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

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 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 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.