Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1990-04-19
1991-09-17
Group, Karl
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106688, 106805, 106687, C04B 902
Patent
active
050491970
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a composition of matter and more particularly to such a composition useful for the manufacture of building products.
BACKGROUND ART
Settable magnesium cement (sorels cement) compositions are known, and such compositions containing sawdust filler are also known and have previously been used as settable flooring or floor-leveling compositions.
Such compositions generally comprise a mixture of magnesium oxide/magnesium chloride with sawdust or other suitable particulate filler. However, the quality and moisture content of the sawdust is of importance, otherwise the floor may break up, or become chalky and eventually crumble. The water content of the finely-comminuted sawdust component was required to be of less than 12%. It proved to be not easy to maintain this moisture percentage and it was found that higher moisture content gave rise to several problems such as the composition's not setting properly, the reaction not going to completion, and the like. Moreover, the presence of "free" magnesium chloride has been found to cause so-called "sweating". Also, the possibility of corrosion has undoubtedly existed when the composition came into contact with, say, steel or aluminium, usually in the form of door jambs or window sills, rusting steel and corroding aluminium.
DISCLOSURE OF INVENTION
It is thus an object of the present invention to overcome the above and other disadvantages by the provision of a composition of matter, particularly a settable flooring composition, comprising a two-part mix; the first part thereof comprising magnesium oxide, and the other part thereof comprising a magnesium chloride component and a particulate fibrous material component.
Optionally, the mix may comprise additives to reduce any tendency for the mix to corrode metal fittings which may come into contact with the mix, including sodium metasilicate, zinc sulfate and aluminium sulfate.
Preferably, a coarse, fibrous long-strand sawdust--known as "green fibrous sawdust"--is employed as the particulate fibrous material component, the sawdust advantageously having a moisture content of about 40-50%, preferably 40-45%, by weight.
In order that the reader may gain a better understanding of the present invention, hereinafter will be described a preferred embodiment thereof, with reference to the following Example:
BEST MODE FOR CARRYING OUT THE INVENTION
Example
A settable flooring composition, comprising a two-part mix, was prepared. The proportions of the components were as follows: weight.
The magnesium oxide of the first part was made up into 20 Kg bags, and the components of the second part were premixed and made up into 21 Kg. bags. Once on site, two of the 21 Kg, mixed-component bags were mixed with one 20 Kg bag of magnesium oxide. Sufficient water was added and mixed in well so that the composition was damp throughout but still "crumbly". Excess water will weaken the final product.
If required, to assist adhesion, the area to be coated can be primed with a PVA solution or a dilute magnesium cement slurry. In this example, the area to be coated was wetted using one part of a suitable priming solution (e.g. `MAGNAPRIME`) to two parts of water. While the area was still wet, the inventive composition was spread evenly over it and screeded to a slightly higher level than the desired finished surface, using a timber straight edge. The laid composition was then trowelled down and compacted evenly with a conventional boat-shaped steel trowel.
Generally, the flooring composition has cured sufficiently by the following day to be able to be walked on, although seven days or more should be allowed before a floor covering is laid on the surface.
The inventive composition requires about 50% less magnesium chloride than does the above-described three-part mix and consequently there is less "free" magnesium chloride to cause the so-called "sweating"; moreover, the product is less expensive as a result.
There is some evidence to suggest that a chemical reaction occurs in the pre-mixture of
REFERENCES:
patent: 1965538 (1934-07-01), Stewart
patent: 3667978 (1972-06-01), Vassilersky et al.
patent: 3788870 (1974-01-01), Verth et al.
Group Karl
Magnatex Industries Pty. Limited
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