A digital direct injection printing process for diacetate fiber without steaming and washing

Abstract

The present invention belongs to the technical field of textile printing and processing. The present invention discloses a digital direct injection printing process for two-acetate fiber without steaming and washing. The digital direct injection printing process for two-acetate fiber of the present invention comprises the following steps: sizing treatment, pre-drying, inkjet printing and baking are sequentially carried out on a two-acetate fiber grey cloth to obtain an inkjet printed fabric. The present invention only needs to complete the printing of the acetate fiber grey cloth through sizing treatment - pre-drying - inkjet printing - baking, without steaming. During the baking process, the dye ink quickly diffuses into the acetate fiber to complete the coloring process. The solid content of the thickener is low, and there is no need for water washing after printing, and the baking time is short, which greatly saves resources and energy.

Description

Technical Field

[0001] The present invention relates to the technical field of textile printing and processing, and in particular to a digital direct injection printing process for diacetate fiber without steaming and washing. Background Art

[0002] Digital printing is a high-tech product gradually formed with the continuous development of computer technology. Digital printing has the advantages of low energy consumption, low pollution, fast and flexible, etc., can ensure high printing quality, meet customer needs, and has broad market application prospects. It is an important development direction in the technical field of textile printing and processing. Acetate fiber fabrics have the characteristics of good drapability, comfortable wearing and moisture absorption, and the clothing made of acetate fiber fabrics is safe and environmentally friendly. For decades, acetate fiber fabrics have always been at the forefront in the field of clothing fabrics. With the increasingly fierce competition in the clothing market, the high-grade and comfortable clothing fabrics have led to a sharp expansion of the market for acetate fiber fabrics, and the printing process of acetate fiber fabrics has developed vigorously.

[0003] However, the existing digital printing process for acetate fiber disperse dyes is usually: pretreatment of printing paste - drying - high-temperature high-pressure steaming - water washing process. During the printing process, the steaming temperature is high, the pressure is high, and the time is long, which requires a large amount of energy consumption, and a large amount of water is required during the water washing process. Moreover, printing problems such as bleeding are also likely to occur during the printing process. Therefore, there is an urgent need in this field to develop a printing process for acetate fiber fabrics that is free of steaming and washing, has a short baking time, and saves energy. Summary of the Invention

[0004] The purpose of the present invention is to provide a digital direct injection printing process for diacetate fiber without steaming and washing, so as to solve the problems existing in the existing digital printing process for acetate fiber disperse dyes, such as high steaming temperature, high pressure, long time, large energy consumption, large water consumption during the water washing process, and easy bleeding during the printing process.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The present invention provides a digital direct injection printing process for diacetate fiber without steaming and washing, comprising the following steps:

[0007] The diacetate fiber grey cloth is successively subjected to sizing treatment, pre-drying, inkjet printing and baking to obtain an inkjet printed fabric.

[0008] Preferably, the components and their mass percentage contents of the sizing agent used in the sizing treatment are: thickener 0.8 - 1.5%, softener 0.8 - 1.2%, and the rest is water.

[0009] Preferably, the thickener is polyacrylic acid thickener; the softener is amino silicone oil.

[0010] Preferably, the sizing treatment is one-dip one-roll, the liquor pickup rate of the sizing treatment is 80-90%, the vehicle speed of the sizing treatment is 50-70 m / min, and the squeezing pressure of the sizing treatment is 12-14 kN.

[0011] Preferably, the temperature of the pre-drying is 80-100 °C, and the time of the pre-drying is 4-6 min.

[0012] Preferably, the inkjet printing includes the following steps: inkjet printing the pre-dried diacetate fiber grey cloth with dye ink.

[0013] Preferably, the components and their mass percentage contents of the dye ink are: 10-15% of disperse dye ink, 10-15% of dispersant, 0.5-0.7% of surfactant, and the rest is water.

[0014] Preferably, the temperature of the baking is 185-195 °C, and the time of the baking is 50-70 s.

[0015] It can be seen from the above technical solutions that, compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The present invention provides a digital direct injection printing process for diacetate fibers without steaming and washing. The printing of the diacetate fiber grey cloth can be completed only through sizing treatment - pre-drying - inkjet printing - baking, without steaming. During the baking process, the dye ink quickly diffuses into the diacetate fibers to complete the coloring process. The solid content of the thickener is low, and there is no need for water washing after printing, and the baking time is short, which greatly saves resources and energy. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0018] Figure 1 It is a color block diagram and a line diagram of inkjet printing. Among them, a is the color block diagram, and b is the line diagram;

[0019] Figure 2 It is a color yield curve diagram of the inkjet printed fabrics obtained in Example 1 and Comparative Examples 1-2. Among them, C is the color block obtained by blue dye ink, M is the color block obtained by red dye ink, Y is the color block obtained by yellow dye ink, and K is the color block obtained by black dye ink;

[0020] Figure 3Raman spectroscopy characterization results of the inkjet printed fabrics obtained in Example 1 and Comparative Examples 1-2;

[0021] Figure 4 Color yield curves of the inkjet printed fabrics obtained in Example 1 and Comparative Examples 3-6, where C is the color block obtained with blue dye ink, M is the color block obtained with red dye ink, Y is the color block obtained with yellow dye ink, and K is the color block obtained with black dye ink;

[0022] Figure 5 Raman spectroscopy characterization results of the inkjet printed fabrics obtained in Example 1, Comparative Example 3 and Comparative Examples 5-6;

[0023] Figure 6 Color yield curves of the inkjet printed fabrics obtained in Example 1, Comparative Example 4 and Comparative Examples 7-12, where C is the color block obtained with blue dye ink, M is the color block obtained with red dye ink, Y is the color block obtained with yellow dye ink, and K is the color block obtained with black dye ink;

[0024] Figure 7 Line diagrams of the inkjet printed fabrics obtained in Example 1 and Comparative Example 13, where a is Example 1 and b is Comparative Example 13. Detailed implementation mode

[0025] The present invention provides a digital direct injection printing process for diacetate fiber without steaming and washing, comprising the following steps:

[0026] The diacetate fiber grey cloth is successively subjected to sizing treatment, pre-drying, inkjet printing and baking to obtain an inkjet printed fabric.

[0027] In the present invention, the components and their mass percentage contents of the sizing agent used in the sizing treatment are: thickener 0.8-1.5%, softener 0.8-1.2%, and the rest is water; the mass percentage content of the thickener is preferably 0.9-1.4%, more preferably 1-1.2%; the mass percentage content of the softener is preferably 0.9-1.1%, more preferably 1%.

[0028] In the present invention, the thickener is preferably a polyacrylic acid thickener, more preferably a KF-386 acrylic polymer thickener; the softener is preferably an amino silicone oil.

[0029] In the present invention, the sizing treatment is preferably one-dip and one-roll; the liquor pickup rate of the sizing treatment is preferably 80-90%, more preferably 82-88%; the vehicle speed of the sizing treatment is preferably 50-70 m / min, more preferably 60-65 m / min; the squeezing pressure of the sizing treatment is preferably 12-14 kN, more preferably 12.5-13.5 kN.

[0030] In the present invention, the temperature of the pre-drying is preferably 80 - 100 °C, more preferably 90 - 95 °C; the time of the pre-drying is preferably 4 - 6 min, more preferably 300 - 320 s.

[0031] In the present invention, the inkjet printing includes the following steps: inkjet printing on the pre-dried diacetate fiber fabric using dye ink.

[0032] In the present invention, the components and their mass percentages of the dye ink are preferably: disperse dye ink 10 - 15%, dispersant 10 - 15%, surfactant 0.5 - 0.7%, and the rest is water.

[0033] In the present invention, the size of the printed pattern of the inkjet printing is drawn by Photoshop mapping software.

[0034] In the present invention, the temperature of the curing is preferably 185 - 195 °C, more preferably 188 - 190 °C; the time of the curing is preferably 50 - 70 s, more preferably 60 - 65 s.

[0035] The technical solutions provided by the present invention will be described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0036] The dye inks used in the following examples and comparative examples are blue dye ink, red dye ink, yellow dye ink, and black dye ink;

[0037] The components and their mass percentages of the blue dye ink are: blue disperse dye ink 10, SP-717 dispersant 12%, surfactant OP-10 0.5%, and the rest is water; the components and their mass percentages of the red dye ink are: red disperse dye ink 10, SP-717 dispersant 12%, surfactant OP-10 0.5%, and the rest is water; the components and their mass percentages of the yellow dye ink are: yellow disperse dye ink 10, SP-717 dispersant 12%, surfactant OP-10 0.5%, and the rest is water; the components and their mass percentages of the black dye ink are: black disperse dye ink 10, SP-717 dispersant 12%, surfactant OP-10 0.5%, and the rest is water;

[0038] The inkjet printing in the following examples and comparative examples includes the following steps: four samples with a size of 5 cm × 40 cm are drawn by Photoshop mapping software, and the above four different color dye inks are respectively inkjet printed on the pre-dried fabric according to the sample size to obtain four samples, as Figure 1As shown in Fig. a; among them, the color block obtained by the blue dye ink is denoted as C, the color block obtained by the red dye ink is denoted as M, the color block obtained by the yellow dye ink is denoted as Y, and the color block obtained by the black dye ink is denoted as K; 12 lines are drawn by Photoshop mapping software, including 4 lines with a width of 1 mm, 4 lines with a width of 2 mm, and 4 lines with a width of 5 mm; the above 4 different colors of dye inks are respectively inkjet-printed on the pre-baked base fabric according to the above line dimensions, and the same-sized lines are inkjet-printed with 4 different colors of dye inks, such as Figure 1 as shown in Fig. b.

[0039] Example 1

[0040] The components and their mass percentages of the slurry used in this example are: 1% of KF-386 acrylic polymer thickener, 1% of amino silicone oil, and 93% of water;

[0041] The diacetate fiber base fabric is sized by one-dip-one-roll sizing with the above slurry, keeping the liquor pickup rate at 85%, the vehicle speed at 60 m / min, the squeezing pressure at 13 kN, pre-baking at 90°C for 5 min after sizing, the above color blocks and lines drawn by Photoshop mapping software are inkjet-printed on the pre-baked base fabric, and finally baked at 190°C for 60 s to obtain an inkjet-printed fabric.

[0042] Comparative Example 1

[0043] Replace 1% of the KF-386 acrylic polymer thickener in Example 1 with 1.5% of the KF-386 acrylic polymer thickener, and the others are the same as in Example 1.

[0044] Comparative Example 2

[0045] Replace 1% of the KF-386 acrylic polymer thickener in Example 1 with 2% of the KF-386 acrylic polymer thickener, and the others are the same as in Example 1.

[0046] Measure the color yield (K / S) of the inkjet-printed fabrics obtained in Example 1 and Comparative Examples 1-2.

[0047] Measurement method: Use a Datacolor 500 spectrophotometer to measure the K / S value of the inkjet-printed fabric. Before measurement, fold the inkjet-printed fabric twice so that light cannot penetrate the inkjet-printed fabric. Each color block is measured 5 times at different positions, and finally the average value is taken as the test data and recorded. The obtained results are as Figure 2 shown.

[0048] From Figure 2It can be seen that as the amount of thickener increases, the K / S values of the blue and yellow color patches increase accordingly. Among them, when the thickener concentration is 1.5%, the K / S value reaches the peak. The K / S value of the red color patch changes little and the curve is relatively flat, while the K / S value of the black color patch decreases significantly. This is because during the sizing process, as the amount of thickener increases, the viscosity of the thickener increases more significantly. After being applied to the surface of the grey fabric, a film is formed on its surface, which has a certain hindrance to the diffusion of the dye ink during the subsequent baking. By controlling the amount of thickener, inkjet printing fabrics with higher color yield can be obtained.

[0049] The inkjet printing fabrics obtained in Example 1 and Comparative Examples 1-2 were characterized by Raman spectroscopy, and the results are as Figure 3 shown.

[0050] From Figure 3 it can be seen that for the grey fabric of diacetate fiber treated with different amounts of thickener, there are significant differences in the diffusion of the dye ink in the diacetate fiber. When the thickener concentration increases to 2%, under the action of the thickener, the dye ink can quickly diffuse into the fiber and reach a deeper diffusion at 190 °C; due to the good water-holding property of the polyacrylic thickener, it can carry the dye ink and diffuse into the interior of the fibers of the diacetate fiber grey fabric.

[0051] Comparative Example 3

[0052] The baking temperature of 190 °C in Example 1 was replaced with 170 °C, and the others were the same as in Example 1.

[0053] Comparative Example 4

[0054] The baking temperature of 190 °C in Example 1 was replaced with 180 °C, and the others were the same as in Example 1.

[0055] Comparative Example 5

[0056] The baking temperature of 190 °C in Example 1 was replaced with 200 °C, and the others were the same as in Example 1.

[0057] Comparative Example 6

[0058] The baking temperature of 190 °C in Example 1 was replaced with 210 °C, and the others were the same as in Example 1.

[0059] The color yield (K / S) of the inkjet printing fabrics obtained in Example 1 and Comparative Examples 3-6 was measured.

[0060] Measurement method: Use a Datacolor 500 spectrophotometer to measure the K / S value of the inkjet printing fabric. Before measurement, fold the inkjet printing fabric twice so that light cannot penetrate the inkjet printing fabric. Each color patch is measured 5 times at different positions, and finally the average value is taken as the test data and recorded. The results are asFigure 4 as shown

[0061] It can be seen from Figure 4 that the color yield of the inkjet printed fabric is quite sensitive to the curing temperature. As the curing temperature increases, the K / S values of the color patches of the four different colors also increase. When the curing temperature transitions from 180 °C to 190 °C, the rising trend of the K / S value curve is steep. However, after the curing temperature exceeds 190 °C, the increase in the K / S value of the color patches is small, and the overall increase in the K / S values of the color patches of the four different colors tends to level off. In addition to being related to the glass transition temperature of the diacetate fiber grey fabric, due to the poor heat resistance of the diacetate fiber grey fabric, dyeing at high temperatures will cause a loss of strength of the diacetate fiber grey fabric, and at the same time, the luster of the grey fabric will also deteriorate. Moreover, too high a curing temperature will cause the resulting inkjet printed fabric to turn yellow overall, and the hand feeling will become worse. The inkjet printed fabric becomes stiff and shrinks significantly when heated

[0062] The soaping fastness of the inkjet printed fabrics obtained in Example 1 and Comparative Examples 4 - 6 was determined

[0063] Determination method: Refer to GB / T 3921-2008 "Textiles - Tests for colour fastness - Colour fastness to soaping" for determination, and after soaping, grade with a staining scale and a fading scale under the D65 light box light source, and grade with reference to GB / T251-2008 "Grey scale for assessing staining" and GB / T250-2008 "Grey scale for assessing change in colour". The obtained results are shown in Table 1

[0064] Table 1 Determination results of the soaping fastness of the inkjet printed fabrics obtained in Example 1 and Comparative Examples 4 - 6

[0065]

[0066]

[0067] It can be seen from Table 1 that for the diacetate fiber grey fabric treated with the thickener, the cotton staining fastness after curing under different conditions can reach level 4 - 5. As the curing temperature increases, the dye ink develops color more significantly, so the fading fastness also increases. From not being fully adsorbed and developed at 180 °C to being fully developed at 210 °C, the fading fastness increases from level 2 to level 4 - 5. The inkjet printed fabric obtained in Example 1 can achieve a very high soaping fastness under relatively mild curing temperature conditions

[0068] The inkjet printed fabrics obtained in Example 1, Comparative Example 3 and Comparative Examples 5 - 6 were characterized by Raman spectroscopy, and the obtained results are as Figure 5 shown

[0069] It can be seen from Figure 5It can be seen that as the baking temperature increases, the Raman intensity of the dye ink inside the fiber of the inkjet-printed fabric increases accordingly, indicating that the content of the dye ink in the fiber is continuously increasing; when the baking temperature is low, the dye ink does not diffuse into the fiber interior; the diffusion of the dye ink in the acetate fiber follows the free volume model.

[0070] Comparative Example 7

[0071] Replace the baking time of 60 s in Example 1 with 30 s, and the others are the same as in Example 1.

[0072] Comparative Example 8

[0073] Replace the baking time of 60 s in Example 1 with 45 s, and the others are the same as in Example 1.

[0074] Comparative Example 9

[0075] Replace the baking time of 60 s in Example 1 with 90 s, and the others are the same as in Example 1.

[0076] Comparative Example 10

[0077] Replace the baking time of 60 s in Comparative Example 4 with 30 s, and the others are the same as in Comparative Example 4.

[0078] Comparative Example 11

[0079] Replace the baking time of 60 s in Comparative Example 4 with 45 s, and the others are the same as in Comparative Example 4.

[0080] Comparative Example 12

[0081] Replace the baking time of 60 s in Comparative Example 4 with 90 s, and the others are the same as in Comparative Example 4.

[0082] Measure the color yield (K / S) of the inkjet-printed fabrics obtained in Example 1, Comparative Example 4, and Comparative Examples 7 - 12.

[0083] Measurement method: Use a Datacolor 500 spectrophotometer to measure the K / S value of the inkjet-printed fabric. Before measurement, fold the inkjet-printed fabric twice so that light cannot penetrate the inkjet-printed fabric. Each color patch is measured 5 times at different positions, and finally the average value is taken as the test data and recorded. The obtained results are as Figure 6 shown.

[0084] From Figure 6It can be seen that the inkjet-printed fabric is not sensitive to the change of baking time, and the color yield of the inkjet-printed fabric does not increase significantly, but shows an overall upward trend. The color yield of the inkjet-printed fabric at a baking temperature of 190 °C is much higher than that of the inkjet-printed fabric at a baking temperature of 180 °C. The main reason is that at 190 °C, the macromolecular chains of the fibers start to move, and the dye ink diffuses into the interior of the fibers. Therefore, the color yield of the inkjet-printed fabric is improved. However, long-term baking at high temperatures will cause the inkjet-printed fabric to harden, the hand feel to deteriorate, and the printed pattern to spread and bleed severely, and the printing effect and clarity will also deteriorate accordingly.

[0085] The soaping fastness of the inkjet-printed fabrics obtained in Example 1 and Comparative Examples 7-9 was measured.

[0086] Measurement method: Refer to GB / T 3921-2008 "Textiles - Tests for colour fastness - Colour fastness to soaping" for measurement, and after soaping, rate the fabric using the staining scale and the fading scale under the D65 light box light source. Refer to GB / T 251-2008 "Grey scale for assessing staining" and GB / T 250-2008 "Grey scale for assessing change in colour" for rating. The results are shown in Table 2.

[0087] Table 2 Measurement results of the soaping fastness of the inkjet-printed fabrics obtained in Example 1 and Comparative Examples 7-9

[0088]

[0089]

[0090] As can be seen from Table 2, for the diacetate fiber greige fabric treated with the thickener, the cotton staining fastness and the fading fastness increase with the increase of the baking time. This is because when the time is too short, the dye ink has not fully dispersed, and part of it still remains as surface floating color. Therefore, excessive fading will occur during the soaping process, and the cotton standard cloth used for testing the cotton staining fastness will be contaminated. The inkjet-printed fabric obtained in Example 1 can achieve a very high soaping fastness under the condition that the baking time is moderate and energy waste is not caused.

[0091] Comparative Example 13

[0092] The greige fabric after inkjet printing in Example 1 was subjected to high-temperature high-pressure steam treatment at a temperature of 135 °C and a pressure of 600 kPa for 35 min, and then washed with water 3 times at 80 °C, with each washing time being 30 min, to obtain the inkjet-printed fabric.

[0093] The color yield (K / S) and soaping fastness of the inkjet-printed fabrics obtained in Example 1 and Comparative Example 13 were measured.

[0094] Measurement method of color yield (K / S): Use a Datacolor 500 spectrophotometer to measure the K / S value of the inkjet printed fabric. Before measurement, fold the inkjet printed fabric twice so that light cannot penetrate it. Measure 5 times at different positions for each color block, and finally take the average value as the test data and record it;

[0095] Measurement method of soaping fastness: Refer to GB / T 3921-2008 "Textiles - Tests for color fastness - Color fastness to soaping" for measurement, and after soaping, rate it using a staining gray scale and a fading gray scale under a D65 light box light source. Refer to GB / T251-2008 "Gray scale for assessing staining" and GB / T250-2008 "Gray scale for assessing change in color" for rating. The obtained results are shown in Table 3.

[0096] Table 3 Performance measurement results of the inkjet printed fabrics obtained in Example 1 and Comparative Example 13

[0097]

[0098] The line diagrams of the inkjet printed fabrics obtained in Example 1 and Comparative Example 13 are as Figure 7 shown, where a is Example 1 and b is Comparative Example 13.

[0099] From Table 3 and Figure 7 it can be seen that the inkjet printed fabric obtained by the direct digital printing process of the diacetate fiber without steaming and washing has higher line clarity and higher printing quality.

[0100] From the above, it can be obtained that the direct digital printing process of the diacetate fiber without steaming and washing according to the present invention does not require steaming, does not require water washing after printing, and has a short baking time, greatly saving resources and energy. And the printing quality of the obtained inkjet printed fabric is high.

[0101] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A digital direct injection printing process for cellulose diacetate fiber without steaming and washing, characterized in that, It includes the following steps: The two-acetate fiber grey fabric is successively subjected to sizing treatment, pre-drying, inkjet printing and baking to obtain an inkjet-printed fabric; The components and their mass percentage contents of the sizing agent used in the sizing treatment are: thickener 0.8 - 1.5%, softener 0.8 - 1.2%, and the rest is water; The thickener is a KF-386 acrylic polymer thickener; the softener is amino silicone oil; The inkjet printing includes the following steps: using dye ink to perform inkjet printing on the pre-dried two-acetate fiber grey fabric; The baking temperature is 185 - 195 °C, and the baking time is 50 - 70 s.

2. The two-acetate fiber non-steam-washing digital direct-injection printing process according to claim 1, wherein The sizing treatment is one-dip-one-roll, the liquor pickup rate of the sizing treatment is 80 - 90%, the running speed of the sizing treatment is 50 - 70 m / min, and the squeezing pressure of the sizing treatment is 12 - 14 kN.

3. The digital direct injection printing process for cellulose diacetate fiber without steaming and washing according to claim 2, wherein The pre-drying temperature is 80 - 100 °C, and the pre-drying time is 4 - 6 min.

4. The process for digital direct injection printing of diacetate fiber without steaming and washing according to claim 3, wherein The components and their mass percentage contents of the dye ink are: disperse dye ink 10 - 15%, dispersant 10 - 15%, surfactant 0.5 - 0.7%, and the rest is water.

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