125results about How to "Reduce system viscosity" patented technology

The invention provides an extraction system for extracting lithium isotope. The system comprises an extracting agent, a hydrophobic ionic liquid and a diluent. The hydrophobic ionic liquid and the diluent are in the volume ratio of 1-15:1-10; the extracting agent has concentration in an extraction organic phase of 0.05-2.5mol / L; the extracting agent is at least one of benzo-15-crown-5 and a derivative thereof, or benzo-14-crown-4 and a derivative thereof. Compared with the crown ethers and pure ionic liquid system of the prior art, the system has the advantages of low operating costs and strong industry adaptability.

The invention discloses a preparation method of an oxidized bacterial cellulose solution, and belongs to the field of dissolution of bacterial cellulose. The preparation method comprises the followingsteps: purifying, crushing, homogenizing and performing ultrasonic treatment to bacterial cellulose, then oxidizing by a mixed oxidizing system of TEMPO/NaBr/NaClO, then washing, performing dry crushing or dewatering to obtain oxidized bacterial cellulose powder or an oxidized bacterial cellulose slurry, dissolving the oxidized bacterial cellulose powder or the oxidized bacterial cellulose slurryby using an aqueous alkaline dissolving agent solution, then standing at a low temperature for freezing, and thawing to obtain the transparent oxidized bacterial cellulose solution. The preparation method is simple and easy to implement, a technology is easy to control, the reagent dosage is relatively low, and the cost is saved; by the preparation method, the cellulose can be effectively dissolved to directly obtain the oxidized bacterial cellulose solution; the oxidized bacterial cellulose solution can be widely applied to the field of packaging, biomedical materials, intelligent hydrogels,membrane preparation, preparation of specially-shaped hydrogels and the like, so that the application field of the bacterial cellulose is widened.

The invention relates to a stereo-lithography rapid-prototyping polysiloxane photosensitive resin composition and its preparation method and application. The stereo-lithography rapid-prototyping polysiloxane photosensitive resin composition mainly comprises the following raw materials (by weight): 10-85% of double-side acrylate polysiloxane, 3-21% of polyacrylate polysiloxane, 10-60% of an acrylate polysiloxane diluent, 10-60% of an acrylate diluents and 1.0-4.0% of a radical initiator. The raw materials are mixed according to the above ratio and the mixed raw materials are stirred and heated to obtain a transparent liquid, namely the stereo-lithography rapid-prototyping polysiloxane photosensitive resin. After stereo-lithography prototyping, the stereo-lithography rapid-prototyping polysiloxane photosensitive resin composition has rapid-prototyping characteristic of photosensitive resin and also has polysiloxane characteristic of high and low temperature resistance. A component molded by the use of the photosensitive resin has advantages of high precision, good heat resistance and the like.

The invention discloses a method for in-situ preparing a nano-silicon dioxide/hydroxy terminated polydimethylsiloxane hybrid material. The method comprises the following steps: heating cyclosiloxane and a catalyst to 95-105 DEG C under a stirring state, stirring for 30-120 minutes to open loop of cyclosiloxane and perform prepolymerization reaction; then, adding nano-silicon dioxide, and stirring at the constant temperature of 95-105 DEG C until no fraction is distilled out; and stirring under a condition that the vacuum degree is negative 0.02MPa-negative 0.09MPa until no fraction is distilled out, wherein the mass ratio of cyclosiloxane monomer to the catalyst to nano-silicon dioxide is 100:5*10<4>-2*10<4>:(2-18). According to the hybrid material prepared by the method, the rheological property of the hybrid material is improved, nano-silicon dioxide and PDMS are bonded through chemical bonds, and the bonding mode of inorganic filler and polymer matrix is changed.

The invention relates to a stereo-lithography rapid-prototyping cationic polysiloxane photosensitive resin composition and its preparation method and application. The stereo-lithography rapid-prototyping cationic polysiloxane photosensitive resin composition mainly comprises the following raw materials (by weight): 10-85% of double-side polysiloxane containing an epoxide group, 3-21% of polyepoxy polysiloxane, 10-60% of a polysiloxane diluents containing an epoxy group and 1.0-4.0% of a cationic initiator. The raw materials are mixed according to the above ratio and the mixed raw materials are stirred and heated to obtain a transparent liquid, namely the stereo-lithography rapid-prototyping polysiloxane photosensitive resin. After stereo-lithography prototyping, the stereo-lithography rapid-prototyping polysiloxane photosensitive resin has rapid-prototyping characteristic of photosensitive resin and also has polysiloxane characteristic of high and low temperature resistance. A component molded by the use of the photosensitive resin has advantages of low shrinkage, high product precision, good heat resistance and the like.

The invention discloses an adhesive with high electrical and thermal conductivity and a preparation method thereof. The conductive adhesive comprises the following components in parts by weight: 5-10 parts of epoxy resin, 0.5-2 parts of a toughening agent, 3-5 parts of a curing agent, 0.03-0.06 part of a curing accelerator, 0.05-0.2 part of a coupling agent, 0.1-0.5 part of a thixotropic agent, 3-8 parts of a solvent and 82-96 parts of a conductive filler, the conductive filler is silver powder, the tap density is 3-6g/cc, and the average particle size is 2-5 microns. According to the technical scheme, the formula is based on epoxy resin, silver powder with different particle sizes is used as conductive filler to prepare the high-thermal-conductivity and high-electric-conductivity adhesive, and meanwhile, the high-thermal-conductivity and high-electric-conductivity adhesive has good electric conductivity and mechanical property; the heat conductivity is greater than 10W/m.k, and the heat conductivity coefficient is more than four times that of the conventional conductive adhesive; the volume resistivity is lower than 9 * 10 <-5 > omega.cm; and the shearing force is greater than 10Kgf.

The invention relates to a three-dimensional photoetching rapidly-formed hybrid polysiloxane-based photosensitive resin composition and a preparation method and application thereof. The three-dimensional photoetching rapidly-formed hybrid polysiloxane-based photosensitive resin composition mainly comprises the following raw materials based on mass ratio: 20-70% of polysiloxane epoxy resin, 10-45% of polysiloxane acrylic ester, 1.0-4.0% of radical initiator, 1.0-6.0% of cationic initiator and 10-60% of polysiloxane diluents. The three-dimensional photoetching rapidly-formed hybrid polysiloxane-based photosensitive resin composition is obtained by mixing the raw materials and heating the mixture into a transparent liquid under stirring according to the above proportions. The three-dimensional photoetching rapidly-formed hybrid polysiloxane-based photosensitive resin composition disclosed by the invention can develop the characteristic of rapid forming of photosensitive resin and also has the characteristic of high- and low-temperature resistance of polysiloxane after three-dimensional photoetching forming. The part formed by using the photosensitive resin has the advantages of high accuracy, favorable heat resistance and the like.

The invention discloses a kettle-type method for preparing needle coke, which comprises the following steps: (1) adding raw oil into a coking kettle, heating to 430-480 DEG C, keeping the constant temperature for 2-6 hours while controlling the pressure of 0.5-2.0 MPa, collecting the discharged oil gas, and separating out 200-400 DEG C fraction; (2) after finishing keeping the constant temperature, closing the exhaust port, cooling the system to 200-400 DEG C, adding the 200-400 DEG C fraction collected in the step (1), and keeping the constant temperature for 1-4 hours; (3) after finishing keeping the constant temperature, and slowly heating the system to 430-500 DEG C, wherein the heating speed is controlled to control the exhaust amount at 0.01-1h<-1> and the system pressure at 0.5-2.0 MPa; and (4) heating the system to 520-550 DEG C, and coking for 1-4 hours, wherein the needle coke generated by reaction is deposited on the coking tower bottom. The method can be used for producing high-quality needle coke; and the operational process is easy to control, is simple and feasible, and is suitable for industrial application.

The invention discloses composite paint with good storage stability and a preparation method of the composite paint. The composite paint is prepared from the following components in parts by weight: 25 to 32 parts of water, 0.3 to 0.5 part of hydroxyethyl cellulose, 0.5 to 0.8 part of defoaming agent, 10 to 15 parts of titanium dioxide, 5 to 8 parts of talcum powder, 22 to 30 parts of heavy calcium powder, 0.5 to 0.8 part of stabilizer LOPON ST, 15 to 20 parts of potassium silicate solution, 5 to 8 parts of emulsion and 0.5 to 1 part of reinforcing agent. The test verifies that the storage stable period of the composite paint is about 6 months, so that the storage stability is greatly improved compared with that of the paint in the prior art.

The invention relates to a preparation method of a polyurethane modified acrylate polymeric dispersant for coatings. The preparation method comprises the following steps: preparing polyhydroxy acrylate, synthesizing polymeric polyurethane of mono-isocyanate, and modifying acrylate by virtue of polyurethane. The preparation method has the advantages that the preparation process is simple, products are easily available, and the generation of by-products is avoided; prepared polyurethane modified acrylate has various different polar segments and wide consistency, is applicable to various polar systems, does not influence the consistency of the systems, includes multiple pigment wetting groups and is capable of well dispersing various pigments, so that the tinting strength of the pigments is effectively improved, the viscosity of the systems is effectively decreased, and the pigment slurry has good storage stability and excellent surface dyeing resistance and floating performance.

The invention discloses a solid-phase-free high density well killing fluid, which comprises the following components in percentage by weight: 0.1 to 0.5% of deoxidant, 0.5 to 3.0% of corrosion inhibitor, 40 to 70% of composite salt weighting agent, 5 to 15% of crystallization inhibitor, 0.1 to 1.5% of water locking resistant agent, and the balance being water, wherein the water locking resistant agent is prepared by compounding perfluoro octyl carboxylic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, and methanol/ethanol. The provided solid-phase-free high density well killing fluid has the advantages of no solid phase, low system viscosity, strong anticorrosion performance, little biological toxicity, good reservoir compatibility, and simple and convenient onsite preparation, and solves the problems that conventional well killing fluids have bad reservoir compatibility and thermal stability; crystallization and agglomeration happen when the density of well killing fluid is adjusted for a second time, and solid phase in the well killing fluid damages the reservoir that is next to the well for a second time. The comprehensive performance of well killing fluid is improved.

The present invention discloses high-strength and high-toughness epoxy resin. The high-strength and high-toughness epoxy resin is obtained by curing of the following raw materials: 38wt%-59wt% of substrate resin, 38wt%-59wt% of a curing agent and 0.1wt%-3wt% of an accelerator; the substrate resin is a mixture of epoxy resin and a reactive diluent; the reactive diluent is a weakly-polar epoxy compound with side chains. The epoxy resin cured material with high tensile strength, high tensile modulus and good toughness is obtained by adding a proper amount of weakly-polar and low-viscosity epoxy resin to obtain a low-viscosity epoxy resin component, mixing the obtained epoxy resin component, the curing agent and the accelerator, and performing a curing reaction. According to the invention, various epoxy resin is suitable for preparing the epoxy resin cured material provided by the invention, and the method is simple.

The invention discloses a method for removing metal impurities in residual oil through hydrogenation. According to the method, fed materials comprise a residual oil raw material, hydrogen and a material viscosity adjusting auxiliary agent, the material viscosity adjusting auxiliary agent comprises ethylene tar, and the fed materials are subjected to a hydrotreatment reaction in a hydrodemetallization reaction zone to obtain a hydrogenation effluent; the hydrodemetallization reaction zone is at least filled with a first hydrodemetallization catalyst, wherein the first hydrodemetallization catalyst comprises a carrier component and a hydrogenation active metal component, and the carrier component comprises carbon and alumina. According to the method disclosed by the invention, the ethylene tar is added into the residual oil raw material as a material viscosity adjusting aid, so that the system viscosity under the reaction condition can be effectively reduced, the hydrodemetallization ofthe residual oil is promoted, and the improvement of the reaction performances such as subsequent desulfurization, carbon residue removal and the like is facilitated through the synergistic effect ofall the components under the hydrodemetallization reaction condition.

The invention belongs to the technical field of application of polyurethane and particularly relates to a solvent-resistant polyurethane elastomer and a preparation method therefor. The solvent-resistant polyurethane elastomer is prepared from a component A, a component B and a component C according to the mass ratio of 100: (20 to 30): (3 to 15), wherein the component A is prepared from polyesterpolyol through vacuum dehydration at the temperature of 100 DEG C to 120 DEG C, the polyester polyol is polysuccinate polyester polyol containing ethylene glycol and diethylene glycol, the ethylene glycol accounts for 50% to 80% (mole percent) of the total amount of the ethylene glycol and the diethylene glycol, the component B is isocyanate, and the component C is a curing agent ingredient and is obtained through dehydrating an alcohol type chain extender and then mixing the dehydrated alcohol type chain extender with a catalyst. The solvent-resistant polyurethane elastomer disclosed by theinvention is low in system viscosity, good in operability, good in solvent resistance and superior and environment-friendly in comprehensive performance, and compared with the ordinary polyurethane elastomers, the solvent resistance is improved to certain extent; and the invention simultaneously provides the easy and feasible preparation method.

The invention relates to a hydrophobic polyquaternary-ammonium-salt antistatic agent for oil products and a preparation method of the hydrophobic polyquaternary-ammonium-salt antistatic agent. The preparation method includes the steps of firstly, dissolving methyl acrylyl oxyethyl trimethyl ammonium chloride, long chain alkyl acrylate and initiator azodiisobutyronitrile into a low-molecular-weight alcohol solvent to form a monomer solution; secondly, adding a hydrocarbon solvent into a container, stirring, heating, and dropwisely adding the monomer solution obtained in the first step after the heating; thirdly, heating after the dropwise adding, and then preserving the heat; fourthly, washing the solution after the reaction in cold water, and stirring fast to obtain a crude product; fifthly, subjecting the crude product to vacuumizing filtration, and then performing vacuum drying to obtain the hydrophobic polyquaternary-ammonium-salt antistatic agent. The testing results obtained by using distilled aviation kerosene and standard base oil as testing oil show that the novel antistatic agent prepared by the method is excellent in antistatic performance and can be used as the antistatic agent for the oil products.