Fluorine-free single repellent and single absorbent finishing process of woven fabric

Abstract

The present application belongs to the technical field of textile, and particularly relates to a fluorine-free single-proofing and single-absorbing finishing process of woven fabric. The process comprises the following steps: pretreatment, dyeing / whitening, printing, baking, tentering, dry setting and preshrinking. The working solution of the printing step comprises the following raw materials: fluorine-free waterproofing agent, waterproofing crosslinking agent, thickening agent, anti-seepage agent and water. The dosing step of the working solution of the printing step is as follows: first, add the thickening agent, then add water and stir until uniform, and then add the anti-seepage agent, waterproofing agent and waterproofing crosslinking agent in sequence. The present application solves the problem that fluorine-free waterproofing agent is difficult to be used for single-proofing and single-absorbing of woven fabric, and the process is simple and eco-friendly.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to a fluorine-free single-absorption finishing process for woven fabrics. Background Technology

[0002] Currently, people are paying more and more attention to the functional aspects of clothing. Outdoor activities may suddenly encounter rain, requiring fabrics with a certain degree of water resistance to prevent getting wet. However, such fabrics only offer waterproofing but lack moisture-wicking properties. Therefore, there is an urgent need for a functional fabric with an inner moisture-wicking layer and an outer waterproof layer. Current one-way waterproof and one-way absorbent finished fabrics use fluorinated water-repellent agents. Due to the high bond energy of the CF bonds in fluorinated water-repellent agents, the surface free energy of textiles is significantly reduced, exhibiting superior water-repellent performance in one-way waterproof and one-way absorbent finishing. However, problems such as the physiological toxicity and environmental degradation of fluorinated water-repellent agents are gradually emerging. These fluorinated substances generally contain PFOA, PFOS, etc., which accumulate in the environment over a long period, resulting in poor environmental performance. More importantly, they have been proven to have carcinogenic and other negative effects and have been banned by the US Environmental Protection Agency (EPA).

[0003] Patent CN112709077B provides a method for finishing durable, flame-retardant, breathable, absorbent, and waterproof fabrics. This method involves hot-rolling the front side of an aramid or blended fabric, then coating the front side with a waterproof coating adhesive made from a polyacrylic acid thickener, toluene, water, a fluorine-free waterproofing agent with a hydrocarbon polymer structure, a capped isocyanate synergist, and a polyurethane associative thickening and leveling agent. Finally, a moisture-absorbing coating adhesive made from a polyacrylic acid thickener, toluene, water, a polyurethane hydrophilic finishing agent, and a polyurethane associative thickening and leveling agent is applied to the reverse side of the fabric. This technology has a complex process, uses numerous chemical additives, and employs a coating process for finishing. Therefore, the development of an environmentally friendly, green, healthy, and sustainable woven fluorine-free absorbent and waterproof fabric is urgently needed. Summary of the Invention

[0004] In view of the shortcomings of existing single-absorption and single-protection finishing technologies, such as the use of a large amount of fluorine-containing materials, which are harmful to the environment and difficult to apply to woven fabrics, the purpose of this invention is to provide a fluorine-free single-absorption and single-protection finishing process for woven fabrics, which is simple and environmentally friendly.

[0005] The fluorine-free single-absorbency finishing process for woven fabrics described in this invention includes the following steps:

[0006] Pretreatment → Dyeing / Whitening → Printing → Baking → Stretching → Dry Setting → Pre-shrinking;

[0007] in:

[0008] The working solution for the printing process comprises the following raw materials by mass fraction:

[0009]

[0010] The preparation steps of the working solution for the printing process are as follows: first add a thickener, then add water and stir evenly, and then add an anti-seepage agent, a fluorine-free waterproofing agent, and a waterproof crosslinking agent in sequence.

[0011] The printing process has the following characteristics: pattern coverage: 100%, mesh size: 125 / 150 mesh, machine speed: 40-50m / min, magnetic force: 40-50%, and magnetic rod: 8# / 10#.

[0012] The printing process includes a drying oven temperature of 130–140°C.

[0013] The baking process is as follows: baking room temperature 140-160℃, baking time 40-120s, air volume 70-80%.

[0014] The stretching process includes: functional additive HSD: 30-50 g / L, functional crosslinking agent KNITTEX 7636: 30-50 g / L, drying oven temperature 130-140℃, and baking time 24-40 s.

[0015] The dry setting process involves drying at a temperature of 150–160°C for 24–50 seconds.

[0016] The functional crosslinking agent is a reactive crosslinking agent containing inorganic magnesium salt based on modified dihydroxymethyldihydroxyethylene urea.

[0017] The functional additive is a compound emulsion of hydrophilic polymer and polysiloxane.

[0018] The waterproofing agent is a bio-based, fluorine-free waterproofing agent.

[0019] The pretreatment processes are singeing, descaling, oxygen bleaching, and mercerizing.

[0020] The pretreatment process consists of singeing, descaling, special bleaching, and drying with a wet cloth.

[0021] The dyeing process involves pad-drying and continuous dyeing for color fixation.

[0022] Continuous dyeing fixation can be either reduction continuous dyeing fixation or reactive continuous dyeing fixation.

[0023] (1a) Pretreatment of the fluorine-free single-absorption finishing process for the woven fabric, preferred option one:

[0024] Singeing: Flame intensity: 10-20 mbar, Singeing method: through burning / direct burning, Vehicle speed: 80-120 m / min;

[0025] Cold pile: NaOH: 30-50 g / L, H2O2: 9-15 g / L, MAG chelating agent: 15-18 g / L, pile time: 24 h;

[0026] Water washing and scouring: caustic soda (NaOH): 20-50 g / L, refining agent (CRC): 5-7 g / L, penetrant (ZFC): 6-8 g / L, chelating agent (SQ-A): 4-5 g / L, dewaxing agent (SA-U): 4-5 g / L, steaming oven temperature: 100℃, fabric stacking time: 10-25 min, machine speed: 50-70 m / min;

[0027] Mercerizing: Sodium hydroxide (NaOH): 160-300 g / L, concentrated alkali temperature: 50-55℃, dilute alkali zone temperature: 80-85℃, stable zone temperature: 85-90℃, machine speed: 70-80 m / min;

[0028] Dry setting: machine speed: 30~50m / min, drying room temperature: 180~200℃;

[0029] (1b) Pretreatment of the fluorine-free single-absorption finishing process for the woven fabric, preferred option two:

[0030] Singeing: Flame intensity: 20mbar, Singeing method: direct burning, Vehicle speed: 120m / min;

[0031] Desizing: Desizing enzyme OPT-280: 4g / L, penetrant MRZ: 5g / L, refining enzyme 601Lconc: 2g / L, extractant RED: 4g / L, steam oven temperature: 100℃, fabric stacking time: 15min, machine speed: 70m / min;

[0032] Boiling and simmering: Caustic soda: 20g / L, refining agent CRC: 6g / L, penetrant MRZ: 6g / L, chelating agent SQ-A: 4g / L, dewaxing agent SA-U: 5g / L, steaming oven temperature: 100℃, stacking time: 25min, machine speed: 70m / min;

[0033] Oxygen bleaching: NaOH: 1g / L, H2O2: 10g / L, SQ-A: 10g / L, WA-X: 6g / L, OUR-266: 7g / L, steam oven temperature: 100℃, fabric stacking time: 25min, machine speed: 60m / min.

[0034] (1c) Pretreatment of the fluorine-free single-absorption finishing process for the woven fabric, preferred option three:

[0035] Singeing: Flame intensity: 20mbar, Singeing method: through burning, Vehicle speed: 100m / min;

[0036] Cold pile: NaOH: 45g / L, H2O2: 13g / L, MAG chelating agent: 16g / L, pile time: 24h;

[0037] Water washing and scouring: caustic soda NaOH: 45g / L, refining agent CRC: 4g / L, penetrant ZFC: 6g / L, chelating agent SQ-A: 4g / L, dewaxing agent SA-U: 5g / L, steaming oven temperature: 100℃, stacking time: 25min, machine speed: 50m / min;

[0038] Mercerizing: NaOH: 219 g / L, concentrated alkali temperature: 50℃, dilute alkali zone temperature: 85℃, stable zone temperature: 90℃, machine speed: 70 m / min.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] (1) This invention provides a fluorine-free single-absorption and single-repellent finishing process for woven fabrics, which meets the requirements of environmental protection, green health and sustainable development.

[0041] (2) The selected fluorine-free waterproofing agent ZELAN R3 is made from non-fluorine, renewable raw materials extracted from plants. About 60% of its components are renewable resources, making it safe and environmentally friendly.

[0042] (3) The hydrophilic functional additive HSD used in this technology after printing and baking can effectively improve the hydrophilicity of the reverse side of the fabric and has little impact on the waterproofness of the front side of the fabric.

[0043] (4) This technology mainly relies on rotary screen printing machine to achieve single-sided treatment of fabric. The parameters such as mesh size, magnetic rod, magnetic force, and machine speed during printing are adjusted to control the penetration of the paste in the fabric, so that the paste only covers the surface of the fabric and achieves single-sided anti-absorption treatment of woven fabric.

[0044] (5) The fluorine-free single-absorption finishing process for woven fabrics of the present invention has simple steps, mild conditions, and is suitable for market promotion. Detailed Implementation

[0045] This invention provides a fluorine-free, single-absorbency-resistant finishing process for woven fabrics. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of this invention. The preparation method of this invention has been described through preferred embodiments. Those skilled in the art can obviously modify and appropriately change and combine the preparation method of this invention without departing from its content, spirit, and scope to realize and apply the technology of this invention. To further illustrate this invention, the following detailed description of the fluorine-free, single-absorbency-resistant finishing process for woven fabrics is provided in conjunction with embodiments.

[0046] The additives used in the following examples and comparative examples were all commercially available, as shown in Table 1.

[0047] Table 1 Reagents

[0048]

[0049]

[0050] Example 1

[0051] The fabric is made of cotton elastic with the following specifications: CM100 / 3*FFT20(105D)*146*70*55 / 56 and the fabric structure is 3 / 1Z.

[0052] The specific steps of the fluorine-free single-absorbency finishing process for the woven fabric are as follows:

[0053] Greige fabric → singeing → cold stacking → washing and scouring → mercerizing → dry setting → dyeing → printing → baking → stretching → dry setting → pre-shrinking;

[0054] in:

[0055] Singeing: Flame intensity: 16 mbar, Singeing method: direct burning, Vehicle speed: 100 m / min;

[0056] Cold pile: NaOH: 45g / L, H2O2: 13g / L, MAG chelating agent: 16g / L, pile time: 24h;

[0057] Water washing and scouring: caustic soda NaOH: 45g / L, refining agent CRC: 4g / L, penetrant ZFC: 6g / L, chelating agent SQ-A: 4g / L, dewaxing agent SA-U: 5g / L, steaming oven temperature: 100℃, stacking time: 25min, machine speed: 50m / min;

[0058] Mercerizing: NaOH (caustic soda): 256 g / L, concentrated alkali temperature: 50℃, dilute alkali zone temperature: 85℃, stable zone temperature: 90℃, machine speed: 70 m / min;

[0059] Dry setting: machine speed: 35m / min, drying oven temperature: 195℃;

[0060] Staining: Reduction staining was used; Staining prescription: B-RBS (FB) 5.6 g / L, Y.2G 3.5 g / L, R.FBB (YC): 2.5 g / L;

[0061] Printing: ZELAN R3 (fluorine-free waterproofing agent): 15%, EXTENDER SFB (waterproofing crosslinking agent): 1.5%, LAMBICOL L491 (thickening agent): 6%, FS-30 (anti-seepage agent): 1%. Add the thickening agent first, then softened water and stir until homogeneous. Add the anti-seepage agent, then the waterproofing agent, and finally the waterproofing crosslinking agent. Rotary screen mesh: 125 mesh; machine speed: 40 m / min; magnetic force: 50%; unit magnetic rod: 10#; drying room temperature: 140℃; pattern coverage: 100%. Baking: machine speed: 75 m / min; drying room temperature: 150℃; airflow: 70%; baking time: 120 s.

[0062] Stretching: Functional additive HSD: 50g / L, functional crosslinking agent KNITTEX 7636: 30g / L, drying oven temperature 140℃, baking time 36s;

[0063] Dry setting: Drying room temperature 160℃, drying time 40s.

[0064] Pre-shrinkage: Speed: 60m / min, Blanket temperature: 110℃, Rubber blanket temperature: 100℃, Tension: 0.3Bar, Roll gap: 10mm.

[0065] Example 2

[0066] The fabric is made of pure cotton, with a weave specification of CM60*CM60*210*124*58 / 59 and a weave structure of 4 / 1 satin.

[0067] The specific steps of the fluorine-free single-absorbency finishing process for the woven fabric are as follows:

[0068] Greige fabric → singeing → desizing → scouring → oxygen bleaching → dyeing → printing → baking → stretching → dry setting → pre-shrinking;

[0069] in:

[0070] Singeing: Flame intensity: 20mbar, Singeing method: direct burning, Vehicle speed: 120m / min;

[0071] Desizing: Desizing enzyme OPT-280: 4g / L, penetrant MRZ: 5g / L, refining enzyme 601-L: 2g / L, extractant RED: 4g / L, steam oven temperature: 100℃, fabric stacking time: 15min, machine speed: 70m / min;

[0072] Boiling and simmering: Caustic soda: 20g / L, refining agent CRC: 6g / L, penetrant MRZ: 6g / L, chelating agent SQ-A: 4g / L, dewaxing agent SA-U: 5g / L, steaming oven temperature: 100℃, stacking time: 25min, machine speed: 70m / min;

[0073] Oxygen bleaching: NaOH: 1g / L, H2O2: 10g / L, SQ-A: 10g / L, WA-X: 6g / L, OUR-266: 7g / L, steam oven temperature: 100℃, fabric stacking time: 25min, machine speed: 60m / min.

[0074] Staining: The active dispersion two-bath long car staining method was used; the staining formula was: R.BF-2B 0.048g / L, YellowCL-S 0.048g / L, BE-BR 0.71g / L;

[0075] Printing process: ZELAN R3 (fluorine-free waterproofing agent): 12%; EXTENDER SFB (waterproofing crosslinking agent): 1.2%; LAMBICOL L491 (thickening agent): 8%; FS-30 (anti-seepage agent): 1.5%. Add the thickening agent first, then add softened water and stir until homogeneous. Next, add the anti-seepage agent, then the waterproofing agent, and finally the waterproofing crosslinking agent. Rotary screen mesh: 150 mesh; printing speed: 40 m / min; magnetism: 50; magnetic rod: #8; drying oven temperature: 140℃; pattern coverage: 100%.

[0076] Baking: Vehicle speed: 70m / min, drying room temperature: 150℃, air volume: 70%; baking time: 120s;

[0077] Stretching: Functional additive HSD: 40g / L, functional crosslinking agent KNITTEX 7636: 40g / L, drying oven temperature 140℃, baking time 36s;

[0078] Dry setting: Drying room temperature 160℃, drying time 40s.

[0079] Pre-shrinkage: Speed: 60m / min, Blanket temperature: 110℃, Rubber blanket temperature: 100℃, Tension: 0.3Bar, Roll gap: 10mm.

[0080] Example 3

[0081] Fabric is pure cotton, weave specifications: CPT80 / 2*CPT80 / 2*150*115*59 / 60, weave structure: 2 / 2Z;

[0082] The specific steps of the fluorine-free single-absorbency finishing process for the woven fabric are as follows:

[0083] Greige fabric → singeing → cold stacking → washing and scouring → mercerizing → dyeing → printing → baking → stretching → dry setting → pre-shrinking;

[0084] in:

[0085] Singeing: Flame intensity: 20mbar, Singeing method: through burning, Vehicle speed: 100m / min;

[0086] Cold pile: NaOH: 45g / L, H2O2: 13g / L, MAG chelating agent: 16g / L, pile time: 24h;

[0087] Water washing and scouring: caustic soda NaOH: 45g / L, refining agent CRC: 4g / L, penetrant ZFC: 6g / L, chelating agent SQ-A: 4g / L, dewaxing agent SA-U: 5g / L, steaming oven temperature: 100℃, stacking time: 25min, machine speed: 50m / min;

[0088] Mercerizing: NaOH (caustic soda): 219 g / L, concentrated alkali temperature: 50℃, dilute alkali zone temperature: 85℃, stable zone temperature: 90℃, machine speed: 70 m / min;

[0089] Staining: Cold staining was used; the staining formula was: OC-3R 6.7g / L, R.BF-2B 1.3g / L;

[0090] Printing process: ZELAN R3 (fluorine-free waterproofing agent): 15%; EXTENDER SFB (waterproof crosslinking agent): 1.5%; LAMBICOL L491 (thickening agent): 8%; FS-30 (anti-seepage agent): 1%. Add the thickening agent first, then softened water and stir until homogeneous. Add the anti-seepage agent, then the waterproofing agent, and finally the waterproof crosslinking agent. Rotary screen mesh: 125 mesh; printing speed: 40 m / min; magnetism: 50; magnetic rod: #8; drying oven temperature: 140℃; pattern coverage: 100%.

[0091] Baking: Vehicle speed: 70m / min, drying room temperature: 150℃, air volume: 70%; baking time: 120s;

[0092] Stretching: Functional additive HSD: 50g / L, functional crosslinking agent KNITTEX 7636: 30g / L, drying oven temperature 140℃, baking time 36s;

[0093] Dry setting: Drying room temperature 160℃, drying time 40s.

[0094] Pre-shrinkage: Speed: 60m / min, Blanket temperature: 110℃, Rubber blanket temperature: 100℃, Tension: 0.3Bar, Roll gap: 8mm.

[0095] Comparative Example 1

[0096] Similar to Example 1, the fluorine-free waterproofing agent ZELAN R3 in the printing process was replaced with the fluorine-free waterproofing agent WELGUARD WR-7000 to obtain the finished product.

[0097] Comparative Example 2

[0098] Similar to Example 2, the magnetic rod in the printing process was changed from #8 to #12 to obtain the finished product.

[0099] Comparative Example 3

[0100] Similar to Example 3, the functional additive HSD in the tenter frame process was replaced with MAS to obtain the finished product.

[0101] The finished products prepared in the above examples and comparative examples were tested for the front waterproofness and reverse water absorption of the fabrics. The testing standards were AATCC 22-2014 and AATCC 79-2010, respectively. The test results are shown in the table below.

[0102] Table 2 Detection Results

[0103]

[0104] As can be seen from the above experiments and tables, in Comparative Example 1, changing the fluorine-free waterproofing agent from R3 to WR-7000 resulted in poor compatibility between WR-7000 and the subsequent stretching agent HSD:50 and KNITTEX 7636, affecting the performance of the waterproofing agent and thus reducing the fabric's waterproofness. In Comparative Example 2, changing the magnetic rod during printing from #8 to #12 caused the waterproofing agent to penetrate to the other side of the fabric, resulting in back seepage and reduced absorbency on the hydrophilic side of the fabric. In Comparative Example 3, replacing the functional agent HSD in the stretching process with the absorbent softener MAS significantly affected the performance of the fluorine-free waterproofing agent, causing a decrease in the fabric's waterproofness. Therefore, the woven single-sided waterproof and absorbent fabric produced using the fluorine-free single-sided waterproofing and absorbent finishing process of this invention has better front waterproofing and back hydrophilicity than fabrics treated with the same method without this technology, exhibiting stronger wash resistance and longer-lasting effects.

Claims

1. A fluorine-free, single-absorbency finishing process for woven fabrics, characterized in that, The process includes the following steps: Pretreatment → Dyeing / Whitening → Printing → Baking → Stretching → Dry Setting → Pre-shrinking; in: The working solution for the printing process comprises the following raw materials by mass fraction: Bio-based fluorine-free waterproofing agent ZELANR3: 10~15%; Waterproof crosslinking agent 1~1.5%; Thickener 6-8%; Water balance; The printing process is as follows: pattern coverage: 100%, mesh size: 125 mesh or 150 mesh, machine speed: 40~50m / min, magnetic force: 40~50%, magnetic rod: 8# / 10#. The stretching process includes: functional additives: 30~50g / L, functional crosslinking agent: 30~50g / L, drying oven temperature: 130~140℃, and baking time: 24~40s. The functional crosslinking agent is KNITTEX 7636, a reactive crosslinking agent containing inorganic magnesium salt based on modified dihydroxymethyldihydroxyvinyl urea. The functional additive is a compound emulsion HSD of hydrophilic polymer and polysiloxane.

2. The fluorine-free single-absorbency finishing process for woven fabrics according to claim 1, characterized in that, The preparation steps of the working solution for the printing process are as follows: first add a thickener, then add water and stir evenly, and then add an anti-seepage agent, a fluorine-free waterproofing agent, and a waterproof crosslinking agent in sequence.

3. The fluorine-free single-absorbency finishing process for woven fabrics according to claim 1, characterized in that, The printing process includes a drying oven temperature of 130~140℃.

4. The fluorine-free single-absorbency finishing process for woven fabrics according to claim 1, characterized in that, The baking process is as follows: oven temperature 140~160℃, baking time 40~120s, air volume 70~80%.

5. The fluorine-free single-absorbency finishing process for woven fabrics according to claim 1, characterized in that, The dry setting process involves drying at a temperature of 150-160℃ for 24-50 seconds.

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