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Ethylene-vinyl alcohol copolymer resin composition and multilayer structure

A technology of resin composition and vinyl alcohol, applied in the direction of synthetic resin layered products, coatings, layered products, etc., can solve the problems of quality reduction and thermal deterioration of molded products, and achieve excellent thermal stability and not easily affected by heat Effect

Active Publication Date: 2022-05-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to manufacture various molded products using this EVOH, melt molding such as extrusion molding and injection molding is performed. When melt molding EVOH, the molding temperature is usually high such as 200°C or higher, so thermal deterioration tends to occur, and fish eyes, Gel-like lumps (particles), etc., reduce the quality of molded products

Method used

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  • Ethylene-vinyl alcohol copolymer resin composition and multilayer structure
  • Ethylene-vinyl alcohol copolymer resin composition and multilayer structure
  • Ethylene-vinyl alcohol copolymer resin composition and multilayer structure

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0136] [Preparation of standard solution]

[0137] Weigh cinnamic acid (10.89mg) in a 10mL volumetric flask, dissolve it in methanol, and make a 10mL solution (standard stock solution; 1089μg / mL). Then the prepared standard stock solution was diluted with methanol to prepare various mixed standard solutions of various concentrations (0.109 μg / mL, 0.218 μg / mL, 0.545 μg / mL, 1.09 μg / mL, 2.18 μg / mL). LC / MS / MS analysis was performed using these mixed standard solutions, and a standard curve was prepared.

[0138] [Preparation of sample solution]

[0139] (1) After weighing the EVOH resin composition pellets (1 g) of the present invention into a 10 mL volumetric flask, 9 mL of methanol was added.

[0140] (2) After ultrasonic treatment was performed for 120 minutes, it was left to cool at room temperature (25° C.).

[0141] (3) Methanol was added, and the volume was adjusted to 10 mL (sample solution (I)).

[0142] (4) After taking 1 mL of the sample solution (I) into a 10 mL vo...

Embodiment 1

[0308] Prepare an ethylene-vinyl alcohol copolymer water / methanol mixed solution (water 35 / methanol 65, weight ratio, EVOH resin concentration 40%). And, the solution of this EVOH intermediate is extruded into a strand shape in the water tank that has accommodated cold water, cuts off with a knife after making it solidify, obtains cylindrical EVOH intermediate pellet (with respect to 100 parts of EVOH intermediate, Contains 100 parts of water).

[0309] Then, the above-mentioned EVOH intermediate pellets are dropped into an aqueous solution containing 350 ppm of acetic acid, 370 ppm of sodium acetate, 15 ppm of calcium dihydrogen phosphate, and 57 ppm of boric acid, and after stirring for 1 hour at 30 to 35 ° C, the aqueous solution is replaced. A total of five stirring treatments were performed (first-stage chemical treatment process). In the aqueous solution used in the first-stage chemical treatment step, the weight ratio of the carboxylic acid concentration to the metal io...

Embodiment 2

[0313] In the drying step of the EVOH intermediate pellets of Example 1, except that the drying temperature was changed from 121° C. to 150° C., the same procedure as in Example 1 was performed to obtain an EVOH resin composition. Various measurement results of the obtained EVOH resin composition are shown in Table 1 below.

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PUM

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Abstract

A resin composition comprising an ethylene-vinyl alcohol-based copolymer and a heat stabilizing component, wherein the terminal structure of the ethylene-vinyl alcohol-based copolymer relative to the content (X) of carboxylic acids and the amount of lactone ring The lactone ring content ratio (Y / Z) of the total amount (Z) of the content (Y) is 55 mol% or more, and contains cinnamic acids, lubricants, boron compounds, conjugated At least one of the polyene compounds is used as a heat stabilizing component. The composition is excellent in thermal stability such as being excellent in suppressing pyrolysis even at high temperatures, and does not generate odor or coloring even when processed at high temperatures.

Description

technical field [0001] The present invention relates to an ethylene-vinyl alcohol-based copolymer resin composition, and more specifically, to an ethylene-vinyl alcohol-based copolymer resin composition having excellent thermal stability at high temperatures, not to mention gas barrier properties, and an ethylene-vinyl alcohol-based copolymer resin composition using the same. multilayer structure. Background technique [0002] Ethylene-vinyl alcohol copolymers (hereinafter, sometimes referred to as "EVOH"), especially saponified products of ethylene-vinyl acetate copolymers, are widely used in films, sheets, containers, Various uses such as fibers. [0003] In addition, this saponified product is produced by copolymerizing ethylene and vinyl acetate, removing unreacted vinyl acetate, and then saponifying the obtained ethylene-vinyl acetate copolymer. [0004] In order to manufacture various molded products using this EVOH, melt molding such as extrusion molding and injecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08F8/00C08K5/09
CPCC08F8/00C08K5/09C08K3/38C08K5/20C08K2003/387B32B15/043B32B2307/518B32B27/306B32B27/12B32B27/288B32B25/06B32B5/022B32B27/304B32B15/09B32B27/10B32B27/302B32B2410/00B32B27/308B32B5/024B32B25/08B32B29/005B32B27/22B32B5/26B32B15/085B32B2270/00B32B21/08B32B27/24B32B15/082B32B21/06B32B2437/04B32B25/14B32B2307/516B32B29/02B32B2307/732B32B2262/103B32B15/08B32B27/32B32B7/12B32B27/322B32B15/06B32B15/12B32B2307/734B32B27/34B32B2307/736B32B15/10B32B1/08B32B2255/20B32B2439/70B32B2439/80B32B21/045B32B25/10B32B27/08B32B21/042B32B15/088B32B2307/7244B32B25/042B32B27/36B32B15/14B32B21/10B32B2439/46B32B1/00C08L29/04C08K5/005C08K5/01
Inventor 井上耕太桥本穗果佐藤伸昭
Owner MITSUBISHI CHEM CORP
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