213results about How to "The preparation method is simple and feasible" patented technology

The invention relates to high temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid of a high temperature and high pressure drilling and a preparation method thereof. Four monomers, namely, acrylamide (AM), 2-acrylamide-2-methyl propane sulfonic acid (AMPS), dimethyl diallylammonium chloride (DMDAAC) and styrenesulfonate (SSS) are used as raw materials, wherein the mole ratio of AM:AMPS:DMDAAC:SSS is (9-11):(3-4):(0.5-1.5):(1.0-1.5); ammoniumpersulfate-sodium bisulfite as an initiator is added and solution is copolymerized through a polymerization method to compose the fluid loss agent. The fluid loss agent provided by the invention has the advantages of ideal high temperature resistant (more than 220 DEG C) reducing filtrate performance, shale inhibition performance and stable fluid rheology performance and simple preparation method, convenient operation and higher yield.

The invention relates to a method for preparing a temperature-resistant anti-salt amphoteric polymer filtrate reducer used for drilling fluid. In the filtrate reducer, C6 to C10 paraffin hydrocarbons are used as a continuous phase; Span and Tween are used as a compound non-ionic surface active agent, wherein the mass ratio of the Span to the Tween is 2-4:1-3; three monomers, namely acrylamide(AM), acrylic acid(AA) and styrene sulfonic sodium(SSS), are used as raw materials in a mass ratio of 10:3-6:1-4; and an initiator of ammonium persulphate or redox initiator of ammonium persulphate-sodium bisulphite is added for copolymerization by adopting an opposite micro-emulsion polymerization method to obtain the filtrate reducer. The filtrate reducer provided by the invention has the advantages of higher temperature resistance, salt resistance and filtrate-reducing property, simple preparation method, mild and controllable reaction conditions, high polymerization stability, high reaction speed and high conversion rate.

The invention relates to a temperature and salt-resistant AM / ACD / AE copolymer used as an oil displacement agent in the petroleum exploitation and a preparation method thereof. The temperature and salt-resistant AM / ACD / AE copolymer can meet the requirements of the injected liquid viscosity with the incessant increasing of the oil reservoir temperature and the stratum mineralization. The technical scheme of the invention is characterized in that the mole ratio of the raw materials used in the preparation of the copolymer comprises, by mole percentage, 88.2-91.4% of an AM monomer, 8-11% of an ACD monomer, 0.6-0.8% of an AE monomer, an oxidizing agent potassium persulphate which accounts for 0.3-0.5% of the total weight of the monomers, and a reducing agent sodium bisulfite which accounts for0.35-0.45% of the total weight of the monomers. The preparation method provided by the invention comprises the following steps of: adding AM, ACD and AE into a container, adding water to produce a solution at the concentration of 15%, dissolving with stirring, adding the oxidizing agent and the reducing agent with uniformly blending, deoxygenizing by filling nitrogen, reacting at the temperature of 40-50 DEG C for 4-5 hours, washing and drying to obtain the AM / ACD / AE copolymer. The preparation method provided by the invention is simple and feasible with mild reaction conditions; the product prepared by the method has inclusion and aggregation functions as well as temperature and salt-resistant performance, and can be used in tertiary oil extraction.

The invention discloses acrylamide / 2-acrylamido-2-methylpropane sulfonic acid sodium / cyclodextrin modified acrylamide (AM / AMPS-Na / MAM) copolymer serving as a fluid loss reducer for drilling fluid in oilfield, and a preparation method thereof, which can solve the problems of short cement paste thickening time, failure of an additive and high filter loss due to strata pressure and temperature rise. The technical scheme is that: the copolymer is prepared by polymerizing 83 to 85 percent of acrylamide AM, 15 to 16 percent of 2-acrylamido-2-methylpropane sulfonic acid sodium AMPS-Na and 1 to 2 percent of cyclodextrin modified acrylamide MAM. The preparation method comprises the following steps of: adding aqueous solution of the AM, solution of the MAM and solution of the AMPS-Na into a reaction container; adding ethylene diamine tetraacetic acid, potassium peroxydisulfate and sodium hydrogensulfite; and stirring uniformly, and reacting at the temperature of between 40 and 50DEG C for 5 to 6 hours under the protection of nitrogen to obtain the AM / AMPS-Na / MAM copolymer. The AM / AMPS-Na / MAM copolymer serving as a drilling fluid treating agent has high thermal stability, high temperature resistance, and better fluid loss reducing effect; the preparation method is simple and practicable, and the reaction conditions are mild; and the AM / AMPS-Na / MAM copolymer is used as the drilling fluid treating agent in the oilfield.

The invention provides a collagen / chitosan composite sponge biological dressing, and belongs to the field of medical polymer materials. The biological dressing is compounded by collagen, chitosan and nano-titanium dioxide; the nano-titanium dioxide accounts for 1-5% of the total weight of the collagen and the chitosan; and weight percentage of the collagen is 50-70%, and the weight percentage of the chitosan is 30-50%. The wound dressing has good mechanical property; toxin residues caused by utilization of cross-linking agents and structure collapse caused by secondary freeze-drying are avoided; the problem of bacterial infection in a wound healing process can be solved effectively; and a sterile environment can be provided in a wound healing process.

The invention relates to a flexible fiber paper and a manufacturing method thereof. The flexible fiber paper is made by the way that fiber paper blank with the basis weight of 12.5-15g / m2 is wound on the impression cylinder of a conventional coating device under normal temperature and normal humidity (standard: temperature is 20 DEG C, and humidity is 65%RH), the fiber paper blank is coated with medicine solution containing the following main components: 0-15wt% of oiling agent, 60-90wt% of polyalcohol, 3-20wt% of saccharides and 3-5wt% of non-ionic surfactant, and antibacterial agent can be added into the medicine solution, so that the flexible fiber paper has antibacterial function. By utilizing the transfer printing manner or atomizing manner of the coating device, the medicine solution is coated by the proportion of 15-30wt%, thus obtained the flexible fiber paper. The flexible fiber paper of the invention has high safety on skin, soft handfeel and obvious moistness, and less paper dust is produced, thus being especially applicable to face tissues for sensitive skin, children or women.

The invention discloses a preparation method of a bowl-like nitrogen-doped carbon hollow particle, comprising the following steps of forming a completely collapsed bowl-like vesicle through self assembling of an amphipathic PS-b-PEO segmented copolymer in solution; taking the bowl-like vesicle as a template to support dopamine to polymerize on a PEO chain segment, thereby obtaining a bowl-like polydopamine @Kippah vesicle particle; roasting the bowl-like polydopamine @Kippah vesicle particle with two steps in a nitrogen flow, and obtaining the bowl-like nitrogen-doped carbon hollow particle. The preparation method provided by the invention is simple, convenient and feasible, has high success rate and conversion rate, and can effectively reduce preparation cost. The invention also discloses an application of the bowl-like nitrogen-doped carbon hollow particle. According to the invention, the bowl-like nitrogen-doped carbon hollow particle is applied to super capacitors as an electrode material for the first time, and extremely high capacitance, good capacity retention ratio and outstanding cycling stability are realized.

The invention provides a barium strontium calcium descaling agent, which comprises the following components in terms of weight percentage: 20-35% of a metal chelating agent, 10-20% of a solubilizer, 0.5-5% of a dispersant, and 5-5% of potassium hydroxide 15%, deionized water 40-60%. Compared with the prior art, the barium strontium calcium descaling agent created by the present invention has good descaling performance, can effectively remove barium sulfate, strontium sulfate, calcium sulfate and other inorganic composite scales, has high descaling efficiency, and has no harm to the natural environment , safety in use, and no corrosion to equipment, etc., have important practical significance for improving oil and gas recovery.

The invention discloses a preparation method of an MXene-carbon aerogel / TPU composite material. The method specifically comprises the following steps: firstly, etching an MAX phase precursor by LiF / HCl to prepare a few-layer MXene solution; preparing an MXene-cellulose aerogel by using a few-layer MXene solution; then, putting the MXene-cellulose aerogel into a tubular furnace to be carbonized, and obtaining MXene-carbon aerogel; and finally, preparing a MXene-carbon aerogel / TPU composite material from the MXene-carbon aerogel and TPU particles. According to the composite material prepared by the method, the unique design of a three-dimensional structure enables electromagnetic waves to enter more easily, and incident waves are attenuated through multiple reflections and scattering in the porous structure, so that excellent electromagnetic shielding performance is obtained, and the application requirements in the fields of aerospace, electronic packaging and the like can be met.

The comprehensive indigo powder waste gangue slag recovering treatment process includes heating the mixture of waste gangue slag and water in a reactor to 4-80 deg.c for the waste gangue slag to dissolve fully; centrifugally separating to eliminate dreg and create mother liquid A; cooling mother liquid an in a crystallizing tank for 12-30 hr; press filtering or centrifuging to separate crystal as mixture of crystal carbonate and natron from crystallized liquid A; and calcining the crystal mixture to obtain anhydrous sodium carbonate. The said process can recover sodium hydroxide, potassium hydroxide, potassium carbonate, potassium salt and sodium carbonate in low cost and high yield.