Splitting method for dope-dyed suede fabric

Abstract

The invention discloses a splitting method for dope-dyed suede fabric, belongs to the technical field of dyeing and finishing, and solves the problems that splitting of current disperse dye or organic pigment dope-dyed suede fabric needs to be carried out under a very strong alkaline condition, and due to a strong alkaline splitting condition, the suede fabric is seriously decolored and discolored, the fastness is reduced, and the subsequent use requirement of a product cannot be met. According to the invention, a series of four cationic surfactants are used as the chamois suede splitting accelerant, and the use amount of an alkaline agent during splitting of chamois suede dyed by a disperse dye or an organic pigment stock solution is reduced through the excellent promotion effect of the four cationic surfactants, so that the decoloration, discoloration and fastness of the chamois suede dyed by the disperse dye stock solution are within a controllable range. The method is suitable for splitting the chamois suede dyed by disperse dye or organic pigment stock solution.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dyeing and finishing, and particularly relates to a method for opening fibers of suede. BACKGROUND

[0002] Suede is a kind of artificial fabric imitating the natural suede texture and appearance, which is made of superfine fibers (such as polyester and nylon) through special processes (raising, buffing and dyeing). Suede has become a popular choice for clothing, home and car interior decoration due to its matte texture, lightness and breathability.

[0003] Conventional suede fabric needs to be dyed after opening fibers. Since the conventional suede fabric is woven from superfine fiber structure (single fiber fineness ≤0.1D), the huge specific surface area of the superfine fiber leads to a sharp increase in dye adsorption (30-50% higher than conventional fibers), but it is difficult for dye molecules to completely penetrate into the fiber interior, and a large amount of floating color remains on the surface. At the same time, the subsequent milling process will damage the fiber surface structure, making the un-fixed dye more likely to fall off, and the dye thermal migration phenomenon (migration rate up to 15-20%) during high-temperature setting further aggravates the fading risk, resulting in generally only 2-3 levels of dry / wet rubbing fastness (standard requires ≥4 levels), especially in dark colors (such as navy blue and black), the wet rubbing fastness is even lower than 2 levels.

[0004] To solve the problem of poor dyeing fastness of conventional suede fabric, many companies have developed suede fabric colored with disperse dyes or organic pigments. This technology adds disperse dyes or organic pigments during fiber spinning, and the fabric does not need to be dyed after weaving, effectively improving the dyeing fastness of the product. However, the fabric still needs to be opened after weaving, and high-concentration sodium hydroxide solution is needed during the opening process. High-concentration strong alkali is beneficial to the opening of suede fabric colored with disperse dyes or organic pigments, but it will also damage the structure of disperse dyes or organic pigments in suede, leading to color change due to structural change of disperse dyes or organic pigments, dye falling off and decrease of dyeing fastness.

[0005] The literature (Zhuang Xiaodong, Zhu Genxing, Shen Yawei, et al. Suede imidazole Gemini surfactant low alkali opening process [J]. Printing and dyeing, 2025, 51 (08): 24-27 + 40.) reported a kind of Gemini surfactant 2-bromo-1-(1-n-butyl-3-n-decyl imidazole)-1-n-decyl imidazole (referred to as 10-4-10) and 2-bromo-1-(1-n-butyl-3-n-hexyl imidazole)-3-n-hexyl imidazole (referred to as 6-4-6) as suede opening promoter, explored the influence of the amount of promoter and sodium hydroxide, opening temperature and time on the opening effect of suede, and compared with traditional promoter dodecyl dimethyl benzyl ammonium chloride (1227). The results showed that the opening promoting effect of 10-4-10 on suede fabric was better than that of 1227, and the opening promoting effect of 6-4-6 on suede was limited. The best process of 10-4-10 for low alkali opening of suede is: 2.5×10 -4 mol / L of 10-4-10, 10 g / L of NaOH, 100 ℃ of opening temperature and 40 min of opening holding time.

[0006] The literature (Zong Ping. Gemini surfactant on the promotion of polyester alkali reduction [J]. Dyeing and finishing technology, 2005, (07): 26-28 + 6.) reported that several different structures of cationic Gemini surfactants were used as the promoter of polyester alkali reduction treatment, and it was shown that Gemini surfactants 41253 and 31165 containing triquaternary ammonium salt and polyoxyethylene chain had lower adsorption on the surface of polyester due to the presence of polyoxyethylene chain in the molecule, and the alkali reduction promoting effect was not as good as that of double quaternary ammonium salt cationic surfactant 21302.

[0007] The patent document CN103343445B discloses a kind of promoter for polyester alkali reduction processing, the promoter is Gemini ionic liquid, the concentration of the promoter is 0.01-0.2 mmol / L. Imidazole Gemini ionic liquid with different hydrophobic carbon chain length and different connecting group length is used instead of traditional process cationic promoter for polyester fabric alkali reduction processing, only 0.01-0.2 mmol / L of imidazole Gemini ionic liquid is added to achieve the same reduction rate as the traditional process. Using imidazole Gemini ionic liquid with different hydrophobic carbon chain length and different connecting group length as the promoter for polyester alkali reduction processing, the shortcomings of high temperature condition of more than 100 ℃ and large amount of sodium hydroxide (the sodium hydroxide amount of this invention is 2-20 g / L) required for polyester fabric alkali reduction processing are solved, and the quality of the product is consistent with the conventional process.

[0008] Document (Cao J L, Meng C L, Cao Y, et al. Alkyl imidazole Gemini ionic liquid on polyester fabric alkali reduction treatment [J]. Journal of Textile Research, 2018, 39(01): 79-83.) uses three alkyl imidazole Gemini ionic liquid as polyester alkali reduction processing promoter, and compares with conventional cationic promoter dodecyl dimethyl benzyl ammonium chloride, explores the influence of promoter and sodium hydroxide dosage, alkali reduction treatment temperature and time and other factors on polyester reduction rate, tests the strength and morphology of polyester before and after alkali reduction treatment. The results show that the alkyl imidazole Gemini promoter can be used for the alkali reduction processing of polyester fiber, and the promoting effect of the promoter with the same structure on the polyester fiber conforms to the Traube rule; the stronger the hydrophobicity of the promoter, the higher the reduction rate of the polyester; the addition of the promoter can reduce the dosage of sodium hydroxide (sodium hydroxide dosage 5-10g / L), promote the alkali reduction of the polyester fiber, and the surface of the polyester after alkali reduction processing forms grooves, the fiber becomes thin, and the specific surface area increases. SUMMARY

[0009] In view of the defects that the concentration of sodium hydroxide is high in the traditional splitting treatment process of the dispersed dye or organic pigment stock solution colored suede fabric, the structure of the dispersed dye is damaged, and the suede fabric is seriously discolored and decolorized and the dyeing fastness is reduced, the alkyl surfactant containing four quaternary ammonium groups is used as a splitting promoter of the dispersed dye or organic pigment stock solution colored suede fabric instead of the traditional single-cation or double-cation surfactant, the alkali agent dosage for splitting of the dispersed dye or organic pigment stock solution colored suede fabric can be reduced, and the problems of serious discoloration and decolorization and reduced fastness of the suede caused by strong alkali splitting conditions can be avoided.

[0010] The splitting promoter and the splitting method for the dispersed dye or organic pigment stock solution colored suede fabric are quite different from the traditional promoters, the traditional promoters are single-cation surfactants or double-cation surfactants, the three quaternary ammonium salt promoters are used in the document (Zong P. Gemini surfactant promotes the alkali reduction of polyester [J]. Dyeing and finishing technology, 2005, (07): 26-28+6.), but the effect is not good, the promoter used in the application contains four quaternary ammonium groups, due to the strong adsorption capacity of the promoter to the fiber, the content of the quaternary ammonium group on the surface of the fiber is greatly increased, so that the content of OH - on the surface of the fiber is significantly increased, the splitting of the dispersed dye stock solution colored suede is carried out under low alkali conditions, the problems of discoloration, decolorization and reduced dyeing fastness caused by concentrated alkali are avoided, the promoter used in the application can be used on the traditional suede splitting equipment, and there is no special requirement for the equipment and process, and the splitting effect is consistent with the traditional process.

[0011] To solve the above technical problems, the technical scheme is adopted in the application as follows:

[0012] The application discloses a method for opening fibers of a stock solution colored suede fabric, wherein sodium hydroxide and a promoter are dissolved in water to prepare an opening solution, then a stock solution colored suede fabric with dispersed dyes or organic pigments is put into the opening solution, and then the temperature is raised to a specific temperature for heat preservation, after which the temperature is lowered, the solution is drained, washed with water and dried.

[0013] As a preferred technical scheme of the application, the concentration of the sodium hydroxide is 0.2-2 g / L, and the concentration of the promoter is 0.001-0.05 mmol / L.

[0014] As a preferred technical scheme of the application, the stock solution colored suede fabric with dispersed dyes or organic pigments is put into the opening solution, and the bath ratio is 1:(3-10).

[0015] As a preferred technical scheme of the application, the temperature is raised to 90-130 DEG C at a temperature raising speed of 0.5-2 DEG C / min, and the temperature is kept for 20-80 min, after which the temperature is lowered to below 80 DEG C.

[0016] As a preferred technical scheme of the application, the drying temperature is 60-100 DEG C, and the drying time is 3-20 min.

[0017] As a preferred technical scheme of the application, the long-chain alkyl surfactant with four cationic groups has the following structure:

[0018]

[0019] In the formula, m=6-16, n=0-5, and X=Cl or Br.

[0020] As a preferred technical scheme of the application, an overflow dyeing machine is used to open fibers of the stock solution colored suede fabric with dispersed dyes or organic pigments.

[0021] The application further provides a stock solution colored suede fabric prepared by the method.

[0022] The application has the following advantages over the prior art: the long-chain alkyl surfactant with four quaternary ammonium groups is used to replace the traditional single-cation or double-cation surfactant as the opening fiber promoter of the stock solution colored suede fabric with dispersed dyes or organic pigments, the content of the quaternary ammonium groups on the fiber surface is greatly increased by the strong adsorption of the opening fiber promoter to the fiber surface, and the content of OH - The opening fiber of the stock solution colored suede fabric with dispersed dyes or organic pigments is performed under low-alkali conditions, the defects of the stock solution colored suede fabric with dispersed dyes or organic pigments, such as serious discoloration and color change and reduced color fastness, caused by the high consumption of sodium hydroxide during the opening fiber process are solved, and the opening fiber effect is consistent with that of the traditional process.

[0023] The technical scheme of the present application has simple process and is convenient to operate, the developed developing agent has no special requirements for the original solution colored suede fabric and equipment, large-scale production can be carried out by using conventional equipment, and has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0025] Figure 1 Infrared spectrum of the opening-promoting agent prepared in Example 1.

[0026] Figure 2 SEM of the original dispersed dye original solution colored suede.

[0027] Figure 3 SEM of the sample of Example 1.

[0028] Figure 4 SEM of the sample of Comparative Sample 1. DETAILED DESCRIPTION

[0029] The present application will be further described in conjunction with specific examples. It should be understood that the following examples are only used to illustrate the present application and not used to limit the scope of the present application, and those skilled in the art can make some non-essential improvements and adjustments on the basis of the above-mentioned content of the present application.

[0030] The opening method of the original solution colored suede of the present application comprises the following steps:

[0031] The overflow dyeing machine is used for opening processing of the dispersed dye or organic pigment original solution colored suede, and the opening processing process is as follows: sodium hydroxide and a promoting agent are dissolved in water to prepare an opening solution, the concentration of the sodium hydroxide is 0.2-2 g / L, and the concentration of the promoting agent is 0.001-0.05 mmol / L; then the dispersed dye or organic pigment original solution colored suede fabric is put into the opening solution, the opening bath ratio is 1:3-10, and then the temperature is raised to 90-130℃ at a temperature raising speed of 0.5-2℃ / min, and the temperature is kept for 20-80 min; after the temperature keeping is finished, the temperature is lowered to below 80℃, the solution is discharged, washed with water, and dried at 60-100℃ for 3-20 min. The promoting agent is a long-chain alkyl surfactant with four cationic groups

preparation method reference: Cui Congcong et al., Synthesis and performance evaluation of multi-head quaternary ammonium salt surfactant [J], China Daily Chemical Industry (English), Vol. 53, No. 8, 899-907

[0032]

[0033] wherein: m = 6-16; n = 0-5; X = Cl or Br.

[0034] Example 1

[0035] The opening process of the stock dyeing suede in this example is as follows:

[0036] The stock dyeing suede is subjected to opening processing by using overflow dyeing machine. The opening solution is prepared by dissolving sodium hydroxide and accelerant in water, wherein the concentration of sodium hydroxide is 0.2 g / L and the concentration of accelerant is 0.05 mmol / L. Then the stock dyeing suede is put into the opening solution with a bath ratio of 1:5, and the temperature is raised to 110°C at a rate of 1°C / min, and the temperature is kept for 50 min. After the temperature is kept, the temperature is lowered to below 80°C, and the solution is drained, washed and dried at 80°C for 10 min.

[0037] The structure of the opening accelerant is as follows:

[0038]

[0039] The synthesis method of the opening accelerant used in Example 1 is as follows:

[0040] The 1,8-dibromooctane is dissolved in acetonitrile, and anhydrous potassium carbonate is added. While stirring, diethylamine is slowly added dropwise, and the reaction temperature is raised to 80°C. After 10 h of reaction, the anhydrous potassium carbonate is removed by suction filtration, and acetonitrile and excess diethylamine are removed by rotary evaporation. Finally, the yellow residue is dissolved in ethyl acetate, and the upper organic phase is taken and dried by adding anhydrous sodium sulfate. The ethyl acetate is removed by rotary evaporation to obtain yellow transparent N,N,N,N-tetraethyl-1,8-octanediamine, which is an intermediate for synthesizing the multi-headed quaternary ammonium salt.

[0041] The intermediate is dissolved in anhydrous ethanol, and an appropriate amount of 1,4-p-dichlorobenzyl is added. After complete dissolution, the temperature is raised to 80°C, and the reaction is carried out for 40-50 h. After the reaction is completed, most of the anhydrous ethanol is removed by rotary evaporation, and a small amount of solution is left. Slowly add acetone, and scrape the white substance precipitated at the bottom. Finally, the white solid is recrystallized from acetone for three times to obtain the target product.

[0042] The opening accelerant prepared in Example 1 is subjected to infrared spectrum analysis on a Fourier transform infrared spectrometer with a scanning wavelength of 4000-500 cm -1 , and a resolution of 4 cm -1 . The infrared spectrum of the opening accelerant prepared in Example 1 is shown in Figure 1 . As can be seen from Figure 1 , the wavelength of 2923.12 cm-1 vibration peak of -CH3stretching vibration peak; 2852.73 cm -1 vibration peak of -CH2stretching vibration peak; 708.24 cm -1 vibration peak of -CH2stretching vibration peak; 708.24 cm n vibration peak of -CH2stretching vibration peak; 708.24 cm -1 vibration peak of -CH2stretching vibration peak; 708.24 cm -1 vibration peak of -CH2stretching vibration peak; 708.24 cm -1 vibration peak of -CH2stretching vibration peak; 708.24 cm.

[0043] Example 2

[0044] The opening method of the stock dyeing suede in this example is as follows:

[0045] The stock dyeing suede is subjected to opening processing by using overflow dyeing machine. The opening solution is prepared by dissolving sodium hydroxide and accelerator in water. The concentration of sodium hydroxide is 0.2 g / L, and the concentration of accelerator is 0.001 mmol / L. Then the stock dyeing suede is put into the opening solution, and the bath ratio is 1:10. The temperature is raised to 130℃ at a rate of 0.5℃ / min, and the temperature is kept for 60 min. After the temperature is kept, the temperature is lowered to below 80℃, and the solution is drained. Then the fabric is washed and dried at 70℃ for 15 min.

[0046] The structure of the opening accelerator is as follows:

[0047]

[0048] Example 3

[0049] The opening method of the stock dyeing suede in this example is as follows:

[0050] The stock dyeing suede is subjected to opening processing by using overflow dyeing machine. The opening solution is prepared by dissolving sodium hydroxide and accelerator in water. The concentration of sodium hydroxide is 0.2 g / L, and the concentration of accelerator is 0.001 mmol / L. Then the stock dyeing suede is put into the opening solution, and the bath ratio is 1:10. The temperature is raised to 130℃ at a rate of 0.5℃ / min, and the temperature is kept for 60 min. After the temperature is kept, the temperature is lowered to below 80℃, and the solution is drained. Then the fabric is washed and dried at 70℃ for 15 min.

[0051] The structure of the opening accelerator is as follows:

[0052]

[0053] Example 4

[0054] The opening method of the stock dyeing suede of the present embodiment is as follows:

[0055] The stock dyeing suede is subjected to opening processing by using an overflow dyeing machine. The opening processing process is that sodium hydroxide and a promoter are dissolved in water to prepare an opening solution, the concentration of the sodium hydroxide is 1.3 g / L, the concentration of the promoter is 0.04 mmol / L, then the stock dyeing suede is put into the opening solution, the opening bath ratio is 1:5.5, then the temperature is raised to 115℃ at a temperature raising speed of 1.4℃ / min, and the temperature is kept for 40 min, after the temperature keeping is finished, the temperature is lowered to below 80℃, the solution is drained, washed with water, and dried at 90℃ for 5 min.

[0056] The structure of the opening promoter is as follows:

[0057]

[0058] Example 5

[0059] The opening method of the stock dyeing suede of the present embodiment is as follows:

[0060] The stock dyeing suede is subjected to opening processing by using an overflow dyeing machine. The opening processing process is that sodium hydroxide and a promoter are dissolved in water to prepare an opening solution, the concentration of the sodium hydroxide is 0.8 g / L, the concentration of the promoter is 0.005 mmol / L, then the stock dyeing suede is put into the opening solution, the opening bath ratio is 1:8.6, then the temperature is raised to 98℃ at a temperature raising speed of 0.75℃ / min, and the temperature is kept for 70 min, after the temperature keeping is finished, the temperature is lowered to below 80℃, the solution is drained, washed with water, and dried at 100℃ for 3 min.

[0061] The structure of the opening promoter is as follows:

[0062]

[0063] Example 6

[0064] The opening method of the stock dyeing suede of the present embodiment is as follows:

[0065] The stock dyeing suede is subjected to opening processing by using an overflow dyeing machine. The opening processing process is that sodium hydroxide and a promoter are dissolved in water to prepare an opening solution, the concentration of the sodium hydroxide is 1.7 g / L, the concentration of the promoter is 0.017 mmol / L, then the stock dyeing suede is put into the opening solution, the opening bath ratio is 1:5.5, then the temperature is raised to 123℃ at a temperature raising speed of 1.9℃ / min, and the temperature is kept for 55 min, after the temperature keeping is finished, the temperature is lowered to below 80℃, the solution is drained, washed with water, and dried at 60℃ for 20 min.

[0066] The structure of the fiber opening accelerator is as follows:

[0067]

[0068] Example 7

[0069] The fiber opening method of the stock dyeing suede in this example is as follows:

[0070] The stock dyeing suede is subjected to fiber opening processing by using an overflow dyeing machine. The fiber opening solution is prepared by dissolving sodium hydroxide and an accelerator in water. The concentration of the sodium hydroxide is 1.6 g / L, and the concentration of the accelerator is 0.035 mmol / L. Then, the stock dyeing suede fabric is put into the fiber opening solution, and the fiber opening bath ratio is 1:3.5. The temperature is raised to 115°C at a temperature raising speed of 0.85°C / min, and the temperature is kept for 65 min. After the temperature keeping, the temperature is lowered to below 80°C, the solution is drained, the fabric is washed, and the fabric is dried at 80°C for 10 min.

[0071] The structure of the fiber opening accelerator is as follows:

[0072]

[0073] Example 8

[0074] The fiber opening method of the stock dyeing suede in this example is as follows:

[0075] The stock dyeing suede is subjected to fiber opening processing by using an overflow dyeing machine. The fiber opening solution is prepared by dissolving sodium hydroxide and an accelerator in water. The concentration of the sodium hydroxide is 1.9 g / L, and the concentration of the accelerator is 0.045 mmol / L. Then, the stock dyeing suede fabric is put into the fiber opening solution, and the fiber opening bath ratio is 1:7.5. The temperature is raised to 105°C at a temperature raising speed of 1.2°C / min, and the temperature is kept for 65 min. After the temperature keeping, the temperature is lowered to below 80°C, the solution is drained, the fabric is washed, and the fabric is dried at 70°C for 15 min.

[0076] The structure of the fiber opening accelerator is as follows:

[0077]

[0078] Implementation effects of the present application

[0079] After the stock dyeing suede fabric is subjected to fiber opening processing by using the fiber opening methods in Examples 1-8, the following tests are performed on the fabric, and the test results are shown in Table 1.

[0080] 1) Measurement of opening rate: To verify the opening promoting effect of opening promoters on the dispersion dyes or organic pigment stock solution colored suede fabric, the sample after opening treatment was dried in an electric thermostatic drying oven at 80℃, then the temperature was increased to 105℃ and dried for 4h, then quickly weighed on an electronic balance, and the opening rate was calculated according to formula (1), wherein W0 and W1 are the absolute dry weights of the sample before and after treatment, respectively.

[0081]

[0082] 2) Measurement of dyeing depth:

[0083] The apparent color depth K / S value of the dyed fabric was measured on Color-Eye 7000A with D65 light source and 10° visual angle, four different positions of each sample were tested, and the average value was taken.

[0084] 3) Measurement of color fastness:

[0085] The soaping fastness was measured according to GB / T 3921.1-2008 "Textiles - Color fastness tests - Color fastness to soaping: Test 1", and the rubbing fastness was measured according to GB / T 3920-2008 "Textiles - Color fastness tests - Color fastness to rubbing".

[0086] 4) The opening of suede was observed by scanning electron microscope at 2500 times magnification, as shown in Figure 2 , Figure 3 and Figure 4 .

[0087] Table 1 Test results of stock solution colored suede fabric after opening finishing processing

[0088]

[0089] Note: The opening methods of comparative samples 1-8 correspond to the methods of examples 1-8 one by one, the difference is that the opening promoter in the finishing solution of comparative samples 1-3 is monocationic surfactant dodecyltrimethylammonium chloride (1227) ， The opening promoter in the finishing solution of comparative samples 4-6 is imidazole-based double cation Gemini surfactant 2-bromo-1-(1-n-butyl-3-n-decyl imidazole)-1-n-decyl imidazole, and the opening promoter in the finishing solution of comparative samples 7-8 is Gemini surfactant 31165 (tetraalkyl triquaternary ammonium salt containing 15 polyoxyethylene ethers).

[0090] The process method of Comparative Sample 9 is as follows: the original solution colored suede is subjected to fiber opening processing by using an overflow dyeing machine, the fiber opening processing process is that sodium hydroxide and a promoter 1227 are dissolved in water to prepare a fiber opening solution, the concentration of the sodium hydroxide is 20 g / L, the concentration of the promoter is 0.5 mmol / L, then the original solution colored suede fabric is put into the fiber opening solution, the fiber opening bath ratio is 1:8, then the temperature is raised to 120℃ at a temperature raising speed of 1℃ / min, the temperature is kept for 60 min, after the temperature keeping is finished, the temperature is lowered to below 80℃, the solution is drained, washed with water and dried.

[0091] As shown in Table 1, the four cationic group long chain alkyl surfactants of the present application are used to replace the traditional promoter as a dispersing dye or organic pigment original solution colored suede fabric fiber opening promoter, the fiber opening effect of the suede fabric after processing meets the actual application requirements, the dyeing fastness of the suede fabric is consistent with that before fiber opening and is not reduced. As shown in Comparative Samples 1-8, after the promoter is replaced by the single cationic surfactant dodecyl trimethyl ammonium chloride (1227), the imidazole double cationic Gemini surfactant 2-bromo-1-(1-n-butyl-3-n-decyl imidazole)-1-n-decyl imidazole or the Gemini surfactant 31165 (a four alkyl trimethyl ammonium salt containing 15 polyoxyethylene ethers), under the same conditions, the dyeing fastness of the suede fabric is not affected, but the fiber opening rate of the fabric is all below 5%, which does not meet the requirements. This is because the amount of the promoter in Comparative Samples 1-8 is too low, which also shows that the promoter used in the present application can have excellent fiber opening effect under the condition of a lower amount. As shown in Comparative Sample 9, the amount of sodium hydroxide is increased to 20 g / L, and 1227 is used as the promoter, the fiber opening rate of the suede fabric meets the requirements, but the dyeing fastness (fading, staining, rubbing fastness) of the fabric is significantly reduced, and the individual fastness is reduced to below grade 3. Therefore, the fiber opening promoter developed in the present application reduces the amount of alkali agent in the process of opening the dispersing dye or organic pigment original solution colored suede fabric, effectively avoiding the discoloration, color loss and fastness reduction of the suede fabric.

[0092] Figure 2 is the SEM of the original dispersing dye original solution colored suede, Figure 3 is the SEM of the sample of Example 1, Figure 4 is the SEM of the sample of Comparative Sample 1. As shown in Figure 3 compared with Figure 2 , the diameter of the good fibers after fiber opening treatment is obviously smaller, and the fibers are thinner, which shows that the fiber opening effect is obvious. As shown in Figure 4 compared with Figure 2 , the diameter of the good fibers after fiber opening treatment is slightly smaller, which shows that the fiber opening effect is not significant.

[0093] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for opening a dope-colored suede, characterized by: The sodium hydroxide and a promoter are dissolved in water to prepare an opening solution, then the suede fabric colored by the dispersion dye or organic pigment stock solution is put into the opening solution, and then heated to a specific temperature for preservation, after the preservation, the temperature is decreased, the solution is drained, washed and dried; the promoter is a long chain alkyl surfactant with four cationic groups.

2. The method of claim 1, wherein the dope-colored suede is opened. The concentration of the sodium hydroxide is 0.2-2 g / L.

3. The method of claim 1, wherein the dope-colored suede is opened. The concentration of the promoter is 0.001-0.05 mmol / L.

4. The method of claim 1, wherein the dope-colored suede is opened. The suede fabric colored by the dispersion dye or organic pigment stock solution is put into the opening solution, and the opening bath ratio is 1: (3-10).

5. The method of claim 1, wherein the dope colored suede is characterized by: The temperature is increased to 90-130℃ at a temperature increasing rate of 0.5-2℃ / min, and the preservation is performed for 20-80 min.

6. The method of claim 1, wherein the dope colored suede is characterized by: After the preservation, the temperature is decreased to below 80℃.

7. The method of claim 1, wherein the dope colored suede is opened. The drying temperature is 60-100℃, and the drying time is 3-20 min.

8. The method of claim 1, wherein the dope colored suede is characterized by: The long chain alkyl surfactant with four cationic groups has the following structure: In the formula, m=6-16; n=0-5; X=Cl or Br.

9. The method according to any one of claims 1 to 8, wherein the dope colored suede is opened. The overflow dyeing machine is used to perform the opening processing on the suede fabric colored by the dispersion dye or organic pigment stock solution.

10. The stock solution colored suede prepared by the opening method of claim 9.

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