Method for manufacturing a polyester yarn
A technology of polyester fiber and polyester chips, applied in the field of polyester fiber, can solve the problems of high stiffness, low flexibility and foldability, passenger impact, etc., and achieve excellent toughness, reduced stiffness, and high gas barrier performance Effect
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Embodiment 1-5
[0112] Under the conditions described in Table 1 below, at a molar ratio (AA / TPA) of adipic acid (AA) to terephthalic acid (TPA) of 0.02 to 0.12, and ethylene glycol (EG) and dicarboxylic acid The molar ratio [EG / (TPA+AA)] of the components was 1.3. The esterification reaction was carried out at 285 to 292° C. for 4 hours. After the esterification reaction, the prepared oligomer was polycondensed at 284 to 290° C. for 3 hours and 30 minutes to obtain a polymer.
[0113] Polyester polymers (chips) prepared by polycondensation were cut in water using an underwater cutter to produce spherical particle forms such as beads.
[0114] Since the prepared polyester polymer (chip) is prepared into a spherical shape, no blocking will occur when solid-state polymerization is carried out. Therefore, compared with the solid-state polymerization of existing copolymers, the solid-state polymerization temperature can be increased. Here, at 235 Solid state polymerization was carried out for an...
Embodiment 6 to 10
[0124]The ethylene glycol (EG) and dicarboxylic The esterification reaction was carried out at 282 to 288°C for 4 hours at a molar ratio [EG / (TPA++iso-PA)] of 1.3. After the esterification reaction, the prepared oligomer was polycondensed at 288 to 292° C. for 3.5 hours to obtain a polymer.
[0125] Then, the polyester polymer (chip) prepared by polycondensation was subjected to an additional solid-state polymerization reaction at 217°C to 220°C for 24 to 28 hours to obtain solid-state polymerized polyester chips with an intrinsic viscosity (IV) of 1.2 dl / g.
[0126] pass figure 2 Melt spinning and drawing shown to prepare polyester fibers for airbags from solid-state polymerized polyester chips.
[0127] Specifically, solid-state polymerized polyester chips are melt-spun at a temperature of 288° C., and the molten polyester is discharged through a spinning nozzle, and the discharged molten polyester is passed through a tube consisting of a mantle heater and a heat shield...
preparation example 1 to 10
[0188] Using a rapier loom (warp x weft: 41 rapier to 49 rapier), weave a raw material fabric for an airbag from the polyester fiber prepared according to Examples 1 to 10, and prepare an airbag fabric through refining and tentering processes . Then, use the roller lining doctor blade roller coating method to 20g / m 2 A coating amount of polyvinyl chloride (PVC) resin was coated on the fabric to obtain a PVC-coated fabric.
[0189] Other conditions are according to the usual conditions for the preparation of polyester fabrics.
[0190] The physical properties of the prepared polyester fabric for an air bag were measured using the following methods, the results of which are summarized in Tables 9 and 10 below.
[0191] (a) Tensile strength and elongation at break
[0192] According to ASTM D5034 (standard of the American Society for Testing and Materials), a fabric sample was cut from the fabric for an airbag and fixed to the lower jaw of an apparatus for measuring tensile st...
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