Preparation method of polyoxymethylene crude fiber for toughening concrete

• Main Authors: XU DEGEN, YANG ZHIQIAN, YE GUANGDOU, LI LIN, ZHANG AIMIN, LIU JIAPING, ZHANG LIHUI, LYU JIN, LIU JIANZHONG, ZHOU TAO
• Format: Patent
• Language: English
• Published: 08.04.2015
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

The invention relates to a preparation method of a polyoxymethylene crude fiber for toughening concrete. The method comprises the following steps: (1) mixing polyoxymethylene resin, a modified nano filler, a water-soluble polymer pore-foaming agent and a high-performance fiber in a high-speed mixer, extruding and pelletizing, so as to obtain modified POM aggregates; and (2) spinning the modified POM aggregates in a twin-screw extruder, directly feeding to a cooling bath to cool and mold, washing in a hot water bath, removing a water-soluble polymer, carrying out hot stretching, carrying out secondary stretching after drying, carrying out heat setting, and finally cutting into staple fibers, so as to prepare polyoxymethylene crude fiber the surface of which has micropores, with the equivalent diameter being 0.1-1mm, the tensile strength being greater than or equal to 600MPa and the tensile modulus being greater than or equal to 6.5GPa. Nanoparticle-enhanced and fiber-enhanced synergistic reinforcing effects are adopted, so that the high-performance polyoxymethylene crude fiber is prepared by virtue of general crude fiber equipment.