48results about How to "The polymerization process is controllable" patented technology

The invention discloses a novel biological pollution-resistant polyamide reverse osmosis composite membrane and a preparation method thereof. The preparation method comprises carrying out graft modification on a polyamide reverse osmosis membrane through atom transfer radical polymerization (ATRP), carrying out sterilization particle loading to obtain a reverse osmosis composite membrane with bioattachment resistance and antibacterial properties. The reverse osmosis composite membrane polymerization process is carried out at the room temperature and has high controllability. The reverse osmosis composite membrane can be conveniently and fast prepared, has stable performances, effectively improves use efficiency and a use life and reduces a seawater desalination cost.

The invention relates to an acrylics/ SiO2 nano-composite tanning agent. The nano-composite tanning agent appears to be light yellow or yellow semitransparent ropy liquid, the mass concentration is 20 to 35%, the viscosity is 500 to 1000MPa.s, the pH value is 5 to 8, and the storage stable period is over 12 months. With only 2% (relative to the leather weight) chromium powder, the nano-composite tanning agent can thicken the leather by 124.5%, the shrinkage temperature reaches to 95 DEG C.; compared with a chrome tanned leather, a leather tanned by the nano-composite tanning agent has a tensile strength, peeling strength and elongation at break improved by 51.8%, 8.2% and 13.3% respectively, has no obvious stratification or sedimentation during over 12 months of storage period. Water is used as solvent when prepared, which is low-cost and pollution-free; the preparing technology is simple, the reaction is mild, the polymerization process is easy to control, so that the nano-composite tanning agent is easy to realize industrial production, the synthesized material is inexpensive and easy to obtain as well.

The invention discloses a long carbon-chain semi-aromatic polyamide and preparation method of the same. The long carbon-chain semi-aromatic polyamide has good heat resistance, rigidity at high temperature, chemical resistance and size stability, and low water absorption. The synthetic method of the invention comprises: first, adding dried diamine monomer, 11-aminoundecanoic acid, and terephthalic acid into a stirred polymerization reactor according to a certain mol ratio, after vacuum-pumping, feeding in inert gas, heating the reactor hermetically to 120-170 DEG C, and maintaining the temperature and the condition of self pressure for the reactants for 0.5-24 hours before venting to normal pressure; and then reheating to 300-350 DEG C, and keeping vacuum-pumping after reaching the constant temperature. The polyamide of the invention is simple in preparation technology, controllable in polymerization process, and can replace steels by being applied to the fields such as automobiles, machinery, and electronic and electrical equipment.

The invention relates to a method for synthesizing polyaspartic acid by maleic anhydride and ammonia gas. The method comprises the following steps: performing substitution reaction of molten maleic anhydride and ammonia gas in a closed reactor and absorbing the residual gas after the completion of the substitution reaction; adding sodium hydrate solution into the reacted maleic anhydride and ammonia gas to perform neutrallzation reaction, so as to obtain a mixture of maleamic acid sodium and maleamic acid ammonium; directly heating the product in the closed reactor and performing condensation polymerization by stirring; steaming and drying the moisture after the completion of the condensation polymerization, so as to obtain the polysuccinimide solid; adding water in another reaction kettle and starting stirring; then adding the polysuccinimide solid into the reaction kettle and slowly adding sodium hydrate solution and heating to perform hydrolysis reaction, so as to obtain the polyaspartic acid solution. According to the method for synthesizing polyaspartic acid by maleic anhydride and ammonia gas, the production process is simplified and the polyaspartic acid prepared according to the method has a weight-average molecular weight of 2000-15000 and a molecular weight distribution index of 1.5-1.65, so that molecular weight requirements of various application domains are met and environment-friendly production process is realized.

The invention discloses a function prepolymer and a preparation method and application thereof. The function prepolymer is a butyl acrylate polymer and prepared from a monomer, modified matter and an emulsifying agent through emulsion polymerization. A synthetic thickener, liquid disperse dye and the function prepolymer are mixed with water and evenly stirred to obtain printing paste; printing and drying of a polyester fabric are achieved through the obtained printing paste on a rotary screen printing machine or a mobile screen printing machine, then high-temperature processing is carried out on a tentering heat setting machine, and a printed polyester fabric is obtained. According to the technical scheme, the printing process is short, the hand feeling of the fabric is soft, postprocessing is not needed, a large amount of water and energy are saved, almost no wastewater is drained, processing equipment is conventional, and the printing processing technology is environmentally friendly.

The invention discloses a preparation method of polyester-polycarbonate-polyester multi-block copolymer and belongs to the technical field of high molecular materials. The preparation method comprises the steps that a multi-block polymerization is completed through a 'one-pot method', in another word, a Bronsted acid catalyst sequentially catalyzes cyclic lactone and cyclic carbonate for achieving ring opening polymerization, then a preset amount of tertiary amine R<3>N which is excessive relative to acid is input, wherein conjugate acid R<3>N<+>-H<delta+> formed by alkali which is equal to acid in a system in proton number serves as a hydrogen bond donor, spare alkali serves as a hydrogen bond receptor, ring opening polymerization of lactide which is finally input is catalyzed in a bifunctional mode, and the polyester-polycarbonate-polyester triple-block copolymer is finally synthesized. The preparation method has the advantages that the catalyst is simple in structure and easy to obtain, the reaction is mild and high in efficiency, the 'one-pot method' is easy and convenient to operate, the whole polymerization reaction exhibits active characteristics, the polymer molecular weight is controllable, and molecular weight distribution is narrow.

The invention relates to a synthesizing method of cross-linked zinc polyacrylic acid and a representative using method of the cross-linked zinc polyacrylic acid, in particular to a synthesizing method of reticular cross-linked zinc polyacrylic acid and a using method of the cross-linked zinc polyacrylic acid in batteries. According to the synthesizing method, acrylic acid serves as a monomer, zinc oxide serves as a neutralizing agent, and synthesizing of the reticular cross-linked zinc polyacrylic acid is achieved in an aqueous system under the action of a cross-linking agent and a one-component initiator. A synthesized product is used for replacing an anode active material of a nickel-zinc secondary battery, in this way, the representative using method of the cross-linked zinc polyacrylic acid is achieved, and the practicability of the cross-linked zinc polyacrylic acid in improving low-temperature power performance and self-discharge control of a nickel-zinc rechargeable battery and the like is achieved. A reference is provided for application of the cross-linked zinc polyacrylic acid in silver-zinc batteries, MnO2-zinc batteries, Edison batteries and the like. The polymerization method has the advantages of being short in process, easy to operate, high in safety, low in product cost and the like, and a basis is laid for application of the synthesized product in the fields such as non-toxic preservation of potatoes, efficient utilization of feminine sanitary towels, green mildew preventives for leather, micro-element fertilizers and accelerants.

A core-shell polymer of acrylate with high adhesive between core and shell for modifying polyvinyl chloride features that the alkyl acrylate is used as its core, methyl methylacrylate is used as its shell, and the alkyl acrylate-methyl methylacrylate is used to link core with shell.

The invention provides a reaction type dispersing agent and a preparation method for the polyacrylamide water emulsion. The method for preparing the water emulsion comprises the steps of preparing the reaction type dispersing agent; balancing the concentration of free radicals by multiple sections of composite initiating systems under the participation of a saline solution system and the dispersing agent, and performing water emulsion dispersing polymerization on acrylamide and cationic monomers. The water emulsion product can be quickly dissolved, has a high molecular weight, is high in flowability and high in stability and can be widely applied to the field of water treatment of all industries.

This invention relates to elasticity styrene - acrylate waterproof latices and its preparation method. It is polymerized by nine kind component and seed emulsion. The preparation method includes as follows steps: whip, vacuumize, whip, polymerization, thermal insulation, cooling, thermal insulation, cooling, filter, casing. This invention has low cost, stable color phase, moderate consistency, good acid and alkaline protection, and lower vitrification point. It can effectively eliminate liberation monomer, avoid enviroment pollution. This invention especially fit for cement group polymer waterproof, waterproofing work as well as impervious seal stuff.

The invention discloses a method for preparing mesoporous material through microwave-assisted loading of nanometer silver oxide. The method specifically includes the first step of preparing a solution A, the second step of preparing a solution B, the third step of carrying out primary dipping, the fourth step of carrying out deep dipping, and the fifth step of preparing the finished product. According to the method, granules containing Zn and Ag and the graphite oxide component are attached to the surface of the mesoporous material through microwave ultrasonic loading, metal ions and graphite oxide form a double-layer structure on the surface of the mesoporous material, the loss rate of graphite oxide is low, and thus cost is reduced; by the adoption of microwave-assisted loading, the method has the advantages that reaction conditions are mild, the reaction speed is high, and the yield is high; the pH value is regulated to be 5-6 with a hydrogen chloride solution, the loading capacity of metallic oxide is improved, and the dispersity of metallic oxide is good; a titanium dioxide catalyst is sprayed on the surface of the mesoporous material blow-dried with nitrogen, integration of the mesoporous material and the surface-loaded material is achieved, and the titanium dioxide catalyst is high in loading efficiency, makes the polymerization process easy to control, accelerates the reaction process and improves productivity.

The invention provides cationic polyacrylamide aqueous emulsion and a preparation method of cationic polyacrylamide aqueous emulsion. The method for preparing the aqueous emulsion comprises the steps of preparing a reaction type dispersing agent; and balancing the free radical concentration through a multistage complex initiation system under the participation of a salt liquid system and the dispersing agent, and carrying out dispersion polymerization of acrylamide and cationic monomer aqueous emulsion. The aqueous emulsion can be dissolved rapidly, has high molecular weight, good mobility and high stability, and can be widely applied to the water treatment fields of all industries.

The invention relates to thermotropic liquid crystal block polyarylate as well as preparation and application thereof. The polyarylate is shown as a general formula I. The single-component thermotropic liquid crystal block polyarylate is obtained by utilizing chemical activity difference control product combination of diphenol monomers, and has two glass transition temperatures. A high-temperature-resistant multi-shape memory material is prepared by utilizing a plurality of glass transition temperature, and is applied to the wider fields of aerospace, robots and the like.

The invention discloses a composite material of polyortho-methyl - acryloylamino -benzoic acid as luminopolymer and nano metal sulfide. The preparation method comprises: with polyortho-methyl - acryloylamino -benzoic acid as template and metal salt and sulfide as mateials, original generating nano metal oxide in liquid, and obtaining the said material. Wherein, the metal salt is selected one or more from zinc acetate, manganese chloride, copper acetate, nickel sulfate, cadmium nitrate, and silver acetate; the sulfide is selected from sodium sulfide or thioacetamide. This invention has potential application value.

The invention provides a preparation method of a degradable poly-alpha-olefin material with controllable olefin insertion rate, which comprises the following step: reacting cycloenone acetal, an alpha-diimine palladium catalyst, a nucleophilic reagent and alpha olefin under the irradiation of visible light to obtain the degradable poly-alpha-olefin material. According to the application, the cycloenone acetal and the alpha olefin are copolymerized by combining free radical ring-opening polymerization of the cycloenone acetal and coordination polymerization of the alpha olefin, and degradable units (ester bonds) are introduced into all copolymer carbon skeletons. The preparation method is mild in reaction condition, heating is not needed, and the olefin insertion rate can be adjusted in a wide range with the mass ratio of 23-71%. By means of the preparation method, the production cost can be effectively reduced, and environmental pollution caused by polyolefin is avoided.

The invention relates to a preparation method of biochar with multiple heavy metal Cd adsorption sites. The method comprises the following steps: firstly, selecting raw materials for preparing biochar, and preparing biochar at a certain cracking temperature; then immobilizing an atom transfer radical polymerization (ATRP) initiation site on the biochar by adopting a surface chemical modification method to obtain biochar rich in the ATRP initiation site on the surface; and finally, selecting a functional monomer with Cd adsorption sites, and carrying out ATRP controllable grafting to obtain the biochar with multiple heavy metal Cd adsorption sites on the surface. Compared with an existing biochar grafting method, the biochar prepared through the method has the advantages that the types and the number of heavy metal adsorption sites on the surface are large, and the types and the number of the adsorption sites can be freely regulated and controlled.

The invention relates to a hydrogen peroxide responsive polymer nano-carrier with a fluorescence ratio characteristic. The nano-carrier is of a spherical micelle structure, and is formed by self-assembling of an amphiphilic block copolymer with hydrogen peroxide responsiveness and ratiometric fluorescence imaging characteristics. The structural formula of the amphiphilic block copolymer having hydrogen peroxide responsiveness and ratiometric fluorescence imaging characteristics is as follows: R1 is a group having hydrogen peroxide responsiveness; R2 is a group with an aggregation-induced emission effect; R3 is a PEG hydrophilic chain; and R5 is a group with strong positive charges. The nano-carrier disclosed by the invention can be used for loading, transporting and program releasing of hydrophobic dye molecules and drug molecules as well as cell imaging and fluorescent molecular probes.