Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1994-08-02
1998-09-08
Marcantoni, Paul
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
501 12, 25231501, 106600, 106819, C01B 3312
Patent
active
058041540
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of mineral materials and more particularly to compositions based on fillers, sol oxides, polysilicates and, optionally, pigmenting agents and their method of production.
BACKGROUND OF THE INVENTION
Numerous materials with which specific problems could be solved are known from colloid chemistry, particularly sol-gel technology. Colloids are usually defined as disperse systems with at least one characteristic dimension in the range of about 10.sup.-7 to 10.sup.-4 centimeters. Sols are dispersions of any solid in a liquid. Gels, are systems, such as common jelly, in which one component provides a sufficient structural framework for rigidity and other components from the space between the structural units or spaces. In a gel, the dispersed component and the dispersion medium both extend continuously throughout the system. The system has equilibrium-elastic (time-dependent) deformation and thus the shear modulus of rigidity enables gels to act like solids even though in most other physical respects they behave like liquids. Therefore, it is possible to produce from liquid components a solid, crosslinked material.
Whereas as in the case of conventional dispersions, a sol, e.g. the disperse phase, is relatively freely movable, this is no longer the case in a gel, where the particles are interconnected in net-like manner and are therefore difficult to displace relative to one another. Thus, the essence of sol-gel technology is the transition between free disperse and crosslinked dispersed phase. As a rule the transition from sol to gel in materials is irreversible, the dispersed, solid constituent being distributed in net or honeycomb-like manner in the dispersant, usually water, the dispersant being expelled by means of heat, in order to give a solid crosslinked material.
What is problematical is the finalization of the gel to the material, i.e. the expulsion of the dispersant. It would be desirable to obviate this procedure, i.e. to essentially incorporate the dispersant into the material. Advantageously this should take place without additional process stages and certainly not by means of energy-intensive stages such as burning out, baking, etc.
SUMMARY OF THE INVENTION
The presently described process for the production of inorganic modified oxides by which hard and solid, crosslinked, layer-like, transparent or crystalline multicomponent semifinished products or materials can be produced at low temperature such as e.g. ambient temperature, constitutes a further, enrichment of the prior art in this field.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention defined in the claims shows how it is possible to arrive at semifinished products further processable to such materials. This leads to universally usable, inorganic materials, which can be produced in large quantities.
The fundamental idea is based on the fact that the object is not merely the crosslinking of the solid disperse phase in the dispersant, but also the use of the solid disperse phase as an overmatrix, in order to incorporate macroparticles into the same, the dispersant in the material being finally chemically bound, but sufficient binding agent is added in excess that with a subsequent dispersant addition the preliminary product can be finalized to the desired material. This leads to a storable, but still reactive semifinished product which, mixed with the dispersant (generally water) and finally reacted leads to the end product.
For this purpose a matrix-like substance of filler-like macro-particles and sol oxide, polysilicate (crosslinking materials) and a buffer for assisting the formation of the overmatrix are brought together and processed. In a further embodiment of the present invention, this substance is pigmentable, thus allowing a considerable variety of characteristics to be attained. This is brought about by introducing a variation mixture into the substance. The varied substance directed at the sought objective is transformed in two following process stage
REFERENCES:
patent: 4097422 (1978-06-01), Markusch
patent: 4948765 (1990-08-01), Snook
patent: 5132355 (1992-07-01), Nahlovsky
patent: 5571319 (1996-11-01), Berke et al.
Zement Taschenbuch, Verein Deutscher Zementwerke, pp. 56-57 and 250-251 (1979) (No month available).
Farley Walter C.
Marcantoni Paul
Orzechowski Karen Lee
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