Process for preparing fibers, fibers and yarns made from such fibers
A fiber and fiber-forming technology, which is applied in the field of preparing fibers containing polyethylene-2,5-furandicarboxylate, and can solve problems such as not providing fiber parameters
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Embodiment 1
[0041] A sample of polyethylene-2,5-furandicarboxylate (hereinafter referred to as "PEF") having a weight-average molecular weight Mw of 75,600 (corresponding to an intrinsic viscosity of 0.74 dl / g) was passed through 48°C at a temperature of 260°C. - Orifice spinneret melt spinning, the weight average molecular weight of which is determined by GPC using polystyrene standard substances. Cool the melt and spin. 48 filaments were combined into a yarn having a linear density of 115 tex, corresponding to a linear density of 2.40 tex / filament. The fracture toughness was 96 mN / tex and the elongation to break was 239% (both determined according to ISO 5079-1995). The yarn is stretched (drawn) to different draw ratios at different draw temperatures as spinning. The yarn had an IV of 0.67 dl / g, corresponding to a weight average molecular weight of 66,400. The resulting linear density / filament, fracture tenacity and elongation at break are shown in Table 1 below.
[0042] Table 1
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Embodiment 2
[0046] The same polymer used in Example 1 was subjected to a two-step stretching (stretching) process. First, the polymer composition was melt-spun in the same manner as in Example 1. The resulting yarn was then preliminarily drawn at 85°C to a draw ratio of 2.5. In the second stage, the initially drawn fibers are further drawn to different final draw ratios in an oven heated to 125°C or 130°C. Tenacity and elongation were again determined for each of the resulting yarns. The results are shown in Table 2.
[0047] Table 2
[0048]
[0049]
[0050] The results show that after the first stretching step at a relatively low temperature, a second step at a higher temperature can be carried out, wherein said temperature change in the second step in the region of 125°C to 130°C is hardly effective. effect.
Embodiment 3
[0052] The same polymer used in Example 2 was used and melt spun in the same manner. In a first step, the spun fiber was drawn at 90°C to a first draw ratio of 2.4. The initially drawn fibers were then passed over a hot plate maintained at 100°C and further drawn to a final draw ratio in the range of 3 to 3.6. Table 3 shows the results of these tests.
[0053] table 3
[0054]
[0055] The results show that the tenacity of the resulting fibers increases when the stretching temperature in the second step is also at most 100°C. The yarn exhibits a melting point of 204°C-210°C. Yarn of Run No. 23 had a crystallinity of 14 J / g as determined by differential scanning calorimetry (DSC) from the net enthalpy of fusion. The crystallinity of the yarn of test number 26 was 30 J / g.
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