CN105155254B - A kind of discoloration method of yak hair - Google Patents

Abstract

The invention relates to a method for decolorizing yak hair, which is characterized in that the yak hair is firstly subjected to sizing and finishing, then subjected to ultrasonic treatment, and then decolorizing and finishing in supercritical carbon dioxide fluid. The whiteness of the yak hair fiber obtained after decolorization is 85-95%, and the breaking strength is above 1.60cN/tex.

Description

A kind of decolorization method of yak hair

technical field

The invention belongs to the technical field of animal fur decolorization, and relates to a technology for extracting pigments with supercritical carbon dioxide assisted by ultrasonic waves.

Background technique

Yak is one of the main livestock species in plateau pastoral areas. Its fibers are characterized by smoothness, good elasticity, and soft luster. It is a high-grade raw material for the wool spinning industry. However, because yak cashmere is mostly dark brown, its pigment is firm and difficult to decolorize, which restricts its application in the textile and garment industry. The color of yak hair is due to the distribution of pigment particles in its cortical cell wall. These pigment particles are covered with phospholipid-sterol bilayer membranes, and the internal structure also contains a large amount of phospholipid-sterol bilayer membranes. They serve as carriers, and the pigment substances are embedded in other superior. The vast majority of yak wool is dark brown and black.

However, most of the traditional decolorization processes use chemical methods for decolorization, which will cause serious environmental pollution and a large amount of waste of water resources. The application of supercritical carbon dioxide fluid technology can reduce the use of water; there are very few reports on the research and use of animal hair decolorization technology in a supercritical state, and there is no report on supercritical carbon dioxide decolorization under the assistance of ultrasonic waves.

Contents of the invention

Aiming at some problems existing in the traditional yak hair decolorization technology, the purpose of the present invention is to provide a brand-new ultrasonic-assisted decolorization technology for yak hair fibers using supercritical carbon dioxide extraction technology. The invention has no damage to fibers, no chemical residues, carbon dioxide can be recycled, and there is no sewage discharge in the whole process, and there is no pollution to the environment, which is in line with the current research trend of clean production at home and abroad.

The invention provides a method for decolorizing yak hair, which is characterized in that the yak hair is firstly subjected to sizing and finishing, then subjected to ultrasonic treatment, and then decolorizing and finishing in supercritical carbon dioxide fluid.

in particular:

(1) Sizing and finishing: the sizing and finishing slurry is prepared according to the weight ratio: 2-3 ferric citrate, 10-12 metalloprotease, 8-11 acid protease, 3-5 tartaric acid, 7-9 xylitol , dimethylformamide 8-10; the weight ratio of above-mentioned slurry and yak hair is 12-13:20; first iron citrate and half tartaric acid and xylitol are joined in dimethylformamide, stir 3 -5 minutes, then add metalloprotease and acid protease, stir for 2-3 minutes, then add the remaining half of tartaric acid and xylitol, stir for 2-3 minutes to obtain the slurry; soak yak hair into the slurry , the soaking time is 3-5 hours, and the temperature is 30-40°C;

(2) Ultrasonic treatment: Then put the finished yak hair and 3% citric acid into an ultrasonic instrument at 40-50°C. During ultrasonic treatment, the ultrasonic power is 30%-80%, and it is treated for 5-30 minutes, and then it does not need to be cleaned. , direct infrared radiation drying;

(3) Decolorization and finishing: Then put it into the supercritical carbon dioxide equipment, set the extraction pressure to 12-16Mpa, temperature 70-80°C, and time 20-30min, put the yak hair into the extraction kettle, Carbon dioxide, heat up and pressurize the incoming carbon dioxide to make the carbon dioxide reach a supercritical state, and start to decolorize. After the decolorization time is up; then set the pressure to be extracted at 18-20Mpa, the temperature at 90-100°C, and the time for 30 ~40min, after the decolorization time is up, the separation starts, and the extracted melanin is separated from the yak hair;

(4) Put the yak hair in the cleaning solution, the composition of the cleaning solution is sodium bisulfate: glucose: vitamin C: water=2-3:0.5-0.8:0.9-1.2:50, wash at 60-75°C for 20min ~40min, after washing, dry the yak hair fiber.

White yak hair is obtained by the above decolorization method, the whiteness of yak hair fiber is 85-95%, and the breaking strength is above 1.60cN/tex.

The outstanding features of the present invention are: 1. First arrange the enzyme and ferric citrate on the fiber, tartaric acid and xylitol in the slurry play a certain film-forming effect, which is beneficial to the combination of the reagent and the fiber without making it Not easy to peel off;

2. Under ultrasonic treatment, the scale layer of yak hair fiber is gradually opened, and the reagent can further penetrate into the fiber;

3. After testing and comparison, the whiteness of the yak hair fiber decolorized by the supercritical extraction method of the present invention is 85% to 95%, and the breaking strength is above 1.60cN/tex. While obtaining the same whiteness, the strength of the fiber is greatly retained.

Detailed ways

Example 1

(1) Sizing and finishing: the sizing and finishing slurry is prepared according to the weight ratio: iron citrate 2, metalloprotease 10, acid protease 8, tartaric acid 3, xylitol 7, dimethylformamide 8; the above pulp The weight ratio of material to yak hair is 12:20; first add ferric citrate, half of tartaric acid and xylitol into dimethylformamide, stir for 3 minutes, then add metalloproteinase and acid protease, stir for 2-3 minutes minutes, then add the remaining half of tartaric acid and xylitol, and stir for 3 minutes to obtain the slurry; soak the yak hair into the slurry, the soaking time is 3 hours, and the temperature is 30°C;

(2) Ultrasonic treatment: Then put the finished yak hair and 3% citric acid into an ultrasonic instrument at 40°C. In the ultrasonic treatment, the ultrasonic power is 30%, and the treatment is for 30 minutes. Then, it does not need to be cleaned, and is directly dried by infrared radiation;

(3) Decolorization and finishing: Then put it into the supercritical carbon dioxide equipment, set the pressure to be extracted to 12Mpa, the temperature to 70°C, and the time to 20min, put the yak hair into the extraction kettle, pass in carbon dioxide, and the The carbon dioxide is heated up and pressurized to make the carbon dioxide reach a supercritical state, and the decolorization is started. After the decolorization time is up; then set the pressure to be extracted to 18Mpa, the temperature is 90°C, and the time is 30-40min. After the decolorization time is up, start to carry out Separation, separating the extracted melanin from yak hair;

(4) Put the yak hair in the cleaning solution, the composition of the cleaning solution is sodium bisulfate: glucose: vitamin C: water = 2:0.5:0.9:50, wash at 60°C for 20minmin, after cleaning the yak hair fiber to dry.

The fiber whiteness of the obtained yak hair is 86.2%, and the breaking strength is 1.72cN/tex.

Example 2

(1) Sizing and finishing: the sizing and finishing slurry is prepared according to the weight ratio: iron citrate 3, metalloprotease 12, acid protease 11, tartaric acid 5, xylitol 9, dimethylformamide 10; The weight ratio of material to yak hair is 13:20; ferric citrate and half of tartaric acid and xylitol are first added to dimethylformamide, stirred for 5 minutes, then metalloproteinase and acid protease are added, stirred for 3 minutes, Then add the remaining half of the tartaric acid and xylitol, and stir for 3 minutes to obtain the slurry; soak the yak hair into the slurry, the soaking time is 5 hours, and the temperature is 40°C;

(2) Ultrasonic treatment: Then put the prepared yak hair and 3% citric acid into an ultrasonic instrument at 50°C. In the ultrasonic treatment, the ultrasonic power is 80%, and the treatment is for 30 minutes. Then, there is no need to wash it, and it is directly dried by infrared radiation;

(3) Decolorization and finishing: Then put it into the supercritical carbon dioxide equipment, set the pressure to be extracted at 16Mpa, the temperature at 80°C, and the time for 30 minutes, put the yak hair into the extraction kettle, and pass in carbon dioxide The carbon dioxide is heated up and pressurized to make the carbon dioxide reach a supercritical state, and the decolorization is started. After the decolorization time is up; then set the pressure to be extracted to 20Mpa, the temperature is 100°C, and the time is 40min. After the decolorization time is up, start to separate. Separating the extracted melanin from yak hair;

(4) Put the yak hair in the cleaning solution, the composition of the cleaning solution is sodium bisulfate: glucose: vitamin C: water = 3:0.8:1.2:50, wash at 75°C for 40 minutes, and wash the yak hair fiber after cleaning to dry.

The fiber whiteness of the obtained yak hair is 93.5%, and the breaking strength is 1.63cN/tex.

comparative example

(1) Sizing and finishing: the sizing and finishing slurry is prepared according to the weight ratio: iron citrate 3, metalloprotease 12, acid protease 11, tartaric acid 5, xylitol 9, dimethylformamide 10; The weight ratio of material to yak hair is 13:20; ferric citrate and half of tartaric acid and xylitol are first added to dimethylformamide, stirred for 5 minutes, then metalloproteinase and acid protease are added, stirred for 3 minutes, Then add the remaining half of the tartaric acid and xylitol, and stir for 3 minutes to obtain the slurry; soak the yak hair into the slurry, the soaking time is 5 hours, and the temperature is 40°C;

(2): Then put the prepared yak hair and 3% citric acid into a water bath at 50°C, soak for 30 minutes, and then directly dry by infrared radiation without washing;

(3) Decolorization and finishing: Then put it into the supercritical carbon dioxide equipment, set the pressure to be extracted at 16Mpa, the temperature at 80°C, and the time for 30 minutes, put the yak hair into the extraction kettle, and pass in carbon dioxide The carbon dioxide is heated up and pressurized to make the carbon dioxide reach a supercritical state, and the decolorization is started. After the decolorization time is up; then set the pressure to be extracted to 20Mpa, the temperature is 100°C, and the time is 40min. After the decolorization time is up, start to separate. Separating the extracted melanin from yak hair;

(4) Put the yak hair in the cleaning solution, the composition of the cleaning solution is sodium bisulfate: glucose: vitamin C: water = 3:0.8:1.2:50, wash at 75°C for 40 minutes, and wash the yak hair fiber after cleaning to dry.

The fiber whiteness of the obtained yak hair is 82.5%, and the breaking strength is 1.68cN/tex.

It can be seen that the assistance of ultrasonic waves is more conducive to improving the stripping efficiency of yak hair.

Unless otherwise specified, the proportions, parts, proportions, etc. in this application all refer to the weight.

The above describes the technical principles of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention, and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present invention without creative efforts, and these modes will all fall within the protection scope of the present invention.

Claims (1)

1. a kind of discoloration method of yak hair, it is characterised in that sizing finish first is carried out to yak hair, is then carried out at ultrasonic wave Reason, then carries out decoloration arrangement in supercritical carbon dioxide fluid, is specially：

（1）Sizing finish：The slurry of the sizing finish is according to weight：Ironic citrate 2-3, metalloproteinases 10- 12, acid protease 8-11, tartaric acid 3-5, xylitol 7-9, dimethylformamide 8-10；The weight of above-mentioned slurry and yak hair Than for 12-13:20；First the tartaric acid and xylitol of ironic citrate and half are added in dimethylformamide, 3-5 points of stirring Clock, adds metalloproteinases, acid protease, stirs 2-3 minutes, is subsequently added into remaining half tartaric acid and xylitol, stirs Mix 2-3 minutes, obtain the slurry；Yak hair is impregnated into the slurry, when dip time is 3-5 small, temperature 30-40 ℃；

（2）Ultrasonication：Then the yak hair put in order and 3% citric acid are put into togerther to 40-50 DEG C of ultrasonic instrument In, ultrasonic power 30W-80W in supersound process, handles 5-30min, then need not clean, and directly carries out infrared radiation and does It is dry；

（3）Decoloration arranges：It is subsequently placed into supercritical carbon dioxide equipment, sets the 12~16MPa of pressure to be extracted, temperature 70~80 DEG C of degree, and 20~30min of time, yak hair is put into extraction kettle, is passed through carbon dioxide, to the carbon dioxide being passed through Heat up, pressurize, carbon dioxide is reached supercriticality, decoloration is proceeded by, after bleaching time has arrived；Then set 18~the 20MPa of pressure to be extracted well, 90~100 DEG C of temperature, and 30~40min of time, bleaching time reach after, start into Row separation, the melanin extracted is separated with yak hair；

（4）Yak hair is placed in cleaning solution, the composition of cleaning solution is niter cake：Glucose：Vitamin C：Water=2-3:0.5- 0.8：0.9-1.2：50,20min~40min is washed at 60~75 DEG C, yak wool fibre is dried after having cleaned, is obtained Yak hair fibre whiteness be 85-95%, fracture strength is more than 1.60cN/tex.