53results about How to "Avoid delamination" patented technology

This invention provides an antistatic and privacy-protecting polarizing film and its preparation process, belonging to the field of polarizing film preparation technology. The preparation process includes the following steps: preparation of an antistatic agent; preparation of a modified adhesive; preparation of a composite polarizing film; and preparation of the polarizing film. This invention introduces an antistatic agent and POSS-modified graphene oxide into the modified adhesive, making the adhesive layer a conductive medium connecting multiple layers such as the polarizing film (PVA), TAC layer, and privacy film, forming a cross-layer conductive path. This avoids static electricity accumulation at the interface, improving the antistatic effect. Boric acid is first used to crosslink the PVA film, followed by glyoxal crosslinking, achieving long-term reliability of the polarizing film under high temperature and high humidity environments.

The present application relates to the technical field of road engineering, and particularly relates to a bridge-head cover plate combined fiber anti-cracking flexible splicing structure and a preparation method thereof, which comprises a base layer with an asphalt pavement part on the top and an abutment; the base layer, the abutment and the asphalt pavement part form a groove, the side wall of the groove is formed by the asphalt pavement part, the bottom wall of the groove is formed by the base layer and the abutment; the inner wall of the groove is coated with a two-component high-viscosity high-elasticity interface adhesive; from bottom to top, the groove is sequentially filled with a high polymer elastic body and a reinforced anti-cracking asphalt mixture; a basalt fiber bar anchoring member is pre-buried in the inner wall of the groove, and the high polymer elastic body and the reinforced anti-cracking asphalt mixture wrap the basalt fiber bar anchoring member; through the stress diffusion of the interface adhesive layer, the deformation buffer of the flexible bottom layer and the anti-cracking cooperation of the rigid surface layer, the road surface longitudinal slope mutation caused by the differential settlement of the abutment and the base layer is effectively relieved, the vehicle jumping impact force is reduced, the road surface longitudinal corner is reduced, and the driving smoothness and the structural durability are significantly improved.

This invention discloses a modification method for nanocrystalline magnetic core encapsulation materials. The method includes: S1: surface functionalization modification of nano-silica and boron nitride nanosheets by grafting amino and epoxy groups, respectively; S2: blending and dispersing the modified inorganic nanofiller with low-viscosity bisphenol A type epoxy resin, flexible epoxy resin diluent, latent curing agent, and coupling agent under high shear force to form a uniform and stable modified epoxy resin composition; S3: plasma cleaning and activation treatment of the nanocrystalline magnetic core; S4: encapsulating the modified epoxy resin composition on the surface of the magnetic core using a vacuum pressure impregnation process, followed by programmed temperature curing. This invention significantly improves the mechanical strength, thermal conductivity, and heat resistance of the encapsulation layer and reduces the high-frequency dielectric constant and loss by constructing an organic-inorganic interpenetrating network and interface reinforcement.

The application relates to a stone-plastic floor and an extrusion molding preparation method of the stone-plastic floor, and relates to the stone-plastic floor processing technical field.The stone-plastic floor comprises polyvinyl chloride resin, heavy calcium carbonate, calcium-zinc stabilizer, abrasive powder, internal lubricant, and external lubricant; and the preparation steps comprise feeding and mixing, extrusion, calendering, film covering, traction and cutting, and slotting; the low-temperature cold mixing realizes energy saving and consumption reduction, the stabilizer decomposition and lubricant volatilization problems caused by high temperature are avoided, the filler dispersion uniformity and interface bonding force are improved, the large-diameter specification extruder is adopted to improve the production efficiency, the material uniform plasticization is guaranteed by cooperating with the melting section cooling area, the processing stability and the finished product qualification rate are effectively improved, the stability, wear resistance and waterproofness of the stone-plastic floor are finally obviously improved, the service life is prolonged, and the stone-plastic floor has the advantages of environmental protection and production efficiency.

The utility model relates to the technical field of wires and cables, in particular to a halogen-free cable with an anti-cracking structure, which comprises a conductor, an insulating layer, a filling layer, an anti-cracking layer and a sheath layer which are sequentially arranged from inside to outside, the anti-cracking layer consists of a corrugated elastomer layer and a reinforcing piece, the corrugated elastomer layer is coated on the outer surface of the insulating layer, and the reinforcing piece is coated on the outer surface of the insulating layer. The wave-shaped elastomer layer provides a telescopic space, absorbs mechanical stress and prevents stress from being concentrated on the sheath layer through periodic distribution of wave crests / wave troughs of an axial wave structure when the cable is bent or subjected to external force, so that generation of cracks is inhibited, and spirally wound fibers / metal wires of the reinforcer are embedded into the wave troughs to form constraint. Excessive deformation of the corrugated elastomer layer is limited, tensile strength is improved, radial cracking expansion is prevented, the sheath layer and the anti-cracking layer are welded, the sheath layer and the corrugated elastomer layer are welded through a co-extrusion process, a traditional interlayer interface is eliminated, interlayer stripping caused by thermal expansion and cold contraction or external force is avoided, and the service life is prolonged.

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 utility model relates to the technical field of aluminium veneer provides a kind of aluminium veneer of firm installation, including aluminium veneer body, the outer wall of aluminium veneer body one side is uniformly fixed with longitudinal reinforcing rib, adjacent the longitudinal reinforcing rib between uniformly fixed with reinforcing structure, the reinforcing structure includes transverse reinforcing rib, limit stop and fixed bolt, the transverse reinforcing rib is uniformly set in aluminium veneer body near the side of longitudinal reinforcing rib.The utility model is provided with reinforcing structure, transverse reinforcing rib and longitudinal reinforcing rib form grid structure, can significantly improve the bending stiffness of aluminium veneer body when using, prevent wind pressure deformation, limit stop is locked with longitudinal reinforcing rib by fixed bolt, ensure reinforcing rib spacing uniform, avoid misplacement, guarantee the stability of connection, realized the device has the function of strengthening aluminium veneer body conveniently, improved the stability of this aluminium veneer of firm installation when using.

The invention provides an interface buffer material, a secondary battery and an electric device, and relates to the technical field of electrochemical energy storage materials. The interface buffer material disclosed by the invention comprises Ti < 3 > C < 2 > T < x > MXene and an inorganic ceramic layer coated on the surface of the Ti < 3 > C < 2 > T < x > MXene, the inorganic ceramic layer includes an oxysalt layer and a non-oxide layer. When the interface buffer material is applied to the solid-state battery, the cycling stability of the solid-state battery can be improved, and the interface impedance of the solid-state battery can be reduced.

The invention discloses a preparation method of a polyurethane gel product with a rapid shaping characteristic. The method comprises the following steps: firstly, synthesizing a special polyol monomer with the primary hydroxyl group content of 70-85% through a specific process, and then respectively preparing soft inner gel component prepolymers A and B and hard outer gel component prepolymers C and D; the method is characterized in that a combined pouring and stepped curing process is adopted, specifically, prepolymers A and B are mixed and then injected into a mold to be subjected to preliminary chemical curing to form an inner gel layer, then a mixture of prepolymers C and D containing photoinitiators is poured on the surface of the inner gel layer, ultraviolet irradiation is conducted immediately to achieve surface photocuring, and finally the product is obtained through overall thermocuring. According to the method, through molecular design, prepolymer synergy and process optimization, the technical problem that high elasticity and rapid forming are difficult to consider at the same time is solved, and the prepared gel product has the comprehensive advantages of being low in hardness, high in rebound rate, small in permanent deformation, high in interlayer binding force, short in forming period and the like.

This invention relates to a GaAs-based flip-chip Mini LED and its fabrication method. The chip comprises, from bottom to top, a transparent substrate, a bonding layer, a P-current spreading layer, and a P-ohm layer. A mesa is disposed on the P-ohm layer. The mesa, from bottom to top, comprises a P-waveguide layer, a light-emitting layer, an N-waveguide layer, an N-current spreading layer, an N-buffer layer, and an N-ohm layer. A P-electrode is disposed on the P-ohm layer below the mesa; an N-electrode is disposed on the N-ohm layer above the mesa. Electrode pads are disposed directly above both the P-electrode and the N-electrode. By setting electrode pads, the soldering required in packaging production is combined with the electrode structure, eliminating the need for solder paste application on the substrate, thus achieving chip-substrate interconnection and facilitating modular production of the packaged chip. This effectively improves the problems of weak chip-substrate bonding strength, high coefficient of thermal expansion, cumbersome manufacturing, and high production costs in chip packaging.

The utility model discloses a carbon fiber surface layer snowboard, which comprises a surface layer, a core layer and a bottom layer which are sequentially laminated, the surface layer is a carbon fiber fabric curing plate, and a glass fiber and / or carbon fiber fabric reinforcing layer is arranged between the surface layer and the core layer and / or between the core layer and the bottom layer. The carbon fiber fabric solidified plate is used as the surface layer of the snowboard, so that the overall strength and rigidity of the snowboard are remarkably improved, the weight is greatly reduced, a skier can control the snowboard more easily and freely, and the flexibility and comfort of sliding are improved; the glass fiber and / or carbon fiber fabric reinforcing layer is additionally arranged, so that the impact resistance of the snowboard is further enhanced, the damage risk during high-speed sliding or collision is effectively reduced, meanwhile, the torsional rigidity is improved, and the stability and the control accuracy of the snowboard in a complex snowway environment are ensured; interlayer stripping is prevented, and the durability of the snowboard is also improved.

The application relates to the technical field of coil coating, and discloses a radiation refrigeration coil coating composition, a coating and application, the coating composition comprises a basecoat composition and a topcoat composition which are arranged independently. The basecoat composition comprises polyvinylidene fluoride resin slurry, hydroxy acrylic resin, heat-reflecting filler and blocked polyisocyanate curing agent; the topcoat composition comprises polyvinylidene fluoride resin slurry, hydroxy acrylic resin, heat-emitting filler and topcoat crosslinking agent. The application sets the unblocking starting temperature of the basecoat curing agent to be lower than the starting temperature of the topcoat crosslinking reaction, realizes gradient crosslinking of a multilayer coating film from bottom to top, and solves the exhaust blistering defect during baking of a thick coating film. The glass transition temperature of the multilayer coating body is controlled to be 35 DEG C to 50 DEG C, the deformation requirement of warm stamping processing is met, and the coating film is prevented from cracking.

The invention discloses an alternating multilayer polymer foam material and a preparation method thereof. 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 50-500 microns, and the thickness of the polymethyl methacrylate layers is 50-500 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 first foam hole layer, the polymethyl methacrylate layer forms a second foam hole layer, and the alternate multi-layer polymer foam material is prepared.

This application relates to the field of sealing materials, specifically disclosing an insulating sealing gasket for nuclear power equipment and its preparation method. The insulating sealing gasket for nuclear power equipment of this application comprises an outer layer material and an inner layer material, with the outer layer material covering the surface of the inner layer material. The outer layer material is composed of the following components by mass percentage: 50%-60% silane coupling agent modified phenolic resin, 35%-45% composite fiber, and 3%-5% epoxy functionalized silane bonding accelerator. The inner layer material is composed of the following components by mass percentage: 45%-55% fluorine-modified epoxy resin, 30%-40% polyimide fiber, and 10%-20% high-temperature resistant nano-reinforced microspheres. The insulating sealing gasket for nuclear power equipment of this application has the advantages of high pressure resistance and high temperature resistance.

This invention discloses a graphite mesh skeleton copper-based composite material and its preparation method, belonging to the field of thermal management materials. The composite material includes a vertical graphite mesh skeleton, copper pillar supports in the center of each mesh unit, and copper-based filler phases filling the gaps. The high thermal conductivity direction of the graphite surface is aligned with the material thickness direction, and its sidewalls have micropores. After sintering, the copper-based filler phases pass through the micropores, causing the copper in adjacent meshes to fuse together to form a three-dimensional through-network. The preparation method includes graphite cutting and drilling, skeleton assembly, introduction of copper pillars and copper powder filling, and sintering densification. This invention suppresses the collapse of vertical graphite during sintering through the central copper pillars and breaks the physical separation of the matrix through the physical riveting effect of the micropores, significantly improving interfacial bonding and macroscopic mechanical strength, while maintaining excellent out-of-plane continuous directional thermal conductivity.

This invention relates to an embedded, transparent protective structure resistant to repeated impacts. It comprises a transparent ceramic curved armor plate, a transparent fiber-reinforced skeleton, a polycarbonate curved backplate, an epoxy resin coating, and an STF shear-thickening coating. The polycarbonate curved backplate has a central groove with a concave bottom. Each polygonal unit of the transparent fiber-reinforced skeleton contains a transparent ceramic curved armor plate. The gaps between the transparent ceramic curved armor plates and the transparent fiber-reinforced skeleton are filled with the STF shear-thickening coating. The bottom of the overall structure formed by the transparent ceramic curved armor plates, the transparent fiber-reinforced skeleton, and the STF shear-thickening coating is a convex curved surface, and the upper part of the overall structure is also a convex curved surface coated with an epoxy resin coating. This invention uses segmented, interlocking fibers in the armor plates to inhibit the propagation of crack damage, ensuring that the protective capabilities and visibility of other areas are not affected after an impact. Combined with the function of the curved structure, the overall structure is embedded in the curved backplate, forming an embedded structure.

The application discloses a tire pattern structure with anti-puncture and active stone discharge for gravel pavement, and relates to the technical field of tires.The technical scheme is as follows: a pattern block is arranged on a tread, pattern grooves are arranged between the pattern blocks, the groove bottoms of the pattern grooves are provided with elastic protection teeth in a zip fastener shape and engaged with each other in the circumferential direction of the tire, the elastic protection teeth are provided with an engagement gap therebetween for discharging stones, and the groove bottoms of the pattern grooves are provided with a gradient hardness buffer layer below the elastic protection teeth, wherein the Shore hardness of the gradient hardness buffer layer gradually changes from 75HA to 65HA from a surface layer in contact with the elastic protection teeth to an inner layer away from the elastic protection teeth.The application realizes the organic combination of stone discharge and anti-puncture through the synergistic effect of multiple structures, greatly reduces the early damage probability of the tire when driving on the gravel pavement, effectively prolongs the actual service life of the tire, improves the safety of the tire when driving on the gravel pavement, and has significant technical advantages and practical value compared with the prior art.

The utility model discloses a sealing device for processing a glass fiber reinforced plastic septic tank, which relates to the technical field of environmental protection equipment, and comprises a tank body, the top end of the tank body is fixedly connected with three groups of cleaning openings, and the sealing device for processing the glass fiber reinforced plastic septic tank is provided with an inner cover, a sealing ring and a connecting block. Due to the fact that the first expansion rubber ring and the second expansion rubber ring can expand when encountering water due to the material characteristics of the first expansion rubber ring and the second expansion rubber ring, if the water level in the pool body rises into the cleaning opening, the first expansion rubber ring and the second expansion rubber ring extrude each other after being expanded when encountering water and are tighter, and gas or liquid is prevented from overflowing upwards. Meanwhile, leakage can be prevented through preliminary isolation of the inner cover, after the inner cover is installed downwards, the top cover is directly inserted downwards into the top end of the inner cover, the sealing ring surrounds the periphery of the inner cover for further sealing and preventing overflow, at the moment, the top cover and the cleaning opening are fixed, secondary isolation is conducted, leakage is prevented, and the problem that the sealing performance of the device cannot be enhanced is solved.

This application discloses a dielectric gradient coating for insulating separators, its preparation method, and its application, belonging to the technical field of electrical equipment insulation materials. The method includes the following steps: (1) adding ethylenediamine and perfluorooctyltrimethoxysilane to a solvent to obtain a modified solution, and then adding nano-graphene to the modified solution to obtain fluoroammonia-modified graphene; (2) mixing the first and second dispersions prepared from the fluoroammonia-modified graphene and magnesium-aluminum hydrotalcite respectively to obtain electrostatic spraying liquids with different concentration gradients; (3) sequentially electrostatically spraying the electrostatic spraying liquids with different concentration gradients onto the surface of the separator to form a dielectric gradient coating, wherein the dielectric constant in the dielectric gradient coating increases from the inside to the outside. In this method, the fluoroammonia-modified graphene is uniformly dispersed in epoxy resin and improves the density of the epoxy resin, thereby increasing the bonding force between the coating and the substrate, and thus improving the service life of the insulating separator under high temperature and high humidity conditions.

The application discloses a paper-based high-barrier material with a water-based PHA coating and a PHA extrusion layer, and a preparation method and application thereof, and belongs to the technical field of biodegradable polymer materials and environment-friendly packaging. The scheme innovatively introduces a two-component system with a specific melting point difference to construct a water-based pre-coating layer, and utilizes a double mechanism of "micro-leveling + interface thermal fusion" to realize efficient closing and strong anchoring of a rough base material at a very low coating amount. Compared with a traditional thick-layer shower film process, the material realizes more excellent barrier integrity and oil resistance and moisture resistance performance with a thinner extrusion surface layer, significantly improves moisture resistance and oxygen resistance performance, and simultaneously solves the requirement of puncture resistance of dry and hard food packaging materials through a unique stress balance design of the double-layer system. The material does not contain fluorine-based additives, is completely biodegradable, and meets the high-standard requirement of food safety compliance.

The utility model relates to a filling technical field discloses a piston type quantitative filling mechanism and filling machine, including filling machine device, the fixedly connected with mounting bracket of filling machine device, draw component, draw component sets up on mounting bracket, draw component is used for continuously drawing filling liquid, and draw component includes material storage jar, mounting block, piston block and activity disc, and material storage jar is fixedly connected with mounting bracket, and mounting block is fixedly connected with material storage jar, and piston block is set around on mounting block, and activity disc is movably connected between mounting block, and intermittent transmission is connected between activity disc and piston block, the lateral wall of material storage jar is fixedly connected with feed pipe, and the bottom of material storage jar is fixedly connected with discharge pipe, and one way valve is installed in feed pipe and discharge pipe, and the one way valve in feed pipe faces material storage jar, and piston block intermittent lifting is realized through the cooperation of draw component internals, and the continuous drawing filling liquid is realized in piston block intermittent lifting, and the flow break of filling liquid is avoided.

This application discloses a sealing gasket and an electrolytic cell, relating to the field of electrolytic cell technology. The sealing gasket includes a skeleton and an elastic portion. The skeleton is annular, with its central axis extending along a first direction. The elastic portion is fixedly connected to the skeleton and includes two abutment layers, which are respectively disposed on opposite sides of the skeleton in the first direction. The skeleton is embedded in the abutment layers, or the abutment layers are embedded in the skeleton. The technical solution provided by this application aims to improve the structural strength of the sealing gasket, thereby ensuring the sealing performance of the electrolytic cell.

The invention discloses a gradient cooling multilayer metal blast furnace composite water jacket and a preparation method thereof, and belongs to the technical field of lead and zinc smelting. The water jacket comprises a multi-layer metal composite plate formed by welding a contact layer, a heat exchange layer and a substrate layer in a weldless mode. A rectangular slag tap is formed in the bottom of the composite water jacket along the central axis of the composite water jacket; s-shaped cooling pipelines are arranged in the heat exchange layer, and the pipeline distance of the cooling pipelines is increased from the end close to the slag discharging opening to the end away from the slag discharging opening. The preparation process of the water jacket comprises the steps that the multi-layer metal composite plate is obtained through weldless welding, then the multi-layer metal composite plate penetrates into the heat exchange layer from one side of the base layer through machining, the S-shaped cooling pipeline is formed, then the base layer is complemented, only a cooling pipeline port is reserved, and heat treatment is conducted. The water jacket is based on a multi-layer composite structure and has washing resistance, high heat conductivity and strong pressure bearing performance, and through the cooling water channels distributed in the heat transfer layer in a gradient mode, a dead water area is thoroughly eliminated, and the technical problem that a traditional cavity structure is uneven in cooling is solved.

The application discloses a three-dimensional orthogonal woven ablation-resistant and heat-insulating composite material and a preparation method thereof, and belongs to the field of functional composite materials. The three-dimensional orthogonal woven hybrid preform is prepared by adopting carbon fibers and alumina fibers as raw materials, a three-layer structure of carbon fibers-alumina fibers-carbon fibers, and alternately binding the three-layer structure by using normal yarns through a three-dimensional weaving process; then, a boron-modified phenolic resin matrix is used to realize the preparation of the three-dimensional orthogonal woven ablation-resistant and heat-insulating composite material through a resin transfer molding technology. The three-dimensional orthogonal woven ablation-resistant and heat-insulating composite material prepared by the application is ablation-resistant, heat-insulating, high in bearing capacity and low in density, and meets the requirements of structural lightweight, ablation resistance and heat-insulating performance of a super-speed aircraft.

The invention discloses a high-temperature-resistant metal casting demolding coating and a preparation method thereof, and belongs to the technical field of coatings. The components of the coating are optimized, the composite binder formed by compounding the organic binder and the inorganic binder is adopted, and the high-temperature-resistant auxiliary agent composed of the zirconite powder, the corundum powder and the nano cerium oxide is combined, so that the temperature tolerance of the coating is remarkably improved, and the service life of the coating is remarkably prolonged; the added hexagonal boron nitride can form a compact and smooth coating surface, the adhesion between a metal melt and a mold can be effectively reduced by combining the high-temperature-resistant auxiliary agents of different grades and utilizing the filling-supporting-lubricating synergistic effect and synergistic effect of particles of different sizes, and efficient and stable demolding performance is achieved; and the nano aluminum oxide can form chemical bonding with hexagonal boron nitride and the composite binder, so that the interface bonding force is further enhanced, the coating is prevented from being layered and peeled off under high-temperature impact, the thermal impact of molten metal on the mold is effectively buffered, and the service life of the mold is prolonged.

The utility model relates to the technical field of heat-shrinkable sleeves, in particular to a heat-shrinkable sleeve with corrosion resistance and high temperature resistance, which comprises a heat-shrinkable sleeve body, and an outer layer, a middle layer and an inner layer are sequentially compounded on the heat-shrinkable sleeve body from outside to inside. Meanwhile, the wear resistance and the temperature resistance of the outer layer are improved through the nano ceramic particles, the hot melt adhesive layer can be fused and bonded with the surface of the cable when the cable is heated and shrunk, the polytetrafluoroethylene film prevents a corrosive medium from permeating, and the double effects of corrosion prevention and sealing are achieved.

A PVC (polyvinyl chloride) floor with a miniature heat dissipation structure relates to the technical field of floors and comprises a bottom plate, a plurality of main grooves are uniformly formed in the upper surface of the bottom plate, branch grooves are formed between adjacent main grooves, and the adjacent main grooves are communicated through the branch grooves; the supporting part is located above the bottom plate and comprises auxiliary supporting layers and a supporting layer, and the auxiliary supporting layers are connected to the upper surface and the lower surface of the supporting layer correspondingly; the heat conduction part is located above the supporting part and comprises a buffer layer and a heat conduction layer, the heat conduction layer is located above the supporting part, and the buffer layer is located between the supporting part and the heat conduction layer; the wear-resistant layer is positioned above the heat conduction part; the main groove serves as a core airflow channel, the branch grooves form dense net-shaped branches, the heat dissipation area is further enlarged, cold air enters the main groove through the branch grooves and then is heated to rise, natural convection is formed, static heat conduction is converted into dynamic heat dissipation, and the heat dissipation efficiency is improved.

The invention provides a waterproof marine communication cable and a preparation method thereof, and belongs to the technical field of cable processing, the waterproof marine communication cable comprises a conductor and the following functional layers sequentially coating the conductor from inside to outside: a polyethylene composite insulating layer, a rubber composite waterproof layer, a modified filling layer, a compatible flame-retardant layer, a low-temperature toughening lining layer and a salt mist resistant outer sheath layer; the method comprises the following steps: respectively performing premixing and secondary blending granulation on raw materials of each functional layer, and then performing synchronous co-extrusion coating, vacuum filling compaction, hot-pressing compounding, layered coating, segmented cooling and performance testing, and screening to obtain a qualified cable. The marine communication cable effectively solves the problems of moisture invasion, interlayer stripping, structural deformation, low-temperature embrittlement, salt mist resistance, imbalance in flame retardance and the like of an existing marine communication cable, the comprehensive service performance and reliability of the cable are remarkably improved, and the marine communication cable adapts to the harsh use environment of a ship.

The invention discloses a tungsten diboride-based composite nano multilayer film as well as a preparation method and application thereof. The thin film comprises a chromium transition layer and a composite nanometer multilayer structure which are sequentially arranged on the surface of a base body in a stacked mode in the thickness direction of the thin film, the composite nanometer multilayer structure comprises a plurality of periodic units arranged in a stacked mode, and each periodic unit comprises a chromium carbide nanometer layer and a tungsten diboride-carbon nanometer layer. The preparation method comprises the following steps: depositing a chromium transition layer on the surface of a substrate by adopting a magnetron sputtering technology, sequentially laminating and depositing a chromium carbide nano layer and a tungsten diboride-carbon nano layer on the chromium transition layer to form periodic units, and repeatedly preparing a plurality of periodic units to prepare the thin film. The film has the advantages of high temperature resistance, extremely low friction, strong binding force and the like, and can be applied to substrate surface protection in an extreme environment.

The application belongs to the technical field of high polymer materials, and relates to an acrylic resin, an OCA layer composition and application. The acrylic resin is prepared by copolymerization of the following monomers: acrylic compounds, alkyl acrylate compounds, siloxane acrylate compounds, epoxy acrylate compounds, hydroxyalkyl acrylate compounds, styrene compounds and functional acrylate monomers. The OCA layer prepared from the acrylic resin has high transmittance, high flatness, strong adhesion, low dielectric constant and excellent aging resistance, and has good resistance to common solvents such as IPA, NMP, TMAH and DIW used in photoetching processes.