35results about How to "Improve the problem of easy falling off" patented technology

An anti-crack and oil-blocking redwood wood door is characterized in that the wood door comprises a door core made of the redwood, an inner coating coated on the outer surface of the door core, a middle coating coated on the inner coating and an outer coating coated on the middle coating. According to the redwood wood door, by coating the inner coating, the middle coating and the outer coating on the outer surface of the door core, on the premise that the clear visibility of the wood texture of the redwood is guaranteed, the anti-crack property is enhanced, and the problem that the coatings are prone to falling down is solved, the surface gloss of the redwood wood door is high, the middle coating effectively solves the problem that the interfaces of the inner coating and the outer coating are incompatible, meanwhile, the sound insulation effect is achieved. The redwood wood door is firm and can be used for a long time without deforming, and the service life is long.

The invention provides a preparation method of a tantalum 2.5 tungsten alloy. The preparation method comprises the following steps: after preparing tantalum powder and tungsten powder in proportion, putting the powder into a drum mixer to be mixed for 24 hours; sieving the mixed powder with a 120-mesh sieve to obtain fine powder; pressing the fine powder into an alloy bar with a 500ton oil press; putting the alloy bar into a vacuum sintering furnace to be sintered to obtain a raw ingot blank; smelting the raw ingot blank at least twice with a vacuum electron beam furnace to prepare an alloy ingot blank; putting the alloy ingot blank into a high frequency furnace to be heated to 1400 DEG C, then taking out the alloy ingot blank and forging the alloy ingot blank for many times, thus obtaining a finished product of ingot blank. The preparation method has the beneficial effects that through full mixing of tantalum powder and tungsten powder and many times of smelting, the problem of nonuniformity of ingot blank tissues is solved and the problems that the blanks easily fall off and become brittle are improved.

The invention discloses a conductive film replacing aluminum foil and a preparation method thereof. The conductive film replacing aluminum foil includes a metal layer, an intermediate reinforcing layer and a polymer film layer, and the intermediate reinforcing layer is arranged on both sides of the polymer film layer. , the metal layer is arranged on the outside of the middle reinforcing layer, the surface resistance of the conductive film is 10-80mΩ, the tensile strength is 150-350Mpa, the elongation at break is 75-150%, and the elastic modulus is 3500- 5500, the bonding force between the middle reinforcement layer and the metal layer is greater than 2N / 15mm, the bonding force between the polymer film layer and the middle reinforcement layer is 2‑4N / 15mm, and the water vapor transmission rate is <0.2g / (m 2 .24h), oxygen transmission rate <0.005cm 3 / (m 2 .24h). This conductive film that replaces aluminum foil can be made very light and thin, with a thickness of 3-20 microns. At the same time, the coating has a strong bonding force, is not easy to oxidize and fall off, has high barrier properties, good conductivity, and has light, thin, high strength and good toughness. Features, effectively solve the problems of high hardness and high tensile strength of pure aluminum foil, but small tear strength, easy to tear, high cost and heavy weight. It can be used to replace traditional aluminum foil in the fields of optical film, thermal protective coating, shielding film, high-end food / drug / cosmetic packaging with better barrier properties, electronic devices and batteries.

The invention discloses a drilling method of a thick copper circuit board and relates to the technical field of circuit board manufacturing. The drilling method uses a drill with the rotation speed of 20-30krmp, tool feeding speed of 20-30mm / s and tool retracting speed of 220-300mm / s to drill holes. The drill comprises a drill stem and a drill bit. The drill bit comprises a cutting blade and a chip groove. The chip groove is axially provided with a groove at the drilling end of the drill bit. The thickness of copper of the inner circuit of the circuit board is not smaller than 3OZ. The method has the advantages that the drill with the groove notch is used, the groove notch in the drilling end of the3 drill bit can cut off a drilling copper wire, the cut-off copper wire can be discharge timely through the groove during drilling, and problems such as hole blocking and drilling copper wire drawing are avoided.

A method for constructing an immobilized multi-enzyme system based on the interaction between DNA, graphene oxide and metal-organic framework materials belongs to the field of immobilized enzyme preparation. Steps of the present invention: first prepare metal-organic framework material PCN-222 nanoparticles and single-stranded DNA (ssDNA) functionalized glucose oxidase (GO X ) and horseradish peroxidase (HRP); followed by preparing a uniformly dispersed graphene oxide (GO) solution; then PCN‑222 nanoparticles, GO X ‑ssDNA complexes, HRP‑ssDNA complexes were incubated with GO solution; through the Janus particle properties of ssDNA, that is, the π‑π stacking effect of nucleic acid bases and GO aromatic domains and the coordination of phosphate backbones and metal zirconium clusters on PCN‑222 The function is to immobilize the dual enzymes on the dual carrier to construct an immobilized multi-enzyme system. The invention overcomes the problems of low adsorption efficiency and weak binding of traditional immobilized enzymes, and has simple preparation process and high cascade efficiency.

The invention discloses a preparation method of a cermet composite material. The method includes: (1) sequentially crushing the foamed SiC ceramics according to the procedures of primary crushing, secondary crushing and tertiary crushing, ultrasonic cleaning, and drying to obtain an ellipsoidal SiC ceramic block with a size of 2 mm-15 mm; (2) Pre-oxidize and pre-corrode the ellipsoidal SiC ceramic block obtained in step (1), and obtain a foamed SiC ceramic reinforcement after cleaning, (3) mix the foamed SiC ceramic reinforcement obtained in step (2) with metal, and put it into a mold , under nitrogen atmosphere, heating and applying pressure, lowering the temperature, solidifying, demolding, and polishing to obtain the metal-ceramic composite material.

The invention provides a square lithium-ion battery winding cell and a manufacturing method thereof. The square lithium-ion battery winding cell includes a positive electrode sheet, a separator and a negative electrode sheet, and the positive electrode sheet is provided with a positive electrode lug. The negative electrode sheet is provided with a negative electrode tab, and the center of the coiled cell of the square lithium ion battery is provided with an internal support frame. Adopting the technical solution of this invention, the problem of easy deformation of the pole piece in the charge-discharge cycle of the traditional square winding battery cell and the problem that the material is easy to fall off at the semicircular position of the pole piece bending are improved, and the square lithium ion is kept to the maximum extent. The consistency of the battery under static and charge-discharge cycle dynamics improves the production pass rate of winding cells and the safety of square lithium-ion batteries, creating conditions for the reliable application of square winding cells in the field of power batteries .

The invention provides a sensing apparatus. The sensing apparatus comprises a first signal sending / receiving layer, a second signal sending / receiving layer and a flexible circuit board. One end of the flexible circuit board is fixed to the lower part of the first signal sending / receiving layer and the second signal sending / receiving layer. The first signal sending / receiving layer comprises a first electrode and a second electrode which are arranged oppositely, and a first spacing layer located between the first electrode and the second electrode. The first spacing layer comprises a first surface and a second surface which are arranged oppositely; and the first electrode has an extending part extending to the second surface from the first surface of the first spacing layer. The second signal sending / receiving layer comprises a third electrode, a fourth electrode and a second spacing layer sandwiched between the third electrode and the fourth electrode. The sensing apparatus realizes signal transmission with an external system through the flexible circuit board. The sensing apparatus performs signal transmission through the flexible circuit board without an external wire, so that the overall structural strength of the apparatus is improved.

An aluminum substrate resistance welding screen making method for preventing photosensitive slurry from falling off comprises the following steps: (1) using double-sided adhesive to paste a PET protective film to each of the positions, corresponding to the running tracks at the two ends of a scraper, on the front of a screen mesh; (2) applying glue water to the positions, corresponding to the PET protective films, on the back of the screen mesh, and naturally drying the glue water for a period of time after glue water applying to make the PET protective films cured on the screen mesh; (3) before photosensitive slurry is applied, adding boiling oil water to the photosensitive slurry according to the ratio of 30ml boiling oil water to 1kg photosensitive slurry, manually stirring the boiling oil water and the photosensitive slurry, and letting the mixture stand for a period of time; (4) spray-coating a given photosensitive slurry applying position of the screen mesh with the photosensitive slurry added with boiling oil water; and (5) after the photosensitive slurry is applied, baking the screen in an oven for a period of time to make the photosensitive slurry cured on the screen mesh. By using the method, the problem that the photosensitive slurry on the mesh in the positions of the two ends of the scraper is easy to fall off is improved effectively, the product quality is improved, and the service life of the screen is increased.

The invention discloses a foot pad anti-falling structure. The foot pad anti-falling structure comprises a foot pad main body and an equipment base shell for placing the foot pad main body; and the foot pad main body is connected to the bottom of the equipment base shell through a tight connection reinforcing mechanism, and a gum layer is arranged between the top surface of the foot pad main bodyand the bottom of the equipment base shell. The foot pad anti-falling structure is convenient and reliable to assemble, a foot pad can be limited in the X direction, the Y direction and the Z direction through a mechanical mechanism and a local gum fixing mode, the foot pad is firmly installed at the bottom of the equipment base shell, it is guaranteed that the foot pad is used for a long time andnot prone to falling off, the problem that a foot pad at the bottom of equipment is prone to falling off is effectively solved, and the foot pad is prevented from falling off from the root position.

The invention discloses a semiconductor structure and a forming method thereof. The semiconductor structure comprises a substrate, wherein the surface of the substrate is provided with a groove. The groove is exposed out of the surface of a metal layer. A metal bump is positioned on the surface of the metal layer and on the partial surface of the substrate. The shape of the cross section of the metal bump is the same as the shape of the cross section of the groove. The vertical distances between the sidewalls of the metal bump and the sidewalls of the groove are the same. The metal bump in the semiconductor structure is not easy to break or fall off.

The invention discloses a preparation method of a reverse osmosis membrane modified by an oxidized graphene / polyvinyl alcohol coating. The preparation method comprises the following steps of: preparing a nascent reverse osmosis membrane in advance, then coating polyvinyl-alcohol crosslinking reaction liquid containing oxidized graphene on the nascent reverse osmosis membrane, and finally obtainingthe reverse osmosis membrane modified by the oxidized graphene / polyvinyl alcohol coating. The preparation method disclosed by the invention has the advantages that the oxidized graphene and serine are introduced into the polyvinyl alcohol coating to carry out modification on the polyvinyl alcohol coating, so that the problems of reduction of water flux and easy dropping of the polyvinyl alcohol coating of the reverse osmosis membrane modified by the polyvinyl alcohol coating can be improved.