53results about How to "Has a barrier effect" patented technology

The invention relates to a sepiolite / polyurethane nanocomposite material and a preparation method thereof. The preparation method comprises the following steps: 1, adding 2 to 10 weight percent of sepiolite, 85 to 90 weight percent of deionized water and 4 to 10 weight percent of organic modifier into a reactor, stirring at the temperature of 30 to 100 DEG C for 1 to 4 hours, filtering, washing and airing to prepare organic modified sepiolite; and 2, adding 5 to 10 weight percent of solvent, 1 to 10 weight percent of organic modified sepiolite, 10 to 25 weight percent of diisocyanate and 0 to 4 weight percent of catalyst into the reactor and stirring at the temperature of 100 DEG C for 1 to 5 hours, adding 40 to 55 weight percent of polymer dibasic alcohol and stirring to prepare a polyurethane prepolymer, mixing the polyurethane prepolymer with 3 to 10 weight percent of chain-extending crosslinking agent and 1 to 6 weight percent of aid, pouring, demoulding and re-vulcanizing at the temperature of 60 to 120 DEG C for 10 to 4 hours to prepare the sepiolite / polyurethane nanocomposite material. The product obviously improves the tensile strength on the premise of maintaining the breaking elongation of a polyurethane elastomer, obviously enhances the thermal stability and has wide application range.

The invention belongs to the technical field of functional coatings, and in particular relates to a water-based fireproof and heat-insulating coating for wooden buildings and a preparation method thereof. The water-based fireproof and heat-insulating paint for wooden buildings mainly includes the following raw materials in parts by weight: 25-30 parts of silicon acrylic emulsion, 10-15 parts of ammonium polyphosphate, 6-8 parts of melamine, 3-6 parts of pentaerythritol, and rutile titanium dioxide 10-15 parts, 3-6 parts of hollow glass microspheres, 2-5 parts of sericite, 2.5-6 parts of hollow ceramic microspheres, 2-4 parts of nano far-infrared ceramic powder, 4-7 parts of diatomaceous earth, water-based enhancer 0.5-1 part of thickener, 0.2-0.4 part of water-based defoamer, 0.4-0.8 part of water-based wetting and dispersing agent, 0.1-0.3 part of water-based antifungal agent, 1-2 parts of film-forming aid, 20-30 parts of deionized water share. The method of the invention is simple, and the prepared coating is fireproof, heat-insulating, mildew-proof, high in adhesion, good in aging resistance, widely used and environmentally friendly, and can be used in wooden buildings for flame-retardant, reducing the temperature rise caused by strong sunlight radiation, and preventing indoor The heat is lost to the outside and other aspects have achieved beneficial effects, effectively protecting the building and saving energy.

The invention discloses a military puncture-proof, tear-resistant, anti-static and high-barrier camouflage painting composite which sequentially comprises a nylon camouflage cloth camouflage layer, a high-barrier layer taking aluminum foil as a substrate, and a heat sealing layer of a polyurethane elastomer film from the outside in. A preparation method of the composite comprises the steps of A preparing the high-barrier layer, and compositing polyethylene glycol terephthalate film and a polyamide film on the upper and the lower surfaces of the substrate, namely the aluminum foil, B compositing the upper surface of the high-barrier layer with a camouflage layer and curing, C compositing the lower surface of the high-barrier layer with the heat sealing layer of the thermoplastic polyurethane elastomer film and curing, and D coating the internal surface of the heat sealing layer with an antistatic agent, and obtaining the camouflage composite. According to the composite and the method, with the adoption of specific compositing and curing processes, the prepared camouflage composite has puncture-proof, tear-resistant, anti-static and high-barrier functions and the like, a protection envelope prepared by the material can effectively prevent army materials from being damp during long-term field storage and transportation, and the storage and transportation quality of the materials is improved.

A gauze mask is prepared by weave or nonwoven material which can adapt to conformation features of faces, which is provided with a nasal dent, or a nose positioning space, an extended chin space, and an area which is closely attached to face, the invention can be used in a medical environment, or general public. The gauze mask can reach stabilization and closely match with faces through a holding band whose positioning has a little elasticity, an upper band is located on a position from the upper nose portion to the top portion of an ear, a lower band is located on a position from a middle point of the gauze mask to the lower portion of an ear, and the band forms a ring which surrounds ears. Each force and each vector of the whole gauze mask are directed to the periphery of a balanced point of the gauze mask, and any movements on a direction of the gauze mask can be totally offset by each force on other directions. In addition, the gauze mask can inhibit and kill nanometer technology antibacterial component through combing, which can prevent a wearer from contacting pollen and the similar allergens, and provide a protection which avoids cross contamination and affection.

The invention discloses a water-based thermal insulation coating, which is characterized by mainly comprising the following components in percentage by weight: 13 to 20 percent of rutile type titanium dioxide, 7 to 12 percent of hollow glass bead, 5 to 10 percent of mica powder, 28 to 36 percent of crylic acid emulsion, 0.1 to 0.2 percent of water-based preservative, 0.2 to 0.6 percent of water-based thickener, 0.1 to 0.3 percent of water-based wetting agent, 0.3 to 0.6 percent of water-based dispersant, 0.1 to 0.5 percent of water-based defoaming agent, 0.1 to 0.3 percent of water-based mildew preventive, 0.2 to 0.3 percent of water-based levelling agent, 4 to 8 percent of water-based aluminum paste and the balance of clear water. The water-based thermal insulation coating integrates three functions, namely blocking, reflecting and radiating functions, can reduce or prevent temperature rise caused by intense radiation of sunlight, and can effectively reduce the temperature in a building on the waterproof basis so as to save energy and improve living and working environments.

The invention discloses an anticorrosion material of a coal-fired power plant chimney and a preparation method thereof. The anticorrosion material comprises a base coating, a middle coating and a top coating, wherein the base coating comprises a component A, a component B and a component C in a mass ratio of 100:(20-35):(0.25-0.3); the middle coating comprises a component D, the component B and a component E in a mass ratio of 100:(20-40):(20-40); the top coating comprises the component D, the component B and a component F in a mass ratio of 100:(20-35):(60-90); the component A comprises 60-98 parts of furan modified epoxy resin, 0.1-0.3 part of antifoaming agent and 1-3 parts of organic solvent; the component B comprises 20-35 parts of modified aromatic amine curing agent; the component C comprises 0.1-0.5 part of coupling agent; the component D comprises the component A, 20-40 parts of glass flake, 5-10 parts of pigment filler and 0.1-0.5 part of anti-settling agent; the component E comprises 20-35 parts of glass fiber; and the component F comprises 50-100 parts of anti-acid wear-resistant filler. The anticorrosion material has the advantages of permeation resistance, corrosion resistance, high bonding strength and high-temperature impact resistance and can realize a long-term efficient protection effect on a desulfurization chimney.

The invention discloses anti-aging functionalized montmorillonite modified asphalt and a preparation method thereof. The preparation method comprises the following steps: (1) modifying montmorilloniteby dopamine to obtain multifunctional dopamine montmorillonite (PMMT); and (2) adding PMMT into the molten asphalt or polymer modified asphalt for shearing and development to prepare the PMMT modified asphalt with high efficiency and aging resistance; (3) carrying out different aging treatments on the asphalt. Compared with styrene-butadiene-styrene block copolymer (SBS) modified asphalt, the styrene-butadiene-styrene block copolymer (SBS) modified asphalt has the advantages that the toughness is high; the viscosity aging index (VAI) of the PMMT / SBS modified asphalt at 135 DEG C can be reduced by 50%, wherein the reduction amplitude of the track factor aging index (RAI) can reach 31% and is higher than the aging index ratio of the SBS modified asphalt to the organic montmorillonite (OMMT) / SBS modified asphalt, and the PMMT modified asphalt shows excellent rheological property and aging resistance.

The invention relates to a filling stent material containing a three-layer structure and suitable for bone repairing and a preparation method of the filling stent material. The bottom end of a bone repairing stent has a multi-stage pore structure with high porosity, can slowly release bioactive factors and improve the inflammatory state of a bone lesion portion, has good biological activity and bone induction ability, and is beneficial to enhancing osteogenesis and bone remodelling; and an upper end is a bone cement matrix barrier layer with low porosity, and a middle layer is an adhesive layer. The composite stent provided by the invention utilizes a barrier effect of an upper layer and an osteogenesis promoting effect of a lower layer, and can effectively promote repairing and regeneration of bone tissues; and besides good adhesion and filling effects, the filling gel auxiliary material also has a bone growth promoting component, and has a synergistic effect with a skeleton.

The invention relates to a stop valve which comprises a valve body and a valve cover. An inlet runner and an outlet runner are arranged in the valve body. A division plate is arranged between the inlet runner and the outlet runner. A valve seat is arranged on the side, located on the inlet runner, in the valve body. The stop valve further comprises a clearing mechanism and a protection plate cleaning part. The clearing mechanism is connected with the valve body, and media deposited on the surface of the valve seat can be cleaned away. The clearing mechanism comprises a protection plate, a connecting plate and a hinged part. Through ascending and descending of a valve clack, the protection plate can be controlled to clear the sealing face of the valve seat, and the protection plate cleaningpart can clean the protection plate. The stop valve has the advantages that through the arrangement of the clearing mechanism and the protection plate cleaning part, the clearing mechanism can be used for clearing the valve seat and can be cleared, and therefore the sealing effect of the valve clack and the valve seat is guaranteed, and maintenance cost is reduced.

The invention discloses a gas-releasing-type composite preservative pasting film. The gas-releasing-type composite preservative pasting film comprises a pasting film body and an adhesive sticker layer, wherein the adhesive sticker layer is arranged on the pasting film body. The pasting film body is of a layer structure and comprises a porous releasing film, a composite preserving coating, a silica gel coating, a macromolecule water absorption layer, an adhesive layer and an isolation layer in sequence from bottom to top, and the adhesive sticker layer comprises an adhesive sticker coating, wherein the adhesive sticker coating is arranged on the isolation layer. Sterilizing gas released by the preservative film has adjustability, the releasing period of the sterilizing gas is long, and the sterilizing gas is not left on the surfaces of food materials.

The invention provides cellulose-based fluoride-free hot-oil-proof packaging paper. The cellulose-based fluoride-free hot-oil-proof packaging paper is prepared by coating paper with a coating, whereinthe coating comprises the components in parts by weight: 2 to 5 parts by weight of a cellulose nano-fibril suspension, 1 part by weight of nano-clay, 0.5 to 1.5 parts by weight of a soybean protein adhesive and 93.5 to 96.5 parts by weight of distilled water; the coating amount of the coating is 1-5 g / m< 2>; the paper is made of heat-resistant modified fibers. The packaging paper obtained by coating heat-resistant modified paper with the coating containing the cellulose nanofibrils, the nano-clay and the soybean protein adhesive, due to the fact that the used materials are easy to degrade anddo not contain fluorine, pollution caused by fluorine-containing products is effectively avoided, and the ecological environment pressure is reduced. The nano-clay is small in particle size and largein surface area and is tightly combined with the cellulose nanofibrils, and a continuous and compact silicon-containing ceramic carbon layer is formed on the surface of the paper, so that a blockingeffect on hot oil transfer is achieved, and the hot oil prevention effect of the heat-resistant modified paper is improved.

The invention relates to a high-elastic barrier foam and a preparation method thereof. The high-elastic barrier foam comprises a base layer, a barrier layer and a reinforcing layer which are thermallyfused into a whole in sequence, wherein the base layer is prepared from, by weight, 85 to 95 parts of polyether polyol, 20 to 35 parts of diphenylmethane diisocyanate, 1 to 2 parts of a foaming agent, 0.2 to 0.7 part of a catalyst, 3 to 5 parts of a flame retardant, 3 to 5 parts of a waterproof agent and 1 to 6 parts of silicone oil, and the hydroxyl value of the polyether polyol is 75 to 135; the barrier layer is prepared from, by weight, 30 to 45 parts of EVA, 4 to 6 parts of talcum powder, 6 to 8 parts of lime powder, 10 to 20 parts of triethyl phosphate, 32 to 42 parts of epoxy modified organosilicone resin powder, 10 to 12 parts of a styrene-acrylic emulsion and 0.3 to 1 part of a sodium polycarboxylate dispersing agent; and the reinforcing layer comprises, by weight, 90 to 95 partsof polyurethane and 5 to 10 parts of magnesium hydroxide. The tensile strength, the elongation at break, the tearing strength and other properties of the foam are remarkably improved, and meanwhile, the foam has a certain barrier effect, so that the application range of the foam is expanded, and the product performance is improved.

The invention provides a polyaniline / MOF composite coating electrode material and a preparation method and application thereof. The coating electrode material is formed by combining a component A, a component B and a component C according to the mass ratio of m(component A) to m (component B) to m(component C) being (1.5-2.5):(1-5):(800-1200). The component A is polyaniline (PANI), the component Bis an MOF structural material (Co / Co4N-N), and the component C is epoxy resin. According to the preparation method, the polyaniline material is modified by doping the MOF structure material, so thatthe electrochemical performance of the polyaniline material is improved, and then the epoxy resin base material is modified by utilizing the modified polyaniline material. The Q235 steel is taken as aresearch object, so that the corrosion protection performance of the epoxy resin base material is improved, and the corrosion resistance of the Q235 steel in a corrosion environment is effectively improved. A process route achieving the best performance is obtained by carrying out experimental exploration on a key material part.

The invention relates to a preparation method for modified polyester, and comprises the following steps: dibasic acid and dibasic alcohol are prepared into sizing material according to the mol ratio of 1:1.6 to 1, the sizing material is added into a reaction vessel after being stirred uniformly to perform the esterification reaction, and low molecular polymer is obtained through the reaction; the esterification reaction performs the polycondensation reaction, polymer melts are obtained, and through cooling, pelleting, and drying, polyester pellets are obtained; 2,6-naphthalenedicarboxylic acyl chloride or 2,6-dihydroxynaphthalene is added in the stage of the esterification reaction, the monomer participates in the whole reaction process, partial monomer units are directly coupled in the macromolecular chain segment, and catalyst, phosphorus heat stabilizer, and toner are added in the esterification or polycondensation stage. The polyester prepared through the invention can obstruct ultraviolet light with the wavelength below 360 nm, the polyester product is non toxic, the chemical stability is good, the manufactured product transparence is excellent, the ultraviolet leakage does not exist, and the final processing is convenient. A polyester bottle produced with the modified polyester pellets prepared by the invention has obstructing effect to the ultraviolet.

The invention discloses a foldable wardrobe with an airing function. The wardrobe includes first supporting rods, clapboards, airing rods and water accumulation rods; mounting drums are installed at the tail ends of the first supporting rods, the clapboards are fixedly bonded to the inner wall of a baseplate, and locking grooves are fixedly welded to the inner walls of the first supporting rods; the tops of the airing rods and water accumulation rods are fixedly welded to the inner walls of locking blocks respectively; mounting blocks are fixedly welded to the inner walls of second supportingrods, rotating shafts are installed on the surfaces of the first, second and third supporting rods respectively, and attracting magnets are installed on the inner walls of door plates. According to the foldable wardrobe with the airing function, the mounting drums are in threaded connection with the first supporting rods, the second supporting rods and the third supporting rods separately, and convenience is provided for users to dismantle the first supporting rods, the second supporting rods, the third supporting rods and the mounting drums. Moreover, convenience is provided for the users tofold and convey the wardrobe.

The invention discloses a soundproof door. The soundproof door comprises a frame and door panels, a mounting groove matched with the door panels is formed in the frame, two door panels are arranged, the two door panels are rotatably connected with the frame, the opening directions of the two door panels face the outer side of the frame, the opening rotation directions of the two door panels are the same, the frame is integrally formed, and an air pipe communicated with the outside is arranged above the middle of the frame. When one door panel is closed and then the other door panel is closed,gas between the two door panels is compressed, and the gas flows to the outside through the air pipe; since both the door panels are in the closed state, the overall sound insulation effect of the soundproof door is improved.

The invention relates to an electric stimulation antibiosis dressing device which comprises a dressing film (1), a pair of insulation clamping pieces (2) arranged oppositely, conducting clamping pieces (3) arranged on the insulation clamping pieces (2) respectively, a button cell (4), lead wires (5), a lining plate (6) which is arranged between the insulation clamping pieces (2) and are connected with the insulation clamping pieces (2) and an outer shell (7). The dressing film (1) is fixed by the insulation clamping pieces (2) and the conducting clamping pieces (3), one face of the dressing film (1) is in contact with the lining plate (6), and the other face of the dressing film (1) is in contact with a skin wound surface. The conducting clamping pieces (3) placed at the two ends of the lining plate (6) are in contact with the front face and the back face of the dressing film (1) respectively in a fixing mode. The conducting clamping pieces (3) are connected with a positive electrode and a negative electrode of the button cell (4) through the lead wires (5). The button cell (4) is fixed on the lining plate (6) and is covered by the outer shell (7). The electric stimulation antibiosis dressing device is simple in design and convenient to operate, the wound surface is subjected to contact treatment, bacterial biofilm forming can be effectively avoided, and wound healing is promoted.

The invention discloses modified glass bead thermal insulation mortar and a preparation method thereof and belongs to the technical field of building materials. The mortar is prepared from 30-50 partsof portland cement, 5-10 parts of quartz sand, 10-15 parts of kaolin, 20-30 parts of hollow glass beads, 2-3 parts of inorganic mineral powder, 2-3 parts of styrene acrylic emulsion, 4-6 parts of hydroxypropyl methyl cellulose, 3-5 parts of polypropylene short fibers, 3-5 parts of polyvinyl alcohol and 3-5 parts of mono potassium phosphate. According to the modified glass bead thermal insulationmortar, after the glass beads are modified, film with high adhesive strength is formed on the surfaces of the hollow glass beads and has the effects of blocking the hollow glass beads and sealing theincomplete glass beads, the smashing rate of the glass beads is lowered, and accordingly the water absorption rate is lowered. Meanwhile, the polymer film on the surfaces of the hollow glass beads hascertain strength and toughness and has the effect of strengthening the hollow glass beads.

The invention relates to a nine-head energy-saving burner. The nine-head energy-saving burner is consisted of nine burning heads in a square arrangement mode, and is used for mounting and manufacturing an energy-saving stove or a gas stove. The invention belongs to the technical field of kitchen appliance design and manufacturing. According to the nine-head energy-saving burner, gas can be provided with sufficient atomization time and space before combustion, and the gas can be mixed with oxygen before combustion so as to be fully burned when the gas is in contact with cookers, and the gas canbe reasonably used according to cooking or cooking food demands.

The invention relates to a cable material, in particular to a halogen-free flame-retardant thermoplastic elastomer cable material for new energy vehicles. The halogen-free flame-retardant thermoplastic elastomer cable material for new energy vehicles is made from, by weight, 25-45 parts of thermoplastic elastomer, 10-40 parts of polyolefins, 5-25 parts of polypropylene ether, 0.1-5 parts of a halogen-free flame retardant, 1-5 parts of a compatibilizer, 0.1-5 parts of an antioxidant, and 5-10 parts of filling oil. The halogen-free flame-retardant thermoplastic elastomer cable material for new energy vehicles has the properties of environmental friendliness and safety, flame retardance and fire resistance, low smoke, aging resistance and the like, and can meet people's daily needs.

The invention relates to the technical field of fast food processing, in particular to a full-automatic cooking robot and a use method thereof. The robot comprises an equipment base, an automatic feeding box is arranged on one side of the equipment base, a main body bearing box is arranged on the other side of the equipment base, a transmission mechanism and a liquid feeding mechanism are arranged in the main body bearing box, a heating pot body is connected between the automatic feeding box and the main body bearing box, a supporting plate is arranged on the upper end face of the equipment base, a rotating motor is arranged on the upper end face of the supporting plate and located over an opening of the heating pot body, a first electric telescopic rod is connected to the lower portion of the rotating motor, and stirring arms are connected to the lower portions of the two sides of the first electric telescopic rod; and supporting mechanisms are arranged below the equipment base, the automatic feeding box and the main body bearing box, and a touch control operation panel is fixedly arranged on one side of the upper end face of the main body bearing box. The robot has the automatic processing effect of dishes, and meanwhile, the dishes in the heating pot body can be stirred more uniformly by utilizing the special stirring arms.

The invention relates to ocular implantation gel containing ciclosporin and its preparation method and application. The gel is characterized in that ciclosporin disperses in cross linked hyaluronic acid gel, and the weight ratio of cross linked hyaluronic acid and ciclosporin is 1:5-5:1.The preparation method of the gel comprises suspending ciclosporin in sodium hyaluronateaqueous solution, mixing with cross-linking agent for reaction to form gel, purifying, cutting, packaging, and sterilizing to obtain final product. The gel can be be used for preparation of ocular drug implants for preventing adhesion of humor aquosus through filtering channel in non penetrable joist operation of glaucoma, improving filterability and keeping filtering channel, controlling intraocular pressure after operation, preventing rejection reaction after corneal transplantation and some ocular autoimmune disease.

The invention relates to the field of municipal engineering, in particular to an environment-friendly and breathable tree pool. The environment-friendly and breathable tree pool comprises a fence structure located around a tree and a pebble layer located inside the fence structure and laid above planting soil of the tree, wherein the pebble layer is laid above the planting soil to prevent wind andsand blowing; the pebble layer comprises a plurality of pebbles coated with epoxy resin glue on the surface, and gaps are left between the pebbles to ensure air permeability and water permeability; and the pebble layer has a blocking effect on sunlight and can reduce water evaporation in the tree pool, and in addition, the particle size of the pebbles is 20-50 mm.

The invention discloses a local surface plasma resonant sensor and fabrication method and application thereof. The sensor comprises a transparent dielectric layer and silver films, wherein the transparent dielectric layer is obtained by preparation of a polycarbonate material and comprises a substrate and a nanometer column array, the nanometer column array is arranged on the substrate, the shapesand the cross sections of the top and the bottom of each nanometer column in the nanometer column array are same, the cross section area of the top of the nanometer column is larger than the cross section area of a middle part of the nanometer column, the bottom of the nanometer column is connected with the substrate, the silver films cover the top and the bottom of the nanometer column, gaps areformed between the silver film covering the substrate and the nanometer columns, and SiO2 / TiO2 composite coating layers are further coated on surfaces of the nanometer columns. The sensor is high insensitivity and accuracy and long in service lifetime and has favorable application prospect in the field of biochemical detection.

The invention discloses a protective isolation garment for medical rescue. The protective isolation garment comprises a protective isolation garment body composed of an upper garment, a pair of trousers, a head mask and gloves, which are integrally connected; a zipper for put-on and take-off is arranged on the protective isolation garment body; a top fly used for shielding the zipper is arranged outside the zipper; the front portion of the head mask is provided with an opening; the lower half section of the opening is connected with a mouth mask through a bonding buckle; the protective isolation garment body, the top fly and the mouth mask are all made of a composite non-woven fabric; the composite non-woven fabric comprises a thermoplastic elastomer base layer; and the upper surface of the thermoplastic elastomer base layer is connected with a polyamide non-woven fabric surface layer through an adhesive layer. Through the protective isolation garment body consisting of the upper garment, the trousers, the head mask and the gloves, which are integrated, and the mouth mask, rescue personnel can be effectively protected and isolated; and the thermoplastic elastomer base layer of thefabric of the protective isolation garment body has the advantages of rubber and plastics, and has good isolation and protection effects on dangerous blood.

The invention discloses a preparation method of a polymer-based antifouling coating based on a thermal spraying technology. The preparation method comprises the following steps: (1) carrying out surface roughening treatment on a substrate; (2) preparing a polymer-capsaicin coating on the roughened surface of a matrix by using a thermal spraying technology; and (3) remelting the polymer-capsaicin coating, and cooling to obtain the polymer-based antifouling coating based on the thermal spraying technology. The preparation method is simple, raw materials are easy to obtain, controllability is good, large-scale production is facilitated, the prepared polymer-based antifouling coating based on the thermal spraying technology is high in binding force with the matrix, the antifouling coating combines the advantages of a polymer material and the antifouling characteristic of capsaicin, the capsaicin is dispersed in the coating, and the coating has excellent antibacterial effect, anti-algae performance and antifouling effect, and has a wide application prospect in the field of marine antifouling.

The invention relates to a preparation method of a rubber modified additive. The preparation method comprises the following steps: (1) crushing attapulgite and processing the same for later use; (2) treating the attapulgite powder with a zinc sulfate solution; and (3) carrying out nanometer compound modification on the attapulgite. According to the additive provided by the invention, based on theattapulgite as the primary raw material, the production cost of rubber is lowered, and the wear resistance of the rubber can be enhanced obviously.

A multifunctional electric hoist disclosed in the invention comprises a multifunctional electric hoist body composed of a hoisting mechanism, a reduction gearbox, a lifting hook assembly and a switch controller, the left side of the hoisting mechanism is fixedly connected with the right side of the reduction gearbox, and the top of the lifting hook assembly is fixedly connected with the outer side of the reduction gearbox through a rotating seat; and the switch controller is located on the front side of the reduction gearbox, and the hoisting mechanism comprises a heat dissipation shell. The invention relates to the technical field of electric hoists. The multifunctional electric hoist can effectively solve the technical problems that in some flour processing factories, due to the fact that flour flies along with air and easily enters a hoisting motor, a hoisting motor body can generate a large amount of heat in the working process, the flour enters heat dissipation holes, the heat dissipation effect of the hoisting motor is affected, the service life of the hoisting engine is shortened, the hoisting engine automatically flames out under serious conditions, and potential safety hazards exist in the prior art.

A gauze mask is prepared by weave or nonwoven material which can adapt to conformation features of faces, which is provided with a nasal dent, or a nose positioning space, an extended chin space, and an area which is closely attached to face, the invention can be used in a medical environment, or general public. The gauze mask can reach stabilization and closely match with faces through a holdingband whose positioning has a little elasticity, an upper band is located on a position from the upper nose portion to the top portion of an ear, a lower band is located on a position from a middle point of the gauze mask to the lower portion of an ear, and the band forms a ring which surrounds ears. Each force and each vector of the whole gauze mask are directed to the periphery of a balanced point of the gauze mask, and any movements on a direction of the gauze mask can be totally offset by each force on other directions. In addition, the gauze mask can inhibit and kill nanometer technology antibacterial component through combing, which can prevent a wearer from contacting pollen and the similar allergens, and provide a protection which avoids cross contamination and affection.

The invention discloses a disposable safety mask capable of preventing repeated use. The disposable safety mask comprises a first protective layer, a plurality of open holes are formed in one side of the bottom of the front face of one side of the first protective layer, a clamping pipe is fixedly installed in the middle of the top end of the back face of the first protective layer, and two inserting grooves are fixedly formed in the two sides of the inner wall of the first protective layer, the two inserting grooves are connected with one side of the front face of a second protection layer in a clamped mode through inserting rods, and a heat dissipation mechanism is fixedly installed on one side of the interior of the first protection layer. According to the scheme, the protection mechanism is conveniently clamped and fixed through the formed clamping groove, the mounted protection mechanism can be used for blocking the part worn on the mouth and the nose and filtering air entering the mouth and the nose, so that harmful gas, odor and droplets are prevented from entering and exiting the mouth and the nose of a wearer, heat dissipation blades are conveniently driven to rotate through rotation of a servo motor, air circulation in the mask is ensured, and the wearing comfort is improved.