Bitumen emulsion containing polyaluminum compounds

Patent metadata

Field	Value
Publication number	US-9422453-B2
Application number	US-201314437545-A
Country	US
Kind code	B2
Filing date	Nov 26, 2013
Priority date	Nov 28, 2012
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

The invention relates to an additive for a bitumen emulsion, which is a specific mixture of alkoxyiated compounds with low and high amounts of alkylene oxide units, in combination with a polyaluminum compound. Using this additive it is possible to prepare an aqueous slow-setting bitumen emulsion-aggregate mix suitable for cold paving of roads, parking places, sidewalks, and the like.

First claim

The invention claimed is:

1. An additive for a bitumen emulsion comprising
i) a polyaluminum compound;
ii) an alkoxylated amine having the formula:

where R is a hydrocarbyl group having from 10 to 24 carbon atoms; n=0-3; each AO is independently ethyleneoxy or propyleneoxy, Y is a hydrocarbyl group having 1-24 carbon atoms, or a group (AO) x H; and the sum of all x in (I) is 0.5-10; and
iii) an alkoxylated compound having the formula:

where R′ is a hydrocarbyl group from 8 to 24 carbon atoms; X is N, C(═O)O or O; s=0-3; p=0 or 1; provided that when X is N, then p is 1 and when X is C(═O)O or O, then p is 0; and Z is a hydrocarbyl group having 1-24 carbon atoms, or a group

where each AO independently is ethyleneoxy or propyleneoxy, and the sum of all y in (II) is from 12 to 200; or castor oil that has been alkoxylated 12 to 200 moles of ethylene oxide and/or propylene oxide per mole of castor oil (III).

2. The additive according to claim 1 , wherein the sum of all x in formula (I) is from 0.5 to 5.

3. The additive according to claim 1 , wherein the sum of all y in formula (II) is from 14 to 100.

4. The additive according to claim 1 , wherein the AO in formula (I) is ethyleneoxy.

5. The additive according to claim 1 , wherein the AO in formula (I) is propyleneoxy.

6. The additive according to claim 1 , wherein at least 50% of the total number of AO-units in formula (II) or castor oil (III) is ethyleneoxy units.

7. The additive according to claim 1 , wherein the AO in formula (II) is ethyleneoxy.

8. The additive according to claim 1 , wherein the weight ratio of the alkoxylated amine to the alkoxylated compound is 1:25 to 4:1, and wherein the weight ratio of the polyaluminum compound to the sum of the alkoxylated amine and the alkoxylated compound is 1:30 to 1:2.

9. A bitumen-in-water emulsion comprising the additive according to claim 1 , bitumen and water.

10. The bitumen emulsion according to claim 9 , comprising
50-75% (w/w) bitumen;
0.002-1.5% (w/w) of the polyaluminum compound;
0.05-3% (w/w) of the total of the alkoxylated amine and the alkoxylated compound;
0-20% (w/w) of other conventional components; and with the balance being water.

11. The bitumen emulsion according to claim 9 , having a pH below 8.

12. The bitumen emulsion according to claim 9 , wherein X in formula (II) is N and p is 1.

13. The bitumen emulsion according to claim 9 , wherein Z is the group:

14. The bitumen emulsion according to claim 9 , wherein X in formula (II) is O, p is 0 and s is 0.

15. A process for the manufacture of an aqueous bitumen-aggregate mix comprising the steps of:
a) providing the bitumen emulsion according to claim 9 ; and
b) mixing said emulsion with an aggregate.

16. An aqueous bitumen-aggregate mix comprising 2-40% by weight of the bitumen emulsion according to claim 9 ; and
60-98% by weight of an aggregate.

17. A method for paving a surface of a road, a sidewalk, a parking lot or an airport runway comprising the step of:
spreading the bitumen-aggregate mix according to claim 16 on the surface, or
spreading the bitumen emulsion according to claim 9 on a surface at least partially covered by an aggregate.

18. The additive of claim 1 , wherein the polyaluminum compound is polyaluminum chloride.

19. The bitumen emulsion of claim 10 , wherein the polyaluminum compound is polyaluminum chloride.

Assignees

• Akzo Nobel Chemicals Int Bv

Inventors

• Hagberg Daniel
• Selse Dennis
• James Alan Duncan

Classifications

• C08L2555/28

  Asphalt produced between 0°C and below 65°C, e.g. cold mix asphalt produced between 0°C and 35°C · CPC title

• C08G65/2624

  containing aliphatic amine groups · CPC title

• C08K2003/164

  Aluminum halide, e.g. aluminium chloride · CPC title

• C08L2555/64

  Oils, fats or waxes based upon fatty acid esters, e.g. fish oil, olive oil, lard, cocoa butter, bees wax or carnauba wax · CPC title

• C08K3/22

  of metals · CPC title