CN114427171A

CN114427171A - Regenerated cellulose fiber cheese and reactive dye dyeing method thereof

Info

Publication number: CN114427171A
Application number: CN202210264497.2A
Authority: CN
Inventors: 沈吉芳; 陈文淼; 程文青; 詹磊; 刘今强; 王际平
Original assignee: Zhejiang Lvyu Textile Technology Co ltd
Current assignee: Zhejiang Lvyu Textile Technology Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-05-03

Abstract

The invention relates to the technical field of dyeing and finishing, in particular to regenerated cellulose fiber cheese and a reactive dye dyeing method thereof. The regenerated cellulose fiber cheese is dyed by reactive dye, the soaping fastness of the dyed regenerated cellulose fiber cheese under the national standard GB/T3921-2008 is 4-5 grade, the dry friction fastness under the national standard GB/T3920-2008 is 4-5 grade, the wet friction fastness is 3-4 grade, and the color depth under the national standard GB/T4841.7-2006 can reach 2/1 standard depth.

Description

Regenerated cellulose fiber cheese and reactive dye dyeing method thereof

Technical Field

The invention relates to the technical field of dyeing and finishing, in particular to regenerated cellulose fiber cheese and a reactive dye dyeing method thereof.

Background

The regenerated cellulose fiber is made from natural cellulose (cotton, hemp, bamboo, tree, shrub) as raw material, and the physical structure of the natural cellulose is changed without changing its chemical structure, so that the fiber with better performance is produced. Common regenerated cellulose fibers include viscose, tencel, modal, bamboo fiber, cuprammonium fiber and the like.

At present, the main dyeing method for dyeing the regenerated cellulose fiber cheese by using the reactive dye is a dye vat water bath dyeing method. The dyeing method has the advantages of large dyeing water bath ratio, low dye uptake and fixation rate and dye utilization rate of about 70 percent. In addition, a great part of dye can not be fixed on the regenerated cellulose fiber, and a large amount of water is needed for washing the dye to achieve the requirement of fastness. The dyeing method wastes water resources and pollutes the water environment. In addition, a large amount of salt is required to be added in the dyeing process of the dyeing method to accelerate the dyeing, a large amount of dye and salt exist in the wastewater, the wastewater treatment difficulty is high, and the wastewater recycling proportion is low.

CN107794788A discloses a silicon-based non-aqueous medium dyeing method suitable for cheese. In the scheme, the dye is directly added in a chemical manner, and the common problem of dyeing by the reactive dye in a non-aqueous medium can be highlighted in the adding manner. Specifically, since most of the water is adsorbed on the regenerated cellulose fiber cheese, the chance of the dye contacting the regenerated cellulose fiber cheese increases, the dyeing is too fast, and the phenomenon of uneven dyeing is easily caused. In addition, the feeding mode of the scheme can cause the local pH value in the dye bath to be increased rapidly, so that the hydrolysis phenomenon of the dye is increased under the condition of high pH value, and the reaction speed of the local dye and the fiber is too high, so that the uneven dyeing phenomenon is caused.

Disclosure of Invention

In view of the above-mentioned disadvantages and problems of the prior art, it is an object of the present invention to provide a regenerated cellulose fiber cheese and a reactive dyeing method thereof, which can improve the utilization rate of dye, level dyeing property, and reduce the generation of dyeing waste water, and reduce the amount of salt used, so that the treatment of the dyeing waste water is simple, and the reuse rate of the dyeing waste water is improved when the regenerated cellulose fiber cheese is dyed with a non-aqueous medium.

In a first aspect, the colored regenerated cellulose fiber cheese is provided, and is dyed by reactive dyes, wherein the soaping fastness of the dyed regenerated cellulose fiber cheese under the national standard GB/T3921 + 2008 is 4-5, the dry rubbing fastness under the national standard GB/T3920 + 2008 is 4-5, the wet rubbing fastness is 3-4, and the color depth under the national standard GB/T4841.7-2006 can reach 2/1 standard depth.

In one embodiment, the regenerated cellulose fiber cheese is any one of viscose cheese, natural silk cheese, bamboo fiber cheese, modal cheese, chitin fiber cheese and cuprammonium fiber cheese.

In one embodiment, the reactive dye has a fixation rate of not less than 80%, an uptake rate of not less than 99%, and a level dyeing property of 4-5 grade; the reactive dye is any one or the combination of at least two of reactive black G, reactive navy blue L-3G and reactive red L-S.

In a second aspect, a method for dyeing regenerated cellulose fiber cheese reactive dye based on a non-aqueous medium is provided, which comprises the following steps:

(1) squeezing water: pressurizing and squeezing water for the regenerated cellulose fiber cheese subjected to water-based treatment in a dye vat, wherein the pressurizing pressure is 0.01-0.4 MPa, so that the water content of the regenerated cellulose fiber cheese is 50-300% (owf.);

(2) adding a dyeing solution: adding a non-aqueous medium into the dye vat according to the mass ratio of the non-aqueous medium to the regenerated cellulose fiber cheese of (1.5: 1) - (30: 1); then, adding a first mixed solution of a non-aqueous medium and a dye solution into the dye vat; wherein when the first mixed solution is added into the dye vat, the feeding is carried out according to a first linear feeding mode of slow feeding and fast feeding, and the dye bath temperature is 5-40 ℃; wherein, after the first mixed solution is added, the temperature of the dye bath is controlled to be 5-40 ℃ for 10-60 min; after the first mixed solution is added, the mass ratio of the non-aqueous medium to the regenerated cellulose fiber cheese in the dye vat is (2: 1) - (30.5: 1); wherein the dye liquor consists of 0.1-30% (owf.) of reactive dye and 10-250% (owf.) of water;

(3) adding alkaline solution: adding a second mixed solution of a non-aqueous medium and an alkali liquor into the dye vat; wherein, when the second mixed solution is added into the dye vat, the dye bath temperature is 5-40 ℃; wherein, after the second mixed solution is added, the temperature of the dye bath is controlled to be 5-50 ℃ for 10-60 min; after the second mixed solution is added, the mass ratio of the non-aqueous medium to the regenerated cellulose fiber cheese in the dye vat is (3: 1) - (31.5: 1); wherein the alkali liquor consists of 0.1-30% (owf.) alkali and 30-250% (owf.) water;

(4) and (3) heating: the heating rate is controlled to be 0.1-1.5 ℃/min, the heat preservation temperature after heating is controlled to be 40-100 ℃, and the heat preservation time after heating is 10-200 min;

(5) washing for 2-5 times, wherein the water consumption for single washing is not more than 4(owf.), the washing temperature is 20-100 ℃, and the single washing time is 1-30 min;

(6) and (6) drying.

In one embodiment, the first linear feeding manner is specifically: the initial feeding speed is 0-10L/min, the final feeding speed is 5-100L/min, the feeding time is 1-100min, and the feeding speed is increased along with the change of time.

In one embodiment, when the second mixed liquor is added into the dye vat, feeding is carried out according to a second linear feeding mode of slow feeding and fast feeding; the second linear feeding mode specifically comprises the following steps: the initial feeding speed is 0-10L/min, the final feeding speed is 5-100L/min, the feeding time is 1-100min, and the feeding speed is increased along with the change of time.

In one embodiment, the non-aqueous medium is a liquid and has a surface tension of 1-60mN/m at 20 ℃.

In one embodiment, the non-aqueous medium is any one of a hydrocarbon, a silicon-based hydrocarbon, a cyclic methyl siloxane, a liquid paraffin, or a combination of at least two thereof.

In one embodiment, the reactive dye is any one or a combination of at least two of reactive black G, reactive navy blue L-3G and reactive red L-S, and the alkali in the alkali liquor is one or a combination of at least two of sodium phosphate, sodium silicate, sodium carbonate, sodium hydroxide, sodium monohydrogen phosphate, sodium dihydrogen phosphate and sodium bicarbonate; the color fixing rate of the reactive dye is not less than 80%, the dye uptake is not less than 99%, and the level-dyeing property is 4-5 grade.

In a third aspect, there is provided a regenerated cellulose fiber cheese dyed according to the method of the second aspect.

In the dyeing bath of the regenerated cellulose fiber cheese adopted in the method for dyeing the regenerated cellulose fiber cheese by using the reactive dye, most of liquid is a non-aqueous medium, the using amount of water is very small, the dye is only dissolved in water but not dissolved in the non-aqueous medium, most of water is adsorbed on the regenerated cellulose fiber cheese, and therefore most of dye is adsorbed on the regenerated cellulose fiber cheese, and the dye uptake can be close to 100%. In addition, as alkali is only dissolved in water but not in a non-aqueous medium, the reactive dye dyed on the regenerated cellulose fiber cheese has proper alkaline conditions, the fixation rate is improved, and the average fixation rate can reach more than 93 percent. Compared with the traditional water bath dyeing, the effect saves more than 20% of reactive dye, does not need to add salt, reduces the material cost of dyeing, simultaneously reduces the proportion of the flooding dye needing to be washed from about 30% to less than 7% and to 1/3 of the traditional water bath dyeing, thereby reducing the washing times and reducing the washing water quantity from about 60 times (owf.) of the traditional water bath dyeing to 16 times (owf.). In addition, the single-cylinder level-dyeing grade of the regenerated cellulose fiber cheese reactive dye dyeing method provided by the embodiment of the application can reach 4-5 grades, is obviously superior to 3-4 grades of a non-aqueous medium dyeing method in CN107794788A, has small cylinder difference, and is easier to popularize and industrialize. Because no salt is added in the dyeing process, the salt content and the dye content in the dyeing wastewater are both very low, and the subsequent water treatment is simple.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

The embodiment of the application provides a regenerated cellulose fiber cheese which is dyed by reactive dyes, the soaping fastness of the dyed regenerated cellulose fiber cheese under the national standard GB/T3921-grade 2008, the dry friction fastness under the national standard GB/T3920-grade 2008 is 4-5, the wet friction fastness is 3-4, and the color depth under the national standard GB/T4841.7-2006 can reach the 2/1 standard depth.

The regenerated cellulose fiber cheese can be prepared by a non-aqueous medium dyeing method of the regenerated cellulose fiber cheese reactive dye, which is introduced below.

The embodiment of the application provides a non-aqueous medium dyeing method of regenerated cellulose fiber cheese reactive dye, which can be used for dyeing regenerated cellulose fiber cheese with reactive dye. By adopting the method, when the regenerated cellulose fiber cheese is dyed by the reactive dye, the utilization rate of the reactive dye can be improved to more than 93 percent, namely the fixation rate (the fixation rate refers to the percentage of the dye which is subjected to covalent bond reaction with cellulose fibers and accounts for the total input amount of the dye) is more than 93 percent. That is, 93% or more of the reactive dye is fixed on the regenerated cellulose fiber, and less than 7% of the reactive dye is not fixed on the regenerated cellulose fiber, so that a large amount of water washing is not needed, and the generation of dyeing wastewater is reduced. In addition, in the dyeing process, extra salt is not needed, so that the dyeing wastewater treatment is simple, and the dyeing wastewater reuse rate can be improved. In addition, the method has high color fixing rate, and can prepare the regenerated cellulose fiber cheese with soaping fastness of 4-5 grade under the national standard GB/T3921-2008, dry friction fastness of 4-5 grade under the national standard GB/T3920-2008, wet friction fastness of 3-4 grade, and color depth of 2/1 standard depth under the national standard GB/T4841.7-2006.

In summary, in the method for dyeing the regenerated cellulose fiber cheese provided by the embodiment of the application, the squeezing water before dyeing is introduced to accurately control the moisture content of the regenerated cellulose fiber cheese before dyeing, so that the problem of cylinder difference caused by different moisture contents of the regenerated cellulose fiber cheese before dyeing can be solved while the dyeing effect of the subsequent dyeing process is improved.

In the implementation process of the regenerated cellulose fiber cheese dyeing method provided by the embodiment of the application, the dye liquor is stirred together with the non-aqueous medium in the material cylinder, linear feeding is carried out while stirring, the feeding is slow and then fast, the dye liquor is dispersed in the non-aqueous medium in advance by the feeding mode, the contact speed of the dye liquor and the regenerated cellulose fiber cheese is reduced, the dyeing rate is reduced, the leveling property of the non-aqueous medium cheese dyeing is improved, and finally most of the dye liquor is still adsorbed on the regenerated cellulose fiber cheese, so that the dyeing rate is not negatively influenced. In addition, the alkali liquor feeding mode in the embodiment of the application disperses the alkali liquor in the non-aqueous medium in advance, so that the alkali liquor is slowly and uniformly adsorbed on the regenerated cellulose fiber cheese, the pH value slowly and uniformly rises, the dye hydrolysis is slowed down, the alkali can be quickly and uniformly distributed on the regenerated cellulose fiber cheese, the condition that the local alkali concentration is too high cannot occur, and the level-dyeing property is improved. Through tests, the level-dyeing grade of the finished regenerated cellulose fiber cheese dyed by the dyeing method provided by the embodiment of the application is not lower than 4-5.

Next, a process flow of the regenerated cellulose fiber cheese dyeing method provided in the embodiment of the present application will be described.

The method comprises the following process steps.

1. Preparation of dye liquor

The formula is as follows

Reactive dyes: 0.1% -30% (owf.). Illustratively, the reactive dye can be any one of or a combination of at least two of reactive black G, reactive navy blue L-3G, and reactive red L-S. It should be noted that the reactive dyes that can be used in the embodiments of the present application are only exemplified and not limited herein. In other embodiments, other reactive dyes may also be used, and are not described in detail herein. Wherein owf represents the percentage of the material to be dyed relative to the weight of the material to be dyed. Such as: under certain conditions, the dye amount of 100 kg of fabrics is 4% (owf), that is, 100x0.04 kg of dye is needed for dyeing the fabrics.

The solvent is water, and the dosage is between 10 percent and 250 percent (owf.).

2. Preparing alkali liquor

Alkali: 0.1% -30% (owf.)

The usable range of the base is as follows: sodium phosphate, sodium silicate, sodium carbonate, sodium hydroxide, sodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium bicarbonate, or a combination of at least two thereof.

The solvent is water, and the dosage is between 30 percent and 250 percent (owf).

3. Dyeing process

The dyeing process is as follows

A. Squeezing water

The refined and washed regenerated cellulose fiber cheese needs pressurization and water squeezing, the step is realized through a special dye vat for the non-aqueous medium regenerated cellulose fiber cheese, the pressurization pressure is between 0.01MPa and 0.4MPa, and the water content of the regenerated cellulose fiber cheese after water squeezing is between 50 percent and 300 percent (owf.). The special dye vat for the non-aqueous medium regenerated cellulose fiber cheese used in the method has the functions of pressurizing and squeezing water. For example, the non-aqueous medium regenerated cellulose fiber cheese special dye vat adopted by the method can be as follows: ultra-low bath ratio high temperature and high pressure CLEANCOLOUR non-aqueous medium dyeing machine manufactured by high-gawa Green Intelligence equipment (Guangzhou) Co.

B. Dyeing process

The dyeing is realized by the special dye vat for the non-aqueous medium regenerated cellulose fiber cheese, and a dye bath during dyeing consists of a large amount of non-aqueous medium and a small amount of water. Wherein, under the condition that the total bath ratio is kept unchanged, the water used for flowing, heat conduction and other purposes in the traditional water bath dyeing is changed into a non-aqueous medium (the non-aqueous medium does not dissolve the reactive dye), and only a small amount of water is left for dissolving the dye and the alkali and providing a reaction environment. Under the condition, most of dyes are adsorbed on the regenerated cellulose fiber cheese under the condition of no salt accelerating, so that the dye-uptake rate is improved, on the basis, the part of water has stronger alkalinity, and the dyes dyed on the fibers are easier to chemically react with the fibers and are fixed on the fibers, so that the color fixation rate is improved, and the dye utilization rate is improved.

After the regenerated cellulose fiber cheese is subjected to water squeezing treatment by using a dye vat, a nonaqueous medium is added into the dye vat. Wherein the mass ratio of the added non-aqueous medium to the regenerated cellulose fiber cheese is (1.5: 1) - (30: 1).

Adding a dye liquor into the dye vat, wherein the amount of the dye liquor is determined by the formula of the dye liquor in the step 1 and the quality of the regenerated cellulose fiber cheese. Specifically, the dye liquor may be mixed with a non-aqueous medium by stirring the dye liquor in a vat together with another non-aqueous medium (i.e., the non-aqueous medium is not taken out of the vat). Then adding a dye liquor mixed with a non-aqueous medium into the dye red. When the dye vat is filled with dye liquor, the temperature of the dye bath is controlled at 5-40 ℃. Wherein, the lower the temperature, the less the dye is hydrolyzed, and the temperature can be controlled to achieve the purpose of reducing the hydrolysis of the reactive dye and improve the dye uptake. When the dye liquor is added into the dye vat, the dye liquor is stirred, and a linear feeding mode is used for feeding (namely, the dye liquor mixed with the non-aqueous medium is added), the speed is slow first and then is fast, so that the dye liquor can be relatively uniformly distributed in the non-aqueous medium in a small-droplet mode, the contact between the dye liquor and the regenerated cellulose fiber cheese is slowed down, the dye is slowly dyed on the regenerated cellulose fiber cheese, the dyeing slowing effect is achieved, the level-dyeing property of the regenerated cellulose fiber cheese is improved, and the defect of poor level-dyeing property caused by the fact that the non-aqueous medium is dyed too fast is overcome.

In the dye liquor adding mode, the dye liquor and the non-aqueous medium are mixed in advance in the dye vat because the non-aqueous medium is in the dye vat, and then the dye liquor is added into the dye vat, so that the dye liquor is prevented from directly contacting fibers under the condition that the dye liquor is not uniformly mixed with the non-aqueous medium after being directly added into the dye vat, and color and luster are easily caused.

Wherein, the linear feeding mode can be specifically as follows: the initial feeding speed is 0-10L/min, the end feeding speed is 5-100L/min, the feeding time is 1-100min, the feeding speed is increased along with the change of time, the parameter adjustable range of the feeding speed change is 0-100, the larger the parameter is, the smaller the initial feeding speed is, and the speed change in a period of time at the beginning is smaller. The dye vat adopted by the method has a linear feeding function, and the linear feeding mode can be implemented.

And after the dye liquor is added, the heat preservation time at 5-40 ℃ is controlled to be 10-60min, and the mass ratio of the regenerated cellulose fiber cheese to the non-aqueous medium is 1:2-1: 30.5.

When adding alkali, the temperature of the dye bath is controlled to be 5-40 ℃, the temperature control is crucial under the alkaline condition, on one hand, the lower the temperature is, the less the dye is hydrolyzed, the temperature control can achieve the purpose of reducing the hydrolysis of the reactive dye, and the color fixing rate is improved, on the other hand, the alkali liquor needs to be uniformly dispersed on the regenerated cellulose fiber cheese at the low temperature, otherwise, if the temperature is too high under the condition of uneven alkali liquor, the place with high alkali liquor concentration can quickly react, and the place with low alkali liquor concentration basically does not react, so that the phenomenon of uneven dyeing is caused.

Adding alkali liquor into the dye vat. Wherein, the amount of the added alkali liquor is determined by the formula of the alkali liquor in the step 2 and the quality of the regenerated cellulose fiber cheese. Specifically, the alkali solution may be stirred in the vat together with another non-aqueous medium (i.e., the non-aqueous medium is not taken out of the vat) to obtain the alkali solution mixed with the non-aqueous medium. Then adding alkali liquor mixed with non-aqueous medium into the dyed red. When the alkali liquor is added into the dye vat, the alkali liquor and the nonaqueous medium in the material vat are stirred, the linear feeding mode is used for feeding (namely the alkali liquor mixed with the nonaqueous medium) at the same time, the speed is slow first and then fast, so that the alkali liquor can be relatively uniformly distributed in the nonaqueous medium in a small-drop mode, the contact between the dye liquor and the regenerated cellulose fiber cheese is slowed down, the alkali liquor is slowly adsorbed onto the regenerated cellulose fiber cheese, the pH value of the whole dye bath can be slowly and uniformly increased, the dyeing defect caused by the sudden change of the pH value is avoided, the level-dyeing property of the regenerated cellulose fiber cheese is improved, and the defect of poor level-dyeing property caused by the fast dyeing of the nonaqueous medium is further improved. And after the alkali is added, the heat preservation time at 5-50 ℃ is controlled to be 10-60min, and the ratio of the regenerated cellulose fiber cheese to the non-aqueous medium is 1:3-1: 31.5.

And (3) heating: during temperature rise, the temperature rise rate is controlled to be 0.1-1.5 ℃/min, the heat preservation temperature after temperature rise is controlled to be 40-100 ℃, and the heat preservation time after temperature rise is controlled to be 10-200 min.

Wherein, the linear feeding mode of the alkali liquor can be realized by referring to the linear feeding mode of the dye liquor, and the description is omitted.

Wherein, the non-aqueous medium adopted by the method needs to be liquid, and the surface tension is controlled to be 1-60mN/m (20 ℃). The non-aqueous medium employed in the process may be any one of hydrocarbons, silicon-based hydrocarbons, cyclic methyl siloxanes, liquid paraffins or a combination of at least two thereof.

In this specification, unless otherwise specified, the mass of the regenerated cellulose fiber cheese is the mass of the dried regenerated cellulose fiber cheese, that is, the mass of the cheese which has not been subjected to the water washing stage before dyeing.

C. Washing machine

The washing is realized by the special dye vat for the non-aqueous medium regenerated cellulose fiber cheese, and the dyeing step improves the utilization rate of the dye, so that the washing pressure is reduced, the washing times are reduced, no salt is added, the contents of the dye and the salt in the dyeing wastewater are very low, and the treatment and the recycling are convenient. The whole washing process comprises the steps of controlling the washing frequency between 2 and 5 times, controlling the water consumption of single washing to be not more than 4 times (owf.), controlling the total washing water to be less than 8 times to 20 times (owf.), controlling the washing temperature to be between 20 and 100 ℃ and controlling the single washing time to be between 1min and 30 min.

D. Drying the mixture

Drying is achieved by a dryer.

Next, in specific examples, the regenerated cellulose fiber cheese dyeing method provided in the examples of the present application is exemplified.

Example 1, a black viscose cheese was prepared.

Viscose cheese to be dyed: 40 counts of viscose cheese.

Viscose cheese to be dyed: 288 kg.

The dye solution formula comprises:

active black G: 5% (owf.);

the method comprises the following steps of (1) using water for dyeing: 40% (owf.).

Alkali liquor formula:

soda ash: 15% (owf.);

water for alkali dissolution: 60% (owf.).

Dyeing process and parameters

11. Weighing and melting the materials.

12. Squeezing water before dyeing, namely putting the viscose cheese after refining and squeezing water into a special dye vat for the non-aqueous medium regenerated cellulose fiber cheese, wherein the pressurizing pressure is 0.15MPa when squeezing water, and the moisture content of the viscose cheese after squeezing water is 200% (owf.). In the present embodiment, the dye vat dedicated for the non-aqueous medium regenerated cellulose fiber cheese may be simply referred to as a dye vat unless otherwise specified.

13. Adding a nonaqueous medium, and putting the nonaqueous medium into a dye vat, wherein the mass ratio of the viscose cheese to the nonaqueous medium is 1:3.

14. Adding dye liquor, adding the dye liquor into a material vat of a dye vat through an automatic feeding system, adding a non-aqueous medium, stirring, and injecting the dye liquor into the dye vat in a side linear feeding manner (namely the dye liquor mixed with the non-aqueous medium). The dye bath temperature when the dye liquor is added into the dye vat is 30 ℃, the heat preservation time is 40min at 32 ℃ after the dye liquor is added, and the ratio of the viscose cheese to the nonaqueous medium is 1: 3.5.

15. Adding alkali, namely adding an alkali solution into a material vat of the dye vat through an automatic feeding system, adding a non-aqueous medium, stirring, and adding a linear material (namely the alkali solution mixed with the non-aqueous medium) into the dye vat. The dye bath temperature when the alkali liquor is added into the dye vat is 33 ℃, the heat preservation time is 30min at 35 ℃ after the alkali is added, and the ratio of the viscose cheese to the non-aqueous medium is 1:4.

16. Heating, wherein the heating rate is controlled at 1 ℃/min.

17. And (4) preserving heat, wherein the heat preservation temperature is 60 ℃ after the temperature is raised, and the heat preservation time is 70 min.

18. Washing, wherein the washing temperature is 80 ℃, the single washing time is 10min, the washing times are 3 times, and the water consumption for each washing is 4 times (owf.). The total wash water usage for 3 washes was 12 times (owf.).

19. And (5) drying.

20. The dye uptake (dye uptake is the ratio of dye adsorbed onto fiber from dye liquor before the dye is fixed by soda) is 99%, the fixation rate is 93%, and the level-dyeing property is 4-5 grade. Wherein the leveling property can be determined by: weaving the cheese into cloth, measuring DE value at a certain number of positions on the cloth surface, wherein the value is less than 0.8, and the level-dyeing property is 4-5 grade.

21. The indexes of the viscose cheese finished product are shown in table 1.

And testing the main fastness of the finished regenerated cellulose fiber cheese according to the national standards GB/T3921-2008 and the national standards GB/T3920-2008. The test results are shown in table 1.

TABLE 1

Fastness to soaping	Fastness to dry rubbing	Fastness to wet rubbing
			4-5 stages	4-5 stages	Grade 3-4

In addition, through detection, the level-dyeing property of the finished viscose cheese can meet the customer requirements, and no difference between an inner layer and an outer layer exists; the yarn strength of the finished viscose cheese can meet the requirements of customers; the flexibility of the yarn can meet the weaving requirement; the cloth cover effect and the hand feeling effect of the woven yarn can meet the requirements of customers.

Example 2, navy blue tencel yarn.

The tencel cone yarn to be dyed: 32 tencel cheese.

The quality of the tencel cheese to be dyed is as follows: 288 kg.

The dye solution formula comprises:

active navy blue L-3G: 3% (owf.);

the method comprises the following steps of (1) using water for dyeing: 30% (owf.).

Alkali liquor formula:

soda ash: 10% (owf.);

water for alkali dissolution: 50% (owf.).

Dyeing process and parameters

21. Weighing and melting the materials.

22. Squeezing water before dyeing, namely putting the refined and squeezed tencel cheese into a special dye vat for the non-aqueous medium regenerated cellulose fiber cheese, wherein the pressurizing pressure is 0.3MPa during squeezing water, and the water content of the tencel cheese after squeezing water is 180 percent (owf.). In the present embodiment, the dye vat dedicated for the non-aqueous medium regenerated cellulose fiber cheese may be simply referred to as a dye vat unless otherwise specified.

23. Adding a non-aqueous medium, and putting the non-aqueous medium into a dye vat, wherein the mass ratio of the tencel cheese to the non-aqueous medium is 1:4.

24. Adding dye liquor, adding the dye liquor into a material vat of a dye vat through an automatic feeding system, adding a non-aqueous medium, stirring, and injecting the dye liquor into the dye vat in a side linear feeding manner (namely the dye liquor mixed with the non-aqueous medium). The dye bath temperature when the dye liquor is added into the dye vat is 31 ℃, the heat preservation time is 20min at 34 ℃ after the dye liquor is added, and the ratio of the tencel cheese to the non-aqueous medium is 1: 4.5.

25. Adding alkali, namely adding an alkali solution into a material vat of the dye vat through an automatic feeding system, adding a non-aqueous medium, stirring, and adding a linear material (namely the alkali solution mixed with the non-aqueous medium) into the dye vat. The dye bath temperature when the alkali liquor is added into the dye vat is 36 ℃, the heat preservation time is 30min at 40 ℃ after the alkali is added, and the ratio of the regenerated cellulose fiber cheese to the non-aqueous medium is 1: 5.

26. Heating, wherein the heating rate is controlled at 1 ℃/min.

27. And (4) preserving heat, wherein the heat preservation temperature is 60 ℃ after the temperature is raised, and the heat preservation time is 50 min.

28. Washing, wherein the washing temperature is 60 ℃, the single washing time is 10min, the washing times are 2 times, and the water consumption for each washing is 4 times (owf.). The total wash water usage for 2 washes was 8 times (owf.).

29. And (5) drying.

30. The dye uptake is 99%, the fixation rate is 95%, and the level-dyeing property is 4-5 grades.

31. The indexes of the finished tencel cheese are shown in table 2.

And testing the main fastness of the finished natural silk cheese according to the national standard GB/T3921-2008 and the national standard GB/T3920-2008. The test results are shown in table 2.

TABLE 2

In addition, the level-dyeing property of the finished tencel cheese can meet the customer requirements through detection, and no difference between an inner layer and an outer layer exists; the yarn strength of the finished tencel cheese can meet the requirements of customers; the flexibility of the yarn can meet the weaving requirement; the cloth cover effect and the hand feeling effect of the woven yarn can meet the requirements of customers.

Example 3, bamboo fiber cheese with red color.

Bamboo fiber cheese to be dyed: 40 bamboo fiber cheese.

The quality of the bamboo fiber cheese to be dyed is as follows: 288 kg.

The dye solution formula comprises:

reactive red L-S: 0.5% (owf.);

the method comprises the following steps of (1) using water for dyeing: 10% (owf.).

Alkali liquor formula:

soda ash: 5% (owf.);

water for alkali dissolution: 30% (owf.).

Dyeing process and parameters

31 weighing and melting the materials.

32, putting the refined bamboo fiber cheese with the squeezed water into a special dye vat for the non-aqueous medium regenerated cellulose fiber cheese, wherein the pressurizing pressure is 0.4MPa when the water is squeezed, and the water content of the bamboo fiber cheese after the water is squeezed is 130% (owf.). In the present embodiment, the dye vat dedicated for the non-aqueous medium regenerated cellulose fiber cheese may be simply referred to as a dye vat unless otherwise specified.

33. Adding a non-aqueous medium, and putting the non-aqueous medium into a dye vat, wherein the ratio of the bamboo fiber cheese to the non-aqueous medium is 1:4.

34. Adding a dye solution, adding the dye solution into a material vat of the dye vat through an automatic feeding system, adding a non-aqueous medium, stirring, and injecting the material into the dye vat in a side linear feeding manner (namely the dye solution mixed with the non-aqueous medium). The dye bath temperature when the dye liquor is added into the dye vat is 25 ℃, the heat preservation time is 20min at 27 ℃ after the dye liquor is added, and the ratio of the bamboo fiber cheese to the non-aqueous medium is 1: 4.3.

35. Adding alkali, namely adding an alkali solution into a material vat of the dye vat through an automatic feeding system, adding a non-aqueous medium, stirring, and adding a linear material (namely the alkali solution mixed with the non-aqueous medium) into the dye vat. The dye bath temperature when the alkali liquor is added into the dye vat is 34 ℃, the heat preservation time is 20min at 36 ℃ after the alkali is added, and the ratio of the bamboo fiber cheese to the nonaqueous medium is 1: 4.6.

36. Heating, wherein the heating rate is controlled at 1 ℃/min.

37. And (4) preserving heat, wherein the heat preservation temperature is 60 ℃ after the temperature is raised, and the heat preservation time is 20 min.

38. Washing, wherein the washing temperature is 30 ℃, the single washing time is 10min, the washing times are 2 times, and the water consumption for each washing is 4 times (owf.). The total wash water usage for 2 washes was 8 times (owf.).

39. And (5) drying.

40. The dye uptake is 99%, the fixation rate is 97%, and the level-dyeing property is 4-5 grades.

41. The indexes of the finished bamboo fiber cheese are shown in table 3.

And testing the main fastness of the finished bamboo fiber cheese according to the national standard GB/T3921-2008 and the national standard GB/T3920-2008. The test results are shown in table 3.

TABLE 3

Fastness to soaping	Fastness to dry rubbing	Fastness to wet rubbing
			4-5 stages	4-5 stages	4-5 stages

In addition, through detection, the level-dyeing property of the finished bamboo fiber cheese can meet the customer requirements, and no difference between an inner layer and an outer layer exists; the yarn strength of the finished bamboo fiber cheese can meet the requirements of customers; the flexibility of the yarn can meet the weaving requirement; the cloth cover effect and the hand feeling effect of the woven yarn can meet the requirements of customers.

In the dyeing bath of the regenerated cellulose fiber cheese adopted in the method for dyeing the regenerated cellulose fiber cheese by using the reactive dye, most of liquid is a non-aqueous medium, the using amount of water is very small, the dye is only dissolved in water but not dissolved in the non-aqueous medium, most of water is adsorbed on the regenerated cellulose fiber cheese, and therefore most of dye is adsorbed on the regenerated cellulose fiber cheese, and the dye uptake can be close to 100%. In addition, because alkali is only dissolved in water but not in a non-aqueous medium, the reactive dye dyed on the regenerated cellulose fiber cheese has proper alkaline conditions, the fixation rate is improved, and the average fixation rate can reach more than 93 percent. Compared with the traditional water bath dyeing, the effect saves more than 20% of reactive dye, does not need to add salt, reduces the material cost of dyeing, simultaneously reduces the proportion of the flooding dye needing to be washed from about 30% to less than 7% and to 1/3 of the traditional water bath dyeing, thereby reducing the washing times and reducing the washing water quantity from about 60 times (owf.) of the traditional water bath dyeing to 16 times (owf.). In addition, the single-cylinder level-dyeing grade of the regenerated cellulose fiber cheese reactive dye dyeing method provided by the embodiment of the application can reach 4-5 grades, is obviously superior to 3-4 grades of a non-aqueous medium dyeing method in CN107794788A, has small cylinder difference, and is easier to popularize and industrialize. Because no salt is added in the dyeing process, the salt content and the dye content in the dyeing wastewater are both very low, and the subsequent water treatment is simple.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The colored regenerated cellulose fiber cheese is characterized in that the regenerated cellulose fiber cheese is dyed by reactive dyes, the soaping fastness of the dyed regenerated cellulose fiber cheese under the national standard GB/T3921-2008 is 4-5, the dry rubbing fastness under the national standard GB/T3920-2008 is 4-5, the wet rubbing fastness is 3-4, and the color depth under the national standard GB/T4841.7-2006 can reach 2/1 standard depth.

2. The regenerated cellulose fiber cheese according to claim 1, wherein the regenerated cellulose fiber cheese is any one of viscose cheese, natural silk cheese, modal cheese, bamboo fiber cheese, chitin fiber cheese, and cuprammonium fiber cheese.

3. The regenerated cellulose fiber cheese according to claim 1 or 2, characterized in that the fixing rate of the reactive dye is not less than 80%, the dyeing rate is not less than 99%, and the level-dyeing property is grade 4-5; the reactive dye is any one or the combination of at least two of reactive black G, reactive navy blue L-3G and reactive red L-S.

4. A method for dyeing regenerated cellulose fiber cheese reactive dye based on a non-aqueous medium is characterized by comprising the following steps:

(2) adding a dyeing solution: according to the mass ratio of the non-aqueous medium to the regenerated cellulose fiber cheese of (1.5: 1) - (30:

1) adding a non-aqueous medium to the dye vat; then, adding a first mixed solution of a non-aqueous medium and a dye solution into the dye vat; wherein when the first mixed solution is added into the dye vat, the materials are added according to a first linear feeding mode of slow feeding and fast feeding, and the dye bath temperature is 5-40 ℃; wherein, after the first mixed solution is added, the temperature of the dye bath is controlled to be 5-40 ℃ for 10-60 min; after the first mixed solution is added, the mass ratio of the non-aqueous medium to the regenerated cellulose fiber cheese in the dye vat is (2: 1) - (30.5: 1); wherein the dye liquor consists of 0.1-30% (owf.) of reactive dye and 10-250% (owf.) of water;

(6) and (6) drying.

5. The method according to claim 4, wherein the first linear feeding mode is in particular: the initial feeding speed is 0-10L/min, the final feeding speed is 5-100L/min, the feeding time is 1-100min, and the feeding speed is increased along with the change of time.

6. The method of claim 4 wherein the second mixture is added to the dye vat in a second linear feed of slow first and then fast; the second linear feeding mode specifically comprises the following steps: the initial feeding speed is 0-10L/min, the final feeding speed is 5-100L/min, the feeding time is 1-100min, and the feeding speed is increased along with the change of time.

7. A method according to any one of claims 4 to 6, wherein the non-aqueous medium is a liquid and has a surface tension of 1 to 60mN/m at 20 ℃.

8. The method of claim 7, wherein the non-aqueous medium is any one of a hydrocarbon, a silicon-based hydrocarbon, a cyclic methyl siloxane, a liquid paraffin, or a combination of at least two thereof.

9. The method according to any one of claims 4 to 6, wherein the reactive dye is any one of or a combination of at least two of reactive black G, reactive navy blue L-3G and reactive red L-S, and the alkali in the alkali liquor is one of or a combination of at least two of sodium phosphate, sodium silicate, sodium carbonate, sodium hydroxide, sodium monohydrogen phosphate, sodium dihydrogen phosphate and sodium bicarbonate; the reactive dye has the color fixing rate of not less than 80 percent, the dye uptake of not less than 99 percent and the level-dyeing property of 4-5 grades.

10. A regenerated cellulose fiber cheese dyed according to the method of any one of claims 4 to 9.