40 results about "Oxidised starch" patented technology

The invention discloses an acid-neutral nano PHA paperboard reinforcing agent as well as preparation and application thereof, and belongs to the technical field of papermaking chemicals. The reinforcing agent is a bio-based nano water-based emulsion, and the core of the reinforcing agent is that a stable high-positive-charge nanoparticle interface is constructed under an acid-neutral window through the synergistic effect of polyphenol and an amine polymer. The environment-friendly wet strength agent solves the potential safety hazard of the traditional wet strength agent, and does not contain free formaldehyde and epichlorohydrin. The method has the outstanding advantages that the method is completely compatible with a modern papermaking acid-neutral process, and the defect that the similar bio-based technology needs to react under alkalinity is overcome; the adhesive is flexible to apply, can be efficiently used for wet end addition, or can be stably compounded with oxidized starch for surface sizing; the preparation method is simple, efficient and energy-saving, can realize excellent wet strength retention rate and dry strength improvement under the conditions of low addition amount and conventional industrial drying at 105 DEG C, and does not need extra high-temperature curing.

This invention relates to a healing powder prepared using starch as the main matrix and oxidized starch and diamino polyethylene glycol as modifiers.

The utility model relates to paper -making auxiliary equipment technical field discloses automatic deployment jar of oxidized starch sizing liquid, including the casing, the top fixedly connected with the ration box of casing, the top fixedly connected with the sealing cover of ration box, the inside rotatory connection has the gear of ration box, the inside of gear has a plurality of ration groove, the bottom inner wall fixedly connected with motor no.

The invention relates to the technical field of textile size, in particular to a preparation method of desizing-free modified PVA (polyvinyl alcohol) size and a process for sizing yarns by the aid of the size, and the desizing-free modified PVA size is prepared from raw materials in parts by mass as follows: 40-60 parts of modified PVA, 20-30 parts of oxidized starch, 5-10 parts of polyethylene glycol, 2-5 parts of nanoparticles and 3-8 parts of a compound aid. 100 to 150 parts of deionized water; wherein the modified PVA is prepared by carrying out grafting or copolymerization modification on PVA with the polymerization degree of 1700-1800 and the alcoholysis degree of 88% through an acrylate monomer or one of maleic anhydride and itaconic acid. Compared with the prior art, the method has the advantages that the more hydrophilic modified PVA sizing agent is prepared firstly, then the desizing-free mixed sizing agent is prepared, and the yarns do not need to be desized in subsequent dyeing or after-finishing processing after being sized in the desizing-free mixed sizing agent, so that the textile technological process can be effectively reduced, the energy consumption is reduced, the sewage discharge is reduced, the damage to the yarns and fabrics is reduced, and the production cost is reduced.

The invention relates to the crossing field of agricultural biological control and fertilizer technology, and discloses a compound microbial pesticide fertilizer capable of simultaneously controlling root-knot nematode and soil-borne fungal diseases, the pesticide fertilizer has a core-shell structure, and comprises an inner inorganic nutrition core, a middle isolation buffer layer and an outer functional bacterial layer; the raw materials comprise inorganic nutrition core particles, a biological activation organic carrier, composite functional bacterial powder and a modified slow-release binder. Wherein the binder is prepared from oxidized starch and PVA through borax crosslinking, so that the particle strength is enhanced; the carrier is fermented and activated, and synergistic components such as azadirachtin are added. An organic isolation buffer layer is constructed through a layered coating process, osmotic pressure stress of inorganic salt on microorganisms is effectively blocked, and the problem of strain inactivation is solved; the synergistic compounding of paecilomyces lilacinus, pochonia chlamydosporia, trichoderma harzianum and bacillus subtilis is utilized to realize the comprehensive prevention and control of root-knot nematode and soil-borne fungal diseases, and has the functions of nutrient slow release and crop resistance induction.

This invention belongs to the field of oil and salt reduction technology in food processing, and discloses a Pickering emulsion with dual oral pH and enzyme responses, its preparation, and its application in oil and salt reduction. The Pickering emulsion comprises an outer aqueous phase, an oil phase, and an inner aqueous phase, homogenized by high-speed shearing. The outer aqueous phase is an aqueous solution containing 0%-5% sodium chloride and 2%-5% oxidized starch-gelatin nanoparticles; the oil phase is a mixture of edible oil and polyglycerol ricinoleic acid ester; and the inner aqueous phase is a sodium chloride aqueous solution with a mass fraction of 2%-10%. The emulsion constructed by this invention can release 90%-94% of sodium ions in the oral cavity. When added to sauces, it can reduce the amount of sodium chloride added by 20% while maintaining the perception of saltiness. Furthermore, while "reducing salt without reducing saltiness," it also has good oral lubrication properties and can replace 14.7%-20% of the added oil, showing good application prospects in reducing oil in food seasoning sauces.

The present application relates to the technical field of cellulose laminated paper manufacturing, in particular to a high-strength laminated paper and a preparation process thereof. The present application overcomes the problem of poor strength of laminated paper produced by traditional process. By compounding different types of extracted fibers, optimizing the process, improving the mechanical properties, adding sisal pulp to form a nano skeleton, long fiber of coniferous wood pulp directional interweaving to improve tensile homogeneity, eucalyptus pulp short fiber filling pores and aramid grafting to enhance interface bonding, the obtained paper pulp produces base paper; combined with pre-pressing dewatering to close pores and gradient drying to regulate hydrogen bond density, supplemented by rigid-elastic roller alternate calendering to realize the synergy of surface densification and internal flexibility; using a copolymer-based laminating system, nano material and chitosan composite reinforcement layer bonding, oxidation starch compatibilization and plasticization modification synergistic promotion of compost degradation; large pore closure and surface micropore refinement precise regulation of air permeability, the laminated paper meets the air permeability requirement, while realizing more than 90% biodegradation rate.

This invention relates to the field of green materials engineering technology, and discloses a low-VOC environmentally friendly pressure-sensitive adhesive for vehicle body stickers and its preparation method. The adhesive comprises deionized water, enzymatically hydrolyzed sodium lignin sulfonate powder, hydrogenated rosin glycerol ester, oxidized starch aqueous solution, ammonia, glucono-δ-lactone powder, and zirconium carbonate ammonium solution. During preparation, a microemulsion is formed by dispersing hydrogenated rosin glycerol ester using the amphiphilic properties of lignin under a shear field. After mixing with oxidized starch, latent acid, ammonia, and a crosslinking agent are added under laminar flow conditions. This invention utilizes the physicochemical coupling mechanism of ammonia volatilization and the thermal release of acid from glucono-δ-lactone to achieve synchronous homogeneous crosslinking at a thick coating depth, solving the problem of cohesive gradient defects. Simultaneously, it utilizes high-valence zirconium ions to construct a dynamic reversible coordination dissipation network, effectively dissipating peel tensile stress, avoiding cohesive-destructive residues, and eliminating the risk of VOCs and interfacial pinholes caused by small-molecule emulsifier residues, significantly improving heat resistance and tack performance.

The application discloses a method for manufacturing plate from coconut shell fiber material, comprising pretreatment of coconut shell fiber raw material: crushing and screening waste coconut shell to obtain coconut shell fiber coarse material. The application adopts "steam explosion-alkali cooking" combined pretreatment to efficiently dissociate fibers and expose hydroxyl, significantly increasing fiber roughness, solving the problems of large fiber damage and difficult gluing in traditional process; using oxidized starch, nanocellulose and silane coupling agent to construct a "double network crosslinking" system, completely abandoning formaldehyde, and the water resistance and gluing strength are better than traditional starch glue; through "sandwich" paving structure and phytic acid modified lignin flame retardant, the unity of smooth surface, high strength core and overall flame retardation is realized, and the production cost is greatly reduced; gradient hot pressing combined with microwave assistance solves the problems of thick plate bubbling and delamination, and the solidification speed is fast; the introduction of nano aerogel and vacuum impregnated modified oil endows the plate with excellent heat preservation, heat insulation, waterproof and corrosion resistance.

The invention relates to the technical field of water-based coatings, and discloses a food-grade water-based coating with skid resistance, wear resistance and stain resistance and application of the food-grade water-based coating in a water cup, and the food-grade water-based coating comprises a coating composition and oxidized starch for curing, the coating composition comprises a solvent, a hydrophilic response component, an ion response component, a film-forming main body and a cross-linking agent, the oxidized starch is prepared by reacting starch with an oxidizing agent. According to the anti-skid coating, the components of carboxymethyl chitosan and polyaspartic acid sodium salt are cooperated, and a coating preparation process of step-by-step dissolution and stirring at a specific rotating speed is matched, so that environmental adaptability anti-skid is realized. Carboxymethyl chitosan absorbs water in a moist environment to generate conformational rearrangement and expose polar groups, polyaspartic acid sodium salt is affected by ions in an electrolyte environment to cause molecular chain curl, the friction performance of the coating in dry, moist and electrolyte environments can be adjusted according to needs through linkage of carboxymethyl chitosan and polyaspartic acid sodium salt, and meanwhile, the components are uniformly dispersed to guarantee response stability. The inherent contradiction between skid resistance and easy cleaning is solved.

The application relates to a degradable corrugated paper auxiliary and a preparation method thereof, and belongs to the technical field of packaging materials. The auxiliary comprises, in terms of weight parts, 50 parts of oxidized starch, 6-8 parts of a modified reinforcing agent, 0.5-0.7 parts of a thickening agent, 0.15-0.2 parts of a dispersing agent, 0.1-0.13 parts of an antifoaming agent, 0.02-0.03 parts of a mildew-proof agent and 90-100 parts of water; in the process of sizing and curing, the ethoxysilane of the side chain of the modified reinforcing agent is coupled and condensed with the hydroxyl of the paper fiber, the main chain of the ethoxysilane is clamped in the macromolecular chain of the starch, rivet action is generated, the binding strength between the paper fibers is increased, the paper fibers are not prone to cracking in the bending process, in addition, in the process of coupling and condensation, a fluorine-containing organic silicon water-resistant layer is uniformly introduced to the surface of the paperboard substrate, and the water-resistant stability of the paperboard is effectively improved.

This invention discloses a PVA water-soluble adhesive tape and its preparation method, relating to the field of environmentally friendly polymer materials technology, and belonging to patent classification number C09J103 / 04. The method includes the following steps: mixing oxidized starch with deionized water, adding polyamide polyamine epichlorohydrin resin, and heating to carry out an ionic crosslinking reaction to obtain ionicly crosslinked starch; cooling the ionicly crosslinked starch, then adding carboxybetaine methacrylate and ammonium persulfate, and heating to carry out a free radical grafting reaction to obtain modified starch; adding polyvinyl alcohol aqueous solution and borax decahydrate to the modified starch to carry out a borate ester crosslinking reaction to obtain a water-soluble starch-based adhesive; preparing a PVA film substrate using a blown film process, uniformly coating the water-soluble starch-based adhesive onto the PVA film substrate using a precision coating machine, and then curling and slitting to obtain the PVA water-soluble adhesive tape. The PVA water-soluble adhesive tape prepared by this invention not only has good water solubility but also excellent adhesive properties.

The invention belongs to the technical field of degradable mulching films, and relates to a biodegradable mulching film as well as a preparation method and application thereof, and the biodegradable mulching film is prepared from oxidized starch, hydroxymethyl cellulose, trehalose, polyvinyl alcohol and a plasticizer. According to the invention, natural and synthetic biological materials are compounded, so that the water resistance, thermal stability, tensile property and the like of the mulching film are improved; starch and cellulose are used as main materials, so that resource utilization of agricultural wastes is realized, and the preparation cost is reduced; after degradation, nutrient substances necessary for life activity are provided for soil microorganisms to promote reproduction, and the soil structure is improved; environmental pollution caused by the plastic mulching film is reduced, and agricultural sustainable development is facilitated; the preparation operation is simple, the whole process is normal temperature and normal pressure, liquid is converted into a solid film at normal temperature, and the safety is high.

The invention relates to the technical field of cigarette filter materials, in particular to a preparation method of high-permeability and high-strength filter stick forming paper. The method comprises the following steps: mixing and defibering special bleached jute pulp and broadleaf wood bleached pulp according to a dry weight ratio to form mixed pulp; performing low-beating-degree treatment on the mixed pulp, and controlling the beating degree; sequentially adding cationic polyacrylamide, a sodium alginate solution and a nano-fibrillated cellulose suspension into the slurry to serve as reinforcing agents; papermaking and dehydrating the pulp to form a wet paper web; and finally, carrying out gradient drying and surface sizing on the wet paper web, wherein a sizing agent is an oxidized starch solution. Through fiber ratio optimization, enzyme pretreatment, low beating degree control, ternary enhancement system cooperation and gradient drying processes, the binding force between fibers is remarkably enhanced while high porosity is reserved, the prepared filter stick forming paper has high air permeability and high longitudinal tensile strength, and is applied to a high-speed cigarette making machine, and the hardness and water resistance of a filter stick are improved.

This invention relates to the field of packaging material manufacturing, and discloses a latent curing silicate-reinforced compression-resistant cardboard box and its production method. The compression-resistant cardboard box uses a reinforced adhesive layer to bond corrugated core paper and face paper. The raw materials of the adhesive layer include water, oxidized starch, liquid sodium silicate, urea, ammonium chloride, and active zinc oxide. The production method includes: pre-preparing a zinc-ammonia latent modified liquid, introducing it into a starch and silicate dispersion to obtain an adhesive, coating it, and then curing it under high-temperature hot pressing. This invention utilizes a hot-pressing decomplexing mechanism to release ammonia gas and lower the pH value of the system, inducing in-situ polycondensation of liquid sodium silicate to form a rigid polysilicic acid network, while simultaneously releasing zinc ions to chemically crosslink with starch and the inorganic framework. This solution solves the process problem of difficult high-concentration stable dispersion of inorganic rigid components in starch adhesive, ensuring that the adhesive has good rheological stability and operational adaptability during storage and coating stages.

The invention relates to an embolism microsphere with a photothermal effect and a preparation method and application thereof, and belongs to the technical field of embolism microspheres. The preparation method comprises the following steps: mixing starch and a cross-linking agent in water to obtain an aqueous phase solution; adding the water-phase solution into the oil-phase solution, and carrying out reversed-phase suspension polymerization reaction to obtain starch hydrogel microspheres; wherein the cross-linking agent comprises at least one of sodium trimetaphosphate or sodium tripolyphosphate; oxidizing the starch hydrogel microspheres with sodium periodate to obtain oxidized starch microspheres; the oxidized starch microspheres are subjected to surface modification by adopting dopamine, a polydopamine coating layer is formed on the surfaces of the oxidized starch microspheres, and the embolism microspheres with the photothermal effect are obtained. The embolism microspheres have degradability and drug loading performance at the same time, embolism-chemotherapy-photothermal triple therapy is cooperated, drug release can be controlled through the photothermal effect, and therefore the embolism microspheres can be effectively used for TAE or TACE treatment.

This application belongs to the field of insecticide technology, specifically providing a thiamethoxam compound insecticide and its preparation method. The preparation method of a thiamethoxam compound insecticide includes the following steps: cyclodextrin and water are mixed evenly, then an active ingredient and urea are added for inclusion. After inclusion, the mixture is spray-dried. The resulting cyclodextrin inclusion body is mixed with a starch coating solution, followed by the addition of glucomannan and a water-soluble metal salt. The mixture is stirred for a period of time and then dried to obtain the compound insecticide. The starch coating solution in this application is made from oxidized starch and water. The active ingredient used in this application includes thiamethoxam. The thiamethoxam compound insecticide prepared in this application has sustained-release properties, and the active ingredient can be released more completely, maintaining a high release rate of the active ingredient even in the later stages of sustained release.

The invention discloses a method for efficiently preparing oxidized starch, and belongs to the technical field of oxidized starch preparation, and the method comprises the following steps: preparing polyethylene glycol coated magnetic particles, adsorbing calcium, carrying out acylating chlorination, compounding, loading and carrying out oxidation reaction. The step of adsorbing calcium comprises the following steps: mixing polyethylene glycol coated magnetic particles, calcium chloride and absolute ethyl alcohol, stirring and centrifuging at normal temperature, and taking precipitates as the magnetic particles after adsorbing calcium; the loading comprises the following steps: mixing the composite oxidized starch with deionized water, stirring at 80-85 DEG C, cooling to room temperature, adding the calcium-adsorbed magnetic particles, stirring, adding sodium bromide, stirring, centrifuging, taking precipitate, washing and drying to obtain the loaded TEMPO. According to the method, the yield of the prepared oxidized starch can be improved while the oxidized starch is efficiently prepared, and the problem that TEMPO is difficult to recycle during preparation can be solved.

The application discloses an acid-neutral nano PHA paperboard reinforcing agent and preparation and application thereof, and belongs to the technical field of papermaking chemicals. The reinforcing agent is a bio-based nano water-based emulsion, and the core is that a stable high positive charge nanoparticle interface is constructed under an acid-neutral window through synergistic effect of polyphenols and amine polymers. The application solves the environmental safety hidden danger of traditional wet strength agents, and does not contain free formaldehyde and epichlorohydrin. The outstanding advantages are as follows: completely compatible with modern acid-neutral papermaking process, overcoming the defect that similar bio-based technologies need to react under alkaline; flexible application, can be efficiently used for wet part addition, or stably compounded with oxidized starch for surface sizing; high efficiency and energy saving, under the condition of lower addition amount and 105 DEG C conventional industrial drying, excellent wet strength retention rate and dry strength improvement can be realized, and no additional high temperature curing is needed.

The invention discloses a silane modified starch oil-proof agent as well as a preparation method and application thereof, and belongs to the technical field of preparation of green and environment-friendly oil-proof agents. According to the preparation method of the silane modified starch oil-proofing agent provided by the invention, oxidized starch is taken as a raw material, the oxidized starch is dispersed, filtered and freeze-dried to obtain pretreated starch, then the pretreated starch and a silane coupling agent are placed in absolute ethyl alcohol, the pH is adjusted to alkalescence, a grafting reaction is carried out, and the silane modified starch oil-proofing agent is obtained. And then cooling, suction filtration, vacuum drying and crushing are carried out, such that the silane modified starch oil-proofing agent is obtained. Starch molecular chain gaps are opened through pretreatment, hydrophilic hydrogen bonds are weakened, covalent bonds of a silane coupling agent and starch molecules are combined through chemical grafting modification, the hydrophilicity of a base material is reduced from the molecular structure level, a compact low-surface-energy hydrophobic layer is formed, the compactness and oil-proof barrier performance of a film layer can be improved, and the oil-proof barrier property of the film layer is improved. The problem that the existing modified starch oil-proof agent is poor in oil-proof performance is thoroughly solved.

The invention belongs to the technical field of starch powder microencapsulation, and discloses an anti-digestion starch microcapsule as well as a preparation method and application thereof. A shell of the microcapsule is an oxidized starch / whey protein isolate / polyphenol composite film, and an inner core of the microcapsule is starch powder; the mass ratio of the inner core to the shell of the microcapsule is 10: (1-4); the composite film shell is formed by compounding whey protein isolate, oxidized starch, polyphenol and a plasticizer according to the mass ratio of 2: (1-4): (0.2-2.4): (0.8-4). According to the invention, a powder coating technology is adopted, so that efficient and uniform coating of starch particles is realized. According to the technology, the uniformity and anti-digestion stability of the coating layer are remarkably improved, the film layer structure and release behavior can be precisely regulated and controlled, and the method has good process amplification and product consistency and is suitable for development and application of low-GI food, functional food, health care products and other products.

The application belongs to the technical field of oxidized starch production, and discloses a method for preparing oxidized starch by using double oxidants, which comprises sequentially adopting double oxidation and sodium hypochlorite to perform oxidation reaction, and after the aldehyde group of the oxidized starch by the double hydrogen peroxide is greater than or equal to 0.6%, sodium hypochlorite is adopted to perform oxidation. In the application, the hydrogen peroxide is used to first oxidize the hydroxyl group in the starch into an aldehyde group, and then the sodium hypochlorite is used to oxidize the aldehyde group into a carboxyl group. The amount of the sodium hypochlorite is greatly reduced, and the COD and salt content of the sewage formed in the production process are reduced, so that the pressure and cost of sewage treatment are reduced.

This application discloses a coating powder for non-fried foods and its application, belonging to the field of food processing technology. The coating powder composition for non-fried foods comprises the following components: Component A: a low cold water swelling base starch, wherein the cold water swelling base starch has a swelling degree of 1.2–4.0 and does not include oxidized starch, and comprises 15–35 parts by weight of the total weight of the coating powder composition; Component B: a medium-high cold water swelling α-starch, wherein the cold water swelling degree of the medium-high cold water swelling α-starch is 5–25, and comprises 8–20 parts by weight of the total weight of the coating powder composition; Component C: octenyl succinate starch, comprising 5–20 parts by weight of the total weight of the coating powder composition; Component D: a texture-improving material, comprising 15–35 parts by weight of the total weight of the coating powder composition; wherein the total content of components A, B, and C comprises 35–65 parts by weight of the total weight of the coating powder composition.

The invention belongs to the technical field of degradable mulching films, and relates to a polymer biodegradable mulching film and a preparation method and application thereof, the polymer biodegradable mulching film comprises the following components by weight: 40-60 parts of carboxymethyl cellulose, 40-60 parts of polyvinyl alcohol, 40-60 parts of trehalose, 40-60 parts of oxidized starch, 40-60 parts of a plasticizer, 40-60 parts of a wax emulsion, and 4-6 parts of glutaraldehyde; the concentration of the glutaraldehyde is 15%-30%. The macromolecular biodegradable mulching film provided by the invention can be completely degraded in a natural environment, and secondary pollution caused by residual micro-plastic in soil after degradation is avoided; the biodegradable mulching film has excellent water resistance, durability and mechanical properties, and solves the problems of poor water resistance, short service cycle and generally high production cost of a high-molecular biodegradable mulching film; and the production method is simple and low in cost.

The present application relates to the field of high silica glass fiber sizing agent, and particularly relates to a high silica glass fiber sizing agent and a preparation method thereof, wherein new sizing agent component raw materials are selected, and the mass percentage (wt%) of each component in the sizing agent is as follows: epoxy resin: 0.5-5.0, PAO-20: 0.5-5.0, isopropyl laurate: 0.5-2.5, S-80: 0.2-0.6, T-80: 0.2-1.2, oxidized starch: 0.2-1.5, ethylene-vinyl acetate copolymer: 0.3-2.5, citric acid: 0.1-1.5, and deionized water: 80.2-97.5. The sizing agent of the present application uses epoxy resin as a film former, PAO-20 as a plasticizer, isopropyl laurate as a lubricant, and various additives, thereby improving the wear resistance and lubrication rate of high-alkali high-silica glass fiber continuous yarn during the processes of drawing, spinning, and weaving, reducing the erosion of the atmosphere on the fiber, reducing the generation of fiber hair during the spinning process, and also improving the stability of the sizing agent emulsion under acidic conditions.

This invention belongs to the technical field of starch adhesive materials, specifically relating to a wash-resistant modified adhesive, its preparation method, and its application in TPU composite fabrics. This invention provides a method for preparing a wash-resistant modified adhesive, comprising the following steps: S1, firstly, oxidized starch and pyridine are mixed and stirred, then a phosphorus-containing modifier and 4-dimethylaminopyridine are added to react and obtain phosphorus-containing starch; finally, itaconic acid and 3-(isobutenoyloxy)propyltrimethoxysilane are used to graft the phosphorus-containing starch to obtain modified starch; S2, the modified starch and deionized water are mixed and stirred, then sodium silicate and kaolin are added and heated and stirred to obtain the wash-resistant modified adhesive. The adhesive of this invention has good wash resistance and flame retardant properties, making it better suited for use in TPU composite fabrics.

The invention belongs to the technical field of degradable mulching films, and relates to a fully biodegradable mulching film as well as a preparation method and application thereof, and the fully biodegradable mulching film is prepared from oxidized starch, sodium carboxymethyl cellulose, polyvinyl alcohol and a plasticizer; the adhesive comprises the following components in parts by weight: 15-25 parts of oxidized starch, 20-25 parts of sodium carboxymethyl cellulose, 12-20 parts of polyvinyl alcohol and 30-40 parts of a plasticizer. The oxidized starch is prepared from cassava starch. The full-biodegradable mulching film is obtained by compounding polymer materials, the raw materials in the formula are low in price, can come from agricultural wastes, do not generate micro-plastics in the degradation process, and can be fully biodegraded, so that the problem of environmental pollution caused by the mulching film is solved, and the sustainable development of agriculture is promoted; the antibacterial activity on escherichia coli is realized; the preparation process is simple and safe, only water bath operation is needed, and operation such as professional production line and pressurization is not needed.

The invention relates to the technical field of material chemical microcapsules, provides a degradable polyurethane wall material system and a preparation method thereof, and provides a water dispersible wall material system, solid components comprise an isocyanate group-terminated degradable polyurethane prepolymer and 2-hydroxyethyl aminated oxidized starch, and the two components form a covalent network through a urea bond and a carbamate bond; 25-45 parts by weight of a system solid component, the viscosity is 200-1500 mPa.s, the volume median particle size D50 is 80-300 nm, the system solid component can be emulsified and cured with a hydrophobic liquid core material to obtain a polyurethane / starch covalent network wall layer microcapsule, and the volume median particle size D50 is 1-20 m; the problem that solid components, viscosity, emulsification and curing are difficult to consider is solved, and the method is used for preparation and application of hydrophobic liquid core material microcapsules.

The invention belongs to the technical field of retanning agent preparation, and particularly relates to an environment-friendly melamine resin retanning agent and a preparation method thereof. The preparation method comprises the following steps: preparing oxidized starch from raw materials including starch, hydrogen peroxide and sodium persulfate; mixing and reacting with raw materials such as melamine, dicyandiamide, urea, formaldehyde, sodium sulfamate and the like to prepare a retanning agent prepolymer; and finally, sodium alginate intercalated LDHs and polyethylene glycol are added, mixing reaction is conducted, spray drying is conducted, the environment-friendly melamine resin retanning agent is obtained, the softness and thickening rate of leather can be effectively improved, and the content of free formaldehyde can be effectively reduced.

The application discloses a kind of bio-based nanofiber membrane and its preparation method and application in ethylene adsorption and fruit preservation;The application is by dispersing oxidized starch and pullulan in water, and is configured into the mixed solution of oxidized starch / pullulan with solute mass fraction of 15~30%, and starch-polyose compound paste solution is obtained by gelatinization;Add water-soluble protein, heat and stir to obtain electrospinning liquid;The electrospinning liquid is electrospun to obtain bio-based nanofiber membrane.The bio-based nanofiber membrane prepared by the application can adsorb ethylene gas in the environment under normal temperature and pressure as a green material, and has low cost, simple process and can be reused.The nanofiber membrane system prepared by selecting oxidized starch-pullulan-water-soluble protein can adsorb 3.19-15.40cm 3 / g ethylene gas under normal temperature and pressure, prolongs the shelf life of food, and comprehensively realizes the preservation of banana and other respiratory-peak fruits.