FI57820C - MASS FOR ROLLER CRUSHERS FOR CONTAINER CONDITIONING - Google Patents

Description

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Patent and ocean registration Araoican utitgd och uti. * Krfft * n puMicurad 30.06.80 (32) (33) (31) Requested prefix * —Bojirtl prtoritet 28.08.69 "Federal Republic of Germany

Tyskland (DE) P 191 * 363 ^ .1 „(71) (72) Erich Hoellfritsch, Rainwiesenveg 21, Behringersdorf bei Niirnberg,

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7¾) Antti Impola (5 * 0 Mass for continuously countable permutations -

(62) The present invention relates to a pulp for continuously countable permantas and a pulp formed by a slurry of water slurry. and a substance that retards the settling of solids in the sludge.

Such a mass containing gypsum fired as a calcium sulphate binder, sand to 25% by weight and water to 50% by weight of the binder, as well as various other substances, each of which slows down the settling of solids, are described in PR-137074-7. · It states that the mass according to the publication would have sufficient fluidity for the mass to settle on its own under the influence of gravity in the horizontal plane. However, tests performed in accordance with the patent publication have shown that this is not the case.

Until now, a technique has long been used in the calculation of pulp permantoes, in which the dough-like moistened permant pulp is applied to the substrate, compacted, the excess removed and smoothed (cf. e.g. Schfttze Bauverlag GmbH. Wiesbaden, Berlin, 1965 "Der Schwimmende Estrich", 5 · Auflage, pages 73 ... 85). For higher quality requirements, the surface still needs to be leveled. All of these operations require manual labor, which makes all known methods of making pulp permanto relatively inexpensive and still leaves much to be desired in terms of quality.

The object of the present invention is to provide an improvement in the mass known from patent publication ΪΈ-1370747, which spreads on the substrate like a liquid, whereby its upper surface is placed in a horizontal plane by gravity, where it also remains as it hardens.

In order to carry out the invention, the anhydrite binder and up to 100% by weight of Mecca of the amount of anhydrite in the binder and the wetting agent and the flow improver are slurried in water, the weight ratio of water to anhydrite binder being between 0.18 and 0.35. These ingredients provide such a permaloma mass that, when cast on the α-substrate, it self-settles horizontally and hardens while maintaining the upper surface achieved in this position.

The pulp having the composition according to the invention can thus be applied with much less work and thus considerably at a lower cost than the pulps known from the prior art. With the mass according to the invention, floors of several hundred square meters can be manufactured so accurately in a horizontal plane that it is not possible to detect an error with the help of meters present in practice. The curing of the mass according to the invention also begins with such a suitable delay that the casting of even large floor surfaces with the mass can be completed before the curing begins.

Anhydrite binders have been widely used in the manufacture of floor coverings or pulp permants. Such a binder consists of anhydrous calcium sulphate, anhydrite and a substance which hardens its hardening, in particular its hydration, which are commonly referred to as M accelerators ". (synthetic anhydrite) The properties of the anhydrite used to prepare the anhydrite binder and the accelerator added to it are described in detail in German standards DIN 4208 and in Ullmann's book "Enzyklopädie der technischen Chemie, Band 8 (1957)" on pages 107 and 117. in water, eg lime or calcium sulphate in small amounts (suitably 0.5 ...

2% by weight based on the anhydrite binder).

20-30% by weight of water, based on the anhydrite binder, has been sufficient for the production of high-strength inherited pulps, but the anhydrite manufacturers' 5 57820 phje had to be strictly observed to avoid defects in the mains (cf. Ullmanns Enzyklo-oralie der technischen Chemie, Band 8/1957 / s. 118, lines 12 ... 15) ·

Thus, the anhydrite binder package also always had to be provided with instructions for use (cf. DIN standard 4208 / October 1962). According to it, the anhydrous binder had to be mixed with sand in a volume ratio of 1: 2.5 (equivalent to a weight ratio of about 1: 3 * 75) as soil moisture. In order to increase the strength of such a pulp, a resin has also been used, which, however, has caused processing difficulties and cumbersome manual work in application, which has been completely avoided with the pulp having the composition according to the invention.

Due to the low solids content of the pulp prepared according to the invention and the addition of its flow improver, a water / binder ratio of 0.3 'or less (0.18) may be sufficient to achieve the required flowability according to the invention. The flowability can be improved, for example, by the addition of water-soluble cellulose ethers (methylcellulose, carboxymethylcellulose), which are known to be used as suspending agents for a wide variety of purposes. Particularly suitable for use according to the invention are those cellulose ethers having a viscosity in the range from 20 to 8,000 cP, in particular in the range from 200 to 2,000 cP as a 2% aqueous solution. Such cellulose derivatives have already been used in mortars, but not for a purpose comparable to the invention. The amounts of one or more settling retardants used depend on the desired flow rate and thus also on the length of the drains. This additional amount is usually 0.01 to 5% by weight based on the anhydrite binder.

Flowability has been added to the pulp according to the invention to further improve wetting or surfactants and suitably also an anti-foaming agent. Naphthalenesulfonic acid-formaldehyde condensation products have proven to be particularly advantageous as wetting agents. Particularly good results were obtained with additions of about 0.1% by weight of anhydrite binder. The wetting agent additive according to the invention also slows down the settling of solids in the slurry.

By adding a defoamer to the mass, a common, smooth surface of the coating can be ensured. Defoamers are known in the literature, so they do not need to be discussed in detail here. See. from "Chemielexikon Römpp", published by der Franckhsche Verlagshandlung Stuttgart. This also applies to the amounts of antifoams used.