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Method and composition suitable for coating drinking water pipelines

A composition and pipeline technology, used in coatings, pipe elements, polyurea/polyurethane coatings, etc., can solve the problem of inability to deal with multiple bending of pipes

Inactive Publication Date: 2012-04-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of these methods, as described in US Patent No. 7,189,429, are their inability to deal with multiple bends in the piping and the fact that side connecting pipes to user premises have to be disconnected and subsequently relocated after the retrofit process has been carried out

Method used

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  • Method and composition suitable for coating drinking water pipelines
  • Method and composition suitable for coating drinking water pipelines
  • Method and composition suitable for coating drinking water pipelines

Examples

Experimental program
Comparison scheme
Effect test

example

[0054] The following table describes the chemical descriptions, trade names, and suppliers of the components of the components used in the example coating compositions.

[0055]

[0056] testing method :

[0057] Tensile Strength and Elongation at Break - BS EN ISO 527:1996 (unless otherwise specified)

[0058] Flexural Strength - BS EN ISO 178:1997 (unless otherwise specified)

[0059] Film Set Time - The first and second parts were combined and mixed for 30-40 seconds before pouring into a dish at a depth of 3mm. Allow the composition to cure in a horizontal position. While curing, a wooden spatula can be tapped lightly on the surface. The time at which the blade stops sticking to the surface is the set time.

[0060] Tensile Strength and Elongation at Break - ASTM D638-08 Tensile Properties of Plastics

[0061] Equipment: Instron with fixed clamping force, 5kN load cell; Type I, Class C extensometer to determine Poisson's ratio

[0062] Software: Bluehill - reports...

example 2

[0105] Cast Iron Pipe Test of Example 2

[0106] The composition of Example 2 was applied to the interior of a 6 inch cast iron pipe using a two part pumping system, a static mixer and a centrifugal applicator head. The resulting liner had a nominal coating thickness of 3 mm. The cast iron tube was then machined to reduce the wall thickness in the area of ​​the compressed advancing probe, 3 point bend test with a 900mm span, to reduce the load required to break the tube and to control the fracture location. The compression rate of the bend tester was controlled at a rate of 0.5 mm / min until tube fracture was observed. Once the tube breaks, the rate is increased to 3 mm / min, and displacements are performed to designated endpoints corresponding to 5 and 10 degrees tube deflection angles, respectively. Then take a look at the inner lining. It should be noted that the liner did debond from the pipe wall in the area of ​​the fractured pipe, but remained bonded in all other are...

example 4

[0107] Example 4 - Exemplary Formulations for Smaller Diameter Tubes

[0108] product name

Part weight % solids

first part

Desmodur N3400

56.0

DER331

14.0

Tiona 595

2.2

Sylosiv A3

3.5

Microdol H600

22.5

Cab-o-Sil TS 720

1.8

the second part

Desmophen NH 1220

34.0

Desmophen NH 1420

34.0

Lonzacure m-DIPA

17.0

Microdol H600

7.1

Sylosiv

4.3

Bayferrox 318M

0.2

Cab-o-Sil TS 720

3.4

[0109]

[0110]

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PUM

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Abstract

The invention discloses methods of forming a coating on (e.g. internal) surfaces of a (e.g. drinking water) pipeline with two-part coating compositions comprising a first part comprising at least one polyisocyanate and a second part comprising at least one aspartic acid ester. Also described is a reactive two-part coating composition comprises a first part comprising at least one polyisocyanate; and a second part comprising at least one aspartic acid ester and at least one aromatic amine that is a solid at 25 DEG C.

Description

Background technique [0001] Trenchless methods for structural modification of potable water pipelines include the pipe-in-pipe method, burst pipe method, and polyethylene thin-wall liner method. Drawbacks of these methods, as described in US Patent No. 7,189,429, are their inability to deal with multiple bends in the piping and the fact that the side connecting pipes to the user's premises have to be disconnected and then relocated after carrying out the retrofitting process. [0002] U.S. Patent No. 7,189,429 describes a method of forming a coating on the interior surface of a drinking water pipe, the method comprising the steps of: a) providing a two-part paint system in liquid form; b) mixing the first part and the second part in together to form a mixture, and c) applying the mixture as a coating to the surface to form an integral liner exhibiting high strength and flexibility at a high cure rate. The two parts of the system are preferably applied by heated airless spray ...

Claims

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Application Information

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IPC IPC(8): C08G18/32C08G18/38C08G18/79C09D175/12F16L58/10
CPCC08G18/3243C08G18/798C09D175/12C08G18/3821F16L55/1645C08G18/10C08G2390/40C08G18/0885C08G18/792F16L55/164C08G18/3234
Inventor 伊恩·鲁滨逊斯图尔特·E·福雷斯迈克尔·J·科哈诺维奇
Owner 3M INNOVATIVE PROPERTIES CO
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