Modified geopolymer compositions, processes and uses
View Patent ↗The present invention relates to modified geopolymer compositions, geopolymer-coated organic polymer substrates, and methods of manufacturing and articles comprising same.
1. A modified geopolymer composition that comprises (i) a stabilized geopolymer-organic polymer latex composition comprising a mixture of a geopolymer and an organic polymer latex, wherein the geopolymer is an inorganic aluminosilicate composition having less than 36.0 weight percent of water, based on the total weight of water and geopolymer, and having a Si/Al molar ratio of from 1.70 to 3.0.
2. A modified geopolymer composition that is a stabilized geopolymer-organic polymer latex composition comprising a uniform mixture of a geopolymer and an organic polymer latex.
3. The modified geopolymer composition as in claim 2 , the stabilized geopolymer-organic polymer latex composition comprising a first mixture of a hydrated polysialate and from 1.0 weight percent to 50 weight percent of an organic polymer latex, weight percent of the organic polymer latex being based on total weight of the first mixture.
4. The modified geopolymer composition as in claim 3 , the hydrated polysialate being of empirical formula (G): (M) y [-(—SiO 2 ) z —AlO 2 )] x .w H 2 O (G), wherein each M independently is a cation of Group 1 of the Periodic Table of the Elements; x is an integer of 2 or higher and represents a number of polysialate repeat units; y is an integer selected so that a ratio of y to x is greater than zero (y/x >0); z is a rational or irrational number of from 1 to 35; and w is a rational or irrational number such that ratio of w to x represents a ratio of moles of water per polysialate repeat unit.
5. The modified geopolymer composition as in claim 3 , wherein the organic polymer latex, which is used to form the first mixture, comprises a second mixture comprising a water-borne organic polymer latex and from 0.05 weight percent to 10 weight percent of a latex stabilizer, weight percent of the latex stabilizer being based on total weight of the second mixture.
6. The modified geopolymer composition as in claim 5 , the water-borne organic polymer latex comprising a water-borne dispersion of polypropylene, polybutylene, polystyrene, or poly(styrene-butadiene).
7. The modified geopolymer composition as in claim 3 , wherein the organic polymer latex, which is used to form the first mixture, comprises an organic polymer latex powder.
8. The modified geopolymer composition as in claim 7 , the organic polymer latex powder comprising a homopolymer prepared from, and comprising residues of, acrylic acid monomer or a poly(styrene butadiene) copolymer.
9. The modified geopolymer composition as in claim 2 , the stabilized geopolymer-organic polymer latex composition, after being cured and dried in contact with a coating-ready surface of an organic polymer substrate, has a bond strength of 50.0 kilopascals (kPa) or greater.