434 results about "Ethyl cellulose" patented technology

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 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 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 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 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 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.

The application relates to the technical field of cough-relieving medicines, and discloses a high-efficiency cough-relieving loquat particle composition which is composed of the following components in parts by weight: loquat leaf extract 30-40 parts; white front extract 10-15 parts; platycodon grandiflorum extract 6-10 parts; white mulberry bark extract 18-25 parts; stemona sessiliflora extract 7-10 parts; menthol 0.1-0.5 part; polyethylene glycol 2-5 parts; mannitol 8-12 parts; ethyl cellulose 3-6 parts; hydroxypropyl methyl cellulose 1-3 parts; phosphatidylcholine 1-3 parts; polysorbate 80 1-3 parts; cross-linked sodium carboxymethyl cellulose 4-6 parts; and sucrose 40-60 parts. The double dispersion system combining the immediate-release component and the sustained-release component is adopted, the solubility and the initial release speed of the traditional Chinese medicine extract are remarkably improved through the addition of polyethylene glycol and mannitol, and the technical effect that the drug effect appearing time is remarkably shortened is achieved. Compared with the technical scheme relying on only a single release mode in the prior art, the deficiency that the drug effect is slow and the symptoms of the patient cannot be timely relieved is solved.

The application discloses a preparation method of a low-TCR low-cost ceramic heating tube, and comprises the following steps: (1) preparing an organic carrier: 60 parts by weight of terpineol, 20 parts by weight of ethyl cellulose, 10 parts by weight of a binder and 10 parts by weight of diethylene glycol acetate are placed into a magnetic stirrer and uniformly dissolved and mixed; (2) weighing metal powder: Mo: 50-70 parts by weight; Re: 20-30 parts by weight; Mn: 0-5 parts by weight; Cr: 10-15 parts by weight; by adopting Mo, Re, Mn and Cr in a specific ratio as the metal powder, the traditional mode of adopting metal ruthenium powder or a mixture of metal ruthenium powder and other common metal powder is replaced, the prices of Mo, Re, Mn and Cr are low, so that the preparation cost of the ceramic heating tube is effectively reduced, the purpose of low TCR is achieved, and the scale production is facilitated; meanwhile, the ceramic heating tube prepared by adopting the application has higher overall bending strength, and can better meet the use requirement.

The present invention provides a solid dispersion of compound 1 or a pharmaceutical salt thereof, comprising the compound 1 or the pharmaceutical salt thereof as an active ingredient and a carrier material, wherein the carrier material is selected from one, two, or more of polyvinylpyrrolidone (PVP), copovidone, polyvinylpyrrolidone-vinyl acetate copolymer, hydroxypropyl methylcellulose acetate succinate, polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer, hydroxypropyl methylcellulose, polyethylene glycol, and ethyl cellulose, enabling the drug to have good stability, dissolution, and therapeutic effects. The formulation of the present invention provides rapid drug release and can reduce the oral burden of large-dose tablets on menopausal patients, thereby improving treatment compliance and treatment efficiency.

This invention relates to the field of concrete technology, specifically to a self-healing concrete material, its preparation method, and its application. The self-healing concrete material is a core-shell structured microcapsule, comprising a core material and a wall material. The wall material wraps around the core material. The core material comprises the following raw materials in parts by weight: 4-6 parts β-cyclodextrin, 12-18 parts sepiolite powder, 5-10 parts shellac powder, 25-35 parts sulfoaluminate cement, 10-15 parts magnesium oxide, 12-16 parts sodium silicate aqueous solution, and 14-17 parts calcium carbonate. The wall material comprises the following raw materials in parts by weight: 20-30 parts polyvinyl alcohol, 20-30 parts ethyl cellulose, 15-25 parts bentonite, and 25-35 parts corn starch. The mass ratio of the core material to the wall material is 6-7:3-4. The core material of the self-healing concrete material provided by this invention, comprising β-cyclodextrin, sepiolite powder, and shellac powder, can improve the problems of slow repair speed and poor reinforcement effect of self-healing materials.

The invention discloses metronidazole particles, a preparation containing the metronidazole particles and a preparation method of the metronidazole particles. The metronidazole particle comprises a drug core and a coating layer, wherein the coating layer is coated on the outer surface of the drug core; the medicine core comprises metronidazole; the coating layer comprises a film-forming material, and the film-forming material comprises gastric-soluble acrylic resin and ethyl cellulose. The metronidazole granule has low dissolution rate in water and a medium with high pH (such as pH 6.8), especially the dissolution rate in 15 minutes is less than or equal to 10%, the dissolution rate at low pH (such as pH 1.2-4.5) is consistent with the dissolution rate of commercially available tablets, and the metronidazole granule is rapidly dissolved out.

The invention relates to a colla corii asini-concha haliotidis compound as well as a preparation method and application thereof, and belongs to the technical field of medicines and health-care products. The colla corii asini-concha haliotidis compound provided by the invention comprises the following components in parts by weight: a) 38-42 parts of colla corii asini; b) 15-25 parts of concha haliotidis; and c) 1-5 parts of an auxiliary material, wherein the auxiliary material is selected from one or more of polyvinylpyrrolidone, copovidone, hydroxy propyl cellulose and hydroxyethyl cellulose. The donkey-hide gelatin and concha haliotidis compound is prepared by using a hot melt extrusion technology, so that the smell, wettability, dispersity and other properties of the donkey-hide gelatin are obviously improved, and the donkey-hide gelatin compound shows a good effect in an osteoporosis rat model and a calcium-deficient mouse model. The preparation process is simple and controllable, and has a good market prospect.

The application discloses a functional probiotic microencapsulated intestinal shield system and a preparation method and application thereof. A core layer comprises four probiotics, i.e., lactobacillus acidophilus La-14, animal bifidobacterium Bb-12, lactobacillus rhamnosus GG and lactobacillus reuteri DSM 17938, and the weight ratio is 3:4:2:1, and the total viable bacterial count is greater than or equal to 10^10 CFU / g. An inner layer is a targeted release control layer, which is composed of ethyl cellulose, polylactic acid, chitosan and lactose, can swell in a pH 5.5 to 6.5 environment and can dissolve in a pH 6.8 to 7.2 environment. A middle layer is a buffer protection layer, which is composed of calcium carbonate, disodium hydrogen phosphate and sodium alginate, and can maintain the internal pH of the microcapsule at 4.5 to 5.5 in a gastric acid environment. An outer layer is an intelligent response protection layer, which is composed of konjac glucomannan, xanthan gum and gum arabic, and can form a protective film in a gastric acid environment with a pH less than 3.0 within 5 minutes. Through the synergistic protection of the four-layer microcapsule structure, the probiotics can achieve a high survival rate in the gastric acid environment of cats, and can be accurately released at specific positions in the intestinal tract, which is helpful to improve the intestinal health of cats.

The present application relates to the technical field of oil exploitation, in particular to a profile control water plugging agent, a preparation method and application thereof. The method comprises the following steps: (1) mixing a cellulose compound, acrylamide and water, then adding a crosslinking agent, and then adding an initiator to perform a polymerization reaction; (2) mixing the material obtained in the step (1) with a metal salt solution, and then performing solid-liquid separation and drying; wherein the cellulose compound is selected from one or more than two of carboxymethyl cellulose, carboxyethyl cellulose and polyanionic cellulose. The profile control water plugging agent is a hydrogel material with a unique double network structure, and has good stability and still maintains good strength under high temperature and high salt conditions.

The invention relates to the technical field of lithium ion batteries, and discloses a high-safety semi-solid lithium battery, which comprises a positive electrode, a negative electrode, a diaphragm and a semi-solid electrolyte, the electrolyte is prepared from trimethyl phosphate, lithium bis (fluorosulfonyl) imide, cyanoethyl cellulose, a cation competitive coordination agent and an optional interface regulator; the solvation structure is regulated and controlled by utilizing a cation competitive coordination mechanism, the activity of a free solvent is reduced, and the problem of poor compatibility of phosphate and a negative electrode is solved; based on thermal reversible physical crosslinking characteristics of cyanoethyl cellulose and cations, the problem of large contact impedance between solid phases and solid phase interfaces is solved by adopting a process of high-temperature low-viscosity liquid injection infiltration and room-temperature in-situ curing molding; meanwhile, uniform deposition of lithium is induced by virtue of an electrostatic shielding effect of multivalent cations, dendritic crystal growth is inhibited, the battery has intrinsic flame-retardant characteristic, interface stability and long cycle life, and the technical problem of a high-energy battery is solved.

The application discloses a waterproof makeup composition in the field of cosmetics and a preparation method thereof. The composition comprises a self-repairing organic silicon polyurethane elastomer, double-hydrophobic modified nano silicon dioxide, cyclopentasiloxane, red iron oxide, hydroxyethyl cellulose, polyglyceryl isostearate, sodium hyaluronate, phenoxyethanol, vitamin E acetate and deionized water. The preparation process comprises the following steps: dissolving the self-repairing organic silicon polyurethane elastomer in cyclopentasiloxane to form an oil phase; dissolving hydroxyethyl cellulose in water and then adding other components to form an aqueous phase; mixing and emulsifying the two phases, adding double-hydrophobic modified nano silicon dioxide and other components for grinding, and finally adjusting the pH value. The composition has excellent waterproof performance, long-lasting makeup effect and self-repairing function, and has good skin compatibility.

The application provides a preparation method of a water-resistant intelligent colorimetric label for indicating food freshness, and belongs to the technical field of food packaging. A mixed dye is prepared by taking methyl red and bromothymol blue as raw materials, then the aqueous phase solution is obtained by adding the mixed dye into a chitosan gelatin solution, and the aqueous phase solution is added into an oil phase containing an emulsifier to perform emulsification and crosslinking, so that pH color developing microspheres are formed, and finally, the pouring method is adopted to prepare the water-resistant intelligent colorimetric label for indicating food freshness. The colorimetric label prepared by the application embeds the methyl red and the bromothymol blue in the ethyl cellulose film by using the microsphere method, which not only ensures the response of the colorimetric label to the acidic gas, but also avoids the influence of the environmental humidity on the indication accuracy, and the methyl red and the bromothymol blue cannot be dissolved out under high humidity, so that the stability of the film in the high humidity environment is ensured.

In this ethyl cellulose derivative, some of hydroxy groups of ethyl cellulose are substituted with one or more groups selected from an acetyl group, a propionyl group, and a butyryl group. A value obtained by dividing the Young's modulus MPa of the ethyl cellulose derivative by the specific surface area m2 / g is 50.0 or less.

The invention belongs to the technical field of biological medicine, and particularly relates to a ganoderma lucidum polysaccharide sustained-release liver protection preparation and a preparation method thereof.The preparation comprises a pellet, the pellet comprises a pellet core, a medicine layer, an inner sustained-release layer and an outer mucous membrane attachment enteric-coated composite layer, and the pellet core is coated with the medicine layer, the inner sustained-release layer and the outer mucous membrane attachment enteric-coated composite layer in sequence; the medicine layer contains high-purity ganoderma lucidum polysaccharide; the inner slow-release layer is composed of ethyl cellulose, triethyl citrate and polyethylene glycol 4000; the outer mucous membrane attachment enteric composite layer is formed by compounding chitosan and a pH sensitive polymer, preferably, an in-situ network structure is formed through calcium ion crosslinking, and the outer mucous membrane attachment enteric composite layer has the enteric function and the mucous membrane attachment function. The invention aims to solve the problems that the existing ganoderan preparation is too fast in release, large in blood concentration fluctuation and short in action time. Through the synergistic effect of the structures, the ganoderma lucidum polysaccharide sustained-release liver protection preparation is stable in stomach, targeted in intestinal tract release and retained in mucous membranes, the sustained-release effect of 12 h or above is achieved, and the bioavailability and the liver protection curative effect are remarkably improved.

The present application provides a composition for preparing an aerosol-generating substrate, the aerosol-generating substrate being prepared by an integral molding process, the composition comprising: a plant component; a smoke agent component; a binder component; a fat-soluble perfume component; and ethyl cellulose. The invention also provides an aerosol generating matrix prepared by using the composition provided by the invention. Aerosol-generating substrates prepared using the compositions of the present application have improved formability and perfume retention.

This invention relates to the field of ceramic materials, specifically 98% alumina photovoltaic insulating ceramics. The 98% alumina photovoltaic insulating ceramics are prepared by the following steps: preparation of a toughening agent; airflow mixing of alumina powder and a composite sintering agent; preparation of a ceramic composite slurry; and sintering of the ceramic composite slurry. This invention prepares a toughening agent with single-walled carbon nanotubes, silicon nitride, and zirconium dioxide as its main components. The modified single-walled carbon nanotubes possess excellent mechanical properties and thermal conductivity. The system formed by silicon nitride, zirconium dioxide, and ethyl cellulose simultaneously enhances the stability of the toughening agent. During subsequent sintering, the decomposition products of ethyl cellulose prevent the decomposition of silicon nitride, allowing silicon nitride and zirconium dioxide to better inhibit the growth of alumina grains, thus significantly improving the toughness of the alumina ceramic. Adding this toughening agent to alumina ceramics can greatly hinder the generation and propagation of ceramic cracks, thereby improving the toughness of the 98% alumina photovoltaic insulating ceramics.

The present application relates to the technical field of burst beads, and particularly relates to a burst bead with anti-freezing performance and a preparation method thereof. The structure of the burst bead comprises wall material wrapping core liquid. The raw material of the wall material comprises a first colloid, a second colloid and an anti-freezing agent. The first colloid comprises alginate. The second colloid comprises at least one of carrageenan, polyethylene glycol, gum arabic, ethyl cellulose and guar gum. The raw material of the core liquid comprises a metal ion salt and an anti-freezing agent. The metal ion salt comprises calcium salt. The anti-freezing performance of the burst bead is improved by adjusting the formula of the burst bead production, adding the second colloid and the anti-freezing agent in the raw material formula of the wall material, and simultaneously adding the anti-freezing agent in the raw material formula of the core material. The adaptability of the burst bead wall material to environmental changes is improved. The burst bead wall material reaches the thermal expansion and contraction synchronously with the core liquid. When the environmental temperature changes, the burst bead wall material expands and shrinks with the volume increase and decrease of the core liquid. The burst bead is not easy to produce bubbles and breakage, and the anti-freezing performance is improved.

The invention provides an effervescent tablet containing active probiotics and a preparation method thereof, and relates to the technical field of food and health care product processing. The preparation method of the effervescent tablet containing the active probiotics comprises the following steps: (1) acid granulation: coating an acid material with hydroxypropyl methylcellulose, and mixing with an adhesive and PEG 6000 for granulation; (2) alkali granulation: coating an alkali material with ethyl cellulose, mixing the coated alkali material with microcrystalline cellulose and an adhesive for granulation, and mixing with PEG (Polyethylene Glycol) 6000; (3) mixing the probiotic mixture by adopting an equivalent incremental method; (4) pre-pressing 30-40 kN of the acid particles to obtain an acid layer; and then sequentially filling a probiotic mixture and alkali particles, and finally pressing under the pressure of 50-60kN. According to the effervescent tablet containing the active probiotics, a double-layer tabletting technology is adopted, the survival rate of viable probiotics in the effervescent tablet is increased, and the disintegration time limit is shortened; and uniform bubbles and clear solution in the effervescing process are ensured.