104results about How to "The polymerization reaction is fast" patented technology

The invention discloses a method for preparing a polymer by micro-scale photo-induced organic catalysis. The method comprises the following steps: using alkyl halide as an initiator in a microreactor; and using an organic small molecule as a catalyst to catalyze atom-transfer radical-polymerization, so as to prepare the polymer. Compared with the prior art, the method provided by the invention has advantages of high reaction speed, controllable molecular weight and molecular weight distribution of a polymerization product, no residue, and wide application in fields of optoelectronic materials and biomedical materials.

The invention discloses a water-based electrode binding agent and a preparation method thereof. According to the water-based electrode binding agent, an emulsion polymerization system is adopted, and a reversible addition-fragmentation chain transfer free-radical polymerization technology is used for preparing butyl acrylate/styrene/methyl acrylate block copolymer latex which is used as the electrode binding agent. A preparation process has the advantages of energy saving and environment protection; compared with a traditional binding agent polyvinylidene fluoride, the water-based electrode binding agent has the advantages of low price, simple process, no pollution and the like; the discharge specific capacity of a used electrode in a lithium iron phosphate electrode can reach 153.4mAh/g, and the discharge specific capacity in a graphite electrode can reach 358.6mAh/g; and therefore, the water-based electrode binding agent has great application prospects.

The invention provides a preparation method for improving interfacial properties of a carbon fiber composite material. The method is characterized by comprising the steps of firstly, preparing plasma activated carbon fiber; secondly, preparing a maleic anhydride dimethylbenzene solution; thirdly, subjecting the activated carbon fiber to ultrasonic infiltration; fourthly, performing grafting of maleic anhydride; and fifthly, purifying a crude product of the plasma activated carbon fiber which the maleic anhydride is grafted to. The method has the advantages that the free radicals formed on the surface of carbon fiber are processed through plasmas of argon-oxygen mixed gas, so that the polymerization reaction speed of the free radicals and the maleic anhydride is accelerated and the degree us improved; the reaction speed is accelerated through a high temperature, and the grafting reaction time is only 3 min to 7 min, so that grafting carbon fiber which is uniform in surface coating and high in grafting rate and has certain quantities of anhydride groups is obtained, the grafting carbon fiber and epoxy resin are subjected to reaction well, and the interfacial properties of the composite material is improved; and the method is energy-saving, environment-friendly and convenient to process.

The invention relates to a preparation method for anti-pilling, anti-ageing and normal-pressure cation dyeable polyester chips. The preparation method comprises procedures of primary esterification, transesterification, secondary esterification and polymerization, wherein three monomers are added in the transesterification procedure; a hindered amine light stabilizer, a hindered phenol antioxidant and hydroxyl silicon oil are added after the secondary esterification and before prepolymerization; and the polyester slices are precrystallized and dried before the spinning procedure. A fabric prepared from fibers spun by the polyester chips has a high anti-pilling property and high light fastness; the polyester fibers can be dyed with various bright colors due to the normal-pressure cation dyeable property; the unified requirement of high-grade spring and summer clothing at present on functionality and color is met; and the polyester fibers and wool can be dyed in the same bath and a good clothing effect of the fibers blended with the wool is achieved. The polyester fibers spun by the polyester chips are important supplement for the cation dyeable polyester fiber market at present and have wide market prospect.

The invention relates to a method for preparing a high-comfortable composite functional polyester fiber, comprising the steps of: first esterification reaction section, secondary esterification reaction section, polymerization reaction process and spinning process, wherein aliphatic dicarboxylic acid and/or non-centrosymmetrically aromatic dicarboxylic acid is led into the first esterification reaction section to serve as a third monomer; flexible polyethylene glycol is led into the secondary esterification reaction section to serve as a fourth monomer; after finishing the esterification reactions, hindered amine light stabilizer and hindered phenolic antioxidant which are respectively prepared by taking acetic acid and ethylene glycol as solvents and hydroxyl silicone oil are added; after finishing pre-polymerization and before final polymerization of the polymerization reaction process, ultraviolet light absorber and antistatic agent are added; and before finishing the spinning process, polyester slices are performed pre-crystallization and drying; fibers with odd-shaped cross sections of three-leaf, cross, five-leaf and the like are prepared by melt spinning. The obtained polyester fiber is anti-ultraviolet light, antistatic, anti-pilling and has wet-absorbing quick-drying performance; and the fabric has high comfort.

The invention relates to a preparation method for a polyester fiber with a composite ultraviolet, static electricity and pilling resisting function. The preparation method comprises an esterification reaction procedure, a polymerization reaction procedure and a spinning procedure. The esterification reaction procedure comprises a primary esterification reaction stage and a secondary esterification reaction stage, flexible polyethylene glycol is introduced as a third monomer in the secondary esterification reaction stage, and after esterification is finished, a hindered amine light stabilizer,a hindered phenol anti-oxidant and hydroxyl silicone oil are added, wherein the hindered amine light stabilizer and the hindered phenol anti-oxidant are prepared by taking an acetic acid and ethyleneglycol as solvents. In the polymerization reaction procedure, after prepolymerization and before final polymerization, an ultraviolet absorbent and an antistatic agent are added. Before the spinning procedure, polyester is sliced for pre-crystallization and drying. The polyester fiber obtained by the method has the outstanding ultraviolet, static electricity and pilling resisting functions, and after being woven into knitted machine-made fabrics, is tested to have related technical indexes comprising the ultraviolet light transmittance of less than or equal to 5.0%, the pilling resistance of more than or equal to level 4 and the fiber volume specific resistance of less than or equal to 10*10<10> ohm.cm.

The invention discloses a method for preparing n-type doped zinc oxide nanometer powder, belonging to the preparation of nanometer materials. A general formula of the n-type doped zinc oxide is ZnO: M, wherein M is selected from Ga, In and Al. The preparation method comprises the following steps: adding M-containing soluble salt and Zn-containing soluble salt to aqueous solution of acrylic acid according to a certain proportion; adding aqueous solution of peracetic initiators; heating at 60-100 DEG C to ensure the system to completely polymerized; drying, cooling, grinding, and calcining in amuffle; and treating the obtained product at high temperature in reducing atmosphere. The invention has simple technique and is suitable for large-scale preparation and industrial mass production. Theprepared powder has good dispersibility, uniform size in the range from 20 to 120 nm, homogeneous phase without impurity, lighter color and higher conductivity and is particularly applied to the fields of transparent heating insulating materials, light color antistatic materials and the like.

The invention discloses a superhydrophobic polyester resin powder coating, the raw materials of which include by weight: 45-50 parts of polyester resin, 22-26 parts of phenolic resin, 17-20 parts of hydroxyl acrylic resin, 13-20 parts of fluorine-containing hydrophobic material 16 parts, 8-12 parts of asphalt, 6-9 parts of magnesium carbonate, 6-8 parts of aluminum hydroxide powder, 1-3 parts of barium sulfate, 2-3 parts of zinc powder, 3-5 parts of curing agent, 2 parts of leveling agent -5 parts, 1-2 parts of matting agent, 1-3 parts of antioxidant, 1-2 parts of pigment dispersant. The superhydrophobic polyester resin powder coating proposed by the invention has excellent hydrophobic performance and is a powder coating with good antirust performance.

The invention discloses a polymeric reactor and a polyester production method. The polymeric reactor comprises a closed horizontal cylinder. A front end rotating shaft is arranged at the portion, close to a material inlet, inside the cylinder. One end of the front end rotating shaft stretches out from the cylinder and is connected with a first power device. A rear end rotating shaft is arranged at the portion, close to a material outlet, of the cylinder, and one end of the rear end rotating shaft stretches out from the cylinder and is connected with a second power device. A supporting structure for supporting the front end rotating shaft and the rear end rotating shaft is arranged inside the cylinder. A cage frame type stirrer is arranged on the front end rotating shaft. A section of screw-type disc is arranged at the portion, close to the front end rotating shaft, of the rear end rotating shaft. A plurality of sets of coaxial circular rings are arranged at the other parts of the rear end rotating shaft. A plurality of scrapers parallel to the faces of the circular rings are arranged among the circular rings. According to the method, the polymeric reactor is used for performing polyester production to obtain a high-viscosity polyester melt. The cage frame type stirrer is arranged at the front end, the multiple circular rings are arranged at the rear end, and the devolatilization efficiency of equipment can be effectively improved.

The invention discloses a clamp-type iron complex and a preparation method and application thereof, and belongs to the field of catalysis technologies. The clamp-type iron complex is based on [NCN]-coordination. The preparation method comprises the following steps of: adding a butyl lithium solution into a ligand solution under the condition of the temperature of -78 to -40 DEG C, and reacting to obtain a reaction solution; adding ferrous chloride into the reaction solution, naturally raising the temperature to room temperature, and continuing reaction; and adding hexane to perform filtration and recrystallization. A catalyst consisting of the [NCN]-coordination clamp-type iron complex and alkyl aluminum is used for catalyzing butadiene syn-1,4 to perform selective polymerization. The clamp-type iron complex is convenient to prepare and high in stability; during selective polymerization of the butadiene under the catalyst, the using amount of the catalyst is small, the polymerization reaction speed is high, the conversion efficiency is high, and syn-1,4 selectivity is relatively high, and polymer molecule weight and molecule weight distribution are controllable; the system formed by the catalyst is homogeneous; the clamp-type iron complex is convenient to use; during polymerization, the temperature fluctuation range is small; and the reaction is easy to control.

The invention discloses a preparation method of antimony-doped tin oxide nano-powder, which belongs to the field of preparation of nanomaterials. The preparation method comprises the following steps:(1) mixing propenoic acid with water according to the ratio of 1-4:1 in parts by weight, and obtaining solution A; (2) weighing soluble antimony salt and tin salt, adding into the solution A, dissolving and obtaining a homogeneous system B, wherein, the ratio of Sb<3+>: Sn<4+> by molar fraction is 1-15:100, and the ratio of tin salt: solution A in parts by weight is 1-25:100; (3) adding water solution of peroxide initiator with weight content of 2-10% into the homogeneous system B for obtaining solution C under the stirring condition; and (4) heating the solution C for 0.1-3h at the temperature of 60-100 DEG C, then drying at the temperature of 80-150 DEG C for obtaining solids, grinding after cooling, and calcining for 1-10h in an air atmosphere at the temperature of 450-900 DEG C. The method has simple process flow, and the prepared powder has even distribution of particle size and higher purity.

The invention discloses a method for titanium glycolate catalyzed synthesis of a modified copolyester slice. The method includes: subjecting terephthalic acid and diol in a mole ratio of 1:1.2-2.0, a titanium glycolate catalyst and a cobalt compound to esterification, subjecting the esterification product to polycondensation with blue dye, red dye, an organic compound stabilizer of phosphorus and a small amount of ethylene glycol, then utilizing nitrogen to extrude a melt, and performing casting strip dicing to obtain a modified copolyester slice, wherein the titanium glycolate catalyst is obtained by under the protection of nitrogen, mixing tetrabutyl titanate with ethylene glycol to form a clarified solution, performing heating to 160DEG C, carrying out reaction for 9h, distilling off and collecting the reaction generated n-butanol, cooling the reaction solution to room temperature, conducting filtering and collecting solid, washing the solid with acetone repeatedly, and carrying out drying. The method accelerates the polymerization reaction, and the synthesis process of titanium glycolate does not generate hydrogen chloride or other toxic gases, the process is simple and is convenient for industrialization, and the prepared copolyester slice has neutral tone.

The invention relates to a caliper type chromium complex and a preparation method and application thereof, and belongs to the technical field of catalysts. The caliper type chromium complex is a [NCN]-ligand-based caliper type chromium complex. The preparation method comprises the following steps of: adding hexane solution of butyl lithium into tetrahydrofuran solution of a ligand dropwise for reaction; adding a tetrahydrofuran adduct of chromium trichloride or chromium dichloride; and heating the mixture to room temperature naturally and reacting to obtain the caliper type chromium complex. The ligand can be 2,6-bis(N-2,6- phenyl)imido bromobenzene. The caliper type chromium complex, alkyl aluminum and organic boron salt serving as catalysts are used for catalyzing selective polymerization of isoprene or butadiene. The caliper type chromium complex has high stability and is convenient to prepare; the catalytic system can be used for selectively catalyzing polymerization of the isoprene or the butadiene, and has low using amount of a cocatalyst, high polymerization speed, high conversion rate and high anti-1,4 selectivity; and the caliper type chromium complex can be applied actually by replacing natural trans-1,4 rubber.

The invention relates to a method for preparing polyester fibers with ultraviolet-resistant and anti-pilling composite function. The method comprises an esterification reaction procedure, a polymerization reaction procedure and a spinning procedure, wherein the esterification reaction procedure comprises a primary esterification reaction stage and a secondary esterification reaction stage, and aliphatic dicarboxylic acid or non-p-aryl dicarboxylic acid serving as a third monomer is introduced in the primary esterification reaction stage; flexible polyethylene glycol serving as a fourth monomer is introduced in the secondary esterification reaction stage; a hindered amine light stabilizer and a hindered phenol antioxidant which are respectively prepared by using acetic acid and ethylene glycol as solvents and hydroxy silicone oil are added after the esterification is completed; and after the pre-polymerization of the polymerization reaction procedure is completed and before final polymerization, an ultraviolet absorbent is added. Before the spinning procedure, polyester slices are pre-crystallized and dried. The polyester fibers obtained by the method have excellent ultraviolet-resistant and anti-pilling function; and after the polyester fibers are woven into knitted fabrics and woven fabrics, tests show the related technical indexes that: the ultraviolet transmission rate is less than or equal to 5.0 percent, and the anti-pilling performance is more than or equal to level 4.

The invention relates to a rare earth alkyl coordination compound for configuration maintenance of catalytic levorotatory lactide and ring-opening polymerization as well as a preparation method and a use method thereof. The rare earth alkyl coordination compound can be used for initiating levorotatory lactide to carry out configuration maintenance and ring-opening polymerization of a solution, has high activity and can use tetrahydrofuran, methylene chloride or toluene as an organic solvent. In a tetrahydrofuran solution, a levorotatory lactide ring-opening polymerization reaction is carried out at 20-70 DEG C, and the monomer conversion rate reaches 100% after the reaction is carried out for 0.1-5 hours; in a toluene solvent, the levorotatory lactide ring-opening polymerization reaction is carried out at 20-100 DEG C, and the monomer conversion rate reaches 100% after the reaction is carried out for 0.1-5 hours. The molecular weight of a product is controlled by the mol ratio of a monomer and an initiator, the activity of the lactide polymerization reaction is influenced by the space effect and the electronic effect of a catalyst, the solvent, the temperature and the actualizing method of the polymerization reaction and the like, and the configuration maintenance of the poly-levorotatory lactide is obtained.

The invention relates to a polymerization method of perylene diimide fluorochrome. An amphiphilic compound containing perylene diimide fluorophores and a tertiary amine structure is synthesized, whichcan be used as an initiator for free radical polymerization; tertiary amine can be subjected to a redox reaction with potassium persulfate at the normal temperature to generate active free radicals multiple times, both oil-soluble monomer methyl acrylate polymerization and water-soluble monomer vinylpyrrolidone polymerization can be initiated on a water/oil interface, and then the the purpose ofpolymerizing the perylene diimide fluorochrome is achieved. By means of the mode, the functionalization and the polymerization reaction do not interfere with each other, the degree of freedom of operation is high, more kinds of products are obtained, the polymerization reaction conditions are mild, neither organic solvent nor emulsifier is needed, and the method meets the requirements of green chemistry.

The invention provides a method to produce bio-diesel and dimerized acid ester from combination of animal and plant lipids. Esterification is performed between animal/plant lipids and a lower alcohol containing 1-4 carbons, the product of esterification is separated into saturated and un-saturated lipid acids through urea inclusion. The condition of urea inclusion includes the ratio of lipid acid esters: urea: solvent (w/w/w) is 1: (0.6-4): (2-10), with the temperature of 0-25 DEG C and the time of 5-30 hours. The unsaturated lipid acids react for 1-12 hours under 150-300 DEG C with the presence of an acid catalyst, and the product undergoes vacuum distillation to obtain monomer lipid acid ester and dimerized acid ester. The combination of the monomer lipid ester and the saturated lipid acid ester obtained through urea inclusion is the bio-diesel. The invention increases the reaction speed, shortens the reaction time, and improves the quality of the product of dimerized lipid acid ester, because a great deal of saturated lipid acid ester does not participate in the polymerization reaction.

The invention discloses a method for preparing a water-soluble polymer by auto-deposition polymerization initiated by ultraviolet light, belonging to the technical field of aqueous dispersion polymerization. The method comprises the following steps of: firstly, preparing reaction liquid: proportionally mixing a photoinitiator, a water-soluble monomer and a solvent in a straight tube glass reaction flask to prepare the reaction liquid, and introducing nitrogen for removing oxygen for 20-40 minutes, wherein the concentration of the photoinitiator in the reaction liquid is 0.1-10mmol/L, and the concentration of the monomer in the reaction liquid is 0.5-6mmol/L; and then, carrying out illumination reaction: putting the reaction flask containing the reaction liquid below an ultraviolet lamp for irradiating for 10-120 minutes. According to the invention, polymers formed in the reaction process are continuously precipitated out, gathered and deposited at the bottom of the reactor, so that the light shielding effect is relieved or eliminated; and meanwhile, the supernatant liquid can be recycled, so that the reaction efficiency is high, and the method is economic and rapid. Through simple decantation, a product can be separated, the method is simple and convenient, and the product is pure and can be dried easily, thereby being favorable for subsequent applications.