JPH02264009A - Sericin scouring control of raw silk - Google Patents

Abstract

PURPOSE:To obtain silk fiber in a desired scouring state regulated according to the amount of protease to be used without impairing its feeling by treating raw silk, without application of pretreatment to swell the sericin contained, with a proteasecontg. treating bath followed by washing with water. CONSTITUTION:Raw silk is treated, without application of pretreatment to swell the sericin contained, with a treating bath at pH9-10 and temperature 50-60 deg.C, containing such an amount of protease as to enable the resulting silk fiber to be in a desired scouring state [pref. a treating bath containing a pH adjustor with the weight ratio of sodium bicarbonate to sodium carbonate = (1: 3) (3:1), a reducing agent such as neutral sodium sulfite and a nonionic surfactant] for >=5 (pref. 10-20)min followed by washing with water, thus obtaining the objective silk fiber uniformly treated and being in a desired scouring state.

Description

DETAILED DESCRIPTION OF THE INVENTION -1 The present invention relates to a raw silk scouring method that can control the WK of sericin.

Ichigo "F Ushi" 1 Various studies have been conducted to expand the use of sericin if it is possible to control the loss of sericin due to scouring of raw silk.
Some attempts have been made to implement the following methods, but none of these methods could be put into practical use due to problems such as uneven kneading of the product and poor texture.

+11 A method of treating with soap or soda salt at a treatment temperature of 70 to 80°C for 15 to 30 minutes, then adding hydrosulfide to stop the scouring.

f2+ t* A method of adding ammonia and a softener to the waste solution and soaking it overnight.

(3) Treatment temperature 4 with nonionic surfactant and softener
A method of processing at 0 to 60°C for 20 to 40 minutes.

The present invention improves these drawbacks and allows the user to freely select the kneading loss of sericin, controlling the kneading loss to a desired level such as kneading for 3 minutes, 5 minutes, 8 minutes, etc., to improve quality. The goal is to provide a method that enables good refinement.

In the present invention, a proteolytic enzyme is used to
This problem was solved by refining raw silk.

That is, in the method of the present invention, raw silk is heated to 50 to 60% by pretreatment in a treatment bath adjusted to p119 to 10 and containing an amount of protease corresponding to the desired kneading loss without causing the sericin to swell. It is characterized by being treated at a temperature of °C for 5 minutes or more and then washed with water.

In conventional enzyme scouring, it is essential to scouring sericin after it has been swollen by high-temperature treatment at an alkaline external temperature.However, by scouring sericin while it is swollen, the decomposition of sericin can be controlled. It was impossible to do so, and it was never thought that enzymatic refining could control the loss of refining.

In such enzyme scouring, the present invention makes it possible to freely control the loss of raw silk by scouring the raw silk in a specific treatment bath without performing the above-mentioned pretreatment.

The scouring treatment bath used in the present invention contains, for example, a proteolytic enzyme, a pH adjuster, and a surfactant, and as the proteolytic enzyme, any one used in normal enzyme scouring can be used. It is.

The amount of protease used varies depending on the desired kneading loss and the type of proteolytic enzyme used, but when treated with the method of the present invention, the relationship between the amount of protease used (relative to fiber weight) and the kneading loss is As shown in the examples below, the raw silk is almost linear, so the raw silk is refined by changing the amount of proteolytic enzyme used in advance, and the amount of proteolytic enzyme used and the loss of kneading are determined. The relationship can be expressed in a graph, and from this graph, the amount of proteolytic enzyme corresponding to the desired kneading loss can be found and used.

The pn of the treatment bath may be adjusted to a range of 9 to 10 by adding a suitable alkaline substance, but in general, it is preferable to use sodium bicarbonate, sodium carbonate, etc. as the pH adjuster, and in particular, sodium bicarbonate and carbonate. Preference is given to using soda in a weight ratio of 1:3 to 3:1.

In addition, it is preferable to add a small amount of a weak reducing agent such as neutral sodium sulfite, hydrosulfide, hypo, sodium bisulfite, etc. to the treatment bath as an enzyme reaction promoter. is preferred.

Next, a treatment temperature of 50 to 60°C is used, but this is because the enzyme becomes inactive at low temperatures, and if it exceeds 60°C, the enzyme will die (refining will be incomplete and there will be no loss of polishing). This is because control becomes impossible.

Incidentally, it is preferable to add a surfactant to the treatment bath in order to enhance the penetration effect, and it is particularly preferable to add a small amount of a nonionic surfactant.

In the method of the present invention, scouring can be carried out almost completely in about 5 minutes, but it is preferable to carry out the scouring for 10 to 20 minutes. Also,
It is preferable to wash with hot water so that decomposed sericin does not remain on the fibers. The temperature of hot water washing may be about 70 to 90°C.

Example Six types of raw silk shown in Table 1 were kneaded for 3 minutes, 5 minutes, and 8 minutes to achieve the desired wltI without high-temperature pretreatment.
Depending on the conditions, each sample was immersed in the treatment bath described in 1) below, and then washed in hot water in 2).

In addition, the pi of the treatment bath was 9 to 10 in all cases.

Soybean paste l) Enzyme-1 > 0.3% (based on fiber weight)
Enzyme auxiliary *f1 4% (based on fiber weight) Larsen Power - 111% (based on fiber weight) Bath ratio: l: 20-30 Temperature: 50-60°C Time = 10-20 minutes 2) Hot water washing temperature near 0-90 °C Time = 10-20 minutes "Double" I) Enzyme $1) 1% (weight of fiber Enzyme auxiliary 1) 7% (weight of fiber) Larsenbauer 0'1% (weight of fiber) Bath ratio: 1:2
0-30 Temperature: 50-60°C Time: 10-20 minutes 2) Hot water washing temperature near 0-90°C Time: 10-20 minutes ΣLL CH 1) Enzyme width) 2% (based on fiber weight) Enzyme auxiliary * 1) 10% (to fiber weight N) Rahsenbauer-111% (to fiber weight) Bath ratio: 1:20
~30 Temperature: 50~60℃ Time: 10~20 minutes 2) Hot water washing temperature -70~90℃ Time: 10~20 minutes 1) Bacterial alkaline protease - 2) Sodium bicarbonate, soda carbonate, and neutral sodium sulfite 2:2:1 blend (weight ratio) $3) Highly decomposable scouring detergent (nonionic surfactant) from Koshindo Chemical Industry Co., Ltd. As shown in Table 1, for all raw silks, 3 minutes After kneading, kneading for 5 minutes, and kneading for 8 minutes, a uniform product of good quality was obtained with the desired MI reduction rate.

Table 1 Effects of the Invention In the present invention, it is possible to uniformly scouring silk lli fibers without impairing its texture, and by adjusting the amount of proteolytic enzyme used, the desired amount of kneading loss can be achieved. You can control refinement to the state of.

Claims (1)

[Claims] The raw silk is treated in advance for 5 minutes or more in a treatment bath at 50 to 60°C that has been adjusted to pH 9 to 10 and contains an amount of proteolytic enzyme corresponding to the desired kneading loss without swelling the sericin contained in the raw silk. A method for controlling the loss of sericin in raw silk, which is characterized by washing with water.