CN110183930B - Gloss oil and composite coating for laser coding - Google Patents

Gloss oil and composite coating for laser coding Download PDF

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Publication number
CN110183930B
CN110183930B CN201910425464.XA CN201910425464A CN110183930B CN 110183930 B CN110183930 B CN 110183930B CN 201910425464 A CN201910425464 A CN 201910425464A CN 110183930 B CN110183930 B CN 110183930B
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mass
parts
coating
gloss oil
resin
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CN110183930A (en
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翁师德
赖少波
曾成财
王马火
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Fujian Herun Packaging Coatings Co ltd
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Fujian Herun Packaging Coatings Co ltd
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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
    • 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
    • C09D5/002—Priming paints
    • 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
    • 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
    • C09D7/20—Diluents or solvents
    • 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
    • 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
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • C09D7/65—Additives macromolecular
    • 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
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/18—Spheres

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
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Abstract

The invention relates to the field of metal printing coatings, in particular to gloss oil for laser coding and a composite coating, wherein the gloss oil comprises 75-85 parts by mass of main resin; 2-8 parts by mass of a crosslinking agent; 5-15 parts by mass of a solvent; 1-5 parts by mass of a wax additive; 0.05 to 0.50 parts by mass of a catalyst; 0.05-1 part by mass of a defoaming agent; wherein the main body resin is epoxy resin; according to the invention, the epoxy resin system coating is used as the gloss oil, so that the cooking performance and the wear resistance of the coating can be improved, the gloss oil for laser coding is obtained by chemical compounding of the main body resin, the cross-linking agent, the solvent, the wax assistant, the catalyst and the defoaming agent, so that the gloss oil coating has excellent machining performance during laser coding, the whole composite coating cannot be punctured, the base material of a packaging can is ensured not to be exposed, the base material of the packaging can is prevented from rusting after being steamed and sterilized or placed for a long time, the long-term clarity of the coding identification is ensured, the recognition rate is high, and the application of the two-dimensional code technology on the packaging can is greatly improved.

Description

Gloss oil and composite coating for laser coding
Technical Field
The invention relates to the technical field of metal printing coatings, in particular to gloss oil for laser coding and a composite coating.
Background
Laser coding and marking on packaging cans such as cans and beverage cans are conventional processes, and with the progress of internet technology, scanning of two-dimensional codes to identify information and identity of products is becoming more and more common, so that the two-dimensional codes are introduced to packaging cans of foods, beverages and other daily consumer goods.
At present, most of two-dimensional codes on a packaging can are manufactured in a laser coding mode, the packaging can is generally provided with at least one layer of transparent protective coating, and the coating is directly burnt through by laser to code the two-dimensional codes; the coating is transparent, contrast color difference is not obvious, and the coating is damaged due to breakdown, so that the substrate is rusted after being exposed for a long time, the two-dimensional code identification is not clear easily, and the identification rate is low. Therefore, manufacturers can print the ink layer on the packaging can firstly and then apply a transparent protective layer to print codes on the ink layer, thereby solving the problem of unobvious contrast color difference. However, when the food can is subjected to laser coding, the problem of ink layer breakdown due to the difference of laser power control is also caused, and particularly, after the food can is subjected to a sterilization process or is placed for a long time, the defects of substrate rusting, unclear two-dimensional code and the like are caused.
Therefore, the existing composite coating for laser coding needs to be improved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide the gloss oil for laser coding. The gloss oil has good cooking property, excellent wear resistance, excellent adhesive force and machining performance, and can be suitable for the external coating of a can cover with deep drawing resistance requirement.
A second object of the invention is to provide a composite coating.
In view of the above, in one aspect of the present invention, the present invention provides a gloss oil for laser coding, comprising: 75-85 parts by mass of a main resin; 2-8 parts by mass of a crosslinking agent; 5-15 parts by mass of a solvent; 1-5 parts by mass of a wax additive; 0.05 to 0.50 parts by mass of a catalyst; 0.05-1 part by mass of a defoaming agent; wherein the main body resin is epoxy resin.
Therefore, the gloss oil for laser coding is obtained by chemical compounding of the main body resin, the cross-linking agent, the solvent, the wax assistant, the catalyst and the defoaming agent, wherein the main body resin is a main film forming substance, the cross-linking agent is a secondary film forming substance, the main body resin and the cross-linking agent react to crosslink and solidify to form the coating, the catalyst improves the crosslinking and solidifying degree and increases the hardness and the boiling resistance of the coating, and the epoxy resin system coating is used as the gloss oil, so that the boiling resistance and the wear resistance of the coating can be improved, the gloss oil coating has excellent machining performance when the laser coding is performed, the whole composite coating cannot be punctured, the packaging can be ensured that the substrate is not exposed, the coating cannot rust after being steamed and sterilized or placed for a long time, the coding mark is ensured to be clear for a long time, the recognition rate is high, and the application of the two-dimensional code technology on the packaging can is greatly improved.
In addition, the gloss oil for laser coding proposed by the above embodiments of the present invention may also have the following additional technical features:
according to an embodiment of the invention, the host resin is a linear high molecular weight epoxy resin.
According to the embodiment of the invention, the epoxy equivalent of the epoxy resin is 1000-4000 g/eq, and the softening point of the epoxy resin is more than 100 ℃.
According to an embodiment of the present invention, the cross-linking agent is at least one selected from a group consisting of a phenylamine resin, a urea-formaldehyde amine resin, and a yellowing-resistant isocyanate.
According to an embodiment of the present invention, the solvent is selected from the group consisting of 100# solvent oil, 150# solvent oil, a mixture of dibasic acid esters, ethylene glycol monobutyl ether, n-butanol, isophorone, ethylene glycol monoethyl ether acetate.
According to an embodiment of the invention, the wax adjuvant is a spherical polytetrafluoroethylene-modified polyethylene wax.
According to an embodiment of the invention, the catalyst is selected from organotin catalysts or acid catalysts.
According to an embodiment of the invention, the defoamer is selected from one of acrylates or organosiloxanes.
In another aspect of the invention, the invention provides a composite coating for laser coding, which comprises a bottom coating suitable for roll coating on a substrate of a packaging can, an ink layer roll coated on the bottom coating and a gloss oil layer roll coated on the ink layer; the gloss oil layer adopts the gloss oil for laser coding.
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
In one aspect of the invention, a gloss oil for laser coding is provided. According to an embodiment of the invention, the base coat comprises: 75-85 parts by mass of a main resin; 2-8 parts by mass of a crosslinking agent; 5-15 parts by mass of a solvent; 1-5 parts by mass of a wax additive; 0.05 to 0.50 parts by mass of a catalyst; 0.05-1 part by mass of a defoaming agent; wherein the main body resin is epoxy resin. Therefore, the epoxy resin system coating is used as gloss oil, the cooking performance and the wear resistance of the coating can be improved, the gloss oil for laser coding is obtained by chemical compounding of the main body resin, the cross-linking agent, the solvent, the wax assistant, the catalyst and the defoaming agent, so that when the laser coding is carried out, the gloss oil coating has excellent machining performance, the whole composite coating cannot be punctured, the packaging can substrate is ensured not to be exposed, the rust cannot be generated after the packaging can is steamed and sterilized or placed for a long time, the coding mark is ensured to be clear for a long time, the recognition rate is high, and the application of the two-dimensional code technology on the packaging can is greatly improved.
According to the embodiment of the invention, in order to improve the flexibility of the gloss oil; the main resin is linear high molecular weight epoxy resin. Linear means that the molecular chain arrangement of the epoxy resin is unbranched. Specifically, the epoxy equivalent of the epoxy resin is 1000-4000 g/eq, and the softening point of the epoxy resin is more than 100 ℃. The linear high molecular weight epoxy resin is selected, the coating has excellent flexibility after multiple baking, the machining performance is good, the resin with high softening point is selected, the coating has high hardness and good wear resistance, and the curling and scratching of the cover making procedure can be reduced.
According to an embodiment of the present invention, the cross-linking agent is selected from at least one of a phenylamine resin, a urea-formaldehyde amine resin, and a yellowing-resistant isocyanate. The crosslinking agent uses the phenylamine resin, the coating has good flexibility and adhesive force, the problem of adhesive force reduction after the coating is baked for many times can be solved, the smoothness is high, the surface friction coefficient of the coating can be reduced, and scratches are reduced; the cross-linking agent adopts urea-formaldehyde amino resin, so that the coating has good adhesive force, high hardness and good cooking property, and can reduce the scratch resistance; the crosslinking agent uses yellowing-resistant isocyanate, and the coating has good surface gloss and good cooking property. Therefore, the proper cross-linking agent can be flexibly selected according to actual requirements, so that the performances such as adhesion of the gloss oil, cooking performance and the like can be improved.
According to the embodiment of the invention, in order to improve the smoothness of the gloss oil surface and improve the glossiness and viscosity stability; the solvent is selected from 100# solvent oil, 150# solvent oil, dibasic acid ester mixture, ethylene glycol monobutyl ether, n-butanol, isophorone, and ethylene glycol monoethyl ether acetate. Wherein, the high and low boiling point solvents can be matched and mixed according to the solvent volatilization gradient and by combining with the actual baking and curing process; therefore, the low-boiling-point solvent can quickly volatilize and dry the surface, the high-boiling-point solvent such as the dibasic acid ester mixture can improve the flow bottle of the coating in the baking process, ensure the smoothness of the surface of the coating and improve the glossiness, the ethylene glycol monobutyl ether can reduce the surface tension of the coating and improve the wettability of the coating, and the n-butyl alcohol can improve the viscosity stability of the coating.
According to the embodiment of the invention, the wax auxiliary agent adopts spherical polytetrafluoroethylene modified polyethylene wax with smooth degree and good wear resistance. The spherical wax is selected, so that the softening point is high, the deformation at high temperature is small, the smoothness is excellent, and the wear resistance of the coating can be obviously improved.
According to an embodiment of the invention, the catalyst is selected from organotin catalysts or acid catalysts. Specifically, the organic tin catalyst can be dibutyltin or stannous octoate and is used for catalyzing an isocyanate crosslinking agent, the crosslinking density of the coating can be improved, the cooking performance is improved, the glossiness of the coating is improved, the acid catalyst is a benzene sulfonic acid type or a naphthalene sulfonic acid type and is used for catalyzing amino resin crosslinking, the crosslinking density is improved, the wear resistance is improved, and scratches are reduced. Therefore, the proper catalyst can be flexibly selected according to actual requirements to improve the performances of the gloss oil such as wear resistance, cooking performance and the like.
According to an embodiment of the invention, the defoamer is selected from one of acrylates or organosiloxanes. Therefore, the defoaming effect is good through the defoaming agent of acrylate or organosiloxane, the surface abnormality of the coating is not caused, and the migration is avoided.
In another aspect of the invention, the invention provides a composite coating for laser coding, which comprises a bottom coating layer suitable for being coated on a substrate of a packaging can, an ink layer coated on the bottom coating layer and a gloss oil layer coated on the ink layer; the gloss oil layer adopts the gloss oil for laser coding.
Wherein, the ink layer can adopt the ink material well known in the field; the base coat can adopt the base coat with the following formula: 70-85 parts by mass of a main resin; 5-15 parts by mass of a cross-linking agent and 5-15 parts by mass of a solvent; 1-5 parts by mass of an adhesion promoter; 0.05-0.50 parts of catalyst; 0.05-1 part by mass of a defoaming agent; 1-10 parts by mass of silica; the sum of the mass parts of the raw material components is 100 parts. The anti-scratch and high temperature resistance of the base coat are good, the base coat is suitable for laser coding, the laser coding cannot puncture the whole composite coating, the packaging can substrate is not exposed, the base coat is not rusted after being steamed and sterilized or placed for a long time, the coding mark is clear for a long time, the recognition rate is high, and the application of the two-dimensional code technology on the packaging can is greatly improved.
According to the embodiment of the invention, the base material of the packaging can be a can cover which can be made of ferrochrome, tinplate or aluminum; the base coat of the invention has good adhesion on the chromium iron plating, the tinplate or the aluminum material, and the ink layer can be well printed on the base coat in an adhesion way.
According to the embodiment of the invention, the main resin in the base coat can be linear high molecular weight epoxy resin, the epoxy equivalent of the epoxy resin is 1000-4000 g/eq, and the softening point is more than 100 ℃. The inner coating and the outer coating of the can cover need to be baked for many times, and the problem that paint is removed in the process of seaming and sterilization due to the fact that the flexibility of the coating is reduced and the adhesion is poor after the coating is baked for many times can be solved by using the linear high-molecular-weight epoxy resin.
According to the embodiment of the invention, the cross-linking agent in the base coat can be selected from at least one of phenylamine resin, urea-formaldehyde amine resin and yellowing-resistant isocyanate. The crosslinking agent uses the phenylamine resin, the coating has good flexibility and adhesive force, the problem of adhesive force reduction after the coating is baked for many times can be solved, the smoothness is high, the surface friction coefficient of the coating can be reduced, and scratches are reduced; the cross-linking agent adopts urea-formaldehyde amino resin, so that the coating has good adhesive force, high hardness and good cooking property, and can reduce the scratch resistance; the crosslinking agent uses yellowing-resistant isocyanate, and the coating has good surface gloss and good cooking property. Therefore, the proper cross-linking agent can be flexibly selected according to actual requirements, so that the performances of adhesion, cooking property and the like of the base coat can be improved. The solvent in the base coat can be selected from 100# solvent oil, 150# solvent oil, dibasic acid ester mixture, ethylene glycol monobutyl ether, n-butyl alcohol, isophorone and ethylene glycol monoethyl ether acetate. Wherein, the high and low boiling point solvents can be matched and mixed according to the solvent volatilization gradient and by combining with the actual baking and curing process; therefore, the low-boiling-point solvent can quickly volatilize and dry the surface, the high-boiling-point solvent such as the dibasic acid ester mixture can improve the flow bottle of the coating in the baking process, the smoothness of the surface of the coating is ensured, the glossiness is improved, the ethylene glycol monobutyl ether can reduce the surface tension of the gloss oil layer, the wettability of the coating is improved, and the n-butyl alcohol can improve the viscosity stability of the coating. The catalyst in the base coat is selected from an organotin catalyst or an acid catalyst. Specifically, the organic tin catalyst can be dibutyltin or stannous octoate and is used for catalyzing an isocyanate crosslinking agent, the crosslinking density of the coating can be improved, the cooking performance is improved, the glossiness of the coating is improved, the acid catalyst is a benzene sulfonic acid type or a naphthalene sulfonic acid type and is used for catalyzing amino resin crosslinking, the crosslinking density is improved, the wear resistance is improved, and scratches are reduced. Therefore, the proper catalyst can be flexibly selected according to actual requirements to improve the performances of the bottom coating such as wear resistance, cooking performance and the like. The defoaming agent in the base coat can be selected from one of acrylate or organic siloxane. Therefore, the defoaming effect is good through the defoaming agent of acrylate or organosiloxane, the surface abnormality of the coating is not caused, and the migration is avoided. The adhesion promoter in the base coat is selected from one of epoxy phosphate or low molecular weight epoxy resin. Therefore, the adhesion of the epoxy resin system primer to the substrate and the printing ink can be improved through the epoxy phosphate, and the flexibility of the coating can be improved through the low-molecular-weight epoxy resin. In order to improve the scratch resistance, the high temperature resistance and the machining performance of the base coat; the silica in the base coat is potassium aluminum silicate powder. Specifically, the silica is flaky aluminum potassium silicate and white powder with the fineness of less than 10 microns; therefore, the anti-scratch performance and the machining performance of the coating can be improved by adding the silica into the base coat, and the high-temperature resistance of the coating can also be improved.
Therefore, when the laser coding is performed, the base coat is firstly arranged on the tank cover, the ink layer is printed on the base coat after drying, and the oil layer is polished after drying, so that the base coat at the bottom layer cannot be punctured under the laser coding controllable power, the food tank is prevented from rusting after being steamed and sterilized or placed for a long time, the coding mark is clear, and the recognition rate is high.
The invention is further illustrated by the following examples:
example 1
The base material of the packaging can of the embodiment is a three-piece can cover which is made of chromium-plated iron sheets.
(1) Preparation of a base coating raw material: 81 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 2000; 5 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 8 parts of dibasic acid ester mixture; 2 parts by mass of epoxy phosphate; 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an acrylate defoaming agent. Firstly, mixing epoxy resin, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding epoxy phosphate, dodecylbenzene sulfonic acid and an acrylate defoaming agent, and continuously stirring and dispersing for 15-30 min to prepare a base coat raw material for later use.
(2) Preparing a gloss oil raw material: 78 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 1700; 5 parts of phenylamine resin and 3 parts of urea-formaldehyde amino; 3.5 parts of No. 150 solvent oil and 8 parts of dibasic acid ester mixture; 2 parts by mass of spherical polytetrafluoroethylene modified polyethylene wax (18% of solid content); 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an organic silicon defoaming agent. Firstly, mixing epoxy resin, phenylamine resin, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding spherical polytetrafluoroethylene modified polyethylene wax (the polytetrafluoroethylene modified polyethylene wax needs to be ground in advance), dodecylbenzene sulfonic acid and the organic silicon defoamer, and continuously stirring and dispersing for 15-30 min to prepare a gloss oil raw material for later use.
(3) Preparing a composite coating for laser coding:
firstly, after the primary coating raw material obtained in the step (1) is roll-coated on a chromium-plated iron sheet, baking the chromium-plated iron sheet at 180-200 ℃ for 1-15 minutes to enable the thickness of a dry film of the primary coating to be 4-7 g/m2 so as to form a primary coating.
Secondly, after printing a pattern on the bottom coating layer by using an ink roller, baking the bottom coating layer for 10 to 15 minutes at the temperature of 140 to 160 ℃ to form an ink layer on the bottom coating layer.
Thirdly, after the gloss oil raw material obtained in the step (2) is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 4-7 g/m2, so that a gloss oil layer is formed on the ink layer, and therefore a composite coating with a base coating layer, the ink layer and the gloss oil layer is formed on the three-piece can cover.
Example 2
The base material of the packaging can of the embodiment is a three-piece can cover which is made of chromium-plated iron sheets.
(1) Preparation of a base coating raw material: 73 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 2000; 5 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 5 parts of dibasic acid ester mixture; 7 parts by mass of low-molecular-weight epoxy resin with an epoxy equivalent of 300-600 and 6 parts by mass of potassium aluminum silicate powder; 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an acrylate defoaming agent. Firstly, mixing epoxy resin, urea-formaldehyde amino resin, No. 150 solvent oil, dibasic acid ester mixture, low molecular weight epoxy resin and potassium aluminum silicate powder, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding the dodecylbenzene sulfonic acid and the acrylate defoaming agent, and continuously stirring and dispersing for 15-30 min to prepare a base coat raw material for later use.
(2) Preparing a gloss oil raw material: 78 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 1700; 5 parts of phenylamine resin and 3 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 8 parts of dibasic acid ester mixture; 2 parts by mass of spherical polytetrafluoroethylene modified polyethylene wax (18% of solid content); 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an organic silicon defoaming agent. Firstly, mixing epoxy resin, phenylamine resin, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding spherical polytetrafluoroethylene modified polyethylene wax (the polytetrafluoroethylene modified polyethylene wax needs to be ground in advance), dodecylbenzene sulfonic acid and the organic silicon defoamer, and continuously stirring and dispersing for 15-30 min to prepare a gloss oil raw material for later use.
(3) Preparing a composite coating for laser coding:
firstly, after the primary coating raw material obtained in the step (1) is roll-coated on a chromium-plated iron sheet, baking the chromium-plated iron sheet at 180-200 ℃ for 1-15 minutes to enable the thickness of a dry film of the primary coating to be 4-7 g/m2 so as to form a primary coating.
Secondly, after printing a pattern on the bottom coating layer by using an ink roller, baking the bottom coating layer for 10 to 15 minutes at the temperature of 140 to 160 ℃ to form an ink layer on the bottom coating layer.
Thirdly, after the gloss oil raw material obtained in the step (2) is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 4-7 g/m2, so that a gloss oil layer is formed on the ink layer, and therefore a composite coating with a base coating layer, the ink layer and the gloss oil layer is formed on the three-piece can cover.
Example 3
The base material of the packaging can of the embodiment is a three-piece can cover which is made of chromium-plated iron sheets.
(1) Preparation of a base coating raw material: 73 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 2000; 5 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 5 parts of dibasic acid ester mixture; 7 parts by mass of low-molecular-weight epoxy resin with an epoxy equivalent of 300-600 and 6 parts by mass of potassium aluminum silicate powder; 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an acrylate defoaming agent. Firstly, mixing epoxy resin, urea-formaldehyde amino resin, No. 150 solvent oil, dibasic acid ester mixture, low molecular weight epoxy resin and potassium aluminum silicate powder, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding the dodecylbenzene sulfonic acid and the acrylate defoaming agent, and continuously stirring and dispersing for 15-30 min to prepare a base coat raw material for later use.
(2) Preparing a gloss oil raw material: 78 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 1700; 3 parts of yellowing-resistant isocyanate and 6 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 8 parts of dibasic acid ester mixture; 2 parts by mass of spherical polytetrafluoroethylene modified polyethylene wax (18% of solid content); 0.1 part by mass of decadiphenylsulfonic acid, and 0.1 part by mass of dibutyltin dilaurate; 0.2 part by mass of an organic silicon defoaming agent. Firstly, mixing epoxy resin, yellowing-resistant isocyanate, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding spherical polytetrafluoroethylene modified polyethylene wax (the polytetrafluoroethylene modified polyethylene wax needs to be ground in advance), dibutyl tin dilaurate, dodecylbenzene sulfonic acid and an organic silicon defoaming agent, and continuously stirring and dispersing for 15-30 min to prepare a gloss oil raw material for later use.
(3) Preparing a composite coating for laser coding:
firstly, after the primary coating raw material obtained in the step (1) is roll-coated on a chromium-plated iron sheet, baking the chromium-plated iron sheet at 180-200 ℃ for 1-15 minutes to enable the thickness of a dry film of the primary coating to be 4-7 g/m2 so as to form a primary coating.
Secondly, after printing a pattern on the bottom coating layer by using an ink roller, baking the bottom coating layer for 10 to 15 minutes at the temperature of 140 to 160 ℃ to form an ink layer on the bottom coating layer.
Thirdly, after the gloss oil raw material obtained in the step (2) is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 4-7 g/m2, so that a gloss oil layer is formed on the ink layer, and therefore a composite coating with a base coating layer, the ink layer and the gloss oil layer is formed on the three-piece can cover.
Example 4
The base material of the packaging can of the embodiment is a three-piece can cover which is made of chromium-plated iron sheets.
(1) Preparation of a base coating raw material: 73 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 2000; 5 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 5 parts of dibasic acid ester mixture; 7 parts by mass of low-molecular-weight epoxy resin with an epoxy equivalent of 300-600 and 6 parts by mass of potassium aluminum silicate powder; 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an acrylate defoaming agent. Firstly, mixing epoxy resin, urea-formaldehyde amino resin, No. 150 solvent oil, dibasic acid ester mixture, low molecular weight epoxy resin and potassium aluminum silicate powder, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding the dodecylbenzene sulfonic acid and the acrylate defoaming agent, and continuously stirring and dispersing for 15-30 min to prepare a base coat raw material for later use.
(2) Preparing a gloss oil raw material: 81 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 1700; 3 parts of phenylamine resin and 3 parts of urea-formaldehyde amino; 3.5 parts of No. 150 solvent oil, 2 parts of dibasic acid ester mixture and 2 parts of ethylene glycol monobutyl ether; 5 parts by mass of spherical polytetrafluoroethylene modified polyethylene wax (18% of solid content); 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an organic silicon defoaming agent. Firstly, mixing epoxy resin, phenylamine resin, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding spherical polytetrafluoroethylene modified polyethylene wax (the polytetrafluoroethylene modified polyethylene wax needs to be ground in advance), dodecylbenzene sulfonic acid and the organic silicon defoamer, and continuously stirring and dispersing for 15-30 min to prepare a gloss oil raw material for later use.
(3) Preparing a composite coating for laser coding:
firstly, after the primary coating raw material obtained in the step (1) is roll-coated on a chromium-plated iron sheet, baking the chromium-plated iron sheet at 180-200 ℃ for 1-15 minutes to enable the thickness of a dry film of the primary coating to be 4-7 g/m2 so as to form a primary coating.
Secondly, after printing a pattern on the bottom coating layer by using an ink roller, baking the bottom coating layer for 10 to 15 minutes at the temperature of 140 to 160 ℃ to form an ink layer on the bottom coating layer.
Thirdly, after the gloss oil raw material obtained in the step (2) is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 4-7 g/m2, so that a gloss oil layer is formed on the ink layer, and therefore a composite coating with a base coating layer, the ink layer and the gloss oil layer is formed on the three-piece can cover.
Example 5
The base material of the packaging can of the embodiment is a three-piece can cover which is made of chromium-plated iron sheets.
(1) Preparation of a base coating raw material: 73 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 2000; 5 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 5 parts of dibasic acid ester mixture; 7 parts by mass of low-molecular-weight epoxy resin with an epoxy equivalent of 300-600 and 6 parts by mass of potassium aluminum silicate powder; 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an acrylate defoaming agent. Firstly, mixing epoxy resin, urea-formaldehyde amino resin, No. 150 solvent oil, dibasic acid ester mixture, low molecular weight epoxy resin and potassium aluminum silicate powder, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding the dodecylbenzene sulfonic acid and the acrylate defoaming agent, and continuously stirring and dispersing for 15-30 min to prepare a base coat raw material for later use.
(2) Preparing a gloss oil raw material: 73 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 1700; 7 parts of phenylated amino resin, 3 parts of yellowing-resistant isocyanate and 5 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 5 parts of dibasic acid ester mixture; 3 parts by mass of spherical polytetrafluoroethylene-modified polyethylene wax (18% of solid content); 0.2 part by mass of decadiphenylsulfonic acid; 0.3 part by mass of an organic silicon defoaming agent. Firstly, mixing epoxy resin, phenylated amino resin, yellowing-resistant isocyanate, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; and after stirring and dispersing, continuously adding spherical polytetrafluoroethylene modified polyethylene wax (the polytetrafluoroethylene modified polyethylene wax needs to be ground in advance), dodecylbenzene sulfonic acid and the organic silicon defoamer, and continuously stirring and dispersing for 15-30 min to prepare a gloss oil raw material for later use.
(3) Preparing a composite coating for laser coding:
firstly, after the primary coating raw material obtained in the step (1) is roll-coated on a chromium-plated iron sheet, baking the chromium-plated iron sheet at 180-200 ℃ for 1-15 minutes to enable the thickness of a dry film of the primary coating to be 4-7 g/m2 so as to form a primary coating.
Secondly, after printing a pattern on the bottom coating layer by using an ink roller, baking the bottom coating layer for 10 to 15 minutes at the temperature of 140 to 160 ℃ to form an ink layer on the bottom coating layer.
Thirdly, after the gloss oil raw material obtained in the step (2) is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 4-7 g/m2, so that a gloss oil layer is formed on the ink layer, and therefore a composite coating with a base coating layer, the ink layer and the gloss oil layer is formed on the three-piece can cover.
Comparative example 1
The packaging can base material of the comparative example is a three-piece can cover made of chromium-plated iron sheets.
Firstly, printing a pattern on a ferrochrome-plated sheet by using an ink roller, and then baking the sheet at 140-160 ℃ for 10-15 minutes to form an ink layer on the sheet.
Secondly, after a commercially available transparent oil raw material is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 6-10 g/m2, so that a transparent oil layer is formed on the ink layer, and a composite coating with the ink layer and the transparent oil layer is formed on the three-piece can cover.
Comparative example 2
The packaging can base material of the comparative example is a three-piece can cover made of chromium-plated iron sheets.
(1) Preparing a gloss oil raw material: 78 parts by mass of an epoxy resin (40% solid content) having an epoxy equivalent of 1700; 3 parts of yellowing-resistant isocyanate and 3 parts of urea-formaldehyde amino resin; 3.5 parts of No. 150 solvent oil and 8 parts of dibasic acid ester mixture; 4 parts by mass of spherical polytetrafluoroethylene-modified polyethylene wax (18% of solid content); 0.1 part by mass of decadiphenylsulfonic acid, and 0.1 part by mass of dibutyltin dilaurate; 0.3 part by mass of an organic silicon defoaming agent. Firstly, mixing epoxy resin, yellowing-resistant isocyanate, urea-formaldehyde amino resin, No. 150 solvent oil and dibasic acid ester mixture, and stirring and dispersing for 15 min; after stirring and dispersing, continuously adding spherical polytetrafluoroethylene modified polyethylene wax (the polytetrafluoroethylene modified polyethylene wax is ground in advance), dibutyl tin dilaurate, dodecylbenzene sulfonic acid and organic silicon defoamer, and continuously stirring and dispersing for 15-30 min to prepare gloss oil raw material for later use
Firstly, printing a pattern on a ferrochrome-plated sheet by using an ink roller, and then baking the sheet at 140-160 ℃ for 10-15 minutes to form an ink layer on the sheet.
Secondly, after the gloss oil raw material prepared in the step (1) is coated on the ink layer in a rolling mode, baking is carried out for 10-15 minutes at 190-210 ℃ to enable the thickness of a coating dry film to be 6-10 g/m2, so that a transparent oil layer is formed on the ink layer, and a composite coating with the ink layer and the gloss oil layer is formed on the three-piece can cover.
The results of testing the coatings prepared in each example and comparative example are shown in table 1 below.
TABLE 1
Figure BDA0002067349810000091
Figure BDA0002067349810000101
In conclusion, the gloss oil for laser coding and the composite coating thereof are used for laser coding, the two-dimensional code is free of any rust after being sterilized and soaked in a copper sulfate solution, the two-dimensional code is clear and recognizable, and the problem that the two-dimensional code is not clear due to rust in the prior art is solved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (5)

1. The composite coating for laser coding is characterized by comprising a base coating suitable for being coated on a substrate of a packaging can, an ink layer coated on the base coating and a gloss oil layer coated on the ink layer; the gloss oil layer includes:
75-85 parts by mass of a main resin;
5-15 parts by mass of a crosslinking agent;
5-15 parts by mass of a solvent;
1-5 parts by mass of a wax additive;
0.05 to 0.50 parts by mass of a catalyst;
0.05-1 part by mass of a defoaming agent;
the main resin is linear high-molecular-weight epoxy resin, the epoxy equivalent of the epoxy resin is 1000-4000 g/eq, and the softening point of the epoxy resin is more than 100 ℃;
the cross-linking agent is selected from at least one of phenylamine resin, urea-formaldehyde amine resin and yellowing-resistant isocyanate.
2. The composite coating for laser coding as claimed in claim 1, wherein: the solvent is selected from 100# solvent oil, 150# solvent oil, dibasic acid ester mixture, ethylene glycol monobutyl ether, n-butanol, isophorone and ethylene glycol monoethyl ether acetate.
3. The composite coating for laser coding as claimed in claim 1, wherein: the wax additive is spherical polytetrafluoroethylene modified polyethylene wax.
4. The composite coating for laser coding as claimed in claim 1, wherein: the catalyst is selected from an organotin catalyst or an acid catalyst.
5. The composite coating for laser coding as claimed in claim 1, wherein: the defoaming agent is selected from one of acrylate or organic siloxane.
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Denomination of invention: A varnish and composite coating for laser coding

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