Coating type multi-layer composite high-barrier film as well as preparation method and application thereof
A high-barrier film, multi-layer composite technology, applied in the field of material processing, can solve the problems of decreased barrier performance, easy water absorption of the film, and inability to melt processing, etc. Effect of Chemical Auxiliary Migration
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[0037] Example 1
[0038] Weigh 45 parts by weight of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., grade 1799), 5 parts by weight of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., grade 1099), and polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd. Company, brand number 1799) 5 parts by weight, 15 parts by weight of sorbitol, 10 parts by weight of diglycerin, 5 parts by weight of tannic acid, and 1 part by weight of calcium chloride are added to the mixer and mixed thoroughly to obtain a premix; Then plasticize the premix in an oven at 60°C for 3 hours; finally, the plasticized premix and 20 parts by weight of ethylene / vinyl alcohol copolymer (Changchun Petrochemical Co., Ltd., brand EV4405, ethylene content 44mol% ) Is mixed and put into a single screw extruder for granulation to obtain PVA-EVOH barrier layer resin 1 .
Example Embodiment
[0039] Example 2
[0040] Weigh 45 parts by weight of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., grade 1799), 5 parts by weight of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., grade 1099), and polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd. Company, brand number 1799) 5 parts by weight, 15 parts by weight of sorbitol, 10 parts by weight of diglycerin, 5 parts by weight of tannic acid, and 1 part by weight of calcium chloride are added to the mixer and mixed thoroughly to obtain a premix; Then plasticize the premix in an oven at 60℃ for 3 hours; finally, the plasticized premix and ethylene / vinyl alcohol copolymer (Changchun Petrochemical Co., Ltd., brand EV3801, ethylene content 38mol%) 20 weight Parts are mixed and put into a single screw extruder for granulation to obtain PVA-EVOH barrier layer resin 2 .
Example Embodiment
[0041] The structural formula of the composite film of Example 3 is expressed as follows:
[0042] PE / PVA-EVOH / clay coating liquid 1 / adh / PE,
[0043] Introduce 3% sodium-based montmorillonite PVA-EVOH barrier layer resin 1 Modification prepared in solution PVA-EVOH / clay coating Liquid 1 ;
[0044] Will be modified PVA-EVOH / clay coating liquid 1 Coated directly on the film surface of the PE substrate that has undergone corona (2000W) surface treatment, and then undergoes electron beam crosslinking (electron beam energy 800Kev) after drying;
[0045] A water-based polyurethane adhesive containing 7% modified montmorillonite is coated on the side of the surface layer of the PE substrate, and after drying, it is combined with the electron beam cross-linked film.
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