105 results about "Precipitation polymerization" patented technology

The invention discloses preparation of DOPO-based hollow polymer microspheres and application of the DOPO-based hollow polymer microspheres in flame-retardant polymers, and belongs to the technical field of high polymer materials. The preparation method of the DOPO-based hollow polymer microspheres comprises the following steps: preparing a template core through self-stable precipitation polymerization, then polymerizing a DOPO-based flame-retardant monomer, an anhydride monomer and a cross-linking agent on the surface of the template core to construct a cross-linking shell layer in situ to obtain copolymer microspheres with a core-shell structure, and finally removing the template through solvent etching to obtain the DOPO-based hollow polymer microspheres. And the DOPO-based hollow polymer microspheres are prepared. The compatibility between the DOPO-based hollow polymer microspheres and a polymer matrix is greatly improved through rich anhydride groups on the surfaces of the DOPO-based hollow polymer microspheres, the flame retardant property of the polymer composite material is improved, the mechanical property of the polymer composite material is greatly improved, and due to the unique hollow structure of the polymer composite material, the flame retardant property of the polymer composite material is greatly improved. The polymer material is endowed with excellent transparency and low dielectric property.

The invention constructs a universal visual virus molecularly imprinted sensor modified with an anti-protein coating, the sensor uses magnetic Fe3O4 as an imprinting carrier, HBV as a template and dopamine as a functional monomer for imprinting to obtain a molecularly imprinted polymer with a polydopamine coating (PDA), and before the template is removed, the molecular imprinting polymer with the polydopamine coating (PDA) is separated from the template, so that the molecular imprinting polymer with the polydopamine coating (PDA) is obtained. The surface of the PDA layer is covered with a slightly cross-linked PMEO2MA layer through a water precipitation polymerization method, and the polymer can effectively reduce non-specific protein adsorption; and finally, exposing an imprinting cavity of the PDA layer by eluting the template molecules. On the other hand, potassium permanganate (KMnO4) is used as a signal output molecule, and when no target object exists, the strong reducibility of PDA can enable KMnO4 entering the imprinting cavity to be subjected to a color fading reaction. Based on the principle, high-specificity colorimetric visual detection on the HBV is realized. The sensor can be combined with a smart phone through naked eyes to carry out visual semi-quantitative analysis and carry out quantitative detection through ultraviolet rays, and the universality of the sensor can be confirmed through a template replacement experiment. And meanwhile, the sensor shows an excellent cost advantage. The diagnosis which is high in sensitivity, low in cost and capable of achieving rapid visualization shows huge potential in practical application, and particularly has important application value in infectious disease screening and monitoring work in areas with limited resources.

The invention relates to the field of cables, and discloses a flame-retardant impact-resistant cable and a preparation process thereof.The cable sheath layer is prepared from low-density polyethylene, nitrile rubber, ethylene-vinyl acetate copolymer, modified halloysite nanotubes and a flame-retardant additive, the preparation method comprises the following steps: carrying out acylating chlorination on 2, 4-dihydroxyphenyl)-2H-benzotriazole, reacting with 3, 5-di-tert-butyl-4-hydroxybenzylamine to prepare a modified acylating chlorination ultraviolet absorbent, and grafting the modified acylating chlorination ultraviolet absorbent with aminated halloysite nanotubes to prepare the ultraviolet absorbent. The aminated halloysite nanotube is prepared by using gamma-aminopropyl triethoxy silane to modify the aminated halloysite nanotube; the flame-retardant additive is prepared from a flame-retardant intermediate obtained by reaction of diphenyl silanediol and phosphorus oxychloride and phosphonitrilic chloride trimer through a precipitation polymerization method. The added modified halloysite nanotube and flame-retardant additive can endow the cable with excellent mechanical properties, aging resistance, flame retardance and heat resistance.

The invention relates to the field of pouring sealants, and discloses a modified epoxy resin pouring sealant and a preparation method thereof, the pouring sealant comprises epoxy resin, a modified inorganic filler, a modified additive and an auxiliary agent; the modified inorganic filler is prepared by grafting a quaternized s-triazine derivative and an inorganic filler; the quaternized s-triazine derivative is prepared through the steps that 3, 5-diaminophenylboronic acid, cyanuric chloride, 3-chloropropyltrimethoxysilane and 1, 4-butanediamine are sequentially subjected to substitution to prepare a s-triazine derivative, then the s-triazine derivative reacts with N, N-dimethyl-1, 3-diaminopropane, and bromoethane is used for quaternization treatment. The modified additive is prepared from a modified bismaleimide monomer prepared from maleic anhydride and 5 (6)-amino-1-(4-aminophenyl)-1, 3, 3-trimethylindane and 1-methyl-4-isopropyl cyclohexene through a self-stabilization precipitation polymerization method, the prepared pouring sealant is high in tensile strength, good in impact resistance and good in mechanical property, and the prepared pouring sealant has the advantages of being good in mechanical property, good in mechanical property and good in mechanical property. Meanwhile, good heat resistance, flame retardance, dielectricity and antibacterial activity are achieved.

The invention relates to the technical field of polyacrylonitrile-based carbon fibers, and provides an ammonification method of polyacrylonitrile powder. The preparation method comprises the following steps: demonomerisation is carried out on carboxyl-containing polyacrylonitrile feed liquid obtained by precipitation polymerization, and first drying is carried out to obtain carboxyl-containing polyacrylonitrile powder; the carboxyl-containing polyacrylonitrile powder is soaked in an ammoniation reagent aqueous solution for ammoniation; the ammoniation reagent is ammonium salt. Starting from the source of the spinning solution, the demonomerisation polyacrylonitrile powder is ammoniated before the spinning solution is prepared, the operation is simple, the ammoniation efficiency is high, and the hydrophilicity of polyacrylonitrile can be effectively improved; moreover, the ammoniation reagent adopted by the invention overcomes the defects of strong odor and high toxicity of common liquid amine and gaseous ammonia, and the ammoniated system is pure and environment-friendly; furthermore, the specific ammoniation reagent adopted by the invention does not introduce miscellaneous elements into the system, so that the influence on the performance of the final carbon fiber caused by impurities generated by pre-oxidation and carbonization in the later period is avoided.

The invention provides a diketone polymer lithium adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: sequentially adding an ester group / hydroxyl polymer, acetoacetic acid ethylene glycol methacrylate and a cross-linking agent ethylene glycol dimethacrylate into a round-bottom flask, uniformly dissolving with a solvent 1, adding an initiator azodiisobutyronitrile, removing oxygen in an ice bath, and carrying out thermal initiation polymerization to obtain white powder; and washing with ethanol, and drying in vacuum to obtain the diketone polymer lithium adsorbent. The synthesized diketone-containing polymer adsorption material has high adsorption activity under the neutral condition, the adsorption capacity of the diketone-containing polymer adsorption material to lithium ions can reach 27 mg / g at most, the diketone-containing polymer adsorption material can selectively separate and recover the lithium ions from a mixed solution of lithium ions, sodium ions, potassium ions and the like, the adsorption material is prepared by adopting a precipitation polymerization method, and the adsorption efficiency of the adsorption material is greatly improved. The method has the advantages of high product conversion rate, simple operation, stable adsorbent performance and easy industrial application.

A solvent-based plastic recycling method that removes color and produces plastic polymers substantially free of exogenous colorants. The method comprises selecting a solvent that selectively dissolves an individual polymer and has low solubility of colorants and decomposition products of the colorants. A combined precipitator and piston device is used to precipitate the polymer solution and mechanically remove the solvent from the precipitate before thermal drying. An adsorption bed is used to clean the recovered solvent as it is recycled to the process.

The invention relates to a preparation method of a plant exosome, which comprises the following steps: 1) crushing and sieving a dry plant, stirring and filtering plant raw material powder and a buffer solution according to a material-liquid ratio of 1g: (5-15) mL; the method comprises the following steps: co-grinding a fresh plant and a buffer solution, and filtering according to a material-liquid ratio of 1: (1-5) mL; 2) centrifuging the filtrate, and collecting supernate; 3) performing filtration concentration and impurity removal on the supernate through a tangential flow filtration system to obtain a concentrated solution; 4) filtering the concentrated solution, adding polyglutamic acid and glucan, and carrying out polymerization precipitation; after polymerization is finished, centrifuging and collecting precipitates; 5, the precipitate is resuspended with pure water and centrifuged, supernate is taken, and the exosomes are obtained.By means of the method, the extraction efficiency is remarkably improved, the method has the advantage of being easy and convenient to operate, and a solid foundation is laid for wide application of the plant exosomes in industrial production.

The invention provides a preparation method of a hydrophobic silver nanoparticle doped coating, which comprises the following specific steps: preparing silicon shell silver chloride nanoparticles (AgCl (at) SiO2NPs) by taking cetyltrimethylammonium chloride (CTAC), silver nitrate, sodium chloride and tetraethyl orthosilicate (TEOS) as raw materials through a one-pot method, and introducing carbon-carbon double bonds by 3-(methacryloyloxy) propyltrimethoxysilane (MPS) under an acidic condition. In the subsequent distillation-precipitation polymerization process, 4-chloromethyl styrene (VBC) is grafted with chloromethyl, and finally, perfluoropolyether methyl acrylate (PFPEMA) is introduced through atom transfer radical polymerization (ATRP) to form AgCl (at) SiO2-F NPs. Nanoparticles are added into polydimethylsiloxane (PDMS) to be evenly mixed, a silica gel catheter is used for pulling and curing to form the hydrophobic nanoparticle coating SR-F. The hydrophobic nanoparticle coating SR-F is mature in step, firm in film and good in hydrophobicity, and experimental results show that the coating has long-acting antibacterial ability.

The invention discloses a precipitation polymerization preparation method of polyacrylonitrile with controllable molecular weight and narrow distribution based on micro-nano fluid, which is characterized in that acrylonitrile and comonomers thereof are used as raw materials, and polyacrylonitrile is continuously synthesized by using a microchannel reactor under the action of an initiator. In the binary polymerization reaction, the mass ratio of acrylonitrile to the comonomer 1 is 100: (1-10), and in the ternary polymerization reaction, the mass ratio of acrylonitrile to the comonomer 1 and the comonomer 2 is 100: (1-10): (1-10). The product yield reaches 80% or above, controllable preparation with the weight-average molecular weight within the range of 30 * 10 < 4 >-70 * 10 < 4 > g / mol and the molecular weight distribution lower than 1.3 can be achieved, and the method has the advantages of being continuous and stable for a long time, safe in process, high in conversion rate, narrow in molecular weight distribution, controllable in molecular weight and the like.

The invention relates to a preparation method of a pigment dispersant and a pigment dispersion. The preparation method of the pigment dispersant comprises the following steps: (1) carrying out self-stabilization precipitation polymerization on light gasoline before etherification and maleic anhydride in an organic solvent to obtain a mixed olefin-maleic anhydride copolymer; (2) carrying out functional modification on the mixed olefin-maleic anhydride copolymer; wherein the functional modification is (i) hydrolysis modification or (ii) sulfonation modification, (i) hydrolysis modification: hydrolyzing a maleic anhydride group in the mixed olefin-maleic anhydride copolymer, and (ii) sulfonation modification: reacting the mixed olefin-maleic anhydride copolymer with a sulfonic acid compound having a hydroxyl group or an amino group. According to the preparation method of the pigment dispersant, the low-value petrochemical crude product (light gasoline before etherification) is used as the raw material, so that the utilization efficiency of the petrochemical crude product is improved, and the green and environment-friendly concept is met.

The present invention relates to hybrid polymers obtained from at least one monomer comprising at least one unsaturated ethylenic functional group by a free radical precipitation polymerization process in the presence of at least one protein. The invention also relates to the use of said hybrid polymer as a tackifier in various formulations or compositions.

The present invention discloses a preparation method and application of an antibacterial nano-hydrogel. By using free radical precipitation polymerization in combination with dialysis method to prepare the nano-hydrogel material, it effectively avoids the problem of too fast reaction rate between metal salt ions and monomers, the use of additional cross-linking agents, and reduces the operation process of reloading metal salt ions after obtaining the nano-gel. It can prepare nano-hydrogels with uniform particle size, good dispersibility, stability, antibacterial property and biocompatibility in one step. The physical and chemical properties of the nano-hydrogel are easy to regulate, and it has potential antibacterial and anti-inflammatory functions. It can inhibit the crystallization of pathological crystals through mechanisms such as chelation, dispersion and adsorption, and avoid inflammation or infection at the disease site through the controlled release of metal salt ions. It can even promote bone repair. The preparation method is green, environmentally friendly, simple and easy to implement. The obtained nano-hydrogel is of great significance for the treatment of pathological inorganic salt crystallization diseases and has broad application prospects in the biomedical field.

The invention relates to a preparation method of hollow nanofibers. The preparation method comprises the following steps: S1, preparing an initiator emulsion: ultrasonically dispersing an initiator into an alkane solvent to prepare the initiator emulsion; s2, preparing a monomer-containing solution: ultrasonically dissolving an aromatic monomer with more than two carbon-carbon double bonds and an optional aromatic monomer with one carbon-carbon double bond in an alkane solvent to prepare the monomer-containing solution; s3, polymerization reaction: mixing the monomer-containing solution with the initiator emulsion, and performing polymerization reaction during continuous ultrasonic treatment, the polymerization reaction being room-temperature active cation precipitation polymerization; and S4, terminating the reaction: after the polymerization reaction, adding a terminating agent, and continuing ultrasonic treatment to obtain the hollow nanofiber. The preparation method of the hollow nanofiber is high in reaction speed and simple in process, raw materials are low in cost and easy to obtain, and industrial ton-level batch production can be achieved.

This invention relates to an aqueous binder for lithium-ion battery negative electrodes, its preparation method, and its application. The raw materials for the aqueous binder include unsaturated carboxylic acid monomers, unsaturated nitrile monomers, unsaturated amide monomers, acrylate monomers, and functional monomers. The functional monomers include at least one selected from hydroxyethyl acrylate, hydroxyethyl methacrylate, methoxy polyethylene glycol acrylate, allyl polyethylene glycol, and allyl polyethylene glycol monomethyl ether. The aqueous binder of this invention incorporates acrylate monomers and functional monomers, which can lower the glass transition temperature of the copolymer while maintaining high peel strength. By introducing functional monomers with long side chains, the double-layer mechanism of polyacrylic acid itself and the steric hindrance effect of the long side bonds of the functional monomers are utilized as dispersants to achieve stable dispersion of the negative electrode slurry particles. The precipitation polymerization method can significantly reduce the internal resistance of lithium-ion batteries and improve peel strength.

Provided is a method for efficiently producing an N-alkylmaleimide-based copolymer which has an excellent optical characteristic and excellent heat resistance, and also relates to an N-alkylmaleimide-based copolymer which has an excellent optical characteristic, excellent heat resistance, and excellent molding fluidity. In an aspect of the present invention, an N-alkylmaleimide-based copolymer is produced as a particulate product by precipitation polymerization in which radical copolymerization of monomers including 20% by weight to 95% by weight of a specific N-alkylmaleimide and 5% by weight to 80% by weight of a styrene compound is carried out in a specific polymerization solvent.

The invention relates to a preparation method of a polymaleic anhydride-proline / COF hollow mesoporous catalyst as well as a product and application thereof, and belongs to the technical field of preparation of functional materials. A self-stabilization precipitation polymerization method is adopted, no stabilizer or surfactant needs to be added, and the prepared microspheres are clean in surface, simple in post-treatment, free of stirring, simple in reaction system, short in reaction time and high in polymerization efficiency. The preparation method comprises the following steps: firstly, synthesizing COF serving as a template from 4, 4-bibenzaldehyde and s-triphenylamine, and performing dehydration polymerization on residual-NH2, divinyl benzene, maleic anhydride and proline to form a special hollow mesoporous catalyst which is relatively good in crystallinity, high in specific surface area, uniform in pore distribution and compact in structure arrangement, namely a polymaleic anhydride-proline / COF hollow mesoporous catalyst. Excellent stereoselectivity and yield are obtained by catalyzing direct nitro-Mannich asymmetric cascade reaction, and the preparation method is simple and high in yield.

The application relates to the technical field of polyolefins, and discloses a coordination precipitation polymerization method for olefin polymerization and a polyolefin, the method comprising mixing olefin monomers, a catalyst and an additive, and performing a polymerization reaction; the olefin monomers contain nonpolar monomers and polar monomers, the nonpolar monomers are selected from one or more than two of ethylene, alpha-olefins and internal olefins, and the polar monomers are selected from one or more than two of enol, unsaturated carboxylic acids and unsaturated carboxylic acid esters; and the catalyst is selected from a post-transition metal complex shown in formula (I). The application can eliminate the catalyst loading process, realize olefin homogeneous catalyst polymerization self-forming, and prepare polyolefins with good particle morphology.

The present invention relates to a self-stabilized precipitation polymerization method using an ether-containing solvent. The method of the present invention uses a solvent containing an ether compound as a polymerization reaction medium, wherein the boiling point of the ether compound is below 145 °C. By using a low-boiling ether solvent as the medium, the energy consumption of the solvent fractionation recovery operation is low, the solvent recycling is easy to carry out, the cost is low and it is more environmentally friendly.

This invention belongs to the field of polymerization reactions and discloses a reaction system and method for the precipitation polymerization of α-olefins with maleic anhydride. The system includes a reaction circulation subsystem and an external circulation temperature control subsystem. The reaction circulation subsystem includes a reaction vessel, a reactor, a reaction circulation pump, and a mixing connection device. The reaction vessel includes a vessel body, a jacket, a stirring device, and a first non-condensable gas outlet. The reactor includes a reaction liquid chamber, an external circulation liquid chamber, and a second non-condensable gas outlet. The external circulation liquid chamber is arranged around the outside of the reaction liquid chamber and is not connected to it. The external circulation temperature control subsystem includes an external circulation buffer tank, an external circulation pump, an external circulation heater, and an external circulation cooler. This invention, through a segmented reaction system, separates the heating and cooling functions of the reaction vessel, meeting the heating and cooling requirements of the precipitation polymerization of α-olefins with maleic anhydride in different solvent systems at different reaction stages.

The application belongs to the field of water pollution control, and discloses a preparation method and application of a flexible imprint MOFs catalyst capable of being magnetically recycled. A core-shell structure flexible imprint catalyst is synthesized by adopting a precipitation polymerization method with a magnetic Fe-MOF as a base. The catalyst has multi-target adsorption characteristics, can simultaneously and quickly target capture various sulfonamide organic matters in water, realizes efficient targeted degradation of sulfonamide organic pollutants in water, has the characteristics of magnetic recovery, can be quickly separated from the solution by an external magnetic field to realize efficient recovery and reuse of the catalyst, conforms to the green environmental protection concept, and has a good engineering application prospect.

The invention relates to a method for producing a thermoplastic polyurethane powder by means of precipitation polymerisation. The method comprises i) providing a solvent mixture which contains at least one first aprotic solvent A1 having a relative permittivity εr between 2 and 20 (at 20 °C and 100 kHz) and a second aprotic polar solvent A2 from the group 1,2-propylene carbonate, gamma-butyrolactone or ethylene carbonate; ii) adding a polyol B having a molecular mass between 60 g / mol and 250 g / mol and a diisocyanate C; iii) reacting B and C in the solvent mixture A at a temperature of at most 150 °C, wherein the resulting polyurethane precipitates as a solid and forms a dispersion; iv) separating the solvent, washing the solid and drying to give the powder. The resulting powder has a molecular mass Mw of ≥ 35000 g / mol, an allophanate content of < 0.25 mol % and a proportion of > 25.0% of particles < 0.500 mm and satisfies a Mz : Mw ratio of < 4.0.

The invention provides a preparation method of a flatulence slow-rebound foam composition. The preparation method comprises the following steps: with isocyanate as a unique monomer, preparing linear polyurea microspheres in a reaction medium by using a precipitation polymerization method; adding a multifunctional amine cross-linking agent and polyether amine, and supplementing similar isocyanate, so that the surface of the polyurea microsphere is subjected to a cross-linking reaction to obtain a polyurea core-shell microsphere with a linear core and a cross-linked shell; and dissolving out the inner core of the polyurea core-shell microsphere to obtain the porous hollow polyurea microsphere. The microspheres prepared by the method are good in flatulence effect, and the flatulence slow-rebound foam composition is excellent in air permeability and mechanical property.

The present invention relates to hybrid polymers obtained by a free radical precipitation polymerization method from at least one monomer containing at least one unsaturated ethylenic functional group in the presence of at least one protein. The present invention also relates to the use of said hybrid polymers as thickeners in various formulations or compositions.

The invention relates to a precipitation polymerization method of a Fischer-Tropsch synthesis product and functionalized cross-linked copolymer microspheres prepared by the precipitation polymerization method. The precipitation polymerization method comprises the following steps: carrying out precipitation polymerization on a reaction system containing a Fischer-Tropsch synthesis product, an electron accepting monomer, a cross-linking agent, an initiator and a solvent; a cross-linking group of the cross-linking agent is a group with a carbon-carbon double bond; the Fischer-Tropsch synthesis product comprises an electron donating monomer. The precipitation polymerization method provided by the invention has the characteristics of simple process, easy product separation and low cost, and provides an effective way for high-value utilization of Fischer-Tropsch synthesis products.

A solvent-based plastic recycling method that removes color and produces plastic polymers substantially free of exogenous colorants. The method comprises selecting a solvent that selectively dissolves an individual polymer and has low solubility of colorants and decomposition products of the colorants. A combined precipitator and piston device is used to precipitate the polymer solution and mechanically remove the solvent from the precipitate before thermal drying. An adsorption bed is used to clean the recovered solvent as it is recycled to the process.

The invention relates to an extracellular vesicle enrichment material as well as preparation and application thereof. According to the enrichment material, SPP serves as a monomer, AIBN serves as an initiator, and a hydrophilic amphoteric high-molecular polymer is prepared through a precipitation polymerization reaction. The efficient capture of the extracellular vesicles is realized by utilizing the coordination effect of the prepared amphoteric high-molecular polymer and phosphatidylcholine on the surfaces of the extracellular vesicles. Meanwhile, the material is subjected to phase change centrifugation in an organic phase with a certain concentration to form a precipitate, and one-step efficient enrichment of the extracellular vesicles is realized by utilizing the characteristic. The material contains repeated amphoteric group units, so that the material has strong affinity to extracellular vesicles, and meanwhile, the strong hydrophilicity of the material can also avoid non-specific adsorption of impure proteins, so that the enrichment purity of the extracellular vesicles is remarkably improved. In addition, the material has the advantages of being easy to prepare, simple and convenient to operate, efficient in enrichment and the like, and has important significance on separation and purification and downstream analysis of extracellular vesicles in body fluid.

This invention relates to the field of polyolefin technology, and discloses a coordination precipitation polymerization method for olefin polymerization and a polyolefin thereof. The method includes mixing olefin monomers, a catalyst, and an auxiliary agent to carry out a polymerization reaction; the olefin monomers contain nonpolar monomers and polar monomers; the nonpolar monomers are selected from one or more of ethylene, α-olefins, and internal olefins; the polar monomers are selected from one or more of enols, unsaturated carboxylic acids, and unsaturated carboxylic acid esters; the catalyst is selected from a post-transition metal complex of formula (I). This invention eliminates the need for catalyst loading in the process, achieves self-forming polymerization of olefins using homogeneous catalysts, and prepares polyolefins with good particulate morphology.

A system and method for making and using proppant particles is provided. An exemplary proppant particle includes a composite of a precipitated polymer matrix and a plant-based material, wherein the precipitated polymer matrix includes a thermoplastic, and wherein the plant-based material includes microparticles.

This invention relates to a polyamide 6 microsphere and its preparation method. The preparation method of the polyamide 6 microsphere includes: melting caprolactam, adding an initiator and reacting at 120-130 °C for 10-30 min; then adding a solvent consisting of a mixture of hydrocarbons and high-boiling-point ethers in a volume ratio of 1:9 to 9:1; adding an appropriate amount of dehydrating agent and an appropriate amount of activating agent; and reacting at 135-150 °C for 20-90 min to obtain polyamide 6 microspheres. This invention uses hydrocarbons and high-boiling-point ethers as a mixed solvent and employs precipitation polymerization without solvent etching to directly prepare spherical, narrowly distributed, high-purity, and controllable-size polyamide 6 microspheres. This meets the high-performance application requirements of 3D printing, bioseparation, and high-end coatings, which are unattainable by traditional methods. Furthermore, the mixed solvent used in the preparation process can be recycled and reused.