149results about How to "Change hydrophilicity" patented technology

The invention relates to a polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method, which comprises the following steps: adding nano TiO2 and SiO2 into a polyvinyl alcohol aqueous solution and stirring; carrying out ultrasonic mixing on a mixed liquor; placing the mixed solution in a reaction kettle after ultrasonic; heating, stirring and reacting at constant temperature; adding stearic acid-alcohol mixed solution and glutaraldehyde with the same temperature and stirring; and carrying out cross-linking reaction at a constant temperature; stirring and cooling to a room temperature after reaction, so as to prepare into a nano composite coating new material. With the adoption of the polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method, the nano TiO2 is adopted to modify a polyvinyl alcohol radical composite coating fresh keeping packaging material; the new material film formation moisture permeability is obviously reduced, and anti-bacteria fresh keeping performance of the packaging material is obviously improved.

The invention relates to a polyvinylidene fluoride/organic clay nano composite ultralow pressure ultrafiltration membrane and a preparation method thereof, and to a nano composite membrane and a preparation method thereof. The invention resolves the problem that the existing membrane material has a bad hydrophilicity and a low surface energy and is easily be polluted, and the existing modified method has the disadvantage that it can not run under ultralow pressure and the running cost is high. It is composed of 20-50 shares by weight of PVDF, 0.1-20 shares by weight of organic clay, 10-1000 shares by weight of disperse medium, 10-50 shares by weight of organic addition agent and 0.1-30 shares by weight of inorganic additive. The invention adds the organic clay, inorganic additive, organic addition agent and PVDF in turns into the disperse medium to get the casting film liquor after 3-48 hours dissolution and 5-24 hours stewing deaeration; plate membrane, tubular type membrane, hollow fibre membrane, and comparable membrane module can be prepared. The invention can change the hydrophilicity of the composite membrane, resolve the pollution of exiting membrane effectively, increase the water flux and retain ratio, extend the washing period, raise the treating capacity, and realize the large scale use and run in ultralow pressure.

The present invention relates to a building material additive with the fanction of automatically regulating humidity, belonging to the separation field of gas or steam. Its composition contains (by weight portion) 10-70 portions of sepiolite family minerals, 2-40 portions of wood fibre, 5-40 portions of compound phosphate, 0.1-10 portions of cellulose, 2-10.5 portions of active carbon, 0-3 portions of inorganic antibacterial agent and 0-3 portions of mildew-resisting agent, and its preparation method includes the following steps: pickling sepiolite family minerals, activating and mixing all the components, making slurry, forming, roasting and breaking, etc. Said invented additive can be added into various building materials, and can effectively improve indoor environment air quality.

The invention discloses a pH (potential of hydrogen) responsive metal organic framework nanometer crystal, a preparation method and application. The pH responsive metal organic framework nanometer crystal comprises a metal organic framework and a pH responsive segment, wherein the pH responsive segment is graftedadhered to an organic ligand of the metal organic framework, and can be a pH responsive polymer, a chain segment containing a carboxylic group, or a chain segment containing a pyridine group. The pH responsive metal organic framework nanometer crystal has the advantages that the pH responsive segment is grafted onto the organic ligand of the metal organic framework, so that the contact angle of the metal organic framework is changed, namely that the hydrophilicity and hydrophobicity properties of the metal organic framework are changed, thereby increasing the interface activity of the pH responsive metal organic framework; the pH responsive segment has response property to the change of the pH value of the surrounding environment, the pH responsive metal organic framework has different hydrophilicity and hydrophobicity properties under different pH values, and then the pH responsive metal organic framework can be separated and recycled by adjusting the pH value.

A preparation method of polymer/Mengtuotu composite hydrophilic membrane relates to preparation craft of composite membrane disposed by water. The step is: Dissolving polymer and organic Mengtuotu respectively in medium of 30 Deg. to 95 Deg. C for 3 to 20 hours; Mixing the admixture for 1 to 20 hours; Add organic matter and inorganic matter and mixing for 5 to 24 hours, it becomes cast-iron liquid; Make membrane. The present invention makes use of high surface energy of Nami Mengtuotu particulate to counteract the disfigurement the low surface energy of polymer. The changeable character of Nami Mengtuotu is different from others; it not only changes hydrophilic character of composite pottery but also changes hydrophilic character in interface of inner hole. The present invention can solve the membrane pollution problem effectively, increases flowing and sectional flowing rate, prolongs the cycle of cleaning and can be applied on a large scale.

The invention discloses an asparaginase mutant with enhanced enzyme activity, and belongs to the field of enzyme engineering. According to the asparaginase mutant, hydrophilic amino acid asparaginate and valine which are contained in an asparaginase molecule are mutated into tyrosine, tryptophan and isoleucine which have high hydrophobicity in a site-specific mutagenesis mode, so that the hydrophobicity inside the asparaginase molecule is changed, the enzyme activity, which is expressed by a strain, of asparaginase is remarkably improved, and the enzyme activity of the asparaginase is enhanced by 2.57 times. The improved strain is remarkably enhanced in enzyme producing capacity, more suitable for industrial application, reduced in production cost and improved in production efficiency.

The invention relates to the technical field of kaolin preparation, and particularly relates to a preparation method of kaolin having a high colloid index. The preparation method comprises the following steps: (1) pulping, and dispersing; (2) desanding; (3) blanching; (4) modifying with ammonia water: adding ammonia water of which the concentration is 10-29% in percentage by mass into the ore pulp concentrated material, and then thoroughly stirring for 15-25 minutes, wherein 0.1-0.35 kg of ammonia water is added into per ton of ore pulp concentrated material; and (5) washing and drying: circularly washing and dewatering the ore pulp concentrated material subjected to ammonia water modification in the step (4), and drying the washed and dewatered ore pulp concentrated material to obtain the kaolin having a high colloid index. According to the invention, the ammonia water is added into the ore pulp concentrated material to perform modification treatment, so that the hydrophilicity, dispersity and expandability of kaolin can be changed, thereby ensuring that the colloid index of the finally prepared kaolin is higher than 90ml/15g. Thus, the prepared kaolin is especially suitable for being used as a catalyst for catalytic cracking reaction in the petrochemical industry.

The invention discloses a technique for treating fermentation wastewater by a microbial fuel cell, and relates to a technique for treating wastewater. The method comprises the steps as follows: with conductive glass, carbon cloth or a carbon felt as electrode materials, active groups, polyelectrolyte multilayer films or nanoparticles/polyelectrolyte multilayer films are respectively modified on the electrode materials by an alkaline hydrolysis method, an acid hydrolysis method and a layer-by-layer self-assembly technique; the series materials are applied to an anode of a microbial fuel cell reaction device to treat the fermentation wastewater; with sodium acetate and lotus pond sludge as substrates, a microbial fuel cell system with a relatively high electricity generating rate, relatively good chemical oxygen demand (COD) removal effects and relatively high coulombic efficiency is obtained. The microbial fuel cell system is good in process repeatability, safe and reliable; the fermentation wastewater is treated; meanwhile, a relatively high electricity generating quantity and a relatively high electricity generating rate are achieved; the problems that the traditional microbial fuel cell is low in electricity generating efficiency and low in sewage COD removal rate are effectively solved; and the technique has a good industrial application prospect.

The invention relates to a preparation method of oxidized graphite fluoride and belongs to the technical field of functionalization of materials. The preparation method comprises the following steps: 1) carrying out backflow pre-treatment on a graphite fluoride raw material; 2) carrying out ultrasonic treatment on a graphite fluoride solution; 3) carrying out suction filtering and drying on the graphite fluoride solution to obtain an initial intermedium graphite fluoride with carbon atoms naked at the edge; 4) carrying out oxidization modification on the graphite fluoride with carbon atoms naked at the edge; 5) carrying out suction filtering and drying to obtain the final product oxidized graphite fluoride. The oxidized graphite fluoride with surface functionalization provided by the invention has a grain size smaller than that of the raw material and fewer layers, and has few stably existing oxidizing groups (-COOH, -OH and -O-) on the surface and at the edge, so that oleophylic, hydrophilic and amphiphilic functionalized oxidized graphite fluoride modified in different manners is obtained so as to adapt to different dispersing systems.

The invention discloses a waste drilling mud treatment method. Aiming at the characteristics that waste drilling mud contains a lot of drillings powder and is relatively high in soluble salt content, barite is primarily separated out by using a flotation separation method; the floated barite is further subjected to surface modification, so that the barite completely adapts to re-configuration of the drilling mud; and the drillings generated in the barite separation process are mixed with waste liquid sludge, and then are re-injected into stratum after being ground. The method disclosed by the invention has the characteristics of environmental friendliness and good economic benefits.

The invention relates to a demulsification purifying agent and is characterized in that the purifying agent is composed by the components and proportions: 2-68 percent of sewage purifier, 2-37 percent of polymeric ferric sulfate, 5-45 percent of aluminum polychlorid, 6-57 percent of calcium chloride, and 19-47 percent of ferric chloride. The preparation steps are that: sewage purifier, polymeric ferric sulfate and aluminum polychlorid are dumped into a mixer and then calcium chloride and last water of 50 percent of the four raw materials are added; the mixture is stirred fully at a rate of 60 rpm for two to three hours to ensure the solid components are completely dissolved; the ferric chloride is added and the mixture is mixed continuously but at a rate of 50-80 rpm for half an hour to one hour; the mixture is filtered and packed into package buckles after the mixer is stopped for six to ten hours. The invention has excellent sewage treatment effect with low investment.

The invention discloses a graphene composite aluminium oxide ceramic nano-filtration membrane, a filter, and a preparation method and application thereof. The nano-composite filtration membrane comprises an aluminium oxide ceramic membrane and a graphene layer which is positioned on at least one side surface of the aluminium oxide ceramic membrane; the pore size of the nano-composite filtration membrane is about 1 to 2 nm. The nano-composite filtration membrane provided by the invention has high hydrophobicity, high flux and high retention rate; moreover, the pores of the membrane cannot be blocked; water molecules can be effectively retained; the nano-composite filtration membrane is fouling resistant and easy to clean. The filter prepared by the filtration membrane is particularly suitable for separating water from ethyl alcohol; in addition, the preparation method of the nano-composite filtration membrane provided by the invention is easy to operate, convenient and practical.

The invention discloses a graphene nano composite material with dual intelligent responsivities. The graphene nano composite material is the polymer poly-RGO (reduced graphene oxide). The preparation method comprises the following steps: under the action of an azodiisobutyronitrile thermal initiator, carrying out polymerization on an ion monomer 1-vinyl-3-ethyl imidazole bromide and an N-isopropyl acrylamide monomer by using methanol as a reflux solvent to generate the polymer poly; and preparing the end polymerisate poly-RGO under the pi-pi non-covalent modification action between the graphene and ionic liquid. The graphene nano composite material prepared by the method has favorable dispersity, and is endowed with the dual intelligent responsivities of temperature sensitiveness and ionicity when the graphene reaches higher reduced state; and thus, the graphene composite material has certain environment responsivity on the basis of enhancing the original basic properties, thereby widening the applicability of the graphene nano composite material in the fields of biological transduction, electronic devices, separation purification and the like.

The invention discloses a reverse non-viral vector gene transfection method which comprises the following steps: (1) leading water solution of a polymer compound to be in contact with a cell culture vessel or a biological material cell culture support, removing liquid after incubation and preparing the surface modified cell culture vessel or the surface modified biological material; (2) mixing a non-viral vector with genes, and preparing a compound of the non-viral vector and the genes; and (3) dripping the compound of the non-viral vector and the genes into the surface modified cell culture vessel or the surface modified biological material, further adding cells to be transfected after the incubation and carrying out the gene transfection. The method has the advantages of simple operation and low cost, and can significantly improve the gene transfection efficiency of the non-viral vector under the situation that serum exists and control the release of the gene compound.

The invention relates to roadbase mixture prepared from municipal sludge resourcefully treated by a dedicated soil stabilizer. The roadbase mixture is prepared from the materials of 100 weight parts of initial mixture, 3 to 8 weight parts of cement and 0.01 to 0.1 weight part of the soil stabilizer; the initial mixture is prepared from 100 weight parts of municipal wet sludge, 15 to 20 weight parts of quicklime and solid waste; the soil stabilizer is prepared from 100 weight parts of water, 1 to 15 weight parts of surface active agent and 0.1 to 10 weight parts of boric acid or borate. The use amount of the solid waste is 7 to 13 times of the total volume of the mixed municipal wet sludge and the quicklime. The roadbase mixture has very good compressive strength.

The invention discloses a preparation method of titanium dioxide for decorative laminated paper with high retention rate, and belongs to the technical field of titanium dioxide production. The invention firstly uses aluminum sulfate octadecahydrate as a raw material, controls the precipitation morphology through ammonia water, and obtains nano-flaky alumina, which is modified by tin tetrachloride, a silane coupling agent and the like and used as a template, and then titanium tetrachloride is used as a template. As a titanium source, the nano-sheet alumina is coated, and then the aluminum phosphate layer and the alumina layer are sequentially coated to obtain a mixed solution of re-coated titanium dioxide. The titanium dioxide for decorative laminated paper with high retention rate can be obtained by grinding. The titanium dioxide prepared by the invention can improve the light resistance, dispersibility and hiding power of the titanium dioxide in the laminated paper very well, and can meet the requirements of titanium dioxide for laminated paper. requirements.

The invention provides a regenerated sludge muck brick and a preparation method thereof. The regenerated sludge muck brick is prepared from the following raw materials in parts by weight: 50-90 parts of soil, 5-45 parts of aggregate, 5-30 parts of cement and 1-20 parts of a soil stabilizer, wherein all the raw materials are scientifically proportioned, the regenerated sludge muck brick is obtained through stirring, aging, mixing, pressing, soaking and curing, the average density of the prepared regenerated sludge muck brick is 4.26 g/cm<3>, the initial setting time is 116min, the compressive strength is 23.69MPa, the breaking strength is 12.64MPa, and the water absorption rate of a single block is 10.1%.

The invention belongs to the field of ultra-filtration materials and particularly relates to a nano TiO2-modified PEO/PVDF composite ultra-filtration membrane. The nano TiO2-modified PEO/PVDF composite ultra-filtration membrane is characterized by being prepared through mixing nano TiO2 particles, nano PEO particles and a PVDF powder according to a certain ratio to prepare a solution and applying an electro-spinning method. The preparation method comprises the following steps: preparing dichloromethane, acetone and N, N-dimethylacetamide into a mixed solvent, then adding the nano PEO particles and uniformly stirring to obtain a mixed solution; then adding the PVDF powder, stirring at a constant temperature till PVDF is completely dissolved, adding the nano TiO2 particles, continuously stirring, standing and swelling to obtain a blended spinning solution; performing electrostatic spinning and heat treatment. The nano TiO2-modified PEO/PVDF composite ultra-filtration membrane provided by the invention can effectively solve the problems of low water flux, strong hydrophobicity and weak pollution resistance of an existing PVDF ultra-filtration membrane.

The present invention improves a traditional flotation separation beneficiation method by directing to a feature that waste drilling mud contains a large amount of drilling cutting power and a high content of soluble salt. By adjusting pH value of waste liquid and optimizing a flotation additive, the flotation efficiency can be improved. By using the method provided by the present invention, cost is low, and the purity of recovered barite can reach more than 90%, so that the recovered barite can be re-used in the preparation of the drilling mud.