679 results about "Initiation" patented technology

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

A method for producing a fluoroelastomer is provided by which a fluoropolymer having excellent dispersion stability in water can be efficiently produced using an aqueous medium having a reduced environmental burden and without essentially requiring an emulsifier.　The method for producing a fluoroelastomer comprises polymerizing monomers including TFE and PAVE in an aqueous dispersion that contains substantially no water-soluble emulsifier and comprises an aqueous medium and a first fluoropolymer, which includes TFE units and PAVE units, thereby producing a second fluoropolymer. In the first fluoropolymer, the proportion of the PAVE units to the sum of the TFE units and the PAVE units is 20-95 mol%. In the second fluoropolymer, the proportion of PAVE units to the sum of TFE units and the PAVE units is 20-95 mol%. Before initiation of the polymerization of the monomers, the content of the first fluoropolymer is 0.01-4.0 mass% with respect to the mass of the whole aqueous dispersion.

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

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

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

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

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

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

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

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

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

The invention belongs to the technical field of polycarbosilane, and particularly relates to a synthesis method of polydimethylsilane and application of the polydimethylsilane in preparation of polycarbosilane. In the Wurtz polymerization reaction of polydimethylsilane, polar solvents such as crown ether, diethylene glycol dimethyl ether, hexamethylphosphoric triamide and polyether are added into a reaction system, and the polar solvents have a complexing effect on sodium ions, so that tight ion pairs can be promoted to become loose ion pairs, the concentration of active anions is greatly increased, and the reaction time is shortened; therefore, the initiation period of the reaction is shortened, the polymerization reaction speed is accelerated, the molecular weight of polydimethylsilane is improved, and the yield is improved; the molecular weight of the polydimethylsilane is increased, the pyrolysis activation energy of the polydimethylsilane is gradually reduced, and the prepared polycarbosilane has higher Si-H bonds, and is high in A-grade conversion rate and good in spinning performance; according to the method, original reaction equipment does not need to be changed, reaction process parameters are also in original design, and the method has practical application value.

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 discloses a polymer stationary phase carrier for DNA synthesis as well as a preparation method and application of the polymer stationary phase carrier. The polymer stationary phase carrier comprises a polymer substrate, and the surface of the polymer substrate is provided with active functional groups such as ester groups, carboxyl groups, halogen or hydroxyl groups, so that the polymer substrate can be modified; the surface of the polymer substrate is modified with a first functional group, the first functional group is covalently bonded with the polymer substrate, and the first functional group is a functional group capable of reacting with an ester group, a carboxyl group or halogen; the surface of the polymer substrate is also modified with a functional group, and the functional group is a group capable of generating a click reaction; the polymer stationary phase carrier further comprises an initiation chain coupled to the polymer substrate through the functional group; and the initiating chain is coupled with the surface of the polymer substrate with the modified functional group through the second functional group. The stationary phase carrier disclosed by the invention can be used for carrying out a biological DNA synthesis reaction, and has relatively high yield and accuracy.

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

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

The invention discloses a preparation method of sodium polyacrylate, which belongs to the technical field of food processing, and comprises the following steps: weighing a certain amount of acrylic acid, diluting with deionized water, adding into a multi-neck flask, preparing a NaOH solution with a certain concentration, stirring, adding into the flask until a neutralization reaction is completed to obtain a sodium acrylate solution, and adding the sodium acrylate solution into a reaction kettle for reaction; taking a certain amount of activated carbon for adsorption treatment, carrying out suction filtration to obtain a sodium acrylate refined solution, and repeatedly vacuumizing for multiple times; according to the method, on the basis of a redox initiator (ammonium persulfate-sodium hydrogen sulfite), a high-efficiency chain extender dimethylaminopropionitrile is added to form a composite initiation system, and the influence of the addition amount of the composite initiator, the monomer concentration, the reaction time and the reaction temperature on the viscosity of the prepared sodium polyacrylate is discussed respectively. Then, optimal preparation process conditions are determined through an orthogonal test, and the performance of the prepared sodium polyacrylate is measured, so that the practical application effect of the whole method is greatly improved.

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

The invention provides a fluorine-containing polymer wetting reversal agent suitable for shale reservoir protection as well as a preparation method and application of the fluorine-containing polymer wetting reversal agent. The preparation method of the reverse wetting agent comprises the following steps: adding ethylamine, triethylamine and deionized water into a reaction flask, and adding perfluorooctanoyl chloride into the system for reaction; after the reaction is completed, potassium hydroxide and 2-chloroethanol are continuously added for reaction; and after the reaction is completed, obtaining the N-ethyl-N-hydroxyethyl perfluorooctanamide. Adding nanoparticles, a silane coupling agent and ammonia water into the dispersant solution, and carrying out a modification reaction to obtain a modified nanoparticle solution; and adjusting the pH value of the obtained modified nanoparticle solution to 5-9, adding N-ethyl-N-hydroxyethyl perfluorooctanamide, introducing nitrogen to remove oxygen, adding an initiator, and carrying out thermal initiation polymerization reaction to obtain the composite material. The wetting reversal agent disclosed by the invention has excellent wetting reversal performance and a certain filtration reduction effect, and provides innovative thinking for development of a high-performance water-based drilling fluid technology.

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

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

The invention belongs to the technical field of silica sol, and provides high-purity silica sol and a preparation method thereof. The method comprises the following steps: mixing a lithium source, silicon powder and a first part of water to carry out an initiation reaction, adding residual water after the initiation reaction is finished, and carrying out a polymerization reaction to obtain a first product; mixing the first product with an acid solution to obtain a mixed solution; and filtering the mixed solution, and concentrating the filtrate obtained by filtering to obtain the high-purity silica sol. The preparation method comprises the following steps: by taking lithium alkylide or lithium alkoxy as an initiator and monatomic silicon powder as a silicon source, reacting with water to generate silicic acid, and further polymerizing and concentrating to prepare the sodium-free and high-purity spherical silica sol with high additional value. The mass fraction of silicon dioxide in the spherical silica sol is 25-40%, the specific gravity at the temperature of 20 DEG C is 1.1-1.3 g / cm < 3 >, the viscosity at the temperature of 25 DEG C is 10-50000 cP, and the particle size is 10-20 nm.

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 present invention provides a flame retardant mixture, aluminum diethylphosphinate and a preparation method therefor. The preparation method includes: heating a sodium hypophosphite solution to a first temperature, dropwise adding an initiator, introducing ethylene, maintaining a pressure at 0.30-0.75 MPa, and carrying out an initiation reaction until the reaction is completed; and adjusting the solution to a second temperature, dropwise adding an aluminum sulfate solution for a reaction under heat preservation at normal pressure, performing filtration, and collecting a precipitate to obtain aluminum diethylphosphinate containing a telomer. According to the present invention, an initiator with strong oxidability is not used, such that oxidation of a hypophosphite in a reaction system and subsequent products brought thereby are reduced, for example, aluminum phosphate, aluminum phosphite, aluminum ethylphosphonate and the like are not generated as a result of the reaction. The present invention can be implemented at a relatively low temperature and a relatively low pressure, realizing high-efficiency conversion. The present invention is easy to operate and uses water as a solvent, hazardous materials requiring disposal are not generated or contained after completion of a chemical reaction, raw materials are readily available, and industrial production can be achieved without the need for special devices.

The invention discloses a pretreatment method of organic wastewater, and relates to the technical field of sewage pretreatment. The pretreatment method comprises the following steps: adopting a Fenton-flocculation method, generating free radicals through a Fenton reaction to initiate a polymerization reaction of organic matters in the organic wastewater to generate an organic polymer, and removing the organic polymer through flocculent precipitation and aging; the organic matter is an organic polymer monomer which can be subjected to polymerization reaction under the initiation of free radicals. The Fenton-flocculation method provided by the invention is different from a free radical degradation principle of Fenton reaction treatment of wastewater in the prior art, a lot of free radicals are generated through Fenton reaction for polymerization reaction, small organic molecules are subjected to reverse polymerization to form a macromolecular polymer, the macromolecular polymer is removed through flocculent precipitation, and the wastewater treatment efficiency is improved. The purpose of reducing the COD value of the organic wastewater with high efficiency and low cost is achieved, and the method has the advantages of being easy to operate, free of complex equipment and technology and easy to implement and maintain.

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

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

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

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

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