface vacuum vapour deposition process plating aluminium film of claim 1 or Sn-Al alloy film; It is characterized in that functional type auxiliary agent described in organic coating a and the organic coating b is selected from second-hydroxyethyl methacrylic ester SULPHOSUCCINIC ACID ESTER, BYK371 flow agent, promotor 1270 or promotor 2325.
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| CN109097738B (en) * | 2018-08-13 | 2020-12-18 | 长沙中海瑞超硬材料技术有限公司 | Ceramic mirror and manufacturing method thereof |
| CN109136864A (en) * | 2018-08-21 | 2019-01-04 | 烟台正海磁性材料股份有限公司 | A method of in magnet steel surface vacuum coated with aluminum tin composite coating |
| CN109136864B (en) * | 2018-08-21 | 2021-02-02 | 烟台正海磁性材料股份有限公司 | Method for vacuum coating of aluminum-tin composite coating on surface of magnetic steel |
| CN111604248A (en) * | 2020-06-17 | 2020-09-01 | 江苏倍科装饰材料科技有限公司 | Production process of color-coated aluminum coil |
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Address after: 410600, Hunan province Changsha city Ningxiang County Zhu Luo Xiang Luo Xiang Village Group 28 Applicant after: Changsha Yantian Paint Technology Co., Ltd. Address before: 410600, Hunan province Changsha city Ningxiang County Zhu Luo Xiang Applicant before: Changsha Yantian Paint Technology Co., Ltd. |
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