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 relates to a fire-proof layer material, a preparation method thereof and fire-proof glass. The fire-proof layer material is prepared from raw materials in parts by weight as follows: 50-300 parts of hydrophilic nano core-shell structure type organic / inorganic hybrid particles, 50-200 parts of deionized water, 5-200 parts of a condensation resistant agent, 0.5-6 parts of a carbon forming agent, 0.5-6 parts of a carbon forming aid, 0.5-6 parts of a heat-resisting stabilizer, 0.05-1 part of an ion fixing agent, 0.3-1.2 parts of a storage stabilizer, 0.1-0.4 parts of a defoaming agent, 0.2-1.2 parts of a cross-linking agent and 30-250 parts of a potassium hydroxide aqueous solution with mass fraction being 50%. The hydrophilic nano core-shell structure type organic / inorganic hybrid particles are widely distributed nanoparticles. The fire-proof layer material has the characteristic of shear thinning and can be used for filling a thinner glass cavity. The composite fire-proof glass prepared from the fire-proof layer material has the advantages of being free of microbubbles, good in adhesion, high in hardness, high in transmittance, long in fire-proof time and resistant to low temperature.

The invention relates to a method for preparing a photosensitive nanocomposite supramolecular hydrogel. In tetrahydrofuran solvent, mercaptopolyethylene glycol monomethyl ether or polyethylene glycol monomethyl lipoate is used as a stabilizer, and chloroauric acid is reduced in situ to form polyethylene glycol monomethyl ether under the action of a reducing agent. Assembling the gold nanocomposite particle of single-layer protection, then the aqueous solution of gold nanoparticles self-assembled single-layer protection of polyethylene glycol monomethyl ether with a mass percentage concentration of 3-20% and a mass percentage concentration of 5-12% α - Cyclodextrin aqueous solution mixed, α -Cyclodextrin is assembled with polyethylene glycol monomethyl ether on the surface of gold nanoparticles to obtain a photosensitive nanocomposite supramolecular hydrogel. The synthesis method of the invention is simple and easy, and the prepared gold nano composite particles have good water dispersibility and stability, and the nano gold is uniformly distributed in the composite supramolecular hydrogel. The nanocomposite supramolecular hydrogel prepared by the invention not only has the performance of shear thinning, but also has photosensitivity, and is expected to be used in the field of biomedical engineering materials as a new injection implant functional material.

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.

The invention relates to a method for preparing konjac glucomannan gel by direct current. The steps are as follows: firstly configuring konjac glucomannan hydrosol, adding sodium tungstate dihydrate, then inserting electrodes into the sol, and applying direct current to obtain konjac glucomannan Glycan Gel. The konjac glucomannan gel synthesized by the present invention has high thermal stability and has shear thinning characteristics; it is easy to operate and control by direct current, and can quickly obtain the gel, saving time and effort; the method is easy to implement and does not require The use of a buffer solution does not require a special device with a built-in barrier film, which has the value of popularization and application; the invention does not need to add other additives, saves costs, and is environmentally friendly.

The invention provides a method for preparing a high-porosity bone tissue scaffold composite by 3D printing, and belongs to the field of additive manufacturing (3D printing). The method provided by the invention is based on a 3D gel technology and a pore former method. The method comprises the steps that firstly, a low-cost pore former and ceramic powder are uniformly mixed to prepare low-viscosity and high-solid-content slurry suitable for printing in combination with a gel system, and a blank body with macroscopically-visible pores is prepared with 3D gel printing; then the blank body is dried, degreased and sintered; and the pore former is decomposed and oxidized to be discharged into air to form microscopic pores, so that the high-porosity bone scaffold composite is obtained finally. The method provided by the invention can precisely control the size, shape and distribution of the macroscopic pores, realizes the preparation of the high-porosity bone tissue scaffold composite with low cost, and has a simple process and low cost.

The application discloses a fumaric acid pour point depressant for crude oil and a preparation method thereof, belonging to the technical field of crude oil point depressant. The pour point depressant is polymerized from the first prepolymer, the second prepolymer, the third monomer and the fourth monomer, wherein the first prepolymer is prepolymerized from vinyl acetate and the first monomer , the second prepolymer is formed by prepolymerizing fumaric acid and the second monomer. The preparation method of the fumaric acid pour point depressant for crude oil of the present invention is simple, and the prepared pour point depressant has good acid resistance and salt resistance, can effectively reduce the freezing point and viscosity of crude oil, and the mutual coordination between the monomers Increase the hydrophobicity of the pour point depressant, thereby reducing the affinity between crude oil and reservoirs and pipelines, and increasing production and transportation.

The invention discloses a 3D-printable high-strength temperature-sensitive supramolecular hydrogel and a preparation method thereof. Copolymerized gels with different monomer concentrations are prepared by free radical polymerization. The hydrogel of the present invention can have different properties by changing the total monomer concentration or adjusting the mass ratio of the two monomers, and can melt and flow at high temperatures. , and has the characteristics of shear thinning, realizing a simple and feasible method for preparing 3D printable high-strength supramolecular hydrogels.

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.