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152results about How to "Improve surface activity" patented technology

Oil displacement method implemented by aid of viscous-elastic surfactants

The invention relates to an oil displacement method implemented by the aid of aqueous solution of viscous-elastic surfactants. The oil displacement method mainly solves problems of difficulty in performing injection accumulation on low-permeability oil reservoirs and low oil displacement efficiency in the prior art. The technical scheme includes that that oil displacement method implemented by the aid of the viscous-elastic surfactants includes enabling rock cores containing crude oil to be in contact with oil displacement agents under the conditions that the oil displacement temperatures range from 40 DEG C to 100 DEG C and the total dissolved solid (TDS) in each liter of formation water is higher than 500 milligrams, and displacing the crude oil in the rock cores; the oil displacement agents contain the viscous-elastic surfactants and the formation water, and the concentration of the viscous-elastic surfactants in the oil displacement agents range from 0.01wt% to 1.5wt%; the viscous-elastic surfactants comprise zwitterionic surfactants and anionic-nonionic surfactants, and a mass ratio of the zwitterionic surfactants to the anionic-nonionic surfactants is 1:(100-1). The oil displacement method has the advantages that the problems can be effectively solved, and the oil displacement method is applicable to tertiary oil extraction production of low-permeability oil reservoirs.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for preparing submicron lamellar magnesium hydroxide by intensifying alkali

ActiveCN102101684AReduce the activation energy of the hydrolysis reactionImprove surface activityMagnesium hydroxideSide productL&D process
The invention relates to a method for preparing submicron lamellar magnesium hydroxide by intensifying alkali, comprising the following steps of: mixing magnesium oxide, the alkali, a dispersing agent and water into slurry according to a certain proportion; carrying out mechanical and chemical treatment to prepare the slurry used for crystallization; carrying out hydrothermal crystallization; carrying out solid-liquid separation on a product, and washing and drying a solid to obtain submicron lamellar magnesium hydroxide powder. In the invention, filter liquor can be recycled; the hydrolysis of the magnesium oxide and the nucleation of the magnesium hydroxide are promoted by utilizing mechanical and chemical action and alkali intensifying action, the shape and the growth of a magnesium hydroxide crystal is regulated and controlled through the hydrothermal crystallization, and no alkali is consumed in the process; as the magnesium oxide is used as a raw material and an alkalizing mechanical and chemical treatment-hydrothermal crystallization process is adopted, the preparation process flow of the submicron high-dispersion lamellar magnesium hydroxide is shortened, the consumption of the alkali used for a process for preparing the magnesium hydroxide by precipitating soluble magnesium salt and the cost input are decreased, and the hydrothermal crystallization process does not generate any side product like chemical salt and is a clean production process; and in addition, the obtained submicron lamellar magnesium hydroxide is widely used in the fields of flame-retardant and catalytic carriers and other functional materials.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Preparation method of nanometer cordierite-based ceramic dielectric material used for high-frequency chip inductor

The invention relates to a preparation method of a nanometer cordierite-based ceramic dielectric material used for a high-frequency chip inductor, which comprises the following steps of: (1) preparing magnesia-alumina-silica sol; (2) preparing opposite-phase W/O (water-in-oil) microemulsion; (3) performing gelation technology; and (4) pressing amorphous cordierite powder obtained in the above steps by adopting a semi-dry method under the pressure of 100-120 MPa to form small wafers, sintering the small wafers at 850-1050 DEG C in a silicon-molybdenum rod resistor furnace, and maintaining the temperature for 3-6 hours to obtain the nanometer cordierite-based ceramic dielectric material used for the high-frequency chip inductor. The invention has the advantages of regular and uniform nanometer powder shape, high powder surface activity and low degree of aggregation, and is applicable to tape casting. The material can be cofired together with an Ag/Pd electrode at the temperature lower than 950 DEG C to be prepared into ceramics, and the dielectric requirements (epsilon<5, and tg delta<0.001; 1 GHz) and the thermal expansion requirements (3*10<-6>K<-1><=alpha<=6*10<-6>K<-1>, 25-300 DEG C) of the dielectric material used for the high-frequency chip inductor can be met.
Owner:SHENYANG UNIV

Preparation method for on-thread and continuously growing carbon nanotubes on surface of carbon fiber

ActiveCN109797540AImprove surface activityImproved through-thickness performanceCarbon fibresCarbon fiber reinforced polymersTube furnace
The invention relates to a preparation method for on-thread and continuously growing carbon nanotubes on the surface of carbon fiber. The method specifically comprises the steps of performing surfaceelectrochemical anodic oxidation treatment on the carbon fiber, then immersing the treated carbon fiber in Co(NO3)2 solution, inletting hydrogen into a tube furnace to reduce metal salts on the surface of the carbon fiber into elementary metals, then placing the reduced carbon fiber into a chemical vapor deposition furnace, and under protection of hydrogen, performing acetylene pyrolysis at 500-800 DEG C and producing the carbon nanotubes on the surface of the carbon surface with the catalysis of the elementary metals to obtain a carbon fiber-reinforced polymer composite material with the surface loaded with the carbon nanotubes. The carbon nanotubes are multi-walled and the tube walls are basically parallel to the axes of the nanotubes, the multi-walled carbon nanotubes are composed of layered graphite structures, the spacing between the tube walls is small, and the carbon nanotubes of the carbon fiber are uniform in distribution and intertwined with one another to increase the layering resistance and the penetration thickness.
Owner:SHANDONG UNIV

Sulfated cellulose ether-acrylamide graft copolymer, preparation method and application thereof

The invention relates to an oil displacement agent sulfated cellulose ether-acrylamide graft copolymer in tertiary oil recovery, a preparation method and an application thereof. In the preparation method, long-chain alkyl is introduced to a cellulose chain segment of sodium cellulose sulfate; the cellulose chain segment of sodium cellulose sulfate is subjected to hydrophobic modification to obtain sulfated cellulose ether; the sulfated cellulose ether is subjected to graft polymerization with acrylamide to obtain the sulfated cellulose ether-acrylamide graft copolymer with a structural formula in the specification. The prepared macromolecular surfactant sulfated cellulose ether-acrylamide graft copolymer has high surface activity and high viscosity increasing property, is used as an oil displacement agent in tertiary oil recovery, and has the effects of the polymer in enlarging waves and coefficients and the effect of the surfactant in reducing oil-water interfacial tension, so that the problem of chromatographic fractionation effect of current polymer-surfactant combination flooding can be solved, and the oil displacement efficiency is improved. The product can be either independently used as an oil displacement agent, or compounded with alkali or a polymer.
Owner:CHINA PETROLEUM & CHEM CORP +1

Polytetrafluoroethylene composite, polytetrafluoroethylene composite holder for bearing and preparation method of polytetrafluoroethylene composite holder for bearing

The invention discloses a polytetrafluoroethylene composite, a polytetrafluoroethylene composite holder for a bearing and a preparation method of the polytetrafluoroethylene composite holder for the bearing. The polytetrafluoroethylene composite is prepared from, by mass, 3%-8% of coupling agent modified nano aluminum oxide, 2%-5% of molybdenum disulfide and 90%-95% of polytetrafluoroethylene. The polytetrafluoroethylene composite is prepared by compounding polytetrafluoroethylene, coupling agent modified nano aluminum oxide and molybdenum disulfide. Nano aluminum oxide is large in heat conductivity and small in grain size, the crushing resistance, heat conductivity and wear resistance of the composite can be remarkably improved, the material surface activity can be improved after nano aluminum oxide is modified with a coupling agent, and surface binding force is increased. The friction and wear resistance of the composite can be enhanced through molybdenum disulfide; the composite has excellent self-lubricating performance and high tensile strength, crushing resistance, heat conductivity and friction and wear resistance are obviously improved, and the requirement of the ultralow-temperature high-speed bearing on the holder is met.
Owner:LUOYANG BEARING RES INST CO LTD

Composite flame retardant sizing agent for regenerated cellulose fiber

The invention discloses a composite flame retardant sizing agent for regenerated cellulose fiber, and the regenerated cellulose fiber produced by applying the composite flame retardant sizing agent. The composite flame retardant sizing agent is prepared by the following steps: mixing cellulose ether, chlorocyclotriphosphazene derivatives and alkyl polyglucoside according to the mass ratio of 1:(1-20):(0.1-5) and then dissolving in industrial soft water, wherein the cellulose ether is taken as an enhancer, chlorocyclotriphosphazene derivatives are taken as a flame retardant and alkyl polyglucoside is taken as an emulsifier. The regenerated cellulose fiber is prepared by the following steps: adding the 0.5-30wt% of the prepared composite flame retardant sizing agent into regenerated cellulose fiber spinning mother liquor, evenly stirring, defoaming for 30-180min and preparing by adopting a wet-process spinning method of the conventional regenerated cellulose fiber, and the regenerated cellulose fiber has excellent flame-retardant property and higher strength and wearability, the wet fracture strength is improved by more than 20% compared with the conventional flame-retardant viscose fiber, and the initial modulus is reduced by more than 35%.
Owner:SHANXI RUISAIGE TEXTILE TECH CO LTD +1
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