1174 results about "Modified starch" patented technology

The invention relates to the field of membrane materials, and discloses an epoxy modified starch-based degradable membrane and a preparation method thereof, the epoxy modified starch-based degradable membrane comprises epoxidized starch, modified nanocellulose and a plasticizer; the modified nano cellulose is prepared by mixing a modified composite filler, a nano cellulose dispersion liquid and a zinc acetate dihydrate aqueous solution; the nano-cellulose dispersion liquid is prepared by adhering polytannic acid formed by oxidation and self-polymerization of tannic acid to the surface of nano-cellulose; the modified composite filler is prepared by performing carboxylation modification on nano titanium dioxide coated fumed silica nanoparticles by using succinic anhydride and gamma-aminopropyltriethoxysilane, then reacting with polyethyleneimine to obtain an aminated composite filler, and finally grafting glycidyl dodecyl dimethyl ammonium chloride to the surface of the aminated composite filler. The prepared film material is high in tensile strength, has certain hydrophobicity, and has good heat resistance, antibacterial property and flame retardant property.

The invention discloses a pure bio-based PHA aqueous dispersion as well as a preparation method and application thereof, and belongs to the technical field of pure bio-based polymer aqueous dispersion. According to the dispersion, polyhydroxyalkanoate is used as a unique film forming matter, Pickering solid particles and a natural surfactant are adopted for synergistic stabilization, and a bio-based plasticizer can be selected. The emulsion or slurry with the polyhydroxyalkanoate content of 40-85wt% and the particle size of 0.2-3m is prepared through a melting high-pressure homogenization method, a low-temperature wet grinding method or a solvent replacement method. The coating does not contain petrochemical polymer protective colloid and perfluorinated and polyfluoroalkyl substances, and the bio-based content is greater than or equal to 99%. Due to the excellent stability, rheological property and film-forming property of the modified starch, the modified starch becomes an ideal basic material for constructing a multi-layer programmable controlled release and degradation functional coating system, can be used in the fields of paper-based barrier coatings, adhesives, advanced crop seed coats and the like, realizes excellent barrier, bonding and controlled release properties, meets the industrial compost and repulping property standards, and has wide application prospects. The method has green, environment-friendly and industrial potential.

The invention discloses a large-size green packaging carton and a preparation process thereof, and relates to the field of packaging box preparation. The environment-friendly composite material comprises the following raw materials in parts by weight: 50-80 parts of plant fiber slurry, 10-25 parts of a modified starch-based adhesive, 5-15 parts of a nanoscale inorganic reinforcing filler, 1-5 parts of a degradable water repellent agent, 0.5-3 parts of a cross-linking agent and 2-8 parts of starch and plant fiber composite buffer microspheres. According to the preparation method, full-environment-friendly raw materials such as plant fiber slurry and a modified starch-based adhesive are selected and matched with starch and plant fiber composite buffer microspheres, and optimized processes such as segmented temperature control pressurization molding, adhesive gelatinization treatment, stirring speed reduction and microsphere structure protection are combined; and through coating of the degradable polymer coating and micron-sized hydrophobic texture imprinting, synergistic improvement of high compressive strength, excellent buffering performance, excellent hydrophobic and damp-proof effects and high degradation rate of the carton is achieved.

The invention discloses a novel modified starch-based polycarboxylate superplasticizer and a preparation method thereof, and belongs to the technical field of concrete admixtures. The preparation process comprises the following steps: (1) performing acidolysis treatment on starch to obtain acidolysis starch; (2) modifying the acidolysis starch and a double-bond modifier under the action of auxiliaries such as a polymerization inhibitor to prepare novel double-bond-containing modified starch (AS); (3) mixing AS and a polyether macromonomer in water to form a base solution; (4) dropwise adding an acrylic monomer and a chain transfer agent into the base solution, and carrying out a copolymerization reaction through an initiation system; and (5) insulating and neutralizing to obtain a finished product. In order to solve the problems of non-renewable petroleum-based raw materials, high production cost and the like of the traditional polycarboxylate superplasticizer (PCA), active double bonds are introduced into modified starch by a solvent-free semi-dry process to replace part of polyether macromonomers, so that the polymerization activity and grafting ratio of the modified starch are effectively improved, the water-reducing dispersion effect of the modified starch is enhanced, and the water-reducing property of the modified starch is improved. The water reducer has the advantages of low mixing amount, high water reduction and the like, and has economic and environmental benefits.

The invention relates to the technical field of mineral processing data processing, in particular to a preparation method of a high-calcium fluorite and barite paragenic ore combined inhibitor, which comprises the following steps: collecting multi-source process mineralogy data output by an X-ray fluorescence spectrometer, an automatic mineral analyzer and the like, converting the multi-source process mineralogy data into a structured format, and constructing a process mineralogy database; based on historical data of a database, a random forest algorithm is adopted to train a correlation model, the correlation rule of mineral characteristics such as calcite content, fluorite particle size distribution and barite monomer dissociation degree and the inhibitor ratio is learned, and parameters of the optimization model are fed back through a flotation test. The combined inhibitor solves the problem of selective separation caused by similar surface properties through a synergistic effect of covering active sites of fluorite calcium by modified water glass, regulating active sites of barite barium by citric acid and assisting in enhancing inhibition by modified starch, and solves the problem of low efficiency of multi-source data integration through structured data processing and model closed-loop optimization; the flotation separation efficiency and the concentrate grade are improved.

The invention relates to a whitening and freckle-removing composition containing a composite plant extract and a preparation method of the whitening and freckle-removing composition, and belongs to the technical field of cosmetics. The composition disclosed by the invention is prepared from the following raw materials in parts by weight: 5 to 8 parts of pineapple leaf nano cellulose, 10 to 16 parts of modified starch, 10 to 15 parts of longan seed extract, 6 to 10 parts of mulberry bark extract, 5 to 8 parts of nicotinamide and 8 to 10 parts of hyaluronic acid. The pineapple leaf nanocellulose contains flavonoid and phenolic compounds with double-bond, conjugated double-bond and triple-bond structures, and modified starch is used as a filler to form a film on the surface of skin, so that an anti-ultraviolet protection wall is formed; the betaine-malate ionic liquid is added into the longan seeds, so that extraction of polyphenol in the longan seeds is improved, the longan seeds have acid-base buffering capacity, an auxiliary does not need to be added to adjust the pH value, the components of the prepared composition interact, and the whitening and freckle removing effects are achieved from multiple aspects of ultraviolet resistance, oxidation resistance, inflammation resistance and skin metabolism improvement.

The invention relates to the field of plastic bags, and discloses a biodegradable plastic bag and a preparation method thereof, the biodegradable plastic bag comprises polylactic acid, poly (butylene adipate-co-terephthalate), a functional additive, modified starch, a lubricant and an antioxidant; the functional additive is prepared by grafting hydroxylated modified castor oil and isocyanated montmorillonite loaded titanium dioxide; the hydroxylation modified castor oil is prepared by modifying castor oil with chloroethyl isocyanate, then reacting with N-allylimidazole, and then reacting with 6-mercaptohexyl-1-alcohol; the isocyanated montmorillonite loaded titanium dioxide is prepared by reacting montmorillonite loaded titanium dioxide obtained by a sol-gel method with isophorone diisocyanate; the modified starch is prepared by reacting octadecanoyl chloride and acryloyl chloride with starch, then carrying out graft copolymerization with ethyl acrylate and further introducing glycidyl methacrylate, so that the plastic bag is endowed with excellent mechanical properties, biodegradability and antibacterial property.

Aspects of the present disclosure include a rigid paperboard product comprising at least one modified starch and at least one crosslinker, wherein the at least one modified starch is present in an amount ranging from 2% to 20% by weight of the paperboard product, wherein the at least one crosslinker is present in an amount ranging from 0.5% to 8% by weight based on the dry weight of the starch content in the paperboard product, and wherein the paperboard product has a rigidity value ranging from 375 to 500.

The invention discloses a cement-based material mixing state intelligent regulation and control auxiliary agent and a preparation method and application thereof. The auxiliary agent is composed of reversible sulfonation modified degradable starch and acrylic resin containing hydroxyl. The method is characterized in that the sulfonated modified starch plays roles in dispersing and suspending cement particles and gravels and improving uniformity and flowability in the cement-based material mixing and injection molding stages, and the sulfonated starch is stimulated to be reversibly reduced into dialdehyde starch in a cement paste alkaline environment in the curing and curing stage; the molecules are mutually crosslinked to form a three-dimensional network structure, so that the effects of dispersing, suspending, adhering and fixing cement particles and gravels are achieved. Therefore, the prepared cement-based material mixing state intelligent regulation and control auxiliary agent has the intelligent effects of presenting different molecular structures and playing different roles in the stirring, injection molding and curing states, the preparation method is unique, the materials are easy to obtain, the application effect is remarkable, and the good application prospect is achieved.

The invention discloses a composite film based on light-biological synergistic gradient degradation and a preparation method thereof, the composite film sequentially comprises a light response layer, a transition layer and a biological response layer from outside to inside, and the light response layer comprises a polycaprolactone matrix, a tetraphenylporphyrin iron photosensitizer and anatase type TiO2 nanorods; the transition layer is a gradient blend of polylactic acid and modified starch; the biological response layer comprises polyhydroxyalkanoate and bacterial cellulose nanofibers; through the design of the three-layer gradient structure and the construction of the bionic microchannel, the synergistic effect of light degradation, hydrolysis and biodegradation is realized; the composite membrane has excellent mechanical properties and environmental adaptability, the degradation period can be accurately regulated and controlled within 30-180 days, and the soil degradation rate within 60 days reaches 91% or above; the preparation method comprises the processes of electrostatic spinning, gradient co-extrusion and bacterial cellulose in-situ culture. The material can be widely applied to the fields of agricultural mulching films, food packaging and the like, and the problems that a traditional degradable film is poor in mechanical property and uncontrollable in degradation are solved.

The invention discloses fruity sauce containing probiotic blasting beads and a preparation method of the fruity sauce, and relates to the technical field of jam processing. The strawberry ice cream comprises the following raw materials in parts by mass: 25 to 30 parts of diced strawberries, 15 to 18 parts of nata de coco, 28 to 33.6 parts of white granulated sugar, 9 to 10.8 parts of deionized water, 0.1 to 0.3 part of citric acid, 0.1 to 0.12 part of konjaku flour, 0.2 to 0.24 part of calcium lactate, 0.1 to 0.12 part of sodium carboxymethyl cellulose, 2.5 to 0.3 part of modified starch and 20 to 24 parts of probiotic blasting beads. Due to the addition of the probiotic blasting beads, the intestinal flora regulating and immunity enhancing capabilities of the fruity sauce are effectively improved; due to the introduction of the modified starch, the blast bead breakage-proof capability and the storage stability of the fruity sauce are improved. Therefore, the method has a wider application prospect.

The invention provides a soil conditioner for improving soil hardening and a preparation method thereof, and relates to the technical field of soil conditioning. The soil conditioner is prepared by combining nano silicon dioxide, a straw retting material, a straw composite fermentation material, biochar, a water-retaining agent and modified starch. The straw composite fermented material is prepared by the following steps: crushing straws, mixing with sweet water, stirring, drying, carrying out microwave treatment, mixing with bacillus thuringiensis, fermenting, sterilizing, subsequently adding a composite microbial agent of bacillus subtilis, trichoderma and bacillus mucilaginosus, continuously fermenting, and drying. The modified starch is prepared by semi-gelatinizing corn starch and then carrying out microwave drying and shaping. According to the present invention, the defects in the prior art are overcome, the soil hardening phenomenon can be rapidly improved with the small addition amount, the soil porosity is increased, the activity and the diversity of the soil microorganisms are ensured, and the soil fertility is improved.

The invention provides a bio-based composite liquid mulching film and a preparation method thereof. The bio-based composite liquid mulching film comprises a nanocellulose solution, modified starch, modified chitosan, glycerol and calcium carbonate, the modified starch is obtained by modifying starch with citric acid; the modified chitosan is obtained by grafting and copolymerizing chitosan with an acrylic monomer. According to the invention, a plurality of bio-based components such as modified starch, modified chitosan, a nanocellulose solution, glycerol and calcium carbonate are integrated, and natural characteristics of bio-based materials are utilized to form a uniform and degradable film layer; the soil moisture retention film can better isolate air and moisture loss, improves the soil moisture retention ability, ensures sufficient strength and flexibility in the application process, and avoids the problems of early cracking or deformation and the like.

The invention discloses a preparation method of an esterified modified starch derived hard carbon negative electrode material and application of the esterified modified starch derived hard carbon negative electrode material in a sodium-ion battery, and belongs to the technical field of sodium-ion battery negative electrodes. The preparation method comprises the following steps: firstly, carrying out one-step hydrothermal pretreatment on cheap cross-linked-esterified composite modified starch, and then carrying out one-step high-temperature carbonization to obtain the spherical hard carbon negative electrode material. And the compact stacking density formed by the spherical morphology is beneficial to shortening the diffusion path of ions and electrons. The acetyl group replaces part of hydroxyl groups in starch molecules, so that the content of amylose is reduced, the structural stability of the starch is enhanced, and the sodium storage performance is improved. In addition, the hard carbon negative pole piece is subjected to sodium pre-treatment through a liquid-phase sodium pre-treatment technology, so that the first efficiency of the battery is improved, and the long-cycle stability is promoted. The preparation process has the advantages of simple steps, simple equipment, good repeatability, no need of large-scale subsequent treatment, and suitableness for large-scale production.

The invention discloses an environment-friendly composite tree wound healing agent and a preparation method and application thereof, and belongs to the technical field of garden maintenance, the environment-friendly composite tree wound healing agent comprises the following raw materials by weight: 40-70 parts of a film forming substrate, 10-20 parts of an active component, and 10-20 parts of a functional auxiliary agent; the film-forming substrate is prepared from the following raw materials in parts by weight: 10 to 20 parts of chitosan, 20 to 30 parts of modified starch and 10 to 20 parts of vegetable wax; the active component is prepared from the following raw materials in parts by weight: 0.1 to 0.5 part of indolebutyric acid, 5 to 10 parts of tea tree essential oil, 3 to 5 parts of radix scutellariae extract, 1 to 2 parts of zinc sulfate and 0.5 to 1 part of boric acid; the functional additive comprises the following raw materials in parts by weight: 2-5 parts of nano titanium dioxide, 3-5 parts of a thickening agent and 5-10 parts of a humectant; the positive effect is achieved on tree wound healing.

The present invention discloses a livestock and poultry manure biochar-based fertilizer, comprising the following raw materials in parts by weight: 10-42% of dilute protein solution and collagenase-modified livestock and poultry manure biochar, 20-40% of urea, 7-25% of diammonium phosphate, 7-24% of potassium chloride or potassium sulfate, 0.5-1% of modified starch, and 6-23% of bentonite. The livestock and poultry manure is selected from one of chicken manure, cow manure, and pig manure. After the biochar is modified with collagenase, the surface of the biochar has more phenolic hydroxyl groups, carboxyl groups, aldehyde groups, and hydroxyl functional groups, which are effective for NH4 + , PO4 3‑ , K + , has a stronger adsorption effect, collagenase modification makes the protein distribution more uniform, and the generated groups form a stable chemical bond with the biochar surface: it improves the dispersibility of the modified biochar in aqueous solution and reduces agglomeration; it has better chemical stability in acidic and alkaline environments.

The invention discloses a preparation method of high-viscosity cationic starch, which belongs to the technical field of modified starch, and comprises the following steps: crosslinking epichlorohydrin, ball-milling and cationizing; the epoxy chloropropane crosslinking comprises the following steps: mixing starch, calcium hydroxide and deionized water, stirring at 40-50 DEG C, adding sodium stearoyl lactylate, stirring at 50-55 DEG C, naturally cooling to room temperature, adding sodium chloride and epoxy chloropropane, stirring, dropwise adding a potassium hydroxide aqueous solution, stirring, adjusting the pH value to 6, filtering, taking filter residues, washing and drying to obtain crosslinked starch; in the step of ball milling, calcium hydroxide, sucrose fatty acid ester SE-11 and deionized water are mixed and then subjected to ball milling, and a ball-milled material is obtained; the prepared high-viscosity cationic starch is high in paste liquid viscosity and cationic substitution degree, good in paste liquid viscosity stability, uniform in substitution degree and paste liquid viscosity, high in reaction efficiency in cationization and low in alkali consumption.

The present invention provides a solid or semi-solid flavour delivery system, comprising:30-60 wt. % water;10-40 wt. % fat;8-40 wt. % of a starch component selected from starch, modified starch and combinations thereof; andflavouring;wherein the flavour delivery system comprises, calculated by weight of the flavour delivery system, 0.1-20 mg / kg 2,4-heptadienal and 1-200 mg / kg 2,4-decadienal.This flavour delivery system can be applied in foodstuffs such as meat analogues, processed meat and extruded products to provide a nice juicy, fatty flavour during consumption of the foodstuff.

The invention relates to the technical field of electronic-grade glass fibers, in particular to a sizing agent for electronic-grade glass fiber superfine yarns and a preparation method of the sizing agent. Comprising the following raw materials in percentage by mass: 8-15% of polyvinyl alcohol, 2-6% of polyvinyl ester, 4-10% of polyethylene glycol, 3-9% of a lubricant, 3-7% of urea, 10-15% of modified starch and the balance of pure water. According to the sizing agent provided by the invention, a novel environment-friendly sizing agent formula is researched and developed according to the characteristics of superfine electronic-grade glass fiber yarns, so that warp yarns have softness, surface smoothness, antistatic property and saturability among single fibers, toughness and bundling property are improved, hairiness and broken silk are reduced, and warp-wise strength and wear resistance are enhanced; meanwhile, the harmful influence on the environment is also reduced.

The invention relates to the technical field of fertilizers, in particular to a urea-containing slow-release coated fertilizer and a preparation method thereof. The urea-containing slow-release coated fertilizer comprises urea particles and a bio-enzyme polyurethane coating layer coated on the surfaces of the urea particles, and the bio-enzyme polyurethane coating layer comprises the following components in parts by mass: 10-20 parts of urea particles, 10-20 parts of urea particles and 10-20 parts of urea particles. Comprising the following raw materials: 20 to 25 parts of castor oil, 18 to 25 parts of castor oil-based polyester polyol, 25 to 30 parts of hydrophobic modified starch, 16 to 22 parts of diphenylmethane diisocyanate, 0.03 to 0.05 part of a catalyst, 1.5 to 2 parts of a dispersant, 1.5 to 2 parts of a high-temperature-resistant bio-enzyme, 2 to 3 parts of glycerin and 14 to 18 parts of N, N-dimethylformamide. The polyurethane coating layer material of the bio-enzyme is prepared through the cross-linked network design of the molecular level and the collaborative regulation and control of the macroscopic coating layer thickness, the balance among efficient nitrogen utilization, environmental friendliness, mechanical properties and weather resistance is achieved, and a solution with technical innovation and practical value is provided for the field of slow-release fertilizers.

The application discloses a salt-tolerant modified cationic starch-based flocculant and a preparation method and application of the flocculant in flocculation and recovery of microalgae, and belongs to the technical field of flocculation materials. The preparation method comprises the following steps: (1) mixing and stirring an alkali solution and starch, then adding a modifier solution of dodecyl succinic anhydride (DDSA), mixing and reacting, and finally washing and drying to obtain modified starch; and (2) mixing and stirring an alkali solution and the modified starch obtained in the step (1), then adding glycidyltrimethylammonium chloride (GTA), mixing and reacting, and finally washing and drying to obtain the product. The starch is modified by GTA and DDSA to be cationic and hydrophobic, and a salt-tolerant modified cationic starch-based flocculant is successfully prepared. The flocculant has good salt tolerance in microalgae flocculation and recovery, and can still achieve a recovery rate of more than 80% under high salinity, and the flocculant has excellent economic value.

The invention relates to the technical field of adhesives, in particular to a starch adhesive for artificial boards and a preparation method of the starch adhesive, and the starch adhesive comprises the following components in parts by weight: 100 parts of modified konjac starch, 15-25 parts of polyvinyl alcohol, 8-12 parts of polyacrylate, 0.1-0.3 part of a preservative, 3-6 parts of epoxy chloropropane, 0.5-1.0 part of a viscosity stabilizer, 2-4 parts of a modified rare earth compound and 180-220 parts of water. According to the invention, a composite adhesive system of'modified starch matrix + chemical cross-linked network + rare earth coordination interface 'is constructed, so that the water resistance and the bonding strength can be obviously improved; meanwhile, the formaldehyde emission is zero, the problem of formaldehyde pollution of urea-formaldehyde resin, phenolic resin and other traditional adhesives is avoided, and an adhesive solution with high performance and environment-friendly characteristics is provided for the artificial board industry.

The invention discloses a modified starch fiber-based degradable plastic and a preparation method thereof, and belongs to the technical field of bioplastics, citric acid is adopted to improve the interaction between starch and epoxidized soybean oil, borax is used as a cross-linking agent to further improve the compatibility between the starch and citric acid-epoxidized soybean oil oligomer, and the modified starch fiber-based degradable plastic is prepared. The modified starch fiber-based degradable plastic is obtained, finally, the degradable plastic film is prepared through a hot press molding method, the degradable plastic film has good tensile strength, elongation at break and degradation capacity, borax serves as a cross-linking agent and can be complexed with hydroxyl of starch to form a ligand, and a multi-core complex of a net structure is formed. The borax can also form a coordinate bond with hydroxyl or carboxyl of citric acid or generate a polymerization reaction, so that the compatibility of the starch and the citric acid-epoxidized soybean oil oligomer is further improved.

The invention relates to the technical field of materials, in particular to a fiber-reinforced starch-based fireproof and moisture-proof composite material and a preparation process thereof. Comprising the following steps: toughening and fireproof modification of lignin fibers; carrying out site selection phosphorylation on the starch; and carrying out in-situ bonding of phenylboronic acid and hydrophobic modification of the blended material. The preparation method comprises the following steps: preparing a pre-assembled solution from ellagic acid, tannic acid and tetrabutylammonium bromide, then adding ZrOCl2 powder in batches to form a continuous ceramic phase ZrO6, forming an interlocking structure with a carbon layer to enhance the flame retardant property, then adding lignin fibers in the last batch, adjusting the pH value, and condensing to generate Zr-O-C covalent bonds, so as to obtain the composite material. The prepared modified lignin fiber is subsequently blended with site-selected phosphorylated starch, so that the mechanical property of the modified lignin fiber is enhanced, and heat and mass transfer between a gas phase and a condensed phase can be hindered when the temperature is too high, thereby greatly improving the flame retardant property of the composite material.

The invention relates to the technical field of adhesives, and particularly discloses a low-formaldehyde environment-friendly adhesive and a preparation method thereof. The invention relates to a low-formaldehyde environment-friendly adhesive which is prepared from the following raw materials in parts by mass: 30-50 parts of modified starch, 15-25 parts of vegetable protein, 5-10 parts of modified nano cellulose, 2-5 parts of a composite cross-linking agent and 80-150 parts of water, the composite cross-linking agent comprises amino silane and polyaspartic acid; the modified starch is prepared by performing graft copolymerization on starch subjected to enzymolysis by alpha-amylase and composite anhydride; the vegetable protein is subjected to alkalization and heat treatment before being used; the modified nano-crystalline cellulose is prepared by performing ring-opening etherification reaction on nano-crystalline cellulose, epoxypropane and ethylene oxide in sequence. The low-formaldehyde environment-friendly adhesive prepared by the invention has relatively good bonding strength and relatively low formaldehyde emission.

The invention provides an amino acid compound fertilizer for improving nitrogen and phosphorus utilization rate and a preparation method. The compound fertilizer is based on urea, ammonium sulfate, monoammonium phosphate and potassium chloride according to a specific proportion, glutamic acid / glycine compound amino acid and iron, zinc and boron trace elements are added, and the 18-12-18 proportioning fertilizer with a slow release function is formed through the synergistic effect of amino acid chelation pretreatment and a high tower granulation process. Amino acid competitive inhibition phosphorus immobilization and activation of crop nitrogen metabolic pathways are utilized, a porous coating structure is constructed by means of a modified starch binder, the technical effects that the nitrogen utilization rate is increased by 4% or above and the phosphorus utilization rate is increased by 6% or above are achieved, and the bottleneck of nutrient waste of traditional balanced fertilizers is broken through.

The invention relates to the technical field of adhesives, and discloses a preparation method of a water-resistant plant starch formaldehyde-free adhesive, plant-based starch reacts with a DOPO flame retardant and hydrogen-containing silicone oil to obtain DOPO-silicone oil modified starch, and then the DOPO-silicone oil modified starch is added into a polyurethane emulsion to obtain the water-resistant plant starch formaldehyde-free adhesive. DOPO, a nitrogen-containing benzeneimide ring and a polysiloxane structure are introduced into a starch molecular chain, starch is used as a carbon source to form a nitrogen-phosphorus intumescent flame retardant, phosphoric acid substances, nitrogen and other non-combustible gases generated during combustion are in rapid contact with the starch, dehydration is performed to form an intumescent foam carbon layer, grafted polysiloxane is pyrolyzed to generate an inorganic silicon oxide, and the intumescent foam carbon layer is formed. The flame-retardant polyurethane adhesive has the advantages that the flame-retardant polyurethane adhesive has good flame retardancy and water resistance, and is quickly attached to an expanded foam carbon layer to form a compact and stable silicon-containing carbonized layer, so that heat transfer is effectively inhibited, and oxygen is prevented from being in contact with a polyurethane adhesive matrix, so that the flame-retardant polyurethane adhesive has good flame retardancy and water resistance.

The invention discloses a high-load starch-based steady-state morinda citrifolia enzyme spray-dried microcapsule and a preparation method thereof, belongs to the technical field of food spray drying, and provides the high-load starch-based steady-state morinda citrifolia enzyme spray-dried microcapsule which comprises morinda citrifolia enzyme and modified starch N-zorbit M / porous starch. The preparation method comprises the following steps: stirring and mixing the morinda citrifolia enzyme and the wall material according to different proportions to obtain a morinda citrifolia enzyme and wall material mixed solution; and carrying out spray drying on the morinda citrifolia enzyme mixed solution to obtain the high-load starch-based morinda citrifolia enzyme spray-dried microcapsule. Modified starch N-zorbit M / porous starch is used as a wall material to prepare the high-load morinda citrifolia enzyme spray-dried microcapsule, so that the volatile unpleasant odor of morinda citrifolia enzyme is reduced, and the total phenol content and the oxidation resistance of the morinda citrifolia enzyme are improved.

The invention provides a printing and dyeing wastewater concentration method and system, and the method comprises the steps: carrying out pretreatment on desizing wastewater, so that suspended particles and colloidal impurities in the wastewater are intercepted and adsorbed by a filtering medium; carrying out buffering and flow regulation on the pretreated wastewater, and meanwhile, carrying out heat exchange on hot condensate water generated in the printing and dyeing production process and the pretreated wastewater; raising the temperature of the wastewater to 40 DEG C or above; pressurizing the heated wastewater and then carrying out membrane separation and concentration treatment, forming dialysate by micromolecular substances and part of water, and gradually accumulating intercepted macromolecular substances to form concentrated solution; when the concentration of the concentrated solution reaches the discharge standard, pollutants are treated by adopting a chemical precipitation method and a biological treatment method, or useful substances are recycled. The wastewater concentration process flow is optimized, the wastewater is filtered, intercepted and adsorbed through multiple media, a good water inlet condition is provided for concentration treatment, modified starch and PVA in the wastewater are effectively concentrated, and the follow-up treatment volume and difficulty are reduced.

The invention belongs to the field of composite materials, and discloses a degradable composite film material and a preparation method thereof.The preparation method comprises the steps that under the inert atmosphere, starch is modified through ultraviolet radiation and then mixed with a complexing plasticizer to obtain a mixture, then a silane activation solution is added, and heating and stirring are conducted to obtain a modified starch solution; in an inert atmosphere, melting the modified starch solution and a polymer at 150-180 DEG C in different temperature zones, adding a nano filler, and mixing to obtain a compound; and adding the compound into a film blowing machine to obtain a composite film, and carrying out heat treatment on the composite film to obtain the degradable composite film material. According to the method, the mechanical property and hydrophobicity of the degradable composite film are improved.