60results about How to "Lower extrusion temperature" patented technology

The present invention provides an improved elastomeric composition that includes from about 0.01 to about 0.5 weight percent of a polyorganosiloxane or a combination of polyorganosiloxanes.

The invention discloses a hot-melt extrusion process for preparing an indometacin quick release preparation from multi-element auxiliary materials and belongs to the field of pharmacy. The method comprises the following steps of: crushing indometacin and medicinal auxiliary materials, and after screening the powder with a 60 to 120-mesh sieve, uniformly mixing the powder into a physical mixture; according to the melting points or the glass transition temperatures of the medicament and the auxiliary materials, setting the extrusion temperature of a double-screw hot melt extruder to be between 50 and 150 DEG C, after the extrusion temperature reaches the preset temperature, starting a screw, adding the prepared physical mixture into the extruder, and extruding the physical mixture into strips through the screw; and after crushing the strips, screening the powder with a 20 to 80-mesh sieve to obtain medicinal solid dispersoid particles or powder. The auxiliary materials comprise the following components in percentage by weight: 10 to 90 percent of polymer, 5 to 50 percent of plasticizer, 0 to 10 percent of lubricant, 0 to 5 percent of surfactant and 0 to 20 percent of disintegrant. A sugar alcohol with a relatively low softening point or melting point, and the like, serving as the plasticizer, is added into the polymer with a relatively high softening point or melting point so as to reduce the extrusion temperature and make the extrusion process easy. The prepared indometacin solid dispersoid has the characteristic of quickly dissolving out.

The invention relates to a low-density foamed thermoplastic polyurethane elastic body and a preparation process thereof, belonging to the technical fields of polyurethane elastic bodies and preparation processes of the polyurethane elastic bodies. The low-density foamed thermoplastic polyurethane elastic body comprises the following raw materials such as a macromolecular polyol, a chain extender,an isocyanate and an azo foaming agent in a weight ratio of (40-60): (8-11): (32-49): (3.5-6); and a production process comprises the following steps of: 1, metering, transporting and mixing the raw materials; 2, reacting and extruding; 3, underwater pelletizing; 4, vulcanizing; and 5, inspecting. The molecular structure of the low-density foamed thermoplastic polyurethane elastic body provided by the invention is formed by rigid chain segments obtained by reaction of the isocyanate and the chain extender and flexible chain segments obtained by reaction of the isocyanate and the macromolecular polyol in an alternate manner, has unique comprehensive properties, excellent characteristics such as high tension, high tensile force, high toughness and aging resistance and leading wear resistance and is a mature environmentally-friendly material.

The invention provides high-strength magnesium-lithium alloy and a preparation method thereof. Commercial pure Mg, commercial pure Li, commercial pure Zn, Mg-RY middle alloy are taken as materials; the high-strength magnesium-lithium alloy is prepared from the materials by mass percent: 4.5-5.5% of Li, 2.0-3.8% of RY, 0.2-1.0% of Zn, less than 0.03% of gross of inevitable Fe, Cu, Ni and Si impurities, and the balance of Mg in a mixing manner according to the ratio. The preparation method comprises the steps of: based on commercial pure Mg, commercial pure Li, commercial pure Zn, Mg-RY middle alloy as materials, mixing the following components in percentage by mass: 4.5-5.5% of Li, 2.0-3.8% of RY, 0.2-1.0% of Zn, less than 0.03% of gross of inevitable Fe, Cu, Ni and Si impurities, and the balance of Mg; smelting in a vacuum induction smelting furnace, wherein the inside of the furnace is vacuumized before smelting, and then aerating argon is aerated to protect, the smelting process is carried out under protection of argon atmosphere, and the smelting temperature is 660-750 DEG C; casting the smelted melt into a metal die to obtain as-cast alloy; carrying out hot extrusion for at least twice to obtain the high-strength magnesium-lithium alloy. The obtained alloy disclosed by the invention has high strength and good plasticity; the tensile strength at room temperature is 220-260 MPa; the yield strength is 180-220MPa; the elongation percentage is 15-25%.

The present invention provides an improved elastomeric composition that includes from about 0.01 to about 0.5 weight percent of a polyorganosiloxane or a combination of polyorganosiloxanes.