Latent epoxy-amine composition for CIPP application

Patent metadata

Field	Value
Publication number	US-12378452-B2
Application number	US-202017634786-A
Country	US
Kind code	B2
Filing date	Aug 31, 2020
Priority date	Sep 2, 2019
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A two-component epoxy resin composition, made of: a resin component including: at least one epoxy resin that contains on average more than one epoxy group per molecule; up to 25 wt.-% of at least one epoxy-functional reactive diluent having one or two epoxy groups per molecule; and a hardener component including: between 40 and 80 wt.-% of at least one amino-functional hardener of formula (I),

wherein n is an integer with a value of 2 or 3, R 1 is a linear, cyclic or branched alkyl residue that optionally contains ether oxygen atoms and R 2 is a methyl or ethyl group; between 10 and 30 wt.-% of at least one Lewis base having at least one tertiary amino group, amidine group, or guanidine group; and between 10 and 30 wt.-% of at least one carboxylic acid.

First claim

The invention claimed is:

1. A two-component epoxy resin composition, consisting of:
a resin component K1 comprising:
between 75 and 95 wt.-%, based on component K1, of at least one epoxy resin A that contains on average more than one epoxy group per molecule;
between 5 and 25 wt.-%, based on component K1, of at least one epoxy-functional reactive diluent RD having one or two epoxy groups per molecule; and

a hardener component K2 comprising:
between 50 and 70 wt.-%, based on component K2, of at least one amino-functional hardener B of formula (I),

wherein n is an integer with a value of 2 or 3, R 1 is a linear, cyclic or branched alkyl residue that optionally contains ether oxygen atoms and R 2 is a methyl or ethyl group;
between 15 and 25 wt.-%, based on component K2, of at least one Lewis base LB that is selected from the group consisting of tris-2,4-6-dimethylaminomethyl phenol, 1,1,3,3-tetramethylguanidine, and 1,8-diazabicyclo [5.4.0] undec-7-ene; and
between 15 and 25 wt.-%, based on component K2, of at least one carboxylic acid AC,

wherein the at least one Lewis base LB and the at least one carboxylic acid AC are present together in the form of a Lewis salt, and
wherein a molar ratio of carboxylic acid groups of the at least one carboxylic acid AC to tertiary amino groups of the at least one Lewis base LB is between 0.6 and 0.95.

2. The two-component epoxy resin composition according to claim 1 , wherein the residue R 1 is an oligomer or polymer containing oxypropylene repeating units.

3. The two-component epoxy resin composition according to claim 1 , wherein the hardener B has an amine hydrogen equivalent weight of between 50 and 100 g/eq.

4. The two-component epoxy resin composition according to claim 1 , wherein carboxylic acid AC is a linear or branched C2 to C18 monocarboxylic acid.

5. The two-component epoxy resin composition according to claim 1 , wherein epoxy resin A comprises liquid bisphenol A digylcidyl ethers and optionally liquid bisphenol F diglycidyl ethers with a viscosity at 25° C., measured according to ASTM D-445, in the range of 8 to 12 Pa·s.

6. The two-component epoxy resin composition according to claim 1 , wherein reactive diluent RD comprises linear or branched C12 to C14 monoglycidyl ethers and/or linear or branched C2 to C6 diglycidyl ethers.

7. The two-component epoxy resin composition according to claim 1 , wherein the two-component epoxy resin composition contains the reactive diluent RD with an amount of between 10 and 20 wt.-%, based on resin component K1.

8. A process for relining a pipe, comprising the steps:
1) preparing a two-component epoxy resin composition according to claim 1 ;
2) mixing the two-component epoxy resin composition;
3) impregnating a relining felt material with the mixed epoxy resin composition;
4) applying the epoxy-resin impregnated relining felt material in a cured-in-place pipe rehabilitation (CIPP) process.

9. The process according to claim 8 , wherein the relining felt material is a polyester felt, a glass-fiber reinforced polyester felt, or a glass fiber felt.

10. The process according to claim 8 , wherein between step 3) and step 4) the impregnated felt material is stored up to at least one week at a storage temperature of between −15° C. and 25° C., before step 4) is applied.

11. The process according to claim 8 , wherein step 3) is not performed at the same place than step 4).

12. The process according to claim 8 , wherein the mixed epoxy resin material with which the felt material is impregnated is cured during the CIPP process by steam or hot water.

13. A felt material impregnated with a mixed two-component epoxy resin composition according to claim 1 .

14. A pipe, relined using the process according to claim 8 .

15. The two-component epoxy resin composition according to claim 1 , wherein the molar ratio of carboxylic acid groups of the carboxylic acid AC to tertiary amino groups of the Lewis Base LB in the composition is between 0.5 and 1.0.

16. The two-component epoxy resin composition according to claim 1 , wherein the molar ratio of carboxylic acid groups of the carboxylic acid AC to tertiary amino groups of the Lewis Base LB in the composition is between 0.6 and 0.95.

Assignees

• Sika Tech Ag

Inventors

• Rossignol Jean-Louis
• Zuretti Arnaud
• Chaignon-Lesetre Fleur
• Grohar Anthony

Classifications

• C09J2400/163

  in the substrate · CPC title

• C09J2203/346

  for building applications e.g. wrap foil · CPC title

• C09J7/255

  Polyesters · CPC title

• B05D3/0473

  for heating, e.g. vapour heating · CPC title

• B05D3/108

  Curing · CPC title