139results about How to "Wide range of sources and cheap" patented technology

An edible potato starch composite film as a packaging material of food is prepared from potato starch, thickening agent, and plasticizer through mixing potato starch with water for gelatinizing, adding thickening agent and plasticizer in sequence, stirring, filtering, vacuum defoaming, and filming by the doctor blading method. Its advantages are low cost, high transparency and strength, and full degradation.

The invention discloses a preparation method of an edible collagen composite film, which uses fish skin collagen, chitosan and derivatives thereof as main raw materials, dissolves collagen in distilled water to prepare a collagen aqueous solution, and mixes chitosan And its derivatives are dissolved in dilute acetic acid to make a dilute solution, and then the two solutions are compounded, and a plasticizer is added, and finally the edible collagen composite film is formed into a film. The film has good biocompatibility, degradability and good fresh-keeping function, and its main raw materials and auxiliary materials are edible substances with sufficient sources.

The invention relates to a method for preparing KA oil and derivatives by electrocatalytic hydrogenation of lignin-based phenolic compounds. According to the method, an H-shaped electrolytic cell is used as a container, in a negative pole chamber of the electrolytic cell, carbon fiber cloth is coated with a supported composite catalyst as a working electrode, and the lignin-based phenolic compounds are used as reaction substrates to be dissolved in an acidic solution as a negative pole solution; and a positive pole chamber uses a platinum sheet as a counter electrode and the acidic solution aspositive pole liquid, an electrocatalytic hydrogenation reaction is carried out at the temperature of 30-90 DEG C for 0.5-2 hours, and the KA oil and the derivatives of the KA oil are obtained afterpost-treatment. By the adoption of the method, by adopting the composite catalyst, the service life of the catalyst is greatly prolonged, and the conversion rate of the lignin-based phenolic compoundsreaches over 90-99%, the selectivity of the KA oil and the derivatives of the KA oil reaches over 90-95%, the Faraday efficiency can reach 80-90%, the cost is low, environmental protection is realized, the technological process is simple, the supported composite catalyst is recyclable, the production cost lowered, and the method has the high industrial value.

The invention provides a technology taking lignocellulose type agricultural and forest wastes as raw materials, aiming at the problem in the prior art that the cost of a carbon source in a microalgaeheterotrophic fermentation process. The technology comprises the steps of pre-treating lignocellulose raw materials, saccharifying, carrying out microalgae heterotrophic fermentation, carrying out post-treatment and the like. The technology adopts a strategy combining biological saccharifying of lignocellulose and the microalgae heterotrophic fermentation, so that the production cost of the microalgae heterotrophic fermentation is remarkably reduced, and the comprehensive utilization problem of the agricultural and forest wastes is also solved. Meanwhile, a cellulose preparation for catalyzingthe lignocellulose to be saccharified is adopted, so that the enzyme utilization cost of a saccharifying phase is remarkably reduced. Furthermore, a culture medium at a lignocellulose saccharifying phase and a fermentation culture medium in the technology can be circularly utilized, so that water can be remarkably reduced and the dosage of chemicals also can be remarkably reduced; the technologyhas great significance on industrialization.

The invention provides a clean soil-stabilizing and dust-suppression agent which is composed of, by weight, 2-5 parts of sodium silicate, 0.3-0.6 part of sodium carboxymethylcellulose, 1.5-2 parts of glycerol, 5-10 parts of pure acrylic emulsion, 0.25-1 part of sodium dodecyl benzene sulfonate and the rest of water. The invention also provides a preparation method of the above clean soil-stabilizing and dust-suppression agent. The preparation method comprises the following steps: firstly dissolving sodium silicate and sodium carboxymethylcellulose in water, adding the solution and glycerol into a reaction vessel, fully mixing at the temperature of 40-50 DEG C, adding pure acrylic emulsion, fully reacting and mixing at 25-35 DEG C, adding a sodium dodecyl benzene sulfonate solution, and continuously fully reacting and mixing so as to obtain a clean soil-stabilizing and dust-suppression agent. The dust-suppression agent of the invention has bonding and moisture-absorption effects, and has strong anti-evaporation property and good permeability. Effective dust suppression time is as long as 30 d, and dust suppression efficiency is maintained to be 95% and above.

The invention relates to a preparation method of an alpha-FeOOH nanorod-loading porous charcoal composite material, relates to a preparation method of the porous charcoal composite material, and aimsto solve the problems that an existing method for loading nano particles on a porous carbon material is high in cost, and nanoscale FeOOH particles are easy to agglomerate. The method comprises the following steps: (1) pyrolyzing and carbonizing a charcoal raw material; (2) cleaning the pyrolyzed and carbonized charcoal raw material, drying, immersing into an acidic oxidizing agent solution, heating, flushing, and drying to obtain a porous charcoal material; (3) immersing the porous charcoal material into a ferric salt water solution, stirring, adding a strong alkaline solution, uniformly mixing, putting mixed liquid into a reaction kettle, carrying out hydrothermal reaction, and finally vacuum drying to obtain the alpha-FeOOH nanorod-loaded porous charcoal composite material. Maize strawsas agricultural waste are low in price and easy to get, so that the cost is reduced when the maize straws are adopted as a carbon source. The preparation method of the alpha-FeOOH nanorod-loaded porous charcoal composite material, provided by the invention is applied to the field of biological composites.

The invention relates to a method for preparing spherical nanometer silicon by virtue of a thermal plasma method, and belongs to the technical fields of silicon metallurgy and material preparation. The method comprises the following steps: introducing industrial gas or mixed gas into a plasma generator, performing arc striking to obtain a thermal plasma, causing micron-sized silicon-containing powder to enter a high-temperature thermal plasma region to obtain gaseous silicon atoms and other gaseous particles through carrier gas, and quickly chilling the gaseous silicon atoms and the other gaseous particles to obtain spherical nanometer silicon with nanometer particle sizes of 1 to 100 nm, wherein the micron-sized silicon-containing powder is micron-sized silicon powder, silicon oxide powder, silicon nitride powder or silicon carbide powder. According to the method, the silicon-containing powder such as the silicon powder, the silicon oxide powder, the silicon nitride powder and the silicon carbide powder is adopted as a raw material, and compared with the prior art that silane with relatively high cost is adopted as a main silicon-containing raw material, the method has the advantages of lower raw material cost, higher process safety and the like.

A preparation method of monodisperse high crystallinity copper powder is provided, which relates to a method for preparing copper powder used in conductive paste by using cupreous compound, in particular to a preparation method of the copper powder used in the conductive paste that is applicable to ceramic electronic components with a plurality of layers. The method is characterized in that: cupric salt and copper oxide or copper hydroxide are taken as raw materials, a reductant and a reaction control agent are added into an alcohol-water system and fully mixed, reaction occurs under the conditions that the pH of the solution is 6.0 to 7.5 and the temperature is 50 to 95 DEG C, inert gas is used as carrier gas during the reaction process and the flux of the carrier gas is 50 to 500 ml/min question mark L, then solid-liquid separation, washing and drying are carried out to an obtained product after heat preservation for 1 to 6 h, and the monodisperse high crystallinity copper powder is obtained. The copper powder prepared by the invention is in spheroid shape or polyhedron shape, of which the grains are monodisperse and non-aggregating and have smooth surface, good crystallinity and certain antioxidant capacity. The size distribution of the copper powder is narrow and the average grain size can be regulated between 0.1 and 10 um.

The invention relates to a solid desulfurizer and a production method thereof, in particular to a composite calcium-based solid desulfurizer which is prepared from industrial waste residues and the production method thereof. The desulfurizer is prepared by the following steps of: directly mixing carbide slag slurry, dicyandiamide slag serving as a modifier, a chemical drying agent and magnesium slag powder which serves as another modifier; stirring and mixing; performing wet milling to prepare slurry; performing dry milling to prepare powder; and sieving. The prepared composite calcium-based solid desulfurizer is mainly compounded by calcium hydroxide or calcium hydroxide and calcium carbonate, wherein the desulfurizer contains an active magnesium oxide component, integrates the characteristics of a single calcium base or a magnesium-based desulfurizer and has composite effects. Moreover, the desulfurizer has the characteristics of saving a large amount of energy, protecting environment and reducing the cost of a flue gas desulfurizer, along with cheap and wide raw material resource, large amount of doped magnesium slag, carbide slag and dicyandiamide slag, no heat source, high dehydration speed, stable physical performance and the like; in addition, the desulfurizer has the advantages of small equipment investment, low operation cost, capability of eliminating the damage of limestone exploitation to the environment and the like.

The invention provides a preparation method of a silver nanocluster. The prepared silver nanocluster has high purity and high fluorescence intensity, and is uniform and good in reproducibility. The preparation method is simple, feasible and fast. Raw materials are wide in source and low in price, the preparation process is free of pollution, and the preparation method can be used for large-scale industrialized production. The prepared silver nanocluster is sensitive to the pH value, the fluorescence intensity is enhanced along with the increase of pH, and it is shown that the silver nanocluster can be used as a fluorescence switch to indicate pH changes in a system.

The invention discloses a vanadium-titanium nodular cast iron smelting method which comprises the steps of weighing furnace burden, smelting, spheroidizing and inoculating, wherein the smelting step comprises the sub-steps: adding oxide scale of which the addition amount is 0.5-1.5 percent of the weight of the furnace burden, and adding the oxide scale at the bottom of the furnace burden during smelting and charging; in the smelting step, after the furnace burden is molten down, adding silicon iron into molten iron for regulating the components, so as to achieve the deoxidation effect. The method has the beneficial effects that the low-price oxide scale is added into the bottom of the furnace burden during charging, and the element Ti is oxidized preferentially, so that the titanium content is reduced, the inverse spheroidizing effect of titanium is weakened, nodularizing in vanadium-titanium ductile iron is guaranteed, and a good dephosphorization effect is achieved when the oxide scale is added during smelting; the oxide scale is wide in source and low in price, the oxide scale is reasonably utilized, the production cost can be reduced, and the environment-friendly energy-saving effects are achieved. According to the method, the process is simple, the operation is convenient and the cost is low, and the comprehensive performance of the vanadium-titanium nodular cast iron is guaranteed.

The invention relates to an in-situ powder coating and pole plate preparation integrated method for lithium-sulfur batteries. The method includes: mixing an organic solvent with water, then adjusting the pH value to 8.5 with ammonia water to obtain a mixed solution; dispersing a positive active material and dopamine hydrochloride in the obtained mixed solution to obtain a suspension; heating the obtained suspension to fully volatilize ammonia, and adding a conductive agent and a binder to make a positive slurry; coating a positive current collector with the positive slurry, and performing drying to obtain a positive pole plate. The preparation method realizes integration of positive material powder coating and pole plate preparation, shortens the technological process and the preparation period, and lowers the production cost. Auto polymerization reaction is carried out on dopamine in a weak alkaline environment to form polydopamine, the good film-forming properties of polydopamine are utilized to coat the positive active material so as to improve the cycling stability of lithium-sulfur batteries. The method has the advantages of simple technological process and high production efficiency, and is suitable for large-scale industrial production.

The invention particularly relates to a preparation method of a carbon-silicon composite adsorbent. Firstly, water glass is diluted with deionized water (the volume ratio of the water glass to the deionized water is 1:4), then strong acid ion exchange resin Amberlite IR120H<+> is added while stirring until the pH of the solution is 2, the solution is continuously stirred for 10 h, a filtrate is obtained after filtration, then a proper amount of powdery activated carbon of 200-500 meshes is added, so that the activated carbon accounts for 0.1wt%-2.1wt% of the solution in percentage by mass, the solution is stirred for 1 min and subjected to ultrasonic oscillation for 3 min, a certain quantity of ammonia water solution is dropwisely added, the solution is stirred until the pH of the solution is 7, the solution is left to stand for 12 h and then placed in an isopropyl/n-hexane solution for aging at 60 DEG C for 5-10 h, then a gel mixture is immersed in an isopropyl/n-hexane/TMCS (trimethylchlorosilane) solution for 24 h and then placed in an n-hexane solution for 12 h, filtration is performed, then the hydrophobic gel mixture is dried at the normal temperature and under the normal pressure for 24 h and finally continuously dried at 60 DEG C, 120 DEG C and 150 DEG C for 2 h respectively, and the carbon-silicon composite adsorbent is obtained.

The invention discloses a flexible transparent electrode suitable for a flexible photoelectric device, a battery and a preparation method thereof, and the flexible transparent electrode, the battery and the preparation method use a graphene/MXene/graphene sandwich structure, so that the problem that the conductivity is reduced due to the fact that MXene is oxidized can be effectively avoided. Thegraphene/MXene/graphene composite electrode can simultaneously have the advantages of optics, electricity, mechanical properties, stability, low cost and the like, and can become an excellent flexibletransparent electrode of a flexible photoelectric device.

The invention discloses an organic hetero-junction thin film photoresistor and a photosensitive voltage divider based on organic conjugated molecules. The photosensitive voltage divider is composed of a base, a substrate, a patterning metal electrode layer and a resistive layer which are arranged from the bottom to the top in turn. The resistive layer is composed of a hetero-junction thin film and a phthalocyanine thin film II which are coplanar, and the connection mode of the hetero-junction thin film and the phthalocyanine thin film II is series connection. The hetero-junction thin film and the phthalocyanine thin film II share a segment of metal electrode. Two cheap and common organic dyes of phthalocyanine copper/nitrogen and nitrogen-dioctyl-3,4,9,10-perylene bisimide are utilized for the first time to prepare the organic thin film photoresistor with the maximum linear dynamic range of being up to 81dB, and the voltage divider which is extremely sensitive to weak light irradiation is also acquired so that foundation is established for a later weak light detector and a light detection circuit constructed by all-organic conjugated molecules.