Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1994-06-21
1996-03-05
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524140, 524141, 524143, 524145, 524404, 524405, 524415, 524416, 524417, 524492, 524493, 524494, C08J 510, C08K 334, C08L 2300
Patent
active
054968810
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fireproofing compound containing binders, flameproofing agents, fibers and plasticizers and to the use of the fireproofing compound.
2. Discussion of Related Art
In the building industry in particular, the structural elements used, such as for example ceilings, walls, partitions, girders and columns etc., must have adequate fire resistance. To this end, there are legal provisions which stipulate the period for which the structural elements have to withstand a fire. Openings in such structural elements (for cables and slots for tubes or joints) have to show the same fire resistance as the structural elements in which they are situated. Accordingly, a number of fireproofing compounds are used, for example, to coat the structural elements to make them fireproof or to increase the fire resistance of the sealing systems for the openings.
The sheaths and insulations of electrical cables and plastic pipes consist of inflammable materials which, after ignition, can spread the fire very quickly and which, in addition, conceal the danger of filling workshops and escape routes with smoke and, at the same time, of forming corrosive or toxic combustion products. These risks can generally be minimized by fireproof coatings.
DE-PS 20 65 117 describes a fireproofing compound which contains chlorinated hydrocarbons, antimony trioxide and asbestos fibers in addition to other substances in an aqueous polymer emulsion. This compound is used as a protective coating for electrical cables. In the event of fire, however, the chlorine-containing compound gives off not only chlorine compounds, but also hydrogen chloride gas which is both toxic and highly corrosive. In addition, the fireproofing compound described in DE-OS 20 65 117 contains antimony trioxide which is regarded as a carcinogenic substance and also asbestos fibers which are now known to have a health-damaging effect.
DE-PS 20 39 969 also describes a fireproofing compound containing chlorinated hydrocarbons. The compound in question may also contain asbestos and antimony compounds as further components. Accordingly, the fireproofing compound according to DE-PS 20 39 969 also has the unfavorable properties mentioned above and shows adverse health-damaging effects.
Although the fireproofing compound disclosed in DE-OS 27 24 604 avoids the use of asbestos fibers, it still contains chlorinated hydrocarbons and antimony trioxide. Accordingly, the fireproofing compound according to this document also shows unfavorable health-damaging effects.
The use of a fire-retarding compound for coating electrical cables and lining cable runways is described in DE-PS 28 44 693. The problem addressed by the invention to which this document relates was to modify the fireproofing compound described in DE-PS 20 39 969 in such a way that asbestos need no longer be used. However, the compound used in accordance with DE-PS 28 44 693 still contains an organic halogen compound and, optionally, antimony compound which leads to the disadvantages already described.
Halogen-free fireproofing compounds are also known from the prior art, but contain large quantities of health-damaging antimony compounds, such as antimony trioxide for example. Despite a high content of antimony compounds, these known fireproofing compounds show poor fireproofing properties. For example, cables with a halogen-free sheath and a halogen-free insulation, such as telephone cables with PE sheaths and insulations, cannot be protected with a commercially available product of this type in such a way that the requirements of DIN 4102, Part 1 (Class B1 Building Materials--Flame-Resistant Building Materials) are satisfied.
On account of the risks attending fires involving PVC cables (heavy smoke generation, evolution of toxic and corrosive gases), numerous attempts have also been made to replace PVC by polyolefins or by halogen-free elastomers. However, the fire risks attending these new types of cables are often no less than those attending PVC cabl
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DIN 4102, Part 1 (Class B1 Building Materials--Flame-Resistant Building Materials.
Annemaier Dieter
Graf Robert
Chemische Fabrik Gruenau GmbH
Jaeschke Wayne C.
Michl Paul R.
Ortiz Daniel S.
Rajguru U. K.
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