CN111690300A - Barrier coating and high-barrier composite material using same - Google Patents
Barrier coating and high-barrier composite material using same Download PDFInfo
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- CN111690300A CN111690300A CN202010642406.5A CN202010642406A CN111690300A CN 111690300 A CN111690300 A CN 111690300A CN 202010642406 A CN202010642406 A CN 202010642406A CN 111690300 A CN111690300 A CN 111690300A
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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
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
- C09D139/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
- C09D139/02—Homopolymers or copolymers of vinylamine
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- 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
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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
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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Abstract
The invention relates to the field of packaging materials, in particular to a barrier coating and a high-barrier composite material applied by the same. The barrier coating comprises the following raw materials in percentage by mass: 8-20% of polyvinyl alcohol, 1-10% of vinylamine homopolymer, 0.1-0.2% of tetrabutyl titanate, 0.1-0.2% of silicon dioxide and the balance of water. Polyvinyl alcohol, vinylamine homopolymer, tetrabutyl titanate and silicon dioxide in a specific mass ratio are added into water for mixing reaction, so that the effect of modifying the polyvinyl alcohol is achieved, and finally the polyethylene barrier coating with high barrier property is obtained.
Description
Technical Field
The invention relates to the field of packaging materials, in particular to a barrier coating and a high-barrier composite material applied by the same.
Background
The packaging material is used for manufacturing packaging containers, packaging decoration, packaging printing, packaging transportation and the like, and meets the requirements of product packaging, and different articles have different functional requirements on the packaging material due to the difference of characteristics of the articles.
In order to prolong the shelf life of articles such as food and medicine, which have a certain shelf life, the deterioration of the articles is accelerated by absorption of water, and the components in the articles may be oxidized and deteriorated by the entry of oxygen, and therefore, higher requirements are required for barrier performance indexes such as water vapor permeability and oxygen permeability of the packaging material in order to prolong the shelf life of such articles. Currently, they are often packaged in high barrier packaging materials.
However, the existing high-barrier packaging materials mostly adopt aluminum foils as barrier layers, and the existence of the aluminum foils in the packaging materials causes the defects that the packaging materials are difficult to separate, difficult to recycle, difficult to treat wastes and high in cost, and the waste materials are not in accordance with the environmental protection standard during waste material treatment, so that the development of a novel green and environment-friendly barrier material is urgently needed.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that in the prior art, an aluminum foil is used as a barrier layer, the aluminum foil is not easy to recycle, and wastes are difficult to treat, so that a barrier coating and a high-barrier composite material using the barrier coating are provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides a barrier coating, which comprises the following raw materials in percentage by mass:
8-20% of polyvinyl alcohol, 1-10% of vinylamine homopolymer, 0.1-0.2% of tetrabutyl titanate, 0.1-0.2% of silicon dioxide and the balance of water.
The invention also provides a high-barrier composite material which comprises an inner film layer, the barrier coating and the surface printing layer which are sequentially distributed.
Further, the inner film layer is a polyethylene layer.
Further, the inner film layer is prepared by blending polyethylene materials, and comprises the following raw materials in percentage by mass:
50-70% of low-density polyethylene, 20-30% of linear low-density polyethylene, 15-20% of polyolefin elastomer and 5-10% of metallocene polyethylene.
Further, the inner film layer also comprises color master batch with the mass percent of 5-15%.
Further, the thickness of the inner film layer is 20-80 μm.
Further, an adhesive layer is arranged between the barrier coating and the surface printing layer.
Furthermore, the adhesive layer is a double-component solvent-free polyurethane adhesive.
Furthermore, in the bi-component solvent-free polyurethane adhesive, the mass ratio of the main agent to the curing agent is 100: (48-52).
Further, the surface printing layer is a copper plate paper layer.
Further, the high-barrier composite material further comprises a protective layer, wherein the protective layer is arranged on one side, opposite to the barrier coating, of the surface printing layer.
Further, the protective layer is a gloss oil layer.
The technical scheme of the invention has the following advantages:
1. the barrier coating provided by the invention has the advantages of excellent film-forming performance, oil resistance, solvent resistance and better gas barrier performance, the vinylamine homopolymer is used as a curing agent and has the cross-linking reaction with a main agent, so that the coating has strong adhesive force on a base material, good high-temperature resistance and excellent content resistance, tetrabutyl titanate is used as a catalyst and can accelerate the curing speed of PVA, and the addition of silicon dioxide can be used as an anti-sticking agent, so that the phenomenon that the coating is stuck to the back when being coated and rolled (namely, a coated PE film and the other surface are stuck and adsorbed when being rolled) is avoided, and the polyvinyl alcohol, the vinylamine homopolymer, tetrabutyl titanate and silicon dioxide in a specific mass ratio are added into water for mixing reaction to modify the polyvinyl alcohol, so that the polyethylene barrier coating with high barrier performance is finally obtained, compared with aluminum foil, the aluminum foil has the characteristic of easy recovery, and meets the development requirement of green environmental protection.
2. According to the high-barrier composite material provided by the invention, the barrier coating with high barrier property is replaced by the aluminum foil, so that the high-barrier composite material has barrier property, can be easily recycled, and meets the development requirement of green and environment protection.
3. The high-barrier composite material provided by the invention has good low-density polyethylene molding processability, linear low-density polyethylene has good environmental stress crack resistance, impact strength and tear strength, the polyolefin elastomer has good mechanical property and excellent low-temperature heat sealing property, the polyolefin elastomer can provide proper adhesive force so as to adjust the stripping capability of the inner film layer, metallocene polyethylene has good pollution resistance, mechanical property, low-temperature heat sealing property and anti-seepage capability, and the finally obtained inner film layer has good processability, pollution resistance and low-temperature heat sealing property by limiting the proportion of the raw materials, so that the processing application of the high-barrier composite material is facilitated.
4. The high-barrier composite material provided by the invention adopts the bi-component solvent-free polyurethane adhesive, so that no solvent residue exists in the composite film, and the pollution of the solvent to the environment can be avoided.
5. The high-barrier composite material provided by the invention is prepared by coating a layer of white slurry on base paper and performing calendaring, the coated paper has the characteristics of smooth paper surface, higher whiteness, uniform paper fiber distribution, consistent thickness, small flexibility, better elasticity, stronger water resistance and tensile resistance, good ink absorbability and receiving state, good printing adaptability, environmental protection and no toxicity, and the coated paper is used as a surface printing layer and can be beneficial to printing of ink in the high-barrier composite material.
6. The high-barrier composite material provided by the invention can prolong the service life of the high-barrier composite material by arranging the protective layer to protect the surface printing layer.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Examples 1 to 3
Examples 1-3 relate to a barrier coating, the composition of which is specified in table 1.
The barrier coating is prepared according to the following steps:
weighing the required purified water and polyvinyl alcohol according to a proportion, adding the polyvinyl alcohol into the purified water while stirring, then placing the mixture into a drying room with the temperature of 40 ℃, taking out the mixture and stirring the mixture after drying for more than 12 hours, then adding the vinylamine homopolymer, tetrabutyl titanate and silicon dioxide according to the proportion, and adding the mixture while stirring to obtain the coating liquid.
TABLE 1 composition formulation Table for barrier coatings of the examples
Example 4
The embodiment relates to a high-barrier composite material which comprises an inner film layer, a barrier coating and a surface printing layer which are sequentially arranged from inside to outside.
The inner film layer is a polyethylene layer, specifically, the inner film layer is prepared by blending polyethylene materials, and comprises the following raw materials in percentage by mass according to the total mass of the inner film layer: 50-70% of low-density polyethylene, 20-30% of linear low-density polyethylene, 15-20% of polyolefin elastomer and 5-10% of metallocene polyethylene.
Wherein, as an optional choice, in order to make the inner film layer have color, some color masterbatches can be properly added into the middle layer of the inner film layer, the color of the color masterbatches can be selected according to specific requirements, and the addition amount of the color masterbatches is 5-10 wt%.
The low-density polyethylene has good forming processability, the linear low-density polyethylene has good environmental stress crack resistance, impact strength and tear strength, the polyolefin elastomer has good mechanical property and excellent low-temperature heat sealing property, the polyolefin elastomer can provide proper adhesive force so as to adjust the stripping capability of the inner film layer, the metallocene polyethylene has good pollution resistance, mechanical property, low-temperature heat sealing property and anti-seepage capability, and the finally obtained inner film layer has good processing performance, pollution resistance and low-temperature heat sealing property by limiting the proportion of the raw materials, so that the processing application of the high-barrier composite material is facilitated.
In this example, the inner film layer was prepared from 55kg of low density polyethylene, 20kg of linear low density polyethylene, 15kg of polyolefin elastomer, 5kg of metallocene polyethylene, and 5kg of silver color masterbatch blended blown film.
Optionally, the total thickness of the intima layer is 20-80 μm, in this embodiment the intima layer is 42um thick.
Optionally, the barrier coating may be selected from examples 1-3, and in this example, the barrier coating is selected from the barrier coatings provided in example 2. Optionally, the coating weight of the barrier layer is 0.3-1.0g/m calculated by dry area2. In this example, the barrier coating had a thickness of 0.6um and a coating weight of 0.6g/m2。
Optionally, in this embodiment, the surface printing layer is a coated paper layer, the coated paper is prepared by coating a layer of white slurry on base paper and performing calendaring, and has the characteristics of smooth paper surface, higher whiteness, uniform paper fiber distribution, consistent thickness, small flexibility, better elasticity, stronger water resistance and tensile resistance, good ink absorption and receiving state, good printing adaptability, environmental friendliness and no toxicity. Specifically, in the present embodiment, the thickness of the surface printing layer is 65um, and the grammage of the coated paper is 80g/m2。
Optionally, in this embodiment, an adhesive layer is further disposed between the barrier coating and the surface print layer, the adhesive is a two-component solvent-free polyurethane adhesive, and the adhesive layer is disposed to compound the inner film layer and the surface print layer. The main agent of the bi-component solvent-free polyurethane adhesive is polyurethane, the curing agent is isocyanate, and the use ratio (mass ratio) of the main agent to the curing agent is 100: (48-52). In this example, the mass of the main agent was 100kg, and the mass of the curing agent was 50 kg.
The double-component solvent-free polyurethane adhesive can ensure that no solvent remains in the composite film, thereby avoiding the pollution of the solvent to the environment.
In this embodiment, the surface print layer is printed with ink, and in order to protect the ink, a protective layer is further disposed within the high barrier composite material, the protective layer being disposed on a side of the surface print layer opposite to the barrier coating, in this embodiment, the protective layer is a varnish layer, and the ink is disposed between the protective layer and the surface print layer. In this example, the thickness of the varnish layer was 1 μm, and the coating amount was 1.5g/m2。
Alternatively, the high-barrier composite material can be prepared according to the following steps:
s1, printing ink: printing ink on the surface printing layer by using an intaglio printing press, wherein the running speed of the printing press is 100-200m/min, the drying temperature is 30-100 ℃, and the printing surface is determined to be error-free, has no obvious chromatic aberration, is accurate in overprinting and is uniform in ink.
S2, adding a protective layer: and printing the gloss oil on the surface printing layer which is printed by the ink by adopting a gravure printing machine, wherein the printing speed of the printing machine is 100-200m/min, the drying temperature is 70-100 ℃, the gloss oil quantity is qualified, and the gloss oil is uniformly coated.
S3, coating of a barrier coating: coating a barrier material on the inner film layer by adopting a coating machine to form a barrier coating, wherein the coating speed is less than or equal to 150m/min, and the drying temperature is as follows: the first section is 70 ℃, the second section is 85 ℃, and the third section is 75-90 ℃.
S4, compounding: compounding the surface printing layer obtained in the step S2 and the inner film layer obtained in the step S3 by adopting a solvent-free compounding machine, wherein the compounding speed is less than or equal to 400m/min, and adopting a bi-component solvent-free polyurethane adhesive, the temperature in a glue barrel is as follows: a main agent: 40-50 ℃, curing agent 40-50 ℃, and rubber conveying pipe temperature: 40-45 ℃, the temperature of the metering roller is 38-42 ℃, the temperature of the sizing roller is 45-50 ℃, and the bonding temperature is as follows: 40-45 ℃.
S5, curing: and (3) curing the compounded material in a curing chamber at the temperature of 35-40 ℃ for more than or equal to 48 h.
S6, post-processing: and cutting the cured material.
The specific process parameters can be automatically regulated and controlled by production personnel, and the ink, the gloss oil and the barrier coating are only required to be uniformly coated, the thickness meets the requirements, and the inner film layer is precisely attached to the surface printing layer. In this example, the high barrier composite was prepared as follows:
s1, printing ink: printing ink on the surface printing layer by using an intaglio printing press, wherein the running speed of the printing press is 150m/min, the drying temperature is 60 ℃, and the printing plate is determined to be error-free, have no obvious chromatic aberration, be accurate in overprinting and be uniform in ink.
S2, adding a protective layer: and printing the gloss oil on the surface printing layer which is printed by the ink by adopting a gravure printing machine, wherein the printing speed of the printing machine is 150m/min, the drying temperature is 85 ℃, the gloss oil quantity is qualified, and the gloss oil is uniformly coated.
S3, coating of a barrier coating: coating a barrier material on the inner film layer by using a coating machine to form a barrier coating, wherein the coating speed is 150m/min, and the drying temperature is as follows: one section is 70 ℃, the second section is 85 ℃ and the third section is 90 ℃.
S4, compounding: compounding the surface printing layer obtained in the step S2 and the inner film layer obtained in the step S3 by adopting a solvent-free compounding machine, wherein the compounding speed is 400m/min, and the double-component solvent-free polyurethane adhesive is adopted, the temperature in a glue barrel is as follows: a main agent: 45 ℃, curing agent 45 ℃, and rubber conveying pipe temperature: 45 ℃, 42 ℃ of metering roll, 45 ℃ of sizing roll, and bonding temperature: at 45 ℃.
S5, curing: and (3) curing the compounded material in a curing chamber at the temperature of 40 ℃ for 48 h.
S6, post-processing: and cutting the cured material.
Example 5
The present embodiment relates to a high-barrier composite material, and compared with embodiment 4, the present embodiment is different in that:
in this example, the barrier coating used the coating provided in example 1.
Example 6
The present embodiment relates to a high-barrier composite material, and compared with embodiment 4, the present embodiment is different in that:
in this example, the barrier coating used the coating provided in example 3.
Comparative example 1
This comparative example relates to a high barrier composite and differs from example 6 in that the barrier coating is an aluminum foil layer.
Test examples
The high barrier composites provided in examples 4-5 and comparative example 1 were tested for gas barrier properties according to YBB00082003-2015 gas transmission measurements, and the results are shown in table 2.
TABLE 2 gas Barrier Performance test results for examples and comparative examples
As can be seen from table 2, the barrier coating obtained by modifying PVA is applied to the high-barrier composite material, so that the high-barrier composite material having oxygen barrier properties equivalent to those of the material using aluminum foil as the barrier layer is obtained.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (12)
1. The barrier coating is characterized by comprising the following raw materials in percentage by mass:
8-20% of polyvinyl alcohol, 1-10% of vinylamine homopolymer, 0.1-0.2% of tetrabutyl titanate, 0.1-0.2% of silicon dioxide and the balance of water.
2. A high barrier composite comprising an inner film layer, the barrier coating of claim 1 and a surface print layer laid in sequence.
3. The high barrier composite of claim 2, wherein the inner film layer is a polyethylene layer.
4. The high-barrier composite material as claimed in claim 3, wherein the inner film layer is prepared by blending polyethylene materials, and comprises the following raw materials in percentage by mass based on the total mass of the inner film layer:
50-70% of low-density polyethylene, 20-30% of linear low-density polyethylene, 15-20% of polyolefin elastomer and 5-10% of metallocene polyethylene.
5. The high barrier composite of claim 3, wherein the inner film layer further comprises 5-15% by weight of a color masterbatch.
6. The high barrier composite of any one of claims 2-5, wherein the inner film layer has a thickness of 20-80 μm.
7. The high barrier composite of any one of claims 2 to 6, wherein an adhesive layer is further disposed between the barrier coating and the surface print layer.
8. The high barrier composite of claim 7, wherein the adhesive layer is a two-component solvent-free polyurethane adhesive.
9. The high-barrier composite material as claimed in claim 8, wherein in the two-component solvent-free polyurethane adhesive, the mass ratio of the main agent to the curing agent is 100: (48-52).
10. The high barrier composite of any one of claims 2 to 9, wherein the surface printing layer is a coppery paper layer.
11. The high barrier composite of any one of claims 2-10, further comprising a protective layer disposed on a side of the surface print layer opposite the barrier coating.
12. The high barrier composite of claim 11, wherein the protective layer is a varnish layer.
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| CN202010642406.5A CN111690300A (en) | 2020-07-06 | 2020-07-06 | Barrier coating and high-barrier composite material using same |
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| CN202010642406.5A CN111690300A (en) | 2020-07-06 | 2020-07-06 | Barrier coating and high-barrier composite material using same |
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Cited By (1)
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| CN114987017A (en) * | 2022-04-19 | 2022-09-02 | 毕玛时软包装（苏州）有限公司 | Low-migration and high-barrier flexible packaging film and preparation method thereof |
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