Dyeing method of bio-based polyvinyl alcohol collagen composite fiber or fabric thereof
By wetting and rolling the bio-based polyvinyl alcohol collagen composite fiber or its fabric before dyeing and adding sodium sulfate, combined with low-temperature dyeing and graded water washing, the adverse effects of traditional reactive dyeing process on fiber properties are solved and a green and environmentally friendly dyeing effect is achieved.
Patent Information
- Application Number
- CN202510893322.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-10-17
AI Technical Summary
The traditional reactive dyeing process has a great impact on the feel and tensile properties of bio-based polyvinyl alcohol collagen composite fibers or their fabrics under high temperature and alkaline conditions, and has problems of high energy consumption and high wastewater.
Before dyeing, the bio-based polyvinyl alcohol collagen composite fiber or its fabric is wetted and rolled, and sodium sulfate is added to the active dyeing solution. The washing method is adjusted and the low-temperature dyeing and graded washing processes are adopted to avoid damage to the performance of the composite fiber or its fabric.
The dyeing rate and soaping fastness are improved, the touch of the composite fiber or its fabric is kept soft, the damage to the fiber performance caused by high temperature is avoided, the dyeing and soaping temperature is lowered, and the energy consumption and wastewater discharge are reduced.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of textiles, and particularly relates to a dyeing method of a bio-based polyvinyl alcohol collagen composite fiber or fabric thereof. BACKGROUND
[0002] Polyvinyl alcohol (PVA for short) is a water-soluble polymer material with a polyol structure, which is widely used in the textile field due to its unique water solubility, film forming property, adhesion and biocompatibility. PVA can be used as a processing aid such as warp sizing agent, adhesive, functional finishing agent, etc., and can also be used as a textile raw material to prepare fibers. The fibers prepared by using PVA as a textile raw material are non-toxic and non-irritating, and have high tensile strength, moisture absorption and wear resistance, but the hand feeling is hard and the toughness is insufficient, and the wet state is easy to soften.
[0003] Collagen is characterized by a triple helix structure, rich in proline and hydroxyproline, and can form a fiber network through self-assembly. The flexible segment of the fiber network can be embedded in the gap between the PVA crystalline region, and the physical entanglement and hydrogen bonding of the amorphous region molecular chain can form a semi-interpenetrating network with PVA. The semi-interpenetrating network formed by collagen and PVA can maintain the tensile strength of PVA collagen composite fiber at a level comparable to that of pure PVA fiber, while significantly improving the elongation at break and energy absorption capacity of PVA collagen composite fiber.
[0004] Compared with traditional petroleum-based polyvinyl alcohol collagen composite fibers, bio-based polyvinyl alcohol collagen composite fibers have the advantages of green environmental protection, biodegradability, and skin-friendly softness, but have the disadvantages of poor high-temperature resistance and poor acid and alkali resistance. The production cost of reactive dyes is low, the color fastness is high, and the dyeing effect is good. The traditional reactive dyeing process usually needs to be carried out at a temperature of 60-95℃, using sodium sulfate and soda ash for dyeing and fixing. However, high temperature and alkaline conditions have a great impact on the hand feeling and tensile properties of bio-based polyvinyl alcohol collagen composite fibers. Moreover, the traditional reactive dyeing process also has high energy consumption and high wastewater, resulting in high production cost and high wastewater treatment volume of reactive dyeing. SUMMARY
[0005] In view of the technical problem that the high temperature and soda conditions of the traditional reactive dyeing process have a great impact on the hand feeling and tensile properties of bio-based polyvinyl alcohol collagen composite fibers or fabrics thereof, the present application provides a dyeing method of bio-based polyvinyl alcohol collagen composite fibers or fabrics thereof. The method adds sodium sulfate to the reactive dyeing solution, performs wetting and padding on the bio-based polyvinyl alcohol collagen composite fibers or fabrics thereof before dyeing, and adjusts the washing method, so as to effectively avoid the influence of dyeing on the touch feeling and tensile properties of bio-based polyvinyl alcohol collagen composite fibers or fabrics thereof.
[0006] The technical scheme of the present application is as follows: A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber or fabric thereof, comprising the following steps: Step S1: preparing an active dip dyeing solution, and adding sodium sulfate to the active dip dyeing solution and stirring uniformly; Step S2: wetting and padding the bio-based polyvinyl alcohol collagen composite fiber or fabric thereof, and then completely immersing in the active dip dyeing solution for dyeing; Step S3: washing the dyed bio-based polyvinyl alcohol collagen composite fiber or fabric thereof with cold water for one time, hot water for two times, and cold water for two times in sequence, and then drying to obtain a dyed product.
[0007] Further, in step S1, the active dip dyeing solution is an aqueous solution of reactive dyes, and the amount of the reactive dyes in the active dip dyeing solution is 1%-6% owf, preferably 1% owf, 3% owf and 6% owf.
[0008] Further, in step S1, the amount of sodium sulfate added is 20-60g / L, and the amount of sodium sulfate added is matched with the amount of reactive dyes in the active dip dyeing solution. When the amount of reactive dyes in the active dip dyeing solution is 1% owf, the amount of sodium sulfate added is 20g / L; when the amount of reactive dyes in the active dip dyeing solution is 3% owf, the amount of sodium sulfate added is 40g / L; and when the amount of reactive dyes in the active dip dyeing solution is 6% owf, the amount of sodium sulfate added is 60g / L.
[0009] Further, in step S2, the treatment liquid for wetting and padding is cold water; the padding rate is 60%-65%, and the padding mode is one dip and one pad.
[0010] Further, in step S2, the dyeing bath ratio is 1:50, the dyeing temperature is 48-52℃, preferably 50℃, the dyeing temperature rising rate is 0.5-1.5℃ / min, preferably 1℃ / min, and the dyeing holding time is 25-35min, preferably 30min.
[0011] Further, in step S3, the temperature of the hot water washing is 48-52℃, preferably 50℃.
[0012] Further, in step S3, a soaping agent is added in the second hot water washing, and the amount of the soaping agent is 2-3g / L, preferably 2g / L.
[0013] Further, the soaping agent is a secondary alkyl sulfonate.
[0014] Further, in step S3, the drying temperature is 88-90℃, preferably 90℃.
[0015] Further, the temperature of the cold water is 23-27℃, preferably 25℃.
[0016] The present application has the following advantages: The dyeing method of the bio-based polyvinyl alcohol collagen composite fiber or fabric provided by the present application reduces the amount of active dye and the amount of anhydrous sodium sulfate in the active dip dyeing solution, improves the dyeing rate and soaping fastness, avoids the change of the structure of the composite fiber caused by high ionic strength, and is conducive to maintaining the soft touch of the composite fiber or fabric. The bio-based polyvinyl alcohol collagen composite fiber or fabric is wetted and padded before dyeing, which allows the composite fiber to fully absorb water at low temperature, is conducive to improving the dyeing uniformity of the composite fiber, avoids the thermal denaturation of collagen, and maintains the physical properties of the fiber. The hierarchical washing method of "one cold water washing, two hot water washing, and two cold water washing" is adopted, the first cold water washing quickly terminates the dyeing reaction, the two hot water washing effectively removes the un-fixed dye, and the last two cold water washing cools and sets, which reduces the dyeing and avoids the secondary damage of the composite fiber caused by high-temperature soaping, and balances the soaping fastness and washing efficiency.
[0017] In summary, the dyeing method of the bio-based polyvinyl alcohol collagen composite fiber or fabric provided by the present application eliminates the dyeing and alkali adding process, reduces the dyeing temperature and soaping temperature, and avoids the adverse effects of active dyeing on the breaking strength, breaking elongation, soaping fastness, rubbing fastness, and touch of the bio-based polyvinyl alcohol collagen composite fiber. DETAILED DESCRIPTION
[0018] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.
[0019] Embodiment 1 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add active red SBE to water with a temperature of 25℃ and stir well to prepare an active dip dyeing solution with an active red SBE dosage of 1% owf. The active red SBE is purchased from Jiangsu Shennian Dye Chemical Co., Ltd., and the active red SBE has a strength of 200%. Add anhydrous sodium sulfate to the prepared active dip dyeing solution and stir well, and the amount of anhydrous sodium sulfate added is 20g / L.
[0020] Step S2: The bio-based polyvinyl alcohol collagen composite fiber is introduced into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. The wet and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed into the active dip dyeing liquor according to the bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in the dip dyeing machine for dyeing at 50℃ for 30min.
[0021] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is sequentially washed with cold water at 25℃ for one pass, hot water at 50℃ for two passes, and cold water at 25℃ for two passes. When washing for the second pass with hot water at 50℃, 2g / L of soaping agent SAS is added into the second pass of hot water, and the soaping agent SAS is purchased from the Chemical Industry Company. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in the drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0022] Example 2 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Active red SBE is added into water at a temperature of 25℃ and stirred uniformly to prepare an active dip dyeing liquor with the dosage of active red SBE being 3% owf. The active red SBE is purchased from Jiangsu Shennian Dye Chemical Co., Ltd., and the strength of the active red SBE is 200%. Anhydrous sodium sulfate is added into the prepared active dip dyeing liquor and stirred uniformly, and the added amount of the anhydrous sodium sulfate is 40g / L.
[0023] Step S2: The bio-based polyvinyl alcohol collagen composite fiber is introduced into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. The wet and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed into the active dip dyeing liquor according to the bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in the dip dyeing machine for dyeing at 50℃ for 30min.
[0024] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is sequentially washed with cold water at 25℃ for one pass, hot water at 50℃ for two passes, and cold water at 25℃ for two passes. When washing for the second pass with hot water at 50℃, 2g / L of soaping agent SAS is added into the second pass of hot water, and the soaping agent SAS is purchased from the Chemical Industry Company. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in the drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0025] Example 3 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add Reactive Red SBE into water with temperature of 25℃ and stir well to prepare a reactive dip dyeing liquor with the dosage of Reactive Red SBE of 6% owf. Reactive Red SBE is purchased from Jiangsu Shennian Dyestuff Chemical Co., Ltd., and the strength of Reactive Red SBE is 200%. Add anhydrous sodium sulfate into the prepared reactive dip dyeing liquor and stir well, and the dosage of anhydrous sodium sulfate is 60 g / L.
[0026] Step S2: Introduce the bio-based polyvinyl alcohol collagen composite fiber into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. Dip the wet and padded bio-based polyvinyl alcohol collagen composite fiber into the reactive dip dyeing liquor according to the bath ratio of 1:50, and heat to 50℃ at the heating rate of 1℃ / min in the dip dyeing machine for dyeing for 30 min.
[0027] Step S3: Wash the dyed bio-based polyvinyl alcohol collagen composite fiber with cold water at 25℃ for one time, hot water at 50℃ for two times, and cold water at 25℃ for two times. When washing for the second time with hot water at 50℃, add 2 g / L of soaping agent SAS into the second hot water, and the soaping agent SAS is purchased from Chemical Industry Co., Ltd. Dry the washed bio-based polyvinyl alcohol collagen composite fiber in the drying cylinder at the drying temperature of 90℃ to obtain the dyed product.
[0028] Example 4 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add Reactive Blue SNE into water with temperature of 25℃ and stir well to prepare a reactive dip dyeing liquor with the dosage of Reactive Blue SNE of 1% owf. Reactive Blue SNE is purchased from Jiangsu Shennian Dyestuff Chemical Co., Ltd., and the strength of Reactive Blue SNE is 150%. Add anhydrous sodium sulfate into the prepared reactive dip dyeing liquor and stir well, and the dosage of anhydrous sodium sulfate is 20 g / L.
[0029] Step S2: Introduce the bio-based polyvinyl alcohol collagen composite fiber into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. Dip the wet and padded bio-based polyvinyl alcohol collagen composite fiber into the reactive dip dyeing liquor according to the bath ratio of 1:50, and heat to 50℃ at the heating rate of 1℃ / min in the dip dyeing machine for dyeing for 30 min.
[0030] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is sequentially washed with 25℃ cold water for one pass, 50℃ hot water for two passes, and 25℃ cold water for two passes. When washing the second pass with 50℃ hot water, 2g / L soaping agent SAS is added to the second pass of hot water, and the soaping agent SAS is purchased from the Chemical Industry Company. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in a drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0031] Example 5 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add reactive blue SNE to water at a temperature of 25℃ and stir well to prepare a reactive dip dyeing solution with a reactive blue SNE dosage of 3% owf. The reactive blue SNE is purchased from Jiangsu Shixin Dye Chemical Co., Ltd., and the reactive blue SNE has a strength of 150%. Add anhydrous sodium sulfate to the prepared reactive dip dyeing solution and stir well, and the addition amount of anhydrous sodium sulfate is 40g / L.
[0032] Step S2: The bio-based polyvinyl alcohol collagen composite fiber is introduced into the padding trough containing cold water for one dip and one roll, wherein the temperature of the cold water in the padding trough is 25℃, and the roll-up rate of the padding is 65%. The wetted and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed in the reactive dip dyeing solution according to a bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in a dip dyeing machine for 30min of dyeing.
[0033] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is sequentially washed with 25℃ cold water for one pass, 50℃ hot water for two passes, and 25℃ cold water for two passes. When washing the second pass with 50℃ hot water, 2g / L soaping agent SAS is added to the second pass of hot water, and the soaping agent SAS is purchased from the Chemical Industry Company. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in a drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0034] Example 6 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add reactive blue SNE to water at a temperature of 25℃ and stir well to prepare a reactive dip dyeing solution with a reactive blue SNE dosage of 6% owf. The reactive blue SNE is purchased from Jiangsu Shixin Dye Chemical Co., Ltd., and the reactive blue SNE has a strength of 150%. Add anhydrous sodium sulfate to the prepared reactive dip dyeing solution and stir well, and the addition amount of anhydrous sodium sulfate is 60g / L.
[0035] Step S2: The bio-based polyvinyl alcohol collagen composite fiber is introduced into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. The wet and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed into the active dip dyeing liquor according to the bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in the dip dyeing machine for dyeing at 50℃ for 30min.
[0036] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is sequentially washed with cold water at 25℃ for one pass, hot water at 50℃ for two passes, and cold water at 25℃ for two passes. When washing for the second pass with hot water at 50℃, 2g / L of soaping agent SAS is added into the second pass of hot water, and the soaping agent SAS is purchased from the Chemical Industry Company. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in the drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0037] Example 7 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Active yellow SNE is added into water at a temperature of 25℃ and stirred uniformly to prepare an active dip dyeing liquor with the dosage of active yellow SNE being 1% owf. The active yellow SNE is purchased from Jiangsu Shennian Dye Chemical Co., Ltd., and the strength of the active yellow SNE is 200%. Anhydrous sodium sulfate is added into the prepared active dip dyeing liquor and stirred uniformly, and the added amount of the anhydrous sodium sulfate is 20g / L.
[0038] Step S2: The bio-based polyvinyl alcohol collagen composite fiber is introduced into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. The wet and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed into the active dip dyeing liquor according to the bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in the dip dyeing machine for dyeing at 50℃ for 30min.
[0039] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is sequentially washed with cold water at 25℃ for one pass, hot water at 50℃ for two passes, and cold water at 25℃ for two passes. When washing for the second pass with hot water at 50℃, 2g / L of soaping agent SAS is added into the second pass of hot water, and the soaping agent SAS is purchased from the Chemical Industry Company. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in the drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0040] Example 8 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add Reactive Yellow SNE to water with a temperature of 25℃ and stir well to prepare a reactive dip dyeing liquor with a dosage of 3% owf of Reactive Yellow SNE. Reactive Yellow SNE is purchased from Jiangsu Shixin Dyestuff Chemical Co., Ltd., and the strength of Reactive Yellow SNE is 200%. Add anhydrous sodium sulfate to the prepared reactive dip dyeing liquor and stir well, and the addition amount of anhydrous sodium sulfate is 40g / L.
[0041] Step S2: Introduce the bio-based polyvinyl alcohol collagen composite fiber into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. The wet and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed in the reactive dip dyeing liquor according to a bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in a dip dyeing machine for dyeing for 30min.
[0042] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber is washed with cold water at 25℃ for one time, hot water at 50℃ for two times, and cold water at 25℃ for two times. When washing for the second time with hot water at 50℃, 2g / L of soaping agent SAS is added to the second hot water, and the soaping agent SAS is purchased from Chemical Industry Co., Ltd. The washed bio-based polyvinyl alcohol collagen composite fiber is dried in a drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0043] Example 9 A dyeing method of a bio-based polyvinyl alcohol collagen composite fiber, comprising the following steps: Step S1: Add Reactive Yellow SNE to water with a temperature of 25℃ and stir well to prepare a reactive dip dyeing liquor with a dosage of 6% owf of Reactive Yellow SNE. Reactive Yellow SNE is purchased from Jiangsu Shixin Dyestuff Chemical Co., Ltd., and the strength of Reactive Yellow SNE is 200%. Add anhydrous sodium sulfate to the prepared reactive dip dyeing liquor and stir well, and the addition amount of anhydrous sodium sulfate is 60g / L.
[0044] Step S2: Introduce the bio-based polyvinyl alcohol collagen composite fiber into the padding trough containing cold water for one dip and one pad, wherein the temperature of the cold water in the padding trough is 25℃, and the padding residual rate is 65%. The wet and padded bio-based polyvinyl alcohol collagen composite fiber is completely immersed in the reactive dip dyeing liquor according to a bath ratio of 1:50, and is heated to 50℃ at a heating rate of 1℃ / min in a dip dyeing machine for dyeing for 30min.
[0045] Step S3: The dyed bio-based polyvinyl alcohol collagen composite fiber was washed with cold water at 25℃ for one time, hot water at 50℃ for two times, and cold water at 25℃ for two times. When washing for the second time with hot water at 50℃, 2 g / L of soaping agent SAS was added into the second hot water, and the soaping agent SAS was purchased from Chemical Industry Co., Ltd. The washed bio-based polyvinyl alcohol collagen composite fiber was dried in a drying cylinder at a drying temperature of 90℃ to obtain a dyed product.
[0046] Example 10 Example 10 is only different from Example 1 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0047] Example 11 Example 11 is only different from Example 2 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0048] Example 12 Example 12 is only different from Example 3 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0049] Example 13 Example 13 is only different from Example 4 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0050] Example 14 Example 14 is only different from Example 5 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0051] Example 15 Example 15 is only different from Example 6 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0052] Example 16 Example 16 is only different from Example 7 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0053] Example 17 Example 17 is only different from Example 8 in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0054] Example 18 Example 18 differs from Example 9 only in that the bio-based polyvinyl alcohol collagen composite fiber is replaced by a bio-based polyvinyl alcohol collagen composite fiber fabric.
[0055] Test Example 1 Take the undyed bio-based polyvinyl alcohol collagen composite fiber as sample 1, and test the tensile property indexes of sample 1 and the dyed products obtained in Examples 1-9 according to GB / T 14337-2022 "Chemical Fiber Short Fiber Tensile Property Test Method", and the test results are shown in Table 1.
[0056] Table 1 Tensile property test results of sample and dyed products obtained in Examples 1-9
[0057] Test Example 2 Take the undyed bio-based polyvinyl alcohol collagen composite fiber fabric as sample 2, and test the color fastness and touch of sample 2 and the dyed products obtained in Examples 10-18, and the test results are shown in Table 2.
[0058] Table 2 Color fastness and touch test results of sample 2 and dyed products obtained in Examples 10-18
[0059] As can be seen from Table 1, the low-temperature alkali-free reactive dyeing process of the bio-based polyvinyl alcohol collagen composite fiber has little effect on the breaking strength, breaking strength, breaking elongation and breaking elongation rate of the composite fiber; as can be seen from Table 2, the low-temperature alkali-free reactive dyeing process of the bio-based polyvinyl alcohol collagen composite fiber fabric has no effect on the touch of the fabric, and the soaping fastness and rubbing fastness of the dyed fabric meet the requirements of textile use. Therefore, the improved dyeing method can dye the bio-based polyvinyl alcohol collagen composite fiber or fabric which is not resistant to high temperature and acid and alkali, achieve low-temperature and alkali-free dyeing, and realize the technical effect of green and environmentally friendly dyeing of the bio-based polyvinyl alcohol collagen composite fiber or fabric.
[0060] Although the present application has been described in detail through preferred embodiments, the present application is not limited thereto. Various equivalent modifications or replacements can be made to the embodiments of the present application by those skilled in the art without departing from the spirit and essence of the present application, and these modifications or replacements shall be within the scope of the present application. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and these changes or replacements shall be within the protection scope of the present application.
Claims
1. A method for dyeing bio-based polyvinyl alcohol collagen composite fibers or fabrics thereof, characterized in that: The steps include: Step S1: preparing a reactive dyeing solution, and adding sodium sulfate to the reactive dyeing solution and stirring evenly; Step S2: Wetting and padding the bio-based polyvinyl alcohol collagen composite fiber or the fabric thereof, and then completely immersing it in an active dyeing solution for dyeing; Step S3: Wash the dyed bio-based polyvinyl alcohol collagen composite fiber or its fabric with cold water once, hot water twice, and cold water twice in sequence, and dry it after washing to obtain a dyed product.
2. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1, wherein: In step S1, the reactive dyeing solution is an aqueous solution of a reactive dye, and the amount of the reactive dye in the reactive dyeing solution is 1%-6% owf.
3. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1, characterized in that: In step S1, the amount of sodium sulfate added is 20-60 g / L.
4. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1, characterized in that: In step S2, the treatment liquid for wet padding is cold water; the rolling rate of the padding is 60%-65%, and the padding method is one dip and one roll.
5. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1, characterized in that: In step S2, the dyeing bath ratio is 1:50, the dyeing temperature is 48-52°C, the dyeing heating rate is 0.5-1.5°C / min, and the dyeing holding time is 25-35min.
6. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1, characterized in that: In step S3, the temperature of hot water washing is 48-52°C.
7. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1 or 6, characterized in that: In step S3, soaping agent is added in the second hot water wash, and the amount of soaping agent is 2-3 g / L.
8. The method for dyeing bio-based polyvinyl alcohol collagen composite fibers or fabrics thereof according to claim 7, characterized in that: The soaping agent is a secondary alkyl sulfonate.
9. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1, characterized in that: In step S3, the drying temperature is 88-90°C.
10. The method for dyeing a bio-based polyvinyl alcohol collagen composite fiber or a fabric thereof according to claim 1 or 4, characterized in that: The temperature of cold water is 23-27℃.