Production technology for easy-to-disperse polypropylene fiber

Abstract

The invention relates to a production technology for a polypropylene fiber which is excellent in dispersibility and hydrophilcity. According to the production technology, in a traditional polypropylene fiber production process, a direct doping or heating and rolling combined method is adopted to make mineral powder closely attached to the polypropylene fiber, so that the aim of improving the freediffusance of the polypropylene fiber is achieved, the fiber can be uniformly distributed after being mixed into mortar, and the crack resistance, the penetration resistance, the freezing resistance and other properties are better exerted.

Description

technical field [0001] The invention belongs to the technical field of polypropylene fiber production technology, and in particular relates to a production technology of easily dispersible polypropylene fiber. Background technique [0002] As early as the 1960s, foreign countries began to apply polypropylene fibers to the construction industry. A large number of experimental data and practical cases have proved that after mixing polypropylene fibers into mortar and mixing them uniformly, they will form a three-dimensional disordered distribution in the mortar. It inhibits the sinking of particles in the mortar, and can also play a role in transmitting stress inside it, bear the internal stress caused by factors such as plastic shrinkage, drying shrinkage and temperature changes inside the mortar, and prevent the occurrence and development of microcracks. It can also effectively improve its impermeability, impact resistance and freeze-thaw resistance. [0003] Polypropylene ...

AI Technical Summary

Problems solved by technology

[0004] Common surface modification methods of polypropylene fibers include: surface oxidation, grafting, and coating methods, among which: 1. The surface oxidation method is to use a strong oxidant to etch the surface of polypropylene fibers to roughen the surface to achieve modification 2. Most of the grafting methods use strong oxidants to treat the surface of polypropylene fibers, and graft polar groups such as hydroxyl groups and carboxyl groups on the surface of polypropylene molecules to improve their hydrophilicity and dispersibility; 3. The coating method is divided into physical and chemical coating. The physical method usually sprays hydrophilic materials such as polyether substances or surfactants on the surface of the fiber, but the modified fiber has higher requirements for the preservation environment; while the chemical method uses Sodium acrylate, calcium carbonate and polypropylene react chemically to coat calcium carbonate on the polypropylene fiber to increase the specific gravity and improve hydrophilicity and dispersibility, but the preparation steps are very cumbersome

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