Abstract: A coated proppant includes a solid core proppant particle, a first resin coating, and a second coating on the first resin coating. The second coating includes the reaction product of one or more curatives and one or more preformed aliphatic or cycloaliphatic based isocyanurate tri-isocyanates, derived from aliphatic diisocyanates, cycloaliphatic diisocyanates, or a combination of aliphatic and cycloaliphatic diisocyanates.

Abstract: A mobile volumetric concrete mixing system includes a suction system that vacuums up trench spoils while a trench is being cut. These trench spoils are then screened on-site for particle size to be reused and mixed with water, cement, and/or other admixtures at an auger mixer to form a backfill mixture. This backfill mixture may then be loaded into a hopper that continuously agitates the mixture so that the mixture does not harden before pouring. The agitating hopper is coupled to a discharge chute of the auger mixer and includes one or more augers disposed at various orientations that the backfill mixture is channeled through. From the agitating hopper, the backfill mixture is channeled to an applicator that moves along the trench and that enables the mixture to be quickly poured into the trench with little clean-up required.

Abstract: A coated article, such as a proppant, includes a base substrate and one or more polyurethane based coatings on an outer surface of the base substrate. The one or more polyurethane based coatings including the reaction product of an isocyanate component that has at least one isocyanate and an isocyanate-reactive component that has one or more simple polyols and one or more polyether monols at a ratio from 1:18 to 18:1. An isocyanate index is greater than 0.2 and less than 1.0.

Abstract: A machine for backfilling pavement material into a trench defined within a pavement surface includes a frame defining a longitudinal axis and having at least one wheel. The frame being configured to move along the pavement surface. A hopper supported on the frame and including an inlet opening configured to receive pavement material and an outlet opening configured to discharge pavement material into the trench. The machine also includes a compactor supported on the frame and aligned with the hopper along the longitudinal axis. The compactor is configured to compact the discharged pavement material within the trench.

Abstract: Provided are proppants for use in hydraulic fracturing operations. The proppants comprise particles having coatings disposed on them as described herein. The proppants exhibit reduced dust generation, for instance during transloading, conveying and/or offloading of the proppant at a wellsite and/or at intermediate shipping transload points.

Abstract: Provided are proppants for use in hydraulic fracturing operations. The proppants comprise particles having coatings disposed on them as described herein. The proppants exhibit reduced dust generation, for instance during transloading, conveying and/or offloading of the proppant at a wellsite and/or at intermediate shipping transload points.

Abstract: A flowrate control device for a fluid, includes a cartridge body defining a path for the fluid and having an upstream portion for the entry of the fluid, and a downstream portion provided with an outlet opening for the fluid. A shutter element is arranged in the cartridge body for sliding movement between an upstream end of the cartridge body corresponding to a minimum throttling position for the fluid and a downstream end of the cartridge body corresponding to a maximum throttling position for the fluid. The shutter element is provided with a throttling wall arranged downstream for throttling the outlet opening in a controlled manner and an upstream wall cooperating with the upstream portion of the cartridge body for bounding an inlet section for the fluid. A counter spring element exerts a contrasting force on the shutter element suitable for displacing the shutter element towards the upstream end.

Abstract: A method for exposing a substrate to water under superatmospheric pressure at a temperature of at least 70° C. includes (a) applying a reaction mixture to a substrate, which reaction mixture has an isocyanate index of at least 10 and includes an aromatic polyisocyanate component, a polyol component having a polyol with a hydroxyl equivalent weight of at least 500, and a catalyst component having an isocyanate trimerization catalyst, and at least partially curing the reaction mixture to form a polyisocyanurate or polyurethane-isocyanurate polymer having a glass transition temperature of at least 80° C., and (b) exposing the substrate and the polyisocyanurate or polyurethane-isocyanurate polymer to water under superatmospheric pressure at a temperature of at least 70° C.

Abstract: Embodiments relate to coated proppants, a method of making the coated proppants, and a method to use coated proppants in fracturing subterranean formations around oil and gas wells to improve oil recovery. The proppants are coated with an oil well treatment agent, specifically, a wax inhibitor and/or a pour point depressant composition.

Abstract: A machine for backfilling pavement material into a trench defined within a pavement surface includes a frame defining a longitudinal axis and having at least one wheel. The frame being configured to move along the pavement surface. A hopper supported on the frame and including an inlet opening configured to receive pavement material and an outlet opening configured to discharge pavement material into the trench. The machine also includes a compactor supported on the frame and aligned with the hopper along the longitudinal axis. The compactor is configured to compact the discharged pavement material within the trench.

Abstract: A coated proppant includes a solid core proppant particle, and a sulfide recovery coating that includes a sulfide capturing agent embedded within a polymer resin matrix. The sulfide capturing agent is a metal oxide.

Abstract: A coated proppant includes a solid core proppant particle and a heavy metal recovery coating, including heavy metal recovery crystals embedded within a polymer resin matrix. A process for the manufacture of a coated proppant includes providing a solid core proppant particle, and forming on the solid core proppant particle, a heavy metal recovery coating including heavy metal recovery crystals embedded within a polymer resin matrix.

Abstract: A fiber-reinforced composite article useful for contaminant removal comprising at least one single layer of a fiber-reinforced composite having (a) at least one first polymer fiber-free region containing material adapted for removing contaminants, (b) at least one second polymer fiber-rich region containing fiber reinforcement material; and (c) at least one third polymer boundary region containing a portion of the first polymer fiber-free region and a portion of the second polymer fiber-rich region; a process for manufacturing the fiber-reinforced composite article; and a process for removing contaminants from a liquid fluid using the fiber-reinforced composite article.

Abstract: A sulfide recovery coating for containers, tanks, pipes, and pipelines, which sulfide recovery coating includes a sulfide capturing agent embedded within a polymer resin matrix. The sulfide capturing agent is a metal oxide and accounts for less than 70 wt % of a total weight a composition for forming the sulfide recovery coating.

Abstract: A contaminant capturing liner includes a cured product of a composition including an epoxy resin component including at least one alkanolamine modified epoxy resin and at least one hardener. The contaminant capturing liner includes at least one contaminant capturing material embedded therewithin, and the contaminant capturing liner is a permeable layer having a difference between dry glass transition temperature and wet glass transition temperature of at least 14 C.

Abstract: Embodiments relate to a proppant particle or a solid article that includes a proppant particle/solid article and one or more coatings on an outer surface of the proppant particle/solid article including one or more well treatment agents and one or more controlled release polymer resins. Each well treatment agent is at least one selected from the group of a scale inhibitor, a wax inhibitor, a pour point depressant, asphaltene inhibitor, an asphaltene dispersant, a corrosion inhibitor, a biocide, a viscosity modifier, and a de emulsifier. Each controlled release polymer resin is at least one selected from the group of a polyurethane based resin, an epoxy resin, a phenolic resin, and a furan resin.

Abstract: A mobile volumetric concrete mixing system includes a suction system that vacuums up trench spoils while a trench is being cut. These trench spoils are then screened on-site for particle size to be reused and mixed with water, cement, and/or other admixtures at an auger mixer to form a backfill mixture. This backfill mixture may then be loaded into a hopper that continuously agitates the mixture so that the mixture does not harden before pouring. The agitating hopper is coupled to a discharge chute of the auger mixer and includes one or more augers disposed at various orientations that the backfill mixture is channeled through. From the agitating hopper, the backfill mixture is channeled to an applicator that moves along the trench and that enables the mixture to be quickly poured into the trench with little clean-up required.

Abstract: A coated proppant includes a solid core proppant particle, a first resin coating, and a second coating on the first resin coating. The second coating includes the reaction product of one or more curatives and one or more preformed aliphatic or cycloaliphatic based isocyanurate tri-isocyanates, derived from aliphatic diisocyanates, cycloaliphatic diisocyanates, or a combination of aliphatic and cycloaliphatic diisocyanates.

Abstract: Solid, non-melting polyurethanes having a glass transition temperature of at least 40° C. and free isocyanate groups are self-bonding materials that are useful in a variety of adhesive and molding operations. Under conditions of heat and moisture, these polyurethanes will self-bond. The polyurethanes can be used as adhesive coatings, which are solid and non-tacky and thus can be transported and stored easily under ambient conditions. These polyurethane adhesives are especially useful in applications in which, due to the location and/or orientation of the substrates, liquid or melting materials cannot be applied easily or will run off the substrates.

Abstract: Polyisocyanurate or polyurethane-isocyanurate polymers are made by curing an aromatic polyisocyanate or a mixture of at least one aromatic polyisocyanate and at least one polyol having a hydroxyl equivalent weight of up to 200 in which the isocyanate index is at least 2.00, in the presence of at least one isocyanate trimerization catalyst, to form a polyisocyanurate or polyurethane-isocyanurate polymer having a glass transition temperature of at least 100° C., and then exposing the polyisocyanurate or polyurethane-isocyanurate polymer formed step a) to water under superatmospheric pressure at a temperature of at least 70° C.