Method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding
A polypropylene fiber and polypropylene resin technology is applied in the field of skin-core composite preparation of fine denier dyeable polypropylene fibers, which can solve the problems of spinning performance and mechanical properties decline, improve spinning processing performance, reduce melting point difference, cost reduction effect
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[0016] Example 1
[0017] The method for preparing fine-denier dyeable polypropylene fiber by sheath-core composite of this embodiment includes the following steps: 1) Firstly, through a combination of melt polycondensation and solid-phase polycondensation, terephthalic acid and ethylene glycol are used as raw materials , The molar ratio of terephthalic acid to ethylene glycol is 1:1.2; adipic acid which accounts for 30% of the molar percentage of terephthalic acid and 1,4 which accounts for 30% of the molar percentage of terephthalic acid are added -Butylene glycol, to synthesize a copolyester with a melting point of 180°C and an intrinsic viscosity of 0.4dl / g; then, the copolyester is subjected to solid phase polycondensation at 170°C and a vacuum degree of less than 1kpa for 36 hours to further improve the characteristics The copolyester additive whose viscosity is increased to 0.8dl / g and the melting point is 180℃; 2) The intrinsic viscosity of 5% of the total weight of the a...
Example Embodiment
[0019] Example 2
[0020] The preparation steps of this embodiment are basically the same as those of embodiment 1, except that: 10% of the total weight percentage of additives, compatibilizers and polypropylene resins are copolyester with an intrinsic viscosity of 0.8dl / g, additives, EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene resin with a melt index of 50g / 10min are blended and pelletized by a twin-screw extruder at 200°C to prepare a dyeable dye containing additives Modified polypropylene resin, the average particle size of the dispersed phase measured is 0.92μm. See Table 1, which is the preparation process and result display table of the dyeable modified polypropylene resin in the embodiment of the present invention. The weight ratio of the skin layer to the core layer is 30:70. The skin-core composite fine-denier dyeable polypropylene fiber (110dtex / 144f pre-oriented yarn (POY)) was prepared. After POY t...
Example Embodiment
[0022] Example 3
[0023] The preparation steps of this embodiment are basically the same as those of embodiment 1, except that: 15% of the total weight percentage of additives, compatibilizers, and polypropylene resin are copolyester with an intrinsic viscosity of 0.8dl / g, and additives, EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene resin with a melt index of 50g / 10min are blended and pelletized by a twin-screw extruder at 220°C to prepare a dyeable dye containing additives Modified polypropylene resin, the average particle size of the dispersed phase measured is 0.98μm. See Table 1, which is the preparation process and result display table of the dyeable modified polypropylene resin in the embodiment of the present invention. The weight ratio of the skin layer to the core layer is 50:50. The skin-core composite fine-denier dyeable polypropylene fiber (110dtex / 144f pre-oriented yarn (POY)) was prepared. After P...
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