JP2018168518A5 - - Google Patents

Description

However, when inorganic fine particles such as stannic oxide doped with antimony oxide are blended as in Patent Documents 1 and 2 in order to obtain sufficient heat retention, the specific gravity of the fiber increases, and the cold clothing and the like feel heavy. it easily becomes a certain clothing.
Further, the hollow fiber of polyethylene terephthalate as described in the examples of Patent Document 3 has a high specific gravity of 1.38 for polyethylene terephthalate, and the hollow ratio is increased in order to improve lightness, but the hollow ratio is high. However, since the hollow portion is cracked or crushed in a process such as false twisting or twisting, there is a limit to the provision of light weight.
Accordingly, the object is to obtain a dyeable heat-retaining heat-retaining fiber that has sufficient heat-retaining properties as a cold clothing and is lightweight.

Examples of the infrared absorber include antimony-doped tin oxide (ATO) and tin-doped indium oxide (ITO). In the case of ATO , it is preferable to contain 2 mass% or more and 15 mass% or less with respect to polypropylene resin. Can not content to obtain sufficient heat storage insulation is less than 2 mass%, 15 mass% of spinnability at the time is exceeded and the spinning to extremely deteriorate. Alternatively, even if possible spinning occurs yarn breakage in the stretching step, further, it has easily become shall not be able to satisfy quality after stretching. More preferably, it is 3 mass% or more and 12 mass% or less. Also in the case of ITO , it is preferable to contain in a polypropylene resin in the same ratio as ATO .

The particle size of the infrared absorber is preferably, for example, an average particle size of 10 μm or less. Average the particle diameter exceeds 10μm clogging of the spinning filter, yarn breakage or the like occurs easily Kunar. More preferably, they are 10 nm or more and 5 micrometers or less, More preferably, they are 10 nm or more and 3 micrometers or less.

[Example 1]
Polypropylene resin (“SA01A” manufactured by Nippon Polypro Co., Ltd., MFR 9 g / 10 min, melting point 164 ° C.) with 4 mass% of antimony-doped tin oxide (ATO) as an infrared absorber added to the island component, polyethylene terephthalate (melting point) 258 ° C) is used as a sea component, and the sea area: island area ratio is 40:60. As shown in FIG. 1, 19 island components are spun at 288 ° C. from a base disposed at the center of the fiber. It was taken out and drawn at a draw ratio of 2.7 times, and wound at a speed of 3000 m / min to obtain 67 dtex / 24 f of heat storage and heat retaining fiber. The minimum thickness of the sea part in the fiber cross section of the obtained heat-retaining and heat-retaining fiber was 1.2 μm, and no peeling at the interface between the sea part and the island part was observed, and the yarn production stability was good. Even after a dry heat treatment at 170 ° C. for 1 minute, there was no fusion and fusing, and the heat resistance was excellent. The dyeability was excellent in lightness with no whitening phenomenon and density of 1.115 g / cm ³ . Further, in the heat storage thermal insulation evaluated in comparison with a reference dough obtained by using the composite fibers prepared by the same method as in Example 1 except for using a polypropylene resin without added ATO to the island component, irradiated 10 The heat storage heat retention was excellent at + 5.5 ° C. after 1 minute and + 5.2 ° C. after 1 minute from extinction. The obtained results are shown in Table 1.