181results about How to "The polymerization reaction is stable" patented technology

The invention discloses UV-curable elastic polyurethane acrylate emulsion and a synthesis method thereof. The synthesis method of the UV-curable elastic polyurethane acrylate emulsion comprises the following steps: carrying out reaction on polyester glycol or polyether glycol, carboxylic acid-containing glycol and diisocyanate to generate a prepolymer, adding an optimized micromolecular chain extender for carrying out chain extension, then adding hydroxy-containing acrylate for carrying out blocking reaction, diluting by virtue of an organic solvent, neutralizing and salifying by adopting organic amine, finally adding deionized water for carrying out hydration, and adding a photoinitiator to obtain the UV-curable elastic polyurethane acrylate emulsion. The UV-curable elastic polyurethane acrylate emulsion is polyurethane blocked by acrylate, and a molecular chain of the UV-curable elastic polyurethane acrylate emulsion is provided with hydrophilic negative ions and double bonds, so that the UV-curable elastic polyurethane acrylate emulsion has self-emulsifying property and photocuring activity; and a cured film formed by carrying out photocuring on the synthesized elastic polyurethane acrylate emulsion has excellent mechanical properties, tensile strength is 21MPa, and elongation is 350%, so that the elastic polyurethane acrylate emulsion can serve as matrix resin of water-based ink and waterborne UV-curable elastic paint.

The invention relates to a preparation method and product of a modified polyurethane flexible high-molecular emulsion containing side long chain alkyl. The preparation method comprises the following steps: preparing raw materials including a polymeric monomer, a modifying agent, an auxiliary agent and water; performing dehydration pretreatment on polyether triol and polyether glycol; performing prepolymerization; performing chain extension; sealing ends; and emulsifying to prepare a modified polyurethane flexible high-molecular emulsion product containing side long chain alkyl. According to the modified polyurethane flexible high-molecular emulsion disclosed by the invention, polysiloxane chain links and polyolefin chain links are embedded into a skeleton structure of the modified polyurethane flexible high-molecular emulsion, and polyurethane high molecules are modified by using long chain alkyl. The obtained modified polyurethane flexible high-molecular emulsion containing side long chain alkyl has a certain density of long chain crosslinking and side long chain alkyl, has excellent stability, can be applied to dry coating processing of various substrate coatings and artificial leathers, and ensures that significant water-repellent and anti-fouling abilities, extremely excellent extension performance, excellent low-temperature high flexibility and anti-bending performance of product coating films can be achieved; and the product is safe and environment-friendly, and is convenient to use.

The invention relates to an initiator composition used for synthesizing polyacrylamide capable of displacing oil, which mainly solves the problems of low polyacrylamide molecular weight, poor heat resistance and salt resistance performances and difficult satisfaction for technical requirement of tertiary oil extraction. The initiator composition used for synthesizing polyacrylamide capable of displacing oil comprises the following ingredients by weight percentage: (a) 0.5-20% of persulfate; (b) 0.1-40% of sulfite or acid sulfite; (c) 0.5-20% of NR1R2R3-represented trialkylamine compounds or N<+>R4R5R6R7-represented quaternary ammonium compounds or NH2R8-represented aliphatic amine compounds, wherein R1-R7 in the formula are selected from C1-C14 straight chain or branched chain alkyl or alkyl derivatives, R8 is selected from straight chain or branched chain alkyl or alkyl derivatives; (d) 10-80% of urea, thiourea or ammonia liquor; (e) 5-60% of ethylenediaminetetraacetic acid. The technical scheme of the invention better solves the problems and can be used in industrial production of oil displacement.

The invention relates to a preparing method of high-intensity high-temperature-resistance polymer nanometer microspheres. The preparing method comprises the following characteristic process steps that itaconic acid is neutralized by a sodium hydroxide solution; acrylamide, cross-linking agents and a hectorite aqueous dispersion are added; the mixture is uniformly stirred, and a monomer and hectorite mixed solution is obtained; then, the monomer and hectorite mixed solution is added into a three-necked flask containing oil-soluble solvents and Span80/Tween80 composite surfactants; uniform stirring is carried out, and a transparent reversed-phase microemulsion is formed; the reversed-phase microemulsion is heated, then, a certain amount of oxidizing agents and reducing agents are added for initiating reversed-phase microemulsion polymerization; and demulsification, precipitation, washing, drying and fine grinding are carried out, and white polymer nanometer microsphere powder is obtained. The polymer nanometer microspheres prepared by the preparing method provided by the invention have the proper water absorption and salt absorption properties, better water absorption swelling property, higher jelly strength and higher temperature resistance, and meet the ultra-low permeability reservoir profile control and water shutoff requirements that the water absorption speed of polymer deep profile control agents is not suitable to be too high or too low, the water absorption rate is not suitable to be too high or too low, the permeability is smaller than 1*10<-3>[mu]m<2>, and the pore throat radius is smaller than 8[mu]m.

The invention relates to an oil-displacing agent composition for improving a recovery ratio of a high-temperature reservoir and a preparation method of the composition, mainly solving the problems that a polymer-containing oil-displacing agent in the prior art is poor in temperature resistance, salt resistance and thermal stability resistance, and low in displacement efficiency. In order to solve the problems better, a following technical scheme is adopted as follows: the oil-displacing agent composition comprises the following components in percentage by weight: 0.005%-8.0% of high-temperature-resistant and oil-displacing acrylamide polymers, 0.005%-5.0% of a fatty alcohol polyoxyethylene ether carboxylate surfactant and 87.0%-99.99% of injected water. The preparation method of the oil-displacing agent composition comprises the following steps: regulating a pH value; ventilating a nitrogen gas and removing an oxygen gas; carrying out hydrolysis reaction; drying, crushing and sieving to obtain acrylamide polymers; stirring the acrylamide polymers, the fatty alcohol polyoxyethylene ether carboxylate and the injected water for 0.5 hour-5 hours at 5 DEG C-45 DEG C, and uniformly mixing to obtain the oil-displacing agent composition. And therefore, the oil-displacing agent composition can be used for tertiary oil recovery production of the high-temperature reservoir.

This invention relates to a method to prepare superabsorbent polycrylic acid (or its salt) resin by verse-suspension polymerization, with cyclohexane adopted as solvent, crylic acid as monomers, K2S208 as initiators and N, N'-methylenebisacrylamide as cross-linking reagent. It has the characteristics that the dispersants for verse-suspension in the reaction system can be monoglyceryl ester or octadecyl phosphatide/span-60 complex or octadecyl phosphatide/monogylceryl ester complex and the dispersants weigh 2~20% of crylic acid monomers. The superabsorbent polycrylic acid resin prepared in this invention is white or light yellow visible impurity-free gel solid or solid particles, with sufficient gel strength, a water absorption of over 600ml/g and a salt solution absorption of over 70ml/g.

The invention belongs to the field of catalysts, and discloses a monatomic catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) synthesizing a SiO2-coated GO composite material by coating SiO2 nanospheres with graphene oxide; (2) synthesizing a SiO2-coated GO-coated PDA composite material by coating the SiO2-coated GO composite material with polydopamine; (3) synthesizing an RGO-coated NC composite material by coating reduced graphene oxide with nitrogen-doped carbon; and (4) synthesizing an RGO-coated NC/Pd monatomic catalystby loading the RGO-coated NC composite material with Pd monatoms. According to the preparation method disclosed by the invention, the overall process flow of the preparation method is set, and the reaction conditions and parameters of each key process step are improved, so that the dispersity, the catalyst activity and the cycling stability of metallic single atom can be effectively improved.

The invention relates to a Ziegler-Natta polyethylene catalyst used for vinyl polymerization, a preparation method and an application thereof. The main catalyst component of vinyl polymerization catalyst is prepared by the reaction with the following method: using magnesium powder as raw material for reaction to generate new ecological halide; leading the new ecological halide to have complexation reaction with titanium compound and treated silicon dioxide under the condition that electron donor exists; leading complexation product to have contact reaction with alkyl aluminium compound in alkane solvent system; and after heating and drying, having complexation reaction on the product of the contact reaction and polymer containing polar functional group in the alkane solvent system. The polyethylene catalyst is formed by the main catalyst component and cocatalyst metal organic compound, is higher in polymerization activity, and has the advantage that the produced polymer has wider molecular weight distribution.

The invention provides a reaction die for a polymer optical fiber prefabricated bar, which includes a non-rigid polymerization container with closed lower end, a removable top cover and a tense polytetrafluoroethylene rope or metal wire, wherein the top cover is provided with a hole which makes an inner cavity of the polymerization container communicated with outside, circumference of the top cover is closely combined with the polymerization container, the polytetrafluoroethylene rope or metal wire is arranged at axle center of the polymerization container and penetrates overall length of the polymerization container. The reaction die has simple structure, and is suitable for industrial popularization. The invention also provides a method for preparing the polymer optical fiber prefabricated bar by using the reaction die. The method has simple operation, and is easy for industrial use, the prefabricated bar prepared by the method has flattening surface, less bubble, obvious fiber core cladding boundary and controllable diameter, is easy to be drawn to form fiber and realize doping to prepare various functional optical fiber prefabricated bar.

The invention discloses an efficient clay inhibitor for shale gas fracturing and a preparation method of efficient clay inhibitor. The efficient clay inhibitor for shale gas fracturing comprises the following raw materials in parts by weight: 650-850 parts of water, 190-230 parts of cationic monomer, 100-140 parts of acrylamide, 0.5 part of EDTA, 0.5-3 parts of an initiator A and 0.5-3 parts of an initiator B. According to the invention, the solid content of the synthesized efficient clay inhibitor is about 35%, and an anti-swelling ratio is 80.3% when the dosage is 0.5%; the efficient clay inhibitor is an excellent clay inhibitor with less dosage, quick action and low price. In addition, the efficient clay inhibitor has high temperature resistance, more durable shale stability and excellent compatibility. According to the efficient clay inhibitor for shale gas fracturing, the production synthesis temperature is 40 DEG C, the polymerization reaction is stable, the production efficiency is high, and the product performance is very stable.

The invention discloses a preparation method and application of a fibrous catalyst. The preparation method comprises the following steps: (1) synthesizing a fiber @ polydopamine composite material; (2) preparing a fiber@ polydopamine-precious metal composite material; (3) finally obtaining the fibrous catalyst. The fibrous catalyst is applied to fixed beds. By using reaction materials which are low in cost and easy to get, the prepared fibrous catalyst is easy to separate and recover, can be applied to fixed beds, can be used for realizing continuous catalystic reaction, has positive effect for reducing the application cost of the catalyst and has the advantage of improving the production efficiency.

The invention provides a whole oil-based drilling fluid viscosifier and a preparation method thereof. The preparation method for the whole oil-based drilling fluid viscosifier comprises the steps: 1) uniformly mixing 15-50 parts by weight of polyester polyol, 5-15 parts by weight of a polymerization promoter and 50-150 parts by weight of a solvent at room temperature so as to obtain a mixture; 2) heating the mixture to 40-60 DEG C, adding 15-80 parts by weight of isocyanate and 0.3-1.0 part of a polymerization catalyst under a stirring condition, and continuing to heat the mixture to 70-90 DEG C and enabling the mixture to react for 3-5 h so as to obtain an intermediate product; and 3) cooling the intermediate product to 40-50 DEG C, adding 5-15 parts by weight of a polymerization promoter, heating to 60-80 DEG C and continuing a reaction for 2-3 h so as to obtain the whole oil-based drilling fluid viscosifier. The whole oil-based drilling fluid viscosifier prepared by the preparation method can effectively improve suspension stability of a drilling fluid and improve the rheological property of the drilling fluid without changing the density of the drilling fluid; and therefore, the whole oil-based drilling fluid viscosifier is suitable for exploration and development of low pressure reservoirs.

The invention relates to a preparation method of ultra-high molecular weight cationic polyacrylamide, which belongs to the acrylamide aqueous solution polymerization technical process. The method is characterized in that a cation monomer is acryloyloxyethyl trimethyl ammonium chloride or methacryloyloxyethyl trimethyl ammonium chloride, the amount of the cation monomer accounts for 5-60% of mass of the mixed monomer; an single azoamidine compound initiator is used, the amount of the azoamidine compound initiator accounts for 0.005-0.035% of the monomer mass; initiation is carried out at low temperature, thermal insulating polymerization is carried out, and the initiation temperature is 5-30 DEG C; a cosolvent, a chain transferring agent and addition of the cosolvent account for 2-5% of monomer mass, the addition of the chain transferring agent accounts for 0.01-0.07% of monomer mass, the pH value is adjusted to 6-7, and nitrogen is introduced for removing oxygen for polymerization. The preparation method of ultra-high molecular weight cationic polyacrylamide can prepare the product with relative molecular weight greater than or equal to 25,000,000. The dissolvability is good, the ultra-high molecular weight cationic polyacrylamide accords with the industrial standard, and is easy for large-scale industrial production, and the method can be widely used for the industries of tertiary oil extraction, sewage processing, papermaking, weaving, printing and dyeing and the like.

The invention discloses an ATRP method for constructing a series of low-toxicity and high-efficiency cationic gene vectors with PGMA (polyglyceryl methacrylate) as a skeleton in the technical field of the non-viral gene vectors. The ATRP method is smooth in polymerization reaction and easy to control; according to the ATRP method, a variety of high-performance cationic gene vectors with different molecular weights and narrow molecular weight distribution can be prepared as required; and the prepared cationic gene vectors are good in storage stability, have a transfection efficiency higher than the gold standard PEI in Hepg2, C6, Cos7, HEK293 and other cells, are easy to use and have a commercial potential.

The present invention provides a temperature-resistant and salt-resistant hydrophobic association polymer preparation method, which comprises: (1) sequentially adding deionized water, disodium ethylenediaminetetraacetate, an acrylamide monomer, N,N-dioctylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, a surfactant, a co-solvent, a chain transfer agent and an inorganic salt to a polymerization kettle, uniformly stirring, and cooling to a temperature of 5-10 DEG C under the action of frozen salt water; (2) introducing high purity nitrogen for 1-2 h, adding a multi-stage composite initiator, carrying out an adiabatic polymerization reaction for 5-7 h, taking out a colloid, and granulating; and (3) adding a hydrolysis agent, carrying out hydrolysis for 2-4 h at a temperature of 90-110 DEG C, and drying for 2-3 h at a temperature of 90-110 DEG C to obtain the temperature-resistant and salt-resistant hydrophobic association polymer. According to the present invention, the prepared temperature-resistant and salt-resistant hydrophobic association polymer has advantages of good tackifying property, good temperature resistance, good salt resistance, good shearing resistance, good long-term stability, and high oil displacement efficiency.

The invention provides a catalyst system used for preparing ultra-high molecular weight polyethylene. According to the invention, the catalyst system comprises active ingredients, outer electron donors and catalyst promoters; wherein, the total weight of active ingredients of the catalyst based on 100 parts by weight comprises 12.0 to 18.0 parts by weight of magnesium, 4.0 to 8.0 parts by weight of titanium, 1.1 to 11.0 parts by weight of alkoxy group and 55.0 to 75.0 parts by weight of halogens by weight. The method for preparing the active ingredients comprises the steps that: serous fluid of magnesium-alcohol complex is prepared, the serous fluid reacts with the electron donor of (R)nSi, pre-loading titanium reacts with loading titanium. The ultra-high molecular weight polyethylene is prepared by adopting the synergistic effect of the active ingredients, R <1> R <11> Si (OR <111>) <2> and the organoaluminium compound R 3-n ALX n of the invention. The catalyst system of the invention has the advantages of high bulk density, excellent dynamic stability, and the ultra-high molecular weight polyethylene prepared has the advantages of good product form, mean particle distribution and high bulk density; the molecular weight can be adjusted between 2 million and 7 million.

The invention discloses preparation of a fibrous catalyst loaded with metal nanoparticles and application. The preparation method comprises the following steps: adding metal salt into a solution system containing trihydroxy methyl aminomethane, fiber and dopamine hydrochloride to obtain mixed solution, then stirring, polymerizing dopamine to obtain polydopamine, wrapping fiber with the polydopamine, and simultaneously loading the metal nanoparticles; then, carrying out heat annealing treatment under the atmosphere of inertial gas to prepare a fiber@nitrogen-doped carbon metal compound material, namely the fibrous catalyst loaded with metal nanoparticles. The preparation and the application disclosed by the invention have the beneficial effects that by setting of a whole process flow of thepreparation method and improvement on reaction conditions and parameters of all key process steps, the activity and the cycling stability of the loaded nano-metal catalyst can be effectively improved.

A composition of ethylene gas polymerization and polymerized catalysts and its preparation method. It is composed by catalyst carrier, main catalyst, and co-catalyst, which is characterized in, active silicon dioxide as the carrier, the main catalyst containing at least a titanium compound, a slurry catalyst with dehydrated mineral oil as the disperser, aluminum alkyl as the co-catalyst. The method comprises: supporting mixed solution of TiCl3,MgCl2 and THF on the active silicon dioxide carrier, after prereducing, the mixed solution mixing with dehydrated mineral oil and forming slurry catalyst main body, which consists of the catalyst system with aluminum alkyl. The catalyst system is suitable for ethylene gas polymerization and co polymerization, especially for high-performance catalystfor producing low-density polyethylene by gas polymerization.

The invention provides a preparation method of chloroethylene-n-butyl acrylate copolymer resin with a suspension process and belongs to the technical field of chemical polymer synthesis. The suspension polymerization process is adopted, and a polymerization formula is adjusted and optimized, and the n-butyl acrylate copolymer adding technology is controlled, therefore, the prepared chloroethylene-n-butyl acrylate copolymer resin product has the advantages of regular shape, concentrated size distribution, higher apparent density and lower oil absorption rate, is transparent and presents remarkable internal plasticity and impact resistance.

The invention discloses a method of preparing ethylene propylene diene monomer (EPDM) graft polymer through solution grafting copolymerization and an application thereof in the preparation of engineering plastics. The method optimizes and improves the preparation method on the basis of the solution grafting copolymerization preparation of EPDM-g-SAN, introduces polar monomer MMA, synthesizes EPDM-g-MAN or EPDM-g-MAS which has less content of AN unit of the graft chain, on the condition of low AN dosage; in addition, the highest monomer conversion rate of the method can reach 70-95% by adjusting the monomer proportioning so as to increase the grafting rate and grafting efficiency of the grafting copolymerization system and significantly improve the compatibility between EPDM graft polymer and SAN resin and the toughening efficiency of EPDM graft polymer to SAN resin. By mixing the EPDM graft polymer prepared in the invention and SAN resin, impact resistance engineering plastics with excellent weather resistance, aging resistance and yellowing resistance and high glossiness can be prepared.