364 results about "Initiation" patented technology

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 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 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.

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 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 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 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.

The invention discloses an RAFT (Reversible Addition-Fragmentation Chain Transfer) reagent as well as a preparation method and application thereof, and belongs to the technical field of RAFT reagent synthesis. The general formula of the RAFT reagent is shown in the specification, r1 to R5 are selected from any one of a hydrogen atom, a methyl group, a methoxyl group and a halogen atom; and R6 is selected from any one of alkyl ester groups of C3-C6. The RAFT reagent provided by the invention has a unique molecular structure, and shows excellent rapid light response characteristics, excellent initiation efficiency and relatively high triplet quantum yield. In the dynamic process, the polymer not only shows an extremely high polymerization rate, but also has excellent chain transfer capacity, and can be used for preparing acrylate and acrylamide polymers with narrower molecular weight distribution. Due to the characteristics, rapid curing of the resin can be realized, and the resin can be applied to the field of photocuring 3D printing.

The invention discloses an elastomer enhancement strategy based on a covalent organic framework nano confinement effect, and belongs to the field of elastomer enhancement. Aiming at the defects of the existing polymer material in mechanical properties or functional characteristics, the COF is introduced into a polymerization system through a dispersion process adaptive to different polymerization reaction characteristics: in emulsion polymerization, the COF is pre-dispersed in an acrylate monomer, and then the solid elastomer is prepared through emulsification, polymerization initiation, demulsification and drying. In condensation polymerization, the COF dispersion liquid is added into the polyurethane prepolymer, and the enhanced elastomer is prepared through chain extension and curing. In free radical polymerization, a COF aqueous dispersion is blended with monomers such as acrylamide, and the composite hydrogel is prepared through thermal initiation polymerization. According to the method, the mechanical strength, the toughness and the functional characteristics of the obtained composite material are remarkably improved by utilizing the regular pore channels and the active surface of the COF.

The invention relates to a high-conductivity low-creep polyelectrolyte elastomer as well as a preparation method and application thereof. The high-conductivity low-creep polyelectrolyte elastomer is polymerizable ionic liquid directly synthesized by hydroxyl ionic liquid and alkenyl-containing acyl chloride compounds through one-step reaction; the obtained ionic liquid is mixed with a neutral chain segment, a photoinitiator and a cross-linking agent are added to form a precursor solution, free radical polymerization is initiated by ultraviolet light to obtain the polyelectrolyte elastomer, and the obtained polyelectrolyte elastomer has no obvious creep deformation under 1000 times of cyclic stretching and shows excellent mechanical stability; the high-conductivity low-creep polyelectrolyte elastomer can be used for preparing a flexible ionizing pressure sensor, the capacitance peak value of the prepared flexible ionizing pressure sensor is kept stable in 2000 cycle tests, and excellent low-drift performance is shown.

The invention discloses a photo-initiation polymerization phase change microcapsule material as well as a preparation method and application thereof. The method comprises the following steps: mixing a core material and a wall material, and adding a photoinitiator to obtain an oil phase; adding a surfactant into deionized water, and fully stirring to obtain a water phase; slowly pouring the oil phase into the water phase, and homogenizing at a corresponding rotating speed by using a homogenizer to obtain a stable emulsion; and cooling the emulsion to a corresponding temperature, irradiating with an ultraviolet lamp, centrifuging, washing with deionized water, and drying in a drying oven to obtain the phase change microcapsule. The phase change microcapsule disclosed by the invention shows a clear core-shell structure, is in a regular circle shape, and has relatively high phase change enthalpy, relatively high initial thermal weight loss temperature, controllable particle size and negligible leakage rate. When the phase change microcapsule is added into the resin, the composite material shows obvious delayed temperature rise when being heated, and the phase change material has no obvious leakage, so that a good application prospect is provided for being widely applied to thermal forming and thermal management based on high polymer materials.

The invention discloses a preparation method of high-temperature-resistant and salt-resistant polyacrylamide for oil displacement of an oil field in the technical field of oilfield chemical agents, which comprises the following steps: firstly, preparing a layered double hydroxide precursor by a hydrothermal method, modifying by polydopamine to enhance the surface adhesion, and then synthesizing a polyfunctional group sulfonated polyether ether ketone cross-linking agent containing double bonds and sulfo groups, so as to obtain the high-temperature-resistant and salt-resistant polyacrylamide for oil displacement of the oil field. Performing in-situ free radical polymerization on the three components to obtain a gradient composite modified material; then dispersing and activating the modified material, copolymerizing with acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and other monomers, controlling the temperature gradient to initiate and polymerize, adding a cross-linking agent at the later stage to reinforce a network structure, and washing, granulating, drying and crushing to obtain the product. According to the method, the temperature resistance, salt resistance and shear resistance of polyacrylamide are remarkably improved through synergistic enhancement of gradient structure design and a multi-step complex process, and the method is suitable for oil displacement application of an oil field.

The application provides an isomerized eucommia elastomer and a preparation method and application thereof. The isomerized eucommia elastomer forms cis-isoprene structure in the molecular chain through self-isomerization reaction. By regulating the content of cis structure, the regulation of the regularity of the molecular chain is realized, so that the isomerized eucommia rubber no longer crystallizes at room temperature and exhibits high elasticity. Meanwhile, the suitable regularity enables the isomerized eucommia rubber to have self-reinforcing capacity and exhibit excellent mechanical strength. The application also provides a preparation method and application of the isomerized eucommia elastomer. The isomerization modification of the eucommia rubber is carried out by using a mercapto compound or a disulfide compound under the initiation of a free radical initiator. The high-performance isomerized eucommia rubber elastomer material obtained by the application does not change the original chemical structure and polarity of the eucommia rubber, has similar structure and performance to natural rubber, can make up for the problem of insufficient yield of natural rubber, and has wide application prospects in the fields of tires, conveyor belts, sealing rings, wearable devices and the like.

The invention discloses an alkyl magnesium reagent-based active anionic polymerization initiation system and a polymerization method, and belongs to the technical field of polymer synthesis. A novel initiation system based on an alkyl magnesium reagent is developed, controllable anionic polymerization of various electron-withdrawing monomers is realized by accurately regulating and controlling reaction conditions and alkyl magnesium substituent structures, and a series of magnesium polymers with controllable molecular weight distribution are successfully synthesized. The polymerization process shows typical living polymerization characteristics, the block copolymer with a regular structure is prepared through a sequential feeding strategy, modification of multiple functional end groups can be achieved, and a new technical approach is provided for designing and synthesizing high polymer materials with specific performance. A novel alkyl magnesium initiating system which is low in cost and easy to operate is provided for active anionic polymerization, the limitation of a traditional initiating system is broken through, the magnesium polymer with magnesium ions at the tail end is synthesized, a new technical path is provided for controllable preparation of high polymer materials, and important theoretical significance and wide industrial application prospects are achieved.

The invention relates to the technical field of ultraviolet curing coatings, and discloses a rapid acrylic plate coating process based on a nano-composite coating, which comprises the following two steps of: 1, irradiating by using deep ultraviolet light with the wavelength of 254-310 nanometers, triggering a photoinduced base generator to catalyze ammonium bicarbonate to decompose, and then, carrying out irradiation by using ultraviolet light with the wavelength of 254-310 nanometers; the decomposition reaction of ammonium bicarbonate generates gas in situ to form a physical oxygen barrier layer, the endothermic effect inhibits the temperature rise, and the product ammonia gas can also catalyze the thiol-Michael addition reaction on the surface of the coating to form a chemical oxygen sealing layer; 2, a UVA-LED lamp with the wavelength of 395 nanometers is used for irradiation, main body free radical polymerization is efficiently initiated, and deep curing of the coating is achieved. Through the synergistic effect of physical oxygen isolation and chemical oxygen sealing, ultra-fast and defect-free curing can be achieved in the air without nitrogen protection, thermal damage to a thermosensitive base material is avoided, and the service life of the coating is prolonged. And the obtained coating has high hardness and high adhesive force.

The invention discloses a functionalized polycarbonate material and a preparation method thereof, and belongs to the field of high polymer materials. The material takes carbon dioxide as a green monomer, double-bond active sites are pre-buried in a polycarbonate main chain through ring-opening copolymerization, and carboxyl, amino or heterocyclic functional side chains are efficiently grafted through thiol-ene click reaction. The preparation method comprises the following steps: under the action of a composite catalyst, copolymerizing a double-bond-containing monomer, propylene oxide and COO to synthesize a precursor; and driving the sulfydryl monomer to carry out click reaction through thermal or photo-initiation. The innovation point lies in that the limitation of traditional protection / deprotection is broken through, multiple functions are integrated, hydrophilic carboxyl, antibacterial amino and conductive thiophene group have a synergistic effect, meanwhile, high mechanical strength and controllable degradability are kept, and the preparation method is suitable for the fields of biomedicine and electronics.

The invention discloses a preparation, dyeing and finishing method of an antistatic polyester fabric based on a graft polymerization technology, and relates to the technical field of high polymer material modification.The preparation method of the antistatic polyester fabric comprises the steps that S1, polyester is subjected to oil removal and impurity removal treatment; s2, preparing an organic silicon monomer; s3, preparing a multifunctional composite grafting system raw material; s4, carrying out in-situ reaction and primary graft polymerization; s5, performing photo-initiation grafting reaction to start multi-field collaboration; s6, multi-field collaboration is promoted through pulsed electric field treatment; and S7, supercritical carbon dioxide assisted post-treatment is conducted, and washing and drying are conducted. According to the preparation method disclosed by the invention, by preparing the organic silicon monomer, the problems that the synthesized organic silicon monomer is non-uniform in molecular structure, disordered in active group distribution, relatively low in purity and relatively many in impurities due to poor reaction condition control when the organic silicon monomer for grafting the polyester fabric is prepared in the prior art can be solved.

The invention discloses a two-dimensional carbon-based catalyst material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: by taking aniline as a carbon source and a nitrogen source, initiating oxidative polymerization by ammonium persulfate in a perchloric acid solution containing a metal precursor to generate metal-doped polyaniline; and heating the polymer to induce an explosion reaction so as to realize rapid stripping and carbonization of polyaniline and finally obtain the two-dimensional carbon-based material. The method provided by the invention has the advantages of low initiation temperature, extremely short reaction time and remarkable energy-saving advantage, the obtained material shows excellent catalytic performance and good stability in various systems such as energy conversion and electro-catalytic synthesis as an electrode catalyst, and the preparation process is low in raw material cost, simple to operate, low in energy consumption, small in environmental pollution and suitable for industrial production. And the method has a good large-scale application prospect.

The invention relates to the technical field of butadiene rubber production, in particular to a control method and device for a polymerization reaction process in butadiene rubber production, and the control method for the polymerization reaction process in butadiene rubber production comprises the following steps: firstly, controlling a feeding stage and an initiation stage to enable the polymerization reaction to reach a stable state of a normal polymerization reaction; when the mass of the raw material or the mass of the catalyst fluctuates, the polymerization reaction temperature of the first polymerization kettle is maintained, so that the polymerization reaction operates stably, and finally, when the water content of the raw material fluctuates, the aluminum agent formula is adjusted in advance, and the polymerization reaction is controlled to be stable by setting the proportional relation between the variable quantity of the water content of the raw material and aluminum agent formula adjustment. According to the control method for the polymerization reaction process in butadiene rubber production, the Mooney (ML (1 + 4) 100 DEG C) of the obtained butadiene rubber ranges from 41 to 49, and the Mooney is qualified.

The invention discloses a corona-resistant polyimide film based on a core-shell structure nano SiO2 (at) PS filler and a preparation method of the corona-resistant polyimide film, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: dissolving diamine in a solvent under the protection of an inert atmosphere to obtain a diamine solution; preparing a nano SiO2 (at) PS filler dispersion liquid with a core-shell structure; adding the nano SiO2 (at) PS filler dispersion liquid into a diamine solution, fully stirring, and adding dianhydride to obtain polyamide acid resin; and carrying out vacuum negative pressure defoaming on the polyamide acid resin, and then carrying out curtain coating, stretching and imidization to obtain the corona-resistant polyimide film. The preparation method comprises the following steps: carrying out surface amination on a nano SiO2 filler, fixing an ATRP (Atom Transfer Radical Polymerization) initiator, and carrying out surface initiation on ATRP grafted polystyrene to obtain a nano SiO2 (at) PS filler with a core-shell structure; the nanofiller SiO2 (at) PS can effectively avoid the agglomeration phenomenon and is easier to disperse, meanwhile, the nanofiller SiO2 (at) PS has better compatibility in a polyamide acid solution system, and the prepared corona-resistant polyimide film has more uniform corona resistance, insulation and mechanical properties.

The invention discloses a low-temperature-resistant diene composite material and a preparation method thereof, and the low-temperature-resistant diene composite material comprises the following raw materials in parts by weight: 80-100 parts of modified styrene-butadiene rubber, 5-8 parts of a modified additive and 20-30 parts of modified white carbon black. A maleimide group in a modified additive molecule reacts with a furyl group of a side chain of the modified styrene-butadiene rubber to form a D-A bond so as to form dynamic crosslinking, and a dynamic crosslinking network can dissipate energy through reversible bond fracture and recombination under the action of stress, so that continuous accumulation of stress is avoided, initiation and expansion of cracks are delayed or prevented, and the service life of the rubber is prolonged. The polysiloxane chain segment of the side chain and the long-chain alkyl group on the modified white carbon black can increase the distance between the molecular chains of the styrene-butadiene rubber and weaken the interaction force between the molecular chains, thereby creating more free volume for the movement of the chain segment at low temperature; therefore, the overall glass-transition temperature of the modified rubber is obviously reduced.

The present application relates to the field of environment-friendly materials and its preparation technology, and particularly relates to a degradable environment-friendly paper cup interior coating and a preparation method thereof. The method comprises the following steps: firstly, synthesizing polymerizable quaternary ammonium salt surfactant (RPKO-X), and then introducing the polymerizable quaternary ammonium salt surfactant and a bio-based polymer solution into a polyacrylate molecular chain by a redox initiation polymerization method, so as to obtain a degradable acrylate emulsion for paper cup interior coating. By introducing the hydrophobic monomer RPKO-X with emulsifier characteristics, a stronger crosslinking network is formed, which can significantly improve the water resistance and oil resistance of the coating. Meanwhile, by introducing the bio-based material polyvinyl alcohol 2688, the environmental friendliness of the coating is enhanced, and the rapid degradation of the coating after use is promoted. By using the redox initiation polymerization system, the method is simple to prepare, can be prepared under mild conditions, and the emulsion particle size is uniform and stable.

The application discloses a method for preparing hydrogel by rapidly initiating radical polymerization of hydrophilic monomers, and belongs to the technical field of hydrogel preparation. The method comprises the following steps: (1) uniformly mixing hydrophilic monomers with water, adding a mixed dispersion liquid of MXene and iron-based metal nanozyme material, stirring, and then obtaining a precursor solution after ultrasonic treatment; (2) adding a persulfate solution to the precursor solution, and then mixing to obtain the product. The application constructs a cascade catalytic system based on MXene and iron-based metal nanozyme. MXene can not only react with peroxide, but also promote the circulation of Fe 3+ / Fe 2+ in the iron-based metal nanozyme. The two synergistically catalyze the rapid decomposition of peroxide and initiate radical polymerization. At the same time, by utilizing various functional groups on the surface, MXene / iron-based metal nanozyme also participates in the structure bonding of the hydrogel, continuously and efficiently initiates the rapid polymerization and crosslinking of the hydrophilic monomers under mild conditions, and forms the hydrogel.

The invention belongs to the technical field of leather tanning agents, and discloses a light-color polycarboxylic oxidized lignin tanning agent and a preparation method and application thereof. The light-color multi-carboxyl oxidized lignin tanning agent is prepared by carrying out synergistic oxidation reaction on lignin, hydrogen peroxide and ozone in the presence of sodium vinylsulfonate. According to the invention, sodium vinylsulfonate is creatively introduced as an oxidation auxiliary agent, has both surface activity and free radical initiation functions, and forms an efficient synergistic oxidation system with a hydrogen peroxide / ozone system. The system can powerfully break the dense structure of lignin and remarkably promote the benzene ring opening reaction, so that the introduction efficiency of carboxyl is greatly improved. According to the synergistic oxidation system, chromophoric groups of lignin can be effectively destroyed while the lignin is deeply oxidized, deep decolorization and light appearance are achieved, the bottleneck that traditional oxidized lignin is dark in color and difficult to be used for manufacturing light-color or bright-color leather is thoroughly overcome, and the application range of a bio-based tanning agent is greatly expanded.

The invention belongs to the field of organic synthesis, and discloses a preparation method of a multi-cross-linked network polymer binder for a silicon / graphite negative electrode of a lithium ion battery. The preparation method comprises the following steps: taking an acrylic acid structural unit, a hexafluorobutyl acrylate structural unit, an acrylamide structural unit and a cross-linking agent structural unit as polymerization monomer units; the polymer is prepared through a free radical solution polymerization reaction based on photo-initiation. A photo-initiation system is adopted, a crosslinking process is controllable and multiple crosslinking is realized through a composite crosslinking system, a stable three-dimensional network based on physical crosslinking (hydrogen bonds) and chemical crosslinking (a covalent crosslinking network constructed by a strong crosslinking agent and a weak crosslinking agent) is finally constructed, formation of SEI is regulated in situ in the circulation process, and the three-dimensional network has the advantages of being simple in preparation process, low in cost and high in repeatability. Therefore, the electrochemical performance of the silicon / graphite (Si / Gr) composite negative electrode is obviously improved. In addition, the invention also provides the polymer prepared on the basis of the method and application.

The invention discloses a method for preparing a POSS (Polyhedral Oligomeric Silsesquioxane) polymer by a photo-initiation technology. The method comprises the following steps: step 1, preparing POSS-Vi dispersion liquid; step 2, preparation of a monomer emulsion; and 3, carrying out photo-initiation polymerization to obtain a target polymer. According to the method, the limitation that traditional thermal initiation is prone to implosion and long in reaction time is overcome by precisely regulating and controlling the light initiation reaction condition, and the POSS polymer with a cage-shaped multi-branch chain structure and rich in active functional groups on the side chain is prepared. The invention also provides the POSS polymer prepared by the method.