49 results about "Dialdehyde starch" patented technology

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 high-strength water-resistant starch adhesive and a preparation method thereof, and belongs to the technical field of preparation of environment-friendly adhesives. The problems of strength and mildew resistance of the starch adhesive are solved. The preparation method comprises the following steps: preparing 5-10g of polyethyleneimine into a 30-60wt% solution, weighing a certain mass of urea according to a molar ratio of (1-5): 1, adding the weighed urea into the prepared polyethyleneimine solution, and reacting for 8-14 hours in an oil bath to obtain a first branched polymer; 20-50 g of dialdehyde starch and 60-90 g of polyvinyl alcohol are added into a flask to prepare a starch solution, then the reaction temperature is set, uniform stirring is performed for gelatinization treatment, a second gelatinized solution is obtained, and after mixing reaction, a prefabricated high-strength water-resistant starch adhesive is obtained; and adding 5-10 g of cassava starch filler and 5-10 g of polymethyl silicon polyphenyl isocyanate, and stirring for 10-30 minutes to obtain the high-strength water-resistant starch adhesive.

The invention discloses a hydrogel slow-release fertilizer as well as a preparation method and application thereof. According to the hydrogel, sodium carboxymethyl cellulose, dialdehyde starch and gelatin are crosslinked to form a three-dimensional network structure, after the hydrogel is loaded with urea and other fertilizers, slow release of nutrients can be achieved (the release rate in 25 days is larger than or equal to 95%), and the hydrogel has high water absorption rate (35-45 times) and biodegradability (the soil degradation rate in 7 days is larger than or equal to 60%). The product is suitable for crop cultivation, and can significantly improve the fertilizer utilization rate and reduce environmental pollution.

The invention discloses yeast protein nutritional gel and a preparation method thereof, and belongs to the technical field of protein gel. Comprising the following steps: adding dialdehyde starch into a yeast protein solution, then sequentially adding EDC and NHS, fully mixing, and standing to obtain stable gel. The invention has the following technical effects: (1) the formation of a closer molecular network structure between YP and DS can be effectively promoted; (2) the mechanical property of the gel system is obviously improved; (3) an external structure is not introduced, and safety and environmental friendliness are achieved; and (4) rapid reaction can be realized under a mild low-temperature condition.

The invention relates to the field of biomedical materials, and particularly provides injectable adhesive carboxylated chitosan / dialdehyde starch hemostatic hydrogel and application thereof.The hemostatic hydrogel is formed by carboxylated chitosan sol and dialdehyde starch size through Schiff base reaction, hydrogen bond construction and in-situ rapid crosslinking by means of a bidirectional pumping and injecting delivery strategy, and the hemostatic hydrogel is prepared through a two-way pumping and injecting delivery strategy, and the injectable adhesive carboxylated chitosan / dialdehyde starch hemostatic hydrogel is prepared from the carboxylated chitosan sol, the dialdehyde starch size and the injectable adhesive carboxylated chitosan / dialdehyde starch hemostatic hydrogel. The hydrogel has the advantages of good biocompatibility, injectability, adhesion, personalized adaptation and the like, integrates multiple hemostasis mechanisms, a physical barrier effect of rapid gelation, an expansion compression effect of water absorption swelling, an electrical neutralization effect of carboxylated chitosan amino and a tissue adhesion effect of dialdehyde starch aldehyde group, realizes multi-scene rapid and efficient hemostasis, and has a wide application prospect. The preparation method of the injectable adhesive hemostatic hydrogel is low in cost, innovative in technology, mild in condition, convenient to store and beneficial to large-scale batch production, and has a wide application prospect in the field of efficient hemostatic hydrogel.

The invention relates to the technical field of papermaking and food packaging materials, in particular to a preparation method of full-degradable plastic-substituted high-strength food packaging paper. Preparing a fiber layer by taking plant fiber as a base material; the preparation method comprises the following steps: grafting a methyl methacrylate-butyl acrylate block copolymer on nano-cellulose through an atom transfer radical polymerization technology to prepare enhanced nano-cellulose; dialdehyde starch rich in aldehyde groups and chitosan are subjected to a Schiff base reaction to form a dynamic cross-linked network, polylactic acid microspheres modified by beta-cyclodextrin are introduced to serve as supramolecular enhancement units, and functional coating liquid is prepared; and finally, coating the functional coating liquid on the fiber layer, and drying, cross-linking and curing to obtain a finished product. Through cooperation of chemical grafting, dynamic covalent bonds and supramolecular action, the packaging paper is endowed with extremely high strength and toughness and excellent oil and moisture resistance and heat sealability, meanwhile, it is ensured that the packaging paper can be completely biodegraded in the natural environment, and functional replacement of traditional plastic packaging is successfully achieved.

The application belongs to the field of paper-based materials, and provides a high-strength paper-based packaging material and a preparation method thereof. First, a water-based polyurethane with complete biodegradability and better strength modification effect is developed by using polyester polyol as a reaction soft segment and using completely degradable composite monomers (DMPA and BDO) as raw materials, and then the water-based polyurethane is compounded with dialdehyde starch-PVA to prepare a high-strength paper-based packaging material, which comprises: the base paper is loaded with at least one dialdehyde starch / PVA layer; the dialdehyde starch / PVA layer is loaded with at least one water-based polyurethane layer; and the raw material of the dialdehyde starch / PVA layer is composed of the following raw materials in parts by weight: dialdehyde starch 1-6 parts, PVA 1-3 parts. The application develops a coating layer with high strength, so as to perform surface modification on paper and give the paper sufficient mechanical properties to meet the demand of replacing plastic products.

The invention belongs to the technical field of oil-proof coatings, and discloses a starch-based oil-proof coating as well as a preparation method and application thereof. The method comprises the following steps: 1) reacting cassava starch with sodium periodate under the condition that the pH is 2-4, centrifugally washing to be neutral, and drying to obtain dialdehyde starch; 2) dispersing dialdehyde starch in water, and then performing gelatinization treatment to obtain a dialdehyde starch solution; dissolving chitosan in an acetic acid solution to obtain a chitosan solution; and 3) mixing the chitosan solution with the dialdehyde starch solution, adjusting the pH value to be acidic, and reacting to obtain the starch-based oil-proof coating. The method is simple, green and environment-friendly; the prepared coating is safe and biodegradable, has excellent oil-proof performance, and improves the tensile strength and tear strength of the paper.

The application belongs to the technical field of soft capsules, and discloses a starch-based soft capsule material and a preparation method thereof. The preparation method comprises the following steps: mixing wheat starch and deionized water, adding a sodium periodate solution to react, so as to obtain dialdehyde starch; reacting the dialdehyde starch with glycidyl methacrylate and triethylamine, so as to obtain grafted modified starch; mixing the grafted modified starch with modified nano-silicon dioxide, and reacting after ultrasonic oscillation, so as to obtain nano-silicon dioxide composite modified starch; mixing the composite modified starch with polyvinyl alcohol and polyvinylpyrrolidone, so as to obtain a film forming solution; and after the film forming solution is cast and dried, hot pressing is performed, so that the starch-based soft capsule material is finally obtained. The starch is subjected to multiple hydrophobic modifications, so that the hydrophilic performance is reduced, and the stability of the soft capsule is improved.

The invention discloses a method for improving the anti-oxidation characteristic of a soybean whey protein-dialdehyde starch composite film by using chlorogenic acid, and belongs to the technical field of food processing. The preparation method comprises the following steps: step 1, preparing soybean whey protein; step 2, preparation of dialdehyde starch; 3, preparing a film forming solution; and step 4, preparing the soybean whey protein-dialdehyde starch composite film added with chlorogenic acid. The chlorogenic acids with different concentrations are added into a soybean whey protein-dialdehyde starch solution to prepare the composite membrane, and the influence of the chlorogenic acids with different concentrations on the antioxidant property of the soybean whey protein-dialdehyde starch composite membrane is comprehensively evaluated by measuring the ABTS < + > and DPPH free radical scavenging rates of the composite membrane. And a theoretical basis is provided for improving the comprehensive performance of the edible film and promoting the application of novel food packaging. Comprehensive analysis shows that along with the increase of the concentration of the added chlorogenic acid, the anti-oxidation characteristic of the composite membrane is gradually enhanced, and the chlorogenic acid can effectively improve the anti-oxidation characteristic of the composite membrane.

This invention belongs to the field of adsorption material manufacturing technology, specifically relating to a method for preparing a maicoene / biomass composite adsorption material and its application. The maicoene / biomass composite adsorption material is synthesized by a dual-aldehyde composite method using mono / few-layer maicoene powder and dialdehyde starch nanoparticles in equal mass ratio. The maicoene / biomass composite adsorption material of this invention has the characteristics of high adsorption performance, wide application range, high stability, and low cost, and can be used as an adsorbent for nonsteroidal anti-inflammatory drugs and azo dyes.

The invention discloses a preparation method of high-performance multi-network ionic conductive hydrogel. The preparation method comprises the following steps: preparing a prepolymer solution by taking polyacrylamide modified by polyvinyl alcohol, sodium carboxymethyl cellulose and sulfobetaine as a polymer matrix; adding dialdehyde starch to react for 1-2 hours, and adding a boric acid aqueous solution to react for 0.5-1 hour; adding an MXene nanosheet dispersion liquid and an ionic liquid to react for 3-4 hours; adding a suspension of mesoporous silica nanoparticles loaded with silver ions, carrying out ultrasonic dispersion, and adjusting the pH value to 7.5-8.5; and then forming, curing, washing and soaking in a boric acid aqueous solution in sequence to obtain the high-performance multi-network ionic conductive hydrogel. According to the preparation method of the high-performance multi-network ionic conductive hydrogel, disclosed by the invention, the ionic conductive hydrogel with a multi-network structure is successfully constructed, so that the ionic conductive hydrogel has excellent mechanical strength, effectively reduces ion leakage, improves the conductivity, and has long-acting antibacterial performance and an excellent self-healing function.

To provide a resin additive which is excellent in compatibility with a resin and dispersibility, when being used in a thermoplastic resin.SOLUTION: There are provided an additive for a thermoplastic resin which contains at least dialdehyde starch polyhydric alcohol adduct, wherein an aldehyde degree as an oxidation degree of the dialdehyde starch polyhydric alcohol adduct, which is a ratio of a repeating unit of a polymer having an aldehyde group in the dialdehyde starch polyhydric alcohol adduct, is 5 mol% to 30 mol%; a thermoplastic resin composition containing the additive for the dialdehyde starch-containing thermoplastic resin; and a resin molding.SELECTED DRAWING: Figure 2

The present invention provides an instant high-viscosity environmentally friendly printing paste and a preparation method thereof. The preparation steps are as follows: dissolve sodium alginate, carry out an acetalization reaction between alginic acid and dialdehyde starch under the catalysis of an acid, etc., to make it hydrophobic modified, and obtain a modified alginate-starch paste. After neutralization, ethanol precipitation, drying, pulverization, adding a phosphorus-free chelating dispersant, and packaging, the finished product is obtained. Under the action of a catalyst, sodium alginate and dialdehyde starch undergo an acetalization reaction to make sodium alginate hydrophobic modified, remove the hydrophilic hydroxyl groups in the alginate through the reaction, and reduce the agglomeration of the printing paste; through the two aldehyde groups of dialdehyde starch, sodium alginate on different molecular chains can be linked together, effectively increasing the molecular weight of the modified sodium alginate, thereby improving the viscosity of the printing paste and the paste formation rate of the printing paste.

The invention belongs to the technical field of polymer composite materials, and particularly relates to composite aerogel with an excellent fresh-keeping effect and a preparation method and application of the composite aerogel. The preparation method of the composite aerogel comprises the following steps: S1, uniformly mixing a gelatin solution and a dialdehyde starch solution, and stirring at 30-40 DEG C for 60-90 minutes until the viscosity of a system is increased by 20-30%; s2, adding a bamboo nano cellulose solution, and reacting at 85-110 DEG C to obtain a gel precursor solution; s3, freezing and drying the gel precursor solution to obtain composite aerogel; in the step S1, the pH value of the system after the gelatin solution and the dialdehyde starch solution are mixed is 4.0-5.0. According to the preparation method, the bamboo nanocellulose is introduced after the gelatin and the dialdehyde starch are subjected to pre-reaction, so that the problem of non-uniform crosslinking in the prior art is avoided. The composite aerogel prepared by the invention has higher structural stability and better cushioning performance.

The invention discloses a preparation method for optimizing the flavor of illicium verum wine through synergy of biotransformation and alcohol reduction, and belongs to the technical field of wine preparation. The method comprises the following steps: mixing illicium verum essential oil, a sugar donor, an immobilized enzyme preparation and a wine base, and catalyzing ethanol and the sugar donor to generate glucoside conversion reaction by using alpha-glucosidase under a control condition. The immobilized enzyme preparation is prepared by taking nano cellulose as a core carrier, coating the core carrier with hydrophilic polymer polyvinyl alcohol (PVA) to form a shielding layer, modifying chitosan, crosslinking and activating dialdehyde starch, and covalently coupling glycosidase. By utilizing the synergistic effect of enzymatic glucoside conversion and physical volatilization, the alpha-ethyl glucoside with a healthy function is generated while the alcoholic strength is reduced, and acetic acid accumulation caused by traditional oxidative alcohol reduction is avoided; meanwhile, the PVA hydrophilic shielding layer effectively blocks non-specific adsorption of the carrier to the hydrophobic star anise essential oil, so that the retention rate of flavor substances is increased, and the problems of boring flavor and rancidity of mouth feel are solved.

The invention discloses a gelatin film based on porous dialdehyde starch and tea polyphenol crosslinking modification and a preparation method thereof. The preparation method comprises the following steps: dispersing starch in an acetic acid buffer solution, adding a compound enzyme for enzymolysis, stirring, and adding an acidic material to adjust the pH of a starch suspension so as to terminate the reaction; porous starch solids are obtained; under a water bath condition, mixing the porous starch solid with water to form a starch suspension, adding an oxidizing agent, and adjusting the pH value of the system to 3-4 by using an alkaline substance; a porous dialdehyde starch solid is obtained; dissolving gelatin in water, stirring, sequentially adding porous dialdehyde starch, tea polyphenol and glycerol, and sequentially stirring and carrying out ultrasonic treatment; and transferring the obtained composite solution to a film forming device, and drying. The porous dialdehyde starch prepared by the invention can be used as a natural chemical cross-linking agent to construct an interconnected cross-linked network with tea polyphenol in a gelatin-based film, so that the difficult problems of poor mechanical property, low ultraviolet barrier property, weak oxidation resistance and the like of the gelatin film are synergistically improved.

The application discloses a gelatin-bacteriocin amino acid-dialdehyde starch composite film and a preparation method and application thereof. The preparation method of the composite film comprises the following steps: adding a crosslinking agent into a gelatin solution, adding N-hydroxysuccinimide into the gelatin solution after activation for a set time, then adding bacteriocin amino acid into the gelatin solution, coupling for a set time under weak acid condition and in the dark, and obtaining Gel-MAAs; dissolving the Gel-MAAs in water to obtain a composite solution; dissolving dialdehyde starch in water, gelatinizing, adjusting to weak alkalinity, and obtaining a dialdehyde starch solution; adding the dialdehyde starch solution into the composite solution, mixing uniformly, reacting at 35-45 DEG C for 1-3 h, adding glycerol with a mass fraction of 1-5%, ultrasonic degassing, pouring the film solution into a mold, and drying, and thus the composite film is obtained. The composite film has excellent mechanical properties, physicochemical properties, ultraviolet resistance, good biocompatibility, and great potential in the field of active composite films.

The invention belongs to the technical field of textile, and relates to a sizing yarn, a gray fabric and a desizing method thereof. The sizing yarn comprises a yarn body and a sizing film covering the surface of the yarn body, the yarn body and the sizing film are connected through an imine bond, the yarn body is the yarn body containing aldehyde groups, the sizing film is formed by cross-linking protein and protein through the imine bond by means of dialdehyde starch, the protein contains amino, the dialdehyde starch contains the aldehyde groups, and the imine bond is formed between the protein and the dialdehyde starch; grey cloth is formed by weaving the sizing yarn; the desizing method comprises the following steps of: immersing the grey cloth into acidic desizing liquid for washing, and performing acid response bond breaking of imine bonds, so as to finish desizing of the grey cloth. Through the innovative sizing yarn design, the preparation method and the desizing method, the problems existing in a traditional sizing technology are effectively solved, and the weaving efficiency, the fabric quality and the environment-friendly performance are improved.

The application relates to the technical field of drug carrier materials, in particular to a starch-based capsule and a preparation method thereof, which comprises the following steps: S1, after dialdehyde starch is gelatinized, the dialdehyde starch is mixed with a tannic acid solution, an iron chloride solution is added, uniform mixing and defoaming are carried out, and a film-forming solution is obtained; S2, a mold is immersed in the film-forming solution, preliminary drying is carried out under a set temperature and humidity condition after pulling up, and a gel film layer is formed; S3, the gel film layer after preliminary drying is demolded, humidity balance and drying are sequentially carried out, and the starch-based capsule is obtained. By adding tannic acid and a suitable amount of iron chloride, an effective crosslinking network structure is formed among starch molecules, the mechanical strength of the capsule shell is enhanced, and the hygroscopicity is reduced.

The present application relates to a kind of composite biomaterial for quick hemostasis and bone regeneration after tooth extraction and its preparation method.The composite biomaterial for quick hemostasis and bone regeneration after tooth extraction of the present application includes: dialdehyde starch, chitosan-o-diphenol, gelatin, PRP-loaded response material PEG-SS.Dialdehyde starch, chitosan-o-diphenol and gelatin synergistic effect, can quickly realize physical compression hemostasis, while adding PRP-loaded response material PEG-SS, can realize the slow release of growth factor, extend hemostatic effect, and can support bone regeneration.Further optimization in combination with preparation method, preparation as powder, can be directly filled, and swelling effect is good, hemostasis is fast, can provide long-acting hemostasis and healing support.

The invention relates to the technical field of environmental functional materials, in particular to a preparation method and application of a composite aerogel material.The preparation method comprises the steps that cassava starch and sodium periodate are mixed, pH is adjusted, stirring reaction is conducted for 5 hours, and freeze drying is conducted after centrifugal washing; the preparation method comprises the following steps: dispersing amino modified chromium ion metal organic framework 'NH2-MIL-101 (Cr)' powder in deionized water, adding dialdehyde starch, heating to 70 DEG C for gelatinization, then adding agar, and stirring; the sol is injected into a mold, retrogradation is conducted for 12 hours at the temperature of 4 DEG C, freezing and vacuum freeze drying are conducted for 48 hours, the composite aerogel is obtained, the prepared composite aerogel can efficiently adsorb polystyrene nano-plastic in water, dialdehyde starch in the aerogel serves as a cross-linking agent to enhance the stability of the material, silver nanoparticles can be reduced, and the stability of the material is improved. The maximum adsorption capacity to polystyrene nano plastic at 25 DEG C reaches 170.37 mg / g, and good regeneration performance and interference resistance are achieved. In addition, the leaching amount of chromium ions (Cr < 3 + >) is low, and the environmental protection standard is met.

The invention relates to the technical field of nitrogen fertilizers, in particular to a rice synergistic nitrogen fertilizer and a preparation method thereof. The invention overcomes the defects of low nitrogen fertilizer utilization rate and serious nitrogen loss in the use of the existing rice synergistic nitrogen fertilizer. The synergistic nitrogen fertilizer is obtained by performing double-layer coating on the nitrogen fertilizer, and the core component comprises urea and ammonium chloride; the inner layer film comprises the following components: corn starch, citric acid, dialdehyde starch, theophylline, dicyandiamide, sodium humate, glycerol and polyvinyl alcohol; the outer layer membrane comprises the following components: oxidized sodium alginate, a polylactic acid-glycolic acid copolymer, nano silicon dioxide, chitosan oligosaccharide, nano montmorillonite, thiourea and polyethylene glycol; wherein the oxidized sodium alginate is prepared from sodium alginate and sodium periodate, the prepared synergistic nitrogen fertilizer is good in slow release performance and small in nitrogen loss and can be used as a synergistic nitrogen fertilizer for rice, and the yield of crops is increased.

The invention provides a bone adhesive as well as a preparation method and application thereof, and belongs to the technical field of medical bone adhesives. The bone adhesive provided by the invention comprises isinglass, polyphenol and dialdehyde starch, the mass ratio of the isinglass to the polyphenol to the dialdehyde starch is (1-5): (0.2-2): (0.1-10). The bone adhesive provided by the invention is formed by crosslinking the isinglass, the polyphenol substance and the dialdehyde starch, has the advantages of good bone adhesiveness, high strength, good biocompatibility and degradability, can adhere fracture fragments, and provides a new strategy for fracture repair.

The application discloses a modified starch-based petroleum drilling aid and a preparation method thereof, and comprises the following steps: S1, oxidizing dialdehyde starch into polycarboxyl starch by using sodium chlorite; S2, performing esterification treatment on the polycarboxyl starch, and then performing amidation reaction on the polycarboxyl starch and sodium p-aminobenzenesulfonate; S3, performing reduction treatment on the amide bond by using a reducing agent; and S4, performing lipolysis on the starch after the reduction treatment to obtain the modified starch. The modified starch prepared by the application can greatly improve the temperature resistance and salt resistance by grafting a large number of rigid benzene rings and hydration groups, and has excellent effects of increasing viscosity, improving cutting and reducing filtration loss.

The invention discloses a paper pulp reinforcing agent for tea filter paper production and a preparation method thereof. The reinforcing agent is prepared from the following raw materials in parts by weight: 1 to 10 parts of cationized tannin, 2 to 25 parts of dialdehyde starch, 0.1 to 5 parts of aldehyde group binding agent, 0.05 to 2 parts of pH (Potential of Hydrogen) regulator and 60 to 95 parts of water. The preparation method comprises the following steps: performing cationization modification on natural tannin to obtain a cationized tannin solution; oxidizing starch with periodate to obtain dialdehyde starch; and mixing the two components with an aldehyde group binding agent and a pH regulator, and regulating the pH value to 4.0-6.5 to obtain the reinforcing agent. The cationized tannin is adsorbed on the surfaces of the fibers through electrostatic interaction, the dialdehyde starch is crosslinked with the tannin and the fibers through aldehyde groups, and the dry strength and the wet strength of the paper are remarkably improved through the synergism of the cationized tannin and the dialdehyde starch. The main raw materials of the reinforcing agent are renewable, formaldehyde-containing wet strength resin systems such as urea resin and melamine formaldehyde resin are not adopted, and the reinforcing agent is suitable for production of tea filter paper.

The invention discloses a retrogen-loaded hydrogel water-absorbing antibacterial liner as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing a gelatin solution and a dialdehyde starch solution to obtain a Ge-Ds solution; the preparation method comprises the following steps: mixing a bacterial cellulose solution with a Ge-Ds solution to prepare a Ge-Ds-Bc solution; and mixing the Postbio YDFF-3 solution with the Ge-Ds-Bc solution, heating and stirring, cooling the mixture to room temperature, pouring into a culture dish, transferring to the temperature of-20 DEG C, preserving for 24 hours, and freeze-drying to obtain the hydrogel water-absorbing antibacterial liner loaded with the metabiotics. According to the invention, gelatin, dialdehyde starch and bacterial cellulose are used as matrix substances, and the postbiotic postbioYDFF-3 is added as an antibacterial substance to prepare the water-absorbing antibacterial liner for refrigeration and preservation of grass carp, the water-absorbing antibacterial liner is used for absorbing blood water or percolate of grass carp meat and reducing moisture required by microbial reproduction, and the antibacterial effect of the postbiotic postbioYDFF-3 is utilized to improve the refrigeration and preservation effects of grass carp. Therefore, growth of spoilage microorganisms in the grass carp meat is inhibited, and the refreshing time of the grass carp meat is prolonged.

The invention relates to the technical field of tipping paper, in particular to a preparation method of tipping paper. The invention solves the problem that the existing tipping paper is difficult to give consideration to both physical strength and moisture resistance. The modified lignin and AKD are adopted in the bottom layer sizing agent for synergistic sizing, the modified chitosan and dialdehyde starch are adopted in the top layer sizing agent for constructing a chemical crosslinking wet strength network, and cellulose nanowhiskers and microcrystalline cellulose are compounded for nanometer enhancement; the top layer of the formed paper sheet is coated with a composite coating composed of modified zein and polylactic acid emulsion, and a physical moisture-resistant barrier layer is formed. Through the synergistic effect of internal enhancement, chemical wet strength and surface barrier, the prepared tipping paper has excellent physical strength and excellent moisture resistance.

The present invention discloses a method for preparing flexible paper, comprising the following steps: First, the paper raw materials are shredded, soaked, cooked, and bleached; Second, the paper raw materials are crushed and then soaked again, maintaining the pulp concentration between 3% and 4.5%; Third, polyacrylamide, sodium carboxymethyl starch, sodium dodecyl sulfonate, modified dialdehyde starch, and a flocculant are added to the pulp, and the volume ratio of the pulp to the above-mentioned additives is 100:1:2:5:4.5:0.15 in sequence. In the present invention, a set of spiral stirring paddles and four sets of spiral stirring frames are provided inside each of the two stirring bins. Through a set of spiral stirring paddles and four sets of spiral stirring frames, the stirring effect of the equipment on the pulp inside the stirring bins can be greatly improved, and the spiral stirring paddles and spiral stirring frames inside the two stirring bins can be driven to rotate and stir simultaneously through the driving device. While ensuring the stirring effect of the equipment on the pulp, the actual energy consumption of the equipment can also be effectively reduced.

The invention relates to the technical field of microencapsulation, in particular to microencapsulated tea oil and a preparation method thereof.The preparation method comprises the steps that nano-silica-grafted dialdehyde starch is prepared firstly, then the nano-silica-grafted dialdehyde starch serves as a solid emulsifier to prepare an O / W type Pickering emulsion containing tea oil, the Pickering emulsion is added into a chitosan solution to obtain a microcapsule solution, and the microcapsule solution is added into the chitosan solution to obtain the microencapsulated tea oil. The microencapsulated tea oil disclosed by the invention is high in mechanical strength, convenient to transport and preserve and excellent in high temperature resistance and oxidation resistance, and can be widely applied to food, health care products and daily chemical products.