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Ethylene-vinyl alcohol copolymer particles, process for their preparation and extrusion molded films produced therefrom

A vinyl alcohol copolymer, particle technology, applied in chemical instruments and methods, layered products, packaging item types, etc., can solve the problems of high procedure cost, high oxygen barrier, reduced heat resistance and other characteristics, etc. Good oxygen barrier properties, increased delivery stability, and improved delivery efficiency

Active Publication Date: 2021-05-18
CHANG CHUN PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another attempt to extrude EVOH resin is as described in Chinese Patent Publication No. CN1262595C, which feeds EVOH resin into an extruder, maintains the temperature of the molten resin at 70 to 170°C, and extrudes Extruder water supply or drainage to adjust the amount of water; add alkali metal salt or alkaline earth metal salt to the extruder to control the water content; however, since ethylene-vinyl alcohol copolymer is a hydrophilic material, ethylene-vinyl alcohol copolymer resin must Drying before the extrusion process; in addition to the high process cost of this method, the additives and water content of the extruder may reduce the heat resistance and other characteristics of the final product
[0007] Therefore, to date there is no known method of improving the stability of EVOH pellet delivery to the extruder to produce high quality films without holes, thinning or translucent irregularities, with high oxygen barrier properties

Method used

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  • Ethylene-vinyl alcohol copolymer particles, process for their preparation and extrusion molded films produced therefrom
  • Ethylene-vinyl alcohol copolymer particles, process for their preparation and extrusion molded films produced therefrom
  • Ethylene-vinyl alcohol copolymer particles, process for their preparation and extrusion molded films produced therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] 1. Basis figure 1 The general preparation shown produces an ethylene-vinyl acetate copolymer (EVAc) having an ethylene content of 32 mol%. After saponifying the ethylene-vinyl acetate copolymer (EVAc) into ethylene-vinyl alcohol copolymer (EVOH), the EVOH is dissolved in a solution of methanol (MeOH) / water (ratio 70:30) to mix into EVOH / A solution of methanol / water (the solid content of the solution is 41% by weight), and the solution is stored at 60° C. to carry out the granulation process.

[0079] 2. After the above-mentioned EVOH solution is pumped into the feeding pipe at a flow rate of 120L / min, the EVOH solution passes through an input pipe with a diameter of 2.8mm, and is cut by a rotary knife at 1500rpm. At the same time, the temperature of the particles is cooled to 5°C to form EVOH particles.

[0080] 3. The particles obtained above are centrifuged to separate EVOH particles, and the separated EVOH particles are washed with water and dried to obtain the fin...

Embodiment 2

[0099] Change four kinds of independent variables of embodiment 1: (1) in the solution, the solid content of this EVOH is 39 weight percent, (2) the diameter of input pipe is 1.6mm, (3) the rotating speed of rotary knife is set as 2,500rpm , (4) use the ASTM E11 mesh size to sieve the EVOH particles with a 10-mesh sieve, and other control variables are the same as in Example 1.

Embodiment 3

[0101] Change four kinds of independent variable items of embodiment 1: (1) in the solution, the solid content of this EVOH is 38 weight percent, (2) the diameter of delivery pipe is 2.4mm, (3) the rotating speed of rotary knife is set as 1,800rpm , (4) use the ASTM E11 mesh size to sieve the EVOH particles with a 10-mesh sieve, and other control variables are the same as in Example 1.

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Abstract

An ethylene-vinyl alcohol copolymer pellet, a process for preparing the pellet, and an extrusion molded film produced therefrom, wherein the extrusion molded film has substantially no blow holes or thinning -thinning); the extrusion molded film is formed by feeding ethylene-vinyl alcohol copolymer pellets into an extruder, wherein 90-100 weight percent of the pellets pass through an ASTM E11 sieve 5 mesh and the 0-10 weight percent of the granules is smaller than ASTM E11 sieve 10 mesh, so that uniform feeding of the granules can be obtained and no bridging occurs when the granules pass through the extruder.

Description

technical field [0001] The present invention discloses ethylene-vinyl alcohol copolymer (EVOH) granules that improve the delivery efficiency of granules in various types of equipment, such as extruders. The disclosed pellets (or pellets) avoid feed problems such as pellet bridging in the hopper and delivery areas of typical extruders, thereby increasing delivery stability at the extrusion die. The extrusion molded film of the disclosed embodiments of the present invention does not have blow holes or film-thinning in the final product. The improved film performed well in oxygen barrier properties. The particles of the disclosed embodiments may also be used in coextruded embodiments. The method for producing ethylene-vinyl alcohol copolymer particles disclosed in the present invention is different from the prior art that uses two production lines, and because the EVOH particles are cut in water, it is different from the hot-cutting method that will Finished pellets with diffe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08J3/12C08J5/18B32B27/08B32B27/30B32B27/32
CPCC08J3/12C08J5/18B32B27/08B32B27/30B32B27/32C08J2329/04B32B2250/24B29B9/065B29B9/12B29B7/842B29B7/46B29B7/42B29B7/428B29B9/16B29B2009/168C08F216/06B32B27/304B32B2307/7244B32B2307/518B32B7/12B32B2439/70B32B2307/516B32B2250/05B32B27/34B32B27/306C08F210/02B29K2023/086B29B9/06
Inventor 张鸿铭林文星梁志杰许嘉豪
Owner CHANG CHUN PETROCHEMICAL CO LTD