41results about How to "Promote polycondensation reaction" patented technology

The invention discloses a triazinyl organic mesoporous polymer as well as a preparation method and application thereof, belonging to the field of synthesis and adsorption research of an organic porous material. According to the preparation method, a solvothermal method is adopted, ethylene glycol is taken as a reaction medium, tripolycyanamide and paraformaldehyde are taken as raw materials, and a reaction is performed for certain time under a high-temperature and sealed condition to prepare the triazinyl organic mesoporous polymer. The preparation method provided by the invention is cheap in price, simple in process, clean, free of foreign smell, convenient to operate and is benefit for industrial production. The prepared triazinyl organic mesoporous polymer has an open fiber framework structure, is rich in nitrogenous functional groups, can absorb various pollutants in water, and has good application prospect in the aspects of adsorption separation, water body purification and the like.

The invention relates to a method for preparing aromatic polyamide fiber by adopting a micro-reactor. Liquid carbon dioxide and/or supercritical carbon dioxide are adopted as a solvent. The micro-reactor is adopted as a reactor in a pre-polymerization stage. The polymer intrinsic viscosity and the yield of the aromatic polyamide fiber prepared by the method are high. The solvent recovery rate is high.

A polycarbonate synthesis process comprises steps as follows: S1, a raw material mixing stage: melt isosorbide and dialkyl carbonate are stirred and uniformly mixed in a raw material mixing tank; S2, an ester exchange reaction stage: a tower reactor located behind the raw material mixing tank is taken as an ester exchange reactor, and released hydroxyl and aryl reaction products can be removed continuously; S3, a pre-polymerization reaction stage: a kettle pre-polycondensation reactor is arranged behind the ester exchange reactor, a pre-polymerization product is generated in the pre-polycondensation reactor, and meanwhile, released hydroxyl and aryl reaction products are removed continuously; S4: a polycondensation reaction stage: a hydraulic driven horizontal disk polycondensation reactor located behind the pre-polymerization reactor performs microwave processing on a pre-polycondensation product, and the pre-polycondensation product is subjected to polycondensation to form polycarbonate melts. The released hydroxyl and aryl reaction products are removed continuously, so that reaction balance is pushed in the positive direction, the pre-polycondensation product is heated through microwaves in the polycondensation stage, and the reaction rate can be effectively increased.

The invention relates to the technical field of chemical fiber manufacturing, in particular to a method for preparing titanium dioxide-modified polyamide fibers. Caprolactam is used as a raw material, and a polyamide prepolymer is obtained after pressurized ring opening, and a certain amount of titanate is introduced into the system , continue the reaction under the condition of nitrogen protection, the water produced by the polycondensation reaction of the polyamide prepolymer reacts with the titanate, so that the titanate is slowly hydrolyzed to form titanium dioxide. Adopting the preparation method of titanium dioxide modified polyamide fiber provided by the present invention solves the problem that the current preparation method of titanium dioxide modified polyamide fiber cannot uniformly disperse titanium dioxide, and the method of adding a dispersant to in-situ polymerization has the problem that the dispersant is washed out during the extraction process At the same time, the dispersant has the problem of affecting the polymerization process of caprolactam.

The invention belongs to the technical field of water treatment and water pollution prevention, and relates to a particle electrode and a preparation method thereof and a three-dimensional electrolytic reactor and application of the three-dimensional electrolytic reactor. The particle electrode is formed by loading g-C3N4 and TiO2 on activated carbon after g-C3N4 and TiO2 are compounded, wherein the mass of g-C3N4 accounts for 40%-50% of the total mass of a g-C3N4-TiO2 compound, and the particle electrode is a g-C3N4-TiO2/AC particle with visible-light catalytic activity. The three-dimensionalelectrolytic reactor is filled with the g-C3N4-TiO2/AC particle, the mass transfer effect of an upflow type fluidized bed is improved, the short circuit current is eliminated, and the current efficiency is improved; and under the conditions of the electric field and the illumination, the electrolysis reaction and the photocatalytic reaction generate synergistic effect on the g-C3N4-TiO2/AC particle electrode, and the three-dimensional electrolytic reactor has a better treatment effect on nonbiodegradable matter.

The invention discloses a high-toughness abrasion-resistant damping cable used for ships. The high-toughness wear-resistant damping cable comprises a conductor, an insulating layer, a filling layer, a shielding layer, an armored layer and an external sheath. The raw material of the external sheath includes the following parts by weight: 50-60 parts of polybutadiene rubber, 20-25 parts of EPDM rubber, 15-18 parts of chlorinated polyethylene 140B, 8-12 parts of high-toughness high-heat-insulation performance gel, 1-1.5 parts of sulfur powder, 1.4-1.7 parts of promoter DM, 2.1-2.4 parts of promoter TMTM, 5-7 parts of trioctyl trimellitate, 2-3.5 parts of tributyl citrate, 25-28 parts of barite powder, 17-20 parts of high-abrasion-resistant carbon black, 12-15 parts of nano calcium carbonate, 7-10 parts of ultrafine talcum powder, 6-9 parts of hard pottery clay, 5-8 parts of kaolin, 2-4 parts of red phosphorus, 0.3-0.6 part of NOBS, 0.5-1 part of antioxidant RD and 2.5-4 parts of antioxidant RD.

The invention discloses a titanium alloy surface adhesion promoter and a preparation method thereof. The adhesion promoter comprises 25%-30% of silane coupling agents, 12%-15% of epoxy resin and 55%-60% of mixed solvents. Materials are prepared according to the formula, the epoxy resin and the mixed solvents are added into a reactor and uniformly stirred, temperature is increased to 55+/-5 DEG C,the silane coupling agents are dropped into the reactor within 40-60 minutes under the condition of stirring, reaction temperature is controlled to be within the range of 70-80 DEG C after dropping, and heat reaction is performed for 4-5 hours to obtain the titanium alloy surface adhesion promoter. The adhesion promoter is an organic-inorganic self-curing resin functioning as a bridge between a titanium alloy surface and a coating, the resin facilitates formation of chemical valence bonds by the coating and a base material, surface energy of the titanium alloy base material can be improved, cohesive energy is high, and the adhesion of the coating on a titanium alloy is further improved.

The invention relates to a method and a device for continuously producing an aqueous solution of long-carbon-chain nylon salt, belonging to the field of preparation and production of nylon salts. Thepreparation method comprises the following steps: melting long-carbon-chain diacid, mixing the molten long-carbon-chain diacid with long-carbon-chain diamine and water, carrying out a secondary salifying reaction, and adjusting the pH value of the aqueous solution to obtain the aqueous nylon salt solution for a polycondensation reaction. The device comprises a continuous melting unit for the long-carbon-chain diacid and a corresponding control system thereof, a salifying reaction unit and a corresponding control system thereof, and a salt storage unit. According to the method, water is used asa solvent, organic solvents such as alcohol are avoided, production technological process is simplified, the quality of the produced long-carbon-chain nylon salt is guaranteed by flexibly controllingparameters such as temperature and pH in the production process, production cost is reduced, and large-scale production is facilitated.

The invention provides a hyperbranched cationic polymer emulsion, and an application thereof in sludge dewatering. A first phase, a second phase and a third phase are prepared in advance, a key catalyst is introduced, an initiator, a chain transfer agent and a catalyst are added to the third phase, a lower temperature polymerization reaction is carried out, the second phase is slowly dropwise added in the polymerization to obtain a hyperbranched polymer system, the first phase is slowly dropwise added to the hyperbranched polymer system, and a high temperature polymerization reaction is carried out to obtain the hyperbranched cationic polymer emulsion. The emulsion is highly branched, forms a three-dimensional network structure, is not prone to entangle between molecules, contains a largenumber of terminal functional groups, and has the advantages of strong chemical reactivity, high molecular weight, high cationicity and good sludge dewatering effect.

The invention discloses a preparation method of a coal mining closed filling material, and belongs to the technical field of sealing material preparation. The preparation method comprises the following steps: taking vinyl tri-methoxysilane as a raw material for reaction to obtain organic silicon resin; then after treating a coupling agent for carbon black, introducing sulfydryl and cobalt element, and catalyzing resin and carbon black for carbonization to form a carbon layer during burning so as to strengthen fire resistance; then ball-milling sodium silicate, metakaolin and the like; finally stirring and reacting with an accessory ingredient so as to obtain the coal mining closed filling material. The obtained filling material does not contain highly acidic toxic substances such as residual formaldehyde, cannot cause damage on constructors and underground environments, and simultaneously is good in material mechanics properties and excellent in material flame retardant property, so that the problems of smoking and spontaneous combustion caused by heat accumulation when a traditional filling material reacts are avoided, and the filling material has a wide application prospect.

The invention provides a method for preparing high-molecular-weight polylactic acid through direct condensation polymerization, which comprises the following steps of: stirring and heating dehydrated lactic acid to 90-120 DEG C; carrying out heat preservation for 10-30 minutes at a vacuum degree of 0.060-0.065MPa; dropwise adding the mixed solution of a tin catalyst, and carrying out heat preservation and reacting for 10-30 minutes; heating to 160-200 DEG C, and carrying out heat preservation and reacting for 4-9 hours at a vacuum degree of 0.065-0.095MPa to obtain a crude product; and purifying, filtering and drying the crude product to obtain high-molecular-weight polylactic acid. According to the invention, the tin catalyst is dispersed in an organic solvent and dropwise added into the reaction system, the inactivation of the tin catalyst can be effectively prevented, the condensation polymerization reaction of lactic acid can be uniformly accelerated, and the reaction time is shortened; and moreover, the reaction byproduct can be discharged out of the reaction system along with the organic solvent in the mixed solution of the tin catalyst at low vacuum degree so that the reaction goes rightward and the reaction speed is increased.

The invention discloses an acid-resistant spray coating suitable for a globe roof of a hot blast stove. The acid-resistant spray coating comprises the following components in percentage by mass: 50 to 65 wt% of mullite aggregate, 16 to 25 wt% of 70 high aluminum powder, 3 to 6 wt% of alpha-Al2O3 micro powder, 2 to 6 wt% of quartz powder, 1 to 4 wt% of kyanite particles, 0.1 to 0.6 wt% of a tackifier, 0.5 to 2 wt% of a curing agent, 0.2 to 0.6 wt% of an accelerant and 10 to 13 wt% of modified quick-drying silica sol. According to the semi-dry spray coating with the silica sol as a binding agent, substances with low melting point are not brought in, and the high-temperature performance is ensured. The polycondensation reaction of silica sol siloxane bonds can be promoted in an acid environment, the strength is not reduced but also improved after acid erosion, the surface layer is intact, the sign of erosion does not occur, and the service life of the hot blast stove is prolonged.

The invention relates to the technical field of sand casting, in particular to furan resin for casting and a production method thereof, which can improve the strength, can improve the adhesion property, and can reduce the influence on the sand casting. The furan resin for casting is prepared by performing addition reaction, condensation reaction and aldehyde reduction reaction on the following rawmaterials in parts by weight: 100 to 200 parts of water, 50 to 80 parts of furfuryl alcohol, 10 to 20 parts of formaldehyde, 5 to 10 parts of a catalyst, 1 to 2 parts of an aid, 20 to 30 parts of urea, 5 to 10 parts of an aldehyde reduction agent, and 2 to 5 parts of oxidized starch.

The invention provides a separation method of oily sludge and application of sludge impurities to preparation of active carbon. The separation method comprises the following steps of (1) pretreating the oily sludge: putting the oily sludge under microwave conditions for microwave treatment; performing demulsification treatment and dewatering on the oily sludge subjected to microwave treatment to obtain pretreated oily sludge; (2) separating the oily sludge: in a nitrogen environment, putting the pretreated oily sludge under heating conditions; performing dry distillation; respectively collecting gas phase and impurities after dry distillation. The application concretely comprises the steps of under the existence condition of activating agents, under the inert gas protection conditions, putting the impurities after the dry distillation under the temperature condition of 280 to 350 DEG C; performing pre-activation for 20 to 30 min; then, performing activation for 1 to 2 h under the temperature condition of 700 to 850 DEG C to obtain the high specific area active carbon. The separation method achieves the effects that the separation effect is good; the separated impurities can be effectively utilized.

The invention belongs to the technical field of carbon material preparation and provides a device and a method for rapidly preparing high-yield activated carbon by coupling of a pressure pump with microwaves. The device comprises a programmed controller, a feed unit, a reaction furnace, a pressure pump unit, a microwave heating unit, an explosive spraying and cooling unit and a pyrolysis gas treating unit. Friction and collision of raw material molecules are caused by the microwaves, reaction activation energy is reduced, and the process operation time is shortened greatly. Retention time of volatile matter is prolonged by pressing of the pressure pump, the volatile matter is promoted to be deposited on surface of semi-coke, and accordingly, yield of solid carbon is increased; condensationpolymerization of tar is also promoted by pressing, and production of the tar is reduced substantially or avoided. Besides, pyrolysis gas can be produced from inside of the raw materials by the aid of microwave heating, pyrolysis gas molecules retain in the raw material molecules under the pressing action to play a role of in-situ self-template and shuttle back and forth freely in the raw materials non-directionally to substantially promote pore development of the activated carbon, the instantaneous popcorn effect is beneficial to secondary pore forming of the pyrolysis gas, and the specificsurface area of a carbon material is increased.

The invention relates to the field of water reducing agents, in particular to a high-efficiency water reducing agent and a preparation method thereof. The water reducing agent is prepared from, by weight, 10-15 parts of naphthalene oil, 4-9 parts of caustic soda liquid, 15-20 parts of acetone, 5-11 parts of formaldehyde, 7-12 parts of potassium permanganate, 4-9 parts of sodium nitrite, 13-21 parts of concentrated sulfuric acid and an appropriate amount of water; the water reducing agent effectively makes up for the defects to a certain degree that existing water reducing agents easily mildewand are low in production efficiency.

The invention relates to the field of textile technology and particularly relates to a polyester yarn production raw material conveying device and solves the problems of the prior art that the conveying device does not have continuity and the structure is complicated, which have caused that the operation time in polyester yarn production is increased and the working efficiency is reduced. The polyester yarn production raw material conveying device comprises a reaction tank, a conveying channel, a conveying box and a discharge box, wherein a through hole is formed in the exterior of the reaction tank, and a feed pipe is arranged in the through hole; a second motor is arranged at the upper end, close to the feed pipe, of the reaction tank; an output end of the second motor is connected witha rotary rod; the rotary rod extends into the reaction tank; a stirring rod is arranged outside the rotary rod in a threaded manner. After flowing toward the lower side of the reaction tank through arotation plate, the raw material flows into the conveying box through the conveying channel, thus the conveying of the polyester yarn production raw material is continuous, the smoothness of the raw material conveying by the conveying device is guaranteed, and the working efficiency of the raw material conveying operation is improved.