114results about How to "Uniform polymerization" patented technology

The invention relates to a preparation method of a polyacrylonitrile carbon fiber with an evenly distributed copolymerization sequence. The preparation method comprises the following steps: determining the number of serially connected reactors; determining the ratio of fed materials of different areas in the third co-monomer zone; carrying out precipitation polymerization by taking water as the medium, drying so as to obtain polyacrylonitrile powder; dissolving the polyacrylonitrile powder to prepare a spinning solution, removing the bubbles from the solution, filtering, spraying, and curing to form primary fibers, washing and subjecting the primary fibers to a post treatment so as to obtain polyacrylonitrile-based carbon precursor fibers; and finally subjecting the precursor fibers to pre-oxidation, carbonation, and a post treatment so as to obtain the high performance carbon fiber. The preparation method adopts multi-grade serially-connected stirred tank polymerization reactors, and raw materials are supplemented in the third co-monomer zone according to a certain ratio in different areas so as to obtain a PAN copolymer with evenly distributed copolymerization sequence. Because the distribution uniformity of the copolymerization sequence of polyacrylonitrile precursor fibers is high, the possibility that fibers with a shell-core structure appear during the pre-oxidation process is small. Moreover, the diffusion of oxygen gas in the radical direction of fibers is also promoted, thus the pre-oxidation reactions can be stably carried out and the heat dissipation can be controlled so as to obtain carbon fiber with an excellent performance.

The invention belongs to the field of catalysts, and discloses a monatomic catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) synthesizing a SiO2-coated GO composite material by coating SiO2 nanospheres with graphene oxide; (2) synthesizing a SiO2-coated GO-coated PDA composite material by coating the SiO2-coated GO composite material with polydopamine; (3) synthesizing an RGO-coated NC composite material by coating reduced graphene oxide with nitrogen-doped carbon; and (4) synthesizing an RGO-coated NC/Pd monatomic catalystby loading the RGO-coated NC composite material with Pd monatoms. According to the preparation method disclosed by the invention, the overall process flow of the preparation method is set, and the reaction conditions and parameters of each key process step are improved, so that the dispersity, the catalyst activity and the cycling stability of metallic single atom can be effectively improved.

The invention discloses a preparation method and application of a fibrous catalyst. The preparation method comprises the following steps: (1) synthesizing a fiber @ polydopamine composite material; (2) preparing a fiber@ polydopamine-precious metal composite material; (3) finally obtaining the fibrous catalyst. The fibrous catalyst is applied to fixed beds. By using reaction materials which are low in cost and easy to get, the prepared fibrous catalyst is easy to separate and recover, can be applied to fixed beds, can be used for realizing continuous catalystic reaction, has positive effect for reducing the application cost of the catalyst and has the advantage of improving the production efficiency.

The invention discloses a multifunctional compound cellulose fiber and a preparation method thereof. By adoption of an advanced microcapsule preparation technique and modification of a cellulose fiber solution preparation process, a cellulose fiber is modified through polyvinyl alcohol, herba centellae, proteins and vitamins to obtain the multifunctional compound cellulose fiber by means of a cellulose fiber wet spinning process. The multifunctional compound cellulose fiber prepared according to the method is capable of meeting people's demands on moisture absorption, bacteria resistance, skin caring and the like of fibers, and a product is excellent in physical and mechanical performance and stable functionally and has a promising development prospect.

The invention relates to a resin lens with good coloring performance and high refractive index and a manufacturing method thereof, and the resin lens is characterized in that: the weight percentage ratio of chemical monomer, modifier, additive and initiator in the lens material is 85 to 92 : 5 to 12 : 2.0 to 8.0 : 0.20 to 0.30. The manufacturing method of the resin lens is characterized in that: when in material preparation, the main chemical monomer, the modifier, the additive and the initiator are fully mixed under the room temperature according to the mixture ratio, then stirring and heating are carried out in a hot water bath tank, a filter core with 0.1Mum is used for filtration, the vacuum pumping is further carried out for 40 to 60 minutes; the prepared materials are pressurized and poured into a closed mold through filter paper and a polytetrafluoroethylene filter film; when in polymerization process of the raw materials, a computer is adopted for the temperature control; the lens is carried out with the secondary curing after opening the mold and cleaning; the BPI staining test is carried out; the volume ratio of dye to deionized water is 3.5 to 5 : 1, the temperature is 90 to 97 DEG C, the coloring time is 20 to 30 minutes and the transmittance after the staining is 19 to 30 percent.

The invention discloses preparation of a fibrous catalyst loaded with metal nanoparticles and application. The preparation method comprises the following steps: adding metal salt into a solution system containing trihydroxy methyl aminomethane, fiber and dopamine hydrochloride to obtain mixed solution, then stirring, polymerizing dopamine to obtain polydopamine, wrapping fiber with the polydopamine, and simultaneously loading the metal nanoparticles; then, carrying out heat annealing treatment under the atmosphere of inertial gas to prepare a fiber@nitrogen-doped carbon metal compound material, namely the fibrous catalyst loaded with metal nanoparticles. The preparation and the application disclosed by the invention have the beneficial effects that by setting of a whole process flow of thepreparation method and improvement on reaction conditions and parameters of all key process steps, the activity and the cycling stability of the loaded nano-metal catalyst can be effectively improved.

The invention relates to an impact resistance optical resin glasses and a manufacturing method thereof, which is characterized in that optical resins materials consist of materials which have A component and B component, and the weigh percentage ratio of the two components is that: A component: B component = 40-50: 60-50, wherein, the A component is prepared by bi-isocyanic acid hexyl ester with the weigh percentage ratio 44-56 percent and multivariate isocyanate-group compounds which have a benzene ring and have the weigh percentage ratio of 56-44 percent; the B component is prepared by the reaction products of pentaerythritol and 3-sulfhydryl-acrylic acid with the weigh percentage ratio 85-95 percent and tetrathio-pentaerythritol with the weigh percentage ratio 15-5 percent; a catalyst adopts double dodecyl halide stannous: R-D2Sn-R; and the addition amount of the catalyst is 0.05-0.12 percent of the total weight of the A and the B components. A computer temperature control curing oven which is provided with a quick cooling device is adopted by the invention, thus guaranteeing the optical precision and the optical quality of the glasses, well and uniformly mixing the raw materials and greatly improving the qualification rate of the glasses.

The invention provides a preparation method of ammonium polyphosphate having high polymerization degree. II type ammonium polyphosphate is added and acts as a seed crystal and a solid catalyst is added, so that a polymerization reaction of II type ammonium polyphosphate is more uniform and is stable, the temperature in a synthetic process is easy to control, and the polymerization degree of a synthetized product is improved.

The invention belongs to the field of composite materials, and concretely relates to a nano-hydroxyapatite/carboxymethyl chitosan/poly(lactic-co-glycolic acid) micro-nano hybrid drug-loaded scaffold and a bionic preparation method thereof. The three-dimensional bionic hybrid drug-loaded scaffold is prepared through combining solvent evaporation and freeze drying technologies by using a high speed emulsifying machine via adopting nano-hydroxyapatite and carboxymethyl chitosan as a water phase and an emulsion continuous phase, adopting a methylene chloride solution of poly(lactic-co-glycolic acid) as an oil phase and an emulsion dispersion phase, using glutaraldehyde as a cross-linking agent to immobilize the carboxymethyl chitosan in the continuous phase and adopting the main component icariin in a traditional Chinese medicine epimeddium as a carrier drug. The preparation method has the advantages of simple preparation process and mild reaction conditions, and the obtained scaffold overcomes the performance defects of single natural polymer materials or synthetic polymer materials, has the advantages of intercommunicated pores, uniform pore diameter, figurability, slow drug release, good bone bonding ability and good biocompatibility, and is expected to become a new osteoporosis treatment composite material.

The invention discloses a nitrogen-containing porous polymer chelating resin and a preparation and an uranium-containing wastewater treatment method. The nitrogen-containing porous polymer chelating resin is characterized in that the nitrogen-containing porous polymer chelating resin is prepared by a solvent heat method, and a chelating group is a nitrogen-containing group; the BET (Brunauer, Emmett and Teller) specific surface area of the porous polymer chelating resin containing nitrogen group is 100 to 500m<2>/g; the BJH (Barrett, Joyner and Halenda) pore diameter is 10 to 50nm; the BJH pore volume is 0.5 to 1.5cm<3>/g. The porous polymer chelating resin containing the nitrogen group has the advantages that the preparation process is simple and rapid, and the operation is easy; the adsorbing ability on uranium ions is strong, the adsorbing amount is large, the adsorbing speed is high, and the like; the porous polymer chelating resin can be easily separated from a water solution, and can effectively adsorb and recycle uranyl ions in the water solution.

The invention discloses a making method of powder-shaped, insoluble, water, urine or blood absorbable low-soluble material high-hydroscopicity resin, which comprises the following steps: adding crosslinking agent in the acid group monomer solution with neutralizing rate over 50%; proceeding free radical polymerization for monomer solution and polymer initiator in the double-screw blender for 3-600s; drying through hot wind at 100-250 deg.c; grinding; sieving; coating surface crosslinking agent; heating surface at 80-230 deg.c; adding inert inorganic salt powder.

The invention provides a composite initiator of a hydrophobic associated polymer and a preparation method of the hydrophobic associated polymer. The composite initiator is prepared from the following raw materials in parts by weight: 1-10 parts of potassium persulfate, 1-10 parts of ammonium persulfate, 0.5-5 parts of dibenzoyl peroxide, 1-10 parts of sodium hydrogen sulfite, 1-10 parts of sodium sulfite, 0.1-1 part of triethanolamine, 0.5-5 parts of urea, 0.5-5 parts of thiourea, 0.05-0.5 part of azodiisobutyronitrile and 0.05-0.5 part of azobis(isobutylamidine hydrochloride). The method comprises the following steps: a sequentially adding disodium ethylenediamine tetraacetate, sodium formate, lauryl sodium sulfate, acrylamide, AMPS-Na and DiC8AM to deionized water under a magnetic stirring condition, and fully stirring evenly; b introducing high-purity nitrogen into a mixed solution obtained from the step a, adding the composite initiator, and polymerizing to obtain hydrophobic associated polymer gel; and c coarsely crushing the hydrophobic associated polymer gel obtained from the step b, adding sodium hydroxide, hydrolyzing, drying in a blast drying oven, drying and crushing to obtain the product.

The invention belongs to the technical field of polylactic acid production, and specifically discloses a colored polylactic acid particle and a preparation method thereof. The provided colored polylactic acid particle is composed of polylactic acid and pigments. The colored polylactic acid particle is prepared by directly mixing a polymerized molten colorless polylactic acid material with coloredpolylactic acid prepared from polylactic acid based color master batch to prepare colored polylactic acid mixed melt, cutting the mixed melt in water, and drying. The colored polylactic acid particlecan be used in more application fields and can be made into colored fibers, colored plastic products, colored films, and the like. For the polylactic acid downstream application production enterprises, the colored polylactic acid particle can be directly used for production, the step of coloring colorless polylactic acid can be eliminated, and thus the equipment investment and raw material cost are both prominently reduced.

A continuous long fibre-reinforced reactive resin product is made up from the monomer able to be polymerized by free radicals through immersing long fibres, pre-shaping by a mould, microwave reactive cavity for polymerizing and curing, moulding, cooling and solidifying. Its advantages are high polymerizing speed, and high adhesion between fibres and resin.

The invention discloses a method of two-stage continuous polymerization production of petroleum resin, which comprises the following steps of: (1) continuously adding raw materials for polymerization and catalyst into a polymerization reactor (1) for the first stage of polymerization, with the polymerization temperature of 55-75 DEG C, the polymerization pressure of 0.2-0.35MPa and the material retention time of 1-3 hour(s);(2)delivering the materials into a delay reactor (2) for the second stage of polymerization, with the polymerization temperature of 55-75 DEG C, the polymerization pressure of 0.2-0.35MPa and the material retention time of 0.5-2 hour(s); and (3)carrying out desorption of the materials with the catalyst and solvent to obtain the petroleum resin. Since the process of feeding materials or feeding the catalyst is eliminated, the concentration of the catalyst and active components for polymerization in the polymerization system is relatively stable. Compared with the single-stage continuous polymerization, the second stage of polymerization is added, the mixing in the polymerization reaction is more uniform, the heat of reaction can be removed promptly, the quality of the resin can be improved effectively, and C5 petroleum resin with narrow molecular weight distribution and small weight-average molecular weight can be obtained.

The invention provides a polymerization method of a biodegradable high-barrier thermoplastic polymer. Polymer monomers comprising (a) composite polyatomic alcohol of polycarbonate segment and polyether segment; (b) one or more small-molecular compounds with two or more hydroxyl groups and amino groups; (c) one or more diisocyanate compounds; and (d) one or more cross-linking agents. A preparation method comprises the steps that (a), (b) and (c) are subjected to mixed reaction; and the monomer (d) is added into the product of the mixed reaction, such that grafting cross-linking is carried out. According to the invention, polymerization monomers are finely selected, and reaction route and conditions are reasonably designed, such that the polymer has good barrier property against water vapour and oxygen, and that the polymer has good physical and mechanical performances. The polymer also has good biodegradability and wider application scope.

The invention provides a preparation method of a coating type dye polarization component, wherein the coating type dye polarization component comprises a substrate; a polarization alignment film is arranged on the substrate; the preparation method comprises the following steps: heating a reaction vessel to a reaction temperature according to a hot bath method, maintaining the reaction temperature in the reaction vessel; placing a reaction monomer in the reaction vessel, stirring and fully dissolving, then standing for a first time interval; placing a dye in the reaction vessel, stirring and fully dissolving, then standing for the first time interval to obtain a polarization film solution; coating the polarization film solution on the polarization alignment film of the substrate by using a spin-coating method to obtain a polarization film; curing the polarization film through ultraviolet irradiation to obtain the coating type dye polarization component. The invention further provides a liquid crystal panel. The solution of the invention can improve a polarization degree of a polarizer and improve a contrast ratio of the liquid crystal panel.

The invention discloses hydrogel filled with nitrogen-doped carbon nanotubes and a preparation method of the hydrogel, and the method comprises the following steps: mixing a hydrogen bond acceptor compound, a hydrogen bond donor compound and a cross-linking agent, and stirring in an oil bath until transparent and clear liquid is obtained, so as to obtain deep eutectic solvent liquid; successively adding an initiator and a nitrogen-doped carbon nanotube into a deep eutectic solvent liquid at a temperature above 35 DEG C, uniformly stirring to form a mixture solution, transferring the formed mixture solution into a tubular reactor, heating the reactor by using a heat source to initiate a polymerization reaction, and evacuating the heat source till the liquid in the whole reactor is completely converted into polymer gel; and soaking and washing the polymer gel with distilled water, and freeze-drying to obtain the target nitrogen-doped carbon nanotube filled hydrogel. The reaction rate of front-end polymerization is increased by filling a small amount of nitrogen-doped carbon nanotubes with general applicability, so that the target hydrogel is rapidly prepared.

The invention provides a lithium-sulfur battery positive copolymer sulfur material. The lithium-sulfur battery positive copolymer sulfur material is prepared through steps as follows, (1), sublimed sulfur powder and organic polymerization agent are collected to obtain uniform mixture through grinding, and the organic polymerization agent is nitrile organic substance; (2), the uniform mixture of the sublimed sulfur and the organic polymerization agent is sealed in a container under the high temperature condition and is insulated and stirred; and (3), the copolymerized sulfur obtained in the step (2) is pulverized to obtain positive electrode copolymerized sulfur particles. The invention further provides a lithium-sulfur battery made from the lithium-sulfur battery positive copolymer sulfurmaterial. The lithium-sulfur battery positive copolymer sulfur material is advantaged in that preparation requirements can be met through simple heating equipment, and the preparation process has characteristics of convenient operation and simple process. The preparation method is advantaged in that chemical bonding between the organic matter and the sulfur is produced through bond opening reaction of nitrile compounds'unique carbon-nitrogen triple bond and the 8-membered ring structure of the sublimated sulfur at the high temperature, and the polymeric sulfur copolymer can be formed.

The invention discloses a method for producing dyed hollow filaments by recycled polyester in the field of polyester fiber production methods. The method includes: preparing a recycled material, and making the recycled material into recycled masterbatch; subjecting the recycled masterbatch to solid-phase tackifying under a vacuum state; mixing the tackified material and masterbatch, sending into a screw extruder to realize mixing and extruding, and spinning through a hollow spinneret plate to obtain hollow filaments; cooling and blowing the filaments under the protection of nitrogen; oiling, and subjecting multiple strands of filaments to interlacing treatment through an interlacing jet; winding and storing. The method can be used for recycling of various waste beverage bottles and textile offcut materials, and environmental friendliness and low energy consumption are realized.