102results about How to "Good dispersion and suspension" patented technology

The invention discloses a core-shell type oil-based drilling fluid plugging and bridging particle and a preparation method thereof. The bridging particle adopts a core-shell structure particle formedby coating an oleophilic polymer layer on the surface of calcium carbonate particles, wherein the oleophilic polymer is a macromolecular copolymer of butyl acrylate, styrene and octadecyl methacrylate. According to the core-shell type oil-based drilling fluid plugging and bridging particle, an oleophilic polymer film layer is attached onto the surface of the original plugging and bridging particle, so that embrittlement of the original plugging and bridging particle is reduced, the pressure-bearing capacity of the original plugging and bridging particle in drilling fluid plugging slurry reaches 5MPa or higher, the density of the original plugging and bridging particle is reduced, the suspension property of the particle in the oil-based drilling fluid is increased, and by enhancing lipophilic property of the original plugging and bridging particle, the aims of improving the suspension dispersity of the plugging and bridging particle in the oil-based drilling fluid and improving the pressure-bearing ability of the whole oil-based drilling fluid plugging formula are achieved. In addition, the bridging particle is simple and feasible in preparation method and has excellent market popularization value.

The invention discloses a preparation method of casting coating, and belongs to the technical field of coating preparation. Firstly, rice hulls serve as raw materials, the rice hulls are smashed, ricehull smashed materials are obtained, the rice hull smashed materials react at high temperature, silicon carbide does not easily suffer from an oxidization reaction, and the burning-on defect generated due to metal penetration of the casting coating prepared with the method can be effectively avoided; glass fibers serve as raw materials, the surfaces of the glass fibers also contain silanol groups, the surface tension of the silicon carbide is reduced, the surface energy of the silicon carbide is reduced, and the suspension dispersity is improved; kaolin and quartz stones serve as raw materials, the high temperature resistance of the kaolin and the quartz stones is extremely good, and the abrasion resistance of the kaolin and the quartz stones is good; sardine bones serve as raw materials,the sardine bones contain a large amount of fluorine, fluorine is bound on the surface of modified inorganic matter through a fermentation effect, and the suspension dispersity of the casting coatingprepared with the method is further improved; and polyvinyl alcohol is strong organic adhesive, the strength of the casting coating can be improved, and broad application prospects are achieved.

The invention discloses an electrophoretic particle and a preparation method thereof, a microcapsule and an electronic ink screen. According to the invention, the electrophoretic particle is a nanoparticle with a core-shell structure, wherein the core is TiO2 or ZnO; the shell is a macromolecular polymer modified on the core; and the macromolecular polymer comprises a hydrophobic segment and a hydrophilic segment. According to the invention, the preparation method of the electrophoretic particle comprises the steps: modifying a chain transfer agent; modifying polystyrene; modifying poly-oligo polyethylene glycol methyl ether methyl acrylate; and modifying polyelectrolyte. According to the invention, the microcapsule comprises the electrophoretic particle provided by the invention. According to the invention, the electronic ink screen comprises the microcapsule provided by the invention.