8 results about "Functionalized polystyrene" patented technology

The invention relates to a method for the separation of two hydrophilic neutral oligosaccharides from each other with a chromatography on a bromine functionalized polystyrene cross-linked with divinylbenzene (BPS-DVB) stationary medium.

The invention belongs to the technical field of amino acid production, and discloses a method for separating and purifying glutamic acid, which comprises the following steps: separating and purifying a glutamic acid crude product by using a weak cation exchanger to obtain a medicinal glutamic acid refined product; the weak cation exchanger is functionalized polystyrene microspheres, and the glutamic acid crude product contains heteroamino acid. The method can effectively separate and remove heteroamino acid, is simple in process and low in cost, and completely meets the standard of medicinal glutamic acid.

This invention provides an amino-functionalized transparent impact-resistant isophthalic resin and its preparation method, belonging to the field of functional polymer material synthesis. The amino-functionalized transparent impact-resistant isophthalic resin is a multi-component copolymer of styrene, isoprene, and a p-chloromethylstyrene derivative monomer containing tertiary amine functional groups. The preparation method employs a classic anionic polymerization method. First, an amino-functionalized polystyrene active segment SN1 is prepared. Then, it is added to a styrene / isoprene mixed monomer for a two-stage reaction to obtain a block copolymer segment SN1-SP with alternating styrene / isoprene sequences. Finally, styrene and the amino-functionalized monomer are added for a three-stage reaction or directly coupled with a coupling agent to obtain a special block copolymer SN1-SP-SN2, successfully yielding the amino-functionalized transparent impact-resistant isophthalic resin. By controlling the length of the special alternating sequence molecular chain and the block composition ratio, the mechanical properties of the product are controlled. Simultaneously, the tertiary amine polar groups are quantitatively introduced into the molecular chains, successfully achieving high impact resistance and transparency, and also enhancing the resin polarity. Using a lithium-based polymerization method, the resin particles are free of monomer and harmful impurities.

The invention provides a preparation method and a bromination method of low-molecular-weight functionalized polystyrene, and belongs to the technical field of high polymer materials. The nickel complex is used as a main catalyst, copolymerization of styrene and polar styrene is successfully catalyzed through aluminum alkyl activation, low-molecular-weight functionalized polystyrene is obtained, and the polar monomer insertion rate of the low-molecular-weight functionalized polystyrene can reach 60% at most. The system does not need complex ligand design and is low in cost, the yield of the obtained low-molecular-weight functionalized polystyrene is high, the low-molecular-weight functionalized polystyrene obtained through a copolymerization method can be further used for preparing low-molecular-weight functionalized brominated polystyrene, and the low-molecular-weight functionalized brominated polystyrene has excellent thermal stability and can be used for preparing the low-molecular-weight functionalized brominated polystyrene. Polar groups in the low-molecular-weight functionalized brominated polystyrene have stronger interaction with a polar polymer matrix, so that the low-molecular-weight functionalized brominated polystyrene shows better dispersion performance and interfacial compatibility in the polar polymer matrix, and the polar polymer matrix is endowed with excellent flame retardant property.

The invention discloses a nano-microsphere for in-well fracturing. The nano-microsphere is prepared from the following components in parts by mass: 1 part of functionalized polystyrene microspheres; 3 to 6 parts of a polyhydroxy compound; 0.005 to 0.03 part of concentrated sulfuric acid; 5 to 10 parts of water; 3-5 parts of toluene; the invention also discloses a preparation method of the nano-microsphere for in-well fracturing, which comprises the following steps: weighing the material of the nano-microsphere for in-well fracturing, sequentially adding the toluene, the polyhydroxy compound, the functionalized polystyrene microsphere and the concentrated sulfuric acid into a reaction kettle with a water segregator, mixing and stirring for 5-7 hours at 90-120 DEG C, and then cooling to room temperature to obtain the nano-microsphere for in-well fracturing. And after reduced pressure distillation, adding water for dilution and stirring to obtain the nano-microspheres for in-well fracturing. The problem that in the prior art, when fracturing is conducted in a well, fracturing fluid and rock are prone to being adsorbed, the fracturing fluid cannot be discharged in time, fractured cracks are blocked, and the fracturing effect is affected is solved.

The application discloses a kind of composite temperature-resistant coating lithium electric diaphragm and preparation method thereof, belong to lithium ion battery diaphragm technical field.The diaphragm is coated with ternary composite coating on the surface of polypropylene base material, which includes polymethyl methacrylate, surface phosphate-modified lithium zirconium phosphate (modified LZP) and surface boric acid functionalized polystyrene microspheres (PS / BA).Boric acid groups on the surface of PS / BA microspheres and phosphate groups on the surface of modified LZP form dynamic borate ester bond through reversible reaction, thereby constructing "self-adapting interface phase" in the coating.The structure simultaneously significantly enhances the interface bonding strength of coating and the dimensional stability at high temperature.The prepared diaphragm has a heat shrinkage rate of less than 4% at 150℃, the peeling strength is significantly improved, and good ionic conductivity is maintained.The application has low raw material cost, good process compatibility, and provides an effective solution for improving the safety and comprehensive performance of lithium ion batteries.

The invention relates to the technical field of pyrite mining, in particular to a composite flotation agent for pyrite mining and a preparation method and application thereof.The composite flotation agent is prepared from, by mass, 40-60 parts of N, N-diethyldithiocarbamate, 20-30 parts of sodium isoamyl xanthate, 5-10 parts of imidazole functionalized polystyrene nanoparticles, 8-15 parts of water glass, 2-5 parts of methyl isobutyl carbinol and 10-20 parts of deionized water. The prepared composite flotation agent is synergistic in component, high in selectivity, resistant to slime covering, low in VOCs, stable and efficient; the method is controllable in process, uniform in dispersion, high in product stability and suitable for industrial production; the method can adapt to complex sulphide ore mining, the grade and the recovery rate of pyrite concentrate are remarkably improved, and green and efficient separation is achieved.

The invention relates to the technical field of adsorption resin, and provides germanium adsorption functional resin as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, putting chloromethylated polystyrene microspheres, an aqueous solution of trimethylamine and N, N-dimethylformamide into a reaction container for ultrasonic treatment to obtain a reaction mixture; and S2, filtering the reaction mixture in the step S1 to obtain solid resin, cleaning the solid resin, and drying to obtain the resin loaded with the ionic liquid. According to the preparation method, trimethylamine is taken as a functional reagent and is subjected to rapid nucleophilic substitution with chloromethyl functionalized polystyrene, and ultrasonic treatment is assisted, so that the exposure degree of active sites in the resin is improved, deep combination of an organic reagent and the active sites in the resin is promoted, and efficient loading of functional groups is realized; the enrichment capability on low-concentration germanium is obviously improved.