Preparation method of chinlon 66 / cotton blended printed fabric

Abstract

The invention discloses a preparation method of a chinlon 66 / cotton blended printed fabric. The preparation method of the chinlon 66 / cotton blended printed fabric comprises the following steps: 1) pretreating the fabric by adopting a desizing-scouring-bleaching one-bath method, and performing high-temperature pre-shaping; (2) printing the fabric treated in the step (1); wherein the printing paste for printing is a mixture of printing paste, paint, a paint printing synergist, an adhesive, urea, ammonium sulfate, vat dye and acid dye; (3) baking the fabric printed in the step (2) at high temperature; (4) firstly ageing the fabric printed in the step (3), and then carrying out reduction ageing; 5, the fabric aged in the step 4 is sequentially subjected to water washing, oxidation, soaping and secondary water washing, and then the chinlon 66 / cotton blended printed fabric is obtained.The printed product is uniform in color, clear in pattern outline, quite excellent in color fastness, high in dye uptake, capable of improving the rubbing color fastness and the soaping color fastness and capable of enhancing washing fastness.

Description

Technical Field

[0001] This invention belongs to the field of textile printing and dyeing technology, and relates to a method for preparing nylon 66 / cotton blended printed fabric. Background Technology

[0002] Nylon fiber possesses a range of excellent properties, including good elasticity, high strength, good moisture absorption, lightweight, and abrasion resistance. Commonly used varieties are nylon 6 and nylon 66. Compared to nylon 6, nylon 66, due to its higher crystallinity and tighter molecular arrangement, offers advantages such as higher strength, better resistance to deformation, stronger abrasion resistance, and superior stain resistance. Furthermore, nylon 66 provides better comfort. To meet the requirements of military applications, blending domestically produced nylon 66 with cotton may be a good solution.

[0003] Currently, the common method for printing nylon / cotton blended fabrics is to use two dyes in the same paste. However, due to the different molecular structures and dyeing conditions of the two fibers, the fabric is prone to problems such as staining and poor color fastness. Patent CN 101597868A developed a printing process for nylon / cotton fabrics using reactive and neutral dyes in the same paste for catalytic fixation, solving the problems of low fixation rate and poor staining fastness of nylon / cotton fabrics, but it has not yet met the fastness standards for military use. CN 105887515A discloses a printing method for nylon 56 / cotton blended fabrics, using reactive dyes in the same paste to achieve a consistent color result for both fibers. Patent CN 103572580A developed a printing process for nylon / cotton fabrics using reduction and neutral dyes in the same paste, resulting in high color fastness indicators for the printed fabrics, but with a shallow color depth. Furthermore, patents CN 114687227A and CN111350088B developed a pretreatment process for inkjet printing on nylon / cotton fabrics. However, due to the developing stage of the digital printing market, large-scale industrial application is not yet possible. Compared to nylon 6, nylon 66 has higher crystallinity, making it difficult for dyes to penetrate the amorphous regions of the fiber, resulting in lower dye uptake. Therefore, developing a nylon 66 / cotton blended printed fabric and its preparation method to meet the various color fastness indicators required for military applications is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing nylon 66 / cotton blended printed fabric.

[0005] This invention selects a printing paste made from a mixture of acid dyes, vat dyes, and pigment dyes to print on domestically produced nylon 66 / cotton blended fabrics. The resulting printed products have uniform color, high color fastness, and clear pattern outlines. Through a pre-setting process, dye molecules can more easily enter the amorphous region of nylon 66, improving the dyeing rate. By using a pigment printing synergist, the film-forming properties of the adhesive are improved, enhancing the adhesion between dye molecules and fibers, improving rubbing and washing color fastness, and enhancing wash resistance.

[0006] This invention provides a method for preparing a nylon 66 / cotton blended printed fabric, comprising the following steps: 1) The fabric is pretreated by a one-bath annealing, scouring and bleaching process, and then pre-shaped at high temperature; 2) Print the fabric treated in step 1); The printing paste used in the printing process is a mixture of printing paste, coating, coating printing enhancer, adhesive, urea, ammonium sulfate, vat dye and acid dye. 3) The fabric printed in step 2) is then baked at a high temperature; 4) The fabric baked in step 3) is first steamed, and then reduced steamed; 5) The fabric steamed in step 4) is then washed, oxidized, soaped, and washed a second time; then dried to obtain nylon 66 / cotton blended printed fabric.

[0007] In this invention, the one-bath desizing, boiling, and bleaching method is a conventional method in the field, specifically combining the three steps of desizing, boiling, and bleaching into one step.

[0008] In the above preparation method, in step 1), the pretreatment solution of the one-bath descaling and bleaching pretreatment is a mixture of sodium hydroxide, hydrogen peroxide, hydrogen peroxide stabilizer, refining agent, degreasing agent and desizing agent. Using the above pretreatment solution has the advantages of saving time and reducing energy consumption.

[0009] In the above preparation method, the hydrogen peroxide stabilizer can specifically be TF-122G; The refining agent may specifically be DM-1306H; The degreasing agent may specifically be DM-1119N; The desizing agent may specifically be DM-1322H.

[0010] In this invention, the amount of pretreatment solution used in the one-bath pretreatment method of dehydration, boiling and bleaching is the conventional amount, such as 2g / L for DM-1306H; 3g / L for DM-1119N; and 2g / L for DM-1322H.

[0011] In the above preparation method, the pretreatment temperature of the one-bath dehydration, boiling and bleaching method can be 90-110℃, specifically 100℃, and the treatment time can be 60-80 minutes, specifically 60 minutes. The temperature for the high-temperature pre-conditioning can be 140-170℃, specifically 160℃, and the time can be 100-150s, specifically 120s, to reduce fabric wrinkles and change the crystal structure of fiber molecules.

[0012] In the above preparation method, in step 2), the printing paste is NEOPOL PFJ purchased from Transfar Corporation; The coating was Coating Black G-55, purchased from Shanghai Ink Silian Industrial Co., Ltd. The coating printing enhancer was TF-3912, which was purchased from Transfar Corporation. The adhesive is Adhesive 505, which was purchased from Yimei Chemical.

[0013] In the above preparation method, in step 3), the baking temperature of the high-temperature baking can be 130-160℃, specifically 150℃, and the baking time can be 1-3 minutes, specifically 2 minutes.

[0014] In the above preparation method, in step 4), the steaming temperature can be 100-110℃, specifically 102℃, and the steaming time can be 20-40 minutes, specifically 30 minutes.

[0015] In the above preparation method, in step 4), the reducing solution used for the reduction vaporization is composed of the following components at the following concentrations: sodium hydrosulfite 80-110 g / L, specifically 90 g / L, sodium hydroxide 70-90 g / L, specifically 80 g / L; The reduction vaporization temperature can be 120-140℃, specifically 130℃, and the reduction vaporization time can be 1-3 minutes, specifically 2 minutes.

[0016] In the above preparation method, in step 5), the oxidizing solution used for oxidation can be hydrogen peroxide with a concentration of 2-3 g / L, specifically 3 g / L.

[0017] In the above preparation method, in step 5), the soaping solution used for soaping consists of the following components at the following concentrations: DM-1588G anti-staining cleaning agent with a concentration of 2-3 g / L, purchased from Guangdong Demei Fine Chemical Co., Ltd.; and sodium carbonate with a concentration of 1-2 g / L. The temperature for soap washing can be 45-55℃, specifically 50℃.

[0018] In the above preparation method, in step 5), the drying temperature can be 100-110℃, specifically 100℃, and the time can be 10-20 minutes, specifically 15 minutes.

[0019] The present invention has the following beneficial effects: 1. Given the current lack of reports on nylon 66 / cotton blended printed fabrics, this invention uses a mixture of acid dyes, vat dyes, and pigments to dye domestically produced nylon 66 / cotton blended fabrics. Vat dyes exhibit excellent printing effects on both nylon 66 and cotton fibers, resulting in printed products with uniform color and clear pattern outlines. Furthermore, vat dyes demonstrate excellent color fastness to cotton, especially in terms of lightfastness. Then, by utilizing the characteristic that acid dyes can only dye nylon 66 under acidic conditions, the invention compensates for the lower dyeing rate of vat dyes on nylon 66 compared to cotton, thus solving the problem of dyeing uniformity. Finally, the film-forming effect of the adhesive not only firmly adsorbs the pigment onto the fabric but also improves the adhesion between the dye and the fiber, reducing surface floating of the fabric and enhancing color fastness.

[0020] 2. To address the issue of low dye uptake caused by the higher crystallinity of nylon 66, which makes it difficult for dyes to penetrate the amorphous region of the fiber, this invention uses a pre-forming process to fix the fabric shape and stabilize the size to prevent wrinkles from occurring during high-temperature processes such as steaming, which would affect the uniformity of dyeing. Moreover, it can change the uniformity of the arrangement of the crystalline and amorphous regions of nylon macromolecules, making it easier for dye molecules to enter the amorphous region of the fiber and improve the dye uptake rate.

[0021] 3. To address the issues of low color fastness and poor washability in printing of nylon 66 / cotton blended fabrics, a pigment printing synergist is used to improve the film-forming properties of the adhesive, enhance the bond between the dye and the fiber, improve the color fastness to rubbing and washing, and enhance washability. Attached Figure Description

[0022] Figure 1 This is a picture of the nylon 66 / cotton blend printed fabric in Embodiment 1 of the present invention. Detailed Implementation

[0023] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0024] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0025] Example 1: (1) The fabric is placed in a high-temperature oscillating dyeing machine for a one-bath desizing, scouring and bleaching treatment. The pretreatment solution formula is as follows: degreasing agent DM-1119N: 3g / L, high-concentration refining agent DM-1306H: 2g / L, high-concentration desizing agent DM-1322H: 2g / L, sodium hydroxide: 12g / L, H2O2 (30%): 8g / L, oxygen bleaching stabilizer TF-122G: 1g / L, the temperature is 100℃, and the treatment time is 60 minutes; then, high-temperature pre-setting is carried out on a continuous setting machine. The setting temperature is 160℃ and the pre-setting time is 120s.

[0026] (2) Place the de-simmered and bleached fabric into a rotary screen printing machine for printing. The formula of the printing paste is as follows: printing paste NEOPOL PFJ: 4%, urea: 5%, ammonium sulfate: 2%, binder 505: 10%, pigment printing enhancer (TF-3912 from Transfar Group): 0.5%, dye (composed of pigment, vat dye and acid dye): the specific dosage is as follows; The dye is selected from any of the following: Composition of yellow-green pigment paste dye: T olive green: 2.6 g / L, Lihua blue: 0.35 g / L, paint black G-55: 0.7 g / L; Composition of brown pigment paste dye: G Yellow: 0.63 g / L, BR Brown: 2.4 g / L, Lihua Suzhang Blue: 0.5 g / L, Coating Black G-55: 2.2 g / L; Composition of the ochre pigment paste: G Yellow: 0.42 g / L, Lihua Suzhangqing: 0.36 g / L, BR Brown: 0.34 g / L, Coating Black G-55: 0.5 g / L.

[0027] (3) Place the printed fabric in a continuous setting machine for high-temperature baking at 150°C for 2 minutes.

[0028] (4) Place the baked fabric in a steamer with a steaming pressure of 0.5 MPa, a steaming temperature of 102°C, and a steaming time of 30 minutes; then perform rapid reduction steaming on the steamed fabric. The reduction solution formula is 90 g / L sodium hydrosulfite and 80 g / L sodium hydroxide. The reduction steaming temperature is 130°C and the reduction steaming time is 2 minutes.

[0029] (5) Wash the steamed fabric with cold water first, then soak it in an oxidizing solution at room temperature. The oxidizing solution formula is 3g / L hydrogen peroxide. Then soap it. The soaping solution formula is 3g / L anti-staining cleaning agent and 2g / L sodium carbonate. The soaping temperature is 50℃. Finally, wash the soaped fabric with cold water again.

[0030] (6) The washed fabric is placed in a vacuum drying oven for drying at 100°C for 15 minutes to obtain nylon 66 / cotton blended printed fabric.

[0031] Comparative Example 1 Similar to Embodiment 1 of the present invention, except that step (2) only uses paint printing.

[0032] Comparative Example 2 Similar to Embodiment 1 of the present invention, except that the high-temperature pre-forming step is not performed in step (1).

[0033] Comparative Example 3 Similar to Embodiment 1 of the present invention, except that no printing enhancer is added in step (2).

[0034] The time results data for Example 1 and Comparative Examples 1-3 above are shown in Table 1: Table 1

[0035] As shown in Table 1, the color fastness grades of samples printed using conventional pigment printing processes on blended fabrics are relatively low. This is because the pigments adhere to the fabric through an adhesive, and some of the adhesive detaches from the fabric under washing or physical action, resulting in poor color fastness. However, printing pastes using a blend of multiple dyes and pigments not only provide physical bonding between the adhesive and the fiber but also chemical bonding and intermolecular forces between the dye molecules and the fiber. Under this dual cross-linked network structure of physical and chemical bonding, the color fastness grades of the printed fabrics to rubbing and washing are significantly improved. Compared to fabrics without high-temperature pre-setting, the color fastness grades of the pre-set fabrics are slightly improved, indicating that high-temperature pre-setting treatment has a positive effect on improving color fastness. Furthermore, the addition of printing enhancers improves the color fastness grades to washing, mainly because it enhances the film-forming effect of the adhesive, thereby promoting the physical bonding between the dye and the fiber. In summary, the method for preparing nylon 66 / cotton blended printed fabrics provided by this invention can impart high color fastness grades to the fabric, and the process is easy to control and suitable for industrial production.

Claims

1. A method for preparing a nylon 66 / cotton blended printed fabric, comprising the following steps: 1) The fabric is pretreated by a one-bath annealing, scouring and bleaching process, and then pre-shaped at high temperature; 2) Print the fabric treated in step 1); in, The printing paste used in the printing process is a mixture of printing paste, coating, coating printing enhancer, adhesive, urea, ammonium sulfate, vat dye, and acid dye. 3) The fabric printed in step 2) is then baked at a high temperature; 4) The fabric printed in step 3) is first steamed, and then reduced steamed; 5) The fabric steamed in step 4) is sequentially washed, oxidized, soaped and washed a second time; then dried to obtain nylon 66 / cotton blended printed fabric.

2. The preparation method according to claim 1, characterized in that, In step 1), the pretreatment solution of the one-bath desizing, scouring and bleaching pretreatment is a mixture of sodium hydroxide, hydrogen peroxide, hydrogen peroxide stabilizer, refining agent, degreasing agent and desizing agent.

3. The preparation method according to claim 2, characterized in that, The hydrogen peroxide stabilizer is TF-122G; The refining agent is DM-1306H; The degreasing agent is DM-1119N; The desizing agent is DM-1322H.

4. The preparation method according to any one of claims 1-3, characterized in that, The pretreatment temperature of the dehydration, scalding, and bleaching one-bath method is 90-110℃, and the treatment time is 60-80 minutes. The temperature for the high-temperature pre-test is 140–170°C, and the time is 100–150 seconds.

5. The preparation method according to any one of claims 1-4, characterized in that, In step 2), the printing paste is NEOPOL PFJ, which is commercially available from Transfar Corporation. The coating was Coating Black G-55, purchased from Shanghai Ink Silian Industrial Co., Ltd. The coating printing enhancer was TF-3912, which was purchased from Transfar Corporation. The adhesive is Adhesive 505, which was purchased from Yimei Chemical.

6. The preparation method according to any one of claims 1-5, characterized in that, In step 3), the high-temperature baking temperature is 130-160℃, and the baking time is 1-3 minutes; In step 4), the steaming temperature is 100-110°C and the steaming time is 20-40 minutes.

7. The preparation method according to any one of claims 1-6, characterized in that, The steaming temperature in step 4) is 100-110°C, and the steaming time is 20-40 minutes.

8. The preparation method according to any one of claims 1-7, characterized in that, In step 4), the reducing solution used in the reduction vaporization consists of the following components at the following concentrations: sodium hydrosulfite 80-110 g / L, sodium hydroxide 70-90 g / L; The reduction vaporization temperature is 120–140°C, and the reduction vaporization time is 1–3 minutes.

9. The preparation method according to any one of claims 1-8, characterized in that, In step 5), the oxidizing solution used is hydrogen peroxide with a concentration of 2-3 g / L.

10. The preparation method according to any one of claims 1-9, characterized in that, In step 5), the soaping solution used for soaping consists of the following components at the following concentrations: DM-1588G anti-staining cleaning agent with a concentration of 2-3 g / L, purchased from Guangdong Demei Fine Chemical Co., Ltd.; and sodium carbonate with a concentration of 1-2 g / L. The temperature of the soap wash is 45–55°C; In step 5), the drying temperature is 100-110°C and the time is 10-20 minutes.

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