CPC C09K 8/805 (2013.01) [C09K 8/62 (2013.01); E21B 43/267 (2013.01)] | 14 Claims |
1. A method for forming a coated proppant, comprising applying at least one polyisocyanate and starch to the surface of solid substrate particles, wherein the solid substrate particles are thermally stable to a temperature of at least 150° C., and reacting at least a portion of the polyisocyanate with at least a portion of the starch at the surface of the substrate particles in the presence of a urethane catalyst at an elevated temperature of up to 150° C. and for a period of up to 10 minutes to produce a solid polymeric coating at the surface of the solid substrate particles.
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