Low-damping polyamide negative pressure melt spinning formation method

Abstract

The invention relates to a low-damping polyamide negative pressure melt spinning formation method. A polyamide melting body squeezed out from a low-damping filament-sprinkling micro-hole is slow-cooled to form nascent fibers; then the nascent fibers are negative-pressure cooled and naturally cooled orderly; the low-damping filament-sprinkling micro-hole has low-surface energy and the surface is processed via polysilaxane processing liquid; the filament-sprinkling micro-hole surface energy En is no more than 35mJ / cm<2>; the surface roughness Ra is no more than 0.2[mu]m; the surface static contact angle WCA is no less than 85 degrees; and the negative pressure cooling is conducted in a sealed air atmosphere environment with constant temperature and isopiestic pressure and constant humidity, pressure of being 0.001 to 0.01 MPa and the temperature of 5 to 10 DEG C. flowing deformation resistance and air friction resistance produced during the flow of the melting body can be effectively reduced and fibers can be evenly and thoroughly cooled; spinning speed and fiber product quality can be obviously improved during the melt spinning; and the method can be applied to production and machining of fibers with rough denier, fine denier, high strength and great modulus.

Description

technical field [0001] The invention belongs to the field of melt spinning and relates to a low-damping polyamide negative pressure melt spinning forming method. Background technique [0002] China is a big country of chemical fiber, and chemical fiber is an important raw material in the textile field. In terms of chemical fiber output, China's chemical fiber output reached 43.9 million tons in 2014, of which polyamide fibers accounted for more than 70% of the total chemical fiber output. The transformation and upgrading of polyamide fiber products directly affects the development of the chemical fiber field, among which the main development trends in the transformation and upgrading of polyamide are production efficiency, energy saving and fiber quality improvement. The improvement of polyamide melt spinning technology has a significant role in promoting the transformation and upgrading of the chemical fiber field. [0003] The problems existing in the application process...

AI Technical Summary

Problems solved by technology

[0005] In the Chinese patent CN 102206879A, the negative pressure spinning condition (0.01-0.001MPa) is designed in the fiber forming process to improve the spinning speed of the fiber by reducing the air friction resistance, but the rheological resistance of the melt Lack of necessary considerations, and rheological resistance is one of the key factors for the improvement of fiber spinning speed and quality. The structure of the spinneret in the spinning pack has a direct impact on the rheological resistance of the melt, and then regulates the fiber forming process

However, neither the side blowing nor the surrounding blowing cooling method can avoid the disturbance of the fiber air flow, resulting in insufficient and uniform cooling during the cooling process.

Although the surrounding air blowing can ensure the cooling effect of the fiber to a certain extent compared with the side air blowing, and the quality index has been improved in the development of ultra-fine denier and fine-denier fibers, but there is no systematic design for the fiber-air boundary layer during the fiber cooling process.

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