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175 results about "Trithiocarbonic acid" patented technology
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Thiocarbonic acid is an inorganic acid which is related to carbonic acid. It is an unstable red oil with the chemical formula H 2 CS 3 . It is often referred to as trithiocarbonic acid so as to differentiate it from other thiocarbonates .
Vinyl-Thiocarbonate and Polyol Containing Block Copolymers
Block copolymers comprising polyols and / or siloxanes and vinyl-thiocarbonate blocks can be made by reacting a thiocarbonate compound such as a dithio- or trithiocarbonate with generally any hydroxyl-terminated polysiloxane via an esterification reaction. The polysiloxane can have a very wide number average molecular weight range and can be chain extended and / or crosslinked as by using a polyisocyanate or a polycarboxylic acid. Desirably, vinyl compounds are then reacted in situ into the thiocarbonate to increase molecular weight thereof. The block copolymers can be used in personal care applications.
Owner:LUBRIZOL ADVANCED MATERIALS INC
Functional trithiocarbonate RAFT agents
InactiveUS7230063B1Organic chemistryOrganic compound preparationTrithiocarbonic acidFree-radical addition
The present invention is directed to a free radical control agent of the structural formula:wherein R1 is a divalent alkyl group of 1 to 12 carbon atoms, R2 and R3 are each independently hydrogen or an alkyl group of 1 to 12 carbon atoms, and R4 is —OH or —COOH, with the proviso that the total carbon atoms of R1, R2, and R3 is no greater than 12; and wherein Y represents a functional group that is capable of activating a vinylic carbon toward free radical addition.
Owner:THE GOODYEAR TIRE & RUBBER CO
Controlled free radical agent for nanocomposite synthesis
InactiveUS6998452B1Increase profitLow densitySilicon organic compoundsSpecial tyresSilanesTrithiocarbonic acid
This invention relates to a process for producing a free radical control agent of the structural formula: wherein Z is selected from the group consisting of wherein R1 is an alkyl group of 1 to 4 carbon atoms, cyclohexyl or phenyl; wherein R2 is an alkoxy group of 1 to 8 carbon atoms or a cycloalkoxy group of 5 to 8 carbon atoms; wherein Alk is a divalent hydrocarbon of 1 to 18 carbon atoms; and wherein Y represents a functional group that is capable of activating a vinylic carbon toward free radical addition; said process comprising the steps of (1) reacting a mercaptosilane of the structural formula: Z-Alk-SH with carbon disulfide in the presence of a phase transfer catalyst and an alkali metal hydroxide to produce a trithiocarbonate salt; and (2) reacting the trithiocarbonate salt with a halogen containing compound of the structural formula X-Y to produce the free radical control agent, wherein X represents a halogen atom. Such free radical control agents are capable of covalently bonding to silica / silicate surfaces and are of particular benefit in producing rubbery compounds that will be loaded with silica fillers, such as tire tread rubbers.
Owner:THE GOODYEAR TIRE & RUBBER CO
S,S'-BIS-(alpha, alpha'-DISUBSTITUTED-alpha-ACETIC ACID)-TRITHIOCARBONATES AND DERIVATIVES AS INITIATOR-CHAIN TRANSFER AGENT-TERMINATOR FOR CONTROLLED RADICAL POLYMERIZATIONS AND THE PROCESS FOR MAKING THE SAME
A s,s′-bis-(α, α′-disubstituted-α″-acetic acid)-trithiocarbonate and derivatives thereof can be used as an initiator, chain transfer agent, or terminator for polymerization of monomers such as free radical polymerizable monomers. Homopolymers, copolymers, and the like as well as block copolymers can be made utilizing the trithio carbonate compound such as in a living free radical polymerization as well as to form telechelic polymers.
Owner:LUBRIZOL ADVANCED MATERIALS INC
Polymer surfactant and core-shell amphiphilic polymer microsphere as well as preparation method thereof
InactiveCN101982478ANarrow molecular weight distributionLow densityInksCoatingsChemical structurePolymer science
The invention relates to a polymer surfactant and a core-shell amphiphilic polymer microsphere as well as a preparation method thereof. The polymer surfactant is a compound containing a trithiocarbonate structure, and the chemical structure of the surfactant is shown in the specification, wherein R1 is shown in the specification; R2 represents CH3 and H; M represents Na, K, (CH3)4N and (C2H5)4N; M1 is one or a mixture of acrylic acid, methacrylic acid, acrylamide and N-vinyl pyrrolidone; M2 is one or a mixture of styrene, methyl acrylate, ethyl acrylate, butyl acrylate, isopropyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, isopropyl methacrylate, diacetone acrylamide, acrylonitrile and glycidyl methacrylate; and x is 5-20 and y is 0-50. The invention has simple synthetic route and can effectively control the size of microsphere particles, the density of surface particles and the like. The obtained solid-state powdery microsphere has the self-emulsifying characteristic.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Trithiocarbonate chain transfer agent and preparation method thereof
The invention provides a trithiocarbonate chain transfer agent which is prepared from the components of sodium hydroxide, absolute ether, alkyl hydrosulfide, carbon disulfide, dehydrating agent, maleic anhydride and a catalyst. The invention also discloses a preparation method of the trithiocarbonate chain transfer agent, comprising: mixing the above components according to the set ratio, filtering after stirring, and drying by distillation to obtain the trithiocarbonate chain transfer agent. The trithiocarbonate chain transfer agent can be used for the reversible addition cracking link transfer radical polymerization of acrylate monomers, styrene monomers, acrylate monomers and vinyl acetate monomers, and can prepare homopolymer and copolymer with definite structure and narrow molecular weight distribution. According to different kinds of used alkyl hydrosulfide, the trithiocarbonate chain transfer agent can be hydrophilic or oleophilic, so that the trithiocarbonate chain transfer agent can be suitable for different polymerizing monomers and dissolvents, and can be suitable for technologies, such as solution polymerization, emulsion polymerization, dispersion polymerization, bulk polymerization and the like.
Owner:SHENZHEN OCEAN POWER INDUSTRIAL CO LTD +3
S,S'-bis-(alpha, alpha'-disubstituted-alpha''-acetic acid)-trithiocarbonates and polymers thereof for toughening thermosetting resins
A toughener comprising a trithiocarbonate polymer having an epoxy end group is described which is utilized with various thermosettable polymers such as epoxy, polyurethane, and the like. A toughened composition is made by curing the thermosettable polymer and the toughener utilizing various curing agents.
Owner:LUBRIZOL ADVANCED MATERIALS INC
Surfactantless synthesis of amphiphilic cationic block copolymers
The present invention is directed to a method of producing an amphiphilic block copolymer, including the steps of:(1) preparing a first aqueous polymerization medium which is comprised of(a) 4-vinylpyridine,(b) a trithiocarbonate RAFT agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium by the reaction of a latent surfactant with a surfactant activator;(2) polymerizing the 4-vinylpyridine within the first aqueous polymerization medium in the presence of a first free radical initiator to produce a poly(4-vinylpyridine);(3) protonating the poly(4-vinylpyridine) to form a protonated poly(4-vinylpyridine) RAFT macroinitiator;(4) preparing a second aqueous polymerization medium which is comprised of the protonated poly(4-vinylpyridine) RAFT macroinitiator and a monomer containing ethylenic unsaturation but is exclusive of a surfactant; and(5) polymerizing the protonated poly(4-vinylpyridine) RAFT macroinitiator and monomer containing ethylenic unsaturation within the second aqueous medium in the presence of a second free radical initiator and a temperature less than 100° C. to produce an amphiphilic block copolymer of the 4-vinylpyridine and monomer containing ethylenic unsaturation.
Owner:THE GOODYEAR TIRE & RUBBER CO
Telechelic polyolefin and preparation thereof
Telechelic polyolefin of formula (I) and its derivatives: CH2=CH-(CH2)p-A-Z wherein: A represents a (co)polymer comprising at least 95 mol % of (CH2-CH2) units; Z is selected from the group comprising halogens, thiols and their derivatives, azides, amines, alcohols, the carboxylic acid function, isocyanates, silanes, phosphorous derivatives, dithioesters, dithiocarbamates, dithiocarbonates, trithiocarbonates, alkoxyamines, the vinyl function, dienes, and the group -A- (CH2)p-CH=CH2; p is a whole number between 1 and 20, most advantageously between 6 and 9.
Owner:UNIV CLAUDE BERNARD LYON 1 +2
Preparation method of glucose and temperature-responsive insulin controlled release carrier
InactiveCN103865013AWide variety of sourcesGlucose responsivePharmaceutical non-active ingredientsBiocompatibility TestingTrithiocarbonic acid
The invention relates to a preparation method of a glucose and temperature-responsive insulin controlled release carrier. 1,2-diaminoethane is used as an initial raw material, is protected through di-tert-butyl dicarbonate and then is reacted with acryloyl chloride to prepare 2-aminoethyl acrylamide, and then the 2-aminoethyl acrylamide is reacted with the reaction product 4-chloroformylphenylboronic acid pinacol ester of the 4-carboxybenzeneboronic acid to prepare the monomer N-acrylamide ethyl-4-(tetramethyl-dioxaborolan)-benzamide with glucose responsiveness. The Raft polymerization of the monomer is initiated through trithiocarbonate DDMAT, and then the obtained polymer is used as a macromolecular chain transfer agent to initiate the copolymerization of the MEO2MA and the OEGMA to obtain a block copolymer material PAEB-b-P. The block copolymer has glucose and temperature responsiveness, can control the release of the carried insulin according to the concentration of the glucose in the external environment, has biodegradability, biocompatibility and bioactivity and is widely applied in the fields of medicine controlled release carriers and biological intelligent switches. The preparation method is simple and easy, the raw material can be industrially produced, and the method has great popularization and application value.
Owner:TONGJI UNIV
Trithiocarbonate compound containing ethylene, preparation method and application thereof
InactiveCN102382230ASimple manufacturing methodMild conditionsMicroballoon preparationMicrocapsule preparationMicrosphereDouble bond
The invention discloses a trithiocarbonate compound containing ethylene, which is the compound with a structure in the formula I or II, and the ethylene is positioned between the hydrophilic chain segment and the hydrophobic chain segment of the compound. The invention further discloses a preparation method of the trithiocarbonate compound containing the ethylene, under the action of a radical initiator, the compound with the structure in the formula III or VI is firstly reacted with a water-soluble monomer with a chain link A or a chain link C, and is secondarily reacted with a monomer containing a diene double linkage, so the compound with the structure in the formula I or II is obtained; and the preparation method has the characteristics of simple preparation, strong operability, good reproducibility and the like. The invention also discloses the application of the trithiocarbonate compound containing the ethylene in preparing polymer microspheres, so the ethylene is gathered at the surfaces of the polymer microspheres.
Owner:ZHEJIANG SCI-TECH UNIV
Method for preparing olefin-based segmented copolymers
InactiveCN102858820AAdjustable lengthAdjust grafting efficiencyOrganic chemistryTrithiocarbonic acidMonomer
The present application relates to a method for preparing olefin-based segmented copolymers through reversible addition-fragmentation chain transfer (RAFT), wherein the method comprises: a step of polymerizing vinyl-based monomers through reversible addition-fragmentation chain transfer (RAFT) using a trithiocarbonate-based chain transfer agent to synthesize vinyl-based polymers; and a step of grafting the synthesized vinyl-based polymers to olefin-based polymers. The method of the present invention successfully synthesizes olefin-based segmented copolymers through the two simple above-described steps.
Owner:洪性澈
Ethylenically double bond-containing trithiocarbonate compound, its preparation method and application
The invention discloses an ethylenically double bond-containing trithiocarbonate compound with a structure of formula I or formula II, with the ethylenically double bond modified by a hydrophilic segment and an oleophylic segment. The invention also discloses a preparation method of the ethylenically double bond-containing trithiocarbonate compound. The method consists of: under the action of a catalyst, reacting a compound with a structure of formula III or formula V with methoxy polyethylene glycol, then, under the effect of a free radical initiator, reacting the obtained reaction product with a diethylenically double bond-containing monomer, thus obtaining a compound with a structure of formula I or formula II. The preparation method is characterized by simplicity, strong operability, and good repeatability, etc. The invention also discloses application of an ethylenically double bond-containing trithiocarbonate compound in preparing polymer microspheres, so that ethylenically double bonds can be enriched on the surface of a polymer microsphere, while a polymer chain within the microphere can still be a linear structure.
Owner:ZHEJIANG SCI-TECH UNIV
Artificial cell membrane materials applied to photoinduction stem grafting and synthesis method thereof
InactiveCN103483480ADoes not affect mechanical propertiesDoes not affect structural propertiesCoatingsPropanoic acidBiocompatibility Testing
The invention discloses artificial cell membrane materials applied to photoinduction stem grafting and a synthesis method of the artificial cell membrane materials. The synthesis method of the artificial cell membrane materials comprises the following steps that 2-(dodecyl trithiocarbonate)-2- methyl propionic acid, dicyclohexyl carbodiimide, 4- dimethylamino pyridine and dichloromethane are added into a flask, all the components are stirred and dissolved under the protection of nitrogen, azide ethanol is dropwise added and stirred, washing is carried out through diluted hydrochloric acid and distilled water, solvents are removed through a reduced pressure distillation method, and a yellow oily liquid a is obtained; MPC, a midbody a, azo different nitrile and absolute ethyl alcohol are added into a boiling tube and are evenly dissolved, then after the nitrogen is removed through three times of 'vacuumizing-induction of highly pure nitorgen' operations on the boiling tube, and reaction away from light is carried out on the boiling tube in a sealed mode under the protection of highly pure nitrogen; the reaction liquid is precipitated through trichloromethane / diethyl ether mixed solvents, and solid products are collected. By means of the technical scheme, the artificial cell membrane materials have good biocompatibility, achieve the various effects of restraining of protein adsorption, anticoagulation, surface lubrication and the like, and have good medical prospects.
Owner:西安维萃禾生物科技有限公司 +1
Mineral Dispersants and Methods for Preparing Mineral Slurries Using the Same
A mineral slurry comprises mineral particles in an amount equal to or greater than about 60 percent by total weight of the slurry, wherein 85 percent of the mineral particles have an average particle size equal to or less than 2 micrometers; a polyelectrolyte dispersant derived from an acrylate polymer formed by reversible addition-fragmentation chain transfer polymerization, wherein the polyelectrolyte dispersant comprises endgroups comprising thio-containing residues derived from a trithiocarbonate chain transfer agent, wherein the polyelectrolyte dispersant is in an amount less than about 35 pounds of the dispersant per ton of dry mineral particles, and wherein the polyelectrolyte dispersant has a molecular weight of 3000 to 10,000 Daltons and a polydispersity of at least 1.0 and less than 1.5; and the remainder water.
Owner:KEMIRA OY
Preparation method of cationic type fluorine-containing soap-free emulsion
The invention discloses a preparation method of a cationic type fluorine-containing soap-free emulsion. The preparation method comprises the steps: using azodiisobutyronitrile, 2-(dimethylamino)ethyl methacrylate, 1,4-dioxane, S-1-dodecyl-S'-(alpha,alpha''-dimethyl-alpha''-acetic acid)trithiocarbonate to prepare poly[2-(dimethylamino)ethyl methacrylate]; purifying poly[2-(dimethylamino)ethyl methacrylate] for two times with n-hexane, and drying to obtain a product after purification; dissolving the product after purification in diluted hydrochloric acid, and forming a mixed solution; preparing an amphiphilic block copolymer from the mixed solution, 2,2'-azobis[2-methylpropionamidine]dihydrochloride, a hexafluorobutyl acrylate agent and deionized water; and combining the prepared mixed monomer with the amphiphilic block copolymer and an initiator aqueous solution to prepare the cationic type fluorine-containing soap-free emulsion. The fluorine-containing soap-free emulsion obtained by the preparation method disclosed by the invention has the characteristics of good stability, small latex particle size, and core-shell structure.
Owner:SHAANXI UNIV OF SCI & TECH
Collecting agent and ore selection method of jordisite
The invention discloses a collecting agent and an ore selection method of jordisite. The collecting agent is formed by mixing a sodium naphthalene sulfonate water solution and a butyl xanthate water solution in a weight ratio of (1-3):1, wherein the mass concentration of the sodium naphthalene sulfonate water solution is 2-4% and the mass concentration of the butyl xanthate water solution is 5-8%. The ore selection method of the jordisite disclosed by the invention comprises the following steps of: adding a raw ore containing the jordisite into a sodium trithiocarbonate water solution to carry out medicating and ore grinding, so as to obtain ore slurry of the raw ore; and adding an inhibitor and the collecting agent provided by the invention into the ore slurry of the raw ore, and carrying out flotation work to obtain a molybdenum concentrate product. The collecting agent and the ore selection method of the jordisite have the characteristics of low medicament dosage, good stability, high molybdenum grade and high recycling rate and are very suitable for the selection of the jordisite; and the grade of a molybdenum concentrate can be more than 30% and the recycling rate of the molybdenum can be more than 90%.
Owner:HUNAN ZHONGJIE TECH DEV +1
Synthesis of cyclic trithiocarbonates from epoxides
This invention provides a low cost technique for synthesizing cyclic trithiocarbonates by a simple one step process from epoxides that can be conducted under atmospheric pressure. This synthesis can be depicted as follows: wherein R represents a moiety selected from the group consisting of alkyl groups and aryl groups, wherein R′ represents a moiety selected from the group consisting of alkyl groups, aryl groups, and hydrogen atoms, and wherein R″ represents a moiety selected from the group consisting of alkyl groups, aryl groups, and hydrogen atoms, wherein the R moiety and the R′ moiety can be bonded together to form a cyclic structure, with the proviso that R″ represents a hydrogen atom if R′ represents an alkyl group or an aryl group. In this process carbon disulfide and a thiocyanate salt, such as potassium thiocyanate, are reacted with the epoxide in an ionic liquid, such as 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim] PF6) in the presence of water to produce the cyclic trithiocarbonate.
Owner:THE GOODYEAR TIRE & RUBBER CO
Preparation method for polymeric nanometer microsphere
The invention provides a preparation method for a polymeric nanometer microsphere. The preparation method comprises the following steps: with trithiocarbonate represented by a formula (I) as a chain transferring agent, carrying out RAFT living polymerization to synthesize a gradient copolymer; dissolving the gradient copolymer in an organic solvent and then adding water to form a polymeric micelle solution, wherein the organic solvent and water are intermiscible; and adding the polymeric micelle solution into an aqueous solution of an inorganic salt and carrying out solvent displacement so as to obtain the polymeric nanometer microsphere, wherein a volume ratio of the polymeric micelle solution to the aqueous solution of the inorganic salt is 0.01 to 1. The polymeric nanometer microsphere prepared by using the method has good stability and uniformity, narrow particle size distribution and photoresponse characteristics and the surface of the microsphere is rich in carboxyl groups, thereby facilitating application of the polymeric nanometer microsphere as a good carrier for drugs and proteins. Moreover, the method provided by the invention has the advantages of simpleness, easy practicability, good repeatability, low energy consumption, extensive applicability and easy realization of industrialization.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Anti-mite finishing agent, anti-mite finishing method for fabrics and anti-mite fabrics
The invention discloses an anti-mite finishing agent, an anti-mite finishing method for fabrics and anti-mite fabrics. The anti-mite finishing agent is composed of the following components in parts by weight: 2-6 parts of 1,4-quinoxaline 2,3-diyl trithiocarbonate, 0.5-2.5 parts of phenyl 5,6-dichloro 2-trifluoromethylbenzimidazolyl 1-carboxylic ester, 0.5-2.5 parts of 1-(4-fluorophenyl)biguanide hydrochloride, 40-60 parts of ethylene glycol and 10-20 parts of sodium dodecyl carboxymethyl imidazoline acetate. The anti-mite finishing agent provided by the invention is safe and effective; the fabrics obtained through dipping or padding after-finishing with the anti-mite finishing agent provided by the invention have excellent repelling performance to all dust mites, gamasid mites and chigger mites, and also are safe and free of irritation in long-term contact with the surface of the skin; therefore, comfortable domestic living environment is created for people.
Owner:红柳纺织科技沭阳有限公司
Asymmetric trithiocarbonate type RAFT reagent as well as preparation method and application thereof
InactiveCN104592072AThe preparation method is simple and reliableMolecular weight controllableOrganic chemistryBromineTrithiocarbonic acid
The invention belongs to the field of RAFT reagent synthesis and discloses an asymmetric trithiocarbonate type RAFT reagent as well as a preparation method and an application thereof. The preparation method comprises the following steps: by taking isobutyl mercaptan as a starting raw material, generating mercaptide under the action of alkali; generating trithiocarbonate under the action of mercaptide and carbon disulfide; and carrying out halogenation reaction on the obtained trithiocarbonate and bromide under the catalysis of alkali, and acidizing to obtain S-isobutyl-S'-propionyloxy trithiocarbonate, namely, the asymmetric trithiocarbonate type RAFT reagent. The preparation method provided by the invention is simple in synthesis route, easy to operate, simple in aftertreatment and relatively high in yield; and the prepared asymmetric trithiocarbonate type RAFT reagent is controllable in molecular weight and low in coefficient of dispersion and can be applied to the technical field of RAFT macromolecule synthesis.
Owner:GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
pH/reduction dual sensitive hydrophilic copolymer drug carrier as well as synthesis method and application thereof
InactiveCN104027813AAchieve loadingAchieve synergistic anti-tumor therapyGenetic material ingredientsPharmaceutical non-active ingredientsDisulfide bondingPolymer science
The invention relates to a pH / reduction dual sensitive hydrophilic copolymer drug carrier as well as a synthesis method and application thereof. S,S'-bis(alpha, alpha'-dimethyl-alpha''-acetic acid) trithiocarbonate is taken as a chain transfer agent, RAFT (reversible additive fragment transfer) polymerization is carried out on N-t-butyloxycarboryl propylene hydrazine, N-(3-dimethylamine propyl) methacrylamide and N-hydroxymethyl acrylamide in two steps, reaction is carried out on hydroxyl on N-hydroxymethyl acrylamide and methoxyl polyethylene glycol at an isocyanic acid esterification end, polyethylene glycol is connected by virtue of a disulfide bond, and the target product, namely pH / reduction dual sensitive hydrophilic copolymer drug carrier, is obtained after a protecting group is removed. The pH / reduction dual sensitive hydrophilic copolymer drug carrier can load adriamycin and a gene drug at the same time; meanwhile, a hydrophilic polyethylene glycol shell can protect gene substance, long circulation is realized, a disulfide bond connected with polyethylene glycol is beneficial to escape of endosome of drug-carrier, the copolymer after being loaded with a drug can be self assembled into nanomicelle in water, bioavailability of the drug can be improved, and toxic and side effects can be reduced. The copolymer synthesis method provided by the invention has the advantages that molecular weight of each segment and quantity of polyethylene glycol segments can be flexibly adjusted and reaction conditions are mild.
Owner:XI AN JIAOTONG UNIV
Preparation of 248 nm deep ultraviolet photoresist film forming resin based on RAFT polymerization method
ActiveCN105237669AImprove light transparencyImprove adhesionPhotosensitive materials for photomechanical apparatusSodium methoxide2-methylpropanoic acid
The present invention discloses preparation of a 248 nm deep ultraviolet photoresist film forming resin based on a RAFT polymerization method, and belongs to the field of deep ultraviolet photoresists. According to the photoresist film forming resin, mainly 2-(dodecyl trithiocarbonate-yl)-2-methylpropanoic acid is adopted as a RAFT reagent, 4-acetoxy styrene, styrene, tert-butyl acrylate and 2-methyl-2-methacrylic acid adamantine ester are adopted as copolymerization monomers, 1-methoxy-2-propyl acetate is adopted as a reaction solvent to carry out solution polymerization under the condition of a free radical initiator so as to synthesize a low molecular weight distribution copolymer, a certain amount of sodium methoxide and methanol are added to carry out alcoholysis so as to obtain the copolymer having high transparency at 248 nm, and the copolymer is finally applied in the 248 nm photoresist. According to the present invention, the preparation is simple, the reaction conditions are mild, the molecular weight distribution of the obtained copolymer is narrow, the molecular weight can be well controlled, and the resin is suitable for 248 nm deep ultraviolet exposure.
Owner:SUZHOU RUIHONG ELECTRONIC CHEM CO LTD +1
Method for preserving wood and preserved wood obtained in accordance with the method
InactiveUS6652986B2Reduce leachingGood effectLiquid surface applicatorsDomestic articlesZinc compoundsPreservative
A method for preserving wood that includes impregnating the wood with a wood preservative agent based on one or more compounds of at least one metal of the 1<st >and / or 2<nd >subgroups of the periodic system and fixing the metal(s) for purposes of reducing the danger of leaching. The wood is (i) impregnated with a preservative containing a water-soluble zinc compound or (ii) wood that has already been impregnated with a zinc-free preservative or one that contains at least one metal compound of the 1<st >and / or 2<nd >subgroups is impregnated with a second preservative that contains at least one water-soluble zinc compound, and wood impregnated in accordance with (i) or (ii) is impregnated with an aqueous solution of a salt of trimercapto-s-triazine (TMT), dithiocarbamate or trithiocarbonate.
Owner:EVONIK DEGUSSA GMBH
Highly washable and friction-resistant ink for cotton fabrics and preparation method thereof
The invention discloses highly washable and friction-resistant ink for cotton fabrics. The ink is composed of the following components in parts by weight: 3-5 parts of pigments, 2.5-6.5 parts of macromolecular trisulfide carbonate compounds, 0.8-1.0 part of lauryl sodium sulfate, 0.8-1.0 part of n-hexadecane, 15-18 parts of soft monomers, 2-5 parts of hard monomers, 0.03-0.05 part of a water-soluble initiator and 65-80 parts of deionized water. Compared with the traditional non-structured or non-block structure type adhesive film, the block 'core-shell' structure coated ink designed in the invention has excellent mechanical property after film forming, and an RAFT living polymerization technology is adopted when a basic molecular chain structure of the adhesive film is designed, so that each macromolecular chain is directionally and quantitatively grafted with active groups that can carry out characteristic reactions with the cotton fabrics, binding force between the adhesive layer ofthe ink and fibers of the cotton fabrics is greatly enhanced on a molecular level, and macroscopic performances such as washable property and fastness to rubbing of the ink are improved.
Owner:HANGZHOU HIWETECH CHEM TECH CO LTD
RAFT (reversible addition fragmentation chain transfer) preparation method of polylysine derivative
InactiveCN102775530AGood biocompatibilityGenetic material ingredientsPharmaceutical non-active ingredients(Hydroxyethyl)methacrylateBiocompatibility Testing
The invention provides an RAFT (reversible addition fragmentation chain transfer) preparation method of polylysine derivative, belonging to the technical field of functional material. The preparation method comprises the following steps of: taking hydroxyethyl methacrylate (HEMA) and lysine (L-lysine) as raw materials, taking trithiocarbonate as a chain transfer agent, sequentially adopting a reversible addition fragmentation chain transfer (RAFT) free radical polymerization method to obtain PHEMA homopolymer with different chain segment lengths, wherein the molecular weight of the PHEMA homopolymer is controllable, and obtaining PHEM-co-PHEMA-Boc-L-lysine copolymer by an esterification. The preparation method is simple, the prepared PHEM-co-PHEMA-L-lysine copolymer has biocompatibility, the composite formed by the electrostatic interaction between the PHEM-co-PHEMA-L-lysine copolymer and the plasmid DNA (pDNA) can be widely applicable to the fields such as the drug slow-release system, the gene therapy and the like.
Owner:JIANGNAN UNIV
Surfactantless synthesis of amphiphilic cationic block copolymers
Owner:THE GOODYEAR TIRE & RUBBER CO
Preparation method and photocatalytic hydrogen production application of CdS-PAN/graphene composite nano fiber
InactiveCN108927222AInhibition of agglomerationLarge specific surface areaOrganic-compounds/hydrides/coordination-complexes catalystsHydrogen productionFiberPotassium persulfate
The invention relates to a preparation method of a CdS-PAN / graphene composite nano fiber. The preparation method comprises following steps: at first, preparing S-n-propyl-S'-(alpha-methyl-alpha'-acetic acid)-trithiocarbonate (PTTC) and CdS-PTTC; then taking acetonitrile as monomers and potassium persulfate as an initiator to carry out reversible addition-fragmentation chain transfer polymerizationreactions to prepare CdS-PAN; and finally carrying out thermally induced phase separation to prepare the CdS-PAN / graphene composite nano fiber with a diameter of 110 to 300 nm. The preparation methodcan effectively inhibit the agglomeration of CdS nano particles. The nano fiber has a large specific surface area, and the photocatalytic activity of CdS can be effectively exerted. The CdS-PAN / graphene composite nano fiber has a high hydrogen production speed.
Owner:晋江瑞碧科技有限公司 +1
Preparation method and application of oxidized graphene based cadmium ion imprinted polymer
InactiveCN105080512ALarge adsorption capacityHigh selectivityOther chemical processesWater contaminantsActive agentSurface-active agents
The invention relates to a preparation method and application of an oxidized graphene based cadmium ion imprinted polymer and belongs to the field of new technology of environment function material preparation and water treatment. The preparation method includes: taking oxidized graphene as a substrate, Cd (II) as a template, methyl methacrylate (MMA) as monomer, cetyl trimethyl ammonium bromide (CTAB) as surfactant, azodiisobutyronitrile (AIBN) as initiator and S,S'-di(alpha, alpha'-dimethyl-alpha''-aceto) trithiocarbonate (BDAT) as RAFT auxiliary; performing reversible addition-fragmentation chain transfer (RAFT) polymerization in microemulsion to prepare a cadmium ion imprinted polymer composite material adsorbent taking oxidized graphene as the substrate. Performance in adsorbing Cd (II) is studied. The adsorbent has high selectivity to Cd (II) and large in adsorption capacity; the polymerization process can be controlled by controlling reactant ratio, and the preparation method is simple in operation and has wide application prospect in the environment field of sewage treatment.
Owner:JIANGSU UNIV
Preparation method for macromolecular adsorbent precursor diblock copolymer
The invention relates to a preparation method for a macromolecular adsorbent precursor diblock copolymer. A macromolecular chain transfer agent PMA is compounded according to a RAFT polymerizing method which comprises the following steps: taking methyl acrylate as a first monomer, trithiocarbonate as a chain transfer agent, azodiisobutyronitrile as an initiator and 1,4-dioxane or N,N-dimethyl formamide as a solvent, thereby acquiring yellow viscous liquid polymethyl acrylate with carboxyl at one end and trithio sulfatide at the other end, and then taking N-isopropyl acrylamide as a second monomer for compounding polymethyl acrylate as the macromolecular chain transfer agent, thereby acquiring a diblock copolymer PMA-b-PNIPAM. According to the invention, RAFT polymerization is utilized to compound hydrophilic PMA as the chain transfer agent for the next stage reaction by using trithio ester with higher chain transfer constant as an active / controllable polymerized chain transfer agent. The diblock copolymer PMA-b-PNIPAM at different block ratio is compounded in the manner of changing the design for different degrees of polymerization.
Owner:TIANJIN UNIV
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