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Process for the production of impact resistant pipe

A technology for pipes and pipe walls, which is applied in the field of producing pipes containing polypropylene layers and reinforced impact-resistant pipes, which can solve the problems of low impact strength, failure to reach, and reduction

Active Publication Date: 2009-08-26
ボレアリステクノロジーオイ
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  • Abstract
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Problems solved by technology

[0009] Nevertheless, although in the prior art the β-phase content in polypropylene compositions is discussed and considered to be relevant for the final production part including pipes, the final pipe product may not actually reach this level β-phase content of
Although the polymer compositions used may contain high levels of beta-content, pipes produced from these compositions exhibit reduced or diminished levels of beta-modification and concomitantly lower impact strength

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  • Process for the production of impact resistant pipe
  • Process for the production of impact resistant pipe
  • Process for the production of impact resistant pipe

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[0102] 1. Definition and measurement method

[0103] The terms and assay methods used to measure properties, which are used to explain the present invention, apply generally to the description above and to the examples and claims below, unless otherwise stated:

[0104] a) WAXS analysis and β-crystallinity: The overall crystallinity and β-phase content in PP were determined by WAXS (Wide Angle X-ray Diffraction) scanning of 200 μm thick sample flakes prepared mechanically from the production pipe ( Compare, Moore, J., Polypropylene Handbook, p. 134-135, Hanser Publishers Munich 1996). WAXS maps were recorded with a Philips X'Pert Pro goniometer using Cu Ka rays at an accelerating voltage of 40 kV and in 0.02° steps over the 2Θ range of 10-30°. Measurements are made in reflected light with a divergence slit of 0.5° and a graphite monochromator. Amorphous rings detected on fully irregular polypropylene samples were subtracted from the overall diffractogram before calculating p...

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Abstract

The present invention relates to a process for producing a pipe comprising at least one layer made of a polypropylene composition comprising a beta nucleated polypropylene base resin, wherein the process comprises the steps of: a) extrusion of the polypropylene composition at a temperature of above 200 DEG C, b) subsequent cooling of the extruded product with a cooling medium having a temperature of above 5 DEG C, and c) subsequent annealing of the extruded product with an annealing medium having a temperature of at least the cooling medium temperature of step b), and to a pipe comprising at least one layer made of a propylene polymer composition, wherein the average beta-crystallinity of the pipe layer, beta av is higher or equal to 20 %.

Description

technical field [0001] The present invention relates to a method for producing pipes containing layers of polypropylene (PP) and reinforced pipes resistant to impact forces. Background technique [0002] Due to the good mechanical properties of polypropylene, it is used in various polymer articles. Examples of such items are pipes produced by melt extrusion or fittings produced by injection moulding. [0003] It is known that by selectively producing the β-modification in crystalline isotactic polypropylene, an increase in the impact strength of technical polymer objects can be obtained, which is particularly important for low-temperature applications. [0004] Chen et al. (Polymer 43 (2002) 6505-14) describe such an increase in impact strength. The PP-homopolymer and PP-impact copolymer in the β-phase showed better rigidity compared with the α-version. The crystallinity of the α- and β-modifications was assessed by wide-angle X-ray scattering (WAXS). [0005] Specific n...

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Application Information

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IPC IPC(8): C08K5/20C08K5/3435
CPCC08K5/0083C08L23/10B29D23/00B29C48/00
Inventor 马库斯·加尔艾特纳齐格弗里德·利德奥尔弗朗茨·鲁梅尔诺贝特·扬森赖因霍尔德·加德考诺·阿拉斯特勒
Owner ボレアリステクノロジーオイ
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