US 4,307,980 AGranted

Process for consolidating and sealing off geological and artificially deposited rock and earth formations

AssigneesBergwerksverband GmbH, Bayer Aktiengesellschaft

InventorsFrank Meyer, Hans Mehesch, Rolf Kubens, Martin Winkelmann

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Abstract

Waterglass solutions are mixed with polyisocyanates and these emulsions are then left to harden in the formations. Introduction of the mixture into the formations which are required to be consolidated, e.g. deposits of coal, is mainly carried out by forcing the mixture under pressure into bore-holes in the formations. According to one variation of the process, the components of the mixture are introduced into the multi-chamber cartridges which are introduced into the bore-holes and then destroyed as the components are mixed. Certain additives such as accelerators, blowing agents, polyols, stabilizers and/or thixotropic agents are advantageous for the quality of the composite masses formed by hardening of the mixture.

Claims18

Dependent claims

A process for consolidating geological rock formations and coal deposits which comprises

(a) intimately mixing
(i) a waterglass solution,
(ii) a polyisocyanate which does not contain chemically incorporated emulsifiers selected from the group consisting of 2,4-diisocyanatotoluene;
2,6-diisocyanatotoluene;
mixtures of these isomers;
a polyphenyl-polymethylene polyisocyanate which corresponds to the phosgenation products of the aniline/formaldehyde condensation reaction;
and reaction products of said phosgenation products with polyhydric alcohols which have molecular weights ranging from about 62 to 3,000 wherein the NCO/OH molar ratio is about 1:0.005 to 1:0.3, and
(iii) up to about 30% by weight based on the weight of the waterglass solution of a compound having at least one polyisocyanate reactive group and which does not contain chemically incorporated emulsifiers,
wherein the proportion by weight of component (ii) to component (i) is in the range of about 75:25 to about 15:85, and
(b) introducing said mixture into said formation or said deposit which is required to be consolidated and allowing it to react to form a foamed, hardened composition which adheres to the surfaces of said formation or said deposit.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/127,019Filed 4 Mar 1980
Priority: DE 29087466 Mar 1979
Granted: 29 Dec 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

E21D 9/002
Improving soil or rock, e.g. by freezing; Injections: injection methods characterised by the chemical composition used
C08G 18/302
Low-molecular-weight compounds: water
C08G 18/3895
Containing silicon: inorganic compounds, e.g. aqueous alkalimetalsilicate solutions; Organic derivatives thereof containing no direct…
C09K 8/5086
Macromolecular compounds: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds