39results about How to "Shear thinning" patented technology

The invention discloses a method for preparing a vinyl chloride-vinyl acetate copolymer paste resin by utilizing emulsion polymerization. The method comprises the following steps: under an anaerobic airtight condition, performing polymerization reaction on a compound emulsifier, a trigger, desalted water, a pH regulator, a first generation seed, a second generation seed, a vinyl chloride monomer and a vinyl acetate monomer, thereby preparing the vinyl chloride-vinyl acetate copolymer emulsion, wherein the polrvinyl chloride emulsion is taken as the first generation seed with an emulsion grain size of 100-200nm and a solid content of 25-50%, and the polrvinyl chloride emulsion is taken as the second generation seed with the emulsion grain size of 700-1000nm and the solid content of 25-50%. According to the method, the emulsion of the first generation seed and the second generation seed are added in a copolymerizing system; the copolymer emulsion is prepared; and after the copolymer emulsion is subjected to spray drying, the vinyl chloride-vinyl acetate copolymer paste resin with lower B type paste viscosity is obtained. The method has the advantages of simple process, large controllable scope of the emulsion grain size, and wide application scope of post processing.

The invention discloses anhydrous fracturing fluid suitable for unconventional reservoir fracturing. The anhydrous fracturing fluid comprises, by mass, 1.0-2.0% of gelling agent, 2.0-4.0% of micelle accelerant, 0.1-0.5% of temperature stabilization agent and the balance alkyl hydrocarbon. The temperature stabilization agent is sulfamic acid or dodecylbenzene sulfonic acid, the alkyl hydrocarbon is one kind or more kinds of propane, butane and pentane, the gelling agent is dialkyl group phosphate ester iron, and the micelle accelerant is an organic complex containing trivalent metal ions. The invention further discloses a preparing method of the anhydrous fracturing fluid. The gelling agent is liquid at the normal temperature and is good in liquidity, the fracturing fluid is simple in preparing technology, the glue forming speed is controllable, the fracturing transformation of shale beds below 130 DEG C can be met, a gel breaker is not needed, the fracturing fluid is gasified under the formation temperature and the pressure and can be recycled after begin discharged out of the ground through a well pipe, external discharge and pollution of waste liquid are avoided, and the anhydrous fracturing fluid has the advantages of being environmentally friendly and the like.

A packaged aerosol foaming skin cleanser can include a multiphase skin cleansing composition, a low pressure foaming agent, and a package.

The invention discloses a modification method of a temperature-sensitive hydrogel material, the modified temperature-sensitive hydrogel material and biological 3D printing ink, and belongs to the technical field of hydrogel. The method for modifying the temperature-sensitive hydrogel material includes partially crystallizing a cross-linked network of the temperature-sensitive hydrogel material. The crystal is a highly ordered and stable object, and a cross-linked network part of the temperature-sensitive hydrogel material is crystallized to stabilize the cross-linked network structure of the hydrogel, so that the hydrogel can be recovered under the action of shear force. The cross-linked network is partially crystallized, so that the cross-linked network of the temperature-sensitive hydrogel material has a crystallization area, and compared with an amorphous cross-linked network, the crystallization area can significantly improve the stability of the cross-linked network and the mechanical strength of the hydrogel, and the hydrogel still maintains the properties of shear thinning and rapid curing.

The invention discloses a 3D printing high strength temperature-sensitive supermolecular hydrogel stent for bone repair. The hydrogel is prepared by the following steps: first, taking acroloyl glycinamide and N-acroloyl (trihydroxymethyl) amino methane as a raw material; in the presence of an initiator, carrying out free radical polymerization to prepare copolymerized gels of different monomer concentrations. The hydrogel has different properties by changing the general monomer concentration or adjusting the mass ratio of two monomers, can be melted and flow at a high temperature, and has thecharacteristics of shear thinning. After the hydrogel is melted, tricalcium phosphate nanoparticles are blended to prepare the porous stent by means of a 3D printing technology. The hydrogel is simplein formula, safe in component and mild in preparation condition. The obtained ink is proper in viscosity and suitable for continuously extruded 3D printing. The bone repair stent constructed based onthe 3D printing slurry is safe and stable.

The invention relates to the technical field of daily chemical product type mosquito repellents applied to the surface of skin of a human body and particularly relates to an ethanol-free anti-mosquitocomposition capable of improving the effects of p-menthyl-3,8-diol. Selected grease is capable of well dissolving p-menthyl-3,8-diol at the normal temperature, has certain dissolving capacity at a low temperature and can be uniformly spread on the surface of the skin, an added water-resistant film forming agent is capable of generating a synergetic spreading effect and prolonging the standing time of p-menthyl-3,8-diol on the surface of the skin, so that the influences caused by external moisture and moisture in sweat to an anti-mosquito film formed on the surface are reduced, and the anti-mosquito effect is improved; and besides, by adding butanediol, the solubilizing of p-menthyl-3,8-diol can be assisted, so that the separation of crystals is prevented. By conditioning the proportion ofgrease to other components in the composition, the product with a stable system and good skin feel experience can be acquired.

The invention discloses a fumaric acid pour point depressant for crude oil and a preparation method of the fumaric acid pour point depressant, and belongs to the technical field of crude oil pour point depression. The pour point depressant is formed by polymerizing a first prepolymer, a second prepolymer, a third monomer and a fourth monomer, the first prepolymer is formed by pre-polymerizing vinyl acetate and a first monomer, and the second prepolymer is formed by pre-polymerizing fumaric acid and a second monomer. The preparation method of the fumaric acid pour point depressant for the crude oil is simple, the prepared pour point depressant is good in acid resistance and salt resistance, the condensation point and the viscosity of the crude oil can be effectively reduced, the hydrophobicity of the pour point depressant can be improved through mutual cooperation of all the monomers, then the affinity between the crude oil and a reservoir and a pipeline is reduced, and the yield and the transportation volume are increased.

The invention belongs to the technical field of medicines, and particularly relates to an injectable drug-loaded xanthan gum/methyl cellulose composite hydrogel precursor solution. The drug-loaded xanthan gum/methyl cellulose composite solution comprises 0.5-10 percent by mass volume of xanthan gum and 3-20 percent by mass volume of methyl cellulose, and is a micromolecular medicine or macromolecular medicine. The composite aqueous solution is in a high-viscosity state at room temperature, and has excellent shear thinning and quick restoring injection performances; when the high-viscosity composite aqueous solution is injected into a body, the composite solution shows quick gelatinization performance at 37 DEG C, namely body temperature, and the formed composite hydrogel has excellent mechanical performance, biocompatibility, biodegradability and drug sustained-release effect. The drug-loaded xanthan gum/methyl cellulose composite hydrogel can be widely applied to the field of drug delivery.

The invention discloses biologic ink with uniformity-distribution cells based on 3D printing. The biologic ink with the uniformity-distribution cell comprises a biologic ink body and biologic active cells suspended in the biologic ink body, wherein the biologic ink body is prepared from the following ingredients: methacrylic anhydride gelatin, fibroin microspheres, fetal calf serum, a photo-crosslinking initiator and a balance buffer solution. The biologic ink adopting the technical scheme has the advantages that the viscosity of the biologic ink is improved by adding the fibroin microspheres;the sinking of cells at each layer surface of the biologic ink is retarded by increasing the buoyancy force received by the biologic active cells in the biologic ink; the cell deposition phenomenon in a biologic 3D printing process is relieved; all ingredients are water-soluble and have good biocompatibility; no cytotoxicity exists; biologic active ingredients are contained; the biodegradation can be realized; good application prospects are realized in complicated and refined biologic printing and composite cell biologic printing.

The invention relates to a method for preparing konjac glucomannan gel through direct current. The method includes the steps of firstly preparing konjac glucomannan hydrosol, adding sodium tungstate dihydrate, inserting an electrode into the hydrosol, introducing the direct current into the hydrosol, and obtaining the konjac glucomannan gel. The synthetic konjac glucomannan gel is high in heat stability and has the shear thinning characteristic. Operation is convenient by adopting the direct current, control is easy, the gel can be quickly obtained, and time and labor are saved. The method is easy to realize, a buffer solution is not needed, a special device with an inner barrier film is also not needed, and the method has application and popularization value. According to the method, other additives do not need to be added, cost is saved, and environment friendliness is achieved.

The invention discloses a high-temperature profile controlling and flooding agent for offshore thickened oil steam flooding, and application thereof. The high-temperature profile controlling and flooding agent comprises, by mass, 0.5-1% of a foaming agent, 1-2% of a nano-particle foam stabilizer, 0.01-0.05% of an interface synergist, and the balance of water. The foaming agent is a compound of an anionic surfactant and an anionic-nonionic surfactant in a mass ratio of (1-3): 1; the anionic surfactant is long-carbon-chain alpha-olefin sodium sulfonate, and the carbon chain length of the anionic surfactant is 20-24; and the anionic-nonionic surfactant is sodium nonylphenol polyoxyethylene ether carboxylate. The high-temperature foam profile controlling and flooding system has good stability at the temperature of 300-350 DEG C, the resistance factor can reach 35 or above, the high-temperature foam profile controlling and flooding system can be used for steam flooding accompanying injection, the problems of steam overlapping and steam channeling can be effectively solved, and the sweep efficiency and displacement efficiency of offshore thickened oil steam flooding can be greatly improved, so the development effect of thickened oil steam flooding thermal recovery is improved.

The invention relates to a preparing method of a stable-rheological-property fabric softener material, and belongs to the technical field of prevention aid materials. According to the technical scheme, saline-alkali soil leachate is adopted as a modification liquid material to be compounded with casein, salt molecules directly or indirectly interact with propylene glycol alginate molecules, sodiumions and potassium ions with positive charges are combined with anion groups on a propylene glycol alginate molecular chain, and therefore the repulsive force between anions on the propylene glycol alginate molecular chain is shielded, the high-molecular chain cannot sufficiently stretch and is in a drawing state, and the solution viscosity is reduced; meanwhile, protein has the properties of polymerized polymer electrolyte, the layering caused by separation and gravity is restrained, the formed protein-polysaccharide compound has remarkable influences on interface properties of an emulsion,the stability of the emulsion is greatly improved, and the stability and viscosity of the softener material are effectively improved.

The invention relates to a pH and photo-thermal dual-response drug-loaded nanoparticle, an injectable collagen hydrogel system as well as a preparation method and application of the injectable collagen hydrogel system. The pH and photo-thermal dual-response drug-loaded nano particle comprises a ZIF-8 metal framework loaded with drug paclitaxel, a thermal response phase change material encapsulated on the surface of the ZIF-8 metal framework, and a polyphenol compound encapsulated on the surface of the thermal response phase change material. According to the drug-loaded nano particle, ZIF-8 is used as a carrier material to load a drug paclitaxel, high drug loading capacity and drug release of pH responsiveness at a spinal cord injury inflammation part are achieved, the thermal response phase change material endows the drug-loaded nano particle with a photo-thermal response function, the polyphenol compound improves the biocompatibility of the drug-loaded nano particle, and the drug-loaded nano particle has a good application prospect. The nano-particles have good light absorption effect in a near-infrared region and also have good photo-thermal responsiveness, and due to the existence of phenolic hydroxyl active groups, a physical or chemical stabilization effect can be generated between polyphenol and collagen, so that the nano-particles are endowed with the capability of combining with the collagen and promoting the cross-linking of the collagen.

The invention provides a wall cloth glutinous adhesive powder. The wall cloth glutinous adhesive powder is prepared from the following raw materials in parts by weight: 90 to 110 parts of waxy corn starch, 2.5 to 5 parts of an ionic alkali, 0.1 to 0.2 part of a cross-linking agent, 1 to 5 parts of an oxidant, 30 to 40 parts of sodium polyacrylate, 5 to 15 parts of polyvinylamine, 0.01 to 0.05 partof a mildew preventive and 60 to 80 parts of water. The wall cloth glutinous adhesive powder has the advantages of high viscosity, proper initial viscosity, good freeze-thaw property, fluidity and waterproofness, and is convenient for glue applying and wall cloth moving and adjusting.

The invention relates to the field of constructional engineering, in particular to a concrete viscosity modifier which structurally comprises the following three parts: a main chain consisting of an organic silicon structural unit A and a polyether unit B; a side chain C which is arranged on the side edge of the main chain and contains nitrogen atoms; and a borosilicate active end D which is connected to the tail ends of the main chain and the side chain. The concrete viscosity regulator overcomes the defects that a concrete viscosity regulator in the prior art cannot adapt to viscosity regulation of middle-low elevation and high-grade concrete at the same time and is narrow in application range, can be suitable for viscosity regulation of middle-low elevation and high-grade concrete at the same time, and is wide in application scene.