109 results about "Gel free" patented technology

The invention relates to the technical field of BOPP (biaxially-oriented polypropylene) films, in particular to a scratch-resistant adhesive-free matt film and a preparation method thereof, and the scratch-resistant adhesive-free matt film comprises a matt layer, a core layer and a thermal composite layer which are sequentially arranged, the matt layer comprises co-polypropylene, high-density polyethylene, 2.0-2.5 wt% of linear alkyl silicone (the weight-average molecular weight is 12-150 thousands, and the surface tension is 42-45 mN / m) taking maleic anhydride modified aziridine as a terminal group, and 2000-4000 ppm of spherical polymethyl methacrylate (the particle size D50 is 4.0-5.0 microns); the core layer comprises homo-polypropylene; and the thermal composite layer comprises an ethylene-vinyl acetate copolymer and 2000 to 4000 ppm of a spherical anti-blocking agent. According to the scratch-resistant adhesive-free matt film, through collaborative design of the components of the matt layer and the thermal composite layer, balance of scratch resistance, high surface tension (printing applicability) and winding and unwinding smoothness of the surface of the matt layer is achieved, and a solution for the scratch-resistant generality problem of the matt surface of the high-end BOPP matt film is provided.

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 present application relates to the technical field of BOPP film, in particular to a scratch-resistant glue-free matt film and a preparation method thereof, the scratch-resistant glue-free matt film comprises a matt layer, a core layer and a thermal composite layer arranged in sequence, the matt layer comprises copolymerized polypropylene, high-density polyethylene, 2.0-2.5 wt% maleic anhydride modified aziridine as an end group of linear alkyl silicone (weight average molecular weight 120-150 thousand, surface tension 42-45 mN / m) and 2000-4000 ppm spherical polymethyl methacrylate (particle size D50 is 4.0-5.0 microns); the core layer comprises homopolymerized polypropylene; and the thermal composite layer comprises ethylene-vinyl acetate copolymer and 2000-4000 ppm spherical anti-blocking agent. Through the synergistic design of the components of the matt layer and the thermal composite layer, the scratch-resistant glue-free matt film realizes the balance of the surface scratch resistance of the matt layer, the high surface tension (printability) and the smoothness of the winding and unwinding, and provides a solution to the common problem of the scratch resistance of the matt surface for high-end BOPP matt film.

The utility model relates to the technical field of oral corner protection patches, and discloses a disposable oral corner protection patch special for dental operation, which comprises an oral interior part and an oral exterior part arranged on one side of the oral interior part, and J-shaped aluminum sheets are arranged in the oral interior part and the oral exterior part. According to the disposable oral corner protection patch special for dental operation, the J-shaped aluminum sheet is completely wrapped by the medical silica gel, the effects of supporting the appearance of the medical silica gel and adjusting the thicknesses of different oral corners are achieved, the whole patch is made of the medical silica gel, the aluminum sheet is wrapped on the inner side of the patch, the high rebound resilience of the medical silica gel plays a role in buffering the oral corners, and the side face of the patch is in a half-moon arc shape. The medical polyurethane adhesive is attached to the inner side of the oral outer portion, the inner side of the oral inner portion is free of adhesive and smooth, the medical polyurethane adhesive is attached to the inner wall of the oral cavity through opening and closing of the J-shaped aluminum sheet, the outer side surfaces of the oral outer portion and the oral inner portion are rough, and slipping of instruments during operation of a doctor is prevented; the rough surface can prevent the saliva suction tube from slipping and falling off.

The utility model discloses a blanking device of a paper-plastic glue-free film laminating machine, which relates to the technical field of paper-plastic glue-free film laminating machines and comprises a paper-plastic glue-free film laminating machine body. The clamping assembly is used for fixedly clamping the film-coated material; the lifting assembly is used for driving the clamping assembly to move up and down; the transverse moving assembly is used for driving the clamping assembly to move transversely; the collecting assembly is used for collecting the material subjected to film covering; the clamping assembly comprises clamping plates and a lifting plate, the two clamping plates are symmetrically arranged, the top ends of the clamping plates are fixedly connected with connecting rods, and rubber pads are arranged on one sides of the clamping plates. The supporting assembly and the collecting assembly are arranged on one side of the paper-plastic glue-free film laminating machine body, and the transverse moving assembly, the lifting assembly and the clamping assembly are arranged on the inner side of the paper-plastic glue-free film laminating machine body, so that film-laminated materials can be effectively discharged, the discharging efficiency is effectively improved, discharging is convenient and rapid, and the labor amount of workers is reduced.

The invention belongs to the field of air filtering materials, and provides a non-gel activated carbon air filtering non-woven fabric. The design that the activated carbon particles are coated with polydopamine in situ and covalently connected with the nylon 6 fibers through Schiff base bonds and Michael addition bonds is adopted, and firm loading of the activated carbon particles in the non-woven fabric can be achieved without adding an independent binder; the problem that the adsorption efficiency is reduced due to the fact that a traditional binder blocks activated carbon micropores is solved. The thickness of the polydopamine coating layer is controllable, the loading capacity of the activated carbon can reach 5-40 wt%, low filtering resistance and high adsorption efficiency are still kept under the high-loading condition, the spunlace reinforcing technology ensures the particle distribution uniformity and batch stability, the tensile strength is not lower than 5 N / 5 cm, and the air purification application value is wide.

The invention discloses a wafer-level ultra-flat clean graphene electron microscope grid and a preparation method and application thereof. The method comprises the following steps: placing a target transmission electron microscope grid on the surface of a two-dimensional material on a hard growth substrate; a substance capable of generating molecular self-assembly is dissolved in a low-surface-tension organic solvent to prepare a fitting solution, the fitting solution is dropwise added to the surface of the structure, and tight fitting at the normal temperature is achieved after the solution is volatilized; etching to remove the hard growth substrate; and finally, washing with deionized water and isopropanol. According to the method disclosed by the invention, by utilizing the self-assembly effect of molecules and the characteristic of a low-surface-tension solvent, glue-free and normal-temperature transfer is realized, polymer residues are avoided, and the ultra-flatness and high cleanliness of the graphene surface are ensured; the method has the advantages of high universality, simple process and high yield, and is particularly suitable for batch production of 4-inch wafers.

The invention relates to the technical field of hygienic products, in particular to an air-laid glue-free core body for solidifying fluff pulp and SAP (Super Absorbent Polymer) by using superfine melt-blown fibers. The preparation method comprises the following steps: forming fluff pulp fibers into a base material layer through air laying; applying the modified SAP material to the substrate layer; the polymer melt forms melt-blown fibers through a melt-blowing process, and the melt-blown fibers directly deposit and penetrate into the SAP-containing base material layer when the melt-blown fibers have thermal viscosity to form a three-dimensional intertwining structure; and finally, carrying out hot pressing treatment on the structure, and realizing integral solidification under the condition of no additional adhesive by utilizing the thermal viscosity of the melt-blown fibers. The modified SAP material is obtained through pretreatment of an epoxy compound and coating treatment of mixed slurry of nanocrystalline cellulose and a functional additive. The problems that SAP particles in a traditional core body are prone to migration, powder falling and gel blocking are effectively solved through the glue-free solidification technology, and the obtained core body is high in absorption speed, low in back seepage amount, stable in structure and suitable for sanitary products such as paper diapers and sanitary napkins.

The application provides a glue-free flexible copper-clad plate and a preparation method thereof. The glue-free flexible copper-clad plate comprises a conductive layer, a first film layer and a second film layer which are stacked in sequence. One side surface of the conductive layer is provided with first protrusions, one side surface of the first film layer is provided with second protrusions, and the side of the conductive layer provided with the first protrusions is completely attached to the side of the first film layer provided with the second protrusions. The material of the first film layer is thermoplastic material, and the material of the second film layer is thermosetting material. The glue-free flexible copper-clad plate has good heat resistance, high dimensional stability, small thickness, high bending resistance and strong bonding force between the conductive layer and the first film layer.

The invention belongs to the technical field of liquid cooling plates, provides a shielding method of a powder spraying liquid cooling plate, and solves the technical problems of convenience of continuous shielding and rapid shielding removal of the liquid cooling plate. The method comprises the following specific steps: (1) customizing spacing gummed paper; (2) overlapping and positioning the edge of the non-adhesive area of the interval adhesive paper and the edge of the powder spraying liquid cooling plate; and (3) shielding the to-be-sprayed surface of the powder spraying liquid cooling plate after positioning, and wrapping the back surface of the to-be-sprayed surface with redundant gummed paper to complete shielding. Aiming at the requirement that the periphery of the powder spraying liquid cooling plate needs to be shielded on the front and back surfaces and the side surfaces, shielding can be quickly carried out, the adhesive width on the two sides of the adhesive tape is the same as the shielding width, the middle non-adhesive area is reserved, and the product edge is used as a reference line to be aligned with the adhesive inner edge of the adhesive paper for positioning during shielding, so that the shielding tolerance is ensured. And meanwhile, shielding removal after powder spraying and baking is also friendly, so that the working hours of front and back surface shielding, side surface shielding and shielding removal are greatly saved, and the labor cost is saved.

The application relates to a synthesis method and application of a heat-adhesive polyimide and polyimide film, and steps are as follows: a plurality of portions of diamine monomers and a plurality of portions of dianhydride monomers are prepared into a polyimide acid solution, then a glue film is prepared, and a heat-adhesive polyimide film is obtained after complete imidization at high temperature. The application proposes a novel heat-adhesive polyimide film containing N and S atom coordination elements, which has a low thermal expansion coefficient, high heat adhesion, high heat resistance and high tensile strength, and can be applied to the production of glue-free double-sided flexible copper-clad plates (2L-FCCL) by a laminating method. Compared with existing commercial polyimide films, the heat-adhesive polyimide film in the application can be strongly attached to copper foil in a heat processing process without an additional epoxy resin or acrylic adhesive, and thus is suitable for the rapid production of 2L-FCCL by a hot pressing method, the peel strength of the heat-adhesive polyimide film reaches above 0.6 N / mm, and the highest peel strength reaches 1.2 N / mm, and the heat-adhesive polyimide film has a good application prospect in the field of glue-free flexible copper-clad plates.

The utility model belongs to the technical field of packaging boxes, and particularly relates to a glue-free dessert portable box structure which comprises a bottom plate, and four edges of the bottom plate are respectively connected with a left side plate, a right side plate, a front side plate and a rear side plate. The left side plate and the right side plate are in mirror symmetry in structure and each comprise a first rocking wing, a first rocking cover and a handle which are sequentially connected through creases. The structures of the front side plate and the rear side plate are in mirror symmetry, and each of the front side plate and the rear side plate comprises a second rocking wing and a second rocking cover which are connected through creases; first inserting tongues are arranged on the two sides of the first rocking wing respectively, inserting seams matched with the first inserting tongues in a clamped mode are formed in the second rocking wing, second inserting tongues are arranged on the lifting handle, inserting holes matched with the second inserting tongues in a clamped mode are formed in the second rocking cover, and hollow holes are formed in the lifting handle. According to the scheme, glue-free design is adopted, so that the portable box is more environment-friendly, and food in the portable box is not easy to pollute. And moreover, the integral structure adopts an integral design, so that the folding is convenient, and the bearing capacity of the integral structure is greatly improved.

The application discloses a glue-free adhering heterogeneous material and a preparation method thereof. The glue-free adhering heterogeneous material comprises a first heterogeneous material, a second heterogeneous material and a binding material, and various materials are connected through glue-free adhering. The preparation method comprises the following steps: conveying and extruding the first heterogeneous material, the second heterogeneous material and the first surface and the second surface of the binding material through a pressing equipment, so that the first heterogeneous material, the binding material and the second heterogeneous material are combined, and the first heterogeneous material, the binding material and the second heterogeneous material are connected and adhered through the foaming force generated by foaming physical and / or chemical reaction. The glue-free adhering technology is adopted, so that the environmental protection problem is solved, and the application approach of the product is improved.

The invention discloses a lace film and a production process thereof, and belongs to the technical field of film preparation, the film is composed of a bionic skin feeling functional layer, a gradient foaming layer and an enhanced substrate layer which are compounded in sequence, and the surface of the film is provided with a laser-engraved bionic lace line micropore array. The bionic skin feeling functional layer contains castor oil-based TPU (Thermoplastic Polyurethane), organic silicon microspheres and plant polypeptide; the cell density of the gradient foaming layer is gradually increased from outside to inside, and the gradient foaming layer contains a nano photocatalyst; and the reinforced substrate layer is polyester fiber fish scale cloth treated by nitrogen / helium plasma. The preparation method comprises the steps of material banburying, supercritical CO2 injection and gradient foaming, fish scale cloth plasma treatment, hot-pressing compounding, femtosecond laser engraving and constant-tension rolling. A bio-based material is used for replacing traditional PVC, the problems of environmental protection risk, high energy consumption and cleaning of a plasticizer are solved through low-temperature foaming, glue-free compounding and precise carving, the product has degradability, leather-like touch feeling and a self-cleaning function, and the performance and environmental protection performance are remarkably improved.

The invention discloses a two-phase flow vacuum sealing structure, a preparation method and application in the field of two-phase flow heat dissipation and high airtight packaging, and the two-phase flow vacuum sealing structure comprises two base material layers and a sealing structure layer arranged at the peripheral edge part between the base material layers, a capillary structure layer is arranged in the center of the sealing structure layer and located between the two base material layers, and a blocking layer is arranged between the capillary structure layer and the sealing structure layer. By providing two sealing structure selections of an edge sealing adhesive type and a weldable base material type, a proper sealing mode can be flexibly selected according to different application scenes and material characteristics, and the process adaptability is remarkably improved. An effective sealing solution can be provided for production scenes needing rapid curing and convenient operation and products sensitive to sealants and requiring no-sealant sealing.

The invention relates to the technical field of packaging materials, and discloses a high-barrier long-acting antibacterial composite environment-friendly packaging material and a preparation method thereof, and the high-barrier long-acting antibacterial composite environment-friendly packaging material is formed by compounding an inner-layer film, a middle-layer film and a surface-layer film. The inner-layer film is prepared from low-density polyethylene, metallocene linear low-density polyethylene and the like; the middle-layer film is a reactive compatibilization layer and comprises an ethylene-vinyl alcohol copolymer, polybutylene terephthalate adipate and a styrene glycidyl methacrylate copolymer, and compatibility and toughness are improved through an in-situ reaction; a surface film is a functional layer, phytic acid and bifunctional modified montmorillonite are utilized to construct a hybrid network, and the sedum sarmentosum extract and the chitosan quaternary ammonium salt are anchored. By adopting a step-by-step film preparation and hot-pressing compounding process, the obtained material has the characteristics of high barrier, high strength and long-acting bacteriostasis, and the glue-free compounding process is environment-friendly and safe.

The utility model discloses a rubber-free spring mattress, which belongs to the technical field of mattresses and comprises an elastic layer and a connecting layer, the elastic layer comprises buffer springs and linen, the buffer springs are arranged in the linen in an array manner, the connecting layer is positioned above the elastic layer, mounting grooves are uniformly formed in the upper end of the periphery of the connecting layer, and the mounting grooves are communicated with the connecting layer. Connecting holes are formed in the two sides of the lower end of the interior of the mounting groove and are through holes, connecting hooks are mounted on the periphery of the connecting layer and penetrate through the linen to be clamped to one side of the buffer spring, limiting protrusions are evenly arranged at the lower end of the connecting layer, and a comfortable layer is fixedly mounted at the upper end of the connecting layer; the connecting piece can be installed on the elastic layer through the connecting hook piece, so that use of glue is reduced, the situation that formaldehyde is generated by the glue and influences health of a user is avoided, meanwhile, movement of the connecting layer can be reduced through the limiting protrusions, and the connecting layer and the comfortable layer can be detached through connection of the connecting hook piece; and a user can conveniently clean and overhaul the elastic layer.

The invention relates to a rod-shaped multi-segment article (32) and to a method and a machine (2) for producing such a multi-segment article (32). The article has at least two rod-shaped segments (34), preferably three, four, five or more rod-shaped segments, which are arranged adjacently to one another and the exterior (36) of which is surrounded by a covering material (38) at least in some areas. The covering material (38) has at least one continuous glue-free region (50) which at least partly surrounds the mutually facing segment edges (52) of the adjacent segments (34) and preferably connects the segments (34) to one another.

This invention provides a method for producing glue-free and formaldehyde-free particleboard, belonging to the field of particleboard technology. This invention uses bamboo willow branches, *Ligustrum lucidum* branches, dried leaves, and *Eucommia ulmoides* waste as raw materials after chipping. No adhesives are needed. Through practice, it has been found that *Ligustrum lucidum*, also known as "sheep's milk strip," contains rubber components in its stems and leaves. Sulfur water-dispersible granules, originally used for antibacterial and insecticidal purposes, undergo a vulcanization cross-linking reaction with the rubber components in the *Ligustrum lucidum* branches and dried leaves during continuous hot pressing of the layered particleboard blanks. Furthermore, some rubber components remain in the *Eucommia ulmoides* waste. This vulcanization cross-linking reaction creates a tightly connected cross-linked network between the raw materials, acting as an adhesive for the particleboard. This method not only reduces energy consumption but also facilitates processing, reduces production costs, and provides excellent performance, completely eliminating pollution sources at a low cost.

The present invention discloses an airbag massage comb, which includes a comb back, an airbag cover, comb teeth and an elastic member. The comb teeth are installed on the airbag cover. The front surface of the comb back has a pressing edge formed by bending inward. The airbag cover is installed on the front surface of the comb back and arches upward to form an airbag cavity with the comb back. The elastic member is located in the airbag cavity and has an elastic force to press the edge of the airbag cover against the bottom of the pressing edge. In the present invention, the airbag cover of the comb is connected to the comb back in a glue-free and detachable manner, which can ensure that the processing environment of the comb is not polluted by glue, avoid the harm of glue to the operators, and prevent the hardening and cracking phenomena caused by the contact between the airbag cover and the glue, improve the service life of the airbag cover, and is conducive to the disassembly of the airbag cover, facilitating the later replacement and maintenance.

The utility model relates to wet tissue packing technical field discloses a wet tissue cover and wet tissue packing, the upper cover of wet tissue cover is provided with the annular buckle of the lateral clamping of outer cover, the center is provided with the silica gel sealing plug of corresponding cooperation with the extraction mouth, the outer cover and inner cover center are provided with the extraction mouth, and the outer cover and inner cover are connected through the convex platform and the groove structure of mutual embedding and are buckled, the convex platform and the groove structure of mutual embedding include the first convex platform and the second convex platform of setting at the bottom surface of outer cover / the top surface of inner cover, the top surface of inner cover / the bottom surface of outer cover is provided with the first groove and the second groove of mutually corresponding embedding with the first convex platform and the second convex platform, the bag body of wet tissue packing is pressed and arranged in the first groove and / or the second groove with the first convex platform and / or the second convex platform, realizes reliable connection between bag body and wet tissue cover, realizes sealing, prevents the bag body from loosening, discards traditional glue sticking and label sealing mode, realizes glueless sealing and installation, is favorable for long -term stable sealing, has the characteristics such as simple structure, strong practicality, good use effect.

The invention relates to the technical field of composite materials, in particular to a production method of a glue-free bamboo fiberboard, which comprises a process of carrying out bio-enzyme pretreatment on bamboo fibers, and the process of bio-enzyme pretreatment comprises the following steps: step 1, mixing the bamboo fibers and a buffer solution with the pH value of 4.0-4.5 and the temperature of 45-50 DEG C in a container, putting a first magnetizing enzyme into the container, treating for 1.0-1.5 hours, and recovering the first magnetizing enzyme in a magnetic adsorption manner after the treatment in the step 1 is finished; step 2, putting a second magnetizing enzyme into the container, treating for 1.5-2.0 hours, and recovering the second magnetizing enzyme in a magnetic adsorption manner after the treatment in the step 2 is finished; step 3, reducing the temperature of the buffer solution to 30-35 DEG C, then putting a third magnetizing enzyme into the container, treating for 1.0-1.5 hours, and recovering the third magnetizing enzyme in a magnetic adsorption manner after the treatment in the step 3 is finished; and 4, the pretreated bamboo fibers are taken out, cleaned and dried.

The manufacturing process comprises the following steps: providing a first PET (Polyethylene Terephthalate) layer, a second PET layer and an active carbon resin layer between the first PET layer and the second PET layer; sequentially puncturing the three layers by adopting a special needle with barbs; the first silk thread is hooked out of the first PET layer through needle movement, and the second silk thread is hooked out of the second PET layer; the two silk threads are entangled in the activated carbon resin layer; and glue-free connection is formed through multi-point repetition. The process does not need an adhesive, is environment-friendly and efficient, is firm in fiber bridging, and is suitable for an air purification material.

The utility model relates to the field of hygienic product packaging bags, in particular to an anti-explosion packaging bag which comprises a bag body, a ventilation structure is arranged on the upper portion of the bag body, the ventilation structure is a ventilation opening reserved in a hot pressing line on the top of the bag body, and the ventilation opening is formed in the overlapping position of a front bag face, a rear bag face and side bag faces of the bag body. Or the ventilation structure is a glue-free seam arranged on a label used for sealing the object taking opening of the bag body, and the label can be communicated with the object taking opening through the glue-free seam after sealing the object taking opening. The packaging bag can effectively ventilate, prevent bag explosion and effectively prevent dust from entering the bag, and solves the problem that in the prior art, due to the structure that a plurality of air holes are formed, the structural strength of a sealing opening of the packaging bag is reduced.

The invention relates to the technical field of thermal insulation materials, and discloses an aerogel thermal insulation composite board aerogel felt building material which comprises a thermal insulation layer, a first panel is fixed to at least one face of the thermal insulation layer, a tie line is arranged between the first panel and the thermal insulation layer, and non-gel mechanical connection is achieved through penetrating and anchoring of the tie line. According to the heat preservation layer, multiple layers of aerogel materials are sewn into a whole through sewing threads, so that use of organic adhesives is greatly reduced, release of harmful substances such as formaldehyde is avoided, and then the indoor air quality is guaranteed; the tie lines form three-dimensional mechanical occlusion, so that the surface bonding problem of the aerogel is solved, and the interlayer shear strength and the peel strength are improved; the stitched structure inhibits powder falling of the material, maintains low heat-conducting property and environmental friendliness, and is suitable for green and healthy buildings.

The invention belongs to the technical field of windproof and moisture permeable composite fabrics, and particularly discloses a fluoride-free, glue-free and solvent-free film, a double-layer composite fabric and a preparation method thereof, the film comprises the following components by mass: 58-74% of a polyurethane elastomer TPU, 7-11% of a polyester elastomer TPEE, 12-22% of vulcanized silicone rubber micro powder, 2-8% of silica aerogel powder, and 1-5% of an ultraviolet light absorber. The double-layer composite fabric comprises a fabric body and the thin film, and the thin film and the fabric body are compounded through an infiltration method. According to the fluorine-free, glue-free and solvent-free film, the double-layer composite fabric and the preparation method of the double-layer composite fabric, a novel fluorine-free and glue-free fabric and film infiltration type composite technology is achieved, the fabric waterproof treatment procedure is omitted, and the fluorine-free, glue-free and solvent-free film and the preparation method of the double-layer composite fabric are lower in carbon, environmentally friendly and resistant to wind and water and high in breathability and moisture permeability.

The invention discloses a method for preparing a non-glue self-bonding lightweight high-strength intelligent stealth structural material, comprising: using multi-walled carbon nanotubes as a shaping plate, spraying out electromagnetic shielding material polyetheretherketone using electrospinning technology, stretching the polyetheretherketone into a mesh structure, and then adding a mixture of multi-walled carbon nanotubes and powdered sugar into a mesh polyetheretherketone mold, and then subjecting the mold to heat preservation and curing treatment to solidify the mixture of multi-walled carbon nanotubes, powdered sugar and polyetheretherketone in the mold. Since polyetheretherketone has a good electromagnetic shielding effect, and the polyetheretherketone of the invention is arranged in a mesh structure, it has good air permeability, thereby producing a strong heat dissipation effect, and since the multi-walled carbon nanotubes have good thermal conductivity, the two mixtures have good electromagnetic shielding performance, thereby achieving a good stealth effect, and the mixture has good heat dissipation performance.

The invention relates to a device (2) comprising two elements (4, 6) and a hinge (8), the hinge (8) connecting the two elements (4, 6) at an axis of rotation (A-A'), each element (4, 6) having a base (10) and a side wall (12) surrounding the base (10), the base (10) and the side wall (12) together defining an internal housing (14), each element (4, 6) having an external surface (15), the device (2) further comprising at least one covering (12A, 12B), the covering (12A, 12B) covering at least the external surface (15) of one of said elements (4, 6) and having at least one edge folded towards the internal housing (14) of said element (4, 6) and arranged within said internal housing (14), the device (2) further comprising at least one frame-forming piece arranged within of one of the elements (4, 6), said part being configured to wedge said at least one edge of the coating (12A, 12B) against the side wall (12) of said element (4,6). Figure from the summary: Fig. 3,

The invention discloses a pressure-sensitive adhesive layer, a polyurethane dressing containing the pressure-sensitive adhesive layer and a preparation method of the pressure-sensitive adhesive layer and belongs to the field of polyurethane dressings, and the overlook plan of the pressure-sensitive adhesive layer comprises a plurality of closed patterns; the edge of the closed pattern is coated with a pressure-sensitive adhesive, and the inner area of the closed pattern is not coated with the pressure-sensitive adhesive. Through the structural design of the pressure-sensitive adhesive layer, a plurality of microstructure units with independent closed patterns form a reasonably distributed non-adhesive area and an adhesive area. When the polyurethane breathable film is applied to the polyurethane dressing, the polyurethane breathable film has proper adhesive force, and meanwhile, the functions of preventing bacterial infection of a wound and reducing the influence of a pressure-sensitive adhesive layer on the breathability and moisture penetrability of the polyurethane breathable film on the whole polyurethane dressing can be remarkably improved, so that the wound rehabilitation rate and the use comfort of a patient are improved, and the application prospect is wide.

The present invention provides a degradable product based on chitin micro-nano fiber membrane and a preparation method thereof, and obtains purified chitin fiber and chitin micro-nano fiber wet membrane; then gelation and step-by-step neutralization treatment are carried out using an alkaline solution under low temperature conditions, or sodium periodate is used for gelation. Chitin micron fibers and chitin nanofibers are extracted from biomass shell raw materials such as shrimp and crab shells through a mechanical graded fiber disintegration process and mixed and interwoven. The chitin nanofibers strengthen the bonding force between the chitin micron fiber networks, and construct a stable three-dimensional ultrafine multi-level hierarchical double network structure through gelation, retaining and enhancing the advantages of the chitin micron fiber network and the chitin nanofiber network, with excellent mechanical properties, good light transmittance, thermal stability, water resistance, etc., and have potential application prospects in the fields of precision optical devices, flexible electronic devices, and high-performance all-biomass "glue-free self-adhesive" degradable packaging.