20results about How to "Reduce apparent viscosity" patented technology

The present application provides a kind of cellulose fiber and its preparation method, first NMMO aqueous solution is heated and stirred, and cellulose raw material is added to the prepared NMMO aqueous solvent, and heated and stirred;Then the blend after swelling is dissolved by stirring and vacuumizing, and then the obtained cellulose solution is continuously heated and stirred, while adding spinning aid, after stirring, centrifugal spinning dope is obtained, finally the obtained spinning dope is injected into syringe, and cellulose filament is spun at low temperature by push pump.The method can reduce the temperature of cellulose spinning relative to the spinning method of NMMO water system, and can effectively reduce the energy consumption of industrial production of cellulose fiber, and the method is obvious at low cellulose concentration, which has great economic advantage in the differentiation production of lyocell fiber.

This invention relates to the field of biosensing technology, providing a self-driven sorting device with a near-field direct-write gradient grid and its fabrication method. The invention aims to solve the problems of existing microfluidic sorting devices, such as reliance on external power, susceptibility to stacking and clogging, and severe human background interference. The device constructs a spatially heterogeneous geometric topological grid in situ on a porous substrate using a near-field direct-write process, forming a three-level gradient path consisting of a primary coarse filtration zone, a secondary sorting zone, and a tertiary retention zone. This invention utilizes substrate capillary forces to drive sample flow and achieves physical guidance and precise retention of human cells through a deterministic lateral displacement mechanism. While significantly increasing sample processing throughput, it drastically reduces the proportion of human reads in sequencing, providing a convenient and efficient technical platform for automated preprocessing of complex biological samples and high-sensitivity clinical detection.

This invention belongs to the field of food processing technology, specifically relating to a processing technology for low-fat meat products based on gelation technology. The process includes: dispersing polysaccharide gel components and microcrystalline cellulose in water, heating to swell, and then cooling to form a composite gel system; introducing air bubbles through mechanical stirring and controlling temperature to solidify and form a porous gel; improving pore wall stability through low-temperature regulation and gel aging treatment; obtaining micron-sized porous gel particles through low-shear granulation; vacuum impregnating a high-viscosity hydrophilic polysaccharide solution with shear-thinning properties under reduced pressure; mixing the obtained porous gel particles with minced meat, shaping, and heating to obtain the low-fat meat product. This invention, by constructing a porous gel structure to store lubricating factors, achieves gradual release during chewing. Without adding any exogenous oils, the coefficient of friction is reduced by more than 20%, effectively solving the technical problems of dry texture and poor lubricity in low-fat meat products, and has good industrial application prospects.

This invention discloses a coal gangue grouting and filling material with high rheological resistance and resistant to bleeding, its preparation method, and its application, relating to the field of mine filling material technology. The grouting and filling material, by mass percentage, comprises: 70%~75% coal gangue, 0.55%~2.3% composite rheology modifier, and the balance being water; wherein the composite rheology modifier includes an air-entraining agent and a dispersant, with a mass ratio of (90~99):(1~10); the air-entraining agent is a surface-active foaming material, and the dispersant is a phosphate additive. In its preparation, coal gangue is first mixed with water and stirred to obtain an initial slurry; then the air-entraining agent and dispersant are mixed to prepare the composite rheology modifier; finally, the composite rheology modifier is added to the initial slurry and stirred until homogeneous to obtain the grouting and filling material. This grouting and filling material uses coal gangue as the main raw material, has a simple preparation process, and possesses excellent fluidity, stability, and pumpability.

The invention discloses a preparation method of a high-rigidity PP hollow grid plate based on dolomite grading enhancement, which comprises the following steps: based on the design of multistage inorganic powder grading filler, taking dolomite powder, calcium carbonate and talcum powder, stirring and premixing to obtain a premix, then adding ionic liquid, and heating by stirring type microwave equipment to obtain the high-rigidity PP hollow grid plate based on dolomite grading enhancement. Then adding a surfactant and an organic oligomer, and continuing to stir and react to obtain a surface activated and modified graded filler; the preparation method comprises the following steps: stirring and blending the graded filler and PP resin to obtain a blended material, and then adding the blended material into a closed rubber mixing mill for pre-plasticizing treatment to obtain a mixture melt; the mixture melt is subjected to vibration compaction treatment and then plasticized and granulated again, plastic master batches are obtained, the plastic master batches and PP resin are taken to be mixed and then subjected to melt extrusion, and the hollow grid plate is obtained through mold forming. The invention aims to solve the problems in the traditional PP hollow grid plate preparation process and improve the comprehensive performance of the hollow grid plate by optimizing the grading of the filler and regulating and controlling the interface characteristics.

The invention discloses an efficient heat dissipation device based on non-Newtonian fluid and metal fins and a preparation method thereof.The efficient heat dissipation device comprises a sealing cover, a base and the porous metal fins, the sealing cover is internally provided with a containing cavity matched with the porous metal fins, the porous metal fins are arranged on the base, and the containing cavity is communicated with the base. The sealing cover covers the base, so that the sealing cover and the base form a sealed cavity structure, a working medium inlet and a working medium outlet are respectively formed in the sealing cover and are connected with an external liquid cooling circulation system, and a cooling working medium is a non-Newtonian fluid; according to the scheme, the non-Newtonian fluid is coupled with the porous fin structure, and the local viscosity of a working medium is actively regulated and controlled by utilizing a high shear field in the porous medium, so that the synergistic strengthening effect of low pump work and high heat exchange is realized.

The invention belongs to the field of new materials and specialty paper, and discloses high-strength PBO composite insulation paper and a preparation method thereof.The preparation method mainly comprises the following steps that the surface of PBO base paper is coated with a blending modified PHA precursor solution, and modified PHA-PBO composite paper is formed; and drying the composite paper, and carrying out hot pressing to obtain the high-strength PBO composite insulation paper. Compared with untreated PBO paper or common PHA-PBO composite paper, the composite paper prepared by the method has the advantages that the porosity of the PBO paper can be greatly reduced, the uniformity of the PBO paper is further remarkably improved, the modified PBO paper with excellent mechanical properties is obtained, the breakdown strength of the PBO paper is further improved, and the insulating property of the PBO paper is improved.

The present invention relates to the field of hydrogel technology, and in particular to a hydrogel ink with thixotropic properties, a preparation method and an application thereof. The hydrogel ink comprises a water-soluble monomer, GelMa, lithium ion, a stabilizer, a chelated ion substance, a photoinitiator and water; the chelated ion substance comprises at least one of aminocarboxylates, hydroxycarboxylates and organic phosphonate compounds. The thixotropic properties of the hydrogel ink of the present invention are different from the general shear thinning phenomenon. In the general shear thinning phenomenon, the apparent viscosity of the liquid decreases with the increase of the shear rate, while the hydrogel ink directly changes from the gel state to the sol state.

The application relates to the technical field of biomedical engineering, and discloses a method for constructing an ex vivo normal-temperature perfusion repair model based on a discarded liver. The method constructs a double-path closed-loop perfusion system, applies a shear stress flow field with low-frequency fluctuation characteristics to a portal vein loop to maintain endothelial function, loads a composite flow field obtained by superimposing low-frequency pulsation and high-frequency micro-shaking on a hepatic artery loop, and significantly reduces microcirculation flow resistance by using the thixotropy and shear thinning characteristics of oxygen-containing perfusion liquid. The system further realizes physical layering of red blood cells and lipids by using acoustic radiation force of a standing wave acoustic flow control layered cavity, and automatically guides a high-viscosity fat-rich flow layer into an adsorption module for specific purification by cooperating with a thixotropic passive shunt valve based on fluid viscosity feedback. Temperature-gas coupling adjustment based on a metabolic temperature coefficient is performed in a rewarming stage. The application solves the problems of microcirculation non-recurrent flow and hyperlipidemia clearance by coupling of multi-dimensional physical fields, and realizes effective repair of the discarded liver.

The invention provides biomass coal water slurry and a preparation method thereof. The preparation method comprises the following steps: mixing biomass with quick lime and water, and hydrolyzing to obtain biomass semicoke; then carrying out pyrolysis on the biomass semi-coke to obtain biomass coke; and finally, mixing the biomass coke with pulverized coal, wastewater and a dispersing agent to obtain the biomass coal water slurry. The biomass is sequentially subjected to two-step hydrolysis and pyrolysis, so that the energy density of the biomass can be effectively improved, and the application feasibility of the biomass in the coal water slurry gasification furnace is greatly improved; the coal water slurry dispersing agent has the advantages that the coal water slurry dispersing agent is added, the grindability and slurry forming property of biomass are improved, the apparent viscosity of the coal water slurry can be reduced, the slurry forming concentration of the coal water slurry is increased, the use amount of the coal water slurry dispersing agent is reduced, the cold gas efficiency of a coal water slurry gasification furnace can be improved during subsequent coal water slurry gasification, and the economic cost is obviously reduced.

The invention discloses a polyacrylamide aqueous dispersion as well as a synthesis method and application thereof, and relates to the technical field of polyacrylamide synthesis. The synthesis method of the polyacrylamide aqueous dispersion comprises the following steps: carrying out a reaction I on a reaction system of acrylamide I, a cationic monomer I, an inorganic salt, a stabilizer, an easily hydrolyzable acrylate monomer and an initiator I to obtain the polyacrylamide aqueous dispersion; wherein the stabilizer is a cationic copolymer of a polyacrylamide chain segment; the prepared polyacrylamide aqueous dispersion has excellent stability, and destabilization does not occur after the polyacrylamide aqueous dispersion is placed at room temperature for more than 6 months.

A cementing isolation fluid composition comprises the following components, measured by mass and weight: 100 parts of water; 30-50 parts of an intelligent responsive amphiphilic block copolymer; 5-10 parts of modified nanocellulose; 2-5 parts of a bifunctional crosslinking agent; 10-15 parts of an environmentally friendly surfactant; 100-200 parts of a nanocomposite weighting agent; and 1-3 parts of a slow-release antioxidant. Through the synergistic effect of the intelligent responsive amphiphilic block copolymer and the modified nanocellulose, the isolation fluid can still maintain good rheological properties under the conditions of 200°C and 100MPa, and the apparent viscosity reduction is less than 20%. The PNIPAM block provides temperature responsiveness, the PDEAEMA block provides pH responsiveness, and the PSS block provides salinity responsiveness, so that the isolation fluid can adaptively adjust its structure and performance according to the downhole environment.

The present invention relates to the field of polymer materials, and in particular to a composite material for a ship propulsion system and a preparation method thereof. The composite material comprises the following components, measured by weight: 45-60 parts of ultra-high molecular weight polyethylene, 5-10 parts of perfluoropolyether acrylate copolymer, 10-15 parts of ethylene-octene copolymer elastomer, 3-5 parts of nitrile rubber, and 4-8 parts of ionic liquid grafted MXenes. According to tests, the composite material prepared by the present invention has a lower dry friction coefficient and a wet friction coefficient under water lubrication conditions, a small volume wear rate, and can be suitable for a water-lubricated stern bearing of a ship propulsion system.

The invention provides a kitchen and bath composite board and a preparation process thereof, and relates to the technical field of building decoration materials, the kitchen and bath composite board comprises a core layer and two surface layers, the core layer is of an extruded polystyrene foam structure, the two surface layers are compounded on the two opposite sides of the core layer, and the surface layers are of stone-plastic composite structures; wherein each stone-plastic composite structure is an integrated plate layer formed by co-extruding a first component and a second component. The composite board is formed by compounding a hydrophobic extruded polystyrene foam structure and a stone-plastic composite structure, and the whole structure does not contain hydrophilic wood fibers, so that the problems of expansion, deformation and cracking caused by moisture absorption are fundamentally avoided, the dimensional stability and the physical performance can be kept for a long time in high-humidity environments of kitchens and bathrooms, and mold breeding is effectively inhibited.

This invention discloses a highly dispersible carbon nanotube conductive slurry and its preparation method. The conductive slurry is composed of a first polar aprotic solvent, multi-walled carbon nanotubes, a conjugated electron acceptor type intercalation inducing agent, and a cold-state low-viscosity polymeric adhesive. The cold-state adhesive contains fluorinated polymers such as polyvinylidene fluoride (PVDF). During preparation, the solvent, carbon nanotubes, and inducing agent are first heated and held at a constant temperature to achieve charge transfer complexation and pre-loosening; then, the pressure is reduced to allow the solvent to undergo micro-boiling flash evaporation to expand the inter-tube gaps; next, under pressure holding conditions, the cold-state adhesive is injected using a pressure difference, and the local negative pressure generated by condensation and contraction introduces the polymer into the carbon nanotubes to complete electrostatic anchoring; finally, the pressure is restored to normal and homogenized for degassing. This invention achieves non-destructive deep dispersion of carbon nanotubes through the synergistic effect of chemical pre-loosening and hydrodynamic pumping, significantly reducing the apparent viscosity of the slurry and effectively preventing carbon nanotube framework breakage and secondary agglomeration.

The invention discloses a slurry system suitable for complex rock stratum drilling and a preparation method and application thereof, the slurry system is composed of bentonite slurry and rock slag, and 23-41 g of rock slag is added into every 100 mL of bentonite slurry; the bentonite slurry is prepared from the following raw materials in parts by weight: 1 to 8 parts of bentonite, 0.03 to 0.32 part of sodium carbonate, 0.1 to 1 part of filtrate reducer, 0.1 to 0.5 part of coating inhibitor, 0.10 to 0.15 part of viscosity reducer and 100 parts of water. The raw material components are uniformly mixed and stirred, and an alkali solution is added to adjust the pH value to be neutral or alkalescent, so that the slurry system suitable for complex rock stratum drilling can be prepared. The slurry system can be used for preparing drilling fluid for complex rock stratum drilling in the Ordos region and the like. The problems that in the existing complex rock stratum drilling process, the rock slag amount is large, the inferior solid phase invasion concentration in mud is high, and the rheological property, the filter loss and the mud cake quality are difficult to control can be solved.

The application relates to the technical field of quartz melting equipment, and discloses a pressure control device for preparing fused quartz products by a high-temperature melting and casting method, which comprises a base, a material injection pipeline rotatably arranged on the base, a vibration pressure reduction mechanism, a driving mechanism and an adjusting mechanism arranged on the base; the vibration pressure reduction mechanism is used for driving the material injection pipeline to reciprocatingly swing based on an axis to form a shearing force on a melt; the driving mechanism is used for driving the vibration pressure reduction mechanism to operate; and the adjusting mechanism is used for adjusting the reciprocating swing frequency of the material injection pipeline according to the discharging speed of the quartz melt. The pressure control device for preparing fused quartz products by the high-temperature melting and casting method drives the material injection pipeline to reciprocatingly swing based on the axis through the vibration pressure reduction mechanism, applies an alternating shearing stress to the quartz melt to reduce the apparent viscosity of the quartz melt, and automatically adjusts the swing frequency through a transmission assembly according to the discharging speed change of the impeller, so that negative feedback self-adaptive control of the melt pressure is realized.

The invention provides a nonionic polymer and application thereof in soil improvement, and belongs to the technical field of soil improvement. The preparation method comprises the following steps: controlling reaction conditions, taking an acrylamide monomer as a raw material, and taking a mixture of polyethylene glycol and sodium tripolyphosphate as a dispersing agent, so as to prepare the nonionic polyacrylamide. The non-ionic polyacrylamide prepared by the method provided by the invention is relatively thorough in reaction, few acrylamide monomers are remained in the product, and the obtained colloid product has the characteristics of high intrinsic viscosity and low apparent viscosity; when the polymer is applied to a soil conditioner, the water content and the water retention rate of soil can be improved.

The invention belongs to the technical field of composite solid propellants, and provides a fusion casting type low-cost thermoplastic composite solid propellant and a preparation method of the fusion casting type low-cost thermoplastic composite solid propellant. 10-20% of a thermoplastic elastomer adhesive; 3-20% of a plasticizer; 5-20% of a metal fuel; and 0-5% of an auxiliary agent. The functional additive is at least one of a process additive and a combustion performance regulator, and the metal fuel is spherical aluminum powder or zirconium carbide powder. According to the prepared thermoplastic composite solid propellant, mixing and pouring can be independently carried out, melt mixing and forming can be achieved at the low temperature (95 DEG C), safety is high, waste products can be recycled and repeatedly processed, the used raw materials are common chemical products in the market, and cost is low. And by adopting a similar casting explosive preparation process, casting explosive equipment can be directly applied, the preparation process is relatively mature, and batch manufacturing of the thermoplastic propellants can be rapidly carried out.

This invention proposes a shale oil viscosity-reducing polymer, its preparation method, and its application, belonging to the field of petrochemical additives technology. The shale oil viscosity-reducing polymer is obtained by grafting maleic anhydride structural units with styrene-maleic anhydride copolymer as the main chain and octadecyl alcohol and ethyl caffeate. The shale oil viscosity-reducing polymer proposed in this invention is mainly used for viscosity reduction in shale oil. Compared with similar products modified only with long-chain alkyl groups, it significantly improves the dispersion and control ability of heavy aggregates, solves the defects of poor oil solubility of single polar polymers and the single viscosity-reducing function of pure long-chain alkyl polymers, and significantly reduces the apparent viscosity of shale oil through multiple synergistic effects, exhibiting outstanding viscosity-reducing performance.