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Water-based high-barrier coating liquid and high-barrier film thereof

A high-barrier film and coating solution technology, which is applied in the direction of film/sheet adhesives, coatings, adhesives, etc., can solve the problem of poor compatibility between inorganic nanoparticles and polyvinyl alcohol, and changes in the aggregated structure of polyvinyl alcohol , affecting the transparency of the film, etc., to achieve excellent retort resistance, low requirements for coating equipment, and enhanced compactness

Active Publication Date: 2019-01-25
CHINA LUCKY FILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Water-soluble polymers such as polyvinyl alcohol (PVA) have a large number of hydroxyl groups, and it is easy to form hydrogen bonds within and between molecules, which significantly improves the compactness of the polymer and has excellent barrier properties; but in a humid environment These hydroxyl groups are easy to form hydrogen bonds with water molecules, resulting in changes in the aggregated structure of polyvinyl alcohol (PVA), swelling and shedding of the PVA film layer, which greatly reduces its barrier performance, so water-soluble polymers are used as barrier films for poor water resistance. layer-wide problems
[0006] Chinese patent CN201110004629.X proposes a water-resistant modified polyvinyl alcohol coating solution, which is modified by adding ordinary inorganic nanoparticles to polyvinyl alcohol, but the compatibility between inorganic nanoparticles and polyvinyl alcohol is poor , the preparation process is very difficult, and the coating liquid is not a transparent liquid, which will affect the transparency of the film after coating
[0007] Chinese patent CN200380103536.6 proposes that polyvinyl alcohol modified by metal alkoxide can enhance its gas barrier and water resistance, but the coating solution needs to be stable in strong acid (pH<2), so that the equipment will be corroded during the production process. , greater damage, and pollution to the environment

Method used

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  • Water-based high-barrier coating liquid and high-barrier film thereof
  • Water-based high-barrier coating liquid and high-barrier film thereof
  • Water-based high-barrier coating liquid and high-barrier film thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 50g of PVA (alcoholysis degree 99%, polymerization degree 2400) into 900g water and 50g methanol and stir evenly, first swell in a 50°C water bath for 20min, then stir in a 95°C water bath for 30min to dissolve, and obtain a solid content of 5.0 % PVA solution a1 component.

[0049] Mix 360g of TEOS (purity 99.9%), 170g of methanol, 468g of water, and 2.0g of hydrochloric acid (0.1% by mass fraction) together, stir at room temperature for 1h to carry out hydrolysis and condensation, and obtain a nano-silica dispersion with a solid content of 10.4%. b1 component (as SiO 2 count).

[0050] Mix 30g of A187 (purity 99.9%), 400g of isopropanol, 569g of water, and 1.0g of hydrochloric acid (0.1% by mass fraction) together, stir at room temperature for 1h for hydrolysis, and obtain a coupling agent with a solid content of 2.5%. Hydrolyzate c1 (in YR 3 Si(OH) 3 count).

[0051] Add 700g of 10.4% nano-silica dispersion liquid b1 component and 100g of 2.5% coupling agent...

Embodiment 2

[0054] The preparation method of PVA solution and nano silicon oxide dispersion liquid is identical with embodiment 1.

[0055] Mix 35g of A171 (purity 99.9%), 460g of isopropanol, 504g of water, and 1.0g of hydrochloric acid (0.1% by mass fraction) together, stir at room temperature for 1h for hydrolysis, and obtain a coupling agent with a solid content of 3.4%. Hydrolyzate c2 (in YR 3 Si(OH) 3 count).

[0056] Add 700g of 10.4% nano-silicon oxide dispersion solution b1 component and 100g of 3.4% coupling agent hydrolyzate c2 component in sequence, after stirring rapidly for 20min, add 200g of 5.0% PVA solution a1 component, and continue to rapidly Stir for 30 minutes, and add 10g of retarding crosslinking agent sodium sulfate, 5g of leveling agent Silok8000, and 5g of adhesion promoter Silok628 at the same time to obtain high barrier coating solution TC-2.

[0057] On a micro-gravure coater, apply TC-2 coating liquid on the surface of the coating layer on which the base f...

Embodiment 3

[0059] The preparation method of PVA solution and nano silicon oxide dispersion liquid is identical with embodiment 1.

[0060] Mix 29g of A174 (purity 99.9%), 470g of isopropanol, 500g of water, and 1.0g of hydrochloric acid (0.1% by mass fraction) together, stir at room temperature for 1h for hydrolysis, and obtain a coupling agent with a solid content of 2.4%. Hydrolyzate c3.

[0061] Add 700g of 10.4% nano-silica dispersion solution b1 component and 100g of 2.4% coupling agent hydrolyzate c3 component in sequence, after stirring rapidly for 20min, add 200g of 5.0% PVA solution a1 component, and continue to rapidly Stir for 30 minutes, and at the same time add 10 g of retarding crosslinking agent sodium sulfate, 5 g of leveling agent Silok8000, and 5 g of adhesion promoter Silok628 to obtain high barrier coating solution TC-3.

[0062] On a micro-gravure coater, apply TC-3 coating liquid on the surface of the coating layer whose base film is 12 μm PET and has deposited 30 ...

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Abstract

The invention discloses water-based high-barrier coating liquid and a high-barrier film thereof. The coating liquid is prepared from a water-soluble polymer, nanometer oxide, a coupling agent and a delaying cross-linking agent, and is specifically prepared from the following components in percentage by weight: 0.5-15% of water-soluble polymer, 0.1-15% of nanometer oxide, 0.01-5% of a coupling agent, 0.01-3% of a delaying cross-linking agent, 0.01-1.5% of an auxiliary agent and 60.5-99.37% of a solvent, wherein the water-soluble polymer is a water-soluble polymer with hydroxyl, the nanometer oxide is prepared by carrying out hydrolysis-condensation on metal alkoxide by adopting a sol-gel method under an acid catalysis condition, and the coupling agent is an organic siloxane coupling agent.The prepared high-barrier coating liquid is excellent in performance and can be used as a barrier layer independently or can be used in combination with an inorganic deposition layer, so that excellent barrier performance can be achieved, and the coating liquid can be used for food packaging, medicine packaging, electronic packaging and the like.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to an aqueous high-barrier coating solution for packaging films. Background technique [0002] In order to avoid the deterioration of the contents of the packaging and maintain its functions and performance, the packaging materials used for food, medicine and electronic items are required to have the ability to prevent the deterioration of the contents of the packaging caused by the passage of gases (such as oxygen, water vapor, etc.) through the packaging materials. Therefore, packaging materials are required to have sufficient gas barrier properties. [0003] At present, the widely used gas barrier materials include polyvinylidene chloride polymer PVDC film, multilayer co-extruded EVOH, evaporated oxide barrier packaging film, metal foil or metallized film and other materials. PVDC film is vinylidene chloride polymer, which is a kind of high barrier resin, its O 2 The transmis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04C09D7/61C09D7/63C08J7/04C09J7/29C09J7/30C08L67/02
CPCC08J2367/02C08K2201/011C09D129/04C09J2433/00C09D7/61C09D7/63C09J7/29C09J7/30C08J7/0423C09J2301/122C09J2301/16C08K3/36
Inventor 刘军虎纪雪梅郑燕冯铭竹刘贤豪宋鑫
Owner CHINA LUCKY FILM CORP
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