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Polyolefin pipe with high strength and high oxygen barrier properties and preparation method thereof

A polyolefin, high-resistance technology, applied in the field of polyolefin pipes and its preparation, to achieve the effects of improving economic benefits, easy to obtain sources, and good continuity

Active Publication Date: 2014-04-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing plastic pipes, firstly to improve a preparation method of polyolefin pipes with high strength and high oxygen barrier performance

Method used

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  • Polyolefin pipe with high strength and high oxygen barrier properties and preparation method thereof
  • Polyolefin pipe with high strength and high oxygen barrier properties and preparation method thereof
  • Polyolefin pipe with high strength and high oxygen barrier properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Blend 100 parts of HDPE and 1 part of PET resin evenly, then put them into a twin-screw extruder to melt, and extrude through a rotating extruder head and a "melt shrinkage traction-cooling and sizing" device. The temperature of the melting section of the screw is The temperature of the die is 260°C, the temperature of the die is 250°C, the extrusion uses the mandrel to rotate relative to the die, the mandrel rotation speed is 6rpm, and in the stretching process, the diameter of the die is 40mm, the diameter of the sizing sleeve is 32mm, the screw The rotation speed is 60rpm, and the traction speed is 0.3m / min.

[0034] The hoop tensile strength of the obtained pipe is 38.3MPa, and the oxygen transmission rate is 48.6mm 3 / m 2 *24h*0.1MPa. Compared with the traditional extruded HDPE pipe, its hoop tensile strength increased by 7.9%, and its oxygen transmission rate decreased by 7%.

Embodiment 2

[0036] Blend 100 parts of PB-1 and 10 parts of PET resin evenly, then melt them in a twin-screw extruder, extrude through a rotating extruder head and a "melt shrinkage traction-cooling and sizing" device, and the screw melts The temperature of the section is 260°C, the temperature of the die is 260°C, the extrusion uses the mandrel to rotate relative to the die, the mandrel rotation speed is 6rpm, and in the stretching process, the diameter of the die is 40mm, and the diameter of the sizing sleeve is 20mm , the screw speed is 30rpm, and the traction speed is 0.2m / min.

[0037]The hoop tensile strength of the obtained pipe is 36.9MPa, and the oxygen transmission rate is 12.3mm 3 / m 2 *24h*0.1MPa. Compared with the traditional extruded PB-1 pipe, its hoop tensile strength increased by 15%, and its oxygen transmission rate decreased by 22%.

Embodiment 3

[0039] Blend 100 parts of PPR and 20 parts of PET resin evenly, then put them into a twin-screw extruder to melt, and extrude through a rotating extruder head and a "melt shrinkage traction-cooling and sizing" device. The temperature of the melting section of the screw is The temperature of the die is 280°C, the temperature of the die is 280°C, the extrusion adopts the rotation of the mandrel relative to the die, and the rotation speed of the mandrel is 6rpm, and in the stretching process, the diameter of the die is 40mm, the diameter of the sizing sleeve is 16mm, and the screw The rotation speed is 20rpm, and the traction speed is 0.3m / min.

[0040] The hoop tensile strength of the obtained pipe is 40.5MPa, and the oxygen transmission rate is 13.4mm 3 / m 2 *24h*0.1MPa. Compared with traditional extruded PPR pipes, its hoop tensile strength has increased by 32%, and its oxygen transmission rate has decreased by 28%.

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Abstract

The invention discloses a preparation method of a polyolefin pipe with high strength and high oxygen barrier properties. The preparation method comprises the steps of uniformly blending 100 parts of a polyolefin basal body and 1 to 60 parts of fiber-forming-phase resin, placing the mixture into a double-screw extruder, and extruding the mixture in a rotating extrusion mode at the temperature of a melting section of 180 to 280 DEG C and the temperature of an extrusion die of 170 to 280 DEG C, wherein the ratio of the diameter of the extrusion die to the diameter of a sizing sleeve is 1.25 to 4, and the ratio of the extrusion speed to the traction speed is 20 to 200 rpm:0.2 to 6.5 m / min in the stretching molding process. The annular tensile strength of the prepared pipe is improved by 7.0 to 69 percent compared with that of a traditional extruded pipe, and the oxygen permeability of the prepared pipe is reduced by 7 to 47 percent compared with that of the traditional extruded pipe. Since a melt convergence traction-cooling sizing way is adopted on the basis of the prior art, a fiber forming phase can be deformed, converged and formed in situ to form the fiber inside the pipe, the microfiber with the corresponding length-diameter ratio and content can be obtained, so that the annular tensile strength and the oxygen barrier property of the pipe can be simultaneously greatly improved.

Description

technical field [0001] The invention belongs to the technical field of polyolefin pipes and their preparation, and in particular relates to a polyolefin pipe with high strength and high resistance to oxygen and a preparation method thereof. Background technique [0002] Polyolefin (PO) pipes have developed rapidly due to their excellent properties such as low density, chemical corrosion resistance, low thermal conductivity, hygiene and safety, hot-melt connection and easy construction, and are widely used in various fluid transportation fields. Taking polyethylene (PE) as an example, the consumption of PE pipes in my country exceeded 3 million tons in 2012. Even so, there are still two defects in the polyolefin pipe prepared by the existing extrusion process: 1) The hoop strength is low, and the axial strength exceeds the hoop strength, and theoretical analysis proves that the hoop force of the pipe is axial force more than twice the force. 2) The weak oxygen barrier abili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/02B29C47/92C08L23/00C08L23/06C08L23/14C08L53/00C08L23/20C08L25/06C08L77/02C08L77/06C08L67/02B29C48/625B29C48/09B29C48/40B29C48/92
CPCB29C48/92B29C48/022B29C48/15B29C48/0018C08L23/06C08L23/14C08L53/00B29C2948/9259B29C2948/92704C08L2203/18C08L2201/14C08L2207/062C08L67/02C08L77/02C08L25/06B29B7/46B29B7/72B29B7/90B29C48/09B29C48/625B29C2948/9258B29C2948/926B29C2948/92761B29C2948/92885B29C2948/92895B29C2948/92904B29C2948/92933B29C48/40
Inventor 聂敏刘慰白时兵王琪
Owner SICHUAN UNIV
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