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Method for preparing high-barrier polypropylene material through phase morphology and interface crystallization regulation

A polypropylene material and high-barrier technology, which is applied in the field of preparing high-barrier polypropylene materials by controlling phase morphology and interface crystallization, achieves the effects of low manufacturing cost, improved gas barrier performance, and easy mold processing

Active Publication Date: 2018-09-21
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing high-barrier polypropylene materials by adjusting the phase morphology and interface crystallization to solve the problems existing in the existing high-barrier polymers to improve the barrier properties of polypropylene. Fibrous and "interlocked" α-transverse crystal multi-level microstructure

Method used

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  • Method for preparing high-barrier polypropylene material through phase morphology and interface crystallization regulation
  • Method for preparing high-barrier polypropylene material through phase morphology and interface crystallization regulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix the basic salt α-nucleating agent of substituted aryl heterocyclic aluminum phosphate (trade name NA-21) and ethylene-vinyl alcohol copolymer (EVOH) at a weight ratio of 0.5 : 99.5, and then put it into the twin-screw extruder Medium-extrusion granulation to prepare EVOH containing NA-21. Among them, the temperature of each section of the twin-screw extruder is controlled at 180 o C-190 o C-210 o C-210 o C-200 o c. After mixing EVOH containing NA-21 and pure polypropylene at a ratio of 10:90 (by weight), they are put into micro-nano laminated co-extrusion equipment for in-situ microfibrillation, in which the feeding section of the extruder (A, B), the conveying The temperature of section, melting section, homogenization section, layer distributor (D, E), and die (F) is 180 o C. 190 o C. 210 o C. 210 o C. 210 o C. 200 o c. Test the gas barrier properties of extrudates: Compared with pure polypropylene, the oxygen permeability coefficient of the material i...

Embodiment 2

[0029] The sorbitol-based α-nucleating agent (trade name T5688) and polyamide 6 (PA6) were mixed at a weight ratio of 0.7:99.3, and put into a twin-screw extruder for extrusion and granulation to obtain PA6 containing T5688. Among them, the temperature of each section of the twin-screw extruder is controlled at 180 o C-220 o C-230 o C-230 o C-220 o c. After mixing PA6 containing T5688 and pure polypropylene at a ratio of 20:80 (weight ratio), put them into micro-nano laminated co-extrusion equipment for in-situ microfibrillation, where the feeding section, conveying section, The temperatures of melting section, homogenizing section, layer distributor (D, E), and die (F) are respectively 180 o C. 220 o C. 230 o C. 230 o C. 230 o C. 220 o c. The oxygen permeability coefficient of the in-situ microfiber composite is 4.035×10 -16 cm 3 cm / cm 2 · s · Pa.

Embodiment 3

[0031] The sorbitol-based α-nucleating agent (trade name T5688) and polyamide 6 (PA6) were mixed at a weight ratio of 0.7:99.3, and put into a twin-screw extruder for extrusion and granulation to obtain PA6 containing T5688. Among them, the temperature of each section of the twin-screw extruder is controlled at 180 o C-220 o C-230 o C-230 o C-220 o c. After mixing PA6 containing T5688 and pure polypropylene at a ratio of 20:80 (weight ratio), put them into micro-nano laminated co-extrusion equipment for in-situ microfibrillation, where the feeding section, conveying section, The temperatures of melting section, homogenizing section, layer distributor (D, E), and die (F) are respectively 180 o C. 220 o C. 230 o C. 230 o C. 230 o C. 220 o c. Fix the cooled and shaped sample in the mold and put it into 200 o After 10 minutes of oven melting at C, quickly move to 130 o Keep the temperature in an oil bath in C for 4 hours to obtain a heat-treated sample. The oxygen pe...

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Abstract

The invention discloses a method for preparing a high-barrier polypropylene material through phase morphology and interface crystallization regulation. The method is characterized in that a micro-nanolaminating co-extrusion device is utilized for in-situ micro-fibrillation of a high-barrier polymer containing an alpha nucleating agent in polypropylene; phase morphology regulation is organically combined with interface crystallization regulation, and a multi-layer microstructure of oriented microfibers and interlocking alpha transverse crystals is built in the polypropylene; the gas barrier property of the polypropylene is improved by using the multi-layer microstructure. According to the method, the interface structure of the high-barrier polymer and the polypropylene is optimized in an interface crystallization way under the condition without a compatilizer, and the problem is solved that in a common preparation technology, interactions between the interfaces of the high-barrier polymer and the polypropylene are weak, so that further improvement of the gas barrier property is restricted. The devices involved in the method are easy to operate, dies are easy to process, the manufacturing cost is low, continuous production is achieved, the production efficiency is high, and the method has good industrial application prospects.

Description

technical field [0001] The present invention relates to a method for preparing high-barrier polypropylene materials by controlling phase morphology and interface crystallization, more specifically, it relates to the use of micro-nano lamination co-extrusion equipment to realize the production of high-barrier polymers containing α-nucleating agents in pure polypropylene In-situ microfibrillation, this polypropylene in-situ microfiber composite material contains oriented microfibers and a large number of "interlocked" α transverse crystal structures, which belongs to the technical field of polymer material processing. Background technique [0002] Polypropylene (PP) is widely used in the packaging industry because of its non-toxicity, light weight, impermeability, easy processing and low price. However, pure polypropylene material has poor barrier properties to gases such as oxygen and carbon dioxide, which greatly limits its application in food, medicine and other packaging f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L77/02C08K5/00
CPCC08L23/12C08L2205/24C08L23/0846C08K5/0083C08L77/02
Inventor 罗珊珊韦良强孙静黄安荣秦舒浩
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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