39results about How to "Good shear thinning" patented technology

The invention relates to a cellulose type compound system drilling fluid filtrate loss reducer and a preparation method thereof and aims to provide a cellulose type drilling fluid filtrate loss reducer low in cost, excellent in filtrate loss reduction performance and rheological property, environmental friendly and suitable for saltwater-based mud. The cellulose type compound system drilling fluid filtrate loss reducer is prepared from, by weight, 0.6-0.9% of PAC (polyanionic cellulose), 0.06-0.18% of nanocelluloe whiskers and the balance saltwater-based mud, wherein in the saltwater-based mud, the mass fraction of sodium chloride is 14-16%, the mass fraction of bentonite is 2.5-3.5%, and pH of drilling fluid is 9.5-10.5. The cellulose type compound system drilling fluid filtrate loss reducer has excellent synergistic filtrate loss reduction effects; high-temperature high-pressure filtrate loss and API filtrate loss after ageing of a drilling fluid system are remarkably reduced, a shear thinning property is more evident, PAC consumption is reduced by 50% maximally, and accordingly cost is greatly reduced.

The invention discloses a supramolecular structural hydrogel gene vector material and a preparation method and application thereof. The method comprises the following operation steps: synthesizing a multi-block copolymer with cation chain segments through modification of a terminal group of triblock copolymer of a polyethylene glycol-polypropylene glycol-polyethylene glycol which is modified by polylysine; then, mixing the copolymer with DNA solution to obtain DNA compound micelle; further, mixing and then stirring the micelle solution and solution of alpha-cyclodextrin; and keeping mixed solution at the room temperature to obtain hydrogel. The hydrogel can be used for preparing an injectable gene vector. The method has the advantages that the method has simple operation, can adjust the strength of the hydrogel and the gelatination time, can mold at the room temperature and does not relate to chemical crosslinking reaction and the use of organic solvent; and the obtained hydrogel has the advantages of temperature sensitivity, good bio-compatibility, obvious transfection effect and the like; and the method is hopeful to be widely applied in the field of a biomedical engineering material.

The present invention discloses a seawater-based fracturing fluid and a preparation method thereof. 100 parts of the fracturing fluid comprises, by weight, 0.3-0.8 part of a thickener, 0.1-0.6 part of a cross-linking agent, 0.05-0.1 part of an oxygen scavenger, 0.02-0.05 part of a tackifying auxiliary agent, 0.05-0.2 part of gel breaker, and the balance or part of seawater, wherein the thickener modified polyacrylamide is formed by carrying out copolymerization on acrylamide, a hydrophobically modified monomer and a sulfonate, the hydrophobically modified monomer is dodecyl alkyl halide, and the cross-linking agent is an organic zirconium cross-linking agent or an organic titanium-zirconium composite cross-linking agent. According to the present invention, with the seawater-based fracturing fluid and the preparation method thereof, the technical problems of being incapable of continuously mixing, insufficient tackifying performance, poor salt resistance and poor shearing resistance of the seawater-based fracturing fluid in the prior art are solved; and the seawater-based fracturing fluid with characteristics of good tackifying, strong salt resistance, strong shearing resistance and continuous mixing and suitable for offshore oil fields is provided.

The invention discloses supermolecular hydrogel and preparation method and application thereof. The preparation method of the supermolecular hydrogel comprises the following steps of: synthesizing a polyethylene glycol modified cation copolymer; mixing with a nucleic acid solution and standing to obtain a copolymer / nucleic acid composite solution; and finally, mixing with alpha-cyclodextrin solution, and standing to obtain the supermolecular hydrogel capable of acting on a gene vector material. In the forming process of the hydrogel disclosed by the invention, a chemical crosslinking reactiondoes not happen, and thus the influence of a byproduct of the chemical crosslinking reaction on the activity of nucleic acid is effectively avoided, an efficient gene transfer effect is realized, andthe transfection efficiency is obviously improved over the conventional gel material; and moreover, the preparation method is convenient and quick, realizes formation at room temperature, imposes relatively low requirements on concentration and temperature, and is favorable for maintaining the biological activity of embedded gene and the biocompatibility of the material.

The invention discloses a super-molecular hydrogel double-medicament carrier for simultaneously loading hydrophilic and hydrophobic medicaments and a preparation method as well as application thereof. The method comprises the following operating steps of: performing chemical modification on the hydrophobic medicament by using methoxypolyethylene glycol to synthesize a water-soluble macromolecularprodrug; physically mixing prodrug molecules with the hydrophilic medicament; further mixing the mixed solution with an alpha-cyclodextrin solution and stirring; and standing at room temperature to obtain the super-molecular hydrogel double-medicament carrier for simultaneously loading the hydrophilic and the hydrophobic medicaments. The carrier has the advantages of easiness in operation, adjustable gel strength and gelation time, forming at room temperature, no chemical crosslinking reaction or organic solvent, high bioavailability, sustainable and controllable release of the medicament andthe like, and is expected to be widely applied to the field of biomedical engineering materials.

The invention discloses composite paste for disperse printing and a preparation method thereof, and belongs to the technical field of textile printing and dyeing. The composite paste is characterizedin that starch and tamarind gum are uniquely adopted to be taken as a dispersing base material with a product subjected to carboxymethylation and modification, and the dispersing base material is compounded with sodium carboxymethyl cellulose, sodium hexametaphosphate and sodium dihydrogen phosphate; and the obtained composite paste has relatively good rheological property, water-holding propertyand paste-removing property. The composite paste can be used after being directly dissolved with cold water, is relatively good in stability, and is convenient for being stored for a long time.

The invention provides a bis-phenyl hydrophobic monomer and a preparation method of the monomer, wherein the structural formula of the monomer is as shown in the formula I. The invention also provides plugging gel, which is prepared from reaction raw materials comprising alkenyl amide, alkenyl carboxylate, alkenyl sulfonate, a crosslinking agent, the monomer and an initiator by a free-radical micelle polymerization method. The plugging gel has high shear dilutability before gelatinization, has excellent dilution resistance after gelatinization, has the advantages of simple production process and low cost, and is favorable for industrialized production and on-site popularization and application.

The present invention provides a temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and a preparation method thereof. The gel leak-stopping agent of the present invention has the following advantages that: the gel leak-stopping agent has extra-wide temperature adaptability, can adapt to a temperature range of 25-180 DEG C, and can meet requirements of oil field construction; the gel leak-stopping agent has rapid dissolution rate, and forms the structure type gel with good shear thinning behavior after dissolving, wherein the structure type gel is the liquid which can be pumped and flow; the gel leak-stopping agent does not require cross-linking; the real fluid leak-stopping is realized; the construction is convenient; the product is completely dissolved in water, no precipitate and flocculent insoluble matter are generated during the whole process, no insoluble matter is generated after the product is degraded, such that the flow back is easy or the flow back is not required, the reservoir is not damaged; the product is safe and environmental protection, and is synthesized by the multi-stage initiation, such that the product conversion rate is high, the stability is good, no toxic damage is generated to the stratum, the production layer can be protected.

The invention discloses a supramolecular structural hydrogel gene vector material and a preparation method and application thereof. The method comprises the following operation steps: synthesizing a multi-block copolymer with cation chain segments through modification of a terminal group of triblock copolymer of a polyethylene glycol-polypropylene glycol-polyethylene glycol which is modified by polylysine; then, mixing the copolymer with DNA solution to obtain DNA compound micelle; further, mixing and then stirring the micelle solution and solution of alpha-cyclodextrin; and keeping mixed solution at the room temperature to obtain hydrogel. The hydrogel can be used for preparing an injectable gene vector. The method has the advantages that the method has simple operation, can adjust the strength of the hydrogel and the gelatination time, can mold at the room temperature and does not relate to chemical crosslinking reaction and the use of organic solvent; and the obtained hydrogel has the advantages of temperature sensitivity, good bio-compatibility, obvious transfection effect and the like; and the method is hopeful to be widely applied in the field of a biomedical engineering material.

The invention relates to a method for preparing high-strength supramolecular hydrogel. The method comprises the following steps: (1) synthesizing polyethylene glycol-polycaprolactone-polycationic copolymer; (2) preparing a copolymer / nucleic acid composite liquid; and (3) mixing the copolymer / nucleic acid composite liquid obtained in the step (2) and an alpha-cyclodextrin liquid to prepare the high-strength supramolecular hydrogel. The invention also relates to the high-strength supramolecular hydrogel prepared by the method and an application of the hydrogel. The hydrogel forming process does not have chemical crosslinking reactions, the influence of chemical crosslinking reaction by-products on the activity of nucleic acid can be effectively avoided, the hydrogel has an effective gene transfer effect, the preparation method is convenient and quick, the hydrogel can be formed at room temperature, and the bioactivity of an embedded gene and the biocompatibility of a material can be kept. According to the hydrogel, the defect of quick degradation of current similar gel materials can be overcome, the nucleic acid can be released for more than 2 weeks, and the aim of long-time durable transfection can be achieved.

The invention provides a 3D printing platform spray preparation. The 3D printing platform spray preparation is prepared from the following raw materials in percentage by weight: an anionic film forming polymer, hydrophobically modified acrylate or salt thereof, a block polymer composed of at least one polyethylene glycol block and at least one polypropylene glycol block, an organic solvent, liquefied low-boiling-point organic compound gas and polysiloxane. All the components in the preparation have synergistic actions and jointly enable the sprayed spray preparation to have proper viscosity, adhesion strength, shearing dilutability and solidification speed, so that the spray preparation can be uniformly covered on the surface of the 3D printing platform; after the spray preparation is solidified, the spray preparation has proper strength; the molding precision is ensured; and the occurrence of warpage is effectively avoided.

The invention provides a hydrophobic monomer and a preparation method thereof, wherein the structural formula of the monomer is as shown in the formula I. The invention also provides hydrogen for drilling leaking stoppage, which is prepared from reaction raw materials comprising alkenyl amide, alkenyl carboxylate, alkenyl sulfonate, a surfactant, the monomer and an initiator by a free-radical micelle polymerization method. The hydrogel has high apparent viscosity and high shear dilutability under a low shear rate before gelatinization, has excellent dilution resistance after gelatinization, has the advantages of simple production process and low cost, and is favorable for industrialized production and on-site popularization and application.

The invention relates to a cellulose type compound system drilling fluid filtrate loss reducer and a preparation method thereof and aims to provide a cellulose type drilling fluid filtrate loss reducer low in cost, excellent in filtrate loss reduction performance and rheological property, environmental friendly and suitable for saltwater-based mud. The cellulose type compound system drilling fluid filtrate loss reducer is prepared from, by weight, 0.6-0.9% of PAC (polyanionic cellulose), 0.06-0.18% of nanocelluloe whiskers and the balance saltwater-based mud, wherein in the saltwater-based mud, the mass fraction of sodium chloride is 14-16%, the mass fraction of bentonite is 2.5-3.5%, and pH of drilling fluid is 9.5-10.5. The cellulose type compound system drilling fluid filtrate loss reducer has excellent synergistic filtrate loss reduction effects; high-temperature high-pressure filtrate loss and API filtrate loss after ageing of a drilling fluid system are remarkably reduced, a shear thinning property is more evident, PAC consumption is reduced by 50% maximally, and accordingly cost is greatly reduced.

The invention relates to a compounding method to form water solubility intermolecular association ternary hydrophobic association polymer that includes acrylamide, sodium acrylate, and allyl-alkylphenyl aether three constructions. The method includes the following steps: using acetone as reacting solvent, alkylphenols and allyl chloride as raw material, benzyl triethyl ammonium chloride as phase-transfer catalyst, reacting for 4-8 hours at 40-60 degree centigrade to form drainage monomer allyl-alkylphenyl aether; adding sodium acrylate, acrylamide and allyl-alkylphenyl aether monomer into reactor according to the mol ratio as 20-30:69.2-79.2:0.8, adding inducing agent, sealing reacting for 2-6 hours to gain terpolymer. The terpolymer has good temperature resistance, saline tolerance, dissolubility and high temperature stability. The invention is easy to compound and has mild condition.