EP3109361A1 - Photoluminescent sheet of bituminous material - Google Patents

Abstract

The invention relates to a photoluminescent bituminous sheet which is formed from one or more bituminous layers, wherein a streubares and photoluminescent material is applied to an outer bituminous layer having a melting temperature which is above a processing temperature of the outer bituminous layer and below a melting temperature of the one or more bituminous layers and a method for producing the photoluminescent bituminous sheet.

Description

The invention relates to a, in particular designed as a roofing membrane, photoluminescent bituminous membrane.

Out WO 2012/150191 A2 For example, a recyclable bituminous roofing material is known, which is formed by one or more bituminous layers and is also provided with an inlay and / or reinforcement.

DE 10 2007 048 177 describes a roof covering with reflective coating, which is formed of retroreflective glass beads. The roofing membrane, which is in particular a bituminous or polymer bitumen roofing membrane, can be used with its light-emitting coating as heat protection in the case of strong solar radiation and for energy saving in the air conditioning of rooms. However, the roof cover is not recyclable because of the solid components used for the coating.

DE 20 2011 108 634 U1 discloses a field marker by an electric lighting assembly, wherein the electric lighting device is mounted in a line-shaped arrangement on the bottom surface. The presented electric lighting device, however, requires electrical power to provide a bright field marking.

It is desirable to preserve the recyclability of bituminous sheet material while still providing comparatively easy opportunity for a luminous marking on a bituminous sheet. The invention has for its object to provide a corresponding bitumen sheet and a manufacturing process.

According to the invention the object is achieved by a photoluminescent bituminous membrane of claim 1 and a manufacturing method of claim 17.

According to the invention, a photoluminescent bituminous sheet is proposed, which is formed from one or more bituminous layers, wherein a streubares and photoluminescent material is applied to an outer bituminous layer having a melting temperature above a processing temperature of the outer bituminous layer and below a melting temperature of the one or more bituminous layers.

An advantage of the invention lies in a comparatively simple possible provision of luminous markings on the bituminous sheet by means of the scatterable and photoluminescent material. This makes electrical power connection or external irradiation of the bituminous sheet superfluous. Since the material used, for example, for markings is streubar, a simple production of the photoluminescent bituminous sheet is conceivable, possibly existing and already known process steps for producing a bituminous sheet can be maintained unchanged. Consequently, a low cost for the inventive provision of a photoluminescent bituminous membrane is conceivable. The content of the international patent application WO 2012/150191 A3 is hereby incorporated by reference into the disclosure of this application. The described production methods for the roofing material formed as a bituminous sheet are hereby added to this description.

Furthermore, this use of bituminous membranes has the advantage that after a typical life of bituminous membranes, which is in the range of use as a roof covering at 20 to 30 years, a re-use of the bitumen contained in the bituminous sheet with melting and subsequent reformulation is possible.

The fact that the scatterable and photoluminescent material has a melting temperature which is above the processing temperature of the outer bituminous layer has the advantage that melting of this material in the production is thus avoided. Such melting would lead to a deterioration in the emission brightness of the photoluminescent bitumen sheet due to partial coverage of the frangible and photoluminescent material by bitumen.

On the other hand, the invention provides that the melting temperature of the scatterable and photoluminescent material is below the melting temperature of the one or more bituminous layers. This ensures that, when the bitumen is intended to melt, the scatterable and photoluminescent material applied to it is also melted, which ensures, for example, a recyclability of the photoluminescent bituminous sheet according to the invention.

Preferred developments are the subject matter of the subclaims and indicate in particular advantageous possibilities, such as the above-described photoluminescent and recyclable bituminous membrane, in particular roofing membrane, within the scope of the task as well as further advantages to realize or design.

In a preferred embodiment of the invention, the photoluminescent bituminous membrane is designed as a roofing membrane or forms part of a roofing membrane. The fact that roofing membranes are regularly exposed to direct sunlight, this preferred development has the advantage that the necessary for luminance of photoluminescent material previous light irradiation is present regularly. Furthermore, the application of scattered and photoluminescent material according to the invention as an additional coating can form a heat protection in the case of strong solar radiation and serve for energy saving in the air conditioning of rooms.

In a further preferred embodiment, the scatterable and photoluminescent material is formed as polyethylene (PE) granules. The use of a granulate in this development has the advantage that particles contained in the granules are more robust against external influences, for example as regards adhesion to the bituminous membrane, which is preferably designed as a roofing membrane, as fine-grained materials. Furthermore, the use of a PE granulate can increase the recyclability of the scatterable and photoluminescent material. PE is an almost ideal plastic for recycling, because while many other plastics degrade very much as a result of thermal stress during the recycling process, PE can be recycled without significant damage. In a variant of this development, the PE granules are formed from PE balls.

In a further preferred development of the photoluminescent bituminous membrane, the PE granules are produced with the addition of photoluminescent additives, in particular of photoluminescent rare earths. This development has the advantage that the use of photoluminescent rare earths leads to the fact that the PE granules are not toxic. In a variant of this development, PE particles are applied to photoluminescent additives, which ultimately leads to the PE granules. In a further variant, a PE masterbatch is used to produce the PE granules, in which photoluminescent additives, in particular photoluminescent rare earths, are added.

In a preferred embodiment, the photoluminescent bituminous membrane is at least 80%, in particular over 90% recyclable. In a variant of this development, the photoluminescent bituminous membrane is 95% recyclable. Such good processing values are achieved by a suitable choice of the substances for the production of the bituminous layers and of the scatterable and photoluminescent material. In particular, the recyclability of bitumen and PE leads to a high proportion of recyclable products in the photoluminescent bituminous membrane. This is particularly advantageous in that burning of the bituminous membrane is very harmful to the environment and leads to a high CO ₂ emission.

In a further development of the invention, the photoluminescent bituminous membrane, in particular designed as a roofing membrane, has at least one insert and / or reinforcement, which consists of fibers or wires embedded in a bituminous layer, or of one or more types of plastics polypropylene, polyamide, polyethylenes, polyethylene , Polyvinyl chloride, polyacrylonitrile, ethylene vinyl acetate. This development has the advantage that a dimensional stability of the photoluminescent bituminous membrane can be supported. In a variant of this development, the insert and / or reinforcement consists almost exclusively of a material having a melting temperature which is between 50 ° C and 220 ° C, more specifically between 100 ° C and 200 ° C. This has the advantage that the insert and / or reinforcement is melted down with a melting of the bituminous sheet, which ensures recyclability of the photoluminescent bituminous sheet. In a further variant of this development, the photoluminescent bituminous membrane has as a liner a polyester fleece with a melting point at about 250 ° C.

A choice of liner or reinforcement, or photoluminescent material, also depends on the bitumen used for the bituminous sheet. That's the temperature, in which the bitumen becomes liquid (ie the processing temperature), depending on the type of bitumen. When filler and modifier are added to the bitumen and the bitumen is modified, it produces a bituminous mass, a bitumen compound that has a high viscosity. In such a type of modified bitumen and thus a bitumen compound with numerous additions (fillers, modifier), it is necessary - to ultimately give the bitumen compound a liquid form - to keep the processing temperature higher, for example to 200 ° C. If only a few additions are present, the bitumen compound may already be liquid at a lower temperature, say at 100 ° C. The processing temperature of the corresponding bitumen type is thus 100 ° C. In most cases, the bituminous coating bath has a processing temperature of about 180 ° C.

In one embodiment of the invention, the outer bituminous layer has a softening temperature between 40 ° C and 150 ° C.

In one development of the invention, the one or more bituminous layers are formed from a distillation bitumen of the grade B70 / 100 or B160 / 200, which is blended with a polyethylene wax. This has an advantageous effect on the melting temperature.

In a further development, the one or more bituminous layers of a distillation bitumen are formed, with a linear styrene-butadiene-styrene (SBS) -Anteil with a ratio of more than 1: 4 of linearly constructed to radially structured SBS portion. In one development, the one or more bituminous layers are formed from a distillation bitumen with an SBS fraction between 7% and 13.5%.

In a further development of the invention, the photoluminescent bituminous sheet has a web thickness between 1 mm and 10 mm. In a preferred variant of this development, the photoluminescent bituminous membrane has a web thickness of 4 mm. Low web strength can facilitate processing of the photoluminescent bitumen web, for example by cutting.

In a preferred development of the photoluminescent bituminous membrane, an arrangement of the scatterable and photoluminescent material on the outer bituminous layer forms a structured marking of the photoluminescent bituminous membrane, which is designed in particular as a roofing membrane. Such a structured marking is in a variant of this development, a pattern formed by lines and / or points. In another variant, the structured mark is a lettering that can be used for advertising and / or information purposes. An advantage of the structured marking formed by the scatterable and photoluminescent material of this development is that they are also legible and noticeable at night, in low light conditions or in the evening.

In a further preferred development of the invention, the scatterable and photoluminescent material forms an additive for a scatterable and non-photoluminescent base material, wherein the scatterable and photoluminescent material is applied to the outer bituminous layer together with the base material. In this development, it is advantageous that the photoluminescent bituminous membrane continues to emit light, but the use of favorable base material leads to a more favorable overall photoluminescent coating of the bitumen membrane. In a variant of this development, a brightness of the photoluminescent bituminous sheet prior to application of the overall coating is preset via a ratio of scattered and photoluminescent material to base material. Thus, a specific and desired brightness can be preset, or the brightness of the photoluminescent bitumen sheet can be deliberately changed depending on a lateral position on the surface.

In a further development of the invention, a first, in particular formed as a PE granules, streubares and photoluminescent material and a second, in particular designed as PE granules, streubares and photoluminescent material applied to the outer bituminous layer, wherein the first material has a first melting temperature and the second material has a second melting temperature, each above a processing temperature of the outer bituminous layer and below a melting temperature of the one or more bituminous layers. The use of different materials in this development can improve the visibility of the photoluminescent bituminous sheet. In a first variant of this development, the first material has a first color and the second material has a second color, wherein the first color is different from the second color. By using different colors, a contrast of a structured mark formed by the two materials can be increased. In a second variant of this development, the first material has a first photoluminescence duration and the second material has a second photoluminescence duration, the first photoluminescence duration being different from the second photoluminescence duration Photoluminescence is. In this second variant of the development, a structured marking formed by the two materials can change depending on the time. Thus, in the evening, a first structured marking can be recognized on the photoluminescent bituminous sheet and, some time later, a second structured marking. The second structured marking arises from the first structured marking in that, for example, the first photoluminescence duration of the first material is exceeded, so that only the second structured marking formed by the second material can be recognized due to emitted light.

In a preferred development, the photoluminescent bituminous membrane is produced by scattering the particulate matter, in particular in the form of PE granules, onto hot-liquid bitumen and, with partial sinking into the hot-liquid bitumen, adhering to the hot-liquid bitumen. As in WO 2012/150191 A2 more specifically, hot bitumen is used for the production of bituminous sheets. This development is advantageous in that previous and already known process steps for the production of bitumen membranes could be maintained unchanged. As an additional process step, only the scatterable and photoluminescent material can be sprinkled onto the hot liquid bitumen which is present regularly during the production of bituminous sheets. Consequently, a low cost for the inventive provision of a photoluminescent bituminous sheet in the context of this development is conceivable.

These and other preferred developments and embodiments of the invention are the subject of the subclaims and drawings and specify photoluminescent bituminous sheets with regard to particularly advantageous embodiments, preferably for use of the photoluminescent bituminous sheet as roofing membrane or as part of a roofing membrane. As explained in the context of the invention, however, the concept of the invention is not limited to the development in relation to the use of the photoluminescent bituminous membrane as a roofing membrane or as a part of a roofing membrane.

In particular, such embodiments of the invention are described below with reference to the drawing. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that manifold modifications and

Changes in the form and detail of an embodiment may be made without departing from the general idea of the invention. The disclosed in the description, in the figures of the drawing and in the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the figures and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article that would be limited in comparison with the subject matter claimed in the claims. For the given design ranges, values within the stated limits should also be disclosed as limit values and be arbitrarily usable and claimable. Identical or similar parts or parts of identical or similar function are, where appropriate, provided with the same reference numerals for the sake of simplicity.

• FIG.1 eine Schnittdarstellung einer ersten Ausführungsform einer als Dachbahn ausgebildeten photolumineszierenden Bitumenbahn;
• FIG.2 eine Schnittdarstellung einer zweiten Ausführungsform einer als Dachbahn ausgebildeten photolumineszierenden Bitumenbahn;
• FIG.3 eine schematische Darstellung eines Herstellungsprozesses einer als Dachbahn ausgebildeten photolumineszierenden Bitumenbahn gemäß einer dritten Ausführungsform der Erfindung.
• FIG.1 zeigt eine Schnittdarstellung einer ersten Ausführungsform einer als Dachbahn ausgebildeten photolumineszierenden Bitumenbahn 100.

Further advantages, features and details of the invention will become apparent from the following description of the preferred embodiments and with reference to the following drawings. In detail, the drawing shows in:

• FIG.1 a sectional view of a first embodiment of a formed as a roofing sheet photoluminescent bituminous sheet;
• FIG.2 a sectional view of a second embodiment of a formed as a roofing membrane photoluminescent bituminous membrane;
• FIG.3 a schematic representation of a manufacturing process of a trained as a roofing sheet photoluminescent bituminous sheet according to a third embodiment of the invention.
• FIG.1 shows a sectional view of a first embodiment of a formed as a roofing sheet photoluminescent bitumen sheet 100th

The photoluminescent bituminous membrane is formed from a bituminous layer 110, wherein a scatterable and photoluminescent material 120 embodied as PE granules is applied to an outer bituminous layer 130. Furthermore, formed by the lines 142, 144, 146, 148 arrangement of the scatterable and photoluminescent Material 120 on the outer bituminous layer 130, a patterned marking 150th

In the FIG. 1 illustrated embodiment of the photoluminescent bituminous sheet 100 is 95% recyclable and has a web thickness of 4 mm.

The scatterable and photoluminescent material 120 has a melting temperature that is above a processing temperature of the outer bituminous layer 130 and below a melting temperature of the one or more bituminous layers.

FIG. 2 shows a sectional view of a second embodiment of a formed as a roofing sheet photoluminescent bitumen sheet 200. This second embodiment is similar to that in FIG. 1 illustrated first embodiment of the bituminous sheet 100th

Compared to the first embodiment, the in FIG. 2 As shown, photoluminescent bituminous sheet 200 has a fifth line 249 and thus another structured mark formed by lines 242, 244, 246, 248, 249. Furthermore, the photoluminescent bituminous sheet 200 has a supporting layer 270 formed by a wire 260. Furthermore, a first scatterable and photoluminescent material 220 embodied as PE granules and a second scatterable and photoluminescent material 225 embodied as PE granules are applied to the outer bituminous layer 230. In this case, the first material 220 has a first color and the second material 225 has a second color, wherein the first color is different from the second color. Furthermore, the first material 220 has a first photoluminescence duration and the second material 225 has a second photoluminescence duration, the first photoluminescence duration being different from the second photoluminescence duration. As in FIG. 2 Further, a first average grain size of the first material 220 is greater than a second average grain size of the second material 225.

FIG.3 shows a schematic representation of a manufacturing process of a formed as a roofing sheet photoluminescent bituminous sheet 300 according to a third embodiment of the invention.

The photoluminescent bituminous sheet 300 is produced in the context of the illustrated production process by scattering the scatterable and photoluminescent material 310 formed as PE granules onto hot-liquid bitumen 320 and partially sinking into the hot liquid bitumen 320 to which hot liquid bitumen 320 adheres.

Continue in FIG. 3 shown are a first and a second Kalibrierrolle 332, 334, a support band 340, on which the hot liquid bitumen 320 is located, and a material feed 350, the scattered and the photoluminescent material 310 to the hot liquid bitumen 320 scatters.

A description of the provision of the hot liquid bitumen 320 on the support band 340 can be made, for example WO 2012/150191 A2 be removed.

Claims (18)

A photoluminescent bituminous sheet formed from one or more bituminous layers, wherein a scatterable and photoluminescent material is applied to an outer bituminous layer having a melting temperature above a processing temperature of the outer bituminous layer and below a melting temperature of the one or more bituminous layers lies. Photoluminescent bituminous membrane according to claim 1, characterized in that the bituminous membrane is formed as a roofing membrane or forms part of a roofing membrane. Photoluminescent bituminous sheet according to claim 1 or 2, characterized in that the streubare and photoluminescent material is a PE granules. Photoluminescent bituminous membrane according to claim 3, characterized in that the PE granules are prepared with the addition of photoluminescent additives. Photoluminescent bituminous sheet according to claim 3 or 4, characterized in that the PE granules is prepared by adding photoluminescent rare earths. Photoluminescent bituminous membrane according to one of claims 1 to 5, characterized in that the photoluminescent bituminous membrane is at least 80%, in particular over 90%, recyclable. Photoluminescent bituminous sheet according to one of claims 1 to 6, characterized in that the photoluminescent bituminous sheet having at least one insert and / or reinforcement which from is formed in a bituminous layer embedded fibers or wires, or of one or more types of plastics. A photoluminescent bituminous sheet according to claim 7, characterized in that the plastics comprise one or more plastics selected from: Polypropylene, polyamide, polyethene, polyethylene, polyvinyl chloride, polyacrylonitrile, ethylene vinyl acetate. Photoluminescent bituminous sheet according to claim 7 or 8, characterized in that the insert and / or reinforcement consists exclusively of a material having a melting temperature between 50 ° C and 220 ° C. Photoluminescent bituminous sheet according to one of claims 1 to 9, characterized in that the bituminous sheet has a web thickness between 1 mm and 10 mm, in particular between 4 mm and 8 mm. A photoluminescent bituminous sheet according to any one of claims 1 to 10, characterized in that an arrangement of the scatterable and photoluminescent material on the outer bituminous layer forms a structured marking of the photoluminescent bituminous sheet. A photoluminescent bituminous sheet according to any one of claims 1 to 11, characterized in that the scatterable and photoluminescent material forms an additive for a scatterable and non-photoluminescent base material, wherein the scatterable and photoluminescent material is applied to the outer bituminous layer together with the base material. Photoluminescent bituminous sheet according to one of claims 1 to 12, characterized in that a first, in particular designed as PE granulate, streubares and photoluminescent material and a second, in particular designed as PE granulate, streubares and photoluminescent material are applied to the outer bituminous layer wherein the first material has a first melting temperature and the second material has a second melting temperature, each above a processing temperature of the outer bituminous layer and below a melting temperature of the one or more bituminous layers. A photoluminescent bituminous sheet according to claim 13, characterized in that the first material has a first color and the second material has a second color, wherein the first color is different from the second color. A photoluminescent bituminous sheet according to claim 13 or 14, characterized in that the first material has a first photoluminescence duration and the second material has a second photoluminescence duration, wherein the first photoluminescence duration is different from the second photoluminescence duration. Photoluminescent bituminous membrane according to one of Claims 1 to 15, characterized in that the scatterable and photoluminescent material, in particular in the form of PE granules, adheres to the bitumen with partial sinking into the bitumen. A method of producing a photoluminescent bituminous sheet formed from one or more bituminous layers, wherein a scatterable and photoluminescent material is applied to an outer bituminous layer having a melting temperature above a processing temperature of the outer bituminous layer and below a melting temperature of the one or more bituminous layers, in particular a method for producing a bituminous sheet according to one of claims 1 to 16. A method according to claim 17, characterized in that , in particular formed as a PE granules, scatterable and photoluminescent material is scattered on hot liquid bitumen.

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