JPS626983A - Water absorbable cloth - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a fabric with improved water absorbency and water conductivity without changing dyeability and without deteriorating the texture.

(Prior Art) The excellent water absorption, hygroscopicity, texture, and appearance of natural fiber fabrics have given rise to the field of natural fiber-like synthetic fiber fabrics, which are now available in the hands of consumers in numerous products.

Many efforts have been made to improve the hydrophobicity, which is the biggest drawback of synthetic fibers, to make it more absorbent and hygroscopic, such as by reducing the hydrophobic content in the polymer main chain during the polymerization stage. A method of imparting water absorbency to the molecular structure itself, and a method of blending a hydrophilic polymer into a hydrophobic polymer at the yarn stage and spinning it to make it absorbent.
7-8972, JP-A-50-148625, etc.), and a method of graft polymerizing a hydrophilic component onto a fabric to make it absorb water. but.

These methods reduce the reeling properties and the physical properties of the fabric.

Due to drawbacks such as poor chemical properties, there are still only a few products that have been commercialized. In addition to imparting water absorbency, various attempts have been made to impart water absorbency by making fibers with irregular cross-sections and post-processing with relatively little deterioration in physical and chemical properties, but excellent water absorbency has not always been achieved. Moreover, the irregular cross-section of the fibers has the problem of impairing the texture of the fabric and changing its dyeability.

(Problem to be solved by the invention) The present invention was made in view of the above-mentioned current situation.

To provide a fabric that has excellent water absorbency and water conductivity without changing its dyeability or impairing its texture.

(Means for Solving the Problems) The present invention has the following configuration to achieve the above object. That is, the present invention has two or more recesses in which the value of the opening angle θ of the recess is in the range of 60°≦θ≦160° in the wavy flat cross section of the fiber, and is defined by the following formula [1]. A fabric made of wavy flat cross-section fibers having a flatness A value in the range of 1.5≦A≦3, the fabric comprising an aromatic polyester polyether chloride copolymer with respect to the weight of the fabric. The gist thereof is a water-absorbing fabric characterized by containing 0.8% or more of water.

Two aspects of the present invention will be described in detail below.

The fabric referred to in the present invention is polyester-based, polyamide-based,
It refers to sheet-like fiber structures such as ordinary knitted woven fabrics and nonwoven fabrics made of thermoplastic synthetic fibers such as polyacrylic fibers.

The cross section of the fiber constituting the fabric of the present invention has a wavy flat cross-sectional shape, and has two or more concave portions in a shape that is bent twice in opposite directions. Figures 1 and 2 illustrate cross-sections of wave-shaped flat cross-section fibers used in the fabric of the present invention, in which (a) in Figure 2 is a 1.5-wavelength flat type, (b) is a 2-wavelength flat type, ( C) shows a cross-sectional view of a 2.5-wavelength flat type, and (d) shows a cross-sectional view of a two-wavelength flat approximate type. These cross-sectional shapes are obtained by spinning using spinnerets with nozzles having the shapes shown in (a) to (d) of FIG. 3, respectively. The flatness of the wavy flat cross-sectional shape is such that the flatness A defined by the following equation [1] is in the range of 1.5≦A≦3.

If the flatness A is less than 1.5, the flatness is too small and effective orientation cannot be obtained, and if the flatness A exceeds 3, the cross-sectional shape becomes unstable, which is not preferred. As shown in the example of FIG. 1, the opening angle of the wavy recess of the wavy flat cross section is indicated by the opening angle θ of the inner side of the recess, and this frontage angle θ is preferably in the range of 60°≦θ≦160′. This opening angle θ is 60°
If the opening angle θ exceeds 160°, bonding with the protrusions becomes easy, but a sufficient capillary path cannot be obtained, which is not preferable. Such a capillary path is particularly well formed when the opening angle θ is in the range of 80°≦θ≦140′, so setting the opening angle θ within the above range is even more effective. In the present invention, an aromatic polyester polyether block copolymer is added as a water-absorbing agent to the fabric made of the above-mentioned wave-shaped flat cross-section fibers. The aromatic polyester polyether block copolymer used in the present invention means a block copolymer consisting of terephthalic acid and/or isophthalic acid and alkylene glycol and polyalkylene glycol. used in the form of an emulsion dispersed in This emulsion can be applied to the fabric by any method such as an impregnated pad method or an exhaustion method, and is not particularly limited. However, the exhaustion method is most suitable for applying it more evenly. In addition, in order to obtain outstanding water absorbency and durability, when applying the block copolymer to the fabric, it is necessary to apply the block copolymer in a solid content of 0.8% or more based on the weight of the fabric.

(Function) The fabric of the present invention is made of flat cross-sectional fibers having a wavy cross-sectional shape, and is coated with an aromatic polyester polyether block copolymer.

Since the constituent fibers of the fabric of the present invention are wavy flat cross-section fibers as described above, the concave portions and convex portions of the fibers engage with each other, making it easy for the fibers to join together. When the fibers are joined together, the inter-fiber voids become very small, forming a capillary path -6=, and the active capillary phenomenon results in water absorption.

Water conductivity increases. Furthermore, in the present invention, since the fiber contains a hydrophilic aromatic polyester polyester polyether polymer, the capillarity layer is activated and synergistically improves water absorption and R water resistance. bring.

(Example) Here, the manufacturing method of the fabric of the present invention will be explained with reference to an example, and the performance of the fabric in the example will be measured.

The evaluation was performed using the following method.

(11 Water Absorption JIS 1.-1079 Byresoku Method (2) Stainability C It was visually judged under a standard light source and the first three-level evaluation was performed.

〇-Good, △-Slightly poor, ×-Poor (3) Texture Sensory test by handling 9
The following three-level evaluation was performed.

◎−Very good, 〇−Good Am Slightly defective.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.68 (measured in 0-chlorophenol) was melt-spun using the nozzle shown in FIG. The yarn was wound at a high speed to obtain an undrawn yarn. This undrawn yarn was drawn three times in a conventional manner at a drawing speed of 700 m and 7 minutes, and then wound up. In this way, a 75d/24f wavy flat cross-sectional fiber (opening angle inside the recess 100°, flatness 2.6) having the cross section shown in FIG. 2 (b) was obtained. This drawn filament was used for the warp and weft to weave a plain fabric with a warp density of 100/inch and a weft density of 80/inch, and after refining in the usual manner, using a treatment bath of the following formulation 1, at 130 ° C. Dyeing and water absorption processing were performed simultaneously for 30 minutes. below.

The water-absorbent fabric of the present invention was obtained by drying and final centrifugation using a conventional method.

Prescription 1 5R-1000 (Takamatsu Yushi Co., Ltd., aromatic polyester polyether prosodic copolymer) 8%owfDia
nix Red U-3R (Mitsubishi Kasei 1 disperse dye) 1
% owf Nisokasansolt RZ-8 (Nicca Chemical 2 dispersant) 0.
5g/It Acetic acid (48%') 0.2g/#For comparison with the present invention2 In place of the W-shaped cross-sectional fiber used in this example, fibers with the cross-sectional shapes shown in Figures 4 (a) to (d) were used. Comparative water-absorbent fabrics (A) to (D) were prepared in exactly the same manner as in this example, except that the fibers (manufactured using the spinnerets of the nozzles shown in FIGS. 5 (A) to (D), respectively) were used. d) was obtained.

Measuring the performance of this comparative fabric and the fabric of the invention;
Evaluation was conducted and the results are shown in Table 1.

Table 1 As is clear from Table 1, the fabric of the present invention has excellent water absorbency and water conductivity without any change in dyeability due to irregularly shaped cross sections and without deteriorating the texture.

(Effects of the Invention) The water-absorbing fabric of the present invention is characterized in that specific wave-shaped flat cross-section fibers are used as the constituent fibers, and an aromatic polyester polyether brox copolymer is used as the water-absorbing agent. According to the present invention, a fabric with improved water absorbency and water conductivity can be obtained without changing the dyeability or deteriorating the texture.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example of a wavy flat cross-section fiber used in the fabric of the present invention, and is for explaining the opening angle θ. FIG. 2 is a cross-sectional view showing an example of a wavy flat cross-section fiber used in the fabric of the present invention. FIG. 3 is a plan view showing the shape of a nozzle of a spinneret for spinning the wavy flat fibers shown in FIG. 2. FIG. FIG. 4 is a cross-sectional view showing an example of a modified cross-section fiber used as a comparative example. FIG. 5 is a plan view showing the shape of a nozzle of a spinneret for spinning the irregular cross-section fiber shown in FIG. 4.

Claims (1)

[Claims] (1) The fiber has two or more recesses in which the value of the opening angle θ of the recess is in the range of 60°≦θ≦160° in the wavy flat cross section of the fiber, and the flatness A defined by the following formula [I] A fabric made of wave-shaped flat cross-section fibers having a flatness value in the range of 1.5≦A≦3, wherein the aromatic polyester polyether block copolymer is added in an amount of 0.0% based on the weight of the fabric.
A water-absorbing fabric characterized by containing 8% by weight or more. Flatness A = Length of fiber cross section in major axis direction / Length of fiber cross section in short axis direction [I]