DE669724C - Process for the production of fire-retardant coatings on wood or other combustible substances of vegetable origin - Google Patents

Description

Process for making fire retardant coatings on wood or others combustible substances of vegetable origin Since then there has been a danger that The roof trusses of the houses were set on fire by incendiary bombs and entire districts as a result being cremated, special attention has been paid to it, especially the wooden structures in the roof trusses against fire caused by fire bombs protection.

There are a large amount of chemical agents used to impregnate the roof stalls have been proposed, but some of them are quite expensive. And, to the extent that they are cheaper are, have the disadvantage that they are undesirable because of their hygroscopicity of the wood make it moist.

The very simple and cheap way to reduce the flammability by a Abierzug with cement, mortar o. The like. Reduce is not satisfactory because : these materials do not permanently adhere to the wood.

It has now been found that it is possible to create an adhesive on the wood Coating with cement, as the main component to create when you use the cement with one Fiber, in the interests of incombustibility, of course, primarily with one inorganic fiber, and this mixture mixes with a considerable excess pressure applies to wood. The application takes place with a spray gun, from which naturally the elements to be eliminated are preventing the passage of the somewhat coarse mixture of Asbestos and cement make it difficult. The coating must not be hermetically sealed against the wood Shut off outside air because the wood is often still working, and an almost hermetic one Closure can lead to signs of putrefaction if: at some point Moisture has penetrated.

To ensure a certain porosity of the coating, fine-grained quartz is added to the asbestos-cement mixture. Such a mixture consists e.g. B. from 15 parts asbestos, zo parts quartz, 75 parts cement and r oo parts water.

One has the possibility of the composition, of the mixture: to a large extent To vary limits depending on the purpose to be achieved.

Dia it is possible for. a mix cheap short-fiber asbestos to use, the costs for the overarching of this roof; stüihls with the spray gun pretty low.

Of course, according to the method of the invention, construction timbers, Pit wood, slabs on reeds, peat, etc. with this flame-retardant from the start A coating can be provided, in which case the otherwise gray-white mixture with suitable ones Dyes can be added.

A coating can also be used in benches according to the method of the invention the coal seams are made with the asbestos-cement-quartz mixture to reduce the risk of fire to belittle. The protective layer must have a thickness of about 3 mm, around the combustible substances of vegetable origin, such as a roof structure or a. To protect the Kolhlenflö, z, against inflammation, g at all times.

Since the material of the protective layer b "'painting or gating easily drains from an inclined surface, leaving the layer on one Where there is too thin a place where it is unnecessarily thick, the protective layer becomes in at least two layers of: a total layer thickness of about 3 mm at an operating pressure from 3 to ¢ Atm. sprayed on with spray guns.

If the protective layer always has the same color, it must be checked quickly whether it has covered evenly everywhere. Therefore, according to .the invention, a respectively different colored overall is mixed, sprayed, so that closely examined. whether the new layer covers the previously applied everywhere. For example, the mixture used for the first layer is colored black and the second is reddish, while the third can be left the natural light gray tone of the mixture. If the roof structure disappears completely under the first layer: and the black layer again under the reddish or the reddish under the greyish-white, you can be sure that the protective layer has been applied in the necessary thickness. - Older roof structures as well as layers of coal are mostly covered with dust, b @ zw. Sand covers that: make it difficult to spray a well-adhering, fiber-containing coating. In this case it is necessary, first of all: to apply a layer of a mixture of cement and quartz alone. For example, 75 parts of Portland cement are mixed with 25 parts of quartz flour and 100 parts of water to form a cement milk, which is sprayed or brushed on and rubbed in with a coarse brush so that the dust is bound with the cement milk.

One already has. once suggested, decorative coatings, which i.a. also fire-retardant, produced on flammable materials Spraying a mixture that consists mainly of larger particles of the glitter Slate stone contained algolith and next to it various fillers, such as Kieselguhr, limestone, B, imsistein, also asbestos and the most diverse binders, such as glue, rubber, asphalt, gypsum, including cement.

Asbestos has not been used in large quantities, nor has it been recommended him just with cement; as a binding agent together. to: -use. Also this gives way ; Older proposal insofar from the method of the present invention as a binder and filler are to be applied separately to the substrates. It can then never, especially on wood, the firm adhesion that can be achieved in the process strives for the present invention and is necessary for the effect to be achieved.

Claims (3)

PATENT CLAIMS; i. Method of making fire retardant compounds on wood or other combustible substances of vegetable origin in use cementitious mixtures, characterized in that: that a sprayable mixture from cement - as the main component -, asbestos, silica and water in at least two layers with a total thickness of about 3 mm on the one to be protected Surface with the help of spray guns at an operating pressure of 3 to 4 atm. is sprayed on. 2. The method roof claim i, characterized in that the Mixture sprayed on in three differently colored layers, each about 1 mm thick will. 3. The method according to claim i and 2, characterized in that the to be coated Substances, if they are covered with a layer of dust, first with an aqueous one Mixture of cement and quartz alone must be rubbed in before spraying the Asbestos-cement mixture is done.