Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From plant material of unknown constitution
Patent
1998-12-22
2000-12-26
Boykin, Terressa M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From plant material of unknown constitution
528 2, C08G 200
Patent
active
061661627
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a refractory material which essentially consists of a binder or a binder mixture, a filler or a filler mixture as well as a hardener.
Such a refractory material is known and is used, for example, as taphole material for blast furnaces. Here, those refractory materials which meet the ISO Standard 1109 or the ISO Standard 2246 are to be understood by the term "refractory material". The disadvantage of the known refractory materials is that tar or tar-containing materials are used as binder or admixture. Such a binder for the fillers adapted to the particular application of the refractory material has admittedly the advantageous property that the refractory material made with this is plastic and that the high content of carbon of the tar-containing binder brings about a good bonding of the fillers. However, the serious disadvantage of such binders is that the latter are carcinogenic and thus entail employee health-care problems as well as problems with the disposal.
The disadvantage of the known refractory materials is that tar or tar-containing materials are used as binder or admixture. Such a binder for the fillers adapted to the particular application of the refractory material has admittedly the advantageous property that the refractory material made with this is plastic and that the high content of carbon of the tar-containing binder brings about a good bonding of the fillers. However, the serious disadvantage of such binders is that the latter are carcinogenic and thus entail employee health-care problems as well as problems with the disposal.
In DE 37 02 935, for the reduction of the tar content of a refractory material intended for use as taphole material, a binder and plastifier is therefore proposed which consists of one or several interface-active products of the combination of alkyl oxides with substances from the group of fatty alcohols, fatty acids, fatty acid polyolesters, resin acids, resin alcohols and/or natural resins and their products such as shellac, balsams, oils of turpentine or rosin. In this case, it is preferred that the interface-active compound from the group of the alkyl oxide substituted products with fatty alcohol, fatty acid polyolester is in the range of 0.1 to 5 parts by weight and the parts of alkyl oxide combination products with natural resin and its products is approximately 0.1 to 25 parts by weight.
By means of this binder, according to the particulars of the above-mentioned publication, the tar content in taphole materials which usually is in the order of magnitude of 15% and more is in this way to be reduced to less than 5%. A carbon-containing, ceramic refractory material, which uses the binder and plastifier described in the above-mentioned publication, has therefore still a tar content which is not to be disregarded so that also this refractory material has the serious disadvantage that the therein contained tar contains numerous aromatic, heterocyclic and condensed organic cyclic compounds which are known to be toxic and carcinogenic. These compounds are released during the processing and use, and lead, as the corresponding statutory regulations also show, to risks to the health of the employees and the environments.
Another disadvantage of the known binder and plastifier for a refractory, carbon-containing, anhydrous, ceramic material consists in that the known refractory material only has a low cold compression strength. Low cold compression strengths are in an unfavourable way usually not adequate for modern blast furnaces.
In DE 37 21 642, a binder and plastifier for carbon-containing, ceramic refractory materials is likewise described which is supposed to bring about a reduction of the noxious components and emissions which result from tar and the conventional tar substitutes. The binder and plastifier, suitable only for a refractory material using carbon black and/or graphite in the smallest distribution form with particle sizes of less than 150 .mu.m, contains in addition to the carbon black and/or graphite, interface-active products
REFERENCES:
Indian Foundry Journal, Bd. 21, Nr. 6, (1975) D.N. Bhatia et al.
Ballewski Thomas
Grossman Manfred
Heine Norbert
Boykin Terressa M.
Perstorp AB
Thyssen Krupp Stahl GmbH
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