1654 results about "Radical polymerization" patented technology

The present invention relates to the technical field of coatings. Disclosed are a coating composition having mold-proof and antibacterial properties and a preparation method therefor. The coating composition comprises the following raw materials: an acrylic resin emulsion, a curing agent, a coalescing agent, a defoaming agent, and a leveling agent, wherein the acrylic resin emulsion is prepared from an acrylate monomer, a cross-linking agent, and fluorine-containing silicone oil by means of free radical polymerization under the action of an initiator. A gemini-type quaternary ammonium salt functional group in the structure of the cross-linking agent can enable the coating to have good mold-proof and antibacterial effects, the presence of the ether bond can enable the coating to have better adhesive force, and the presence of the fluorine-containing silicone oil can enable a coating film formed by curing the coating to have a super-hydrophobic surface, thereby avoiding surface moisture which promotes bacterial growth and reproduction, and endowing the coating with antifouling and self-cleaning effects. In addition, the silicon-oxygen bond in the silicone oil can effectively enhance the heat resistance of the coating, thereby facilitating further application of the coating in indoor decoration.

The invention discloses a phase change energy storage waterborne polyurethane nanofiber membrane and a preparation method thereof. Lignin-based phase change microcapsules are prepared by combining ultraviolet crosslinking with lignin shell packaging, and then the nanofiber membrane containing the phase change microcapsules is prepared through an electrostatic spinning technology. And finally, constructing the waterborne polyurethane phase change fiber membrane with asymmetric wettability through a low-temperature plasma technology. According to the invention, lignin is self-assembled to form nanoparticles, and ultraviolet light induces free radical polymerization to form a polymer film, so that the packaging capability of the phase change material is improved. The phase change microcapsule prepared by the method is high in packaging efficiency and excellent in phase change performance, the preparation process is green and environment-friendly, the technological operation is simple, the temperature of the prepared phase change energy storage waterborne polyurethane nanofiber membrane conforms to the comfortable temperature range of a human body, and the phase change energy storage waterborne polyurethane nanofiber membrane has excellent temperature regulation, waterproof and moisture permeable performance and is suitable for being used in the field of water treatment. Good application prospects are realized in the field of functional textiles with functions of intelligent temperature regulation, water resistance and air permeability and the like.

The invention relates to a flexible aqueous binder for a lithium battery negative electrode and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a flexible polyurethane prepolymer containing vinyl by taking hydroxyl-terminated polybutadiene, isocyanate and hydroxyl acrylate as main raw materials; vinyl-containing compounds such as water-soluble acrylic acid (salt) or acrylamide, oil-soluble acrylic ester or acrylonitrile and the like are used as monomers and are combined with a flexible polyurethane prepolymer to prepare the negative water-based binder with flexible cross-linking points through free radical polymerization. The aqueous binder prepared by the technical method provided by the invention can realize point-to-point and point-to-line bonding modes with a pole piece active substance on a microstructure, so that the bonding strength of the active layer material and a copper foil is improved on the premise of not influencing the electrolyte resistance of the binder; and the flexibility of the negative pole piece and the subsequent processing stability are obviously improved.

The invention discloses a preparation method of EVOH, and relates to the technical field of EVOH. By constructing a methanol / methyl acetate binary complex solvent system and combining the dynamic characteristics of the polymerization reaction, a strategy of staged gradient regulation and control of the solvent composition proportion is implemented, the volume ratio of methanol to methyl acetate is dynamically regulated at different stages of the polymerization reaction, and the free radical polymerization self-acceleration phenomenon is inhibited; compared with the traditional single solvent polymerization process, the prepared EVOH has the characteristics of high molecular weight, narrow molecular weight distribution and high product quality.

The invention discloses a hydrophobic and oleophobic modified epoxy resin, which is prepared from the following components in parts by mass: 2 to 5 parts of thiolactone terminated fluorinated prepolymer, 15 to 16 parts of 4, 4 '-diaminodiphenylmethane, 0.13 to 0.14 part of base catalyst, 25 to 26.5 parts of epoxy resin and the balance of tetrahydrofuran solvent, wherein the thiolactone-terminated fluorinated prepolymer is prepared from thiolactone acrylamide, fluorinated acrylate and a photoinitiator in a mass ratio of (2-3): 1: (0.07-0.09) through a free radical polymerization copolymerization chemical reaction under the induction of ultraviolet light, and the thiolactone-terminated fluorinated prepolymer is obtained; wherein thiolactone acrylamide is prepared from DL-homocysteine thiolactone hydrochloride, a NaHCO3 solution and acryloyl chloride according to the mass ratio of 1: (1.3-1.5): (1.1-1.3), the oleophobic and hydrophobic modified epoxy resin provided by the invention effectively solves the problem that an epoxy resin coating in the prior art is poor in oleophobic performance and hydrophobic performance, and the oleophobic and hydrophobic modified epoxy resin has the advantages that the oleophobic and hydrophobic properties of the epoxy resin coating are improved; therefore, the oleophobic and hydrophobic properties of the epoxy resin coating are improved.

The invention discloses a low-temperature-resistant, acid-resistant and alkali-resistant roof waterproof coating and a preparation method thereof. The coating is prepared from various raw materials such as acrylate-organosilicone copolymer emulsion and polyurethane modified acrylate resin, and a key raw material is prepared through free radical polymerization and addition polymerization reaction. The preparation method comprises the steps of pre-dispersion, auxiliary agent dispersion, pigment and filler dispersion, emulsion and functional auxiliary agent compounding, performance regulation and control and the like. The acrylate-organic silicon copolymer emulsion and the polyurethane modified acrylate resin form an interpenetrating network through physical blending and chemical crosslinking, and the low-temperature toughness of a flexible phase and the chemical resistance of a rigid phase are both achieved. In a low-temperature environment, the rigidity embrittlement of the polyurethane resin is counteracted by the flexibility of the organosilicone chain segment, so that the cracking of the coating is avoided; in an acid-base environment, a urethane bond of polyurethane and a silicon-oxygen bond of organic silicon cooperate to resist chemical erosion, molecular chain breakage is reduced, and the problem that an existing waterproof coating is insufficient in performance in the low-temperature and acid-base environment is effectively solved.

The invention belongs to the field of macromolecules, and particularly relates to a PBO fiber surface modification method for a synergistic copolymer coating through plasma treatment. According to the method, modification is designed by adopting a synergistic mechanism of plasma treatment and a functional coating: firstly, the PBO fiber is treated by oxygen plasma, a microstructure and an active group are formed on the surface of the PBO fiber, and the surface activity of the PBO fiber is rapidly improved; then coating a monomer solution containing a photoinitiator, exciting light to initiate free radical polymerization through ultraviolet irradiation, forming a random copolymer coating on the surface of the PBO fiber, and repairing the damage of oxygen plasmas to the PBO fiber structure while introducing active groups into the coating; and active groups formed by oxygen plasma treatment can enhance the adhesive force between the coating and the PBO fiber. Finally, the invention provides an environment-friendly and controllable PBO fiber surface synergistic modification technology, the intrinsic performance of the PBO fiber and the interface bonding strength are improved for a long time, and a support is provided for engineering application of the high-performance PBO fiber.

The invention provides an embolism microsphere capable of slowly releasing drugs and controlling degradation speed and a preparation method thereof, the method comprises the following steps: dissolving a dispersant in an oil phase liquid, and stirring at a first preset temperature to obtain a dispersion liquid; dissolving gelatin in water at a second preset temperature to obtain a gelatin solution; the preparation method comprises the following steps: dissolving a compound with negative electricity groups in water, and adding alkali liquor and an initiator in an ice bath to obtain a modified solution; adding the modified solution into a gelatin solution, stirring to obtain a water-phase pre-polymerized solution, dropwise adding the water-phase pre-polymerized solution into the dispersion solution, premixing, adding a cross-linking agent and a catalyst, and directly grafting negative electricity groups onto gelatin molecules in a low-temperature free radical polymerization manner to obtain an intermediate product; and performing post-treatment to obtain the embolism microspheres. According to the preparation method disclosed by the invention, a non-degradable material is not needed, negative electricity groups can be directly grafted on the surface of gelatin, so that the embolism microspheres have efficient drug loading performance and good long-period drug sustained release, and the degradation speed of the embolism microspheres is controlled.

The invention belongs to the technical field of drilling fluid, and particularly relates to a free radical polymerization water-based drilling fluid composition and a preparation method thereof. The invention relates to a core-shell composite particle-containing water reducer which comprises deionized water, salts (NaCl / KCl), alkalis (Na2CO3 and NaOH), barium sulfate and core-shell composite particles X. The particle is composed of a silicon dioxide core and a polymer shell layer, and the shell layer is formed by free radical copolymerization of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid and is covalently connected with the core through silanization treatment. Under the conditions of high salinity, strong alkali and high solid phase weighting, the drilling fluid simultaneously realizes the following effects: (1) high-density bearing and low-viscosity pumpability are realized; (2) compact plugging and water loss reduction and low formation damage flowback can be realized; and (3) stable rheology rock carrying, lubrication and friction resistance reduction. The problem that three aspects of performance are difficult to consider in the prior art is solved, and the drilling fluid is suitable for drilling of deep wells, ultra-deep wells and complex stratums and has remarkable industrial application value.

The invention relates to the field of civil engineering waterproof materials, in particular to a nano bentonite-polymer composite material with high salt tolerance and a preparation method thereof, and the nano bentonite-polymer composite material is especially suitable for a sodium-based bentonite waterproof blanket in a saline soil area or a marine environment, and the preparation method comprises the following steps: (1) preparing nano bentonite lamellar colloidal dispersion liquid; (2) introducing and mixing an electrostatic screening agent and a polymerizable monomer; (3) carrying out in-situ free radical polymerization reaction; and (4) post-treatment and finished product preparation. By constructing a three-dimensional interpenetrating hierarchical structure composed of a covalent grafted polymer network, a physically anchored electrostatic screening agent and a stripped bentonite nanosheet layer, effective protection of a bentonite core anti-seepage unit is realized, so that the adaptability and long-term stability of the material under a complex water quality condition are remarkably improved.

The invention discloses a high-concentration salt poly-zwitterionic gel electrolyte, a zinc ion battery and a preparation method. Belongs to the technical field of zinc ion batteries. The preparation method comprises the following steps: adding high-concentration zinc salt into a monomer mixed solution obtained by mixing an aqueous solution of an anionic monomer, an aqueous solution of a cationic monomer and an aqueous solution of an acrylamide monomer, and performing ultrasonic treatment to obtain a monomer-salt mixed solution; adding a free radical polymerization initiator, a cross-linking agent and a catalyst, and adjusting the pH value to 4.5-5.5 to obtain a pre-polymerization solution; and heating and polymerizing the pre-polymerized solution at 35-45 DEG C to obtain the high-concentration salt poly-zwitterionic gel electrolyte. The electrolyte provided by the invention can overcome the problem of liquid leakage, inhibit the growth of zinc dendrites and the occurrence of side reactions, solve the problem of reduction of ionic conductivity, and obtain a zinc ion battery with excellent conductivity and stability.

The invention discloses photocuring conductive hydrogel as well as a preparation method and application thereof. According to the invention, methacryloylethyl sulfobetaine (SBMA), acrylic acid (AA) and hydroxyethyl methylacrylate (HEMA) are used as comonomers, deionized water is used as a solvent, N, N '-methylenebisacrylamide (MBAA) is used as a cross-linking agent, ammonium persulfate (APS) is used as an initiator, tetramethylethylenediamine (TEMED) is used as an accelerator, and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl propiophenone (Irgacure2959) is used as a photoinitiator; the conductivity is improved by adding an ionic compound potassium chloride (KCl), and the photocuring conductive hydrogel is prepared in a free radical polymerization manner by adopting an LED-UV curing box. The conductive hydrogel disclosed by the invention has the characteristics of good adhesion property, conductivity, mechanical property and the like, and has wide application in the fields of wearable strain sensors and other flexible electronics.

The invention relates to a dispersing agent for garnet type solid electrolyte and a preparation method thereof, a special powder dispersing agent for dispersing garnet type solid electrolyte (LLZO, Li7La3Zr2O12) in an ethanol or isopropanol system is a polycarboxylic acid-polyether colorless transparent viscous liquid copolymer, and the copolymer is anchored on the surface of powder particles through the strong adsorption effect of carboxyl, so that the dispersing agent can be used for dispersing the garnet type solid electrolyte (LLZO, Li7La3Zr2O12) in an ethanol or isopropanol system. Meanwhile, the polyether chain segment realizes solvent compatibility and steric hindrance effect, the preparation method for the dispersing agent is a controllable free radical polymerization method and specifically comprises dozens of specific steps and conditions, and the dispersing agent has the advantages that the grinding particle size of the garnet type solid electrolyte can be effectively reduced, stable dispersion of powder in slurry is realized, and the dispersing effect is good. Powder agglomeration is inhibited, and the grinding efficiency is improved, so that the mass production requirement of the high-safety solid-state lithium ion battery is met.

The invention discloses an ethylene-vinyl alcohol copolymer and a preparation method thereof, and relates to the technical field of resin. According to the technical scheme, the preparation method comprises the following steps: adding ethylene, low-carbon alkane, alkyl acid ethyl ester, alkyl acid vinyl ester and a carbon-carbon skeleton initiator into a reaction kettle, and carrying out a free radical polymerization reaction; adding a polymerization inhibitor to terminate the reaction, removing low-carbon alkane, unreacted ethylene and alkyl acid vinyl ester, and preparing the reaction liquid into an alcoholic solution; adding a catalyst into the alcohol solution for saponification reaction, and then performing acid pickling, water washing and drying to obtain the ethylene-vinyl alcohol copolymer. The low-carbon alkane which is low in boiling point, easy to vaporize and high in latent heat of vaporization and the saturated alkyl acid ethyl ester with good solubility are adopted as the mixed solvent to replace a traditional alcohol solvent, so that removal and control of reaction heat are facilitated, generation of insoluble gel is reduced, a copolymer with narrow molecular weight distribution is easy to obtain, and the method is suitable for industrial production. The cost that azeotrope formed by the alcohol solvent and the monomer is difficult to separate and recover is greatly reduced, and the production efficiency is improved.

The invention relates to a method for producing a polymer composition, in which a silane-modified polymer is polymerized by free-radical chain polymerization with an ethylenically unsaturated monomer and a further ethylenically unsaturated polymer having a free-radical photoinitiator group in a polyol or a prepolymer having terminal isocyanate groups, and to a polymer composition produced by this process. The invention also relates to a method for producing moisture-curable polyurethane hot melt adhesive compositions, 1K polyurethane adhesives and 2K polyurethane adhesives on the basis of the polymer composition according to the invention. The invention also relates to moisture curable polyurethane hot melt adhesive compositions, 1K polyurethane adhesives and 2K polyurethane adhesives produced by these methods.

The invention discloses a preparation method of a negative-electrode-free solid-state lithium battery based on a double-salt polymer solid-state electrolyte, and belongs to the technical field of new energy. The method comprises the following steps: dissolving a bi-component lithium salt, adding a polymer monomer, and stirring to obtain a solid electrolyte precursor solution; secondly, adding a polymerization initiator into the precursor solution, and obtaining a solid electrolyte under a heating condition; and finally, adding the solid electrolyte between the positive electrode of the lithium ion battery and the metal current collector to prepare the negative-electrode-free solid-state lithium battery. The high-stability polymer solid electrolyte with an electrochemical stability window as high as 5.5 V is prepared by utilizing a thermal-initiated free radical polymerization reaction of acrylate, the polymer solid electrolyte is matched with an existing lithium ion battery positive electrode material and a metal current collector, and under the condition that a negative electrode active material is not used, the high-stability polymer solid electrolyte is prepared. The negative-electrode-free solid-state lithium battery with high energy, long service life and high safety is realized; the mass specific energy of the negative-electrode-free solid-state lithium battery is greater than 310 Wh kg <-1 >, the cycle life is 310 times, and the negative-electrode-free solid-state lithium battery has excellent safety under a mechanical puncture condition.

The invention relates to the technical field of concrete, and particularly discloses super-retarded concrete for an ultra-large pile and a preparation method of the super-retarded concrete. The super-retarding concrete for the ultra-large pile is prepared from the following raw materials in parts by mass: 320 to 400 parts of a cementing material, 1820 to 1960 parts of aggregate, 20 to 28 parts of an inorganic-organic hybrid retarding reinforcing agent, 7.2 to 11.6 parts of a polycarboxylate superplasticizer and 85 to 98 parts of water, the inorganic-organic hybrid delayed coagulation enhancer is prepared by carrying out in-situ free radical polymerization reaction on a hydroxyl acrylate monomer, acrylamide and nano silicon dioxide. According to the inorganic-organic hybrid retarding reinforcing agent, a hybrid substance is formed through a chemical bond, an organic phase is chelated with calcium ions to realize retarding and does not excessively inhibit cement particles, inorganic phase nano silicon dioxide has no agglomeration risk, gaps are filled, a stable product is generated to resist alkali erosion, and the super retarding performance and the long-term strength of concrete are both considered; and the service life of the ultra-large pile is prolonged.

The invention relates to a cured product of phosphonium styryl modified unsaturated resin and a preparation method thereof. The cured product is a cross-linked polymer of phosphonium styryl modified unsaturated resin and a free radical polymerization monomer; wherein the phosphonium styryl modified unsaturated resin is obtained by carrying out quaternary phosphonium reaction on phosphorus-containing unsaturated resin and 4-vinyl benzyl halide. The cured product has good flame retardant property.

The invention discloses a lignin-monofluoroacrylic polymer high-voltage lithium ion binder as well as preparation and application thereof. The binder is prepared from lignin, polyfluoroacrylic acid and copolymer thereof through esterification reaction. The preparation method comprises the following steps: firstly, preparing a monofluoroacrylic polymer through free radical polymerization, and then grafting lignin into a side chain of the monofluoroacrylic polymer by utilizing esterification reaction to form a three-dimensional network structure; the binder has the free radical scavenging capacity of lignin, and the characteristics of chelating transition metal ions and stabilizing a CEI interface of polymonofluoroacrylic acid. Compared with a commercial PVDF (Polyvinylidene Fluoride) binder, the binder material disclosed by the invention has the advantages that the adhesive force is improved by 5.6 times, and the voltage resistance reaches 4.93 V which is obviously higher than that of PVDF (4.58 V). Therefore, the binder can be used for preparing the positive electrode of the high-voltage lithium ion battery, and has remarkable performance advantages.

The invention discloses a double-response collagen-based conductive hydrogel, a medicine and a preparation and application method of the double-response collagen-based conductive hydrogel. The preparation method of the double-response collagen-based conductive hydrogel comprises the following steps: carrying out chemical modification on polysaccharide through 3-aminophenylboronic acid, and then carrying out sodium periodate oxidation treatment to obtain a dialdehyde polysaccharide grafted aminophenylboronic acid copolymer; the preparation method comprises the following steps: performing hydrazide modification on collagen through adipic acid dihydrazide, and performing free radical polymerization with aniline to obtain a hydrazide collagen grafted polyaniline copolymer; the dialdehyde polysaccharide grafted aminophenylboronic acid copolymer and the hydrazide collagen grafted polyaniline copolymer are subjected to crosslinking, and the double-response collagen-based conductive hydrogel capable of responding to glucose and the pH value is obtained. Compared with single-response conductive hydrogel, the hydrogel can specifically respond to the microenvironment of chronic diabetic wound surfaces and release antibacterial and anti-inflammatory drugs, and high-quality healing of chronic wounds such as diabetic foot ulcers and the like is promoted.

The invention discloses a preparation method and application of self-crosslinking hydrogel containing a capsaicin functional structure, and belongs to the technical field of dye adsorption materials. The capsaicin functional structure monomer is introduced into an acrylic acid system, so that the self-crosslinking of the hydrogel is realized, and meanwhile, the adsorption performance of the hydrogel is remarkably improved; mono-substituted capsaicin functional structure monomers containing carboxyl and sulfonic acid groups are used as components, a disubstituted capsaicin functional structure monomer with polyhydroxy and carboxyl is used as a cross-linking agent, the self-crosslinking hydrogel with multiple adsorption sites is successfully constructed through free radical polymerization, and the adsorption capacity and efficiency of the hydrogel are greatly improved. The hydrogel-based carbon material is obtained by carbonizing the self-crosslinking hydrogel containing the capsaicin functional structure, the adsorption performance of the hydrogel material is further improved, the obtained hydrogel-based carbon material can be desorbed and recycled in ethyl alcohol, and the service life of the hydrogel-based carbon material is prolonged. And the problem of secondary pollution of the existing hydrogel material in the acid / alkali desorption process is effectively avoided.

The invention discloses a novel marine antifouling gel coating material. The novel marine antifouling gel coating material comprises an antifouling gel monomer, a hardness modifier, an initiator and water, the antifouling gel monomer is an acrylamide series derivative compound or a polyethylene glycol derivative; the hardness modifier is a high polymer capable of providing a hydrogen bond donor or acceptor; the initiator is an organic initiator capable of initiating free radical polymerization of double bonds. The coating material provided by the invention is covalently bonded with an engineering bottom surface needing antifouling through a siloxane compound. A coating prepared from the marine antifouling hydrogel coating material provided by the invention has an excellent antifouling effect and also has excellent physical properties and adhesion strength, and the stability and durability of the antifouling coating can be ensured. In addition, due to the environmental friendliness of the material, the material has a wider application range, and powerful support is provided for the anti-fouling requirement of engineering in the ocean field.

The invention belongs to the technical field of biological medicines, and particularly discloses a lignin janus hydrogel patch as well as a preparation method and application thereof. The lignin janus hydrogel patch comprises a substrate layer and a tissue adhesion layer, wherein the substrate layer is pre-stretched, one surface of the substrate layer is subjected to hydroxylation treatment, and the tissue adhesion layer is attached to the hydroxylated surface of the substrate layer through lignin-based hydrogel and is subjected to photo-initiated free radical polymerization; the invention also discloses an application of the lignin janus hydrogel patch in preparation of a patch for promoting soft tissue defect or wound healing. In the lignin janus hydrogel patch disclosed by the invention, the lignin janus hydrogel patch has different adhesion properties, and the adhesion surface has excellent adhesion property, mechanical property and antibacterial property; after contacting with wet tissue of a wound, a strain program can be started to perform mechanical self-constriction, thereby effectively helping the wound to be closed and accelerating the repairing speed.

The invention belongs to the field of oilfield chemistry, and discloses development and a method of a gel breaker for recycling drilling fluid, and the preparation method comprises the following steps: (1) contacting chitosan with a modifier under an alkaline condition for chemical modification to obtain O-carboxymethyl chitosan; and (2) carrying out radical polymerization on the obtained O-carboxymethyl chitosan and a quaternary ammonium salt monomer in an acid environment under the action of an initiator to obtain the gel breaker.

The invention relates to the technical field of reverse osmosis membranes, and particularly discloses an anti-pollution reverse osmosis membrane and a preparation method thereof.The preparation method comprises the steps that organic amine and organic acyl chloride are used for conducting interfacial polymerization reaction on a bottom membrane to prepare a polyamide layer; the photoinitiator containing amino or phenolic hydroxyl reacts with acyl chloride groups left on the polyamide layer after interfacial polymerization, and the photoinitiator is introduced into the surface of the film; pouring a zwitterionic solution on the surface of the membrane at a constant speed, and irradiating under ultraviolet to initiate a polymerization reaction; performing heat treatment on the membrane in a drying oven to obtain the anti-pollution reverse osmosis membrane. The zwitterionic polymer is efficiently grafted on the surface of the membrane by utilizing a photo-initiation free radical polymerization strategy, compared with a traditional grafting method, the operation process is simple, the grafting speed is high (within 5min), the use of an organic solvent is reduced, and the prepared reverse osmosis membrane has excellent anti-pollution performance and huge industrial application potential.

The invention provides a high-modulus low-friction heterogeneous gel material as well as a preparation method and application thereof. The heterogeneous gel material is obtained through the steps that hydrophilic monomers are subjected to free radical polymerization in a hydrophobic polymer solution to obtain a heterogeneous polymer with a hydrophobic phase and a hydrophilic phase in a continuous phase separation structure, then the heterogeneous polymer is swelled, and the mass fraction of the hydrophobic phase in the heterogeneous polymer is 20-50%; the molecular weight of the hydrophobic polymer is 8000 to 50000 Da; wherein the tensile modulus of the heterogeneous gel material is 10 MPa-1 GPa, and the friction coefficient of the heterogeneous gel material under the contact pressure of 1 to 50 MPa is 0.005 to 0.03. The heterogeneous gel material has a bicontinuous phase separation structure, so that the technical problem that the mechanical property and the lubricity of a traditional hydrophilic material are mutually restricted and are difficult to balance can be effectively solved.

The disclosure aims to provide a method for producing a refined polytetrafluoroethylene powder, in which a short-chain fluorine compound is reduced from low-molecular-weight polytetrafluoroethylene. The disclosure relates to a method for producing a refined polytetrafluoroethylene powder, including a step of reducing a short-chain fluorine compound from a low-molecular weight polytetrafluoroethylene powder obtained by radical polymerization. The step includes at least reducing a compound represented by the following formula (1) to 179 ppb or less and a compound represented by the following formula (2) to 6900 ppb or less:         Formula (1):     (H-(CF2)m-COO)pM1 wherein m is 3 to 20; M1 is H, a metal atom, NR54 (where R5s are optionally the same as or different from each other and each represent H or a C1-C10 organic group), imidazolium optionally containing a substituent, pyridinium optionally containing a substituent, or phosphonium optionally containing a substituent; and p is 1 or 2, and         Formula (2) :     (H-(CF2)n-SO3)qM2 wherein n is 4 to 21; M2 is H, a metal atom, NR54 (where R5 is as defined above), imidazolium optionally containing a substituent, pyridinium optionally containing a substituent, or phosphonium optionally containing a substituent; and q is 1 or 2.

According to the lithium battery and the preparation method thereof provided by the invention, dual mechanisms of free radical polymerization and ring-opening polymerization are combined, a stable double-crosslinking structure gel electrolyte constructed by two polymers can be obtained in an in-situ polymerization process, and the mechanical strength and the thermal stability are improved; by regulating and controlling the ratio of an epoxy monomer to an acrylate monomer, firstly, room-temperature ring-opening polymerization is performed, so that part of in-situ gel is formed before formation, smooth formation of a gel interface is ensured, the first coulombic efficiency of the battery is not influenced, and meanwhile, the dosage of the acrylate monomer and a corresponding thermal initiator is reduced; high-temperature treatment is carried out after formation, so that the interface aging of the battery is stable, the cycle life of the battery is prolonged, the acrylate monomers are polymerized, the high temperature continues to promote the polymerization of the residual epoxy monomers, the polymerization conversion rate is favorably increased, and the high-pressure resistance and oxidative decomposition resistance of the gel electrolyte are improved.

The invention discloses high-toughness low-swelling ionic conductive hydrogel and a preparation method and application thereof, and belongs to the technical field of polymer hydrogel, and the preparation method comprises the following steps: dissolving acrylic acid, acrylamide, phytic acid and sodium carboxymethyl cellulose in deionized water, and uniformly mixing to obtain a precursor solution; removing bubbles in the precursor solution to prepare a bubble-removed precursor solution; adding an initiator and a cross-linking agent into the bubble-removed precursor solution, and stirring until the initiator and the cross-linking agent are completely dissolved to obtain a pre-polymerized solution; and carrying out free radical polymerization on the pre-polymerized solution under a preset condition to obtain the high-toughness and low-swelling ionic conductive hydrogel. Through the synergistic enhancement effect of phytic acid and carboxymethyl cellulose, the multifunctional ionic conductive hydrogel is developed, and the hydrogel has excellent mechanical properties, can realize low swelling in water and artificial seawater, and also has good conductivity. The preparation method is simple, controllable in operation and easy for industrial production.

The invention discloses a hydrophobic porous adsorption material for removing perfluorooctanoic acid in water and application of the hydrophobic porous adsorption material. The hydrophobic porous adsorption material is prepared by carrying out free radical polymerization reaction on an imidazolyl ionic liquid monomer and divinyl benzene. The hydrophobic porous adsorbent combines the advantages of good pore channel diffusion, electrostatic adsorption, hydrophobic interaction and the like, and shows excellent adsorption performance and extremely high adsorption rate under different initial concentrations of perfluorooctanoic acid. The adsorption material provided by the invention is simple in preparation method and low in cost, the adsorption performance of the adsorption material on the perfluorooctanoic acid is remarkably improved through the synergistic effect of multiple mechanisms, and the adsorption material is an effective scheme for efficiently removing the perfluorooctanoic acid.