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Multilayer polymer compound packaging material with with nano layer texture and its processing method

A technology for composite packaging materials and processing methods, which is applied in the field of high molecular polymer composite packaging materials and their processing, can solve the problems that polyolefin packaging materials are difficult to meet high moisture barrier performance, and have limited moisture barrier performance, so as to improve physical and mechanical strength , improved modulus and ductility, and high bond strength

Inactive Publication Date: 2005-11-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, polyolefin polymers can be used as moisture-proof and moisture-barrier packaging materials, but their moisture-barrier performance is limited. When the content requires high moisture-barrier performance, it is difficult for polyolefin packaging materials formed according to conventional methods to meet the requirements of high moisture-barrier performance

Method used

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  • Multilayer polymer compound packaging material with with nano layer texture and its processing method
  • Multilayer polymer compound packaging material with with nano layer texture and its processing method
  • Multilayer polymer compound packaging material with with nano layer texture and its processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Polymer material: The polymer combination is high-density polyethylene / isotactic polypropylene (HDPE / iPP);

[0033]2. Melt extrusion: The polymer (HDPE) forming the epiphytic phase (A) and the polymer (iPP) forming the base phase (B) are respectively melted and plasticized by two twin-screw extruders, wherein the extrusion of HDPE The temperature is: 190°C, and the extrusion temperature of iPP is 220°C. The extruded melt melted and plasticized by the extruder enters the micro-layer co-extrusion process;

[0034] 3. Micro-layer co-extrusion: The melt of HDPE / iPP is synchronously fed into a design with three-layer co-extrusion mold and 4-channel 5-level multiplier superimposed by two extruders with a flow rate ratio of 10:90. In the micro-layer co-extrusion head, the two melt streams are merged in the co-extrusion die to form a three-layer melt tablet, and the extruded melt tablet enters a 5-level multiplier for 5 divisions-overlap- Convergence increases the number o...

Embodiment 2

[0041] 1. Polymer material: The polymer combination is linear low density polyethylene / isotactic polypropylene (LLDPE / iPP);

[0042] 2. Melt extrusion: The polymer (LLDPE) forming the epiphytic phase (A) and the polymer (iPP) forming the base phase (B) are respectively melted and plasticized by two twin-screw extruders, wherein the extrusion of LLDPE The temperature is: 160°C, and the extrusion temperature of iPP is 200°C. The extruded melt melted and plasticized by the extruder enters the micro-layer co-extrusion process;

[0043] 3. Micro-layer co-extrusion: two extruders synchronously feed the LLDPE / iPP melt into a three-layer co-extrusion mold with a flow rate ratio of 40:60. In the micro-layer co-extrusion head, the two melt streams are merged in the co-extrusion die to form a three-layer melt tablet, and the extruded melt tablet enters a 4-stage multiplier for 4 divisions-overlap- Convergence increases the number of layers of the melt sheet and reduces the thickness of...

Embodiment 3

[0050] 1. Polymer material: The polymer combination is isotactic polypropylene and polyamide 6 (iPP / PA6);

[0051] 2. Melt extrusion: The polymer isotactic polypropylene (iPP) forming the epiphytic phase (A) and the polymer polyamide 6 (PA6) forming the basal phase (B) are respectively melt-molded by two single-screw extruders. Hua, wherein the extrusion temperature of iPP is 220°C, and the extrusion temperature of PA6 is 260°C. The melt extruded by two extruders enters two melt pumps respectively, among which, the melt pump temperature of iPP is 220°C, and the melt pump temperature of PA6 is 260°C;

[0052] 3. Micro-layer co-extrusion: The melt of iPP / PA6 is synchronously sent into a mold designed with three layers of co-extrusion by two melt pumps with a flow rate ratio of 50:50, and then enters 5 stages, 4 channels and finally The first order is in the microlayer co-extrusion head composed of layer multipliers superimposed with 2 channels and 1 order. In the co-extrusion ...

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Abstract

A packing multi-layer polymer container with nano-layer texture is prepared from two polymers able to generate non-parallel cross texture of heterophase epiphytic crystals through microlayer coextruding, cooling, heat treating and thermal stretching. Its advantages are high strength and ductility and very high isolating performance and corrosion resistance.

Description

[0001] 1. Technical field. [0002] The invention belongs to the technical field of high-molecular polymer material processing, and more specifically relates to a high-molecular polymer composite packaging material requiring high strength and high barrier properties and a processing method thereof. 2. Background technology [0003] Polymer packaging materials are widely used in packaging fields such as food, beverages, pharmaceuticals, chemical products, mechanical and electronic devices, instruments and meters, and military products. Many foods, beverages and medicines are prone to corruption, taste, color and deterioration under the action of oxygen and other gases, so their packaging materials are required to have sufficient barrier properties to oxygen and other gases. Polyethylene terephthalate (PET), polyethylene terephthalate / ethylene vinyl alcohol copolymer (PET / EVOH) multilayer composite material, polyethylene terephthalate / polyamide (PET / PA) multilayer composite ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D65/40
Inventor 陈利民李泽琼
Owner SICHUAN UNIV
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