Stock material or miscellaneous articles – Sheet including cover or casing – Complete cover or casing
Patent
1996-01-17
2000-01-04
Yamnitzky, Marie
Stock material or miscellaneous articles
Sheet including cover or casing
Complete cover or casing
428 71, 428 74, 428323, 4283044, 428920, 428921, 252606, B32B 106, C09K 2100
Patent
active
060107634
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fireproofing material in the form of a loose mixture, more particularly in a sealed flexible bag, containing temperatures of up to 1100.degree. C.,
2. Discussion of Related Art
One such fireproofing material is described in applicant's DE-A1-35 36 625 and has good heat insulating and expansion properties.
The fireproofing material known from this document normally contains a very high percentage of inorganic fibers, such as ceramic fibers and mineral fibers. Fibers such as these are no longer desirable on account of possible carcinogenic properties, even when the fireproofing material is contained in a bag. However, attempts to reduce the percentage of fibers and to use larger quantities of other insulating materials instead have revealed certain disadvantages, such as an increased tendency to flow and poor impermeability to smoke.
Accordingly, the problem addressed by the present invention was to avoid the potential danger of inorganic, more particularly mineral, fibers and nevertheless to obtain good fireproof properties.
SUMMARY OF THE INVENTION
The invention is characterized in that the fireproofing material is free from inorganic fibers and contains at least one flexibly compliant constituent.
DETAILED DESCRIPTION OF THE INVENTION
The high fiber content of known fireproofing materials provided the mixture of individual constituents with a certain internal structure which, in the event of fire, remained intact over substantially the entire temperature range and, at temperatures above the sintering and melting range of the fibers, was replaced by the binding property which those materials then developed. These highly desirable properties of the fibers are now no longer necessary through the absence of inorganic fibers.
It has been found that the resistance of the fibers to heat, although desirable, is not essential. Numerous fire tests have shown that adapted mechanical properties of the mixture of the fireproofing material not only determine its handling and functioning at normal temperatures, they also favorably influence the behavior of the mixture in the event of fire. Thus, it has been found that the at least one flexibly compliant constituent in the mixture is capable of counteracting the tendency of individual constituents to flow, preventing separation, enabling the fireproofing material to be accommodated in an impermeable manner, even when it is packed in small bags, and simultaneously establishing the impermeability of the fireproofing material to smoke through the creation of extended flow paths (labyrinth principle), even when the binder and swelling agent have not developed their effects adequately, if at all, at low temperatures. It has also been found that the flexibly compliant constituent does not have to be particularly heat-resistant. Even when the structure of the flexibly compliant constituents is destroyed in the event of fire, this does not lead to disintegration or collapse of the fireproofing mixture. This is attributable to the fact that the swelling agent and binder are activated at temperatures which the flexibly compliant material no longer withstands and provide for cohesion of the mixture. By virtue of the good heat-insulating effect of the fireproofing material, the mixture is present in unchanged native or only partly modified form with its structure intact immediately behind the layer of fireproofing material affected by heat, so that the favorable mechanical properties remain fully intact.
The fireproofing material according to the invention advantageously consists solely of weather-resistant and moisture-resistant constituents. Depending on the application envisaged, it need only contain one swelling agent or only one binder. However, mixtures of swelling agents and mixtures of binders are preferred because it is possible with mixtures to initiate activation in a continuous or graduated manner substantially uniformly over the entire temperature range occurring in the event of fir
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patent: 5047449 (1991-09-01), Pastureau
Annemaier Dieter
Graf Robert
Grunau Illertissen
J. Murphy Glenn E.
Jaeschke Wayne C.
Szoke Ernest G.
Yamnitzky Marie
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