CA1074092A - Process for the consolidation of geological formations - Google Patents
Process for the consolidation of geological formationsInfo
- Publication number
- CA1074092A CA1074092A CA231,860A CA231860A CA1074092A CA 1074092 A CA1074092 A CA 1074092A CA 231860 A CA231860 A CA 231860A CA 1074092 A CA1074092 A CA 1074092A
- Authority
- CA
- Canada
- Prior art keywords
- polyol
- polyisocyanate
- reactive
- consolidated
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/30—Polyisocyanates; Polyurethanes
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Abstract of the Disclosure This invention concerns a method of consolidating geological formations by applying a polyurethane reaction system to the material to be consolidated. The reaction system comprises a polyisocyanate component and a polyol component wherein the polyol component contains about 5 to 50 wt. %
of a special polyether with an OH number under about 100.
This polyether is produced by the reaction of a compound having more than one reactive hydrogen atom per molecule and a molecular excess of a 1,2-alkylene oxide. The reaction sys-tem can also contain conventional polyurethane additives such as foaming agents, fillers, foam stabilizers and catalysts.
In a preferred embodiment, the special polyether is produced from ethylene diamine or triethanol amine.
of a special polyether with an OH number under about 100.
This polyether is produced by the reaction of a compound having more than one reactive hydrogen atom per molecule and a molecular excess of a 1,2-alkylene oxide. The reaction sys-tem can also contain conventional polyurethane additives such as foaming agents, fillers, foam stabilizers and catalysts.
In a preferred embodiment, the special polyether is produced from ethylene diamine or triethanol amine.
Description
Mb-1533-Ca LeA 16,016-Ca ~74092 PROCESS FOR THE CONSOLIDATION OF GEOLOGICAL FORMATIONS
Background of the Invention German Patent Specification 1,129,894 describes a process for sealing or consolidating geological formations against water or gas by means of polyurethane, wherein reaction components, forming a cross-linked product with the group -NH-CO-O-, namely a di- or polyisocyanate and a polyol com-prising at least three reactive OH groups, mixed together in a liquid vehicle, are forced under pressure into the formation to be sealed or consolidated.
In forming the polyurethane, polyols are usually used having an average molecular weight of 400-600 and an OH number of 350-400. These polyols may be replaced up to about 15 or even completely by a plasticizer, in particular castor oil. Despite many disadvantageous properties, castor oil is used in practice as a sole or partial cross-linking agent for isocyanates for consolidating geological formations, see for example "Gluckauf" 104 (1968) Volume 15, pages 666-670, German Patent Specification DOS 2,123,271,DBP 1,758,185, and DBP 1,784,458.
One disadvantage of high castor oil contents is the insufficient flexibility which it gives to the hardening polyurethane, which may lead to a premature destruction of the consolidated state of the geological formation, especially with the high dynamic stress on coal and the surrounding rock occurring in mechanical coal production processes in open-cast mining. As the proportion of castor oil in the polyol com-ponent is raised, the modulus of elasticity, the compression strength and the bending strength of the polyurethane which :
brings about the consolidation of the geological formation are LeA 16,016-Ca .. . . . , , , , .: . .
.: .
~07~09Z
reduced, so that the rock pressure and the action of external forces connected with the mechanical production process may cause slip of the consolidated formations.
A further disadvantage is the relatively high vis-cosity of castor oil, which is approximately 100 mPa s at 25C. With higher contents of castor oil in the polyol component, the viscosity of the entire system is raised to such a value that troublefree penetration into the smallest cracks and crevices and the complete wetting of the surface are no longer guaranteed.
The immiscibility of castor oil with water is also a disadvantage. If damp or wet rock is to be consolidated, the castor oil may be separated from the system by the water absorption of the polyol compounds, which are very miscible with water, and thus the castor oil no longer reaches the diisocyanate for reaction. Indeed, a known method for de-termining castor oil in polyol compounds consists of separating the castor oil by displacement with water.
Another disadvantage is that the castor oil reduces the binding force between the polyurethane and the rock or coal at high castor oil contents in the polyol. Thus, the structure of the consolidated formations is weakened.
Summary of the Invention It has now been discovered that the aforementioned disadvantages may be eliminated in consolidating geological formationsby employing a process comprising applying an at least two-component reactive polyisocyanate/polyol mixture to the material to be consolidated wherein said reactive polyisocyanate/
polyol mixture comprises:
LeA 16,016-Ca - 2 -~`~.' .. ~ . '~ '. :
. , . . , ~ ~ .
, , .~ . .
, ' ' ,: ' ' ~ ' ~7~092 (a) a polyisocyanate, and (b) a polyol mixture comprising (i) 5-50% by weight of a polyether polyol having an OH number under 100 produced by the reaction between a compound having more than one reactive hydrogen atom per molecule and a molar excess of 1,2-alkylene oxide, and (ii) 95-50% by weight of a polyol selected from the group consisting of a poly-hydroxyalkane having 2 to 4 hydroxy groups with a molecular weight of about 62 to 200 and a polyether polyol having an OH number of about 200 to 1056 with a molecular weight of about 106 to 1,000, and wherein said reactive polyisocyanate/polyol mixture undergoes an isocyanate polyaddition reaction in the material to be consolidated.
In a preferred embodiment, the geological formations that may be consolidated by the process of the present in-vention are geological formations encountered in coal mining.
Another embodiment of the invention pertains to a fracturable double chamber cartridge in which one chamber contains the polyisocyanate component noted above and the second chamber contains the polyol mixture noted above.
The polyurethanes produced from such polyol mixtures and which bring about the consolidation of geological forma-tions have high flexibility with a high modulus of elasticity ~ -3-LeA 16,016-Ca -~
~7409Z
and a high bending strength, have a high binding force to coal and surrounding rock, and resist strong dynamic stresses.
It is also easily possible to keep the composition of the said product of reaction constant by holding the reaction conditions constant during its production.
A further advantage of such a polyol mixture is its good compatibility with water, so that separation of the flexibility-conferring component on consolidation of wet or damp formations is impossible.
The polyether preferably has an average molecular weight of about 1500-8000 most preferably of about 2000-3500 and as stated, an OH number under 100, and preferably between 50 and 90.
Constituents with more than one reactive hydrogen atom per molecule for producing suitable polyethers include primarily carboxylic acids, phenols, alcohols and amines.
Examples of carboxylic acids are: phthalic acid, adipic acid, maleic acid, succinic acid.
Examples of phenols are: hydroquinone, pyro-catechin, 4,4'-dihydroxydiphenyl-dimethylmethane.
Examples of alcohols are: ethylene glycol, propylene glycol, trimethylol propane, glycerin, pentaerythritol, mannitol, glucose, fructose and sucrose.
-3a-LeA 16,016-Ca ~ `
~.,, Examples of amines are: ammonia, mono- and di-ethanolamine, diethylenetriamine, aniline, diaminodiphenyl-methane, and especially ethylenediamine and triethanolamine.
Examples of 1,2-alkylene oxides are: ethylene oxide, propylene oxide and 1,2-butylene oxide. Mixtures may be used, or one alkylene oxide may be used in the first reaction stage and another in the second reaction stage, in order to bring about segmentation in the synthesis of the polyether molecule.
The production of the polyether is in accordance with known reactions, see for example Ullmann, No. 14, pages 50-51, 3rd edition 1963 and Polyurethanes: Chemistry and Technology, Volume 1 , pages 33-43 by Saunders and Frisch Interscience (1962). The amount of 1,2-alkylene oxide to be used is set by the requirement of reaching an OH number under 100.
The preferred embodiment of the process according to the invention is the use, in the proportion of 5-50% by weight, of those reaction products obtainable from amines and 1,2-alkylene oxides. The described advantages in comparison with castor oil relative to the mechanical properties of the consolidation of the geological formations and heaped rock and earth masses are particularly evident in this case. This result is surprising, particularly in the light of the generally held opinion that polyols containing amine, because of their too rapid reaction with isocyanates, would not be able to accomplish the time consuming impregnation processes concerned in penetrating fine crevices and fissures of the formations to be consolidated, which represents a physical prerequisite for the chemical consolidation itself.
Most remarkable is the fact that the described polyol LeA 16,016 -4-. - . :
.
::
. .
.. .. ... . : .
mixtures have practically the same pot ]ife time as conventional polyols when mixed with isocyanates, an~ may thus be used for all presently known consolidation methods. The isocyanates used may be any known products which comprise more than one isocyanate group per molecule. Examples are: toluylene-diisocyanate, prepolymers with free isocyanate groups formed from multivalent alcohols and toluylenediisocyanate, hexa-methylenediisocyanate and its prepolymers, diphenylmethane-diisocyanate and mixtures of its various isomers and higher nucleus fractions. Included are the isocyanates and isocyanate terminated prepolymers described in Polyurethanes: Chemistry and Technology by Saunders and Frisch, Interscien~e (1962) which have more than one NCo group per molecule. The preferred polyisocyanates are the well-known polyisocyanate mixtures which are obtained by phosgenation of aniline - formaldehyde condensates.
The polyols which according to the invention are added to the said ethers may be any polyols known in polyurethane production, such as those described in Polyurethanes pages 32-61, above re-ferenced. Preferred polyols are a) polyhydroxyalkanes having from 2 to 4 hydroxy g~oups per molecule, molecular weights of about 62 to about 200 such as e.g. ethyleneglycol,1,2_prOpane diol, hexamethyleneglycol, trimethylolpropane, glycerol or pentaerythrithol and/or b)~pol~ ther polyols with molecular weights of about 106 to 1000 preferably of about 250 to 700 most ~re-ferably of about 400 to 600 and OH-numbers of about 200 to 1056 preferably of about 250 to 800 and most preferably of about 350 to 400. Any mixtures of components of a) and b) may be used. The preferred polyols are the~pol~ether polyols mentioned under b). Suchtpol~etber polyols are produced for example by reacting trimethylolpropane with propylene oxide (hereinafter Le A 16 016 _ 5 _ called polyol l) or a mixture of sucrose and 1,2-propane-diol with propylene oxide thereinafter called polyol 6).
Further specific examples for suchtpol~ether polyols are e-g-diethylene glycol,triethylene gly~ol, tetraethylene glycol, di~ropylene glycol, tripropylene glycol, ethoxylation and1or propoxylation products of low molecular weight polyhydroxy-compounds such as e.g. those mentioned hereinbefore under a).
The proportion of the polyol component to be mixed with the isocyanate may be varied within wide limits, but advantageously so much isocyanate is added that 0.5-2 NCO
groups are present for each OH group. If the geological formations or the heaped rock and earth masses to be consoli-dated contain much moisture, it is desirable to use a large excess of isocyanate.
Moreover it is possible to use the usual blending agents known in polyurethane chemistry for modifying the con-tained polyurethanes, e.g. castor oil, expanding agents such as water and fluorinated hydrocarbons, accelerators such as tertiary amines and metal catalysts (e.g. stannic chloride tin-(II)-octoate or dibutyl-tin-dilaurate ) and foam regu-lators such as organic silicon compounds. Fillers may also be incorporated SUCh as the fly ash described in German Auslegeschrift 1 159 865.
It is further possible to add hydrophylic substances, such as sodium aluminosilicate of the Zeolite type, if it is required to prevent foaming of the consolidating medium.
The advantages of the process according to the invention will be illustrated by the following examples:
Le A 16 016 - 6 -- . ~ , ~C~7409Z
In the specified examples, the following substances have the meanings given:
Polyol l: a polyether polyol, produced from trimethylol propane and propylene oxide, with an OH number of 370, an average molecular weight of 450 and a viscosity of 700 mPa at 25C.
oil a commercially available natural product of 1st pressing quality, with an OH number of 148 and a viscosity of about l000 mPa s at 25C.
10 Polvol 2: a polyether polyol, produced from trimethylol propane and propylene oxide, with an OH number of 56 an average molecular weight of about 3000 and a viscosity of 550 mPa s at 25C.
Po]vol 3: a polyether polyol, produced from l,2-propyle~e glycol and propylene oxide, with an OH number of 59, an average molecular weightof 2500 and a viscosity of 410 mPa s at 25C.
Polyol 4: a polyether polyol, produced from ethylene diamine and propylene oxide, with an OH number of 61, an average molecular weight of 3500 and a viscosity of 630 mPa s at 25C.
Polyol 5: a polyether polyol, produced from triethanol-amine and propylene oxide until an OH number of 103 is reached, followed by reaction with ethylene oxide until an OH number of 58 is reached, with and average molecular weight of 3200 and a vis-cosity of 480 mPa s at 25C.
Le A 16 016 - 7 -~07409Z
Polvol 6: a polyether polyol, produced from a mixture of sucrose and l,2-propanediol in the molecular proportion of l:5 plus propylene oxide, with an OH number of 380, an average molecular weight of 440 and a viscosity of 580 mPa s at 25C.
100 parts by volume of the polyols and polyol mixtures given in the following Table l were mixed with an isocyanate component with an isocyanate content of 31~ and a viscosity of 140 mPa s at 25C, obtained by phosgenating a formaldehyde-aniline condensation product and comprising more -than 50~ of 4,4-diisocyanate diphenyl methane and with 5 parts by weight of a sodium aluminosilicate of Zeolite type, and cast in metal molds treated with a release agent. After 15 hours of hardening at room temperature, the molds were tempered with hardening completed for 5 hours at 80C. The properties given in columns 1-3 of Table 1 were determined for the compact unfoamed polyurethane specimens obtained.
To estimate the binding properties with coal and adjacent rock, clay slate and coalprismsof size 4 x 4 x 16 cm were broken and the reaction mixture was cast into them, keeping a constant separation gap of 2 mm. The bending strength of the cemented prisms was then determined and used as a measure of the binding properties. ``
Le A 16 016 - 8 -- , ~ . ~ ' ,; ' ' ' lQ74~9Z
910 ' 91 ~I
o oo oo co O o ~ a~
~ u~ 1~ LO O O ~r ,~
~o co a~ er ~1 1~ ~ ~o ~ o o o o ~ o o o ~ a o~
~: O O O O O O O O
~ ~ ~ U~ ~ I~ O ~ ~
I_ ~r ~D ~ I` ~ ~r ;g~a u~ O u~ u~ ~ ~ ~ 03 ~ cq . . . . . . .
~ ~ ~ ~ ~ ~ r~ ~ ~
~i a-- ,~
O-_, U~
~D I- CO OD _l ~ In ~l~ ~ ~ ~ ~ ~ ~
r~
1~ l~i~ ~ ~L~ ~
g ~ 8 ~ o ~ o ~ o ~ ~ o a a ~+ ~+ ~+ ~+ a .,, .~ . .~
.-.
1074~9Z
100 parts by volume of each of the polyol mixturesgiven in Table 2 were treated as in Example 1. The designation of the polyols agrees with that of Example 1. The properties given in Table 2 were measured.
Polyol ~ing strength Modulus of Elas~ ing pro- MPa MPa DIN 53 452 ticity~a DIN perties on on rock (equivalent to 7735 coal ASTM D 790) 100 parts by wt.l + 10 parts by wt.4 68 2740 1.04 2.72 100 parts by wt.l + 15 parts by wt.4 90 2750 1.16 2.84 100 parts by wt.l + 20 parts by wt.4 115 2770 1.21 3.00 100 parts by wt.l + 30 parts by wt.4 85 2730 1.20 ' 3.02 EXA~LE 3 100 parts by volume of each of the polyol mixtures given in Table 3, with the same designation as Example 1, were mixed with 1.2 parts by volume of water and 0.6 parts by volume of a polysiloxane for foam stabilization. 100 parts by volume of the isocyanate described in Example 1 were then added to each and agitated for 30 seconds. Foam development in the liquid began in each case after 4 minutes, with solidification of the induced foam after about 15 minutes.
The properties given in Table 3 were determined for the obtained foams.
LeA 16,016 -10-- ' ' ' ' :
1074~)92 910 ' 91 ~q ~ ~ ~ ~9 ~ ~o o o o ,Y~ CO
D a O _, ~13N^ ~1 ~1 1C~74~9Z
The polyurethane reaction system may be applied to the material to be consolidated in a variety of ways. The reaction system may be poured into downwards filled drill holes which are then sealed. In such cases, it is advantageous to employ a blowing agent such as water in the reaction system.
This process is described in greater detail in German Aus-legeschrift No. 1,758,185 or French Patent No. 2,006,536.
Alternatively, the system can be applied by means of a two-compartment cartridge which maintains the isocyanate and polyol components in separate compartments. A bore hole is drilled and one or more cartridges are inserted into the hole. The cartridges are then fractured in such a way as to intimately blend the two components, and the bore hole is sealed. The reaction system in this application should con-tain a blowing agent. This method is described in greater detail in U. S. Patent No. 3,698,196.
In addition the reaction system may be injected under pressure into the material to be consolidated. The injection may be performed by machine with a working pressure of about 60 bar as is described in Gluckauf, 108, ~uly 20, 1972, pages 615-618. As discussed therein, it is disadvan-tageous to work at pressures greater than about 90 bar because of the likelihood of expanding cracks and fissures already present in the material to be consolidated. The machine may be equipped with a two component pump which draws each of the components separately so that they may be mixed immediately in front of or in the hole to which the system is to be supplied. Iron or wooden poles may be inserted into the injection hole prior to injection of the system. This would strengthen the consolidated mass and reduce the amount of .
LeA 16,016-Ca - 12 -~ ' ` ' ' ~ ' . ' ' 1074~92 system components consumed.
The injection may also be effected by placing each of the system components under pressure in separate containers and then supplying them from these containers to the material to be consolidated, for instance, pipes with one way valves may be provided from each container to a T joint at which the components are mixed and at which additional gas may be provided to insure a more thorough mixing of the components.
This method is described in more detail in German Offen-legungsschrift No. 2,123,271.
Normally, in the pouring and injection embodimentsthe reactive system includes a foaming agent. However, in certain circumstances, it may be advantageous to employ the system without such an agent so that a solid resin is formed.
In such a case it is desirable to add a hydrophilic substance, such as Zeolite type sodium alumino-silicate, as discussed hereinabove. This additive will absorb water from both the polyol component (water is quite miscible with most polyethers) and thP environment to which the system is applied thus pre-venting substantial foaming from occurring. The solid resinsystems offer greater strength for those special applications wherein it is required.
A number of specific sequences for applying the reactïonsystem of the present invention to the material to be consolidated will occur to those skilled in the art. The particular embodiments of the present invention are therefore not limited to those described above but rather the scope of the invention is defined by the claims and descriptions of particular embodiments are merely exemplary.
LeA 16,016-Ca - 13 -`A
.
.'.. - . :. :
From the preceding examples and Tables, it is evident that the binding force on coal and rock of the polyurethanes according to the invention is considerably improved with relation to the binding force usual with polyurethanes made flexible with castor oil. The bending strength, deflection and modulus of elasticity are considerably more favorable for consolidating coal and rock.
Although the invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention except as it may be limited by the claims.
LeA 16,016 -14-,
Background of the Invention German Patent Specification 1,129,894 describes a process for sealing or consolidating geological formations against water or gas by means of polyurethane, wherein reaction components, forming a cross-linked product with the group -NH-CO-O-, namely a di- or polyisocyanate and a polyol com-prising at least three reactive OH groups, mixed together in a liquid vehicle, are forced under pressure into the formation to be sealed or consolidated.
In forming the polyurethane, polyols are usually used having an average molecular weight of 400-600 and an OH number of 350-400. These polyols may be replaced up to about 15 or even completely by a plasticizer, in particular castor oil. Despite many disadvantageous properties, castor oil is used in practice as a sole or partial cross-linking agent for isocyanates for consolidating geological formations, see for example "Gluckauf" 104 (1968) Volume 15, pages 666-670, German Patent Specification DOS 2,123,271,DBP 1,758,185, and DBP 1,784,458.
One disadvantage of high castor oil contents is the insufficient flexibility which it gives to the hardening polyurethane, which may lead to a premature destruction of the consolidated state of the geological formation, especially with the high dynamic stress on coal and the surrounding rock occurring in mechanical coal production processes in open-cast mining. As the proportion of castor oil in the polyol com-ponent is raised, the modulus of elasticity, the compression strength and the bending strength of the polyurethane which :
brings about the consolidation of the geological formation are LeA 16,016-Ca .. . . . , , , , .: . .
.: .
~07~09Z
reduced, so that the rock pressure and the action of external forces connected with the mechanical production process may cause slip of the consolidated formations.
A further disadvantage is the relatively high vis-cosity of castor oil, which is approximately 100 mPa s at 25C. With higher contents of castor oil in the polyol component, the viscosity of the entire system is raised to such a value that troublefree penetration into the smallest cracks and crevices and the complete wetting of the surface are no longer guaranteed.
The immiscibility of castor oil with water is also a disadvantage. If damp or wet rock is to be consolidated, the castor oil may be separated from the system by the water absorption of the polyol compounds, which are very miscible with water, and thus the castor oil no longer reaches the diisocyanate for reaction. Indeed, a known method for de-termining castor oil in polyol compounds consists of separating the castor oil by displacement with water.
Another disadvantage is that the castor oil reduces the binding force between the polyurethane and the rock or coal at high castor oil contents in the polyol. Thus, the structure of the consolidated formations is weakened.
Summary of the Invention It has now been discovered that the aforementioned disadvantages may be eliminated in consolidating geological formationsby employing a process comprising applying an at least two-component reactive polyisocyanate/polyol mixture to the material to be consolidated wherein said reactive polyisocyanate/
polyol mixture comprises:
LeA 16,016-Ca - 2 -~`~.' .. ~ . '~ '. :
. , . . , ~ ~ .
, , .~ . .
, ' ' ,: ' ' ~ ' ~7~092 (a) a polyisocyanate, and (b) a polyol mixture comprising (i) 5-50% by weight of a polyether polyol having an OH number under 100 produced by the reaction between a compound having more than one reactive hydrogen atom per molecule and a molar excess of 1,2-alkylene oxide, and (ii) 95-50% by weight of a polyol selected from the group consisting of a poly-hydroxyalkane having 2 to 4 hydroxy groups with a molecular weight of about 62 to 200 and a polyether polyol having an OH number of about 200 to 1056 with a molecular weight of about 106 to 1,000, and wherein said reactive polyisocyanate/polyol mixture undergoes an isocyanate polyaddition reaction in the material to be consolidated.
In a preferred embodiment, the geological formations that may be consolidated by the process of the present in-vention are geological formations encountered in coal mining.
Another embodiment of the invention pertains to a fracturable double chamber cartridge in which one chamber contains the polyisocyanate component noted above and the second chamber contains the polyol mixture noted above.
The polyurethanes produced from such polyol mixtures and which bring about the consolidation of geological forma-tions have high flexibility with a high modulus of elasticity ~ -3-LeA 16,016-Ca -~
~7409Z
and a high bending strength, have a high binding force to coal and surrounding rock, and resist strong dynamic stresses.
It is also easily possible to keep the composition of the said product of reaction constant by holding the reaction conditions constant during its production.
A further advantage of such a polyol mixture is its good compatibility with water, so that separation of the flexibility-conferring component on consolidation of wet or damp formations is impossible.
The polyether preferably has an average molecular weight of about 1500-8000 most preferably of about 2000-3500 and as stated, an OH number under 100, and preferably between 50 and 90.
Constituents with more than one reactive hydrogen atom per molecule for producing suitable polyethers include primarily carboxylic acids, phenols, alcohols and amines.
Examples of carboxylic acids are: phthalic acid, adipic acid, maleic acid, succinic acid.
Examples of phenols are: hydroquinone, pyro-catechin, 4,4'-dihydroxydiphenyl-dimethylmethane.
Examples of alcohols are: ethylene glycol, propylene glycol, trimethylol propane, glycerin, pentaerythritol, mannitol, glucose, fructose and sucrose.
-3a-LeA 16,016-Ca ~ `
~.,, Examples of amines are: ammonia, mono- and di-ethanolamine, diethylenetriamine, aniline, diaminodiphenyl-methane, and especially ethylenediamine and triethanolamine.
Examples of 1,2-alkylene oxides are: ethylene oxide, propylene oxide and 1,2-butylene oxide. Mixtures may be used, or one alkylene oxide may be used in the first reaction stage and another in the second reaction stage, in order to bring about segmentation in the synthesis of the polyether molecule.
The production of the polyether is in accordance with known reactions, see for example Ullmann, No. 14, pages 50-51, 3rd edition 1963 and Polyurethanes: Chemistry and Technology, Volume 1 , pages 33-43 by Saunders and Frisch Interscience (1962). The amount of 1,2-alkylene oxide to be used is set by the requirement of reaching an OH number under 100.
The preferred embodiment of the process according to the invention is the use, in the proportion of 5-50% by weight, of those reaction products obtainable from amines and 1,2-alkylene oxides. The described advantages in comparison with castor oil relative to the mechanical properties of the consolidation of the geological formations and heaped rock and earth masses are particularly evident in this case. This result is surprising, particularly in the light of the generally held opinion that polyols containing amine, because of their too rapid reaction with isocyanates, would not be able to accomplish the time consuming impregnation processes concerned in penetrating fine crevices and fissures of the formations to be consolidated, which represents a physical prerequisite for the chemical consolidation itself.
Most remarkable is the fact that the described polyol LeA 16,016 -4-. - . :
.
::
. .
.. .. ... . : .
mixtures have practically the same pot ]ife time as conventional polyols when mixed with isocyanates, an~ may thus be used for all presently known consolidation methods. The isocyanates used may be any known products which comprise more than one isocyanate group per molecule. Examples are: toluylene-diisocyanate, prepolymers with free isocyanate groups formed from multivalent alcohols and toluylenediisocyanate, hexa-methylenediisocyanate and its prepolymers, diphenylmethane-diisocyanate and mixtures of its various isomers and higher nucleus fractions. Included are the isocyanates and isocyanate terminated prepolymers described in Polyurethanes: Chemistry and Technology by Saunders and Frisch, Interscien~e (1962) which have more than one NCo group per molecule. The preferred polyisocyanates are the well-known polyisocyanate mixtures which are obtained by phosgenation of aniline - formaldehyde condensates.
The polyols which according to the invention are added to the said ethers may be any polyols known in polyurethane production, such as those described in Polyurethanes pages 32-61, above re-ferenced. Preferred polyols are a) polyhydroxyalkanes having from 2 to 4 hydroxy g~oups per molecule, molecular weights of about 62 to about 200 such as e.g. ethyleneglycol,1,2_prOpane diol, hexamethyleneglycol, trimethylolpropane, glycerol or pentaerythrithol and/or b)~pol~ ther polyols with molecular weights of about 106 to 1000 preferably of about 250 to 700 most ~re-ferably of about 400 to 600 and OH-numbers of about 200 to 1056 preferably of about 250 to 800 and most preferably of about 350 to 400. Any mixtures of components of a) and b) may be used. The preferred polyols are the~pol~ether polyols mentioned under b). Suchtpol~etber polyols are produced for example by reacting trimethylolpropane with propylene oxide (hereinafter Le A 16 016 _ 5 _ called polyol l) or a mixture of sucrose and 1,2-propane-diol with propylene oxide thereinafter called polyol 6).
Further specific examples for suchtpol~ether polyols are e-g-diethylene glycol,triethylene gly~ol, tetraethylene glycol, di~ropylene glycol, tripropylene glycol, ethoxylation and1or propoxylation products of low molecular weight polyhydroxy-compounds such as e.g. those mentioned hereinbefore under a).
The proportion of the polyol component to be mixed with the isocyanate may be varied within wide limits, but advantageously so much isocyanate is added that 0.5-2 NCO
groups are present for each OH group. If the geological formations or the heaped rock and earth masses to be consoli-dated contain much moisture, it is desirable to use a large excess of isocyanate.
Moreover it is possible to use the usual blending agents known in polyurethane chemistry for modifying the con-tained polyurethanes, e.g. castor oil, expanding agents such as water and fluorinated hydrocarbons, accelerators such as tertiary amines and metal catalysts (e.g. stannic chloride tin-(II)-octoate or dibutyl-tin-dilaurate ) and foam regu-lators such as organic silicon compounds. Fillers may also be incorporated SUCh as the fly ash described in German Auslegeschrift 1 159 865.
It is further possible to add hydrophylic substances, such as sodium aluminosilicate of the Zeolite type, if it is required to prevent foaming of the consolidating medium.
The advantages of the process according to the invention will be illustrated by the following examples:
Le A 16 016 - 6 -- . ~ , ~C~7409Z
In the specified examples, the following substances have the meanings given:
Polyol l: a polyether polyol, produced from trimethylol propane and propylene oxide, with an OH number of 370, an average molecular weight of 450 and a viscosity of 700 mPa at 25C.
oil a commercially available natural product of 1st pressing quality, with an OH number of 148 and a viscosity of about l000 mPa s at 25C.
10 Polvol 2: a polyether polyol, produced from trimethylol propane and propylene oxide, with an OH number of 56 an average molecular weight of about 3000 and a viscosity of 550 mPa s at 25C.
Po]vol 3: a polyether polyol, produced from l,2-propyle~e glycol and propylene oxide, with an OH number of 59, an average molecular weightof 2500 and a viscosity of 410 mPa s at 25C.
Polyol 4: a polyether polyol, produced from ethylene diamine and propylene oxide, with an OH number of 61, an average molecular weight of 3500 and a viscosity of 630 mPa s at 25C.
Polyol 5: a polyether polyol, produced from triethanol-amine and propylene oxide until an OH number of 103 is reached, followed by reaction with ethylene oxide until an OH number of 58 is reached, with and average molecular weight of 3200 and a vis-cosity of 480 mPa s at 25C.
Le A 16 016 - 7 -~07409Z
Polvol 6: a polyether polyol, produced from a mixture of sucrose and l,2-propanediol in the molecular proportion of l:5 plus propylene oxide, with an OH number of 380, an average molecular weight of 440 and a viscosity of 580 mPa s at 25C.
100 parts by volume of the polyols and polyol mixtures given in the following Table l were mixed with an isocyanate component with an isocyanate content of 31~ and a viscosity of 140 mPa s at 25C, obtained by phosgenating a formaldehyde-aniline condensation product and comprising more -than 50~ of 4,4-diisocyanate diphenyl methane and with 5 parts by weight of a sodium aluminosilicate of Zeolite type, and cast in metal molds treated with a release agent. After 15 hours of hardening at room temperature, the molds were tempered with hardening completed for 5 hours at 80C. The properties given in columns 1-3 of Table 1 were determined for the compact unfoamed polyurethane specimens obtained.
To estimate the binding properties with coal and adjacent rock, clay slate and coalprismsof size 4 x 4 x 16 cm were broken and the reaction mixture was cast into them, keeping a constant separation gap of 2 mm. The bending strength of the cemented prisms was then determined and used as a measure of the binding properties. ``
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~o co a~ er ~1 1~ ~ ~o ~ o o o o ~ o o o ~ a o~
~: O O O O O O O O
~ ~ ~ U~ ~ I~ O ~ ~
I_ ~r ~D ~ I` ~ ~r ;g~a u~ O u~ u~ ~ ~ ~ 03 ~ cq . . . . . . .
~ ~ ~ ~ ~ ~ r~ ~ ~
~i a-- ,~
O-_, U~
~D I- CO OD _l ~ In ~l~ ~ ~ ~ ~ ~ ~
r~
1~ l~i~ ~ ~L~ ~
g ~ 8 ~ o ~ o ~ o ~ ~ o a a ~+ ~+ ~+ ~+ a .,, .~ . .~
.-.
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100 parts by volume of each of the polyol mixturesgiven in Table 2 were treated as in Example 1. The designation of the polyols agrees with that of Example 1. The properties given in Table 2 were measured.
Polyol ~ing strength Modulus of Elas~ ing pro- MPa MPa DIN 53 452 ticity~a DIN perties on on rock (equivalent to 7735 coal ASTM D 790) 100 parts by wt.l + 10 parts by wt.4 68 2740 1.04 2.72 100 parts by wt.l + 15 parts by wt.4 90 2750 1.16 2.84 100 parts by wt.l + 20 parts by wt.4 115 2770 1.21 3.00 100 parts by wt.l + 30 parts by wt.4 85 2730 1.20 ' 3.02 EXA~LE 3 100 parts by volume of each of the polyol mixtures given in Table 3, with the same designation as Example 1, were mixed with 1.2 parts by volume of water and 0.6 parts by volume of a polysiloxane for foam stabilization. 100 parts by volume of the isocyanate described in Example 1 were then added to each and agitated for 30 seconds. Foam development in the liquid began in each case after 4 minutes, with solidification of the induced foam after about 15 minutes.
The properties given in Table 3 were determined for the obtained foams.
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The polyurethane reaction system may be applied to the material to be consolidated in a variety of ways. The reaction system may be poured into downwards filled drill holes which are then sealed. In such cases, it is advantageous to employ a blowing agent such as water in the reaction system.
This process is described in greater detail in German Aus-legeschrift No. 1,758,185 or French Patent No. 2,006,536.
Alternatively, the system can be applied by means of a two-compartment cartridge which maintains the isocyanate and polyol components in separate compartments. A bore hole is drilled and one or more cartridges are inserted into the hole. The cartridges are then fractured in such a way as to intimately blend the two components, and the bore hole is sealed. The reaction system in this application should con-tain a blowing agent. This method is described in greater detail in U. S. Patent No. 3,698,196.
In addition the reaction system may be injected under pressure into the material to be consolidated. The injection may be performed by machine with a working pressure of about 60 bar as is described in Gluckauf, 108, ~uly 20, 1972, pages 615-618. As discussed therein, it is disadvan-tageous to work at pressures greater than about 90 bar because of the likelihood of expanding cracks and fissures already present in the material to be consolidated. The machine may be equipped with a two component pump which draws each of the components separately so that they may be mixed immediately in front of or in the hole to which the system is to be supplied. Iron or wooden poles may be inserted into the injection hole prior to injection of the system. This would strengthen the consolidated mass and reduce the amount of .
LeA 16,016-Ca - 12 -~ ' ` ' ' ~ ' . ' ' 1074~92 system components consumed.
The injection may also be effected by placing each of the system components under pressure in separate containers and then supplying them from these containers to the material to be consolidated, for instance, pipes with one way valves may be provided from each container to a T joint at which the components are mixed and at which additional gas may be provided to insure a more thorough mixing of the components.
This method is described in more detail in German Offen-legungsschrift No. 2,123,271.
Normally, in the pouring and injection embodimentsthe reactive system includes a foaming agent. However, in certain circumstances, it may be advantageous to employ the system without such an agent so that a solid resin is formed.
In such a case it is desirable to add a hydrophilic substance, such as Zeolite type sodium alumino-silicate, as discussed hereinabove. This additive will absorb water from both the polyol component (water is quite miscible with most polyethers) and thP environment to which the system is applied thus pre-venting substantial foaming from occurring. The solid resinsystems offer greater strength for those special applications wherein it is required.
A number of specific sequences for applying the reactïonsystem of the present invention to the material to be consolidated will occur to those skilled in the art. The particular embodiments of the present invention are therefore not limited to those described above but rather the scope of the invention is defined by the claims and descriptions of particular embodiments are merely exemplary.
LeA 16,016-Ca - 13 -`A
.
.'.. - . :. :
From the preceding examples and Tables, it is evident that the binding force on coal and rock of the polyurethanes according to the invention is considerably improved with relation to the binding force usual with polyurethanes made flexible with castor oil. The bending strength, deflection and modulus of elasticity are considerably more favorable for consolidating coal and rock.
Although the invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention except as it may be limited by the claims.
LeA 16,016 -14-,
Claims (16)
1. A process for consolidating geological formations comprising applying an at least two-component reactive poly-isocyanate/polyol mixture to the material to be consolidated wherein said reactive polyisocyanate/polyol mixture comprises:
(a) a polyisocyanate, and (b) a polyol mixture comprising (i) 5-50% by weight of a polyether polyol having an OH number under 100 produced by the reaction between a compound having more than one reactive hydrogen atom per molecule and a molar excess of 1,2-alkylene oxide, and (ii) 95-50% by weight of a polyol selected from the group consisting of a polyhydroxyalkane having 2 to 4 hydroxy groups with a molec-ular weight of about 62 to 200 and a poly-ether polyol having an OH number of about 200 to 1056 with a molecular weight of about 106 to 1,000, and wherein said reactive polyisocyanate/polyol mixture under-goes an isocyanate polyaddition reaction in the material to be consolidated.
(a) a polyisocyanate, and (b) a polyol mixture comprising (i) 5-50% by weight of a polyether polyol having an OH number under 100 produced by the reaction between a compound having more than one reactive hydrogen atom per molecule and a molar excess of 1,2-alkylene oxide, and (ii) 95-50% by weight of a polyol selected from the group consisting of a polyhydroxyalkane having 2 to 4 hydroxy groups with a molec-ular weight of about 62 to 200 and a poly-ether polyol having an OH number of about 200 to 1056 with a molecular weight of about 106 to 1,000, and wherein said reactive polyisocyanate/polyol mixture under-goes an isocyanate polyaddition reaction in the material to be consolidated.
2. A process as claimed in Claim 1, wherein the compound comprising more than one reactive hydrogen atom per molecule is an amine.
3. A process as claimed in Claim 2 wherein the poly-ether is produced from the reaction of ethylene diamine and/or excess triethanolamine with 1,2-alkylene oxide.
4. A process as claimed in Claim 3 wherein the 1,2 -alkylene oxide is propylene oxide and/or ethylene oxide.
5. The process of Claim 1 wherein the polyisocyanate component is obtained by phosgenation of a formaldehydeaniline condensation product.
6. The process of Claim 1 wherein the polyol com-prises a) about 50 to 95 wt. % of polyethers having molecular weights of about 400 to 600 and OH
numbers of about 350 to 400 and b) about 50 to 5 wt. % of polyethers having molecular weights of about 2000 to 3500 and OH
numbers of about 50 to 90.
numbers of about 350 to 400 and b) about 50 to 5 wt. % of polyethers having molecular weights of about 2000 to 3500 and OH
numbers of about 50 to 90.
7. The process of Claim 6 wherein the reactive mixture is injected into the material to be consolidated.
8. The process of Claim 7 wherein the reaction components are supplied from separate pressurized containers.
9. The process of Claim 7 wherein the injection is effected by a machine operating at pressures up to about 90 bar and having a two component pump which draws each of the com-ponents separately.
10. The process of Claim 6 wherein the compound reacted with the 1,2-alkylene oxides to produce the polyethers with OH numbers between about 50 and 90 is an amine.
LeA 16,016-Ca
LeA 16,016-Ca
11. The process of Claim 10 wherein the amine is ethylene diamine or triethanolamine.
12. The process of Claim 5 wherein the reactive mixture contains a blowing agent.
13. The process of Claim 12 wherein the mixture is applied by inserting a two compartment cartridge which maintains the polyol and polyisocyanate components in separate compart-ments into a hole in the material to be consolidated, fracturing the cartridge in such a way to insure good mixing of the com-ponents and sealing the hole.
14. The process of Claim 5 wherein the mixture is applied by pouring the components before they harden into a downwardly sloping drill hole in the material to be consolidated and then sealing the drill hole.
15. The process of Claim 1 wherein the polyisocyanate is a monomeric isocyanate.
16. A process for consolidating geological formations encountered in coal mining comprising applying an at least two-component reactive polyisocyanate/polyol mixture to the material to be consolidated wherein the reactive polyisocyanate/polyol mixture comprises:
(a) a polyisocyanate, and (b) a polyol mixture comprising (i) about 5-50% by weight of a polyether polyol having an OH number under 100 produced by the reaction between a compound having more than one reactive hydrogen atom per molecule and a molar excess of 1,2-alkylene oxide, and (ii) about 95-50% by weight of a polyol selected from the group consisting of a polyhydroxyalkane having 2 to 4 hydroxy groups with a molecular weight of about 62 to 200 and a polyether polyol having an OH
number of about 200 to 1056 with a molec-ular weight of about 106 to 1,000, and wherein said reactive polyisocyanate/polyol mixture under-goes an isocyanate polyaddition reaction in the material to be consolidated.
(a) a polyisocyanate, and (b) a polyol mixture comprising (i) about 5-50% by weight of a polyether polyol having an OH number under 100 produced by the reaction between a compound having more than one reactive hydrogen atom per molecule and a molar excess of 1,2-alkylene oxide, and (ii) about 95-50% by weight of a polyol selected from the group consisting of a polyhydroxyalkane having 2 to 4 hydroxy groups with a molecular weight of about 62 to 200 and a polyether polyol having an OH
number of about 200 to 1056 with a molec-ular weight of about 106 to 1,000, and wherein said reactive polyisocyanate/polyol mixture under-goes an isocyanate polyaddition reaction in the material to be consolidated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742436029 DE2436029C3 (en) | 1974-07-26 | Process for consolidating geological formations and poured rock and earth masses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1074092A true CA1074092A (en) | 1980-03-25 |
Family
ID=5921618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA231,860A Expired CA1074092A (en) | 1974-07-26 | 1975-07-21 | Process for the consolidation of geological formations |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5139912A (en) |
| AU (1) | AU8337475A (en) |
| BE (1) | BE831668A (en) |
| CA (1) | CA1074092A (en) |
| ES (1) | ES439695A1 (en) |
| FR (1) | FR2279891A1 (en) |
| GB (1) | GB1450306A (en) |
| HU (1) | HU172758B (en) |
| PL (1) | PL110158B1 (en) |
| RO (1) | RO80835A (en) |
| SU (1) | SU635879A3 (en) |
| ZA (1) | ZA754379B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2623346C2 (en) * | 1976-05-25 | 1978-07-13 | Bayer Ag, 5090 Leverkusen | Method for consolidating geological formations and two-chamber cartridge |
| FR2375288A1 (en) * | 1976-12-27 | 1978-07-21 | Rhone Poulenc Ind | COMPOSITIONS FOR THE CONSOLIDATION OF MINING MASSES |
| US4287111A (en) * | 1976-12-27 | 1981-09-01 | Rhone-Poulenc Industries | Compositions useful for consolidation of mining deposits |
| DE2705751C2 (en) * | 1977-02-11 | 1979-03-08 | Bayer Ag, 5090 Leverkusen | Cartridge for fastening anchor rods in boreholes |
| DE2965176D1 (en) * | 1979-03-06 | 1983-05-19 | Bergwerksverband Gmbh | Process for consolidating and sealing geological and heaped rock and earth formations |
| DE3502997A1 (en) * | 1985-01-30 | 1986-07-31 | Bayer Ag, 5090 Leverkusen | METHOD FOR STRENGTHENING GEOLOGICAL FORMATIONS |
| DE3610935A1 (en) * | 1986-04-02 | 1987-10-08 | Bergwerksverband Gmbh | METHOD FOR STRENGTHENING AND SEALING Loose stone |
| JP2655737B2 (en) * | 1990-03-28 | 1997-09-24 | 建設省土木研究所長 | Filler for holes and impermeable material |
-
1973
- 1973-07-21 RO RO7382913A patent/RO80835A/en unknown
-
1974
- 1974-12-10 GB GB5342774A patent/GB1450306A/en not_active Expired
-
1975
- 1975-07-08 ZA ZA00754379A patent/ZA754379B/en unknown
- 1975-07-18 FR FR7522523A patent/FR2279891A1/en active Granted
- 1975-07-21 CA CA231,860A patent/CA1074092A/en not_active Expired
- 1975-07-23 BE BE158554A patent/BE831668A/en not_active IP Right Cessation
- 1975-07-24 ES ES439695A patent/ES439695A1/en not_active Expired
- 1975-07-24 AU AU83374/75A patent/AU8337475A/en not_active Expired
- 1975-07-25 PL PL1975182267A patent/PL110158B1/en unknown
- 1975-07-25 HU HU75BE00001236A patent/HU172758B/en not_active IP Right Cessation
- 1975-07-25 JP JP50090322A patent/JPS5139912A/en active Pending
-
1977
- 1977-04-27 SU SU772474751A patent/SU635879A3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE2436029A1 (en) | 1976-02-05 |
| GB1450306A (en) | 1976-09-22 |
| ES439695A1 (en) | 1977-03-16 |
| FR2279891A1 (en) | 1976-02-20 |
| DE2436029B2 (en) | 1976-05-26 |
| SU635879A3 (en) | 1978-11-30 |
| ZA754379B (en) | 1976-06-30 |
| PL110158B1 (en) | 1980-07-31 |
| FR2279891B1 (en) | 1977-12-09 |
| HU172758B (en) | 1978-12-28 |
| AU8337475A (en) | 1977-01-27 |
| JPS5139912A (en) | 1976-04-03 |
| RO80835A (en) | 1984-06-21 |
| BE831668A (en) | 1975-11-17 |
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