14 results about "Trithiocarbonic acid" patented technology

The invention provides a polymer compatilizer and application thereof, and relates to the technical field of organic materials. Specifically, a molecular chain of the polymer compatilizer comprises a polyolefin chain segment, a reversible covalent bond group and an active functional group which are connected in sequence; wherein the reversible covalent bond group comprises at least one of a cycloaddition reaction system, a disulfide bond system, a borate bond system, an acylhydrazone bond system, an oxime bond system, a trithiocarbonate bond system and a tetrazole-olefin light click chemical system. According to the compatilizer structure, a dynamic covalent cross-linked network can be constructed at the interface of the composite material, and the interface is endowed with an intelligent response characteristic through fracture and recombination of reversible covalent bonds, so that the interface bonding strength of the composite material is far higher than that of a traditional system; the technical problems that in the material service process in a traditional system, due to permanent covalent bonding, an interface is prone to being damaged and cannot be reversibly repaired are effectively solved.

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

This invention discloses a method for preparing a low-residue styrene-maleic anhydride copolymer resin, belonging to the field of polymer synthesis technology. The preparation method includes: dissolving styrene monomer, maleic anhydride monomer, and a bifunctional trithiocarbonate RAFT reagent in an organic solvent, and then performing RAFT controlled free radical polymerization via thermal or photoinitiation. The R group of the RAFT reagent contains a 4-dimethylaminopyridine structure, which directionally enriches maleic anhydride monomer around the polymerization active center through dynamic hydrogen bonding-ion pairing, forcibly forming an alternating copolymer structure; its Z group contains a substituted cyclohexyl peroxyketal structure, which can decompose in situ under thermal or photo-triggered conditions to generate initiating free radicals without the need for an external initiator. This method achieves precise control of the copolymer's molecular weight and sequence structure, resulting in a resin with low free reagent and monomer residues, controllable number-average molecular weight, and a small molecular weight distribution coefficient.

This invention discloses a copper ion scavenging agent suitable for a wide pH range, its preparation method, and its application. The scavenging agent comprises the following components by mass: 10-30 parts trithiocarbonate, 5-20 parts N,N-dimethylaminodithiocarbamate, and 1-5 parts sodium citrate. The preparation method is as follows: (1) Add water to a sodium citrate solution and stir to prepare a buffer solution A; (2) Add trithiocarbonate and N,N-dimethylaminodithiocarbamate to buffer solution A, stir until completely dissolved, and filter to obtain the final product. This invention has the advantages of a wider pH range, copper removal effect that varies with water quality, stable copper removal effect, fast reaction speed, and rapid floc settling. After treatment, the concentration of each copper ion is less than 0.1 mg / L, the iron content is less than 0.0001%, and the lead content is less than 0.0001%, meeting the environmental emission requirements.

The present application relates to the technical field of sulfide lead-zinc ore dressing, and discloses an alkali-free ore dressing method for sulfide lead-zinc ore. The method comprises the following steps: grinding to obtain ore slurry; performing lead flotation on the ore slurry to obtain lead concentrate and lead tailings; adding pyrite depressant, zinc activator and zinc flotation collector into the lead tailings slurry to perform zinc flotation, and obtaining zinc concentrate and final tailings; wherein, in the process of lead flotation, the added lead flotation depressant is a mixture of lignosulfonate and zinc sulfate; in the process of zinc flotation, the added pyrite depressant is composed of trithiocarbonate containing a hydrophilic group and a sulfur-containing inorganic salt. The present application can realize alkali-free flotation of sulfide lead-zinc ore, avoid the disadvantages of high-alkali lime process, and improve the lead-zinc separation efficiency.

The invention relates to the technical field of beryllium adsorbents, and discloses a preparation method of a sulfo-functionalized galactose beryllium adsorbent, which comprises the following steps: weighing a double-bond-containing galactose monomer, 2-(n-butyl trithiocarbonate) propionic acid (CTA) and VA-044, respectively dissolving with a solvent, reacting in a nitrogen environment, dialyzing after the reaction, and freeze-drying to obtain P0; the preparation method comprises the following steps: respectively dissolving chlorosulfonic acid and a galactose-containing high-molecular polymer P0 by using a solvent, slowly dropwise adding a sulfonating reagent into a P0 solution to obtain a mixed solution, carrying out a stirring reaction, adjusting the pH value of the solution after the reaction is completed, and carrying out dialysis and freeze-drying to obtain SO3-P0. The preparation method of the sulfonic group functionalized galactose beryllium adsorbent is simple to operate, low in cost, high in synthesis efficiency and suitable for industrial production. The sulfonic acid group in the adsorbent prepared by the method can enhance the adsorption effect of the adsorbent on beryllium ions through ion exchange. According to the method, the adsorption capacity reaches 34.98 mg / g under low-concentration beryllium-containing leachate, the beryllium ion concentration in the leachate after adsorption is smaller than 5 ppb, and the beryllium removal rate reaches 90% or above.

This composition for forming a retardation film contains a polymer (P) having a terminal group derived from a polymerization control agent (A) containing a structure selected from the group consisting of trithiocarbonate, dithiocarbamate, dithiobenzoate, and dithiocarbonate. The polymer (P) has a structural unit (X) derived from a monomeric compound having a photosensitive group (p) and a polymerizable unsaturated bond group.

This invention discloses a reverse demulsifier for oilfield produced fluid treatment, prepared using the following steps: N-(3-dimethylaminopropyl)methacrylamide, methyl chloroacetate, and the polymerization inhibitor p-hydroxyanisole are added to a solvent and reacted at a constant temperature for 10 hours. After cooling, dimethylaminopropylamine is added dropwise and reacted at room temperature for 1 hour. Then, p-hydroxyanisole is added and the reaction is heated for 4 hours. Next, etherifying agent Quat-188 with an effective content of 65% is added and the reaction is heated for 10 hours. After removing the solvent, a high cationic density monomer is obtained. Then, the high cationic density monomer and 2-(dodecyltrithiocarbonate)-2-methylpropionic acid are dissolved in anhydrous ethanol and an initiator and reacted at a constant temperature and with stirring for 3 hours. Then, acrylate monomers are added, nitrogen is purged to remove oxygen, an initiator is added, and the reaction is heated for 3 hours to obtain the product. The reverse demulsifier for oilfield produced fluid treatment proposed in this invention has a stronger ability to neutralize the negative charge of oil droplets and can be applied to the demulsification treatment of high-concentration oily wastewater under more severe conditions.

The invention discloses a preparation method of a gradient copolymer. [S = C (S-Z) S-R] trithiocarbonate is selected as a chain transfer agent, and the gradient copolymer is synthesized through an active polymerization reaction.

The invention provides a polymer interface material and application, and relates to the technical field of materials. Specifically, the polymer interface material comprises a skeleton and a grafting group connected to the skeleton through a dynamic covalent bond, the dynamic covalent bond comprises at least one of an ester bond, an imine bond, a trithiocarbonate bond, an alkoxyamine bond, a disulfide bond and a borate bond. According to the material, a dynamic covalent bond which is subjected to a bond exchange reaction or a homocracking / recombination reaction under specific stimulation is introduced into a molecular network, and the dynamic network realizes topological structure reconstruction through bond exchange or recombination, so that high interface strength, high toughness and non-performance vacuum self-repairing capability are synergistically realized, and the material has a good application prospect.

The invention belongs to the field of RAFT reagent synthesis, and particularly relates to a preparation method of a reversible addition fragmentation chain transfer reagent. Comprising the following steps: by taking dodecyl mercaptan as a starting raw material, generating thiolate under the action of alkali; and reacting the obtained thiolate with carbon disulfide (CS2) to generate trithiocarbonate. And reacting the obtained trithiocarbonate with trichloromethane and acetone under the catalysis of alkali, and finally acidifying to obtain 2-[dodecyl sulfenyl (thiocarbonyl) sulfenyl]-2-methyl propionic acid, namely the RAFT reagent. Tetrabutylammonium bromide is specifically selected as a phase transfer catalyst, and the catalyst system provided by the invention can realize higher product yield.

This application relates to the technical field of mortar admixtures, and in particular to a high-efficiency thixotropic lubricant for gypsum plaster mortar and its preparation method, comprising a copolymer with thioether bond-terminated ends; wherein the raw materials of the copolymer have the following molar ratios: a macrocyclic host monomer containing polymerizable double bonds and a sterically hindered hydrophobic guest monomer at 1.05~1.2:1, a trithiocarbonate chain transfer agent and a water-soluble initiator at 5~8:1, and an end-capping agent containing electron-deficient double bonds and a chain transfer agent at 1.2~2.0:1; the copolymer is prepared by isothermal pre-inclusion of the macrocyclic host monomer and the hydrophobic guest monomer in an aqueous phase at 40~50°C, followed by polymerization at 40~50°C with the addition of a water-soluble vinyl main chain monomer, a chain transfer agent and an initiator, and then desulfurization and aminolysis with an aminolytic agent containing primary amine groups, followed by in-situ Michael addition with the end-capping agent. This application can achieve long-lasting thixotropic lubrication with resistance to alkali and shear.

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

The application discloses a method for preparing a RAFT reagent by reducing and decomposing sodium trifluoromethylsulfinic acid. The method uses sodium trifluoromethylsulfinic acid and bromide and thiourea as raw materials, uses triphenyl phosphine and diphenyl chlorophosphine as a reducing agent, uses sodium carbonate as an alkali, and uses acetonitrile as a solvent. Sodium trifluoromethylsulfinic acid is reacted with bromide and thiourea by reducing and decomposing to obtain a trithiocarbonate compound, and the trithiocarbonate compound is a commonly used RAFT reagent. The raw material used in the method is cheap and easy to obtain, the reactants are all non-irritating and low-toxicity and safe reagents, the reaction condition is mild, the substrate range is wide, and the method is suitable for large-scale production.