227results about How to "Rich preparation method" patented technology

The invention discloses a freeze beverage containing isomaltose hypgather and process for preparation, wherein the raw materials comprise the following constituents (by weight ratio): cow's milk and / or dairy product and / or dairy product analogues 0-90%, isomaltose hypgather 0. 01-10. 0%, sugar 4. 0-16. 0%, stabilizing agent 0. 1-1. 0%, sour flavor agent 0-0. 7%, edible flavoring essence 0. 01-0. 4% and balancing water.

The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.

The invention discloses a self-repair material with a shape memory effect. The self-repair material is prepared from a shape memory polymer material, a shape memory function can be achieved under the stimulation of light, heat, electricity and magnetism, and moreover, the self-repair and healing purposes are achieved. The composition and preparation method of the self-repair material are diversified, the shape change and self-repair functions of the shape memory material can be achieved through different manners, and the application of the shape memory material in the fields such as spaceflight, aviation, medical treatment and bioengineering is expanded.

The invention discloses a synthesis method of a polycarboxylic acid high-performance water reducing agent of a star-like structure, belonging to the field of a water reducing agent. According to the synthesis method, polybasic alcohol, (methyl) acrylic acid, a polyethylene glycol compound and the like are used as esterification raw materials, and the polycarboxylic acid high-performance water reducing agent of the star-like structure is prepared through a sequential esterification and polymerization method, i.e., the (methyl) acrylic acid and the polybasic alcohol are used as reactants, a star-like polymerizable active end is prepared through esterification reaction under the action of a catalyst, and then the polycarboxylic acid high-performance water reducing agent is prepared from the star-like polymerizable active end and esterification macromolecule, a molecular weight regulator and an unsaturated carboxylic acid monomer under the action of an initiator through free radical polymerization reaction. The synthesis method has the advantages of simplicity, easiness in control, high polymerization degree, low cost, no pollution, capability of realizing the polycarboxylic acid high-performance water reducing agent of the star-like structure connected with a plurality of polycarboxylic acid molecules, and more superior cement paste fluidity and holding capacity, good cement adaptability and concrete application performance compared with the conventional linear and comb-shaped polycarboxylic acid water reducing agent in the case of normal and low added amount.

The invention provides a method for preparing an electrostatically self-assembled drug carried layer. The method includes (1) performing surface modification pretreatment on a medical apparatus; (2) performing charge load surface pretreatment on the medical apparatus to form charge, which is the same to the charge carried by a first weak polyelectrolyte, on the surface of the medical apparatus; (3) preparing solution of a second weak polyelectrolyte and solution of a third weak polyelectrolyte, dissolving a drug in the second weak polyelectrolyte solution or the third weak polyelectrolyte solution; (4) soaking the medical apparatus with charge carried surface in the second weak polyelectrolyte solution, taking out, washing; (5) soaking the medical apparatus in the third weak polyelectrolyte solution, taking out, washing; and (6) repeating the step (4) and the step (5) alternately to form alternate electrostatically self-assembled drug carried layer with a desired drug density on the surface of the medical apparatus. The drug is included in the weak polyelectrolyte molecule layer.

The invention relates to a monoatomic catalyst for preparation of low-carbon olefin by means of dehydrogenation of low-carbon hydrocarbons, and a catalytic method. The catalyst is obtained by supporting metal active components, dispersed in an isolated monoatomic form, on a carrier, or supporting the metal active components on the carrier in a form in which single atoms and metal nanoparticles coexist. The metals in the metal active components are preferably selected from at least one of chromium, manganese, iron, cobalt, nickel, copper, gallium, molybdenum, ruthenium, rhodium, palladium, silver, iridium, platinum and lead; the carrier is prepared from one or more of a carbon-nitrogen material, a carbon material or oxides. The catalyst provided by the invention can realize the reduction ofmetal consumption and has very good stability; the catalyst can significantly reduce the reaction temperature while guaranteeing high catalytic performance, reduces the energy consumption, effectively avoids the formation of carbon deposit, and increases the production efficiency. The catalyst can catalyze a dehydrogenation reaction of the multiple low-carbon hydrocarbons such as isobutane, n-butane, butene, propane and ethane so as to produce corresponding low-carbon olefin products, thus being wide in application range; the monoatomic catalyst is multiple in preparation methods, wide in rawmaterials, low in cost and suitable for mass industrial production.

The invention provides a functional flexible electrode which comprises a flexible substrate, wherein an electrode material is arranged on one surface of the flexible substrate and a functional material is arranged on the other surface of the flexible substrate. A preparation method for the functional flexible electrode provided by the invention is various; the shape change can be realized through the stimulation of temperature, humidity, light, and the like; the mode is various; the control is convenient; and a firm basis is established for the application of the functional flexible electrode in the wearing and implantable medical fields.

The invention provides a novel anti-counterfeit mark. The novel anti-counterfeit mark comprises an anti-counterfeit mark base and an invisible anti-counterfeit pattern, wherein the regional difference is formed through micro-nano materials and the anti-counterfeit mark base, so that the invisible anti-counterfeit pattern is formed, the surface of the anti-counterfeit mark base comprises an invisible anti-counterfeit pattern area and a non-pattern area, the invisible anti-counterfeit pattern area or the non-pattern area is composed of a film layer formed on the surface of the anti-counterfeit mark base through micro-nano materials, and the micro-nano materials include organic particles, inorganic particles, photoresist, photosensitive resin, metal, alloy, ceramic, polymer, active micromolecules, an oxide, a sulfide, a nitride and a carbide or a binary compound or polycompound composed of III-V or II-IV or IV-VI elements. According to the novel anti-counterfeit mark, the invisible anti-counterfeit pattern can appear when the anti-counterfeit mark is located at the position of an air blowing opening or encounters with water or steam, the invisible anti-counterfeit pattern can become invisible after water is volatilized, and the anti-counterfeit mark can be used for counterfeit prevention in the fields such as the medicine field, the food safety field and the financial field. The invention further provides a manufacturing method of the novel anti-counterfeit mark.

The invention relates to a waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite film and a preparation method. Through pre prepolymeriztion reaction of polytetrahydrofuran gl and diisocyanate and chain extension by a hydrophilic chain extender, then a neutralizing agent is added, subsequently, deionized water is added for emulsification dispersion to obtain a waterborne polyurethane emulsion; waterborne polyurethane and MXene are prepared into water dispersion liquid, MXene is added to the waterborne polyurethane under stirring, continuous stirring is carried out to enable waterborne polyurethane macromolecules to be fully and uniformly adsorbed on MXene nanosheets. And waterborne polyurethane-MXene composite dispersion liquid is obtained; and a series of nanocomposite films are prepared by a vacuum filtration method, a solvent evaporation method or a coating method. The prepared nanocomposite thin films have ordered "brick-wall" structures in a bionic shell layer shape on the micro and nano scales, the mechanical properties are excellent, the flexibility is good, the electromagnetic shielding effectiveness is excellent, preparation methods are diverse, thethickness is controllable, and application is wide.

The invention, which belongs to the infrared detector field, particularly relates to a near infrared photoelectric detector with enhancement based on utilization of indium tin oxide nanoparticles. The near infrared photoelectric detector successively comprises transparent glass (1) with high infrared transmissivity, a transparent electrode (2), a photoelectric conversion material (3), indium tin oxide nanoparticles (4), and a back electrode (5) from top to bottom. After incident infrared radiation passes through the transparent glass (1), the transparent electrode (2), and the photoelectric conversion material (3), a portion of the infrared radiation is localized at the surfaces of the indium tin oxide nanoparticles (4), scattering is generated and a surface plasma polariton transmission mode is formed, so that an effective transmission distance of the incident electromagnetic wave in the photoelectric conversion material (3) can be increased. According to the invention, the near infrared photoelectric detector with enhancement based on utilization of indium tin oxide nanoparticles has advantages of diversity of a preparation technology, low manufacturing cost, adjustable enhancement resonant position and high sensitivity and the like.

The invention belongs to the technical field of solar cells, in particular to a long-range plasmon waveguide array synergy unit for a solar cell. The specific structure of the long-range plasmon waveguide array synergy unit consists of a long-range plasmon waveguide array, a diffraction grating, a transparent conducting thin film, a glass substrate and a photovoltaic material. The long-range plasma laser waveguide array synergy unit is characterized in that: surface plasmons generated by the waveguide array synergy unit are used for localization to enhance the light field strength on the metal waveguide surface and improve the absorptivity of the solar cell to incident sunlight. Through the technology, the absorptivity of the solar cell to incident sunlight is increased under the condition of not affecting the normal absorption of a photovoltaic material on the top layer to the incident light of a light-facing face, and then the photoelectric conversion efficiency of the solar cell isimproved.

The invention belongs to the technical field of solar batteries, in particular relating to a synergy method of a surface plasmon metallic nano-chain in a solar battery. In the process of manufacturing the solar battery, a layer of metallic nano-film consisting of the metallic nano-chain is manufactured between the back electrode and photovoltaic layer of the solar battery. An incident light is localized on the surface of the metallic nano-chain after passing through a light cathode and the photovoltaic layer to form a horizontally transmitted surface plasmon transmission mode, therefore, the effective transmission distance of the incident light at the photovoltaic layer is greatly increased, thereby, improving the absorption efficiency of the solar battery to the incident light and greatly improving the photoelectric conversion efficiency of the solar battery. The technology further has the advantages of diversified manufacturing processes, low manufacturing cost, obvious synergy effect and the like.

The invention belongs to the technical field of genetic engineering and medicine and in particular relates to an affinity peptide L8 of a PD-1 (programmed death-1) protein extracellular domain and an application thereof. The amino acid sequence of the affinity peptide L8 is Ser-Leu-Pro-Ser-Thr-Thr-Thr-Met-Arg-Leu-Thr-Ser, namely S-L-P-S-T-T-T-M-R-L-T-S, and the molecular weight of the affinity peptide L8 is 1293.7. The affinity peptide L8 is applied to preparation of antitumor related drugs and the tumor is colon cancer or melanoma. The affinity peptide L8 is synthesized by adopting a Fomc solid-phase peptide synthesis method. The obtained affinity peptide L8 of the PD-1 (programmed death-1) protein extracellular domain has clear effects and targets, has obvious inhibitory effects on tumors, especially on the colon cancer or melanoma, does not have obvious side effects and can obviously lengthen the lifetime of experimental animals; therefore the affinity peptide L8 has better medical application prospects.

The invention provides a preparation method for tetragonal phase nano barium titanate. The preparation method comprises the steps as follows: i), preparing water solutions of barium chloride and oxalic acid respectively, and mixing alcoholic solution of butyl titanate and oxalic acid solution uniformly to obtain titanium oxyoxalate complex ion solution; ii), adding titanium oxyoxalate complex ion solution obtained in the step i) into a supergravity reactor as a circulating flowing phase to control the supergravity level; and meanwhile, dropping barium chloride solution to obtain white barium titanyl oxalate precipitation suspension as a precursor of barium titanate, and keeping the pH value of the whole system at 2.5-3.5 during reaction; and iii),ageing the precipitation suspension obtained in the step ii), leaching, washing and drying to obtain white barium titanyl oxalate power. The preparation method provided by the invention has the advantages that tetragonal phase nano barium titanate can be prepared; and the particle size of the prepared power can be controlled to be within the range of 30-90 nm; the average particle size is small, and the particle size is narrow in distribution; and the degree of crystallinity is high, and the crystal formation is intact.

The invention discloses a novel single phosphorus ligand PC-Phos of a xanthene framework. The ligand is a compound as shown in a formula (1) or an enantiomer, racemate or diastereoisomer of the compound as shown in the specification. The invention further discloses a preparation method of the ligand. A formula 2 and a formula 4 as shown in the specification serve as raw materials, and substitution reaction, addition reaction, condensation reaction and reduction reaction are performed to prepare the ligand. Alternatively, a formula 6 and the formula 4 as shown in the specification serve as raw materials, are subjected to condensation reaction and subjected to addition reaction with a formula as shown in the specification to prepare the ligand. Chiral sulfonamide 4 with two structures and different types of metallic reagents are subjected to addition reaction, and optical voidness of four full structures 1 (S, Rs), 1 (R, Rs), 1 (S, Ss) and 1 (R, Ss) of the chiral single phosphorus ligand can be obtained. The invention further discloses an application of the ligand to asymmetric cyclization reaction in catalytic allene amine molecules. The ligand has quite high reaction activity, stereo-selectivity and wide application values.

The invention relates to the technical field of photoelectron, in particular to a plane-configured organic infrared or ultraviolet photovoltaic semiconductor detector which comprises a substrate, an organic infrared or ultraviolet photovoltaic semiconductor, a low work function electrode and a high work function electrode. The detector is characterized in that the low work function electrode and the high work function plane are in the same plane. The plane-configured organic infrared or ultraviolet photovoltaic semiconductor detector technology of the invention can be applied to manufacture a plane-configured organic infrared photovoltaic semiconductor detector and a plane-configured organic ultraviolet photovoltaic semiconductor detector. Compared with the optical waveguide detector, the detector of the invention has the advantages of fast response speed, low power dissipation, easy formation of array, no need of offsetting and the like. In addition, the detector of the invention has the characteristics of low cost, easy realization of controllable electrical resistivity of large area photosensing materials, no need of refrigeration, realization of flexible processing and the like, thus having important potential application values in the military field, the civil field and some specific fields.

The invention discloses a polyvinylidene fluoride piezoelectric non-woven fabric, and a preparing method and application thereof. The method includes 1, dissolving polyvinylidene fluoride in common electrospinning solvent, and obtaining polyvinylidene fluoride solvent; 2, allowing the polyvinylidene fluoride solvent to stand to form gel solid, performing special heating processing on the gel solid, and cooling to obtain polyvinylidene fluoride electrospinning solvent; 3, optimizing process parameters of electrospinning, utilizing the polyvinylidene fluoride electrospinning solvent prepared in step 2 to electrospin through an electrospinning machine, soaking the obtained product into deionized water, and then taking out and drying to obtain nano piezoelectric non-woven fabric with fine piezoelectric property. The preparing method is simple in operation, maintaining time of the polyvinylidene fluoride electrospinning solvent is prolonged, operability of the polyvinylidene fluoride electrospinning is improved, development of researching polyvinylidene fluoride electrospinning can be promoted, and the new method is provided for preparing the piezoelectric non-woven fabric.

The invention relates to a method for directly synthesizing a pure solid high-performance polycarboxylate water-reducer in one step, belonging to the field of water-reducers. According to the method, the pure solid high-performance polycarboxylate water-reducer is prepared by taking an acrylic compound and unsaturated polyoxyethylene ether as polymerization reaction monomers, adding a molecular weight regulator and carrying out free-radical polymerization reaction under the action of an initiator and under a solvent-free environment. The method disclosed by the invention is strong in controllability, high in polymerization degree, low in cost, environment-friendly and pollution-free, achieves the purpose of preparing the absolutely anhydrous pure solid polycarboxylate water-reducer by bulk polymerization, not only has the fluidity and holding property of cement paste, cement adaptability and concrete application performance which are similar to those of a polycarboxylate water-reducer prepared from a common solution by polymerization and can be prepared into any concentration of solution according to actual demands as the pure solid high-performance polycarboxylate water-reducer prepared by direct polymerization is an anhydrous pure solid, but also is free of postprocessing working procedures, such as heat drying or solvent separation and is more convenient to transport, saved in transport cost and favorable in market competitiveness and application prospect.

This invention relates to a method for preparing a star-shaped polycarboxylate superplasticizer by the first esterification step with polyol and (meth)acrylic acid as main reactants and the second polymerization step. In the first step, the star-shaped polymerizable active ends were synthesized by esterification between polyol and (meth)acrylic acid in the presence of catalyst. In the second step, the final star-shaped polycarboxylate superplasticizer was prepared by radical polymerization among the product obtained in first step, unsaturated polyoxyethylene ethers, molecular weight regulator and unsaturated carboxylic acid in the presence of initiator. The production process of this invention exhibits some characteristics including simple, easily controllable, high polymerization degree, low cost and pollution free. The star-shaped molecular structure of polycarboxylate superplasticizer can be achieved through synthesizing active “core” by esterification and “arm” by radical polymerization. It showed better cement paste fluidity and fluidity retention, which manifested as better adaptability to cement and application performance in concrete, than both traditional linear and comb-shaped polycarboxylate superplasticizer at common or lower dosage.

The invention discloses an organic long-afterglow material as well as a preparation method and an application thereof. The organic long-afterglow material comprises a host molecule and a guest molecule, wherein the host molecule is carbazole, and the guest molecule is diphenylphosphinic anhydride. The host molecule and the guest molecule are mixed in a certain mass ratio and doped in a polyvinyl alcohol solution, the mixture is applied to a base material and dried to form a film, and an organic room-temperature phosphorescent material can be obtained. The preparation method is simple and easyto control and ingredients are simple. The material has good flexibility and transparency, the phosphorescence intensity of carbazole is notably improved and the phosphorescence lasting time of carbazole is remarkably prolonged through doping of the guest molecule, and the afterglow lasting time can reach 22 s. Fluorescence emission and phosphorescence emission under the room temperature conditionare realized simultaneously, and the organic long-afterglow material has high stealthiness and is convenient to use and easy to recognize, thereby realizing the high-grade anti-counterfeiting function. The organic long-afterglow material has good application prospects in the fields of organic optoelectronic materials, anti-counterfeiting, encryption and the like.

The invention discloses to a method used for simultaneous preparation of phospholipid microtubule and vesicle using point-plane electrode electric field. The method is used for solving a problem that existing method is not capable of realizing simultaneous preparation of phospholipid microtubule and vesicle. The method comprises following steps: step 1, electrode cleaning; step 2, preparation of phospholipid dry membrane; step 3, assembling of a sealed preparation apparatus; and step 4, preparation of the phospholipid microtubule and vesicle, and obtaining of the phospholipid microtubule and vesicle. Advantages of the method are that: firstly, the method is capable of realizing simultaneous preparation of the phospholipid microtubule and vesicle using point-plane electrode electric field in a same system, form of the obtained phospholipid microtubule is good, yield is high, and phospholipid microtubule size is relatively large and uniform; and secondly, the length of the obtained phospholipid microtubule ranges from 200 to 1300 mum, and diameter ranges from 1 to 2 mum; and diameter of the obtained phospholipid vesicle ranges from 15 to 120 mum. The method is used for simultaneous preparation of the phospholipid microtubule and vesicle using point-plane electrode electric field.

The invention relates to a method for preparing a molybdenum disulfide / carbon composite multi-grade porous material. The method comprises the following steps: adding water into sodium molybdate, thioacetamide and agarose and dissolving; then heating in a water bath; after reacting, pouring out a solution when the solution is hot, and cooling; transferring a cooled sample into a refrigerator for refrigerating; then transferring the sample into a freeze dryer for drying; finally, putting the sample into a tubular furnace and calcining to prepare the molybdenum disulfide / carbon composite multi-grade porous material. The molybdenum disulfide / carbon composite multi-grade porous material prepared by the method provided by the invention has good electrical conductivity; when being used as an electrode material for a super-capacitor, the molybdenum disulfide / carbon composite multi-grade porous material has the advantages of high specific capacity, good circulating performance, stable structure and the like; when being used in a lithium ion battery, the molybdenum disulfide / carbon composite multi-grade porous material has the advantages of good rate performance, high circulating stability and the like; the disadvantages of two energy storage devices can be made up very well, and the molybdenum disulfide / carbon composite multi-grade porous material can be used as a good energy storage material and widely applied to the super-capacitor and the lithium ion battery.

The invention discloses a lithium ion battery cathode material carbon microsphere and a preparation method thereof. The preparation method comprises that in the presence of a catalyst, through optimization of condition factors such as a temperature in a reaction vessel system, time and carbon source kinds, a carbon microsphere intermediate having controllable morphology is obtained, and the carbon microsphere intermediate is sintered into a carbon microsphere sample in an inert atmosphere in a tubular furnace. The preparation method ingeniously and efficiently utilizes raw materials, fills the gap of development of a nano-material in lithium ion battery cathode material preparation, enriches a material preparation method, and effectively solves the problem that the existing carbon cathode material of a lithium ion battery has a high first irreversible capacity and poor rate discharge performances.

The invention discloses a propolis flavonoid extractive and a preparation method thereof, which belong to the field of traditional Chinese medicine modernization. According to the technical scheme, the preparation method comprises the following steps of: freezing propolis at -40 DEG C to -80 DEG C, and crushing the frozen propolis; adding alcohol into the crushed propolis, and performing extraction on the crushed propolis by an ultra-high-pressure extraction device, and concentrating and drying an extracting solution, thereby obtaining the propolis flavonoid extractive. The propolis flavonoid extractive and the preparation method provided by the invention have the advantages that the yield of propolis flavonoids is high; the extractive liquid is clear and is easy to filter; and the preparation method is simple to implement, and is suitable for industrial mass production.

The invention provides a hydrophilic functional carbon sphere and a preparation method thereof. The hydrophilic functional carbon sphere uses starch as a raw material, the hydrophilic functional carbon sphere with uniform size is prepared through hydrothermal reaction, then the hydrophilic functional carbon sphere is used to remove heavy metal ions in the waste water in the form of a solution, and the invention further provides the application of the hydrophilic functional carbon sphere for removing the heavy metal ions in the waste water. The hydrophilic functional carbon sphere prepared through the method has favorable dispersity and stability, and can be stably dispersed in water for more than one month without precipitating, so that the effect of removing the heavy metal ions in water treatment is improved, the removal rate of the heavy metal ions of the hydrophilic functional carbon sphere is higher than that of a hydrophobic carbon material by 35% under the same conditions, the hydrophilia of the carbon sphere is controlled through controlling the hydrothermal temperature and the hydrothermal time, and the operation is simple.

The invention provides a simple preparation method of hollow hydroxide derived from MOFs. The simple preparation method comprises the steps: firstly, carrying out an interfacial reaction on rhombic dodecagonal ZIF-67 or bi-metal MOF and an ethanol solution of NaOH to form a hydroxide shell on the surface of MOF; and then, selectively removing an unreacted MOF template to obtain a porous / hollow structural metal hydroxide with a uniform shape. The invention relates to the preparation method for obtaining the porous / hollow metal hydroxide by sequentially carrying out an interfacial reaction and selective dissolution.

The invention particularly provides a corn deep-processing method. The method includes selecting highly qualified corns, drying and threshing; peeling the corn grains through a peeling machine; smashing, filtering, separating, packaging and storing the peeled corn blastula. According to a prepared product cooking method, the prepared product can be puffed, baked and boiled independently to prepare corn ballast porridge and can be mixed with other grains to prepare mixed porridge or health caring porridge; corn flour can be used for preparing steamed breads, noodles, steamed tough breads, corn flour porridge, corn biscuits or other corn products. The method has the advantages that the corn cooking method is enriched, the corn taste is improved, human body absorption is benefited, the corn product storing period is prolonged, the employment opportunity increase is promoted, the economic incoming increase is enhanced, circular economic is optimized, and the adapting range is expanded.

A method for preparing comb structure temperature / pH-responsive polycarboxylic acid by end-group functionalization adopts temperature / pH-responsive monomer, unsaturated halogenated hydrocarbon, small monomer of carboxylic acid and other raw materials to prepare polycarboxylic acid material via self-polymerization, substitution and copolymerization. Temperature / pH-responsive monomers are first self-polymerized to obtain temperature / pH-responsive polymer chain with end-group functionalization, and then substitution with unsaturated halogenated hydrocarbons is conducted to obtain temperature / pH-responsive macromonomers with end-group functionalization, finally the obtained product is copolymerized with small carboxylic acid monomers to prepare comb structure polymer with polycarboxylic acid main chain and temperature / pH-responsive side chain.

The invention discloses a synthesis method of a polycarboxylic acid high-performance water reducing agent of a star-like structure, belonging to the field of a water reducing agent. According to the synthesis method, polybasic alcohol, (methyl) acrylic acid, a polyethylene glycol compound and the like are used as esterification raw materials, and the polycarboxylic acid high-performance water reducing agent of the star-like structure is prepared through a sequential esterification and polymerization method, i.e., the (methyl) acrylic acid and the polybasic alcohol are used as reactants, a star-like polymerizable active end is prepared through esterification reaction under the action of a catalyst, and then the polycarboxylic acid high-performance water reducing agent is prepared from the star-like polymerizable active end and esterification macromolecule, a molecular weight regulator and an unsaturated carboxylic acid monomer under the action of an initiator through free radical polymerization reaction. The synthesis method has the advantages of simplicity, easiness in control, high polymerization degree, low cost, no pollution, capability of realizing the polycarboxylic acid high-performance water reducing agent of the star-like structure connected with a plurality of polycarboxylic acid molecules, and more superior cement paste fluidity and holding capacity, good cement adaptability and concrete application performance compared with the conventional linear and comb-shaped polycarboxylic acid water reducing agent in the case of normal and low added amount.

The invention discloses a method for preparing cellulose-based aerogel by bidirectional gradient. The invention aims to prepare a cellulose-based aerogel with a honeycomb structure and realize a highadded value application of the cellulose-based aerogel. The method is characterized by comprising the following steps: 1) manufacturing an adiabatic wedge body, placing the adiabatic wedge body at thebottom of a plastic mold, placing the mold on a metal heat conducting rod, and placing the metal heat conducting rod in a liquid nitrogen container; 2) adding cellulose or a cellulose-based aqueous solution into the mold; 3) adding liquid nitrogen into the container to mold the solution by freezing; and 4) carrying out drying and demolding. The cellulose aerogel prepared by the method has broad application prospects in the aspects of material adsorption, heat insulation protection, drug carriers and the like.