Pretreatment process for improving hand feeling and fastness of pigment printed fabric

Abstract

The invention provides a pretreatment process for improving hand feeling and fastness of a pigment printed fabric. The hand feeling and fastness of the pigment printing fabric can be remarkably improved by combining enzyme desizing with a specific type of pretreatment liquid. Starch in fabric slurry can be decomposed into short-chain dextrin and oligosaccharide by adopting enzyme desizing, so that the short-chain dextrin and oligosaccharide can be easily removed in the washing process to achieve a better desizing effect, the permeability of the fabric is improved, the pretreatment liquid can better permeate into fibers, and a better printing effect is achieved.

Description

Technical Field

[0001] This invention belongs to the field of printing technology, specifically relating to a pretreatment process for improving the hand feel and fastness of pigment-printed fabrics. Background Technology

[0002] Traditional reactive printing and disperse printing processes require washing, soaping, or reduction cleaning to remove unfixed dyes, thickeners, and other auxiliaries, giving the fabric a good hand feel and color fastness. However, these processes consume a lot of water, generate a large amount of wastewater, and consume a lot of energy. With increasing environmental pressure, printing and dyeing enterprises are facing even greater pressure.

[0003] Pigment printing technology has gained increasing market share due to its advantages such as wide applicability to various textiles, short process flow, no need for washing, low energy consumption, and minimal wastewater discharge. Furthermore, the emergence of bio-active pigment printing adhesives in recent years has further boosted its popularity among printing and dyeing companies. However, the hand feel and durability of pigment-printed fabrics are often unsatisfactory, limiting their further development.

[0004] Therefore, providing a pretreatment process to improve the hand feel and fastness of pigment-printed fabrics has become a problem that needs to be solved. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a pretreatment process for improving the hand feel and fastness of pigment-printed fabrics. The pretreatment process for pigment-printed fabrics provided by the present invention can significantly improve the hand feel and fastness of pigment-printed fabrics.

[0006] This invention provides a pretreatment process for improving the hand feel and fastness of pigment-printed fabrics, comprising the following steps:

[0007] The greige fabric is sequentially singed, enzymatically desized, alkali-scoured, bleached, and stretched to obtain a semi-finished fabric.

[0008] The pretreatment solution for tensioning and weft straightening includes:

[0009] 10-30 g / L of cationic modifier, 0.25-0.35 g / L of penetrant, 0.25-0.35 g / L of chelating dispersant, and 10-30 g / L of citric acid.

[0010] Preferably, the cationic modifier in the pretreatment solution for stretching and straightening includes a cationic quaternary ammonium salt polymer;

[0011] The penetrant is selected from fatty alcohol polyoxyethylene ether (AEO), and preferably penetrant JFC;

[0012] The chelating dispersant is selected from inorganic polyphosphate chelating dispersants.

[0013] Preferably, the singeing temperature is 92~98℃ and the vehicle speed is 110±5 meters / minute.

[0014] Preferably, the desizing solution used for enzyme desizing includes:

[0015] 5-10 g / L of desizing enzyme; 0.3-1.5 g / L of permeabilizer.

[0016] Preferably, the desizing enzyme is selected from amylase; the penetrant is selected from fatty alcohol polyoxyethylene ether.

[0017] Preferably, the alkaline boiling solution comprises:

[0018] 20-25 g / L sodium hydroxide, 0.25-0.35 g / L penetrant, and 0.25-0.35 g / L chelating dispersant.

[0019] Preferably, the penetrant is selected from fatty alcohol polyoxyethylene ether;

[0020] The chelating dispersant is selected from at least one of inorganic polyphosphates, organic phosphates, aminocarboxylic acids, hydroxycarboxylic acids, and polyacrylic acid chelating dispersants.

[0021] Preferably, the alkaline boiling temperature is 95-100℃ and the time is 55-65 minutes.

[0022] Preferably, the bleaching solution used for bleaching includes:

[0023] 8-12 g / L hydrogen peroxide, 1.5-3 g / L caustic soda flakes, 0.25-0.35 g / L penetrant, and 0.25-0.35 g / L chelating dispersant.

[0024] Preferably, the penetrant is selected from fatty alcohol polyoxyethylene ether;

[0025] The chelating dispersant is selected from at least one of inorganic polyphosphates, organic phosphates, aminocarboxylic acids, hydroxycarboxylic acids, and polyacrylic acid chelating dispersants.

[0026] Compared with existing technologies, this invention provides a pretreatment process to improve the hand feel and fastness of pigment-printed fabrics, comprising the following steps: sequentially subjecting the greige fabric to singeing, enzymatic desizing, alkaline scouring, bleaching, and stretching / weft straightening to obtain a semi-finished fabric; the pretreatment solution for stretching / weft straightening comprises: 10-30 g / L of cationic modifier, 0.25-0.35 g / L of penetrant, 0.25-0.35 g / L of chelating dispersant, and 10-30 g / L of citric acid. This invention, through enzymatic desizing combined with a specific type of pretreatment solution, can significantly improve the hand feel and fastness of pigment-printed fabrics. The enzymatic desizing process decomposes the starch in the fabric sizing into short-chain dextrins and oligosaccharides, making them easily removed during the washing process, achieving a better desizing effect, improving the fabric's permeability, and allowing the pretreatment solution to better penetrate the fibers, resulting in better printing effects. Furthermore, compared to traditional alkaline desizing, fabrics treated with enzymatic desizing have a softer hand feel. The pretreatment solution of this invention includes cationic additives, making the treated semi-finished product cationic. When the anionic pigment printing paste is applied to the fabric surface, the positive charge on the fabric surface attracts the negative charge of the pigment, preventing the negatively charged pigment from penetrating to the back of the fabric and improving the color depth on the front. At the same time, the pretreatment solution includes citric acid, so that the treated semi-finished fabric surface contains citric acid, which is beneficial to the cross-linking reaction of the pigment printing adhesive, enhancing the film fastness of the adhesive. The dry rubbing fastness of the printed fabric is improved from grade 3-4 to grade 4; the wet rubbing fastness is improved from grade 3 to grade 3-4, and the amount of adhesive used can be reduced, the fabric hand feel can be improved, and the amount of chemical hand feel finishing agents can be reduced. Detailed Implementation

[0027] This invention provides a pretreatment process for improving the hand feel and fastness of pigment-printed fabrics, comprising the following steps:

[0028] The greige fabric is sequentially singed, enzymatically desized, alkali-scoured, bleached, and stretched to obtain a semi-finished fabric.

[0029] The pretreatment solution for tensioning and weft straightening includes:

[0030] 10-30 g / L of cationic modifier, 0.25-0.35 g / L of penetrant, 0.25-0.35 g / L of chelating dispersant, and 10-30 g / L of citric acid.

[0031] The greige fabric selected for this invention can be made of cellulose fibers such as pure cotton, polyester-cotton blends, Tencel, and Modal. There are no special restrictions on the specifications of the greige fabric; conventional fabric specifications in the art are acceptable, such as: C24×2472×60 (both warp and weft yarns are 24-count yarns, warp density is 72 threads / 10cm, weft density is 60 threads / 10cm); C40×40; 133×72; C60×TS40 180×116 (warp yarns are 60-count pure cotton yarns, warp density is 180 threads / 10cm, weft yarns are 40-count Tencel yarns, weft density is 116 threads / 10cm).

[0032] In this invention, the fabric is first singed, wherein the singeing temperature is 92~98℃, and can be any value between 92, 94, 95, 96, 98℃. The machine speed is 110±5 m / min, the rolling pressure is 0.3±0.02 MPa, and the J-box temperature is set to 100℃.

[0033] Next, the singed fabric is subjected to enzymatic desizing, wherein the desizing solution used for enzymatic desizing includes:

[0034] 5-10 g / L of desizing enzyme; 0.3-1.5 g / L of permeabilizer.

[0035] The desizing solution contains 5-10 g / L of desizing enzyme, which can be any value between 5, 6, 7, 8, 9, 10, or 5-10 g / L. The desizing enzyme is selected from amylases, and more preferably α-amylase or a wide-temperature-range amylase. The desizing enzyme can decompose the starch in the fabric sizing into short-chain dextrins and oligosaccharides, making them easily removed during the washing process and achieving a good desizing effect.

[0036] The desizing solution also includes 0.3-1.5 g / L of a penetrant, which can be any value between 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, or 0.3-1.5 g / L. The penetrant is selected from fatty alcohol polyoxyethylene ether (AEO).

[0037] During enzymatic desizing, the dry-feed fabric is dipped and rubbed twice with the desizing solution at a 1:20 liquor ratio. This is followed by cold piling, with the temperature ranging from 20 to 50°C (any value between 20, 30, 40, 50, or 20-50°C) for 3 to 8 hours (any value between 3, 4, 5, 6, 7, 8, or 3-8 hours). After cold piling, the fabric undergoes one hot water wash, two cold water washes, and then drying. The preferred hot water temperature is 70-80°C.

[0038] Then, alkaline boiling is performed, wherein the alkaline boiling solution comprises:

[0039] 20-25 g / L sodium hydroxide, 0.25-0.35 g / L penetrant, and 0.25-0.35 g / L chelating dispersant.

[0040] Specifically, the boiling solution includes 20-25 g / L of sodium hydroxide, which can be any value between 20, 21, 22, 23, 24, 25, or 20-25 g / L.

[0041] The boiling solution also includes 0.25-0.35 g / L of a penetrant, which can be any value between 0.25, 0.27, 0.30, 0.32, 0.34, 0.35, or 0.25-0.35 g / L. The penetrant is selected from fatty alcohol polyoxyethylene ether (AEO).

[0042] The boiling solution further includes 0.25-0.35 g / L of a chelating dispersant, which can be any value between 0.25, 0.27, 0.30, 0.32, 0.34, 0.35, or 0.25-0.35 g / L. In this invention, the chelating dispersant is also known as a complexing agent, a metal ion blocking agent, or a water softener. The chelating dispersant is selected from at least one of inorganic polyphosphates, organic phosphates, aminocarboxylates, hydroxycarboxylates, and polyacrylic acid chelating dispersants. The inorganic polyphosphates are selected from at least one of sodium tripolyphosphate, sodium pyrophosphate, and sodium hexametaphosphate; the organic phosphates are selected from at least one of sodium ethylenediaminetetramethylene phosphate (EDTMPS), diethylenetriaminepentamethylene phosphate (DETPMPS), and aminetrimethylene phosphate; the aminocarboxylic acids are selected from at least one of sodium aminotriacetate (NTA), ethylenediaminetetraacetate (disodium or tetrasodium EDTA), and diethylenetriaminepentacarboxylic acid (DTPA); the hydroxycarboxylic acids are selected from at least one of tartaric acid, heptahydrate, sodium gluconate, and sodium alginate; and the polyacrylic acids are selected from at least one of hydrolyzed polymaleic anhydride (HPMA), polyacrylic acid (PAA), polyhydroxyacrylic acid, maleic acid-acrylic acid copolymer, and polyacrylamide.

[0043] The alkaline boiling temperature is 95-100℃, which can be any value between 95, 96, 97, 98, 99, 100℃, or 95-100℃, and the time is 55-65min, which can be any value between 55, 60, 65, or 55-65min.

[0044] Then a bleaching process is performed, wherein the bleaching solution used for bleaching includes:

[0045] 8-12 g / L hydrogen peroxide, 1.5-3 g / L caustic soda flakes, 0.25-0.35 g / L penetrant, and 0.25-0.35 g / L chelating dispersant.

[0046] The bleaching solution comprises 8-12 g / L of hydrogen peroxide, which can be 8, 9, 10, 11, 12, or any value between 8 and 12 g / L.

[0047] The bleaching solution also includes 1.5-3 g / L of caustic soda flakes, which can be any value between 1.5, 2, 2.5, 3, or 1.5-3 g / L.

[0048] The bleaching solution also includes 0.25-0.35 g / L of a penetrant, which can be any value between 0.25, 0.27, 0.30, 0.32, 0.34, 0.35, or 0.25-0.35 g / L. The penetrant is selected from fatty alcohol polyoxyethylene ether (AEO).

[0049] The bleaching solution also includes 0.25-0.35 g / L of chelating dispersant, which can be any value between 0.25, 0.27, 0.30, 0.32, 0.34, 0.35, or 0.25-0.35 g / L.

[0050] The chelating dispersant is selected from at least one of inorganic polyphosphates, organic phosphates, aminocarboxylates, hydroxycarboxylates, and polyacrylic acid chelating dispersants. Specifically, the inorganic polyphosphates are selected from at least one of sodium tripolyphosphate, sodium pyrophosphate, and sodium hexametaphosphate; the organic phosphates are selected from at least one of sodium ethylenediaminetetramethylene phosphate (EDTMPS), diethylenetriaminepentamethylene phosphate (DETPMPS), and aminetrimethylene phosphate; the aminocarboxylates are selected from at least one of sodium aminotriacetate (NTA), ethylenediaminetetraacetate (disodium or tetrasodium EDTA), and diethylenetriaminepentacarboxylate (DTPA); the hydroxycarboxylates are selected from at least one of tartaric acid, heptaphosphate, sodium gluconate, and sodium alginate; and the polyacrylic acid is selected from at least one of hydrolyzed polymaleic anhydride (HPMA), polyacrylic acid (PAA), polyhydroxyacrylic acid, maleic acid-acrylic acid copolymer, and polyacrylamide.

[0051] After bleaching, the fabric undergoes stretching and weft straightening. The pretreatment solution for stretching and weft straightening includes:

[0052] 10-30 g / L of cationic modifier, 0.25-0.35 g / L of penetrant, 0.25-0.35 g / L of chelating dispersant, and 10-30 g / L of citric acid.

[0053] The pretreatment solution includes 10-30 g / L of a cationic modifier, which can be 10, 15, 20, 25, 30, or any value between 10-30 g / L. The main component of the cationic modifier includes a cationic quaternary ammonium salt polymer, preferably at least one of polyacrylamide (PAM), dimethyl diallyl ammonium chloride polymer, and octadecyl dimethyl benzyl ammonium chloride.

[0054] The pretreatment solution further includes 0.25-0.35 g / L of a penetrant, which can be any value between 0.25, 0.27, 0.30, 0.32, 0.34, 0.35, or 0.25-0.35 g / L. The penetrant is selected from fatty alcohol polyoxyethylene ether (AEO), preferably penetrant JFC.

[0055] The pretreatment solution further includes 0.25-0.35 g / L of a chelating dispersant, which can be any value between 0.25, 0.27, 0.30, 0.32, 0.34, 0.35, or 0.25-0.35 g / L. The chelating dispersant is selected from inorganic polyphosphate chelating dispersants; preferably, the inorganic polyphosphate is selected from at least one of sodium tripolyphosphate, sodium pyrophosphate, and sodium hexametaphosphate.

[0056] The pretreatment solution also includes 10-30 g / L of citric acid, which can be any value between 10, 15, 20, 25, 30, or 10-30 g / L.

[0057] The fabric blanks are placed in the tenter frame's rolling trough, with a rolling allowance of 65-70%. The temperature settings for each section of the tenter frame's drying chambers are shown in Table 1. The drying chambers of the tenter frame are numbered sequentially as follows: rolling trough - 1# - 2# - 3# - 4# - 5# - 6# - 7# - 8# - fabric drop rack. The tenter frame speed is set to 55-60 meters per minute, and the speed is matched with the drying chamber temperature.

[0058] Table 1 Temperature settings for drying chambers of each section of the stretching frame

[0059]

[0060] This invention also provides a printing method:

[0061] The semi-finished fabric obtained above is then subjected to coating printing followed by baking. Prior to coating printing, a color paste is prepared, comprising:

[0062] 2-5% thickener, 5-20% binder, 0.5-3% coating.

[0063] The color paste includes 2-5% thickener, which can be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or any value between 2-5%. The thickener is selected from acrylate thickeners or polyurethane thickeners, and more preferably from thickener LY-8100 (Zhejiang Liansheng New Material Co., Ltd., industrial grade, acrylate) or HIT (BASF Applied Chemicals Co., Ltd., Shanghai, China, industrial grade, acrylate), also known as Thickerner HIT Plus.

[0064] The color paste also includes 5-20% binder, which can be 5%, 7%, 10%, 12%, 15%, 17%, 20%, or any value between 5-20%. Compared with existing technologies, the amount of binder used in this invention is significantly reduced to achieve the same color depth and fastness level. The binder is selected from reactive printing adhesive 8602, HF-9 (Zhejiang Liansheng New Material Co., Ltd., industrial grade, acrylic ester), and flexible adhesive DM-5129 (Guangdong Demei Fine Chemical Group Co., Ltd., industrial grade, acrylic ester).

[0065] The color paste also includes 0.5-3% of coating material, which can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, or any value between 0.5-3%. The color paste is mainly an azo pigment dispersed in propylene glycol and water. Preferably, it is a coating color paste provided by Shanghai Laoan Coatings Co., Ltd., such as A014 Scarlet, 8204 Yellow, A303 Blue, etc.; TM Black from Anggao Chemical (China) Co., Ltd.; and RN Red from DyStar Group.

[0066] In this invention, the viscosity of the pigment is 30,000-50,000 mPa·s, and can be any value between 30,000, 35,000, 40,000, 45,000, 50,000, or 30,000-50,000 mPa·s.

[0067] During printing, the baking temperature is 160~170℃, which can be any value between 160, 165, 170, or 160~170℃, and the time is 1~2min, which can be any value between 1, 1.5, 2, or 1~2min.

[0068] The present invention has the following beneficial effects:

[0069] 1. The process of this invention does not include mercerizing, because the smooth fibers after mercerizing are not conducive to the adhesion of adhesives, which affects the friction strength of the fabric. In addition, the semi-finished product after mercerizing has a stiff feel, which is not conducive to the production of a soft feel.

[0070] 2. The present invention uses enzymatic desizing, which is beneficial for the biochemical treatment of wastewater. The wastewater can be collected separately, has high biodegradability, and is treated by bacteria. Compared with traditional alkaline desizing, the alkalinity is low, which reduces the amount of acid used during neutralization and the amount of salt generated during neutralization, reduces the burden on terminal membrane treatment, and reduces the difficulty of wastewater treatment, which is in line with the concept of green environmental protection.

[0071] 3. The pretreatment solution includes cationic additives, making the semi-finished product cationic. When the anionic pigment printing paste is applied to the fabric surface, the positive charge on the fabric surface attracts the negative charge of the pigment, preventing the negatively charged pigment from penetrating to the back of the fabric and increasing the color depth on the front side.

[0072] 4. The pretreatment solution contains citric acid, which makes the surface of the semi-finished fabric contain citric acid, which is conducive to the cross-linking reaction of the pigment printing adhesive, and enhances the film fastness of the adhesive. The dry rubbing fastness of the printed fabric is improved from grade 3-4 to grade 4, and the wet rubbing fastness is improved from grade 3 to grade 3-4. This can reduce the amount of adhesive used, improve the fabric hand feel, and reduce the amount of chemical hand feel finishing agents used.

[0073] Following the pretreatment process provided by this invention and then combining it with printing, this invention yields a coating-printed fabric with a soft hand feel and good fastness.

[0074] This invention does not include a mercerizing step, reduces the change in surface roughness of cotton fibers, increases the friction fastness of printed fabrics, reduces the amount of adhesive used, improves the hand feel of the fabric, and reduces the amount of finishing chemical hand feel agents used. This process is green, environmentally friendly and low-carbon.

[0075] To further understand the present invention, the pretreatment process for improving the hand feel and fastness of coated printed fabrics provided by the present invention will be described below with reference to embodiments. The scope of protection of the present invention is not limited to the following embodiments.

[0076] Example 1

[0077] The C28*28 greige fabric undergoes the following pretreatment process:

[0078] (1) Singeing (speed 110 m / min, temperature 95℃);

[0079] (2) Enzymatic desizing (desizing enzyme (heat-resistant α-amylase) 8 g / L, penetrant AEO 0.5 g / L, cold stacking at 30℃ for 4 h);

[0080] (3) Alkali boiling (sodium hydroxide 20g / L, penetrant AEO 0.3g / L, chelating dispersant 0.3g / L; 98℃, 60 minutes); the chelating dispersant is sodium hexametaphosphate (Yuyue Home Textiles Co., Ltd., industrial grade).

[0081] (4) Bleaching (hydrogen peroxide 10g / L, caustic soda 2g / L, penetrant AEO 0.3g / L, chelating dispersant 0.3g / L; 105℃, 60min) - washing with water - drying (105℃);

[0082] (5) Tensioning and straightening (25 g / L cationic modifier, 0.3 g / L AEO penetrant, 0.3 g / L chelating dispersant, 20 g / L citric acid; 160℃) yields a semi-finished fabric. The cationic modifier is T24-C (Shanghai Yayun New Materials Co., Ltd., industrial grade), whose main component is a polyamine-type polymer; the chelating dispersant is sodium hexametaphosphate (Yuyue Home Textiles Co., Ltd., industrial grade).

[0083] The desizing grade test result was 8, and the whiteness was 73.

[0084] Example 2

[0085] The C28*28 greige fabric undergoes the following pretreatment process:

[0086] Based on Example 1, with other parameters remaining unchanged, only the amount of desizing enzyme was changed to 9 g / L.

[0087] The desizing grade test result was 8, and the whiteness was 73.

[0088] As can be seen from Examples 1 and 2, increasing the amount of desizing enzyme from 8 to 9 g / L will result in cleaner desizing, reduced impurities on the fabric surface, and improved hand feel of the semi-finished product. After printing with pigments, the adhesive will bond more firmly to the fabric surface, improving friction fastness and hand feel.

[0089] Example 3

[0090] Based on Example 1, other parameters remain unchanged, except that the cold stack time is changed to 4.5h.

[0091] The desizing grade test result was 8, and the whiteness was 73.

[0092] As can be seen from Examples 1 and 3, extending the cold-batch time results in cleaner desizing, fewer impurities on the fabric surface, and improved hand feel of the semi-finished product. After printing with pigments, the adhesive bonds more firmly to the fabric surface, improving friction fastness and hand feel.

[0093] Comparative Example 1

[0094] C28*28 grey fabric undergoes a traditional alkali desizing pretreatment process:

[0095] (1) Singeing (speed 110±5 m / min, temperature 95±3℃).

[0096] (2) Desizing (caustic soda 40g / L, desizing agent 8g / L, penetrant 5g / L, sodium hexametaphosphate 0.4g / L; 50℃);

[0097] (3) Alkali boiling (sodium hydroxide 40g / L, penetrant DT-ST 0.3g / L, sodium hexametaphosphate 0.3g / L, 95℃, 60 minutes);

[0098] (4) Bleaching (hydrogen peroxide 10g / L, caustic soda 2g / L, penetrant 0.3g / L, sodium hexametaphosphate 0.3g / L, 100-115℃, 60min) - washing with water - drying (105±5℃).

[0099] (5) Tensioning and straightening (25 g / L cationic modifier, 0.3 g / L penetrant, 0.3 g / L sodium hexametaphosphate, 20 g / L citric acid; 160℃) to obtain semi-finished fabric.

[0100] In steps (2), (3), (4) and (5) above, the chelating dispersant is sodium hexametaphosphate (Shandong Yellow River Delta Textile Technology Co., Ltd.), the penetrant is DT-ST (Shandong Yellow River Delta Textile Technology Research Institute Co., Ltd.), the cationic modifier is HF-1 (Zhejiang Liansheng New Material Co., Ltd., industrial grade), and the polymer is a polyamine cationic polymer.

[0101] The desizing grade test result was 8, and the whiteness was 73.10.

[0102] Comparative Example 2

[0103] Based on Example 1, other parameters remain unchanged, except that the cationic modifier is 30 g / L and citric acid is replaced with 65 acid.

[0104] The semi-finished fabric was tested and found to be grade 8 in desizing and 73 in whiteness.

[0105] Setting the cationic modifier dosage to 30 g / L will increase the color depth and the K / S value. The coating printing process and technology are the same as in Example 1. The test results after printing are shown in the table. The K / S value will increase after printing.

[0106] Test case

[0107] The pigment paste formulation was prepared according to Table 2. Printing was performed using a small-scale printing machine, followed by drying at 105℃ and baking at 165℃ for 1 minute and 40 seconds. Fabric properties were then tested.

[0108] Table 2 Test Data of Coated Printed Fabrics

[0109]

[0110] In Table 2, the thickener is Thickener 8100, and the binder is Binder 8602 (Zhejiang Liansheng New Material Co., Ltd., industrial grade), both being acrylate-based. Products with a softness rating of ★★ or lower are considered substandard.

[0111] Examples 4-6 use the semi-finished fabric from Example 1, with the other processes being the same. The only difference is the amount of adhesive used.

[0112] Comparative Example 3 uses the same semi-finished fabric as Comparative Example 1, with all other processes being the same. The only difference is the amount of adhesive used.

[0113] Comparative Example 4 uses the same semi-finished fabric as Comparative Example 2, with all other processes being the same. The only difference is the amount of adhesive used.

[0114] Comparative Example 5 uses the semi-finished fabric from Example 1, with all other processes being the same except for the amount of adhesive used.

[0115] As can be seen from the data of Example 4 and the comparative example, the fastness index of dry sanding grade 4 and wet sanding grade 3 was achieved with a coating dosage of 3%. However, the softness of the hand feel of the comparative example did not meet the standard and was a substandard product. Example 5 used 2% less adhesive than Example 4, which improved the hand feel of the fabric. Continuing to increase the amount of adhesive did not have much effect on improving the fastness, but instead increased the cost and reduced the softness of the hand feel.

[0116] Color fastness to dry and wet rubbing: Tested according to GB / T 3920-2008 "Textiles - Tests for Color Fastness to Rubbing". Hand feel rating adopts a subjective evaluation method: relying on human sensory experience, evaluating the hand feel of the fabric through touch, observation, etc. Evaluators usually score or describe various aspects of the hand feel based on their own experience and feelings. For example, they can evaluate whether the fabric is soft, elastic, or smooth. The advantage of this method is its simplicity and ease of implementation, requiring no complex equipment. In this case, five laboratory testers blindly evaluated the treated fabric samples, writing down their softness rating levels. In the table above, five stars represent the softest, and one star represents the worst, with softness decreasing from five to one. Therefore, the ranking is as follows: adhesive dosage 16%~22%, but 16% results in poor fastness; when the adhesive dosage is 18%, the fastness and hand feel reach a balance. All meet the customer's needs. Compared with the conventional experience process of 3% coating and 20% adhesive, the new process in this paper reduces the amount of adhesive used by 10%.

(20%-18%)

[0117] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pretreatment process for improving the hand feel and fastness of pigment-printed fabrics, characterized in that, Includes the following steps: The greige fabric is sequentially singed, enzymatically desized, alkali-scoured, bleached, and stretched to obtain a semi-finished fabric. The pretreatment solution for tensioning and weft straightening includes: 10-30 g / L of cationic modifier, 0.25-0.35 g / L of penetrant, 0.25-0.35 g / L of chelating dispersant, and 10-30 g / L of citric acid.

2. The pretreatment process according to claim 1, characterized in that, The pretreatment solution for stretching and straightening includes a cationic modifier comprising a cationic quaternary ammonium salt polymer. The penetrant is selected from fatty alcohol polyoxyethylene ether (AEO), and preferably penetrant JFC; The chelating dispersant is selected from inorganic polyphosphate chelating dispersants.

3. The pretreatment process according to claim 1, characterized in that, The singeing temperature is 92~98℃, and the vehicle speed is 110±5 meters / minute.

4. The pretreatment process according to claim 1, characterized in that, The desizing solution used for enzyme desizing includes: 5-10 g / L of desizing enzyme; 0.3-1.5 g / L of permeabilizer.

5. The pretreatment process according to claim 4, characterized in that, The desizing enzyme is selected from amylase; the penetrant is selected from fatty alcohol polyoxyethylene ether.

6. The pretreatment process according to claim 1, characterized in that, The alkaline boiling solution includes: 20-25 g / L sodium hydroxide, 0.25-0.35 g / L penetrant, and 0.25-0.35 g / L chelating dispersant.

7. The pretreatment process according to claim 6, characterized in that, The penetrant is selected from fatty alcohol polyoxyethylene ether; The chelating dispersant is selected from at least one of inorganic polyphosphates, organic phosphates, aminocarboxylic acids, hydroxycarboxylic acids, and polyacrylic acid chelating dispersants.

8. The pretreatment process according to claim 1, characterized in that, The alkaline boiling temperature is 95-100℃, and the time is 55-65 minutes.

9. The pretreatment process according to claim 1, characterized in that, The bleaching solution used for bleaching includes: 8-12 g / L hydrogen peroxide, 1.5-3 g / L caustic soda flakes, 0.25-0.35 g / L penetrant, and 0.25-0.35 g / L chelating dispersant.

10. The pretreatment process according to claim 7, characterized in that, The penetrant is selected from fatty alcohol polyoxyethylene ether; The chelating dispersant is selected from at least one of inorganic polyphosphates, organic phosphates, aminocarboxylic acids, hydroxycarboxylic acids, and polyacrylic acid chelating dispersants.

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