摘要:
The invention relates to a process for the preparation of mixtures containing bitumen and thermoplastic polymer at a high concentration, stable during storage, with particular characteristics of easy processability and movability which, once diluted, allow modified bitumens to be obtained with high performance characteristics. In particular, the process allows mixtures containing bitumen, thermoplastic polymer and wax, to be prepared, wherein the polymer is in a quantity varying from 5 to 30% by weight with respect to the weight of the mixture consisting of bitumen and polymer, and the wax is in a quantity varying from 4.7 to 16.7% by weight with respect to the weight of the total mixture, and comprises reacting a concentrated mixture (A), stable during storage, containing bitumen and from 5 to 30% by weight of thermoplastic polymer, with a hydrocarbon wax containing at least 40 carbon atoms and having a melting point of at least 700C, in a weight ratio between the mixture (A) and wax ranging from 100:5 to 100:20, at a temperature ranging from 160 to 2000C and for a time ranging from 15 minutes to 7 hours, preferably from 15 to 120 minutes. An object of the invention also relates to new mixtures containing bitumen and thermoplastic polymer at a high concentration and mixtures obtainable from these by dilution.
摘要:
Polymeric foam and polymeric foam products that contain a foamable polymer material, at least one hydrofluorocarbon (HFC) blowing agent, an infrared attenuating agent such as nanographite, and propylene carbonate, ethylene carbonate, or butylene carbonate as a process additive are provided. In one or more embodiments, the HFC blowing agent is 1,1-difluoroethane (HFC-152a), 1,1,1,2-tetrafluoroethane (HFC-134a), or a combination of 1,1-difluoroethane (HFC-152a) and 1,1,1,2-tetrafluoroethane (HFC-134a). The propylene carbonate, ethylene carbonate, or butylene carbonate acts as a cell enlarger to increase the average cell size of the foamed product, as a process aid, as a plasticizer, and lowers the die pressure. The inventive foam composition produces extruded foams that have insulation values (R-values) that are equal to or better than conventional extruded, closed cell foams produced with 1-chloro-1,1-difluoroethane (HCFC-142b). In exemplary embodiments, less than 4% of the cells are open cells. A method of forming an extruded foam product is also provided.
摘要:
The invention concerns a composition and a method for producing a road surface course for roadways with little or moderate traffic corresponding to not more than about 5000 vehicles per day. The composition is based on black japanned aggregates, the aggregates being 2/4 to 2/6 chippings and the lacquering being obtained by a bitumen emulsion. When the surface course is being produced, sand and a bitumen emulsion with controlled fracture and viscosity are spread over the black japanned aggregate composition surface, the whole being then compacted. The invention also concerns a corresponding surface course.
摘要:
The present invention provides a method of producing a storable bituminous coated material suitable for use as foothpath and/or carriageway material in a wearing course, basecourse and/or roadbase. The method comprises providing coarse and fine aggregate particles and mixing at least one of the coarse and fine aggregate particles with hot bitumen or bitumen emulsion in which the bitumen is a hard grade bitumen, and mixing the coated coarse and fine aggregate particles, in the absence of soft grade bitumen, with a slow breaking bitumen emulsion in which the bitumen is a hard grade bitumen.
摘要:
Polyether-polyurethane foam materials impregnated with bitumen are disclosed. These foam materials find use as sealing strips against moisture, draughts and dust, particularly in the construction of roofs and walls of a building with overlapping formed metal or cement or similar sheets where a strip is inserted in the overlap of two adjacent sheets to provided the required sealing therebetween. The sealing strips can also be used to seal adjacent tiles on a roof between the underside of the tile and its supporting batten or rafter. The bitumen may be a bitumen emulsion, hot bitumen or kerosene-diluted bitumen. The concentration of bitumen in the foam materials can be in excess of 600 kg/m3.
摘要:
The present invention provides a method of producing a storable bituminous coated material suitable for use as foothpath and/or carriageway material in a wearing course, basecourse and/or roadbase. The method comprises providing coarse and fine aggregate particles and mixing at least one of the coarse and fine aggregate particles with hot bitumen or bitumen emulsion in which the bitumen is a hard grade bitumen, and mixing the coated coarse and fine aggregate particles, in the absence of soft grade bitumen, with a slow breaking bitumen emulsion in which the bitumen is a hard grade bitumen.
摘要:
A method of manufacturing molded products (or foamed and molded asphalt/urethane foam products) most suitable for sound-proof, vibration control and sealing members which are applied to the floor panel, dashboard and the like in a car, for example, and more particularly a method of manufacturing foamed and molded asphalt/urethane products comprising introducing polyalkylene polyol having at least two or more hydroxyls in a molecule and polyisocyanate having two or more isocyanate radicals into a mold together with a catalyst and a foaming agent, and reacting them in it, wherein said polyalkylene polyol includes asphalt previously emulsified and dispersed therein; and a laminated structure including a layer of foamed asphalt/urethane foam made according to the method.
摘要:
A method of manufacturing molded products (or foamed and molded asphalt/urethane foam products) most suitable for sound-proof, vibration control and sealing members which are applied to the floor panel, dashboard and the like in a car, for example, and more particularly a method of manufacturing foamed and molded asphalt/urethane products comprising introducing polyalkylene polyol having at least two or more hydroxyls in a molecule and polyisocyanate having two or more isocyanate radicals into a mold together with a catalyst and a foaming agent, and reacting them in it, wherein said polyalkylene polyol includes asphalt previously emulsified and dispersed therein; and a laminated structure including a layer of foamed asphalt/urethane foam made according to the method.
摘要:
An asphalt foam having open cells wherein asphalt mixed with an alkali metal silicate is fixed to the wall of the open cells. The asphalt foam is useful for a joint filler, a vehicle floor material, etc. A method of producing the asphalt foam, which comprises the steps of impregnating an open cell foam sheet (10) with an aqueous mixture (2) consisting of asphalt emulsion and an aqueous solution of an alkali metal silicate, and drying the impregnated foam sheet (10').
摘要:
Methods are provided for predicting the properties of an asphalt fraction that contains two or more asphalt components based on measurements of the viscosity versus temperature profile for the components of the asphalt fraction. The viscosity versus temperature profile for each component can be used to determine characteristic (such as limiting) values for the viscosity and temperature for a components. Examples of characteristic values for an asphalt component are the asymptotic values of viscosity at infinite temperature (ηinf) and the finite temperature at which the viscosity diverges (T0). Once these characteristic values are determined, the characteristic values for each component can be combined in a weighted average to determine ηinf and T0 for the asphalt blend. Based on this ability to determine characteristic values for an asphalt blend based on the properties of individual blend components, appropriate blends of asphalts can be selected in order to arrive at an asphalt blend with desired properties.