1628 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 water-based ink, in particular to bio-based polyurethane water-based ink and a preparation process thereof. The preparation method specifically comprises the following steps: S1, adopting ring-opening epoxidized soybean oil and modified epoxidized soybean oil as chain extenders, and carrying out chain extension reaction on the chain extenders and a polyurethane prepolymer to prepare waterborne polyurethane; s2, performing viscosity reduction treatment on starch, then grafting with 3-amino-5 carboxyl-N-methyl benzamide, and finally mixing with ring-opening epoxidized soybean oil for modification to prepare modified starch; s3, mixing the waterborne polyurethane, the modified starch, the waterborne pigment, the thickening agent, the flatting agent, the defoaming agent and the deionized water according to the proportion, emulsifying and defoaming to obtain the bio-based polyurethane waterborne ink. The bio-based polyurethane water-based ink has excellent thermal stability, adhesive capacity and printing quality, is green and environment-friendly, and shows remarkable practicability.

The invention belongs to the technical field of concrete, and particularly relates to a concrete hydration temperature rise inhibitor and a preparation method and application thereof. The concrete hydration temperature rise inhibitor is of a core-shell structure composed of an inner core and a shell layer. Wherein the core comprises a porous material and a hydration temperature rise inhibition material loaded on the porous material, and the hydration temperature rise inhibition material comprises 2-phosphonobutane-1, 2, 4-tricarboxylic acid, modified starch, 1-hydroxyethylidene-1, 1-diphosphonic acid, sodium polyacrylate and cellulose ether. The concrete hydration temperature rise inhibitor has an efficient hydration heat inhibition effect, the proportion of a hydration temperature rise inhibition material in the inhibitor is large, meanwhile, an exothermic temperature peak can be accurately inhibited, and no negative influence is caused to a hydration induction period.

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 belongs to the technical field of materials, and discloses mildew-proof modified starch-based super absorbent resin as well as a preparation method and application thereof. The mildew-proof modified starch-based super absorbent resin is prepared from the following raw materials in parts by mass: 10 to 20 parts of modified carboxymethyl starch, 2 to 3 parts of quaternized carboxymethyl chitosan, 10 to 15 parts of 2-acrylamido-2-methylpropanesulfonic acid, 15 to 25 parts of acrylamide, 100 parts of acrylic acid, 0.4 to 0.7 part of a redox initiator and 0.05 to 0.15 part of a cross-linking agent. According to the invention, the inherent defects of low mechanical strength, poor salt tolerance, poor stability, easy decomposition, short service life and the like of the starch-based resin are obviously improved, so that the starch-based super absorbent resin with good mildew resistance and more excellent performance can be developed.

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 technical field of starch processing, in particular to a preparation method and application of modified starch, and the modified starch is prepared from the following raw materials in parts by mass: 15-30 parts of pre-modified starch A and 55-70 parts of pre-modified starch B; the pre-modified starch A is prepared from pretreated starch A, acetic anhydride and acetaldehyde dehydrogenase; the pretreated starch A is frozen ball-milled starch; the pre-modified starch B is prepared from pre-treated starch B and octenyl succinic anhydride; the pretreated starch B is step-by-step toughened starch; the step-by-step toughening treatment comprises the following steps: performing low-temperature sealing treatment on starch, performing short-time ultrasonic treatment, performing heating reaction, performing secondary ultrasonic treatment, performing high-temperature treatment, and performing secondary ultrasonic treatment; the pre-modified starch A and the pre-modified starch B are mixed according to a specific proportion, and the modified starch which is high in solubility and freeze-thaw stability and can be widely applied to the fields of food, papermaking, spinning and medicine is obtained.

The invention relates to digestive tract mucosa protective agent powder as well as a preparation method and application thereof, and the digestive tract mucosa protective agent powder contains gel and a cross-linking agent, the gel comprises any one or a combination of at least two of cellulose, modified cellulose, alginate, modified alginate, sodium polyglutamate, modified sodium polyglutamate, starch, modified starch, sodium hyaluronate, modified sodium hyaluronate, pectin or modified pectin, and the cross-linking agent comprises an ionic cross-linking agent or a nonionic cross-linking agent. The powder protective agent provided by the invention is convenient to produce and simple to use, can be adhered to the surface of a mucous membrane wound surface only through simple spraying operation, forms a hydrogel protective layer under the action of gastric juice, intestinal juice or other liquid on the surface of the wound surface, plays a role of a physical barrier, and has a good application prospect. The continuous erosion of digestible liquid or pathogenic microorganisms on the surface of the wound surface to the wound surface is effectively blocked.

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 belongs to the technical field of textile materials, and relates to a high-performance antibacterial flame-retardant environment-friendly textile sizing agent and a preparation method thereof. The textile size composition is prepared from the following raw materials in parts by weight: 50-80 parts of composite modified starch, 5-10 parts of (methyl) acrylic acid (methyl / butyl) ester, 5-7 parts of waterborne polyurethane, 12-20 parts of xanthan gum, 3-9 parts of a composite antibacterial agent, 10-18 parts of a composite flame retardant, 1-3 parts of sodium citrate, 2-3 parts of a smoothing agent and 40-80 parts of deionized water. The concentration of the slurry composition is controlled between 10 g / L and 35 g / L by deionized water, and the pH value is adjusted between 6 and 8. The textile sizing agent does not contain a PVA component, has the characteristics of bacteriostasis, flame retardance, environment friendliness, wear resistance, excellent sizing performance and the like, can replace the traditional PVA sizing agent, and is multifunctional, high-performance, bacteriostatic, flame-retardant and environment-friendly textile sizing agent.

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 relates to a starch type impregnating compound and a preparation method and application thereof, the impregnating compound comprises an active component and water, the active component comprises the following raw materials in parts by weight: 45-65 parts of a starch-based film-forming agent, 5-10 parts of a plasticizer, 15-20 parts of a lubricant, 1-2.5 parts of an emulsifier, 5-8 parts of a coupling agent, 1-2.5 parts of a softening agent, 0.5-1.5 parts of a preservative and 0.02-0.05 part of a defoaming agent; wherein the starch-based film-forming agent is a composition of potato oxidized hydroxypropyl starch, starch octenyl succinate and modified starch in a mass ratio of 1: (1.1-1.5): (0.5-0.8); the lubricant is a composition of carnauba wax and hydrogenated soybean oil. The impregnating compound disclosed by the invention can effectively improve the wear resistance of low-twist yarns, reduce hairiness and enhance bundling property and weaving performance, and can be used for preparing glass fiber spinning spun yarns.

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 belongs to the technical field of building materials, and particularly relates to a bentonite-starch composite thixotropic agent as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) grafting a carbon-carbon double bond on starch to obtain grafted modified starch; (2) grafting ether groups on carbon-carbon double bonds of starch to obtain modified etherified starch; (3) adsorbing a polycarboxylate superplasticizer and polyethylene glycol on the surface and between layers of bentonite to obtain modified bentonite; and (4) adding the modified etherified starch, the modified bentonite, a cross-linking agent, an initiator and a pH regulator into water, and carrying out graft copolymerization reaction to obtain the bentonite-starch composite thixotropic agent. The composite thixotropic agent has excellent thixotropic performance, stability, plasticity and cohesiveness, and overcomes the defects that bentonite has water absorption expansibility and is difficult to store, and an organic thixotropic agent is high in price and poor in stability.

The invention discloses a preparation method of a novel environment-friendly water-resistant adhesive for a thermo-sensitive paper label, and relates to the technical field of adhesive preparation. The preparation method comprises the following steps: firstly, carrying out graft copolymerization on tannic acid to generate a spinning solution, preparing micron-sized polyurethane elastic fibers, introducing a plurality of phenolic hydroxyl groups into soybean protein, forming a new compact network structure with the protein to prevent invasion of water molecules, and cooperating with microwaves to change an aggregation mode among protein molecules and improve the hydrophobicity of the soybean protein; phenolic hydroxyl is used as a hydrogen donor to resist oxidation and improve the viscosity of the adhesive; the modified starch is esterified by amino acetyl chloride, so that the compatibility is improved, the modified starch and the epoxy resin form a mutual cross-linked net structure, and the modified starch and the polyurethane elastic fibers can form a chain structure, and the mechanical bonding performance of the adhesive is improved; in addition, green and environment-friendly raw materials are adopted, so that the adhesive can be biodegraded, and novel and environment-friendly effects are achieved. The adhesive prepared by the invention has the effects of environmental protection, high viscosity and water resistance.

The present application discloses a high-temperature starch-type sizing agent for electronic-grade glass fiber yarn, which is an aqueous solution of effective ingredients, the solid content of the sizing agent is 5.19-10.76%, and the solid mass of each effective ingredient accounts for the percentage of the total solid mass of the sizing agent: starch 3.40-7.00%; oil 1.10-2.30%; emulsifier 0.05-0.10%; pretreatment agent A 0.15-0.40%, pretreatment agent B 0.30-0.50%; antistatic agent 0.17-0.40%; ammonia water 0.02-0.06%. The starch is a mixture of high-amylose corn starch, acrylamide grafted modified starch and acetyl modified starch, and the mass ratio of the three is 1:1:1-5:2:1. This wetting agent can maintain the advantages of high-temperature system wetting agents in terms of high yarn bundling and good covering properties, while reducing yarn stiffness and improving yarn lubricity, making it less likely for D450 and D900 yarns to produce loose fibers during the production process, reducing the impact of production process fluctuations on yarn quality, significantly improving yarn weaving performance, and significantly reducing fabric defects.

The invention relates to a special soil-improving disease-resistant coated controlled-release fertilizer for wheat and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a fertilizer particle core; step 2, preparing modified starch inner coating liquid; step 3, forming an inner coating film; and step 4, forming the biochar outer coating film. According to the special soil-improving disease-resistant coated controlled-release fertilizer for wheat, provided by the invention, fertilizer particles are of a multi-layer structure. The inner-layer coating is modified starch and is prepared by cross-linking a seaweed extract and starch, so that the resistance of wheat to a bad environment can be improved; the outer coating is modified biochar, so that the release rate of nutrients can be reduced, and the physicochemical properties and microenvironment of the soil can be improved.

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 provides a propolis soft capsule which comprises a soft capsule shell and a content wrapped in the soft capsule shell, and the content comprises 400-750 g of propolis extract, 2000-2400 g of vegetable oil, 1000-1400 g of modified starch, 75-100 g of tea seed oil, 50-100 g of natural antioxidant and 75-125 g of cellulose on the basis of 10000 propolis soft capsules. One of the purposes of the invention is to provide the propolis soft capsule and the production process thereof, and by optimizing the formula and the production process of the propolis soft capsule, the purposes of improving the bioavailability, enhancing the stability of the product, improving the mouth feel, improving the safety of the product and improving the environmental friendliness of the product can be achieved on the premise of not influencing the active ingredients of the propolis.

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 invention discloses a fruity yoghurt powder formula and a preparation method thereof, and relates to the technical field of food processing.The fruity yoghurt powder formula comprises milk, white granulated sugar, fruit juice, a yoghurt leavening agent, a stabilizer, a sweetening agent, an emulsifying agent, an acidity adjusting agent and water, the stabilizer is one of modified starch, gelatin, pectin and a yoghourt modifier. The stabilizer is added to improve the texture and stability of the yoghurt and reduce the problems of whey separation, texture roughness and the like, so that the formula of the fruity yoghurt powder is optimized, the taste can be ensured, the stability and quality of the yoghurt are enhanced, the layering or precipitation phenomenon of the yoghurt in the storage and transportation process is prevented, and the quality of the yoghurt is improved. Streptococcus thermophilus and lactobacillus bulgaricus in a mass ratio of 2: 1 are selected as yoghurt leavening agents, so that the fermentation process is stable, and the yoghurt is fine and smooth in texture.