High-strength hydraulic-pressure-resistant polyethylene pipe and preparation method thereof

A polyethylene pipe, hydrostatic technology, applied in the direction of tubular objects, other household appliances, applications, etc., can solve the performance can not fully meet the actual use requirements of polyethylene pipes, the uneven cooling rate of the inner and outer walls of the pipe, the axial strength of the polymer pipe Advanced problems, to achieve the effect of easy to master control, improve hoop strength and hydrostatic resistance performance, high quality competitive advantage

Active Publication Date: 2019-03-22
SICHUAN UNIV
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are some inherent defects in polyethylene pipes produced by traditional extrusion methods: after the melt flows through the shunt shuttle, weld marks will be formed on the formed pipe, and these weld marks will become weak points under high fluid pressure, causing the pipe to undergo circumferential damage; Due to the structure of the conventional melt extrusion device, the extrusion direction and stretching direction of the material are both along the axial direction, and the molecular chains in the pipe are also

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-strength hydraulic-pressure-resistant polyethylene pipe and preparation method thereof
  • High-strength hydraulic-pressure-resistant polyethylene pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First put 99.9 parts by weight of conventional polyethylene PE80 material (brand: HE3440, manufacturer: Borealis Chemicals) and 0.1 part by weight of micro-crosslinked polyethylene with a gel content of 1% into a high-mixer for 5 minutes, then place in the polymer In the tube rotary extrusion device, the mandrel and the die are rotated in reverse at the same time, at a speed of 1 rpm, the temperature of the melting section is 170°C, and the temperature of the die section is 180°C. Under the traction of the machine, the PE80 pipe with a pipe diameter of ￠110 is obtained by cooling and sizing.

[0044] The hoop strength of the obtained pipe under hydrostatic pressure at 20°C is 10.8MPa, and the hoop strength under hydrostatic pressure at 80°C is 5.52MPa, both of which are 120% of the standard failure pressure of PE80 pipe at this temperature; the corresponding failure times are respectively 105 hours and 170 hours, which are 105% and 103% of the standard failure time of P...

Embodiment 2

[0046] In this example, except that the conventional polyethylene is 93.0 parts by weight, the slightly cross-linked polyethylene is 7.0 parts by weight, the gel content is 30%, the rotating speed is 20 rpm, the temperature of the melting section is 270°C, and the temperature of the die section is 250°C. It is exactly the same as Example 1, so it is omitted.

[0047] The hoop strength of the obtained pipe under hydrostatic pressure at 20°C is 10.8MPa, and the hoop strength under hydrostatic pressure at 80°C is 5.52MPa, both of which are 120% of the standard failure pressure of PE80 pipes at corresponding temperatures; the corresponding failure times are respectively It is 107 hours and 168 hours, which are 107% and 102% of the standard destruction time of PE80 pipe at the corresponding temperature.

Embodiment 3

[0049] In this example, except that the conventional polyethylene is 95 parts by weight, the slightly cross-linked polyethylene is 5 parts by weight, the gel content is 4%, the rotating speed is 15 rpm, the temperature of the melting section is 205°C, and the temperature of the die section is 225°C, because the other It is exactly the same as Example 1, so it is omitted.

[0050] The hoop strength of the obtained pipe under hydrostatic pressure at 20°C is 11MPa, and the hoop strength under hydrostatic pressure at 80°C is 5.6MPa, both of which are 122% of the standard failure pressure of PE80 pipe at the corresponding temperature; the corresponding failure times are 118 hours and 194 hours are both 118% of the standard failure time of PE80 pipes at corresponding temperatures.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Hoop strengthaaaaaaaaaa
Hoop strengthaaaaaaaaaa
Hoop strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a high-strength hydraulic-pressure-resistant polyethylene pipe. Conventional polyethylene and micro-crosslinked polyethylene are mixed and then molten and extruded under the rotation of a mandrel or/and a mouth model in a polymer tube rotary extrusion device; a prepared extruded pipe is 10.8 to 16.12MPa in annular strength under the condition of 20 DEG C static hydraulic pressure, and is 5.52 to 7.15MPa in annular strength under the test condition of 80 DEG C static hydraulic pressure; the time to failure at 100 to 200 percent of the standard time to failure is 100 to 200 hours, and the time to failure at 120 percent and 130 percent of standard pressure is 100 to 400 hours. The small amount of micro-crosslinked polyethylene is added in the conventional polyethylene,and thus the relaxation time of a polyethylene molecular chain in a molten state is prolonged greatly, so that an orientation structure in the polyethylene pipe prepared by rotary extrusion is effectively cooled and molded before relaxation, and more deviated axially-arranged shish-kebab with larger deviation angles are formed, thereby greatly improving the annular strength and static hydraulic pressure resistance of the polyethylene pipe.

Description

technical field [0001] The invention belongs to the technical field of polyethylene pipes and their preparation, and in particular relates to a high-strength hydrostatic-resistant polyethylene pipe and a preparation method thereof. Background technique [0002] Polymer pipes, especially polyethylene pipes, have excellent comprehensive properties, such as low density, low flow resistance, corrosion resistance, easy installation, easy connection, etc., and are widely used in the fields of gas transmission, water transmission, and agricultural irrigation. At present, my country's polymer pipe processing has become one of the country's important pillar industries. In 2015, my country's polymer pipe production exceeded 13 million tons, becoming the country with the largest polymer pipe production in the world. 9% growth rate is growing. [0003] There are some inherent defects in polyethylene pipes produced by traditional extrusion methods: after the melt flows through the shunt ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08L23/06C08L23/26B29L23/00B29K23/00
CPCB29K2023/06B29L2023/22C08L23/06C08L2023/44C08L2203/18C08L23/26
Inventor 聂敏王琪皮林白时兵
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap