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Highly abrasion-resistant grafted polyolefin pipe

a polyolefin pipe, high abrasion resistance technology, applied in the direction of synthetic resin layered products, packaging, vehicular safety arrangments, etc., can solve the problems of high cost, high cost, and large volume of grafted polyolefin pipe, and achieve the effect of high abrasion resistance, high abrasion resistance and high abrasion resistan

Inactive Publication Date: 2010-05-06
PERFORMANCE MATERIALS NA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is about a new type of pipe or tube made from a special material called grafted polyolefin. This material is made by adding a small amount of a special acid or anhydride to a polyolefin material, which is then pulled or inserted into a metal or plastic pipe. The grafted polyolefin layer is very thin and helps to protect the pipe from corrosion and other damage. The invention also includes methods for making the grafted polyolefin-lined pipe and using it to transport abrasive materials."

Problems solved by technology

They are expensive, heavy and only provide a temporary solution since they are eventually destroyed.
However, because of the pipe weight, this rotation is difficult and ultimately the entire pipe is worn out and must be replaced.
Many of the commonly available materials cannot stand up to such highly-abrasive mining streams and are quickly worn out.
For example, high density poly(ethylene) pipes are generally used as liners for sanitary sewer and wastewater pipelines but they rapidly degrade under highly abrasive environments.
A shortcoming of grafted polyolefin pipes, pipe liners and coatings in the art is low abrasion resistance resulting in short service lifetimes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0105]The following Examples are intended to be illustrative of the invention, and are not intended in any way to limit its scope.

[0106]Melt Index (MI) was measured by ASTM D1238 at 190° C. using a 2160 g, unless indicated otherwise. A similar ISO test is ISO 1133. Shore A hardness was measured according to ASTM D2240, ISO 868.

Meterials Used

[0107]GPO1: high density polyethylene (density 0.960 g / cc) grafted with 0.9 wt % maleic anhydride, with MI of 2 g / 10 min and Shore A hardness of 98.[0108]GPO2: poly(ethylene-co-hexene) (density 0.918 g / cc) grafted with 1.8 wt % maleic anhydride, with MI of 2 g / 10 min and Shore A hardness of 96.[0109]GPO3: poly(ethylene-co-hexene) (density 0.918 g / cc) grafted with 0.95 wt % maleic anhydride, with MI of 2.7 g / 10 min and Shore A hardness of 95.[0110]GPO4: an EPDM (density of 0.882 g / cc) grafted with 0.5 wt % maleic anhydride with MI of 23 g / 10 min and Shore A hardness of 65.[0111]GPO5: poly(ethylene-co-butene) (density 0.873 g / cc) grafted with 0.9 w...

examples 8-16

[0130]The grafted polyolefin pipes summarized in Table 2 are made from the materials listed by conventional pipe extrusion and sizing methods with melt extrusion temperatures in the range from about 150° C. to about 225° C. The pipes are cut into 20 foot lengths. “OD”=outer diameter.

TABLE 2ExampleMaterialOD thicknessThickness 8GPO5200.5 9GPO6241.010GPO5282.011GPO2220.3812GPO3260.7513GPO6321.514GPO4260.415GPO5301.016GPO6341.8

examples 17-22

[0131]The grafted polyolefin bilayer pipes summarized in Table 3 are made from the materials listed by conventional multilayer pipe extrusion and sizing methods with melt extrusion temperatures of about 150° C. to about 225° C. The pipes are cut into 20 foot lengths.

TABLE 3Inner LayerOuter LayerExampleMaterialThicknessMaterialThicknessOD thickness17GPO50.5ACR0.252018GPO31.0EPDM0.42419GPO52.0HDPE 10.52820GPO60.38SEBS 20.22221GPO40.75SEBS 30.32622GPO61.5HDPE 20.532

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Abstract

A pipe or tube article comprising an innermost comprising a grafted polyolefin composition made from a grafted polyolefin composition is disclosed which can provide long lifetime, highly abrasion-resistant pipes for mining and other transportation uses. Methods for preparing the article and transporting abrasive materials through the article are also described.

Description

[0001]The invention relates to highly abrasion-resistant tubular articles comprising grafted polyolefin layers that provide for the transport of particulates and slurries, methods and compositions to produce the articles, and methods of transporting abrasive materials through them.BACKGROUND OF THE INVENTION[0002]Mining operations require the transport of highly abrasive particulate or slurry streams. The recovery of bitumen from oil sands is becoming increasingly important within the energy industry. Processing oil sand includes transporting and conditioning the oil sand as an aqueous slurry over kilometer lengths of pipe up to 1 meter in diameter. Processes for recovery of bitumen from oil sands are known (U.S. Pat. Nos. 4,255,433, 4,414,117, 4,512,956, 4,533,459, 5,039,227, 6,007,708, 6,096,192, 6,110,359, 6,277,269, 6,391,190, US2006 / 0016760, US2006 / 0249431, US2007 / 0023323, US2007 / 0025896, WO2006 / 060917, CA1251146, CA2195604, CA2227667, CA2420034, CA2445645, and CA2520943). Use ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B1/08
CPCC08F255/00C08F255/02C08L51/06C09D151/06C08L2666/02Y10T428/1362Y10T442/198Y10T442/172Y10T442/102Y10T137/0318Y10T442/184Y10T428/1372Y10T428/1393Y10T428/1366Y10T428/1352Y10T428/1314Y10T428/1386Y10T428/1355
Inventor HAYES, RICHARD ALLENLIN, QIN
Owner PERFORMANCE MATERIALS NA INC