5results about How to "Dense surface" patented technology

The utility model provides a rolling device of plastic extrusion production line, including: rolling device, clamping device and conveying device, rolling device includes: rolling frame, servo motor, hold-down mechanism and rolling mechanism, servo motor is on rolling frame, servo motor output end installs rolling mechanism, rolling mechanism can be rotatingly installed on rolling frame, the rolling mechanism is equipped with the clamping device, the clamping device is equipped with the conveying device. A conveying device is arranged on one side of the winding frame and comprises a guide rail, a movable bearing device, a blocking mechanism and an upward guiding assembly, a clamping device is installed above the movable bearing device and comprises a base, an installation rod and a supporting clamping mechanism, and the base is connected with the top of the movable bearing device through the installation rod. According to the winding device of the plastic extrusion production line, the accurate clamping action is achieved through the linkage shaft and the clamping arms, the opening and closing state of the clamping arms can be conveniently and rapidly adjusted through the design of the telescopic adjusting rods, and therefore plastic rolls are efficiently grabbed and released, and the stability of the plastic rolls in the transferring process is guaranteed.

The invention relates to the technical field of damping materials, in particular to a core-shell structure foaming agent with ammonium bicarbonate coated with nano-silica and a water-based damping coating prepared from the core-shell structure foaming agent. The foaming agent with the core-shell structure is prepared from the following raw materials in parts by weight: 8-10 parts of nano silicon dioxide, 2-5 parts of ammonium bicarbonate, 1-3 parts of diatomite, 1-2 parts of a coupling agent, 0.5-1 part of polyvinylpyrrolidone, 0.5-1 part of epoxy chloropropane and 7-12 parts of absolute ethyl alcohol. The foaming agent with the core-shell structure realizes controllable thermal decomposition through a synergistic effect of chemical bonding and physical adsorption, and the water-based damping paint prepared by utilizing the foaming agent effectively avoids the defects of bubbles, pinholes or cracks and the like caused by concentrated release of gas in a film forming process of a coating due to a controllable and stable gas release mechanism; the high-quality coating which is smooth and compact in surface, free of bubble marks and excellent in damping vibration attenuation effect is obtained, and it is hopeful to achieve the same or better vibration attenuation effect by reducing the overall using amount of materials.

This application relates to the field of concrete technology, specifically disclosing a fair-faced concrete and its preparation method. The raw materials for fair-faced concrete include cement, fly ash, mineral powder, glass powder, sand, reinforcing coarse aggregate, water, water-reducing agent, defoamer, and pumping agent; the preparation method is as follows: (1) cement, fly ash, mineral powder, glass powder, sand, and reinforcing coarse aggregate are added to a mixer and mixed evenly; (2) water, water-reducing agent, defoamer, and pumping agent are added to the mixer and mixed evenly to obtain fair-faced concrete. The fair-faced concrete of this application has the characteristics of high strength and high fluidity. Therefore, the vibration step is omitted during the construction and pouring process, greatly shortening the construction cycle, reducing the possibility of operational errors, and reducing rework costs.

In the field of electrode construction in the alkaline water electrolysis hydrogen production industry, a catalytic electrode prepared by an existing method has the problems of poor activity, poor stability and the like. The invention discloses a preparation method of an alkaline water hydrogen evolution electrode with flat and compact surface appearance. The method comprises the following steps: (1) preparing a compact catalyst precursor on the surface of a current collector in a pulse electroplating manner; (2) densification treatment; (3) constructing an active substance catalytic layer by electrochemical ultrashort pulse; and (4) carrying out secondary annealing to finally prepare the high-activity and high-stability electrolytic water gassing catalytic electrode.

The application relates to the technical field of ceramic materials, and discloses a preparation method of a high-temperature ablation-resistant (Hf-Zr-Nb)C ternary carbide entropy ceramic. First, HfO2, ZrO2, Nb2O5 and C powder are mixed and then heat-treated in a high-temperature heat treatment furnace to prepare (Hf-Zr-Nb)C entropy ceramic powder by using a carbothermic reduction reaction; then the powder is pressed to obtain a ceramic block; finally, the ceramic block is sintered by using a pressureless sintering device to obtain the (Hf-Zr-Nb)C ternary carbide entropy ceramic. Compared with the existing precursor impregnation and pyrolysis and discharge plasma sintering densification technology, the pressureless sintering technology is simple in process, can greatly reduce the production cost, and can improve the yield. The entropy carbide ceramic block has good ablation resistance. The application provides technical support for the application of the high-temperature ablation-resistant entropy carbide ceramic material to the hot end components of space-aircraft.