38results about How to "Poor uniformity" patented technology

The invention discloses a process for optimizing the nickel-plated appearance of an ultra-wide stainless steel plate and belongs to the technical field of nickel plating. The process for optimizing the nickel-plated appearance of the ultra-wide stainless steel plate comprises the following steps: step 1, degreasing; step 2, immersion washing with hot water; step 3, washing with sulfuric acid; step4, spray washing with pure water; step 5, nickel pre-plating; step 6, corrective nickel plating; step 7: general nickel plating; step 8, cleaning and immersion washing; step 9, post-treatment; step 10, ultrasonic washing; step 11, blow-drying; step 12, oven-drying; and step 13, auxiliary collecting. By the adoption of the process, the nickel and phosphorus alloying process can be added between the pre-plating operation and the plating operation on a general nickel-plated layer; accordingly, not only can the plated layer deposition speed be improved, but also a lattice of the nickel-plated layer can be remarkably improved, the lattice being compact in structure can be refined, and the plated layer porosity can be reduced; and then, the appearance uniformity and glossiness of the general nickel-plated layer can be guaranteed, the plated layer density, uniformity and bonding strength can be improved, and the corrosion-resistant property can be improved.

The invention relates to a dressing method of a grinding pad. The grinding pad is dressed by using a dressing disc of a grinding pad dresser, wherein during the dressing of a grinding area, in the direction from the center of the grinding pad to the edge, the downward pressure exerted by the dressing disc on the grinding area gradually decreases, and the dressing degree of the grinding pad is different with different downward pressure. According to the dressing method of the grinding pad, the problem that the homogeneity of the grinding pad becomes poor after a period of grinding process in the existing CMP process can be improved, grinding liquid is advantageously and evenly distributed in a groove of the grinding pad, the grinding removal rate can be increased, and the service life of the grinding pad is prolonged.

The invention provides a production method of an industrial-grade potassium dihydrogen phosphate coproduced water-soluble fertilizer. The production method comprises the following steps: by taking wet-process phosphoric acid as a raw material, extracting high-purity nitrogen-phosphorus compound salt intermediate-urea phosphate from wet-process phosphoric acid, purifying the wet-process phosphoric acid, producing master liquor by utilizing the industrial-grade potassium dihydrogen phosphate, and preparing nitrogen-phosphorus-potassium ternary water-soluble fertilizer. Through continuous operation of a production device, high-nitrogen, high-phosphorus and high-potassium type water-soluble fertilizer having constant-quality and high-efficiency products and containing medium and trace elements in uniform and multiple formulas can be produced so as to meet different market demands, the raw materials for production are mainly wet-process phosphoric acid, urea and potassium hydroxide, the cost of the raw materials is low, the technological route is simple, and the industrial-grade potassium dihydrogen phosphate production technology can be effectively coupled.

The invention provides a jack assembly with a composite coating. The jack assembly comprises a jack and a contact spring coil, a blind hole is arranged at the butt joint end of the jack, and the contact spring coil is arranged in the blind hole. The contact spring coil is fixed in the blind hole by closing an opening of the blind hole, the contact spring coil is provided with a plurality of elastic spring claws, and the coating of the contact spring coil is a gold-graphene composite coating, and the plating layer of the jack is a gold plating layer or a gold-graphene composite plating layer. An electric connector is provided with the jack assembly. According to the jack assembly with the composite coating, the electric connector and an electroplating method of the jack assembly, the gold-graphene composite plating layer is electroplated on the contact spring coil, and the spring claw structure is optimized, so that the mechanical life of the jack assembly is prolonged, and the mechanical life of the electric connector is further prolonged.

The invention relates to a method for preparing a carbon fiber precursor, and mainly aims at solving the problems in the prior art that the carbon fiber precursor obtaining by spinning is low in strength and unstable in property caused by poor radial uniformity of properties of a spinning solution due to different radial temperatures in the transportation process. Through the technical scheme that the method for preparing the carbon fiber precursor comprises the following steps: polymerizing a first monomer acrylonitrile, a second monomer itaconic acid through the initiation of an initiator azodiisobutyronitrile in solvent dimethyl sulfoxide to obtain the spinning solution; carrying out vacuum removal on residual gas and bubbles in the spinning solution, and then filtering and mixing to obtain a high-property polyacrylonitrile copolymer spinning solution; and carrying out solidifying, drafting, washing, oiling, compacting by drying, steam drafting and steam heat setting on the spinning solution, and then rolling to obtain the carbon fiber precursor with high strength and stable performance, the problems are relatively well solved, and the method can be applied to industrial production of carbon fibers.

A method for preparing ultra-fine cobalt blue material at low temperature. First, three cobalt tetroxide, aluminum hydroxide, zinc oxide and chromium oxide are mixed according to the general chemical formula Co1-xZnxAl2-yCryO4 to obtain reactants, wherein 0≤x<1, 0≤y≤2; secondly, add one or more of KOH, NaOH, KCl, NaCl, Li2SO4, Na2SO4 to the reactant and mix evenly to obtain a mixture; finally, calcinate the mixture at 800°C-1000°C for 1 -2 hours, grind the calcined product finely, wash and filter. The technical process and equipment of the invention are simple, easy to operate, cheap and easy to obtain raw materials, and low cost of colorant preparation. The pigment obtained by the preparation method of the present invention has the characteristics of good grain development, good color development, fine particle size, light agglomeration, good uniformity, etc., and at the same time, the introduction of salt can reduce the synthesis temperature.

The invention provides a plug-resistant electrical connector, which includes a jack fitting and a base, the jack fitting is installed in the base, the jack fitting includes a jack, a contact coil, and the butt end of the jack is arranged There is a blind hole, the contact coil is installed in the blind hole, the blind hole is closed to fix the contact coil in the blind hole, the contact coil is provided with a number of elastic claws, and the coating of the contact coil is gold-graphene composite coating , the plating of the socket is gold plating or gold-graphene composite plating. The invention provides a plug-resistant electrical connector. By electroplating a gold-graphene composite coating on the contact coil and optimizing the spring claw structure, the mechanical life of the socket assembly is improved, and the electrical connector is further improved. mechanical life.

The invention relates to a rotary type developing device of an image forming device. The inside of a case 26 of a developing device 26 is isolated by an isolating member 28 while leaving a communicative path 27, a developer storage part 32 where the developer is temporarily stored and a developing part 33 where the developer fed through the communicative path 27 is stuck to a photoreceptor belt 1 are provided. Then, a plurality of developing units 23 consisting of the developing device and developer container are provided, and either one of the developing units 23 is selected by rotation and moved to a developing position to develop an electrostatic latent image formed on the photoreceptor belt. To prevent an image from being deteriorated in uniformity and being deteriorated due to surface soiling or the like by preventing toner from being stressed and stably feeding developer in a rotary type developing device of an image forming device.

The invention discloses an OLED anode, a manufacturing method thereof, and a manufacturing method of an OLED substrate. The manufacturing method of the OLED anode includes: forming a first conductive pattern; forming a reflective layer on the first conductive pattern by using a physical vapor deposition PVD process, the pressure of the PVD process is 0.8-1Pa, the power is 2-4kw, and the inert gas The flow rate is 100-150 sccm; a second conductive pattern is formed on the reflective layer. Based on this, the present invention can reduce the uniformity of crystal grain size in the reflective layer, increase the reflectivity of the reflective layer to visible light, and improve the luminous efficiency of the OLED panel.

The invention provides a double-helix device for recovering heavy metals from sludge by adopting an electrochemical removal method. The device comprises a helix-type electrochemical reactor, a cathode electrode, an anode electrode and an ion exchange membrane, wherein the helix-type electrochemical reactor is composed of an outer cylinder, a middle helix cylinder, an inner helix cylinder, a circular lower base plate, a helix-type opening upper base plate and a bracket; the area encircled by the inner helix cylinder and the circular lower base plate forms an anode chamber; the anode chamber is communicated with the area formed by the outer cylinder and the middle helix cylinder; the area formed by the upper layer inner helix cylinder, the middle helix cylinder and the helix-type opening upper base plate is a cathode chamber; the ion exchange membrane is adhered on the outer surfaces of the inner helix cylinder and the middle helix cylinder through a glass cement; a resource recovery pipe of the cathode chamber of the electrochemical reactor is positioned on the end plate of the cathode chamber; a feed pipe and a discharge pipe are symmetrically positioned on the outer side of the outer cylinder and are further connected with a booster pump. The double-helix device for recovering heavy metals from sludge by adopting the electrochemical removal method has the advantages of being good in economical efficiency, simple, and convenient and fast, high in processing efficiency and capable of separating and recycling heavy metals from sludge and the like.

The invention discloses a brand-new grape cultivation method, that is, the cultivation method of grape ridges and shallow planting with limited roots. On the ground to be planted, soil is piled up alternately to form ridges, and drainage ditches are opened on both sides of the soil ridges. Apply organic fertilizer on the surface of the ridge, and mix it with the soil to form a nutrient soil layer, and then plant grape seedlings on the nutrient soil layer. When planting the seedlings, they must be planted shallowly. Cover the organic fertilizer layer of 2 to 5 cm, and then cover a layer of straw on the organic fertilizer layer, lay the drip pipe in the middle of the straw, plant the grape seedlings in the middle of the soil ridge, the distance between plants is 1.5 to 2.5 meters, and the distance between rows is 2.5 to 3 meters, the dripping speed of the drip pipe ensures that the water content of the nutrient soil reaches 45% to 55%. Using this cultivation method, the grape seedlings can enter the full fruit period in only 15 months, and the growth of the canopy, the yield and quality of the fruit can be controlled artificially.