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Method for preparing polyformaldehyde nascent fibers

A nascent fiber and polyoxymethylene technology, which is applied to complete sets of equipment for producing artificial threads, chemical characteristics of fibers, melt spinning methods, etc., can solve the problems of complex production industrial processes, high industrial production costs, and large production area. Good spinnability, reduction of crystallization rate, effect of inhibiting crystallization

Active Publication Date: 2015-12-23
TANGSHAN KAILUAN CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some POM spinning articles have been reported, the preparation process is relatively complicated.
At the same time, most of them use spinning-grade polyoxymethylene resin, whose dioxolane content is higher than that of ordinary polyoxymethylene resin, and the production process is more complicated. Currently, it is reported that fiber-grade polyoxymethylene resin is produced by Japan Polyplastics, and the price is relatively low. Ordinary polyoxymethylene resin is much higher
In addition, the existing production process is too complicated and the production area is too large, so many reports are limited to the initial stage or ideal stage of the laboratory, and cannot be further applied to industrial production or the cost is relatively high in the industrial production process

Method used

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  • Method for preparing polyformaldehyde nascent fibers
  • Method for preparing polyformaldehyde nascent fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]The polyoxymethylene resin has a melt index of 11 g / 10 min, and the mass percentage of o-cresol novolak epoxy resin is 1.0 wt.%, and it is dried at 90° C. for 6 hours. The resin pellets are melted and heated by the screw extruder, metered and distributed by the metering pump, and then sprayed out through the spinneret. The temperature of each section of the screw melt spinning: 60°C for the first zone, 210°C for the second zone, 200°C for the third zone, and 230°C for the head. °C, assembly 235 °C. After the melt stream is sprayed from the spinneret, it passes through the slow cooling-quick cooling device, and the total length of the slow cooling-quick cooling device is 1 / 3 of the total distance between the spinneret and the oiling device, and the first stage of slow cooling and heating The distance between the upper surface of the sleeve and the lower surface of the spinneret is 0mm, the length of the heating jacket is 200mm, and the heating temperature is 235°C; The t...

Embodiment 2

[0027] The polyoxymethylene resin has a melt index of 11 g / 10 min, and the mass percentage of o-cresol novolak epoxy resin is 1.0 wt.%, and it is dried at 90° C. for 6 hours. The resin pellets are melted and heated by the screw extruder, metered and distributed by the metering pump, and then sprayed out through the spinneret. The temperature of each section of the screw melt spinning: 60°C for the first zone, 210°C for the second zone, 200°C for the third zone, and 230°C for the head. °C, assembly 235 °C. After the melt stream is sprayed from the spinneret, it passes through the slow cooling-quick cooling device, and the total length of the slow cooling-quick cooling device is 1 / 3 of the total distance between the spinneret and the oiling device, and the first stage of slow cooling and heating The distance between the upper surface of the sleeve and the lower surface of the spinneret is 0mm, the length of the heating jacket is 200mm, and the heating temperature is 235°C; The ...

Embodiment 3

[0029] The polyoxymethylene resin has a melt index of 11 g / 10 min, and the mass percentage of o-cresol novolak epoxy resin is 1.0 wt.%, and it is dried at 90° C. for 6 hours. The resin pellets are melted and heated by the screw extruder, metered and distributed by the metering pump, and then sprayed out through the spinneret. The temperature of each section of the screw melt spinning: 60°C for the first zone, 210°C for the second zone, 200°C for the third zone, and 210°C for the head. ℃, module 220℃. After the melt stream is sprayed from the spinneret, it passes through the slow cooling-quick cooling device, and the total length of the slow cooling-quick cooling device is 1 / 3 of the total distance between the spinneret and the oiling device, and the first stage of slow cooling and heating The distance between the upper surface of the jacket and the lower surface of the spinneret is 0mm, the length of the heating jacket is 200mm, and the heating temperature is 220°C; The tempe...

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Abstract

The invention discloses a method for preparing polyformaldehyde nascent fibers. The method includes the specific steps that polyformaldehyde resin and a small amount of o-cresol formaldehyde epoxy resin are evenly mixed and then placed into a vacuum drying box to be dried; the dried mixed materials are heated and fused in a screw extruder; spinning is carried out through a spinning assembly, spun filaments pass through a stage-by-stage slow-cooling and shock-cooling device (please see a figure in the specification) and are naturally cooled, then oil applying clustering and winding are carried out, and the nascent fibers are obtained. By means of the preparing method, the crystallinity of polyformaldehyde is effectively inhibited, the crystallization speed of the polyformaldehyde is decreased, good spinnability is given to the polyformaldehyde resin, the defects of broken filaments, surface micropores and the like generated in the multi-rate stretching process of the fibers are reduced, finished fibers obtained after the nascent fibers are stored for a period of time and then subjected to hot-air slow pulling processing are excellent in performance, the implementing method is simple, and production cost is low.

Description

technical field [0001] The invention relates to a preparation method of polyoxymethylene primary fibers. What needs to be specially explained is that the present invention uses a step-by-step slow cooling-quick cooling device to reduce the surface defects of the obtained polyoxymethylene primary fibers, and then obtain high-performance finished fibers. Background technique [0002] Polyoxymethylene, also known as polyacetal, is an unbranched linear polymer with high density, high crystallinity, good mechanical properties, strong chemical resistance, and excellent comprehensive properties. According to the existing production method and its molecular chain structure, polyoxymethylene can be divided into two categories: homopolyoxymethylene and copolymerized polyoxymethylene. Homopolyoxymethylene is polymerized from paraformaldehyde, and the preparation process is simple, but its thermal stability is poor under heating conditions, the processing temperature range is narrow, an...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10D01D13/00D01D5/08
Inventor 王亚涛李建华杨大志金旺马小丰武德珍
Owner TANGSHAN KAILUAN CHEM TECH CO LTD
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