20results about How to "Guaranteed barrier properties" patented technology

The invention discloses an anti-freezing PE (polyethylene) film, a composite film of the anti-freezing PE film and a related preparation method, relates to the field of packaging films, and aims to solve the problem of low freezing resistance and puncture resistance in the prior art. Comprising anti-freezing layer components: low-density polyethylene, high-density polyethylene, metallocene linear low-density polyethylene resin, cold-resistant PA66 resin, composite phosphate, olefin block copolymer resin, a modified nanoscale silicon oxide coupling agent and a nanoparticle toughening agent, and barrier layer components: low-density polyethylene, linear low-density polyethylene and high-density polyethylene. The toughening heat-sealing layer comprises the following components: low-density polyethylene, sarin resin, metallocene linear low-density polyethylene resin, EVA (Ethylene Vinyl Acetate) modified bonding resin, a slipping agent, a nanoparticle toughening agent, a modified nanoscale silicon oxide coupling agent, dioctyl adipate and an antioxidant. The composite material can resist-38 DEG C ultra-low temperature freezing, and is puncture-resistant, cold-resistant and excellent in barrier property.

The invention relates to the technical field of biaxially oriented polypropylene films, in particular to a paper-plastic composite biaxially oriented polypropylene film and a preparation method and application thereof.The paper-plastic composite biaxially oriented polypropylene film comprises a coining surface layer, a core layer and a low-melting-point thermal composite layer which are sequentially arranged, and the coining surface layer comprises co-polypropylene and 15-25 wt% of ethylene-norbornene copolymer A; the low-melting-point thermal composite layer comprises 5-10wt% of an ethylene-norbornene copolymer B and an ethylene-vinyl acetate copolymer, and the core layer comprises polypropylene. The paper-plastic composite biaxially oriented polypropylene film disclosed by the invention can meet the requirements of a laser holographic imprinting process of an imprinting surface layer on the premise of not influencing the performance of a low-melting-point thermal compounding layer, can be directly thermally compounded with aluminum-plated card paper without an adhesive layer, is high in compounding strength, has the advantages of energy conservation and environmental protection, and is suitable for popularization and application. And the laser anti-counterfeiting card paper obtained after film covering and aluminum plating is good in barrier property, and the shelf life of packaged contents can be prolonged.

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-barrier composite coating liquid and a preparation method thereof. Aiming at the problems of poor barrier property and limited application scene of a PE (polyethylene) film in the prior art, the invention provides the high-barrier composite coating liquid and the preparation method thereof, and the high-barrier composite coating liquid comprises the following components in parts by mass: 25-35 parts of deionized water, 45-65 parts of low-polymerization-degree PVA (polyvinyl alcohol) emulsion, 10-25 parts of low-polymerization-degree ethylene maleic anhydride homopolymer and 0.5-2 parts of flow improver. The composite coating liquid provided by the invention is coated on the surface of a PE film, so that the problem of poor barrier property of a PE film made of a single material can be effectively solved, and the PE film can partially replace composite films such as PET / PE, PA / PE, KPET / PE or PET / PA / PE of a three-layer structure, BOPP / PA / PE and the like.

The present invention relates to the technical field of fire doors, and specifically to a fire door with a smoke and dust blocking structure, comprising a driving mechanism, a sealing mechanism and a pressing mechanism; the driving mechanism is connected to a door frame; the sealing mechanism is connected to the driving mechanism; the pressing mechanism is connected to the door frame; by designing a sealing strip as a movable structure, the sealing strip shrinks into the door frame when the fire door is opened, and the sealing strip extends and adheres to the door leaf when the fire door is closed to close the door gap, and the sealing end face of the sealing strip does not rub against any structure during the sliding process. When a fire occurs, the sealing strip is further pressed against the door leaf by the high temperature; the problem that the normally closed fire door set in a stairwell with a large flow of people is frequently opened and closed, resulting in the sealing strip being worn during the door opening and closing process and being unable to effectively block smoke is solved.

The invention provides a cold region pile foundation freeze injury protection method which comprises the following steps: stacking a plurality of self-expanding fillers in a pit slot in which a pile foundation is arranged, and covering the pit slot with a soil body after the self-expanding fillers are stacked; each self-expansion filler comprises a flexible fabric bag and a soil body in the bag, the flexible fabric bag is filled with the soil body in the bag, each self-expansion filler comprises a flexible section and a self-expansion section, the placing directions of every two adjacent self-expansion fillers are opposite during filling, water absorption mechanisms are arranged on the inner side and the outer side of each self-expansion section respectively, and a plastic plate is arranged on the inner side of each self-expansion section. When the soil body is frozen, the soil body in the self-expansion filler expands, under the constraint effect of the flexible fabric bag, the expansion has a limit and is mainly subjected to horizontal expansion, under the guidance of the inner side plastic plate, the two self-expansion sections move towards the two sides respectively, and the contact effect between the self-expansion sections and the pile foundation is enhanced. On the premise that side friction resistance is not reduced, inhibition of the pile foundation freezing pulling phenomenon is achieved, and the influence of the extreme environment on the pile foundation operation stability is reduced.

The utility model relates to the field of flexible packaging materials, in particular to a compact composite type high-barrier linear easy-to-tear antibacterial nylon film and a composite film thereof. The tight composite type high-barrier linear easy-to-tear antibacterial nylon sequentially comprises an anti-sticking antibacterial layer, a first linear easy-to-tear nylon layer, a barrier layer, a second linear easy-to-tear nylon layer and a tight composite layer from outside to inside, the composite film sequentially comprises a tight composite type high-barrier linear easy-to-tear antibacterial nylon film layer, an adhesive layer and a heat sealing layer from outside to inside. According to the compact composite type high-barrier linear easy-to-tear antibacterial nylon film, a five-layer composite structure is adopted, various materials are laminated and combined, the advantages of the various materials can be integrated, and the performances are complementary; the composite film comprising the compact composite type high-barrier linear easy-to-tear antibacterial nylon film has good mechanical property, barrier property, antibacterial property, linear easy-to-tear property and excellent composite peel strength, and has a very wide application prospect.

The invention relates to the technical field of degradable high polymer materials and disposable personal care products, and discloses a preparation process of a degradable high-barrier plastic film for a hair dyeing shawl, and the preparation process comprises the following steps: 1, preparing chitosan-dopamine grafted modified montmorillonite (CTS-DA-MMT): dispersing 5g of 20-30nm nano montmorillonite in a 2wt% acetic acid solution, and ultrasonically dispersing for 40 minutes by 200W; adding dopamine hydrochloride according to the ratio of montmorillonite to dopamine being 1: 0.2, adjusting the pH value to 8.5 by using 1mol / L NaOH, and carrying out stirring reaction at room temperature for 1 hour; adding chitosan according to the ratio of montmorillonite to chitosan being 1: 0.4, and stirring and reacting at the constant temperature of 50 DEG C for 3 hours; the pH is adjusted to 7.0 through 1 mol / L HCl, centrifugation is carried out for 15 min at the speed of 8000 r / min, washing is carried out three times through deionized water, vacuum drying is carried out for 8 h at the temperature of 60 DEG C, and the product is obtained. According to the preparation technology of the high-barrier plastic film for the degradable hair dyeing shawl, chemical grafting (instead of physical blending) of montmorillonite-dopamine-chitosan is achieved through catechol groups of dopamine, the problems of montmorillonite agglomeration and matrix compatibility are solved, and the degradable hair dyeing shawl is prepared. Meanwhile, through the dynamic adhesiveness of dopamine, the problem of barrier failure under dynamic stretching is solved.

The application relates to the technical field of packaging materials, and discloses an antistatic aluminum plastic film, a preparation method and application in lithium battery packaging, wherein the antistatic aluminum plastic film is prepared by dry compounding of an outer nylon film, an intermediate aluminum foil layer and an inner polyethylene composite film; the polyethylene composite film is composed of 60-80 wt% of metallocene linear low-density polyethylene resin and 20-40 wt% of carbon black-graphene polyethylene composite masterbatch; the carbon black-graphene hybrid particle contains an alkenyl functional group on the surface, and a free radical addition grafting reaction occurs between the linear low-density polyethylene resin and the carbon black-graphene polyethylene composite masterbatch through the action of an initiator; and the carbon black-graphene hybrid particle is prepared by Schiff base reaction of a dialdehyde alkenyl functional modifier and amino-functionalized carbon black and amino-functionalized reduced graphene oxide. The aluminum plastic film prepared by the application has excellent antistatic performance, heat sealing performance and barrier performance, and is used for packaging of lithium iron phosphate powder which is a positive electrode material of a lithium battery.

The utility model relates to a horizontal explosion-proof battery pack and a vehicle. The horizontal explosion-proof battery pack comprises a box body, the battery pairs are arranged in the box body, each battery pair comprises a first battery assembly and a second battery assembly which are oppositely arranged, and the oppositely arranged side walls of the first battery assembly and the second battery assembly are each provided with an anti-explosion valve used for providing a spray flow path; and the protection part is arranged in the box body and is positioned between the first battery assembly and the second battery assembly, and the protection part comprises a curved surface part facing the first battery assembly corresponding anti-explosion valve and the second battery assembly corresponding anti-explosion valve. And through the protection piece, the fire particles can be prevented from impacting other battery assemblies, so that the probability of overall thermal runaway of the battery pack is reduced. Meanwhile, due to the arrangement of the curved surface part on the protection part, on one hand, the particles with fire are obliquely erupted to the protection part at a certain angle, and on the other hand, the contact area with the particles with fire is increased by the curved surface part, the impact of the particles with fire on the protection part is reduced, and the safety of the battery is effectively improved.

The present invention belongs to the technical field of disposable bioreactor bag preparation, and specifically relates to a method for preparing a high-strength disposable bioreactor bag. The preparation method comprises the following steps: (1) preparing a mixture of modified magnesium borate whiskers, zirconium diboride and cellulose nanofibers; (2) preparing a mixture of modified nano molybdenum disulfide, nano silicon dioxide and nano titanium dioxide; (3) mixing outer layer raw materials; (4) mixing middle layer raw materials; (5) respectively melt-extruding the outer layer raw materials, the middle layer raw materials and the inner layer raw materials, co-extruding and forming, and preparing a composite film composed of an outer layer, a middle layer and an inner layer through heat treatment, and finally processing the composite film into a high-strength disposable bioreactor bag. The preparation method of the high-strength disposable bioreactor bag of the present invention has a simple process, and the performance of the prepared bioreactor bag is stable, so that the bag body of the bioreactor bag can be prevented from rupturing and leakage of the culture medium in the bag during use.

The arc extinguishing system comprises an arc extinguishing chamber, the arc extinguishing chamber is arranged in a shell of the circuit breaker, the shell is provided with an exhaust port, an exhaust channel is connected between the exhaust port and an exhaust end of the arc extinguishing chamber, two ends of the exhaust channel are communicated with the exhaust end and the exhaust port respectively, and the arc extinguishing system further comprises a pressure adjusting part. The pressure adjusting part is rotationally arranged in the exhaust channel and is driven by the air pressure difference between the exhaust channel and the exhaust end, so that the exhaust channel and the exhaust end are communicated or blocked. According to the utility model, through arranging the pressure adjusting member, the pressure adjusting member is driven by air pressure difference, so that the pressure adjusting member is rotated to be opened or the pressure adjusting member is reset to block the communication between the exhaust channel and the exhaust end, thereby preventing back-spraying high-temperature gas from entering the arc extinguish chamber or the circuit breaker from the exhaust channel, improving the product performance and prolonging the service life.

The electronic component includes a green body (20) and a glass film (50) covering an outer surface (21) of the green body (20). The glass film (50) has a groove (52) extending on an outer surface (51) of the glass film (50). The groove (52) is recessed from the outer surface (51) of the glass film (50) toward the outer surface (21) side of the green body (20) in a specific cross-section in a direction orthogonal to the outer surface (51) of the glass film (50). The bottom (52A) of the groove (52) is positioned further toward the outer surface (51) side of the glass film (50) than the outer surface (21) of the green body (20). In addition, the bottom (52A) of the groove (52) in a specific cross section is arc-shaped.

The invention discloses a tunnel smooth blasting construction dust fall device and a using method thereof, relates to the technical field of blasting construction dust fall, and aims to solve the technical problem that the tunnel smooth blasting construction dust fall device is low in dust fall efficiency. The tunnel smooth blasting construction dust fall device comprises a moving mechanism, a dust fall mechanism, an extending mechanism and a reciprocating mechanism. Before smooth blasting of a tunnel, the moving mechanism moves to a proper distance away from the blasting position of the tunnel, the positions of the spraying ends of the spraying assemblies are adjusted through the extending mechanism, the spraying ends are matched with the tunnel in size, and the spraying assemblies spray mist to form a mist wall to block dust which is generated by smooth blasting and is high in diffusion speed; and when the follow-up dust falling volume is reduced and the diffusion speed of tunnel dust is driven to be reduced, the plurality of linkage assemblies of the reciprocating mechanism drive the plurality of spraying assemblies to rotate in a reciprocating manner, so that the plurality of spraying assemblies spray in a swinging manner for dust falling, and the dust falling efficiency is high.

The application discloses a kind of multilayer co-extrusion high-barrier plastic container extrusion forming device and method, it is related to extrusion molding technical field, including support frame, the upper portion of the support frame is provided with forming mechanism, for extrusion molding, the forming mechanism includes: conveying assembly, setting in the upper portion of support frame, for conveying melt;Flow distribution component, including the support ring fixed in the side of conveying assembly, the inside of the support ring is fixedly installed with outer tube, the top of the outer tube is fixedly installed with flow distribution plate, the lower portion of the flow distribution plate is fixedly installed with straight pipe, inner mould adopts the structure that heat conduction cylinder is inlaid capillary tube, capillary tube inside fills heat conduction medium, utilizes capillary effect to realize medium spontaneous microcirculation heat conduction, form even heating uniform temperature effect, simultaneously along heat conduction cylinder vertical equidistance arrangement annular coil is heated independently in section, temperature sensor is detected mould temperature in real time, extrusion molding whole process continues to smooth the temperature difference of each area of mould body, inhibits temperature instantaneous fluctuation.

According to the polyvinyl alcohol and the preparation method thereof provided by the invention, the polyvinyl alcohol is prepared by taking 2-acrylamide-2-methylpropanesulfonic acid and dodecyl vinyl ether as reactive compound emulsifiers, and a hydrophilic sulfonic acid group and a soft-segment long-chain alkyl ether chain can be introduced into a polyvinyl alcohol molecular chain; on the basis of keeping the hydrophilicity, barrier property, biocompatibility and biodegradability of the polyvinyl alcohol, the flexibility and hydrolysis resistance of the polyvinyl alcohol are improved.

The invention discloses a foam material with a thin film layer / foam hole layer alternate multi-layer structure and a preparation method of the foam material. The preparation method comprises the following steps: S1, weighing polystyrene and polymethyl methacrylate; s2, polystyrene and polymethyl methacrylate are prepared into a polymer sheet through multi-layer co-extrusion equipment, the polymer sheet comprises polystyrene layers and polymethyl methacrylate layers which are alternately stacked, the thickness of the polystyrene layers is 5-25 microns, and the thickness of the polymethyl methacrylate layers is 5-25 microns; s3, the polymer sheet is placed in a high-pressure kettle for saturation, after full saturation, a sample is taken out of the high-pressure kettle, foaming is conducted at the foaming temperature, the polystyrene layer forms a foam hole layer, the polymethyl methacrylate layer forms a thin film layer, and the foam material of the thin film layer / foam hole layer alternate multi-layer structure is prepared.

The invention provides a high-barrier moisture-absorption-resistant ethylene-vinyl alcohol copolymer which is composed of the following repetitive units: an ethylene unit, a vinyl alcohol unit and an enediol unit with a general formula structure as shown in a formula I. In the formula I, R is selected from C1-C4 alkylene; the molar ratio of the enediol unit to the vinyl alcohol unit is 1: 1-70, and the molar fraction of the ethylene unit is 20-40 mol% with respect to all repeating units constituting the copolymer. The preparation method comprises the following steps: carrying out a free radical polymerization reaction on a pre-polymerized monomer, vinyl acetate and ethylene under the action of an initiator to obtain a modified EVA elastomer, and then carrying out a saponification reaction. The high-barrier moisture-absorption-resistant ethylene-vinyl alcohol copolymer has excellent barrier property, moisture absorption resistance and mechanical property, halogen is not introduced into the structure, and the high-barrier moisture-absorption-resistant ethylene-vinyl alcohol copolymer is more friendly to human bodies and environment and can be safely used for food and medicine packaging. # imgabs0 #

The application provides an alternator, which comprises a motor shell, a stator assembly arranged in the motor shell, a rotor assembly arranged in the stator assembly and connected with the motor shell, a rectification assembly arranged on one side of the motor shell, a heat dissipation fan arranged on the other side of the motor shell, and a middle shaft for connecting the rectification assembly, the rotor assembly and the heat dissipation fan, characterized in that the motor shell is symmetrically provided with a rear end cover and a front end cover on both sides, respectively, and a belt transmission wheel is fixedly arranged at one end of the middle shaft and extends to the outside of the front end cover. The filter mechanism is arranged, so that the particulate matter is blocked on the surface of the annular blocking net when the heat dissipation fan rotates to send the external air into the motor shell, and the particulate matter blocked on the annular blocking net does not completely cover and accumulate on the surface due to the annular structure of the annular blocking net, so that the heat dissipation fan can interact with the external air to the maximum extent.

The invention relates to the technical field of nylon co-extrusion film blowing, and particularly discloses a PP / PA film preparation method based on a PA-PP co-extrusion film blowing technology, which comprises the following steps: respectively melting and plasticizing a PP layer raw material and a PA layer raw material, extruding, blowing the film, and cooling to obtain a PP / PA film; wherein the melting and plasticizing temperature of the raw materials of the PP layer is 160-180 DEG C, and the melting and plasticizing temperature of the raw materials of the PA layer is 220-240 DEG C. Compared with a PP film and a PA film, the blown film disclosed by the invention not only has stronger barrier capacity and puncture resistance, but also has the characteristics of stronger moisture resistance, quality guarantee and fresh keeping, is long in shelf life, is convenient to operate and control, simplifies the production process, is high in production efficiency, and can be industrially produced on a large scale.

The invention discloses a preparation method of a composite material based on sodium carboxymethyl cellulose, and belongs to the field of preparation of high-performance composite materials. By optimizing process parameters, the prepared sodium carboxymethyl cellulose shows excellent acid and alkali resistance, the prepared sodium carboxymethyl cellulose is mixed with polyethylene glycol and vinyltrimethoxysilane grafted modified polylactic acid, and then the mixture is blended with starch gelatinization liquid, so that the acid and alkali resistant sodium carboxymethyl cellulose composite material is obtained. Sodium carboxymethyl cellulose in the composite system can promote vinyltrimethoxysilane grafted modified polylactic acid to form a better crystal form, and meanwhile, the mechanical property of a formed film can also be improved; polyethylene glycol can promote the compatibility of carboxymethyl cellulose in vinyltrimethoxysilane grafted modified polylactic acid and achieve a certain plasticizing effect, then the polyethylene glycol is mixed with starch, the mixture can be uniformly dispersed, on the premise that certain flexibility and barrier property are guaranteed, an obvious enhancement effect is achieved, the mechanical property of the material can be guaranteed on the whole, and the service life of the material is prolonged. Meanwhile, the obvious antibacterial property is also realized.