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Aqueous sealant from alkali silicate, liquid polysulfide polymer and coal tar
| Details |
Inventors: Villa, Jose L.; Osborn, Stephen W.;
Assignee: Thiokol Corporation (Newtown, PA)
Primary Examiner: Tillman; Murray
Assistant Examiner: Koeckert; Arthur H.
Attorney, Agent or Firm:
Curable liquid polymers selected from mercaptan-terminated polysulfide polymers, polyepoxides and oganosilicon polymers are extended by mixing therewith, prior to curing 10% to 200% by weight, based on the weight of liquid polymer, of an aqueous colloidal dispersion selected from aqueous alkali metal silicates having an M.sub.2 O:SiO.sub.2 ratio of 0:1 to 1:1 and aqueous magnesium oxide. Upon curing of the mixture to solid form, nearly all of the water of the aqueous dispersion remains bound in the solid cured material and little, if any, shrinkage occurs. |
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DETAILED DESCRIPTION We claim as our invention: 1.
A fluid sealant composition adapted to be converted by a curing agent to rubber-like form, said composition comprising (a) liquid mercapto-terminated polysulfide polymer as its sole organic polymer, (b) 10% to 200% by weight, based on the weight of said polymer, of aqueous alkali metal silicate containing about 20% to 60% by weight solids, and (c) from 10% to 200% by weight, based on the weight of said polysulfide polymer, of coal tar.
2.
A fluid sealant composition according to claim 1 wherein said aqueous silicate is a sodium silicate.
3.
A fluid sealant composition according to claim 1 wherein said aqueous silicate is a potassium silicate.
4.
A fluid sealant composition adapted to be converted by a curing agent to rubber-like form, said composition comprising (a) liquid mercapto-terminated polysulfide polymer as its sole organic polymer, (b) 10% to 200% by weight, based on the weight of said polymer, of aqueous alkali metal silicate containing 20% to 60% by weight solids and having an M.
sub.
2 O:SiO.
sub.
2 ratio of 1:1 to 1:4 and (c) from 10% to 200% by weight of coal tar, based on the weight of said polysulfide polymer.
5.
In a process for curing a fluid sealant composition based on mercapto-terminated polysulfide polymer as its sole organic polymer to convert said fluid composition into rubber-like form, the improvement which comprises mixing with said polymer as an extender prior to curing from 10% to 200% by weight, based on the weight of said polymer, of aqueous alkali metal silicate containing about 20% to 60% by weight of solids and from 10% to 200% by weight of coal tar, based on the weight of said polysulfide polymer.
6.
The cured composition of claim 1.
7.
The cured composition of claim 4.
Description:
This invention relates to sealant, adhesive and coating compositions and especially to sealant formulations based on liquid polymers which are convertible by curing agents to rubbery form and which are useful in sealing cracks in and adhesively bonding cementitious materials used in the construction of roads, airfields, docks, canals, buildings and the like, and also in the adhesive bonding of substrates such as glass, aluminum and the like, as well as to a method of converting such sealants into rubber-like form
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