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53results about How to "Shorten modification time" patented technology

Method for electrochemically modifying surface of ultrasonic-enhanced carbon fiber

The invention provides a method for electrochemically modifying surface of ultrasonic-enhanced carbon fiber. The method comprises the following steps of: firstly, pretreating the surface of the carbon fiber material, secondarily, soaking the pretreated carbon fiber material into an electrolytic bath filled with strong electrolyte solution; and by taking the carbon fiber material as an electrochemically oxidized anode and graphite as an electrochemically oxidized cathode, guiding in current through control of a voltage-stabilizing power supply, wherein the current intensity is 1A/g-2A/g; and under the conditions of ultrasonic power of 200W-2000W, ultrasonic frequency of 20kHz-100kHz, and water bath temperature of 20 DEG C-70 DEG C, carrying out ultrasonic oscillation for three minutes to 15 minutes to produce surface modification, and finally washing and drying to obtain surface-modified carbon fiber. With the method, the surface roughness of the carbon fiber can be increased, the wetting property of the carbon fiber can also be improved due to introduction of polar group into the surface of the fiber, the binding property between the carbon fiber and a resin matrix can be enhanced, and the interface property of binding the carbon fiber with other materials can be increased.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Modified coal ash used for treating ammonia nitrogen waste water and preparation method thereof

The invention relates to modified coal ash used for treating ammonia nitrogen waste water, which is prepared by the following steps of: calcining NaOH and coal ash at a low temperature after NaOH and coal ash are uniformly mixed in proportion, cooling, grinding and sieving, then adding 1-5 times of water by weight, mixing, stirring, heating to the temperature of 70 DEG C and stopping stirring, gelling for 1.5-2 hours at constant temperature, then heating to the temperature of 100 DEG C, crystallizing for 3-4 hours at constant temperature, carrying out suction filtering, washing to be neutral with water, drying, cooling and then grinding and sieving, thus the modified coal ash is obtained. In the invention, NaOH low temperature calcining hydrothermal synthesis is adopted to modify the coal ash, the physical structure of the coal ash is destroyed, the modification time is shortened and a new zeolite mineral phase is generated under the condition of low alkali addition amount, the specific area of the coal ash is increased, and the cation exchange performance of the coal ash is improved. The modified coal ash provided by the invention is used for treating the ammonia nitrogen waste water, and the removing effect is obvious. By adopting the modified coal ash provided by the invention, wastes are treated with wastes, the resource utilization of wastes is realized, and the utilization factor of the coal ash is improved.
Owner:SHANXI UNIV

Surface modification method of carbon fibre plasma grafted carbon nano-tube

The invention provides a surface modification method of a carbon fibre plasma grafted carbon nano-tube, and the method comprises the following steps of: putting a carbon fibre material in the plasma atmosphere, wherein the power of a plasma generation device is 100-1000 W, and the processing time is 10-900 s; drying the processed carbon fibre material in vacuum at 40-60 DEG C to constant weight; then, adding amination carbon nano-tube into organic solution, and ultrasonically processing for 10-50 min to obtain sol solution with the concentration of 0.01-10 g / L; finally, adding the carbon fibre material into the carbon nano-tube sol solution, adding a surface active agent to mix, wherein the mass ratio of the surface active agent to the amination carbon nano-tube is 1:1, ultrasonically processing the obtained mixed solution for 10-50 minutes, increasing the temperature to 50-100 DEG C, carrying out constant-temperature reaction for 9-12 hours, and washing and drying. According to the invention, the carbon nano-tube is used as the surface grafting material of carbon fibre; the surface of carbon fibre is modified through plasma; a lot of polar groups are introduced into the surface of fibre, therefore, carbon fibre is grafted with the amination carbon nano-tube well; then, the carbon nano-tube well is grafted.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Composite material of shell micro powder filling bio-based resin and method for preparing same

ActiveCN101633775AImprove mechanical propertiesImproved Vicat softening temperatureChemical LinkageUltrasonic cavitation
The invention provides a composite material of shell micro powder filling bio-based resin and a method for preparing the same. The composite material comprises the following component in percentage by mass: (1) 20 to 60 percent of shell micro powder, 40 to 80 percent of bio-based resin, 1.5 to 8 percent of coupling agent and 0.2 to 0.4 percent of anti-oxidant; and or 20 to 60 percent of shell micro powder, 40 to 80 percent of bio-based resin, 0.6 to 3 percent of isocyanate, 0.05 to 0.1 percent of organic tin or organic stannous catalyst, and 0.2 to 0.4 percent of anti-oxidant. The invention also discloses a method for preparing the composite material. The method has the advantages of utilizing the ultrasonic cavitation to grind and disperse the shell micro powder, simultaneously accelerating the grafting or chemical bonding of the coupling agent or isocyanate on the surface of the shell micro powder, greatly shortening the modification time of the shell micro powder and the forming period of the composite material, and improving the interface compatibility and the bonding strength of the shell micro powder and the bio-based resin. The composite material is widely applied in fields of the production and consumption of automobile interior parts, stationery, road blocks, sporting goods, food bags, refuse bags, disposable tablecloth, outdoor flower pots, canteens, knives and forks and the like.
Owner:SHENZHEN HONGCAI NEW MATERIAL TECH

Method for improving activated carbon performances by self-assembling low-temperature plasma modification

The invention discloses a method for improving activated carbon performances by self-assembling low-temperature plasma modification, and belongs to the technical field of activated carbon modification. A self-assembling low-temperature plasma modification reaction device used in the invention mainly comprises a box body, a plasma generator, a gas distribution and exhaust gas treatment system, an auxiliary facility and the like. The activated carbon modification is taken as an aim, and the activated carbon modification is realized via four processes of activated carbon screening treatment, reactor detection and setting, activated carbon modification, and exhaust gas treatment. The method for improving the activated carbon performances by the self-assembling low-temperature plasma modification can effectively reduce the loss of activated carbon, shorten the modification time and improve the modification efficiency of the activated carbon, takes air as an air source which is cheap in price and easily obtained and is simple to operate, free of ozone dissipation and waste liquid to be treated, and environmentally friendly. The method for improving the activated carbon performances by the self-assembling low-temperature plasma modification can be widely used in the activated carbon modification, and further can be popularized and applied to the modification of adsorbents of kaolin and montmorillonite.
Owner:CHONGQING TECH & BUSINESS UNIV

Preparation method of amphiphilic silica flatting agent

The invention discloses a preparation method of an amphiphilic silica flatting agent. The method comprises the following steps: silica powder is placed into a mixer and heated under stirring to 60-200 DEG C, and stirring is kept; a silane treating agent accounting for 2%-30% by mass of the silica powder is uniformly sprayed into the mixer in an atomized manner and sufficiently mixed with the powder, the mixture is heated to 70-250 DEG C, stirred for 0.5-3 h at the temperature and dried finally, the temperature is controlled at 50-250 DEG C, discharging is performed after drying for 0.5-6 h, natural cooling is performed, and the amphiphilic silica flatting agent is obtained. The obtained amphiphilic silica flatting agent is enabled to have lipophilicity and hydrophilicity by controlling temperature and reaction time under conditions of addition in proper proportion, certain temperature, cyclic motion state of microparticles and the like, the flatting agent is good in stability and is not prone to layering or production of hard precipitates, so that waste of the flatting agent and paint is reduced, ultrafine particles of the silica flatting agent are well arranged and uniform in luster, the visual effect is good, the flatting efficiency is increased, and the flatting performance is improved greatly.
Owner:成都聚鸿轩化学原料有限公司

Method for improving silicon dioxide aerogel water phase dispersibility thorugh atomization absorption

The invention discloses a method for improving silicon dioxide aerogel water phase dispersibility through atomization absorption. The method comprises the following steps of fining and sieving silicon dioxide aerogel powder to obtain refined aerogel; atomizing organic solvents with the density being greater than the density of the water; forming a film coating reagent in a sealed container; uniformly dispersing the refined aerogel into a sealed container to form powder fog; adsorbing the film coating reagent by the powder fog to obtain coated aerogel; charging dispersing agent water solution into the bottom of a sealed container, wherein the sealed container is provided with a stirring device and an air blowing device; after the coated aerogel sinks down to the surface of the dispersing agent water solution, stirring and dispersing the coated aerogel with the density being greater than or equal to the density of the water into the water solution; blowing up the coated aerogel with the density being smaller than the density of water so that the coated aerogel is in contact with the film coating reagent again for adsorption. The method for improving silicon dioxide aerogel water phase dispersibility through atomization absorption provided by the invention has the advantages that the inherent structure and characteristics of the silicon dioxide aerogel are remained; the stable dispersion of the silicon dioxide aerogel in the water phase is realized; the work procedures are simple; the cost is low.
Owner:ECONANO TECH LTD BEIJING

A chemical modification method and device for microwave and ultrasonic co-treatment of carbon fiber surface

The invention discloses a chemical modification method and device for co-treating the surface of carbon fiber with microwave and ultrasonic. In the method, the carbon fiber is pretreated to remove the sizing agent in the carbon fiber; acidification treatment is carried out; the acidified carbon fiber is added to the chemical modification solution In the process, ultrasonic pre-dispersion, then adding reaction initiator, and carrying out microwave radiation, the chemical modification is completed. The device includes a water tank with a temperature control system, the water tank is provided with a cavity for chemical modification solution, the bottom of the water tank is provided with an ultrasonic generator, the upper part of the water tank is provided with a microwave-transmissible closing cover, and the upper part of the closing cover is provided There is a microwave generator. The invention has the advantages of low cost, simple operation, strong applicability, high efficiency, and excellent treatment effect. It can not only increase the surface roughness of carbon fibers, but also introduce specific reactive functional groups on the surface of carbon fibers, improve the wettability of carbon fiber surfaces, and increase the contact between carbon fibers and resins. The bonding strength improves the performance of carbon fiber composite materials.
Owner:XI AN JIAOTONG UNIV

Modification method of dietary fibers and product thereof

The invention belongs to the technical field of food processing, and relates to a modification method of dietary fibers. The modification method of the dietary fibers comprises the following steps: (1) uniformly mixing an extracted dietary fiber with distilled water so as to obtain a mixture, putting the mixture into subcritical water equipment so as to be subjected to processing at 105-160 DEG Cfor 10-60 minutes, carrying out concentration so as to obtain a concentrate, performing freeze-drying on the concentrate together with residues, and carrying out crushing so as to obtain a modified dietary fiber A; (2) adding distilled water into the modified dietary fiber A, adjusting the pH value to 3-8, and adding 0.1-1.0% of mixed enzymes composed of cellulase and xylanase so as to be subjected to enzymatic hydrolysis at 30-60 DEG C for 1-6 hours, thereby obtaining an enzymatic hydrolyzate; and (3) performing enzyme inactivation on the enzymatic hydrolyzate, and carrying out evaporating-concentrating, freeze-drying and crushing so as to obtain a modified dietary fiber B. The modification method of the dietary fibers disclosed by the invention is capable of significantly increasing content of soluble dietary fibers in total dietary fibers; and moreover, the obtained modified dietary fibers have significantly improved water-holding capacity, oil-holding capacity, expansive force, cholesterol adsorption capacity and nitrite ion adsorption capacity.
Owner:ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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