Durable polyurea copolymer coatings can be applied to surfaces that come in contact with fluids, such as biological fluids, thereby passivating the surface. Polyurea copolymer coating compositions comprise a reaction product of (a) a diamine composition that includes a polyethylene glycol diamine, and optionally, a dipiperidyl alkane; (b) a diisocyanate; and (c) one or more photoreactive compounds, one or more biomolecules, or a combination of these. Solutions containing polyurea copolymers, coated surfaces and methods are also described.

A system and method is provided for reducing scale inhibitor demand for protecting an electrical submersible pump (ESP) for downhole service in a wellbore. An exemplary system includes a motor including a housing that houses a motor stator. The system also includes a pump intake coupled to a pump stage, wherein the pump stage includes an impeller and a diffuser, wherein the pump stage is operatively coupled to the motor stator. A substantially hydrophobic coating substantially covers each surface of the motor, motor stator, housing, pump stage, impeller, and diffuser, that is in direct contact with fluids in the wellbore.

A composition for coating film formation containing a water-based resin and a colloidal silica. A measurement coating film sample 1 produced by a predetermined method has an elastic modulus of 100 MPa or more. A content of the colloidal silica may be 30 parts by mass or less with respect to 100 parts by mass of the water-based resin.

A two-part (2K) water-borne coating composition includes water; a) a binder part comprising (a1) a hydroxyl-functional (meth)acrylate copolymer; (a2) a non-aromatic polyester having active hydrogen groups; and b) a crosslinker part comprising a polyisocyanate compound having pendant NCO groups, wherein the (a2) non-aromatic polyester has a number average molecular weight (Mn) of from 500 to 5000 Daltons, an acid value from 0 to 30 mg KOH/g, a calculated hydroxyl value of from 100 to t 600 mg KOH/g and a calculated hydroxyl functionality of from 2 to 8; and wherein the (a1) (meth)acrylate copolymer is the reaction product of a monomer mixture which comprises i) a hydroxyl functional adduct of a monoepoxyester and an unsaturated carboxylic acid; ii) a hydroxyl functional unsaturated monomer which is different from component i); iii) an unsaturated acid functional monomer; and iv) a (meth)acrylate monomer represented by Formula

H.sub.2CCG.sup.aCO.sub.2R.sup.a(MA).

The present invention provides methods of reducing friction on a surface of an apparatus that stores or transports a gas, comprising: (a) contacting the surface either directly or through an intermediate organometallic layer with a fluorinated material in a diluent, wherein the fluorinated material has the following structure: ##STR00001##
wherein A is an oxygen radical or a chemical bond; n is 1 to 20; Y is H, F, C.sub.nH.sub.2n+1 or C.sub.nF.sub.2n+1; X is H or F; b is at least 1, m is 0 to 50, p is 1 to 20, and Z is an acid group or an acid derivative; (b) forming a hydrophobic surface layer on the surface; and (c) introducing the gas into the apparatus.

The present invention relates to a perfluoropolyether group-containing silane compound represented by formula (1): Rf-X.sup.1X.sup.2NQ.sub.kT.sub.2-k (1), and a method for preparing the same. The present invention also relates to a perfluoropolyether group-containing silane compound represented by formula (2), ##STR00001##
and a method for preparing the same. The present invention also relates to a perfluoropolyether group-containing silane compound represented by formula (3), ##STR00002##
and a method for preparing the same. The perfluoropolyether group-containing silane compound of the present invention can be used for a surface treatment agent so that the substrates such as glass etc processed by the surface treatment agent are excellent in anti-fouling, anti-fingerprint, scrape resistant and abrasion resistant performances. Moreover, the preparation method of each of the compounds of the present invention is simple in process, easy to operate and implement.

A surface-treating agent containing a fluoropolyether group-containing silane compound (A) and a fluoropolyether group-containing silane compound (B) represented by formula (1) or (2) below:
R.sup.F1.sub.X.sup.AR.sup.Si.sub.(1)
R.sup.Si.sub.X.sup.AR.sup.F2X.sup.AR.sup.Si.sub.(2)
wherein R.sup.F1, X.sup.A, R.sup.Si, R.sup.F2, , and are as defined herein.

The present invention is directed to environmentally benign coatings that can prevent fouling of submerged structures and surfaces in the marine environment. The coating is essentially a grease composition composed of an organic acids salt, mineral oil, a solvent and alkaline silicate. The sulfonate thickener is an oil soluble dispersing agent selected from a plurality of organic acids in a form of alkali metal salt or alkaline earth metal salt thereof, such as calcium sulfonate. Coating compositions of the invention can be used to coat surfaces, such that when such surfaces are exposed to or kept submerged in seawater they will prevent fouling of such surfaces when exposed to the marine environment for extended time.

Winter icing can adversely impact transportation systems (aircrafts, drones, trains, etc.), infrastructure, and energy systems, among many other things. Existing ice-shedding coatings generally suffer from low durability under various mechanical, chemical, and environmental stresses. The polyurethane-based, stress-localized ice-shedding coatings described herein present a novel material paradigm to develop highly durable ice-shedding coatings capable of withstanding harsh aerospace and other industrial conditions. By optimizing the chemical composition and processing of the coating, a uniform, highly durable, polyurethane-based ice-shedding coating has been achieved that can be applied to a variety of surfaces. These coatings have been comprehensively tested, including ice adhesion strength measurements, ice-shedding capabilities in an icing wind tunnel, and a set of mechanical, chemical and environmental durability tests. These ice-shedding surfaces promise a feasible approach to address long-standing icing problems in aircrafts, drones, off-shore wind-turbines and other types of equipment and infrastructure.

A method of fabricating quantum dots layer is provided. The method includes converting a plurality of first block regions of a substrate from having a first property into having a second property different from the first property, the first property being selected from hydrophilic, oleophilic, and hydro-oleophobic, the second property being selected from hydrophilic and oleophilic; coating the plurality of first block regions with a first quantum dots material solution including a first ligand chelated to a first quantum dots material in a first solvent having the second property; converting the plurality of first block regions from having the second property into having the first property, and converting a plurality of second block regions of the substrate from having the first property into having the second property; and coating the plurality of second block regions with a second quantum dots material solution including a second ligand.