Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
  • C09K23/017—Mixtures of compounds

Definitions

• the present invention relates to a hydrocarbon emulsion and its use for preventing adhesion of asphalt to rubber cylinders or wheels and to a process for preventing such adhesion.
• planing rollers are used for the packing and planing of the asphalt, which plaining rollers are provided with two or three cylinders (or wheels). These cylinders have earlier most often been made of steel without a surface coating, but during recent, time rubber-coated cylinders have been used as one or more of the wheels. The reason therefor is that a certain texture of the road surface may be achieved, which is of advantage from the traffic security point of view and also a lesser amount of noise from the machine.
• the use of rubber-coated cylinders has, however, the disadvantage that the asphalt has a tendency to adhere to the rubber, which it does not do to a pure steel surface. Attempts have been made to prevent that asphalt adheres by the application of hydrocarbons to the rubber surface, such as diesel oil. However, such oils contain aromatics and are volatile and thus unsuitable for health and environmental reasons.
• One purpose of the present invention is to provide a means which enables the use of planing rollers with rubber-coated cylinders (wheels) for the compression and planing of asphalt-surfaces of roads and similar.
• Another purpose of the invention relates to the use of a means for application onto rubber-coated cylinders and wheels of planing rollers in connection with the deposition of asphalt.
• the rubber-coated cylinder wheel in operation is coated with an aqueous emulsion of a hydrocarbon in which a mixture of two (or several) tensides (emulsifiers) , A and B, are used.
• the means according to the invention is an aqueous hydrocarbon emulsion which, as an emulsifier, contains a mixture of two or several tensides A and B.
• the tenside A is of a non-ionic character and is an adduct of a primary alcohol and ethylene oxide with 20-50 ethylene oxide units.
• R is a c ⁇ n ⁇ C 25 ⁇ Y ⁇ or alkylene group and R is hydrogen or methyl.
• the mechanism for the transfer of tenside B to the rubber surface can be somewhat different depending on the character of the emulsion.
• the tenside A is of a tenside with a relatively long ethylene oxide chain (20-50 EO units).
• the tenside B will form a "skin" around the dispersed hydrocarbon particles with its hydrophobic carbon chain oriented towards the interior of the hydrocarbon droplet, whereas the tenside A is oriented on the particle surface with the long hydrophilic ethylene oxide chain out towards the aqueous phase, the chains causing a certain degree of entanglement and thus bind the emulsified particles in a network.
• the emulsion is very stable and is storable during a long time.
• the hydrocarbon component of the emulsions according to the present invention is an organic substance which is liquid at room temperature and able to dissolve the tenside B, preferably a non-polar hydrocarbon, such as kerosene, naphta, paraffin oil or similar, preferably substances which are volatile at about 80-130°C.
• the hydrocarbon component is present in an amount of 0.2-40 percent by weight, suitably 1-40 percent by weight of the finished emulsion, preferably 5-20 percent by weight.
• the tenside A which is of a non-ionic character, is present in an amount of about 0.1-5 percent by weight, preferably 0.3-3 percent by weight.
• the tenside A is chosen, as mentioned above, among adducts of primary alcohols and ethylene oxide. These adducts shall contain 20-50 EO units, suitably 30-40 EO units.
• a suitable adduct is for instance a nonylphenol/- ethylene oxide adduct.
• the tenside B is a fatty acid/nitrogen adduct with the formula
• R 1 I R-CO-N-CH 2 COOH wherein R is a C;ig ⁇ C 25 alkyl or alkylene group and R is hydrogen or methyl.
• An especially suitable form is a compound wherein R-CO- is oleyl and R is CH,, i.e. oleyl-sarcosine.
• the tenside B is present in an amount of 0.1-20 percent by weight, preferably 0.5-5 percent by weight of the finished emulsion.
• Example 1 10 parts by weight of kerosene (low-aromatic, about 2% aromatics) 2.0 parts by weight of Tenside B (oleyl sarcosin) 1.7 parts by weight, of Tenside A 26.3 parts by weight of water 100
• the stability of the emulsion was assessed after 24 hours and 1 month.
• bitumen-rejecting effect was tested in a so called concrete laboratory in the following manner-.
• the cylinder was continuously wet with the emulsion. After 20 passages over the three meter long asphalt coating the cylinder was weighed so as to determine picking-up, if any.
• the cylinder which was continuously wet with the emulsion was compared with a cylinder wet with diesel oil.
• Diesel oil is regarded to function perfectly for this pupose but must not be used for environmental and health reasons. It was established that the emulsion according to the invention functioned as well as diesel oil with continuous wetting.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Colloid Chemistry (AREA)
• Liquid Carbonaceous Fuels (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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• 1987
  • 1987-04-02 SE SE8701391A patent/SE8701391D0/xx unknown
• 1988
  • 1988-03-31 BR BR888807463A patent/BR8807463A/pt unknown
  • 1988-03-31 EP EP88903439A patent/EP0382719A1/en not_active Withdrawn
  • 1988-03-31 WO PCT/SE1988/000165 patent/WO1988007408A1/en not_active Application Discontinuation
• 1989
  • 1989-09-21 FI FI894474A patent/FI894474A0/fi not_active IP Right Cessation
  • 1989-09-29 DK DK479989A patent/DK479989D0/da not_active Application Discontinuation

Non-Patent Citations (1)

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