DE2247503A1 - METHOD OF APPLYING A TEMPORARY RAINPROOF COATING TO WOODEN WOOL PANELS - Google Patents

Description

OR.-ING. BY KREISLER DR.-ING. BEAUTIFUL FOREST DR.-ING. TH. MEYER DR. FUES DIPL-CHEM. ALEK VON KREISLER DIPL.-CHEM. CAROLA KELLER DR.-ING. KLOPSCH

COLOGNE 1, DBICHMANNHAUS

Cologne, September 26th, 1972

Kl / Ax

BPB Industries Limited, Ferguson House, 15/17 Marylebone Road, London, N.W.L

(England).

Procedure for the application of a temporary rain

s on wood wool panels

The invention relates to an improved method for achieving a temporary rain-resistant coating Wood wool panels or other building panels with a porous or open structure and a method for applying this rainproof cover.

Wood wool panels are well known in the construction industry and have been used for construction and insulation purposes for many years. These panels consist essentially of wood wool and an inorganic binder or cementing agent. They are made by mechanical mixing the constituents, seizure and deposition or ripening. In the UK, wood wool panels conform to the UK Standard 1105: 1963. They are available in thicknesses from 25th to 102 mm manufactured.

Wood wool panels are used in roof structures in considerable quantities used, but are normally not suitable for direct application of the weatherproof covering, without first filling the gaps and cavities in such a way that they are closed, even and smooth Show surface. So far this surface filling has existed

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from a cement-sand mortar which, after setting and hardening, is used to hold the weatherproof covering has a suitable surface. The weatherproof surface exists usually from a composite three-layer cover layer of bitumen roofing felt according to CF, Part 3, 1970, or a roof covering made of mastic asphalt, which according to CP 144 * part 4, 1970, is applied.

The surface filling of cement and sand, however, offers building panels that are weatherproof before the application Coverings are exposed to the rain, only an insignificant resistance to the penetration of water. A significant one Amount of free water can be soaked up in this way and retained in the finished roof structure for a long time, thereby significantly increasing the Thermal conductivity and other serious problems.

In order to eliminate this disadvantage, wood wool panels are used offered and sold, with their surface exposed to the weather, a layer of bitumen roofing felt is continuously glued. However, covering the panels with roofing felt is an expensive process since the roofing felt itself is a composite that is separate Manufacturing process requires.

The invention relates to wood wool panels, which on the outward-facing surface with an improved, temporarily rain-resistant cover are provided that the weatherproof covering can be applied later. The resistance to the penetration of water is considerably greater than that of panels whose surface is filled with sand-cement mortar, and the production of these Boards is lighter and more economical than boards with bitumen roofing felt.

The invention also includes the manufacture of regenbe-3098U / 1 109

permanent wood wool panels according to a method, which is characterized in that one on the wood wool panels, applies a water-resistant thermoplastic material * that a proportion of filler or a filler of fgemise! may contain.

The invention is also directed to new wood wool panels, on which a layer of water-resistant thermoplastic material is applied, which has a proportion of may contain a filler or filler mixture «.

The thermoplastic material can consist of bitumen, coal tar or another pitch or consist of other natural or synthetic polymers. It can be through additives, e.g. plasticizers, plasticizing oils and resins, be modified. It can be made partly or entirely from waste material or regenerated material, e.g. from ground bitumen waste products with a high bitumen content The proportion of thermoplastic material can be between $ 5 and IOO56 lie.

Preferably, as the thermoplastic material is a hard grade bitumen having a softening point (ring and ball) is in the range of 70 to 16O ⁰ C, preferably 80 to 12O ⁰ C, and a penetration at 25 ⁰ C in the range of 5 to 50, preferably 10 to 45, determined according to the test methods laid down in British Standard 3235/1964.

Suitable fillers are, for example, one or more of the materials mentioned below in amounts from 0% to

Aggregates, e.g. sand, perlite and vermiculite

(distended or not distended);

inorganic powder, e.g. limestone powder, slate powder,

ground fuel ash, talc, mica;

Fibers: animal, vegetable, mineral

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and synthetic fibers, e.g. made of glass, Asbestos and jute; ■

Waste materials, e.g. paper, sawdust, ground wood wool panels, textiles, felt and Fibers and polymers.

For the surface treatment of the wood wool panels, the bitumen is heated to a temperature above its melting point and mixed with the filler in a heated Kesael, wherein the temperature preferably in the range of 150 to 25O ⁰ C, advantageously in the range τοη 1Θ0 dead 22O ⁰ C. It may be necessary to preheat the filler separately beforehand. The mixture is dropped onto the wood wool plate and spread out with a heavy roller. It is advisable to wet the roller with a sticking agent or release agent, for example soap, in order to prevent the mixture from sticking to it. The rolling presses the hot mixture into the spaces between the plate so that, after cooling, good mechanical interlocking and a closed, smooth surface are achieved. Before rolling, the mixture can be spread with a trowel, doctor blade, additional hot roller, by extrusion, curtain coating, etc. To accelerate the cooling of the coated panels (bit cold air blowers can be used or water can be sprayed on.

According to the invention, the applied thermoplastic layer should be as thin as possible and not thicker than is necessary to achieve a smooth, even surface. Usually it is no thicker than 5 mm.

The surface treated according to the invention has the advantage that it is essentially waterproof, and that the Layer can be easily applied.

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example 1

6 parts by weight of dry sand in accordance with the British Standard BoS.1198: 1955, type 1, were mixed with 1 part by weight of fine lime powder "mixed ($ 95 passing through a sieve having a MaBchenweite of 74 a) The mixture was heated to 20O ⁰ C. 1 part by weight of BlasMtumen (Shell type R 85/25) was also ^{heated to 20O 0} C and mixed with the aggregate. The mixture was quickly applied to a wood wool board and rolled to a thickness of about 3 mm with a heavy roller that had been previously wetted with a soap solution. An even, uniform, non-stick coating was obtained as soon as the covering had cooled to room temperature. . .

Example 2

3 parts by weight of dry sand corresponding to the British Standard B.S. 1198: 1955, type 1, and 1 part by weight of ground ash Passage through a sieve with a mesh size of

149 u) were heated to 200 ⁰ C and mixed with 1 part by weight of bitumen R 85/25 at 200 ⁰ C. The mixture was quickly applied to a wood wool board and rolled to a thickness of about 3 mm with a heavy roller that had been previously wetted with a soap solution. An even, uniform, non-sticky coating was obtained as soon as the covering had cooled to room temperature.

Example 3

4 parts by weight of dry sand according to British standard BS 1198: 1955, type 1, were ^{heated to 20O 0} C and mixed with 1 part by weight of bitumen R 85/25 at 200 ^{0 C.} The mixture was quickly applied to a wood wool board and rolled to a thickness of about 3 mm with a heavy roller that had been previously wetted with a soap solution. An even, uniform, non-sticky coating was obtained as soon as the covering had cooled to room temperature.

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Example 4

6 parts by weight “parts of dry sand according to the British standard BS1198: 1955” type 1, and 1 part by weight of fine slate flour (99 # passage through a sieve with a mesh size of 74 yes) were ^{heated to 20O 0} C and 1 part by weight. - Part of bitumen R 85/25 mixed at 20O ⁰ C. The mixture was quickly applied to a wood wool board and rolled to a thickness of about 3 mm with a heavy roller that had been previously wetted with soap solution. An even, uniform, non-sticky coating was obtained as soon as the covering had cooled to room temperature.

Example 5

4 parts by weight of heated dry sand in accordance with the British Standard BS1198t1955, type 1, and 4 parts by weight of ground waste of bituminous roofing felt (10OJt passage through a sieve having a mesh of 4.8 mm) were applied to 200 ⁰ C and with 1 wt .-part bitumen R 85/25 mixed at 200 ⁰ C. The mixture was quickly applied to a wood wool board and rolled to a thickness of about 3 mm with a heavy roller that had been previously wetted with soap solution. An even, smooth, non-sticky coating was obtained as soon as the covering had cooled to room temperature.

\ Example 6

2 parts by weight of finely ground wood wool boards (1009t passage through a sieve with a mesh size of 1.6 mm) were mixed with 1 part of bitumen R 85/25. The mixture was heated to 200 ⁰ C. It was then quickly applied to a wood wool board and rolled to a thickness of about 3 mm with a heavy roller previously wetted with soapy water. An even, uniform, non-stick coating was obtained as soon as the covering had cooled to room temperature.

The resistance of the coating described in the preceding examples to the penetration of water was increased

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The following method tested: A sample of I50 mrn χ 150 mm was cut off from the treated wood wool board. A steel pipe with an inside diameter of about 75 mm and a length of 75 mm viurde with plasticine (Kne :. mass) tightly attached to the waterproof surface of the plate. The top of the tube was closed with a rubber dung plug closed, through which a glass tube about 7 mm in diameter, which was provided with a cnr scale, passed was. The pipes were up to a height of 300 mm with. Filled with water at a temperature of 20 + 2 ° C. On the Meniscus in the glass tube was left a few drops of light oil swim to prevent evaporation of the water. After 24 hours there was no change in the position of the meniscus occurred.

Example 7

The one described in example J5. Mixture was made and spread on the surface of a moving wood wool board using an electrically heated, stationary applicator. After the surface had cooled to 60 ^° C., it was pressed with the aid of a freely moving cold roller. An even, even, non-sticky coating was obtained as soon as the top. surface had cooled to room temperature.

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Claims (9)

Claims 1) Process for the production of rain-resistant wood wool panels, characterized in that a water-resistant thermoplastic material is applied to the plates brings up. 2) Method according to claim 1, characterized in that a thermoplastic material is used which contains a filler or a mixture of fillers. 3) Method according to claim 1 and 2, characterized in that bitumen is used as thermoplastic materials, Coal tar or other pitch or other natural or synthetic polymers are used. 4) Process according to Claims 1 to 3 t, characterized in that thermoplastic materials are used which contain modifying additives. 5) Process according to claims 1 to 4 »characterized in that that thermoplastic materials are used, some or all of which are made from waste material or regenerated Material. 6) Process according to claims 1 and 2, characterized in that a hard bitumen with a softening point of 70 to 160 ⁰ C and a penetration of 5 to 50 is used as the thermoplastic material, characterized in that 7) Wood wool panels, / on them a water-resistant thermoplastic Material is applied which contains a proportion of filler or a filler mixture. 8) wood wool panels according to claim 7, characterized in that the thermoplastic material bitumen, coal tar or another thump is applied. 9) woolen wood panels according to claims 7 and 8, thereby 3098U / T109 indicates that the thermoplastic material is a hard bitumen with a JSr Weichüngapunlci; of 70 ⁰ C and a penetration of 5 bia 50 is applied to 16O. 309 ^ 14/1109