Cured-in place pipe rehabilitation process

Patent metadata

Field	Value
Publication number	US-9651189-B2
Application number	US-201214123412-A
Country	US
Kind code	B2
Filing date	Jun 22, 2012
Priority date	Jul 8, 2011
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

The invention relates to a process comprising: (a) preparing a curable epoxy-anhydride thermoset composition; and (b) applying said curable epoxy-anhydride thermoset composition in a cured-in-place pipe rehabilitation process is disclosed. The cured-in-place pipe application utilized can generally be the ‘Inversion Installation Method,’ or the ‘Pull-in Installation Method’. The invention also relates to a cured-in-place pipe that is prepared by this process.

First claim

What is claimed is:

1. A process comprising:
(a) preparing a curable epoxy-anhydride thermoset composition comprising:
(i) preparing a mixture comprising a diglycidyl ether of bisphenol A, 1,4-butanedioldiglycidyl ether (BDDGE), a reactive diluent, and a C 12 -C 14 alkylglycidyl ether;
(ii) dissolving benzyltriethylammonium chloride (BTEAc) in methyl tetra hydrophthalic anhydride (MTHPA); and
(iii) mixing components (i) and (ii) at room temperature; and

(b) applying the curable epoxy-anhydride thermoset composition in a cured-in-place pipe rehabilitation process;
wherein the concentration of the catalyst is 0.1 wt % to 7 wt %; and
wherein the curable epoxy-anhydride thermoset composition is cured at a temperature of from about 40° C. to about 130° C. for from about 30 minutes to about 12 hours.

2. The process of claim 1 , wherein the cured-in-place pipe application comprises an ‘Inversion Installation Method’.

3. The process of claim 1 , wherein the cured-in-place pipe application comprises a ‘Pull-in Installation Method’.

4. The process of claim 1 , wherein the curable epoxy-anhydride thermoset composition has a pot-life of greater than about 3 hours at room temperature (about 25° C.).

5. The process of claim 1 , wherein the curable epoxy-anhydride thermoset system composition has a pot-life in the range of from about 3 hours to about 36 hours at room temperature (about 25° C.).

6. The process of claim 1 , wherein a pipe in the cured-in-place pipe process has a diameter of from about 6 inches to about 100 inches.

7. The process of claim 1 , wherein the diglycidyl ether of bisphenol A has an EEW in the range of from about 130 to about 250.

8. The process of claim 1 , wherein the diglycidyl ether of bisphenol A has a viscosity in the range of from about 200 mPa·s to about 10,000 mPa·s.

9. The process of claim 1 , wherein the curable epoxy-anhydride thermoset composition further comprises an anhydride having a viscosity in the range of from about 50 mPa·s to about 1000 mPa·s.

10. The process of claim 1 , wherein the curable epoxy-anhydride thermoset composition further comprises a toughening agent.

11. The process of claim 1 , wherein the curable epoxy-anhydride thermoset composition further comprises a polyol.

12. The process of claim 1 , wherein the curable epoxy-anhydride thermoset composition further comprises a compound selected from the group consisting of fumed silica, talc, clay, silica, and combinations thereof.

13. The process of claim 1 , wherein the pipe in the cured-in-place pipe process is selected from the group consisting of a sewer pipe, potable water pipe, a high pressure pipe, and an industrial pipe.

Assignees

• Karunakaran Krishnan
• Turakhia Rajesh H
• Blue Cube Ip Llc

Inventors

• Karunakaran Krishnan
• Turakhia Rajesh H

Classifications

• B29C63/0017 Primary

  characterised by the choice of the material · CPC title

• E03F5/06

  Gully gratings · CPC title

• B29K2063/00

  Use of {EP, i.e.} epoxy resins {or derivatives thereof}, as moulding material · CPC title

• E03F5/025

  provided with a liner · CPC title

• F16L55/165 Primary

  a pipe {or flexible liner} being inserted in the damaged section · CPC title