Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
  • C08K5/098—Metal salts of carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/20—Carboxylic acid amides
• • 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
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
• • 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
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
  • C09K3/185—Thawing materials

Definitions

• the present invention relates to a technology for the preparation of bituminous conglomerate road pavings which are self de-icing, namely are such that they do not allow or such that they delay over time the formation of ice adhering to the said paving; this technology therefore makes it possible to eliminate or limit greatly the loss of safety due to the reduction in road-holding and braking properties on the road surface in winter conditions and prevent deterioration of the road structure and pollution of the water and land adjacent to the road bed.
• the invention concerns a road paving composition, essentially consisting of at least one organic salt of alkaline and/or alkaline earth metals having a molecular weight less than 200 Da and at least one surfactant, achieving the abovementioned action by means of permanent incorporation inside various types of (closed or draining) pavings during different stages of their life (surfaces which are new, recycled or pre-existing on-site) or application onto the surface of the said paving.
• a road paving composition essentially consisting of at least one organic salt of alkaline and/or alkaline earth metals having a molecular weight less than 200 Da and at least one surfactant, achieving the abovementioned action by means of permanent incorporation inside various types of (closed or draining) pavings during different stages of their life (surfaces which are new, recycled or pre-existing on-site) or application onto the surface of the said paving.
• Another system is that of providing fixed installations in areas which are most exposed to these conditions so as to allow the automatic spraying of anti-ice liquid salts (generally calcium chloride in an aqueous solution) when required by the local weather conditions; these systems are also costly and localised and in any case give rise to problems of chloride pollution and attack.
• anti-ice liquid salts generally calcium chloride in an aqueous solution
• bituminous conglomerates i.e. those with a percentage of empty spaces tending towards zero
• bituminous conglomerates anti-ice chlorides which, however:
• the object of the present invention is to provide road surfaces, especially in the case of draining and noise-damping porous pavings, which in adverse weather conditions (as in winter) ensure conditions of maximum safety by preventing entirely the formation of ice due to atmospheric humidity or verglas and/or the snow from settling in the event of moderate snow falls and which, in the event of heavy or prolonged snow falls, make it possible to intervene with an ease and efficiency greater than in the case of normal closed pavings, using conventional salt spreaders and snow ploughs, while achieving a very marked reduction in the amount of aggressive salt used during the periods when ice alone is present and an increase in the probability of continuous management in safe conditions during snow falls, again with a reduction in the amount of salt used, even though less marked than in the case where ice alone is present.
• the road paving composition which forms the object of the present invention is essentially composed of at least one organic salt of alkaline and/or alkaline earth metals having a molecular weight less than 200 Da, preferably chosen from among sodium and/or calcium acetate and formate, and at least one surfactant.
• the preferred surfactant is a polyamine alkylamide, in particular a polyamine alkylamide with the formula:
• n is a prime number between 6 and 10, preferably 8, and m is a prime number between 1 and 6, preferably 4.
• the organic salt is present in an amount ranging between 90 and 99.8% and said surfactant is present in an amount ranging between 0.2 and 10%, relative to the total weight of the composition.
• composition may also contain:
• At least one alkylene glycol preferably chosen from among ethylene and/or propylene glycol, in an amount ranging between 0 and 2%, relative to the total weight of the composition; • at least one siloxane in an amount ranging between 2 and 5%, relative to the total weight of the composition.
• the composition of the invention may be used as an additive which is incorporated in bituminous conglomerates, especially of the draining type (with an open bituminous composition) in adverse atmospheric conditions (as in winter), and, with a balanced release over the years, prevents or at least lowers, automatically, the formation of ice resulting from atmospheric humidity, or of verglas, or the settling of snow, in the case of snow falls which are not abundant, lowering the freezing point and allowing time for the routine intervention of salt- spreading machines and snow ploughs; said results being achieved without corrosive attack of the metals and the cement conglomerates forming the road.
• formulation A preferably consists of:
• alkylene glycol (1-10%); where the inorganic salt is usually a carbonate of alkaline and/or alkaline earth metals, preferably calcium carbonate.
• the composition in question is normally added to a bituminous preparation essentially consisting of 30 to 60% of the said composition, preferably 45 to 55%, and 40 to 70% of bitumen, preferably 45 to 55%, relative to the total weight of the preparation.
• This preparation may therefore be used for the composition of a bituminous conglomerate essentially consisting of the said preparation in combination with an inert, inorganic, granulated material, preferably chosen from silica and/or limestone; the preparation is preferably present in an amount ranging between 3 and 10% while the inert, inorganic, granulated material is preferably present in an amount ranging between 90 and 97%, relative to the total weight of the conglomerate.
• composition of the present invention may be used in the form of a concentrated aqueous solution of a preparation which can be sprayed onto the road surface, both beforehand, if snow falls or ice formation on the asphalt are expected, and after the formation of ice or snow on the road, in order to dissolve them.
• formulation B preferably consists of:
• the poly amine alkylamide is an adhesion activator which binds the fatty chain to the bitumen and the polar amine head to the surface of the acidic admixtures (e.g. siliceous RSiOH) in accordance with the following reaction:
• the preparation present in solution form dissolves the ice and/or snow owing to the interactions described above in case A, with the difference that this time binding of the fatty chain of the surfactant to the bitumen occurs only on the superficial part of the asphalt. It is not necessary, moreover, to add carbonates, since the preparation is present in an aqueous solution.
• compositions according to the present invention may be performed using the methods known in the art such as, for example, those which are indicated below.
• the solid components are fed, by means of a suitable conveyor, into a specially designed mixer connected to a suitable dust recirculating capture and elimination system.
• liquid components are added in succession and mixing is continued to allow adsorption thereof on the powders and/or solid crystals previously mixed.
• the preparation is discharged into a screw extractor which feeds an annular press where, under particular temperature and pressure conditions, a kind of sintering of the components is performed.
• materials with a high melting point such as grains of powders coated with additives, treated in this system, owing to the local fusion which combines the individual grains of powder, are converted so that the product is intimately bonded and in each small grain ( ⁇ 10 micron) there is always the same percentage composition.
• the preparation of the self de-icing conglomerate i.e. supplemented according to the present invention with formulation "A"
• formulation "A” envisages adding the preparation to the bitumen heated to melting point (about 140-160 0 C) in concentrations which vary from 3 to 6%.
• bituminous composition of the present invention also includes an inert granulated material
• the road pavings made with the composition in question prevent or at least delay over time the formation of ice adhering to the said paving, in the event of temperatures below zero, or prevent the formation of ice resulting from "freezing rain”, or also prevent the "adhesion" of falling snow down to temperatures of 4 -
• compositions according to the present invention differ from the known art as regards the following aspects:
• bitumen film they are perfectly dispersed in the bitumen film so as to exercise their anti-ice action both on the exterior of the road surface (which makes contact with the tyres) and within the small channels inside the final structure of the draining/noise-damping conglomerates characterized by large internal areas lined with the film of supplemented bitumen, in contact with the water or moisture;

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Combustion & Propulsion (AREA)
• Materials Engineering (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=37106298

Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (5)

Family Cites Families (5)

• 2006
  • 2006-02-22 EP EP06727334A patent/EP1987103A1/de not_active Withdrawn
  • 2006-02-22 WO PCT/IB2006/000618 patent/WO2007096690A1/en active Application Filing

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events