175 results about "Trithiocarbonic acid" patented technology

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.

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.

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.

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.

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.

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.

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%.

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.

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.

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.

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.

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.

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.