Active digital printing sizing agent composition as well as preparation method and application thereof

Abstract

The invention provides an active digital printing sizing agent composition. The active digital printing sizing agent composition is prepared from the following raw materials: 20-65 wt% of sodium alginate; 1 to 10 wt% of sodium carboxymethyl cellulose; 1 to 10 wt% of modified carboxymethyl cellulose ether; 10 to 20 weight percent of nano cellulose aqueous solution; 10 to 25 wt% of urea; 1-3 wt% of baking soda; 0.1 to 1 wt% of sodium hexametaphosphate; 1-3 wt% of reserve salt; 0.01 to 0.1 wt% of a defoaming agent; 0.01 to 0.1 wt% of a pigment; and the balance water. Compared with the prior art, the active digital printing sizing agent composition provided by the invention adopts the components with specific contents, realizes better integral interaction, and can reduce the consumption of paste powder by adding the nano-cellulose and increasing the viscosity of the sizing agent to obtain the sizing agent with the same viscosity, thereby reducing the pressure of paste removal during washing and improving the printing quality. The hand feeling of the fabric is further improved, the step of hand feeling finishing is omitted, use of chemicals such as a hand feeling finishing agent is saved, water consumption and energy consumption of softening after-finishing are reduced, and the method is particularly suitable for active digital printing.

Description

Technical Field

[0001] The present invention relates to the technical field of digital printing, and more specifically, to an active digital printing sizing agent composition, a preparation method thereof, and an application thereof. Background Art

[0002] The digital printing of textiles began in the 1970s, aiming to develop a non-contact printing system to digitally produce multicolor patterns. In recent years, with the continuous progress of computer technology, the digital printing technology has developed rapidly. Compared with traditional printing, digital printing technology is a product of the combination of digital technology and traditional printing and dyeing technology. By inputting images designed by CAD, scanned, or taken by a digital camera, it is directly transmitted to a digital inkjet printer, and patterns are directly formed on various textiles in an inkjet printing manner. It has the advantages of direct printing, clean process, flexible production process, high printing quality, rapid response, zero-inventory production, and consistent printing effects, and is the development direction of future textile printing technology. However, in actual applications, textile inkjet printing fails to achieve the expected results and has many problems. For example, the color depth of inkjet printing on textiles is insufficient, it is difficult to display thick and layered pattern texts, it is greatly affected by the materials of textiles, and bleeding will occur, thus restricting the development of textile inkjet printing.

[0003] Chinese Patent with Publication No. CN109056377A discloses a digital printing method for a thick silk fabric with double-sided imaging; after the surface of the thick silk fabric is activated and then treated with nanocellulose whiskers, a silk fabric with a layer of silk protein particles modified with nanocellulose whiskers attached to the surface is obtained, and then through digital printing treatment, a digital printing fabric of a thick silk fabric with double-sided imaging is obtained, which has bright colors, clear flower pattern outlines, completely aligned double-sided patterns, and high color fastness. However, this process requires pre-treatment of the fabric, increasing the number of processes.

[0004] Nanocellulose is a nanoscale product obtained by treating cellulose fibers. Nanocellulose is a nanoscale fiber made by chemical or physical treatment of plant cellulose, and its diameter is usually between a few nanometers and a few hundred nanometers. It has high strength, high specific surface area and good biocompatibility. Since the hydroxyl group located at the flat bond position of the pyranose glucose ring on the nanocellulose chain is hydrophilic, and the C-H bond located at the axial position of cellulose is hydrophobic, nanocellulose is amphiphilic and is a nanoparticle widely used to stabilize Pickering emulsions. It is a green, non-toxic, abundant and renewable resource. Nanocellulose is suitable for stabilizing water-in-oil Pickering emulsions. Nanocellulose-stabilized acrylate Pickering emulsion polymerization can produce polymer beads with a particle size of 0.5 to 1 μm. The beads are approximately round in shape, smooth in surface, and relatively uniform in size distribution, without the formation of oversized particles (Zhang Xiaoyu, Jiang Yang, Zhong Yi, Sui Xiaofeng, Mao Zhiping. Preparation of polyacrylate pigment printing adhesives by Pickering emulsion polymerization [J]. Coatings Industry, 2017, Vol. 47(4): 29-35).

[0005] For example, Chinese patent CN112593427B discloses an acidic digital printing paste composition for improving ink permeability and a preparation method thereof, which involves an acidic digital printing paste comprising carboxymethyl cellulose, alginate, hydroxyethyl methyl cellulose, an adsorption promoter, modified carboxymethyl cellulose ether, modified nano-silica and a non-ionic surfactant. The digital printing paste composition has the characteristics of high stability, high color yield on both sides, high ink permeability, soft hand feel, good printing uniformity and high clarity. The invention utilizes the thickening property of modified cellulose and alginate to ensure the clarity of digital printing. The nano-cage structure of cage-type silsesquioxane can be effectively combined with nano-silica, so that the silsesquioxane-nano-silica dye "complex" continues to penetrate to the reverse side of the fabric and react with the fiber, thereby improving the permeability of the ink. The non-ionic surfactant not only effectively solubilizes and disperses the acid dye, but also improves the dispersion of the modified nano-silica on the surface and inside of the fabric, thereby effectively improving the uniformity and fullness of the acidic digital printing.

[0006] However, in actual production, when Tencel and other special fiber fabrics are sizing and printed and then steamed, the cyan color always has the cloth hanging rod mark of the steamer, which affects the product quality and causes the product to be downgraded. Electron microscope observation of this fabric found that there are many gaps in the fiber slices and many longitudinal surface grooves. These rough structures cause the sizing rate of this fabric to be relatively large, and the proportion of urea and baking soda is relatively large, resulting in an increase in the color fixation rate, so the cloth hanging rod mark appears on the back. Therefore, it is necessary to develop active digital printing sizing agents for special fiber fabrics. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a reactive digital printing sizing agent composition, its preparation method and application. By adding nanocellulose to the reactive digital printing sizing agent composition provided by the present invention, the viscosity of the sizing agent is increased. To obtain a sizing agent with the same viscosity, the dosage of paste powder can be reduced, thereby reducing the pressure of de-pasting during washing, further improving the fabric handle, saving the steps of handle finishing, saving the use of chemicals such as handle finishing agents, and saving the water consumption and energy consumption of soft post-finishing. It is particularly suitable for reactive digital printing.

[0008] The present invention provides a reactive digital printing sizing agent composition, which is prepared from raw materials including the following components:

[0009] Sodium alginate 20 - 65 wt%;

[0010] Sodium carboxymethyl cellulose 1 - 10 wt%;

[0011] Modified carboxymethyl cellulose ether 1 - 10 wt%;

[0012] Nanocellulose aqueous solution 10 - 20 wt%;

[0013] Urea 10 - 25 wt%;

[0014] Sodium bicarbonate 1 - 3 wt%;

[0015] Sodium hexametaphosphate 0.1 - 1 wt%;

[0016] Anti-dyeing salt 1 - 3 wt%;

[0017] Defoaming agent 0.01 - 0.1 wt%;

[0018] Pigment 0.01 - 0.1 wt%;

[0019] Water for the balance.

[0020] Preferably, the content of the nanocellulose aqueous solution is 0.5% - 2%.

[0021] Preferably, the anti-dyeing salt is sodium m-nitrobenzenesulfonate.

[0022] Preferably, the pigment is a water-soluble edible pigment.

[0023] The present invention also provides a preparation method of the reactive digital printing sizing agent composition described in the above technical solution, including the following steps:

[0024] Mix sodium alginate, sodium carboxymethyl cellulose, modified carboxymethyl cellulose ether, nanocellulose aqueous solution, urea, sodium bicarbonate, sodium hexametaphosphate, anti-dyeing salt, defoaming agent, pigment and water, and then filter and stand them in sequence to obtain the reactive digital printing sizing agent composition.

[0025] Preferably, the mixing process is specifically as follows:

[0026] Each raw material is sequentially subjected to low-speed stirring and high-speed stirring to complete the mixing process.

[0027] Preferably, the rotation speed of the low-speed stirring is 10 - 20 r / min, and the time is 15 - 20 min; the rotation speed of the high-speed stirring is 40 - 60 r / min, and the time is 30 - 35 min.

[0028] Preferably, the mesh number of the filter screen for filtration is 100 - 400 meshes.

[0029] Preferably, the standing time is 1 - 4 h.

[0030] The present invention also provides a digital printing process, including the following steps:

[0031] Sizing is carried out by using an active digital printing sizing agent setting padding process. After digital printing, it is sequentially dried, steamed, washed with water, and ironed dry to obtain a fabric;

[0032] The active digital printing sizing agent is the active digital printing sizing agent composition described in the above technical solution.

[0033] The present invention provides an active digital printing sizing agent composition, which is prepared from raw materials including the following components: sodium alginate 20 - 65 wt%; sodium carboxymethyl cellulose 1 - 10 wt%; modified carboxymethyl cellulose ether 1 - 10 wt%; nano-cellulose aqueous solution 10 - 20 wt%; urea 10 - 25 wt%; sodium bicarbonate 1 - 3 wt%; sodium hexametaphosphate 0.1 - 1 wt%; anti-dyeing salt 1 - 3 wt%; defoaming agent 0.01 - 0.1 wt%; pigment 0.01 - 0.1 wt%; and the balance is water. Compared with the prior art, the active digital printing sizing agent composition provided by the present invention adopts specific content components to achieve better overall interaction. By adding nano-cellulose, the viscosity of the sizing agent is increased, and the dosage of the paste powder can be reduced to obtain a sizing agent with the same viscosity, thereby reducing the pressure of de-pasting during water washing, further improving the fabric handle, saving the steps of handle finishing, saving the use of chemicals such as handle finishing agents, and saving the water consumption and energy consumption of soft post-finishing. It is particularly suitable for active digital printing.

[0034] In addition, the preparation method provided by the present invention has a simple process, mild and easy-to-control conditions, easily available raw materials and low cost, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the filtration at the discharge port of the reaction kettle in the embodiment;

[0036] Figure 2It is a physical production diagram of padding sizing on a stentering machine in the application example;

[0037] Figure 3 It is the physical object after the application of Comparative Example 1 Figure 1 ;

[0038] Figure 4 It is the physical object after the application of Example 1 Figure 1 ;

[0039] Figure 5 It is the physical object after the application of Comparative Example 1 Figure 2 ;

[0040] Figure 6 It is the physical object after the application of Example 1 Figure 2 ;

[0041] Figure 7 It is the physical object after the application of Comparative Example 1 Figure 3 ;

[0042] Figure 8 It is the physical object after the application of Example 1 Figure 3 ;

[0043] Figure 9 It is the physical diagram after printing of Example 2 and Comparative Examples 2-2 and 2-1 (pattern 1);

[0044] Figure 10 It is the physical diagram after printing of Example 2 and Comparative Examples 2-2 and 2-1 (pattern 2);

[0045] Figure 11 It is a schematic diagram of the aggregated structure of nanocellulose;

[0046] Figure 12 It is a schematic diagram of the nanocellulose-dye complex. Detailed implementation manners

[0047] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] The present invention provides an active digital printing sizing agent composition, which is prepared from raw materials including the following components:

[0049] Sodium alginate 20-65 wt%;

[0050] Sodium carboxymethyl cellulose 1-10 wt%;

[0051] Modified carboxymethyl cellulose ether 1-10 wt%;

[0052] 10 - 20 wt% of aqueous nano - cellulose solution;

[0053] 10 - 25 wt% of urea;

[0054] 1 - 3 wt% of sodium bicarbonate;

[0055] 0.1 - 1 wt% of sodium hexametaphosphate;

[0056] 1 - 3 wt% of anti - staining salt;

[0057] 0.01 - 0.1 wt% of defoamer;

[0058] 0.01 - 0.1 wt% of pigment;

[0059] The balance is water.

[0060] In the present invention, the active digital printing sizing agent composition is prepared from raw materials including sodium alginate, sodium carboxymethylcellulose, modified carboxymethylcellulose ether, aqueous nano - cellulose solution, urea, sodium bicarbonate, sodium hexametaphosphate, anti - staining salt, defoamer, pigment and water, and is preferably prepared from sodium alginate, sodium carboxymethylcellulose, modified carboxymethylcellulose ether, aqueous nano - cellulose solution, urea, sodium bicarbonate, sodium hexametaphosphate, anti - staining salt, defoamer, pigment and water. The present invention has no special limitation on the sources of the above - mentioned raw materials, and commercially available products well - known to those skilled in the art can be used; among them, the water is preferably deionized water.

[0061] In the present invention, the modified carboxymethylcellulose ether is a chemical substance widely used in the industrial field, and those skilled in the art can obtain this raw material without doubt according to this name.

[0062] In the present invention, the nano - cellulose has the following molecular structure:

[0063] Basic structural unit:

[0064]

[0065] Specifically, for the aggregated state structure, see Figure 11 The nano - material. The addition of nano - cellulose can increase the viscosity of the sizing agent. To obtain a sizing agent with the same viscosity, the dosage of the paste powder can be reduced, thereby reducing the pressure of de - pasting during washing, further improving the fabric handle, saving the steps of handle finishing and the use of chemicals such as handle finishing agents, and at the same time saving the water consumption and energy consumption of soft post - finishing; for the schematic diagram, see Figure 12 .

[0066] In the present invention, the content of the aqueous nano - cellulose solution is preferably 0.5% - 2%, and more preferably 1%.

[0067] In the present invention, the dosage of urea is 10 - 25 wt%, preferably 10 - 20 wt%. If there is too much urea, the hygroscopicity is too strong, and it is easy to have a hanger rod mark on the back side of the fabric surface at the part where the fabric surface contacts the hanger rod in the steaming machine, resulting in a downgrade. Therefore, the dosage of urea and the sizing amount during sizing should be strictly controlled appropriately. If the sizing amount is too much, the fabric surface will turn yellow seriously after drying.

[0068] In the present invention, the dosage of baking soda is preferably between 1 - 3 wt%. If there is too much baking soda, the colors of cyan, rose red, and blue will become lighter, and the whiteness value will decrease. If there is too little baking soda, all the colors will become lighter.

[0069] In the present invention, the anti - staining salt is preferably sodium m - nitrobenzenesulfonate, which is an organic oxidant (weak oxidant). Its function is to prevent the dye from being damaged during steaming after printing. Those skilled in the art can obtain this raw material without doubt according to this name.

[0070] In the present invention, the pigment is preferably a water - soluble edible pigment; it can be one or a mixture of several pigments such as carmine, amaranth, indigo, brilliant blue, lemon yellow, etc. From the molecular formula, these edible pigments have no reactive activity and will not affect the color tone of the final fabric. They are only used to distinguish defects and prevent pulling dry pulp.

[0071] Molecular formula of carmine:

[0072]

[0073] Molecular formula of indigo:

[0074]

[0075] Molecular formula of lemon yellow:

[0076]

[0077] In the present invention, the addition of edible pigment is to avoid the defective fabric of pulling dry pulp caused by the lack of sizing material in the sizing tank during sizing, and it can also visually detect the uneven sizing of the left, middle, and right parts in time to adjust the pressure of the left, middle, and right pressure rollers to ensure uniform sizing, strictly control the quality of the production process, and achieve process - controllable and visual management of quality. Edible pigment is a kind of food additive, an edible dye used to improve the appearance of items; it is commonly used for dyeing food products, beverages, drugs, lipsticks, and cosmetics. The edible pigment here has no reactive activity with the fiber and is only used to distinguish defects and prevent pulling dry pulp.

[0078] In the present invention, the active digital printing sizing agent composition is preferably prepared from the following raw materials:

[0079] Sodium alginate 25 - 30 wt%;

[0080] Sodium carboxymethyl cellulose 5-7 wt%;

[0081] Modified carboxymethyl cellulose ether 5-7 wt%;

[0082] Aqueous solution of nanocellulose 10-15 wt%;

[0083] Urea 10-20 wt%;

[0084] Sodium bicarbonate 1-3 wt%;

[0085] Sodium hexametaphosphate 0.4-0.6 wt%;

[0086] Resist salt 1.5-2 wt%;

[0087] Defoamer 0.04-0.06 wt%;

[0088] Pigment 0.01-0.02 wt%;

[0089] The balance is water.

[0090] The reactive digital printing sizing agent composition provided by the present invention adopts components with specific contents to achieve good overall interaction. By adding nanocellulose, the viscosity of the sizing agent is increased, and the dosage of paste powder can be reduced to obtain a sizing agent with the same viscosity, thereby reducing the pressure of de-pasting during washing, further improving the fabric hand feeling, saving the steps of hand feeling finishing, saving the use of chemicals such as hand feeling finishing agents, and saving the water consumption and energy consumption of soft post-finishing. It is particularly suitable for reactive digital printing.

[0091] The present invention also provides a preparation method of the reactive digital printing sizing agent composition described in the above technical solution, comprising the following steps:

[0092] Mix sodium alginate, sodium carboxymethyl cellulose, modified carboxymethyl cellulose ether, aqueous solution of nanocellulose, urea, sodium bicarbonate, sodium hexametaphosphate, resist salt, defoamer, pigment and water, and then filter and stand to obtain the reactive digital printing sizing agent composition.

[0093] In the present invention, the sodium alginate, sodium carboxymethyl cellulose, modified carboxymethyl cellulose ether, aqueous solution of nanocellulose, urea, sodium bicarbonate, sodium hexametaphosphate, resist salt, defoamer, pigment and water are the same as those in the above technical solution and will not be elaborated here.

[0094] In the present invention, the mixing process is preferably specifically:

[0095] Successively stir each raw material at low speed and high speed to complete the mixing process.

[0096] In the present invention, the speed of the low-speed stirring is preferably 10 to 20 r / min, and the time is preferably 15 to 20 min; the speed of the high-speed stirring is preferably 40 to 60 r / min, and the time is preferably 30 to 35 min.

[0097] In the present invention, the mesh size of the filtration is preferably 100 to 400 meshes, more preferably 200 to 300 meshes.

[0098] In the present invention, the standing time is preferably 1 to 4 hours, more preferably 2 to 3 hours, to achieve a defoaming effect.

[0099] The preparation method provided by the invention has simple process, mild and easy-to-control conditions, and readily available raw materials with low cost, and has broad application prospects.

[0100] The present invention also provides a digital printing process, comprising the following steps:

[0101] The fabric is sizing by using a reactive digital printing sizing agent and a padding process, and then digitally printed, and then sequentially dried, steamed, washed, and ironed to obtain a fabric;

[0102] The reactive digital printing sizing agent is the reactive digital printing sizing agent composition described in the above technical scheme; the sizing agent composition prepared by the above technical scheme is pumped into the rolling groove of the tentering machine by a circulating pump, and the grey cloth that has undergone conventional pretreatment passes through the rolling groove to roll the sizing agent onto the cloth surface, and the grey cloth enters the drying chamber at 105°C for drying and rolling before being used for digital printing.

[0103] In the present invention, the digital printing process specifically includes the following steps:

[0104] According to the general active digital printing sizing agent setting and padding process (padder pressure 2-3 kg, liquid rate 60%, setting machine temperature 110-120°C; the set temperature should not be too high, the temperature above 130°C is prone to cloth clamping or yellowing of the cloth surface, affecting the subsequent printing effect. It is only necessary to ensure that the fabric is completely dried. The temperature design of each section of the setting machine is shown in the following table) sizing, according to the process of padding digital base sizing (sizing, one dip and one padding) → digital printing → drying (100°C, 5min) → steaming (101°C, 10min) → cold water washing 1 time for 1min → hot water washing 1-2min (white anti-fouling soap detergent DT-ZX., 2g / L) → cold water washing 1-2min 3 times → ironing, digital printing is carried out, and the obtained fabric has high color yield, soft feel, bright color and high color fastness.

[0105]

[0106] The present invention provides an active digital printing sizing agent containing nanocellulose and a preparation and use method thereof, which has the following beneficial effects:

[0107] (1) The addition of nanocellulose increases the viscosity of the sizing agent. To obtain a sizing agent with the same viscosity, the dosage of paste powder can be reduced; the pressure of de-sizing during water washing is alleviated, further improving the fabric handle and saving the steps of handle finishing and the use of chemicals such as handle finishing agents; the water consumption and energy consumption of soft post-finishing are saved.

[0108] (2) The addition of food coloring avoids the defective fabric of dried slurry caused by the lack of sizing agent in the sizing tank during sizing, and can also timely detect the uneven sizing of the left, middle and right parts visually and adjust the pressure of the left, middle and right pressure rollers in time to ensure uniform sizing, strictly control the quality of the production process, make the process quality controllable, and conduct quality management visually; food coloring is a kind of food additive and has no reactive activity with fibers, but can effectively identify defects and sizing uniformity and prevent dried slurry.

[0109] (3) The fabric has a soft handle, and the addition of chemical agents such as softeners in post-finishing is reduced, which is low-carbon, green and environmentally friendly.

[0110] (4) The color yield of the fabric increases by 1.5%, the color is deeper, and the use cost of ink is reduced.

[0111] (5) The addition of nanocellulose increases the viscosity of the sizing agent and improves the fineness of the pattern.

[0112] (6) Solve the problem of hanger rod marks on the fabric during steaming of special fibers.

[0113] The present invention provides an active digital printing sizing agent composition, which is prepared from raw materials including the following components: sodium alginate 20-65 wt%; sodium carboxymethylcellulose 1-10 wt%; modified carboxymethylcellulose ether 1-10 wt%; aqueous solution of nanocellulose 10-20 wt%; urea 10-25 wt%; sodium bicarbonate 1-3 wt%; sodium hexametaphosphate 0.1-1 wt%; anti-dyeing salt 1-3 wt%; defoaming agent 0.01-0.1 wt%; pigment 0.01-0.1 wt%; and the balance is water. Compared with the prior art, the active digital printing sizing agent composition provided by the present invention adopts components with specific contents to achieve better overall interaction. By adding nanocellulose, the viscosity of the sizing agent is increased. To obtain a sizing agent with the same viscosity, the dosage of paste powder can be reduced, thereby alleviating the pressure of de-sizing during water washing, further improving the fabric handle, saving the steps of handle finishing and the use of chemicals such as handle finishing agents, and saving the water consumption and energy consumption of soft post-finishing. It is particularly suitable for active digital printing.

[0114] In addition, the preparation method provided by the present invention has simple process, mild and easy-to-control conditions, easily available raw materials and low cost, and has broad application prospects.

[0115] To further illustrate the present invention, the following detailed description is provided through the following embodiments. All raw materials used in the following embodiments of the present invention are commercially available products; among them, the aqueous solution of nanocellulose is Ningbo Sugar Poly Nanocellulose (1% solid content) MZ-C02B001-300, provided by Ningbo Sugar Poly New Materials Technology Co., Ltd.

[0116] Examples and Comparative Examples

[0117] As shown in Table 1, Table 1 shows the composition and ratio of the reactive digital printing sizing agent composition provided by the examples and comparative examples.

[0118] Table 1

[0119]

[0120]

[0121] Calculate and accurately weigh the weights of each component according to the above formula table, and prepare the sizing agent according to the following steps:

[0122] Prepare equipment and raw materials related to the production of reactive sizing agent, such as: electronic scale, material bucket, label, trailer, etc.; accurately calculate and weigh various raw materials in the formula and reserve the cleaned stirrer and reaction kettle barrel, etc.

[0123] Add the total amount of deionized water required that has been weighed into the chemical material bucket; then, slowly add the weighed baking soda, urea, anti-reducing agent, sodium hexametaphosphate, defoaming agent, food coloring and other auxiliary materials to the bucket under low-speed stirring (to prevent excessive foaming) and stir until completely dissolved. Observe that there are no obvious bubbles; finally, slowly add the weighed paste powder and nanocellulose under stirring conditions, stir well for 30 - 35 min until uniform, stop stirring, filter through a 200 - 300 mesh sieve, and let stand for 2 - 3 h until there are no bubbles, then put it into a ton bucket for digital printing use; the specific condition parameters are as follows:

[0124] Stir at low speed (15 r / min) for 15 - 20 min, then stir at high speed (50 r / min) for 30 - 35 min, and finally filter through a 200 - 300 mesh filter screen and let stand for 2 - 3 h until the bubbles disappear, package for use. See the overall flow chart in Figure 1 as shown.

[0125] Application Example

[0126] For the setting and padding process, pad the digital base paste (the pressure of the padding calender is 2 - 3 kg, the liquor pickup rate is 60%, the speed is 25 minutes / meter, the temperature of the setting machine is 110 °C, one dip and one pad. See the physical diagram in Figure 2As shown in the figure), drying and coiling for later use → digital printing → drying (100°C, 5 min) → steam heating (105°C, 5 min) → cold water washing (room temperature 25°C) for 1 time, 2 min → hot water (95°C) washing for 1 min → cold water washing (room temperature 25°C) for 1 min (using white ground anti-staining soap DT-ZX., 2 g / L) → cold water (room temperature 25°C) washing for 3 times, each time for 1 - 2 min → drying or ironing → post-finishing, stentering and drying, and testing the color indexes as shown in Tables 2 - 4 below. For the physical pictures, please refer to Figures 3 - 8 。

[0127] Table 2

[0128]

[0129] The results show that taking the sample without adding nano-cellulose as the standard sample, the color data is as shown in the above table. Analyzing from the data △Ecmc = 0.54: When △E is between 0 and 1, the color difference cannot be distinguished by the naked eye. After adding the pigment, the color shade is not affected. When △E is between 0 and 1, the color difference cannot be distinguished by the naked eye. The final color shade color difference value is extremely small, and the computer determines "pass". Analyzing %STR-SUM = 104.42, %STR-SUM ≥ 100: The color becomes deeper.

[0130] Table 3

[0131]

[0132] The results show that taking the sample without adding nano-cellulose as the standard sample, the color data is as shown in the above table. Analyzing from the data △Ecmc = 0.43: When △E is between 0 and 1, the color difference cannot be distinguished by the naked eye. After adding the pigment, the color shade is not affected. When △E is between 0 and 1, the color difference cannot be distinguished by the naked eye. The final color shade color difference value is extremely small, and the computer determines "pass". Analyzing %STR-SUM = 105.7, %STR-SUM ≥ 100: The color becomes deeper.

[0133] Table 4

[0134]

[0135] The results show that taking the sample without adding nano-cellulose as the standard sample, the color data is as shown in the above table. Analyzing from the data △Ecmc = 0.60: When △E is between 0 and 1, the color difference cannot be distinguished by the naked eye. After adding the pigment, the color shade is not affected. When △E is between 0 and 1, the color difference cannot be distinguished by the naked eye. The final color shade color difference value is extremely small, and the computer determines "pass". Analyzing %STR-SUM = 101.3, %STR-SUM ≥ 100: The color of blue becomes deeper.

[0136] In summary, after adding 10% nano-fiber solution, the color of digital printed fabrics has a deepening effect.

[0137] Comparative Example 2-1 is different from Example 2 in that the amount of urea used is increased and the color yield of the fabric is increased, as shown in Table 5 below.

[0138] Table 5

[0139] Sample Name L* a* Comparative Example 2 - 1: 10% Urea 36.83 57.03 Sample Name DL* Da* Example 2: 15% Urea -0.99D -1.75G Comparative Example 2 - 2: 20% Urea -1.12D -1.59G

[0140] The larger the L* value, the lighter the color. L* = sample L* - standard sample L*. A positive L* value indicates that the sample has a lighter color than the standard sample, and a negative value indicates that the sample has a darker color than the standard sample. The larger the absolute value of the negative value, the greater the color yield. According to the above color yield data, the color yield order is Comparative Example 2-2 urea 20% > Example 2 urea 15% > Comparative Example 2-1 urea 10%. The physical diagram is as Figures 9 - 10 , and comprehensive explanation from the two figures shows that after the urea dosage is increased from 10% to 20%, the front color yield gradually increases, and after the urea dosage is increased to 20%, the front color yield increases.

[0141] Examples 3, Comparative Examples 3-1 and 3-2 are experiments on the change of the amount of baking soda used. The results are shown in Table 6 below; Table 6 shows the influence of the amount of baking soda used on the color depth of bamboo fiber * fabrics.

[0142] Table 6

[0143]

[0144] The results show that when the amount of baking soda used is 2%, the L* values of all 8 colors are the smallest and the colors become darker. When the amount of baking soda used is 1%, the L* values are the largest and the colors become lighter. When the amount of baking soda used is 3%, the L* values and the changes of the 8 colors are inconsistent, and the comprehensive color yield of the fabric cannot be simply analyzed. In actual applications, the experience of technicians is also needed to explore the change of color light to meet the color light requirements of customers and meet the requirements of the standard sample. Therefore, when the amount of baking soda used is 2%, the eight-color effect is the best.

[0145] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An active digital printing sizing agent composition, characterized in that, Prepared from raw materials comprising the following components: Sodium alginate 20 - 65 wt%; Sodium carboxymethyl cellulose 1 - 10 wt%; Modified carboxymethyl cellulose ether 1 - 10 wt%; Aqueous solution of nanocellulose 10 - 20 wt%; Urea 10 - 25 wt%; Sodium bicarbonate 1 - 3 wt%; Sodium hexametaphosphate 0.1 - 1 wt%; Resist salt 1 - 3 wt%; Defoamer 0.01 - 0.1 wt%; Pigment 0.01 - 0.1 wt%; Water in the balance.

2. The sizing agent composition for reactive digital printing according to claim 1, characterized in that The content of the aqueous solution of nanocellulose is 0.5% - 2%.

3. The sizing agent composition for reactive digital printing according to claim 1, characterized in that, The resist salt is sodium m-nitrobenzenesulfonate.

4. The sizing agent composition for reactive digital printing according to claim 1, characterized in that, The pigment is a water-soluble edible pigment.

5. A method for preparing the reactive digital printing sizing agent composition according to any one of claims 1 to 4, characterized in that, Including the following steps: After mixing sodium alginate, sodium carboxymethyl cellulose, modified carboxymethyl cellulose ether, aqueous solution of nanocellulose, urea, sodium bicarbonate, sodium hexametaphosphate, resist salt, defoamer, pigment and water, filter and then stand still in sequence to obtain an active digital printing sizing agent composition.

6. The preparation method according to claim 5, characterized in that, The specific process of the mixing is as follows: Each raw material is subjected to low-speed stirring and high-speed stirring in sequence to complete the mixing process.

7. The preparation method according to claim 6, characterized in that, The rotation speed of the low-speed stirring is 10 - 20 r / min and the time is 15 - 20 min; the rotation speed of the high-speed stirring is 40 - 60 r / min and the time is 30 - 35 min.

8. The preparation method according to claim 5, characterized in that, The mesh number of the filter screen for the filtering is 100 - 400 meshes.

9. The preparation method according to claim 5, characterized in that, The standing time is 1 - 4 h.

10. A digital printing process, characterized in that, Including the following steps: Sizing is carried out by using an active digital printing sizing agent setting padding process. After digital printing, dry, steam, wash with water and iron dry in sequence to obtain a fabric; The active digital printing sizing agent is the active digital printing sizing agent composition according to any one of claims 1 - 4.

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