Coated proppants useful in fracking operations in oil and gas production are coated with a novolac resin containing a linear or cyclic organopolysiloxane of specific composition. The coatings are more fracture resistant, thus producing less fines during use, resulting in longer production campaigns.

Sealers, construction products, and methods of sealing construction products are provided. In an exemplary embodiment, a sealer includes a first part and a second part. the first part includes an epoxy resin having an epoxy resin molecular weight of about 5,000 Daltons or greater, and also includes an epoxy functional diluent having a diluent molecular weight of about 2,000 Daltons or less. The second part includes a crosslinking agent that is a polyamine. The sealer further includes a particulate with a specific gravity of from about 1 to about 5 grams per cubic centimeter.

Sealers, construction products, and methods of sealing construction products are provided. In an exemplary embodiment, a sealer includes a first part and a second part. the first part includes an epoxy resin having an epoxy resin molecular weight of about 5,000 Daltons or greater, and also includes an epoxy functional diluent having a diluent molecular weight of about 2,000 Daltons or less. The second part includes a crosslinking agent that is a polyamine. The sealer further includes a particulate with a specific gravity of from about 1 to about 5 grams per cubic centimeter.

A powder coating composition includes: a film-forming resin; a lignin polymer that is substantially free of sulfonate or sulfonic acid groups; and a crosslinker reactive with functional groups of the film-forming resin and the lignin polymer. The lignin polymer includes at least 5 weight % of the powder coating composition, based on the total solids weight of the powder coating composition. Further, when cured to form a coating, the film-forming resin and lignin polymer react and chemically bond with the crosslinker to form a binder of the coating.

A powder coating composition includes: a film-forming resin; a lignin polymer that is substantially free of sulfonate or sulfonic acid groups; and a crosslinker reactive with functional groups of the film-forming resin and the lignin polymer. The lignin polymer includes at least 5 weight % of the powder coating composition, based on the total solids weight of the powder coating composition. Further, when cured to form a coating, the film-forming resin and lignin polymer react and chemically bond with the crosslinker to form a binder of the coating.

An anti-icing coating can include an amphiphilic copolymer on a surface of an article.

Provided are an epoxy resin including: an epoxidized product of monoalkyl dihydroxybenzene; and a compound that is detected in the molecular weight range from a molecular weight at the peak top of the epoxidized product of the monoalkyl dihydroxybenzene to the molecular weight at the peak top+20 to 40 and has a peak area % of 0.1% to 0.8% in a GPC chart, and an epoxy resin including an epoxidized product of monoalkyl catechol in which the ratio of the total content of a cyclic compound having a cyclic structure that has two adjacent oxygen atoms derived from the monoalkyl catechol as constituent atoms and a monoglycidyletherified product of the monoalkyl catechol to the content of a diglycidyletherified product of the monoalkyl catechol is in the range of 0.10 to 0.40 as measured by high performance liquid chromatography.

Provided are an epoxy resin including: an epoxidized product of monoalkyl dihydroxybenzene; and a compound that is detected in the molecular weight range from a molecular weight at the peak top of the epoxidized product of the monoalkyl dihydroxybenzene to the molecular weight at the peak top+20 to 40 and has a peak area % of 0.1% to 0.8% in a GPC chart, and an epoxy resin including an epoxidized product of monoalkyl catechol in which the ratio of the total content of a cyclic compound having a cyclic structure that has two adjacent oxygen atoms derived from the monoalkyl catechol as constituent atoms and a monoglycidyletherified product of the monoalkyl catechol to the content of a diglycidyletherified product of the monoalkyl catechol is in the range of 0.10 to 0.40 as measured by high performance liquid chromatography.

Coating compositions for coating an oilfield operational component, and related methods, may include in some aspects a coating composition having a trifunctional silane, a silanol, and a filler. The coating composition may be applied to a surface of the oilfield operational component that is configured to be exposed to a fluid. The coating composition may be applied to at least partially cover or coat the surface. The coating composition may be configured to chemically bond with a cured primer composition that includes an epoxy.

Coating compositions for coating an oilfield operational component, and related methods, may include in some aspects a coating composition having a trifunctional silane, a silanol, and a filler. The coating composition may be applied to a surface of the oilfield operational component that is configured to be exposed to a fluid. The coating composition may be applied to at least partially cover or coat the surface. The coating composition may be configured to chemically bond with a cured primer composition that includes an epoxy.