248 results about "Solution polymerization" patented technology

The invention discloses supercritical fluid foaming polyimide wave-absorbing foam and a preparation method thereof.The thermoplastic polyimide is prepared by the steps that aromatic dianhydride, aromatic diamine and aliphatic diamine serve as comonomers, polyimide acid is generated through solution polymerization, and then high-temperature cyclization is conducted; wherein the mole number of the aliphatic diamine accounts for 10-50% of the total mole number of the diamine, and the free volume and glass transition temperature of a molecular chain are effectively regulated and controlled by introduction of the aliphatic diamine; the wave-absorbing foam is prepared by taking polyimide as a matrix, doping 1-20wt% of wave-absorbing filler, and foaming for 1-3 hours in a supercritical carbon dioxide or nitrogen environment at the temperature of 180-220 DEG C and the pressure of 9-25MPa, through molecular structure design, the adsorption capacity and impact resistance of polyimide to carbon dioxide are remarkably improved, and the prepared foam has the advantages of light weight, high porosity, uniform foam structure and excellent heat resistance, can realize effective electromagnetic wave absorption in an X wave band, and is suitable for the fields of aerospace stealth and electromagnetic compatibility protection.

The invention discloses a high-temperature-resistant, bending-resistant and high-flexibility polyimide film for flexible display and a preparation method of the high-temperature-resistant, bending-resistant and high-flexibility polyimide film. According to the polyimide film, by introducing the nano silicon dioxide particles and constructing the porous structure design, the problems that a traditional polyimide film is insufficient in stability in a high-temperature environment, cracks are likely to be generated after bending, and the flexibility is poor are effectively solved. The polyimide film disclosed by the invention is prepared by adopting a diamine monomer and a dianhydride monomer as main raw materials, adding nano silicon dioxide particles, and carrying out solution polymerization, gelation, pore regulation and control and thermal imidization processes. The obtained polyimide film has a micron-sized porous structure, keeps stable at a high temperature of 400 DEG C, does not generate cracks after being bent for 100,000 times, has tensile strength of more than or equal to 150MPa, elongation at break of more than or equal to 25% and light transmittance of more than or equal to 85%, and is suitable for a substrate material of a flexible display device.

The invention provides an ethylene maleic anhydride copolymer and a preparation and application method thereof, and the preparation method comprises the following steps: dissolving a maleic anhydride monomer in an organic solvent to form a uniformly dispersed solution system, and transferring the solution system into a high-pressure reactor; ethylene gas in a supercritical state is introduced into the solution system of the high-pressure reactor to form a uniform ethylene-maleic anhydride solution system, wherein the pressure of the ethylene gas in the supercritical state is 5-30 Mpa; adding a free radical initiator into the ethylene-maleic anhydride solution system, raising the reaction temperature, and carrying out solution polymerization reaction to obtain a reaction system; a precipitant is added into a reaction system to separate out the ethylene-maleic anhydride copolymer, ethylene and maleic anhydride in the ethylene-maleic anhydride copolymer alternately exist in the form that the molar ratio of ethylene to maleic anhydride is 1: 1, high-performance bonding composite resin can also be formed by blending the ethylene-maleic anhydride copolymer and polyethylene, and the high-performance bonding composite resin is suitable for the fields of adhesives, coatings, composite materials and the like.

The invention belongs to the technical field of supporting films, and particularly relates to an acrylate pressure-sensitive adhesive, a supporting film adhesive tape, a preparation method and application. The acrylate pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 60 to 90 parts of acrylate soft monomer, 5 to 20 parts of polar functional monomer, 5 to 20 parts of high-Tg hard monomer, 0.1 to 0.5 part of initiator, 0.5 to 3 parts of polyfunctional thermocuring cross-linking agent and a proper amount of solvent. According to the acrylate pressure-sensitive adhesive disclosed by the invention, the acrylate pressure-sensitive adhesive which has the characteristics of low modulus and high cohesion microcosmically is prepared under a solution polymerization and thermocuring process through a specific'soft monomer-hard monomer-crosslinking agent 'formula system design. The pressure-sensitive adhesive macroscopically realizes the performance balance, which is difficult to realize at the same time, among adhesion, buffering and impact resistance.

According to the invention, rigid anthracene is introduced as a framework of bridged binuclear metal, a pyridylamino binuclear metal titanium-zirconium-hafnium catalyst is constructed, and the molecular weight of the obtained polymer can be effectively improved through the synergistic effect between the binuclear metal and the steric hindrance and electronic effect on the catalyst structure; the polyolefin elastomer (POE), the isotatic polypropylene (iPP) and the propenyl elastomer (PBE) are efficiently synthesized. The pyridylamino binuclear metal titanium-zirconium-hafnium catalyst has the advantages that synthesis is simple, raw materials are easy to obtain, and the product yield is high. In copolymerization of ethylene and alpha-olefin, the catalyst shows excellent activity (5.75 * 10 < 7 > g (POE). Mol <-1 > (M). H <-1 >) and alpha-olefin selectivity (the insertion rate reaches 16.2 mol%), and the polyolefin elastomer POE with excellent performance is prepared. In propylene polymerization, the regularity of the polypropylene chain segment can be effectively regulated and controlled by adjusting the steric hindrance and the electronic effect of the catalyst, and the regularity gt is prepared with high activity (3.84 * 10 < 7 > g (PP). Mol <-1 > (M). H <-1 >); and the polypropylene material with high stereoregularity is prepared from 80 mmmm% of polypropylene with high stereoregularity. In copolymerization of ethylene and propylene, an elastomer material which takes propylene as a main material, can regulate and control the ethylene content to be 5-50 wt% and has unique characteristics of a propylene-ethylene semi-crystalline copolymer is prepared. In addition, the pyridylamino binuclear metal titanium-zirconium-hafnium catalyst also shows excellent high-temperature resistance (higher than 160 DEG C), is suitable for high-temperature solution polymerization, and can be used for preparing high-performance polyolefin elastomers. Therefore, the invention has original innovation, and provides a new direction for the development of the field of polyolefin materials.

The present application provides an all-steel snow tire tread, consisting of the following raw materials in parts by weight: 50-80 parts of natural rubber, 20-50 parts of solution polymerized styrene butadiene rubber with dual glass transition temperatures, 40-60 parts of carbon black, 10-20 parts of white carbon black with a high specific surface area, 1-2.5 parts of silane coupling agent, 5-10 parts of modified anti-wet skid resin, 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of anti-aging agent 4020, 1-3 parts of anti-aging agent RD, 1-3 parts of protective wax, 1-1.8 parts of sulfur, and 1-1.5 parts of promoter NS.

The invention provides a phosphorus-nitrogen coordinated metallocene compound and a preparation method and application thereof, the compound has a structure as shown in a formula I: in the formula I, M is selected from IVB group metals in the periodic table of elements; r1 is selected from hydrogen, halogen, C1-C10 direct or branched alkyl, and C1-C3 alkoxy; r2 is selected from hydrogen and C1-C6 straight chain or branched chain alkyl; y is selected from chlorine, C1-C3 alkyl substituted or unsubstituted by trimethylsilyl, and amino substituted by trimethylsilyl. The phosphorus-nitrogen coordinated metallocene compound provided by the invention has relatively high thermal stability, catalytic activity and comonomer insertion rate, and can realize high-temperature solution polymerization of ethylene and norbornene.

This invention discloses an amphiphilic uniform penetration inhibitor oil displacement agent, its preparation method, its application, and a method for improving oil recovery. The preparation method of the amphiphilic uniform penetration inhibitor oil displacement agent comprises the following steps: In the presence of an initiator and a solvent, sodium styrene sulfonate, acrylamide, N-ethoxymethyl-N-isobutoxymethylacrylamide, and 3-acetamino-N-ethyl-N,N-dimethylpropyl-1-amine undergo a solution polymerization reaction. The molar ratio of sodium styrene sulfonate, acrylamide, N-ethoxymethyl-N-isobutoxymethylacrylamide, and 3-acetamino-N-ethyl-N,N-dimethylpropyl-1-amine is 1:0.01–25:0.01–50:0.01–50. The solution polymerization reaction results in an amphiphilic uniform penetration inhibitor oil displacement agent with a viscosity-average molecular weight of 35 million to 40 million.

The invention relates to a method for producing copolymers by solution polymerization based on at least 1, 3-butadiene and at least one hydrocarbon which is different from 1, 3-butadiene and contains at least one olefinic double bond as monomers, using one or more organolithium compounds as initiators, wherein the polymerization is carried out at a temperature of the reaction mixture of 0 DEG C to 50 DEG C and a pressure of 0.2 MPa to 0.6 MPa, and wherein 55% to 65% by weight, based on the total mass of monomers, of 1, 3-butadiene is added to the reaction mixture; a copolymer comprising units derived from 1, 3-butadiene and units derived from, as monomers, at least one hydrocarbon different from 1, 3-butadiene and comprising at least one olefinic double bond wherein the copolymer comprises monomer units derived from 1, 3-butadiene of formulae (A), (B) and (C) wherein all of the units derived from 1, 3-butadiene present in the copolymer are units derived from 1, 3-butadiene of formula (A), (B) and (C). The proportion of (A) is at least 80 mol% among monomeric units derived from 1, 3-butadiene present in the polybutadiene, and wherein the sum of the proportions of (B) and (C) is not more than 20 mol% among all monomeric units derived from 1, 3-butadiene present in the polybutadiene, and wherein the copolymer has a number average molecular weight Mn of from 2,000 g / mol to 5,400 g / mol and a glass transition temperature TG of from-15 DEG C to 5 DEG C; and to the use of the copolymers according to the invention as reactive cross-linking agents.

The invention discloses an irradiation cross-linked biodegradable composite plastic straw and a preparation method thereof. The irradiation cross-linked biodegradable composite plastic straw is prepared from the following raw materials in percentage by mass: 40-80% of polylactic acid, 15-45% of nano inorganic filler, 0.4-1% of chain extender, 1-3% of flexibilizer, 1-3% of lubricant, 0.3-1% of nucleating agent, 0.3-1% of coupling agent, 1-10% of cross-linking agent and 0.3-1% of compatilizer. The chain extender is an epoxy group chain extender copolymer which contains 6-9 epoxy functional groups and is formed by copolymerizing glycidyl methacrylate, styrene and acrylic acid low-carbon alcohol ester through a solution polymerization or suspension polymerization process. The heat resistance of the polylactic acid composite plastic can be improved through irradiation processing, the polylactic acid composite plastic straw has higher heat resistance and does not deform in a high-temperature use environment, and pathogenic bacteria and viruses in a product are killed in the irradiation crosslinking process at the same time.

The invention relates to a polymer annealing pretreatment perovskite film, a preparation method, application and a battery. The preparation method sequentially comprises the following steps: cleaning ITO glass, and preparing an electron transport layer on the ITO glass after ultraviolet ozone treatment; transferring the substrate into a glove box, and preparing a perovskite wet film through a two-step spin-coating method; spin-coating a polymer solution on the perovskite precursor wet film, wherein the polymer comprises a hydrophobic polymer material; and the perovskite precursor wet film spin-coated with the polymer solution is transferred to an air environment outside a glove box for annealing treatment, so that a perovskite light absorption layer is formed in the annealing process, and meanwhile, the polymer solution forms a polymer water-blocking packaging layer covering the perovskite light absorption layer. The method can effectively reduce the efficiency reduction caused by the humidity problem in the annealing process of the perovskite in the air when the perovskite is prepared by a two-step method.

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

This invention provides a star-shaped functionalized solution-polymerized styrene-butadiene rubber and its preparation method. The preparation method includes the following steps: S10, under an inert atmosphere, in an organic solvent, using a conjugated diene monomer as the polymerization monomer and a substance obtained by premixing alkyl lithium with a front-end modifier as the functionalization initiator, solution polymerization is carried out to obtain a polymer precursor; S20, an active coupling agent is added to the polymer precursor to obtain a star-shaped polymer with an active core and polar functional groups at the ends of each star arm; S30, a functionalizing agent is added to the star-shaped polymer to obtain a star-shaped functionalized solution-polymerized styrene-butadiene rubber with both end-chain and mid-chain functionalization. This invention, by introducing a front-end modifier and an active coupling agent, allows the star core to retain its active center, and introduces a functionalizing agent for mid-chain modification, enhancing the interfacial bonding force between silica and styrene-butadiene rubber, thereby reducing the hysteresis loss of tire rubber and imparting it with wear resistance, fatigue resistance, and wet skid-rolling resistance balance.

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 application belongs to the technical field of solution preparation device, and provides a reaction device for preparing polyolefin by solution method.The reaction device comprises a barrel and a stirrer, the axis center of the barrel of the reaction device is provided with the stirrer, at least two groups of first heat exchangers are arranged in the barrel of the reaction device in a ring shape, the first heat exchanger comprises at least two vertical heat exchange pipes, the inlet and outlet of the first heat exchanger are located at the bottom of the reaction device, the outer wall of the barrel of the reaction device is attached with a second heat exchanger, and a baffle pipe is axially inserted into the gap between the first heat exchanger and the inner wall of the barrel of the reaction device, and the baffle pipe can destroy the flow boundary layer on the surface of the first heat exchanger and the inner wall of the barrel of the reaction device.The application aims to solve the problems of low mass transfer and heat transfer efficiency, uneven mixing, local overheating, wall hanging, fouling and poor discharge of the high viscosity solution polymer, and the problems of large number of heat exchange components in the reactor and difficult structure design.

This application discloses a high-pressure brine-resistant filtration loss reducer and its preparation method, belonging to the field of oil and gas well drilling engineering. Based on the requirements for resistance to complex salts, especially calcium and magnesium, this application optimizes the molecular structure of the high-pressure brine-resistant filtration loss reducer and introduces an acryloylmorpholine monomer, significantly improving its temperature resistance, stability, and salt tolerance. Since the copolymerization reaction of the selected monomer is relatively simple, the polymerization reaction adopts free radical solution polymerization. The prepared filtration loss reducer has achieved good performance in both laboratory and field application evaluations.

The invention relates to the field of post-treatment of polymers, and discloses a preparation method of an anionic polymer and the anionic polymer. The method comprises the following steps: in a non-polar solvent, in the presence of an initiator and a structure regulator, carrying out an anionic solution polymerization reaction on an anionic polymerization monomer to obtain an anionic polymer solution; adding organic acid to carry out first termination, adding a demulsifier solution to carry out second termination, and carrying out first sedimentation and phase separation to obtain a terminated anionic polymer solution; carrying out washing, secondary sedimentation and phase separation on the anionic polymer solution to obtain a washed anionic polymer solution; after an anti-aging agent is added, post-treatment is carried out, and an anionic polymer is obtained; the organic acid is C4-C12 monobasic fatty acid; the demulsifying agent is selected from a cationic demulsifying agent and / or a nonionic demulsifying agent. According to the preparation method, the content of residual metal lithium and the content of a terminator in the product anionic polymer can be reduced, and the quality of the anionic polymer is improved.

The continuous solution polymerization process according to an exemplary embodiment comprises: producing a product comprising a polymer through a polymerization process in a reactor; separating the product into a first solution comprising the polymer and a second solution comprising the polymer in the liquid-liquid separator; supplying the first solution to a devolatilizer and supplying the second solution separated to a solid-liquid separator (S / L separator); separating the second solution into a vapor comprising the polymer and a liquid-state polymer in the devolatilizer; separating the second solution and the vapor comprising the polymer into a solvent capable of being introduced into the reactor and a solid comprising the polymer in the solid-liquid separator (S / L separator); and introducing and recirculating the solvent capable of being introduced into the reactor into the reactor.

The invention provides an amino acid eutectic gel, a preparation method thereof and an application of the amino acid eutectic gel in preparation of glass laminated glue, and relates to the technical field of glass, the amino acid eutectic gel is obtained through polymerization of a pre-polymerization solution; wherein the prepolymerization solution comprises the following raw materials: an acrylic monomer, an amino acid eutectic solvent, a photoinitiator and a cross-linking agent. The problems that in the prior art, eutectic gel is poor in adhesion, low in strength, low in transparency, poor in ultraviolet resistance, high in inflammability and complex in process can be solved.

A continuous solution polymerization process may include producing a product including a polymer through a polymerization process in a reactor; separating the product into a first solution including the polymer and a second solution including the polymer in the liquid-liquid separator; supplying the first solution to a devolatilizer and supplying the second solution to a solid-liquid separator (S / L separator); separating the second solution into a vapor including the polymer and a liquid-state polymer in the devolatilizer; separating the second solution and the vapor including the polymer into a solvent capable of being introduced into the reactor and a solid including the polymer in the solid-liquid separator (S / L separator); and introducing and recirculating the solvent capable of being introduced into the reactor into the reactor.

The application belongs to the technical field of antibacterial agents, and relates to a polycation-pi antibacterial agent and a preparation method and application thereof. The antibacterial agent has a controllable sequence structure, a polymer main chain is composed of alternating hydrophobic segments and hydrophilic segments, guanidine salts are regularly arranged, surface positive charges are concentratedly distributed, and multiple interactions of cation-pi, hydrogen bonds and pi-pi stacking can be generated between molecules of the antibacterial agent. The preparation method is as follows: under catalyst or non-catalyst conditions, polycation guanidine salts and compounds with benzene rings in a molar ratio of 0.8-1.2:1 are subjected to melt polymerization or solution polymerization, and the polycation-pi antibacterial agent is obtained. The application is that the antibacterial agent is used to finish fabric to obtain antibacterial fabric, and the fabric is made of hydrophobic fibers. The preparation method of the antibacterial agent is simple, and the antibacterial fabric with durable antibacterial, directional moisture permeability and refrigeration effect can be prepared by using the antibacterial agent.

The present application relates to a kind of self-cleaning coating for waterproofing membrane, waterproofing membrane and its preparation method, self-cleaning coating includes water-based acrylate emulsion and water-based fluorocarbon resin emulsion;Water-based fluorocarbon resin emulsion is by first polymeric monomer in the presence of solvent and the action of initiator first solution polymerization, obtain prepolymer, then join unsaturated isocyanate monomer and obtain photo-crosslinkable prepolymer, then join photo-initiator mixture, remove solvent, emulsification preparation is obtained by adding water.The self-cleaning coating prepared by redesigning fluorocarbon resin emulsion and using water-based acrylate emulsion can be used on waterproofing membrane, realize long-lasting stain resistance, while it can greatly slow down the aging of the membrane caused by environmental factors during outdoor use, improve the long-term durability of the membrane.

The invention relates to the technical field of water-based polyurethane resin emulsion, and provides acrylate modified polyurethane resin emulsion for water-based ink with good adhesion to a plastic base material. The polyurethane resin emulsion is prepared from the following main components through solution polymerization, emulsification and solvent removal: an acrylate oligomer polyol acetone solution, polyester polyol, polyether polyol, diisocyanate, a carboxyl type hydrophilic chain extender, an esterification reaction catalyst, solvent acetone, a low molecular chain extender, a neutralization salt-forming agent and deionized water. The water-based gravure plastic ink prepared from the acrylate modified polyurethane resin emulsion provided by the invention is good in redissolvability and excellent in anti-adhesion performance, and has good adhesion to plastic (PE, BOPP, PVC, PET and the like) film substrates, and the adhesive force is tested by a transparent adhesive tape and reaches zero level. Meanwhile, the water-based plastic ink has good printability and can be applied to the fields of packaging, printing and decoration of various plastic films.

The present invention provides a reactor-blended ethylene polymer composition comprising at least two identifiable components having different structural and compositional properties, namely a first ethylene polymer and a second ethylene copolymer. The ethylene polymer composition is produced by a continuous solution polymerization process, wherein the first ethylene polymer is formed by polymerizing ethylene and optionally at least one α-olefin in a first solution polymerization reactor using a first homogeneous catalyst composition, and the second ethylene copolymer is formed by polymerizing ethylene and at least one α-olefin in a second solution polymerization reactor using a second homogeneous catalyst composition. The ethylene polymer composition of the present invention can be advantageously used in applications where an easily openable single-material packaging system is required.

The invention provides a super-stable core-shell nano array electrolyzed water catalyst and a preparation method thereof. The material is a core-shell nano array, the component of a core layer is a transition metal nitride nanosheet array loaded on foamed nickel, and transition metal nitride is obtained by high-temperature nitridation of transition metal oxide nanosheets which are synthesized by a hydrothermal method and loaded on the foamed nickel. The shell layer component is nitrogen-doped carbon, and the nitrogen-doped carbon is obtained by carrying out in-situ solution polymerization on pyrrole on the core layer structure and then carrying out high-temperature nitridation. The catalyst is applied to hydrogen production by alkaline electrolysis of water, the overpotential of alkaline hydrogen evolution reaction can be remarkably reduced, and the catalytic activity is not obviously reduced when the catalyst stably operates for one month under the current density of 1A cm <-2 >. The technology is simple in preparation process, low in cost and environment-friendly, and has a good application prospect.

The invention relates to an intrinsic flame-retardant low-dielectric epoxy resin. The molecular structure of the epoxy resin comprises a) a biphenyl group, and at least one of b) a polyphenylene oxide (PPO) group, c) a polyether sulfone (PES) group or d) a polyamide imide (PAI) group. The preparation method comprises the following steps: dissolving biphenyl epoxy resin in a solvent, adding a polymer with an active group, adding independently or in a certain proportion in a combined manner, fully dissolving, adding a catalyst, heating, and carrying out solution polymerization; and after the reaction is finished, supplementing the solvent to prepare the solvent type modified epoxy resin. The obtained product can improve the limit oxygen index of the epoxy resin, reduce the dielectric constant Dk and the dielectric loss factor Df, realize a greener and more environment-friendly flame-retardant target, and better adapt to the performance requirements of high-end electronic products on high-speed transmission and low loss of electric signals.

Provided in this disclosure are titanium complexes that contain 1) a cyclopentadienyl ligand; 2) an adamantyl-phosphinimine ligand; and 3) at least one activatable ligand. The use of such a complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene or 1-octene) and enable the production of high molecular weight copolymers (Mw greater than 25,000) at high productivity under solution polymerization conditions.

The solution polymerization method for an ethylene-alpha-olefin copolymer of the present invention can provide an ethylene-alpha-olefin copolymer having a low density of 0.90 g / cc or less and a broad molecular weight distribution of 2.0 or more, and can also produce ethylene-alpha-olefin copolymers having significantly different molecular weights according to the amount of hydrogen introduced.

A method for producing a fluoropolymer by solution polymerization or dispersion polymerization, the method including: in the presence of an initiator, a chain transfer agent, and a solvent, (i) homopolymerizing tetrafluoroethylene; or (ii) randomly copolymerizing tetrafluoroethylene and at least one of a monomer represented by the following formula (1) or a monomer represented by the following formula (2). The chain transfer agent includes at least one selected from dithioester compounds, dithiocarbamate compounds, trithiocarbonate compounds and xanthate compounds. The fluoropolymer contains 50 to 100 mol % of a polymerized unit based on the tetrafluoroethylene. The formula (1): CF2═CR1R2 wherein R1 and R2 are as defined herein, the formula (2): CH2═CR3R4 wherein R3 and R4 are as defined herein.

The invention provides a method for synchronously preparing adsorption materials with different functions by modifying waste straws, and belongs to the technical field of material science. The method comprises the following steps: mixing straw, an alkali solution 1 and a formaldehyde solution to obtain a first mixture, and then heating to carry out a reaction 1; after the reaction 1 is finished, adding a sodium sulfite solution into the reaction system to obtain a second mixture, and then heating to carry out a reaction 2; after the reaction 2 is finished, carrying out solid-liquid separation to respectively obtain a first solid and a first liquid; mixing the first solid with an alkali solution 2 to obtain a third mixture, and then heating for reaction 3; after the reaction 3 is finished, adding a first reaction solution into the reaction system, and heating for reaction 4 to obtain resin; and adding a second reaction solution into the first liquid, and heating for reaction 5 to obtain the hydrosol. According to the method, the waste liquid is subjected to solution polymerization by utilizing the solvent characteristic of straw pretreatment, so that all-component utilization of the straw and modification of the waste liquid are realized.