5results about How to "Improve surface hydrophilicity" patented technology

This invention relates to the field of polypropylene film technology and discloses a preparation process for biaxially oriented polypropylene film. The invention involves melting, extruding, and water-cooling polypropylene resin and polymer-loaded silver nanoparticles in an extrusion casting machine, followed by transverse and longitudinal stretching, heat setting, and winding in a biaxial tensile testing machine to obtain a biaxially oriented polypropylene film. The polymer-loaded silver nanoparticles exhibit good compatibility with polypropylene and have minimal impact on the mechanical properties of the polypropylene film. The polymer-loaded silver nanoparticles are uniformly dispersed in the polypropylene film matrix, and the smaller particle size of the silver nanoparticles exposes more antibacterial sites, significantly improving the antibacterial properties of the film. Furthermore, polyitacrylamide contains hydrophilic carboxyl groups, amide bonds, and bisphenol groups; its addition to the polypropylene film helps reduce the water contact angle and improve surface hydrophilicity.

This invention relates to the field of mineral processing technology, and particularly to a depressant for molybdenum sulfide ore and a flotation separation method and application for copper-molybdenum sulfide minerals. The depressant comprises polyphenols; the polyphenols have the molecular formula C0.05. 32 H 30 O 11 The molecular weight is 590.57 g / mol, and the degree of polymerization is 2-11. The molybdenum sulfide mineral depressant is used for the flotation of copper-molybdenum sulfide minerals. The copper-molybdenum sulfide minerals contain chalcopyrite and molybdenite, with a mass ratio of 1-2:1. This invention provides a molybdenum sulfide mineral depressant and a flotation separation method and application for copper-molybdenum sulfide minerals. The aim is to solve the problems of high toxicity, high loss rate, and high intermingling of existing copper-molybdenum sulfide mineral separation flotation depressants, and to achieve effective separation of chalcopyrite and molybdenite.

A long-lasting antifouling polyamide reverse osmosis membrane, its preparation method, and its applications are disclosed, belonging to the field of membrane separation technology. The membrane comprises a porous support layer and a polyamide selective layer on its surface. The polyamide selective layer is covalently grafted with monoamine-terminated hyperbranched polyglycerol. The monoamine-terminated hyperbranched polyglycerol is grafted into the polyamide network through the reaction of its terminal primary amine groups with acyl chloride monomers during interfacial polymerization. This enriches the multi-hydroxyl branched structure of the hyperbranched polyglycerol on the membrane surface, forming a stable hydrophilic antifouling structure. The aforementioned long-lasting antifouling polyamide reverse osmosis membrane, its preparation method, and its applications result in a membrane with long-lasting and stable antifouling performance, strong hydrophilicity, and a simple preparation process, making it easy to industrialize.

This application provides a polymer brush, its preparation method, and its application in fluid drag reduction. The preparation method includes: preparation of an initiator layer; preparation of a PNIPAM brush: under a nitrogen atmosphere, N-isopropylacrylamide, pentamethyldiethylenetriamine, and acrylic acid are added to a mixed solvent of methanol and deionized water, and then cuprous bromide is added to obtain a polymerization reaction solution. A substrate material coated with an initiator layer is immersed in the polymerization reaction solution to perform a SI-ATRP reaction, and a PNIPAM brush is obtained on the surface of the substrate material. Preparation of a DM-PNIPAM brush: 4-dimethylaminobutamine and an activator are dissolved in N,N-dimethylformamide to obtain a modified solvent. The substrate material grafted with the PNIPAM brush is immersed in the modified solvent and reacted to obtain the polymer brush, i.e., the DM-PNIPAM brush. The polymer brush provided by this application improves its stability and durability as a drag-reducing agent in fluid drag reduction.

The application belongs to the field of membrane separation technology, and particularly relates to a novel high desalination rate anti-pollution reverse osmosis membrane material and a preparation method thereof. The preparation method comprises the following steps: contacting a porous support membrane with an aqueous solution containing mixed polyamine monomers and amine-modified nano-silicon dioxide, and then interfacially polymerizing with an oil phase solution containing mixed polyacyl chloride monomers to form a polyamide separation layer; then coating a sulfonated polyether sulfone coating solution to form a first modified layer; and finally coating a reaction solution containing modified polyethyleneimine, carboxylated graphene oxide and a crosslinking agent to form a second modified layer. By compounding aromatic and alicyclic polyamines, and combining amine-modified nano-silicon dioxide anchored in the polyamide network to form a dense separation layer, high desalination rate is ensured; by chemical bonding between the sulfonated polyether sulfone layer and the modified polyethyleneimine / carboxylated graphene oxide / crosslinking agent layer, a stable double-layer modified structure is constructed, and excellent anti-pollution performance is given to the membrane surface. The obtained membrane material has high desalination rate, strong anti-pollution property and stable structure.