35results about How to "Control aggregation" patented technology

The invention discloses a method for synthesizing polycarboxylate superplasticizer through a RAFT method. According to the method, firstly, macro-monomers A are added into a reaction kettle, water is added, water bath heating is performed till the temperature is 65-85 DEG C, and constant-temperature stirring is performed; then, a trithio ester chain transferring agent is dissolved in a mixed solution of micro-monomers B and water, the mixture is dropwise added into the reaction kettle at constant speed, and meanwhile an initiator aqueous solution is dropwise added; after all the needed matter is dropwise added, a stirring reaction lasts for 3-5 h under the continuous constant-temperature stirring condition of 65-85 DEG C; after the reaction ends, an alkali solution and water are added to adjust PH to 6-7, and the polycarboxylate superplasticizer is obtained after reaction products are cooled to room temperature. By means of the method, the molecular-structure-controllable polycarboxylate superplasticizer can be prepared, the molecular weight is controllable, the molecular weight distribution range is narrow, polymer molecule design can also be performed, and the method has great significance in research and development of the polycarboxylate superplasticizer synthetic technology.

The invention discloses an arid region heavily-salted original soil afforesting method. The arid region heavily-salted original soil afforesting method includes the steps that sand doping is firstly carried out to improve the physical structure of soil in a planting area, annual growth halophyte is planted in the first year to achieve afforesting and soil partial desalting, ridging is carried out in the second year to construct furrow terrains, tamarix chinensis, amorpha fruticosa and sweet clover which are resistant to salt are planted on ridges in a trickle irrigation mode to achieve biological salt moving and soil fertilizing, and suaeda salsa is planted in furrows in a trickle irrigation mode to increase the earth surface cover degree, improve physical-chemical properties of soil and desalt the soil. By means of the arid region heavily-salted original soil afforesting method, the physical improvement and the biological improvement of the salted soil are integrated, the technical measures of furrow cultivation and water saving trickle irrigation are combined, the arid region heavily-salted original soil afforesting method is easy and convenient to operate and low in cost, and the stability and the sustainability of the heavily-salted original soil afforesting are achieved.

The invention discloses an immersion control device used for a photoetching machine; a circular flow field cushion chamber, a sealing structure and a drying cavity are arranged from an injection cavity and a recovery cavity outwards in sequence; the flow field cushion chamber can carry out compensation to an exposure flow field in real time so as to reduce the occurrence probability and intensity of liquid backflow; the sealing structure adopts a combination mode of surface characteristic processing of hydrophilic and hydrophobic and the structure design of a tension groove; the section of the tension groove is a triangle inclined outwards in the direction vertical to a substrate; liquid which is drawn to move by the substrate forms backflow so as to restrain the liquid leakage; the drying cavity is filled with matters with super absorbent and communicated with negative pressure, and discharges possible residue of droplets in real time; simultaneously, the mode of conveying the liquid adopts positive pressure to feed the liquid and free flowing of recovery side, thus avoiding fluctuation of flow field caused by the incoordination of liquid injection and recovery pressure.

The invention discloses a preparation method of cerium oxide microspheres, which comprises the following steps: preparing spherical cerous carbonate by a vapor phase diffusion process by using polyelectrolyte as a shape control agent; and carrying out high-heat treatment to obtain the CeO2 microspheres with high specific area. The particle size of the CeO2 microspheres is 300-500nm, and the specific area reaches more than 110 m<2> / g after the CeO2 microspheres are roasted at 500 DEG C. The vapor phase diffusion process is utilized for the first time to prepare the cerium oxide microspheres, and the whole reaction process is carried out at room temperature, so that the invention has the advantages of mild reaction conditions and simple preparation method and is easy to control. The polyelectrolyte is used as the shape control agent for the first time to regulate the shape of the cerous carbonate, thereby regulating the shape of the cerium oxide. Cations and anions of the polyelectrolyte in the water solution can regulate the aggregation of ions and control the shape and size of the cerous carbonate, thereby controlling the shape and size of the cerium oxide. The cerium oxide with high specific area has important applications in catalytic materials of automobile exhaust catalytic purification, petroleum cracking, chemical engineering and the like.

The invention discloses a method for preparing particle-size-controllable type starch nanoparticles by an emulsifier assistant biological enzyme method, and is characterized in that the method specifically comprises the following steps: (1) preparation of a buffer solution; (2) debranching enzyme activation; (3) preparation of starch milk; (4) gelatinization (starch chain extension); (5) enzymolysis debranching; (6) short straight-chain solution separation; (7) enzyme deactivation; (8) addition of an emulsifier, and control of a crystallization process; (9) recrystallization; and (10) drying. The method disclosed by the invention has the advantages of low equipment requirement, simple technology, simple and convenient operation, moderate reaction, short reaction time, and high efficiency, and is suitable for large-scale production; and the product performance is good, the particle diameter of the prepared starch nanoparticles can be controlled to be 9-30 nm, the dispersion and thermal stability are good, the preparation cost is low, the energy consumption is low, no harmful waste is generated, and the method conforms to modern production requirements of environmentally-friendly production and energy conservation.

The invention provides a method for controlling the content of acetaldehyde in the synthesizing process of acetic acid by methanol carbonylation. The method comprises the steps: after flash evaporation of carbonylation materials, volatile phases are formed after the separation of a light component tower and condensed and separated to form 'light phases' and 'heavy phases', wherein, the 'light phases' are completely or partly led into a distillation tower for distillation, tower top distillates containing acetaldehyde and methyl iodide are obtained from the top of the tower, and tower bottom reflux substances containing methyl iodide, acetic acid and water are obtained form the bottom of the tower; and after condensation of the tower top distillates through a condenser, extraction is carried out by water, the extraction liquid containing acetaldehyde is discharged outside for independent treatment, and the faffinate and the tower bottom reflux substances are put back to a main reaction system to complete the procedures of follow-up processing with the left 'light phases'. The method can effectively control the content of acetaldehyde in the synthesizing process of the acetic acid by methanol carbonylation, reduce or remove compounds (PRC S) which deacidize hypermanganate, and reduce the loss of cocatalysts of methyl iodide and the like.

The invention relates to an environmentally-friendly organic nutritional health-care puerarin powder plant candy and a preparation method thereof, belongs to a nutritional health-care plant candy, and particularly relates to a nutritional health-care plant candy in which puerarin powder or fern root powder is taken as a principal raw material. The invention provides a plant candy which is rich in nutrient and has a health-care value. The plant candy is mainly prepared from the following raw materials in percentage by weight: 96%-20% of sugar raw materials and 4%-80% of puerarin powder or fern root powder, wherein the total weight percent of all components is 100%.

The invention discloses a method for preparing a silver-based inorganic antibacterial material. By modifying a methacrylamide graft knitted fabric by maleic anhydride, by virtue of double effects suchas adsorption and complexation of amino and double bond rich electrons on silver ions, adsorption of the silver ion is enhanced, and the loss of lots of nano-silver caused by washing of the knitted fabric is avoided. Moreover, by virtue of the reduction effect of the amino and double bond rich electrons on the silver ions, the negative ions are reduced into nano silver, the independent nano silver reduction step is reduced, and the efficiency is improved. Meanwhile, by virtue of the double effects such as adsorption and complexation of the amino and double bond rich electrons on silver ions,migration of the silver ion in the steaming reduction process is effectively controlled, gathering of the nano silver is effectively controlled, and the antibacterial effect is improved.

The invention relates to the field of solid waste resource utilization, and provides a production process for preparing an alkali cementing material from coal gangue, which comprises the following steps: (1) crushing, ball-milling and sieving coal gangue to obtain coal gangue powder; (2) putting the coal gangue powder into the mixed acid solution, uniformly stirring, standing for several days, carrying out suction filtration, and drying; (3) mixing the coal gangue powder obtained in the step (2) with salty mud, calcining at high temperature, cooling, carrying out secondary ball milling, and sieving to obtain mixed powder; (4) weighing the following raw materials in parts by weight: 50-80 parts of the mixed powder, 20-40 parts of slag powder, 4-8 parts of an exciting agent and 24-36 parts of water; (5) uniformly mixing the raw materials to obtain alkali gelling slurry; and (6) injecting the alkali gelling slurry into a mold, carrying out vibration molding, curing at normal temperature until demolding, and carrying out steam curing at 66-72 DEG C for 8 hours. According to the preparation method, the problems of resource waste and environmental pollution of the coal gangue waste are solved, and the alkali cementing material with excellent performance is prepared.

Disclosed is an investment casting mold cavity cleaning method based on selected area laser powder sintering rapid proto-typing technology application. According to the technical scheme, the top end of a wax mold and the secondary top end of the wax mold are connected with a residue discharging channel and a residue collecting device in a welded mode in a mold set assembling process. After a shell manufacturing process and a dewaxing process, flowing discharging of a wax mold in a liquid state and gathering of remained residues can be effectively controlled in a baking process, so that a clean mold cavity is obtained. After a series of well-known investment casting technology such as smelting, pouring, sand cleaning and piece dropping, an investment casting with a surface and an interior being good in quality is obtained.

The invention discloses a preparation method of cerium oxide microspheres, which comprises the following steps: preparing spherical cerous carbonate by a vapor phase diffusion process by using polyelectrolyte as a shape control agent; and carrying out high-heat treatment to obtain the CeO2 microspheres with high specific area. The particle size of the CeO2 microspheres is 300-500nm, and the specific area reaches more than 110 m<2> / g after the CeO2 microspheres are roasted at 500 DEG C. The vapor phase diffusion process is utilized for the first time to prepare the cerium oxide microspheres, and the whole reaction process is carried out at room temperature, so that the invention has the advantages of mild reaction conditions and simple preparation method and is easy to control. The polyelectrolyte is used as the shape control agent for the first time to regulate the shape of the cerous carbonate, thereby regulating the shape of the cerium oxide. Cations and anions of the polyelectrolyte in the water solution can regulate the aggregation of ions and control the shape and size of the cerous carbonate, thereby controlling the shape and size of the cerium oxide. The cerium oxide with high specific area has important applications in catalytic materials of automobile exhaust catalytic purification, petroleum cracking, chemical engineering and the like.

The invention belongs to the field of high polymer materials, and relates to low-molecular-weight polyurethane resin and an application thereof in tackifying resines. The low-molecular-weight polyurethane resin is prepared through the following steps: adding small-molecular-weight dihydric alcohol into a tank reactor, and heating, vacuumizing and dewatering under inert gas protection; and cooling the dehydrated dihydric alcohol material, adding diisocyanate for multiple times, adding the diisocyanate for the next time after the temperature is reduced to 70 DEG C or below after each time of addition, and continuing the reaction after the addition is finished to obtain the low-molecular-weight polyurethane resin. The molecular weight and the structure are adjustable, and the glass transition temperature can be selected as required. In addition, according to the low-molecular-weight polyurethane provided by the invention, cross-linking is greatly reduced by controlling a reaction process, so that the low-molecular-weight polyurethane is easily dispersed in polyol, a solvent and a polyurethane adhesive. In addition, the low-molecular-weight polyurethane provided by the invention contains active groups and can be chemically reacted with the adhesive, so that more excellent body strength of the adhesive is provided.

The invention provides a method for preparing 6-aminocapronitrile, which comprises the following steps: (1) respectively preheating caprolactam and ammonia gas, and introducing the preheated caprolactam and ammonia gas into a micro-channel reactor I for reaction to obtain 6-aminohexanamide; (2) carrying out gas-liquid separation on a material obtained after the reaction in the step (1) to obtain a liquid-phase material 6-aminohexanamide; and (3) preheating the 6-aminohexanamide separated in the step (2), introducing the preheated 6-aminohexanamide into a micro-channel reactor II, and simultaneously introducing a dehydrating agent to carry out a dehydration reaction, thereby obtaining the 6-aminocapronitrile. According to the method, polymerization of ammonolysis products is effectively controlled, generation of by-products is reduced, a dehydrating agent is used for a dehydration reaction under the catalyst-free condition, and the problems of catalyst coking, short catalyst service life and the like in a catalytic dehydration process are effectively avoided.

The invention provides a preparation method of nanometer hydroxyapatite powder. The preparation method comprises the following steps of (1) preparing a phosphate ion solution, and adjusting a pH value of the phosphate ion solution to be 10-12; (2) preparing a calcium ion solution, and adjusting a pH value of the calcium ion solution to be 10-12; (3) spraying the calcium ion solution into the phosphate ion solution, which is placed in an ultrasonic environment, at a certain flow rate after the calcium ion solution is atomized through ultrasonic atomizing, and then standing to obtain hydroxyapatite sediment; and (4) washing the hydroxyapatite sediment, and then conducting freeze drying to obtain the nanometer hydroxyapatite powder. According to the preparation method of the nanometer hydroxyapatite powder, an ultrasonic atomizing method in combination with a traditional ultrasonic method is used for synthesizing the nanometer hydroxyapatite powder which is small and uniform in particle size under conditions of a high concentration and room temperature.

The present invention discloses a propylene-to-acrylic acid oxidation absorption system and a method thereof. The system is characterized by comprising a propylene vaporization tower, a first oxidation reactor, a second oxidation reactor and a three-in-one tower, wherein the top portion of the propylene vaporization tower is provided with a mixing superheater, the top portion outlet of the mixing superheater, the top portion inlet of the oxidation reactor and the bottom portion outlet of the second oxidation reactor are sequentially connected in series with the lower end inlet of the three-in-one tower, a product steam generator is arranged between the second oxidation reactor and the three-in-one tower, and an upper portion washing water steam stripping section, a middle portion acrylic acid absorption section and a lower portion reactant cooling section are arranged inside the three-in-one tower. The system and the method have the following advantages that the finally obtained acrylic acid solution has characteristics of high concentration and low impurity content, and characteristics of safety, environmental protection, energy saving and effective oxidation catalyst protecting are provided.

The invention relates to a two-step preparation method of 6-aminocapronitrile. The two-step preparation method comprises the following steps: carrying out ammonolysis reaction on caprolactam in an inert solvent or in a molten state and hot ammonia gas to obtain 6-aminohexanamide, and dehydrating the 6-aminohexanamide in the presence of a dehydrating agent to obtain 6-aminocapronitrile. According to the invention, ring-opening ammonolysis is carried out under an anhydrous condition, so that polymerization of ammonolysis products is effectively controlled, and generation of by-products is reduced; and under the condition of no catalyst, the dehydrating agent is directly used for dehydration reaction, so that the problems of catalyst coking, short catalyst service life and the like in a catalytic dehydration process are effectively avoided.

The invention discloses a nitrogen-phosphorus co-doped metal-organic framework encapsulated platinum-cobalt-based alloy as well as a preparation method and application thereof, and belongs to the technical field of fuel cell nano-catalyst synthesis. The preparation method comprises the steps of dissolving a platinum precursor, a cobalt precursor and a doped metal precursor in isopropanol, and adjusting the pH value of the solution to be greater than 11; stirring in an environment with shielding gas at room temperature to obtain a metal salt mixed solution; dipping ZIF-67 into the metal salt mixed solution, sealing, carrying out ultrasonic treatment, standing, dispersing into a polyol solvent, and carrying out stirring reflux heating reaction under the atmosphere of the shielding gas; dropwise adding a NaBH4 solution dissolved by isopropanol, and reacting for a period of time; after the reaction is stopped, cooling to room temperature, centrifugally separating a solid product, washing and drying; and grinding and mixing adenine phosphate and the dried solid product, then carrying out heat treatment, and cooling to room temperature to obtain the product. The method has the advantagesof simplicity, safety and the like, and is particularly suitable for preparing cathode catalysts of fuel cells and metal-air cells.

The invention provides a highly-efficient synthetic method for 2, 6-dimethoxy-4-vinylphenol. The method comprises the following steps: with sinapic acid as a raw material and alumina as a solid-phase carrier, carrying out thermal decarboxylation in the presence of an alkaline catalyst under a microwave-assisted condition, adding a polymerization inhibitor to reduce and prevent polymerization of synthetic products, neutralizing the alkaline catalyst in the reaction system when the reaction is completed, extracting the synthetic products with an organic solvent, carrying out washing and drying, then carrying out purifying by using preparative liquid chromatography, and carrying out vacuum drying to obtain high-purity 2, 6-dimethoxy-4-vinylphenol. The highly-efficient synthetic method for 2, 6-dimethoxy-4-vinylphenol provided by the invention has the characteristics of significant improvement of reaction rate, fast temperature rise, convenient operation, high conversion rate, easy purification of the products, etc.; and the synthesized 2, 6-dimethoxy-4-vinylphenol has the properties of high purity, strong oxidation resistance, etc.

The invention relates to a benzene refining desulfurization adsorbent which takes needle-shaped aluminum oxide with a mesoporous structure as a carrier and chlorine-free noble metal Pt as an active component, and the loading capacity of the active component platinum is 0.4-1.5 wt% of the mass of the adsorbent. Pt particles are loaded on the surface of porous needle-shaped aluminum oxide to form the chlorine-free, high-stability and high-dispersion benzene refining desulfurization adsorbent.

The invention discloses a TEP-based coagulant regulation and control method and application thereof. The regulation and control method is obtained through a coagulant regulation and control model, and the regulation and control model is established based on dynamic regulation and control data obtained under a dynamic filtering condition and quantitative data obtained through a first fixed test, wherein the dynamic regulation and control data comprises the coagulant concentration obtained under the dynamic filtration condition and the value of the first quantitative characteristic of the TEP simulation pollutant corresponding to the coagulant concentration; and the quantitative data includes the coagulant concentration obtained in the first fixed test and a value of a second quantitative characteristic of the TEP simulated contaminant corresponding thereto. According to the method, an accurate, efficient and optimal regulation and control scheme can be obtained, the polymerization behavior of pollutants and deposition of the pollutants on the surface of the membrane can be controlled through the regulation and control scheme, and the purpose of preventing and controlling membrane pollution is achieved.

The invention discloses para-aramid and polyetherimide blended slurry, a preparation method thereof and a para-aramid coating diaphragm. According to the preparation method, the amount of added calcium chloride is increased when the para-aramid is synthesized, so that free calcium ions and chloride ions occupy the positions of hydrogen and oxygen in the para-aramid to eliminate hydrogen bonds between para-aramid nanofibers, then polybutylene glycol is used for blocking connection between para-aramid molecules, and polymerization between macromolecules is controlled. The para-aramid slurry forms a highly dispersed and non-deteriorating slurry. The dissolved polyetherimide solution is added to allow the highly dispersed para-aramid nanofibers to be uniformly absorbed in the polyetherimide molecular chain. When the slurry is extracted and solidified, the polyetherimide molecules will form a porous net to support a skeleton of the para-aramid nanofiber due to the detachment of the pore former, so that the whole diaphragm generates a coating diaphragm with high temperature resistance and high porosity.

The invention relates to the technical field of C30B crystal growth, in particular to a method for preparing lanthanum titanate crystals through a vertical zone melting descent method. According to the method, TiO2 and La2O3 are used as initial raw materials, the lanthanum titanate crystal is prepared through zone heating and strict control of the heat preservation time in the crystallization process, the temperature gradient of crystal production and the gradual descending speed of a crucible, the purity and yield of the prepared lanthanum titanate crystal are excellent, most importantly, the scheme provides a technology for locally heating lanthanum titanate, and the method is suitable for industrial production. On the basis of ensuring that the lanthanum titanate crystal has excellent yield and purity, the energy consumption is obviously reduced, and the method is green and environment-friendly, conforms to the modern industrial research and development concept of energy conservation and emission reduction, is suitable for industrial-grade large-scale production and popularization, and has potential application value in the field of optical evaporation materials.

The invention belongs to the technical field of medical instruments and discloses an internal medicine medication care device. The internal medicine medication care device comprises a first medicine box, a second medicine box, a third medicine box and a driving box. The second medicine box is arranged on one side of the first medicine box, and the third medicine box is arranged on the other side of the second medicine box. The first medicine box, the second medicine box and the third medicine box are arranged above the driving box. Medicine popping devices are arranged on the surfaces of the first medicine box, the second medicine box and the third medicine box. One side of the driving box is provided with a stirring box and a hot water box, wherein the hot water box is located below the stirring box. One side of the stirring box is provided with a water guiding pipe. One side of the hot water box is provided with a water suction pipe. The first medicine box, the second medicine box and the third medicine box can be controlled through the driving box to aggregate medicines and stir the medicines inside the stirring box; due to the fact that the hot water box can supply hot water, direct brewing can be performed, and the medicines can be guided out through the water guiding pipe.

The invention discloses a method for preparing starch nanoparticles with controllable particle size by an emulsifier-assisted biological enzyme method, which is characterized in that it specifically comprises the following steps: (1) preparing a buffer solution; (2) activating a debranching enzyme; (3) ) preparation of starch milk; (4) gelatinization (stretching of starch chains); (5) enzymatic debranching; (6) separation of short straight chain solutions; (7) deactivation of enzymes; (8) adding emulsifiers to control the crystallization process; (9) recrystallization; (10) drying. The invention has low equipment requirements, simple process, easy operation, mild reaction, short reaction time, high efficiency, and is suitable for large-scale production; the product performance is good, and the particle size of the prepared starch nanoparticles can be controlled between 9-30nm, and the dispersibility is excellent. It has good thermal stability, low preparation cost, less energy consumption, no harmful waste generation, and meets the modern production requirements of green production, environmental protection and energy saving.

The invention discloses a nitrogen-phosphorus co-doped metal-organic framework-encapsulated platinum-cobalt-based alloy, a preparation method and application thereof, and belongs to the technical field of fuel cell nano-catalyst synthesis. Dissolve the platinum precursor, cobalt precursor and doped metal precursor in isopropanol, and adjust the pH of the solution to > 11; stir at room temperature under a protective gas environment to obtain a metal salt mixed solution; impregnate ZIF‑67 into the metal In the salt mixed solution, seal the ultrasonic wave and let it stand still, then disperse it in the polyol solvent, stir and reflux under the atmosphere of protective gas and heat the reaction; drop NaBH dissolved in isopropanol 4 Solution, react for a period of time; after stopping the reaction, cool to room temperature, centrifuge to separate the solid product, wash, and dry; grind and mix adenine phosphate and the dried solid product, then heat-treat, and cool to room temperature to obtain the product. The method has the advantages of simplicity, safety, etc., and is especially suitable for the preparation of cathode catalysts for fuel cells and metal-air batteries.

The invention relates to the field of solid waste resource utilization, and provides a production process for preparing alkali cementitious materials from coal gangue, comprising the following steps: (1) sending the coal gangue for crushing, ball milling, and sieving to obtain coal gangue powder; (2) Put the coal gangue powder into the mixed acid solution, stir evenly, let it stand for several days, suction filter and dry; (3) mix the coal gangue powder obtained in step (2) with the salt mud, calcine at high temperature, and then ball-mill for a second time after cooling , sieve to obtain mixed powder; (4) weigh each raw material by the following parts by weight: 50-80 parts of mixed powder, 20-40 parts of slag powder, 4-8 parts of activator, 24-36 parts of water; (5 ) Mix the raw materials evenly to obtain the alkali gelling slurry; (6) inject the alkali gelling slurry into the mold and vibrate for molding, cure at normal temperature until demoulding, and steam at 66-72° C. for 8 hours. The invention not only solves the problems of resource waste and environmental pollution of coal gangue waste, but also prepares an alkali gelling material with excellent performance.

The invention provides a preparation method for converting glycerol into a glycerol derivative system simultaneously containing glycerin ether and glyceride to be used as a fuel additive. Low-carbon alcohol and glycerol are used as starting materials, the mol ratio of the low-carbon alcohol to the glycerol is 2:1 to 8:1, the dosage of acid catalysts accounts for 0.5 percent to 10 percent of the total mass of reactants, water absorbents account for 1.5 percent to 10 percent of the total mass of the reactants, nitrogen gas is used for replacing air in a kettle, the initial pressure in the kettle is 0 to 4 MPa, the reaction temperature is 30 to 130 DEG C, and the reaction time is 4 to 10 hours; and the reduced pressure distillation is carried out after cooling, then, the acylation reaction is carried out, the reaction temperature is 60 to 150 DEG C, the reaction time is 1 to 4 hours, and glyceryl biological fuel additives are obtained. The fuel combustion performance can be improved through glycerin ether, and simultaneously, the fuel viscocity can be improved through the contained glyceride. The acidylation is carried out after the etherification, and the problem of low glycerol hydroxyl etherification rate is solved, so the additives and the fuel are mixed more uniformly. The catalyst and the water absorbents recovered through filtering and the low-carbon alcohol can be repeatedly utilized.

The invention discloses an inter-domain routing recovery method based on a degree constraint minimum spanning tree. The inter-domain routing system subjected to the BGP-LDoS attack is expressed as a generation forest, by utilizing a basic migration algorithm, a complex migration algorithm, a single-tree forest correction algorithm, an FT key node selection algorithm, a CT key node selection algorithm and the like, an inter-domain routing recovery topology based on a degree constraint minimum spanning tree is constructed under the condition of meeting a set degree constraint, meanwhile, node migration information during topology generation can be recorded in the creation process of an orientation constraint minimum spanning tree. In the process of recovering topology establishment, aggregation of node degrees can be effectively controlled, nodes with over-height numbers are prevented from being generated, and the calculation complexity of the topology generation process is effectively reduced.

The invention discloses a method for synthesizing polycarboxylate superplasticizer through a RAFT method. According to the method, firstly, macro-monomers A are added into a reaction kettle, water is added, water bath heating is performed till the temperature is 65-85 DEG C, and constant-temperature stirring is performed; then, a trithio ester chain transferring agent is dissolved in a mixed solution of micro-monomers B and water, the mixture is dropwise added into the reaction kettle at constant speed, and meanwhile an initiator aqueous solution is dropwise added; after all the needed matter is dropwise added, a stirring reaction lasts for 3-5 h under the continuous constant-temperature stirring condition of 65-85 DEG C; after the reaction ends, an alkali solution and water are added to adjust PH to 6-7, and the polycarboxylate superplasticizer is obtained after reaction products are cooled to room temperature. By means of the method, the molecular-structure-controllable polycarboxylate superplasticizer can be prepared, the molecular weight is controllable, the molecular weight distribution range is narrow, polymer molecule design can also be performed, and the method has great significance in research and development of the polycarboxylate superplasticizer synthetic technology.

The invention discloses a poly(carbonic ester-ether) type polyurethane resin and a preparation method thereof and leather pulp, belonging to the technical field of leather pulp. The technical problems that raw materials for preparation of polyurethane leather pulp depend on petrochemical products and a catalyst used in the preparation has potential hazards in the prior art are overcome in the invention. The leather pulp provided by the invention comprises, by weight, 85 to 120 parts of the poly(carbonic ester-ether) type polyurethane resin, 0.26 to 0.98 part of a surfactant, 0.42 to 1.3 parts of an antifoaming agent, 0.13 to 0.27 part of a leveling agent and 128 to 200 parts of dimethyl formamide, wherein the structural formula of the poly(carbonic ester-ether) type polyurethane resin is shown in a formula I as described in the specification. The leather pulp does not depend on petroleum resources, is safe and environment-friendly, has excellent tensile strength and elongation at break and does not undergo yellowing under long-term irradiation of ultraviolet rays, wherein tensile strength is as high as 60 MPa and elongation at break is as high as 1200%.