JP2002266241A - Durable water-repellent fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a product having strong durability and high water-repellent effects by cross-linking a water-repellent substance even in a stage of a yarn of cellulosic fibers or a stage of the product with an isocyanate. SOLUTION: The durable water-repellent fibers are obtained by placing water and the cellulosic fibers in a container charging the isocyanate and a fluorine resin thereinto, carrying out heating at 100-180 deg.C according to the kind of the cellulosic fibers, thereby causing chemical reaction and cross-linking the cellulosic fibers to the fluorine resin. Since the resultant fibers comprise the fluorine resin combined to the fibers themselves by the chemical bond, water-repellent fibers having high durability can be produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-repellent fiber.

[0002]

2. Description of the Related Art Conventionally, a water repellent treatment for imparting water repellency to a cloth or a knitted fabric is performed by forming a yarn into a fabric and then attaching or coating a water repellent substance such as a water repellent resin or polyurethane to the surface layer. Almost. When processing is performed by such a method, the following problems are likely to occur. 1. Adhesion of the water-repellent substance or peeling of the coating is caused by friction. If the adhesion of the water-repellent substance or the coating is strengthened in order to solve this, the surface is hard and the wrinkles are likely to occur. 2. Since the entire fabric is covered, the space between the fibers is filled with a water-repellent substance, which makes it difficult for perspiration from the body to pass through, such as when wearing clothes, and to be stuffy. In order to solve this, if you weaken the adhesion or coating of the water repellent substance,
Water repellency is impaired.

[0003]

The problem to be solved by the present invention is to develop a highly durable and highly water-repellent fabric while ensuring air permeability.

[0004]

Means for Solving the Problems Water and cellulose fibers are put in a container, isocyanate and a fluororesin are charged, and after dehydration, heated to 100 to 180 degrees depending on the type of the cellulose fibers.

[0005]

When water and cellulose fiber are put in a container, isocyanate and fluorine-based resin are charged and heated, a chemical reaction occurs, and the cellulose fiber and fluorine-based resin are cross-linked. If the effect is explained using cotton (wool) as an example under the combined use of a water-repellent substance and an isocyanate,
It looks like this: The following formula is one type of isocyanate.

Embedded image

When heat of 100-180 degrees is applied to

Embedded image and,

Embedded imageAre generated by thermal dissociation. That thermal dissociation has occurred
CONHCH, a water-repellent substance₂OH group or CH₂C
H₂ OH group

A cross-linking reaction occurs with the CNO group of the following formula. In addition, cotton is O
Because it has an H group

## STR2 ## CNO and water repellent CONHCH ₂ OH
Also reacts with the group CH ₂ CH ₂ OH,

Embedded image And the water repellent material and the cellulose fiber are strongly bonded. These reactions are chemical bonds in a broad sense, and can be said to be urethane bonds in a narrower range. Water-repellent substance,
Figure 1 shows the bonding of isocyanate and cellulose fiber (yarn).
It can be said that the state is as follows.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The water-repellent cellulose fibers of the present invention can be produced at the yarn stage or at the fabric stage. In addition, even if the fiber is other than the cellulose fiber and the water-repellent substance is not fluorine-based, the same effect as that of the present invention can be obtained as long as the fiber can be cross-linked with the isocyanate.

[0007]

As shown in FIG. 2, when the water-repellent substance falls down due to friction or the like, the water-repellent effect is reduced. But,
Since the water-repellent substance and the cellulose fiber are strongly linked by a chemical reaction, the water-repellent substance is not removed. The water-repellent substance has a property of restoring a collapsed state when heat is applied. Therefore, even if the water repellency of the cellulose fiber of the present invention deteriorates due to friction or the like, it returns as shown in FIG. 3 when heated with an iron or the like, and the water repellency is restored.
A semi-permanent water repellent effect can be obtained. Further, since the water-repellent cellulose fiber of the present invention can have a water-repellent effect at the yarn stage, any weave fabric can be produced. In the conventional method of coating a water-repellent agent in a fabric state, the space between the fibers is clogged with a water-repellent substance, and air permeability is impaired. Since the fibers are surely attached to the fibers themselves, no extra water repellent material fills the spaces of the fibers and does not clog. Therefore, it is possible to produce a fabric having good air permeability and high water repellency. Since the yarn itself has a water-repellent effect, it can be applied to fabrics woven with other yarns and fabrics of various weaves, and by adjusting the weave, the breathability is adjusted I can do it. It is also an excellent point that the fibers have a water-repellent effect even when the fibers are raised. Hair, cotton,
Fibers such as hemp and polyester can be provided with a strong water-repellent effect, and since the water-repellency can be restored by heat or the like, these materials can be maintained semi-permanently. Conventional water-repellent products have been useful only for specific applications such as raincoats and outdoor goods. It can also be used for formal wear. Therefore, if you make suits, jeans, shirts, etc., you will not be wet by sudden rain etc.
Moreover, it is very convenient because it is hard to get dirty. Of course, if a conventional rain gear, such as a raincoat, is made of the water-repellent cellulose fiber of the present invention, the rain gear will not be stuffy and comfortable to wear, and will be an unprecedented rain gear.

[Brief description of the drawings]

FIG. 1 is an image diagram illustrating the mechanism of a durable water-repellent fiber. A water-repellent substance B cellulose fiber C isocyanate

Fig. 2 Image of reduced water-repellent effect B Cellulose fiber C Isocyanate D Falling water-repellent substance E Water

FIG. 2 is an image diagram in which the water-repellent effect is restored by heating A water-repellent substance B cellulose fiber C isocyanate E water

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[Procedure amendment]

[Submission date] May 24, 2001 (2001.5.2)
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an image diagram illustrating the mechanism of a durable water-repellent fiber

Fig. 2 Image of reduced water-repellent effect

FIG. 3 is an image diagram in which a water-repellent effect is restored by heating.

[Description of Signs] A Water-repellent substance B Cellulose fiber C Isocyanate D Falling water-repellent substance E Water

Claims (1)

[Claims] 1. A water-repellent cellulose fiber obtained by cross-linking a water-repellent substance such as a fluororesin or water-repellent silicon with isocyanate