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EVA (Ethylene Vinyl Acetate) hot melt adhesive film with high water vapor barrier property and preparation method thereof

A technology of water vapor barrier and hot melt adhesive film, which is applied in the direction of film/sheet without carrier, adhesive, polymer adhesive additive, etc. It can solve the problems of poor water vapor barrier performance, insufficient water vapor barrier effect, moldy tea products, etc. , to achieve the effect of improving the water barrier performance

Pending Publication Date: 2022-05-13
GUANGDONG HUIQI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The EVA hot-melt adhesive film in the traditional technology has a strong hydrophilicity, which leads to its poor water vapor barrier performance. For products that require high airtightness, such as tea, the water vapor barrier effect is not good enough, which may easily lead to moldy tea products and other defects. impact, there is currently no better solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high water vapor barrier EVA hot melt adhesive film, comprising the following components by weight:

[0028] EVA main resin 30-50 parts; PAE resin 5-10 parts; tung oil 10-15 parts; urethane-bonded polyisocyanate compound 1-5 parts; tackifier 3-10 parts; initiator 0.1-1 part; Antioxidant 0.01-1 part.

[0029] The preparation method of the EVA hot-melt adhesive film of this high water vapor barrier property comprises following preparation steps:

[0030] S1: Add EVA main resin, PAE resin, tung oil, polyisocyanate compound with urethane bond, tackifier, initiator and antioxidant into a high-speed mixer and mix evenly to obtain a mixed material;

[0031] S2: put the mixed material into the screw extruder, melt and extrude at 180°C, and go through the steps of spreading, cooling, drawing and winding to obtain an EVA hot-melt adhesive film with high water vapor barrier property.

[0032] Example 1

[0033] A high water vapor barrier EVA hot melt adhesive film, comprising...

Embodiment 2

[0039] A high water vapor barrier EVA hot melt adhesive film, comprising the following components by weight:

[0040] 40 parts of EVA main resin; 7 parts of PAE resin; 13 parts of tung oil; 3 parts of polyisocyanate compound with urethane bond; 6 parts of tackifier; 0.5 part of initiator; 0.5 part of antioxidant.

[0041] The preparation method of the EVA hot-melt adhesive film of this high water vapor barrier property comprises following preparation steps:

[0042] S1: Add EVA main resin, PAE resin, tung oil, polyisocyanate compound with urethane bond, tackifier, initiator and antioxidant into a high-speed mixer and mix evenly to obtain a mixed material;

[0043] S2: put the mixed material into the screw extruder, melt and extrude at 180°C, and go through the steps of spreading, cooling, drawing and winding to obtain an EVA hot-melt adhesive film with high water vapor barrier property.

Embodiment 3

[0045] A high water vapor barrier EVA hot melt adhesive film, comprising the following components by weight:

[0046] 50 parts of EVA main resin; 10 parts of PAE resin; 15 parts of tung oil; 5 parts of polyisocyanate compound with urethane bond; 10 parts of tackifier; 1 part of initiator; 1 part of antioxidant.

[0047]The preparation method of the EVA hot-melt adhesive film of this high water vapor barrier property comprises following preparation steps:

[0048] S1: Add EVA main resin, PAE resin, tung oil, polyisocyanate compound with urethane bond, tackifier, initiator and antioxidant into a high-speed mixer and mix evenly to obtain a mixed material;

[0049] S2: put the mixed materials into the screw extruder and melt and extrude at 180°C, and then go through the steps of spreading, cooling, pulling and winding to obtain an EVA hot-melt adhesive film with high water vapor barrier property.

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Abstract

The invention discloses an EVA (Ethylene Vinyl Acetate) hot melt adhesive film with high water vapor barrier property and a preparation method thereof. The EVA hot melt adhesive film comprises 30-50 parts of EVA matrix resin; 5 to 10 parts of PAE resin; 10 to 15 parts of tung oil; 1 part to 5 parts of a polyisocyanate compound with a carbamate bond; 3 to 10 parts of a tackifier; 0.1 to 1 part of an initiator; and 0.01 to 1 part of an antioxidant. According to the EVA hot melt adhesive film disclosed by the invention, the PAE resin can form a water-resistant structure in the EVA main body resin through self bridging, so that the water barrier property of the hot melt adhesive film is improved; the tung oil has large molecular weight and ester groups, so that a waterproof film layer can be formed on the surface of the hot melt adhesive film, and the water barrier property of the hot melt adhesive film is further improved; under the action of the polyisocyanate compound of the carbamate bond and the initiator, all the materials can be fused with one another, and meanwhile, a hard chain segment and a soft chain segment are provided, so that the waterproof and breathable effects can be achieved.

Description

technical field [0001] The invention relates to the technical field of EVA hot-melt adhesives, in particular to an EVA hot-melt adhesive film with high water vapor barrier property and a preparation method thereof. Background technique [0002] Hot melt adhesive film is a film product with or without release paper, which can be conveniently operated continuously or intermittently, and can be widely used in bonding various fabrics, papers, polymer materials and metals. EVA hot melt adhesive film is a hot melt adhesive film product made of ethylene-vinyl acetate copolymer as the main raw material. The English abbreviation of ethylene-vinylacetate copolymer (ethylene-vinylacetate copolymer) is EVA, which is formed by the copolymerization of ethylene and vinyl acetate. It is an odorless, tasteless, non-toxic white or light yellow polymer. Due to the high cohesion of EVA and the small melting surface tension, it has thermal adhesion to almost all substances. The bonding range is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/10C09J7/30C09J123/08C09J177/00C09J191/00C09J175/04C09J11/08
CPCC09J7/10C09J7/30C09J123/0853C09J11/08C08L2201/14C09J2301/304C08L77/00C08L91/005C08L75/04
Inventor 宾家荃宾家齐
Owner GUANGDONG HUIQI NEW MATERIAL CO LTD