Pigment printing color paste composition as well as preparation method and application thereof

Abstract

The invention provides a pigment printing paste composition as well as a preparation method and application thereof. The pigment printing paste composition is prepared from the following raw materials: 0.1-5 wt% of a coating; 1-4 wt% of a thickening agent; 5-30 wt% of an adhesive; 10-25 wt% of a nano cellulose aqueous solution; 1-3 wt% of an anti-clogging agent; 1-3 wt% of a cross-linking agent; 1-3 wt% of a hand feeling improver; and the balance water. Compared with the prior art, the pigment printing color paste composition provided by the invention adopts the components with specific contents, realizes better overall interaction, and can reduce the consumption of the thickening agent to obtain the color paste with the same viscosity by adding the nano cellulose to increase the viscosity of the color paste, thereby further improving the hand feeling of fabrics and improving the color fastness of the fabrics. The use of chemicals such as a hand feeling finishing agent in the hand feeling finishing step is saved; meanwhile, water consumption and energy consumption of softening after-finishing are reduced, the composition is used for pigment printing, and the obtained pigment printing fabric is soft in hand feeling, bright in color and high in color fastness.

Description

Technical Field

[0001] The present invention relates to the technical field of pigment printing, and more specifically, to a pigment printing color paste composition, a preparation method thereof, and an application thereof. Background Art

[0002] Pigment printing is a printing method that uses a high-molecular compound as an adhesive to mechanically adhere pigments to a fabric, and obtains a transparent resin pattern with certain elasticity, wear resistance, resistance to hand rubbing, and resistance to wrinkles after post-treatment. The mechanism by which the pigment is fixed on the fiber is that the adhesive forms a firm and colorless transparent film on the fabric, and mechanically covers the pigment on the fabric. Therefore, pigment printing is applicable to most fibers, has a simple process, and a good printing effect. However, the hand feeling of the pigment-printed fabric obtained by the prior art is not good.

[0003] Nanocellulose is a nano-scale product obtained by treating cellulose fibers. Nanocellulose is a nano-scale fiber formed by chemically or physically treating plant cellulose, and its diameter is usually between a few nanometers and several hundred nanometers. It has high strength, a high specific surface area, and good biocompatibility. Since the hydroxyl group at the equatorial position of the pyranose ring in the nanocellulose chain is hydrophilic, while the C—H bond at the axial position of the cellulose is hydrophobic, nanocellulose has amphiphilicity and is a kind of nanoparticle widely used to stabilize Pickering emulsions. It is a green, non-toxic, abundant and renewable resource, and nanocellulose is suitable for stabilizing oil-in-water Pickering emulsions.

[0004] For example, Chinese Patent CN185400538A discloses a printing color paste composition for pigment printing of cotton and linen fiber fabrics. A printing color paste composition includes the following preparation raw materials by mass: 15-25% of inorganic colored pigments, 5-10% of fillers, 2-4% of nanomaterials, 2-4% of dispersants, 2-4% of chitosan, 3-5% of vinyl monomers containing amide groups, 3-6% of crosslinking agents, 6-13% of fabric adhesives, 3-5% of thickeners, 0.2-0.5% of mineral elements, 0.2-3% of pH regulators, and the balance of water. The finished product has stable properties and is easy to store. Moreover, for the cotton and linen fiber fabrics printed with the printing color paste composition of this invention, their water washing resistance and sorption rate are significantly enhanced, and the printing is smooth, the color is bright, the coloring depth is appropriate, it is not easy to fade, and the rubbing fastness after printing is high. However, there is no improvement in the pretreatment of the grey cloth and the printing process in this patent, and the performance of the obtained finished product still needs to be improved. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a pigment printing paste composition, a preparation method and an application thereof. The pigment printing paste composition provided by the present invention is used for pigment printing, and the obtained pigment printed fabric has a soft handfeel, bright color and high color fastness.

[0006] The present invention provides a pigment printing paste composition, which is prepared from raw materials comprising the following components:

[0007] Pigment 0.1-5 wt%;

[0008] Thickener 1-4 wt%;

[0009] Binder 5-30 wt%;

[0010] Aqueous nano-cellulose solution 10-25 wt%;

[0011] Anti-clogging agent 1-3 wt%;

[0012] Crosslinking agent 1-3 wt%;

[0013] Handfeel improver 1-3 wt%;

[0014] Water in the balance.

[0015] Preferably, the content of the aqueous nano-cellulose solution is 0.5%-2%.

[0016] Preferably, the thickener is a polyacrylate or polyurethane-based polymer copolymer.

[0017] Preferably, the binder is a self-crosslinking binder or an externally added crosslinking type binder.

[0018] Preferably, the anti-clogging agent is selected from one or more of urea moisture-absorbing compounds, glycerol moisturizing substances, silicone elastomer lubricating substances, and ammonia water substances for adjusting the pH value to alkaline.

[0019] Preferably, the crosslinking agent is selected from one or more of fixing agents, bridging agents, and aqueous polyurethane-based synthetic polymer crosslinking agents containing epoxyethyl, aziridinyl, acrylamide or hydroxymethylamide groups.

[0020] The present invention also provides a preparation method of the pigment printing paste composition according to the above technical solution, comprising the following steps:

[0021] Mix the pigment, thickener, binder, anti-clogging agent, crosslinking agent, handfeel improver and water for the first time to obtain a first paste;

[0022] Mix the first paste with the aqueous nano-cellulose solution for the second time to obtain the pigment printing paste composition.

[0023] Preferably, the temperature of the first mixing is 25 - 35°C, the rotation speed is 700 - 800 rpm, and the stirring time is 5 - 15 min;

[0024] The temperature of the second mixing is 25 - 35°C, the rotation speed is 700 - 800 rpm, and the stirring time is 5 - 15 min.

[0025] The present invention also provides a pigment printing process, and the color paste for pigment printing adopts the pigment printing color paste composition described in the above technical solution.

[0026] Preferably, it includes the following steps:

[0027] After the pretreatment of the grey fabric, pigment printing is carried out, and finally, stentering and setting are performed to obtain a pigment printed fabric.

[0028] The present invention provides a pigment printing color paste composition, its preparation method and application; the pigment printing color paste composition is prepared from raw materials including the following components: pigment 0.1 - 5 wt%; thickener 1 - 4 wt%; binder 5 - 30 wt%; nano - cellulose aqueous solution 10 - 25 wt%; anti - clogging agent 1 - 3 wt%; cross - linker 1 - 3 wt%; hand - feeling improver 1 - 3 wt%; and the balance is water. Compared with the prior art, the pigment printing color paste composition provided by the present invention adopts components with specific contents to achieve good overall interaction. By adding nano - cellulose, the viscosity of the color paste is increased, and the dosage of the thickener can be reduced to obtain a color paste with the same viscosity, thereby further improving the hand - feeling of the fabric and saving the use of chemicals such as hand - feeling finishing agents in the hand - feeling finishing step; at the same time, the water consumption and energy consumption in the softening post - finishing are saved. The composition of the present invention is used for pigment printing, and the obtained pigment printed fabric has a soft hand - feeling, bright color, and high color fastness.

[0029] 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. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the aggregated structure of nano - cellulose;

[0031] Figure 2 It is a schematic diagram of the reaction fixation of the binder in pigment printing;

[0032] Figure 3 It is the molecular formula of organosilicon. Detailed Embodiments

[0033] Next, in combination with the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention provides a pigment printing paste composition, which is prepared from raw materials including the following components:

[0035] Pigment 0.1 - 5 wt%;

[0036] Thickener 1 - 4 wt%;

[0037] Binder 5 - 30 wt%;

[0038] Aqueous solution of nanocellulose 10 - 25 wt%;

[0039] Anti - clogging agent 1 - 3 wt%;

[0040] Cross - linker 1 - 3 wt%;

[0041] Hand feeling improver 1 - 3 wt%;

[0042] Water the balance.

[0043] In the present invention, the pigment printing paste composition is prepared from raw materials including pigment, thickener, binder, aqueous solution of nanocellulose, anti - clogging agent, cross - linker, hand feeling improver and water, and is preferably prepared from pigment, thickener, binder, aqueous solution of nanocellulose, anti - clogging agent, cross - linker, hand feeling improver and water. The present invention has no special restrictions 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.

[0044] In the present invention, the pigment is preferably DyStar, K - BC, etc., or T - M black of Archroma (China) Co., Ltd., or Yagesu gray BF - 2L of Shanghai Yayun Textile Chemical Co., Ltd.

[0045] In the present invention, the nanocellulose has the following molecular structure:

[0046] Basic structural unit:

[0047]

[0048] Specifically, the aggregated state structure is shown in Figure 1For the nanomaterials, the addition of nanocellulose can increase the viscosity of the color paste. To obtain a color paste with the same viscosity, the amount of thickener can be reduced, which further improves the fabric handle, saves the steps of handle finishing, and reduces the use of chemicals such as handle finishing agents. At the same time, it saves water consumption and energy consumption in soft post-finishing.

[0049] In the present invention, the content of the aqueous nanocellulose solution is preferably 0.5% - 2%, more preferably 1%.

[0050] In the present invention, the thickener is preferably a polyacrylate or polyurethane-based polymer copolymer; the binder is preferably a self-crosslinking binder or an externally crosslinked binder; the binder can also be a polyacrylonitrile-based or polyurethane-modified polyacrylate-based copolymer binder. The thickener is preferably HIT (BASF (China) Co., Ltd.), thickener HY-8100 (Zhejiang Liansheng New Materials Co., Ltd.), and the binder is preferably 8602 (Zhejiang Liansheng New Materials Co., Ltd.), 101 (Shanghai Yuhui Chemical Co., Ltd.), HF-1801R, and HF-1901 (Anhui Polymer Radiation Chemical Co., Ltd.).

[0051] In the present invention, for the schematic diagram of the reactive fixation of the binder in pigment printing, see Figure 2 as shown.

[0052] In the present invention, the anti-screen clogging agent is preferably selected from one or more of urea moisture-absorbing compounds, glycerol moisturizing substances, silicone elastomer lubricating substances, and ammonia water substances for adjusting the pH value to alkaline; it mainly functions to absorb moisture, moisturize, lubricate, and prevent premature crosslinking of the binder, preventing screen clogging. For example, Figure 2 Regarding the binder reaction principle, the macromolecular substances in the binder mainly crosslink under acidic conditions. Therefore, adding ammonia water substances for adjusting viscosity is very effective for anti-screen clogging, which destroys the external environment of the binder crosslinking. When baking, the ammonia volatilizes without affecting the fastness of the binder film and the color fastness of pigment printing.

[0053] In the present invention, the dosage of the moisture-absorbing and moisturizing anti-screen clogging agent is preferably 1 - 3 wt%. If the dosage is too much, it will affect the film-forming fastness of the binder macromolecules, resulting in a decrease in the rubbing fastness of the fabric. If the dosage is too little, it will not play the role of anti-screen clogging.

[0054] In the present invention, the compound reactive groups containing at least two reactive groups in the crosslinking agent molecule are preferably selected from one or more of oxirane-based, cyclohexane-based, acrylamide-based or hydroxymethylamide-based color fixing agents, bridging agents, and waterborne polyurethane (WPU)-based synthetic polymer crosslinking agents. The crosslinking agent reacts with both the fiber and the adhesive. The function of the crosslinking agent is to form chemical bonds between linear molecules, so that the linear molecules are connected to each other to form a network structure, thereby improving the strength and elasticity of the film; specifically, it can be crosslinking agent SE (Yuyue Home Textile Co., Ltd., industrial grade).

[0055] In the present invention, when the waterborne polyurethane (WPU) crosslinking agent is used as a crosslinking agent for paint printing, the -N=C=O group released after unblocking reacts with the active groups (such as hydroxyl groups, amino groups, etc.) in the acrylic adhesive copolymer to crosslink the linear copolymer into a polymer with a three-dimensional network structure. Specifically, it can be crosslinking agent SE (Yuyue Home Textile Co., Ltd., industrial grade) or TCM-1 (Zhejiang Liansheng New Materials Co., Ltd.).

[0056] In the present invention, the feel modifier is preferably a silicone elastomer, see Figure 3 ; Silicone elastomer is a silicon-containing polymer material with different network cross-linking structures. Figure 3 The main chain of the structure is composed of siloxane, and the high molecular polymer whose side groups are connected to organic groups through silicon is called organopolysiloxane. The hand feel improver refers to a softener, which is generally a silicone softener or a polyethylene wax smoothing agent. Specifically, Zhejiang Liansheng New Materials Co., Ltd. can provide yarn smoothing agent 600D softener, 6843 softener 6631 film V16, etc.

[0057] In the present invention, the pigment printing paste composition is preferably prepared from the following raw materials:

[0058] Coating 2-4wt%;

[0059] Thickener 2-2.5wt%;

[0060] Adhesive 15-20wt%;

[0061] Nanocellulose aqueous solution 15-20wt%;

[0062] Anti-clogging agent 1.5-2wt%;

[0063] Crosslinking agent 1.5-2wt%;

[0064] Hand feel improver 1.5-2wt%;

[0065] Water balance.

[0066] The coating printing color paste composition provided by the present invention adopts components with specific contents to achieve good overall interaction. By adding nanocellulose, the viscosity of the color paste is increased, and the dosage of the thickener can be reduced to obtain a color paste with the same viscosity, thereby further improving the fabric hand feeling, saving the steps of hand feeling finishing and the use of chemicals such as hand feeling finishing agents; at the same time, the water consumption and energy consumption of soft after-finishing are saved. The coating printing color paste composition of this patent is used for coating printing, and the obtained coating printed fabric has a soft hand feeling, bright colors, and high color fastness.

[0067] The present invention also provides a preparation method of the coating printing color paste composition described in the above technical solution, including the following steps:

[0068] First, mix the coating, thickener, binder, anti-clogging agent, crosslinking agent, hand feeling improver and water to obtain the first color paste;

[0069] Then, mix the first color paste with the nanocellulose aqueous solution for the second time to obtain the coating printing color paste composition.

[0070] In the present invention, the coating, thickener, binder, nanocellulose aqueous solution, anti-clogging agent, crosslinking agent, hand feeling improver and water are the same as those in the above technical solution, and will not be elaborated here.

[0071] In the present invention, the temperature of the first mixing is preferably 25 - 35°C, the rotation speed is preferably 700 - 800 rpm, and the stirring time is preferably 5 - 15 min; the temperature of the second mixing is preferably 25 - 35°C, the rotation speed is preferably 700 - 800 rpm, and the stirring time is preferably 5 - 15 min.

[0072] 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.

[0073] The present invention also provides a coating printing process, and the color paste for coating printing adopts the coating printing color paste composition described in the above technical solution.

[0074] In the present invention, the coating printing process preferably includes the following steps:

[0075] After pre-treating the grey fabric, perform coating printing, and finally carry out stentering and setting to obtain the coating printed fabric.

[0076] In the present invention, the pre-treatment of the grey fabric: singeing → cold pad-batch (21 - 23 h); the coating printing: magnetic force 3 - 7 V, speed 1 - 5 mm / s, then drying (in an oven at 80 - 100°C) and curing (at 140 - 165°C for 30 - 60 s) to obtain the coating printed fabric.

[0077] In the present invention, the viscosity of the pigment printing paste is preferably 30,000 - 40,000 mPa·S (test data of No. 4 rotor of NDJ5S viscometer); the drying method is preferably hot air drying or infrared drying at a temperature of 100 - 120 °C; the curing temperature is preferably 140 - 165 °C, and curing is carried out to obtain a pigment printed fabric with high rubbing fastness.

[0078] In the present invention, for post-finishing, padding with a finishing solution, the liquor ratio is preferably 60 - 80%, pre-drying, and curing. The finishing solution includes an amino silicone softener. The post-finishing setting temperature is preferably 140 - 170 °C, and the time is preferably 30 - 60 s. The temperature settings of each drying chamber of the stentering machine are as shown in the following table.

[0079]

[0080] Therefore, in the present invention, from the development of the pretreatment process by introducing ozone treatment to enhance desizing, preferably using a high-fastness soft binder, adding nano-cellulose, adding silicone elastomer and other paste components to develop the printing paste, and in terms of soft finishing, on the premise of ensuring the fastness index of the fabric, the hand feeling is improved to obtain a pigment printed fabric with a soft hand feeling.

[0081] The present invention provides a pigment printing paste composition, its preparation method and application; the pigment printing paste composition is prepared from raw materials including the following components: pigment 0.1 - 5 wt%; thickener 1 - 4 wt%; binder 5 - 30 wt%; nano-cellulose aqueous solution 10 - 25 wt%; anti-clogging agent 1 - 3 wt%; cross-linking agent 1 - 3 wt%; hand feeling improver 1 - 3 wt%; and the balance is water. Compared with the prior art, the pigment printing paste composition provided by the present invention adopts components with specific contents to achieve good overall interaction. By adding nano-cellulose, the viscosity of the paste is increased, and the amount of thickener can be reduced to obtain a paste with the same viscosity, thereby further improving the hand feeling of the fabric, saving the steps of hand feeling finishing and the use of chemicals such as hand feeling finishing agents; at the same time, it saves the water consumption and energy consumption of soft post-finishing. When used for pigment printing, the obtained pigment printed fabric has a soft hand feeling, bright color, and high color fastness.

[0082] 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.

[0083] In order to further illustrate the present invention, the following examples are used for detailed description. The raw materials used in the following examples of the present invention are all commercially available products; among them, the nano-cellulose aqueous solution is Ningbo Sugar Poly Nano-Cellulose (1% solid content) MZ-C02B001-300, provided by Ningbo Sugar Poly New Materials Technology Co., Ltd.

[0084] (1) Pretreatment of grey fabric: Singeing → Cold pad-batch (21 - 23 h) ozone treatment → Scouring, bleaching → Weft straightening → (2) Printing (magnetic bar printing small sample machine, Yu Yue Home Textiles Co., Ltd., magnetic force 3 - 7 V, speed 1 - 5 mm / s, 8# magnetic bar, 120 - mesh flat screen, fabric C40*40, 133*72) → Drying (oven at 100 - 105 °C) → Heat curing (140 - 165 °C, 30 - 60 s) → (3) Stentering and setting, and the obtained fabric has high color yield, soft handfeel, bright color and high color fastness.

[0085] The specific steps are as follows:

[0086] (1) Pretreatment of grey fabric: Singeing → Cold pad-batch (21 - 23 h) → Desizing, scouring and bleaching with combined ozone technology:

[0087] 1. Singeing: Vehicle speed 110 m / min, singeing through in one positive and one negative direction, air pressure 1.2 MPa.

[0088] 2. Cold pad-batch: Stack at room temperature for 21 - 23 h.

[0089] The formula of the cold pad-batch working solution is shown in the following table.

[0090] 3. Ozone treatment process: Vehicle speed 50 m / min, ozone mass concentration 20 g / m 3 ; Treat at room temperature.

[0091] The formula of the ozone treatment working solution is shown in the following table.

[0092] Formula table of cold pad-batch working solution

[0093]

[0094]

[0095] Among them, scouring agent A is a surfactant substance, and its main component is polyol ether derivative. It is a non-ionic, APEO-free, silicon-free and solvent-free high-efficiency scouring agent with strong wetting, emulsifying and washing functions in alkaline medium and low foam.

[0096] 4. The formula of the scouring and bleaching working solution is shown in the following table: Vehicle speed 100 m / min, scouring temperature 98 °C, time 6 h.

[0097] Formula table of ozone treatment (scouring - bleaching - dechlorination) working solution

[0098]

[0099] Among them, scouring agent B is a surfactant substance, and its main components are a compound of sodium alkyl sulfonate, octylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, washing assistant, etc.; scouring agent C is a surfactant substance, a phosphorus-free multi-functional scouring agent, and its main components are a compound of sodium alkyl sulfonate, octylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, washing assistant, etc.

[0100] Scouring agent A, scouring agent B, scouring agent C (Joy Home Textiles Co., Ltd.), sodium hypochlorite, sodium thiosulfate, hydrogen peroxide (30%), cold pad-batch king, scouring enzyme, hydrogen peroxide stabilizer, chelating dispersant (all of the above drugs are industrial grade); Equipment: narrow-width gas singeing machine, OT-4 + 2 / 3200 type ozone treatment machine, loose rope continuous desizing, scouring and bleaching machine, stenter, magnetic bar scraping sample machine, steaming machine (Joy Home Textiles Co., Ltd.), Datacolor850 color measurement and matching instrument (Datacolor Company), electrothermal constant temperature forced air drying oven (Shanghai Yiheng Scientific Instruments), dyeing rubbing fastness tester (Nantong Hongda Instrument Company), electronic balance (Shanghai Shunyu Hengping Scientific Instruments Co., Ltd.).

[0101] Scouring enzyme DT-E25, the main components of cold pad-batch king are sodium silicate water glass and a mixture of Guigou dispersant maleic anhydride copolymer 2 and PMA-100, hydrogen peroxide stabilizer MPT (all of the above are from Joy Home Textiles Co., Ltd., industrial grade);

[0102] Chelating dispersant TX-908 is from Qingdao Fukai Rubber Element New Materials Co., Ltd., industrial grade;

[0103] Chelating dispersants LS710 / LS720 are from Zhejiang Liansheng New Materials Co., Ltd., industrial grade.

[0104] Examples and comparative examples

[0105] Table 1 shows the composition and ratio of the pigment printing paste composition provided in Example 1 and Comparative Example 1.

[0106] Table 1 Composition and ratio of the pigment printing paste composition provided in Example 1 and Comparative Example 1

[0107]

[0108] Calculate and accurately weigh the weights of each component according to the above formula table, and prepare the printing paste according to the following steps for pigment printing:

[0109] Prepare printing paste A → Prepare printing paste B → Pigment printing (22 mm / s, 5 V pressure, 8# magnetic bar, 120-mesh flat screen, fabric C40*40, 133*72) → Post-finishing with softener → Drying (85 ± 5 °C, 5 min) → Baking (165 ± 5 °C, 1.5 min) to obtain the pigment printed fabric.

[0110] (1) Preparation of printing paste A: Weigh the materials according to the formulations of the examples and comparative examples in the above table, put them into a beaker and stir evenly; the temperature is room temperature of 25 - 35 °C, the rotation speed is 700 - 800 rpm, and the stirring time is 5 - 15 min.

[0111] (2) Preparation of printing paste B: Add an aqueous solution of nanocellulose with a solid content of 1% to printing paste A and stir evenly (; the temperature is room temperature of 25 - 35 °C, the rotation speed is 700 - 800 rpm, and the stirring time is 5 - 15 min), then measure the viscosities. The viscosities of Example 3 are 5300 mPa·S and that of the comparative example is 31400 mPa·S (test data with a No. 4 rotor of NDJ5S viscometer).

[0112] (3) Pigment printing: Pigment printing sample scraping machine (vehicle speed 22 mm / s, 5V pressure, 8# magnetic bar, 120 - mesh flat screen, fabric C40*40, 133*72) → (85 ± 5 °C, 5 min) → baking (165 ± 5 °C, 1.5 min).

[0113] (4) Post - finishing and softening: Immerse and pad the finishing solution with a liquor - pick - up rate of 75%. The softening finishing solution includes amino - silicone softener. Then carry out post - finishing and setting at a temperature of 160 °C for 40 s to obtain the pigment - printed fabric for testing. The indexes are shown in Table 2.

[0114] Table 2 Test index table of pigment - printed fabric

[0115]

[0116] Analysis of the data in the above table shows that: after adding the nanocellulose solution, the viscosity of the printing paste increases, and the PVI value decreases; under the same shear force, the amount of paste obtained increases, and the colors of yellow and blue printing pastes become darker. It has little effect on dry rubbing fastness and improves wet rubbing fastness (the addition of nanocellulose enhances the fastness of the binder film). Explanation: Printing viscosity index PVI value = η60r / η6r (η60r is the viscosity of the printing paste measured at 60 rpm, and η6rpm is the viscosity of the printing paste measured at 6 rpm). Generally speaking, a lower PVI value indicates that under the same shear force, the viscosity decreases rapidly, is easy to penetrate through the printing screen to reach the fabric surface, and the viscosity will increase again after the shear force is removed, and can stay at the printed part without penetrating to other parts of the fabric, which is very beneficial for obtaining a printed fabric with a higher color yield and clarity.

[0117] Examples 2 - 6

[0118] As the addition amount of nanocellulose increases (5 - 20%), the viscosity of the printing paste increases (29450 - 42000 mPa·S), the color yield (%STR - SUM = 0 - 118; △L = - 1.57) increases, and the dry and wet rubbing fastness first decreases and then increases. The results are shown in Table 3 below.

[0119] Table 3

[0120]

[0121]

[0122] Examples 7 - 11

[0123] With the increase in the addition amount of nanocellulose (5 - 20%), the viscosity of the color paste increases (from 254000 mPa·S to 28100 mPa·S), and the color yield (%STR - SUM = 0 - 106.9; △L = -0.94) increases. The dry and wet rubbing fastness is not significantly affected. The results are shown in Table 4 below.

[0124] Table 4

[0125]

[0126] In summary, the pigment printing color paste composition, its preparation method and application provided by the present invention have the following

[0127] Beneficial effects:

[0128] (1) The addition of nanocellulose increases the viscosity of the color paste. To obtain a color paste with the same viscosity, the amount of thickener can be reduced; further improves the hand feeling of the fabric, saves the steps of hand feeling finishing, and saves the use of chemicals such as hand feeling finishing agents; saves water consumption and energy consumption for soft post - finishing.

[0129] (2) The addition of the hand feeling regulator improves the hand feeling of the fabric, saves the steps of hand feeling finishing, and saves the use of chemicals such as hand feeling finishing agents; saves water consumption and energy consumption for soft post - finishing. The addition of the hand feeling regulator increases the lubrication degree of the surface of the binder film and improves the rubbing fastness.

[0130] (3) The hand feeling of the fabric is soft, the addition of chemical agents such as softening agents for post - finishing is reduced, which is low - carbon, green and environmentally friendly.

[0131] (4) The color yield of the fabric increases, the color is deeper, and the use cost of pigments is reduced.

[0132] (5) The addition of nanocellulose increases the viscosity of the color paste, improves the fineness of the pattern, and can print fine line patterns; broadens the variety of products produced and improves the product quality.

[0133] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pigment printing paste composition, characterized in that, Prepared from raw materials comprising the following components: Coating: 0.1 - 5 wt%; Thickener: 1 - 4 wt%; Binder: 5 - 30 wt%; Aqueous nano-cellulose solution: 10 - 25 wt%; Anti-clogging agent: 1 - 3 wt%; Cross-linking agent: 1 - 3 wt%; Hand feeling improver: 1 - 3 wt%; Water: the balance.

2. The pigment printing paste composition according to claim 1, characterized in that, The content of the aqueous nano-cellulose solution is 0.5% - 2%.

3. The pigment printing paste composition according to claim 1, characterized in that, The thickener is a polyacrylate or polyurethane-based polymer copolymer.

4. The pigment printing paste composition according to claim 1, characterized in that, The binder is a self-crosslinking binder or an externally added crosslinking type binder.

5. The pigment printing paste composition according to claim 1, wherein The anti-clogging agent is selected from one or more of urea hygroscopic compounds, glycerol moisturizing substances, silicone elastomer lubricating substances, and ammonia water substances for adjusting the pH value to alkaline.

6. The pigment printing paste composition according to claim 1, characterized in that, The cross-linking agent is selected from one or more of color fixatives, bridging agents, and aqueous polyurethane-based synthetic polymer cross-linking agents containing epoxyethyl groups, aziridinyl groups, acrylamide groups, or hydroxymethylamide groups.

7. A method for preparing the pigment printing paste composition according to any one of claims 1 to 6, characterized in that, Comprising the following steps: Perform the first mixing of the coating, thickener, binder, anti-clogging agent, cross-linking agent, hand feeling improver, and water to obtain the first color paste; Perform the second mixing of the first color paste with the aqueous nano-cellulose solution to obtain the coating printing color paste composition.

8. The preparation method according to claim 7, characterized in that, The temperature of the first mixing is 25 - 35°C, the rotation speed is 700 - 800 rpm, and the stirring time is 5 - 15 min; The temperature of the second mixing is 25 - 35°C, the rotation speed is 700 - 800 rpm, and the stirring time is 5 - 15 min.

9. A pigment printing process, characterized in that, The color paste for coating printing uses the coating printing color paste composition according to any one of claims 1 - 6.

10. The coating printing process according to claim 8, characterized in that, Comprising the following steps: After pre-treating the grey cloth, perform coating printing, and finally perform stentering and setting to obtain the coating printed fabric.

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