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 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 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 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.

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 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.

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.