Cold dyeing method of textile

Abstract

The invention discloses a cold dyeing method of a textile, which comprises the following steps: soaking the textile subjected to NaOH water washing treatment in dye liquor for normal-temperature dyeing, dewatering, baking and water washing. According to the cold dyeing method of the textile, the specific type of dye, the color fixing agent, the adhesive and the chelating dispersant are matched according to a certain concentration to prepare the dye liquor for low-temperature dyeing, and a specific baking process is combined, so that the cold-dyed textile is high in color fixation rate, low in dyeing defect, high in dyeing fastness and low in hand feeling hardness. The cold dyeing method of the textile does not need to depend on high temperature, avoids consumption of heat energy, is low in energy consumption, low in wastewater COD and free of heavy metal residues, and is suitable for dyeing of textile materials such as cotton, hemp, silk and / or wool.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile and dyeing finishing. More specifically, the present invention relates to a cold dyeing method for textiles. Background Art

[0002] Traditional dyeing techniques usually adopt high-temperature dyeing. Although good dyeing effects can be obtained, there are also problems such as insufficient color fastness (washing color fastness ≤ grade 3) caused by dye decomposition, high energy consumption (energy consumption accounts for more than 60%), high wastewater COD value (≥500mg / L), and environmental pollution.

[0003] In order to meet the market demand, cold dyeing techniques have gradually received attention. Although the existing cold dyeing techniques reduce the dyeing temperature and energy consumption compared with high-temperature dyeing, there are technical shortcomings such as low fixation rate (<60%), color blooming (>20%), low color fastness (2 - 3 grades), and hard hand feeling, which cannot meet the requirements of the high-end market for color persistence and comfort.

[0004] In addition, traditional cold dyeing processes usually also use organic compounds containing heavy metal chelating agents (such as EDTA), which are difficult to meet the restrictions on the use of heavy metals in the EU REACH regulations. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a cold dyeing method for textiles with high fixation rate, low color blooming rate, and high dyeing fastness.

[0006] The technical solutions to achieve the above purpose are as follows.

[0007] In the first aspect of the present invention, a cold dyeing method for textiles is provided, including the following steps:

[0008] (1) Immerse the textiles after being treated with NaOH washing in the dye liquor for normal-temperature dyeing; the dye liquor includes 1g / L - 5g / L of Linex surt type dye, 0.1g / L - 0.3g / L of fst tx-c type fixing agent, 30g / L - 50g / L of linex sup type binder, and 0.4g / L - 0.6g / L of VJ812 type chelating dispersant;

[0009] (2) Dehydrate the textiles dyed in step (1);

[0010] (3) Lay the dehydrated textiles in step (2) flat, first bake at 45°C - 55°C for 8min - 12min, then raise the temperature to 88°C - 92°C at a rate of 1°C / min - 2°C / min and bake for 8min - 12min;

[0011] (4) Wash the baked textiles in step (3) at normal temperature.

[0012] The second aspect of the present invention provides a textile prepared by the above cold dyeing method.

[0013] The cold dyeing method of the textile of the present invention is to prepare a dyeing solution by mixing specific types of dyes, fixing agents, adhesives, and chelating dispersants at a certain concentration, perform room temperature dyeing, and combine with a specific baking process. Under a complete set of dyeing processes, the affinity and binding force between the dye and the textile fiber are enhanced at low temperature. The textile after cold dyeing has a high fixation rate, low color mottling, high dyeing fastness, and low hand feel hardness.

[0014] In addition, the cold dyeing method of the textile of the present invention does not rely on high temperature, avoids heat energy consumption, has low energy consumption, low wastewater COD, no heavy metal residues, and is applicable to the dyeing of textile materials such as cotton, linen, silk, and / or wool. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram of the finished fabric after cold dyeing in Example 1 of the present invention.

[0016] Figure 2 It is a diagram of the finished fabric after cold dyeing in Example 2 of the present invention.

[0017] Figure 3 It is a diagram of the finished fabric after cold dyeing in Comparative Example 1 of the present invention.

[0018] Figure 4 It is a diagram of the finished fabric after cold dyeing in Comparative Example 2 of the present invention.

[0019] Figure 5 It is a diagram of the finished fabric after cold dyeing in Comparative Example 3 of the present invention.

[0020] Figure 6 It is a diagram of the finished fabric after cold dyeing in Comparative Example 4 of the present invention.

[0021] Figure 7 It is a diagram of the finished fabric after cold dyeing in Comparative Example 5 of the present invention.

[0022] Figure 8 It is a diagram of the finished fabric after cold dyeing in Comparative Example 6 of the present invention.

[0023] Figure 9 It is a diagram of the finished fabric after cold dyeing in Comparative Example 7 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] The technical solutions of the present invention will be further described below through specific examples. Those skilled in the art should understand that the examples are only for helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] In some embodiments of the present invention, a cold dyeing method for textiles is disclosed, comprising the following steps:

[0027] (1) Soak the textiles after being treated with NaOH washing water (to remove impurities and grease) in the dye liquor for normal temperature dyeing; the dye liquor comprises 1 g / L to 5 g / L of Linex surt type dye, 0.1 g / L to 0.3 g / L of fst tx-c type fixing agent, 30 g / L to 50 g / L of linex sup type binder, and 0.4 g / L to 0.6 g / L of VJ812 type chelating dispersant;

[0028] (2) Dehydrate the textiles dyed in step (1).

[0029] (3) Lay the dehydrated textiles flat, first bake at 45°C to 55°C for 8 min to 12 min, then raise the temperature to 88°C to 92°C at a rate of 1°C / min to 2°C / min and bake for 8 min to 12 min;

[0030] (4) Wash the baked textiles in step (3) at normal temperature.

[0031] In some embodiments, the dye liquor in step (1) comprises 2 g / L to 3 g / L of Linex surt type dye, 0.15 g / L to 0.25 g / L of fst tx-c type fixing agent, 35 g / L to 40 g / L of linex sup type binder, and 0.45 g / L to 0.55 g / L of VJ812 type chelating dispersant.

[0032] In some embodiments, in step (3), first bake at 48°C to 52°C for 8 min to 12 min, then raise the temperature to 89°C to 91°C at a rate of 1°C / min to 2°C / min and bake for 8 min to 12 min.

[0033] In some embodiments, the mass ratio of the textiles to the dye liquor in step (1) is 1:40 to 60.

[0034] In some embodiments, the mass ratio of the textiles to the dye liquor in step (1) is 1:45 to 55.

[0035] In some embodiments, the dyeing time in step (1) is 10 min to 30 min.

[0036] In some of these embodiments, the concentration of NaOH in step (1) is 1.5 g / L to 2.5 g / L, the temperature of the washing water is 80 °C, and the time of the washing water is 20 min to 40 min.

[0037] In some of these embodiments, the dehydration in step (2) is dehydration at 1300 to 1500 revolutions for 15 s to 25 s.

[0038] In some of these embodiments, the time of the washing water in step (4) is 8 min to 12 min.

[0039] In some of these embodiments, the textile in step (1) is cotton, linen, silk and / or wool textile.

[0040] In some other embodiments of the present invention, textiles prepared by the above cold dyeing method are disclosed.

[0041] In the following examples, the Linex surt type dye and fst tx-c type fixing agent used were purchased from KEMIN Company, the linex sup type binder was purchased from Huntsman Company, the VJ812 type chelating dispersant was purchased from Dongguan Xiangtao Company, the binder PDA was purchased from Shanghai Auxiliary Factory, and the coating HH series was purchased from Zhejiang Nami New Materials.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0043] Example 1 Cold Dyeing Method of Textiles

[0044] It includes the following steps:

[0045] 1. Fabric Preparation

[0046] Prepare pure cotton plain-woven ready-made clothing fabric, add 2 g / L of NaOH, wash with water at 80 °C for 30 min to remove impurities, grease, etc., and dry for standby;

[0047] 2. Prepare the Dyeing Solution

[0048] Add the Linex surt type dye (final concentration of 3 g / L), fst tx-c type fixing agent (final concentration of 0.2 g / L), linex sup type binder (final concentration of 35 g / L), and VJ812 type chelating dispersant (final concentration of 0.5 g / L) to 1 L of soft water, and stir well to obtain the dyeing solution;

[0049] 3. Dyeing

[0050] According to the weight ratio of the fabric to be dyed to the dyeing solution of 1:50, in the dyeing solution tank, completely immerse the fabric to be dyed in the dyeing solution, soak at room temperature for 20 min, lift the fabric, and evenly squeeze out the excess dyeing solution;

[0051] 4. Dehydration

[0052] The liquid content rate of the dyed fabric is 95%, and it is dehydrated at 1400 revolutions per minute for 20 s by a dehydrator;

[0053] 5. Baking

[0054] Lay the dehydrated fabric flat in a dryer, bake it at 50 °C for 10 min first, then raise the temperature to 90 °C at a rate of 1 °C / min and bake for 10 min;

[0055] 6. Washing

[0056] Wash the baked fabric for 10 min, air dry it, and then the dyed finished fabric is obtained, as Figure 1 shown.

[0057] Example 2 Cold Dyeing Method for Textiles

[0058] It includes the following steps:

[0059] 1. Fabric Preparation

[0060] Prepare pure cotton plain-woven ready-made clothing fabric, add 2 g / L of NaOH, wash it at 80 °C for 30 min to remove impurities, grease, etc., and air dry it for standby;

[0061] 2. Preparation of Dyeing Solution

[0062] Add Linex surt type dye (final concentration 2 g / L), fst tx-c type fixing agent (final concentration 0.2 g / L), linexsup type binder (final concentration 40 g / L), and VJ812 type chelating dispersant (final concentration 0.5 g / L) to 1 L of soft water, stir well to obtain the dyeing solution;

[0063] 3. Dyeing

[0064] According to the weight ratio of the fabric to be dyed to the dyeing solution of 1:50, in the dyeing solution tank, completely immerse the fabric to be dyed in the dyeing solution, soak it at room temperature for 15 min, lift the fabric, and evenly squeeze out the excess dyeing solution;

[0065] 4. Dehydration

[0066] Dehydrate the dyed fabric at 1400 revolutions per minute for 20 s by a dehydrator;

[0067] 5. Baking

[0068] Lay the dehydrated fabric flat in a dryer, bake it at 50 °C for 10 min first, then raise the temperature to 90 °C at a rate of 1 °C / min and bake for 10 min;

[0069] 6. Washing

[0070] The baked fabric is washed with water for 10 minutes, dried in the air, and the dyed finished fabric is obtained as follows Figure 2 as shown.

[0071] Comparative Example 1

[0072] For the cold dyeing method of the textile in this comparative example, except that when preparing the dye solution in step 2, ordinary dyes are used (including a coating (HH series) with a final concentration of 0.3 g / L and an adhesive PDA with a final concentration of 20 g / L), and in step 5, the dehydrated fabric is laid flat in a dryer, baked at 50 °C for 10 minutes first, then raised to 65 °C at a rate of 1 °C / min and baked for 10 minutes, all other steps are the same as in Example 1. The dyed finished fabric is as follows Figure 3 as shown.

[0073] Comparative Example 2

[0074] For the cold dyeing method of the textile in this comparative example, except that when preparing the dye solution in step 2, Polyfix FC fixing agent is used, all other steps are the same as in Example 1. The dyed finished fabric is as follows Figure 4 as shown.

[0075] Comparative Example 3

[0076] For the cold dyeing method of the textile in this comparative example, except that when preparing the dye solution in step 2, acrylate binder is used, all other steps are the same as in Example 1. The dyed finished fabric is as follows Figure 5 as shown.

[0077] Comparative Example 4

[0078] For the cold dyeing method of the textile in this comparative example, except that when preparing the dye solution in step 2, EDTA chelating dispersant is used, all other steps are the same as in Example 1. The dyed finished fabric is as follows Figure 6 as shown.

[0079] Comparative Example 5

[0080] For the cold dyeing method of the textile in this comparative example, except that when preparing the dye solution in step 2, 0.5 g / L of fsttx-c type fixing agent and 20 g / L of linex sup type binder are used, all other steps are the same as in Example 1. The dyed finished fabric is as follows Figure 7 as shown.

[0081] Comparative Example 6

[0082] For the cold dyeing method of the textile in this comparative example, except that when baking in step 5, bake at 50 °C for 10 minutes first, then directly raise to 90 °C and bake for 10 minutes, all other steps are the same as in Example 1. The dyed finished fabric is as follows Figure 8 as shown.

[0083] Comparative Example 7

[0084] The cold dyeing method of the textile in this comparative example is the same as that in Example 1 in all steps except that during the baking in Step 5, it is first baked at 50 °C for 10 min, then heated to 90 °C at a rate of 3 °C / min and baked for 10 min. The dyed finished fabric is as Figure 9 shown.

[0085] The washing fastness, rubbing fastness, fixation rate, color blooming rate, hand feel hardness, heavy metal residue, COD value and other properties of each example and comparative example were detected.

[0086] Among them, the washing fastness and rubbing fastness were detected with reference to the standard of GB / T18132-2016; the hand feel hardness of fabrics in the textile industry was detected with reference to "New Standard for Hand Feel and Touch FZ / T 01166-2022", the heavy metal residue was detected with reference to GB / T 17593 "Determination of Heavy Metals in Textiles", the COD value was detected with reference to the latest 2021 GB 4287-2012 Discharge Standard of Water Pollutants (COD) for Textile Dyeing and Finishing Industry, and the fixation rate was determined by spectrophotometry.

[0087] The results are shown in Table 1.

[0088] Table 1

[0089]

[0090] It can be seen from the results in Table 1 that for the textiles dyed by the cold dyeing method of the present invention, the washing fastness reaches 3-4 levels, the rubbing fastness reaches 4-5 levels, the fixation rate exceeds 90%, the color blooming rate is lower than 15%, and the hand feel hardness is low, the heavy metal residue is qualified, and the generated COD value is low.

[0091] Compared with Example 1, Comparative Example 1 uses a common dye of coating + binder and a different baking process (lower baking temperature), resulting in a significant decrease in washing fastness and rubbing fastness, an obvious decrease in fixation rate, an obvious increase in color blooming rate and hand feel hardness, and detected heavy metal residue, with a high COD value and being not environmentally friendly.

[0092] Compared with Example 1, the dyeing solutions in Comparative Examples 2-4 are prepared with different fixing agents, binders and chelating dispersants respectively, and the fixation rate, washing fastness and rubbing fastness are all significantly reduced. Among them, when an acrylate binder is used in the dyeing solution, the abrasion resistance of the dyed textile drops to 1-2 levels (Comparative Example 3). The use of the chelating dispersant EDTA will not only affect indicators such as fixation rate, washing fastness and rubbing fastness, but also the hand feel hardness of the textile is high, and at the same time the heavy metal residue and COD value are very high (Comparative Example 4).

[0093] Compared with Example 1, in the dye liquor of Comparative Example 5, the dosage of the fst tx-c type fixing agent was increased, and the dosage of the linex sup type binder was reduced. The washing fastness and rubbing fastness of the dyed textile were not ideal, but other properties were very superior, indicating that the ratio of each component in the dye liquor is very crucial for the properties of the dyed textile, especially the fastness properties.

[0094] Compared with Example 1, the baking process of Comparative Example 6 did not adopt the gradient heating process, and the gradient heating of the baking process of Comparative Example 7 was too fast. The washing fastness, rubbing fastness and fixation rate of the dyed textile were all affected, and the hand feeling hardness also increased significantly.

[0095] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0096] The above-described embodiments merely represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A cold dyeing method for textiles, characterized in that: The following steps are involved: (1) soaking the textile treated with NaOH in a dyeing solution for room temperature dyeing; the dyeing solution comprises 1 g / L to 5 g / L of Linex surt dye, 0.1 g / L to 0.3 g / L of fst tx-c color fixing agent, 30 g / L to 50 g / L of linexsup adhesive and 0.4 g / L to 0.6 g / L of VJ812 chelating dispersant; (2) dehydrating the textile dyed in step (1); (3) laying the textile dehydrated in step (2) flat, first baking at 45°C to 55°C for 8min to 12min, then heating the temperature at 1°C / min to 2°C / min to 88°C to 92°C, and baking for 8min to 12min; (4) washing the textiles baked in step (3) at room temperature.

2. The cold dyeing method for textiles according to claim 1, characterized in that: The dye liquor in step (1) comprises 2g / L to 4g / L of Linex surt dye, 0.15g / L to 0.25g / L of fst tx-c color fixing agent, 30g / L to 40g / L of linex sup adhesive and 0.45g / L to 0.55g / L of VJ812 chelating dispersant; preferably, the dye liquor comprises 2g / L to 3g / L of Linex surt dye, 0.18g / L to 0.22g / L of fst tx-c color fixing agent, 35g / L to 40g / L of linex sup adhesive and 0.48g / L to 0.52g / L of VJ812 chelating dispersant.

3. The cold dyeing method for textiles according to claim 1, characterized in that: In step (3), the mixture is first baked at 48°C to 52°C for 8min to 12min, then the temperature is raised to 89°C to 91°C at 1°C / min to 2°C / min, and then baked for 8min to 12min.

4. The cold dyeing method for textiles according to claim 1, characterized in that: The mass ratio of the textile to the dye liquor in step (1) is 1:40-60, preferably 1:45-55.

5. The cold dyeing method for textiles according to claim 1, characterized in that: The dyeing time in step (1) is 10 min to 30 min.

6. The cold dyeing method for textiles according to claim 1, characterized in that: The concentration of NaOH in step (1) is 1.5 g / L to 2.5 g / L; And / or, the temperature of the washing water is 80° C., and the washing time is 20 min to 40 min.

7. The cold dyeing method for textiles according to any one of claims 1 to 6, characterized in that: The dehydration in step (2) is performed at 1300 to 1500 rpm for 15 to 25 seconds.

8. The cold dyeing method for textiles according to any one of claims 1 to 6, characterized in that: The washing time in step (4) is 8 minutes to 12 minutes.

9. The cold dyeing method for textiles according to any one of claims 1 to 6, characterized in that: The textile in step (1) is cotton, linen, silk and / or wool textile.

10. A textile produced by the cold dyeing method according to any one of claims 1 to 9.

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