Compositions: ceramic – Ceramic compositions – Clay containing
Patent
1995-11-17
1997-02-18
Group, Karl
Compositions: ceramic
Ceramic compositions
Clay containing
106900, 71 6409, 71903, 2523155, C04B 3300, C09K 1700
Patent
active
056041683
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clay-containing mixture capable of forming a moisture resistant gel, which comprises a powdered or ground smectite and/or a smectite-containing natural rock and 1-10% by weight, calculated for the smectite content, of a water-soluble polymer. Such a mixture may also comprise a diluting agent; this diluted version is termed in the specification as a blend.
A clay-containing mixture and the use thereof in gel formation is known from EP-A-0 335 653. According to this reference a mixture comprising a clay mineral and at least 0.6% by weight of a water soluble polymer is intensely stirred or kneaded in the presence of water to effect reaction between the clay mineral and the polymer. In this way a suspension of a clay mineral/polymer complex forms which is, optionally after a drying step, reacted with at least 0.5% by weight of an activating agent again under intense stirring or kneading in the presence of water. This latter reaction provices a gel capable of taking up and releasing water in a reversible manner. Thus the mixture of clay mineral and water soluble polymer, either with or without water as diluent, is in fact a premixture for gel formation, for which the final gel is obtained in two chemical reactions performed in the presence of water under intense mechanical operations, applying a separately added activating agent as reactant in the second reaction.
The object according to the invention is to improve the method for the preparation of the gel-forming composition to be used in practice, so that the way of handling the mixture of the starting materials is easier, the devices to be used are simpler and the total process is less energy consuming.
The objects are met with a clay-containing mixture or blend according to the invention and is characterized in that both the mixture and the blend are dry solids, the blend comprises as diluting agent more than 0,5% by weight of one or more solid inert filler(s) with an average particle size higher than 0.05 mm, and both the mixture and the blend additionally comprise 0.8-6.0% by weight of a powdered solid activating agent, all the weight percentages being calculated for the smectite present.
According to the invention the blend preferably contains 1-95% by weight based on the weight of the blend, of the solid inert filler, which filler preferably has a particle size of 0.1-8.0 mm. This filler can be selected from sand, silicates, a ground rock or mineral, a ground fired ceramic or mixture thereof. It also is possible to use as the filler a ground waste from building industry.
Both the mixture and the blend according to the invention are dry solids, i.e. free water, being indispensable for any chemical reaction, is absent. When they contact water they spotaneously convert to moisture resistant gels. The term "moisture resistant" as used in the specification means that the gel resists the attacking and aggressive effects of any liquid from its environment, such as rain, water of natural sources, industrial and household waste water and sewages. Characteristic examples of such liquids are those composed primarily of water, which may also contain small amounts of dissolved foreign substances of either mineral or organic origin.
Both the mixture and its diluted version (the blend) can be used in practice for moisture insulation purposes by applying them on a surface or in a hole to be rendered watertightly insulated. When a small area is to be treated or a thin insulating layer is to be formed the mixture may be used as such, whereas for larger areas or thicker layers, such as for sealing a depony, it is much more expedient to use the blend.
Although the known methods lead to the formation of high quality gels applicable with good results for insulation purposes, they have the common disadvantage that the gel should always be preformed by a rather cumbersome mechanical operation. This operation is sometimes difficult to keep in hand and is rather energy-intensive because it requires an intense kneading and a long drying. These disadvant
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Aannemingsbedrijf Van Der Biggelaar Limburg B.V.
Group Karl
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