Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
  • E04D5/02—Roof covering by making use of flexible material, e.g. supplied in roll form of materials impregnated with sealing substances, e.g. roofing felt
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N5/00—Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch

Definitions

• the invention relates to a sheet material for a roof underlay, which is shockproof, waterproof and permeable to air and steam and comprises a nonwoven fabric impregnated with a bitumen-containing impregnating composition.
• a web material of the generic type is known from European Patent No. 0 027 750, in which the bituminous impregnating composition is applied warm on one side of a non-woven fiber fleece made of polypropylene, polyethylene, polyester or polyvinyl, microholes or microcracks being formed when cooling, which prevent the passage of liquids, but ensure that the material is permeable to air and steam.
• this sheet material has a vapor permeability, the diffusion-equivalent air layer thickness S d varies between 10 m and 200 m. In order to rule out condensation damage in the roof area, however, reliable compliance with maximum S d values of approximately 2 to 3 m is desirable, which means that a serious increase in the water vapor permeability is required.
• the nonwoven fabric is coated with a bitumen layer only on one side and thinly.
• the uncoated side of the plastic fleece is thus exposed to the weather and is destroyed relatively quickly by the action of ultraviolet radiation.
• bitumen-coated side of the sheet material with talc or sand offers reliable protection against sticking to the rolled-up material, but the spreading of the bitumen or sand on the bitumen surface works on the applied sheets in the sense of a strong increase in the wettability with water, which leads to the passage of water through the sheet material in areas of somewhat larger pores or cracks in the bitumen layer.
• the object of the invention is to provide a sheet material which has a uniformly high vapor permeability with simultaneously improved protection against the passage of water, which also ensures improved weather resistance and protection against sticking of the rolled-up material.
• the fleece is impregnated on both sides with the impregnating composition, that the impregnating composition comprises a proportion of paraffin waxes and that the sheet material is needled.
• the fleece is preferably impregnated by an immersion process.
• the double-sided coating of the nonwoven fabric which preferably consists of polypropylene, polyethylene, polyester or polyvinyl with a basis weight between 85 and 200 g / m 2 , means a significant improvement in the weather resistance of the sheet material in addition to an additional increase in the strength of the material.
• the bituminous impregnating mass preferably contains a bitumen of penetration of 3 to 45 mm and has a softening point of 85 to 120 ° C.
• a particular advantage of the addition of paraffin wax results from the fact that the viscosity of the impregnating mass is reduced by a factor of 3, so that the processing or immersion of the nonwoven in the impregnating mass results in all-round wetting and coating of the fibers of the nonwoven is possible in the first place.
• the addition of paraffin means that the water-repellent effect of the bitumen layer on the nonwoven fabric is increased, and furthermore that the rolled-up web material is prevented from sticking. Scattering of the sheet material can therefore be omitted.
• Particularly favorable paraffin wax fractions are approximately 10% by weight of the impregnating mass. Particularly favorable properties with regard to non-stickiness and low wettability with water are achieved for the bitumen coating when the paraffin wax in the impregnating mass has a melting temperature which is above the softening temperature of the bitumen portion of the impregnating mass - preferably around 5 to 20 ° C. In this case, when the webs cool after coating, the wax settles with a larger proportion on the surface, which further reduces the tendency to stick and the water wettability compared to a homogeneously cooling water.
• the processing temperature can be significantly reduced, it is between 100 and 150 ° C, so that temperature-sensitive plastic nonwovens can also be processed.
• the relatively low processing temperature of the paraffin wax additive ensures, as mentioned above, at this ERA Tem p structures a sufficiently small viscosity of the impregnating composition, so that they can be processed also in the relatively low temperature range safely.
• nonwoven fabric can consist not only of organic fibers but also of glass or mineral fibers.
• bitumen 100/40 softening temperature 100 ° C
• anti-aging agent for example octadecyl 3- (3,5-di-tert-butyl-4-hydroxylphenol) propionate
• paraffin wax softening point: 110 ° C
• the impregnating mass with the bitumen and paraffin wax components is produced in the melt in a manner known per se.
• the sheet material is produced by a customary immersion process, in which the nonwoven fabric is completely covered by the bituminous impregnating compound.
• the temperature of the impregnating mass is 100 to 150 ° C during the dipping process, depending on the bitumen type and the paraffin wax content used.
• the sheet material is also needled in a manner known per se in order to form through-openings for air and water vapor.
• the diameter of the passage openings is approximately 0.05 mm to 0.5 mm, the openings being arranged at an approximate distance of 0.5 cm to 2 cm.
• Liquids can not penetrate into the through openings, while the gaseous components are able to diffuse through the openings of the B suspect materials because of their surface tension.
• the sheet material according to the invention can be produced with very good consistency with regard to its vapor permeability, and a desirable maximum diffuse-equivalent air layer thickness S d of approximately 2 to 3 m can be reliably maintained.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Textile Engineering (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (4)

Publications (2)

Family

ID=25834306

Family Applications (1)

Country Status (2)

Cited By (3)

Families Citing this family (1)

Family Cites Families (7)

• 1985
  • 1985-07-27 DE DE19853526970 patent/DE3526970C1/de not_active Expired
• 1986
  • 1986-06-12 EP EP86108033A patent/EP0209712A3/fr not_active Withdrawn

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