CN108745836A - A kind of fresh-keeping two-piece can tinplate and preparation method thereof - Google Patents

A kind of fresh-keeping two-piece can tinplate and preparation method thereof Download PDF

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Publication number
CN108745836A
CN108745836A CN201810394279.4A CN201810394279A CN108745836A CN 108745836 A CN108745836 A CN 108745836A CN 201810394279 A CN201810394279 A CN 201810394279A CN 108745836 A CN108745836 A CN 108745836A
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China
Prior art keywords
layer
fresh
keeping
tinplate
thickness
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CN201810394279.4A
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Chinese (zh)
Inventor
曾安扣
程建华
王德清
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Anhui Lida Tank Industry Co Ltd
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Anhui Lida Tank Industry Co Ltd
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Priority to CN201810394279.4A priority Critical patent/CN108745836A/en
Publication of CN108745836A publication Critical patent/CN108745836A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/66—Polyesters containing oxygen in the form of ether groups
    • C08G63/664—Polyesters containing oxygen in the form of ether groups derived from hydroxy carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • 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
    • 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
    • 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
    • B05D2503/00—Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2508/00—Polyesters

Abstract

The present invention discloses a kind of fresh-keeping two-piece can tinplate and preparation method thereof, which includes tinplate layer, antirust coat, the first waterproof layer, the second waterproof layer, fresh-keeping layer, antibiotic layer；It is provided with antirust coat on the outside of the tinplate layer, the first waterproof layer is provided on antirust coat；It is provided with the second waterproof layer on the inside of tinplate layer, fresh-keeping layer is provided on the second waterproof layer, antibiotic layer is provided in fresh-keeping layer；The thickness of the tinplate layer is 1-5mm；The thickness of the antirust coat is 0.1-0.3mm, and antirust coat is made of PET film；The thickness of first waterproof layer is 0.1-0.3mm；The thickness of second waterproof layer is 0.2-0.4mm；First waterproof layer, the second waterproof layer are made of polyurethane water-proof paint；The thickness of the fresh-keeping layer is 0.5-1mm, and fresh-keeping layer is made of copolymer heat pressure film；The thickness of the antibiotic layer is 0.2-0.3mm, and antibiotic layer is by SiO2- AgCl laminated films are made.The present invention has the characteristics that easy to process, anticorrosive, fresh-keeping.

Description

A kind of fresh-keeping two-piece can tinplate and preparation method thereof
Technical field
The present invention relates to a kind of fresh-keeping two-piece can tinplate and preparation method thereof, especially it is a kind of have it is easy to process, Anticorrosive, fresh-keeping fresh-keeping two-piece can tinplate and preparation method thereof.
Background technology
The pop can used currently on the market be typically all use aluminium alloy drawing and forming, or roll rivet welding with tinplate and At also having and begin to use making of pure aluminum pop can.And the ironing two-piece can occurred earliest is ironing two panels aluminium pot, Just there is ironing tin plate (tinplate) two-piece can later.
Tinplate inherently has good leakproofness, keeping quality, photophobism and robustness, is the gold that people are commonly used Belong to material and the common raw material of can.
Tinplate has good leakproofness, keeping quality, photophobism and robustness, very popular, extensive use In food packaging, pharmaceuticals packaging, commodity packaging, instrument and meter packaging, industrial products packaging etc., tinplate container is strong Degree height, good moldability and the good compatibility to product, have the good market demand, with perfect, the Ma Kou of technology at home Iron overlay film has also obtained more and more utilizations, and overlay film can solve the no performance of many tinplates.
Invention content
There is easy to process, anticorrosive, fresh-keeping fresh-keeping two-piece can tinplate the purpose of the present invention is to provide a kind of And preparation method thereof.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of fresh-keeping two-piece can tinplate, including it is tinplate layer, antirust coat, the first waterproof layer, the second waterproof layer, fresh-keeping Layer, antibiotic layer；
It is provided with antirust coat on the outside of the tinplate layer, the first waterproof layer is provided on antirust coat；It is set on the inside of tinplate layer It is equipped with the second waterproof layer, fresh-keeping layer is provided on the second waterproof layer, antibiotic layer is provided in fresh-keeping layer；
The thickness of the tinplate layer is 1-5mm；
The thickness of the antirust coat is 0.1-0.3mm；
The thickness of first waterproof layer is 0.1-0.3mm；The thickness of second waterproof layer is 0.2-0.4mm；
The thickness of the fresh-keeping layer is 0.5-1mm；
The thickness of the antibiotic layer is 0.2-0.3mm；
The antirust coat is made of PET film；First waterproof layer, second waterproof layer are applied by polyurethane water-proof Material is made；The fresh-keeping layer is made of copolymer heat pressure film；The antibiotic layer is by SiO2- AgCl laminated films are made；
The preparation of the polyurethane water-proof paint is prepared by the substance of following weight ratio：40-60wt% polyurethane adds Add agent, 20-30wt% polyester polyol, 20-30wt% isocyanates；The composition of the polyurethane additive is 30- 50wt% acrylonitritrile-styrene resins, 50-70wt% polyester polyol, 3-6wt% catalyst；The catalyst is Double dimethylaminoethyl ethers of 70wt% and 30wt% dipropylene glycol DPG mixtures；
A kind of preparation method of fresh-keeping two-piece can tinplate, includes the following steps：
Step 1: prepared by antirust coat：It goes PET nanometer powders after 250 DEG C -270 DEG C dissolve, is added drop-wise to tinplate layer one Side, and by the way that PET solution to be uniformly coated on through hot spin coater on tinplate layer, it is 0.1-0.3mm to make PET thickness, is completed anti- The preparation of rusty scale；
Step 2: prepared by the first waterproof layer：Measure the double dimethylaminoethyl ethers and mono- contracting dipropyls two of 30wt% of 70wt% Alcohol DPG is uniformly mixed and catalyst is made；Take the catalyst of 3-6wt% that 30-50wt% acrylonitritrile-styrene resins, 50- is added In 70wt% polyester polyol, polyurethane additive is made after stirring evenly；Take 40-60wt% polyurethane additives, and to poly- 20-30wt% polyester polyol, 20-30wt% isocyanates are added in urethane additive, after stirring evenly, are stored at room temperature 60- 80min obtains mixed solution A；
Mixed solution A is brushed in the antirust coat upper surface of tinplate layer by silk-screen printing, 10- is stood after printing 20min is subsequently placed into drying box and is tentatively toasted 15 minutes through 200 DEG C, using film thickness gauge, measures mixed solution A on antirust coat Thickness；Repeatedly printing, preliminary baking, until the thickness of mixed solution A is 0.1-0.3mm, then dry through 200 DEG C of 120-150min It is roasting, complete the preparation of the first waterproof layer；
Step 3: prepared by the second waterproof layer：Mixed solution A is coated on horse using silk-screen printing in the tinplate layer other side Mouthful iron layer other side, by repeatedly printing, tentatively toast after, the second waterproof layer that thickness is 0.2-0.4mm is made；
Step 4: the preparation of fresh-keeping layer：Dry lactide is weighed, is added in ethyl acetate solution, is configured to 1-2g/ Ml is collected and is crystallized on filter paper through heating for multiple times, filtering, recrystallization, and it is vacuum dried after, obtain white powder B；
10-15wt% initiator both-end hydroxyls PEG is added in three-necked flask, through 100 DEG C of oil bath, continuous vacuum drying 4-5h；0.2-0.3wt% octoate catalysts stannous, 80-90wt% white powder B is then added, after three-necked flask vacuumizes, fills Enter argon gas；120 DEG C are then raised temperature to, 24 hours are kept the temperature, through ring-opening reaction；After reaction, by centrifugation product, chlorine is added It is imitative, after being completely dissolved, absolute ethyl alcohol is added dropwise, generates white depositions, when white depositions are not further added by, filtration drying Afterwards, block copolymer white depositions C is obtained；
Block copolymer white depositions C is uniformly sprinkling upon the second waterproof layer upper surface, the uniform hot pressing of flat platen is used in combination, 200-220 DEG C of heating temperature, the capillary after the C dissolvings of block copolymer white depositions in the second waterproof layer and flat platen are existing As under effect, forming fresh-keeping layer；
Step 5: the preparation of antibiotic layer：
By AgNO3With N vinylamide polymer in molar ratio 1:N vinylamide polymer-second is added in 7-8 2-3h, subsequent AgNO are mixed in alcoholic solution and under condition of ice bath3It is 1 in molar ratio with HCl:1.5-2 being added in HCl； 12h is stirred under the conditions of being protected from light, obtains AgCl colloidal sols, then to the N- vinylamides in AgCl solution, adding 0.15wt% Type of Collective object-ethanol solution, stirring is for 24 hours；
It is 1-4 by volume again:1:1 ratio is by above-mentioned AgNO3Solution, above-mentioned HCl solution are added to SiO2In colloidal sol, It is spin-coated in fresh-keeping layer after mixing, after 200-220 DEG C of baking, obtains SiO2- AgCl films, thickness 0.2- 0.3mm；
The AgNO3With the AgNO of a concentration of 0.3-0.4mol/L3Solution；HCl is that the HCl of concentration 0.15-0.2mol/L is molten Liquid.
The present invention provides a kind of fresh-keeping two-piece can tinplates and preparation method thereof, have easy to process, anticorrosive, guarantor Fresh feature.
Description of the drawings
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is a kind of cross section structure schematic diagram of fresh-keeping two-piece can tinplate of the present invention.
Specific implementation mode
The purpose of the present invention can be achieved through the following technical solutions：
A kind of fresh-keeping two-piece can tinplate, referring to Fig. 1, including tinplate layer 1, antirust coat 2, the first waterproof layer 3, second Waterproof layer 4, fresh-keeping layer 5, antibiotic layer 6；
1 outside of the tinplate layer is provided with antirust coat 2, and the first waterproof layer 3 is provided on antirust coat 2；In tinplate layer 1 Side is provided with the second waterproof layer 4, and fresh-keeping layer 5 is provided on the second waterproof layer 4, antibiotic layer 6 is provided in fresh-keeping layer 5；
The thickness of the tinplate layer 1 is 1-5mm；
The thickness of the antirust coat 2 is 0.1-0.3mm, and antirust coat 2 is made of PET film；
The thickness of first waterproof layer 3 is 0.1-0.3mm；The thickness of second waterproof layer 4 is
0.2-0.4mm；First waterproof layer 3, the second waterproof layer 4 are made of polyurethane water-proof paint；
The thickness of the fresh-keeping layer 5 is 0.5-1mm, and fresh-keeping layer 5 is made of copolymer heat pressure film；
The thickness of the antibiotic layer 6 is 0.2-0.3mm, and antibiotic layer 6 is by SiO2- AgCl laminated films are made；
The preparation of the polyurethane water-proof paint is prepared by the substance of following weight ratio：40-60wt% polyurethane adds Add agent, 20-30wt% polyester polyol, 20-30wt% isocyanates；The composition of the polyurethane additive is 30- 50wt% acrylonitritrile-styrene resins, 50-70wt% polyester polyol, 3-6wt% catalyst；The catalyst is Double dimethylaminoethyl ethers of 70wt% and 30wt% dipropylene glycol DPG mixtures；
A kind of preparation method of fresh-keeping two-piece can tinplate, includes the following steps：
Step 1: prepared by antirust coat 2：It goes PET nanometer powders after 250 DEG C -270 DEG C dissolve, is added drop-wise to tinplate layer 1 one Side, and by the way that PET solution to be uniformly coated on through hot spin coater on tinplate layer 1, it is 0.1-0.3mm to make PET thickness, is completed anti- The preparation of rusty scale 2；
Step 2: prepared by the first waterproof layer 3：Measure the double dimethylaminoethyl ethers and mono- contracting dipropyls two of 30wt% of 70wt% Alcohol DPG is uniformly mixed and catalyst is made；Take the catalyst of 3-6wt% that 30-50wt% acrylonitritrile-styrene resins, 50- is added In 70wt% polyester polyol, polyurethane additive is made after stirring evenly；Take 40-60wt% polyurethane additives, and to poly- 20-30wt% polyester polyol, 20-30wt% isocyanates are added in urethane additive, after stirring evenly, are stored at room temperature 60- 80min obtains mixed solution A；
Mixed solution A is brushed in 2 upper surface of antirust coat of tinplate by silk-screen printing, 10- is stood after printing 20min is subsequently placed into drying box and is tentatively toasted 15 minutes through 200 DEG C, using film thickness gauge, measures mixed solution A on antirust coat 2 Thickness；Repeatedly printing, preliminary baking, until the thickness of mixed solution A is 0.1-0.3mm, then dry through 200 DEG C of 120-150min It is roasting, complete the preparation of the first waterproof layer 3；
Step 3: prepared by the second waterproof layer 4：Mixed solution A is coated on using silk-screen printing in 1 other side of tinplate layer 1 other side of tinplate layer, by repeatedly printing, tentatively toast after, be made thickness be 0.2-0.4mm the second waterproof layer 4；
Step 4: the preparation of fresh-keeping layer 5：Dry lactide is weighed, is added in ethyl acetate solution, is configured to 1-2g/ Ml is collected and is crystallized on filter paper through heating for multiple times, filtering, recrystallization, and it is vacuum dried after, obtain white powder B；
10-15wt% initiator both-end hydroxyls PEG is added in three-necked flask, through 100 DEG C of oil bath, continuous vacuum drying 4-5h；0.2-0.3wt% octoate catalysts stannous, 80-90wt% white powder B is then added, after three-necked flask vacuumizes, fills Enter argon gas；120 DEG C are then raised temperature to, 24 hours are kept the temperature, through ring-opening reaction；After reaction, by centrifugation product, chlorine is added It is imitative, after being completely dissolved, absolute ethyl alcohol is added dropwise, generates white depositions, when white depositions are not further added by, filtration drying Afterwards, block copolymer white depositions C is obtained；
Block copolymer white depositions C is uniformly sprinkling upon 4 upper surface of the second waterproof layer, flat platen uniform heat is used in combination Pressure, 200-220 DEG C of heating temperature, in the second waterproof layer 4 and the hair in flat platen after the C dissolvings of block copolymer white depositions Under thin phenomenon effect, fresh-keeping layer 5 is formed；
Step 5: the preparation of antibiotic layer 6：
By AgNO3With N vinylamide polymer in molar ratio 1:N vinylamide polymer-second is added in 7-8 2-3h, subsequent AgNO are mixed in alcoholic solution and under condition of ice bath3It is 1 in molar ratio with HCl:1.5-2 being added in HCl； 12h is stirred under the conditions of being protected from light, obtains AgCl colloidal sols, then to the N- vinylamides in AgCl solution, adding 0.15wt% Type of Collective object-ethanol solution, stirring is for 24 hours；
It is 1-4 by volume again:1:1 ratio is by above-mentioned AgNO3Solution, above-mentioned HCl solution are added to SiO2In colloidal sol, It is spin-coated on after mixing in fresh-keeping layer 5, after 200-220 DEG C of baking, obtains SiO2- AgCl films, thickness 0.2- 0.3mm；
The AgNO3With the AgNO of a concentration of 0.3-0.4mol/L3Solution；HCl is that the HCl of concentration 0.15-0.2mol/L is molten Liquid.
Beneficial effects of the present invention are：
Tinplate inherently has good leakproofness, keeping quality, photophobism and robustness, is the gold that people are commonly used Belong to material and the common raw material of can.The outside of tinplate layer 1 be provided with antirust coat 2 by PET nanometer powders through 250 DEG C- 270 DEG C dissolve and are coated on 1 outer surface of tinplate layer, and the thickness of antirust coat 2 is 0.1-0.3mm, and antirust coat 2 has to be drawn well Stretching property is processed in two-piece can in punching course, not easy to break；First waterproof layer 3, the second waterproof layer 4 have polyurethane water-proof painting Material is made, and the first waterproof layer 3, the second waterproof layer 4 are respectively 0.1-0.3mm, 0.2-0.4mm, the first waterproof layer 3, the second waterproof 4 tensile property of layer are high, are safe from harm, do not pollute the environment to human body, environmentally protective, can promote the anti-aging of tinplate overlay film Property, it can effectively avoid the erosion of rainwater；Fresh-keeping layer 5 is made of copolymer heat pressure film, and fresh-keeping layer 5 has good ductility； Fresh-keeping layer 5, which has, improves CO2、O2, vapor permeability and selective penetrated property；Under keeping-freshness storage environment, fresh-keeping layer 5 The rationality atmospheric condition in environment can be established and be maintained to permeability and selective penetrated property, reach the mesh for extending the food fresh keeping phase 's.
The present invention provides a kind of fresh-keeping two-piece can tinplates and preparation method thereof, have easy to process, anticorrosive, guarantor Fresh feature.
Above content is only to structure of the invention example and explanation, affiliated those skilled in the art couple Described specific embodiment does various modifications or additions or substitutes by a similar method, without departing from invention Structure or beyond the scope defined by this claim, is within the scope of protection of the invention.

Claims (5)

1. a kind of fresh-keeping two-piece can tinplate, including tinplate layer (1), antirust coat (2), the first waterproof layer (3), the second waterproof Layer (4), fresh-keeping layer (5), antibiotic layer (6), it is characterised in that；
It is provided with antirust coat (2) on the outside of the tinplate layer (1), the first waterproof layer (3) is provided on antirust coat (2)；Tinplate It is provided with the second waterproof layer (4) on the inside of layer (1), fresh-keeping layer (5) is provided on the second waterproof layer (4), fresh-keeping layer is provided on (5) Antibiotic layer (6)；
The thickness of the tinplate layer (1) is 1-5mm；
The thickness of the antirust coat (2) is 0.1-0.3mm；
The thickness of first waterproof layer (3) is 0.1-0.3mm；The thickness of second waterproof layer (4) is 0.2-0.4mm；
The thickness of the fresh-keeping layer (5) is 0.5-1mm；
The thickness of the antibiotic layer (6) is 0.2-0.3mm.
2. a kind of fresh-keeping two-piece can tinplate according to claim 1, which is characterized in that the antirust coat (2) is by PET Film is made；First waterproof layer (3), second waterproof layer (4) are made of polyurethane water-proof paint；The fresh-keeping layer (5) it is made of copolymer heat pressure film；The antibiotic layer (6) is by SiO2- AgCl laminated films are made.
3. a kind of fresh-keeping two-piece can tinplate according to claim 1, which is characterized in that the polyurethane water-proof paint Preparation be prepared by the substance of following weight ratio：40-60wt% polyurethane additives, 20-30wt% polyester polyol, 20-30wt% isocyanates；The composition of the polyurethane additive be 30-50wt% acrylonitritrile-styrene resins, 50-70wt% polyester polyol, 3-6wt% catalyst；The catalyst be 70wt% double dimethylaminoethyl ethers and 30wt% dipropylene glycol DPG mixtures.
4. a kind of preparation method of fresh-keeping two-piece can tinplate, which is characterized in that this approach includes the following steps：
Step 1: prepared by antirust coat (2)：It goes PET nanometer powders after 250 DEG C -270 DEG C dissolve, is added drop-wise to tinplate layer (1) one Side, and by the way that PET solution to be uniformly coated on through hot spin coater on tinplate layer (1), it is 0.1-0.3mm to make PET thickness, is completed The preparation of antirust coat (2)；
Step 2: prepared by the first waterproof layer (3)：Measure the double dimethylaminoethyl ethers and 30wt% dipropylene glycols of 70wt% DPG is uniformly mixed and catalyst is made；Take the catalyst of 3-6wt% that 30-50wt% acrylonitritrile-styrene resins, 50- is added In 70wt% polyester polyol, polyurethane additive is made after stirring evenly；Take 40-60wt% polyurethane additives, and to poly- 20-30wt% polyester polyol, 20-30wt% isocyanates are added in urethane additive, after stirring evenly, are stored at room temperature 60- 80min obtains mixed solution A；
Mixed solution A is brushed in antirust coat (2) upper surface of tinplate by silk-screen printing, 10-20min is stood after printing, It is subsequently placed into drying box and is tentatively toasted 15 minutes through 200 DEG C, using film thickness gauge, measure the thickness of mixed solution A on antirust coat (2) Degree；Repeatedly printing, preliminary baking, until the thickness of mixed solution A is 0.1-0.3mm, then toasts through 200 DEG C of 120-150min, Complete the preparation of the first waterproof layer (3)；
Step 3: prepared by the second waterproof layer (4)：Mixed solution A is coated on using silk-screen printing in tinplate layer (1) other side Tinplate layer (1) other side, by repeatedly printing, tentatively toast after, be made thickness be 0.2-0.4mm the second waterproof layer (4)；
Step 4: the preparation of fresh-keeping layer (5)：Dry lactide is weighed, is added in ethyl acetate solution, is configured to 1-2g/ml, Through heating for multiple times, filtering, recrystallization, collect and crystallized on filter paper, and it is vacuum dried after, obtain white powder B；
10-15wt% initiator both-end hydroxyls PEG is added in three-necked flask, through 100 DEG C of oil bath, continuous vacuum drying 4- 5h；0.2-0.3wt% octoate catalysts stannous, 80-90wt% white powder B is then added, after three-necked flask vacuumizes, is filled with Argon gas；120 DEG C are then raised temperature to, 24 hours are kept the temperature, through ring-opening reaction；After reaction, by centrifugation product, chlorine is added It is imitative, after being completely dissolved, absolute ethyl alcohol is added dropwise, generates white depositions, when white depositions are not further added by, filtration drying Afterwards, block copolymer white depositions C is obtained；
Block copolymer white depositions C is uniformly sprinkling upon the second waterproof layer (4) upper surface, the uniform hot pressing of flat platen is used in combination, 200-220 DEG C of heating temperature, the hair after the C dissolvings of block copolymer white depositions in the second waterproof layer (4) and flat platen Under thin phenomenon effect, fresh-keeping layer (5) is formed；
Step 5: the preparation of antibiotic layer (6)：
By AgNO3With N vinylamide polymer in molar ratio 1:It is molten that N vinylamide polymer-ethyl alcohol is added in 7-8 2-3h, subsequent AgNO are mixed in liquid and under condition of ice bath3It is 1 in molar ratio with HCl:1.5-2 being added in HCl；It is keeping away 12h is stirred under the conditions of light, obtains AgCl colloidal sols, is birdsed of the same feather flock together then to the N- vinylamides in AgCl solution, adding 0.15wt% Object-ethanol solution is closed, stirring is for 24 hours；
It is 1-4 by volume again:1:1 ratio is by above-mentioned AgNO3Solution, above-mentioned HCl solution are added to SiO2In colloidal sol, mixing It is spin-coated in fresh-keeping layer (5) after uniformly, after 200-220 DEG C of baking, obtains SiO2- AgCl films, thickness 0.2- 0.3mm。
5. a kind of preparation method of fresh-keeping two-piece can tinplate according to claim 3, which is characterized in that the AgNO3 With the AgNO of a concentration of 0.3-0.4mol/L3Solution；The HCl is the HCl solution of concentration 0.15-0.2mol/L.
CN201810394279.4A 2018-04-27 2018-04-27 A kind of fresh-keeping two-piece can tinplate and preparation method thereof Pending CN108745836A (en)

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CN101606537A (en) * 2009-06-23 2009-12-23 哈尔滨工业大学 A kind of SiO 2The preparation method of-AgCl composite antibacterial thin films
CN106742699A (en) * 2016-12-20 2017-05-31 江苏百瑞尔包装材料有限公司 A kind of tinplate overlay film of corrosion resistance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101606537A (en) * 2009-06-23 2009-12-23 哈尔滨工业大学 A kind of SiO 2The preparation method of-AgCl composite antibacterial thin films
CN106742699A (en) * 2016-12-20 2017-05-31 江苏百瑞尔包装材料有限公司 A kind of tinplate overlay film of corrosion resistance

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吴景梅等: "《食品包装学》", 中国轻工业出版社, pages: 114 - 115 *

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