Polyoxymethylene fiber produced sewing thread
A technology of polyoxymethylene fiber and sewing thread, which is applied in the field of sewing thread, can solve problems such as limited use, and achieve the effect of sufficient sewing strength and excellent seamability
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[0016] The preparation method of the above-mentioned polyoxymethylene resin used in the present invention is not particularly limited. For example, when polyoxymethylene copolymers are used, cationic polymerization catalysts are generally used to make trioxane and cyclic ether compounds or cyclic condensation compounds as comonomers. Formaldehyde compound is obtained by bulk polymerization. As the polymerization device, known arbitrary devices such as batch type and continuous type can be used. The introduction ratio of the oxyalkylene unit represented by the above-mentioned general formula (1) can be adjusted according to the amount of the comonomer to be copolymerized, and the melt index (MI) can be adjusted according to the amount of the chain transfer agent used during the polymerization, such as methylal, etc. to adjust.
[0017] Cyclic ether compounds or cyclic formal compounds used as comonomers include: ethylene oxide, propylene oxide, butylene oxide, styrene oxide, o...
Embodiment 1～10
[0053] Use the polyoxymethylene copolymer (A-1~A-10) prepared by the above method to carry out melt plasticization through an extruder with a barrel setting temperature of 200 ° C, and weigh the plasticized molten resin with a gear pump, Melt spinning was carried out using a die with a nozzle temperature of 225° C. and 48 holes to obtain undrawn filaments. Next, the unstretched filaments are passed into a hot air heating furnace whose temperature is set at 138°C in another step, and stretched to 5 to 7 times to obtain 148dtex / 48 filaments (single filament: about 3dtex). Polyoxymethylene filament. In addition, a 650 T / m ground twist was applied to the obtained multifilaments in the S direction, and a 950 T / m double twist was applied to the three doubling yarns in the Z direction, and a sewing thread was obtained by doubling.
[0054] The evaluation results are shown in Table 1.
[0055] When polyoxymethylene copolymers A-7 to A-9 were used, filament breakage often occurred in...
Embodiment 11
[0057] Polyoxymethylene homopolymer (manufactured by Dupont, Delrin 500P) was melted and plasticized in an extruder with a cylinder setting temperature of 210°C, and the plasticized molten resin was weighed with a gear pump, and passed through a nozzle at a temperature of 225°C , 48-hole die head for melt spinning to obtain unstretched filaments. Next, the unstretched filaments are passed into a hot air heating furnace whose temperature is set to 140°C in other steps, and stretched to 5 to 7 times to obtain 148dtex / 48 filaments (single filament: about 3dtex). Polyoxymethylene filament. In both the melt spinning process and the drawing process, it is unstable, and filament breakage often occurs, and the processing stability and yield of the fiber are low. Using the stretched filaments obtained in a relatively stable state in a short period of time, apply a bottom twist of 650 T / m in the S direction as in the above-mentioned embodiment, apply a double twist of 950 T / m in the Z ...
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Abstract
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