High-barrier polyethylene material and preparation method thereof

Abstract

The invention discloses a high-barrier polyethylene material and a preparation method thereof. The preparation method comprises the following steps: subjecting 40 to 60 parts of polyethylene with highmolecular weight and high density, 2 to 3 parts of dilauryl thiodipropionate, 1 to 2 parts of ethoxyamide stearate, 2 to 4 parts of melamine aluminum polyphosphate, 2 to 5 parts of a compatibilizingagent and 8 to 12 parts of talcum powder to mixing under stirring for 5 to 8 minutes, adding an obtained mixture into the first-stage feed inlet of a double screw extruder through a feeding machine ata speed of 0.5 part of the mixture per minute, and carrying out plasticizing modification; and adding 20 to 50 parts of an ethylene-vinyl alcohol copolymer into the second-stage feed inlet of the extruder at a feeding speed of 0.128 to 0.423 part of the ethylene-vinyl alcohol copolymer per minute, wherein the rotating speed of the double screw extruder is 550 to 600 revolutions / minute; the temperature of the first, second and third stages of the extruder is controlled to be 210 to 235 DEG C; and the temperature of the fourth, fifth and sixth stages of the extruder is controlled to be 200 to 220 DEG C. The high-barrier polyethylene material provided by the invention is greatly improved in barrier performance and processing properties, and has excellent performance indexes.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-molecular-weight high-density polyethylene barrier material, and also relates to a preparation method of the high-molecular-weight high-density polyethylene barrier material. Background technique [0002] There are many types of barrier materials for automobiles, including polyamide (PET) materials, polyvinyl alcohol (PVA) materials, polyethylene (PE) and other materials. In Europe, the ECE rules require that the average loss in 8 weeks should not exceed 20g / 24h in an environment of 40°C, and the United States is more stringent. In recent years, with the popularization and application of methanol gasoline, there are not many barrier materials to meet the strong leakage ability of methanol gasoline. Usually, the preparation methods of high-density polyethylene barrier materials mainly include plastic surface treatment technology, multi-layer co-extrusion techno...

AI Technical Summary

Problems solved by technology

The disadvantage of these materials is that the degree of reaction between raw materials is not high, the improvement of mechanical properties and barrier properties is small, and the price and cost are high.

Chinese patent application number CN201710041445.8 disclosed "a PET polyamide barrier material and its preparation method and application" on May 31, 2017. The preparation process is complicated, the process route is long, and it is easy to produce by mixing A and B liquids Chemical waste liquid

Chinese Patent Publication No. CN107141672A disclosed "a high-barrier composition and its preparation method" on September 8, 2017, which improves its barrier properties by adding alkaline inorganic substances in the case of a combination of polyethylene and polyvinyl alcohol. Plasticizing effect to achieve the purpose of improving the barrier, but the barrier effect is not obvious

Chinese patent application number 201010599844.4 disclosed "a polyethylene-based composite barrier material and its preparation method" on July 4, 2012, and Chinese patent application number 201110020749.9 disclosed "HDPE-PA66 composite Barrier materials and their preparation methods are all prepared by impregnating polymer nylon fibers with high-density polyethylene. The preparation process of polymer nylon fibers is relatively complicated, the material compatibility is poor, and the processing performance requirements are high.

However, the adhesion of EVOH resin to most polymers is very poor, and it is necessary to equip necessary compatibilizers and additives to better integrate HMWHDPE and EVOH to achieve a better barrier effect.