Ethylene-vinyl alcohol copolymer resin particles, method for forming same, film formed therefrom, and multilayer structure
A resin particle, vinyl alcohol technology, applied in synthetic resin layered products, chemical instruments and methods, layered products, etc., can solve the problems of poor mechanical properties, poor gas barrier properties, etc.
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Embodiment 1
[0072] Embodiment 1 (preparation formula)
[0073] In order to illustrate that the present invention has certain benefits, the ethylene-vinyl alcohol copolymer (EVOH) formulations of Examples and Comparative Examples were prepared. The EVOH formulations of each example and comparative example were prepared from at least two components. At least two components of the Example and Comparative Example formulations were EVOH polymers or ethylene-vinyl acetate (EVAC) polymers.
[0074] EXAMPLES Formulations A-C were each prepared from two EVAC components with different ethylene contents. Example Formulation D was prepared from three EVAC components, each component having a different ethylene content. EXAMPLES Formulations E and F were each prepared from two EVOH compositions with different ethylene contents.
[0075] Similarly, comparative formulations G, H, and J-L were each prepared from two EVAC compositions having different ethylene contents. Comparative Example Formulation ...
Embodiment 2
[0114] Embodiment 2 (preparation of monolayer, multilayer film and multilayer structure)
[0115] Monolayer and multilayer films were formed using the respective EVOH particles of Example Formulations A-F and Comparative Example Formulations G-M. The EVOH granule of embodiment formula A-F and comparative example formula G-M is sent into single-layer T-die (T-die) casting film extruder (optical control system MEV4) to prepare single-layer film (embodiment film A1-F1 and comparative example membranes G1-M1). The thicknesses of Example films A1-F1 and Comparative example films G1-M1 were 20 μm. Wherein, the temperature of the extruder is set at 220° C., the temperature of the die (ie T-die) is set at 230° C., and the rotation frequency of the screw is 7 rpm.
[0116] For individual EVOH particles, polypropylene and tie layers (e.g. 18729, Arkema Co., Ltd.) to form a multilayer film from the respective EVOH particles of Example formulations A-F and Comparative Example formulat...
Embodiment 3
[0118] Example 3 (Confirmation of Chemical and Physical Properties)
[0119]Analyze the EVOH granule prepared by embodiment formula A-F and comparative example formula G-M and the monolayer film (embodiment film A1-F1 and comparative example film G1-M1), multilayer film (embodiment film A2-M1) that is formed by this EVOH granule F2 and comparative films G2-M2) and multilayer structures (formed into exemplary container shapes) to determine various chemical and physical properties, including gas barrier properties, melting temperature, total light transmittance, and boron content before and after thermoforming. The gas barrier properties of Example Films A1-F1 and Comparative Example Films G1-M1 and Example Films A2-F2 and Comparative Example Films G2-M2 were evaluated by measuring the oxygen transmission rate (OTR) through the films. Use OX-TRAN Model 2 / 22 oxygen transmission rate testing machine (mocon company), according to ISO 14663-2 method, measure the OTR of embodiment fi...
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