49 results about "Hydroxymethyl cellulose" patented technology

The invention discloses a wear-resistant high-gloss nano liquid, a wear-resistant high-gloss ceramic tile and a preparation method of the wear-resistant high-gloss ceramic tile, and belongs to the technical field of ceramic manufacturing. The wear-resistant high-gloss nano liquid at least comprises a component A, a component B and a component C which are independently subpackaged, wherein the component A comprises large-particle silica sol, boric acid, sodium methyl silicate, carboxymethyl cellulose sodium, a boronizing stabilizer and the balance of water; the component B comprises a boronizing stabilizer and the balance of water-based modified silicone oil; and the component C is wax emulsion. Through systematic material and process innovation, the ceramic tile which is high in gloss, strong in antifouling property, durable in wear resistance and high in transportation performance is prepared, and the market requirements of surface treatment materials which are high in performance, low in cost and easy to transport are met.

The invention relates to the technical field of lithium battery diaphragms, and provides ceramic affinity type lithium battery diaphragm organic coating slurry and a preparation method and application thereof.The ceramic affinity type lithium battery diaphragm organic coating slurry is prepared from, by weight, 10-12 parts of deionized water, 1-3 parts of ceramic microcapsule particles, 0.1-0.3 part of hydroxymethyl cellulose lithium and 0.5-1 part of solid electrolyte; core materials of the ceramic microcapsule particles are ceramic particles, and wall materials of the ceramic microcapsule particles are organic polymers; the preparation method of the ceramic microcapsule particles comprises the following steps: S1, dispersing deionized water, ceramic particles and a dispersing agent, uniformly stirring, introducing nitrogen, sequentially adding a lithium salt, a coating agent and a pore forming agent, then adding PVDF powder and PMMA powder, and mixing to obtain a pre-agglomerated solution; and S2, carrying out spray drying granulation on the pre-agglomerated liquid to obtain the ceramic microcapsule particles. According to the technical scheme, the problems of insufficient heat resistance and safety of the lithium battery diaphragm in related technologies are solved.

The invention discloses a degradable packaging material capable of controlling the release rate of fertilizer nutrients and a preparation method of the degradable packaging material, and relates to the technical field of agricultural packaging. The material is composed of a base material layer, a slow-release regulation and control layer and a degradation promotion layer, the base material layer provides mechanical support and barrier property, the slow-release regulation and control layer realizes accurate release of nutrients, and the inner surface of the degradation promotion layer is loaded with lipase and carboxymethyl cellulose sodium or a polyvinyl alcohol binder to accelerate degradation. The preparation adopts a multi-layer co-extrusion blow molding blank making and enzyme solution spraying post-treatment process, and the steps are clear and controllable. The material is adjustable in nutrient release, degradable and residue-free after use, suitable for various crop fertilization scenes, capable of improving the fertilizer utilization rate and reducing environmental pollution, and remarkable in practical value, and the mechanical property meets the packaging and transportation requirements.

The application discloses a polymer repair mortar for marine concrete and a preparation method thereof. The polymer repair mortar comprises dry powder mortar and a composite modified polymer. The dry powder mortar comprises 525 cement, an expanding agent, high-activity metakaolin, sand, a water reducing agent, a defoaming agent, latex powder and modified polypropylene fibers. The composite modified polymer comprises water-based epoxy resin, graphene, sodium hydroxymethyl cellulose and amide modified hydrogenated castor oil. The dry powder mortar and the composite modified polymer are mixed uniformly to obtain the polymer repair mortar. The polymer repair mortar improves the impermeability and impact resistance of the repaired marine concrete. The composite modified polymer can form a dense waterproof protective film on the surface of the mortar, effectively reducing the influence of the dry-wet cycle of the sea, chloride ion corrosion and the impact of sea waves. In addition, the adhesion between the repair mortar and the marine concrete matrix is further improved.

The application discloses a preparation method of a hydrocolloid dressing for oral cavity, and relates to the technical field of medical supplies. Baicalin extract and a polyvinyl pyrrolidone solution are mixed to obtain a baicalin extract solution; chitosan fibers, hydroxymethyl cellulose and the baicalin extract solution are mixed to obtain a mixed solution; vacuum degassing: the prepared mixed solution is vacuumized, pressure is maintained, and primary degassing is performed; ultrasonic degassing: the mixed solution after primary degassing is subjected to ultrasonic degassing; static degassing: the solution after ultrasonic degassing is sealed by using a preservative film, and is subjected to secondary degassing at room temperature; a PU film is fixed in a film laying frame, the degassed mixed solution is poured into the film laying frame, and the film laying frame is placed into an air-blowing drying box to solidify and form a protective layer, so that the hydrocolloid dressing is obtained. The hydrocolloid dressing prepared by the method has good adhesion, can be used on a wound for a long time, and can effectively promote the repair of damaged cells and wounds, so that the healing of the wound in the oral cavity is promoted.

The invention belongs to the technical field of coating protection, and particularly relates to a preparation method of a single-component high-temperature fast curing silver-aluminum polymer coating applied to the surface of a coating layer. Comprising 175-180 parts of modified epoxy resin; 95 to 100 parts of flaky aluminum silver powder; 180-200 parts of a mixed solvent of dimethylbenzene and / n-butyl alcohol; 100 to 120 parts of dicyandiamide; 25 to 40 parts of 3-(3, 4-dichlorophenyl)-1, 1-dimethylurea; 10 to 12 parts of sodium molybdate; 4-8 parts of graphite; 1 to 2 parts of polydimethylsiloxane; 2 to 6 parts of a wetting agent HY-352; 3-5 parts of fumed silica; 0.5 to 3 parts of dimethyl silicone oil; and 0.2-2 parts of a hydroxymethyl cellulose agent. The coating disclosed by the invention has the advantages of thin coating, high-temperature rapid curing, relatively good corrosion resistance, good combination with a coating layer and the like, and also has excellent storage stability.

The invention provides a graphitized carburant and a preparation method thereof, and relates to the technical field of carburant preparation. The graphitization carburant is prepared from pretreated petroleum coke, purified graphite electrode waste, wood charcoal, carboxymethyl cellulose sodium and modified starch, wherein the pretreated petroleum coke is obtained by soaking petroleum coke in alkali liquor, cleaning with ethanol, drying, filling oxygen under the pressure of 3-5 Mpa for high-pressure treatment and calcining; the modified starch is obtained by gelatinizing cassava starch, performing microwave shaping and crushing. According to the method, the defects in the prior art are overcome, the purity of the carburant can be effectively guaranteed, meanwhile, the recarburization effect of the carburant is further improved, and the economic benefit of overall production is improved.

This invention relates to the field of biochemistry and molecular biology experimental technology, specifically to an SDS-PAGE gel containing hydroxymethyl cellulose, its preparation method, and its applications. The SDS-PAGE gel is polymerized from acrylamide monomer, N,N'-methylenebisacrylamide, sodium dodecyl sulfate, buffer reagent, initiator system, and reinforcing agent. This gel significantly improves mechanical strength, toughness, and tear resistance while maintaining excellent electrophoretic resolution and transparency, effectively solving the problems of traditional gels being fragile, difficult to handle, and easily damaged during transfer processes. The preparation method of this invention is simple and low-cost, and suitable for biochemical research fields such as protein electrophoresis analysis and Western blotting.

The application relates to the technical field of battery diaphragm, and discloses a high-tension slurry suitable for matrix point coating, a diaphragm and a preparation process. The high-tension slurry suitable for matrix point coating comprises the following components in parts by weight: 0.5-1 parts of a dispersing agent, 15-20 parts of PVDF powder, 45-55 parts of water, 15-18 parts of a thickening agent, 13-23 parts of a binder and 2.5-4 parts of a surfactant. The thickening agent comprises hydroxymethyl cellulose, polyvinyl alcohol and cashew phenol ether compound in a mass ratio of 5:10:1-5. Through the technical scheme, the problems of coating connection, excessively high air permeability and low coating coverage caused by the small slurry tension and large fluidity of the slurry in the matrix point coating in the related art are solved.

The application provides a solid fire-retardant buoyancy material with oil product flocculation and a preparation method and application thereof. The preparation method comprises the following steps: mixing hydroxymethyl cellulose, a binder, ammonium polyphosphate and water to obtain a suspension, mixing the suspension with hollow glass microbeads to obtain hollow glass microbeads coated with ammonium polyphosphate-hydroxymethyl cellulose, mixing the hollow glass microbeads coated with ammonium polyphosphate-hydroxymethyl cellulose with epoxy resin, a diluent, a curing agent and an accelerator and curing and forming to obtain hollow glass microbeads coated with epoxy resin-ammonium polyphosphate-hydroxymethyl cellulose, and reacting the hollow glass microbeads coated with epoxy resin-ammonium polyphosphate-hydroxymethyl cellulose with acrylamide monomers and an initiator to obtain the solid fire-retardant buoyancy material. The solid fire-retardant buoyancy material is prepared by the preparation method. The application also provides application of the solid fire-retardant buoyancy material in inhibiting oil product volatilization. The solid fire-retardant buoyancy material has the advantages of strong oil product volatilization inhibition capacity, superior fire-retardant performance, high mechanical strength, non-toxicity and environmental protection.

The invention discloses a plugging composition for plugging an oil field water flow dominant channel. The plugging composition contains ultrafine powder, a thickening regulator and a filtration regulator, wherein the ultrafine powder is prepared from 40.5 to 69.2 parts of hexagonal calcium silicate, 11.5 to 28.6 parts of calcite, 5.8 to 14.7 parts of clay mineral, 5.2 to 14.6 parts of quartz, 0 to 0.9 part of potassium feldspar, 0 to 2.6 parts of plagioclase, 0 to 0.6 part of dolomite, 0 to 2.1 parts of hornblende, 0 to 0.4 part of gypsum and 0 to 3.8 parts of anhydrite; the thickening regulator is sodium lignin sulfonate, hydroxymethyl cellulose and / or boric acid; the filtration property regulator is a terpolymer of 2-acrylamido-2-methylpropanesulfonic acid / acrylamide / hydroxy carboxylic acid, barium sulfate and / or 1788 type polyvinyl alcohol; the mass ratio of the thickening regulator to the ultrafine powder is (0.05-4): 100; the mass ratio of the filtration modifier to the ultrafine powder is (0.5-5): 100. The invention also discloses a preparation method and application thereof. The plugging composition provided by the invention can be matched with water flow dominant channels of reservoirs with different permeability.

This invention relates to the field of sugarcane cultivation technology, specifically disclosing a method for improving the survival rate of sugarcane seedlings raised from buds. The method includes: cultivating virus-free healthy seedlings using first-generation or second-generation seed stems until they grow to 15-17 buds; removing the sugarcane buds to obtain sugarcane bud segments; disinfecting the sugarcane bud segments; soaking them in a first soaking agent, which consists of the following components by weight: 30-80 parts chitosan-zinc complex, 10-50 parts borax, 0.08-0.2 parts potassium indolebutyrate, 1-3 parts sodium nitrate-naphthaleneacetic acid complex, 0.3-1 part quercetin, 40-80 parts polyvinyl alcohol, 30-60 parts sodium hydroxymethyl cellulose, and 10,000-20,000 parts water; then soaking them in a second soaking agent for a second stage; and finally raising the seedlings. The method of this invention can promote the germination of sugarcane buds, increase the emergence rate of sugarcane seedlings raised by bud removal, improve the quality of sugarcane seedlings, promote the growth of sugarcane seedlings, shorten the seedling raising cycle, and improve the uniformity of emergence, which is conducive to the promotion and application of sugarcane seedling raising and transplanting technology.

The invention discloses a silicon-titanium fertilizer as well as a preparation method and application thereof. The silicon-titanium fertilizer comprises the following raw materials in parts by weight: 15-25 parts of nano silicon dioxide, 0.1-0.5 part of nano cerium oxide, 4-8 parts of nano titanium dioxide, 3-8 parts of magnesium sulfate, 15-20 parts of humic acid, 2-5 parts of nano tourmaline powder, 8-12 parts of ammonium sulfate, 2-4 parts of zinc sulfate heptahydrate, 1-3 parts of copper sulfate, 1-3 parts of ferrous sulfate heptahydrate, 3-6 parts of potassium chloride, 10-15 parts of calcium nitrate, 1-2 parts of nano silver, 0.2-0.3 part of sodium pyrophosphate, 2-5 parts of manganese sulfate and 1-3 parts of ammonium molybdate. 8 to 12 parts of carboxymethyl cellulose sodium and 900 to 1000 parts of water; according to the silicon-titanium fertilizer disclosed by the invention, through selection of various nutrient substances, under the combined action of the nutrient substances, sufficient nutrient substances can be provided for crops, and meanwhile, growth and development and photosynthesis of the crops are promoted, so that the yield of the crops is increased.

The invention belongs to the technical field of degradable mulching films, and relates to a biodegradable mulching film as well as a preparation method and application thereof, and the biodegradable mulching film is prepared from oxidized starch, hydroxymethyl cellulose, trehalose, polyvinyl alcohol and a plasticizer. According to the invention, natural and synthetic biological materials are compounded, so that the water resistance, thermal stability, tensile property and the like of the mulching film are improved; starch and cellulose are used as main materials, so that resource utilization of agricultural wastes is realized, and the preparation cost is reduced; after degradation, nutrient substances necessary for life activity are provided for soil microorganisms to promote reproduction, and the soil structure is improved; environmental pollution caused by the plastic mulching film is reduced, and agricultural sustainable development is facilitated; the preparation operation is simple, the whole process is normal temperature and normal pressure, liquid is converted into a solid film at normal temperature, and the safety is high.

The invention discloses anode foil slurry for an aluminum electrolytic capacitor. The anode foil slurry comprises aluminum powder, a binder, a dispersing agent, a pore forming agent and a solvent, wherein the aluminum powder is spherical aluminum powder, and the binder is one or more of carboxymethyl cellulose sodium, phenolic resin and butadiene styrene rubber; the dispersing agent is one or more of triethanolamine, oleic acid, stearic acid or glycerol; the pore-forming agent is a biomass material and comprises one or more of corn starch, rice starch, sweet potato starch, pea starch and lignin; the solvent comprises one or more of ethanol, ethylene glycol or deionized water. Compared with the prior art, the biomass material is adopted as the pore-forming agent, when the anode foil is prepared, the biomass pore-forming agent occupies the slurry space, pores are formed after the biomass pore-forming agent is decomposed and discharged in the high-temperature sintering process, aluminum powder particles are prevented from being tightly stacked, the specific surface area of the anode foil is increased, and the electrostatic capacity of the anode foil is effectively improved.

The invention provides a gelling agent and a preparation method thereof, and a plugging agent and a preparation method and application thereof. The preparation method of the gelling agent comprises the following steps: mixing 0.5-1.5 parts by mass of hydroxymethyl cellulose, 2-10 parts by mass of acrylamide and 90-110 parts by mass of unsaturated polyester to obtain a mixed monomer, and carrying out polymerization reaction on the mixed monomer under the action of an initiator to obtain the gelling agent. The plugging agent provided by the invention has both mechanical properties and leak-proof and plugging properties.

The present application relates to a kind of water-based hard carbon negative electrode slurry and its preparation method and application, its composition includes the following components: hard carbon: 55~70 parts;20~30 parts sodium polyacrylate modified alkali lignin;Sodium carboxymethylcellulose: 1.5~5 parts;Water: fixed as 100 parts.With water as solvent, by sodium carboxymethylcellulose and sodium polyacrylate modified alkali lignin composition water-based slurry, change traditional organic solvent-based slurry, avoid the volatilization of organic matter in the preparation of slurry and coating process, production does not need additional removal of volatile organic matter.At the same time, the water-based slurry can also effectively improve the poor flowability problem of traditional slurry caused by hard carbon, with good uniformity when coating.

The invention relates to the technical field of high polymer materials, and particularly discloses a degradable composite mulching film material as well as a preparation method and application thereof. Comprising the following raw material components in parts by mass: degradable polyester matrix resin, composite plant fibers, thermoplastic starch, a composite polysaccharide material, an inorganic mineral filler, a cross-linking agent and a plasticizer, wherein the degradable polyester matrix resin is prepared from poly (adipic acid) / butylene terephthalate copolyester, polylactic acid and polypropylene carbonate; the composite plant fibers comprise corn straw fibers, bagasse fibers and microcrystalline cellulose; the compound polysaccharide material comprises chitosan, sodium alginate and carboxymethyl cellulose sodium. The composite mulching film material which is excellent in mechanical property, good in interfacial compatibility and capable of balancing the trial period and the degradation period is successfully prepared by utilizing the synergistic effect of all the raw material components, and the defects that an existing mulching film material is poor in mechanical property and interfacial compatibility, and the use period and the degradation period are difficult to consider at the same time are effectively overcome.

The present application relates to a kind of amino silicone oil emulsion and its preparation method and application, belong to silicone oil emulsion technical field.The present application provides a kind of amino silicone oil emulsion, its preparation method includes, amino silicone oil, cocamide propyl betaine, polyether modified silicone oil are mixed, obtain homogeneous oil phase, gradient is added deionized water, carry out double refinement and obtain homogeneous phase, 3-amino propyl trimethoxysilane and polyether modified polydimethylsiloxane are handled to obtain modified homogeneous phase, again join hydroxymethyl cellulose and porous nanometer silicon dioxide, after mixing, it is obtained.The present application is compounded by amino silicone oil, cocamide propyl betaine, polyether modified silicone oil, amino propyl trimethoxysilane, polyether modified polydimethylsiloxane and porous nanometer silicon dioxide, the stability of amino silicone oil is synergistically improved, and good flexibility and durability are given to fabric.

The invention belongs to the technical field of batteries, and particularly relates to an electrolyte for a lead-carbon storage battery, a preparation method of the electrolyte and the lead-carbon storage battery. The electrolyte for the lead-carbon storage battery is prepared by mixing a sulfuric acid solution and an additive, and the additive comprises the following components: a) sulfate; b) carboxymethyl cellulose sodium; and c) propylene carbonate; when the additive is used for preparing the electrolyte, the addition amount of each component is as follows: the sulfate accounts for 0.1-2.5% of the total mass of the electrolyte; the carboxymethyl cellulose sodium accounts for 0.05%-2% of the total mass of the electrolyte; the propylene carbonate accounts for 1%-8% of the total mass of the electrolyte. According to the invention, the technical problems of serious capacity fading, poor charging acceptance and insufficient low-temperature starting performance of the existing lead-carbon storage battery in a low-temperature environment are solved.

The invention relates to fruit and vegetable juice rich in dietary fibers and prebiotics and a preparation method of the fruit and vegetable juice, and belongs to the field of functional drinks and nutritional and healthy foods. The main component of the fruit and vegetable juice is a dietary fiber compound modified by enzyme-oriented oligomerization and polyphenol crosslinking, and novel small molecule 2, 3-dihydracrylic acid, fructo-oligosaccharide, hydroxymethyl cellulose, vitamin C and sodium citrate are combined, so that the hydratability and dispersity of dietary fibers can be effectively improved, and the metabolic activity of prebiotics in intestinal tracts is enhanced. The prepared fruit and vegetable juice not only shows excellent characteristics in stability, swelling property and taste, but also can effectively promote intestinal health. Compared with the prior art, the invention provides a fruit and vegetable juice product with high stability, high prebiotic activity and good taste, and the increasing requirements of consumers on functional drinks are met.

The high-temperature-resistant ceramic for cooking is prepared from the following components in parts by weight: 10 to 20 parts of albite, 10 to 15 parts of bentonite, 15 to 20 parts of potassium feldspar, 20 to 30 parts of modified polyurethane resin, 6 to 8 parts of modified aluminum oxide, 3 to 5 parts of sodium silicate, 10 to 20 parts of cellulose-based polymer, 2 to 4 parts of titanium oxide, 6 to 10 parts of carboxymethyl cellulose sodium, 6 to 10 parts of sodium polyacrylate and 160 to 180 parts of water. According to the high-temperature-resistant ceramic for cooking and the preparation process of the high-temperature-resistant ceramic, the prepared high-temperature-resistant ceramic for cooking has good high temperature resistance and thermal shock resistance.

The application discloses a ternary composite carrier material, characterized by being composed of any three components selected from the following cellulose components and silica components: the cellulose components include hydroxymethyl cellulose, hydroxypropyl methyl cellulose, microcrystalline cellulose, siliconized microcrystalline cellulose, hydroxyethyl cellulose, ethyl cellulose and hydroxypropyl cellulose; and the silica components include colloidal silica, fumed silica, hydrophobically modified silica and micronized silica; the fumed silica includes fumed hydrophilic silica. The product prepared by the application has a strong synergistic effect. The product has good flowability, strong formability, low hygroscopicity, high uniformity, excellent stability and wide versatility, and can be widely applied to the fields of medicine, food, veterinary drugs, feed, cosmetics and functional powder processing, can completely replace imported high-end products, fills the domestic blank of similar technologies, and has significant application value and market prospect.

The invention relates to an anti-aging and brightening medical sterile dressing and a preparation method thereof, and belongs to the technical field of medical gel. The invention provides an anti-aging and brightening medical sterile dressing, which is prepared from the following raw materials in percentage by mass: 0.01 to 0.5 percent of disodium hydrogen phosphate, 0.01 to 0.5 percent of sodium dihydrogen phosphate, 0.01 to 1 percent of sodium carboxymethyl cellulose, 0.01 to 5 percent of L-lactic acid-sodium carboxymethyl cellulose microspheres and the balance of purified water, the core material of the L-lactic acid-sodium carboxymethylcellulose microsphere is L-lactic acid, and the wall material of the L-lactic acid-sodium carboxymethylcellulose microsphere is sodium carboxymethylcellulose. L-lactic acid-sodium carboxymethyl cellulose microspheres are used as a core component, L-lactic acid promotes subcutaneous collagen generation by activating fibroblasts, a hydrophilic chain of sodium carboxymethyl cellulose can wrap L-lactic acid, hydrolysis and oxidation of L-lactic acid can be delayed, activity of L-lactic acid can be prolonged, free acid concentration of L-lactic acid can be reduced, skin irritation can be reduced, and the skin care effect can be improved. And the skin color achieves the effects of resisting aging and brightening.

The application provides a preparation method of a porous silicon carbide substrate boron-doped diamond thin film electrode, and relates to the technical field of diamond thin film electrodes. The method comprises the following steps: obtaining silica powder, carbon powder and aluminum powder, and mixing the powders to obtain mixed powder; adding the mixed powder into diluted hydroxymethyl cellulose to obtain mixed colloid; according to a preset three-dimensional model, performing three-dimensional printing on the mixed colloid to obtain a precursor, and drying the precursor to obtain a precursor blank; sintering the precursor blank in an inert gas atmosphere to obtain a porous silicon carbide substrate; performing cleaning treatment on the porous silicon carbide substrate, and depositing a boron-doped diamond thin film on the substrate to obtain a boron-doped diamond thin film electrode. The porous silicon carbide substrate is prepared through a simple sintering process, the technical limitations of the existing boron-doped diamond thin film electrode, such as limited specific surface area and low space utilization rate, are broken, and the three-dimensional printing technology is combined to realize mold-free forming of a complex structure.

The invention discloses a steel pipe anti-corrosion coating and a preparation method thereof, and relates to the technical field of coatings. The steel pipe anti-corrosion coating is prepared from functionalized hexagonal boron nitride tannic acid silicon dioxide hybrid particles, high-performance modified waterproof acrylic resin emulsion, titanium dioxide, a BYK-190 dispersing agent, a BYK-011 defoaming agent, a BYK-358N flatting agent, hydroxymethyl cellulose and deionized water. Functional hexagonal boron nitride tannic acid silicon dioxide hybrid particles are uniformly embedded and dispersed in a high-performance modified acrylic resin emulsion matrix to serve as a composite reinforcing main body, and in the curing and film forming process, fluorine-containing chain segments in the hybrid particles and resin spontaneously migrate to an interface of a coating and air and are enriched, so that the coating is formed. The nano-scale low-surface-energy compact outer layer is formed, the hardness of the coating and the adhesive force of the coating to the steel pipe are enhanced, and the corrosion resistance of the coating is remarkably improved by constructing multiple protective barriers integrating active repulsion, physical barrier, chemical inertness and interface strengthening.

The invention provides a preparation method of a porous silicon carbide substrate boron-doped diamond film electrode, and relates to the technical field of diamond film electrodes. The preparation method comprises the following steps: mixing silicon dioxide powder, carbon powder and aluminum powder to obtain mixed powder; adding the mixed powder into the diluted hydroxymethyl cellulose to obtain a mixed colloid; performing three-dimensional printing by using the mixed colloid according to a preset three-dimensional model to obtain a precursor, and drying to obtain a precursor blank; sintering the precursor blank in an inert gas atmosphere to obtain a porous silicon carbide substrate; the porous silicon carbide substrate is cleaned, the boron-doped diamond film is deposited on the porous silicon carbide substrate, the boron-doped diamond film electrode is obtained, the porous silicon carbide substrate is prepared through a simple sintering technology, the technical limitation that an existing boron-doped diamond film electrode is limited in specific surface area and low in space utilization rate is broken through, and the three-dimensional printing technology is combined. And die-free forming of a complex structure is achieved.

The application provides a kind of composite adjuvant for enhancing cellular immunity and its preparation method and application, belong to biological medicine technical field.The adjuvant includes polylysine hydroxymethyl cellulose polymyxin solution and PEG5000-PLA15000-GM-CSF nanoparticle solution;The concentration of the polylysine hydroxymethyl cellulose polymyxin solution is 0.25-4mg / mL, the concentration of the PEG5000-PLA15000-GM-CSF nanoparticle solution is 0.5-2mg / mL;The volume ratio of polylysine hydroxymethyl cellulose polymyxin solution and PEG5000-PLA15000-GM-CSF nanoparticle solution is (2.5-10):1.The composite adjuvant of the application can activate DC cells, induce stronger immune response, and has better antitumor effect when applied to tumor treatment.

A preparation method of superfine iron powder belongs to the field of iron powder preparation, and comprises the following steps: S1, taking high-purity iron oxide red, and carrying out ball milling to obtain iron oxide red powder; s2, adding iron oxide red powder into pure water, then adding the Schiff base-hydroxymethyl cellulose modifier, adjusting the pH value with a citric acid-sodium citrate buffer solution, and performing vacuum freeze drying to obtain mixed powder; s3, the mixed powder is heated, hydrogen is added, heating is conducted for reaction, cooling is conducted, and reduced iron powder coated with a passivation layer is obtained; and S4, adding the reduced iron powder coated with the passivation layer into deoxygenated water, bubbling with N2, adding 3-methacryloyl dopamine and methoxy polyethylene glycol amine, adjusting the pH value with NaOH, stirring at room temperature, carrying out magnetic separation, dispersing in a trehalose aqueous solution, uniformly stirring, and freeze-drying to obtain the superfine reduced iron powder.