CN112391856B - A kind of overdyeing method of nylon fiber and protein powder - Google Patents

Abstract

The invention provides a method for pad dyeing of nylon fiber and protein powder. Firstly, sequentially adding vat dye, sodium hydroxide, thiourea dioxide, glacial acetic acid and a carrier according to a preset concentration to prepare vat dye liquor; then adding the mixture of the nylon fiber and the protein powder into a dye solution for a chromatography dyeing process to finish the respective dye-uptake of the nylon fiber and the protein powder; and finally, putting the dyed protein powder and the nylon fiber in circulating water for washing, cleaning, bleaching and separating to obtain the dyed nylon fiber and the dyed protein powder respectively. The over-dyeing method can remarkably improve the dyeing efficiency of the nylon fiber which is difficult to dye, effectively improves the dyeing phenomenon of the nylon fiber by utilizing the excellent adsorption performance and gradual release action of the protein powder to the vat dye while over-dyeing the protein powder, and the dyed nylon fiber and the protein powder have excellent light fastness.

Description

A kind of overdyeing method of nylon fiber and protein powder

technical field

The invention relates to the technical field of textile printing and dyeing, in particular to an overdyeing method of nylon fiber and protein powder.

Background technique

Nylon fiber has the advantages of high breaking strength, good fatigue resistance and good wear resistance. It is the second largest synthetic fiber in output after polyester, and is widely used in textile and clothing, automobile industry and other fields. Nylon dyeing is easy to dye flowers due to the molecular structure of the fiber, resulting in a high rate of defective products.

Vat dyes have excellent properties such as bright color, complete chromatogram and good color fastness. Among them, the color fastness to sunlight and color fastness to washing are particularly outstanding. They are often used in the dyeing of protein fibers and polyester-cotton blended fabrics. Overdyeing of components. Among them, the vat dye leuco dyeing method is to change the vat dye into the sodium salt of the leuco body through pre-reduction, which is adsorbed by the fiber in the dye bath, and then oxidized to form a water-insoluble dye lake fixed on the fiber, which can Give full play to the advantages of vat dyes. However, the leucosome dyeing method in the prior art has the defects of fast initial dyeing of fibers and easy dyeing of flowers. At the same time, for some high-performance nylon fibers with high crystallinity, strong hydrophobicity or poor alkali resistance, it is difficult to obtain fibers with good dyeing performance by using conventional vat dyeing methods, which greatly limits the use of vat dyes in high-performance nylon. fiber applications.

The invention patent with the application number CN201910246452.0 discloses a composite reducing agent and a reduction dyeing method. The composite reducing agent includes 30-75wt% of thiourea dioxide, 60-20wt% of reducing sugar, and chemical potential control agent: at least one of sodium nitrite, acrylamide, furfural, cyclohexanone and trichloroacetic acid 10-5wt%. The composite reducing agent and the vat dye are configured into a microcolloidal leuco sodium salt to form a stable reducing system, which can realize the pretreatment of the fabric, remove the grease and stains on the fiber surface, and complete the gradual penetration and adsorption of the dye. , to realize the process of combining pretreatment and dyeing into one.

In the document "Vat dyeing of bio-based nylon 56 fabrics" published in the publication "Printing and Dyeing" in 2019, it was disclosed that the bio-based nylon 56 fabric was dyed by the vat dye leucobody dyeing method. The research found that the optimized process is: The dye mass fraction is 4% (omf), the hydrosulfite mass concentration is 10g/L, the dyeing time is 40min, the sodium hydroxide mass concentration is 12g/L, and the dyeing temperature is 80℃; the dyed bio-based nylon 56 fabric has good abrasion resistance, Color fastness to perspiration and soaping.

However, most of the above dyeing methods use chemical reagents to solve the problem. Therefore, in order to solve the problem of easy dyeing of difficult-to-dye high-performance nylon fibers during the dyeing process, it is necessary to provide a nylon fiber dyeing method that has high dyeing efficiency and can improve the phenomenon of fiber dyeing.

SUMMARY OF THE INVENTION

In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an overdyeing method of nylon fiber and protein powder.

In order to achieve the above purpose of the invention, the present invention provides an overdyeing method of nylon fiber and protein powder, comprising the following steps:

S1, preparation of dye liquor: add vat dye to water according to a predetermined ratio and stir, then add sodium hydroxide and thiourea dioxide in sequence to obtain a leucobody solution; heat the leucobody solution to 40-90°C, After stirring at a rotational speed of 150-250r/min for 5-15min, adjust the pH value to 5-6 to obtain a leuco acid solution; finally, add a carrier to the leuco acid solution, and stir to prepare a vat dye solution;

S2, over-dyeing: first put a predetermined proportion of protein powder into the vat dye solution prepared in step S1 with a bath ratio of 1:(25-40), heat up to 35°C-45°C and stir for 10-20min, then Putting a predetermined proportion of nylon fibers, and performing a dyeing process on the nylon fibers and the protein powder; after the dyeing is completed, complete the dyeing of the nylon fibers and the protein powder respectively;

S3, post-processing: take out the dyed protein powder and nylon fiber, rinse them in circulating water, wash the floating color, separate the protein powder and nylon fiber, filter the circulating water after separation, and obtain the dyed nylon fiber and nylon fiber respectively. The dyed protein powder.

Preferably, in the vat dye solution of step S1, the concentration of the vat dye is 4-10 g/L, the concentration of the sodium hydroxide is 4-10 g/L, and the concentration of the thiourea dioxide is 4-10 g/L. 10g/L, the concentration of the carrier is 30-70g/L.

Preferably, the carrier includes, but is not limited to, one or more of methylformanilide, ethylene glycol phenyl ether, and N-N-dimethylacetamide.

Preferably, in the mixture in step S2, the mass ratio of the nylon fiber and the protein powder is 1:0.5-1:1.5.

Preferably, the particle size of the protein powder is 1 μm-5 μm.

Preferably, the nylon fibers include, but are not limited to, one or more of nylon 6 fibers, nylon 66 fibers, and nylon 56 fibers.

Preferably, the protein powder includes, but is not limited to, one or more of wool powder, silk powder, and down powder.

Preferably, in the dyeing process of step S2, the initial temperature of dyeing is set to 30-50°C, the temperature is raised to 80-110°C at a heating rate of 1-2°C/min, and the temperature is maintained for 40-80min; and then the temperature is 2-4°C. The cooling rate of ℃/min is lowered to below 50 ℃.

Preferably, the vat dyes are one or more of insoluble vat dyes.

Preferably, in step S1, glacial acetic acid is used to adjust the pH value of the leuco acid solution.

Compared with the prior art, the beneficial effects of the present invention are:

1. The over-dying method of nylon fiber and protein powder provided by the present invention is to mix two mutually independent materials to be dyed, nylon fiber and protein powder, and put them into a vat dye leuco acid dye solution to carry out the over-dyeing process, that is, a process. Two kinds of vat dyes were dyed in the same system, nylon fiber and protein powder, respectively. The invention utilizes the small size effect of high surface activity, high specific surface area, etc. and the excellent performance of surface and interface effect of the micro-nano-sized ultrafine protein powder, so that it exhibits excellent adsorption performance for the vat dye leuco acid. Therefore, the protein powder can adsorb a large amount of the vat leuco acid in the vat leuco acid dyeing solution, so that the concentration of the dye solution is greatly reduced, and the protein powder buffer system of the vat dye is formed. A large amount of adsorption is carried out, and then the slow release is carried out, which is conducive to the slow and uniform dyeing process of nylon fibers, and effectively avoids the phenomenon that the concentration of vat dyes is too high in the dyeing process, and the concentration changes too quickly, causing uneven dyeing and dyeing of nylon fibers. , and significantly improved its dyeing efficiency. The mechanism is:

1) In the preparation process of the vat dye liquor, after mixing the vat dye with water, add sodium hydroxide and thiourea dioxide and stir evenly, after heating treatment, the thiourea dioxide generates urea and sulfinic acid under heating and an alkaline environment, The sulfinic acid reduces the vat dye to a leuco sodium salt to obtain a vat leuco solution; then adjust the vat leuco solution to an acidic environment, and add a carrier to it to prepare a vat leuco acid dye solution, It is helpful for the adsorption and dyeing of protein powder in the subsequent process, and is conducive to the formation of the protein powder buffer system of vat dye;

2) In the over-dyeing process, protein powder is first added to the dye solution, preheated at a low temperature and then stirred. On the one hand, the urea generated by the reaction of thiourea dioxide will swell the protein powder, and the vat dyes will be adsorbed on the micro-nano size protein powder in large quantities. On the other hand, as the temperature increases, due to the adsorption and easy dyeing properties of the protein powder, the vat dyes gradually enter the interior of the protein powder, and most of the vat dyes in the dye solution enter the And adsorbed on the protein powder, so that the concentration of the dye solution is greatly reduced. At this time, nylon fiber is added, and the remaining vat dye in the dye solution is slowly adsorbed on the surface of the nylon fiber;

3) During high-temperature dyeing, the excess carrier in the dye solution swells the nylon fiber under the action of heat, which increases the gap between the macromolecular chains of the nylon fiber. At this time, because the inner channel of the nylon fiber is opened, and the attraction of the carrier to the vat dye is stronger than that of water, the vat dye in the dye liquor enters the interior of the nylon fiber under the guidance of the carrier. Further, the concentration of vat dyes in the dye liquor decreases. Due to the difference in concentration, vat dyes adsorbed on the surface of the protein powder gradually diffuse into the dye liquor. At the same time, the urea generated by the reaction in the dye liquor will also swell the nylon fibers. The synergistic effect with urea makes it easier for vat dyes to be guided into nylon fibers, and the buffer system of dye solution concentration formed by the adsorption and gradual release of protein powder overcomes the faster initial dyeing of nylon fibers in the dyeing process, The defect of easy dyeing of flowers prevents the vat dye from quickly adsorbing and entering the interior of the nylon fiber, which plays a role in retarding dyeing. While overdyeing the protein powder, it effectively improves the uneven dyeing of the nylon fiber and the phenomenon of dyeing flowers.

2. The over-dyeing method of nylon fiber and protein powder provided by the present invention, the ultrafine protein powder adopted is made from wool short fiber, silk and down products, etc. One of the sources of wool short fiber, silk and down products is Discarding recycled materials reduces the waste of natural resources and meets the requirements of sustainable development.

Detailed ways

The technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The invention provides an overdyeing method of nylon fiber and protein powder, comprising the following steps:

S1, preparation of dye liquor: add vat dye to water according to a predetermined ratio and stir, then add sodium hydroxide and thiourea dioxide in sequence to obtain a leucobody solution; heat the leucobody solution to 40-90°C, After stirring at a rotational speed of 150-250r/min for 5-15min, adjust the pH value to 5-6 to obtain a leuco acid solution; finally, add a carrier to the leuco acid solution, and stir to prepare a vat dye solution;

S2, over-dyeing: first put a predetermined proportion of protein powder into the vat dye solution prepared in step S1 with a bath ratio of 1:(25-40), heat up to 35°C-45°C and stir for 10-20min, then Putting a predetermined proportion of nylon fibers, and performing a dyeing process on the nylon fibers and the protein powder; after the dyeing is completed, complete the dyeing of the nylon fibers and the protein powder respectively;

S3, post-processing: take out the dyed protein powder and nylon fiber, rinse them in circulating water, wash the floating color, separate the protein powder and nylon fiber, filter the circulating water after separation, and obtain the dyed nylon fiber and nylon fiber respectively. The dyed protein powder.

Preferably, in the vat dye solution of step S1, the concentration of the vat dye is 4-10 g/L, the concentration of the sodium hydroxide is 4-10 g/L, and the concentration of the thiourea dioxide is 4-10 g/L. 10g/L, the concentration of the carrier is 30-70g/L.

Preferably, the carrier includes, but is not limited to, one or more of methylformanilide, ethylene glycol phenyl ether, and N-N-dimethylacetamide.

Preferably, in the mixture in step S2, the mass ratio of the nylon fiber and the protein powder is 1:0.5-1:1.5.

Preferably, the particle size of the protein powder is 1 μm-5 μm.

Preferably, the nylon fibers include, but are not limited to, one or more of nylon 6 fibers, nylon 66 fibers, and nylon 56 fibers.

Preferably, the protein powder includes, but is not limited to, one or more of wool powder, silk powder, and down powder.

Preferably, in the dyeing process of step S2, the initial temperature of dyeing is set to 30-50°C, the temperature is raised to 80-110°C at a heating rate of 1-2°C/min, and the temperature is maintained for 40-80min; and then the temperature is 2-4°C. The cooling rate of ℃/min is lowered to below 50 ℃.

Preferably, the vat dyes are one or more of insoluble vat dyes.

Preferably, in step S1, glacial acetic acid is used to adjust the pH value of the leuco acid solution.

The present invention will be further described in detail below through specific embodiments.

In the present invention, the colori7 colorimeter is used to test the K/S value; the light fastness is tested according to the standard GB/T 8427-2008 "Color fastness of textiles to artificial light: Xenon arc".

Example 1

The present embodiment provides an overdyeing method of high-strength nylon 66 fiber and wool powder:

S1, dye liquor preparation: add insoluble vat blue BC to distilled water at a predetermined ratio, and stir to process, and then add sodium hydroxide and thiourea dioxide in turn to obtain a leucobody solution; the leucobody solution is heated to 90 ℃, after stirring for 15min at a rotating speed of 250r/min, adding glacial acetic acid to adjust the pH value to 5-6 to obtain a leuco acid solution; finally adding a carrier ethylene glycol phenyl ether to the leuco acid solution, stirring to prepare The vat dye solution is obtained; in the vat dye solution, the concentration of the vat blue BC is 10 g/L, the concentration of the sodium hydroxide is 10 g/L, and the concentration of the thiourea dioxide is 10 g/L, so the The concentration of described ethylene glycol phenyl ether is 70g/L;

S2, over-dyeing: first put a predetermined proportion of wool powder into the vat dye solution prepared in step S1 with a bath ratio of 1:40, heat up to 45° C. and stir for 20 minutes, and then put a predetermined proportion of high-strength nylon 66 fibers in , the dyeing process of the high-strength nylon 66 fiber and wool powder is carried out, the initial temperature of dyeing is 30 ° C, the temperature is raised to 110 ° C at a heating rate of 2 ° C/min, and the temperature is kept for 80 min; then the temperature is lowered at a cooling rate of 4 ° C/min. to below 50 °C; after the dyeing is completed, the dyeing of the high-strength nylon 66 fiber and the wool powder is completed; wherein, the mass ratio of the high-strength nylon 66 fiber and the wool powder is 1:1.5, and the particle size of the wool powder is 1μm;

S3, post-processing: take out the vat dyed high-strength nylon 66 fibers prepared in step S2 and the vat dyed wool powder, rinse them in circulating water, wash the floating color, and separate the wool powder and the wool powder. The high-strength nylon 66 fiber is separated and the circulating water is filtered to obtain the dyed high-strength nylon 66 fiber and the dyed wool powder respectively.

Example 2

The present embodiment provides an overdyeing method of high-strength nylon 66 fiber and wool powder:

S1, dye liquor preparation: add insoluble vat blue BC to distilled water according to a predetermined ratio, and stir, then add sodium hydroxide and thiourea dioxide in turn to obtain a leucobody solution; the leucobody solution is heated to 40 ℃, after stirring for 5 minutes at a rotating speed of 150r/min, adding glacial acetic acid to adjust the pH value to 5-6 to obtain a leuco acid solution; finally adding a carrier ethylene glycol phenyl ether to the leuco acid solution, stirring to prepare The vat dye solution is obtained; in the vat dye solution, the concentration of the vat blue BC is 4g/L, the concentration of the sodium hydroxide is 4g/L, and the concentration of the thiourea dioxide is 4g/L, so The concentration of described ethylene glycol phenyl ether is 30g/L;

S2, over-dyeing: first put a predetermined proportion of wool powder into the vat dye solution prepared in step S1 with a bath ratio of 1:25, heat up to 35°C and stir for 10 minutes, and then put in a predetermined proportion of high-strength nylon 66 fibers , the dyeing process of the high-strength nylon 66 fiber and wool powder is carried out. The initial temperature of dyeing is 30 ° C, the temperature is raised to 110 ° C at a heating rate of 1 ° C/min, and the temperature is kept for 40 minutes; then the temperature is lowered to 2 ° C/min. Below 50 ° C; after the dyeing is completed, the dyeing of the high-strength nylon 66 fiber and the wool powder is completed; wherein, the mass ratio of the high-strength nylon 66 fiber and the wool powder is 1:0.5, and the particle size of the wool powder is 5 μm ;

S3, post-processing: take out the vat dyed high-strength nylon 66 fibers prepared in step S2 and the vat dyed wool powder, rinse them in circulating water, wash the floating color, and separate the wool powder and the wool powder. The high-strength nylon 66 fiber is separated and the circulating water is filtered to obtain the dyed high-strength nylon 66 fiber and the dyed wool powder respectively.

Example 3

The present embodiment provides an overdyeing method of high-strength nylon 66 fiber and wool powder:

S1, dye liquor preparation: add insoluble vat blue BC to distilled water at a predetermined ratio, and stir to process, then add sodium hydroxide and thiourea dioxide in sequence to obtain a leucobody solution; the leucobody solution is heated to 60 ℃, after stirring at 200r/min for 10min, adding glacial acetic acid to adjust the pH value to 5-6 to obtain a leuco acid solution; finally adding a carrier ethylene glycol phenyl ether to the leuco acid solution, stirring to prepare The vat dye solution is obtained; in the vat dye solution, the concentration of the vat blue BC is 6g/L, the concentration of the sodium hydroxide is 6g/L, and the concentration of the thiourea dioxide is 6g/L, so the The concentration of described ethylene glycol phenyl ether is 40g/L;

S2, over-dyeing: first put a predetermined proportion of wool powder into the vat dye solution prepared in step S1 with a bath ratio of 1:30, heat up to 40°C and stir for 15 minutes, and then put in a predetermined proportion of high-strength nylon 66 fibers , the dyeing process of the high-strength nylon 66 fiber and wool powder is carried out. The initial temperature of dyeing is 35 ° C, the temperature is raised to 110 ° C at a heating rate of 1.5 ° C/min, and the temperature is kept for 60 minutes; Below 50 ° C; after the dyeing is completed, the dyeing of the high-strength nylon 66 fiber and the wool powder is completed; wherein, the mass ratio of the high-strength nylon 66 fiber and the wool powder is 1:1, and the particle size of the wool powder is 3 μm ;

S3, post-processing: take out the vat dyed high-strength nylon 66 fibers prepared in step S2 and the vat dyed wool powder, rinse them in circulating water, wash the floating color, and separate the wool powder and the wool powder. The high-strength nylon 66 fiber is separated and the circulating water is filtered to obtain the dyed high-strength nylon 66 fiber and the dyed wool powder respectively.

Example 4

The present embodiment provides an overdyeing method of high-strength nylon 66 fiber and wool powder:

S1, preparation of dye liquor: add insoluble vat blue BC and insoluble vat yellow 3RT to distilled water according to a predetermined ratio, and stir to process, then add sodium hydroxide and thiourea dioxide in turn to obtain a leuco solution; The body solution was heated to 60°C, stirred at a speed of 200 r/min for 10 min, and glacial acetic acid was added to adjust the pH to 5-6 to obtain a leuco acid solution; finally, a carrier ethylene glycol benzene was added to the leuco acid solution. ether, stirring treatment to prepare a vat dye solution; in the vat dye solution, the concentration of the vat blue BC is 3g/L, the concentration of vat yellow 3RT is 3g/L, and the concentration of the sodium hydroxide is 6g /L, the concentration of the thiourea dioxide is 6g/L, and the concentration of the ethylene glycol phenyl ether is 45g/L;

S2, over-dyeing: first put a predetermined proportion of wool powder into the vat dye solution prepared in step S1 with a bath ratio of 1:30, heat up to 40°C and stir for 15 minutes, and then put in a predetermined proportion of high-strength nylon 66 fibers , the dyeing process of the high-strength nylon 66 fiber and wool powder is carried out. The initial temperature of dyeing is 35 ° C, the temperature is raised to 110 ° C at a heating rate of 1 ° C/min, and the temperature is kept for 60 minutes; below 50°C; after the dyeing is completed, the dyeing of the nylon 56 fiber and the wool powder is completed respectively; wherein, the mass ratio of the high-strength nylon 66 fiber and the wool powder is 1:1, and the particle size of the wool powder is 3 μm;

S3, post-processing: take out the vat dyed high-strength nylon 66 fibers prepared in step S2 and the vat dyed wool powder, rinse them in circulating water, wash the floating color, and separate the wool powder and the wool powder. The high-strength nylon 66 fiber is separated and the circulating water is filtered to obtain the dyed high-strength nylon 66 fiber and the dyed wool powder respectively.

Comparative Example 1

The difference with embodiment 3 is: adopt traditional vat dye leuco acid dyeing method to dye high-strength nylon 66 fiber, comprising the following steps:

S1, add insoluble vat blue BC with a concentration of 6g/L into distilled water, stir and process, add sodium hydroxide with a concentration of 6g/L and thiourea dioxide with a concentration of 6g/L, heat up to 60 °C and stir at 200 r/min After 10 minutes, add glacial acetic acid to adjust the pH to 5-6 to prepare vat dye liquor;

S2, put the high-strength nylon 66 fiber into the vat dye solution at a liquor ratio of 1:30, the dyeing initial temperature is 35 °C, and the temperature is raised to 110 °C at a heating rate of 1 °C/min, and the temperature is maintained for 60min; The cooling rate of 3°C/min is cooled to below 50°C, and the dyed high-strength nylon 66 fiber is taken out;

S3, the prepared high-strength nylon 66 fibers dyed with vat dyes are washed with running water and dried to obtain dyed high-strength nylon 66 fibers.

Table 1 shows the performance parameters of Examples 1 to 4 and Comparative Example 1

Analysis of Examples 1-4 and Comparative Example 1 in combination with Table 1: The high-strength nylon 66 fibers of Examples 1-4 prepared by the dyeing method provided by the present invention have excellent K/S value, which is much higher than that of Comparative Example The K/S value of the fiber obtained after dyeing according to the traditional vat dye leuco acid dyeing method.

In addition, the light fastness of the high-strength nylon 66 fibers prepared in Examples 1-4 is greater than that of the fibers dyed with traditional vat dye leuco acid. Thus, it is shown that compared with the traditional vat dye leuco acid dyeing method, the dyeing method provided by the present invention can effectively improve the dyeing efficiency of nylon fibers, and has excellent light fastness.

Example 5

The present embodiment provides a kind of overdyeing method of nylon 6 fiber and silk powder:

S1, dye liquor preparation: add insoluble vat dye vat blue BC to distilled water in a predetermined proportion, and stir to process, then add sodium hydroxide and thiourea dioxide in turn to obtain a leucobody solution; heat the leucobody solution to 40°C, stirring at 200r/min for 15min, adding glacial acetic acid to adjust the pH to 5-6 to obtain a leuco acid solution; finally, adding a carrier methylformanilide to the leuco acid solution, stirring The vat dye solution is prepared by treatment; in the vat dye solution, the concentration of the vat blue BC is 8g/L, the concentration of the sodium hydroxide is 8g/L, and the concentration of the thiourea dioxide is 8g/L , the concentration of the methylformanilide is 60g/L;

S2, over-dyeing: first put a predetermined proportion of silk powder into the vat dye solution prepared in step S1 with a bath ratio of 1:30, heat up to 40°C and stir for 15min, then put in a predetermined proportion of nylon 6 fibers, The dyeing process of the nylon 6 fiber and silk powder is carried out. The initial temperature of dyeing is 40 ° C, the temperature is raised to 80 ° C at a heating rate of 1 ° C/min, and the temperature is kept for 60 min; then the temperature is lowered to 50 ° C at a cooling rate of 3 ° C/min. Below; After the dyeing finishes, finish the dyeing of described nylon 56 fiber and silk powder respectively; Wherein, the mass ratio of nylon 56 fiber and silk powder is 1:1, and the particle diameter of silk powder is 3 μm;

S3, post-processing: take out the vat dyed nylon 6 fibers prepared in step S2 and the vat dyed silk powder, rinse them in circulating water, wash the floating color, and separate the silk powder and nylon 6 fibers, and after separation, the circulating water is filtered to obtain dyed nylon 6 fibers and dyed silk powder, respectively.

The K/S value of the nylon 6 fiber after dyeing provided in Example 5 is 8.34, the K/S value of the silk powder is 3.15, the light fastness of the nylon 6 fiber is grade 4, and the dyed fabric is colorless. .

Example 6

The present embodiment provides an overdyeing method of nylon 56 fiber and down powder:

S1, dye liquor preparation: add insoluble vat dye vat blue BC to distilled water in a predetermined proportion, and stir to process, then add sodium hydroxide and thiourea dioxide in turn to obtain a leucobody solution; heat the leucobody solution to 45°C, stirring at a speed of 200r/min for 15min, adding glacial acetic acid to adjust the pH to 5-6 to obtain a leuco acid solution; finally adding the carrier N-N-dimethylacetamide to the leuco acid solution , the vat dye solution is prepared by stirring treatment; in the vat dye solution, the concentration of the vat blue BC is 8g/L, the concentration of the sodium hydroxide is 8g/L, and the concentration of the thiourea dioxide is 8g /L, the concentration of the N-N-dimethylacetamide is 60g/L;

S2, over-dyeing: first put a predetermined proportion of down powder into the vat dye solution prepared in step S1 with a bath ratio of 1:30, heat up to 40°C and stir for 15 minutes, and then put a predetermined proportion of nylon 56 fiber, The dyeing process of the nylon 56 fiber and the down powder is carried out. The following; after the dyeing is finished, the dyeing of the nylon 56 fiber and the down powder is completed respectively; wherein, the mass ratio of the nylon 56 fiber and the down powder is 1:1, and the particle size of the wool powder is 3 μm;

S3, post-processing: take out the vat dyed nylon 56 fibers and the vat dyed down powder prepared in step S2, rinse them in circulating water, wash the floating color, and separate the down powder and nylon 56 fibers, and after separation, the circulating water is filtered to obtain dyed nylon 56 fibers and dyed down powder, respectively.

The K/S value of the dyed nylon 56 fiber provided in Example 6 is 8.23, the K/S value of the down powder is 3.09, the light fastness of the nylon 56 fiber is grade 4, and the dyed fabric is colorless. .

It should be noted that those skilled in the art should understand that in the over-dyeing process provided by the present invention, the process parameter settings in the dyeing process can be adjusted according to the actual situation, all of which can achieve excellent dyeing effects.

To sum up, the present invention provides an overdyeing method of nylon fiber and protein powder. First, according to the predetermined concentration, add vat dye, sodium hydroxide, thiourea dioxide, glacial acetic acid and carrier in turn to prepare vat dye solution; then add the mixture of nylon fiber and protein powder into the dye solution to carry out the over-dyeing process to complete the dyeing process. The nylon fiber and protein powder are dyed separately; finally, the dyed nylon fiber and protein powder are rinsed in circulating water, the floating color is washed, the nylon fiber and protein powder are separated, and the circulating water is filtered after separation, and the dyeing is completed respectively. nylon fibers and dyed protein powder. The overdyeing method can significantly improve the dyeing efficiency of difficult-to-dye nylon fibers. While overdyeing protein powder, the excellent adsorption performance and gradual release effect of protein powder on vat dyes are used to effectively improve the dyeing phenomenon of nylon fibers. And the dyed nylon fiber and protein powder have excellent light fastness.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some or all of the technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.

Claims (8)

1. A process for the resist dyeing of nylon fiber and protein powder is characterized in that: the method comprises the following steps:

s1, dye liquor preparation: adding vat dye into water according to a preset proportion, stirring, and then sequentially adding sodium hydroxide and thiourea dioxide to obtain a leuco solution; heating the leuco solution to 40-90 ℃, stirring at the rotating speed of 150-250r/min for 5-15min, and adjusting the pH value to 5-6 to obtain a leuco acid solution; finally, adding a carrier into the leuco acid solution, and stirring to prepare a vat dye solution;

s2, counter dyeing: firstly, putting protein powder with a preset proportion into a bath with the bath ratio of 1: (25-40) heating the vat dye solution prepared in the step S1 to 35-45 ℃, stirring for 10-20min, then adding nylon fibers in a predetermined ratio, and dyeing the nylon fibers and the protein powder; after dyeing is finished, finishing the respective dyeing of the nylon fiber and the protein powder;

s3, post-processing: taking out the dyed protein powder and the nylon fiber, putting the dyed protein powder and the nylon fiber in circulating water for washing, washing the floating color, separating the protein powder from the nylon fiber, and filtering the circulating water after separation to respectively obtain the dyed nylon fiber and the dyed protein powder;

the carrier is one or more of methyl formanilide, ethylene glycol phenyl ether and N-N-dimethylacetamide;

the vat dye is one or more of insoluble vat dyes.

2. The counter dyeing method of nylon fiber and protein powder as claimed in claim 1, characterized in that: in the vat dye solution of step S1, the concentration of the vat dye is 4-10g/L, the concentration of the sodium hydroxide is 4-10g/L, the concentration of the thiourea dioxide is 4-10g/L, and the concentration of the carrier is 30-70 g/L.

3. The counter dyeing method of nylon fiber and protein powder as claimed in claim 1, characterized in that: in the step S2 mixture, the mass ratio of the nylon fiber to the protein powder is 1:0.5-1: 1.5.

4. The topping dyeing method of nylon fiber and protein powder according to claim 3, characterized in that: the particle size of the protein powder is 1-5 μm.

5. The topping dyeing method of nylon fiber and protein powder according to claim 3, characterized in that: the nylon fiber is one or more of nylon 6 fiber, nylon 66 fiber and nylon 56 fiber.

6. The topping dyeing method of nylon fiber and protein powder according to claim 4, characterized in that: the protein powder is one or more of wool powder, silk powder and down powder.

7. The counter dyeing method of nylon fiber and protein powder as claimed in claim 1, characterized in that: in the dyeing procedure of the step S2, the dyeing starting temperature is set to be 30-50 ℃, the temperature is increased to 80-110 ℃ at the heating rate of 1-2 ℃/min, and the temperature is kept for 40-80 min; then the temperature is reduced to below 50 ℃ at the cooling rate of 2-4 ℃/min.

8. The counter dyeing method of nylon fiber and protein powder as claimed in claim 1, characterized in that: in step S1, the pH of the leuco acid solution is adjusted with glacial acetic acid.