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Method for preparing graphene oxide modified composite phase-change microcapsule

The invention discloses a method for preparing graphene oxide modified composite phase-change microcapsules. The method specifically comprises the following steps: preparing a graphene oxide solid from graphite powder, concentrated sulfuric acid, sodium nitrate, potassium permanganate and deionized water; mixing the obtained graphene oxide solid with absolute ethyl alcohol and a silane coupling agent, and performing a reaction so as to obtain a double-bond modified functional graphene oxide solid; uniformly mixing the obtained functional graphene oxide solid with a phase-change material, a reaction monomer, a cross-linking agent, a reactive emulsifier and deionized water, and performing ultrasonic dispersion so as to form an oil-in-water type pre-emulsion; and putting the obtained oil-in-water type pre-emulsion into a hot water bath, continuously stirring, further adding an initiator solution, and performing a heat-preservation reaction, thereby obtaining the graphene oxide modified composite phase-change microcapsules. By adopting the method disclosed by the invention, composite phase-change microcapsules which are high in encapsulation efficiency, stable in property, good in heat conductivity, appropriate in phase-change temperature and relatively high in phase-change latent heat enthalpy can be prepared.
Owner:SHAANXI UNIV OF SCI & TECH

Hydrogel antifouling fiber, preparation method thereof and preparation method of implanted type high-strength hydrogel antiflouling coating layer

The invention discloses a hydrogel antifouling fiber, a preparation method of hydrogel antifouling fiber and a preparation method of an implanted type high-strength hydrogel antiflouling coating layer, and relates to antiflouling materials, preparation methods of the antiflouling materials, and preparation methods of vessel antifouling coating layers, for mainly solving the technical problems that the conventional PVA (Polyvinyl Acetate) fiber implanted type vessel antiflouling coating layer is poor in antifouling effect and short in service life. The hydrogel antifouling fiber disclosed by the invention is a fiber with a core-shell structure, the shell layer of the fiber is made of polyacrylamide, and the core layer is made of carbon nano tube modified polyacrylamide. The preparation method comprises the following steps: 1, preparing polyacrylamide hydrogel, 2, preparing a core layer spinning dope, 3, preparing a shell layer spinning dope, 4, spinning by using a wet method to obtain the hydrogel antifouling fiber. The preparation of the antifouling coating layer comprises the following steps: spraying implantation gel onto a substrate, further implanting the hydrogel antifouling fiber into the substrate through a high-pressure static implantation technique, and drying to obtain the implanted type high-strength hydrogel antifouling coating layer. The coating layer is not changed when being soaked in seawater or industrial water for 6 months, so that the coating layer can be applied to vessel antifouling.
Owner:HARBIN ENG UNIV

Preparation method and application of polyoxyethylene-based polymer filtrate reducer

The invention relates to a preparation method and application of a polyoxyethylene-based polymer filtrate reducer for oil and gas field drilling fluid, aiming at solving the problems that an existing filtrate reducer for the drilling fluid has poor high temperature resistance and hypersalinity resistance and poor rheological property at high temperature. According to the technical scheme, the preparation method comprises the following steps of adding allyl polyoxyethylene ether into water and heating for dissolving; then adding 2-acrylamide-2-methyl propanesulfonic acid and acrylamide, adding an initiator and stirring uniformly, and regulating the pH of a system to be 8-10 by using an NaOH solution; and finally reacting for 2-5 hours at 50-80 DEG C to obtain a gel product through a copolymerization reaction, purifying and extracting by using absolute ethyl alcohol, cutting and pelleting, drying in vacuum, and smashing so as to prepare the polymer filtrate reducer. According to the evaluation of the temperature resistance, the salt resistance and rheological property of the polymer basic mud by adding the filtrate reducer into fresh water basic mud and salt water base, the filtrate reducer has strong salt resistance, good high temperature resistance and stable rheological property. The preparation method is simple and mild in synthesis conditions.
Owner:SOUTHWEST PETROLEUM UNIV
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