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112results about How to "Uniform system" patented technology

Amino-protected crosslinking magnetic chitosan composite adsorbent and preparation method thereof

The invention relates to an amino-protected crosslinking magnetic chitosan composite adsorbent and a preparation method of the amino-protected crosslinking magnetic chitosan composite adsorbent. The preparation method comprises the following steps: enabling formaldehyde and amino on the chitosan to react to generate Schiff's base protected amino; crosslinking by using epichlorohydrin; and finally, carrying out acidolysis to remove the Schiff's base to recover the amino to obtain the amino-protected crosslinking magnetic chitosan composite adsorbent. The amino-protected crosslinking magnetic chitosan composite adsorbent comprises a magnetic chitosan and probably comprises a high molecular compound and / or an inorganic material. The amino-protected crosslinking magnetic chitosan composite adsorbent has the characteristics that the preparation process of the composite adsorbent is simpler, and the process parameters are easy to control; the adsorption capacity and the adsorption speed of the composite adsorbent are large and high, and the composite adsorbent can be recovered through an external magnetic field, so the reusability of the composite adsorbent is good. The composite adsorbent can be hopefully used for treating waste water containing heavy metal ions, protein and dye.
Owner:WUHAN UNIV

Nano-zinc oxide/acrylic ester grafting composite emulsion and preparation thereof

InactiveCN101372527AUniform particle sizeImprove coating efficiency and grafting rateNano zinc oxideNanometre
The invention relates to the manufacturing field of nano composite emulsion materials, in particular to graft nano zinc oxide/polyacrylate composite emulsion and a manufacturing method thereof. Firstly an initiator azobisisovaleric acid is anchored on the surface of nano zinc oxide particles, two portions of hexadecane are added to 100 portions of mixed monomers, and 5 portions of nano ZnO particles anchoring the azo initiator are added and ultrasonically oscillated for 20 minutes to form an oil phase pre-dispersion solution. The pre-dispersion solution is added to an emulsifier aqueous solution and dispersed by a high-shear dispersion homogenizer at high speed for 30 minutes to form a mini-emulsion. The mini-emulsion is transferred to a reactor, heated to the temperature of 75 DEG C, with polyreaction initiated for 3 hours, and then heated to the temperature of 85 DEG C, polymerized for 2 hours, cooled to room temperature and discharged. The invention solves the problems of high cost and poor stability of the nano composite emulsion prepared by coupling agents, and low encapsulation efficiency and graft ratio of nano polymer composite particles. The composite emulsion has the advantages of simple preparation process, low cost, even particle size, good performance, high encapsulation efficiency and graft ratio of the nano-particles, forms nano monodisperse state in the polymer, and is suitable for the fields of coating materials, leather finishing materials, adhesives and functional plastics.
Owner:HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY

Polyaluminium chloride e-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof

The invention discloses a PAC-PDMDAAC compound coagulant, a corresponding preparation method and an application method. The PAC-PDMDAAC compound coagulant is prepared as the following steps: the PAC dry powder or solution is arranged in a mixing reactor, and water is added to obtain a PAC solution which is stirred under normal temperature and a PDMDAAC colloid is added into the solution; the mixed solution is stirred under normal temperature till the PDMDAAC colloid is completely dissolved to obtain a stable PAC-PDMDAAC. The application of the PAC-PDMDAAC compound coagulant is to adopt the PAC-PDMDAAC compound coagulant for the coagulation treatment to raw water and waste water and sewage and the dehydration treatment to sludge or silt directly or after dilution with water by any proportion. The component structure and content scope of the invention are distinct to guarantee the capability and stability of the obtained PAC-PDMDAAC compound coagulant, and the materials on industrial manufacturing are available. The various functions of the PAC-PDMDAAC compound coagulant can be adjusted during water treatment with high adaptability so as to reduce cost, reinforce coagulation effect and dramatically enhance the quality of obtained water.
Owner:NANJING UNIV OF SCI & TECH

Polymeric ferric sulfate-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof

The invention discloses a PFS-PDMDAAC compound coagulant, a corresponding preparation method and an application method. The PFS-PDMDAAC compound coagulant is prepared as the following steps: the PFS dry powder or solution is arranged in a mixing reactor, and water is added to obtain a ferric-salt PFS solution which is stirred under normal temperature and a PDMDAAC colloid is added into the solution; the mixed solution is stirred under normal temperature till the PDMDAAC colloid is completely dissolved to obtain a stable PFS-PDMDAAC. The application of the PFS-PDMDAAC compound coagulant is to adopt the PFS-PDMDAAC compound coagulant for the coagulation treatment to raw water and waste water and sewage and the dehydration treatment to sludge or silt directly or after dilution with water by any proportion. The component structure and content scope of the invention are distinct to guarantee the capability and stability of the obtained PFS-PDMDAAC compound coagulant, and the materials on industrial manufacturing are available. The various functions of the PFS-PDMDAAC compound coagulant can be adjusted during water treatment with high adaptability so as to reduce cost, reinforce coagulation effect and dramatically enhance the quality of obtained water.
Owner:NANJING UNIV OF SCI & TECH

Method for preparing titanium dioxide pigment with high-temperature resistance

The invention discloses a method for preparing a titanium dioxide pigment with high-temperature resistance. The method comprises that: blending a primary titanium dioxide product into slurry by using distilled water or deionized water; regulating the slurry with pH value from 8 to 11 by using an alkaline solution; adding a dispersant, then performing a sand milling and filtering; heating the filtered slurry to the temperature of 50 DEG C to 75 DEG C and keeping the temperature unchanged in the whole process of coating; adding a sodium silicate aqueous solution, adding an acid solution for regulating the slurry with pH value of 8 to 11 and keeping the pH value unchanged; adding the acid solution to regulate the pH value of 2 to 7, then slaking; adding an aluminum salt aqueous solution, cocurrenting the acid solution or the alkaline solution for keeping the pH value unchanged, uniformly stirring after dropping; adding the alkaline solution to regulate the pH value of 6 to 8, then filtering, washing and drying after stirring, crushing by air flow and performing an organically treatment. According to the invention, the titanium dioxide pigment has the advantages of high temperature tolerance, good whiteness and good dispersibility. The method for preparing the titanium dioxide pigment with high-temperature resistance of the present invention has the advantages of good controllability, strong operability, low energy consumption and easy industrialization.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1

Oxidation resistant dimethyl silicon oil based magnetic fluid and preparation method thereof

The invention provides oxidation resistant dimethyl silicon oil based magnetic fluid and a preparation method thereof; the dimethyl silicon oil based magnetic fluid is prepared by nano-magnetic particles, a surface modifier and carrier fluid, and the carrier fluid is the dimethyl silicon oil. The preparation method of the dimethyl silicon oil based magnetic fluid comprises the following steps: preparing the nano-magnetic particles; treating the nano-magnetic particles in an activated way; preparing the nano-magnetic particles which are modified by the surface modifier; adding the modified nano-magnetic particles which are purified into methylene dichloride, dispersing and filtering the mixture to obtain the methylene dichloride based magnetic fluid; adding the magnetic fluid into the dimethyl silicon oil to be stirred and dispersed, heating the mixture and maintaining the temperature between 50 and 90 DEG C, separating and precipitating the mixture to obtain the dimethyl silicon oil based magnetic fluid. The dimethyl silicon oil based magnetic fluid in the invention has the advantages of high stability, low temperature resistance and high temperature resistance. The preparation method is simple, high in efficiency and low in requirement on equipments, thus being easy to be applied in various fields and having wide application prospect.
Owner:SUN YAT SEN UNIV

Chip-level bottom filling adhesive and preparation method thereof

The invention relates to a chip-level bottom filling adhesive, which comprises following components by weight percentage: 15 to 50 percent of epoxy resin, 1 to 20 percent of toughening agent, 0.1 to 1 percent of dispersing agent, 0.01 to 1 percent of defoaming agent, 0.8 to 10 percent of cross-linking agent, 0.1 to 0.5 percent of pigment, 40 to 70 percent of filler, 3 to 30 percent of curing agent and 1 to 20 percent of diluting agent. A preparation method of the chip-level bottom filling adhesive comprises the steps that the epoxy resin, toughened resin, the dispersing agent, the defoaming agent, the cross-linking agent and the pigment are weighed according to the proportion, thrown into reaction kettle and mixed to form a homogeneous solution; and afterwards, the filler, the curing agent and the diluting agent are weighed according to the proportion, thrown into the reaction kettle in sequence and evenly mixed with the homogeneous solution, and then the chip-level bottom filling adhesive is obtained. The bottom filling adhesive prepared by adopting the method has the characteristics of low curing shrinkage rate, high reliability, and the like, simultaneously satisfies the requirement of low radioactivity and is suitable for primary high-density packaging of memory chips.
Owner:YANTAI DARBOND TECH

Leaking stoppage reinforcing agent

The invention discloses a leaking stoppage reinforcing agent which comprises the following components in parts by weight: 2-8 parts of urea resin, 1-5 parts of phenolic resin, 8-15 parts of slag, 1-5 parts of calcium sulfate, 5-8 parts of aluminum oxide, 3-6 parts of calcium chloride, 10-20 parts of calcium carbonate, 10-20 parts of silicon oxide, 0.1-0.4 part of polyanionic cellulose PAC-LV and 0.1-0.4 part of sodium carboxymethylcellulose CMC-LV. The leaking stoppage reinforcing agent is prepared by the steps of sequentially adding the components in parts by weight into a reaction kettle according to a conventional preparation method at 30-50 DEG C under normal pressure, stirring and mixing for 6-8 hours, subsequently adding the components into a kneading machine, uniformly mixing and stirring, drying, and crushing into a powder product with the particle size of 0.01-0.5mm. The leaking stoppage reinforcing agent has a remarkable leaking stoppage and reinforcing effect, is temperature resisting, good in stability and coagulability, high in structural stoppage capability and good in compatibility, can be thickened without solidification, is controllable in reinforcing time, wide in application range, safe in construction and free of toxicity or pollution, can be widely applied to petroleum and geological drilling process, and is particularly applicable to leaking stoppage construction in large cracks, large karst caves, underground rivers, severe deficit earth layers and crushed earth layers.
Owner:DONGYING TAIER GASOLINE TECH

Polyaluminum sulfate-branched poly(dimethyl diallyl ammonium chloride) composite coagulant and preparation method and application method thereof

The invention discloses a polyaluminum sulfate-branched poly (dimethyl diallyl ammonium chloride) composite coagulant and a preparation method and an application method thereof. The preparation method comprises the following steps: the step 1: aluminum sulfate (AS) dry powders or liquids, which meet the requirements for national chemical industry standards, are loaded to a mixing reactor, water is added to make an aluminum sulfate (AS) solution, the aluminum sulfate (AS) solution is stirred while an alkali or an alkaline earth metal compound or an active aluminum hydroxide is added dropwise to allow a polymerization reaction, the pH value or the alkalization degree is controlled, the materials are not added when the pH value exceeds a preset value, the insoluble substances are filtered off after the reaction carries out for a certain time period, and a transparent polyaluminum sulfate (PAS) solution is prepared; the step 2: the polyaluminum sulfate (PAS) solution is loaded to another mixing reactor, and branched poly(dimethyl diallyl ammonium chloride) (PDMDAAC) colloids or dry powders are added at a room temperature or under a heating condition; and the step 3: the mixed liquid is stirred under room temperature until branched PDMDAAC colloids are thoroughly dissolved, so as to obtain the final product. The final product of polyaluminum sulfate-branched poly (dimethyl diallyl ammonium chloride) composite coagulant is applied to the flocculation treatment of waste water and sewage.
Owner:NANJING UNIV OF SCI & TECH

Air-pressure-adjustable bacteriological incubator

PendingCN107012088AAchieve trainingFacilitate the study of the relationship between growthBioreactor/fermenter combinationsBiological substance pretreatmentsNitrogen gasIncubator
The invention discloses an air-pressure-adjustable bacteriological incubator which comprises an incubator body. A lower swinging tray and an upper swinging tray are movably mounted in the incubator body, fixing grooves are formed in the upper swinging tray and the lower swinging tray, the upper swinging tray is connected with the lower swinging tray through a linkage rod, an air pressure adjusting cavity is formed in the side wall of the incubator body, the side wall of the air pressure adjusting cavity is communicated with the inside of the incubator body through a through hole, a piston is assembled in the air pressure adjusting cavity, a piston rod is connected on the piston, and one end of the piston rod penetrates the top surface of the air pressure adjusting cavity and is connected with a linear driving mechanism arranged on the side surface of the air pressure adjusting cavity. According to the bacteriological incubator, the air pressure in the incubator can be adjusted within a certain ranges according to practical experiment requirements by the aid of the air pressure adjusting cavity, so that relationships between the air pressure and bacterium growth are conveniently researched. According to the bacteriological incubator, carbon dioxide, nitrogen, oxygen, temperature and humidity can be adjusted, so that experimental research can be performed under multi-parameter conditions.
Owner:GENERAL HOSPITAL OF PLA

High-adhesiveness phenol aldehyde composite adhesive and preparation method thereof

The invention belongs to the field of preparation of high-performance high polymer materials, and relates to a preparation method of a novel composite adhesive product, particularly a method for preparing a phenol aldehyde composite adhesive from an ionic liquid and a phenol aldehyde resin prepolymer by in-situ blending. The preparation method comprises the following steps: firstly synthesizing a phenol aldehyde resin prepolymer from raw materials phenol and formaldehyde in the presence of an alkali catalyst; by using an imidazole polyether ionic liquid with characteristic group as a modifier, heating, stirring under reflux, carrying out stage heating and temperature control, dehydrating under reduced pressure and the like to obtain the phenol aldehyde composite adhesive containing the imidazole polyether ionic liquid structure; and adding ethanol to regulate the viscosity of the composite adhesive to obtain the alcohol-soluble phenol aldehyde composite adhesive with acceptable viscosity. The method can further enhance the binding property and curing property of the phenol aldehyde adhesive, lower the free aldehyde content, and effectively solve the problems of low heat stability, deep color, high cracking tendency and the like in the phenol aldehyde adhesive.
Owner:SHENYANG POLYTECHNIC UNIV

Polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof

The invention discloses a polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof. The preparation and application methods comprise the steps of: putting PAC (Poly Aluminium Chloride) dry powder or solution in a mixing reactor, adding water for blending to obtain a PAC solution, stirring the PAC solution, adding AS (Aluminum Sulfate) dry powder or solution, adding water for dissolving under stirring, further dropping alkali or alkaline earth metal compound to control basicity to obtain a binary mixed solution containing the PAC and the AS; stirring the binary mixed solution, adding PDMDAAC (poly dimethyl diallyl ammonium chloride) colloid or dry powder, stirring until the PDMDAAC colloid is completely dissolved to obtain a stable PAC-AS-PDMDAAC ternary compound coagulant, wherein the contents of the PAC and the AS are metered in the terms of the mass percent of the Al2O3; and diluting the ternary compound coagulant with water or directly putting the ternary compound coagulant to be used for coagulating raw materials, flocculating wastewater and sewage and dewatering sludge. The ternary compound coagulant is directly put (or diluted) according to the putting amount requirement in a single chemical agent form for strengthening and coagulating various kinds of raw water, flocculating the wastewater and the sewage and dewatering the sludge.
Owner:NANJING UNIV OF SCI & TECH
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