Production technique of fibre for high-strength low-extention polypropylene rope

Abstract

The invention relates to the production process of the fiber used for high-strength and low-extension polypropylene rope, which is mainly applied in the aspects of preparing high-strength ropes, project reinforcement, etc. The invention is a high-strength and low-extension modified polypropylene fiber, comprising interpolymer modified from polypropylene raw material, the adjusting screw of a twin screw extruding machine, the length-diameter ratio of which is increased, a mixing device added at the plasticizing section of the screw and a high pressure spray; after having been sprayed under high pressure, shockchilling is carried out immediately to enhance the monofilament crystallinity of the fiber; a high-temperature oil bath stretching leads the fiber molecular chain to be extended in symmetrical arrangement; a high-temperature steam stretching leads the polypropylene fiber molecular chain to be stretched fully and arranged evenly with high-strength and low-extension; the synnema of a multifilament twisting is encircled as the product fiber. The total denier of the gained high-strength and low-extension polypropylene twisting fiber of the invention is of 5000 deniers to 30000 deniers differently, the fiber strength is 8g / denier to 15 g / denier, and the fiber extensibility is 5% to 8%.

Description

Technical field [0001] The invention relates to a high-strength, low-elongation modified polypropylene fiber used in the preparation of high-strength ropes and engineering reinforcement and reinforcement, and a production method thereof. Background technique [0002] The production of polypropylene fiber began in the 1970s and it accounts for a large proportion of the total chemical fiber in the country. The well-known products mainly include: polypropylene filament, polypropylene staple fiber, polypropylene tobacco tow and polypropylene concrete reinforcement fiber. Its production technology and application status are as follows: [0003] 1) In the production of propylene filament, polypropylene is firstly extruded and melted by a screw, cooled and crystallized by side blowing, and then pre-drawn into a coil, and then drawn by two hot plates, and then surrounded into a coil of polypropylene filament. Product specifications are: 75D ~ 800D, the strength is generally between 3.5 g...

AI Technical Summary

Problems solved by technology

[0007] Existing polypropylene fibers have defects such as low production strength, high elongation, and no UV resistance, and are not suitable for use in high-strength cables and construction engineering reinforcements.

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