538 results about "Initiation" patented technology

The invention discloses a self-crosslinking temperature-resistant salt-resistant emulsion type fracturing fluid thickening agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The raw materials adopted by the invention comprise 30 to 50 parts of an oily solvent, 15 to 25 parts of deionized water, 10 to 20 parts of acrylamide, 5 to 10 parts of acrylic acid, 2 to 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.05 to 0.2 part of a crosslinking monomer, 0.5 to 1 part of a quaternary ammonium salt type hydrophobic association monomer, 4 to 8 parts of an emulsifier and 1 to 2 parts of a phase inversion agent. The self-crosslinking emulsion is formed through water phase-oil phase mixing, high-speed emulsification, low-temperature initiation polymerization and phase inversion treatment. Based on physical-chemical double-crosslinking temperature control cooperation, a salt-resistant-hydrophobic double-shielding mechanism and an integrated design without an exogenous crosslinking agent, the contradiction between the temperature-resistant and salt-resistant performance of a traditional thickening agent and the process complexity is broken through, and a technical support is provided for efficient development of high-temperature and high-salt oil and gas reservoirs.

The invention discloses a stimuli-responsive on-demand adhesion intelligent conductive hydrogel electrode patch and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing a stimuli-responsive phase transition substrate material, a monomer of a stimuli-responsive color change component, a conductive component, a viscous component, an initiator and a cross-linking agent according to a ratio; then injecting the mixture into a mold, and carrying out initiated polymerization to obtain a hydrogel electrode patch; the stimulus-responsive color change component is a polymer having a UCST temperature or a polymer having a stimulus-responsive color change group. The stimuli-responsive on-demand adhesion conductive hydrogel can be well attached to the skin under the use condition, the signal detection quality is improved, and the signal-to-noise ratio is increased; and after monitoring is completed, the adhesive force with the epidermis of the human body can be reduced in a mild stimulation mode, and lossless removal is achieved. In addition, due to the existence of the stimulus-responsive color change component, the strength of the adhesion performance can be effectively and visually indicated.

The invention relates to the field of foaming materials, in particular to a low-solvent-residue expandable polystyrene material and a preparation method thereof. The expandable polystyrene material with low solvent residue comprises the following raw materials in percentage by weight: 0.35-0.45% of a free radical initiation system, 0.35-0.45% of S, S, S, S, S, S, S, S, S, S, S, S, S, S, S According to the present invention, the material comprises, by weight, 0.1-0.15% of S, S '-bis (alpha, alpha'-dimethyl-alpha ''-acetoxy) trithiocarbonate, 0.15-0.2% of ascorbic acid, 0.1-0.2% of a nucleating agent, 0.2-0.3% of a suspending agent, 0.001-0.003% of an emulsifier, 5-6% of a foaming agent, 0.15-0.25% of a plasticizer, 0.001-0.002% of hydroxyethyl cellulose, 0.05% of sodium phosphate, 0.1-0.2% of zinc stearate, and 0.1-0.2% of glyceryl stearate, the obtained material has low solvent residue, meets food safety requirements, and is suitable for food packaging.

The invention relates to the technical field of hydrogel materials, and discloses a preparation method of self-growing hydrogel based on spatial morphology gradient change. The method comprises the following steps: constructing a hydrogel self-growth reaction environment comprising a self-growth initiator layer and a space confinement layer; covering the space confinement layer with a self-growing monomer aqueous solution, and forming concentration gradient distribution through diffusion to obtain a self-growing reaction mixing system; culturing the self-growth reaction mixed system, and forming the self-growth hydrogel with spatial morphology gradient change through a self-growth reaction of the self-growth monomer based on concentration gradient difference and the initiation effect of a free radical initiator; by selectively degrading alginate single-network hydrogel in a target mixed system, homogeneous self-growing hydrogel with spatial morphology gradient change is obtained. Based on the method, external equipment or a complex process is not needed, and the hydrogel can form a structure with spatial morphology gradient change in a self-growth mode under a constant-temperature condition.

The invention relates to an organic solid electrolyte for an in-situ curing high-voltage positive electrode, a battery and a preparation method. The organic solid electrolyte is formed by in-situ polymerization of ether monomers, ester monomers, a lithium salt and a solvent through synergistic thermal initiation of double initiators. The electrolyte disclosed by the invention has the advantages that the ester polymer monomer and the ether polymer monomer are blended, and then the two monomers are respectively polymerized in a thermal initiation manner to form mutually crossed macromolecular long chains. The strategy can improve the interface stability of the electrode and the electrolyte and reduce the interface impedance of the electrode and the electrolyte. In the formed polymer network structure, the ester chain segment enhances the mechanical strength and widens the electrochemical window; and the ether chain segment provides flexible and lithium ion transmission channels. Due to the chemical complementarity of the ester monomers and the ether monomers, the overall performance of the composite polymer electrolyte is improved.

The invention discloses a preparation process of an efficient water-absorbing and salt-resistant modified water-retaining agent, which specifically comprises the following steps: (1) mixing alkali liquor, an acrylic polymeric monomer and water to obtain a water-phase solution A; and (2) uniformly mixing the water-phase solution A with a cross-linking agent and a salt-resistant modified monomer, then adding an initiator, and carrying out polymerization reaction, the preparation method of the modified salt-tolerant monomer comprises the following steps: polymerizing a humate solution and starch hydrogel under the initiation of persulfate to obtain the salt-tolerant modified monomer. In the copolymerization reaction of the existing humic acid-based water-retaining agent, the starch hydrogel participates in the polymerization of the acrylamide, the acrylic acid and the modified monomer and has a synergistic effect with the functional group of the modified monomer in the raw materials, so that the comprehensive performance of the water-retaining agent is improved, and the molecular structure of the polymer provides good supporting force and mechanical strength.

The invention discloses a polyamine type porous polymer as well as a preparation method and application thereof, and belongs to the technical field of synthesis of porous organic polymers. The specific method comprises the following steps: dispersing beta-mercaptoethylamine, a photoinitiator and a porous framework polymer with carbon-carbon double bond connection in a polar organic solvent; under the ultraviolet light initiation condition, the photoinitiator excites beta-mercaptoethylamine to generate sulfydryl free radicals, and the sulfydryl free radicals and the porous framework polymer with carbon-carbon double bond connection are subjected to an addition reaction; and washing and drying the product after the addition reaction to obtain the amino-modified polyamine porous polymer. The preparation method provided by the invention is rapid in reaction, extremely high in reactant utilization rate and simple in post-treatment, and the prepared polyamine type porous polymer has rich adsorption sites, good stability and excellent carbon dioxide adsorption performance, and can be applied to the field of carbon capture and the like.

The invention discloses a multi-network anti-freezing hydrogel electrolyte, a preparation method thereof and application of the multi-network anti-freezing hydrogel electrolyte in an electrochemical device. The hydrogel is prepared by using polyvinyl alcohol (PVA) and polyacrylamide (PAM) to form a basic network skeleton, introducing phytic acid, ethylene glycol and lithium / zinc bimetal salt (Li2SO4 / ZnSO4), and carrying out thermal initiation polymerization and freeze thawing. The hydrogel prepared by the invention has a multiple physical cross-linked network formed by polymer molecular chain entanglement, hydrogen-bond interaction among functional groups and metal coordinate bonds constructed between phosphate groups and divalent metal ions, so that the hydrogel electrolyte has excellent mechanical properties. Due to introduction of ethylene glycol, formation of ice crystals is effectively inhibited, and the hydrogel is endowed with excellent anti-freezing performance; the high-concentration Li < + > and Zn < 2 + > ensure the high ionic conductivity. The supercapacitor assembled by using the hydrogel electrolyte shows relatively high specific capacitance and good capacitance retention rate under bending and freezing conditions, and has good electrochemical properties and safety performance.

The invention belongs to the technical field of thermal expansion microspheres, and particularly relates to a thermal expansion microsphere and a preparation method thereof, the best process for preparing the thermal expansion microsphere is screened out by comparing and selecting different dispersants, initiators and cross-linking agents and comparing the performance difference of the thermal expansion microsphere prepared under different reaction control conditions. According to the present invention, the thermal expansion microsphere prepared by using the process has good effects of accelerating the decomposition rate of ANBI, improving the polymerization reaction speed at the later stage and shortening the reaction in the manner of half-process supplementation of the initiation catalyst during the polymerization reaction, and the multi-batch verification results show that the thermal expansion microsphere prepared by using the process has characteristics of small yield and small product performance fluctuation among the batches, and has good application prospects. Products are subjected to application proofing tests, the performance of the products reaches the level of the best similar products in the current market, and the process has conditions for industrial large-scale production conversion.

The invention discloses a carbon nano tube / caprolactam in-situ body synthesized nylon 6 composite material and a preparation method and application thereof, the material is prepared from a carbon nano tube, caprolactam and a catalyst through a body reaction processing technology, and the carbon nano tube is a single-wall or multi-wall carbon nano tube. The preparation method specifically comprises the following steps: firstly, uniformly mixing the raw materials according to a specific proportion, and then sequentially completing the conveying of low-viscosity raw materials, the self-initiation of polymerization reaction, macromolecular growth and the extrusion of high-viscosity products in a double-screw extruder, so that the caprolactam monomer is subjected to continuous chemical reaction and physical forming, and the caprolactam-based composite material is obtained. The conductive carbon nanotube modified nylon 6 composite material is obtained through one-step in-situ bulk polymerization. According to the invention, under the condition that only a trace amount of carbon nanotubes are added, the composite material can present excellent conductivity, the preparation method is simple and efficient, has a remarkable cost advantage and is easy for industrial production, and the morphological structure of the composite material can be flexibly regulated and controlled through molding equipment according to actual use requirements.

The invention discloses a preparation method and application of a membrane separation material based on external field enhanced water isotope separation. The preparation method comprises the following steps: firstly, pre-enriching a precursor component containing a polymerizable monomer, a cross-linking agent and a photoinitiator in a confinement pore channel of a nano-porous carrier through an impregnation-encapsulation strategy; and then, through in-situ photo-initiation polymerization, a covalent cross-linked functional polymer network is constructed in the pore channel, and stable packaging of the polymer is realized. In the water isotope separation period, external field conditions are regulated and controlled, the molecular conformation of a polymer chain is accurately controlled, and the separation performance is optimized. According to the invention, by virtue of an external field strengthening technology, the intramolecular / intermolecular interaction is destroyed, and the macromolecular chain is converted from contraction to stretching, so that more functional sites are exposed, and the water isotope separation material designed by the invention has a huge practical application prospect.

A RAFT agent for photo-controlled (iniferter) polymerization, preparation method therefor, and applications thereof. The RAFT agent has a structure represented by the general formula:wherein R2 and R3 are each hydrogen, and R1 is methyl. The RAFT agent is structurally and chemically stable, simple to synthesize, and enables rapid photo-controlled polymerization under blue light. It has been demonstrated that when using this RAFT agent for polymerization, the reaction time is reduced to just a few minutes, achieving a high conversion rate for acrylate and acrylamide monomers. Additionally, polymerization with the RAFT agent does not require the introduction of additional initiators or photocatalysts, as the RAFT agent itself can facilitate chain initiation and chain transfer under blue light. Compared to other photo-controlled polymerization methods, the apparent propagation rate is faster, and no additional impurities are introduced into the final product, thereby not affecting the color and performance of the polymer.

The invention relates to a photo-crosslinkable water-based polyolefin emulsion as well as a preparation method and application thereof. The emulsion comprises modified polyolefin and water, the modified polyolefin is prepared from raw materials including polyolefin resin, maleic anhydride, a grafted photo-initiation monomer and a free radical initiator through graft polymerization; the grafted photo-initiation monomer contains vinyl and a photo-initiation group. The emulsion is prepared by melting the modified polyolefin to form an oil phase; dissolving an emulsifier in part of water to obtain a water phase; and adding the water phase into the oil phase while stirring, and then adding the rest of water to prepare the oil-in-water composite oil-in-water composite oil-in-water composite oil-in-water composite. The emulsion can be subjected to photo-crosslinking, and after photo-crosslinking, a coating film has excellent water resistance, solvent resistance, hardness and adhesive force.

The invention discloses an anti-fatigue detection method for a structural member made of a high polymer material, and belongs to the field of material detection.The anti-fatigue detection method comprises the following steps that S1, a thermoplastic high polymer raw material for preparing the structural member is heated to be in a molten state, and a first intermediate is formed; s2, preparing a shell layer by taking polylactic acid, Y-type polyethylene glycol succinic acid, acetylsalicylic acid and a DCP catalyst as raw materials, and preparing fluorescent color developing agent microspheres by taking a high-temperature-resistant liquid fluorescent color developing agent as a core material; s3, adding fluorescent color developing agent microspheres into the first intermediate, uniformly stirring, heating, continuously stirring, uniformly mixing the color developing agent with the first intermediate after the color developing agent is released to obtain a second intermediate, and performing injection molding, molding, curing and cooling on the second intermediate to obtain a structural part sample; and S4, carrying out fatigue detection on the structural member sample by adopting a fatigue testing machine. The method solves the problems that closed cracks or internal defects are difficult to directly recognize from the inside and the initiation and expansion process of the internal cracks of the component cannot be captured at present.

The invention belongs to the technical field of stripping liquid, and particularly discloses water-based photoresist stripping liquid and a preparation method thereof. The water-based photoresist stripping liquid is prepared from the following raw materials in percentage by mass: 10 to 15 percent of quaternary ammonium salt compound, 15 to 25 percent of water-soluble organic solvent, 0.2 to 0.5 percent of alkanolamine substance, 0.03 to 0.05 percent of metal protective agent and the balance of deionized water, the quaternary ammonium salt compound is prepared by the following steps: reacting 6-heptene-1-alcohol with ethylene oxide to obtain a compound 1, carrying out amidation reaction on allyl glycidyl ether and dimethylamine to obtain a compound 2, and carrying out chlorination reaction on sodium 2-chloroethanesulfonate and the compound 2 to obtain a compound 3; and finally polymerizing the compound 1 and the compound 3 under the initiation action of azodiisobutyronitrile. All the components in the stripping liquid have a synergistic effect, so that the photoresist is effectively stripped, and the stripping liquid is free of residues, more efficient and good in corrosion-resistant effect.

The invention provides a gel-state polymer electrolyte based on a deep-eutectic solvent, a preparation method of the gel-state polymer electrolyte and a quasi-solid-state lithium battery, and belongs to the technical field of lithium batteries. The preparation method of the gel-state polymer electrolyte comprises the following steps: obtaining a liquid-state DES electrolyte containing a lithium salt and a co-solvent; the preparation method comprises the following steps: carrying out a prepolymerization reaction on a mixture containing a liquid DES electrolyte, a liquid monomer, a cross-linking agent and a photoinitiator to obtain a prepolymerization solution; the monomers comprise fluorine-containing monomers and ether oxygen-containing monomers; under the irradiation of ultraviolet light, the pre-polymerization solution is subjected to a photocuring reaction on the surface of a matrix, and the in-situ polymerized gel-state polymer electrolyte is obtained. The photo-initiation in-situ polymerization technology involved in the invention not only promotes the high efficiency of the initiation process, but also can realize the integration of the electrode / electrolyte interface, reduce the interface impedance and improve the interface stability.

The invention relates to the technical field of photoinitiators, and provides a triplet-triplet energy transfer (TTET) free radical I type photoinitiation system, a photocuring composition and application thereof. The system comprises a boron dialkylated dipyrromethene free radical I type photoinitiator and a long wave absorption photosensitizer, the photosensitizer is preferably an osmium (II) complex, and the mass ratio of the photosensitizer to the photoinitiator is preferably 1: 5-1: 200. Under the irradiation of a 650-750 nm light source (preferably a 690 nm LED), the photosensitizer enters a triplet state through intersystem crossing and generates TTET to the photoinitiator, so that the photoinitiator is uniformly split in the triplet state to generate free radicals, thereby initiating polymerization / cross-linking curing of monomers such as (methyl) acrylate and the like. The embodiment shows that the double bond conversion rate of the TPGDA can reach more than 80% within 10 minutes under the conditions of LED at 690 nm and 80 mW / cm < 2 >.

The invention belongs to the technical field of membrane separation, and particularly relates to a monovalent selective cation exchange membrane and a preparation method thereof, the preparation method comprises the following steps: (1) mixing a first exchange monomer, a first cross-linking agent, a first solvent and a first initiator to obtain a first prepolymer solution; (2) mixing a second exchange monomer, a second cross-linking agent, a second solvent and a second initiator to obtain a second prepolymer solution; (3) coating the first prepolymer solution on a first substrate film to obtain a first composition; (4) coating a second substrate film with the second prepolymer solution to obtain a second composition; and (5) oppositely laminating the coating surfaces of the first composition and the second composition, and stripping the first substrate membrane and the second substrate membrane after initiation polymerization is completed, so as to obtain the monovalent selective cation exchange membrane.

The invention relates to the technical field of biomedical materials, and discloses a soft tissue repairing and wrinkle filling material based on N-vinylpyrrolidone and polyethylene glycol diacrylate mixed polymer hydrogel and a preparation process of the soft tissue repairing and wrinkle filling material based on N-vinylpyrrolidone and polyethylene glycol diacrylate mixed polymer hydrogel. Polyethylene glycol diacrylate; an initiator; a solvent; the preparation process comprises the following steps: S1, mixing and dissolving all materials to form a pre-polymerization solution; s2, forming hydrogel through photopolymerization and thermal polymerization; s3, carrying out dialysis on the obtained hydrogel; and S4, performing freeze drying on the dialyzed hydrogel, and performing sterilization treatment. By adopting a light and heat dual initiation system, the purpose of realizing rapid polymerization under a mild condition is achieved. Compared with a single initiation system in the prior art, the technology solves the problems of slow polymerization rate and harsh reaction conditions, so that the polymerization process is more efficient and safer.

The invention discloses a preparation method of a grafted polymer brush copolymer, which comprises the following steps: S1, mixing a styrene monomer, N-4-vinyl phenyl-N, N-dimethylamine, toluene and AIBN, heating, and reacting to generate a first section of polymer; and S2, mixing the first-section polymer with an acrylate monomer and an imide compound, and continuously reacting under an illumination condition to obtain the polymer brush copolymer. AIBN can be decomposed at high temperature to generate free radicals, polystyrene monomers are initiated to polymerize, and a first-section polymer is formed. The imide compound and a nitrogen-containing initiation site form a charge transfer complex under an illumination condition. The charge transfer complex can be dissociated to generate free radicals formed by nitrogen-containing initiation sites, and then the free radicals formed by the nitrogen-containing initiation sites initiate polymerization of acrylate monomers to obtain a grafted polymer brush copolymer. The preparation method is simple in reaction condition, simple and convenient to operate and suitable for industrial large-scale production.

The invention relates to the technical field of tackifiers, and discloses a preparation method and application of an organic silicon tackifier. Vinyl isophthalic acid and epoxy chloropropane are subjected to an esterification reaction under catalysis of tetraethylammonium bromide to obtain vinyl epoxypropyl isophthalate; and carrying out polymerization reaction on the modified rosin, allyl propionate modified rosin and alkenyl silicone oil under the initiation of azodiisobutyronitrile to obtain the organic silicon tackifier. And adding the organic silicon tackifier into the base material, and uniformly mixing to obtain the silicone rubber adhesive. The organic silicon tackifier prepared by the invention contains ester groups, carboxyl groups and epoxy groups with relatively strong polarity, and is easy to chemically react with a base material or form secondary valence bonds, so that the adhesion of a silicon rubber adhesive is enhanced, and the organic silicon tackifier is easy to tangle with each other after being added into silicon rubber to form a network structure, so that the mechanical property of the silicon rubber is enhanced. The tackifier prepared by the invention has excellent mechanical property and adhesive property when being applied to silicone rubber.

The invention discloses an oxidation-resistant monomer casting nylon material and a preparation method thereof, and relates to the field of material preparation, and the monomer casting nylon material is applied to a high-temperature and oxygen-enriched environment and comprises the following components in parts by mass: 100 parts of caprolactam; 0.1-0.3 part of a catalyst which is one of sodium hydroxide, potassium hydroxide or lithium hydroxide; 0.5 to 1.5 parts of an activating agent, wherein the activating agent is N-acetyl caprolactam; 0.7 to 3 parts of a main antioxidant, wherein the main antioxidant comprises a hindered phenol antioxidant and a thioester antioxidant; 0.1-0.5 part of an auxiliary antioxidant, which is a metal deactivator; 1-3 parts of an inorganic filler which is modified montmorillonite; and 0.5-2 parts of a hydrophobic agent which is a silane coupling agent. By constructing a composite anti-oxidation system, multi-level synergistic protection can be formed for three key oxidation stages of free radical initiation, peroxide accumulation and metal catalysis, and a full path of an oxidation chain reaction is covered from a molecular level, so that the aging process of the material is remarkably delayed, and the service life of the material is prolonged. And high oxygen resistance and relatively long service life are provided for nylon application under severe working conditions.

The invention relates to the technical field of polymer microspheres, in particular to a thermal expansion microsphere and a preparation method and application thereof. The thermal expansion microsphere comprises a polymer shell and an inner core coated in the shell, the inner core comprises a foaming agent, and the thermal expansion microsphere is characterized in that the polymer shell is formed by polymerization reaction of a monofunctional monomer and a cross-linking agent under the initiation of an initiator; wherein the difference value between the 10-hour half-life period temperature of the initiator and the peak exothermic temperature of the cross-linking agent is 60-81 DEG C. By controlling the decomposition activity of the initiator and the reaction activity of the cross-linking agent to be matched in a specific temperature difference range, construction of a uniform cross-linked network between shell polymer chain segments is achieved, and the obtained thermal expansion microspheres have a wide expansion temperature range, good heat resistance, stable expansion behavior and high expansion rate.

This invention relates to the field of acrylic resin technology and discloses a stain-resistant polyethylene glycol-graphene-grafted acrylic resin coating. TEMPO-modified graphene is used as a polymerization carrier, and TEMPO free radicals serve as initiation sites to initiate in-situ chemical grafting polymerization of monomers such as n-butyl acrylate and acrylic acid on the graphene surface, resulting in a polyethylene glycol-graphene-grafted acrylic resin. The graphene is linked to the acrylic resin through polyethylene glycol molecular chains, organically combining the graphene and acrylic resin. This improves the dispersibility of graphene, overcomes its agglomeration in the acrylic resin, and significantly enhances the tensile strength and other mechanical properties of the acrylic resin. Simultaneously, the grafted polar polyethylene glycol molecular chains improve the hydrophilicity and stain resistance of the acrylic resin.

The invention relates to preparation and low-temperature recovery methods of ester group-containing functionality-controllable epoxy resin and a composite material thereof. The method comprises the following steps: carrying out click chemical reaction on a thiol compound and carbon-carbon double bond-containing epoxide in a solvent under the initiation of 365nm ultraviolet light at the reaction temperature of 0-20 DEG C for 0.25-6 hours, and drying the solution by distillation to obtain the ester group-containing functionality-controllable epoxy resin, the molar ratio of sulfydryl to carbon-carbon double bonds in the thiol compound is 1: 1. According to the invention, an ester group-containing structure is introduced through click chemistry, and the controllability of the functionality degree of the epoxy resin is realized, so that the crosslinking density of a cured product is accurately regulated and controlled. The design not only endows a cured product with an excellent toughening effect, higher glass transition temperature and remarkably improved mechanical properties, but also endows the cured product with green and efficient degradation properties.

The invention provides a preparation method of high-impact MBS (methyl methacrylate-butadiene-styrene) resin with a gradient shell structure, which comprises the following steps: adding a butadiene / styrene core, methyl methacrylate, styrene and a proper amount of solvent into a reactor, uniformly mixing, heating to 110-130 DEG C, adding 20-40% of composite initiator, and carrying out polymerization reaction for 0.5-2 hours; cooling to 85-95 DEG C, adding 20-40% of a composite initiator, and continuously reacting for 0.5-2 hours; cooling to 60-70 DEG C, adding the residual composite initiator, and continuously reacting for 2-5 hours; and after the reaction is finished, carrying out post-treatment on the product to obtain the high-impact MBS resin. The composite initiator is composed of azodiisobutyronitrile and benzoyl peroxide, and the benzoyl peroxide accounts for 20-40% of the total amount of the composite initiator. The MBS resin with the gradient shell structure is prepared by adopting a step-by-step polymerization method and controlling the initiation rate, the bottleneck problem of toughness contradiction of the MBS resin with the core-shell structure is solved, and the MBS resin with high light transmittance and super toughness is obtained.

The present invention belongs to the technical field of preparation of new microcapsule materials, and relates to a method for preparing monodisperse microcapsules based on a microfluidic platform. Microfluidics is used to make oil phase and water phase into water-in-oil type monodisperse droplets; then the monodisperse droplets are used as templates, and after initiation by an initiator in water, free radical polymerization is carried out at the oil-water interface to generate monodisperse microcapsules with a core-shell structure; wherein the oil phase includes methyl methacrylate, n-alkane phase change material and pentaerythritol tetraacrylate, and the water phase contains polyvinyl alcohol. Based on microfluidic technology, the present invention prepares monodisperse phase change material microcapsules with thick shell, uniform particle size, smooth surface and good morphology by an external water phase initiation method. In addition, the monodisperse microcapsules prepared by the present invention have obvious transmission switch effect.

The invention relates to the technical field of gas separation membrane materials, in particular to a preparation method of a PIL-MOF composite membrane and application of the PIL-MOF composite membrane in CO2 / N2 separation.The preparation method comprises the steps that S1, a PET base membrane is pretreated, specifically, the PET membrane is soaked in a 3M HNO3 solution for 8-12 hours, washed with deionized water to be neutral and then dried; s2, in-situ growth of UiO-66-NH2: dissolving zirconium tetrachloride in acetic acid, preserving heat at 80 DEG C for 0.5-1.5 hours, cooling, adding DMF and 2-aminoterephthalic acid to form a precursor solution, dipping the pretreated PET film for 1-3 hours, and performing solvothermal reaction at 110-130 DEG C for 18-24 hours to obtain a PET / UiO-66-NH2 film; and S3, photo-initiation polymerization: coating the surface of the PET / UiO-66-NH2 film with a solution containing [VBIM] [BF4], a cross-linking agent and a photoinitiator, carrying out 365 nm ultraviolet light curing for 0.5-2 h, and drying to obtain the PIL-MOF composite film. The composite membrane combines the porous characteristic of the metal organic framework and the functional characteristic of the ionic liquid, and has application value in the fields of gas separation, catalysis and the like; the preparation process is simple, the interface bonding strength is high, and the product performance is stable.

The invention discloses a soil-improving growth-promoting modified lignin soil conditioner and a preparation method thereof, and belongs to the technical field of high polymer materials and soil improvement. The modified lignin soil conditioner comprises an agent A, an agent B and an agent C, the agent A is a cationic modified lignin polymer and is prepared by graft copolymerization of lignosulfonate and a cationic monomer in a free radical initiation mode; the agent B is lignin controlled-release particles and is prepared by wrapping an amino acid amphoteric regulator in the cationic modified lignin polymer and another negative charge natural polymer through electrostatic intercalation self-assembly; the agent C is at least one of citric acid, lactic acid, itaconic acid, fulvic acid, wood vinegar, maleic acid, maleic anhydride and polyacrylic acid. The soil conditioner disclosed by the invention has the advantages of low cost, environment friendliness and efficient repairing performance, and an innovative solution is provided for agricultural soil improvement.

The invention relates to a beta-cyclodextrin-based composite adsorption material with high selectivity as well as a preparation method and application of the beta-cyclodextrin-based composite adsorption material. The preparation method comprises the following steps: dissolving beta-cyclodextrin, an acrylamide monomer and a sodium p-styrenesulfonate monomer in water, and adjusting the pH value of the mixed solution to 6-8; adding an initiator into the obtained mixed solution, carrying out ultrasonic initiation polymerization reaction in an oxygen-free environment, and standing and curing overnight to obtain functional modified beta-cyclodextrin; dissolving the obtained functional modified beta-cyclodextrin, citric acid serving as a cross-linking agent and monopotassium phosphate serving as a catalyst in water, and heating for cross-linking reaction to obtain the beta-cyclodextrin-based composite adsorption material with high selectivity. Acrylamide and sodium p-styrenesulfonate monomers are grafted on beta-cyclodextrin through ultrasonic polymerization for chemical modification, then the characteristic that beta-cyclodextrin is easy to dissolve in water is changed through citric acid crosslinking, and the selective adsorption capacity of the obtained composite adsorption material to fluoroquinolone antibiotics is greatly enhanced.