Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/36—After-treatment
  • C08J9/40—Impregnation
  • C08J9/42—Impregnation with macromolecular compounds
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
  • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
  • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
  • E04B1/66—Sealings
  • E04B1/68—Sealings of joints, e.g. expansion joints
  • E04B1/6812—Compressable seals of solid form
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D1/00—Roof covering by making use of tiles, slates, shingles, or other small roofing elements
  • E04D1/36—Devices for sealing the spaces or joints between roof-covering elements
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
  • C08J2375/04—Polyurethanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2495/00—Bituminous materials, e.g. asphalt, tar or pitch

Definitions

• THIS INVENTION relates to impregnated foam materials and their use to seal surfaces against the entry of air, water, dust and the like.
• Elastic and resilient materials are often used as sealing materials against moisture, draughts and dust.
• a particular application is in the construction of roofs and walls of a building with, for example, overlapping formed metal or cement or similar sheets where a strip is inserted in the overlap of two adjacent sheets to provide the required sealing therebetween.
• Such sealmg strips are also usually required between the underside of such sheets and their supporting battens or rafters.
• Similar strips are also used to seal adjacent tiles or similar on a roof and between the underside of the tile and its supporting batten or rafter.
• sealing material must be flexible in order to conform to the surface that is being sealed.
• Favoured sealing strips are open-pore, absorbent materials impregnated with a substance which, on compression, bonds the open cells of the material together and simultaneously effects the required sealing.
• Typical foams include a reticulated, flexible polyester-polyurethane foam having a three-dimensional uniform open cell structure which can be impregnated with a bitumen emulsion.
• bitumen emulsion which prevents the passage of air, water etc. through the foam material and thus it is advantageous to maximise the amount of bitumen absorbed by the foam material. It was generally accepted in the art that typical maximum bitumen concentrations were about 120 kg/m 3 .
• the concentration of bitumen present in these foam materials can be increased to about 225 kg/m 3 (dry weight).
• a sealing material said material including a bitumen-impregnated foam characterised in that said bitumen is present at greater than 225 kg/m 3 .
• said bitumen is present at a concentration in the range between 230 kg/m 3 to in excess of 600 kg/m 3 .
• said foam is an open cellular foam each cell of which is coated with said bitumen.
• said foam is a polyether-polyurethane foam.
• said sealing material is preferably in the shape of an elongated strip, said strip, optionally, having a configuration on one or more faces thereof which conforms to the shape of the surfaces to be sealed.
• a preferred strip will typically have a base width of 40-50mm and a height of 30-75 mm.
• Said sealing material can optionally be coated on its exterior surface with an acrylic emulsion composition.
• the bitumen is protected from degradation by exposure to ultraviolet and other radiation.
• a further advantage of the acrylic emulsion coating is that it renders the material fire retardant.
• Said composition may also be coloured to coordinate with an exterior colour of the surfaces to which it is applied.
• bitumen is selected from the group including bitumen emulsion, hot bitumen and kerosene-diluted bitumen.
• bitumen emulsion comprising 40% bitumen and 60% water. In the preferred use of bitumen emulsion, after removal of excess emulsion, the water is allowed to evaporate off.
• any suitable means known in the art can be used to saturate the foam and then remove the excess bitumen.
• the foam could be dipped into a bituminous composition for a suitable period, removed from said bituminous composition and excess bitumen allowed to drain from the foam.
• the saturated foam could be squeezed to remove the excess bitumen, for example, by passing between multiple rollers.
• the thus-squeezed or drained foam could be re- dipped into the bituminous composition, removed therefrom and again squeezed or drained to remove the excess bitumen.
• a method of sealing an overlap between two adjacent surfaces including inserting in said overlap a sealing material as hereinbefore described.
• the sealing material In use, the sealing material is pressed into contact with the surfaces to be sealed. If inserting into a pre-existing gap, it is advantageous to apply some pre-compression before inserting the sealing material into the gap in order to accommodate any variations in spacing in that gap. In other cases, where, for example, overlapping roofing or wall sheets are to be bolted together, the nature of that assembly will automatically apply a sufficient compression.
• a polyether-polyurethane foam termed "light duty" under Grade No. L27-180 as supplied by JOYCE FOAM PRODUCTS was cut into four (4) strips, each strip of dimensions approximately 2m x 40mm x 30mm, and labelled Sample 1A, Sample 2D, Sample 3D and Sample 4D.
• the bituminous composition was an emulsion of 40% bitumen and 60% water.
• Sample 1A strip was dipped into the bituminous composition for a brief period and then removed from the solution. The strip was allowed to drain and air dried. The foam was analysed for bitumen content and found to be 441.0 kg/m 3 .
• Sample 2D strip was dipped into the bituminous composition for a brief period and then removed from the solution.
• the saturated foam was then squeezed between multiple rollers to remove excess bitumen adhering to the foam and air dried.
• the single-dipped foam was again dipped into the bitumen composition for a further brief period, removed therefrom, passed between the multiple rollers and air dried.
• the thus double-dipped foam was analysed for bitumen content and found to be - 313.7 kg/m 3 .
• Sample 3D strip was dipped into the bituminous composition for a brief period and then removed from the solution.
• the saturated foam was then squeezed between multiple rollers to remove excess bitumen adhering to the foam and air dried.
• the single-dipped foam was again dipped into the bitumen composition for a further brief period, removed therefrom, passed between the multiple rollers and air dried.
• the now double-dipped foam was again dipped into the bitumen composition for a further brief period, removed therefrom, passed between the multiple rollers and air dried.
• the thus triple-dipped foam was analysed for bitumen content and found to be 469.1 kg/m 3 .
• Sample 4D strip was dipped into the bituminous composition for a brief period and then removed from the solution.
• the saturated foam was then squeezed between multiple rollers to remove excess bitumen adhering to the foam and air dried.
• the single-dipped foam was again dipped into the bitumen composition for a further brief period, removed therefrom, passed between the multiple rollers and air dried.
• the now double-dipped foam was again dipped into the bitumen composition for a further brief period, removed therefrom, passed between the multiple rollers and air dried.
• the now triple-dipped foam was again dipped into the bitumen composition for a further brief period, removed therefrom, passed between the multiple rollers and air dried.
• the thus quadruple-dipped foam was analysed for bitumen content and found to be 603.5 kg/m 3 .
• the present invention can thus provide foam materials impregnated with bitumen to concentrations in excess of 600 kg/m 3 .
• the foam material is a polyether- polyurethane
• a much longer life of the sealing material is possible - of the order of four-fold over a polyester-polyurethane.
• Such impregnated materials with their hitherto unknown high concentrations of bitumen offer improved sealing against moisture, draughts and dust.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Health & Medical Sciences (AREA)
• Electromagnetism (AREA)
• Materials Engineering (AREA)
• Physics & Mathematics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Sealing Material Composition (AREA)
• Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
• Road Paving Structures (AREA)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

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• 1998
  • 1998-04-09 AU AU60774/98A patent/AU705583B1/en not_active Ceased
• 1999
  • 1999-04-09 EP EP99914360A patent/EP1078124A4/de not_active Ceased
  • 1999-04-09 NZ NZ507799A patent/NZ507799A/xx unknown
  • 1999-04-09 WO PCT/AU1999/000269 patent/WO1999053132A1/en not_active Ceased
  • 1999-04-09 CA CA002369796A patent/CA2369796A1/en not_active Abandoned

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