34results about How to "Slow down aggregation" patented technology

The invention provides a silicon-based composite material, a preparation method and an application thereof. The silicon-based composite material comprises nanometer silicon particles and polyaniline cladding layers cladded on surface of the nanometer silicon particles, and Si-C covalent bonds are formed between the nanometer silicon particles and the polyaniline coating layers. The preparation method of the silicon-based composite material comprises carrying out a diazotization reaction of P-phenylenediamine (H2N-Ar-NH2) in the presence of nitrite under an acidic condition to generate diazonium salts; adding the nanometer silicon particles into a solution of a complete diazotization reaction for a replacement reaction to obtain nanometer silicon precursors with aniline monomers connected to the surfaces of the nanometer silicon particles through the Si-C covalent bonds; adding the nanometer silicon precursors into a microemulsion mixed from an oil phase and a water phase, adjusting a pH value of the solution, adding the aniline monomers; and adding an initiator enabling polymerization of the aniline into the microemulsion for an aniline polymerization reaction, thereby obtaining the silicon-based composite material with polyaniline-cladded nanometer silicon particles. The silicon-based composite material provided by the invention can improve a cladding effect.

The main goal of the present invention is the development of a polymerizable material for isolation and protection of the gums and generally the soft tissues of the oral cavity. For better protection during various procedures of the dental surfaces. The composition of the material can contain many other substances that strengthen its qualities and protective action. Such substances can be various substances that have antioxidative, sedative, anti-inflammatory, analgesic, anti-irritant action etc.

The present invention relates to a separation method of styrene, and is aimed at mainly resoving the problems of that existent separation equipment is high in investment and easy to be damaged, evaporation effect is poor and styrene loss is high. Said invention adopts a technical scheme, and its characterized by that a dehydrogenation liquor is used, and fed into crude styrene separation tower, after separation the tower top product is passed through the ethylbenzene recovery tower to make separation to obtain product flow containing toluene and benzene, and the ethylbenzene is circulated in reaction zone, then the tower bottoms of crude styrene separation tower can be fed into the fine styrene separation tower to make separation and obtain fine styrene from tower top, and the tower bottom tar material containing styrene is passed through adiabatic flash tank to make flash evaporation.

The invention provides a method for preparing an alumina flocculant inverse microemulsion and the alumina flocculant inverse microemulsion prepared by the method. A stable sodium acrylate-acrylamide inverse microemulsion was prepared by adding a self-made graft emulsifier and other emulsifiers. During the polymerization process, the self-made grafted emulsifier added has a branched chain structure at the lipophilic end, which stabilizes the encapsulation of micelles and droplets, and at the same time slows down the polymerization rate, thereby increasing the molecular weight of the product. The inverse microemulsion obtained by polymerization with low oil-water ratio and high solid content has a long stable storage period.

In order to overcome the problems of drop in withstand voltage and increase in leakage current caused by metal foil oxide film corrosion in existing electrolytic capacitors, the present invention provides a composition comprising polymerized monomers, phosphoric acid ester compounds and end-capping agents; Polymerized monomers include 3,4-ethylenedioxythiophene polymerized monomers; the end-capping agent includes compounds shown in structural formula 1; wherein, R 4 selected from H or hydrocarbon groups with 1 to 6 carbon atoms. At the same time, the present invention also discloses a capacitor polymer obtained by polymerizing the above composition and a capacitor comprising the above capacitor polymer. The polymer obtained by polymerizing the composition provided by the invention can repair and protect the oxide film on the metal foil, and significantly reduce the occurrence of damage to the oxide film on the capacitor metal foil.

The invention discloses a preparation method of the poly-dicyclopentadiene / montmorillonite nanocomposites. The support catalysts is prepared through the complex compound compounded by the compound with hydroxide radical and the tungsten hexachloride attaching to the organic montmorillonite, and the complex compound comprises the paratert-butyl phenol, quadruple ((Beta-(3, 5-tert-butyl -4- hydroxyphenyl) monoprop) pentaerythritol ester or 2-hydroxy-4-n-octyloxybenzophenone, etc. The polymerization of the dicyclopentadiene is catalysed through the in situ polymerization model by the catalyst, the interlayer spacing is increased when the dicyclopentadiene monomer polymerizing in the interlayer of the montmorillonite, the interlayer of the montmorillonite is peeled by the heat produced in thereaction, the peeled interlayer of the montmorillonite is scattered in the poly-dicyclopentadiene, and the poly-dicyclopentadiene / montmorillonite Nanocomposites is produced, and then a model is prepared by the reaction injection molding method. The composites are showed with nanocomposites structure through the X-ray diffractogram.

The invention discloses an organic-inorganic hybridized monolithic column as well as a preparation method and an application thereof. The monolithic column comprises a silica gel framework and has a typical reversed phase chromatographic mechanism through introducing octyl. According to the monolithic column, tetraethoxysilane is served as an inorganic monomer, octyltriethoxysilane is served as an organic-inorganic hybridized monomer, a binary porogenic agent Pluronic F127 / lauryl amine is used for substituting for the conventional single porogenic agent-lauryl amine, methanol / water is served as a solvent, hydrochloric acid and lauryl amine are used as acid-base regulators, and the monolithic column is synthesized by adopting a double-step acid-base sol-gel method. The monolithic column obtained by the method is of an ideal double-pore structure, a preparation process is simple and easy to operate, and high column efficiency is obtained. Through utilizing the synthesizing method of the monolithic column, naphthalene is served as an analyte, and the height of the obtained column plate is reduced to 20-30 micrometers from 70-80 micrometers. The hybridized monolithic column can be used for the reversed phase chromatographic separation and enrichment of various hydrophobic substances.

The invention discloses a color toner, which comprises the following components in parts by weight: 60-80 parts of styrene; 15-25 parts of butyl acrylate; 3-7 parts of composite wax; 3-6 parts of pigment; 0.2~1.5 parts of agent; 1~2 parts of ammonium persulfate; 0.1~2 parts of molecular weight regulator; 1.0~3.0 parts of surfactant; 1~4 parts of silicon dioxide; or two or more of C80 paraffin waxes; the present invention can properly reduce the polymerization speed by adding composite wax in the emulsion preparation stage, compared with the use of a single wax, so that its toughness and printing durability are improved; in addition, the composite wax It can reduce the cost and make the color toner have better emulsification, better gloss, better hardness and better stability; and the particle size distribution is narrow, the average particle size D50 is 5~8μm, making the particle size diameter is easy to control.

The invention discloses a method for extracting butadiene from dimethylfomamide and a mixture thereof. The dimethylfomamide and the mixture thereof consist of dimethylfomamide and a low-boiling-point solvent, wherein the content of the dimethylfomamide is 50-99 percent by weight; the low-boiling-point solvent is a solvent of which the boiling point is lower than that of the dimethylfomamide and is 50-153 DEG C, and is preferably one or more of acetonitrile, butanone and acetone; and the dimethylfomamide and the mixture thereof are taken as extracting agents of butadiene in the method. The method comprises a first extractive distillation step, a second extractive distillation step, a refining step and the like. Due to the adoption of the method disclosed by the invention, the selectivity of the solvent can be increased, the tower plate number and the solvent ratio of an extractive distillation tower can be greatly lowered, and the equipment investment and the operating cost are lowered.

The invention discloses a method for synthesizing cyclodextrin-modified dopamine derivatives. Pyridine and potassium iodide are used as catalysts, vacuumize the reaction system to reach an anhydrous and anaerobic state; then add anhydrous N,N-dimethylformamide and anhydrous methanol respectively, stir, dissolve the solid sample, adjust the pH to weak acidity, and place React at 80-100°C for 12-24 hours to obtain a reaction mixture, perform rotary evaporation to remove the solvent, and elute through column chromatography to obtain a mono-6-deoxy-dopamine cyclodextrin derivative. The cyclodextrin-modified dopamine derivative synthesized by the present invention reduces the problem of uneven sedimentation of polydopamine on the surface of the material, has the excellent performance of realizing degradable performance in the living body, and overcomes the difficulty of combining oil-soluble pharmaceutical materials with hydrophilic ones. The combination of polydopamine makes it difficult to achieve drug fixation and sustained release.

The invention provides a liquid crystal polyester, a liquid crystal polyester composition and products made thereof. In the liquid crystal polyester provided by the present invention, it must contain repeating units derived from aromatic oxycarbonyl (I) and a small amount of aromatic dicarboxylic acid (IV), and may also contain repeating units derived from aromatic dioxy (II) and a repeating unit (III) derived from an aromatic dicarbonyl group; the molar ratio of the repeating unit composition satisfies the following conditions: the repeating unit (I) derived from an aromatic oxycarbonyl group, the repeating unit (II) derived from an aromatic dioxyl group ) and the repeating unit (III) derived from the aromatic dicarbonyl group and the sum of the three are 100mol%, wherein a small amount of aromatic dicarboxylic acid is introduced in the liquid crystal polyester, so that the excessive molar ratio of carboxyl groups in the liquid crystal polyester is 0.1- 5%, which is calculated by (carboxyl group-hydroxyl group) / hydroxyl group×100mol%; in the present invention, a small amount of excess aromatic dicarboxylic acid is introduced into the liquid crystal polyester preparation process, and the liquid crystal polyester prepared Has excellent anti-foaming properties and good melt discharge.

The present invention discloses a PBS resin composition and a preparation method thereof. The composition comprises: a. PBS resin; b. element titanium; c. element phosphorus, wherein a weight ratio range of titanium to phosphorus is 0.6-10:1, preferably 0.7-4:1, and more preferably 1.25-1.5:1. A weight content of the element titanium is 20-200 ppm, and a weight content of the element phosphorus is 15-70 ppm. By adding a titanium-containing compound and a phosphorus-containing compound and controlling the range of the weight ratio of the element titanium to the element phosphorus in the PBS resin composition to be 0.6-10:1, the present invention obtains a PBS resin composition. After treating in a 95° C.-distilled water bath for 12 hours and drying at 90° C. for 3 hours, a change of the melt flow index of the PBS resin composition is less than 50.0 g / 10 min, and the PBS resin composition possesses an obviously improved hydrolysis property.