CN110882880A - Coating process of tinplate - Google Patents
Coating process of tinplate Download PDFInfo
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- CN110882880A CN110882880A CN201911201204.0A CN201911201204A CN110882880A CN 110882880 A CN110882880 A CN 110882880A CN 201911201204 A CN201911201204 A CN 201911201204A CN 110882880 A CN110882880 A CN 110882880A
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- tinplate
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- 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
- B05D7/14—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 to metal, e.g. car bodies
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
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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
- C09D161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09D161/32—Modified amine-aldehyde condensates
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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
- 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
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
-
- 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
- B05D2504/00—Epoxy polymers
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- 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
- B05D2518/00—Other type of polymers
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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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
Abstract
The invention discloses a coating process of tinplate, and relates to the technical field of tinplate processing. The technical key points are as follows: the method comprises the following steps: (1) pretreatment: firstly, soaking tinplate in 75% alcohol solution for 5-10min to remove oil stains and impurities on the surface of the tinplate, and drying the tinplate by using hot air at 70-100 ℃ after soaking; (2) coating: coating the coating on the surface of the tinplate, and forming a layer of film on the surface of the tinplate after air blast drying; (3) coating treatment: washing the surface of the film with ultrapure water for 10-15min, drying at normal temperature, and rolling; the coating comprises the following components in parts by weight: bisphenol a epoxy resin: 200-300 parts; epoxy chloropropane: 150-250 parts; ethylene diamine: 1-6 parts; methyl etherified melamine resin: 200 portions and 250 portions; ethylene glycol butyl ether: 300-400 parts; carrier-nano silver: 0.5-2 parts. By the formula and the coating process, the tinplate has good sterilization and antibacterial capabilities.
Description
Technical Field
The invention relates to the technical field of tinplate processing, in particular to a coating process of tinplate.
Background
Tinplate, also known as tin-plated iron, is a common name for tin-plated steel sheet, and refers to a cold-rolled low-carbon steel sheet or strip with commercial pure tin plated on both sides, which combines the strength and formability of steel and the corrosion resistance, tin weldability and beautiful appearance of tin into one material, and has the characteristics of corrosion resistance, no toxicity, high strength and good ductility.
An inner layer iron printing coating and an iron printing method are disclosed in the Chinese patent with the publication number of CN103122203B, wherein the inner layer iron printing coating comprises bisphenol A, epichlorohydrin and a catalyst; an amino resin crosslinking agent; a solvent; wax powder. The curing time of the inner layer metal printing coating prepared by the formula is only 25-120s, and the inner layer metal printing coating can be continuously printed and coated and has good corrosion resistance. Tinplate is generally used for packaging food such as beverages, and the above-mentioned coating material can impart good corrosion resistance to tinplate, but cannot impart good antibacterial properties to tinplate, and when food such as drinks with openings is not eaten, it rapidly deteriorates.
Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a coating process of tinplate, which can improve the fresh-keeping capacity of the tinplate and enable the tinplate packaging material to have good sterilization and antibacterial properties.
In order to achieve the purpose, the invention provides the following technical scheme:
a coating process of tinplate comprises the following steps:
(1) pretreatment: firstly, soaking tinplate in 75% alcohol solution for 5-10min to remove oil stains and impurities on the surface of the tinplate, and drying the tinplate by using hot air at 70-100 ℃ after soaking;
(2) coating: coating the coating on the surface of the tinplate, and forming a layer of film on the surface of the tinplate after air blast drying;
(3) coating treatment: washing the surface of the film with ultrapure water for 10-15min, drying at normal temperature, and rolling;
the coating comprises the following components in parts by weight:
bisphenol a epoxy resin: 200-300 parts;
epoxy chloropropane: 150-250 parts;
ethylene diamine: 1-6 parts;
methyl etherified melamine resin: 200 portions and 250 portions;
ethylene glycol butyl ether: 300-400 parts;
carrier-nano silver: 0.5-2 parts.
By adopting the technical scheme, oil stains and impurities on the surface of the tinplate can be removed mildly by alcohol soaking in the pretreatment, so that the smoothness and the smoothness of the surface of the tinplate are improved, the coating of the coating is facilitated, and the adhesive force of the coating is improved. The coating provided by the invention is not directly added with a bisphenol A epoxy resin finished product, but is added with the raw materials of bisphenol A and epoxy chloropropane, the coating with proper polymerization degree and physical and chemical properties is obtained by controlling the adding amount of the raw materials and the catalyst ethylenediamine, and the coating formed after curing has better compactness and stronger corrosion resistance. The nano silver is a broad-spectrum bactericide, and is combined with a carrier material into a composite antibacterial agent in a coordination mode and other modes, so that a large amount of silver ions can be released, the metabolic activities of microorganisms such as bacteria and the like can be destroyed, the sterilization and antibacterial effects are achieved, and the food fresh-keeping capacity of the tinplate packaging material can be greatly improved.
More preferably, carboxymethyl chitosan is adopted as the carrier in the carrier-nano silver.
By adopting the technical scheme, the carboxymethyl chitosan is as nontoxic as chitosan, has good basic performances such as film forming property, degradability and biocompatibility, has amino groups in the chitosan, has good adsorption capacity on metal ion silver, and can be used as a protective agent to modify the size and the shape of nano silver by using the carboxymethyl chitosan as a carrier, so that the carboxymethyl chitosan-nano silver with good antibacterial effect is obtained.
More preferably, the preparation method of the carrier-nano silver comprises the following steps:
adding 1g of carboxymethyl chitosan into 250mL of deionized water, uniformly stirring, adding 250mL of silver nitrate solution with the concentration of 2mmol/L, stirring and heating to 50-60 ℃, reacting for 1h, cooling to 20-25 ℃, dropwise adding sodium borohydride solution with the concentration of 1mmol/L, stirring and reacting for 0.5h to obtain the carboxymethyl chitosan-nano silver.
By adopting the technical scheme, when the carboxymethyl chitosan-nano silver is prepared, a great amount of-NH existing in the carboxymethyl chitosan is mainly utilized2With Ag+The coordination reaction occurs, the macromolecular chains of the carboxymethyl chitosan are stretched to form a porous cavity matrix material, and simultaneously, under the action of heating and stirring, silver ions can enter the internal structure of the carboxymethyl chitosan macromolecules and react with-NH on the molecular chains2Performing coordination reaction, adding sodium borohydride solution, contacting with silver ion, performing reduction reaction, and adding Ag+Reducing the Ag into Ag.
More preferably, the step (2) is specifically configured as follows: coating the coating on the surface of the tinplate, and carrying out air drying at 200-300 ℃ for 60-120s to form a layer of film on the surface of the tinplate.
By adopting the technical scheme and the drying temperature and the drying time, the compact coating with high adhesive force can be obtained.
Further preferably, the coating has a coating thickness of at most 6.0g/m on the surface of the tinplate2。
More preferably, the coating has a coating thickness of at least 3.5g/m on the surface of the tinplate2。
By adopting the technical scheme, the thickness of the coating on the surface of the tinplate is controlled within the range, and the coating has certain porosity, so that liquid in the tinplate package can permeate into the surface of the tin coating through the pores, part of tin is slowly dissolved to form tin ions, and the effect of prolonging the quality guarantee period of the tinplate package is achieved.
Further preferably, the tinplate is subjected to sand blasting after pretreatment, fragments on the surface of the tinplate are blown off by a high-pressure air gun after the sand blasting is finished, then the tinplate is subjected to phosphating treatment, then is washed by water after the phosphating treatment, and is dried for 20min at the temperature of 110 ℃ and 130 ℃ after the washing by water.
Through adopting above-mentioned technical scheme, through adopting sand blasting, can increase the roughness on tin plate surface to the adhesive force of coating when increasing the later stage coating carries out bonderizing to the tin plate surface after the sandblast again, can compensate the impaired condition of surface tin coating that the sandblast caused, guarantees the corrosion-resistant and boiling resistance performance of tin plate.
More preferably, the blasting pressure is 0.16MPa and the number of shot meshes is 90 during the blasting treatment.
By adopting the technical scheme, the sand blasting pressure and the shot mesh number are adopted, so that the surface of the tinplate can be uniformly blasted, and the surface of the tinplate can form uniform roughness.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the coating provided by the invention is not directly added with a bisphenol A epoxy resin finished product, but is added with raw materials of bisphenol A and epoxy chloropropane, the coating with proper polymerization degree and physical and chemical properties is obtained by controlling the adding amount of the raw materials and a catalyst of ethylenediamine, and a coating formed after the coating is cured has good compactness and strong corrosion resistance;
(2) the nano silver is a broad-spectrum bactericide, and is combined with a carrier material into a composite antibacterial agent in a coordination mode and other modes, so that a large amount of silver ions can be released, the metabolic activities of microorganisms such as bacteria and the like can be destroyed, the sterilization and antibacterial effects are achieved, and the food fresh-keeping capacity of the tinplate packaging material can be greatly improved;
(3) the carrier adopts carboxymethyl chitosan which has the same non-toxicity as chitosan and has the basic performances of good film forming property, degradability, biocompatibility and the like, the chitosan has amino groups so that the chitosan has better adsorption capacity on metal ion silver, and the carboxymethyl chitosan is adopted as the carrier and can be used as a protective agent to modify the size and the shape of nano silver, so that the carboxymethyl chitosan-nano silver with good antibacterial effect is obtained.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples. It is to be noted that those not indicated for specific conditions, carried out under the conventional conditions or conditions recommended by the manufacturer, and those not indicated for the reagents or equipment, are conventional products which can be obtained by commercially purchasing them.
Example 1: the preparation method of the carboxymethyl chitosan-nano silver comprises the following steps: adding 1g of carboxymethyl chitosan into 250mL of deionized water, uniformly stirring, adding 250mL of silver nitrate solution with the concentration of 2mmol/L, stirring and heating to 50 ℃, reacting for 1h, cooling to 20 ℃, dropwise adding sodium borohydride solution with the concentration of 1mmol/L, and stirring and reacting for 0.5h to obtain the carboxymethyl chitosan-nano silver.
Example 2: a coating process of tinplate comprises the following steps:
(1) pretreatment: firstly, soaking tinplate in 75% alcohol solution for 5min to remove oil stains and impurities on the surface of the tinplate, and drying the tinplate by adopting hot air at 70 ℃ after soaking;
(2) coating: coating the coating on the surface of the tinplate through a rubber roller and an iron roller, wherein the coating thickness is 4g/m2Blowing and drying at 200 ℃ for 120s to form a layer of film on the surface of the tinplate;
(3) coating treatment: and (3) washing the surface of the film for 10min by using ultrapure water, drying at normal temperature, and rolling.
The coating in the step (2) consists of the following components in parts by weight:
bisphenol a epoxy resin: 200 parts of (A);
epoxy chloropropane: 150 parts;
ethylene diamine: 1 part;
methyl etherified melamine resin: 200 parts of (A);
ethylene glycol butyl ether: 300 parts of (A);
carboxymethyl chitosan-nano silver: 0.5 part; the carboxymethyl-nanosilver in this example was obtained using the preparation procedure in example 1.
Example 3: the coating process of the tinplate is different from that of the example 2 in that the coating in the step (2) consists of the following components in parts by weight:
bisphenol a epoxy resin: 250 parts of (A);
epoxy chloropropane: 200 parts of (A);
ethylene diamine: 3.5 parts;
methyl etherified melamine resin: 225 parts of (1);
ethylene glycol butyl ether: 350 parts of (a);
carboxymethyl chitosan-nano silver: 1.25 parts.
Example 4: the coating process of the tinplate is different from that of the example 2 in that the coating in the step (2) consists of the following components in parts by weight:
bisphenol a epoxy resin: 300 parts of (A);
epoxy chloropropane: 250 parts of (A);
ethylene diamine: 6 parts of (1);
methyl etherified melamine resin: 250 parts of (A);
ethylene glycol butyl ether: 400 parts of (1);
carboxymethyl chitosan-nano silver: and 2 parts.
Example 5: a process for coating tinplate, which is different from that in example 2 in that the step (1) is set as follows: firstly, soaking tinplate in 75% alcohol solution for 5min to remove oil stains and impurities on the surface of the tinplate, and drying the tinplate by adopting hot air at 70 ℃ after soaking; carrying out sand blasting treatment on the surface of the tinplate by adopting 90-mesh pills under the pressure of 0.16MPa, blowing off scraps on the surface of the tinplate by using a high-pressure air gun, carrying out phosphating treatment on the tinplate, then washing with water, and drying for 20min at the temperature of 110 ℃ after washing with water.
Comparative example 1: the difference between the coating process of tinplate and the example 2 is that carboxymethyl chitosan-nano silver is not added in the coating.
Comparative example 1: the difference between the process for coating tinplate and the process in example 2 is that epichlorohydrin and ethylenediamine are not added into the coating.
Performance testing
The tinplate obtained in each of examples 2 to 5 and comparative examples 1 to 2 was used as a test object, and the adhesion, corrosion resistance, retort resistance, Methyl Ethyl Ketone (MEK) rub resistance, and antibacterial property of the tinplate obtained by each coating process were respectively tested, and the test results are shown in table 1.
The test method comprises the following steps:
adhesion force: GB/T9286, cross-hatch method;
corrosion resistance: soaking in 2% lactic acid water solution at 120 deg.C for 90min, without bubble, whitening, water spot, discoloration, fading, and cooking displacement, and determining to be qualified;
boiling resistance: heating at 125 deg.C for 90min, without bubble, whitening, water spot, discoloration, fading, and cooking displacement, and determining to be qualified;
methyl Ethyl Ketone (MEK) rub resistance: GB/T17748.
According to the test results, compared with the method of directly adding the bisphenol A epoxy resin in the comparative example 2, the coating disclosed by the invention is qualified in adhesive force, corrosion resistance and the like after being coated, and excellent in performance, and the tinplate coated by the coating process and the coating formula disclosed by the invention has good processing resistance in practical application, and can be formed by one-step stamping. In addition, due to the addition of carboxymethyl chitosan-nano silver, the coated tinplate packaging material has good sterilization and antibacterial properties, the antibacterial rate reaches more than 98%, and the fresh-keeping capacity of the tinplate packaging material is greatly improved.
Table 1 results of performance testing
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A coating process of tinplate is characterized by comprising the following steps:
(1) pretreatment: firstly, soaking tinplate in 75% alcohol solution for 5-10min to remove oil stains and impurities on the surface of the tinplate, and drying the tinplate by using hot air at 70-100 ℃ after soaking;
(2) coating: coating the coating on the surface of the tinplate, and forming a layer of film on the surface of the tinplate after air blast drying;
(3) coating treatment: washing the surface of the film with ultrapure water for 10-15min, drying at normal temperature, and rolling;
the coating comprises the following components in parts by weight:
bisphenol a epoxy resin: 200-300 parts;
epoxy chloropropane: 150-250 parts;
ethylene diamine: 1-6 parts;
methyl etherified melamine resin: 200 portions and 250 portions;
ethylene glycol butyl ether: 300-400 parts;
carrier-nano silver: 0.5-2 parts.
2. The process for coating tinplate as claimed in claim 1, wherein carboxymethyl chitosan is used as the carrier in the carrier-nano silver.
3. The process for coating tinplate according to claim 2, wherein the carrier-nano silver is prepared by the following steps:
adding 1g of carboxymethyl chitosan into 250mL of deionized water, uniformly stirring, adding 250mL of silver nitrate solution with the concentration of 2mmol/L, stirring and heating to 50-60 ℃, reacting for 1h, cooling to 20-25 ℃, dropwise adding sodium borohydride solution with the concentration of 1mmol/L, stirring and reacting for 0.5h to obtain the carboxymethyl chitosan-nano silver.
4. The tinplate coating process of claim 1, wherein the step (2) is specifically configured as follows: coating the coating on the surface of the tinplate, and carrying out air drying at 200-300 ℃ for 60-120s to form a layer of film on the surface of the tinplate.
5. The process for coating tinplate according to claim 1, wherein the coating has a coating thickness of at most 6.0g/m on the tinplate surface2。
6. The process for coating tinplate as claimed in claim 1, wherein the coating has a thickness of at least 3.5g/m2。
7. The tinplate coating process as claimed in claim 1, wherein the tinplate is subjected to sand blasting after pretreatment, debris on the surface of the tinplate is blown off by a high pressure air gun after the sand blasting is completed, then the tinplate is subjected to phosphating treatment, then water washing is performed after the phosphating treatment, and the tinplate is dried at the temperature of 110-130 ℃ for 20min after the water washing.
8. The process for coating tinplate as claimed in claim 7, wherein the pressure of blasting is 0.16MPa and the mesh number of the pellets is 90 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911201204.0A CN110882880A (en) | 2019-11-29 | 2019-11-29 | Coating process of tinplate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911201204.0A CN110882880A (en) | 2019-11-29 | 2019-11-29 | Coating process of tinplate |
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| CN110882880A true CN110882880A (en) | 2020-03-17 |
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| CN201911201204.0A Pending CN110882880A (en) | 2019-11-29 | 2019-11-29 | Coating process of tinplate |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122203A (en) * | 2012-12-12 | 2013-05-29 | 孙才清 | Inner layer metal decorating paint and metal decorating method |
| CN110437544A (en) * | 2019-07-25 | 2019-11-12 | 台州市鸿运胶管有限公司 | A kind of intermingling material for automobile interiors and preparation method thereof |
-
2019
- 2019-11-29 CN CN201911201204.0A patent/CN110882880A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122203A (en) * | 2012-12-12 | 2013-05-29 | 孙才清 | Inner layer metal decorating paint and metal decorating method |
| CN110437544A (en) * | 2019-07-25 | 2019-11-12 | 台州市鸿运胶管有限公司 | A kind of intermingling material for automobile interiors and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 金银河: "《包装印刷技术》", 31 December 2005, 中国纺织出版社 * |
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