236 results about "Moisture permeation" patented technology

The invention discloses a food-grade high-temperature-resistant coating and a preparation method thereof. The high-temperature-resistant coating is prepared from 60-75% of matrix resin, 18-28% of surface hydrophobic modified nano functional filler and 10-20% of auxiliaries, and the nano functional filler is prepared from 10-15% of nano silicon dioxide, 5-8% of nano aluminum oxide and 3-5% of nano titanium dioxide. According to the food-grade high-temperature-resistant coating and the preparation method thereof, surface hydrophobic modification is carried out on nano particles through a silane coupling agent, the compatibility and dispersion stability of the nano particles in a resin matrix are remarkably improved, coating defects caused by agglomeration at high temperature are avoided, a hydrophobic barrier is formed by the modified nano filler, the moisture permeability is reduced, and the high-temperature-resistant performance of the food-grade high-temperature-resistant coating is improved. And the damp-heat aging resistance of the coating is enhanced.

The invention relates to the technical field of safety protection of power system equipment, in particular to an intelligent safety protection device for a switch cabinet, which comprises a cabinet body, the cabinet body is divided into a four-chamber structure, the upper part of the cabinet body is a bus chamber and is internally provided with a wire row template, the middle part of the cabinet body is a circuit breaker chamber and is connected with the bus chamber through a bus joint end plate, and the lower part of the cabinet body comprises two chambers. The independent sealing structure of the four chambers of the cabinet body is combined with condensation and drying circulation processing of the circulation collection assembly on moisture, moisture permeation among the chambers is effectively avoided, and the risk of insulation degradation is reduced. A humidity sensor monitors humidity distribution of each chamber in real time, triggers a generator to drive fan blades to accelerate airflow circulation and prevent local condensation, and triggers a sound-light alarm when the water level of a collecting pipe exceeds the limit to avoid short circuit caused by overflow of condensate water; the environment sealing assembly is in linkage with the traction rod through the limiting guide frame, an opening of the heat dissipation cover can be rapidly closed when external dust or humidity is too high, an internal circulation mode is switched, external pollution is isolated, and the operation safety of the device is improved.

The invention discloses a moistureproof coating, moistureproof printing label paper and a preparation method thereof, and belongs to the technical field of coatings, the moistureproof coating comprises the following raw materials by mass: 15-25 parts of acrylate resin, 5-15 parts of polyurethane, 5-10 parts of amine functionalized bridged siloxane, 2-4 parts of nano montmorillonite, 1-3 parts of a leveling agent and 45-55 parts of a solvent. The amine functionalized bridged siloxane can effectively prevent moisture permeation and prevent water vapor invasion, and can prolong the permeation path of water molecules and reduce the water permeation coefficient of the coating in cooperation with the nano montmorillonite, so that multiple water molecule barrier layers are formed, and the long-term moisture-proof stability of the label paper can be improved. Meanwhile, an amine functional group in amine functional bridged siloxane can improve the interface bonding force between the moisture-proof coating and the surface paper as well as between the moisture-proof coating and the adhesive, the ink receiving performance of the moisture-proof coating can be improved, and the printability of the label paper is improved.

The invention belongs to the field of high polymer materials, and discloses a double-trigger programmable degradable PHA composition and a preparation method thereof. A cured film structure formed by the composition sequentially comprises an outer protective layer, a trigger layer and an inner functional layer from outside to inside, wherein the outer protective layer takes polyhydroxyalkanoate as a base material, a reversible cross-linked network is introduced into the outer protective layer, the trigger layer is provided with humidity and ion double-trigger microcapsules, and the inner functional layer is used for bearing functional auxiliaries. The cured film can maintain low permeability and mechanical stability before application. After application, under the synergistic effect of specific moisture and ions, the trigger layer is activated, so that the cured film is subjected to step-type improvement of moisture permeability in a preset time window, and a through hole is formed. And finally, integral disintegration is realized through physical structure failure. The technology can be applied to the fields of seed coating and the like, the activity of a biological base material can be ensured by adopting a low-temperature process with the temperature lower than 50 DEG C, and unification of stable protection before application and on-demand disintegration after application is achieved.

The invention belongs to the field of functional textile materials, and provides a one-way moisture-conducting breathable fabric based on a vinyl elastomer and a preparation method of the one-way moisture-conducting breathable fabric based on the vinyl elastomer. The hydrophilic coating contains a vinyl elastomer matrix, polyvinyl alcohol, a zwitterionic polymer and a cross-linking agent, the hydrophobic coating contains a vinyl elastomer matrix, vinyl-terminated polydimethylsiloxane, polyhedral oligomeric silsesquioxane and other components, the coatings are only attached to the surfaces of yarn fibers and do not block pores, and a wettability gradient structure is formed; the excellent performance that the static contact angle gradient in the thickness direction is larger than or equal to 50 degrees, the capillary water absorption height from the inner side to the outer side is larger than or equal to 3.0 cm / 10 min, the capillary water absorption height from the outer side to the inner side is smaller than or equal to 1.0 cm / 10 min, the moisture permeation amount is larger than or equal to 5000 g.m.24 h, and the air permeability after curing is 65% or above of a fabric base material is achieved, the technical problem that an existing fabric is insufficient in moisture conductivity and air permeability is solved, and wide application value is achieved.

The invention provides high-humidity base paper and a quantifiable preparation process thereof, and relates to the field of paper production and processing. Comprising the following raw materials in percentage by mass: 15%-25% of softwood pulp, 40%-55% of hardwood pulp, 10%-25% of soft fibers, 10%-20% of nanocellulose, 0.5%-1.5% of vegetable fat polymer composite microspheres and 1%-3% of functional aids, wherein the solid content of aqueous suspension of the softwood pulp and the hardwood pulp is 3%-8%; the nano cellulose is subjected to surface modification treatment. According to the paper, coniferous wood pulp long fibers, hardwood pulp short fibers and soft fibers are utilized to form a three-dimensional framework, nano-crystalline cellulose enhances wet load transmission through a nanoscale bridging network, vegetable fat microspheres construct a hydrophobic layer to inhibit moisture permeation, the three components have a synergistic effect, so that the wet tensile strength is improved, and meanwhile, high air permeability is kept; and the balance of water resistance and ventilation is realized.

The invention discloses a cable head insulation paste reinforced cable, which relates to the technical field of cables, and comprises a main body mechanism, and the outer surface wall of the main body mechanism is movably sleeved with a protection mechanism; the protection mechanism comprises a protection sleeve; in the assembly process of the cable and the connector, the protective sleeve achieves accurate clamping through a linkage structure of gear transmission and rack pushing, after an arc-shaped plate drives a clamping block to be tightly attached to the protective layer, a spring drives a piston to extrude liquid insulation glue in a glue storage cavity, and the liquid insulation glue penetrates through a sealing film to form a uniformly-covered curing composite layer; the cured adhesive layer and the clamping block have a synergistic effect, and have multiple protection characteristics of isolating moisture permeation, strengthening connection rigidity and dispersing external impact, so that deterioration of insulation performance of a joint caused by invasion of water vapor or external pollutants can be effectively prevented, and contact resistance fluctuation caused by a vibration environment is also remarkably inhibited due to enhanced mechanical stability.

The utility model discloses an automatic regulation and control device for drip irrigation, which comprises a water control component, the water control component is arranged in a water distribution box, the water control component comprises a soil humidity probe, a controller, an air cylinder, a telescopic rod, an extrusion block, a plug block and a water seepage hole, and the soil humidity probe on the water control component is inserted into the surface layer of earth surface soil; the soil humidity probe can detect the soil humidity below the drip irrigation pipe, drip irrigation operation is carried out according to planting requirements, and when water permeates to the soil humidity probe, the soil humidity is higher than a set value of the controller and the soil humidity probe detects that the soil humidity is sufficient, a signal is sent to the controller, and the drip irrigation pipe is controlled to work. At the moment, the air cylinder pushes the extrusion block at one end of the telescopic rod to extrude the plug block in the water distribution pipe, the water seepage holes are attached to the inner wall of the water distribution pipe, position control over drip irrigation fixed points is achieved, automatic drip irrigation can be achieved according to soil humidity changes, meanwhile, watering and fertilization can be conducted synchronously, labor is saved, and the using effect is good.

The invention relates to the field of hygienic products, in particular to a bacteriostatic non-menstrual-period panty liner based on a sustained-release capsule and a preparation method thereof.It is found through screening that matrine and lactein have the synergistic bacteriostatic effect, the bacteriostatic composition is prepared into a sustained-release microcapsule, long-acting sustained release of antibacterial components is achieved, and the antibacterial effect is good. The sustained-release capsule is prepared into the bacteriostatic non-menstrual period protection pad based on the sustained-release capsule. The air permeability and the moisture permeability of the protection pad are superior to those of the prior art, the comfort and the safety of non-menstrual female hygiene care are remarkably improved, and the protection pad is suitable for daily hygiene maintenance and infection prevention.

The invention relates to the technical field of metal material processing, and discloses a double-sided burr nickel-plated steel strip and a preparation method thereof.The double-sided burr nickel-plated steel strip comprises a steel strip base body, the double faces of the steel strip base body are provided with three-dimensional burrs and nickel-plated layers, and each nickel-plated layer is composed of a plurality of nickel particles protruding out of the surface of the steel strip base body; the nickel particles are in any one or more of a conical shape, a pyramid shape or an irregular shape, the height of the nickel particles is 2-8 microns, and the bottom diameter of the nickel particles is 1-4 microns. And through electroplating treatment of a double-sided burr structure, the conductivity is remarkably improved, the contact resistance is effectively reduced, and the current distribution uniformity is improved. And meanwhile, the binding force between the plating layer and the substrate is enhanced by the pulse electroplating and periodic reversing electroplating technologies, the problems of interface stripping and plating layer falling are avoided, and the service life of the battery is prolonged. According to the burr structure, by increasing the surface roughness and the microscopic protrusions, the corrosion resistance of the plating layer is remarkably improved, and salt mist and moisture permeation are reduced.

The invention discloses tea leaf processing fermentation equipment which comprises a fermentation box body and a top cover fixedly installed at the top of the fermentation box body, box doors are arranged on the two sides of the fermentation box body, a heating mechanism is arranged at the bottom of the fermentation box body, a driving assembly is fixedly arranged above the top cover, and meanwhile a ventilation mechanism is further arranged above the top cover. One side of the fermentation box body is fixedly connected with a humidity adjusting mechanism, and one end of the humidity adjusting mechanism is fixedly connected with a bucket. Compared with the prior art, materials are uniformly distributed, and accumulation dead angles are avoided; moisture permeation is uniform, and the humidifying effect is excellent; temperature regulation and control are more accurate, and heat distribution is balanced; operation is convenient, and material loading and unloading are efficient.

The invention relates to the technical field of photovoltaic modules, and discloses a colorable PID-resistant carbon fiber photovoltaic module frame, which comprises a frame body, and is characterized in that the frame body is internally provided with a hollow structure; the honeycomb layer plate is embedded in the hollow structure of the frame body, and the honeycomb layer plate is composed of a plurality of regular hexagon honeycomb grid arrays; the interiors of the honeycomb grids are filled with the microcapsules, and repair materials capable of being oxidized and cured are packaged in the microcapsules; the water-absorbent resin is arranged in the honeycomb grid and is positioned at the front end of the microcapsule; the honeycomb lattice is of a conical structure with a narrow front part and a wide rear part and is used for guiding a repairing material to directionally flow to a crack area. According to the colorable PID-resistant carbon fiber photovoltaic module frame, the water-absorbent resin expands when encountering moisture to trigger the microcapsules to break, a released repairing material directionally flows to a crack area along the conical honeycomb grid, a high-insulation sealing layer is formed after oxidation and curing, a moisture permeation path is thoroughly blocked, the detachable shell is matched with a heat softening sealant structure, the honeycomb laminate is convenient to replace, and the service life of the frame is prolonged. And the service life is greatly prolonged.

The invention discloses an environment-friendly degradable plastic packaging bag and a preparation method thereof, belongs to the technical field of packaging bag preparation, and is used for solving the technical problem that the degradation capability and the mechanical property of an environment-friendly packaging bag in the prior art need to be further improved. According to the invention, the prepared carbonic acid bridged compact polyester is used as a main body skeleton to provide strength and film-forming property, silica acetal hybrid polysaccharide is introduced to form a compact and complex diffusion path inside and reduce gas and moisture permeation, and then active side chain polyamino acid is added to adjust interfacial compatibility and enhance structural stability, so that the film-forming property is improved. Through reasonable combination of the three components, the environment-friendly packaging bag keeps high tensile strength and tearing strength, meanwhile, the barrier property is remarkably improved, and gradual complete degradation is achieved in compost and soil environments.

The invention discloses a straw pre-wetting time judgment method and system, particularly relates to the technical field of agricultural waste treatment intelligent control, and is used for solving the problem of multi-target conflict between existing pre-wetting process parameters and tunnel fermentation energy consumption. The method comprises the following steps: acquiring initial moisture content and bulk density distribution data of straw in real time, identifying spatial distribution of a high-density blocking region and a low-density permeation channel in a stacking layer, and generating an effective length reflecting a moisture permeation path; generating a pre-wetting time reference value based on dynamic weight fusion of the current batch and historical pre-wetting data, and performing collaborative correction in combination with a coupling relationship between equipment idling time and ventilation energy consumption; the pre-wetting time threshold value is dynamically adjusted through a cooperative feedback mechanism of the main fiber direction of the straw stalks and the acoustic impedance characteristics of the stacking layers; finally, a termination instruction is triggered according to the continuous stable state of the surface layer moisture content and the fiber orientation, and precise balance between energy consumption and process efficiency is achieved while the pre-wetting uniformity is improved.

The utility model provides a perovskite photovoltaic module, a power utilization device, a photovoltaic system and a power generation device. The perovskite photovoltaic module comprises a perovskite cell, a convergence piece, a packaging layer and a cover plate which are stacked in sequence. The perovskite cell comprises a perovskite layer and a first electrode layer which are arranged in a stacked mode, the packaging layer is at least laid on the outer edge of the perovskite cell, the packaging layer is provided with a hole channel, and an opening of the hole channel is located in the side face of the packaging layer; the bus member is connected to the first electrode layer and passes through the hole channel on the side surface of the packaging layer. In the perovskite photovoltaic module, the pore channel is arranged on the packaging layer, and the opening of the pore channel is positioned on the side surface of the packaging layer, so that the moisture permeation distance can be adjusted through the coating length of the packaging layer on the convergence piece, the moisture permeation risk is reduced, and the risk that the perovskite layer is damaged is further reduced; and the stability of the photoelectric conversion efficiency of the perovskite photovoltaic module is improved.

The invention relates to the technical field of building construction, and discloses a cold-bridge-prevention thermal insulation construction method for a wall body of a refrigeration house, which comprises the following steps of: pre-treating a wall surface before construction, then directly spraying cyanogen condensate on the treated wall surface on the cleaned wall surface, and designing and installing wood and T-shaped piles in order to enable the cyanogen condensate to fully permeate into a base layer. Then, a steel row gun is used for installing the wall surface, polyurethane foaming spraying construction is conducted after installation, the thickness of foam sprayed in a single layer is conducted for the first time, an anti-crack fiber net is hung and a transverse cork wood keel is installed when the foam is sprayed to be half of the design thickness, a polyurethane heat preservation layer is sprayed to be the design thickness, and after polyurethane spraying foaming finishing is completed, the position of a door and window opening is located at the position of a door and window opening; and wall surface heat preservation and color steel plate construction are completed. By the adoption of the double-layer spraying cyanogen condensation waterproof vapor-proof layer, effective moisture prevention and air tightness are achieved, the effect of greatly reducing moisture permeation in the refrigeration house is achieved, formation of a cold bridge is avoided, and the energy-saving effect of the refrigeration house is improved.

The utility model discloses a three-proofing velvet fabric, and belongs to the field of velvet fabrics. The fabric comprises a fabric structure, transverse braided wires comprise jute fibers and a coating agent A smeared on the outer surfaces of the jute fibers, and vertical braided wires comprise bamboo fibers and a coating agent B smeared on the outer surfaces of the bamboo fibers. The bamboo fibers and the jute fibers are soaked in the coating agents, the coating agent A and the coating agent B change the tension on the surfaces of the bamboo fibers and the jute fibers respectively, moisture permeation is prevented, the situation that the fabric generates mould due to water absorption is avoided, the polyamide fibers are high in abrasion resistance, and the polyester fibers have good tensile resistance and abrasion resistance, so that the fabric is comfortable to wear. The neat appearance of the fabric is conveniently kept, the polytetrafluoroethylene film A and the polytetrafluoroethylene film B allow air to pass through, the air permeability of the fabric is kept, the wind resistance of the fabric is improved through arrangement of the polyamide fibers and the polyester fibers, the woven transverse weaving threads and the woven vertical weaving threads are subjected to waterproof treatment through the arranged composite coatings, and the fabric has the three-proofing advantage.

The invention relates to the technical field of optical cables, in particular to an embedded optical fiber temperature measurement integrated optical cable and a process, and the process of the embedded optical fiber temperature measurement integrated optical cable comprises the steps of preparation of a flame-retardant filler, hydrophobic modification of the flame-retardant filler, preparation of a hydrophobic anti-icing coating and preparation of an integrated optical cable. A compact carbon layer is formed, inert gas is released to stop fire, the filler structure is stable, and the temperature measurement optical fiber is prevented from being damaged by component migration; secondly, the rosin hydrophobic modifier is used for modifying the flame-retardant filler, water absorption is reduced, moisture permeation is prevented, aging is resisted, the temperature measurement function is guaranteed, and the service life of the optical cable is prolonged; and thirdly, the hydrophobic antifouling attapulgite coating can prevent water adhesion, inhibit pollutant adsorption to resist icing, enhance the mechanical properties of the coating, ensure stable adhesion and reduce the maintenance cost in winter.

The invention discloses an epoxy glue tail-attached external potting mold for an engine cable connector, and relates to the technical field of tail-attached cable potting, the epoxy glue tail-attached external potting mold comprises a mold support, a wire passing clamp used for placing a tail-attached cable piece is arranged on the mold support, and the lower end of the tail-attached cable piece penetrates through a potting mold body and a potting mold cover to be connected with a joint connector. The glue pouring mold body and the glue pouring mold cover are arranged in a matched mode, a cavity space enabling epoxy glue to be formed outside the tail attaching cable piece in a thermoplastic mode is formed in the glue pouring mold body and the glue pouring mold cover, and a connector male head is arranged at the end, away from the tail attaching cable piece, of the connector connector. According to the epoxy glue tail-attached external potting mold for the engine cable connector, the mold is simple in structure and high in positioning precision, the problem of bubble residues in the potting process can be avoided, good sealing performance and insulating performance are achieved, it is ensured that the tail-attached cable piece is evenly coated with epoxy glue, the waterproof effect, the moisture permeation blocking effect and the anti-corrosion effect are achieved, and the service life of the tail-attached cable piece is prolonged. And chemical corrosion is resisted.

An anti-sedimentation municipal road structure comprises a roadbed, a cavity is formed in the center of the interior of the roadbed, a plurality of drainage ports are formed in the lower end face of the roadbed in a rectangular arrangement mode, an anti-overload sedimentation structure is arranged in the center of the upper end face of the roadbed, and supporting and stabilizing structures are arranged on the outer side wall of the roadbed and the interior of the cavity. A protection structure is arranged at the center of the lower end face of the roadbed. Compared with the prior art, all-directional supporting and stabilizing effects are provided, the stability of a municipal road in the vertical direction and the horizontal direction is enhanced, differential settlement and deformation of a roadbed are effectively prevented, and the flatness and the safety of the road are guaranteed; the compactness, the bearing capacity and the stability of the roadbed can be effectively improved, so that the settlement problem caused by overload is reduced; the roadbed can be prevented from being eroded by accumulated water, moisture permeation is avoided, the strength and stability of the roadbed are improved, and the service life of a road is prolonged.

The utility model discloses a fluorocarbon spraying aluminum veneer anti-seepage curtain wall, and relates to the technical field of anti-seepage curtain wall equipment, the fluorocarbon spraying aluminum veneer anti-seepage curtain wall comprises a waterproof curtain wall, the lower end of the waterproof curtain wall is provided with a sealant, the lower end of the sealant is provided with a mounting rack, the lower end of the mounting rack is provided with a fluorocarbon spraying aluminum veneer, and the lower end of the mounting rack is provided with a fluorocarbon spraying aluminum veneer. A mounting beam is arranged on the outer wall of the mounting frame, bolts are arranged on the outer surface of the mounting beam, the dust dense layer serves as the outermost layer of the curtain wall and effectively blocks dust, particulate matter and other fine impurities in air through the specific structure of the dust dense layer, potential damage of the impurities to a subsequent waterproof layer is reduced, the cleanliness of the surface of the curtain wall is kept, and the service life of the curtain wall is prolonged. The watertight layer is located behind the dust-tight layer, the main function of the watertight layer is to prevent permeation of liquid water such as rainwater and water vapor, the design of the watertight layer considers the flow characteristic and sealing performance of water, the air tightness of the curtain wall is further enhanced, moisture permeation caused by air flow is prevented, and meanwhile, the heat preservation and heat insulation performance in a building is also improved.

The invention relates to the technical field of rocky desertification area hydrological process monitoring and soil moisture migration research, and discloses a device and a method for researching the moisture permeation rate of an in-situ rock-soil interface in a rocky desertification area, a water inlet device comprises a water tank, a rotor flow meter and a connecting pipeline, and the water tank is arranged at a position higher than the rotor flow meter; the water outlet device comprises a water inlet, an internal flow stabilizing cavity and a plurality of small water outlet holes uniformly distributed in the length direction, the water inlet is formed in the lower portion of the flow stabilizing cavity and connected with the connecting pipeline, and the small water outlet holes are formed in the upper portion of the flow stabilizing cavity; the bracket is used for fixing the water outlet device at the upper part of the exposed rock surface, so that the small water outlet holes are distributed close to the rock surface; the controllable rock surface flow is stably generated under the complex rock-soil interface condition, a reliable technical platform is provided for in-situ moisture permeation rate measurement, and the technical bottlenecks that an existing device cannot simulate rock surface flow concentration and is difficult to adapt to a heterogeneous interface are overcome.

A display device comprises: a substrate 301 including a display area (AA, Figure 3), a through-hole TH, a non-display area (OA, Figure 3); a light emitting element (350, Figure 4); and a pattern area 210, 220 in the non-display area including at least one metal pattern. An encapsulation layer including an inorganic film 361, 363 is positioned on the light emitting element and disposed in the pattern area. The metal pattern has a side portion exposed through the through-hole. The metal pattern may include three metal layers (211a-c, Figure 6) sequentially stacked. The light emitting element may have an anode (351, Figure 4), a cathode 353, and an organic light emitting stack 352, a portion of the organic light emitting stack being disposed on the metal pattern. This reduces side moisture permeation due to delamination in a hole in display (HID) or hole in active area (HiAA) display.

A transparent display apparatus is provided, which has excellent encapsulation characteristics while reducing a bezel width. The transparent display apparatus includes a display area disposed on a substrate, including a pixel having a transmissive portion, and a non-display area disposed near the display area, having a GIP portion, and a moisture permeation preventing portion disposed between the GIP portion and the display area.

An air purification device (1) is provided, comprising a container (2) defining a housing for a culture substrate (1b) for at least one plant (1a) and including at least a bottom (20) extending along a main surface (2a), side walls (21) extending around the bottom (20) and configured to laterally delimit the substrate (1b); a panel (3) superimposed on the bottom (20), defining a supporting surface suitable for contacting the substrate (1b) so as to delimit it inferiorly within the container (2), and including a plurality of solid areas (30) devoid of holes, and a plurality of perforated areas (31), each including a plurality of holes (31a) allowing an airflow to pass through the panel (3), exclusively formed within the perforated areas (31) so that at least the substrate (1b) at the perforated area (31) is crossed by the airflow, and the substrate (1b) at the solid area (30) is not crossed by the airflow, ensuring the retention of moisture in the substrate (1b) confined within at least one solid area (30) and thus promoting the formation of a biofilm within the substrate (1b), which purifies the airflow; and wherein the bottom (20) comprises ducts (20a) crossed by the airflow, protruding from the main surface (2a) toward a respective solid area (30) without contacting it, so that when moisture percolates through the holes (31a), it can settle on the bottom (20) and flow toward the groove (22), while the airflow can flow from the ducts (20a) toward the holes (31a) without contacting the moisture.

To provide a semiconductor device of which the electrical characteristics are hardly varied even if operated under an environment where moisture is present.SOLUTION: An insulation layer consisting of an inorganic insulation material is provided on a top face, which is one face of a support substrate consisting of polymers or filler-containing polymers. A circuit formation layer including a semiconductor element is provided on the insulation layer. A bottom face, which is at the opposite side of the top face, and side faces of the support substrate are covered by a coating formed from a material having lower moisture permeability than that of the support substrate.SELECTED DRAWING: Figure 1

The invention relates to the technical field of shielding tape preparation, and provides a nano-copper-aluminum alloy shielding tape which comprises a nano-copper-aluminum alloy core layer which is composed of copper, aluminum and a surface modifier, the atomic ratio of the copper to the aluminum is 6: 4-8: 2, and the surface modifier accounts for 0.5%-3% of the total mass of the alloy; the antioxidant coating layer coats the surface of the nano copper-aluminum alloy core layer, is composed of a polydopamine-silicon dioxide composite layer, and is 50-200 nm in thickness; according to the flexible polymer matrix, the nano copper-aluminum alloy core layer is evenly dispersed in the matrix, and the mass ratio of the matrix to the core layer is 95: 5-80: 20. The anti-oxidation coating layer of the nano copper-aluminum alloy shielding tape is formed by compounding polydopamine and silicon dioxide, oxygen and moisture permeation is doubly blocked, the oxidation resistance is improved, the service life is prolonged, thermoplastic polyurethane or silicone rubber is used as a matrix, dual guarantee is achieved with the coating layer, the exposure risk of nano particles is reduced, biocompatibility is considered, and living body and environment safety is guaranteed.

The invention relates to a multilayer release film and a preparation method thereof, and relates to the technical field of release film preparation. The preparation method comprises the following steps: dispersing epoxy acrylate, polyethylene glycol diacrylate and hydroxyethyl acrylate in a solvent, adding a composite photoinitiator, carrying out a reaction in a dark place, adding isophorone diisocyanate to obtain first slurry, coating the surface of a base material, and carrying out an illumination reaction to obtain a bottom layer; mixing polyvinyl alcohol and Ti3C2F to obtain a mixed solution, separating to take a solid phase, dispersing the solid phase in a solvent, mixing the solid phase with a polyamide acid solution to obtain second slurry, and coating the surface of the bottom layer to obtain a transition interlayer; dispersing polyurethane acrylate, polytetrahydrofuran acrylate, allyl laurate and 1-hydroxycyclohexyl phenyl ketone in a solvent, adding hydrogenated diphenylmethane diisocyanate to obtain third slurry, and coating the surface of the transition interlayer with the third slurry to form a surface layer to obtain the multi-layer release film. According to the invention, polyvinyl alcohol-Ti3C2F is introduced to form a physical barrier, moisture permeation is hindered, the moisture resistance of the release film in a humid environment is improved, and the damage of water to the structure and performance of the film is reduced.

The invention relates to a waterproof ceramic tile adhesive and a preparation method thereof, and belongs to the technical field of building decoration materials. The waterproof tile adhesive comprises a composite waterproof agent, wherein the composite waterproof agent comprises active silane-based powder and hydrophobic redispersible latex powder; wherein the mass ratio of the active silane-based powder to the hydrophobic redispersible latex powder is (1: 2)-(2: 1). The preparation method of the waterproof ceramic tile adhesive comprises the following steps: uniformly mixing the raw materials comprising the composite waterproof agent, discharging and packaging to obtain the waterproof ceramic tile adhesive. The waterproof ceramic tile adhesive provided by the invention not only has high bonding strength, good weather resistance and constructability, but also has excellent and lasting overall waterproof performance, can effectively block moisture permeation, and is suitable for various high-humidity and water-immersed environments.

The invention relates to a post-treatment method for a mercury-based II-VI group nanocrystal with a protective layer formed by chemical oxidation, and solves the problems of poor stability and photoelectric property degradation of the mercury-based II-VI group nanocrystal caused by surface oxidation, ligand desorption and environmental sensitivity. An oxide protection layer with the thickness of 1-3 nm is formed on the surface of the nanocrystal, the long-term stability and the photoelectric property of the nanocrystal are improved, and the method comprises the specific steps of centrifugal purification of the nanocrystal, preparation of an oxidizing agent solution, controllable oxidation reaction, functional ligand surface modification and purification treatment. The oxidation layer is ensured to be compact and stable by accurately adjusting the concentration of the oxidant, the reaction temperature and the reaction time. According to the method, oxygen and moisture permeation is effectively blocked, surface defects are reduced, the quantum yield and the photoelectric property are improved, and the method is widely applied to the fields of post-treatment of mercury-based II-VI group nanocrystals and photoelectric devices.