45results about How to "The synthesis method is stable" patented technology

The invention relates to a method for preparing a polycarboxylate superplasticizer by carrying out graft copolymerization on acrylic ester polymer and fatty acid vinyl ester. According to the method for preparing the polycarboxylate superplasticizer by carrying out graft copolymerization on the acrylic ester polymer and fatty acid vinyl ester, acrylic ester polymer and fatty acid vinyl ester are taken as main reaction raw materials, polymerization is carried out firstly, then grafting is carried out and then alcoholysis and hydrolysis are carried out to prepare the polycarboxylate superplasticizer grafted and polymerized with the acrylic polymer and fatty acid vinyl ester, namely acrylic ester is taken as a reaction monomer, polymerization is carried out under the actions of an initiating agent and a molecular weight regulating agent, then graft polymerization is carried out with the fatty acid vinyl ester to obtain a graft copolymer with the acrylic ester polymer as a main chain and polyvinyl ester fatty acid as a side chain, and finally alcoholysis and hydrolysis are carried out on the graft copolymer. The method for preparing the polycarboxylate superplasticizer by carrying out graft copolymerization on the acrylic ester polymer and fatty acid vinyl ester has the advantages that a process is simple and easy to control, cost is low, environmental protection is realized, no pollution is produced, the fatty acid vinyl ester is used for replacing the existing polycarboxylate superplasticizer, and diversification of raw materials is enriched; and the prepared superplasticizer has good cement paste fluidity and holding capability and shows good cement adaptability and concrete application property.

The invention relates to a method for synthesizing a cement dispersing agent by using a terminated functional polyethylene fatty acid ester macromonomer. The cement dispersing agent is prepared by taking fatty acid vinyl ester as a main reaction raw material through a method comprising the steps of autopolymerization, substitution, alcoholysis and copolymerization, namely, polymerizing by taking fatty acid vinyl ester as a reaction monomer under the action of an initiator and a chain transfer agent to generate a polymer; then, carrying out substitution reaction on the polymer and an unsaturated chlorinated substance to obtain a polyethylene fatty acid ester macromonomer of which the macromolecular chain terminal is a double bond; next, carrying out alcoholysis on the macromonomer to prepare a macromonomer with the double bond at the terminal and with a polyvinyl alcohol structure; and finally, carrying out copolymerization reaction on the macromonomer and a carboxylic acid micromonomer to prepare the cement dispersing agent. The method is simple and easily-controlled in process, low in cost, environment-friendly and pollution-free; and the cement dispersing agent prepared by taking fatty acid vinyl ester as the raw material has favorable net cement paste flowability and holding capacity and shows favorable cement adaptability and concrete application property.

The invention relates to a method for preparing mannose-containing derivatives capable of being used for post-polymerization modification by double-click chemistry combination. The method comprises the following steps: under the actions of propargyl bromide and acryloyl chloride respectively, preparing a compound with terminal alkyne and terminal olefin by using a Williessen ether-forming reaction; and then performing sulfydryl-alkene addition reaction on terminal olefin and sulfydryl compounds, and performing CuAAC reaction on terminal alkyne and acetyl-protected alpha-D-pyranomannose azide.Compared with the prior art, mercaptan substances with different structures are successfully combined with the alpha-D-pyranomannose azide through a mercapto-alkene addition reaction and GuAAC combined method for the first time, the mannose-containing derivative capable of being applied to post-polymerization modification is prepared, and the synthesis method is stable, efficient and high in yield. A considerable way is provided for obtaining a sugar-containing homopolymer with controllable molecular weight and narrower molecular weight distribution in the later period.

The invention relates to a method for preparing an MOF / carbon composite material under the assistance of atomic layer deposition, an obtained product and application. The preparation method comprises the steps of preparing metal oxide / carbon composite materials with different thicknesses; and preparing the MOF / carbon composite material. The MOF / carbon composite material is prepared by taking a carbon material as a substrate and combining atomic layer deposition and an organic solution and metal matching experiment. The method is simple in process, meanwhile, the number of MOFs can be accurately controlled, the defects of MOF agglomeration and different particle sizes are effectively overcome, and the method has wide application value in the fields of energy storage, electromagnetic wave absorption, heat conduction and the like.

The invention belongs to the technical fields of polymer materials technologies and harmful gas treatment, and particularly relates to an aminooxy structure-containing polymer and a formaldehyde adsorbent including the polymer, and preparation methods thereof. Reversible addition-fragmentation chain transfer (RAFT) polymerization or atom transfer radical polymerization (ATRP) is used to obtain thepolymer containing a large amount of aminooxy groups, the polymer and a two-dimensional carrier material are commonly loaded on porous melamine foam or polyurethane foam to prepare an aerogel material, and the aerogel material is a three-dimensional material capable of efficiently adsorbing gaseous formaldehyde, that is, the formaldehyde adsorbent. The formaldehyde adsorbent in the invention realizes reversible chemical adsorption of the formaldehyde gas at normal temperature under normal pressure in the absence of a catalyst, combines the high specific surface area of the carrier and the three-dimensional porous structure of the foam, and can be used for specifically and efficiently adsorbing the gaseous formaldehyde; and the formaldehyde can be desorbed under the action of dilute hydrochloric acid, so the formaldehyde adsorbent can be repeatedly used.

The invention discloses the preparation of a cyclo-metalated iridium-azo complex and an application of the cyclo-metalated iridium-azo complex to the detection of sulfur dioxide. The complex provided by the invention can react with the sulfur dioxide specifically to produce the fluorescent response, has strong cell membrane penetration capacity and low cytotoxicity, can be used for identifying the sulfur dioxide in the cells and has a great application potential in the aspect of real-time and quick detection of the sulfur dioxide.

The invention relates to a preparation method and application of a calcium hydroxide-loaded graphene aerogel composite material, belongs to the technical field of graphene aerogel, and can solve the problems of limited absorption amount and complex production process of an existing industrial harmful gas treatment and absorption method, and the preparation method adopts a step-by-step synthesis method and comprises the following steps: firstly, synthesizing calcium hydroxide particles by utilizing a precipitation method; and synthesizing graphene oxide by using an electrolytic oxidation method. In the next step, calcium hydroxide and graphene oxide are subjected to a polymerization reaction through a hydrothermal synthesis method, and finally the graphene aerogel composite material loadedwith calcium hydroxide is obtained. The composite material can be used in the field of chemical adsorption removal of acidic industrial harmful gases such as SO2, H2S, Cl2 and the like, and can also be used in the field of adsorption of VOCs gases such as benzene and the like.

The invention discloses a preparation method of a cation-modified molybdenum oxide or tungsten oxide nanowire with a large specific surface area. The preparation method comprises the following steps of: dissolving inorganic cations and a molybdenum source or tungsten source in deionized water, stirring solution, simultaneously regulating the pH value of the solution to be above an isoelectric point of molybdenum oxide or tungsten oxide by using protonic acid, then transferring into a self-pressure reaction kettle, reacting for 1-30 hours at a constant temperature of 100-240 DEG C after sealing, separating out solid products after the reaction is ended, washing, and drying to obtain the cation-modified molybdenum oxide or tungsten oxide nanowire with the large specific surface area. The cation-modified molybdenum oxide or tungsten oxide nanowire has the characteristics that the diameter is small, the distribution is narrow (3-10nm), the length-diameter ratio is more than 250, the porouseffect is achieved, the specific surface area is not smaller than 200m<2> / g, the degree of crystallinity is lower and the surface hydroxyl groups are rich and the like.

The invention discloses a preparation method of a cation-modified molybdenum oxide or tungsten oxide nanowire with a large specific surface area. The preparation method comprises the following steps of: dissolving inorganic cations and a molybdenum source or tungsten source in deionized water, stirring solution, simultaneously regulating the pH value of the solution to be above an isoelectric point of molybdenum oxide or tungsten oxide by using protonic acid, then transferring into a self-pressure reaction kettle, reacting for 1-30 hours at a constant temperature of 100-240 DEG C after sealing, separating out solid products after the reaction is ended, washing, and drying to obtain the cation-modified molybdenum oxide or tungsten oxide nanowire with the large specific surface area. The cation-modified molybdenum oxide or tungsten oxide nanowire has the characteristics that the diameter is small, the distribution is narrow (3-10nm), the length-diameter ratio is more than 250, the porouseffect is achieved, the specific surface area is not smaller than 200m<2> / g, the degree of crystallinity is lower and the surface hydroxyl groups are rich and the like.

The invention discloses a norbornene derivative based homopolymer containing heterogeneous sugar units and a synthetic method of the homopolymer. With the adoption of a gradient organic synthesis method, an acetyl protected norbornene monomer NB-Man-Glu-OAc containing heterogeneous sugars is prepared by combining with a copper catalyzed azido-terminal alkyne [3+2] cycloaddition reaction (CuAAC), then a linear sugar-containing homopolymer with controllable molecular weight and narrower molecular weight distribution is obtained with ROMP (ring-opening metathesis polymerization), and the final homopolymer PNB-Man-Glu-OH containing the heterogeneous sugar units is obtained by deprotection. One simple and efficient path is provided for synthesis of sugar-containing polymers which contain the heterogeneous sugar units, and synthesis of the sugar-containing polymers has great guiding significance in studying special recognition mechanism for the sugar units and lectin and developing functional sugar-containing polymers with special biological diagnosis functions.

The invention relates to a method for synthesizing a cement dispersing agent by using a terminated functional polyethylene fatty acid ester macromonomer. The cement dispersing agent is prepared by taking fatty acid vinyl ester as a main reaction raw material through a method comprising the steps of autopolymerization, substitution, alcoholysis and copolymerization, namely, polymerizing by taking fatty acid vinyl ester as a reaction monomer under the action of an initiator and a chain transfer agent to generate a polymer; then, carrying out substitution reaction on the polymer and an unsaturated chlorinated substance to obtain a polyethylene fatty acid ester macromonomer of which the macromolecular chain terminal is a double bond; next, carrying out alcoholysis on the macromonomer to prepare a macromonomer with the double bond at the terminal and with a polyvinyl alcohol structure; and finally, carrying out copolymerization reaction on the macromonomer and a carboxylic acid micromonomer to prepare the cement dispersing agent. The method is simple and easily-controlled in process, low in cost, environment-friendly and pollution-free; and the cement dispersing agent prepared by taking fatty acid vinyl ester as the raw material has favorable net cement paste flowability and holding capacity and shows favorable cement adaptability and concrete application property.

The invention discloses a method for preparing a sugar-containing polymer by combining affinic ROMP polymerization and mercapto-ene addition reaction. The present invention utilizes the gradient organic synthesis method, combined with the thiol-ene Michael Addition reaction (Thiol-ene Michael Addition), to prepare norbornene derivatives containing non-protecting groups of heterosaccharide monomers, followed by ring-opening metathesis polymerization ( ROMP) to obtain sugar-containing homopolymers with controlled molecular weight and narrow molecular weight distribution width. Based on the advantages of mercapto-ene addition reaction, the present invention provides a feasible platform and approach for preparing heterogeneous sugar-containing monomers with ordered side chain structures; The specific recognition mechanism of units and lectins and the development of functional sugar-containing polymers with special biodiagnostic functions have important guiding significance.

The invention discloses the preparation of a cyclo-metalated iridium-azo complex and an application of the cyclo-metalated iridium-azo complex to the detection of physiological thiol. The complex provided by the invention can react with the physiological thiol specifically to produce the fluorescent response, has strong cell membrane penetration capacity and low cytotoxicity, can be used for identifying the thiol in the cells and has a great application potential in the aspect of real-time and quick detection of the physiological thiol.

The invention discloses the preparation of a cyclo-metalated iridium-azo complex and an application of the cyclo-metalated iridium-azo complex to the detection of physiological thiol. The complex provided by the invention can react with the physiological thiol specifically to produce the fluorescent response, has strong cell membrane penetration capacity and low cytotoxicity, can be used for identifying the thiol in the cells and has a great application potential in the aspect of real-time and quick detection of the physiological thiol.

The invention discloses a europium-based coordination polymer nanosphere and a preparation method and application thereof. The preparation method of the europium-based coordination polymer nanosphere comprises the following steps of adding EuCl3.6H2O, H2BDC and polyvinylpyrrolidone to mixed solvent formed by mixing N, N-dimethylformamide and absolute ethyl alcohol, and conducting stirring till the materials are fully dissolved; then, transferring a mixed solution into a reaction still provided with a polytetrafluoroethylene inner container, and putting the reaction still in a drying oven at the temperature of 150 DEG C to leave the reaction still standing still for 12 hours; and then sequentially conducting cooling, centrifugalization, washing and vacuum drying, so that the europium-based coordination polymer nanospheres are obtained. A to-be-detected water body is added to fluorescent material suspension liquid prepared from the europium-based coordination polymer nanospheres; after being mixed uniformly, the materials are left standing still; and then a fluorescence spectrophotometer is adopted for detection, and the content of phosphate in the to-be-detected water body can be obtained. The europium-based coordination polymer nanosphere is stable in performance, not prone to photobleaching, good in water solubility, capable of effectively detecting the content of the phosphate in the water body, simple in synthesis method and low in raw material cost.

The invention relates to a method for preparing a mannose-containing derivative that can be used for post-polymerization modification by combining double click chemistry. First, under the action of propargyl bromide and acryloyl chloride, respectively, a Williamson-forming ether is used to prepare a mannose-containing derivative. Compounds with terminal alkynes and terminal alkenes. Then, the terminal alkene and the mercapto compound undergo a mercapto-ene addition reaction, and the terminal alkyne and the acetyl-protected α-D-mannopyranosyl azide undergo a CuAAC reaction. Compared with the prior art, the present invention successfully combines thiol substances of different structures with α-D-mannopyranosyl azide through the combined method of mercapto-ene addition reaction and GuAAC to prepare A mannose-containing derivative that can be used for post-polymerization modification is developed. The synthesis method is stable and efficient, and provides a considerable way for obtaining sugar-containing homopolymers with controllable molecular weight and narrow molecular weight distribution in the later stage.

The invention relates to the technical field of synthesis of amino acid-containing saccharide derivatives, in particular to a cysteine-containing saccharide derivative and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a compound with terminal alkyne and terminal olefin, carrying out Thiol-ene reaction on the terminal olefin and N-acetylcysteine methyl ester, and carrying out CuAAC reaction on the terminal alkyne and acetyl-protected alpha-D-mannopyranose azide to prepare the cysteine-containing saccharide derivative. Compared with the prior art, cysteine and alpha-D-mannopyranosyl azide are successfully combined through a click chemical reaction for the first time, and the amino acid-containing saccharide monomer which can be used for RAFT polymerization and post-polymerization modification is prepared. And a considerable way is provided for obtaining the homopolymer with controllable molecular weight and narrower distribution in the later stage.

The invention provides a synthesis method of o-cresol formaldehyde epoxy resin, which comprises steps that: at 0.01-0.1MPa vacuum degree, the o-cresol formaldehyde epoxy resin is dissolved by epichlorohydrin and a catalyzer is added for circumfluence and etherification reaction; at the 0.02-0.1MPa vacuum degree, alkali is added for catalyzing cyclization reaction; the epichlorohydrin is recycled and processed after refining reaction. The o-cresol formaldehyde epoxy resin obtained by the synthesis method of the invention can reach a scheduled softening point and has high epoxy value and low content of easily saponifiable chlorine.