8results about How to "Promote polymerization" patented technology

This invention provides a dielectric ion exchange membrane, its preparation method, and its application, relating to the field of membrane material preparation technology. The dielectric ion exchange membrane includes a substrate and an ion exchange membrane coated on the surface of the substrate. The ion exchange membrane comprises polyvinyl alcohol, an ion system, a UV-curable monomer, and a photoinitiator. By using UV curing technology, the crosslinking process and solvent evaporation can be precisely controlled during membrane formation, ensuring a smooth membrane surface and avoiding membrane curling caused by uneven shrinkage. The introduction of the UV-curable monomer is to form a crosslinked network under UV irradiation, inhibiting macroscopic structural flow and creep of the ion exchange membrane during film formation and service, improving the mechanical stability of the membrane, and forming a stable crosslinked structure, thereby forming a structurally stable dielectric ion exchange membrane and effectively preventing membrane curling during drying.

This invention discloses a method for purifying 2,5-furandicarboxylic acid (FDCA), belonging to the field of chemical technology. The purification method includes the following steps: crude 2,5-furandicarboxylic acid is subjected to alkali dissolution, oxidation, acidification, stirring, pulping, washing, and drying to obtain pure 2,5-furandicarboxylic acid. In the acidification crystallization process and the pulping and washing process, by selecting appropriate conditions such as the acidification reaction temperature, the oxygen content of the oxidation gas, the pulping and washing temperature, and the pulping and washing time, the purity of the obtained FDCA can reach 99.99%. Moreover, no organic solvents are used, meeting the requirements of polymerization-grade products. Furthermore, and more importantly, the FDCA product obtained by this invention has excellent particle characteristics, high flowability, and high bulk density, which is highly beneficial for downstream polymerization reactions and also facilitates the packaging and transportation of the FDCA product.

This invention belongs to the field of gold extraction agent technology, specifically relating to a method for preparing a gold extraction agent. The invention provides a method for preparing a gold extraction agent, comprising the following steps: mixing sodium cyanate and iron powder, and carrying out a melt catalytic reaction to obtain the gold extraction agent. This invention uses iron powder as a catalyst, which can effectively promote the polymerization reaction of sodium cyanate. During the catalytic polymerization process, iron atoms can break the carbon-nitrogen triple bond in sodium cyanate into a carbon-nitrogen double bond, with one end of the carbon-nitrogen double bond linked to a sodium atom. The obtained gold extraction agent does not contain free cyanide ions and is therefore non-toxic. In application, the sodium in the obtained gold extraction agent can displace gold in gold ore, thus playing a role in gold refining. Test results from the embodiments show that the gold extraction efficiency of the gold extraction agent provided by this invention is comparable to that of sodium cyanide, and it is safe, environmentally friendly, and non-toxic.

This invention relates to the field of phenolic resin technology, specifically to a method and apparatus for producing phenolic resin. The method involves adding phenol, cresol, tert-butylphenol, and cashew phenol to a mixing tank and mixing them evenly to form a mixed phenol. The mixed phenol is then mixed with an alkaline solution in a mixer to obtain a mixed liquid. The mixed liquid is then reacted with an aqueous formaldehyde solution in a first circular reactor to obtain a prepolymer liquid. The prepolymer liquid is then reacted with trimethylhydroxyethyl ethylenediamine in a second circular reactor to obtain phenolic resin. The mixing tank, mixer, first circular reactor, and second circular reactor are connected sequentially. The phenolic resin production method and apparatus provided by this invention increase the contact area and heat dissipation effect of the materials during the reaction process, promoting rapid reaction and driving the upgrading of phenolic resin towards high performance and environmental friendliness, producing high-solids, low-viscosity phenolic resin products.

The application discloses a kind of polybenzodifuranone and its constant potential polymerization preparation method, belong to organic conductive polymer material preparation technical field, benzodifuranone (BFDO) and supporting electrolyte are dissolved in polar aprotic solvent, and electrolyte is obtained by mixing uniformly;With platinum metal electrode as working electrode and counter electrode, with saturated calomel electrode as reference electrode, three electrodes are connected with direct current power supply and are placed in the electrolyte, in air atmosphere, electrochemical polymerization reaction is carried out using constant potential method;After reaction, the reaction liquid is extracted and filtered, dried, to obtain polybenzodifuranone (PBFDO).The application uses constant potential electrochemical polymerization method, n-type conductive polymer polybenzodifuranone can be synthesized in air atmosphere in one step, without catalyst, high-temperature anaerobic environment and complex post-processing, the product conductivity is 1.157-18.28 S / cm.Process simplification, low cost, process controllable, can realize green scale preparation and industrialization application.

This invention provides a catalyst for the polymerization of high molecular weight polyphenylene sulfide with high solvent recovery rate, a polymerization method thereof, and the polyphenylene sulfide obtained therefrom, comprising the following steps: (1) adding a sulfur-containing compound, catalyst, reaction solvent, and azeotropic dehydrating solvent to a reaction vessel, dehydrating the mixture, and then adding p-halobenzene; (2) performing a first-stage prepolymerization reaction, generating a prepolymer after 1-4 hours; (3) performing a second-stage polymerization reaction, generating a polymer after 2-6 hours; (4) after the reaction is completed, cooling to 120-160℃, filtering and separating to obtain high molecular weight polyphenylene sulfide. A compound containing carboxyl or hydroxyl functional groups is used as a catalyst to form a complex with sodium ions on sodium sulfide, exposing the sulfide ions and enhancing their nucleophilic attack ability, thus promoting the polymerization reaction. The addition of an azeotropic dehydrating solvent to the system inhibits the hydrolysis of N-methylpyrrolidone, improving the solvent recovery rate.

The invention discloses a device for aging yellow rice wine by using a deep ultraviolet LED (Light Emitting Diode) and a control method thereof. The device comprises a deep ultraviolet light source, an irradiation chamber, a wine inlet, an exhaust window, a temperature control system and a control unit, the deep ultraviolet light source is fixed to the top of the irradiation chamber, and an LED is provided with an AlN ceramic substrate and an aluminum radiator; the temperature control system monitors and adjusts the yellow wine temperature; the control unit controls on and off of the LED, irradiation time and temperature adjustment. The method comprises the steps that yellow wine to be aged is filtered and then placed in a closed container; a deep ultraviolet LED is adopted to irradiate the yellow wine, the LED emission wavelength is 255-275 nm, the irradiation intensity is 30-50 W / cm < 2 >, the irradiation distance is 10 cm, and the irradiation time is 10-30 days; the temperature is kept at 20-25 DEG C in the irradiation process; and after the irradiation is completed, standing and packaging in a dark environment. According to the method, the yellow wine can be naturally aged for 1-5 years within 10-30 days, the aging time is remarkably shortened, the storage cost is reduced, and the aging effect is stable and controllable.

The application discloses a kind of high durability alkali-activated iron tailings sand solidified soil and preparation method thereof, and the solidified soil includes solid aggregate component and composite modified curing agent component;Solid aggregate component includes iron tailings sand, clay and calcareous hydraulic cementitious material;Composite modified curing agent component includes alkali-activated geopolymer base material and nano silicon-based modifier;The solidified soil has the dense three-dimensional network gel structure generated by mixing reaction of modified activation solution formed by pre-dispersing nano silicon-based modifier in alkaline activation solution and solid aggregate component and alkali-activated geopolymer base material.The purpose of the application is to provide a kind of high durability alkali-activated iron tailings sand solidified soil and preparation method thereof, by introducing specific modified auxiliary agent and optimizing iron tailings sand, clay ratio, significantly improve the mechanical properties, durability and construction adaptability of solidified soil.