Reducing crumb rubber modified bitumen odors
A method for reducing odors including the steps of admixing active agents and a diluting agent to liquid crumb rubber modified bitumen, wherein the active agents comprise 20 to 60 wt.-% of an aldehyde selected from alpha-hexyl cinnamaldehyde, 2-(4-tert.-butylbenzyl) propionaldehyde, 2-benzylidenheptanal, or mixtures thereof, and 10 to 40 wt.-% of one or more alcohols having a boiling point of at least 150° C., calculated on the total weight of active agents. A crumb rubber modified bitumen composition as obtained by the method above. The use of a crumb rubber modified bitumen composition as obtained by the method above in road surfacing and road base materials, in insulating layers for buildings, in roofing materials and/or in sealing sheeting.
1. A method for reducing odors including the steps of admixing active agents and a diluting agent to liquid crumb rubber modified bitumen, wherein the active agents comprise:
A: 20 to 60 wt.-% of aldehyde(s) selected from:
A1. alpha-hexyl cinnamaldehyde,
A2. 2-(4-tert.-butylbenzyl) propionaldehyde,
A3. 2-benzylidenheptanal,
or mixtures thereof,
B: 0 to 20 wt.-% of one or more other aldehydes having at least 10 carbon atoms in the molecule,
C: 10 to 40 wt.-% of one or more alcohols having a boiling point of at least 150° C.,
D: 0 to 20 wt.-% of one or more terpenes having a boiling point of at least 150° C.,
E: 0 to 10 wt.-% of ketone(s) having a boiling point of at least 150° C.,
F: 0 to 10 wt.-% of carbonic acid ester(s), calculated on the total weight of active agents;
wherein 210 to 400 ppm of a mixture of 5 to 50 wt.-% active agents and 95 to 50 wt.-% of a diluting agent is admixed with a liquid crumb rubber modified bitumen composition.
2. The method according to claim 1 , wherein the diluting agent is a mineral oil.
3. The method according to claim 1 , wherein the liquid crumb rubber modified bitumen composition comprises:
(a) 20 to 96 wt % bitumen;
(b) 3 to 80 wt % of crumb rubber;
calculated on the total weight of the crumb rubber modified bitumen composition.
4. The method according to claim 1 , wherein the liquid crumb rubber modified bitumen composition comprises:
(a) 20 to 96 wt % bitumen;
(b) 3 to 80 wt % of crumb rubber;
(c) 0.1 to 10 wt % of a polymer comprising glycidyl functional groups; and
(d) 0.3 to 5 wt % of a wax;
calculated on the total weight of the crumb rubber modified bitumen composition.
5. The method of claim 1 , wherein component B is selected from:
B1. 3-(4-iso-propylphenyl) 2-methylpropanal,
B2. 2-methylundecanal,
B3. 2-methyl-3-(3 ,4-methylene-dioxyphenyl)-propanal,
or mixtures thereof.
6. The method of claim 1 , wherein component C is selected from:
C1. linalool,
C2. eugenol,
C3. geraniol,
C4. alpha-terpineol,
or mixtures thereof.
7. The method of claim 1 , wherein component D is selected from:
D1. limonene,
D2. alpha-pinene,
or mixtures thereof.
8. The method of claim 4 , wherein the polymer comprising glycidyl functional groups is a copolymer of ethylene and glycidyl acrylate or methacrylate, or a terpolymer of ethylene, alkyl acrylate or methacrylate and glycidyl acrylate or methacrylate.
9. The method of claim 4 , wherein the polymer comprising glycidyl functional groups is a grafted polymer comprising glycidyl acrylate or methacrylate grafted onto a polyethylene backbone.
10. The method of claim 4 , wherein the wax is a paraffin wax resulting from a Fischer-Tropsch process, or ethylene bis-stearamide.
11. A crumb rubber modified bitumen composition as obtained by claim 1 .
12. The method according to claim 1 , wherein the diluting agent comprises a hydrocarbon middle distillate.
13. The method according to claim 1 , wherein the diluting agent comprises a vegetable oil.