18results about How to "Modification method is simple" patented technology

The invention discloses a high-impermeability curing agent for sandy soil and a preparation method, the high-impermeability curing agent comprises the following components by mass: 30-50 parts of a solid waste-based sulfur aluminum iron series cementing material; 10 to 30 parts of slag powder; 5-30 parts of ordinary Portland cement; 5-20 parts of desulfurized gypsum; and 1-10 parts of silica fume. A curing agent system further strengthens the hydration effect and the cementing performance of the cementing material, and a formed crystal-colloid composite hydration product system contributes to the stable and compact microstructure of the cured sandy soil, so that the impermeability and the mechanical property of the sandy soil can be greatly improved; the comprehensive application of solid waste raw materials such as desulfurized gypsum and mineral powder is realized, and the stacking cost of solid wastes and the influence on the environment are reduced.

The invention relates to an antibacterial and hemostatic composite material and a preparation method thereof. The preparation method comprises the following steps: reacting exfoliated graphene oxide with KH560 at 60 DEG C to obtain coupled grafted graphene oxide EGO; then under the condition of intense stirring at 80 DEG C, enabling the kaolin nanotube to react with EGO (Ethylene Gallate Oxide), so as to obtain EGO-EK; and then reacting the chitosan solution with EGO-EK by using a cross-linking agent and a catalyst to obtain a uniform suspension, and freeze-drying. The hemostatic composite material disclosed by the invention has the advantages of bacterial infection resistance, difficulty in tissue adhesion with a wound surface, good mechanical property, photo-thermal effect, excellent biocompatibility and rapid hemostatic capability, and in addition, the hemostatic composite material can accelerate the healing of the bacterial infection wound surface.

The invention discloses a method for modifying hexagonal boron nitride by ozone. The method comprises the following steps: performing low-temperature heat treatment on hexagonal boron nitride, mixing with water to prepare slurry, introducing ozone for oxidation treatment, and finally modifying by using a surface modifier to obtain the modified hexagonal boron nitride. The modification method disclosed by the invention is simple, after modification, the flowability and binding property of the hexagonal boron nitride in a system are improved, and the requirements on the flowability and binding property of the hexagonal boron nitride in practical application are met.

The invention relates to the field of nanofiltration membranes, and discloses a modifier, a modification method of a pollution-resistant nanofiltration membrane, the pollution-resistant nanofiltration membrane and application of the pollution-resistant nanofiltration membrane, and the modifier comprises glycerin, polyphenol, a polyhydroxy polymer and a pH regulator. According to the present invention, the initial nanofiltration membrane is modified by the modifying agent with the specific components to obtain the pollution-resistant nanofiltration membrane, the pollution-resistant nanofiltration membrane has characteristics of high retention rate and strong surface hydrophilicity, can reduce the adsorption of the hydrophobic organic pollutants on the membrane surface, and can ensure the low water flux reduction rate during the long-time operation process, and after the polluted membrane is washed with water, the water flux reduction rate is low; and the water flux has a relatively high recovery rate.

The invention discloses a carbon network interface optimized sodium ion battery positive electrode material, which is characterized in that ferric sodium pyrophosphate is used as a base material of the positive electrode material, and a carbon nanotube is filled between the base materials; the surface of the ferric sodium pyrophosphate base material is coated with an amorphous carbon layer, and the carbon content of the sodium ion battery positive electrode material is 1%-10%; and the specific surface area of the sodium ion battery positive electrode material is 20-25m < 2 > / g. According to the invention, oleic acid and the like are used as main carbon sources, carbon nanotubes are introduced to be inserted among positive electrode material particles, a sol-gel method is adopted to synthesize a precursor, and a finely controlled sintering process is adopted, so that the sodium ion battery positive electrode material with large specific surface area, rich pores and uniform carbon coating is successfully prepared, and the sodium ion battery positive electrode material shows relatively large capacity. The material shows excellent conductivity and structural stability. Compared with the existing positive electrode material, the material provided by the invention has higher ionic conductivity, has the advantages of safety, environmental protection and low cost, is suitable for the technical field of electrochemical energy storage batteries, and has a wide application prospect.

The invention belongs to the field of catalyst preparation technology and application, and relates to preparation of a Pd / C catalyst and a method for synthesizing phenylacetic acid from benzyl chloride by using the Pd / C catalyst. The method comprises the following steps: S1, preparation of a Pd / C catalyst: preparing a high-dispersity, high-activity and stable catalyst by improving the process, obtaining a high conversion rate by only using 0.2% of the catalyst, and having excellent reusability; and S2, synthesizing phenylacetic acid: taking benzyl chloride and CO as raw materials, adding the prepared high-activity Pd / C catalyst, and optimizing a reaction process to obtain high-yield and high-purity phenylacetic acid. The prepared catalyst shows an excellent catalytic effect, the production method is simple in step and mild in reaction condition, the yield of the obtained phenylacetic acid is relatively high, the used solvent can be recycled, the cost is greatly saved, and the method is suitable for large-scale industrial production.

The invention relates to the technical field of drinking water treatment, in particular to high-catalytic-activity biochar, a preparation method and application of the high-catalytic-activity biochar to removal of pesticides in drinking water. The preparation method comprises the following steps: 1) removing roots of fresh water hyacinth, cleaning, drying, crushing and sieving to obtain fine and uniform powder; (2) putting the obtained powder into a sodium hydroxide solution, stirring, standing to obtain a solid, washing to be neutral, drying, and adding into pure water together with magnesium chloride; drying the solid obtained by solid-liquid separation, pyrolyzing in a tubular furnace, and cooling to room temperature; the preparation method comprises the following steps: grinding and sieving the raw materials, adding the raw materials into ethanol to form a dispersion liquid, and adding 3-aminopropyltriethoxysilane to carry out a functionalization reaction; and filtering the dispersion liquid after the functionalization reaction, washing the obtained solid, and drying to obtain the functionalized magnesium-modified water hyacinth-based biochar. The prepared charcoal activated peroxymonosulfate can be used for efficiently removing organic pesticides in drinking water.

The present application relates to a kind of anticoagulation, anti-oxidative stress hemodialysis apparatus and preparation method, belong to biomedical polymer and hemodialysis field.Oxygen-containing functional group carbon dots, anticoagulation monomer, initiator and crosslinking agent are added into water, to obtain modified liquid of anticoagulation and anti-oxidation;Protective gas is introduced into hemodialysis apparatus to remove oxygen, then modified liquid is introduced into dialysis apparatus, then sealing heating is carried out to initiate anticoagulation monomer in situ polymerization on the surface of dialysis membrane, and the oxygen-containing functional group carbon dots form gel microspheres under the wrapping of polymer, i.e., anticoagulation, anti-oxidative stress hemodialysis apparatus is obtained.The APTT of modified dialysis apparatus can reach 600s, and the removal rate of DPPH and ABTS free radicals is 71.25% and 97.47% respectively.The present application only needs to carry out one-step surface modification to dialysis apparatus finished product, which can give hemodialysis apparatus the dual functions of anticoagulation and anti-oxidative stress, is simple and convenient, and has good application prospect.

The invention discloses a hydrophobic and oleophobic dry powder extinguishing agent and a preparation method thereof. The method comprises the following steps: modifying the dry powder extinguishing agent by using a silane coupling agent in a solution through a sol-gel method to obtain a preliminarily modified dry powder extinguishing agent rich in silicon hydroxyl on the surface, and then adding the preliminarily modified dry powder extinguishing agent into a fluorine solvent containing long-chain perfluoropolyether silane for stirring modification to obtain the hydrophobic and oleophobic dry powder extinguishing agent. The preparation process is simple, and compared with a conventional hydrophobic and oleophobic dry powder extinguishing agent, the prepared hydrophobic and oleophobic dry powder extinguishing agent not only has hydrophobic and oleophobic effects, but also has the characteristics of no toxicity, harmlessness, environmental protection and degradability.

The invention provides a method for preparing modified carbon fibers, an offshore photovoltaic weather-resistant polyethylene master batch and an offshore photovoltaic floating body. The method for preparing the modified carbon fibers comprises the following steps: (1) carrying out surface treatment on the carbon fibers by using a vacuum plasma cleaning machine; (2) grinding a filling agent, and filtering through a screen to obtain filling agent powder; (3) mixing the filler powder with a silane coupling agent and a solvent, and performing ultrasonic dispersion to obtain an impregnation liquid; and (4) carrying out ultrasonic oscillation treatment on the surface activated carbon fiber in the impregnation liquid, and then carrying out vacuum drying to obtain the modified carbon fiber. Active groups such as hydroxyl and carboxyl are formed on the surfaces of the carbon fibers by adopting a plasma surface treatment technology, then a filler is adsorbed under the action of a silane coupling agent, part of the filler forms a sea-island structure at staggered sites of the fibers, and alkyl groups of the silane coupling agent face outwards, so that the compatibility of the carbon fibers and polyethylene resin is improved; the acting force between the modified carbon fiber and the polyethylene resin is larger, the combination is firmer, and the connection strength is higher.

The present invention discloses a chemical modification method for improving the heavy metal adsorption performance of loofah, comprising the steps of: (1) modifying the carboxyl group of the loofah pretreated with alkali solution and loading nano-alumina particles on the surface to achieve composite modification of the loofah and introduce double bonds to obtain Al 2 O 3 ‑loofah composite material; (2) through Al 2 O 3 The invention discloses a double-bond cross-linked grafted poly-4-vinylpyridine of a loofah composite material, and realizes cross-linking modification and functional modification of the loofah at the same time. The invention adopts two steps to complete the modification of the loofah, and the modification method is simple to operate, and can realize the effects of functional modification, composite modification and cross-linking modification of the loofah at the same time, thereby significantly improving the adsorption efficiency and capacity of the loofah for heavy metal ions.

The invention belongs to the technical field of batteries, and provides a carbon fluoride modification method, modified carbon fluoride and a lithium / carbon fluoride battery, and the modification method comprises the following steps: mixing a carbon fluoride material, acid anhydride and a solvent, and carrying out modification treatment to obtain the modified carbon fluoride. From the perspective of improving the stability of the carbon fluoride material, the solution system containing the anhydride compound is formed by using the anhydride and the solvent to modify the carbon fluoride material, and free fluorine and active fluorocarbon bonds in the carbon fluoride material are effectively removed, so that the stability of the carbon fluoride material is improved, and the service life of the carbon fluoride material is prolonged. The problem of side reaction between the carbon fluoride and the electrolyte is solved, so that the storage stability of the carbon fluoride battery is improved.

The invention discloses a lignin phenol modified adsorbent and a preparation method and application thereof, the preparation method comprises the following steps: adding an organic solvent into a mixture of phenol and lignin, uniformly mixing, and then evaporating to remove the organic solvent; the preparation method comprises the following steps: adding lignin into a reaction kettle, then adding a sulfuric acid solution to carry out phenolation reaction, after the reaction is finished, adding acetone to carry out cross-linking reaction for 0.5-12 hours, and during the cross-linking reaction, the addition amount of the acetone is 10-1000% of the mass of the lignin; and after the reaction is finished, carrying out solid-liquid separation, washing and drying to obtain the phenolated lignin. The prepared adsorbent has a good adsorption effect on various metal ions, and is especially suitable for treatment of industrial dye sewage. The heavy metal ion adsorption material also has the characteristic of good stability, and can be conveniently recovered and recycled from water.

An alkali metal modified titanium silicalite molecular sieve is characterized in that the molecular sieve contains titanium, silicon, oxygen and alkali metal elements, a Raman spectrum of a 325nm light source is used for characterizing that a titanium species signal peak exists in a range of 990cm <-1 > + / -20cm <-1 >, no obvious titanium species signal peak exists in a range of 1125cm <-1 > + / -20cm <-1 >, a molecular sieve skeleton structure signal peak exists in a range of 800cm <-1 > + / -20cm <-1 >, and the peak area is calculated as intensity. And the ratio I (90) / I (800) of the signal peak intensity of 990 + / -20 cm <-1 > to the signal peak intensity of 800 + / -20 cm <-1 > is (0.2-2): 1.

The invention discloses a covalent modification method of a high-performance lignin-based electrode material, and belongs to the technical field of biomass-based supercapacitors. The method specifically comprises the following steps: dissolving sulfate lignin in DMF (Dimethyl Formamide), adding a bifunctional reagent, and stirring for reaction; and after the reaction is finished, pouring the reaction liquid into deionized water in which hydrochloric acid is dropwise added, and carrying out anti-precipitation, filtration, drying, heat treatment, activation and other processes to obtain the covalent modified lignin. The modified lignin, a conductive agent and a binder are ground and mixed, a current collector is coated with the mixture and dried, and the lignin-based electrode is obtained. The covalent modification degree of the lignin is regulated and controlled by controlling the adding amount of the bifunctional reagent, modified lignin with different thermodynamic properties is obtained, and the purpose of regulating and controlling lignin derived carbon structure defects is achieved. The preparation method is controllable in scale and simple to operate, the obtained electrode material is few in defect structure and excellent in electrochemical performance, and a new theory and a new method are provided for development of the lignin-based electrode material.

The present invention belongs to the field of polymer material synthesis, and relates to an epoxy resin modified water-based acrylic resin dispersion and a preparation method. The epoxy resin modified water-based acrylic resin dispersion comprises the following raw materials: epoxy resin, diol, hydrophilic monomer, methacrylate glycidyl ether, tertiary amine catalyst, vinyl soft monomer, vinyl hard monomer, functional monomer, vinyl organosiloxane, solvent, initiator, neutralizer, chain transfer agent and deionized water. The water-based acrylic resin dispersion and its downstream product water-based acrylic industrial coating prepared by using the above monomers as raw materials and semi-continuous seed free radical polymerization process have the characteristics of good optical properties, fast drying speed, excellent water resistance and salt spray resistance, high hardness, etc. The product is green and environmentally friendly, with moderate cost, in line with the development trend of the industry, and has broad application prospects in the fields of electronic devices, optoelectronic materials, nano-composite materials, etc.

An alkali metal-modified titanium-silicon molecular sieve, characterized in that the molecular sieve contains titanium, silicon, oxygen, and alkali metal elements, and is characterized by Raman spectroscopy using a 325 nm light source, showing a value at 990±20 cm⁻¹. ‑1 A titanium species signal peak exists within the range, at 1125±20 cm⁻¹. ‑1 No obvious titanium species signal peak was observed within the range of 800±20 cm⁻¹. ‑1 A molecular sieve framework structure signal peak exists within the range, calculated with peak area as intensity, 990±20 cm⁻¹. ‑1 Signal peak intensity and 800±20cm ‑1 The ratio of signal peak intensity I(990) / I(800) is (0.2-2):1.

The invention relates to a modified carbon paper substrate and a gas diffusion electrode, the modification method is simple and convenient, the cost is low, the preparation is rapid, the method is suitable for various metal-based catalysts to prepare the gas diffusion electrode, the prepared gas diffusion electrode is good in hydrophobicity, the contact angle of the hydrophobic surface can reach 150 degrees or above, and the gas diffusion electrode has a good application prospect. And meanwhile, the hydrophobic layer does not cover active sites of the catalyst, so that good catalytic performance can be maintained, the common problems of water leakage and gas leakage of a gas diffusion electrode are solved, and current stability can be maintained under high current.