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Method for preparing polyolefin-based barrier material product

A barrier material and polyolefin-based technology, which is applied in the field of preparation of polymer-based composite products, can solve the problems of simple shape and single type, and achieve the effects of low cost, improved mechanical properties, and extended diffusion path

Active Publication Date: 2012-02-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a new method for preparing polyolefin-based barrier material products in view of the current situation of the current method for preparing polyolefin-based barrier material products, so as to solve the problem of single types and simple shapes of polyolefin-based barrier material products prepared in the prior art The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mass ratio of high-density polyethylene, nylon 6 and polyethylene grafted maleic anhydride is 70: 25: 5, and polyethylene grafted maleic anhydride and nylon 6 are added to an extruder in the micro-layer co-extrusion equipment together. The micro-layer co-extrusion pellets obtained by micro-layer co-extrusion and pellet processing have a length and width of 2 mm, and the thickness of nylon 6 sheets in the micro-layer co-extrusion pellets is 0.01 mm. The molding method is compression molding, and the molding temperature is At 200°C, the oxygen permeability coefficient of the product is 2.7cm 3 ·cm·10 -16 / cm 2 ·Pa·s, compared with products prepared by ordinary methods, the barrier performance is increased by 115 times.

Embodiment 2

[0033] The mass ratio of polypropylene, ethylene-vinyl alcohol copolymer and polypropylene grafted maleic anhydride is 65:15:20, and polypropylene and polypropylene grafted maleic anhydride are added together to extrude one of the microlayer co-extrusion equipment Machine, the micro-layer co-extrusion pellets obtained by micro-layer co-extrusion and pellet processing, the length and width are 4mm, the thickness of the ethylene-vinyl alcohol copolymer sheet in the micro-layer co-extrusion pellets is 0.02mm, the molding method For injection molding, when the molding temperature is 220°C, the oxygen permeability coefficient of the product is 3.2cm 3 ·cm·10 -16 / cm 2 ·Pa·s, compared with products prepared by ordinary methods, the barrier performance is increased by 95 times, and the impact strength is increased by 6 times.

Embodiment 3

[0035] The mass ratio of linear low density polyethylene, ethylene-vinyl alcohol copolymer and polyethylene grafted maleic anhydride is 70:25:10, and ethylene-vinyl alcohol copolymer and polyethylene grafted maleic anhydride are added together for micro-layer coextrusion One extruder in the equipment, the micro-layer co-extrusion pellets obtained by micro-layer co-extrusion and pellet processing, the length and width are 1mm, the ethylene-vinyl alcohol copolymer sheet in the micro-layer co-extrusion pellets The thickness is 0.005mm, the molding method is blow molding, and when the molding temperature is 230°C, the oxygen permeability coefficient of the product is 1.7cm 3 ·cm·10 -16 / cm 2 ·Pa·s, compared with products prepared by ordinary methods, the barrier performance is increased by 90 times.

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Abstract

The invention discloses a novel method for preparing a polyolefin-based barrier material product, which is characterized in that: a micro-layered coextrusion method is combined with the methods such as mold pressing, injection molding, blow molding or extrusion molding and the like to prepare the polyolefin-based barrier material products with different shapes. The micro-layered coextrusion can effectively control a lamellar morphological structure and a length-diameter ratio of a barrier phase, and the mold pressing, the injection molding, the blow molding or the extrusion molding has diversity, so the method not only can compensate the single type of the product which is prepared through the micro-layered coextrusion method, but also overcomes the defect that in the traditional mold pressing, the injection molding, the blow molding or the extrusion molding, a lamella blend of the product cannot be molded on an original position. The prepared polyolefin-based barrier material product has a parallel lamella structure, the lamella structure of the high aspect ratio of the barrier phase can greatly lengthen a diffusion path of small molecules, so the barrier property of the material can be greatly improved, or the consumption of the barrier polymer can be remarkably reduced on the premise of reaching the same barrier effect, and the cost can be saved. At the same time, the mechanical property of the material can be remarkably improved.

Description

technical field [0001] The invention relates to a preparation technology of a polymer-based composite material product, more specifically a method for preparing a plastic product by using a polymer with high barrier performance to improve the barrier performance of polyolefin. Background technique [0002] With the rise of my country's plastic packaging industry, polyolefins such as polyethylene and polypropylene are widely used as packaging barrier materials due to their good processing properties, mechanical properties, light weight and low price. Polyolefin is a non-polar polymer, which has good barrier properties to water and polar solvents, but poor barrier properties to non-polar gases and solvents such as oxygen and oil. Therefore, in actual use, polyolefin materials often cannot meet our needs. We need to use some polymers with good barrier properties to non-polar gases and solvents to modify them by blending to improve the comprehensive barrier properties of polyole...

Claims

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Application Information

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IPC IPC(8): B29C69/00C08L23/06C08L77/02C08L51/06C08L23/12C08L23/08C08L67/02
Inventor 李姜戴莹莹郭少云
Owner SICHUAN UNIV
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