237 results about "Guanidine" patented technology

The invention discloses application of a compound shown as a formula I or salt or deuterated substance thereof in preparation of an anti-saccharification agent, in which ring A is a benzene ring or a five-membered ring containing O or S; the ring A may be substituted by m Ra, m being 0, 1, 2, 3 or 4; ra is hydroxyl, methyl, methoxyl, nitro or dimethylamino, and the deuterated substance is a partial deuterated substance and / or a perdeuterated substance. In the experiment of inhibiting generation of AGEs, compared with an Amino guanidine AG (Amino guanidine, AG), the anti-saccharification effect is obvious: under the low concentration, the anti-saccharification inhibition rate (the final administration concentration is 33 mu M) of the aromatic methylene acetone active small molecule compound protected by the invention is between 10% and 58%, and is far higher than the anti-saccharification inhibition rate (8.4%) of the Amino guanidine AG under the same final administration concentration (33 mu M), and the anti-saccharification inhibition rate (8.4%) of the Amino guanidine AG is far higher than the anti-saccharification inhibition rate (8.4%) of the Amino guanidine AG under the same final administration concentration (33 mu M) of the Amino guanidine AG. And the anti-saccharification inhibition rate of the radix codonopsis AG approaches to the final administration concentration (1mM) and is 57%. # imgabs0 #

The invention relates to daily chemical and pharmaceutical industries, in particular to a guanidyl-containing carboxymethyl chitosan quaternary ammonium salt derivative as well as a preparation method and application thereof. The chemical structural formula of the guanidyl-containing carboxymethyl chitosan quaternary ammonium salt derivative is shown in the specification. The prepared guanidyl carboxymethyl chitosan-containing quaternary ammonium salt derivative has good antioxidant activity and can be applied to preparation of an antioxidant, the preparation method is simple, convenient and efficient, the biological activity of chitosan is enhanced, the application range of chitosan is widened, and the guanidyl carboxymethyl chitosan-containing quaternary ammonium salt derivative can be widely applied to the fields of cosmetics, functional food and medicine. # imgabs0 #

The invention discloses a high-heat-power thermoelectric cell hydrogel for low-grade heat energy collection and a preparation method thereof, and belongs to the technical field of heat energy recovery. The polyacrylamide hydrogel is selected as a substrate of the thermoelectric cell hydrogel, so that a hydrogel internal structure which is easy to regulate and control can be obtained; excellent hydrogel stretchability is obtained by using a cross-linking agent and an initiator with relatively low concentration; potassium ferricyanide and potassium ferrocyanide are used as redox ions to generate a thermoelectric effect, so that stable P-type thermal power is obtained; by using guanidine hydrochloride, the solvation entropy difference between potassium ferricyanide and potassium ferrocyanide is enlarged, and the thermal power of the hydrogel in the thermoelectric cell is greatly improved; sodium pyrrolidone carboxylate is used, so that the concentration of ions in the hydrogel is further improved, the conductivity of the thermoelectric cell hydrogel is improved, meanwhile, a hydrogen bond network between water molecules is destroyed, and the water-retaining property of the thermoelectric cell hydrogel is improved.

The present application relates to the field of fine chemical industry, and particularly to a preparation method of sodium tetrafluoroborate; the present application uses hydrofluoric acid, boric acid and soda to prepare sodium tetrafluoroborate; the present application uses evaporation, polar organic solvent dissolution, separation, modified polytetrafluoroethylene membrane fine filter filtration, cooling crystallization and the like to purify sodium tetrafluoroborate; the present application uses a polytetrafluoroethylene membrane filter core, vinyl guanidine, sodium acrylate, 1-allyl-3-ethyl imidazole tetrafluoroborate, an initiator and deionized water to prepare a modified polytetrafluoroethylene membrane filter core; the modified polytetrafluoroethylene membrane filter core prepared by the present application can effectively improve the purity of sodium tetrafluoroborate; the present application has the characteristics of low cost, simple process, low toxicity and environmental friendliness; the present application has mild reaction conditions in the preparation process, is easy to operate, has low energy consumption and high product purity.

The invention relates to a synthesis method of room-temperature vulcanized methyl phenyl silicone rubber, and belongs to the field of preparation of high polymer materials. The preparation method comprises the following steps: adding alpha, omega-dihydroxy polydimethyldiphenylsiloxane with high phenyl content and low polymerization degree, dimethyl cyclosiloxane and an alkaline resin catalyst into a reaction kettle, stirring, heating and reacting; after the reaction is finished, removing low-boiling-point substances in vacuum to obtain room-temperature vulcanized methyl phenyl silicone rubber; the preparation method comprises the following steps: preparing D201 ion exchange resin (quaternary ammonium salt type), 1-allyl cyclopropanesulfonyl chloride, zinc chloride, bis (1-vinyl imidazole-2-) ketone, mercaptoethyl guanidine dihydrobromide, triethylamine and dichloromethane, so as to obtain guanidine-doped D201 ion exchange resin; loading guanidine-doped D201 ion exchange resin into an ion exchange column for transformation to obtain an alkaline resin catalyst; the room-temperature vulcanized methyl phenyl silicone rubber prepared by the invention has excellent mechanical properties.

The invention discloses PP (polypropylene) plastic for automotive trim, which is prepared from the following raw materials in parts by weight: 90 to 100 parts of polypropylene, 8 to 12 parts of POE (polyolefin elastomer), 20 to 25 parts of modified talcum powder, 5 to 8 parts of compatilizer, 0.7 to 1.1 parts of lubricant and 0.4 to 0.7 part of heat stabilizer, according to the modified talcum powder, talcum powder is adopted as a raw material, ZnO / TiO2 is introduced to the talcum powder through a hydrothermal method, and then 5-amino-2-mercaptobenzimidazole and 1-(4, 6-diamino-1, 3, 5-triazine-2-yl) guanidine are sequentially introduced in a chemical bond mode. The PP plastic has excellent ultraviolet aging resistance, lasting antibacterial property, good dimensional stability and excellent mechanical property, can meet the comprehensive requirements of automotive interior materials on weather resistance, antibacterial property, dimensional stability, toughness and other properties, and has wide application prospects.

The invention discloses a preparation method and application of a finishing agent based on guanidinoacetic acid, and relates to the technical field of textiles. According to the finishing agent prepared by the corresponding method, the used guanidinoacetic acid is an amino acid analogue and can be used as a food additive, so that the finishing agent is harmless to a human body in a use process, and the finishing agent is simple in preparation method, short in synthesis period, simple in post-treatment, high in yield and easy for industrial production; according to the finishing agent disclosed by the invention, guanidinoacetic acid is applied to the field of fabric finishing for the first time, and after the finishing agent based on guanidinoacetic acid is applied to the fabric, the finished fabric is endowed with three properties, namely flame retardance, hydrophobicity and ultraviolet resistance, and the mechanical properties of the finished fabric are enhanced.

The invention provides metal organic framework loaded guanidyl polymer nanoparticles as well as a preparation method and application thereof. The nanoparticles comprise a copper-based metal-organic framework material and a guanidyl-containing polymer loaded on the surface of the copper-based metal-organic framework material; the copper-based metal-organic framework material comprises a copper trimesic acid complex, the copper trimesic acid complex has a porous structure and an octahedral structure, and the guanidyl-containing polymer is distributed in the porous structure and on the surface of the octahedral structure; the nanoparticles are insoluble in water, and the particle size of the nanoparticles is nanoscale. When the antibacterial agent is added into the resin, the non-dissolution antibacterial coating can be prepared, the guanidyl-containing polymer is not easy to dissolve out, the antibacterial coating is endowed with good antibacterial property, and the problems that the hydrophilic guanidyl-containing polymer and the coating resin are poor in compatibility and easy to leach out are solved.

The invention discloses an antibacterial and anti-ultraviolet polyester master batch and a preparation method thereof, relates to the technical field of polyester resin, and aims to improve the antibacterial performance and the anti-ultraviolet performance of a polyester material, an antibacterial and anti-ultraviolet intermediate is prepared and added into the polyester material; according to the preparation method, a guanidyl structure with antibacterial performance and benzophenone and triazine ring structures with anti-ultraviolet performance are introduced into an antibacterial and anti-ultraviolet intermediate, so that the anti-ultraviolet performance of the antibacterial and anti-ultraviolet intermediate is improved, and the antibacterial and anti-ultraviolet intermediate reacts with ethylene glycol and other raw materials; therefore, an antibacterial and anti-ultraviolet structure is introduced into a polyester chain segment, the antibacterial performance and the anti-ultraviolet performance of polyester are enhanced, and the use performance of a polyester material is improved.

The invention discloses a magnetic bead method endotoxin-free plasmid extraction kit, relates to the technical field of plasmid extraction and endotoxin removal, including: solution I, solution II, solution III, magnetic bead liquid I, magnetic bead liquid II, cleaning solution and eluent; solution I includes: sucrose, EDTA, Tris-HCl, NaCl; solution II includes: KO H, SDS, EDTA; solution III includes: potassium acetate, sodium acetate, trehalose, pH is 5-5.6; magnetic bead liquid I includes: NaCl, sodium citrate, magnetic beads I, pH is 5.0-5.5; magnetic bead liquid II includes: guanidine hydrochloride, urea, anhydrous ethanol, isopropanol, magnetic beads II, pH is 5.5-6.5. The present invention prepares an endotoxin-free plasmid extraction kit based on a double magnetic bead method, which has the advantages of convenience, low cost and good safety, can remove endotoxins in the plasmid extraction process, and can also be used to directly remove endotoxins in plasmids, and the obtained plasmids can meet the requirements of molecular biology experiments and cell experiments such as enzyme cutting, sequencing, transfection and virus packaging. At the same time, full automation of endotoxin-free plasmid extraction can be achieved.

The invention discloses a perovskite solar cell and a preparation method thereof. The preparation method comprises the following steps: S1, preparing an inorganic halogenated metal film on the surface of a hole transport layer of a conductive substrate; s2, coating the composite solution on the surface of an inorganic halogenated metal film through a spin-coating method, and annealing to obtain a perovskite film; the composite solution comprises an organic amine salt solution and guanidyl small molecules; the organic amine salt solution comprises at least one of formamidine hydroiodate, methylamine chloride, formamidine hydrobromide, methylamine iodide or methylamine bromide; s3, preparing an electron transport layer on the surface of the perovskite thin film; and evaporating a metal electrode on the surface of the electron transport layer to obtain the perovskite solar cell. According to the invention, the perovskite solar cell is prepared by a dry-wet two-step conversion method; the guanidyl small molecules enter the thin film through diffusion, the growth quality of the thin film is improved, and the photoelectric conversion efficiency and the open-circuit voltage of a dry-wet two-step conversion method are improved.

The application belongs to the technical field of gas separation and carbon dioxide capture absorbent, and discloses a guanidinium-based deep eutectic solvent absorbent suitable for a wet environment, a preparation method thereof and CO2 capture application. The deep eutectic solvent takes 1-acetyl guanidine AG as a hydrogen bond acceptor and an alcohol amine compound as a hydrogen bond donor, and is formed into a uniform and stable liquid through heating and stirring. When the molar ratio of AG to MEA is 1:5.5 under the condition of 333.15 K and 1.0 bar, the system has a high CO2 absorption capacity, reaching 0.2278 g / g. When the water content is 10 wt%, the CO2 absorption capacity can be increased to 0.2456 g / g. The absorption rate is fast, and the absorption equilibrium can be approached in 20 min. The DESs have the characteristics of high CO2 absorption capacity, fast absorption rate, simple preparation method and good adaptability to a wet environment.

The present invention relates to a composition containing (a) a guanidine and / or an unsubstituted guanidine salt, and (b) at least one further component selected from the group consisting of 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 1, 2-benzisothiazolin-3-one, N-butyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, the cleaning agent is prepared from 2-benzisothiazolin-3-one, octyl isothiazolinone, bronopol, dibromo-nitrilopropionamide, dibromo-dicyanobutane, butyl carbamic acid iodopropynyl ester, aminomethyl propanol, aminoethyl propylene glycol, monoethanolamine, ethylhexylglycerin, hexylglycerin, 1, 2-pentanediol, 1, 2-hexanediol, 1, 2-heptanediol, 1, 2-octylene glycol, phenoxy ethanol and phenethyl alcohol. The cleaning agent is prepared from phenyl propanol, benzyl alcohol, isopropanol, ethylenediamine tetraacetic acid, (1-hydroxyethylidene) diphosphonic acid, 2-mercaptopyridine sodium oxide, 2-mercaptopyridine zinc oxide, o-phenylphenol, sorbic acid, benzoic acid, salicylic acid, lactic acid, citric acid and zinc. The invention also relates to an industrial product containing components (a) and (b), and to the use of said composition for the preservation of containers and for the preservation of industrial products. The invention also relates to the use of (a) a guanidine and / or an unsubstituted guanidine salt for improving the antimicrobial efficacy of one or more compounds selected from the group (b) described above.

The present invention discloses a preparation method of chrome-free tanned upper leather, comprising the following steps: Step 1: Re-wetting Add the prepared aqueous solution of sodium chloride and sodium bicarbonate into a drum machine, and then put in the raw hide, and rotate for 10 - 30 min; Step 2: Water washing Immerse the re-wetted raw hide in pure water and wash for 10 - 30 min; Step 3: Tanning Add water, a catalyst, and a modified tanning agent into the drum machine, and run the drum machine for tanning for 200 - 360 min; Step 4: Alkali raising Add sodium bicarbonate into the drum machine, adjust the pH to 8.0, raise the temperature to 35 °C, rotate for 4 h, stand for 5 - 20 h, and dry to obtain the upper leather; The modified tanning agent is formed by the reaction of starch, trimethylolethane triglycidyl ether, tetramethylethylenediamine, N-(2-hydroxyethyl)guanidine, and epoxypropionic acid. The purpose of the present invention is to provide a preparation method of chrome-free tanned upper leather.

This invention belongs to the field of fuel cell technology, specifically relating to a method for preparing and applying a hydrogen-bonded organic framework material with high proton conductivity constructed from carboxylic acid-aminoguanidine. The chemical formula of this organic framework material is [(CN4H7)(C 10 [O8H5], this organic framework material belongs to the triclinic crystal system. P Space group 1, cell parameters: a =7.9901(4)Å, b =9.6412(3)Å, c =9.6724(4)Å, α =96.322(3)°, β =113.876(4)°, c =93.633(3)°. The hydrogen-bonded organic framework material constructed by carboxylic acid-aminoguanidine and the composite film prepared therefrom have high proton conductivity and are highly promising proton conduction materials.

The invention relates to a reinforced product based on at least one metal reinforcement embedded in a rubber composition based on at least one diene elastomer, a reinforcing filler essentially comprising silica, a crosslinking system based on at least one peroxide compound, at least one non-elastomeric polyphenol compound comprising at least three benzene rings each bearing at least two vicinal hydroxyl groups, and at least one compound from the guanidine family. The invention also relates to a rubber article comprising such a reinforced product.

The disclosure relates to a large scale synthesis of a modified dextran conjugate, and more particularly to a dextran-guanidine-bisphosphonate conjugate wherein the bisphosphonate is an alendronate group. The disclosure relates to a large scale GMP synthesis that produces high purity, pharmaceutical grade dextran-guanidine-bisphosphonate conjugate. The present disclosure further concerns the use of said dextran-guanidine-bisphosphonate conjugate in medicines treating tumors.

The invention relates to a curable composition comprising (I) at least one silane-modified polymer and / or at least one organopolysiloxane polymer; (II) at least one aminosilane or aminosilane oligomer; (III) at least one guanidine catalyst of Formula (G1) wherein R1 is hydrogen; R2 is selected from the group consisting of optionally substituted alkyls comprising at least 3 carbon atoms, optionally substituted cycloalkyls comprising at least 3 carbon atoms, and optionally substituted C6-C18 aryl; preferably from the group consisting of optionally substituted C3-C8 alkyls, optionally substituted C3-C10 cycloalkyls, and optionally substituted C6-C18 aryl; more preferably R2 is selected from C3-C10 cycloalkyls; R3 is selected from optionally substituted alkyls comprising at least 2 carbon atoms; preferably from optionally substituted C2-C8 alkyls; R4 is selected from optionally substituted alkyls comprising at least 2 carbon atoms; preferably from optionally substituted C2-C8 alkyls; wherein R3 and R4 can be linked so as to form a 3-, 4-, 5-, 6- or 7-membered aliphatic ring, preferably a 5- or 6-membered aliphatic ring, optionally substituted with one or more substituents; and R5 is selected from the group consisting of optionally substituted alkyls comprising at least 3 carbon atoms, optionally substituted cycloalkyls comprising at least 3 carbon atoms, and optionally substituted C6-C18 aryl; preferably from the group consisting of optionally substituted C3-C8 alkyls, optionally substituted C3-C10 cycloalkyls, and optionally substituted C6-C18 aryl; more preferably R5 is selected from C3-C10 cycloalkyls; (IV) optionally, surface treated calcium carbonate; (V) optionally, surface treated silica; and (VI) optionally, at least one plasticizer. The invention also relates to adhesive, sealant, and / or coating materials comprising said composition, the use of at least one guanidine catalyst of Formula (G1) and the use of said composition.

The invention discloses a nitrogen-rich energetic ionic salt compound based on bis-(5-aminotetrazole) boron. The nitrogen-rich energetic ionic salt compound comprises bis-(5-aminotetrazole) boric acid guanidine salt (I), bis-(5-aminotetrazole) boric acid aminoguanidine salt (II) and bis-(5-aminotetrazole) borane perchlorate (III), the structural formulas of the compounds are shown as (I)-(III). The compound can be used for mixed explosives and fuel-rich propellants.

The invention relates to the field of chemical engineering, in particular to an anti-pollution reverse osmosis membrane and a preparation method thereof.The anti-pollution reverse osmosis membrane comprises a reverse osmosis membrane body, a nano TiO2 outer protection layer is arranged on the outer side surface of the reverse osmosis membrane body, a guanidyl polymerization layer is arranged on the other side surface of the reverse osmosis membrane body, a nano TiO2 inner protection layer is arranged on the outer side surface of the guanidyl polymerization layer, and the nano TiO2 outer protection layer is arranged on the outer side surface of the guanidyl polymerization layer. Comprising the following steps: S1, guiding reverse osmosis membrane raw materials into a raw material mixer according to a proportion; when the reverse osmosis membrane enters a supporting and fixing plate, a liquid scraping soft plate on the surface of one side of the supporting and fixing plate is matched to scrape most of a solution on the surface of the reverse osmosis membrane, and at the moment, a circulating heater is matched to inject high-temperature air into a circulating air pipe, so that the circulating air pipe guides hot air into an exhaust plate; and then hot air penetrates through an exhaust plate to enter a supporting and fixing plate, and is matched with inlets and outlets in the two ends of the supporting and fixing plate under the limitation of a liquid scraping soft plate.

Membranes, methods of making the membranes, and methods of using the membranes are described herein. The membrane can comprise a support layer; and a selective polymer layer disposed (e.g., coated) on the support layer. The selective polymer layer can comprise a polymer matrix comprising a polymeric fixed carrier (e.g., a polyguanidine polymer, an amine-containing polymer, or a combination thereof). The polymeric fixed carrier can have a weight average molecular weight of least 1.5 MDa, as determined by GPC. Optionally, the polymer matrix can further comprise a hydrophilic polymer and / or a mobile carrier (e.g., a guanidine-based mobile carrier, an amine-based mobile carrier, or a combination thereof) dispersed within the polymer matrix. Optionally, the selective polymer later can further include a CO2-philic ether, a graphene oxide, carbon nanotubes, or a combination thereof, dispersed within the polymer matrix. The membranes can be used to separate carbon dioxide from other gases, such as hydrogen and / or nitrogen. Also provided are methods of separating gas streams using the membranes described herein.

The invention discloses a guanidine compound containing fluorine sulfonyl as well as a preparation method and application of the guanidine compound. The invention provides fluorine-containing sulfonyl guanidine as shown in a formula 1. The fluorosulfonyl guanidine disclosed by the invention can react with phenol or amine molecules, and sulfamide guanidyl is introduced into the molecules. According to the compound, amine and phenolic compounds can be converted into aminosulfonyl guanidine and N-amidino sulfamate compounds by a process which is mild in condition, simple to operate and easy to amplify, and the substrate universality is good. # imgabs0 #

The present invention provides a guanidine-based hyperbranched polysiloxane coating corrosion inhibitor and its preparation method, a waterborne epoxy anti-corrosion coating and its application. The preparation method of the guanidine-based hyperbranched polysiloxane coating corrosion inhibitor includes: adding a catalyst to a mixed solution of γ-glycidyletheroxypropyltrimethoxysilane and triethylene glycol, raising the temperature after hydrolysis reaction, continuing dehydration reaction, and then adding 1,1,3,3-tetramethylguanidine to carry out epoxy ring-opening reaction to obtain a dark yellow thick liquid, which is the guanidine-based hyperbranched polysiloxane coating corrosion inhibitor. Compared with the prior art, the present invention uses the Schiff base (-C=N- bond) in the guanidine-based hyperbranched polysiloxane to form a stable complex with metal substrate iron ions, adsorb on the metal surface to form a passivation film, which can not only inhibit the flash rust phenomenon, but also improve the adhesion and salt water resistance of the waterborne epoxy coating. At the same time, the prepared waterborne epoxy coating has no VOC emission during construction and curing.

The application discloses a metal halide perovskite single crystal with high PLQY and a preparation method thereof, and comprises the following steps: mixing SbX3 and diphenyl guanidine hydrohalide to obtain a solute; the molar ratio of SbX3 and diphenyl guanidine hydrohalide is 1:2-5; the solute is added into a transparent glass bottle, and an organic solvent is added into the transparent glass bottle and stirred until the solute is completely dissolved to form a solution; the solution is obtained by a slow solvent evaporation method or a cooling crystallization method operation; and the metal halide perovskite single crystal is obtained. The application proposes that the diphenyl guanidine is used as a cation to form a zero-dimensional non-lead metal halide perovskite, and since the dimension of the obtained halide perovskite structure is zero, compared with one-dimensional, two-dimensional and three-dimensional, the vibration freedom degree can be improved, which is beneficial to obtain a more efficient and lower-dimensional material and is beneficial to the formation of a self-trapped exciton (STE).

The present invention discloses a solution and method for sample pretreatment, wherein the solution comprises the following components: 2wt%-5wt% guanidine hydrochloride, 2 mM-10mM EDTA, 1%-5% sodium citrate, 0.5wt%-4wt% sodium hydroxide, 0.5wt%-3wt% N-acetyl-L-cysteine, and 2wt%-10wt% trehalose. The sample pretreatment solution of the present invention can realize pretreatment of various complex samples, and after pretreatment, sample nucleic acid extraction is not affected and has high quality; the sample pretreatment method of the present invention is time-consuming, and the treated sample can be effectively preserved without tube transfer.

The application provides a method for carbon dioxide capture and hydrogenation synthesis of methanol based on a eutectic solvent, and belongs to the technical field of carbon capture and utilization. The method comprises the following steps: weighing acetyl guanidine and ethylene glycol according to a proportion, mixing the acetyl guanidine and the ethylene glycol, stirring to prepare a eutectic solvent at a given temperature, capturing carbon dioxide in flue gas by using the eutectic solvent to form a rich liquid, transferring the rich liquid into a high-pressure reaction kettle, adding a catalyst, filling in hydrogen, increasing the temperature to perform a carbon dioxide hydrogenation reaction, filtering to obtain a catalyst and a mixture of the eutectic solvent and methanol after the reaction, and performing flash evaporation on the mixture to obtain product methanol and regenerated eutectic solvent. After capturing carbon dioxide in the flue gas, the method directly performs in-situ carbon dioxide hydrogenation in the absorbent to prepare methanol, avoids problems such as high energy consumption of carbon dioxide desorption, high reaction temperature and low single-pass conversion rate in a traditional gas-solid phase reaction process, and has a simple process and easy regeneration of the eutectic solvent.

The application relates to the technical field of polyester fibers, and discloses a polyester fiber fabric preparation method, which takes N,N'-bis(2-hydroxyethyl)ethylenediamine, N,N'-di-Boc-S-methyl isothiourea and the like as raw materials, and is subjected to esterification polycondensation reaction with dimethyl terephthalate to obtain a waterproof antibacterial copolyester polymer with a similar structure to PET polyester; the waterproof antibacterial copolyester polymer contains quaternary ammonium salt, guanidine and a hydrophobic long-chain structure in the structure, can be uniformly distributed in a polyester fiber matrix, migration of antibacterial groups is avoided, and the antibacterial performance on bacteria is better; the C-F bond energy is high, fluorine atoms are more easily embedded into the polymer, the channel for water molecules to migrate to the inside of the coating is blocked, a stable protective layer can be formed on the surface of the fiber fabric, the fiber is wrapped, water permeation into the fiber is prevented, and thus the waterproof effect is achieved; meanwhile, the hydrophobic layer also has certain durability and can withstand multiple water washes without failure.

The present invention relates to a synergistic composition for the treatment of disorders related to central nervous system (CNS) excitability. The synergistic composition comprises combination of GABA receptor agonists and synaptic plasticity enhancer or salts thereof along with pharmaceutically acceptable excipients. The GABA receptor agonists are selected from the group consisting of 4-[(2R)-2,4-Dihydroxy-3,3-dimethylbutanamido]butanoic acid, 4- (Pyridine-3-carbonylamino)butanoic acid and 4-(hexadecanoylamino)butanoic acid or salts thereof. The synaptic plasticity enhancer are selected from magnesium 2- acetamidoethanesulfonate, magnesium bis (2-aminoethane-1-sulfonate), magnesium;(2S,3R)- 2,3,4-trihydroxybutanoate, N-(2-Hydroxyethyl)hexadecanamide, 1-(4-aminobutyl)guanidine and 5'-inosinic acid or salts thereof.

The invention discloses a production process of 2, 3-dichloropyridine, which comprises the following steps: by taking 2-chloropyridine as a starting material, trichloromethane as a medium and ferric trichloride as Lewis acid, carrying out chlorination reaction on 2-chloropyridine and N, N ', N'-trichloro-1, 3-diphenylguanidine, after the reaction is finished, extracting and separating liquid from the reaction mixture, filtering, washing and drying to obtain 2, 3-dichloropyridine. And combining the organic phases, concentrating under reduced pressure to obtain a crude product, and rectifying the crude product to obtain the 2, 3-dichloropyridine. According to the invention, 2-chloropyridine which is cheap and easy to obtain is taken as a starting raw material, so that the problem that main raw materials are not easy to obtain is solved. According to the method, N, N ', N'-trichloro-1, 3-diphenyl guanidine is adopted as a chlorine source, ferric trichloride is adopted as lewis acid, the chlorination reaction selectivity is high, side reactions are few, and the reaction yield is high. The yield of 2, 3-dichloropyridine can be stabilized at 90% or above, the production efficiency is high, the process is green and environment-friendly, and the method is suitable for industrial production.

This invention discloses a high-fire-resistant concrete, characterized by being composed of the following components in parts by weight: 20-25 parts cement, 30-35 parts crushed stone, 10-25 parts river sand, 10-12 parts volcanic ash, 10-20 parts water, 1-3 parts epoxy-propionic acid modified octa-tetramethylcyclotetrasilazane, 0.3-0.6 parts guanidine carbonate, 1-3 parts calcium borate, 0.5-1 part waste polyarylene diazole fiber, and 0.1-0.3 parts 3-chloro-2-hydroxypropanesulfonic acid modified 2,5-bis(diethylamino)phenyl-1,3,4-diazole. This invention also discloses a method for preparing the aforementioned high-fire-resistant concrete. The high-fire-resistant concrete disclosed in this invention exhibits high fire resistance, good workability, excellent comprehensive performance, impermeability and crack resistance, durability, and high compressive strength.