Method for producing foam bitumen with improved foam...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 95/00 (2006.01) C08J 9/00 (2006.01) C08K 5/5419 (2006.01)

Patent

CA 2443833

The invention provides a process for producing foamed bitumen from bitumen, water, and additives, which comprises using as additive at least one silicone compound of the general formula (see above formula) in which R, R1 and R2 in the average molecule can be identical or different and denote an alkyl radical having 1 to 30, preferably 8 to 22 carbon atoms or the radical -Z-(C n H2n O-)m R3, where R3 is a hydrogen radical or an alkyl radical having 1 to 8 carbon atoms, Z is a divalent radical of the formula -O-, --(CH2)p-O- or -CH2-CH(CH3)-CH2-O- with p = 2 to 6, n is an average numerical value from 2.7 to 4.0, m is an average numerical value from 5 to 130, a and a' together have an average numerical value from 4 to 1500, b and b' together have an average numerical value from 0 to 100, and c and c' together have an average numerical value from 0 to 50.

L'objet de l'invention est un procédé de production de bitume moussé à partir de bitume, d'eau et d'additifs, caractérisé en ce que l'on utilise comme additif au moins un composé de silicone de formule générale (I), dans laquelle R, R<1> et R<2> peuvent être identiques ou différents dans la molécule moyenne et représenter un groupe alkyle comprenant de 1 à 30, de préférence de 8 à 22 atomes de carbone ou le groupe -Z- (CnH2nO-)mR3, R3 étant un atome d'hydrogène ou un groupe alkyle comprenant de 1 à 8 atomes de carbone, Z étant un groupe bivalent de formule -O-, -(CH2)p-O- ou -CH2-CH(CH3)-CH2-O-, avec p compris entre 2 et 6, n ayant une valeur numérique moyenne comprise entre 2,7 et 4,0, m ayant une valeur numérique moyenne comprise entre 5 et 130, a et a' ayant ensemble une valeur numérique moyenne comprise entre 4 et 1500, b et b' ayant ensemble une valeur numérique moyenne comprise entre 0 et 100 et c et c' ayant ensemble une valeur numérique moyenne comprise entre 0 et 50.

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