JPH02145873A - Shrink proofing processing of wool cloth - Google Patents

Abstract

PURPOSE:To provide wool cloth with excellent shrink proofing performances without damaging characteristic handle of wool by treating wool cloth by corona discharge and impregnating the wool cloth with a silicone-based elastomer containing a specific functional group. CONSTITUTION:Wool cloth is treated by corona discharge, an epicuticular layer on the surface thereof is made rough, subjected to resin processing by using a polydimethylsiloxane and methylhydrogen siloxane containing amino group and silanol group as functional groups and an organometallic catalyst, an excellent film having crosslinking bond is formed on the surface of the cloth, the cloth is provided with washing resistance and can be washed at home.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for shrink-proofing wool fabric.

(Prior Art) In general, woolen fabrics have the disadvantage of shrinking significantly and turning into felt when washed at home, and various shrink-proofing methods have been developed to improve this problem.

For example, “New Dyeing Processing Course” (Kyoritsu Publishing) Volume 11,
As detailed on pages 150-160.

There are methods A to C below.

A. A method of removing scale from wool fibers with strongly oxidizing sodium hypochlorite. B. A method of coating wool fiber scales with a synthetic polymer. C1. Modifying the fiber surface by low-temperature plasma treatment, corona discharge treatment, etc. A method of reducing the anisotropy of the coefficient of friction of wool fibers by increasing the quality of wool fibers (problem to be solved by the invention) Wool fabrics that have been preshrunk treated using the conventional techniques have the following drawbacks: there were.

First, method A has the major drawback that the wool fabric is treated with strongly oxidizing sodium hypochlorite, which causes the fibers to become brittle, while method B has a hard texture.
Method C does not have sufficient shrink-proofing effect and has a rough and hard feel.

The present invention eliminates these drawbacks of the prior art.

The object of the present invention is to obtain a processing method that imparts excellent shrink-proofing performance to woolen fabrics.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have conducted extensive research and found that after corona discharge treatment is applied to woolen fabric, the resin is coated with a resin whose main ingredient is a silicone elastomer. The present inventors have discovered that by processing wool, it is possible to impart excellent shrink-proofing performance without impairing the unique feel of wool, and have thus arrived at the present invention.

That is, in the present invention, after a woolen fabric is subjected to a corona discharge treatment, the fabric is impregnated with a resin liquid consisting of polydimethylsiloxane and methylhydrogensiloxane having amino groups and silanol groups as functional groups, and then dried and heat-treated. The gist of the present invention is a method for shrink-proofing wool fabric, which is characterized by the following.

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

The wool fabric as used in the present invention refers to wool and cashmere wool.

Animal hair such as camel hair and albaca hair (hereinafter referred to as wool, etc.)
) alone or containing at least 30% or more of wool, etc.

In the present invention, first, a wool fabric processed through eight ordinary dyeing and finishing processes is subjected to a corona discharge treatment. Corona discharge treatment is 5~
It is appropriate to use an alternating current of 200 KIIz. This corona discharge treatment is generally performed in the atmosphere at normal pressure, but it can also be performed in an atmosphere of a gas other than air. The corona discharge treatment reduces the unit surface area (lnf) of the wool fabric.
) is preferably carried out with a discharge power amount of 1 joule or more and 106 joules or less. When the amount of supplied energy is less than 1 joule/d, the effect of the discharge treatment is insufficient,
If it exceeds 10'Jul/M, the surface of the wool fabric may become burnt or holes may form, so care must be taken. However, corona discharge treatment is a surface treatment that only modifies the surface of wool fibers, so it is similar to removing scale from wool with sodium hypochlorite treatment.
Since no damage is done to the wool fibers, no loss of tenacity occurs.

By subjecting the wool fabric to corona discharge treatment, the shrimp cuticle layer on the surface of the fiber is roughened, so that the anisotropy of the coefficient of friction of the wool fiber is reduced.

Wool fibers have scales, so the coefficient of friction differs depending on the direction of the fibers. What is the anisotropy of its friction coefficient?

When wool fabrics are washed at home, the fibers become entangled, causing felting and shrinkage. Wool fibers subjected to corona discharge treatment have less anisotropy in friction coefficient compared to untreated cloth, and exhibit shrink-proofing performance. However, simply applying corona discharge treatment to the woolen fabric does not provide sufficient shrink-proofing performance, so the first step is resin processing.

In the present invention, the corona discharge-treated wool fabric is impregnated with a resin liquid consisting of polydimethylsiloxane and methylhydrogensiloxane having amino groups and silanol groups as functional groups, and a catalyst, followed by drying and heat treatment.

The polydimethylsiloxane used here, which has amino groups and silanol groups as functional groups, is generally called a silicone elastomer, and when processed into fibers using a combination of methylhydrogensiloxane and an organometallic salt catalyst, the It forms a good film with crosslinks on the surface.

As a typical example, Ultratex ESC (manufactured by Ciba Geigy) is commercially available. This silicone elastomer has conventionally been used as a softener or stretchability improver.

In the present invention, the adhesion concentration of each resin is adjusted to be within the following range in terms of resin solid content relative to wool fibers.

Polydimethylsiloxane 1.0-2.5% o, w, f
.

Methyl, Fo, Di, III, Xane 0
．． 1-0.5% o, w, f.

Catalyst 0.05-0.5% o', w, f.

Drying is done at 120'C using a normal hot air dryer.
Do this for 2 minutes. The heat treatment is performed at 150 to 160°C for 1 to 2 minutes. In this case, below 150°C.

Since the crosslinking reaction of the silicone elastomer film becomes insufficient, satisfactory shrink-proofing performance cannot be obtained.

If the temperature is 160° C. or higher, problems such as yellowing and brittleness of the wool fabric may occur, which is not preferable.

By applying the above processing, it has excellent shrink-proofing performance,
Furthermore, it is possible to obtain the woolen fabric of the present invention that retains the unique feel of wool.

(Function) The influence of corona discharge treatment on wool is not certain, but the inventors of the present invention think as follows.

When wool fabric is subjected to corona discharge treatment, ozone exists in the corona generated by the corona discharge.

Nitric oxide, etc. act on the hydrophobic shrimp cuticle layer on the wool fiber surface to make the wool surface hydrophilic through oxidation, which improves the permeability of the resin during the first resin processing, and improves the ability to bond with the wool fiber surface. Adhesion with resin has been greatly improved, and when resin processing is performed in this state with a resin liquid made of polydimethylsiloxane or methylhydrogensiloxane that has amino groups and silanol groups, it will firmly adhere to the wool fiber surface. It is formed with a silicone elastomer film in close contact with it, giving it excellent shrink-proofing performance and wash resistance.

In addition, the present invention does not require the use of a very hard resin coating, such as Bayer's urethane resin (Thintablet BAP), which is widely used in the shrink-proofing of wool. The texture can be maintained.

(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples. The performance of the fabric in the Examples was measured and evaluated using the following method.

(1) Vertical length of sample (30 (IJX 30aa)) according to the washing shrinkage rate measurement method of J15-L-1018.

Mark 20cm in each horizontal direction, JIS-L-
After washing was repeated 20 times according to 0217 (103 method), the length (c++) of the sample was measured and the shrinkage rate (%) was calculated using the following formula.

Shrinkage resistance was evaluated based on the shrinkage rate.

(2) Texture The wool fabric sample was evaluated in three stages, including the first one, by handling by a panel of experts.

○: Unique texture of wool Δ: Wool texture is slightly impaired ×: Wool texture is impaired Example 1 100% wool twill fabric dyed and finished in a normal manner (Hand number 2/60°S for warp and weft, warp density 61/inch, weft density 56/inch).

This was subjected to corona discharge treatment with a discharge power of 3000 joules/d. At this time, the atmosphere during corona discharge was air.

The following formulation l is applied to the fabric that has been subjected to corona discharge treatment in this way.
After impregnating with resin liquid and drying at 120°C for 2 minutes,
A heat treatment was performed at 160° C. for 2 minutes to obtain a shrink-proof fabric of the present invention.

[Prescription l]

For comparison with the present invention, a comparative processed fabric (referred to as Comparative Example 1) was obtained by the same method as in Example 2, except that the step of impregnating with the resin liquid of recipe 1 was omitted. Ta. This sample was subjected to only the corona discharge treatment of Example 1. In addition, for comparison with the present invention, a processed fabric for comparison (referred to as Comparative Example 2) was obtained in the same manner as in Example 8, except that the corona discharge treatment was omitted. This is a product in which only the resin processing in Example 1 was performed.

Furthermore, for comparison with the present invention, the same wool fabric used in Example 1 was prepared, impregnated with the resin liquid shown in the following formulation 2, dried at 120°C for 2 minutes, and then heated to 160°C.
Perform heat treatment for 2 minutes.

A processed fabric for comparison (referred to as Comparative Example 3) was obtained.

(Formulation 2) The method of Comparative Example 3 is a method of coating the scale of wool fibers with a synthetic polymer substance, and is a shrink-proofing method that is currently widely practiced in the industry.

The performance of the processed fabrics of the present invention and comparative fabrics was measured and evaluated, and the results are shown in Table 1.

Table 1 As is clear from Table 1, the shrink-proof fabric processed by the method of the present invention has a shrinkage rate of 0 even after repeated washing 20 times.
．． 5%, indicating that it has very excellent anti-shrink performance. The texture also maintained the unique sliminess and feel of wool.

On the other hand, the processed fabric of Comparative Example 1, which was subjected to only corona discharge treatment, had insufficient shrink-proofing performance and the unique texture of wool was slightly impaired;
The shrinkage rate of the processed fabric of Comparative Example 2, which was subjected to only the same resin processing as in the method of the present invention, was extremely large. In addition, although the wool fabric of Comparative Example 3, which was processed by coating wool scale with a synthetic polymeric material, had fairly excellent shrink-proofing performance, the unique texture of wool was lost and it had a very hard texture. Met.

Example 2 A shrink-proof fabric of the present invention was produced in the same manner as in Example 1 except that the air in the atmosphere during corona discharge was replaced with oxygen.

When the shrinkage rate of this processed fabric was measured, it had better shrink-proof performance than the shrink-proof fabric of Example 1 at 0% in the vertical direction and 0.1% in the horizontal direction. Also.

In terms of texture, it retained the sliminess and waist characteristic of wool.

(Effects of the Invention) According to the method of the present invention, it is possible to impart excellent shrink-proofing performance to wool fabric without impairing the unique texture of wool6.
The fabric is preshrunk by the method of the present invention.

Since the fabric has excellent shrink-proofing performance and washing durability, clothing sewn using this fabric can be washed at home, making wool a fiber that is even easier to handle.

Patent applicant: Yu-Tei Riki Co., Ltd. Shokusha

Claims (1)

[Claims] (1) After corona discharge treatment of a woolen fabric, the fabric is impregnated with a resin liquid consisting of polydimethylsiloxane and methylhydrogensiloxane having amino groups and silanol groups as functional groups, and then dried and heat treated. A method for shrink-proofing wool fabric.