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Mine stopping caulk
| Details |
Inventors: Andreichuk, Gregory;
Assignee: The Celotex Corporation (Tampa, FL)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A process for sealing geological formations and mine stoppings by applying to these substrates an aqueous, non-cementitious caulk composition comprising an alkali metal silicate; filler material including at least one silica product or silicate other than an alkali metal silicate; a water-soluble or water-dispersible acrylic polymer modifier; and water, and allowing the caulk composition to dry to form an air flow resistant seal on the substrates. A highly satisfactory polymeric modifier is used in the form of a polymer emulsion, such as an emulsion of a self-plasticizing acrylic polymer having a low Tg. |
|
DETAILED DESCRIPTION OF THE INVENTION The caulking composition of this invention is highly effective for use in underground coal mines as a sealant against air losses.
The caulk is used as a perimeter and void sealant in the installation and repair of mine ventilation stoppings.
The composition is composed of filler material, which is preferably inorganic, in a water based alkali metal silicate and polymer system and is especially useful in enhancing the performance of conventional mine stoppings by preventing air infiltration for longer periods of time than conventional sealants.
The alkali metal silicate is preferably sodium silicate.
The sodium silicate employed may be any of those available, which includes those having a molar ratio of SiO.
sub.
2 /Na.
sub.
2 O of 1 to 4:1, particularly those composed of between 2 and 4 moles of SiO.
sub.
2 per mole of Na.
sub.
2 O.
An aqueous solution of the sodium silicate is usually used.
Acceptable sodium silicates are discussed in the literature, e.
g.
, in the Reimer U.
S.
Pat.
Nos.
2,207,759 and 2,330,145.
The modifier included in the caulking composition is an agent which acts to desensitize the composition to moisture and thereby prevents resolubilizing of the alkali metal silicate.
Highly satisfactory modifying agents are water-soluble or water-dispersible acrylic homopolymers and copolymers having an average molecular weight of at least about 10,000.
Illustrative of the polymeric agents are the various homopolymers and copolymers of acrylates, methacrylates, acrylamides, methacrylamides, acrylic acid, and methacrylic acid.
The acrylic homo- or copolymer desirably has a low glass transition temperature, e.
g.
, below 0.
degree.
C.
, and good compatibility in the caulking composition.
Especially preferred polymers are self-plasticizing thermoplastic acrylic polymers characterized by a low Tg and excellent flexibility.
The low Tg (-45.
degree.
C.
) emulsion polymer with internal plasticizer supplied by Rohm and Haas Company under the trademark Rhoplex EC-1685 is an example of such a polymer
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