JP2969582B2 - Woven knitted synthetic fiber with improved hygroscopicity - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic fiber woven or knitted fabric in which the function relating to moisture or sweat, particularly steam-based sweat, which is one of the weak points of synthetic fibers, is improved, and the wearing comfort as clothing is improved. .

[0002]

BACKGROUND OF THE INVENTION Synthetic fibers are generally superior to natural fibers in mechanical properties and dyeing fastness, and are durable as clothes and easy to handle. In recent years, due to innovations in synthetic fiber manufacturing technology and woven / knitted fabric manufacturing technology, synthetic fiber woven / knitted fabrics having a texture that is not inferior to that of natural fibers have come to be produced.

[0003] However, it cannot be said that the comfort of wearing, especially as a garment relating to sweat, is still far from that of natural fibers. In particular, with respect to vapor-based sweat, the hygroscopicity of the fiber plays a significant role. Regarding water-based sweat, even for synthetic fibers, a resin finish to improve the wettability of the fibers, a devised physical structure of the fibers (cross section, side shape), and a woven or knitted fabric structure (appropriate arrangement of voids between fibers) Many methods have been proposed to improve the water absorbency by devising the above. However, all of these are merely suction of physical water-based sweat using micro-spaces between fibers, that is, capillaries, and are completely ineffective against steam-based sweat.

However, most natural fibers have a function of absorbing steam-based sweat, that is, a moisture-absorbing property, and naturally have a comfortable family name that softens the heat and humidity of clothing and gives them coolness. I have.

While attempts have been made to improve the hygroscopicity of synthetic fibers for a long time, satisfactory functions have not yet been obtained. A method of modifying the base polymer of synthetic fibers to obtain hygroscopicity is not impossible from the viewpoint of moisture absorption alone, but it is not impossible to achieve a level comparable to that of natural fibers. And the excellent color fastness is impaired, and there is a limit. In addition, it is common to knead another moisture-absorbing substance into the fiber while leaving the substrate as it is, or to attach it to the surface of the fiber later, but knead or adhere without impairing other characteristics. The amount of hygroscopic material used is small, and the improved moisture absorption is minimal, which is insufficient to improve wearing comfort. Although a method of attaching a moisture-absorbing substance to the surface of the fiber later is a simple and inexpensive method, it has a disadvantage that it is easily dropped by washing and has poor durability of moisture-absorbing performance.

[0006]

Synthetic fibers generally have little hygroscopicity and have a drawback in the function of treating sweat when worn as clothes, and synthetic fiber clothes are said to be sultry. I have. Sweat includes indifferent distillate and perceived distillate. During indifferent distillate, vapor-based sweat is excreted continuously, and in perceived distillate, vapor-based sweat and water-based sweat are continuously excreted. If the clothes cannot quickly and properly absorb both water-based sweat and steam-based sweat that are constantly excreted, sweat will remain on the skin and the heat inside the clothes will increase due to excessive heat. In addition, sweat condensed on the clothes and sweat remaining on the skin cause discomfort such as a sticky feeling and a cold feeling.

[0007] Water-based sweat is particularly observed when the environment is hot or during exercise with high intensity accompanied by an increase in body temperature, while steam-based sweat is always emitted at any time and at any time. Therefore,
How well a garment can handle this sweat (both water-based and steam-based sweat) is deeply involved in the comfort of the garment.

[0008] An object of the present invention is to provide a synthetic fiber with both a vapor-based sweat and a water-based sweat quickly and sufficiently without impairing the mechanical superiority and excellent color fastness inherent of the synthetic fiber. Another object of the present invention is to propose a synthetic fiber woven or knitted fabric having a function of absorbing sweat and suitable for producing comfortable clothes.

[0009]

SUMMARY OF THE INVENTION The present invention has a diameter of 0.00 mm.
A woven or knitted fabric containing porous synthetic fibers having micropores of 1 to 10 microns, the length of which is 50 times or less of the diameter is scattered throughout the cross section, and part of which is connected to each other. In addition, the present invention provides a synthetic fiber woven or knitted fabric having improved hygroscopicity in which a natural protein is impregnated in at least a part of the pores and crosslinked and insolubilized.

[0010] More preferably, the present invention has a hollow portion communicating with the fiber axis direction, and has a diameter of 0.0
Using a woven or knitted fabric containing porous hollow fibers in which micropores are scattered at least a part of which is 50 to 100 times the diameter, at least a part of which is communicated to the hollow portion,
The present invention provides a synthetic fiber woven or knitted fabric having improved hygroscopicity, in which the fine pores and hollows are impregnated with a natural protein and crosslinked and insolubilized.

In the present invention, a woven or knitted fabric refers to a woven or knitted fabric.

As the synthetic fibers, any suitable synthetic fibers can be used, but polyester fibers, especially polyethylene terephthalate fibers, are preferred.

The synthetic fiber constituting the woven or knitted fabric of the present invention has a diameter of 0.001 to 10 μm, preferably 0.01 to 5 μm.
It is essential that micropores having a length of 50 microns or less are scattered throughout the cross section and a part of which is connected to each other. It is preferable to have a hollow portion communicating with the fiber axis direction. In this case, the ratio of the hollow portion, that is, the hollow ratio is 3 to
50% is preferred.

These fibers are disclosed, for example, in JP-A-57-11
It can be produced by the method disclosed in JP-A-212-213 and JP-A-57-139516.

After weaving or knitting using the porous synthetic fiber having such a configuration, the size of the fine pores on the fiber surface is adjusted by a weight reduction treatment with an alkali, if desired, to impregnate the natural protein.

The natural protein includes gelatin, collagen, fibroin, soybean protein, casein, sericin and the like. Essentially any natural protein can be used, but sericin is particularly preferred from the viewpoint of easy handling and fiber performance.

These natural proteins are usually impregnated in the form of a solution into the above-described woven or knitted fabric. Water is preferred as the solvent. Sericin is easy to handle in that it is easily soluble in cold water and the aqueous solution does not gel. Proteins soluble in water-insoluble organic solvents are
Impregnation can be performed using an organic solvent solution. Insoluble proteins can be used if they can be classified into these.

Thus, if there are micropores and hollows,
After arranging the natural protein in the hollow portion, it is subjected to a cross-linking and insolubilization treatment. For the cross-linking insolubilization, a method of preliminarily coexisting a divalent or higher valent polyvalent compound reactive with a functional group such as an amino group or a carboxyl group of the protein and performing a heating reaction is preferably employed. Examples of the crosslinking agent include polyfunctional crosslinking agents such as aldehydes such as formalin and glutaraldehyde and various epoxy compounds, and those having a crosslinking function such as a glycidyl ether type or an aqueous urethane type and a film forming matrix function. Is more preferably used.

In this way, a significant effect of absorbing not only water-based sweat but also steam-based sweat is obtained without impairing the original excellent functional performance and dyeing fastness of the synthetic fiber knitted fabric. As a result, the comfort can be significantly improved.

[0020]

【Example】

Example 1 40d of hollow polyester fiber (trade name: Welkey: manufactured by Teijin Limited) having fine pores satisfying the conditions of the present invention
For a 24 gauge smooth knitted fabric using
% Was subjected to an alkali weight reduction process to obtain a test fabric. A normal mangle pad treatment was performed on the cloth. An aqueous solution having the following composition was used as a treatment liquid. Sericin 50 g Polyethylene glycol diglycidyl ether 50 g Diethylene triamine 2 g / 1 l This fabric was heat-treated at 160 ° C for 30 seconds.

Comparative Example 1 (Normal Water Absorption Processing for Polyester) SR-1000 (Takamatsu Oil & Fat Co., Ltd.) was prepared at 4% owf, and an appropriate amount of acetic acid was added thereto to adjust the pH to around 3.5. A treatment liquid was used. The same hollow polyester fiber fabric as in Example 1 was subjected to a 15% weight reduction process. This fabric was immersed in a water absorbing agent (SR-1000: Takamatsu Oil & Fats Co., Ltd.) at 110 ° C. for 30 minutes. After removing the excess treatment liquid with a mangle,
Heat treatment was performed at 50 ° C. for 1 minute. Table 1 shows a comparison of the above water absorption. (Measurement method) Bairesoku (JIS-L-10
96) Measured by the method.

[Table 1]

As is clear from the table, the knitted fabric using the fabric of Comparative Example 1 showed twice or more the water absorption as compared with the water absorption of the ordinary polyester fiber knitted fabric. Comparative Example 1
The improved water absorption was maintained even after performing the impregnation crosslinking treatment with sericin. Next, Table 2 shows a comparison of the hygroscopicity of the cloth.

The hygroscopicity of the fiber was evaluated by the following method. 1) The weight of the fiber to be measured is measured in an atmosphere at 20 ° C. and 65% RH or after maintaining at 40 ° C. and 90% RH for 2 hours. (Measured value A) 2) For the fiber whose weight after moisture absorption was confirmed in 1), 1
Treat at 05 ° C for 2 hours, measure the weight after drying.
(Measured value B) 3) The moisture absorption (%) is calculated by the following equation. Moisture absorption = (measured value A-measured value B) / measured value B × 100

[Table 2]

As is clear from the table, the fabric using the regular polyester shows no hygroscopicity. Also,
The fabric of Comparative Example 1 with improved water absorption also shows no hygroscopicity. On the other hand, the fabric of Example 1 showed high hygroscopicity. Next, Table 3 shows a comparison of the contact thermal sensation of the cloth.

When wearing clothing, when the clothing material comes into contact with humans, it may feel cold or warm. This is called a contact thermal sensation. The thermal sensation of contact with the cloth can be considered as a local transient heat conduction phenomenon occurring between the cloth having different temperatures and the skin surface. The coolness that the skin feels
It is caused by the rate at which the skin temperature drops, and is related to the specific heat and thermal conductivity of the material and the size of the contact area of the material. This thermal sensation of contact can be quantified by local heat transfer on the skin surface, and Qmax (cal / c
m ² · sec) to represent.

It was confirmed that Qmax increased as the amount of sericin applied increased. The meaning of the increase rate of the heat transfer amount, for example, the increase rate of the heat transfer amount of 37%, is an effect comparable to the case where cotton is mixed with the hollow polyester fiber by nearly 50%.

[Table 3]

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) D06M 13/00-15/72 D01F 11/00-13/00

Claims (5)

(57) [Claims] 1. Pores having fine pores having a diameter of 0.001 to 10 μm and a length of 50 times or less of the diameter are scattered throughout the cross section, and a part thereof is connected to each other. CLAIMS 1. A woven or knitted fabric containing high quality synthetic fibers, wherein at least a part of the micropores is impregnated with a natural protein and crosslinked and insolubilized to improve the hygroscopic property. 2. A porous hollow fiber having a hollow portion in which a porous synthetic fiber communicates in a fiber axis direction, wherein at least a part of the micropores scattered in a cross section communicates with the hollow portion, and 2. The woven or knitted fabric according to claim 1, wherein the protein is impregnated in at least a part of the micropores and hollows and is crosslinked and insolubilized. 3. The synthetic fiber woven or knitted fabric according to claim 1, wherein the porous synthetic fiber is polyester. 4. The woven or knitted fabric according to claim 2, wherein the hollow ratio is 3 to 50%. 5. The woven or knitted fabric according to claim 1, wherein the natural protein is sericin.