977 results about "Paper based" patented technology

The invention discloses a PHA / PVA nano-scale paper-based barrier emulsion as well as a preparation method and application thereof. The water-based emulsion comprises PHA particles with the average particle size ranging from 100 nanometers to 300 nanometers and PVA, the PHA and the PVA are blended according to a specific proportion, and the PVA serves as a main film forming component and a barrier property contribution component and is blended with the PHA to form the nano-emulsion. The preparation method comprises the following steps: mixing PHA particles with an initial average particle size of 1-100 microns with a PVA aqueous solution, and carrying out high-pressure homogenization and other nanocrystallization means to obtain the nano-emulsion. The emulsion can be coated on the surfaces of paper-based materials such as paper and paperboards, and a barrier coating is formed after the emulsion is dried. The obtained emulsion is small in particle size, good in stability and good in leveling property, a uniform and compact barrier film is easily formed on a paper base, the film has excellent water vapor, oxygen and grease barrier performance, and the material is bio-based, biodegradable and environmentally friendly.

The invention discloses a double-PHA barrier system for a paper-based container and a paperboard as well as a preparation method and application of the double-PHA barrier system, and belongs to the technical field of paper-based material surface engineering and green packaging. The system sequentially comprises a paper base material, a water-based PHA dispersion hole sealing layer and a PHA extrusion compact layer from inside to outside. According to the invention, the micron-sized PHA dispersoid without cell debris is utilized, so that an efficient hole sealing effect which is difficult to achieve by a high coating amount in a traditional process can be achieved by only needing an extremely low coating amount, and the pinhole defect of an extrusion layer is eliminated from the source. And in cooperation with the modified PHA extrusion layer with the specific crystallinity, the problem of micro-cracking of a single coating during edge rolling forming is cooperatively solved. According to the system, excellent barrier performance is achieved through a thinner bio-based structure, and meanwhile the system has a wide heat sealing window and excellent repulp recycling performance. Compared with the prior art, on the premise that high performance is guaranteed, the consumption amount of packaging materials and the environmental burden are remarkably reduced.

The present invention discloses a PHA / PVA nanoscale paper-based barrier emulsion, and its preparation method and application. The aqueous emulsion comprises PHA particles with an average particle size of 100 nanometers to 300 nanometers and PVA, wherein PHA and PVA are blended in a specific ratio, and PVA is blended with PHA as the main film-forming component and barrier performance contributing component to form the nanoemulsion. The preparation method comprises mixing PHA particles with an initial average particle size of 1 micron to 100 microns with a PVA aqueous solution, and processing the nanoemulsion by nano-processing means such as high-pressure homogenization. The emulsion can be applied to paper-based materials, such as paper and cardboard surfaces, and forms a barrier coating after drying. The emulsion obtained by the present invention has small particle size, good stability, good leveling properties, and is easy to form a uniform and dense barrier film on the paper base. The film has excellent water vapor, oxygen and grease barrier properties, and the material is bio-based, biodegradable, and environmentally friendly.

The invention discloses an impregnated paper surface uniformity detection method based on texture image analysis, and particularly relates to the field of image enhancement and texture analysis, and the method comprises the steps: obtaining an impregnated paper image, constructing an edge image based on a gray difference value, extracting an image region with an edge value lower than a first threshold value in the edge image, and defining the image region as a fuzzy region; and edge value difference calculation between adjacent pixels is carried out on the fuzzy region to form a difference chart, and a pixel region with an edge change value greater than a second threshold value is extracted from the difference chart and is defined as a fracture region. According to the scheme, the weak boundary between the adhesive film and the fiber is extracted by recognizing the fuzzy region with the low edge value and tracking the direction path of the fuzzy region, the problem that the low-contrast edge cannot be recognized through a traditional method is solved, and the detection precision of the non-uniform region is improved.

The invention relates to the technical field of papermaking, and particularly provides high-strength tipping base paper for cigarettes and a preparation process of the high-strength tipping base paper. The tipping paper base paper for the cigarettes comprises a fiber raw material; functionalizing the nano cellulose; a cellulase; a dry strength agent; a wet strength agent; and a sizing agent. Nano cellulose is functionalized and a synergistic stepped enhancement mechanism is constructed, so that the synergistic breakthrough of the high-strength raw tipping paper for cigarettes in the aspects of strength, wet strength and air permeability is realized; after the functionalized nanocellulose is subjected to carboxylation treatment, the hydrogen bond and electrostatic adsorption between the functionalized nanocellulose and the fiber are enhanced, and the bonding strength in a dry state and a wet state is remarkably improved; meanwhile, the wet strength agent is added in stages, and the adsorption sequence of the dry strength agent is optimized, so that the reinforcing agent constructs a stable three-dimensional network framework in the paper sheet, and the end breaking risk under high-speed winding is effectively reduced.

The invention discloses a light paper-based reflection lens for electromagnetic wave beam modulation and a planar reflection antenna thereof, and belongs to the technical field of antennas. The reflecting lens comprises a paper-based main body, the paper base main body is formed by forming a hole structure which is surrounded by a sheet-shaped paper base and is periodically arranged at intervals, and the paper base main body is provided with an upper surface and a lower surface which are opposite to each other and are respectively an electromagnetic wave control surface and a reflection plane; film-shaped symbol units made of metal materials are distributed and attached to the sheet-shaped paper base; the planar reflection antenna further comprises a feed source. The feed source is close to and inversely installed on the control surface, and the feed source reciprocates along the track of the control surface. An electromagnetic wave reflecting plate is arranged on the surface of the reflecting plane. The feed source can be placed at any position of the control surface, and electromagnetic waves emitted by the feed source at any position can be spread out of the reflection lens in a plane wave form after passing through the plane reflection antenna. Moreover, the bandwidth of wide-angle scanning realized by the plane reflecting antenna can reach 80%, which is far wider than that of the traditional reflecting surface antenna.

The invention discloses a preparation method of two-component microcapsule self-repairing insulation paper based on epoxy resin and polymercaptan. The preparation method comprises the following steps: (1) preparing a repairing agent microcapsule and a curing agent microcapsule by an emulsion polymerization method; (2) mixing the prepared repairing agent microcapsule and curing agent capsule to obtain a bi-component microcapsule solution, and adding the bi-component microcapsule solution into the treated paper pulp; and (3) performing papermaking, drying and calendaring on the paper pulp added with the bi-component microcapsule solution to obtain the insulation paper. According to the invention, diglycerol ether type bisphenol F epoxy resin (DGEBF) stabilized by an emulsifier is adopted as a core of a repairing agent, polythiol (PETMP) stabilized by the emulsifier is adopted as a core of a curing agent, and the emulsifier is cellulose nanofiber, so that the insulating paper with self-repairing performance is prepared. The dielectric constant, the breakdown field strength, the tensile strength, the elongation at break and the thermal stability of the insulation paper are superior to those of traditional cellulose insulation paper, and the overall performance and the service life of the insulation paper can be effectively improved.

The invention discloses a lightweight paper-based planar lens for electromagnetic wave beam modulation and a planar antenna thereof, and belongs to the technical field of antennas. The paper base main body is formed by forming a cavity structure which is surrounded by a sheet-shaped paper base and is periodically arranged at intervals, and the paper base main body is provided with an upper plane and a lower plane which are opposite to each other and are respectively an incident plane and an emergent plane of electromagnetic waves; thin-film-shaped symbol units made of metal materials are distributed and attached to the sheet-shaped paper base; according to the symbol units, the metal surface area of the symbol units in the unit volume in the paper-based main body is compared, and the metal surface area of the unit volume in the middle of the plane lens is larger than the periphery of the plane lens. The feed source is mounted close to the incident plane; the electromagnetic waves are propagated in the plane lens in a curve path and converge and are emitted out of the plane lens. When the feed source moves, wide-angle scanning of wave beams can be achieved, the gain reduction of the planar antenna is smaller than 2dB within the scanning range of + / -50 degrees, and meanwhile very high gain and aperture efficiency can be obtained.

The invention discloses a bio-based PHA oil-resistant and moisture-permeable coating for hamburger paper, coated paper and a preparation method, and belongs to the technical field of bio-based high polymer materials and paper-based food packaging. The coating is a PHA aqueous dispersion, and mainly comprises a semi-crystalline matrix PHA and a low-crystallinity or amorphous toughening PHA. The core of the coating is that after the coating is dried to form a film, a functional gradient structure can be spontaneously formed in the thickness direction of the coating: an interface layer close to a paper base is rich in toughening PHA so as to enhance toughness and adhesive force; and the surface layer of the coating is rich in matrix PHA so as to maximize the oil resistance. By means of the functional gradient structural design, the packaging material integrates oil resistance, moisture permeability and flexibility of the packaging material, has the degradable environment-friendly characteristic and is suitable for packaging high-grease food.

Provided are a lid, a container with the lid, and a combination of the lid and the container, which can prevent contents from leaking from the container with the lid while using a paper-based raw material, and can improve the recyclability. The lid is configured so as to be attachable to a container having an opening and an edge forming the opening, and has a top surface portion that covers the opening when attached to the container. The top surface portion has a paper-based substrate comprising a paper-based material, a penetration portion penetrating the paper-based substrate, a gas-liquid separation material capable of separating a gas in a gas phase and at least a portion of a liquid in the liquid phase from a mixed fluid having the gas phase and the liquid phase, and a thermoplastic coating agent. The gas-liquid separation material has a paper-based air-permeable sheet that includes long fibers and has air permeability, a liquid-repellent agent that imparts liquid repellency to the paper-based air-permeable sheet is disposed on at least one surface of the paper-based air-permeable sheet, and the gas-liquid separation material is disposed so as to cover at least a portion of the penetration portion in a plan view of the paper-based base material, and the gas-liquid separation material is disposed so as to cover at least a portion of the penetration portion in a plan view of the paper-based base material. And the coating agent is used for bonding the gas-liquid separation material and the paper base material.

The invention relates to a triple-hole paper-based three-dimensional cell culture chip as well as a preparation method and application thereof. The chip comprises a paraffin hydrophobic region and a paper-based hydrophilic region. The preparation method mainly comprises the following steps: 1) designing a mask plate; 2) cutting the mask plate by laser; and 3) preparing the triple-hole paper-based chip by hot pressing. The thickness of the chip is 100-200 [mu] m, the porous fiber structure of the paper-based material allows transportation of oxygen and waste, and a three-dimensional microenvironment for in-vivo cell growth can be simulated. Meanwhile, a transparent and liquid-tight supporting layer is fused on the lower layer of the paper-based chip, so that leakage of cells inoculated on the upper layer of the paper-based chip is avoided. The paper-based chip is embedded into a 6-pore plate, and bladder cancer cells (5637), mouse astrocytoma (U87) and human breast cancer cells (MCF-7) are inoculated in a paper-based hydrophilic region respectively. The cell compatibility of the paper-based chip and the growth behaviors of three different types of cells in three-dimensional paper fibers are investigated. It is proved that the chip can be used for researching three-dimensional construction and growth of human and mammalian cells, and the difference between three-dimensional culture and two-dimensional culture is revealed by detecting the proliferation capacity and survival rate of different cells.

The invention relates to a paper substrate bio-based high-barrier Pickering emulsion coating and a preparation method and application thereof, and belongs to the technical field of paper coatings, the prepared coating has excellent waterproof and oil-proof performance and is suitable for surface coating of substrates such as paper, the emulsion is prepared by taking glycerol as a plasticizer and chitosan as an oil-proof agent, and the emulsion is prepared by taking the chitosan as an oil-proof agent. The cellulose nanocrystal is used as an emulsifier, and the alkyl ketene dimer AKD and palm wax are used as an oil phase. After the emulsion is coated on the surface of paper, a high-barrier coating with a core-shell structure is formed, and the core-shell structure is clear through electron microscope observation; the hydrophobic angle of the coating can reach 130 degrees to the maximum, and the coating shows remarkable hydrophobicity and oil resistance. The coating is composed of bio-based materials, has the advantages of environmental protection and sustainability, is suitable for application requirements of degradable and green packaging, is simple in preparation process and excellent in performance, and can provide efficient barrier performance for paper packaging materials.

The invention relates to the technical field of adsorption functional materials, in particular to a plant fiber substrate-based instantaneous absorption type damp-proof drying sheet and a preparation method thereof, and the preparation method comprises the following steps: S1, selecting a plant fiber paper base meeting preset flatness and moisture content requirements; s2, the prepared materials are sequentially dispersed in pure water, then a silane coupling agent is added, and the uniform composite adsorption liquid is formed. S3, completely immersing the plant fiber paper base selected in the step S1 into the composite adsorption liquid; s4, the impregnated paper base is firstly subjected to rapid freezing treatment and then transferred into a controlled vacuum environment to be slowly heated; s5, drying the paper base in a constant hot air environment; and S6, the paper base is cut according to the design specification, and a dried sheet finished product is obtained. According to the plant fiber paper-based drying sheet disclosed by the invention, a multi-component composite moisture absorption system is combined with freezing-vacuum lock hole treatment, so that the synergistic improvement of the structural stability and the moisture absorption performance of the plant fiber paper-based drying sheet is realized.

The invention provides a preparation method of a glue-free repulping multi-layer high-barrier packaging material, which comprises the following steps: taking a first paper base and a second paper base, preparing a barrier coating, and adding a plasticizer into the barrier coating; coating the first surface of the first paper base with a barrier coating to form a first paper base barrier layer with a two-layer structure; the second surface of the second paper base is coated with the mixture to form a second paper base barrier layer with a two-layer structure; the high-barrier packaging material is prepared by making one side of the barrier material face to face, overlapping and hot-pressing, further, the plasticizer is a bio-based plasticizer, the formed high-barrier packaging material is of a two-layer split structure through design, the surfaces of the two split layers are both coated with the barrier material, and the high-barrier packaging material is obtained. The same barrier material is plasticized and combined by using a hot pressing process, so that a synergistic and associated effect from addition and use of an environment-friendly material to a processing process is formed, the interlayer binding force of the material is effectively improved, the problems of swelling and cracking of the material are prevented, and the comprehensive properties such as moisture, oxygen and re-pulping are improved.

The invention discloses a thermally stable gas diffusion layer material and a fuel cell, and relates to the field of fuel cells. When the heat-stable gas diffusion layer material is prepared, short-cut polyacrylonitrile carbon fibers are subjected to papermaking and then cured, and 3-aminothiophene is oxidized and grafted to prepare a modified carbon paper base layer; the preparation method comprises the following steps: carrying out a reaction on a single-layer graphene oxide nanosheet, 6-amino-2-mercaptobenzothiazole and 3-aminoethyl thiophene to prepare a modified single-layer graphene oxide nanosheet; the preparation method comprises the following steps: reacting polyvinylidene fluoride powder, 3-allyl thiophene and single-ended vinyl silicone oil to prepare a modified polyvinylidene fluoride emulsion; and uniformly mixing the modified single-layer graphene oxide nanosheet, a modified polyvinylidene fluoride emulsion and isopropanol, spraying on the modified carbon paper base layer, and reacting with 3, 4-ethylenedioxythiophene to prepare the thermally stable gas diffusion layer material. The thermally stable gas diffusion layer material prepared by the method has excellent porosity, thermal stability, conductivity and corrosion resistance.

The invention discloses a cigarette packet paperboard positioning method based on image analysis. The method comprises the following steps: projecting a structured light pattern to a target ink area; pulse energy is applied to a target printing ink area on the surface of the cigarette packet card paper to cause selective photo-thermal excitation, so that the cigarette packet card paper generates transient thermal elastic deformation; structured light stripe images are synchronously collected before and after the pulse energy is applied; based on the collected reference stripe image and the deformation stripe image, calculating to obtain a dynamic response characteristic field DRSF representing transient thermoelastic deformation generated by photo-thermal excitation of the target ink area; performing image segmentation on the DRSF to identify a deformation region, and extracting geometric features from the deformation region; and determining the position or posture of the target ink area according to the geometrical characteristics and the system calibration parameters. According to the invention, the limitation of the traditional visual positioning under specific conditions is overcome by utilizing the selective absorption of the ink on energy and the generated physical response, and the early warning of the microdefect can be realized at the same time.

The utility model discloses a degradable mulching film with opening parts, which is of a three-layer composite structure and sequentially comprises a paper base layer, a nutrient layer and a waterproof shading layer from bottom to top, the mulching film is provided with uniformly distributed cross-shaped opening parts, each cross-shaped opening part comprises four intermittent cut-off lines with the same starting point, and each intermittent cut-off line penetrates through the paper base layer, the nutrient layer and the waterproof shading layer; a drainage groove is formed in the position of each intermittent cutting-off line, the drainage grooves are symmetrically arranged with the intermittent cutting-off line as the symmetry axis, and the tip ends of the drainage grooves face the intersection point of the four intermittent cutting-off lines. The mulching film provided by the utility model is degradable, is convenient for trepanning, and has a drainage effect.

The invention discloses a paper-based composite film, which adopts a four-layer structural design, and the outer layer is an ultraviolet shielding layer formed by coating TiO2 with lignin; the transition layer is composed of 32-64 PLA / PBAT alternating microlayers, and the multiple alternating transition layers form a zigzag gas barrier path; ag-coated ZIF-8 nanoparticles are loaded on the paper base layer, so that long-acting antibiosis is realized by slowly releasing silver ions; and the inner layer adopts a PPC / PBS blend to support the heat sealing layer with adjustable heat sealing strength. According to the preparation process, a gradient micro-layer structure is constructed through a multi-runner co-extrusion die head and a layer multiplier, silver ions are loaded to ZIF-8 through an ultrasonic-vacuum impregnation process, the hydroxyl density of the surface of the paper base layer is improved through plasma treatment, good interlayer strength is achieved, ester bond crosslinking is induced in a pre-irradiation mode, and the product is prepared. The paper-based composite film has ultraviolet shielding, gradient blocking, slow-release antibacterial and controllable heat sealing performance, the interface bonding strength of a traditional paper-based composite film is greatly improved, all components are biodegradable, and the paper-based composite film is suitable for packaging of food, medicine and the like.

The invention relates to the technical field of plasma concentration monitoring methods, in particular to a method for rapidly detecting the content of tacrolimus in plasma through paper spray mass spectrometry. The method provided by the invention comprises the following steps: adding a to-be-detected plasma sample into a precipitation solution, vortex, taking supernate, and dropwise adding the supernate onto a paper base; spraying voltage is applied to the paper base, the paper base generates electrospray, and the electrospray enters a mass spectrometer for detection; preparing a gradient matrix matched tacrolimus standard solution, replacing the to-be-detected plasma sample with the gradient matrix matched tacrolimus standard solution, repeating the operation, recording a detection result, and drawing a standard curve by taking the matrix matched tacrolimus concentration as an abscissa and taking peak area data acquired by a mass spectrometer as an ordinate; and comparing the recorded detection result with the drawn standard curve, and quantitatively analyzing the content of tacrolimus in the to-be-detected plasma sample. The method disclosed by the invention is simple to operate and high in analysis speed, has relatively good precision and accuracy and also has high sensitivity and high selectivity.

The invention discloses a paper base-PHA double-sided composite soil biodegradable agricultural mulching film as well as a preparation method and application thereof, and belongs to the technical field of agricultural mulching materials and green high polymer materials. The mulching film comprises a paper base layer and a homologous polyhydroxyalkanoate covering layer arranged on the surface of the paper base layer. Through double-sided synergy of the water-based PHA coating on the soil sticking surface and the thermoplastic PHA extrusion film layer on the windward and rainy surface, and in combination with a'wet-to-heat 'integrated composite process and trace anhydride grafting, super-strong combination of a paper-plastic interface fiber tearing level is realized, and the problem that traditional paper-plastic is easy to layer is solved. Compared with a traditional fluorine-containing product, on the premise that total organic fluorine is not detected, the excellent barrier and moisture conservation performance is achieved with the thinner coating thickness by means of double barriers. The product has excellent mechanical laying adaptability and long-season weather resistance, is fully biodegradable, thoroughly solves the hidden dangers of micro-plastic residues and persistent organic pollutants, and is an ideal green agricultural covering material.

The invention relates to the field of substance moisture content detection, and particularly discloses a Xuan paper moisture content nondestructive testing method based on a near infrared reflection spectrum, which comprises the following steps: acquiring near infrared spectrum data of to-be-tested Xuan paper, inputting the near infrared spectrum data into a detection model, and then outputting a moisture content value of the to-be-tested Xuan paper, the method for constructing the detection model comprises the following steps: a, sample preparation: generating a multi-gradient water content Chinese art paper sample set through humidity control; b, spectrum acquisition: acquiring a reflection spectrum of the Chinese art paper sample in a set wavelength range; c, characteristic wavelength screening: carrying out characteristic wavelength extraction on the original spectrum data by adopting a competitive self-adaptive reweighting algorithm; and d, model training: establishing a partial least squares regression prediction model as a detection model based on the screened characteristic wavelengths. According to the method disclosed by the invention, the water content of the Chinese art paper is measured by utilizing the online nondestructive measurement characteristic of the NIRS technology, so that the rapid and nondestructive measurement of the water content of the Chinese art paper cultural relic body is effectively realized, and the preventive protection of the paper cultural relics is realized.

The present invention provides: an oil-resistant coating agent which exhibits excellent oil resistance and is obtained using mainly naturally derived materials that do not include petroleum-based materials or resin materials obtained using petroleum-based materials; an oil-resistant coating method in which said oil-resistant coating agent is used; an oil-resistant packaging material; and oil-resistant tableware. Provided is an oil-resistant coating agent of two-component type, the agent comprising: a main agent containing at least an alginate; and a secondary agent containing at least a polyvalent metal salt and xanthan gum. Provided is an oil-resistant coating method that includes: a main agent coating step for coating the main agent containing at least an alginate on a surface of a paper base; and a secondary agent supply step for supplying the secondary agent containing at least a polyvalent metal salt and xanthan gum to the main agent layer coated on the surface of the paper base. Provided is an oil-resistant packaging material that comprises an oil-resistant layer, which contains xanthan gum and a crosslinked body derived from a polyvalent metal alginate, on a surface of a paper base. Provided is an oil-resistant tableware that comprises a similar oil-resistant layer on an inner surface that is in contact with contents.

The invention provides a paper moisture content measuring method and system based on radar backscattering, and relates to the technical field of radar measurement, and the method comprises the steps: obtaining a to-be-measured target paper package, and determining the dielectric constant of the target paper package; transmitting a radar signal to the target paper parcel according to a preset angle and a preset frequency point, and receiving a returned radar echo signal; calculating a radar backscattering coefficient based on the dielectric constant of the paper package, the surface roughness, the radar parameter and the radar echo signal; based on the backscattering coefficient, a mathematical model between the backscattering coefficient and the water content in the paper is constructed through a linear regression method, and the mathematical model is solved to achieve measurement and calculation of the water content in the paper parcel. Through signal processing and image display, the moisture content in the paper can be intuitively reflected.

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.

This invention discloses a bio-based PHA oil-blocking and moisture-permeable coating for hamburger paper, the coated paper, and its preparation method, belonging to the fields of bio-based polymer materials and paper-based food packaging technology. The coating is an aqueous dispersion of PHA, mainly comprising semi-crystalline matrix PHA and low-crystallinity or amorphous toughening PHA. Its core feature is that after the coating dries and forms a film, it spontaneously forms a functional gradient structure along the coating thickness direction: the interfacial layer near the paper substrate is rich in toughening PHA to enhance toughness and adhesion; while the surface layer is rich in matrix PHA to maximize oil-blocking performance. Through this functional gradient structure design, this invention balances the oil-blocking, moisture-permeable, and flexible properties of the packaging material, and possesses biodegradable environmental characteristics, making it suitable for high-oil food packaging.

The invention discloses double-layer air filter paper with high interface adhesion as well as a preparation method and application of the double-layer air filter paper. The air filter paper is used as a paper base, nanofiber is deposited on the surface of the paper base through electrostatic spinning to form a fiber membrane, and then drying and thermal crosslinking are performed to obtain the air filter paper. A spinning solution adopted in the electrostatic spinning is a spinning solution obtained by dissolving polyurethane in a DMF / THF mixed solvent, and a silane coupling agent is added into the spinning solution for blending. The interface adhesive force between the fiber membrane and the paper base is improved by controlling the type, the adding amount, the thermal crosslinking temperature and the thermal crosslinking time of the added silane coupling agent, the diameter of the fiber is reduced to the nanoscale by regulating and controlling the parameters of the spinning solution, the composite stability of the double-layer air filter paper is guaranteed, and meanwhile the filtering performance of the air filter base paper is improved.

To provide an aqueous coating agent having superior heat sealability of a paper base material, particularly superior heat sealability even for a packaging body having a seal portion of a paper base material to which a content (more specifically, a powder) adheres.SOLUTION: Disclosed is an aqueous coating agent comprising: (A) thermally expandable microcapsule; and (B) a thermoplastic resin, wherein the aqueous coating agent comprises the component (A) in an amount less than 15 pts.mass based on 100 pts.mass of the total of the components (A) and (B).SELECTED DRAWING: None

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.