22results about How to "Promote polymerization" patented technology

The invention discloses a preparation method of high-efficiency fusible polytetrafluoroethylene (PFA), and relates to the technical field of fluorine-containing polymers. The preparation method comprises the following specific steps: adding high-purity water into a polymerization kettle, starting stirring, adding a surfactant, a dispersing aid, a chain transfer agent and a perfluoroalkyl vinyl ether monomer, controlling the temperature and pressure of the polymerization kettle, adding an initiator solution into the reaction kettle, and initiating a copolymerization reaction; the preparation method comprises the following steps: continuously adding a gas mixture of tetrafluoroethylene and perfluoroalkyl vinyl ether into a polymerization kettle after a polymerization reaction is started, continuously adding an initiator solution into a reaction kettle at a constant speed at the same time, and recovering unreacted monomers in the polymerization kettle after the reaction is finished to obtain a fusible polytetrafluoroethylene (PFA) resin emulsion. The method overcomes the problem of low polymerization efficiency caused by low filling coefficient and long solvent recovery period of the original solvent phase PFA polymerization reaction, and improves the utilization rate of raw materials.

The invention relates to the technical field of metal corrosion prevention, and particularly discloses a titanium alloy bolt surface aluminum coating coating method capable of improving corrosion resistance. A titanium alloy bolt surface aluminum coating coating method capable of improving corrosion resistance comprises the following steps that a titanium alloy bolt is subjected to cleaning and sand blasting pretreatment; the preparation method comprises the following steps: adding the aluminum powder and the benzaldehyde resin into the solvent, mixing and stirring, continuously adding the polytetrafluoroethylene micro powder, the diluent and the self-repairing microcapsule prepared in advance, and continuously stirring until the mixture is uniform, the prepared anti-corrosion aluminum coating is sprayed to the surface of the titanium alloy bolt, after the surface of the coating is dried, curing is conducted for 55 min to 65 min at the temperature of 180 DEG C to 200 DEG C, and the aluminum coating is obtained; the self-repairing microcapsule is prepared by mixing a microcapsule A and a microcapsule B, wherein the microcapsule A is prepared by wrapping a polyurethane prepolymer with polyvinyl butyral as a shell layer, and the microcapsule B is prepared by wrapping a curing agent support with polyvinyl butyral as a shell layer. The aluminum coating prepared through the method has the advantages of being good in corrosion resistance and durability.

The invention relates to preparation of an intelligent self-repairing iron-nickel-based corrosion-resistant alloy material, which comprises the following steps: synthesis of acrylic resin, preparation process of microcapsules, pretreatment of a magnesium alloy substrate, preparation of an acrylic resin coating, preparation of an electro-deposition iron-nickel alloy, preparation of a precursor ceramic repairing agent, and preparation of the intelligent self-repairing iron-nickel-based corrosion-resistant alloy material. An electrodeposition method, a solution polymerization method and a coating preparation method are creatively combined, the prepared intelligent self-repairing iron-nickel-based corrosion-resistant alloy material is a high-strength and high-hardness alloy material, and the intelligent self-repairing iron-nickel-based corrosion-resistant alloy material has the advantages of self-repairing function, corrosion resistance, wear resistance and high hardness.

The invention relates to the field of photocatalysis and high polymer material preparation, and discloses preparation of a heterogeneous photocatalyst and application of the heterogeneous photocatalyst in controllable free radical polymerization, and the preparation method comprises the following steps: step 1, the adopted photocatalyst has the following structure: a conjugated structure unit containing an electron-donating group and an electron-withdrawing group is connected; according to the efficient cross-linking conjugated catalyst, rapid and controllable free radical polymerization is achieved under the condition of low catalyst dosage, high production efficiency and low production cost are achieved, a deoxygenization device and deoxygenization operation can be omitted through the light-induced controllable free radical polymerization method, polymerization reaction can be accelerated in the presence of oxygen, and the polymerization efficiency is improved. According to the present invention, the heterogeneous photocatalyst is adopted as the catalyst, good polymerization controllability is maintained, the catalyst can be further recycled, the pollution problem of the traditional photocatalyst to the product is avoided, and the light-induced controllable free radical polymerization using the heterogeneous photocatalyst comprises atom transfer free radical polymerization (ATRP) and reversible addition-fragmentation chain transfer (RAFT) polymerization.

The invention discloses an in-situ repair reagent for reverse osmosis membrane and an in-situ repair method for reverse osmosis membrane. The reverse osmosis membrane repair agent is composed of a repair agent A and a repair agent B, wherein the repair agent A is a mixed solution of dopamine hydrochloride, catechol, and tannic acid with a self-polymerizing polymer; and the repair agent B is a tris(hydroxymethyl)aminomethane hydrochloride) solution. The repair agent can perform in-situ repair on a reverse osmosis membrane with a desalination rate of 60-90%. The method can restore a reverse osmosis membrane with a desalination rate of 60-90% to a desalination rate of more than 95%, and the water flux of the repaired membrane is close to that of the original membrane. The repair agent has low cost, is environmentally friendly, and has a stable repair effect.

The present invention relates to a method for preparing a graphite phase carbon nitride composite nano silicon negative electrode material, and belongs to the technical field of lithium ion batteries. The present invention discloses a method for preparing a graphite phase carbon nitride composite nano silicon negative electrode material, which includes the following steps: A1: carbon nanotubes are placed in a mixed acid for infiltration treatment, and after solid-liquid separation, the solid is washed with deionized water to adjust the pH value to neutral, and then dried to obtain oxidized carbon nanotubes; A2: oxidized carbon nanotubes and modified silicon powder are added to a cyanuric acid solution, stirred and mixed to form a mixed solution, the mixed solution is poured into a melamine solution, stirred and placed to precipitate, and the filtered precipitate is washed with deionized water and dried to form a solid precipitate; A3: the solid precipitate is moved to a tubular furnace, argon gas is introduced, the temperature is increased and kept warm, and then cooled to obtain a graphite phase carbon nitride composite nano silicon negative electrode material. The cycle performance, service life and conductive performance of the silicon negative electrode material are improved by the above method.

The invention discloses a preparation method of a foam inhibiting and defoaming agent for a polyvinyl alcohol (PVA) aqueous solution, which comprises the following preparation steps: S1, preparing raw materials including ethylene oxide, propylene oxide, polyethylene glycol (PEG), absolute ethyl alcohol, a catalyst and silicone oil; according to the method, organic pollutants in the reactor are effectively removed, microbial cleaning not only has high selectivity and environmental protection property, but also can be carried out under mild conditions, damage of chemical cleaning agents to equipment is avoided, the organic pollutants in the reactor can be more thoroughly removed, and the method is suitable for industrial production. Residues possibly generated by a traditional chemical cleaning method are reduced, the cleaning effect is improved, the method does not depend on harmful chemicals, potential hazards to the environment and personnel are reduced, the requirement of green chemistry is met, the inner wall of the reactor is fully cleaned, residues of previous reactants or catalysts are avoided, the reaction purity can be improved, and the production cost is reduced. Generation of by-products is reduced, and the stability and quality of the final product are improved.

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.

The invention discloses a preparation method of anionic high-solid-content styrene-butadiene latex. The raw materials of the anionic high-solid-content styrene-butadiene latex are as follows, including 100-200 parts by mass of butadiene monomer, 40-80 parts by mass of styrene monomer, 4-8 parts by mass of anionic emulsifier, 1-3 parts by mass of molecular weight regulator, 10-17 parts by mass of defoamer, 2-3 parts by mass of anionic agglomerating agent, 5-13 parts by mass of anti-skinning agent, 200-800 parts by mass of deionized water, 2-4 parts by mass of dispersant NNO, 1-2 parts by mass of pH regulator, and 1-5 parts by mass of phosphoric acid. Due to the special electronegativity of anionic emulsifier, anionic emulsifier is used as both emulsifier and initiator, and in the polymerization process of styrene-butadiene rubber emulsion, the polymerization reaction is promoted, and then adsorbed on the surface of latex particles, and the stability of styrene-butadiene latex is increased. While rationally controlling various parameters of the preparation process, defoamer and anti-skinning agent are added to solve the problems between high-temperature and efficient dehydration and latex skinning, glue hanging, and foaming.

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.

The invention discloses an ultraviolet curing device and a continuous ultraviolet curing furnace, and relates to the technical field of battery production. According to the ultraviolet curing device, ultraviolet light emitted by the mercury lamp is reflected through the semi-elliptical reflecting lampshade, so that the energy of the ultraviolet light is concentrated on a battery piece, the illumination energy density is improved, the curing time is shortened, the curing efficiency is improved, the curing effect is ensured, and the productivity is improved; the high illumination energy density means that the illumination intensity on the unit area of the battery piece is higher, so that the photoinitiator in the ultraviolet insulation paste can generate living free radicals more quickly, the polymerization reaction is accelerated, and the ultraviolet insulation paste is suitable for scenes needing quick curing; meanwhile, hot air in the reflecting lampshade is quickly exhausted through the exhaust mechanism, and the battery piece is air-cooled through the air cooling mechanism, so that the temperature of the battery piece is effectively reduced, a passive film layer is prevented from being damaged, and the quality of the battery piece is ensured.

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 utility model relates to the technical field of preparation devices, in particular to a polymer retanning agent preparation device. In order to solve the problems that polymers generated in the polymer reaction process may be attached to the inner wall of a container to form dirt or sediment, and cleaning and recycling of the container are affected, the following technical scheme is provided: the device comprises a reaction tank which is used for reaction and is provided with an upper opening, and the bottom of the reaction tank is provided with a discharge port and a valve; a supporting seat is also mounted at the bottom of the reaction tank; the stirring assembly is arranged on the reaction tank and is used for promoting polymerization reaction; the cleaning assembly is used for cleaning the inner wall of the reaction tank; and the switching mechanism is arranged between the stirring assembly and the cleaning assembly and used for switching the stirring assembly and the cleaning assembly. According to the utility model, after preparation, the state can be switched so as to clean the interior of the reaction tank, dirt and precipitates remained on the inner wall of the reaction tank are effectively removed, and the purity and quality of the next batch of reaction are ensured.

The utility model discloses a preparation machine of a concrete water-retaining agent, which belongs to the related technical field of water-retaining agent production and comprises a bottom plate, a support frame arranged on the bottom plate, inclined rods arranged on two sides of the support frame, limiting blocks movably arranged on the inclined rods, a preparation barrel arranged in the limiting blocks and a stirring block arranged in the preparation barrel in a lifting manner. The stirring block is arranged on a rotating shaft, the upper end of the rotating shaft penetrates through the cover body and then is connected with a second motor, the second motor is arranged in a lifting plate, the lifting plate is connected with a lifting assembly through a connecting block, and a discharging pipe is arranged at the side end of the preparation barrel. The water-retaining agent stirring device solves the technical problem that the quality and the efficiency of a water-retaining agent are affected due to non-uniform stirring during stirring in the prior art.

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 invention relates to the technical field of photoresist, in particular to a 3, 4-dihydroxystyrene polymer, preparation thereof and a photoresist composition. The 3, 4-dihydroxy styrene polymer is prepared from the following raw materials: 3, 4-diacetoxystyrene, a styrene monomer, tert-butyl acrylate and an initiator; the mass ratio of the 3, 4-diacetoxystyrene to the styrene monomer to the tert-butyl acrylate to the initiator is (80-100): (5-20): (10-20): (5-10). The preparation method of the 3, 4-dihydroxystyrene polymer comprises the following steps: dissolving 3, 4-diacetoxystyrene, a styrene monomer, tert-butyl acrylate and an initiator in a polar organic solvent to obtain a mixed solution; preheating a polar organic solvent to 50-80 DEG C, dropwise adding the mixed solution into the preheated organic solvent, and carrying out a constant-temperature reflux reaction at 50-80 DEG C for 2-30 h to obtain an emulsion; and decanting the emulsion, hydrolyzing, filtering, washing and drying.

The invention discloses an antibacterial hemostatic bandage and a preparation method thereof, and relates to the technical field of medical supplies. When preparing the antibacterial hemostatic bandage, the present invention first performs surface modification of nano zinc oxide with organosiloxane to obtain modified nano zinc oxide; chitosan is reacted with D, L-lactide to obtain grafted polylactic acid chitosan; grafted polylactic acid chitosan is first reacted with chloroacetyl chloride, and then with oil-based dimethyl tertiary amine to obtain hydrophobically modified chitosan; hydrophobically modified chitosan, modified nano zinc oxide, and vinyl polysiloxane are prepared into a dispersion in dichloromethane, sprayed on a polypropylene non-woven fabric, and immersed in a ferric chloride solution after irradiation cross-linking, and an antibacterial hemostatic bandage is obtained after drying. The antibacterial hemostatic bandage prepared by the present invention has a faster hemostatic speed, good antibacterial property, low blood loss rate, and is easy to remove when replaced due to the surface super-hydrophobicity, reducing secondary injury and secondary bleeding.

The invention belongs to the technical field of functional resin, and discloses functional resin capable of being polymerized and produced at normal temperature and a preparation method thereof, and the preparation method comprises the following steps: step 1, preparing and mixing raw materials; 2, adding a catalyst; step 3, starting a reaction; step 4, reaction monitoring: analyzing the composition and property of a reaction system by sampling every 1 hour so as to judge the reaction process and the resin quality; step five, treatment and product preparation: when the reaction reaches a preset degree, adding a terminating agent to terminate the polymerization reaction, and controlling the stirring speed to be 200-300 revolutions per minute and the stirring time to be 10-15 minutes; step 6, product separation: filtering and washing the reaction liquid to remove impurities such as unreacted raw materials, the catalyst and the solvent; the invention not only solves the technical problem of normal temperature polymerization production of functional resin, but also provides a new thought and technical path for realizing green, efficient and sustainable development of resin materials.

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.