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Method for preparing low density polypropylene foam section or beads by two-step extrusion molding

The invention discloses a method for a preparing low density polypropylene foam section or beads by two-step extrusion molding, which comprises the following steps that: expandable master batch is prepared from 30 to 80 portions of polypropylene, 10 to 40 portions of foaming agent, 0 to 15 portions of foaming accelerant, 0 to15 portions of dispersant and 0 to 10 portions of nucleating agent at a temperature below the decomposition temperature of the foaming agent and above a viscous flow temperature of the polypropylene; 20 to 99 portions of polypropylene with high melt strength, 0 to 70 portions of common polypropylene and 1 to 10 portions of expandable master batch are plasticizated and extruded together; supercritical gas is added to perform the blending of the plasticizated and extruded mixture; and the product obtained is made to generate foamcores in a foaming nucleation apparatus to form the section or beads finally. A chemical foaming agent is partially decomposed and foamed during the plasticization and extrusion, so that the viscosity of fused mass is reduced, the dissolution and dispersion of the supercritical gas are facilitated, and a problem that a foam imploding is likely to happen in a secondary forming process so as to influence the quality and appearance of secondarily formed product is solved as the chemical foaming agent retained in molding beads can be decomposed and foamed again during the secondary processing.
Owner:SICHUAN UNIV

Photovoltaic high-voltage and direct-current series grid-connected system comprising dynamic voltage compensator

The invention provides a photovoltaic high-voltage and direct-current series grid-connected system comprising a dynamic voltage compensator. The photovoltaic high-voltage and direct-current series grid-connected system comprises a plurality of photovoltaic direct-current grid-connected inverters and at least one dynamic voltage compensator, wherein input ends of the plurality of photovoltaic direct-current grid-connected inverters are independent and output ends are connected in series; the input ends of the plurality of photovoltaic direct-current grid-connected inverters are connected with a photovoltaic module respectively; and the output ends of the plurality of photovoltaic direct-current grid-connected inverters are connected in series and are connected with the input end of the dynamic voltage compensator in series. Through coordination and cooperation of the dynamic voltage compensator and the photovoltaic direct-current grid-connected inverters, the probability that the photovoltaic direct-current grid-connected inverters enter a power limiting mode; the generating capacity of the photovoltaic system is improved; and output voltage exceeding of the photovoltaic direct-current grid-connected inverters caused by power fluctuation of the photovoltaic module is overcome.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Silver-loaded antibacterial artificial joint and preparation method thereof

The invention relates to a silver-loaded antibacterial artificial joint and a preparation method thereof. The silver-loaded antibacterial artificial joint consists of a pure titanium or titanium alloy artificial joint substrate and a micropore sodium titanate bioactivity layer loaded with microelement silver and bone morphogenetic protein (BMP). The sodium titanate bioactivity layer with a micropore structure is combined with the metal substrate surface and is formed by mutually alternately stacking the sodium titanate micropore sodium structures generated by the hydro-thermal reaction between the titanium or titanium alloy substrate surface and sodium hydroxide solution. The silver element and sodium carry out cation exchange to dope into a coating. The BMP is compounded in the micropore structures under the action of the centrifugal force and the capillary. The preparation method comprises the following steps: firstly selecting pure titanium or titanium alloy to process the artificial joint; then adopting the alkaline hydrothermal synthesis technology obtain a sodium titanate layer with the micropore structures on the surface of the titanium artificial joint; doping trace silver in the micropore sodium titanate layer by solution impregnation iron exchange; and finally adopting the centrifugal load technology to load the bone morphogenetic protein in the silver-doped micropore sodium titanate layer.
Owner:江苏广达医材集团有限公司 +1
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