86results about How to "Excellent preparation performance" patented technology

The invention discloses a method for preparing a hollow fiber nanofiltration membrane by using a thermally induced phase separation / interface cross linking synchronization method; the preparation method comprises the following steps: 1) mixing polymer, a diluting agent and a cross linking agent to form a homogeneous phase membrane casting solution; 2) extruding the membrane casting solution and core solution, or the membrane casting solution and nitrogen by a ring-shaped spinning head, then conducting the thermally induced phase separation in a cooling bath so as to obtain a hollow primary membrane; 3) soaking the hollow primary membrane in extracting solution containing cross linking pre-polymer, conducting the interface cross linking at the same time with removing diluting agent, thereby obtaining a hollow fiber nanofiltration membrane. According to the method provided by the invention, the preparations of holing and separation layer is finished, and the difficulty point of high require of bonding property between a separation layer and a supporting layer of a combining method in the prior art can be avoided, and meanwhile the thickness and the evenness of the separation layer are easy to control; the simple new method for preparing the hollow fiber nanofiltration membrane with excellent property by using the thermally induced phase separation / interface cross linking synchronization method is provided; and the prepared nanofiltration membrane is little in defect, high in stability and high in controllability.

The invention relates to a preparation method of a three-component composite fiber with high fuzzing and pilling resistance and high wear resistance. The method comprises the following steps: drying a slice A, a slice B and a slice C; correspondingly feeding the slices into corresponding screw extruders to smelt and extrude; then transferring into a spinning box body to spin through a spinning assembly; feeding melts of the slice A, the slice B and the slice C into corresponding spinning micropores; forming a smelt on the surface of a spinning plate in a smelt form; slowly cooling and coating with oil to obtain the three-component composite fiber. According to the method, a melt distributing plate is designed in an asymmetric melt running channel form; the spinning micropores in the spinning plate are three-leaf shaped; the micropore corresponding to each component is different in length to diameter ratio; a multi-oiling device is adopted for coating the oil; the fuzzing and pilling resistance level of a fabric prepared through the fiber is up to 5 level, and the wear resistance reaches more than two hundred thousand times; the fabric prepared through the fiber can be widely applied to the fields of middle-level and high-level one-piece trousers, one-piece socks, underwear, sports and leisure fabrics, fitness clothing, school uniforms, battle dress uniforms and training uniforms of army and armed police.