1016results about How to "Reduce release" patented technology

The invention provides a fuel cell hydrogen supply system and a hydrogen supply method. The fuel cell hydrogen supply system comprises a liquid hydrogen storage tank, a first gas path connected between the liquid hydrogen storage tank and a fuel cell, a second gas path connected in parallel with the first gas path, and a control assembly, a gasification device is arranged on the first gas path, and a gas storage bottle is arranged on the second gas path; the control assembly comprises a controller and a plurality of control valves; the controller controls the plurality of control valves and can respectively control the connection or disconnection of the first gas path and the second gas path, so that the liquid hydrogen in the liquid hydrogen storage tank is conveyed to the fuel cell through the first gas path, and when the pressure of the gaseous hydrogen in the liquid hydrogen storage tank exceeds a first preset pressure threshold value, the gaseous hydrogen is stored in the gas storage bottle through the second gas path; and hydrogen can be supplied to the fuel cell through the second gas path. According to the fuel cell hydrogen supply system, gaseous hydrogen exceeding the first preset pressure threshold in the liquid hydrogen storage tank can be recycled, so that the release of the gaseous hydrogen to the outside is reduced, and the waste of resources is reduced.

The invention belongs to the technical field of polyurethane, and particularly relates to a low-reaction-heat mine reinforcing material and a preparation method thereof. Comprising a component A and a component B, the component A comprises polyether polyol A, polyether polyol B, a flame retardant and a catalyst; the polyether polyol A takes a bisphenol compound and sorbitol as a mixed initiator; the polyether polyol B takes cane sugar and sorbitol as a mixed initiator; the component B comprises a prepolymer, a flame retardant and a viscosity reducer; the prepolymer is prepared by prepolymerizing polymerized MDI (Diphenyl Diisocyanate) and polyether polyol C; and the polyether polyol C takes tetrabromobisphenol A and dihydric alcohol as a mixed initiator. The bisphenol compound polyether polyol A and the high-functionality polyether polyol B which are used as specific initiators are mixed, so that the reaction heat is reduced, and the strength of the reinforcing material is improved; meanwhile, polyether polyol C starting from tetrabromobisphenol A is used, so that the flame retardance, the toughness and the strength of the prepolymer are enhanced; the prepared reinforcing material is high in compressive strength and low in reaction heat.

The invention discloses a preparation method of an ultra-thin high-density fiberboard with ultra-low formaldehyde emission, which is characterized by comprising the following steps: peeling wood by using a peeling machine, chipping to obtain wood chips, washing the wood chips with water, cooking in a cooking cylinder, feeding into a defibrator, and adding molten paraffin for treatment to obtain fibers; meanwhile, formaldehyde is taken to be mixed with sodium bentonite, triethylene diamine and polyvinyl alcohol, then urea is added in five times, melamine is added in two times, a reaction is conducted, and melamine modified urea-formaldehyde resin is prepared; taking fibers, applying an adhesive formed by mixing melamine modified urea-formaldehyde resin, nano titanium dioxide and an ammonium chloride curing agent, drying and dehydrating the fibers uniformly mixed with the adhesive, sorting to remove micelles, fiber agglomerates and fiber bundles, and paving and forming to obtain a plate blank; and the plate blank is taken to be subjected to the hot pressing procedure to obtain a plate, and after the plate is cooled, the ultra-thin high-density fiberboard with the advantages of being high in strength, low in formaldehyde emission and the like is obtained after sanding.

The invention discloses a river and lake polluted bottom mud environment-friendly dredging and solidification treatment continuous treatment method, and relates to the technical field of environmental protection engineering.The method comprises the following components of S100, ecological dredging control range and depth, S200, bottom mud conveying and dewatering, S300, solidification treatment and resource utilization, and S400, residual water treatment and recycling. According to the method, the control range and depth of ecological dredging are accurately determined, the influence of the flow speed and the flow direction on migration and transformation of bottom mud pollutants is simulated through a hydrodynamic model, large-scale release of the pollutants in the dredging process is effectively avoided, meanwhile, in the bottom mud conveying and dewatering stage, efficient conveying equipment and an optimized filtering device are adopted, and the efficiency is improved. Disturbance and release of the bottom mud in the conveying and dewatering process are reduced, and the risk of secondary pollution is further reduced.

The invention discloses composite hydrogel as well as a preparation method and application thereof. The curcumin-EGCG composite hydrogel is prepared by forming a complex through hydrogen-bond interaction between gelatin and epigallocatechin gallate and carrying out chemical crosslinking through Schiff base reaction of curcumin and gelatin. The composite hydrogel disclosed by the invention has a self-healing characteristic or viscosity and a shear thinning characteristic, and is beneficial to local application. The composite hydrogel is loose and porous in structure, the drug loading rate can be increased, the drug can be slowly and controllably released, the treatment effect of the composite hydrogel in androgenetic alopecia is promoted, meanwhile, the solubility of a drug monomer can be remarkably improved, and the problem that the drug solubility is low is solved. The composite hydrogel provided by the invention provides an effective transdermal drug delivery preparation for treatment of skin diseases, and has good clinical application prospects and development values.

The invention relates to the field of fertilizers, in particular to a pyroligneous liquor and fulvic acid mixed liquid fertilizer and a preparation method thereof.The pyroligneous liquor and fulvic acid mixed liquid fertilizer is prepared from, by weight, 30-35% of pyroligneous liquor, 25-40% of fulvic acid, 4-6% of amino acid, 5-7% of modified activated carbon and the balance water. The wood vinegar and fulvic acid mixed liquid fertilizer prepared by the invention has good antibacterial performance, and can promote the growth of crops, so that the yield is increased.

The invention discloses a liver-targeting drug liposome and application thereof, and relates to the field of drug delivery, cholate and mannose are used for respectively modifying phospholipid molecules DSPE-PEG2000, two raw materials DSPE-PEG2000-CA and DSPE-PEG2000-MAN composed of the liposome are synthesized, and then the liposome is prepared into the liver-targeting drug liposome. The liposome with liver targeting property is obtained from the liposome, cholesterol, DSPC, DC-cholesterol and a water-soluble therapeutic drug according to a certain proportion, the liposome has relatively high cell safety and liver targeting property, and the therapeutic effect of the corresponding drug can be remarkably improved after the drug is embedded.

The invention belongs to the technical field of preparation of electrode materials, and particularly relates to a high-tap-density spherical ferric sodium pyrophosphate electrode material and a preparation method thereof. According to the preparation method, a uniform precursor is prepared by utilizing solution gel, and a strategy of combining spray drying with secondary sintering is adopted, so that uniform carbon coating and doping modification of ferric sodium pyrophosphate can be successfully realized, and the strategy provides an important experimental basis for an industrialization process of a sodium ion battery. And the method has great potential of large-scale preparation.

The invention discloses a halogen-free flame-retardant reinforced PBT (polybutylene terephthalate) composition as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The halogen-free flame-retardant reinforced PBT composition comprises polybutylene terephthalate, a halogen-free flame retardant, a melamine flame-retardant synergist, glass fibers, a phenol amide metal deactivator, a free radical trapping agent and a hydroperoxide trapping agent. According to the halogen-free flame-retardant reinforced PBT composition disclosed by the invention, under the combined action of all the components, the effects of improving the flame retardance, the ignition temperature of a glowing filament and the heat-resistant stability can be achieved, and the halogen-free flame-retardant reinforced PBT composition has relatively high mechanical properties. The flame retardant property of the halogen-free flame-retardant reinforced PBT composition reaches V-0 or above, the tensile strength is 95 Mpa or above, the glowing filament ignition temperature is 800 DEG C or above, and the thermal weight loss T1% temperature is 335 DEG C or above.

The invention belongs to the field of wastewater treatment. The invention provides a manganese-carbon composite controlled-release material as well as a preparation method and application thereof. The manganese-carbon composite controlled-release material comprises the following components: a manganese-rich mineral, a natural plant carbon source, a cementing material, aggregate, an additive and a foaming agent. The manganese-carbon composite controlled-release material disclosed by the invention can regulate and control the carbon release and manganese circulation process by virtue of the interaction between manganese and carbon, so that the electron transfer and mass transfer efficiency is remarkably improved, synergistic denitrification is realized, the overall denitrification efficiency is remarkably improved, and synchronous nitrogen and phosphorus removal and self-adaptive continuous denitrification are realized. The raw materials required for preparing the manganese-carbon composite controlled-release material are environment-friendly and low in price, the preparation process is simple, the preparation cost is low, and the manganese-carbon composite controlled-release material can be applied to filler in a submerged area of an artificial wetland, a biological filter and a biological retention system, and can be widely applied to application scenes such as tail water advanced treatment of a sewage treatment plant, rural agricultural sewage treatment and initial rainwater purification.

The invention discloses a high-performance sodium-ion battery hard carbon negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing a carbon source precursor with metal chlorate, carrying out a catalytic carbonization reaction at 400-600 DEG C, and after the reaction, carrying out acid pickling and water washing to obtain a solid A; carrying out acid pickling and water washing on the solid A until the solid A is neutral, and carrying out microwave-assisted heat treatment at 1100-1500 DEG C to obtain a solid C; and crushing the solid C and carrying out chemical vapor deposition treatment to finally obtain the high-performance sodium-ion battery hard carbon negative electrode material. The hard carbon material prepared by the method has the advantages of abundant micropore structures, short-distance tight arrangement of layer structures, proper carbon layer spacing and low external specific surface area, and is suitable for a hard carbon negative electrode material of a high-energy and high-power-density sodium ion battery.

The invention discloses a preparation method of a zinc-dihydromyricetin nano-enzyme and application of the zinc-dihydromyricetin nano-enzyme in preparation of drugs for promoting healing of diabetic wounds, and the zinc-dihydromyricetin metal polyphenol nano-enzyme (Zn-DHM) is obtained by coordinating a metal element zinc (Zn) and a natural product dihydromyricetin (DHM) through a one-step method by taking PVP as a surfactant. The Zn-DHM nano-enzyme prepared by the invention has antioxidant property and cell proliferation and migration promoting ability, and can maintain metabolism and immune homeostasis of diabetic wounds, so that the Zn-DHM nano-enzyme can accelerate early healing of the diabetic wounds.

The invention belongs to the technical field of veterinary preparations, and particularly relates to a tilmicosin premix and a preparation method thereof. The tilmicosin premix is prepared from the following raw materials: tilmicosin, a polylactic acid-glycolic acid copolymer, lecithin, modified hydroxypropyl methyl cellulose, grafted polyvinylpyrrolidone, polyethylene glycol and an antioxidant, a solid dispersion is formed through lecithin and grafted polyvinylpyrrolidone, the solubility and stability of tilmicosin are enhanced, polylactic acid-glycolic acid copolymer nano-microspheres are prepared through a double-emulsion solvent evaporation method, slow release of drugs is achieved, dodecyl modified hydroxypropyl methyl cellulose and polyethylene glycol are combined, and the sustained release effect is achieved. The solubility and the slow release characteristic are further enhanced. The activity of the granular premix is effectively preserved, and the granular premix is convenient to use and transport.

The invention belongs to the field of hydrogel preparation, and particularly relates to a preparation method of SA / CS / Ca < 2 + > dual-network hydrogel, an obtained product and application. The sodium alginate / chitosan / calcium ion (SA / CS / Ca < 2 + >) physical cross-linked double-network hydrogel is prepared through a semi-dissolution acidification sol-gel conversion method and an internal gel method, the hardness and chewiness of the hydrogel can be remarkably improved, and the elasticity and cohesiveness of the hydrogel can be improved; freeze-thaw stability research is carried out on the prepared SA / CS / Ca < 2 + > dual-network hydrogel, the influence of freezing temperature, thawing temperature, freezing and thawing cycle times and other conditions on properties such as gel structure, rheology, swelling rate, moisture distribution and the like is explored, and the result shows that when the freezing temperature is-80 DEG C and the thawing temperature is 4 DEG C, the gel subjected to one-time freezing and thawing cycle has good stability. Through detection and analysis, the hardness is relatively high, the elasticity and cohesiveness are also remarkably improved, the elastic modulus (G ') and the viscous modulus (G' ') of the gel are best, the swelling rate is relatively low, the free water content is relatively low, the bound water content is relatively high, and the gel structure is relatively stable.

The invention relates to an antistatic functional plastic and a preparation method thereof, and belongs to the technical field of high polymer materials. The plastic with the antistatic function comprises the following components in parts by weight: 80-100 parts of polystyrene resin, 10-20 parts of glass fibers, 1-5 parts of an antioxidant, 2-8 parts of a light stabilizer, 5-10 parts of a modified antistatic agent and 0.3-0.6 part of a modified flame retardant, anhydride groups in the modified antistatic agent are dehydrated at a high temperature to form a conductive layer, static accumulation is effectively reduced, the anhydride groups and quaternary ammonium salt have a synergistic effect on static elimination characteristics and strong adsorption capacity, and meanwhile, the combustion speed is remarkably slowed down through heat absorption and catalysis of maleic anhydride; in the modified flame retardant, an alpha-amino alkyl phosphonate compound is decomposed to generate phosphorus-containing free radicals, a combustion chain is interrupted, nitrogen is released to inhibit combustion, the alpha-amino alkyl phosphonate compound and DOPO cooperate for flame retardance, the flame retardant efficiency is improved, and the prepared antistatic functional plastic has a good antistatic function and also has excellent flame retardant and tensile properties.

The invention relates to a microbial preparation for regulating oral flora and application of the microbial preparation. A bacterial strain in the microbial preparation for regulating the oral flora consists of a lactobacillus reuteri LR108 bacterial strain and a lactobacillus plantarum LP194 bacterial strain, and the bacterial strain in the microbial preparation for regulating the oral flora consists of a lactobacillus reuteri LR108 bacterial strain and a lactobacillus plantarum LP194 bacterial strain. The microbial preparation can regulate oral flora, has good copolymerization ability and inhibition effect on porphyromonas gingivalis bred in the oral cavity, reduces colonization of the porphyromonas gingivalis in the oral cavity, and reduces inflammatory factors, thereby promoting oral health. Wherein the LR108 strain and the LP194 strain have excellent self-agglutination and hydrophobicity, and have a positive effect on adhesion with intestinal tracts.

The invention discloses a flame-retardant fiber curtain fabric and a preparation method thereof, and relates to the technical field of flame-retardant fabrics, the flame-retardant fiber curtain fabric comprises a fabric substrate and a flame-retardant coating arranged on the fabric substrate, and the flame-retardant coating comprises nano-silica particles and nano-magnesium hydroxide particles in a mass ratio of 1: 1.2-2. The flame-retardant fiber curtain fabric prepared by the invention has remarkable flame retardance and thermal stability, and shows an excellent flame-retardant effect in a high-temperature environment.

The invention discloses biphase gel loaded with natural antioxidants as well as a preparation method and application of the biphase gel. The biphase gel is obtained by mixing oil gel and hydrogel in a mass ratio of (20: 80)-(80: 20) through a physical effect, wherein the hydrogel is composed of a water-soluble natural antioxidant and a polysaccharide aqueous solution; the oleogel is composed of an oleogel agent, a fat-soluble natural antioxidant, a small molecule emulsifier and edible oil. According to the present invention, the water-soluble nutrients are loaded in the hydrogel, and the fat-soluble nutrients are loaded in the oil gel to prepare different types of the two-phase gel nutrient delivery systems simultaneously loading the hydrophilic and hydrophobic natural antioxidants so as to effectively improve the steady-state protection effect and the bioavailability of the nutrients.

The invention discloses an anti-adhesion membrane loaded with nintedanib and a preparation method of the anti-adhesion membrane loaded with the nintedanib. The anti-adhesion membrane loaded with the nintedanib is prepared from a drug-loading substrate material and the nintedanib through electrostatic spinning, the material of the drug-loading substrate is one or more of polylactic acid, poly (p-dioxanone), a polylactic acid-glycolic acid copolymer, polycaprolactone and polyethylene glycol; a solvent adopted in the electrostatic spinning is hexafluoroisopropanol, and the voltage adopted in the electrostatic spinning is 10-14 kV. The nintedanib-loaded anti-adhesion membrane has the advantages that the tensile strength and the elongation at break are obviously improved, the mechanical property is obviously improved, the fiber distribution is uniform, the obvious anti-adhesion effect is realized, the nintedanib-loaded anti-adhesion membrane is suitable for common laparotomy, and the application prospect is wide.

The invention provides a formaldehyde-free high-strength moisture-proof shaving board and a preparation method thereof. According to the method, the surface layer material corn straw wood shavings of the shaving board are compounded in different sizes, modified isocyanate is selected as an adhesive of the surface layer material, nano-copper particles are added as an additive, meanwhile, poplar wood shavings are used as a core layer material, and a magnesium adhesive is matched, so that the prepared shaving board is extremely low in formaldehyde release amount, high in strength and high in toughness. The static bending intensity of the shaving board in use is effectively improved, and the thickness swelling rate of water absorption is reduced, so that the formaldehyde-free high-strength moisture-proof shaving board is obtained.

The invention discloses a preparation method of a multifunctional polyvinyl composite film and application of the multifunctional polyvinyl composite film in food preservation. The preparation method comprises the following steps: firstly, preparing Ag-coated MOF through a hydrothermal method, then uniformly dispersing the Ag-coated MOF and tannic acid into a carboxymethyl chitosan solution, and carrying out crosslinking modification on the Ag-coated MOF; and coating the prepared CMCS / TA / Ag (at) MOF mixed solution on a polyethylene film treated by oxygen plasma, and drying to form a film, so as to obtain the multifunctional polyethylene-based composite film. The CMCS and the TA are adopted to perform crosslinking modification on the Ag-coated MOF, so that the stability of the Ag-coated MOF can be further improved, and the release of silver ions is reduced. Compared with a common PE preservative film, the composite film prepared on the basis has better barrier capacity and mechanical property, and has antibacterial, anti-ultraviolet and anti-oxidation effects. The multifunctional preservative film is convenient to use and low in price, and has an important application prospect in the aspect of fresh-keeping packaging of meat products.

The invention relates to the technical field of tube shell cleaning processes, in particular to a novel tube shell cleaning method. The method has the advantages that hydrochloric acid and hydrogen peroxide are proportioned in the first solution, the tube shell is placed in the solution for oxidation reaction, smudginess, oxidation parts and ceramic smudginess parts on the metal surface fall off, then hydrochloric acid is used for certain dilution, reduction reaction is carried out on the tube shell, dry printing traces and oxidation parts on the surface of the tube shell are removed, and the tube shell is obtained. Cleaning is carried out in the midway under flowing deionized water, it is ensured that residual liquid on the surface of the tube shell is cleaned away, impurities adsorbed on the surface of the tube shell are removed through ultrasonic cleaning, oxidized dirt on the surface of the tube shell can be removed in an acid pickling mode, and the tube shell can strongly react with a prepared solution of acid and hydrogen peroxide; and small burrs at some unobservable positions and observable positions of the tube shell react with the tube shell, so that the burrs are shortened or eliminated, and the lengths of the burrs which cannot be eliminated are shortened while the diameter of the tip is increased.

The invention discloses a feeding mechanism for production of shredded konjac, and relates to the technical field of konjac food processing.The feeding mechanism comprises a placing frame and a processing device and further comprises a flattening device, a rotating motor is fixedly installed on the surface of the placing frame, a roller is fixedly installed at the output end of the rotating motor, a conveying belt is arranged on the circumferential face of the roller, and the conveying belt is connected with the processing device. A roller rotationally penetrates through the surface of the containing frame, a feeding frame is fixedly installed at the top of the processing device, a belt moves to drive a rotating rod to rotate, the rotating rod rotates to drive an arc-face rod to rotate to flatten raw materials conveyed to a discharging point, and when the raw materials are conveyed to the discharging point by a conveying belt, the raw materials fall into the feeding frame under the action of the gravity of the raw materials. Raw materials enter the machining device through the feeding frame to be machined, the cambered surface rod is driven by the rotating rod to rotate, the raw materials can be effectively flattened at the discharging point, it is ensured that the raw materials are evenly distributed in the machining and transporting process, and the situation that the raw materials are stacked or excessively sparse is avoided.

The invention discloses a preparation method and application of a nano zero-valent iron-zeolite core-shell structure composite material, and relates to the technical field of nano zero-valent iron composite material preparation. A layer of zeolite core-shell structure is generated on the surface of the nano zero-valent iron to prevent iron oxide from being generated on the surface of nZVI to reduce the reaction activity, and meanwhile, the mass ratio of zeolite / zero-valent iron strongly affects gradual release of Fe < 2 + > in the nano zero-valent iron-zeolite core-shell structure composite material, so that iron core oxidation is slowed down, and the reaction activity of nZVI is improved. The release speed of electrons is also slowed down, the gradually released electrons form a long-time and stable activation effect on persulfate, and the degradation of trichlorophenol can be promoted. According to the preparation method and application of the nano zero-valent iron-zeolite core-shell structure composite material, the nano zero-valent iron-zeolite core-shell structure composite material can be obtained.

The invention relates to the technical field of polyurethane coatings, and discloses a preparation method of an antibacterial wear-resistant waterborne polyurethane coating, which comprises the following steps: taking concentrated hydrochloric acid, p-phenylenediamine, sodium nitrite, paraformaldehyde, amino-modified nano silicon dioxide and hexamethylene diisocyanate as raw materials; the preparation method comprises the following steps: taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide as a raw material, carrying out diazotization coupling reaction, substitution reaction, Mannich reaction and addition reaction to prepare modified polyisocyanate, then taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and ((2-aminoethyl) azadiyl) dimethanol as raw materials, carrying out substitution reaction to prepare DOPO-based dihydric alcohol, and carrying out reaction to prepare the DOPO-based dihydric alcohol. Finally, the modified polyisocyanate, DOPO-based dihydric alcohol and polyethylene glycol 400 are used as raw materials, an antibacterial wear-resistant polyurethane emulsion is prepared through a prepolymerization reaction and a chain extension reaction, and the prepared polyurethane coating has good antibacterial, anti-ultraviolet, flame-retardant and wear-resistant properties.

The invention belongs to the technical field of fruit and vegetable preservation, and provides a preparation method of a silver nanoparticle / titanium dioxide / polydopamine modified montmorillonite antibacterial agent and application of the antibacterial agent in a copolyester / poly (butylene adipate-succinate)-terephthalate degradable film. The preparation method comprises the following steps: firstly preparing montmorillonite modified by polydopamine, and then mixing the montmorillonite modified by polydopamine with AgNO3 / TiO2 composite sol to prepare the antibacterial agent AgNPs / TiO2 / PMMT. The preparation method comprises the following steps: preparing an antibacterial agent, blending the antibacterial agent with PBTF and PBAT to prepare the antibacterial degradable composite air-conditioning film, and the composite air-conditioning film has antibacterial performance, excellent mechanical performance and air-conditioning performance, and can be applied to fruit and vegetable preservation.

The invention relates to a flame-retardant cellulose composite film and a preparation method thereof, belongs to the field of flame-retardant materials, and aims to solve the problems that a cellulose film is inflammable, poor in compatibility with an inorganic flame retardant, relatively low in mechanical property and the like. The main components of the composite membrane comprise nanocellulose, titanate nanofibers, carbon dots and a cross-linking agent. The preparation method comprises the following steps: firstly, enabling the carbon dots to react with the nanocellulose under the action of an initiator; secondly, adding titanate nanofibers into the carbon dot modified nanocellulose suspension, and uniformly mixing; then, adding a cross-linking agent and uniformly dispersing to obtain a mixed solution; and finally, casting the solution into a culture dish, and curing in a vacuum drying oven to prepare the flame-retardant cellulose composite film. According to the preparation method, the compatibility of the flame retardant and the nano cellulose is remarkably improved, the mechanical property is enhanced, and the composite film has excellent flame retardance, smoke suppression and heat insulation characteristics and is suitable for preparing the flame-retardant cellulose composite film.

The invention relates to the technical field of adhesives, and discloses a preparation method and application of a modified urea-formaldehyde resin adhesive. The invention adopts an "alkali-acid-alkali" synthesis process, and adds a cyclic heterocyclic polyphenol flame retardant in the early stage of the reaction of formaldehyde and urea to participate in the synthesis reaction of synthesizing urea-formaldehyde resin. The phenolic hydroxyl group in the flame retardant structure can react with formaldehyde, thereby reducing the free formaldehyde content in the molecule; the structure contains phosphorus and nitrogen synergistic flame retardant elements, which can promote the endothermic dehydration carbonization reaction of hydroxyl-containing compounds and play a positive role in inhibiting the combustion-supporting factors of charcoal materials; the epoxy group of epoxidized lignin can undergo a cross-linking reaction with urea-formaldehyde resin, thereby promoting the reaction of lignin and formaldehyde and reducing the formaldehyde release of plywood; the urea-formaldehyde resin adhesive has low free formaldehyde content and short curing time, and the plywood prepared by using the adhesive has low formaldehyde release, good flame retardant performance and high bonding strength.

The invention provides a capsule used as an aerosol generating substrate, the capsule contains fuming materials propylene glycol and glycerol, a capsule skin comprises a colloidal substance, the colloidal substance is at least one of animal glue, vegetable glue, starch and a starch modifier, and only one layer of capsule skin is provided. The invention also discloses an aerosol generating product using the capsule, and uniform and sufficient smoke release can be obtained at a lower heating temperature, so that the aerosol product can further reduce the energy consumption, reduce the release of harmful substances and improve the feeling of a smoker.

The invention discloses a polyimide hot-melt prepreg, a composite material and a preparation method of the polyimide hot-melt prepreg and the composite material, and belongs to the technical field of composite materials. The preparation method comprises the following steps: preparing a polyimide resin solution for impregnating fibers and self-adhering a surface layer from polyimide, a single solvent and a mixed solvent; preparing semi-solid polyimide prepreg for fiber impregnation and surface layer self-adhesion based on the two polyimide resin solutions, and then preparing an adhesive film and sequentially compounding with fiber cloth to obtain a fiber prepreg; and preparing the polyimide hot-melt prepreg based on the fiber prepreg. According to the preparation method disclosed by the invention, the reinforced fibers are fully infiltrated, and then the toughened and tackified resin layer is compounded on the surfaces of the impregnated reinforced fibers, so that the polyimide hot-melt prepreg with controllable resin content and good paving adhesiveness is obtained, and therefore, the low-porosity high-quality fiber reinforced composite material is prepared, the control difficulty of a forming process is greatly reduced, and the production efficiency is improved. The production efficiency is improved.