JPH02160921A - Far infrared ray emitting polyester staple fiber - Google Patents

Abstract

PURPOSE:To obtain the subject fiber, consisting of a polyester polymer containing far infrared ray emitting ceramic particles with specific particle diameter in a specified proportion, having a hollow cross-sectional shape without falling off ceramic particles, excellent in bulkiness and suitable as coverlet for 'KOTATSU' (foot warmer). CONSTITUTION:The objective fiber, having a hollow cross-sectional shape and consisting of a polyester polymer containing 1-15wt.% far infrared ray emitting ceramic particles, selected from alumina, magnesia and zirconia and having about 0.1-1.5mum average particle diameter. Sericite, etc., are preferred as the above-mentioned far infrared ray emitting ceramic particles and polyethylene terephthalate is preferred as the polyester polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polyester staple μ fiber having a hollow cross-sectional shape and having far-infrared radiation.

[Conventional technology]

Many methods have been proposed for using far infrared rays on textile materials, one of which is post-processing;
Publication No. 239543 discloses coating the surface of fibers with far-infrared emissive ceramic powder.
Furthermore, Japanese Utility Model Application No. 62-197552 discloses applying far-infrared emissive ceramic powder to cloth, but these methods have drawbacks such as high processing costs and the tendency for ceramics on the fiber surface to fall off. It had

The other method is based on composite spinning, which was disclosed in Japanese Patent Application Laid-open No. 62
JP-A-238823 discloses that ceramic powder is used as the material for the core of the core-sheath composite fiber, and a polymer such as nylon is used as the material for the sheath. It has been shown that polymers containing particles that emit far-infrared rays are placed in each type, but since they are all kneaded type, the particles do not fall off, the effect is semi-permanent, and they have excellent washing resistance. . However, the main use of Staple μ is in the interior bedding field.
There is no need to take the example of a kotatsu futon (bulkness is particularly important, but core-sheath composite fibers have a fatal drawback of not being able to exhibit bulkiness).

[Problem to be solved by the invention]

The present invention solves the above-mentioned conventional problems and provides a polyester staple fiber that does not cause shedding of ceramic particles and has far-infrared radiation and is bulky.

[Means to solve the problem]

The present invention is directed to a far-infrared emitting polyester staple fiber having a hollow cross-sectional shape and made of a polyester polymer containing 1 to 15 wt % of at least one far-infrared emitting ceramic particle selected from the group of alumina, magnesia, and zirconia.

As the far-infrared emitting ceramic particles used in the present invention, for example, sericite is preferably mentioned. Sericite is basic potassium aluminum silicate (K, 0
-3A40s-ilo, -2H,0) and is in the form of a white powder, and its particle size is preferably 0.1 to 1.5 μm. If the particle size is less than 0.1 μm, particle aggregation is not likely to occur, and filter clogging occurs during spinning, resulting in poor spinning performance.

On the other hand, if the particle size exceeds 1.5 μm, the particle size itself becomes an obstacle, causing filter clogging during spinning and causing problems such as pressure increase.

The content of secondary ceramic particles in the polyester polymer is preferably 1 to 15 wt%.

If the content is less than 1 wt, there is no particular problem in fiber production, but the far-infrared radiation effect becomes small and the characteristic functions cannot be exhibited.

On the other hand, if the content exceeds 15 wt%, the far-infrared radiation effect is expected to increase, but the spinnability during spinning becomes poor and stable spinning becomes impossible.

The polyester polymer used in the present invention refers to ordinary fiber-forming polyesters, and is not particularly limited.
For example, polyethylene terephthalate containing terephthalic acid or its ester as the main dicarboxylic acid component and ethyl V glycol μ as the main glycol component is preferred.

A part of this dicarboxylic acid component may be replaced with a dicarboxylic acid such as adipic acid or sepacic acid or an ester thereof, or an oxycarboxylic acid such as p-oxybenzoic acid or p-β-oxyethoxybenzoic acid or an ester thereof. Often, a part of the glyco-μ component may be substituted with, for example, tetramethylene glycol, 1,4-bis(β-oxyethoxy)benzene, bisphenol/L'A bisglycol ether,
Glyco-μ such as polyalkylene glycol can also be substituted.

In the present invention, methods for kneading ceramic particles with far-infrared radiation into a polyester polymer include adding the ceramic particles during the polymerization process of the polyester polymer, forming a masterbatch and then kneading it with the polyester polymer, and adding the ceramic particles to the polyester polymer in advance. a dispersant that is compatible with the polyester polymer that melts with the polymer;
There are methods of kneading and dispersing the composition by mixing it with a plasticizer and the like and adding it to the polyester fiber F before the extruder, or adding it to the molten polymer just before spinning.

Polyester staple fibers exhibit excellent heat retention properties, making them particularly useful for applications such as kotatsu futons, and they are also required to have bulk as another characteristic.
Preferably, the cross-sectional shape of the fiber is a hollow cross-sectional shape.

Figures 1 (a) and (b) are cross-sectional views of examples of stable fibers of the present invention, where A is a ceramic particle-containing polymer B is a hollow part,
C indicates a polymer containing no ceramic particles.

FIGS. 2(a), 2(b), and 2(c) are longitudinal cross-sectional views of an example of a composite spinneret device used for producing the hollow composite polyester staple fiber shown in FIG. 1 of the present invention. . Here, 3 in FIG. 2(A) indicates a distribution plate, 4 indicates a front plate, and 5 indicates a nozzle plate. Furthermore, Fig. 2 (b) shows the X of the front plate discharge hole.
-X' sectional view, Figure 2 (c) is y-y of the nozzle plate discharge hole
'This is a cross-sectional view. The polyester fibers can be crimped by any means, such as crimping by forming hollow fibers into composite fibers, crimping by external mechanical means, or the like.

Further, the suitable fiber length of the polyester fiber of the present invention as a stable fiber is 32 to 128 m.

If the fiber length is less than 32mm, the problem of fiber tangles being small during carding and cotton breakage is likely to occur;
If it exceeds 28wm, processability during carding will deteriorate.

In addition to ceramic particles, the polyester fiber of the present invention contains modifiers and functional agents such as antioxidants, stabilizers, dispersion aids, antibacterial agents, deodorants, flame retardants, colorants, and ultraviolet absorbers. may have been done.

〔Example〕

Hereinafter, the present invention will be explained in more detail using Examples.

The hollow ratio (2) in Examples was calculated by the following formula.

The bulkiness was determined by a web of 80t (80t) obtained by opening raw cotton with a card.
It was calculated as a proportion volume (QC / F) when the load (size 20αx20 vendor, weight 170F) was applied to the size 20 defeat x 20 tan).

Example 1 Sericite ceramic (Hikawa Mica Z-2 manufactured by Hikawa Togyo Co., Ltd.)
Polyethylene terephthalate polymer (relative viscosity t 63.25) containing 15 wt% of
Polyethylene terephtha V- containing a masterbatch of 5 wt % of titanium oxide (measured in metacresol) and titanium oxide.
) polymer (relative viscosity 1.6) and weight ratio i:
A polyethylene terephthalate polymer (relative viscosity 1.63) containing titanium oxide [L 50 wt%] was homogeneously blended with 2.75 and a chip containing 4 wt% ceramic particles based on the polymer as one component, and titanium oxide as the other component.
After feeding the chips into separate extruders and melting them at the temperatures shown in Table 1, a second
The mixture was introduced into the composite spinneret device shown in the figure and composite spun at 283°C. The discharge hole of the front plate had a diameter of 0.5 wm, and the distance between the front plate and the nozzle plate was 0.2 mm. The discharge hole of the nozzle plate is the second
The shape shown in figure (c) (W=α3+alI, t=0.1
5w, R: 1. am) was used.

The spun yarn was air-cooled and coated with an oil agent according to a conventional method, and then taken up and bundled at 680 m/min.

This undrawn yarn was seasoned for 20 hours at 25°C and 65% R and L, stretched four times at 90 m/min using a drawing machine, and crimped using a push-crimping device. Sa64+w
It was cut into pieces a and subjected to heat cera F at 150°C.

Table 1 shows the yarn quality of the fibers thus obtained, the bulkiness of the nonwoven web, etc.

Example 2 The same procedure as in Example 1 was carried out except that the melting temperature of the extruder was set at a common 285°C.

Table 1 shows the yarn quality of the fibers thus obtained, the bulkiness of the nonwoven web, etc.

Example 3 Sericite-based ceramic (Hikawa Mica Z-2 manufactured by Hikawa Togyo Co., Ltd.
A master patch of polyethylene terephthalate polymer (relative viscosity t 63 ) containing 15 wt of titanium oxide (0, average particle size α2 μm) and a polyethylene terephthalate polymer (relative viscosity 1.63) containing titanium oxide gold (o, s wt).
and are uniformly blended at a weight ratio of 1=6.5 to make a chip containing 2 vt% of ceramic particles to the polymer,
The same procedure as in Example 1 was carried out except that this was fed to an extruder and melted at the temperature shown in Table 1, and Table 1 shows the yarn quality of the obtained fibers, the bulkiness of the nonwoven web, etc.

Example 4 Except that the melt temperature of the extruder was set at a common 285°C,
It was carried out in the same manner as in Example 3, and the yarn quality of the obtained fibers, the bulkiness of the nonwoven web, etc. are shown in Table 1.

Comparative Example 1 The same procedure as in Example 2 was carried out except that the cross section of the fiber was changed to a normal circular cross section, and the yarn quality of the obtained fiber, the bulkiness of the nonwoven web, etc. are shown in Table 1.

Comparative Example 2 Same as Example 1 except that polyethylene terephthalate polymer (relative viscosity t 63 ) chips containing only 5 vt% titanium oxide Q were fed into a separate extruder and melted at the temperatures shown in Table 1. Table 1 shows the yarn quality of the obtained fibers, the bulkiness of the nonwoven web, etc.

Comparative Example 3 The same procedure as Comparative Example 1 was carried out except that the melting temperature of the extruder was set at a common 285° C., and the yarn quality of the obtained fibers, the bulkiness of the nonwoven web, etc. are shown in Table 1.

〔Effect of the invention〕

The far-infrared emitting polyester staple fiber of the present invention has durable far-infrared radiation characteristics and is particularly excellent in bulk, so it is suitably used in the field of interior bedding such as kotatsu futons.

[Brief explanation of the drawing]

Figure 1 (treetops), (b) is a cross-sectional view of an example of the fiber of the present invention, and Figures 2 (a), (b), and (c) are longitudinal cross-sections of an example of a spinneret device for producing the fiber of the present invention. They are a top view and a partial cross-sectional view thereof.

Claims (1)

[Claims] An average particle diameter of 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 time days
A far-infrared emitting polyester staple fiber having a hollow cross-sectional shape and made of a polyester polymer containing 1 to 15 wt% of ceramic particles of 1 to 1.5 μm.