JPH02234975A - Weight-reduction process for cotton cloth - Google Patents

Abstract

PURPOSE:To obtain a cotton cloth having silky feeling by treating a cotton cloth with a solution composed of sulfuric acid and acetone having specific concentrations, thereby reducing the weight of the fiber. CONSTITUTION:A cotton cloth having high quality and giving silky soft feeling is produced by immersing a cotton cloth in a solution containing 45-60% of sulfuric acid and 10-30% of acetone, thereby reducing the weight of the cotton fiber.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for weight-reducing cotton fabric, which is capable of weight-reducing and modifying cotton fabric to obtain a silk-like sensory texture. be.

[Prior art] Conventional softening processing for improving the feel of cotton fabrics uses enzymes as softening agents, and research is progressing on softening processing that involves weight loss due to the chemical action of the enzymes. There is.

[Problem to be solved by the invention] However, in the softening process of cotton fiber using enzymes, the processing time required is about one week, so the processability (productivity) is low. In addition, temperature control and pH tube embedding are necessary during processing, and if these controls are not done properly, the strength of the cotton fiber (thread) will deteriorate and the product value will decrease. There was also a problem.

[Means for Solving the Problems] The present invention has been made by focusing on such conventional problems, and its first purpose is to develop a cotton fabric that can shorten the conventional long-time processing and increase productivity. An object of the present invention is to provide a method for reducing the weight of fabric.

The second object is to provide a weight loss processing method that prevents deterioration of fibers during weight reduction processing of cotton fabric and does not reduce commercial value. The third objective is to obtain a high-quality cotton weight-reduced fabric that is effective in softening the cotton fabric and can sufficiently obtain the feel of silk fabric.

A method for reducing weight of cotton fabric that achieves the above object will be specifically described below.

As is well known, the monofilament structure of cotton has its outer peripheral surface formed by a primary cell wall, a secondary cell wall formed inside the primary cell wall, and a core material within this secondary cell wall. This is where a certain lumen is located. The above-mentioned primary cell wall is for protecting the secondary cell wall and the lumen, and is a thin film with cellulose as a supporting component and in which pectin, wax, and microfibrils are present. The secondary cell wall is located inside the primary cell wall, and the microfibrils exhibit a helical structure with an angle of inclination of 22' to 45° to the fiber axis. General pretreatment is performed to destroy and remove pectin and wax contained in the primary cell wall, but with conventional pretreatment, it is difficult to remove fibrils. , it was impossible to reduce the weight of cotton and make it into silk.

Therefore, in this example, a sulfuric acid solution is used to decompose and remove fibrils contained in the primary cell wall. That is, fibrils undergo a change in crystal structure by sulfuric acid at a specific concentration, and are eluted into water by acetone coexisting with sulfuric acid, resulting in softening of cotton.

Next, regarding the concentration of the sulfuric acid solution used to decompose and remove the fibrils, according to experiments conducted by the present inventor, the concentration of the sulfuric acid solution is about 45 to 60%.
The cotton fabric to be treated is placed in the treatment solution at room temperature for about 1 hour.
By dipping for ~2 minutes, a delicate wool-like soft texture was obtained. Next, reduce the concentration of the sulfuric acid solution to about 6
As a result of the same treatment with 6%, shrinkage occurred in the cotton fabric, and the fabric became hard and lost its soft feel. Furthermore, as a result of the same treatment with a sulfuric acid solution with a concentration of 67 to 71%, the fabric was further hardened and became translucent.

In this way, when the sulfuric acid solution concentration is 45 to 60%, the reaction reaches the primary cell wall, resulting in a woolly texture, but when the solution concentration is higher than that, it becomes linen-like hardness, which is normal. It turned out that the result was a finish known as organdy processing.

In the above treatment using only the sulfuric acid solution, it is possible to soften the material as described above, but almost no change in weight loss can be obtained. Therefore, in this example, by using a sulfuric acid solution mixed with 10 to 30% acetone, the primary cell walls are removed by washing with water, resulting in a reduced weight cotton fabric with a silk-like texture. (soft feel) and elegance.

[Example] A 100% cotton lawn fabric was sintered, desized, and
The fabric that had been scoured, bleached, and macerized was subjected to the following four treatments.

A. The fabric was crushed in a 60% sulfuric acid solution (liquid temperature 25°C), then squeezed, placed in 30 tons of air for 3 minutes, immediately washed with water for neutralization, and then dried to obtain treated fabric A. Obtained.

B. The fabric was immersed in a solution (liquid temperature 25°C) made by mixing 60% sulfuric acid and 10% acetone, and then squeezed and then 3
After waiting for 3 minutes in air at 0°C, it was immediately washed with water and neutralized, and then dried to obtain treated fabric B.

C. A fabric was crushed in a solution (liquid temperature 25°C) made by mixing 56% sulfuric acid and 15% acetone, and then squeezed and then 3
After being exposed to air at 0° C. for 3 minutes, it was immediately washed with water and neutralized, and then dried to obtain treated fabric C.

D. The fabric was immersed in a solution (liquid temperature 25°C) made by mixing 46% sulfuric acid and 30% acetone, and then squeezed.
After being exposed to air at 0° C. for 3 minutes, it was immediately washed with water and neutralized, and then dried to obtain treated fabric D.

E, conventionally treated fabric; conventionally treated fabric E was obtained by crushing the fabric using only enzymes for 1 to 7 days.

A comparison of the texture, weight loss rate, fabric strength, and treatment time of each of the above-mentioned treated fabrics was as shown in the following table. Since this is a processing method for reducing the weight of cotton fabric treated as shown in the table above, according to this method, the target weight reduction processing of cotton fabric can be achieved in a few minutes of processing, which increases productivity and also allows for temperature control and pH control of the processing solution. This has the effect of making it easier to achieve high-quality silk-like processing.

According to the experiments conducted by the present inventor, when the concentration of sulfuric acid solution was 60% or more, the fabric hardened and lost its soft feel, and when the concentration was 45% or less, it was difficult to reduce the weight of the fabric. Also, if the acetone concentration is less than 10%, weight loss is difficult;
When the amount is 30% or more, weight loss is effectively achieved.

[Effects of the Invention] As described above, the present invention allows cotton fabric to be heated overnight in a solution containing 45 to 60% sulfuric acid and 10 to 30% acetone.

Claims (1)

[Claims] 1 Cotton cloth, 45-60% sulfuric acid and 10-3% acetone
A method for reducing the weight of cotton fabric, characterized by treating it with a solution containing 0%.