CN113999576A - Heat-sealing coating for aluminum foil lunch box and preparation method thereof - Google Patents
Heat-sealing coating for aluminum foil lunch box and preparation method thereof Download PDFInfo
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- CN113999576A CN113999576A CN202111194588.5A CN202111194588A CN113999576A CN 113999576 A CN113999576 A CN 113999576A CN 202111194588 A CN202111194588 A CN 202111194588A CN 113999576 A CN113999576 A CN 113999576A
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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
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/14—Gas barrier composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/30—Applications used for thermoforming
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Abstract
In order to solve the problems of low heat-sealing strength of the heat-sealing material of the conventional aluminum foil lunch box to PP and PE films and poor boiling, steaming and acid resistance, the invention provides a heat-sealing coating for an aluminum foil lunch box, which comprises the following components in parts by mass: 40-60 parts of polyolefin dispersion; 4-8 parts of a curing agent; 15-25 parts of tackifying resin; 10-30 parts of deionized water. The invention also provides a preparation method of the heat-seal coating for the aluminum foil lunch box. The heat-seal coating obtained by coating the heat-seal coating on the inner wall of the aluminum foil lunch box and curing has excellent flexibility, meets the tensile deformation capability of the aluminum foil lunch box in use, has excellent high-temperature boiling resistance and acetic acid boiling resistance, can be thermally sealed and bonded with PP and PE film-coated glue at the temperature of 160-230 ℃, and has excellent air tightness of the thermally sealed lunch box.
Description
Technical Field
The invention belongs to the field of metal packaging material coatings, and particularly relates to a heat-sealing coating for an aluminum foil lunch box and a preparation method thereof.
Background
With the stricter requirements of the country and the society on food safety and sanitation and the improvement of consciousness of people on environmental protection and resource saving, the aluminum foil lunch box as a green packaging material is becoming a new choice in the catering industry and the food packaging industry. The aluminum foil lunch box has good sealing performance and can keep the integrity of food, after the food is contained, the food is thermally sealed by a sealing machine, and the food cannot be recovered if people open the food during catering, storage and transportation.
In the prior art, the heat sealing material applied to the aluminum foil lunch box is mainly PP and PE film-coated materials, the PP film has excellent processability and boiling resistance, the PP film-coated aluminum foil can be applied to the lunch box main body and can meet the performance requirements of tensile deformation, no whitening and no falling after being boiled in water at 121 ℃/30min and can meet the tensile deformation in the application process of the aluminum foil lunch box, the PP film-coated materials and the easily-torn cover sealing films which cover the inner wall of the aluminum foil lunch box can realize the heat sealing of the aluminum foil lunch box at 200 ℃ -230 ℃, the sealing performance is excellent, and the two sides of the torn glue layers are uniformly distributed. Therefore, the PP and PE film-coated materials are widely applied to the heat-sealing materials of the current aluminum foil lunch boxes.
However, with the advent of forbidden plastic statutes, aluminum foil lunch boxes using PP and PE films as heat sealing materials on a large scale have failed to meet ever-stricter environmental protection requirements, and will certainly bring great impact on the application of traditional film-coating materials, and many large-scale printing and packaging enterprises are exploring the non-film technology of film-coating process, that is, replacing traditional film-coating with coating. However, the existing system applied to the heat sealing of the aluminum foil lunch box is mostly a hot melt adhesive system, has certain heat sealing performance, but is lack of acid and water resistance, and meanwhile, the heat sealing strength of the aluminum foil lunch box and PP and PE films cannot be guaranteed, so that the multifunctional coating with the heat sealing function for the aluminum foil lunch box has a wide market prospect.
Disclosure of Invention
The invention provides a heat-sealing coating for an aluminum foil lunch box and a preparation method thereof, aiming at the problems that the heat-sealing strength of the heat-sealing material of the conventional aluminum foil lunch box to PP and PE films is not high, and the boiling resistance, the steaming resistance and the acid resistance are poor.
The technical scheme adopted by the invention for solving the technical problems is as follows:
on one hand, the invention provides a heat-sealing coating for an aluminum foil lunch box, which comprises the following components in parts by mass:
optionally, the polyolefin dispersion comprises an anhydride-modified polyolefin dispersion, the anhydride-modified polyolefin dispersion having an acid value of 30-60mg KOH/g and a melting point of 80-160 ℃.
Optionally, the anhydride-modified polyolefin dispersion comprises an anhydride-modified polypropylene dispersion and an anhydride-modified polyethylene dispersion.
Optionally, the curing agent includes at least one of an amino resin, a phenylamino resin, a urea resin, and a glycoluril resin.
Optionally, the curing agent includes at least one of fully methylated amino resin, methylated phenylamino resin, and methylated phenylamino resin.
Optionally, the tackifying resin comprises at least one of an aqueous VAE emulsion and an aqueous rosin ester emulsion.
Optionally, the heat-seal coating for the aluminum foil lunch box further comprises 5-10 parts by mass of a solvent, wherein the solvent comprises n-butyl alcohol.
Optionally, the heat-seal coating for the aluminum foil lunch box further comprises 0.1-0.3 parts by mass of a defoaming agent.
Optionally, the antifoaming agent comprises an acetylenic diol antifoaming agent.
On the other hand, the invention also provides a preparation method of the heat-seal coating for the aluminum foil lunch box, which comprises the following steps:
mixing the polyolefin dispersion and the tackifying resin, and stirring at 400-600rpm for 20-30 min;
and then adding deionized water, n-butanol, a defoaming agent and a curing agent, stirring at 400-600rpm for 20-30min, and filtering with 400-mesh filter cloth to obtain the heat-sealing coating for the aluminum foil lunch box.
The invention has the beneficial effects that: compared with the prior art, the heat-sealing coating for the aluminum foil lunch box can be directly coated on the inner wall of the aluminum foil lunch box, the process is simple, and the film layer after the coating is cured has good flexibility and meets various processing performances of the aluminum foil lunch box; the polyolefin dispersoid is used as main resin, has good compatibility with PP/PE film-coated glue during heat sealing, enhances the peeling strength of the aluminum foil lunch box and the cover film after heat sealing, simultaneously adds the curing agent, and forms a high-strength film layer by crosslinking and curing with the polyolefin dispersoid, further improves the water boiling resistance and acetic acid boiling resistance of the heat-sealing coating, and provides guarantee for food safety; the addition of the tackifying resin can reduce the heat sealing temperature, can finish heat sealing at the temperature of 160-230 ℃, simultaneously enhances the bonding strength of the heat sealing coating and the aluminum foil lunch box, and improves the air tightness of the aluminum foil lunch box after heat sealing. The heat-sealing coating has excellent comprehensive performance, and meets various requirements of the current aluminum foil lunch box on heat sealing, environmental protection and edible safety.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the invention provides a heat-sealing coating for an aluminum foil lunch box, which comprises the following components in parts by mass:
the heat-sealing coating for the aluminum foil lunch box can be directly coated on the inner wall of the aluminum foil lunch box, the process is simple, and a film layer obtained after the coating is cured has good flexibility and meets various processing performances of the aluminum foil lunch box; the polyolefin dispersoid is used as main resin, has good compatibility with PP/PE film-coated glue during heat sealing, enhances the peeling strength of the aluminum foil lunch box and the cover film after heat sealing, simultaneously adds the curing agent, and forms a high-strength film layer by crosslinking and curing with the polyolefin dispersoid, further improves the water boiling resistance and acetic acid boiling resistance of the heat-sealing coating, and provides guarantee for food safety; the addition of the tackifying resin can reduce the heat sealing temperature, can finish heat sealing at 160-230 ℃, simultaneously enhances the bonding strength of the heat sealing coating and the aluminum foil lunch box, and improves the air tightness of the aluminum foil lunch box after heat sealing. The heat-sealing coating has excellent comprehensive performance, and meets various requirements of the current aluminum foil lunch box on heat sealing, environmental protection and edible safety.
In some embodiments, the polyolefin dispersion comprises an anhydride-modified polyolefin dispersion having an acid value of 30 to 60mg KOH/g and a melting point of 80 to 160 ℃.
The polyolefin dispersoid modified by the anhydride is grafted with a carboxylic acid functional group, can directly generate a crosslinking curing reaction with a curing agent without a catalyst, further controls the acid value to be 30-60mg KOH/g, ensures that the cured film layer has excellent flexibility and meets various processing performances of the aluminum foil lunch box, has a melting point of 80-160 ℃, is favorable for reducing the heat sealing temperature, and can complete heat sealing at the temperature of 160-. The use of the catalyst is reduced, so that the production cost is reduced, the safety performance of the film layer is improved, and the requirement on food safety is met.
In some embodiments, the anhydride-modified polyolefin dispersion comprises an anhydride-modified polypropylene dispersion and an anhydride-modified polyethylene dispersion.
The anhydride modified polypropylene dispersoid and the anhydride modified polyethylene dispersoid are compatible with the PP or PE film, so that the heat-seal coating can be well fused with the PP or PE film after being melted, the bonding function is realized, and the sealing property of the heat-sealed aluminum foil lunch box is improved. The anhydride-modified polypropylene dispersion may be exemplified by, but not limited to, YA-6010 and DC1010 from Enegyck, and the anhydride-modified polyethylene dispersion may be exemplified by, but not limited to, SB-1200, SE1200 and SD1200 from Enegyck.
In some embodiments, the curing agent comprises at least one of an amino resin, a phenylamino resin, a urea-formaldehyde resin, and a glycoluril resin.
The amino resin, the phenylated amino resin, the urea resin and the glycoluril resin have functional groups which can be crosslinked and cured with the anhydride modified polyolefin dispersoid, so that the cured film layer has excellent performance, the boiling resistance and the acid-resistant boiling resistance of the heat-seal coating are improved, and the food safety is guaranteed. Examples of such curing agents include, but are not limited to Maprenal MF 985, CE 8824, and Zhan Xin Cymel 303.
In some embodiments, the curing agent comprises at least one of a fully methylated amino resin, a fully etherified phenylamino resin.
In some embodiments, the tackifying resin comprises at least one of an aqueous VAE emulsion, an aqueous rosin ester emulsion.
The addition of the tackifying resin is beneficial to improving the adhesion of the film layer to the aluminum foil substrate and improving the air tightness of the aluminum foil lunch box after heat sealing, and can also reduce the heat sealing temperature, and the heat sealing can be completed at the temperature of 160-230 ℃, so as to reduce the production cost, wherein the tackifying resin can be exemplified by, but not limited to, watt VINNAPAS EP701K, EAF68, 920, and Lautack 790G and 100G.
In some embodiments, the heat-sealing coating for the aluminum foil lunch box further comprises 5-10 parts by mass of a solvent, and the solvent comprises n-butanol.
In some embodiments, the heat-sealing coating for the aluminum foil lunch box further comprises 0.1-0.3 parts by mass of a defoaming agent.
In some embodiments, the antifoaming agent comprises an acetylenic diol antifoaming agent.
The defoaming agent is used for being beneficial to changing the surface tension of the heat-seal coating, reducing bubbles generated in the preparation and application processes of the heat-seal coating and enabling a paint film to obtain good leveling. The defoaming agent may be exemplified by, but not limited to, Surfynol SE-F of air chemical industry.
On the other hand, an embodiment of the invention also provides a preparation method of the heat-seal coating for the aluminum foil lunch box, which comprises the following steps:
mixing the polyolefin dispersion and the tackifying resin, and stirring at 400-600rpm for 20-30 min;
and then adding deionized water, n-butanol, a defoaming agent and a curing agent, stirring at 400-600rpm for 20-30min, and filtering with 400-mesh filter cloth to obtain the heat-sealing coating for the aluminum foil lunch box.
The present invention will be further described with reference to specific examples.
TABLE 1
Example 1
This embodiment is used to illustrate the heat-sealing coating for aluminum foil lunch boxes and the preparation method thereof disclosed by the present invention, and the heat-sealing coating comprises the following steps:
the method comprises the following steps: according to the components and the mass ratio listed in the example 1 in the table 1, the polyolefin dispersion and the tackifying resin are added into a stirrer in the starting state of a mixing kettle, and the mixture is stirred for 20min at 500 revolutions per minute to obtain a mixture.
Step two: deionized water, n-butanol, a defoaming agent and a curing agent were added to the mixture according to the components and mass ratios listed in example 1 in table 1, and dispersed at a rotation speed of 600rpm for 20min to obtain a premix.
Step three: and filtering the premix by using 400-mesh filter cloth to obtain the heat-sealing coating for the aluminum foil lunch box.
Examples 2 to 5
Examples 2 to 5 are provided to illustrate the heat-sealing coating for an aluminum foil lunch box and the preparation method thereof disclosed by the present invention, including most of the operation steps in example 1, and the differences are as follows:
in the first step and the second step, the components and the mass ratio listed in the embodiments 2-5 in the table 1 are adopted to prepare the heat-sealing coating for the aluminum foil lunch box.
Comparative example 1
This comparative example is used for comparative explanation of the heat-sealing coating for aluminum foil lunch box and the preparation method thereof disclosed by the present invention, which comprises most of the operation steps in example 1, except that:
the polyolefin dispersion was 20 parts by mass.
Comparative example 2
This comparative example is used for comparative explanation of the heat-sealing coating for aluminum foil lunch box and the preparation method thereof disclosed by the present invention, which comprises most of the operation steps in example 1, except that:
the polyolefin dispersion was 80 parts by mass.
Performance testing
The following performance tests were performed on the heat-seal coating for aluminum foil lunch boxes prepared in examples 1 to 5 and comparative examples 1 to 2:
preparation of a sample plate: the heat-seal coatings for the aluminum foil lunch boxes of examples 1-5 and comparative examples 1-2 were applied to an aluminum foil substrate with a 14# wire bar, baked at 245 ℃ for 40 seconds, and cured completely to obtain a dry film with a weight of 3-4 gsm. The panels were tested as follows:
boiled blushing test: and (3) boiling the sample plate in water at 121 ℃ for 30min, observing whether the film layer is whitish or not after boiling, and if the film layer is whitish, determining that the film layer is unqualified.
And (3) boiling adhesion testing: the sample was boiled in water at 121 ℃ for 30min, and before and after boiling, the sample was cut with a hundred-grid knife to form a "#" shape, and the sample was torn off with a 3M adhesive tape for 3 times and observed to compare the differences in properties. The grade of the adhesion result is 0-10, wherein the 0 grade represents that 100% of the coating in the area is bonded and is not removed at all, the 1 grade represents that 90% of the coating in the area is bonded and 10% is removed, and the like, the 10 grade represents that the area is completely removed and has no adhesion.
Acetic acid boil blush test: and (3) placing the sample plate in 4% acetic acid, cooking for 4h at 100 ℃, observing whether the film layer is whitened or not after cooking, and determining that the film layer is unqualified if the film layer is whitened.
Acetic acid cooking adhesion test: the sample was placed in 4% acetic acid and cooked at 100 ℃ for 4 hours, and before and after cooking, the sample was cut with a hundred-grid knife to form a "#" shape, and the sample was torn off with a 3M adhesive tape for 3 times and observed to compare the differences in properties. The grade of the adhesion result is 0-10, wherein the 0 grade represents that 100% of the coating in the area is bonded and is not removed at all, the 1 grade represents that 90% of the coating in the area is bonded and 10% is removed, and the like, the 10 grade represents that the area is completely removed and has no adhesion.
Methyl Ethyl Ketone (MEK) resistance test: a1 kg iron hammer is wrapped by 6 layers of gauze, soaked in liquid Methyl Ethyl Ketone (MEK) solvent and moved back and forth to wipe the tested surface, and one time is recorded back and forth until the coating is damaged and the metal substrate is exposed, and the wiping times are recorded as the MEK value.
And (3) testing the adhesion with PP or PE laminating adhesive: referring to a 180-degree peeling strength test method of GB-T2790-1995 adhesives, the sample plate and PP or PE laminating adhesives are made into a 200 mm-25 mm strip, and the strip is bonded at 190 ℃ for 1s under hot pressing and pressure of 0.6Mpa under hot pressing, and after bonding, the 180-degree peeling strength is tested. The performance results of the tests are shown in table 2.
TABLE 2
According to the data in table 2, it can be seen that the heat-seal coating for the aluminum foil lunch box provided by the invention is applied to the aluminum foil substrate, the heat-seal coating can be completely cured into a film within 40s, the cured film layer does not turn white after being boiled in water at 121 ℃ for 30min or being boiled in 4% acetic acid at 100 ℃ for 4h, the physicochemical properties of the film layer are kept good, meanwhile, the adhesion force after being boiled in water or boiled in acetic acid is 0 grade, and the film layer does not fall off. In addition, the peeling strength of the film layer and the PP or PE film-coated adhesive after heat sealing can reach the range of 10-30N/mm, so that the large enough bonding strength of the film layer and the PP or PE film-coated adhesive can be ensured, the problem that the food storage is influenced due to poor air tightness after packaging is avoided, the peeling strength is controlled below 30N/mm, the situation that a sealing cover film is difficult to uncover due to overlarge peeling strength is avoided, and the user experience is further improved.
In conclusion, the heat-sealing coating for the aluminum foil lunch box provided by the invention has excellent comprehensive performance, and meets various requirements of heat sealing, environmental protection and safe use of the current aluminum foil lunch box.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The heat-seal coating for the aluminum foil lunch box is characterized by comprising the following components in parts by mass:
2. a heat-seal coating material for aluminum foil lunch boxes according to claim 1, wherein said polyolefin dispersion comprises anhydride-modified polyolefin dispersion having an acid value of 30-60mg KOH/g and a melting point of 80-160 ℃.
3. A heat seal coating for aluminum foil lunch boxes according to claim 2, wherein said anhydride-modified polyolefin dispersion comprises an anhydride-modified polypropylene dispersion and an anhydride-modified polyethylene dispersion.
4. A heat-seal coating material for aluminum foil lunch boxes according to claim 1, wherein said curing agent comprises at least one of amino resin, phenylated amino resin, urea resin and glycoluril resin.
5. A heat-seal coating material for aluminum foil lunch boxes according to claim 4, wherein said curing agent comprises at least one of fully methylated amino resin, methylated phenylamino resin, and methylated phenylamino resin.
6. A heat seal coating for aluminum foil lunch boxes according to claim 1, wherein said tackifier resin comprises at least one of aqueous VAE emulsion and aqueous rosin ester emulsion.
7. A heat-seal coating for an aluminum foil lunch box as claimed in claim 1, which further comprises 5-10 parts by mass of a solvent, said solvent comprising n-butanol.
8. A heat-seal coating for an aluminum foil lunch box as claimed in claim 1, further comprising 0.1-0.3 parts by mass of a defoaming agent.
9. A heat seal coating for aluminum foil lunch boxes according to claim 8, wherein said defoaming agent comprises acetylene glycol type defoaming agent.
10. A method of preparing a heat sealing coating material for aluminum foil lunch boxes according to any one of claims 1-9, comprising the steps of:
mixing the polyolefin dispersion and the tackifying resin, and stirring at 400-600rpm for 20-30 min;
and then adding deionized water, n-butanol, a defoaming agent and a curing agent, stirring at 400-600rpm for 20-30min, and filtering with 400-mesh filter cloth to obtain the heat-sealing coating for the aluminum foil lunch box.
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| CN202111194588.5A CN113999576A (en) | 2021-10-13 | 2021-10-13 | Heat-sealing coating for aluminum foil lunch box and preparation method thereof |
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| CN202111194588.5A CN113999576A (en) | 2021-10-13 | 2021-10-13 | Heat-sealing coating for aluminum foil lunch box and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114801401A (en) * | 2022-03-23 | 2022-07-29 | 毕玛时软包装（苏州）有限公司 | Clean easy-to-open cover film for liquid packaging |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070037923A1 (en) * | 2003-05-22 | 2007-02-15 | Kenjin Shiba | Aqueous polyolefin resin dispersion, process for producing the same, and water-based coating material comprising the same |
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2021
- 2021-10-13 CN CN202111194588.5A patent/CN113999576A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070037923A1 (en) * | 2003-05-22 | 2007-02-15 | Kenjin Shiba | Aqueous polyolefin resin dispersion, process for producing the same, and water-based coating material comprising the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114801401A (en) * | 2022-03-23 | 2022-07-29 | 毕玛时软包装（苏州）有限公司 | Clean easy-to-open cover film for liquid packaging |
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