Compositions: coating or plastic – Coating or plastic compositions – Contains fireproofing or biocidal agent
Patent
1991-12-11
1993-11-09
Group, Karl
Compositions: coating or plastic
Coating or plastic compositions
Contains fireproofing or biocidal agent
106 1505, 106 1812, 106735, 106772, 106778, C04B 1100, C04B 206
Patent
active
052598721
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fireproofing covering material with cement matrix.
2. Prior Art
Buildings are generally required to have certain fire resistant performances for their different parts under the Construction Standard Law.
Conventionally, structuring materials such as steel frames and folded plate ceiling are coated with fireproofing covering materials for improvement of their fire resistant performance.
Such fireproofing covering materials are often mixture of rock fiber and cement because of low cost.
This fireproofing covering material consisting of mixture of rock fiber and cement is sprayed to the surface of the structure when used.
The fireproofing layer formed on the structure by the use of such fireproofing covering material, however, does not have sufficient durability. It has only a low strength and high water absorption and high moisture permeation coefficient, resulting in weak adhesion.
In other words, when rock fiber fireproofing covering material is sprayed to a structure such as steel frame and folded plate ceiling, for example, a fireproofing layer is formed on the surface of the structure, but this fireproofing layer is susceptible to separation and peeling off due to internal dewing and water absorption.
Such rock fiber fireproofing covering material is accepted by the Standards for fire resistance, but a higher fire resistant performance is required now.
SUMMARY OF THE INVENTION
This invention is made to solve the above mentioned problems. It is an object of the fireproofing covering material of claim 1 to provide a fireproofing covering material with a largely improved fire resistant performance, and an object of the fireproofing covering material of claim 2 is to provide a fireproofing covering material with largely improved fire resistant performance and durability.
The fireproofing covering material of claim 1 comprises 100 parts by weight of cement, 5 to 35 parts by weight of lime, 5 to 35 parts by weight of gypsum powder and 5 to 35 parts by weight of aluminosilicate gel.
This fireproofing covering material is, for example, mixed with rock fiber and hydrated and sprayed to structures such as steel frames and folded plate ceiling. On the fireproofing layer formed on the structure surface, hydration of lime, gypsum plaster and aluminosilicate gel generate calcium sulfoaluminate-based hydrate product including a large amount of water such as 24H.sub.2 O and 32H.sub.2 O. Such hydrate products serve for heat reduction when heated.
Lime, gypsum powder and aluminosilicate gel themselves have water molecules in their molecular structures and serve for heat reduction effect when the fireproofing layer is heated.
The fireproofing covering material of claim 2 is prepared by mixing 100 parts by weight of powder (consisting of 100 parts by weight of cement, 5 to 35 parts by weight of lime, 5 to 35 parts by weight of gypsum powder and 5 to 35 parts by weight of aluminosilicate gel) with 50 to 300 parts by weight of ceramic microspheres, 10 to 40 parts by weight of ceramic fiber and 5 to 20 parts by weight (solid content equivalency) of synthetic resin emulsion.
The fireproofing covering material may be applied to the structure by wet or dry process.
Application to structure by wet process is performed by spraying the material in viscous fluid state to a structure such as steel frame or folded plate ceiling or by applying it to structure with a trowel.
Application to structure by dry process is performed, for example, by curing a fireproofing covering material in viscous fluid state to form a plate to be fixed with a jig or adhered with adhesive.
This fireproofing covering material largely improves the fire resistant performance of coating materials for steel frames and other structural materials because of heat reduction effect caused by hydrate product with high water inclusion generated by reaction of lime, gypsum powder and aluminosilicate gel when heated and individual heat reduction effect of each of lime, gypsum powder and
Fujinaka Hideo
Shinozaki Mamoru
Shinozaki Yukuo
Group Karl
Marcantoni Paul
Takenaka Corporation
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