111 results about "Oxidised starch" patented technology

The invention relates to the technical field of material science and engineering, and discloses a nanocellulose-based oil-water separation and adsorption composite material, which is prepared from the following raw materials in parts by mass: 35 to 45 parts of nanocellulose; 8 to 11 parts of bagasse cellulose; 10 to 15 parts of sodium lignin sulfonate; 4 to 8 parts of chitosan; 5-10 parts of oxidized starch; 5 to 8 parts of cellulose nanowhiskers; 2-5 parts of silicon dioxide nanoparticles; 0.5 to 1 part of calcium carbonate nanoparticles; 1-2 parts of a citric acid cross-linking agent; 1-2 parts of graphene oxide; 0.3 to 0.6 part of ethylene diamine tetraacetic acid; 2-5 parts of glycerol; 0.4 to 1 part of stearoyl chloride; 2-4 parts of nano iron oxide; the preparation method comprises the following steps: pretreating the raw materials, mixing the pretreated raw materials into slurry, carrying out crosslinking and ultrasonic dispersion, standing to obtain a basic mixture, injecting the basic mixture into a mold, carrying out freeze drying to form a photocatalytic layer, carrying out centrifugal dewatering, carrying out chelation reaction, spraying a composite solution, and carrying out vacuum drying to obtain the photocatalytic material. The obtained composite material has the advantages of efficient adsorption capacity, good mechanical properties, environmental friendliness, degradability and low preparation cost.

The invention discloses a novel composite fog dispersal catalyst formula and a preparation method thereof, and belongs to the field of manual intervention weather catalyst manufacturing. The catalyst comprises a hygroscopic agent, which can be calcium chloride, magnesium chloride, sodium chloride, urea, calcium hydroxide or magnesium hydroxide; the carrier agent can be oxidized starch, bentonite, diatomite, a molecular sieve or cellulose; and the dispersing agent can be silicon dioxide, fatty alcohol-polyoxyethylene ether, polyethylene glycol, fatty glyceride or titanium dioxide. The prepared catalyst has good hygroscopicity and dispersibility, and when the catalyst is sown in dense fog, the dense fog can be rapidly dissipated. The raw materials have high water absorption characteristic and dispersity and can accelerate dissipation of warm dense fog and improve visibility, most of the carrier materials are non-toxic and harmless environment-friendly materials, the content of chloride ions and alkali metal ions in the composite catalyst is effectively reduced by controlling the proportion, the corrosion effect caused by various ions is reduced, and the requirement for environmental protection is met.

The present invention relates to a high-temperature starch-type wetting agent and a preparation method and application thereof, wherein the wetting agent comprises an active ingredient and water, wherein the mass ratio of the active ingredient to the water is (0.05-0.15): 1, and the active ingredient 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, 4-6 parts of a coupling agent, 0.5-1.5 parts of a preservative, and 0.02-0.05 parts of a defoaming agent; wherein the plasticizer is cardanol acetate, tributyl citrate, and mannitol in a mass ratio of 1:1:(1.5-2); and the starch-based film-forming agent is at least one of acetylated distarch adipate, oxidized starch, and hydroxypropyl starch. The glass fiber yarn products produced with the wetting agent have significantly reduced scattered silk defects on the cloth surface, and the amount of powder falling during the weaving process is also greatly reduced, which meets the high standard requirements for the production of printed circuit boards.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The invention provides coated cloth with a Chinese art paper wetting effect, the coated cloth comprises a polyester plain weave fabric base layer, an esterification layer and a blade coating slurry layer, the esterification layer is tightly combined on the upper surface of the polyester plain weave fabric base layer and in gaps of polyester warps and wefts, and the blade coating slurry layer and the esterification layer are integrally formed; wherein the blade coating slurry layer mainly comprises oxidized starch and carboxylated nanocellulose, and the hydroxyl functional group content of the oxidized starch in the blade coating slurry layer is greater than the carboxyl functional group content of the carboxylated nanocellulose; the esterification layer is formed by esterification reaction between surplus hydroxyl functional groups of oxidized starch and citric acid dip-coated on the surface of the polyester plain weave fabric base layer. According to the invention, citric acid is used as a medium and reacts with surplus hydroxyl in the blade coating slurry to generate an esterification layer, so that the binding force between the blade coating slurry and the polyester plain weave fabric base layer is better; and the anhydrous citric acid can absorb water to obtain hydrate, so that the wetting effect of the coated fabric is better.

The invention belongs to the field of preparation of oxidized starch, and relates to a method for preparing oxidized starch by a mechanochemical method. Hydroxyl of corn starch is oxidized by hydrogen peroxide to generate modified starch with high carboxyl content, so that the modified starch has wider application. The preparation thought of a full bio-based mechanical method is adopted, the obtained modified starch has good economical efficiency, environmental safety and natural degradability, and the problems that an oxidized starch preparation process in the current market is large in environmental pollution, wastes resources, is tedious in process and the like are solved. According to the invention, biomass is used as a reaction raw material, is renewable and degradable, and accords with the green chemistry concept.

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.

The invention provides a chlorine-free environment-friendly oxidized cut starch water reducing agent as well as a preparation method and an application method thereof. A preparation method of a chlorine-free environment-friendly oxidized cut starch water reducing agent comprises the following steps: S1, oxidation pretreatment: carrying out two-step oxidation reaction on natural starch and 30% hydrogen peroxide under the action of a catalyst to prepare oxidized starch; step S2, acid cutting: gelatinizing the oxidized starch, adjusting the pH value to 1-3, cutting for 1.2-2 hours in an environment of 70-110 DEG C, and controlling the molecular weight to be 1500-2000; and S3, carrying out neutralization separation, adjusting the pH value to 6.5-7.5, adding ethanol, precipitating, taking the precipitate, washing, and drying to obtain the chlorine-free environment-friendly oxidized cut starch water reducing agent. The invention provides a preparation method of a starch-based water reducing agent without chloride ion residues, and solves the problem of corrosion of reinforcing steel bars in a traditional acid cutting method. Natural starch is used as a main raw material, the raw material is easy to obtain and low in cost; the process is simplified, no complex graft copolymerization equipment is needed, and the existing starch processing plant equipment can be directly transformed and utilized.

The application discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof. The paper comprises a paper base, a porous carrier is fixed on the paper base through oxidized starch glue, sodium chlorite, an activator and a stabilizer are loaded on the porous carrier, and the porous carrier is one of porous structures of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide. The application can stably and effectively realize slow release of chlorine dioxide, prolong the release period of chlorine dioxide, and realize long-acting and stable sterilization and disinfection.

The invention relates to the technical field of scale inhibitors, and particularly discloses a phosphorus-free scale inhibitor for water treatment and a preparation method thereof. The scale inhibition copolymer is designed as a main component of the phosphorus-free scale inhibitor, and the oxidized starch liquid, the amine auxiliary agent and the emulsifier are selected for synergistic cooperation. By using the scale inhibitor provided by the invention, water eutrophication caused by phosphorus element can be avoided, the accumulation of scaling can be effectively prevented, the corrosion of metal pipelines can be slowed down, and the scale inhibition requirement of industrial cooling water can be fully met.

The invention discloses starch-based composite photocatalytic whitening hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: compounding a cobalt-modified zirconium-based metal organic framework with oxidized starch, and then preparing the starch-based composite photocatalytic whitening hydrogel through a starch retrogradation method. The PCN-224 (Co) (at) OS composite photocatalytic whitening hydrogel with excellent photocatalytic performance and good biocompatibility is prepared through an in-situ growth method, the hydrogel has adhesion, moisture retention and stability, a more complete pore structure of a metal organic framework material is reserved, and the photocatalytic performance of the hydrogel is brought into play. Compared with traditional hydrogen peroxide blue-light whitening with poor safety, the high-efficiency, lossless and in-situ whitening of teeth is expected to be realized, and a new thought is provided for tooth whitening and development of biomedical green materials, and long-wavelength red light with high biosafety is matched to generate active oxygen to oxidize pigment molecules on the surfaces of the teeth.

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 discloses a hyperbranched starch-based intumescent flame retardant and a preparation method and application thereof.The preparation method of the flame retardant comprises the steps that starch and an oxidizing agent are fully mixed and react to form oxidized starch, and then the oxidized starch and 4 ', 4-diaminodiphenylmethane are fully mixed and react in an organic solvent to form a Schiff base compound; fully mixing and reacting the obtained Schiff base compound and phytic acid to obtain the hyperbranched starch-based intumescent flame retardant. The hyperbranched starch-based intumescent flame retardant solves the problem that the traditional bisphenol A epoxy resin is poor in raw material flame retardance, biomass starch which is wide in source and low in cost is used as a raw material, and a hyperbranched starch-based intumescent flame retardant is synthesized by forming a Schiff base structure and introducing a phytic acid structure on the Schiff base structure; the flame retardant is added into the epoxy resin, and multiple components in the flame retardant are synergistic, so that the flame retardance of the cured epoxy resin is remarkably improved, the preparation method is simple and convenient to operate, and industrial production is expected to be realized.

The invention discloses a flora double-layer capsule with long-term storage stability and a preparation method thereof, and belongs to the technical field of flora double-layer capsules, and the preparation method comprises the following steps: mixing probiotic freeze-dried powder and composite lysozyme, and reacting with alpha-lactalbumin to obtain probiotic-loaded nanoparticles; mixing the nano-particles loaded with the probiotics with sodium alginate to prepare an alginic acid capsule, and carrying out surface modification on the alginic acid capsule by using oxidized starch to obtain a flora single-layer capsule; and mixing the flora single-layer capsule and the hovenia acerba methanol extract to serve as a core material, and taking a chitosan acetic acid solution as a wall material to prepare the flora double-layer capsule. The lysozyme nano-particles can be adhered to the intestinal tract through interaction with mucus, and the lysozyme nano-particles can penetrate through a mucus barrier to be absorbed by epithelial villus, so that the absorption of intestinal flora is improved; the alpha-lactalbumin is coated on the surfaces of the nano-particles, and the alpha-lactalbumin is compounded with the lysozyme nano-particles, so that intestinal mucus can be more effectively penetrated.

The invention relates to the field of interior wall putty, and particularly discloses flame-retardant environment-friendly interior wall putty. The adhesive is prepared from the following raw materials in parts by mass: 10 to 20 parts of oxidized starch, 10 to 20 parts of guar gum, 10 to 15 parts of special adhesive powder for putty, 5 to 7 parts of carboxyl-terminated hyperbranched polyester, 1 to 3 parts of chitosan, 3 to 5 parts of graphene oxide, 3 to 5 parts of hydroxypropyl methyl cellulose ether, 3 to 5 parts of starch, 1 to 3 parts of sodium stearate, 1 to 3 parts of sodium hexametaphosphate, 1 to 3 parts of water glass, 1 to 3 parts of borate and 1 to 3 parts of nano antimony trioxide. 1-5 parts of coarse whiting, 1-3 parts of acetic acid aqueous solution with the mass fraction of 8-12%, 1-3 parts of ethanol, 1-3 parts of glycerol and 0.1-0.3 part of preservative. The invention also discloses a preparation method of the flame-retardant environment-friendly interior wall putty. The natural material guar gum is adopted and has a synergistic effect with various materials, so that the stability and flame retardance of a system are effectively enhanced.

The present invention discloses a fragrance bead and a preparation method thereof. The fragrance bead comprises the following raw materials in parts by weight: 35-50 parts of polyethylene glycol, 20-30 parts of water-soluble inorganic compounds, 5-15 parts of modified starch, 0.5-3 parts of essence microcapsules and 1-3 parts of essence; the modified starch comprises sodium carboxymethyl starch and oxidized starch. The fragrance bead of the present invention can be dissolved more quickly in water, and after the fragrance bead is dissolved, the essence can be better attached to the surface of the fabric fiber, so that it is slowly released at a certain speed, thereby achieving the purpose of making the essence attach to the clothes more effectively and for a longer time, and has the advantages of fast dissolution and long-lasting fragrance.

The invention relates to the technical field of functional polymer materials, in particular to a preparation method of a traditional Chinese medicine-nanocellulose composite tensile fiber fabric, which comprises the following steps: firstly, carrying out gradient functionalization treatment on nanocellulose, and grafting GMA (glycidyl methacrylate) and NIPAM (N-isopropylacrylamide); then preparing a traditional Chinese medicine microcapsule, extracting a Sanhuang compound, taking chitosan and sodium alginate as wall materials, and adopting a pH / temperature double-response cross-linking system; then blending the functionalized nanocellulose, the traditional Chinese medicine microcapsules and the oxidized starch with a PBAT solution to construct a composite material; directionally freezing the composite system on a temperature gradient device, and then freeze-drying to form a multi-stage directional pore channel structure; carrying out hot pressing treatment under the conditions of 60 to 70 DEG C and 1.5 to 2.5 MPa; finally, silanization surface hydrophobization, soft finishing and shaping treatment are conducted, the traditional Chinese medicine-nanocellulose composite tensile fiber fabric is obtained, and dual responses to sweat pH changes and body temperature rising are achieved.

The present invention discloses an outer coating paste for microwaveable pre-fried foods and its application, belonging to the technical field of fried food processing. The outer coating paste of the present invention comprises, by weight, 20-25 parts of strong dielectric starch, 20-25 parts of flour, 1-5 parts of soy protein isolate, 0.5-2.5 parts of xanthan gum, 0.5-1.5 parts of salt, 0.5-1.5 parts of spices, and 50-100 parts of water; the strong dielectric starch is obtained by cross-linking and modifying oxidized starch with calcium ions; the microwaveable pre-fried foods prepared using the outer coating paste have good crispness and color after microwave reheating, which solves the problem of loss of crispness faced by microwaveable fried foods, is conducive to promoting the industrial development of fried foods, a traditional food, and has broad application prospects in the field of fried food processing.

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 discloses oxidation-crosslinking modified starch with retrogradation resistance, a preparation method and application in PBAT (poly (butyleneadipate-co-terephthalate)). The preparation method of the oxidation-crosslinking modified starch comprises the following steps: S1, dissolving starch in water to prepare starch milk, adding a Dess-Martin oxidizing agent into the starch milk, and washing and drying a product to obtain oxidized starch; s2, dissolving tetraethylenepentamine and glycerol triglycidyl ether in dimethyl sulfoxide, and heating at a constant temperature to synthesize a cross-linking agent; and S3, uniformly mixing the oxidized starch, a cross-linking agent and a plasticizer in a high-speed mixer, and extruding through double screws to obtain the oxidized-cross-linked modified starch. The cross-linking agent with cross-linking and plasticizing functions is synthesized, and the cross-linking agent can improve the cross-linking efficiency and form stable hydrogen-bond interaction, so that starch retrogradation is inhibited. In addition, the oxidized starch and the cross-linking agent are subjected to a Schiff base reaction, so that a dynamic cross-linked network is formed in starch molecules, and the thermal stability of the starch can be improved.

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 invention belongs to the technical field of tipping paper, and particularly relates to low-air-permeability tipping base paper for cigarettes and a preparation process of the low-air-permeability tipping base paper, and the preparation process comprises the steps of pulping, papermaking and calendaring. Two kinds of pulp including bleached softwood pulp and bleached hardwood pulp are continuously pulped through a pulping machine, and the pulping degree is larger than or equal to 70 degrees SR; a non-porous filler and a neutral sizing agent are continuously added into the prepared mixed pulp, a binary retention aid composed of cationic starch and CPAM is added, and after the pulp is dehydrated and formed through a net part and a pressing part, wet paper sheets enter a pre-drying stage to be dried; the printing surface is coated with oxidized starch, the non-printing surface is coated with oxidized starch, PVA and a food-grade oil-proofing agent, and the coated paper sheet continues to be dried; and carrying out surface treatment on the body paper of the tipping paper for the cigarettes by using a soft calender. According to the invention, fibers are combined more tightly, pores are reduced, fiber gaps can be filled, and air permeability is reduced.

By applying a sprayable aqueous liquid laundry aftertreatment agent containing starch-based cationic polymer, oxidized starch ether and copolymer of the monomers (A) H2C=C(CH3)-C(=O)-(OCH2CH2) n -OR 4 and (B) H2C=CR 5 -CO2R 6 , where n is a number in the range 20 to 30, R 4 represents an alkyl group having 18 to 26 C atoms, R 5 represents H and CH3 and mixtures thereof, and R 6 stands for hydrogen, an alkyl group with 1 to 6 C atoms or mixtures thereof, the shape retention of washed laundry items is improved.

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.

The invention relates to the technical field of bacterial fertilizers, and particularly discloses a water-retaining and yield-increasing liquid microbial fertilizer, which is prepared from the following raw materials in parts by mass: 10 to 30 parts of liquid urea, 1.1 to 3 parts of monopotassium phosphate, 1 to 2 parts of ammonium molybdate, 0.1 to 0.5 part of ferrous sulfate, 0.1 to 0.5 part of zinc sulfate, 1.01 to 2.1 parts of polyglutamic acid, 0.1 to 1 part of xanthan gum, 0.1 to 1 part of sodium carboxymethyl cellulose, 5 to 15 parts of Chinese herbal medicine and 0.1 to 1 part of compound enzyme. The feed additive is prepared from the following components in parts by weight: 1-2 parts of oxidized starch, 0.1-0.5 part of magnesium sulfate, 0.1-1 part of compound zymophyte, 1-2 parts of gelatin, 1-2 parts of an emulsifier and 0.01-0.1 part of sodium trimetaphosphate. The invention also discloses a preparation method of the water-retaining and yield-increasing liquid microbial fertilizer. The organic fertilizer can effectively increase the content of organic matters in soil, improve the physicochemical properties of the soil, promote the growth and development of crop roots, and achieve the purpose of increasing the yield and income of crops.

The invention provides a bio-based epoxy resin surface sizing agent as well as a preparation method and application thereof, and belongs to the technical field of bio-modified materials. According to the invention, the bio-based epoxy resin is prepared by taking natural renewable rosin as a raw material and a green eutectic solvent as a catalyst; preparing a resin emulsion by using a compounded system of an anionic emulsifier and a nonionic emulsifier as an emulsifier; and adding a proper amount of oxidized starch and distilled water into the prepared emulsion, and reacting to obtain the sizing agent finished product. According to the prepared bio-based epoxy resin sizing agent, the functional monomer is introduced, the water resistance and various physical strengths are enhanced, the performance bottleneck of a traditional rosin sizing agent is broken through, and the defects that the traditional rosin sizing agent is poor in durability, prone to aging, poor in water resistance and the like are overcome. The water resistance, tensile strength, bursting strength, folding strength and other properties of the paper can be effectively improved, the problems that a traditional product is poor in durability and prone to aging are fundamentally solved, and a technical support is provided for replacing a plastic product with a paper product.

The subject of the invention is a starch hybrid copolymer in the form of an aqueous dispersion or a water-redispersible powder obtainable by radically initiated polymerization and optionally subsequent drying in the presence of a starch in an aqueous medium of ethylenically unsaturated monomers, characterized in that the starch comprises an oxidized starch, and the ethylenically unsaturated monomers comprise one or more vinyl esters and ethylene wherein the total amount of vinyl esters and ethylene is > = 81% by weight, based on the total weight of the ethylenically unsaturated monomers, whereby no ethylenically unsaturated monomers bearing allyl, epoxy, silyl or N-hydroxymethyl groups are copolymerized.

A coating composition for bakery foods with breadcrumbs for coating bakery food dough prior to attaching breadcrumbs, said composition containing one or more processed starches selected from the group consisting of an oxidized starch, an acid-treated starch and a heat-treated starch, wherein the oxidized starch, the acid-treated starch and the heat-treated starch having the following properties (A) and (B).　(A) When the viscosity of an aqueous suspension containing the oxidized starch, the acid-treated starch or the heat-treated starch is measured using a Rapid Visco Analyzer (RVA) (here, the aqueous suspension contains 25 mass% of said starch, and when the viscosity is measured, the temperature of the aqueous suspension is first held at 50°C for 1 minute, then raised to 95°C over a period of 7 minutes and 30 seconds, and then maintained at 95°C for 5 minutes), the peak viscosity is no higher than 2500 mPa·s. (B) The light absorbance of an aqueous suspension containing the oxidized starch, acid-treated starch or the heat-treated starch (where the aqueous suspension contains 0.5 mass% of said starch) is 0.6 or higher at 660 nm.