Multiplayer composite tube made from polymer possessing texture in nano layer and making method

A composite pipe material and processing method technology, applied in the direction of pipes, rigid pipes, household appliances, etc., can solve the problems of large amorphous region defects, low circumferential ductility, pipe damage, etc., achieve high interlayer bonding strength, improve Effects of improved physical and mechanical strength, barrier properties and corrosion resistance

Inactive Publication Date: 2005-10-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the axial stretching ratio of this drafting technology is much greater than the hoop stretching ratio, the internal structure of the pipe is dominated by the axial orientation of the molecular chain, and there are a large number of defects in the amorphous region, the hoop ductility is low, and the amorphous Part of it becomes the damage source of the pipe under the action of environment, medium and stress

Method used

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  • Multiplayer composite tube made from polymer possessing texture in nano layer and making method
  • Multiplayer composite tube made from polymer possessing texture in nano layer and making method
  • Multiplayer composite tube made from polymer possessing texture in nano layer and making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Polymer material: The polymer combination is high-density polyethylene / isotactic polypropylene (HDPE / iPP);

[0025] 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;

[0026]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

[0035] 1. Selection of polymer materials: The polymer combination is isotactic polypropylene and polyamide 6 (iPP / PA6);

[0036] 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 melted and plasticized by the extruder enters two melt pumps respectively. The temperature of the melt pump of iPP is 220°C, and the temperature of the melt pump of PA6 is 260°C. The two melts are pumped by their respective melts. Into the microlayer co-extrusion process.

[0037] 3. Micro-layer co-extrusion: The melt of iPP / PA6 is respectively input into a 4-channel 4-layer design with a three-layer co-extrusion mold by two extruders and a melt pump at a flow rate ratio of 10:90. In the micro-layer co-extrusion head composed o...

Embodiment 3

[0046] 1. Polymer material: The polymer combination is linear low density polyethylene / isotactic polypropylene (LLDPE / iPP);

[0047] 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;

[0048] 3. Micro-layer co-extrusion: The melt of LLDPE / iPP is synchronously fed into a design with three-layer co-extrusion mold and 4-channel 5-level multiplier by two extruders with a flow rate ratio of 20:80. 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 of ...

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Abstract

The invention discloses the multi-layer polymer composite tubing with nanometer layer structure and its manufacturing method. The composite tubing is formed by the two polymers with non-parallel hetero crossed structure, which passes through the micro-layer coextrusion, the cooled forming, the heat processing and the heat pulling procedures. The c axis of the base polymer layer is along the axial of the tubing, and it accumulative layer thickness is 50-99%of the thickness of the tubing; the c axis of the agglomerative polymer crosses with the axis line of the tubing, and its accumulative thickness is 1-50% of that of the tubing, and the thickness of the single layer of the agglomerative polymer is 50-300 nanometers. The invention forms the reinforcing phase in the tubing in order to strengthen the intensity of the tubing and to improve the expansion of the tubing.

Description

[0001] 1. The field of surgery. [0002] The invention belongs to the technical field of polymer material processing, and more specifically relates to a polymer composite pipe for bearing internal pressure and a processing method thereof. 2. Background technology [0003] Polymer pressure pipes have many advantages such as corrosion resistance, low flow resistance, high specific rigidity / strength, easy processing, light weight, easy construction and installation, etc., and are widely used in production and living fields such as chemical fluid transportation, civil water transportation, and gas transportation. When the pressure pipe bears the internal expansion pressure of the fluid, its hoop stress is twice the axial stress. However, for polymer pipes usually extruded, due to the macromolecular orientation along the axial direction and the effect of weld marks, the hoop strength of the pipe is much lower than the axial strength, which makes ordinary plastic pipes prone to hoop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/12
Inventor 陈利民李泽琼
Owner SICHUAN UNIV
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