594results about How to "Improve barrier properties" patented technology

The invention provides super-strong barrier packaging paper and a preparation method thereof, relates to the field of high-barrier packaging paper, and aims to solve the problems that the barrier property of a traditional packaging material is reduced and the mechanical property is insufficient in a high-humidity environment. The packaging paper is composed of a coating barrier layer, a transparent film layer and a body paper base layer, and is prepared through a special process, so that the transmittance of oxygen and water vapor is remarkably reduced, and the shelf life of packaged contents is effectively prolonged. The preparation method comprises the following steps: mixing wood pulp fibers with a citric acid hydration solution, adding materials such as cationic starch to form fiber slurry, and drying to obtain the raw paper base layer; mixing and extruding acrylonitrile copolymer and other materials to form a transparent film layer; materials such as lignin and a citric acid hydration solution are mixed to form cross-linked slurry, the cross-linked slurry is mixed with a polymer solution to obtain a cross-linked coating, the raw paper base layer is coated with the cross-linked coating, the cross-linked coating is dried and then compounded with the transparent film layer, and the packaging paper has excellent barrier performance and mechanical performance and is particularly suitable for being used in areas with large temperature and humidity changes.

The invention discloses a packaging bag with high sealing performance and a preparation process thereof, and belongs to the technical field of packaging materials, the packaging bag comprises the following raw materials: polylactic acid, polycaprolactone, a nano-silver filler composite antibacterial agent and an epoxy compatilizer; the nano-silver filler composite antibacterial agent is formed by depositing a hybrid modified coating on the surface of a nano two-dimensional filler and then loading nano-silver; the hybrid modified coating is prepared from polydopamine and hyperbranched polyethyleneimine. The polylactic acid and the polycaprolactone are used as main base materials, and the packaging bag is endowed with good mechanical properties by utilizing high mechanical strength of the polylactic acid and excellent flexibility of the polycaprolactone; a nano-silver filler composite antibacterial agent and an epoxy compatibilizer are also added, the nano-silver filler composite antibacterial agent takes a nano-two-dimensional filler as a raw material, the nano-two-dimensional filler has a high length-diameter ratio and can block permeation of gas molecules, and the dispersion performance is improved by combining the nano-two-dimensional filler with the epoxy compatibilizer; the barrier property and the mechanical property of the packaging bag are further improved.

The invention belongs to the field of polymeric membranes. The invention relates to a BOPLA (biaxially-oriented polylactic acid) film with high stretching ratio and a preparation method thereof. The packaging film comprises the following raw materials in parts by weight: 80-90 parts of PLA; 10 to 20 parts of PPC-P (Polypropylene Chloride-P); 10-15 parts of a plasticizer; 3.0 to 5.0 parts of a chain extender; 0.3 to 0.5 part of an antioxidant; 0.5 to 1.0 part of a lubricant; 0.1 to 0.3 part of an anti-hydrolysis agent; wherein the total mass of the PLA and the PPC-P is 100 parts; the preparation method comprises the following steps: mixing, extruding and plasticizing the raw materials according to the formula, and carrying out an asynchronous two-way stretching process, heat setting, traction, slitting and rolling. According to the present invention, the defects of mechanical property degradation and poor optical property of the PLA under the high stretching rate in the prior art can be effectively solved, and the great application potential is provided.

The invention discloses a biodegradable sanitary towel with polylactic acid as a main component. The biodegradable sanitary towel comprises a degradable core body, and the degradable core body comprises a surface layer, an absorption core layer and a bottom layer; the surface layer is a polylactic acid fiber non-woven fabric; the polylactic acid fiber non-woven fabric is a polylactic acid fiber spunlace non-woven fabric, a polylactic acid fiber hot air non-woven fabric or a polylactic acid spunbond non-woven fabric; the absorption core layer comprises an upper layer, a middle layer and a lower layer; the upper layer and the lower layer are made of polylactic acid fiber non-woven fabrics, and the middle layer is a mixture composed of polylactic acid two-component fibers and super absorbent resin. And the bottom layer is a degradable impermeable film which is a PHA modified polylactic acid film. The composite material has natural weak acidity and natural antibacterial activity, can create a weak-acidity antibacterial microenvironment for people, is skin-friendly, environment-friendly and healthy, and is an ideal selected material for disposable hygienic products. The natural antibacterial agent has the functions of natural bacteriostasis, weak acidity and the like, and is biodegradable.

The invention relates to the technical field of coating preparation, and particularly discloses a multifunctional composite filler modified water-based coating and a preparation method thereof.The water-based coating is prepared from, by weight, 80-100 parts of modified core-shell acrylic acid dispersoid, 5-7 parts of multifunctional composite filler, 0.5-1 part of defoaming agent, 0.5-1 part of wetting agent, 2-5 parts of thickening agent, 1-2 parts of coalescing agent and 25-35 parts of deionized water. The water-based paint provided by the invention is modified by adding a proper amount of multifunctional composite filler, the performance is excellent, the stability is good, the components in the water-based paint have good compatibility by optimizing the preparation process conditions of the water-based paint, and the preparation method is simple to operate and suitable for industrial production.

The invention provides a slow-release antibacterial enhanced composite film for fruit and vegetable preservation and a preparation method thereof, and the preparation method comprises the following steps: performing sulfonation modification treatment on nano cellulose powder to obtain sulfonated nano cellulose; carrying out quaternization modification treatment on the sulfonated nano-crystalline cellulose to obtain quaternary ammonium sulfonated nano-crystalline cellulose; adding gelatin and sodium carboxymethyl cellulose into deionized water to obtain a wall material solution, and adding curcumin into the wall material solution to obtain a prepolymer solution; stirring and emulsifying the prepolymer solution at a high speed to obtain a prepolymer suspension; adding a chitosan solution into the prepolymer suspension to obtain a microcapsule solution, adding tannic acid into the microcapsule solution to obtain a microcapsule suspension, and performing spray drying to obtain double-layer microcapsule powder; the preparation method comprises the following steps: uniformly mixing polylactic acid, quaternary ammonium sulfonated nanocellulose, the double-layer microcapsule powder, a plasticizer, a lubricant and an antioxidant to obtain a mixed material, and sequentially carrying out melt extrusion, cooling, pelletizing and film blowing.

The invention provides a medical packaging material and a preparation method thereof.The preparation method comprises the steps that S100, polypropylene, maleic anhydride grafted co-polypropylene, peroxide and filler are mixed, then melt extrusion and two-way stretching are conducted, and a printing layer is obtained; s200, respectively preparing a barrier layer and a heat sealing layer; and S300, the heat sealing layer, the blocking layer and the printing layer are sequentially stacked from inside to outside, and the packaging material is obtained. Through the preparation method of the packaging material, the prepared packaging material has excellent barrier property and antibacterial property while resisting high temperature, and can meet the requirements of the medical field.

The invention relates to the technical field of packaging bags, and discloses a moisture-proof medical packaging bag material and a preparation method thereof. The moisture-proof medical packaging bag material comprises a paper layer and a plastic layer, the paper layer comprises modified kraft paper, and the plastic layer comprises the following raw materials in parts by weight: 70-100 parts of polybutylene terephthalate adipate, 30-50 parts of polypropylene carbonate, 5-7 parts of modified mica and 1.5-3 parts of cellulose acetate oleate. The moisture-proof medical packaging bag material prepared by the invention has good water resistance and mechanical properties, also has good degradability, and has a good application prospect.

The invention discloses a high barrier antibacterial flexible packaging material and a preparation method thereof, belonging to the technical field of flexible packaging composite materials. The flexible packaging material is composed of an outer layer, a barrier antibacterial layer and an inner heat-sealing layer from the outside to the inside; wherein the raw materials of the barrier antibacterial layer include 85 to 95 parts by weight of EVOH resin and 5 to 15 parts of an antibacterial modifier; the antibacterial modifier is an amine organic molecular cage composite nanosilver. The EVOH resin provides good barrier properties for the material, and the nanosilver in the amine organic molecular cage composite nanosilver can slowly release silver ions, giving the flexible packaging material certain antibacterial properties, and the composite of the amine organic molecular cage can improve the dispersibility of the nanosilver in the matrix resin on the one hand, and help improve the water absorption of the material on the other hand, reduce the influence of moisture on the EVOH resin, and effectively solve the problem of decreased barrier properties of the EVOH resin in a humid environment and increased probability of microbial contamination.

The invention provides a high-water-resistance optical film and a polarizing plate comprising the same. The high-water-resistance optical film comprises a base film, a water-resistance layer and an adhesive layer, the structure of the high-water-resistance optical film comprises a water-resistance layer, a first adhesive layer, a base film and a second adhesive layer which are stacked in sequence, or the water-resistance layer, the base film and the second adhesive layer which are stacked in sequence, the surface of the waterproof layer is provided with nanometer protrusions and micropore structures which are uniformly and orderly arranged. The high-water-resistance optical film has excellent hydrophobicity, the water-resistance layer can efficiently absorb ultraviolet radiation, the problems of aging, yellowing, embrittlement and the like of the optical film caused by ultraviolet radiation are effectively prevented, the high-water-resistance optical film can be applied to a polarizing plate, and the service life of the polarizing plate is greatly prolonged.

The invention discloses a preparation method of a multifunctional polyvinyl composite film and application of the multifunctional polyvinyl composite film in food preservation. The preparation method comprises the following steps: firstly, preparing Ag-coated MOF through a hydrothermal method, then uniformly dispersing the Ag-coated MOF and tannic acid into a carboxymethyl chitosan solution, and carrying out crosslinking modification on the Ag-coated MOF; and coating the prepared CMCS / TA / Ag (at) MOF mixed solution on a polyethylene film treated by oxygen plasma, and drying to form a film, so as to obtain the multifunctional polyethylene-based composite film. The CMCS and the TA are adopted to perform crosslinking modification on the Ag-coated MOF, so that the stability of the Ag-coated MOF can be further improved, and the release of silver ions is reduced. Compared with a common PE preservative film, the composite film prepared on the basis has better barrier capacity and mechanical property, and has antibacterial, anti-ultraviolet and anti-oxidation effects. The multifunctional preservative film is convenient to use and low in price, and has an important application prospect in the aspect of fresh-keeping packaging of meat products.

The invention relates to the technical field of single PE eleven-layer composite structure thin film material research and development, and discloses an eleven-layer ultrahigh-barrier polyethylene low-carbon environment-friendly film material and a preparation method thereof.The preparation method comprises the steps that a DOPO-based silane coupling agent is synthesized, the surface of sodium-based vermiculite is modified with the DOPO-based silane coupling agent to obtain flame-retardant modified vermiculite, and the flame-retardant modified vermiculite is modified with the DOPO-based silane coupling agent to obtain the eleven-layer ultrahigh-barrier polyethylene low-carbon environment-friendly film material. And the flame-retardant modified vermiculite is uniformly dispersed in an ethylene-vinyl alcohol copolymer matrix to prepare the flame-retardant barrier material. A flame-retardant barrier material is introduced into a PE co-extrusion film, and an eleven-layer co-extrusion blow molding film forming process is adopted to prepare an eleven-layer composite structure film which is made of a single PE material and has the thickness of 50-200 microns. The invention provides a preparation method of a single PE material eleven-layer composite structure thin film, and an eleven-layer thin film single product is prepared, has excellent barrier performance, belongs to ultrahigh barrier materials, and can be used as an optimal alternative selection in the field of dairy product packaging.

The invention discloses a high-barrier fast-curing solvent-free polyurethane adhesive and a preparation method thereof, and belongs to the field of preparation of polyurethane adhesives. The adhesive is composed of a component A and a component B, the component A and the component B are used in cooperation according to the functional group molar ratio of-NCO:-OH = 1.1-1.9: 1, and the component A is a modified isocyanate adduct formed by reaction of modified polyester polyol and polyisocyanate; and the component B is a mixture of castor oil derivative polyol, modified polyester polyol and polyether polyol. According to the adhesive, through selection of raw material monomers, design of a molecular chain structure and a specific molecular weight size and regulation and control of a molecular proportion, higher reaction activity and excellent water and oxygen blocking performance are achieved. The high-barrier fast-curing adhesive is excellent in peel strength and can meet the actual application process requirements of the adhesive, so that the high-barrier fast-curing adhesive can be widely applied to the field of composite flexible packaging.

The present application relates to the field of ABL aluminum-plastic composite sheets, and more specifically, it relates to an ultra-high barrier EVOH aluminum-plated composite sheet and a preparation method thereof. An ultra-high barrier EVOH aluminum-plated composite sheet comprises an outer film, a first adhesive layer, a barrier layer, a second adhesive layer, and an inner film fixedly arranged in sequence; the barrier layer is made of an aluminum-plated EVOH film, the aluminum-plated EVOH film comprises an EVOH film layer and an aluminum layer covering the surface of the EVOH film layer, and the EVOH film layer is prepared from a modified EVOH material, and the modified EVOH material comprises the following components in terms of the mass percentage of the modified EVOH material: 2‑8% muscovite, 1‑5% quartz powder, 1‑5% feldspar powder, 0.1‑0.5% coupling agent, and EVOH supplements the remainder. The composite sheet of the present application has a significant barrier effect on water and oxygen, and has good mechanical properties.

The invention belongs to the technical field of packaging materials, and particularly relates to an environment-friendly packaging material and a preparation method thereof. The packaging material comprises an inner layer and a surface layer which are sequentially arranged, the inner layer is prepared from the following raw materials in parts by weight: 65 to 85 parts of low-density polyethylene, 20 to 30 parts of metallocene linear low-density polyethylene, 5 to 10 parts of ethylene-vinyl alcohol copolymer and 1 to 2 parts of nano zinc oxide; the surface layer is prepared from the following raw materials in parts by weight: 20 to 25 parts of low-density polyethylene, 60 to 70 parts of medium-density polyethylene, 8 to 12 parts of modified montmorillonite and 1 to 5 parts of sedum sarmentosum extract. The environment-friendly packaging material has better barrier property and antibacterial property, and also has excellent mechanical property.

The invention relates to a continuous casting and rolling rapid processing technology of a medicine foil. The process comprises the steps of raw material preparation, smelting and refining, continuous casting, cooling treatment, heating and rough rolling, finish rolling, annealing treatment, surface treatment, slitting and the like. By controlling the smelting temperature, the casting speed, the rolling speed, the roller surface roughness, the annealing parameters and other process conditions, efficient production of the aluminum foil is achieved, and the surface smoothness, the thickness precision, the tensile strength and the ductility of the medicine foil are guaranteed. The thickness of the finished medicine foil is 0.02-0.04 mm, the tensile strength is 80-120 MPa, the ductility is not lower than 1.5%, and the surface roughness Ra value is controlled to be 0.1-0.3 micron. The process can produce high-quality medicine foil meeting the medicine packaging requirement, has the advantages of being efficient, stable, energy-saving and environment-friendly, and is suitable for large-scale industrial production.

The invention provides a medical packaging composite film and a preparation method thereof. The preparation method of the medical composite membrane comprises the following steps: S100, coating a first surface of an aluminum foil layer with an adhesive, attaching the first surface to a barrier material, and sequentially carrying out primary drying treatment and calendering treatment to obtain a barrier layer, an adhesive layer and the aluminum foil layer; s200, the second surface of the aluminum foil layer is coated with heat sealing slurry, secondary drying treatment is conducted, and the medical packaging composite film is obtained. The medical packaging composite film has excellent barrier property, biological safety, mechanical property and heat sealing property, and can provide reliable packaging protection for medical drugs.

The invention provides a full-biodegradable composite film and a preparation method thereof. The full composite membrane comprises an outer layer, a middle layer and an inner layer, wherein the outer layer comprises modified calcium carbonate, PLA, PBAT and an epoxy chain extender; the middle layer comprises modified montmorillonite, PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), PPC (polypropylene carbonate) and an epoxy chain extender; the inner layer comprises PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), an epoxy chain extender and an optional anti-blocking agent. The preparation method of the raw materials of the middle layer comprises the following steps: (i) dividing an epoxy chain extender used by the middle layer into an epoxy chain extender A and an epoxy chain extender B, and mixing PPC, modified montmorillonite and the epoxy chain extender A to prepare a first master batch of the middle layer; (ii) mixing PLA, PBAT and an epoxy chain extender B to prepare a middle-layer second master batch; and (iii) uniformly mixing the middle-layer first master batch and the middle-layer second master batch, extruding and granulating to obtain a middle-layer raw material. The full-biodegradable composite film prepared by the preparation method disclosed by the invention is good in uniformity and quality.

The invention provides silicone rubber for a composite insulator and a preparation method of the silicone rubber for the composite insulator. The silicone rubber composition is prepared from the following raw materials in parts by weight: 20 to 80 parts of first methyl vinyl silicone rubber raw rubber, 10 to 50 parts of second methyl vinyl silicone rubber raw rubber, 20 to 60 parts of white carbon black, 1 to 15 parts of hydroxyl silicone oil, 80 to 120 parts of aluminum hydroxide, 1 to 10 parts of P-N-Si tracking-resistant auxiliary agent, 0.1 to 2.2 parts of first silane coupling agent, 1 to 4 parts of dimethyl silicone oil and 0.01 to 1 part of release agent. The preparation raw materials of the P-N-Si tracking resistant auxiliary agent comprise a second silane coupling agent, phytic acid and melamine, the aluminum hydroxide is silane modified aluminum hydroxide, and the particle size D50 of the aluminum hydroxide is 1-5 [mu] m. Through cooperation of the P-N-Si anti-tracking auxiliary agent and the silane modified aluminum hydroxide, the filling amount of the aluminum hydroxide can be reduced while the anti-tracking performance of the composite insulator silicon rubber is improved, and the problems of processability and poor mechanical performance are effectively solved.

The invention relates to a wear-resistant high-strength glass protection safety film and a preparation method thereof, and belongs to the technical field of safety films. The silicon carbide whisker, the modified nano titanium dioxide and the graphene oxide are jointly prepared into the composite filler, and the strength and the wear resistance of the film are remarkably improved by utilizing the three-dimensional network structure of the silicon carbide whisker, the efficient filling and reinforcing effects of the nano titanium dioxide and the layered structure reinforcement of the graphene oxide; the permeation of small molecular substances such as moisture and oxygen is effectively blocked, and the barrier property of the membrane is improved. Meanwhile, the silane coupling agent is added, so that the compatibility and dispersity of the composite filler and the water-based resin emulsion are improved. The surface of the membrane is modified by heptadecafluorodecyl trichlorosilane, the hydrophobic performance of the membrane is remarkably enhanced, water vapor condensation and dust and dirt accumulation are reduced, meanwhile, the durability of the membrane is improved, and the wear resistance of the membrane is enhanced through chemical bonding.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength corrosion-resistant ABS composite flame-retardant material and a preparation method thereof. The ABS composite flame retardant material is prepared from the following raw materials in parts by weight: 60 to 75 parts of acrylonitrile-butadiene-styrene, 10 to 15 parts of glass fiber, 0.5 to 1 part of gamma-aminopropyltriethoxysilane, 8 to 12 parts of phosphorus-nitrogen flame retardant, 1 to 3 parts of nano aluminum oxide, 0.5 to 1 part of potassium perfluorooctane sulfonate, 1 to 3 parts of epoxy modified graphene oxide and 5 to 8 parts of modified nano montmorillonite. Through the synergistic effect of the epoxy silane modified graphene oxide and the long-chain alkylsilane modified nano montmorillonite, the mechanical property, the corrosion resistance and the flame retardant effect of an ABS matrix are remarkably enhanced. The modified material maintains toughness under high strength, effectively avoids embrittlement, and shows excellent impact resistance and environmental protection property.

The invention belongs to the field of waterproof and oil-proof agent materials, and particularly relates to an environment-friendly degradable fluoride-free oil-resistant and fat-resistant agent as well as a preparation method and application thereof, and the environment-friendly degradable fluoride-free oil-resistant and fat-resistant agent is prepared from the following raw materials in parts by weight: 40-50 parts of biological wax, 4-6 parts of modified polyacrylate, 15-20 parts of rosin, 1-2 parts of shellac, 75-100 parts of filler and 150-190 parts of deionized water. The oil-resistant and fat-resistant agent prepared by the invention can effectively prevent grease and water from permeating, has good waterproof and oil-resistant effects, and has good degradability.

The invention relates to the field of packaging materials, in particular to a high-barrier waterproof and oil-proof PHA composite film, a preparation method of the PHA composite film and a prepared protective inflatable bubble bag and paper cup. Comprising the following steps: dispersing PHA particles in a dispersion liquid to obtain a PHA dispersion with the solid content of 1-3%, and then carrying out vacuum distillation to obtain a PHA dispersion with the solid content of 60-70%; the method comprises the following steps: coating a PHA dispersion with the solid content of 60-70% on a base material, and drying at 145-155 DEG C to form a coating on the base material; and carrying out hot pressing on the surface containing the coating at 175-185 DEG C to obtain the PHA composite film. Through the production process, the obtained PHA dispersion with the solid content of 60-70% is subjected to coating, curing and hot pressing to form a stable PHA layer, so that the obtained PHA composite film has better barrier property and physical property.

In order to solve the problems that an existing acrylic polymer barrier coating for a paper-based material is insufficient in mechanical strength and prone to breeding bacteria, the invention provides a barrier coating composition for the paper-based material, a barrier coating and a paper base material. The barrier coating composition for the paper-based material comprises the following components: a water-based acrylic prepolymer, chitosan grafted polyvinyl alcohol, an inorganic filler, microcrystalline cellulose, water-based polyurethane, a polysiloxane grafted acrylic monomer, an epoxy group-containing acrylic monomer, 1, 4-butanediol diacrylate and a solvent. The barrier coating composition for the paper-based material provided by the invention has excellent water vapor barrier property and grease barrier property, and more importantly, the barrier coating composition for the paper-based material provided by the invention has relatively good antibacterial property on the premise of having excellent mechanical property, so that the barrier coating composition for the paper-based material provided by the invention can be used as a barrier coating for the paper-based material. The method is suitable for various food paper-based packaging products such as disposable paper cups, paper bowls and food boxes, and the food safety performance of the food paper-based packaging products is improved.

The invention discloses a preparation method of a high-barrier fresh-keeping film for food fresh-keeping packaging, belongs to the technical field of fresh-keeping film processing, and aims to solve the technical problem that the barrier property of a high-barrier fresh-keeping film to water vapor and oxygen and the tensile property of the high-barrier fresh-keeping film in the prior art need to be further improved. The preparation method comprises the following steps: adding barrier layer mixed particles, bonding layer mixed particles and a supporting layer material into a multi-layer co-extrusion extruder, carrying out melt extrusion, injecting into a multi-layer co-extrusion film machine, and carrying out blow molding to obtain the high-barrier-property preservative film which is compounded by five layers, namely a supporting layer, a bonding layer, a barrier layer, a bonding layer and a supporting layer from top to bottom, according to the invention, modified graphene is added into composite polyester of the barrier layer for modification, and waterborne polyurethane added with modified polysiloxane is prepared to obtain the bonding layer, so that the tensile property and the barrier property to water vapor and oxygen of the preservative film are further improved.

The invention discloses a method for simultaneously improving mechanical and barrier properties of a modified polylactic acid film, which comprises the following steps of: adding epoxy glyceride prepared by taking glyceride containing double bonds as a raw material into a raw material system of the modified polylactic acid film as a bio-based cross-linking agent; the formed composite system comprises the following components in parts by weight: 60-80 parts of polylactic acid; 10 to 30 parts of a biodegradable polyester elastomer; 1-10 parts of a bio-based cross-linking agent; 1-30 parts of light calcium carbonate; 0.1 to 2 parts of an antioxidant; the high-performance modified polylactic acid film is obtained by performing melt blending, extrusion and granulation on all the components through a double-screw extruder and then performing blow molding and film forming. The bio-based cross-linking agent is added into the modified polylactic acid film material, so that the compatibility among the components of the polylactic acid film material is improved, the mechanical property and barrier property of the material are improved, and the obtained polylactic acid film has high strength, high toughness, high barrier property and complete biodegradability; the requirements in the fields of food, medicine packaging, agricultural films and the like are met.

The invention relates to a preparation method of a starch-based film with excellent mechanical property and pH responsiveness, and belongs to the technical field of food storage. Cellulose nanofibril immobilized pullulanase is introduced to significantly enhance the mechanical property and barrier property of the starch film, and a curcumin pH sensitive natural pigment is added to significantly enhance the barrier property of the starch film. The starch film can change color according to the change of the pH value of the environment, so that the intelligent response capability of monitoring the freshness and the putrefaction degree of the food in real time is realized. The color of the starch film can be obviously changed from white transparent to yellow transparent, and the tensile strength, the contact angle and the maximum degradation temperature are respectively improved from 9.29 MPa, 66.3 DEG C and 314 DEG C to 13.41 MPa, 87.2 DEG C and 340.5 DEG C. The barrier property is also improved, and the barrier property is reduced from 6.23 * 10 <-12 > g.cm / Pa.s.cm < 2 > to 4.78 * 10 <-12 > g.cm / cm < 2 >. Pa.s. The sensitive reaction capability to ammonia water with different concentrations can generate obvious color change. Considering the anti-oxidation characteristic of curcumin, the composite film has a potential pork fresh-keeping effect.

The invention discloses a graphene-modified flame-retardant polypropylene material and a preparation method thereof. Graphene is dispersed through maleic anhydride grafted polypropylene to form a master batch, and flame retardants such as piperazine phosphate and sulfonyl bis(ethane-2,1-diyl)bis(diphenylphosphine oxide) are added; the graphene-modified flame-retardant polypropylene material is prepared by master batch-melting-smelting, the dispersibility of graphene in polypropylene is enhanced, the graphene is evenly dispersed in the mixed system, and the dispersion and combination of the flame retardant in the polypropylene matrix are further enhanced; the good barrier properties of graphene and the intumescent flame retardant produce a good synergistic effect, so that the compactness of the carbon layer formed by combustion is enhanced, and the flame retardant performance of the material is significantly improved.

The invention discloses a production method of hybrid rice seeds, and belongs to the field of agricultural breeding. According to the method, high-purity hybrid seeds are produced through the technical means of excellent female parent reproductive line cultivation, reproductive line reproduction, preliminary fluorescent sorting, further fine seed screening, artificial seed shell adding, hybrid seed production and the like. According to the method, the technical problem that the sorting effect and the seed purity of colorless seeds and colored fluorescent seeds are influenced due to the fact that the precision of a color sorting technology cannot reach 100% due to difference or abnormal development of maturity of reproductive line seeds of a common nuclear male sterile line can be solved, and sterile line seeds meeting the market standard are obtained.

The invention provides a bacteriostatic high-barrier nano-cellulose-based composite film for fruit and vegetable preservation and a preparation method thereof, and the preparation method comprises the following steps: carrying out sulfonation modification treatment on nano-cellulose powder by using 1, 3-propane sultone to obtain sulfonated nano-cellulose; then, octadecyl trimethyl ammonium chloride is adopted for conducting quaternization modification treatment on the sulfonated nano-crystalline cellulose, and quaternary ammonium sulfonated nano-crystalline cellulose is obtained; the preparation method comprises the following steps: dispersing silver-loaded chitosan in deionized water to obtain a silver-loaded chitosan solution, adding montmorillonite into the silver-loaded chitosan solution, mixing, stirring and heating, and then carrying out suction filtration, washing and drying to obtain intercalated montmorillonite; the preparation method comprises the following steps: uniformly mixing polylactic acid, quaternary ammonium sulfonated nano-cellulose, intercalated montmorillonite, a plasticizer, a lubricant and an antioxidant to obtain a mixed material, and sequentially carrying out melt extrusion, cooling, pelletizing and film blowing on the mixed material to obtain the antibacterial high-barrier nano-cellulose-based composite film.