FLUXING AGENTS FOR HOT SURFACE DRESSINGS

Abstract

The invention relates to the use, as fluxing agent for the production of a hot surface dressing, of an additive for hydrocarbon binder including at least one compound having the formula CH.sub.3—X—R—Y—R.sup.2 where: R.sup.2 is a C.sub.1-C.sub.11 chain of alkyl type, advantageously methyl; —X— and —Y— are each an ester or amide group with R′═H or C.sub.1-C.sub.4 alkyl; and —R— is a C.sub.1-C.sub.10 divalent hydrocarbon chain, optionally interrupted by one or more oxygen atoms; and where the STV pseudo-viscosity measured for said hydrocarbon binder to which has been added 10% by weight of said additive is below 500 seconds.

Claims

1. A method for the production of a hot surface dressing comprising: spreading out solid particles on a hydrocarbon binder, wherein the hydrocarbon binder comprises an additive for hydrocarbon binder including at least one compound having the formula (I) below:
CH.sub.3—X—R—Y—R.sup.2  (I) in which: R.sup.2 is a C.sub.1-C.sub.11, preferably C.sub.1-C.sub.9, hydrocarbon chain, linear or branched; each of —X— and —Y—, identical or different, is a —O—(C═O)— group; or a —(C═O)—O— group; or a —NR′—(C═O)— group; or a —(C═O)—NR′— group with R′ representing a hydrogen atom or instead a C.sub.1-C.sub.4 alkyl radical; and the —R— group is a C.sub.1-C.sub.10 divalent hydrocarbon chain, linear or branched, optionally interrupted by one or more oxygen atoms; wherein the STV pseudo-viscosity measured for said hydrocarbon binder to which has been added 10% by weight of said additive is below 500 seconds.

2. The method according to claim 1, wherein the STV pseudo-viscosity measured for said hydrocarbon binder to which has been added 10% by weight of said additive is below 450 seconds.

3. The method according to claim 2, wherein the STV pseudo-viscosity measured for said hydrocarbon binder to which has been added 10% by weight of said additive is below 400 seconds, preferably below 350 seconds.

4. The method according to claim 1, where the total concentration of compounds of formula (I) added to the hydrocarbon binder is comprised between 1 and 8%.

5. The method according to claim 1, where the compound of formula (I) is a compound having the following formula (Ia):
CH.sub.3—X—R—Y—CH.sub.3  (Ia) where the —X—, —Y—, and —R— groups are such as defined in claim 1.

6. The method according to claim 5, where the compound of formula (I) is selected from dimethyl adipate, dimethyl glutarate, dimethyl succinate, and mixtures thereof.

7. The method according to claim 5, where, in the compound of formula (Ia), R is selected from: the R.sub.MG group of formula —CH(CH.sub.3)—CH.sub.2—CH.sub.2—, the R.sub.ES group of formula —CH(C.sub.2H.sub.5)—CH.sub.2—, and mixtures thereof.

Description

EXAMPLES

[0124] The Vialit test was carried out at 5° C. (+/−1° C.) such as defined in the aforesaid NF EN 12272-3 Standard, using: [0125] a bitumen (grade 70/100−Supplier: Total)
Into which has further been introduced one or the other of the following additives, used at different contents according to the test:  INNROAD® BOOST (Solvay); or  RHODIASOLV® IRIS (Solvay) [0126] two types of aggregates, according to the test carried out, namely: [0127] Diorite (La Meilleraie); or [0128] Quartzite (Chailloué)

[0129] According to the test carried out, the 100 chippings tested are used as such, or instead washed and sieved beforehand to remove fines therefrom.

[0130] The results obtained are reported in the Table below where the content of additive is given in percentage by weight compared to the weight of bitumen without additive. A number c of bound particles which remains above 50 in this test at 5° C. is systematically observed.

[0131] As a comparison, the same tests were carried out with dimethyl malonate. Although it is a compound of formula (I), it proves to be clearly inefficient (the value of c is virtually zero even on increasing the content up to 7.5%).

TABLE-US-00001 TABLE Vialit test at 5° C. Distribution of Aggregates chippings at the Additive Washed end of the test Nature Content Nature and sieved a b c INNROAD ®   5% Diorite no 0 28 72 BOOST yes 0 24 76 Quartzite no 0 31 69 yes 1 24 75 RHODIASOLV   5% Diorite yes 1 30 69 IRIS 6.1% no 0 40 60 6.1% yes 0 20 80 Dimethyl 7.5% Diorite yes 0 99 1 malonate

[0132] Furthermore, the additive INNROAD® BOOST was subjected to the Vialit test at a temperature of 10° C., where it leads to improved results compared to those obtained in the above conditions at 5° C. This improvement may be taken advantage of to maintain substantially the properties by reducing the additive content.

[0133] INNROAD® BOOST was for example tested at a content of 4.5% in a bitumen 7/100 by using chippings of diorite and the following Vialit distribution was obtained: [0134] a=1; b=21; c=78
Which shows that with an additive content of 4.5%, results of the same order are obtained as at 5° C. with 5% (presented in the table above):