1143results about How to "The synthesis process is simple" patented technology

The invention relates to self-healing polyurethane resin containing disulfide bond and a preparation method thereof. The polyurethane resin comprises, by weight parts, 10-30 parts of polyether or polyester polyol, 3-20 parts of polyisocyanates, 1-10 parts of chain extender containing the disulfide bond, 0.001-1 part of organic tin or tertiary amine catalyst and 50-80 parts of organic solvent. The method for preparing the self-healing polyurethane resin containing the disulfide bond comprises the steps of weighing raw materials, stirring, heating and performing dehydration for the polyether or polyester polyol under vacuum conditions, lowering the temperature to 85 DEG C or below, adding the polyisocyanates and the organic tin or tertiary amine catalyst, reacting, lowering the temperature to 50 DEG C or below, adding the organic solvent and the chain extender containing the disulfide bond, reacting and performing vacuum defoamation to obtain the self-healing polyurethane resin. The self-healing polyurethane resin heals by itself under the heating or ultraviolet (UV) light conditions, the required conditions are mild, the healing speed is high, the effect is good, the preparation method is simple and easy to control, and raw materials are goods of commercialized production and are cheap and easy to obtain.

The invention discloses a method for preparing a cathode material of a sodium-ion battery, namely sodium vanadium fluorophosphates. The method comprises the following steps: using a vanadium source, a phosphorus source and a carbon source as main synthetic raw materials; dissolving into deionized water according to the molar ratio 1:1:1.2 of vanadium: phosphorus: carbon, heating in water bath, and continuously stirring to obtain light green pulp; after vacuum drying, grinding, then transferring into a tube furnace, preburning in an inert atmosphere at a certain temperature rise rate, cooling and then taking out to obtain black VPO4/C precursor powder; mixing the VPO4/C with NaF according to a stoichiometric ratio, ball-milling for 3 hours, sending into the tube furnace, then roasting in the inert atmosphere at the certain temperature rise rate, and cooling along with the furnace to obtain a positive active material NaVPO4F/C. According to the invention, cheap and easily-obtained pentavalent vanadium oxide or trivalent vanadium oxide is used as the main raw materials to prepare the sodium vanadium fluorophosphates cathode material through a sol gel activated auxiliary two-step high-temperature solid phase method, and the sodium vanadium fluorophosphates cathode material has the advantages of good stability, uniform particle size and good electrochemical performance. Meanwhile, the method has the advantages of simple synthesis process, short period and low cost and is convenient for large-scale production.

The invention belongs to the technical field of organic luminescence materials. The gathering luminescence material of the invention contains a triphenyl thylene structure, ketone carbonyl is converted into double bonds by substituent phenyl ketone through a Wittig reaction or a Wittig-Horner reaction during synthesis, and the triphenyl thylene structure is formed and then is connected with otheraromatic base groups. The synthesis method has simple technique and easy purification, and the synthesized organic luminescence material containing the triphenyl thylene structure not only has obvious gathering induced luminescence performance, high thermal stability, high vitrifaction transformation temperature and high luminescence intensity, but also is suitable for preparing a luminescence layer material in an organic electroluminescence material component; by introducing proper base groups, and the organic luminescence material also can be used as a fluorescent probe and organic solar battery sensitizing dyestuff.

The invention discloses a sugar-based quaternary ammonium salt gemini surfactant, which has a general structural formula, wherein a sugar base is a glucose base; R is the long-chain alkyl of C8 to C18; X is chlorine, bromine or iodine; m is equal to 1 to 2; and n is equal to 1 to 2. A synthesis method for the surfactant is simple, comprises the steps of directly synthesizing dihalogenated glycoside and performing quaternization reaction, ensures simple synthesis process and low requirements on equipment and is suitable for industrialization. A sugar-based quaternary ammonium salt structurally has nonionic glucose hydrophilic groups and cationic bisquaternary ammonium salt hydrophilic groups. The product has the bactericidal property, antistatic behavior and hard water resistance of a cationic surfactant, relatively lower irritation, and the high performance of a gemini surfactant as the gemini surfactant, can be compounded with an anionic surfactant to realize synergism, is a multifunctional surfactant, can be widely applied to the industries of textile, papermaking, cosmetics, mining and the like, and has potential application prospect.

The invention discloses a solid phase method for synthesizing an anode material of a composite silicate (Li2-yMyFexMn1-xSiO4/C, wherein 0<=x<=1, 0<=y<=0.02, and M is one or a plurality of transition state elements of IB-VIIIB) series, and an anode material of the composite silicate. Organic carbon source is added in iron source, manganese source, lithium source, silicon source and organic carbon source doped with metal compound for dispersing and ball milling for a plurality of hours, and the mixture is dried by spray, protected in a vacuum environment or by introduced non-oxide gas and sintered at the temperature of 600 to 950 DEG C for 5 to 24 hours, thus the anode material of the composite silicate with good electrochemical performance is obtained. The preparation method of the anode material has high technical adaptability and is easy to realize industrial production; and the product has extremely good electrochemical performance.

The invention relates to a process for synthesizing unsaturated polyester resin with renewable vegetable fat, which comprises generating acid ester through conducting alcoholysis reaction for vegetable oil and organic polyatomic alcohol, using as modified dihydric alcohol and being leading to the typical synthesis formulation of unsaturated polyester resin, completely replacing conventional dihydric alcohol, using for synthesizing unsaturated polyester, and then mixing with cross-linking monomer. The resin which is synthesized has excellent hue, appropriate viscosity, excellent heat stability, favorable alkali resistivity, wonderful flexible property and low shrinking rate, which is suitable for various composite material shaping technology such as hand lay-up, winding and spraying and the like. Renewable raw material of vegetable oil with cheap price is applied in the synthesis process of the invention, and the stability of product is excellent.

An efficient hyperbranched polyphosphazene flame retardant charring agent is prepared by reacting hexachlorocyclotriphosphazene with a binary compound containing two active groups. The charring agent has characteristics of good foaming charring performance, excellent flame retardant effects and good processing performance, and can be widely used in plastics, rubber, coating, adhesives, and other polymer materials. A preparing method adopts a one-pot method, and has characteristics of continuous reaction process, short reaction time and high production efficiency. By controlling the mole ratio of the hexachlorocyclotriphosphazene to the binary compound, no end-capping agent is added in the reaction process. When compared with the addition of end-capping agents in synthesis processes in triazine type charring agent patents, the synthetic process of the charring agent is simplified.

The invention relates to a phosphoric polyester fire-retardant epoxy resin composition. The compositions by mass portion of the phosphoric polyester fire-retardant epoxy resin composition are: 20 to 40 portions of epoxy resin, 5 to 20 portions of phosphoric polyester, 0 to 10 portions of other curing agent, 0.1 to 0.3 portion of curing accelerator and 30 to 70 portions of inorganic filler. The phosphoric polyester fire-retardant epoxy resin composition does not contain harmful substances such as halogen, antimony trioxide and so on; the fire resistance can reach the fire-retardant standard of UL94 V-0; and the phosphoric polyester fire-retardant epoxy resin composition has good fire resistance and electric property.

The invention provides a slump loss resistant type gather carboxylate water-reducing agent, which is a polymer of prenyl polyoxyethylene ether or prenyl polyoxyethylene propenyl ether or methyl allyl polyoxyethylene ether or methallyl polyoxyethylene propenyl ether (a macro-monomer A) and unsaturated carboxylic acid (a micro-monomer B) and an unsaturated carboxylic acid derivative (a micro-monomer C), belonging to the field of concrete admixtures. A synthetic method is as follows: the water-reducing agent is prepared by initiating the macro-monomer A, the micro-monomer B and the micro-monomer C through an oxidative-reductive initiating system by taking water as a solvent at lower temperature, and carrying out copolymerization under the action of a chain transfer agent. The water-reducing agent overcomes the disadvantages of being poor in slump loss resistance, long in setting time and the like of the water-reducing agent synthesized by allyl polyoxyethylene ether and has the advantages of being high in slump loss resistance, good for being suitable to different cements and low in influence on concrete setting time.

The invention belongs to the technical field of organic light emitting materials, and discloses an aggregation-induced light emitting material simultaneously containing a triphenylethylene structure and a tetraphenylethylene structure. During synthesis, a triphenylethylene intermediate containing a functional group and a tetraphenylethylene intermediate containing a functional group are connected together by coupling reaction. A synthesis method of the invention has the advantages of simple process and convenient purification; and the synthesized organic light emitting material simultaneously containing the triphenylethylene structure and the tetraphenylethylene structure has the advantages of obvious aggregation-induced light emitting performance, high thermal stability, high glass-transition temperature and high luminous intensity and is suitable for preparing a light emitting layer material in an organic electroluminescent material device.

The present invention provides a preparation of a chitosan compound adsorbent for absorbing magnetic powder heavy metal ion imprint. The chitosan is employed as a imprinting matrix material, the nanometer magnetic powder Fe3O4 is employed as a magnetic component, the epichlorohydrin is employed as a crosslinking agent, the sodium tripolyphosphate is employed as a curing agent, after steps of ion imprinting, magnetic powder embedding and curing and template ion eliminating, the magnetic metal ion imprinting chitosan compound adsorbent is obtained. The compound absorbent prepared by the present invention can be separated from the solution after absorption efficiently and rapidly under the external magnetic field to realize the rapid efficient reclaim of the adsorbent. The compound absorbent has high mechanical strength and selective absorbability of imprint Cr(VI) or Zn (II), avoids the swelling loss of the chitosan in acidity solution and improves the absorption capacity of Cr(VI) or Zn (II). The preparation of the present invention has simple reaction conditions and has no rigorous limit of the experiment conditions. The preparation of the present invention can be used to process the heavy metal waste water containing Cr(VI) or Zn (II), also reclaim Cr(VI) or Zn (II).

The invention discloses a fiber-reinforced flexible SiO2 aerogel heat-insulation material and a preparation method thereof. Silicon-containing substances such as tetraethyl orthosilicate, tetramethoxysilane, sodium silicate and the like are used as precursors, a fiber felt pad is used as a reinforcing body, fiber/SiO2 composite wet gel is prepared with a sol-gel technology, and the fiber-reinforced flexible SiO2 aerogel heat-insulation material is finally prepared through aging and supercritical drying. The synthesis process is simplified, the preparation cycle is shortened, the cost for synthesis of the SiO2 aerogel composite material is effectively reduced, defects of poor mechanical strength, large brittleness and the like of pure aerogel are overcome, the prepared composite aerogel keeps the excellent performance of the aerogel, the flexibility of the material is obviously improved, the material is better in integrity, capable of being bent at will and very good in heat-insulation effect, the heat conductivity of the material can be decreased to 19 mW/mK, the application range of the aerogel is enlarged, and the material can be applied to actual engineering as an independent bulk composite material.

The invention discloses a new kind of carborane- silane- phenylacetylene polymer and the method for preparing the same. Said polymer employs methylchlorosilane, phenylacetylene, carborane and organic lithium agent as raw material, anhydrous tetrahydrofuran (THF) as dissolvent and preparing with protection of nitrogen. The invention moderates molar ratio between simple function group ethynyl compound and carborane to easily control molecular weight of polymer, crosslinking density and carborane content, and realizes purpose of adjustable polymer property. The invention is characterized by simple process and easy operation. The prepared polymer forms thermostable thermosetting material with excellent thermal oxidation performance by heat, light and chemical initiation. Said thermosetting material can be produced to ceramic structure by heating on air or inactive gas. The polymer can be used as base resin and thermo-stable coating for advanced complex material and for preparing ceramic pioneer body.

The invention relates to a method for synthesizing mesoporous mordenite, which mainly solves the problems that precious materials are needed to serve as mesoporous templates, the synthesis process is complicated and the cost is high in the prior art for preparing mesoporous zeolite. The method comprises the following steps of: mixing a silicon source, an aluminum source, an organic amine structure directing agent (SDA), a polymer mesoporous template agent R and water, wherein in the mixture, the molar ratio of SiO2 to Al2O3 is 8-500, the molar ratio of H2O to SiO2 is 5-100, the molar ratio ofSDA to SiO2 is 0-0.5, and the weight ratio of the polymer mesoporous template agent R to SiO2 is 0.05-3; and crystallizing the mixture at the temperature of between 100 and 200DEG C for 1 to 10 days to obtain a crystallization product, and washing, drying and roasting the crystallization product to obtain the mesoporous mordenite, wherein the polymer mesoporous template agent R is at least one ofstarch, dextrin, cellulose, polyethylene glycol, polyvinyl alcohol, polyether, polyvinyl formal and polyvinyl butyral. The technical scheme well solves the problems. The synthesized mesoporous mordenite has a micropore-mesopore composite structure; the synthesis process is simple; the mesoporous mordenite with the composite hole structure can be synthesized at low cost, better technical effect isachieved, and the method can be used for industrial production of the mesoporous mordenite.

The invention relates to a method for manufacturing a biological detector of a field effect transistor based on a non-covalent modified single-walled carbon nano tube, which belongs to the technical fThe invention relates to a method for manufacturing a biological detector of a field effect transistor based on a non-covalent modified single-walled carbon nano tube, which belongs to the technical field of nano electronic device manufacture and biological analysis and detection. The method comprises the following steps: setting up the single-walled carbon nano tube (beam) between an interdigitalield of nano electronic device manufacture and biological analysis and detection. The method comprises the following steps: setting up the single-walled carbon nano tube (beam) between an interdigital source electrode and a drain electrode made on a silicon substrate of which the surface contains an insulating oxide according to a photoetching technique; constructing the field effect transistor basource electrode and a drain electrode made on a silicon substrate of which the surface contains an insulating oxide according to a photoetching technique; constructing the field effect transistor based on the carbon nano tube; and modifying a non-covalent glycosylation organism on the surface of the carbon nano tube to obtain a field effect transistor based on the carbon nano tube for the detectsed on the carbon nano tube; and modifying a non-covalent glycosylation organism on the surface of the carbon nano tube to obtain a field effect transistor based on the carbon nano tube for the detection of the recognition function of saccharide-protein specificity. The method can selectively modify different sugar molecules to detect specificity combining actions between different sugar ligands aion of the recognition function of saccharide-protein specificity. The method can selectively modify different sugar molecules to detect specificity combining actions between different sugar ligands and receptors so as to form the universal, flexible and efficient biological detector of the field effect transistor based on the carbon nano tube.nd receptors so as to form the universal, flexible and efficient biological detector of the field effect transistor based on the carbon nano tube.

The invention relates to ultraviolet light curable high-strength polyurethane acrylate resin and a preparation method thereof. The resin is composed of the following components: 50-80 wt% of polyurethane acrylate and 20-50 wt% of a reactive diluent, wherein the polyurethane acrylate is composed of the following materials: 32-50 wt% of diisocyanate, 19-29 wt% of hydroxyacrylate, 22-49 wt% of a polyester polyol, 0.05-0.3 wt% of a catalyst, and 0.02-0.05 wt% of a polymerization inhibitor; and the method comprises the following steps: 1, mixing the diisocyanate (-NCO: 2 mol), the catalyst, the polymerization inhibitor and the hydroxyacrylate (-OH: 1 mol), and performing a reaction for 2-5 h at the temperature of 45-65 DEG C to obtain a first step product; 2, adding the polyester polyol (-OH: 1mol), and performing a reaction for 1-4 h at the temperature of 65-85 DEG C to obtain polyurethane acrylate (PUA); and 3, adding the reactive diluent to obtain the PUA resin. The method provided by the invention adopts the aromatic polyester polyol to improve the number of double bonds and structural rigidity of the PUA resin, so that the PUA resin can be rapidly cured and has high strength and high modulus; and the resin can be cured by ultraviolet light and heat, and has broad application prospects in the fields of composite material resin matrix, coatings, adhesives and structural adhesives.

The invention discloses a process for reserve recycling and preparation of lithium nickel cobaltate from a waste lithium battery as a raw material, and belongs to the field of waste lithium battery recycling. According to the process disclosed by the invention, an anode material of the waste lithium ion battery is recycled, a new lithium nickel cobaltate anode material is synthesized by means of a reserve recycling process, the regenerated anode material meets the performance requirements for native products, and resource utilization is achieved; the prepared primary product of lithium nickel cobaltate is treated by using a reducing metal powder so that the obtained lithium nickel cobaltate has oxygen vacancy; LiNixCo1-xO2-y is obtained, wherein x is not less than 0.33 and not more than 0.67, and y is not less than 0.05 and not more than 0.5; the oxygen vacancy can be used for enhancing the migration capacity of lithium ions in the lithium nickel cobaltate crystal structure and enhancing the discharge capacity of the battery. The reducing metal powder adopted by the process disclosed by the invention has the advantages that the synthesis process can be simplified and the cost for preparing the oxygen vacancy can be reduced.

The invention provides a 3-methylamine tetrahydrofuran preparation method, wherein 1,4-butenediol is adopted as a raw material and is subjected to cyclization dehydration under the catalysis effect of a solid acid to produce 2,5-dihydrofuran, the 2,5-dihydrofuran reacts with water gas under the catalysis effect of cobalt acetate to produce 3-tetrahydrofuran formaldehyde, and the 3-tetrahydrofuran formaldehyde, ammonia gas and hydrogen gas are subjected to a hydrogenation reaction under the catalysis effect of 5% Pd/C to prepare the target product3-methylamine tetrahydrofuran, wherein the purity is 98.12%, and the total yield is 74.16%. According to the present invention, the preparation method has advantages of cheap and easily available raw materials, less steps, simple operation, high product purity, high yield, less three-waste pollution and production cost reducing, and is suitable for industrial production.

The invention discloses a spherical mesoporous carbon nitride photocatalyst with a multistage nano structure and a preparation method and application thereof and belongs to the technical field of material preparation and photocatalysis. The spherical mesoporous carbon nitride photocatalyst with the multistage nano structure is prepared by using cyanamide as a precursor, using spherical mesoporous silicon dioxide with a highly open structure as a hard template, carrying out thermal thermal polymerization and removing the hard template. The spherical mesoporous carbon nitride prepared by the preparation method has the characteristic that nanosheet or nanosheet-like small particles are uniformly diffused around from the sphere center to form a spherical micro nano structure of which the surface structure is highly open; compared with conventional bulk phase carbon nitride, the spherical mesoporous carbon nitride photocatalyst can obviously improve the specific surface area and the mass transfer effect and has efficient photocatalytic hydrogen production performance in the visible light. The spherical mesoporous carbon nitride photocatalyst adopts a simple synthetic process, has high catalysis efficiency and has wide application prospect in the field of catalysis/photocatalysis.

The invention discloses a flame retardant containing phosphorus, nitrogen and sulfur and used for epoxy resin and a preparation method of the flame retardant. Firstly, DOPO and aminothiazole are taken as reaction raw materials and subjected to an Atherton-Todd reaction for preparation of the flame retardant containing phosphorus, nitrogen and sulfur. The process steps of the method are simple, the yield and the purity of the flame retardant are high, and the post-treatment process is simple and convenient. The flame retardant containing phosphorus, nitrogen and sulfur and prepared with the method is used for modifying cured epoxy resin and has good compatibility with epoxy resin, and the obtained cured flame-retardant epoxy resin has excellent flame retardancy; when the phosphorus content of the epoxy curing system reaches 0.43wt%-1.23wt%, the vertical burning grade can pass UL-94 V-0 level, and the limit oxygen index is as high as 36%.

The invention provides a carbon-coated Li3VO4 lithium ion battery anode material. The anode material is prepared according to the following method: employing vanadium pentoxide, lithium carbonate and hexamethylene tetramine as raw materials, performing a hydrothermal reaction to obtain an intermediate-phase solution, then adding citric acid into the intermediate-phase solution, mixing uniformly, and drying to obtain a solid product, and sintering the solid product in a high-temperature atmosphere, so as to obtain the lithium ion battery anode material with the Li3VO4 surface coated by amorphous carbon. The anode material is granular, and has the particle size of 90-120 nm. The carbonization effect of citric acid is utilized for fining Li3VO4 particles and uniformly coating the particle size with a carbon layer. The synthetic technology simple and easy to operate, and the material preparation cost is low. The prepared sample Li3VO4 is a uniform nano-particle, and has the dimension of 90-120 nm. In the obtained sample, the Li3VO4 particle surface is uniformly coated by amorphous carbon. The prepared material is high in charge/discharge capacity and excellent in cycle performance.

The invention provides mesoporous silica and a preparation method thereof. A sol-gel method is adopted, and the preparation method comprises the steps of adding a template agent into deionized water, then mixing with an ammonia water-water-ethanol solution, adding tetraethyl orthosilicate, stirring for fully reacting, aging, drying, and performing treatment by a muffle furnace to obtain mesoporous silica nanospheres. The method has the advantages of simple synthesis process, easiness in operation and low cost, and the prepared mesoporous silica nanospheres have the advantages of monodispersity, controllable morphology and high specific surface area of 1110.69m<2>/g.

The invention relates to a high-efficiency Fenton magnetic catalyst based on clay minerals and a preparation method and an application thereof. The preparation method comprises the preparation steps: (1) putting clean clay minerals into a pre-prepared ferric salt solution, heating the suspension after mixing to 60-100 DEG C, and continuously stirring for 0.5-5 h to reach stable; (2) adding an alkali liquor into the suspension, making the pH value of the solution rise to 8-11, continuously stirring for 0.5-6 h, and carrying out washing, drying and other processes of a solid precipitate to obtain a precursor powder; and (3) impregnating the precursor powder in a solution containing other non-ferrous metal salts, uniformly drying by distillation, carrying out heat treatment, and thus obtaining the high-efficiency Fenton magnetic catalyst based on the clay minerals. Compared with the prior art, the catalyst has magnetic separation performance, can be recycled and reused, and also has high-efficiency Fenton catalytic activity and stability in a near neutral pH value. The catalyst has the advantages of simple preparation process, relatively low cost and good ecological compatibility, and has wide application prospects in the field of treatment of difficult-to-degrade toxic organic pollutants.

The invention discloses an oil solubility compound-type suspended bed hydrocracking catalyst, wherein the catalyst is prepared by the following steps: 1) enabling compounds of metal elements in the VIB family, the VIIB family or the VIII family in a periodic table of elements as metal sources with alkali metal sulfide or alkali metal hydrosulfide according to the mole ratio of (0.5 to 1)-(2 to 1), thereby obtaining a metal element compound at a reduction state; 2) adding the metal element compound at the reduction state and amine substances into a reaction medium according to the mole ratio of (1:0.6)-(1 to 2), and meanwhile dropwise adding carbon disulfide with the corresponding quantity into the reaction medium according to the mole ratio of (1 to 1)-(2 to1) with the metal element compound at the reduction state, warming to react at the reaction temperature of 30-110 DEG C for 2-10 hours; 3) filtering and washing the product obtained by the step 2) so as to obtain the oil solubility compound-type suspended bed hydrocracking catalyst. The catalyst prepared by the invention can inhibit the coke yield, and improve the light oil yield.

The invention discloses a preparation method for perylene bisimide polyurethane liquid crystal non-covalent modified graphene. The preparation method comprises the following steps: adding perylene and zinc acetate into N-methyl pyrrolidone, stirring and heating to 150-160 DEG C, adding diglycolamine, reacting for 12 hours, pouring into absolute ethyl alcohol for precipitating and discharging, filtering, and drying in vacuum to obtain hydroxyl-terminated perylene bisimide; taking and dissolving the hydroxyl-terminated perylene bisimide into N, N-dimethyl formamide, adding hexamethylene diisocyanate and a catalyst, heating to 60-65 DEG C and reacting for 6 hours under protection of N2, adding polyethylene glycol, heating to 90-95 DEG C and reacting for 8 hours, pouring reaction liquid into distilled water for precipitating and discharging, filtering, and drying in vacuum to obtain perylene bisimide polyurethane liquid crystals; and taking and dissolving the perylene bisimide polyurethane liquid crystals into chloroform, adding graphene, ultrasonically treating for 2-3 hours, carrying out suction filtration, washing by chloroform, and drying in vacuum to obtain the perylene bisimide polyurethane liquid crystal non-covalent modified graphene. The method disclosed by the invention has the advantages of being wide in material source, simple in process, low in price, small in pollution and the like.

The invention provides a halogen-free expansion type flame retardant containing large molecular triazine char-forming agent, and a preparation method thereof; the expansion type flame retardant consists of large molecular triazine char-forming agent, epoxy resin cladding ammonium polyphosphate and auxiliary agent; the large molecular triazine char-forming agent is the reaction product of cyanuric chloride and diamine. The preparation of the flame retardant comprises the steps as follows: synthesis of the large molecular triazine char-forming agent, preparation of the flame retardant, and the like. The large molecular triazine char-forming agent has high yield and thermal-stability, continuous reaction process, simple synthesis process, convenient recovery of the solvent; furthermore, the prepared flame retardant has high polymer flame retardance, good mechanical performance, strong humidity resistance, low smoke, no toxin, and the like, and meets the requirement of environmental protection.

The invention provides a prenyl polyether polycarboxylate water reducing agent which is a polymer of prenyl polyoxyethylene ether or prenyl polyoxyethylene propylene ether (big monomer A) and unsaturated carboxylic acid and derivatives thereof (small monomer B), belonging to the field of concrete additives. A synthesis method of the water reducing agent comprises the following steps of: with water as a solvent, initiating the big monomer A and the small monomer B by adopting a redox initiation system under the lower temperature, and carrying out copolymerization under the action of a chain transfer agent to obtain the finished product. The water reducing agent overcomes the defects of low water reducing rate, poor slump loss resistance, long condensation time, and the like of a water reducing agent synthesized by allyl polyoxyethylene ether and has the advantages of high slump loss resistance, plenty water reducing and small influence on the condensation time of concrete.

The invention discloses a preparation method of a large-sized perovskite structure CH3NH3PbI3 crystal. The method comprises the following steps: dissolving PbI2 into an HI (Hydrogen Iodide) solution, and preparing a Pb<2+>-HI solution; mixing the HI solution with a CH3NH2 solution in the molar ratio of 1:1, and reacting the mixture at the temperature of 0 DEG C for 2 hours to obtain a CH3NH2I solution; mixing the Pb<2+>-HI solution with the CH3NH2I solution, preheating at the temperature of 95 DEG C for 48-72 hours to obtain an oversaturated solution, and filtering the oversaturated solution to obtain a mother liquor for growing the CH3NH3PbI3 crystal, wherein the molar ratio of CH3NH2I to Pb<2+> is (1-2):1; and preheating the mother liquor in a water bath of 95.5-96 DEG C for 12-24 hours, placing the preheated mother liquor into a crystal growing container, performing programmed cooling to 45 DEG C, and keeping a constant temperature to obtain the CH3NH3PbI3 crystal. In a process of the method, the HI solution participates in the synthesis of raw materials, and is taken as a solvent of crystal growing, so that the method has the advantages of simple synthesizing process and small number of side reactions; and a growing device is simple, and a high-quality and large-sized crystal can be grown.

The invention discloses a block polymer dispersant and a preparation method thereof. The structure of the block polymer dispersant is shown in the following formula (I). The invention also discloses a synthesis method for preparing the block type polymer dispersant by single electron transfer/living radical polymerization. The invention has the following advantages: 1) the block type polymer dispersant prepared by the single electron transfer/living radical polymerization is light in color and nearly colorless, can be directly for use, and has a simple synthesis process; 2) the block type polymer dispersant can quickly humidify the pigment particles and shorten the milling time; 3) the steric effect of the polyitaconate deflocculates the pigment particles, and can prevent the pigment from flocculating and precipitating in the storage process; and 4) the deflocculated pigment particles are small, thereby achieving high glaze and color intensity, and increasing transparency and hiding power.

The invention provides a high density spherical shape Co3O4 and a preparation method thereof, and relates to a Co3O4, in particular to the preparation of the high density spherical shape Co3O4, which is mainly used for preparing lithium cobaltoxide of anode material of a lithium ion battery, and also is used as Co3O4 of electronic grade, and belongs to the products of chemical industry. The invention provides a preparation method of the high density spherical shape Co3O4 with good fluidity, the prepared Co3O4 is enabled to be a spherical shape particle which has best stacking density and can effectively improve the tap density of the particle, thereby improving the electrochemistry property of the lithium ion battery and the quality of the lithium ion battery. The Co3O4 prepared by the method is a spherical shape crystal, the mean grain size is 5-25 micrometers, the loose packed density is more than or equal to 1.0g/cm<3>, the tap density is more than or equal to 2.0g/cm<3>, and the cobalt content is more than or equal to 73 percent. The process of the method is simple, and the lithium cobaltoxide synthesized by the Co3O4 presents better property, compared with the past Co3O4, the electrochemistry property of the lithium ion battery can be improved.