635 results about "Ethyl cellulose" patented technology

The invention relates to the technical field of medicines, in particular to a sustained-release coating as well as a preparation method and application thereof. The coating adopts a three-layer gradient structure design and comprises an inner layer coating, a middle layer coating and an outer layer coating, and the layers are compounded and matched through ethyl cellulose and hydroxypropyl methylcellulose with different molecular weights and are combined with talcum powder filling amount with gradient decreasing and a triethyl citrate plasticizer, so that accurate regulation and control of drug release are realized. Through hierarchical swelling-diffusion dynamic balance, burst release is inhibited, the inner layer has high talcum powder content to resist initial swelling stress, the outer layer has low filling amount to maintain hydrophobic continuity, interface defects are reduced in combination with high-temperature curing, and the release stability and long-term storage performance of drugs such as dihydroergoline mesylate are remarkably improved; the problems of sudden release, damp-heat sensitivity, impurity generation and the like of a traditional single-layer coating are solved.

A multi-fluid kit for three-dimensional printing can include a fusing agent and a nanoparticle-containing agent. The fusing agent can include water and a radiation absorber, where the radiation absorber absorbs radiation energy and converts the radiation energy to heat. The nanoparticle-containing agent can include a liquid vehicle, high density nanoparticles, and a nanoparticle suspension compound selected from the group consisting of terpineol, ethyl cellulose, and a combination thereof.

The invention discloses a preparation method of an ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer, and relates to a preparation method of a urea slow-release fertilizer. The invention aims to solve the problems that the existing nitrogen fertilizer is low in utilization rate and easy to absorb moisture and cake, a polyurethane coating material is non-degradable, and pure ethyl cellulose is insufficient in mechanical strength and limited in water resistance and is not beneficial to being used as a coating matrix of the fertilizer. The method comprises the following steps: 1, preparing an ethyl cellulose cross-linked isocyanate enveloping solution; and 2, preparing the ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer. According to the preparation method, etherified derivative ethyl cellulose of cellulose is taken as a raw material, and the defects that a pure ethyl cellulose membrane is insufficient in mechanical strength, limited in water resistance and low in nutrient separation control precision are overcome by utilizing isocyanate crosslinking modification. The prepared slow-release fertilizer has the advantages of being simple in process, low in cost, environmentally friendly, degradable in matrix, capable of effectively preventing urea from absorbing moisture and caking and the like, and is suitable for large-scale preparation and used in agricultural production.

The invention relates to the technical field of electrolytic copper foil processing, and particularly provides a method for reducing the rough surface roughness of an HVLP copper foil by using a composite additive, which comprises the following steps: step (1): enabling the composite additive to flow into a high-level tank through an additive flow pump, uniformly mixing the composite additive with a copper sulfate electrolyte, and enabling the mixture to flow into a crude foil machine; step (2), then adjusting process parameters of a crude foil machine, including current and line speed of a cathode roller; (3) foil generation and foil drawing are carried out; the composite additive comprises one or two of gelatin and collagen. One or more composite additives composed of gelatin, collagen, sodium dithiodipropane sulfonate, N, N-dimethyl-dithioformamide sodium propanesulfonate, 3-sulfydryl-1-sodium propane sulfonate, hydroxyethyl cellulose and polyethylene glycol are added into the raw foil electrolyte, so that the copper electrodeposition reaction potential can be effectively changed; and uniform and compact copper crystallization peaks are obtained, the rough surface roughness of the raw foil is reduced, and the uniformity of a plating layer is improved.

The invention relates to the field of solder materials, and provides a non-ferrous metal solder for low-temperature brazing and application, the solder is composed of carbon-coated copper nanorods, tin-bismuth alloy-coated silver nanoparticles, 2-mercaptobenzimidazole, rosin resin, an organic active agent, a dispersing agent, ionic liquid, hydroxyethyl cellulose, indium nitrate and citric acid. The silver particles are of a core-shell structure and are coated with tin-bismuth alloy layers, and continuous carbon layers are formed on the surfaces of the copper nanorods, so that the conductivity and the interface stability of the solder are effectively improved. The non-ferrous metal solder with excellent conductivity, low melting point and good wettability is prepared through step-by-step mixing, hot press molding and low-temperature heat treatment processes, and is suitable for electronic device packaging, power device connection and flexible circuit interconnection, and the defects of existing solder in the aspects of low-temperature welding and high conductivity are overcome.

The invention discloses a porous olivine tundish dry material and a preparation method thereof, and belongs to the technical field of tundish dry material processing, the porous olivine tundish dry material specifically comprises the following raw materials by mass: 80-100 parts of a composite sand material, 2-3 parts of silicon powder, 10-15 parts of a composite binder, 15-20 parts of modified aerogel and 4-7 parts of a sintering promoter, heat-resistant whiskers are prepared through a molten salt method, and the porous olivine tundish dry material is prepared through a hot melt method. The preparation method comprises the following steps: preparing a composite binder from a dry tundish material, carrying out centrifugal spinning to obtain modified zirconium oxide fibers with a hollow structure, and further preparing modified aerogel from the modified zirconium oxide fibers, aluminum chloride hexahydrate, hydroxyethyl cellulose and epoxy chloropropane, so that the high temperature resistance and mechanical properties of the cured dry tundish material are improved; and the mechanical property is also improved.

The invention discloses a water-retention synergistic coated slow-release fertilizer and a preparation method thereof, and relates to the technical field of water-retention slow-release fertilizers. The coated slow-release fertilizer sequentially comprises a fertilizer core, an inhibitor layer, a slow-release coating layer, a bonding layer and a water-retaining slow-release layer from inside to outside. Wherein the inhibitor layer is composed of a urease / nitrification inhibitor, the slow-release coating layer is composed of organic polymer resin, the bonding layer is composed of an ethyl cellulose binder, and the water-retaining slow-release layer is composed of a modified water-retaining agent. The coated slow-release fertilizer prepared by the invention has good water retention performance, controlled release performance and salt resistance, is suitable for high-salt soil, and can obviously improve the nitrogen fertilizer utilization rate. Meanwhile, the combination of polyglutamic acid and sulfonic acid groups is used for modifying polyacrylic acid to prepare the modified water-retaining agent, so that a synergistic effect on improving the salt resistance of the coated slow-release fertilizer is achieved, the fertilizer efficiency can be improved, the loss is reduced, the soil environment is improved, and the water-retaining capacity of soil and the utilization rate of the fertilizer are improved.

The invention discloses an efficient anticorrosive coating and a preparation method thereof, and relates to the technical field of coatings. The high-efficiency anticorrosive paint is prepared from a crosslinked membrane modified phytic acid loaded aluminum MCM-41 mesoporous silica composite synergistic filler, a polyurethane / epoxy resin composite emulsion system, titanium dioxide, a BYK-190 dispersing agent, a BYK-021 defoaming agent, a BYK-358N flatting agent, a BYK-425 thickening agent, hydroxyethyl cellulose and deionized water. A cross-linked membrane modified phytic acid loaded aluminum MCM-41 mesoporous silica composite synergistic filler is uniformly dispersed and deeply embedded into a polyurethane / epoxy resin composite emulsion system, countless chemical anchor points are established between the filler and a base material, and the interface bonding property with a resin system is also enhanced, so that the adhesive force of the coating is greatly improved, and meanwhile, the coating has the advantages that the service life of the coating is prolonged, and the service life of the coating is prolonged. And an active and passive three-dimensional protection system formed by the two is used for remarkably improving the corrosion resistance of the coating in the action modes of intelligent response, active repair and physical barrier.

The invention discloses an environment-friendly bio-based coated controlled-release fertilizer with multiple enzymolysis targets and a preparation method of the environment-friendly bio-based coated controlled-release fertilizer, and belongs to the technical field of controlled-release fertilizer production. The environment-friendly bio-based coated controlled-release fertilizer comprises a fertilizer core, an enzyme trigger type internal response layer and a pH sensitive trigger type outer layer, the enzyme trigger type internal response layer is prepared from cationic hydroxyethyl cellulose polyester polyol, an enzyme active site targeting modifier and a degradation accelerator; the pH sensitive trigger type outer layer is prepared from cationic hydroxyethyl cellulose polyester polyol and a covalent self-adaptive network modifier; the outer coating of the fertilizer disclosed by the invention can be degraded under the momentary excitation that the pH value in the coating is reduced after nutrients are released, and can promote degradation microorganisms in soil to be adsorbed to the enzyme-triggered internal response layer, so that the degradation of the internal coating is accelerated. The pH sensitive trigger type outer layer has a promoting effect on the enzyme trigger type inner response layer, and the promoting effect is enhanced by adding the degradation accelerator.

The invention provides sustained-release solid hydrogen peroxide as well as a preparation method and application thereof, and belongs to the technical field of hydrogen peroxide preparation, the sustained-release solid hydrogen peroxide comprises a hydrogen peroxide solution, a stabilizer, an excipient and a sustained-release agent, wherein the slow release agent is a compound of ethyl cellulose and chitosan, and the weight ratio of ethyl cellulose to chitosan is (1-2): 1; the addition amount of the slow-release agent is 0.5%-10% of the total mass of the slow-release solid hydrogen peroxide; according to the invention, ethyl cellulose (hydrophobic barrier) and chitosan (pH response degradation) are combined for use in the sustained-release agent, so that overhigh local concentration caused by concentrated release of hydrogen peroxide is avoided, and the explosion risk is reduced; the preparation method provided by the invention is a crystallization-drying integrated process, the production period can be shortened to 4 hours, while the traditional process needs more than 8 hours, and the energy consumption is reduced by 40%.

The invention provides a lime-sand polymerized building material for inhibiting saltpetering and a preparation method thereof, and belongs to the technical field of novel building materials, the material comprises a composite matrix material, a composite alkali activator, a slow-release organic acid microcapsule, a modified layered double-metal hydroxide and an saltpetering inhibiting auxiliary agent; the composite base material is formed by compounding fly ash and slag; the composite alkali activator is compounded by water glass and a NaOH aqueous solution; the slow-release organic acid microcapsule is prepared by coating a compound acid formed by mixing citric acid and tartaric acid with hydroxypropyl-beta-cyclodextrin and sodium alginate; the modified layered double hydroxide is prepared by calcining MgAl-LDH, then carrying out surface modification by a silane coupling agent, and then loading nano SiO2; the saltpetering inhibition auxiliary agent is compounded by phytic acid modified lignin microcapsules and thermal response carbonate; the phytic acid modified lignin microcapsule is prepared by modifying sodium lignin sulfonate with phytic acid and then coating with ethyl cellulose and polyvinyl alcohol; the thermal response carbonate is prepared by coating calcium carbonate with stearic acid.

The invention relates to the field of hydrophilic thermosensitive resin, in particular to hydrophilic thermosensitive resin as well as a preparation method and application thereof, and aims to solve the problems that an existing thermosensitive material is insufficient in hydrophilicity, an existing hydrophilic material is insufficient in thermosensitive performance, and a resin material cannot give consideration to both the hydrophilic material and the hydrophilic material at the same time. According to the resin, an imidazole structure is introduced into polyacrylamide and grafted into PNIPAM to form an amido bond, the hydrophilic performance of the PNIPAM is improved, ethyl cellulose is grafted onto amino-treated silicon dioxide to form an amido bond, and the hydrophilic performance of the resin is improved together with modified polyacrylamide blended PNIPAM; when the resin is applied to a specific medium or environment, the resin can show a corresponding response behavior on absorption or release of moisture according to the change of environment temperature, realizes effective regulation and control and induction on temperature and humidity, and can be applied to temperature-sensitive medical treatment, electronic packaging and other emerging technical fields.

The invention provides a nicotine orally disintegrating tablet with a multi-layer composite sustained-release structure and a preparation method of the nicotine orally disintegrating tablet. The nicotine orally disintegrating tablet comprises an inner layer, a middle layer and an outer layer, wherein the middle layer and the outer layer sequentially coat the inner layer from inside to outside; the outer layer comprises nicotine, instant starch and a lubricant; the middle layer comprises nicotine, ethyl cellulose, polyethylene glycol and a flow aid; the inner layer comprises the following components: nicotine nanoparticles coated with chitosan and sodium tripolyphosphate, an oral microenvironment regulator and a filling agent. According to the nicotine orally disintegrating tablet provided by the invention, due to the gradient coating structure design of the inner layer, the middle layer and the outer layer, the multi-stage accurate release of nicotine, namely early-stage quick release, middle-stage stable release and later-stage slow release, is realized, the reactions of dizziness, vomiting and the like caused by excessive release of nicotine are avoided, and the use comfort is improved. Meanwhile, the pH value of the oral cavity is adjusted, micro-ecological balance of the oral cavity is maintained, the content of volatile sulfide in breath is reduced, and breath is refreshed.

The invention provides a hydrogel fire extinguishing additive, a preparation method thereof and a fire extinguishing agent. The hydrogel fire extinguishing additive comprises the following raw materials in parts by mass: 1-3 parts of a gelatinizing agent, 1-4 parts of a thickening agent, 1-3 parts of a stabilizer, 2-5 parts of a cross-linking agent, 1-3 parts of a surfactant, 2-6 parts of a phosphorus flame retardant and 3-5 parts of an antifreeze agent. The gelatinizing agent is selected from one or more of methyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose; the thickening agent is selected from one or more of sodium carboxymethyl cellulose, konjac glucomannan, sodium alginate, sodium polyacrylate and xanthan gum; the cross-linking agent is selected from one or more of calcium chloride, magnesium sulfate, calcium sulfate, magnesium chloride, potassium chloride and sodium nitrate. The temperature and pH double-response hydrogel fire extinguishing agent provided by the invention has the characteristics of quick response capability, high-temperature stability, good environmental adaptability, safety and environmental protection, and can be well used for efficient extinguishing and continuous cooling control of a lithium ion battery fire.

The invention relates to the technical field of shoe materials, in particular to a bio-based EVA-containing composite shoe material and a preparation method thereof, and the bio-based EVA-containing composite shoe material is prepared from the following raw materials in parts by weight: a bio-based EVA polymer, bio-based TPU, a cross-linking agent, a compatilizer, a nucleating agent, filler, a foaming agent, a plasticizer, a flexible component, a biodegradation accelerant, a non-polyolefin elastomer and maleic anhydride grafted polyethylene wax. Wherein the compatilizer can be ethylene-vinyl alcohol and the like; the nucleating agent can be nanoscale talcum powder and the like; the filler can be ethyl cellulose and the like; the foaming agent is an azodicarbonamide foaming agent; the biodegradation accelerant is prepared from immobilized lipase, a tannic acid-Fe < 3 + > complex and surface carboxylated TiO2. The preparation method comprises two steps of mixing granulation and supercritical foaming. The composite shoe material provided by the invention has good biodegradability, can reduce environmental pollution, and maintains excellent physical and mechanical properties at the same time.

The present invention discloses a method for preparing a waterproof and oil-proof barrier material and its application in waterproof and oil-proof paper. The method comprises the following steps: dispersing dried nanocellulose particles in an organic solvent, adding a long-chain alkyltrimethoxysilane modifier thereto, wherein the mass ratio of the nanocellulose particles to the long-chain alkyltrimethoxysilane is 1:1-6, to obtain a liquid A; and compounding the liquid A with ethyl cellulose, wherein the mass ratio of the nanocellulose particles to the ethyl cellulose is 5:1-5, to obtain a waterproof and oil-proof barrier material. When the waterproof and oil-proof barrier material is applied to paper, a layer of nanostructure with good film-forming properties is formed on the surface. This structure can resist the penetration of water and grease, and has excellent waterproof and oil-proof green barrier properties.

The invention relates to the technical field of air purifying materials, in particular to a negative oxygen ion air purifying agent and a preparation method thereof.The negative oxygen ion air purifying agent is prepared from ethyl cellulose, hydroxyethyl acrylate, citric acid activated bentonite, beta-cyclodextrine, neodymium-doped tourmaline powder, modified plant essential oil, propylene glycol and carboxymethylcellulose. Sodium polyaspartate and a pH buffer agent. According to the invention, through a triple technology of terpene-free essential oil selection, metal ion modification and beta-cyclodextrin coating, the problem of negative ion consumption of traditional essential oil is avoided, and the release amount and durability of negative oxygen ions are remarkably improved through a catalytic synergistic effect.

The invention discloses a beta-alanine sustained release preparation, the sustained release preparation takes beta-alanine as a core material and a non-allergen wall material as an embedding material, and the non-allergen wall material is pea protein and / or ethyl cellulose. The sustained-release preparation disclosed by the invention is appropriate in release rate, not only can effectively relieve side effects generated after taking beta-alanine, but also can meet the health-care function of improving athletic ability in a short time, so that the beta-alanine sustained-release preparation disclosed by the invention can be widely applied to foods and / or health-care products.

The invention discloses a tooth whitening gel and a preparation method thereof. The tooth whitening gel comprises the following components in percentage by mass: 5%-25% of a film-forming agent, 0.1%-15% of peroxide, 0.1%-15% of a regulator and 45%-94.8% of a volatile solvent, the film-forming agent is modified ethyl cellulose, and the preparation method comprises the step of treating ethyl cellulose by adopting one or more of irradiation, illumination, oxidation, heating, mechanical pulverization and grinding to obtain the modified ethyl cellulose. The preparation method of the tooth whitening gel comprises the step of uniformly mixing the raw materials including the film-forming agent, the peroxide, the regulator and the volatile solvent to obtain the tooth whitening gel. The tooth whitening gel provided by the invention can be ensured not to be dissolved by saliva after being smeared on teeth, and can be ensured to be completely removed when being removed.

The invention discloses a compound rumen bypass guanidinoacetic acid additive as well as a preparation method and application thereof, and belongs to the technical field of animal feed additives. The compound rumen bypass guanidinoacetic acid additive provided by the invention is prepared from the following components in parts by mass: 40 to 60 parts of guanidinoacetic acid, 0.1 to 0.5 part of selenium yeast, 5 to 10 parts of nicotinamide, 5 to 12 parts of DL-methionine, 0.01 to 0.05 part of vitamin B12, 1 to 3 parts of compound probiotics, 3 to 5 parts of hydroxypropyl methyl cellulose, 1 to 2 parts of ethyl cellulose, 15 to 25 parts of hydrogenated palm oil and 3 to 5 parts of glyceryl monostearate. The compound probiotics comprise bacillus subtilis and saccharomyces cerevisiae. The compound additive provided by the invention can significantly improve the daily gain of ruminants and reduce the feed-gain ratio, and meanwhile, due to the improvement of the energy utilization efficiency and the enhancement of the antioxidant ability, the immunity of animals is improved, the morbidity is reduced, and the meat quality is improved.

The invention discloses a friction nano-generator, which comprises an ethyl cellulose modified porous conductive material and a flexible polymer material, wherein the ethyl cellulose modified porous conductive material contains a metal electrode plate, and the flexible polymer material is used for packaging the ethyl cellulose modified porous conductive material. The invention also discloses a preparation method of the friction nano-generator, and the method comprises the following steps: S1, modifying the porous conductive material with a hydrolyzed silane solution, drying the modified porous conductive material, attaching a metal electrode plate to one end of the porous conductive material, and soaking the porous conductive material in an ethyl cellulose solution to obtain an ethyl cellulose modified porous conductive material; and S2, packaging the ethyl cellulose modified porous conductive material by using a flexible polymer material to obtain the friction nano-generator. The friction nano-generator obtained by the invention can collect vibration information in the operation of mechanical equipment, and is applied to vibration waveform recognition as a sensor.

The invention discloses a double-layer microcapsule granule product for soothing nerves and helping sleep and a preparation method thereof, and relates to the technical field of traditional Chinese medicines. The double-layer micro-capsule granule product comprises the following raw materials: a double-layer micro-capsule coating layer and a double-layer micro-capsule granule, the double-layer micro-capsule coating layer comprises the following components: sodium alginate-chitosan and ethyl cellulose; the double-layer micro-capsule granules comprise the following raw materials in parts by weight: 150-200 parts of litsea coreana, 250-300 parts of gastrodia elata and 100-150 parts of American ginseng. According to the physicochemical characteristics of different traditional Chinese medicine effective components, corresponding extraction modes are selected in a targeted manner, and the stability of the medicine is improved; the extracted effective components are wrapped by double-layer wrapping materials, so that the sensory feeling of the traditional Chinese medicine is improved, and the palatability of the medicine and the taking compliance of a patient are improved.

The invention discloses an antibacterial moisture-absorbing fiber fabric and a preparation method thereof, and relates to the technical field of fiber fabrics, the antibacterial moisture-absorbing fiber fabric comprises bacterial cellulose-based antibacterial fibers and polyurethane-based fibers, and the bacterial cellulose-based antibacterial fibers and the polyurethane-based fibers are interwoven to form the fiber fabric. The shell spinning solution is prepared from gelatin, ethyl cellulose and O-quaternary ammonium salt chitosan, the shell spinning solution is prepared from PPC-based polyurethane, and the core-shell structure polyurethane-based fiber is prepared through biaxial spinning, so that the production of the antibacterial, durable and moisture-absorbing fabric is realized, the problem that the fabric is uncomfortable in a humid environment is solved, and the antibacterial, durable and moisture-absorbing fabric is prepared. The durability and the antibacterial property of the fabric are improved.

The invention relates to the technical field of collagen cosmetics, in particular to an anti-aging composition containing collagen as well as a preparation method and application of the anti-aging composition. The anti-aging composition comprises recombinant III-type human collagen and a plant active component, the plant active component at least comprises any one of a fruiting body extract of tremella aurantialba (NAEMATELIA AURANTIALBA) and an extract of gentiana triflora (GENTIANA TRIFLORA), the anti-aging composition also comprises an auxiliary agent, and the auxiliary agent is a mixture of the recombinant III-type human collagen, the recombinant III-type human collagen and the plant active component, and the plant active component is a mixture of the recombinant III-type human collagen, the recombinant III-type human collagen and the plant active component. The auxiliary agent at least comprises any one or more of trehalose, mannitol, carbomer, hydroxyethyl cellulose, glycerol, butanediol and pentanediol. The anti-aging composition not only can achieve a synergistic effect in the aspect of anti-aging effect, but also can solve the problem of insufficient stability of recombinant III-type human collagen to a certain extent through reasonable compounding of the components.

The invention discloses a thermochromic material cable and a preparation method thereof, and relates to the field of power equipment. A thermochromic material cable comprises at least one insulating wire core, an inner wrapping layer is wrapped outside the insulating wire core, a sheath layer is wrapped outside the inner wrapping layer, the insulating wire core sequentially comprises a conductor, a wire sheath and an insulating layer from inside to outside, and the sheath layer comprises the following raw materials in parts by weight: 140-210 parts of a sheath raw material; 1 to 2.2 parts of a thermochromic microcapsule; the raw material of the sheath adopts polyvinyl chloride resin as a base material; the thermochromic microcapsule selects modified melamine-formaldehyde-ethyl cellulose as a capsule wall material and a thermochromic material as a capsule core, the mass ratio of the capsule core to the capsule wall material is (2-2.5): 1, and the average particle size is 0.3-0.7 mu m. According to the thermochromic cable, the high temperature resistance and the ultraviolet resistance of the thermochromic material added into the cable can be improved, so that the thermochromic material cable can realize temperature detection and early warning discoloration for a long time.

The invention relates to the technical field of adhesives, and discloses an acrylate adhesive which is composed of the following components in percentage by weight: 30-40% of butyl acrylate, 2-8% of acrylic acid, 5-12% of methyl methacrylate, 5-10% of 2-ethylhexyl acrylate, 5-10% of 2-ethylhexyl acrylate, 5-10% of 2-ethylhexyl acrylate and the balance of water. The adhesive is prepared from the following components in percentage by weight: 0.5%-2% of a cross-linking agent, 0.2%-2.5% of an initiator, 5%-12% of tackifying resin, 1%-6% of nano silicon dioxide, 0.1%-0.5% of hydroxyethyl cellulose, 0.2%-0.8% of a silane coupling agent KH550 and 25%-40% of a solvent. Through combination of a staged polymerization process and a specific initiator, molecular chain structure distribution is optimized and is obviously improved compared with a conventional product; by combining rosin / terpene resin compounding and nano silicon dioxide modification, the interface stability is kept within the range of-40 DEG C to 150 DEG C, the shear strength retention rate is greater than or equal to 85% after 500 hours of damp-heat aging, and the wide-temperature-range environmental adaptability is remarkably improved.

The invention relates to the field of biological environmental protection, in particular to a heterotrophic nitrification immobilized engineering bacterium for efficient denitrification and a preparation method and application thereof.According to the heterotrophic nitrification immobilized engineering bacterium for efficient denitrification and the preparation method and application of the heterotrophic nitrification immobilized engineering bacterium, polyethylene glycol-glucan two-aqueous-phase concentration and trehalose protection liquid are adopted for synergistic effect, the bottleneck of cell damage caused by a traditional flocculation method can be avoided, trehalose molecules can wrap bacterial cells, and the bacterial cells can be effectively degraded; the immobilized particles can resist osmotic pressure impact and pollutant invasion, the survival rate of thalli is higher than 95%, so that the immobilized particles always keep ultrahigh denitrifying enzyme activity in various sewage environments, honeycomb-shaped pores are formed in an ethyl cellulose matrix, a microenvironment with a high specific surface area is provided for thalli attachment, and the built-in nano zeolite continuously and slowly releases Cu < 2 + > and Zn < 2 + > trace elements, so that the immobilized particles can be recycled. A thallus metabolism enzyme system is synergistically activated, and the denitrification pathway function is enhanced; the chitosan-polydopamine outer coating layer strongly captures the nitrogen-containing pollutants, so that the removal efficiency of the nitrogen-containing pollutants is improved; through triple protection, the density of unit granular bacteria is up to 109 cells / cm, the service life is prolonged, and the denitrification performance is improved by more than 40%.

The invention discloses a high-stability MEMS hydrogen sensor and a preparation method thereof. The high-stability MEMS hydrogen sensor is a semiconductor resistance type hydrogen sensor based on a metal oxide gas sensitive coating and sequentially comprises a silicon nitride supporting layer, a Pt / Ti heating electrode, a sensing electrode, a silicon nitride isolating layer and a metal oxide gas sensitive film from bottom to top. The metal oxides are high-purity antimony doped tin dioxide, tetraamino palladium nitrate and tetraammineplatinum nitrate. The preparation method comprises the following steps: mixing high-purity antimony-doped tin dioxide powder, tetraamino palladium nitrate powder and tetraammineplatinum nitrate powder, preparing gas-sensitive slurry from a mixed solution of terpilenol, diethylene glycol butyl ether acetate, ethyl cellulose, dibutyl phthalate and dioctyl phthalate, dispensing the gas-sensitive slurry on a central interdigital electrode area of an MEMS chip, and performing vacuum drying to obtain the gas-sensitive MEMS chip. And performing vacuum standing and slow heating to obtain the sensor. The sensor is low in detection lower limit and stable in resolution ratio after high-humidity aging.

The invention discloses a preparation method and application of a disilane coupling agent modified composite binder, and particularly discloses a preparation method of disilane coupling agent modified ethyecellulose.The preparation method comprises the steps that a disilane coupling agent is hydrolyzed, specifically, a methacryloyloxy silane coupling agent and an amino silane coupling agent are mixed and then added into a solvent, and the mixture is stirred to be uniform; adjusting the pH value and carrying out hydrolysis reaction to obtain a hydrolyzed silane solution; grafting modification reaction: slowly dropwise adding the hydrolyzed silane solution into the ethyl cellulose solution, and carrying out grafting modification reaction to obtain a silane modified ethyl cellulose solution; and performing rotary evaporation, washing and drying to obtain the product. The invention also discloses the disilane coupling agent modified ethyl cellulose prepared by the preparation method, a disilane coupling modified composite binder, a preparation method of the disilane coupling modified composite binder, and application of the disilane coupling modified composite binder in wet film formation of sulfide electrolyte. The electrolyte membrane prepared by the method is controllable in thickness and high in ionic conductivity, and the electrolyte membrane has relatively high film-forming property and flexibility.

The invention discloses a pH response controlled release type fludioxonil microcapsule pesticide with high slow release performance and a preparation method of the pH response controlled release type fludioxonil microcapsule pesticide. The fludioxonil microcapsule pesticide is prepared from the following raw materials in parts by weight: 0.1-0.3 part of fludioxonil; 0.2 to 0.3 part of ethyl cellulose; 5-10 parts of an organic solvent; 0.05 to 0.1 part of an emulsifier; 1.0 to 2.0 parts of a dispersant; 0.02 to 0.03 part of dopamine hydrochloride; and 20 to 50 parts of deionized water. The invention also specifically discloses a preparation method of the fludioxonil microcapsule pesticide. The invention effectively solves the problem that most of microcapsule pesticides in the prior art only have a slow release effect and cannot realize effective controlled release of pesticides, and the prepared microcapsule pesticide can reduce the use of organic solvents, reduce the production cost and achieve better environmental and ecological benefits.