56results about How to "Modification conditions are mild" patented technology

The invention relates to a method for enhancing hydrophilic stability of a macromolecular film by using metal ions to complex with polyphenol. The method comprises the following steps of firstly, soaking the macromolecular film or an organic surface into an alcohol solvent or water, or cleaning; fetching out, and soaking by a mixed solution containing a crosslinking agent and hydrophilic moleculesfor the second time; fetching out, soaking into a mixed solution containing a polyphenol compound and a mixed solution containing metal ions, and modifying the surface for the third time and the fourth time; finally, fetching out, cleaning and drying. The method has the advantages that the conditions are mild, the operation is simple and convenient, the cost is lower, and the like; the hydrophilic property, anti-oil dirt property and hydrophilic stability of the obtained modified macromolecular film or the inorganic surface are obviously enhanced, the application range of the raw materials isgreatly broadened, and the popularization and application prospect is better.

The invention discloses a method for preparing super-hydrophobic silica aerogel by atmospheric pressure drying. The method comprises the following steps: 1) preparing sol; 2) gelatinizing the sol; 3)aging gel; 4) exchanging a gel solvent; 5) carrying out surface hydrophobic modification; and 6) carrying out drying under atmospheric pressure. According to the preparation method of the silica aerogel, provided by the invention, tetraethoxysilane is used as a silicon source, ethanol is used as a solvent, acid and alkali are used as catalysts, and trimethylchlorosilane is used as a surface modifier, so that super-hydrophobic silica aerogel is prepared by atmospheric pressure drying. The prepared SiO2 aerogel with a super-hydrophobic three-dimensional network structure is tested to have a highspecific surface area, low density and good hydrophobicity at a room temperature. Therefore, the silica aerogel prepared through the method provided by the invention has excellent adsorption performance and has a good application prospect in the field of energy conservation. The preparation method of the silica aerogel under atmospheric pressure, provided by the invention, is simple in procedureand low in equipment requirements, can also shorten the process flow and reduce the cost, and is easy to industrialize.

The invention discloses a preparation method for a surface ionization modified polysulfone ultrafiltration membrane. The preparation method comprises the following steps: 1) dissolving polysulfone, poly-2-(dimethylamino) ethyl methacrylate- polysulfone-2-(dimethylamino) ethyl methacrylate triblock copolymer into a solvent to obtain casting membrane solution; 2) leading the casting membrane solution to flow through a film forming machine, soaking in a coagulating bath to obtain polysulfone membrane; 3) soaking the polysulfone membrane in bromoacrtic solution to carry out surface quaternization treatment; and 4) cleaning and drying to obtain the surface ionization modified polysulfone ultrafiltration membrane. According to the invention, the polysulfone ultrafiltration membrane is prepared by carrying out solution mixing to poly-2-(dimethylamino) ethyl methacrylate-contained amphipathic block copolymer with polysulfone through an immersion sediment phase conversion method, the membrane surface has anion and cation after the surface quaternization treatment is carried out by the bromoacrtic solution, and the hydrophilcity and anti-pollution capability of the membrane are greatly improved. The preparation method is simple and convenient, mild in modification conditions, obvious in effect and the like, and can prepare high-hydrophilcity, large-flux and anti-pollution polysulfone ultrafiltration membrane.

The invention discloses a preparation method of a modified electrode for detecting uric acid, characterized by firstly preparing amino hyper branched polyamide-amine HBP-NH2, then preparing HBP-NH2 modified carboxylated carbon nanotube CCNT-HBP-NH2, and then preparing a CCNT-HBP-NH2 / UCo3O4 / Nafion electrode modification liquid; and finally, coating the electrode modification liquid on the surfaceof the polished and cleaned glassy carbon electrode, and drying to obtain a composite film modified glassy carbon electrode. The prepared composite film modified glassy carbon electrode can be used for direct detection of uric acid concentration in urine and blood plasma, and has the advantages of sensitiveness, accuracy, stableness, high selectivity and the like.

The present invention discloses a dopamine-based modified polymer film and a preparation method thereof, and belongs to the field of environmental materials. The dopamine-modified polymer film preparation method comprises: (1) self-polymerizing dopamine on the surface of polymer powder, and adhering the generated poly dopamine function layer onto the surface of the polymer powder; and (2) preparing the film from the dopamine-modified polymer powder by using a solution phase conversion film forming method. According to the present invention, the film forming material is modified with dopamine and then the film is formed, such that the film structure can be controlled flexibly and conveniently according to the use need; the prepared film has good hydrophilicity and good pollution resistance, and can be further subjected to functionalized modification; the modification does not damage the film material, and does not sacrifice the physical and chemical properties of the original film; the method has advantages of simple process, good effect, energy saving and environmental protection; and the prepared film has good hydrophilicity and good pollution resistance, and is suitable for various film separation fields.

The invention provides a preparation method for a low-cost hollow carbon sphere-based oxygen reducing catalyst and a hollow carbon call of a catalyst which is loaded with uniformly dispersed transition metal oxide nano-particles. The preparation method for a transition metal oxide-loaded hollow carbon sphere oxygen reducing catalyst comprises the following steps: (1) weighing a suitable amount of a template agent and a transition metal cation salt, and synthesizing a transition metal oxide-loaded hollow polymer sphere precursor by adopting a hydrothermal reaction; (2) sintering the hollow polymer sphere precursor which is obtained in the step (1) for a period of time in a sintering device in the atmosphere of inert gas, naturally cooling to room temperature, and preserving for a suitable time at the room temperature to obtain a transition metal oxide nano-particles-loaded hollow carbon sphere oxygen reducing catalyst. The preparation method provided by the invention is simple and easy to operate; moreover, the raw materials are low in cost and are helpful to realize industrial application thereof.

The invention belongs to the technical field of water processing, and discloses a preparation method and an application of a hydrophilic polyurethane porous carrier. According to the invention, foamed polyurethane processed through an ozone surface treatment is subject to surface grafting copolymerization modification by using an acrylic acid and sulfuric acid aqueous solution with quadravalent cerium ions as an initiator. A reaction is carried out for a certain period of time; and the porous polyurethane carrier is washed and dried. With the method, a fixed microbial amount of the hydrophilic porous polyurethane is improved by approximately 60%. The hydrophilic porous polyurethane is convenient to process. Film forming speed of the modified porous polyurethane is improved, wherein film forming can be accomplished in 2-3 days. Compared to traditional water processing carriers, with the hydrophilic polyurethane porous carrier, film forming time is reduced, workload is reduced, and the preparation technology is simple. The hydrophilic polyurethane porous carrier can resist shock load.

The invention discloses phosphated lignin-based flame-retardant and reinforced rigid polyurethane foam and a preparation method thereof. The polyurethane foamed plastic is prepared by mixing, pouring and foaming 50-90 parts of bio-based polyhydric alcohols, 10-50 parts of phosphated lignin, 1-3 parts of amine catalyst, 0.05-0.2 part of tin catalyst, 0.5-2 parts of foam stabilizer, 100-140 parts of isocyanate and 4-7 parts of water. The activity of the lignin is improved through phosphorization modification, and formation of a crosslinking network of the polyurethane foam system is promoted, so that the mechanical property of the foam is improved, the utilization rate of the lignin in the polyurethane foam is increased, and the production cost of the polyurethane foam is reduced. In addition, an anhydrous phosphate solution in modified liquid directly serves as a flame retardant component and is uniformly dispersed in the polyurethane foam, and the heat release rate of the polyurethane foam is reduced, so that the polyurethane foam has high flame-retardant property.

The invention discloses modified polysulfone powder based on dopamine and a preparation method of a dopamine-modified polysulfone membrane. The preparation method of the dopamine-modified polysulfone powder comprises the steps that 1, autopolymerization of dopamine on the surface of polysulfone powder is conducted, and a generated polydopamine functional layer is adhered to the surface of the polysulfone powder; 2, the dopamine-modified polysulfone powder is prepared into the membrane through a solution phase-inversion membrane-forming method. The preparation method has the advantages that dopamine is adopted to modify membrane-forming material polysulfone, and then membrane forming is conducted so that the membrane structure can be flexibly and conveniently regulated and controlled according to the use demand; the prepared polysulfone membrane has the good hydrophilic property and anti-fouling performance and can be further subjected to functional modification; the membrane material is not damaged during modification, the physical and chemical properties of an original membrane are not sacrificed, the method is simple, the effect is good, energy conservation and environment friendliness are achieved, and the method is suitable for industrial production and application.

The invention relates to a preparation method for a selenide thin film modifying a foamed nickel electrode and an application thereof. The preparation method comprises the following steps that the foamed nickel electrode is subjected to surface treatment through hydrochloric acid and ethanol, a nickel oxide layer on the surface of the foamed nickel electrode is removed, and the clean and fresh metal surface is obtained; and after pretreating, the foamed nickel electrode is immersed into a mixed solution of a transition metal chloride, a sulfur group oxide and a supporting electrolyte, and the selenide thin film is deposited on the surface of the foamed nickel electrode through a electrochemical method. The selenide thin film obtained through the electrochemical deposition method is stable, catalytic precipitation of hydrolyzed oxygen can be realized; the foamed nickel electrode is of a multi-layer structure, the special three-dimensional porous structure, compared with another one-dimensional or two-dimensional substrate electrodes, has a richer surface area, the price is low, so that the industrial large-scale application is facilitated; and a thin film catalyst is promising in being used in the research field of water-electrolytic hydrogen making.

The invention relates to a method utilizing chitosan to compound hexadecylpyridine bromide to modify a glassy carbon electrode and synchronously determining dopamine and ascorbic acid, which belongs to the electrochemical analysis detection technical field. The invention is mainly to use chitosan to compound hexadecylpyridine bromide to drip on the glassy carbon electrode to modify the glassy carbon electrode to ensure that a layer of even thin-film is formed on the surface of the electrode, and further to improve the stability of the electrode. The preparation method of the compound modified agent obtained by the compounding of the chitosan and the hexadecylpyridine bromide is as follows: firstly, cetylpyridinium bromide water solution with percentage concentration by weight of between 5 and 10mM / L is prepared, then chitosan water solution with percentage concentration by weight of between 0.5 and 1.0 percent is prepared, then the cetylpyridinium bromide water solution and the chitosan water solution are mixed according to certain volume ratio, the volume ratio of the cetylpyridinium bromide water solution and the chitosan water solution is between 1:1 and 3:1, and the composite modified agent can be obtained after the mixture is stirred to fully and evenly mix. The method can be directly used for quick electrochemical determination of dopamine and ascorbic acid, and has the characteristics of quickness, sensitiveness, accuracy, high catalytic property and so on.

The invention discloses a heavy metal adsorbent and a preparation method and application thereof. The heavy metal adsorbent is prepared by modifying raw materials including attapulgite clay and microcrystalline cellulose, wherein the mass ratio of attapulgite clay to microcrystalline cellulose is (1-4) : 1, and attapulgite refers to aqueous magnesium-rich aluminosilicate mineral having the laminated chain structure. The heavy metal adsorbent is applied to preparation of adsorbent products for overcoming heavy metal pollution. Since attapulgite and microcrystalline cellulose are taken as the raw materials, cellulose is dissolved by an alkali / urea system, and attapulgite and calcium carbonate are added to prepare a porous attapulgite and cellulose composite adsorbent; the the modifying process needs mild condition without pollution, is easy to control and has high yield. Besides, the attapulgite and cellulose composite adsorbent is low in cost, environmental friendly, high in adsorptioncapacity, wide in service condition, and can be applied industrialized production.

The invention discloses a preparation method for an enzyme-modified peanut protein, which includes the following steps: low-denatured degreased peanut protein powder suspension is added into distilled water, and microwave-assisted dispersion and dissolution is carried out; the pH value is regulated, and microwave-assisted alkali extraction is carried out; after centrifugation, supernate is ultrafiltered, the pH value of concentrate is regulated, protease is added, and microwave-assisted enzymolysis is carried out; after enzyme inactivation, ultrafiltration, separation and concentration, concentrate is frozen and dried, and thereby the enzyme-modified peanut protein is obtained. The enzyme-modified peanut protein product prepared by the preparation method has good dissolvability, foamability and foam stability, and can be used for improving the processability of food. The preparation method has the advantages of mild enzyme modification conditions, short reaction time and low cost, andis suitable for industrialized production.

The invention relates to a composite nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: adding polyol, a binder, a surfactant and an alkaline agent into water, stirring and dissolving, to obtain an aqueous solution; adding an isocyanate monomer into an organic solvent, stirring and dissolving, to obtain an organic phase solution; soaking an ultrafiltration base membrane into the aqueous solution, then taking out and drying; soaking the dried the ultrafiltration base membrane into the organic phase solution for reacting, to obtain a prefinished nanofiltration membrane product; performing thermal treatment to the prefinished nanofiltration membrane product, to obtain the composite nanofiltration membrane. Therefore, the composite nanofiltration membrane prepared by using the preparation method has high retention rate and permeation flux. By adopting an interfacial polymerization mode, the operations are simplified compared with the prior art, the technology is easily controlled, and the defects that the thickness uniformity of an active layer is bad and the separation performance of the membrane is influenced by using coating and other modification methods can also be overcome.

A process for dispersing SiO2 nano-particles includes such steps as adding nano-class SiO2 sol into reactor, stirring while dripping Al(NO3)3íñ9H2O, regulating pH=7.5-8.0, reaction to coat Al(OH)3 on the surface of SiO2 nano-particle, washing with de-ionized water, drying, dissolving sodium dodecylphenylsulfonate in de-ionized water, adding said coated SiO2 nano-particles, regulating pH=6, and stirring while reacting to obtain Al(OH)3 coated and sodium dodecylphenylsulfonate modified SiO2 nano-particles. It can be used as the functional filler of plastic, rubber, paint, adhesive, etc.

The invention discloses freezing-resisting soybean protein isolate and a preparation method thereof, and belongs to the technical field of soyabean protein processing. According to the freezing-resisting soybean protein isolate and the preparation method, degreased soybean meal is taken as a raw material, and the freezing-resisting soybean protein isolate is prepared through processes of alkali dissolution, acid precipitation, redissolution, gelatin mixing, enzyme crosslinking, spray drying and the like. The soybean protein isolate can improve the gel texture or reduce deterioration of sensory quality of frozen foods due to frozen storage. According to the freezing-resisting soybean protein isolate, the water holding rate of protein gel can still be higher than 85% in one-month frozen storage period. According to the method, an enzyme crosslinking method is adopted for modifying the soybean protein isolate, the modification condition is mild, the process is simple, the operation is easy, the production time is short, complicated equipment is not required, the prominent realistic problem of related food quality deterioration caused by the fact that the water holding capacity of protein gel is reduced under the extreme low-temperature condition when soybean protein isolate is added and used into the frozen foods at presence is better solved, and the freezing-resisting soybean protein isolate has wide industrial application prospect.

The invention discloses a protein fiber reactive dye low-salt dyeing modification method and belongs to the technical field of modification of textile materials. The protein fiber reactive dye low-salt dyeing modification method comprises the following steps: immersing protein fiber into a buffer solution containing chitosan oligosaccharide, reacting at 80 to 90 DEG C for 45 to 60 minutes, takingout the protein fiber, washing the protein fiber with water, drying to obtain aminated protein fiber, and performing reactive dye low-salt dyeing on the aminated protein fiber. The invention providesa method for improving the dyeing property of the protein fiber on the reactive dye under the condition of low-salt concentration by performing cationic modification on the protein fiber by the chitosan oligosaccharide; compared with the unmodified wool, the dyeing percentage of the modified wool on the reactive dye and the K / S value are increased by 32 percent and 135 percent correspondingly. Compared with the traditional method, the method has the advantages that the chitosan oligosaccharide serves as a modifier and the modification condition is mild, non-toxic and easy to control; furthermore, the problems of chemical residues and environmental pollution caused by use of chemical reagents are avoided; and high practicability is achieved.

The invention discloses a wood fiber homogeneous phase transesterification modification method. Wood fibers are dissolved in an ionic liquid, transesterification agents are added to react with the wood fibers, and esterified modified wood fibers are obtained after deposition, washing, filtering and drying. The method is advantageous in that reaction conditions are mild, the technology is simple, the modification efficiency is high, the modification degree is easy to control, catalysts are not needed, products are easy to separate, no acidic by-products are generated during the reaction, degradation of wood fiber components cannot be caused, the employed ionic liquid can be recycled, and the wood fiber substitution degree is easy to control. The provided method has high practicality and good economic prospects.

A preparation method of a polydopamine modified tungsten-doped vanadium dioxide nanoparticle composite intelligent temperature control coating comprises the following steps: mixing a vanadium source solution containing a reducing agent with a tungsten source solution containing hydrogen peroxide, carrying out a hydrothermal reaction, drying the product, and carrying out high-temperature annealingtreatment to obtain tungsten-doped vanadium dioxide; and dispersing tungsten-doped vanadium dioxide in water, adding a buffer solution to adjust the pH value to 7.5-9.5, adding dopamine hydrochloridewith different mass ratios, and stirring to react, thereby obtaining the polydopamine-modified tungsten-doped vanadium dioxide nanoparticles. According to the preparation method disclosed by the invention, the polydopamine modified tungsten-doped vanadium dioxide nanoparticle composite intelligent temperature control coating which is high in purity, uniform in particle size distribution, high in photo-thermal conversion efficiency, good in biocompatibility, good in dispersity and strong in adhesion can be obtained.

The invention relates to a method for modifying glassy carbon electrode using semi-conductor nano material zinc sulphide and measuring dopamine ascorbic acid at the same time, which belongs to the field of electrochemical analysis and detection technique. The invention principally uses semi-conductor nano material zinc sulphide alcohol fluid dispersion to drop on the glassy carbon electrode, thereby modifying the glassy carbon electrode and improving stability of surface of glassy carbon electrode. The method provided by the invention uses nano zinc sulphide to modify glassy carbon electrode, which is used as a novel electrochemical sensor, and is good for rapid electrochemical determination of dopamine and ascorbic acid at the same time.

The invention discloses a high-water-absorbing carbon material under the low-humidity condition and a modification and preparation method thereof. The modification of the carbon material comprises the following steps of: adding ammonium persulfate into sulfuric acid solution and mixing uniformly, thus obtaining peroxosulfuric acid solution; adding the mixed solution into an active carbon material, heating, stirring, mixing uniformly, and carrying out surface-modification reaction; filtering and drying the obtained solution to prepare a high-water-absorbing carbon material absorbing agent under the low-humidity condition. The modification method uses easily available materials and is simple to carry out, mild in modification condition and lower in cost; and the water-absorbing capacity of the modified carbon material is high under the low-humidity condition.

The invention provides an ethylenediamine-modified peach kernel cationic adsorbent and a preparation method thereof. The preparation method comprises the following steps: crushing washed peach kernels, sieving to obtain powder with the particle size of 50-60 meshes, drying the powder for 24h at 90 DEG C in a drying box, washing for 1h by using sodium hydroxide with the concentration of 0.1 mol / L,washing by water till a neutral state, then drying at 50 DEG C in the drying box, then chemically etherifying the peach kernel powder by using epichlorohydrin, carrying out a reaction for 5h in an alkali epichlorohydrin solution while heating in a water bath with the temperature of 50 DEG C, washing by water till a neutral state is reached, drying overnight at 50 DEG C, finally modifying the etherified peach kernel powder by using ethylenediamine, washing by water till a neutral state is reached, then drying at 50 DEG C to obtain the modified peach kernel cationic adsorbent. Compared with other adsorbents, the ethylenediamine-modified peach kernel cationic adsorbent has the advantages of higher selectivity, a very high anionic pigment removing rate, large adsorption capacity and secondaryrecyclability; in addition, a peach kernel raw material is wide in source and low in price; the ethylenediamine-modified peach kernel cationic adsorbent can be applied to pigment wastewater treatmentin printing and dyeing, food processing and other industries.

The invention relates to an organic silicon nano particle modified electrode, a sensor piece and a preparation method of the electrode. The organic silicon nano particle modified electrode is an organic silicon nano particle electrode, wherein organic silicon nano particles are subjected to surface finish sulfydryl or amino functionalization. The organic silicon nano particle modified electrode is characterized in that a silane material containing an organo-functional group is utilized as a silicon source, and uniform superfine organic silicon nano particles are obtained with the existence of a surface active agent with a proper quantity under room temperature; and further, a uniform compact organic silicon nano particle film is formed on the surface of the electrode through using a normal position assembly or condensed method, and therefore, the organic silicon nano particle modified electrode with different functions is obtained. The invention also discloses the sensor piece assembled by adopting the modified electrode, and the sensor piece is used for detecting trace heavy metal. The organic silicon with the single function is adopted as the silicon source in the preparation, and therefore, the functional groups on a nano surface are rich; and as the nano particles are utilized as a sensing interface, the sensitivity response of analytes such as the trace heavy metal (Pb, Hg, Cu and the like) in the sensor is greatly improved.

The invention relates to a preparation method of an anti-freeze soy isolate protein. The preparation method comprises the following steps of: 1, modification: adding water into a soy isolate protein to dissolve the soy isolate protein into an 18 to 20% soy isolate protein solution, carrying out normal pressure heating under the condition of 85 to 95 DEG C for 15 to 20min, and adjusting the pH value to a neutral value to obtain modified soy isolate protein solution; 2, mixing: adding collagen hydrolysate and coconut meat extract which account for 5 to 15% of the total weight of the modified soy isolate protein solution into the modified soy isolate protein solution, uniformly stirring, shearing and homogenizing to obtain mixed solution; wherein the weight ratio of the collagen hydrolysate to the coconut meat extract is 2: 1; and 3, drying: carrying out normal pressure storage on the mixed solution under the condition of a water bath of 40 DEG C to 50 DEG C for 1 to 2 hours, after cooling to the room temperature, standing for 10 to 20 minutes, and carrying out spray drying to obtain the anti-freezing soy isolate protein. The preparation method provided by the invention is mild in modification condition, simple in process, easy to operate and short in production time, does not require complex equipment, and has the wide industrial application prospect.

The invention belongs to the field of renewable biomass resource development and utilization, and particularly relates to a method for preparing lignin-based phenolic resin by using nano lignin as a raw material. The method comprises the following step: (S2) adding formaldehyde into nano lignin or a mixture of the nano lignin and phenol, carrying out heating reaction in the presence of an alkalinesubstance, and cooling after the reaction is finished, wherein the alkaline substance used in the step S2 is alkali metal or alkaline earth metal salt. According to the preparation method disclosed by the invention, the nano lignin-based phenolic resin is effectively prepared through a simple preparation method, and various properties of the obtained nano lignin-based phenolic resin accord with the national standard GB / T 14732-2006.

The present invention discloses a dopamine-based modified polymer film and a preparation method thereof, and belongs to the field of environmental materials. The dopamine-modified polymer film preparation method comprises: (1) self-polymerizing dopamine on the surface of polymer powder, and adhering the generated poly dopamine function layer onto the surface of the polymer powder; and (2) preparing the film from the dopamine-modified polymer powder by using a solution phase conversion film forming method. According to the present invention, the film forming material is modified with dopamine and then the film is formed, such that the film structure can be controlled flexibly and conveniently according to the use need; the prepared film has good hydrophilicity and good pollution resistance, and can be further subjected to functionalized modification; the modification does not damage the film material, and does not sacrifice the physical and chemical properties of the original film; the method has advantages of simple process, good effect, energy saving and environmental protection; and the prepared film has good hydrophilicity and good pollution resistance, and is suitable for various film separation fields.

The invention relates to a method for modifying glassy carbon electrode using semi-conductor nano material zinc sulphide and measuring dopamine ascorbic acid at the same time, which belongs to the field of electrochemical analysis and detection technique. The invention principally uses semi-conductor nano material zinc sulphide alcohol fluid dispersion to drop on the glassy carbon electrode, thereby modifying the glassy carbon electrode and improving stability of surface of glassy carbon electrode. The method provided by the invention uses nano zinc sulphide to modify glassy carbon electrode,which is used as a novel electrochemical sensor, and is good for rapid electrochemical determination of dopamine and ascorbic acid at the same time.