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Polyetheylene moulding plastic suitable as a pipe material with excellent processing properties

A molding compound, ethylene technology, used in rigid pipes, tubes, thin material processing, etc., can solve problems such as low melt strength, uneven pipe wall thickness, and continuous instability in extrusion processing.

Inactive Publication Date: 2006-05-10
BASELL POLYOLEFINE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, lower melt strength often makes the extrusion process persistently unstable
Moreover, when this molding compound is processed and extruded into thick-walled pipes, it will cause sag problems
The problem is that a certain thickness accuracy cannot be achieved in industrial production, because the solidification time from the thermoplastic state to the tube takes up to several hours, during which time the wall thickness of the tube around the tube is not uniform due to the own weight of the melt

Method used

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  • Polyetheylene moulding plastic suitable as a pipe material with excellent processing properties
  • Polyetheylene moulding plastic suitable as a pipe material with excellent processing properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0034] The first bimodal ethylene polymer (A) is prepared according to the specifications of WO91 / 18934, adopting the Ziegler catalyst whose composition is a made in the operation step 2.2 in Example 2, the preparation operating conditions of the polymer (A) are listed in Table 1 below.

[0035] Reactor I

[0036] The melt flow index MFI of the prepared ethylene polymer (A) 5 / 190℃ A 0.49 dg / min, density d A It was 0.948 g / cc and the comonomer content was 1.5% by weight (based on the total weight of higher molecular weight components).

[0037] Then prepare the second bimodal ethylene polymer (B) according to the instructions of EP-B-0003129. For this purpose, under constant temperature conditions of 85 ° C, in the presence of the Ziegler catalyst described in EP-B Example 1, with stirring, at 6 6.7 kg of ethylene / h and 0.24 kg of 1-butene / h were introduced into the diesel with a boiling range of 130-170° C. placed in the reaction tank within 1 hour. After the r...

Embodiment 10-12

[0047] In order to determine the homogeneity of the mixture (no spots), the following three molding compounds were prepared:

Embodiment 1

[0048] Example 10 is the molding compound of Example 1, ie pure polymer (A).

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Abstract

The present invention relates to a polymer molding compound produced by a first ethylene polymer (A) and a second ethylene polymer (B). The molding compound is especially suitable for making thick-walled large-diameter pipes, wherein the molding compound contains 55-75 (weight) % of the first ethylene polymer (A) and the amount of 25-45 (weight) % of the second ethylene polymer (B) (based on the total weight of the molding compound), wherein the first ethylene polymer (A) It is a copolymer of ethylene and 1-olefin comonomers with a total carbon number of 4-10 in an amount of 0.2-5 (weight)% (based on the weight of the first ethylene polymer (A)), and the copolymer has a broad Bimodal molar mass distribution; wherein the second ethylene polymer (B) is a copolymer of ethylene and a 1-olefin having 4-10 carbon atoms, the copolymer being bimodal different from the first ethylene polymer (A) Molar mass distribution. The invention also relates to high-strength pipes produced from the molding compound and the use of the pipes in natural gas transmission or water transmission systems.

Description

technical field [0001] The present invention relates to polymer molding compounds produced from a first ethylene polymer (A) and a second ethylene polymer (B). The processing performance of the molding compound makes it especially suitable for the manufacture of thick-walled and large-diameter pipes. Background technique [0002] Polyethylene has been widely used in the manufacture of pipes, for example for gas conveying systems or water conveying systems, since such pipes require materials with high mechanical strength, high corrosion resistance and long-term durability. There is a great deal of literature describing such materials with a wide variety of properties and methods of making them. [0003] EP-A-603935 already describes molding compounds based on polyethylene with a bimodal molar mass distribution which are especially suitable for the manufacture of pipes. However, pipes made of the molding compound proposed in this document are poor in internal pressure long-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/04C08L23/08C08J3/20
CPCC08L23/0815C08L2205/02C08L2205/025Y10S138/07Y10T428/139C08L2666/04C08L23/08F16L9/12
Inventor P·克鲁姆派尔J·-F·恩德鲁
Owner BASELL POLYOLEFINE GMBH
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