High-strength low-contract polyphenylene sulfide filament and preparation method thereof

Abstract

The invention relates to high-strength low-contract polyphenylene sulfide (PPS) filament and a preparation method thereof. In the high-strength low-contract PPS filament, monofilament line density is 2-4 dtex, breaking strength is 4-6 cN / dtex, elongation at break is 15-20%, and dry heat contractibility rate (processing the filament for 30min at the temperature of 180 DEG C) is less than 5%. The preparation method includes drying and crystallizing PPS slices, melt-extruding, spinning, cooling, applying oil, and winding preliminarily; then adopting level 1 to level 3 drafting to obtain draft filament; and conducting heat setting processing on the draft filament, and obtaining the high-strength low-contract PPS filament, wherein the heat setting processing includes two steps of dynamic heat setting and static heat setting. The high-strength low-contract PPS filament fiber is high in manufacture yielding rate, even in fiber fineness and good in breaking strength, elongation at break, boiling water shrinkage and dry heat contractibility and is far better in comprehensive performance than the existing PPS filament products in the market.

Description

technical field [0001] The invention relates to a high-strength low-condensation polyphenylene sulfide filament and a preparation method thereof. Background technique [0002] Polyphenylene sulfide (PPS) fiber is one of the newly developed high-performance fibers in recent years. It is widely used in military, electronic, and industrial fields due to its excellent corrosion resistance and high temperature resistance. PPS fibers are mainly used for filter fabrics in industrial coal-fired boiler bag filter chambers. PPS fiber can be used for a long time under extremely harsh environmental conditions such as high temperature, high humidity and highly corrosive gases. Coal industrial boiler dust removal, waste incineration dust removal, etc., have high cost performance and good dust removal effect. After filtration, the dust emission concentration is generally reduced to 30mg / m 3 Below, even 10mg / m 3 Below, significantly lower than the national standard, the application of PP...

AI Technical Summary

Problems solved by technology

[0004] However, due to the unscientific drying process in the process of PPS production (the drying temperature is lower than the crystallization temperature of 120°C), the spinning temperature is too high (320°C or higher), the oil is used improperly, and the draft ratio is insufficient (generally About 3 times the draft), the heat setting time is too short (generally between 0.2 and 30s), and the spinning speed is too low (generally lower than 600m / min) and other factors, making the breaking strength of PPS filament products Insufficient, the problem of high dry heat shrinkage at high temperature, especially above 180 °C, has not been solved