Organic hydrotalcite / polycarboxylic acid composite paste for printing of acrylic / rayon blended fabric with vat dyes, and preparation method and application thereof

Abstract

This invention relates to an organic hydrotalcite / polycarboxylate composite paste for vat dye printing on acrylic / viscose blended fabrics, its preparation method, and its application. The paste is prepared by the following method: First, an aqueous solution of polycarboxylate is prepared using acrylic acid, sodium methacrylate, methoxy polyethylene glycol methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid as raw materials; second, hydrotalcite is prepared by reacting magnesium nitrate, calcium nitrate, and aluminum nitrate; then, the hydrotalcite is reacted with sodium dodecyl sulfonate to prepare an organic hydrotalcite; finally, the aqueous solution of polycarboxylate is reacted with the organic hydrotalcite to obtain the organic hydrotalcite / polycarboxylate composite paste. The organic hydrotalcite / polycarboxylate composite paste prepared by this invention is used for vat dye printing on acrylic / viscose blended fabrics. The resulting printed fabric exhibits characteristics such as a desizing rate higher than 92%, good softness, high outline clarity, penetration rate higher than 82%, and high fastness to dry rubbing and washing, showing great application potential.

Description

Technical Field

[0001] This invention belongs to the field of paste preparation and application technology, specifically relating to organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics, its preparation method and application. Background Technology

[0002] Before being added to the printing paste, printing paste is generally a thick, hydrophilic polymer colloidal solution that is dissolved in water or fully swollen and dispersed in water, or an oil / water or water / oil emulsion paste. When preparing the printing paste, some dye dissolves in the water, while the remaining dye dissolves, is adsorbed, or dispersed in the printing paste. The printing paste is the main component of the printing paste, determining the printing performance, the amount of dye applied to the surface, and the smoothness of the pattern outline.

[0003] In the complex and ever-changing international textile trade competition, pure cotton products alone can no longer meet people's needs, and their prices are not competitive. To enhance the functionality and added value of cotton fabrics, substitutes for cotton and blends with other fibers have been developed. Viscose fiber is a cellulose fiber, and the properties of acrylic / viscose blended fabrics are very similar to those of pure cotton fabrics. However, the printing performance of acrylic / viscose blended fabrics for deep-dark printing with vat dyes has always been a focus of attention. Because acrylic and viscose are different fibers, the dyes and dyeing processes used for them differ significantly, which places higher demands on the printing of acrylic / viscose blended fabrics. Among the important factors affecting printing, the quality of the printing paste is particularly important.

[0004] Hydrotalcite is an anionic layered compound. Layered compounds are a class of compounds with a layered structure, interlayer ions, and exchangeability. Utilizing the intercalation capability of the main layered compound under the influence of strongly polar molecules and the exchangeability of interlayer ions, functional guest substances can be introduced into the interlayer voids, widening the gaps between the layers to form a columnar compound. The structural characteristics of hydrotalcite and its compounds allow their interlayer anions to exchange with various anions, including inorganic ions, organic ions, homologous ions, heteropolyacid ions, and anions from coordination compounds. This property of hydrotalcite and its compounds allows for the modulation of the types of interlayer anions to synthesize different types of hydrotalcite and endow them with different properties, thus obtaining a new class of materials with different functions. Since hydrotalcite does not have a fixed chemical composition, the elemental types and proportions of its main layers, the types and quantities of interlayer anions, and the two-dimensional pore structure can be modified over a wide range as needed, thereby obtaining materials with special structures and properties. The tunability of the composition and structure of hydrotalcite, and the resulting multifunctionality, makes hydrotalcite a new type of material with great research potential and application prospects, and it has great application potential in the field of pastes.

[0005] Polyacrylic acid-based synthetic thickeners are increasingly widely used pastes, and polycarboxylic acid is a polymer compound with a molecular structure similar to polyacrylic acid. Polycarboxylic acid is widely used in many fields, especially as a concrete additive, because it has strong dispersing properties; in addition, it also has adsorption and water-retention properties. These advantages of polycarboxylic acid make its application in the paste field possible.

[0006] Based on the structural characteristics of hydrotalcite and polycarboxylate, they have the potential to become pastes; if their properties are complementary, their application performance in the field of pastes can be further enhanced. Summary of the Invention

[0007] In view of the above-mentioned drawbacks in the prior art, the purpose of this invention is to provide an organic hydrotalcite / polycarboxylate composite paste for printing with vat dyes on acrylic / viscose blended fabrics, its preparation method and application.

[0008] The purpose of this invention is to provide an organic hydrotalcite / polycarboxylate composite paste for printing with vat dyes on acrylic / viscose blended fabrics. This paste is prepared by the following method: First, an aqueous solution of polycarboxylate is prepared using acrylic acid, sodium methacrylate, methoxy polyethylene glycol methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid as raw materials; second, hydrotalcite is prepared from magnesium nitrate, calcium nitrate, and aluminum nitrate; then, the hydrotalcite is reacted with sodium dodecyl sulfonate to obtain an organic hydrotalcite; finally, the aqueous solution of polycarboxylate is reacted with the organic hydrotalcite to obtain the organic hydrotalcite / polycarboxylate composite paste.

[0009] The purpose of this invention is to provide a method for preparing an organic hydrotalcite / polycarboxylate composite paste for vat dye printing on acrylic / viscose blended fabrics. The specific method includes the following steps:

[0010] (1) Preparation of polycarboxylic acid aqueous solution: Acrylic acid, sodium methacrylate, methoxy polyethylene glycol methacrylate and 2-acrylamide-2-methylpropanesulfonic acid are dissolved in an appropriate amount of distilled water to prepare a monomer solution. Ammonium persulfate is dissolved in distilled water to prepare an initiator solution. Then, under stirring conditions, the temperature is controlled at 79-81℃. The prepared monomer solution and ammonium persulfate initiator solution are added dropwise to a four-necked flask containing an appropriate amount of distilled water. The addition time is controlled at 2-3 hours. After the addition is completed, the temperature is kept for 3-4 hours. Finally, the solution is cooled to obtain the polycarboxylic acid aqueous solution.

[0011] Preferably, the ratio of acrylic acid (mL), sodium methacrylate (g), methoxy polyethylene glycol methacrylate (g), and 2-acrylamide-2-methylpropanesulfonic acid (g) is 1:1 to 3:10 to 30:1 to 3.

[0012] Preferably, the degree of polymerization of the methoxy polyethylene glycol methacrylate is n = 23 or 45.

[0013] Preferably, the volume ratio of the ammonium persulfate initiator solution to the monomer solution is 1:3-5; and the mass concentration of the ammonium persulfate initiator solution is 1-3%.

[0014] (2) Preparation of hydrotalcite: Magnesium nitrate, calcium nitrate and aluminum nitrate were dissolved in distilled water to prepare a mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate. Sodium carbonate, sodium oxalate and sodium bicarbonate were dissolved in distilled water to prepare a mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate. Under stirring conditions, the mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate was added dropwise to the mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate over a period of 2 to 4 hours. After the addition was completed, the pH of the reaction solution was adjusted to 10 to 11 with a 20 to 30 wt% sodium hydroxide aqueous solution. The reaction was stirred and the reaction temperature was adjusted to 50 to 70 °C for a reaction time of 3 to 5 hours. After the reaction was completed, the solution was filtered, washed with distilled water, and finally dried to obtain hydrotalcite.

[0015] Preferably, the ratio of magnesium nitrate (mol), calcium nitrate (mol), and aluminum nitrate (mol) to distilled water (mL) in the magnesium nitrate, calcium nitrate, and aluminum nitrate is 1:0.1-0.2:0.2-0.4:1000-1200; and the ratio of sodium carbonate (mol), sodium oxalate (mol), and sodium bicarbonate (mol) to distilled water (mL) is 1:0.1-0.2:1-2:1000-1200.

[0016] (3) Preparation of organic hydrotalcite: Sodium dodecyl sulfonate is dissolved in distilled water to prepare an aqueous solution of sodium dodecyl sulfonate with a mass fraction of 1-2%; the hydrotalcite prepared in step (2) is added to the aqueous solution of sodium dodecyl sulfonate, stirred and reacted, the reaction temperature is adjusted to 50-70℃, and the reaction time is 3-5 hours; after the reaction is completed, it is filtered; washed with distilled water, then dried, ground, and the ground powder is sieved through a 100-200 mesh sieve to obtain organic hydrotalcite.

[0017] Preferably, the ratio of the amount of hydrotalcite (g) prepared in step (2) to the aqueous solution of sodium dodecyl sulfonate (mL) is 1:10-12.

[0018] (4) Preparation of organic hydrotalcite / polycarboxylic acid composite paste: Add the polycarboxylic acid aqueous solution obtained in step (1) and the organic hydrotalcite obtained in step (3) to distilled water, stir to dissolve, adjust the reaction temperature to 40-60℃, and the reaction time to 3-5 hours. After the reaction is completed, spray dry to obtain powdered organic hydrotalcite / polycarboxylic acid composite paste.

[0019] Preferably, the ratio of the polycarboxylic acid aqueous solution (mL) obtained in step (1), the organic hydrotalcite (g) obtained in step (3), and the distilled water (mL) is 1:0.5-1.5:10-20.

[0020] Another objective of this invention is to provide an application of an organic hydrotalcite / polycarboxylate composite paste for printing with vat dyes on acrylic / viscose blended fabrics. The application method is as follows: weigh the dyes and chemicals according to the color paste formula, dissolve the vat dye in 10-20 mL of distilled water, then add the whitening agent and the remaining distilled water to the material in sequence, mix evenly and dissolve it; finally add the base paste, stir evenly, and obtain a color paste for printing with vat dyes on acrylic / viscose blended fabrics; print the obtained color paste on the acrylic / viscose blended fabric.

[0021] Preferably, the pigment paste formula is as follows: base paste: 26-28g; vat dye: 2.0-2.2g; styrax powder: 2-3g; water added to 100g.

[0022] Preferably, the base paste is the organic hydrotalcite / polycarboxylate composite paste for printing acrylic / viscose blended fabrics with vat dyes prepared according to the present invention; the vat dye is any one of CI vat yellow 2, CI vat red 29, CI vat blue 4, CI vat brown 1, CI vat black 25, and CI vat green 3.

[0023] Preferably, the printing process is as follows: flat screen printing (scraping once) → drying (100℃, 3min) → steaming (102℃, 10min) → rinsing twice with cold water → soaping → washing with cold water → drying.

[0024] The present invention has the following significant advantages:

[0025] (1) The inventors of this application unexpectedly discovered that combining hydrotalcite and polycarboxylic acid achieves complementary properties and enhances their application performance in the field of pastes.

[0026] (2) The organic hydrotalcite / polycarboxylic acid composite paste prepared by the present invention achieves the purpose of uniformly dispersing dyes and chemical auxiliaries in the colloidal system; and the viscosity of the paste changes little when diluted; in addition, the paste has a certain pressure permeability after being made into printing paste, and has moderate permeability to the fabric, so that the paste can penetrate into the fabric.

[0027] (3) The organic hydrotalcite / polycarboxylic acid composite paste prepared by the present invention is used for vat dye printing of acrylic / viscose blended fabrics. The printed fabrics produced have the advantages of a desizing rate of more than 92%, good softness, high outline clarity, penetration rate of more than 82%, and high dry rubbing fastness and soap washing fastness, and have good application prospects.

[0028] (4) The present invention uses an ion exchange method to exchange the interlayer anions of hydrotalcite with the anions in sodium dodecyl sulfonate, thereby obtaining modified organic hydrotalcite.

[0029] (5) The organic hydrotalcite / polycarboxylic acid composite paste prepared by the present invention contains more carboxylic acid groups and hydrophilic side chains, which significantly improves the wetting performance of the paste, that is, it can effectively wet the fabric. Detailed Implementation

[0030] The present invention is described in detail below with reference to the embodiments and comparative examples.

[0031] Main raw material sources: CI Reduced Black 25 was purchased from Jiangsu World Chemical Co., Ltd.; Printing paste SV-14 was purchased from Xiamen Anke Chemical Co., Ltd.; Methoxy polyethylene glycol methacrylate (degree of polymerization n=23 or 45) was purchased from Clariant Chemicals (China) Co., Ltd.

[0032] Example 1

[0033] A method for preparing an organic hydrotalcite / polycarboxylate composite paste for vat dye printing on acrylic / viscose blended fabrics, the specific method including the following steps:

[0034] (1) Preparation of polycarboxylic acid: 1 mL of acrylic acid, 2 g of sodium methacrylate, 20 g of methoxy polyethylene glycol methacrylate with a degree of polymerization of n=23 and 2 g of 2-acrylamide-2-methylpropanesulfonic acid were dissolved in 200 mL of distilled water to prepare a monomer solution. 1.0 g of ammonium persulfate was dissolved in 50 mL of distilled water to prepare an initiator solution. The solutions were then prepared by adding the monomer solution and the ammonium persulfate initiator solution dropwise to a four-necked flask containing 100 mL of distilled water under stirring conditions and a controlled temperature of 80 °C. The dropwise addition time was controlled at 2.5 h. After the addition was completed, the solution was kept at the temperature for 3.5 h. Finally, the solution was cooled to obtain an aqueous solution of polycarboxylic acid.

[0035] (2) Preparation of hydrotalcite: 1 mol magnesium nitrate, 0.15 mol calcium nitrate and 0.3 mol aluminum nitrate were dissolved in 1100 mL of deionized water to prepare a mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate. 1 mol sodium carbonate, 0.15 mol sodium oxalate and 1.5 mol sodium bicarbonate were dissolved in 1100 mL of deionized water to prepare a mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate. Under stirring conditions, the mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate was added dropwise to the mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate over a period of 3 hours. After the addition was complete, the pH of the reaction solution was adjusted to 10.5 with 25 wt% sodium hydroxide aqueous solution, the reaction was stirred, the reaction temperature was adjusted to 60℃, and the reaction time was 4 hours. After the reaction was completed, the solution was filtered, washed with deionized water, and finally dried to obtain hydrotalcite.

[0036] (3) Preparation of organic hydrotalcite: Sodium dodecyl sulfonate was dissolved in distilled water to prepare a sodium dodecyl sulfonate aqueous solution with a mass fraction of 1.5%; 10g of hydrotalcite prepared in step (2) was added to 110mL of sodium dodecyl sulfonate aqueous solution, stirred and reacted, the reaction temperature was adjusted to 60℃, and the reaction time was 4 hours; after the reaction was completed, it was filtered; washed with distilled water, then dried, ground, and the ground powder was sieved through a 150-mesh sieve to obtain organic hydrotalcite.

[0037] (4) Preparation of organic hydrotalcite / polycarboxylic acid composite paste: Add 10 mL of the polycarboxylic acid aqueous solution obtained in step (1) and 10 g of the organic hydrotalcite obtained in step (3) to 150 mL of distilled water, stir to dissolve, adjust the reaction temperature to 50℃, and the reaction time to 4 hours. After the reaction is completed, spray dry to obtain powdered organic hydrotalcite / polycarboxylic acid composite paste.

[0038] The application of organic hydrotalcite / polycarboxylate composite paste for printing on acrylic / viscose blended fabrics with vat dyes is described below. The method involves selecting the following color paste formula: 27g of the organic hydrotalcite / polycarboxylate composite paste prepared in this invention; 2.1g of vat dye CI Reduced Black 25; 2.5g of whitening agent; and adding water to 100g. The dyes and chemicals are weighed according to the color paste formula. The vat dye CI Reduced Black 25 is dissolved in 15mL of distilled water, and then the whitening agent and the remaining distilled water are added sequentially to the material and mixed evenly until dissolved. Finally, the base paste is added and stirred evenly to obtain the color paste for printing on acrylic / viscose blended fabrics with vat dyes. The obtained color paste is then printed on the acrylic / viscose blended fabric. The printing process is as follows: flat screen printing (scraping once) → drying (100℃, 3min) → steaming (102℃, 10min) → rinsing twice with cold water → soaping → cold water washing → drying.

[0039] Example 2

[0040] A method for preparing an organic hydrotalcite / polycarboxylate composite paste for vat dye printing on acrylic / viscose blended fabrics, the specific method including the following steps:

[0041] (1) Preparation of polycarboxylic acid: 1 mL of acrylic acid, 1 g of sodium methacrylate, 10 g of methoxy polyethylene glycol methacrylate with a degree of polymerization of n=23 and 1 g of 2-acrylamide-2-methylpropanesulfonic acid were dissolved in 200 mL of distilled water to prepare a monomer solution. 0.5 g of ammonium persulfate was dissolved in 50 mL of distilled water to prepare an initiator solution. The solutions were then prepared by adding the monomer solution and the ammonium persulfate initiator solution dropwise to a four-necked flask containing 100 mL of distilled water under stirring conditions and a controlled temperature of 79 °C. The dropwise addition time was controlled at 2 h. After the addition was completed, the solution was kept at the temperature for 3 h. Finally, the solution was cooled to obtain an aqueous solution of polycarboxylic acid.

[0042] (2) Preparation of hydrotalcite: 1 mol magnesium nitrate, 0.1 mol calcium nitrate and 0.2 mol aluminum nitrate were dissolved in 1000 mL of deionized water to prepare a mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate. 1 mol sodium carbonate, 0.1 mol sodium oxalate and 1 mol sodium bicarbonate were dissolved in 1000 mL of deionized water to prepare a mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate. Under stirring conditions, the mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate was added dropwise to the mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate over a period of 2 hours. After the addition was complete, the pH of the reaction solution was adjusted to 10 with 20 wt% sodium hydroxide solution, the reaction was stirred, the reaction temperature was adjusted to 50 °C, and the reaction time was 3 hours. After the reaction was completed, the solution was filtered, washed with deionized water, and finally dried to obtain hydrotalcite.

[0043] (3) Preparation of organic hydrotalcite: Sodium dodecyl sulfonate was dissolved in distilled water to prepare a sodium dodecyl sulfonate aqueous solution with a mass fraction of 1%; 10g of hydrotalcite prepared in step (2) was added to 100mL of sodium dodecyl sulfonate aqueous solution, stirred and reacted, the reaction temperature was adjusted to 50℃, and the reaction time was 3 hours; after the reaction was completed, it was filtered; washed with distilled water, then dried, ground, and the ground powder was sieved through a 100-mesh sieve to obtain organic hydrotalcite.

[0044] (4) Preparation of organic hydrotalcite / polycarboxylic acid composite paste: Add 10 mL of the polycarboxylic acid aqueous solution obtained in step (1) and 5 g of the organic hydrotalcite obtained in step (3) to 100 mL of distilled water, stir to dissolve, adjust the reaction temperature to 40℃, and the reaction time to 3 hours. After the reaction is completed, spray dry to obtain powdered organic hydrotalcite / polycarboxylic acid composite paste.

[0045] The application of organic hydrotalcite / polycarboxylate composite paste for printing on acrylic / viscose blended fabrics with vat dyes is described below. The method involves selecting the following color paste formula: 26g of the organic hydrotalcite / polycarboxylate composite paste prepared in this invention; 2.0g of vat dye CI Reduced Black 25; 2g of whitening agent; and adding water to 100g. The dyes and chemicals are weighed according to the color paste formula. The vat dye CI Reduced Black 25 is dissolved in 15mL of distilled water, and then the whitening agent and the remaining distilled water are added sequentially to the material and mixed evenly until dissolved. Finally, the base paste is added and stirred evenly to obtain the color paste for printing on acrylic / viscose blended fabrics with vat dyes. The obtained color paste is then printed on the acrylic / viscose blended fabric. The printing process is as follows: flat screen printing (scraping once) → drying (100℃, 3min) → steaming (102℃, 10min) → rinsing twice with cold water → soaping → cold water washing → drying.

[0046] Example 3

[0047] A method for preparing an organic hydrotalcite / polycarboxylate composite paste for vat dye printing on acrylic / viscose blended fabrics, the specific method including the following steps:

[0048] (1) Preparation of polycarboxylic acid: 1 mL of acrylic acid, 3 g of sodium methacrylate, 30 g of methoxy polyethylene glycol methacrylate with a degree of polymerization of n=23 and 3 g of 2-acrylamide-2-methylpropanesulfonic acid were dissolved in 200 mL of distilled water to prepare a monomer solution. 1.5 g of ammonium persulfate was dissolved in 50 mL of distilled water to prepare an initiator solution. The solutions were then prepared by stirring and controlling the temperature at 81 °C. The prepared monomer solution and ammonium persulfate initiator solution were added dropwise to a four-necked flask containing an appropriate amount of distilled water. The addition time was controlled at 3 h. After the addition was completed, the solution was kept at the temperature for 4 h. Finally, the solution was cooled to obtain an aqueous solution of polycarboxylic acid.

[0049] (2) Preparation of hydrotalcite: 1 mol magnesium nitrate, 0.2 mol calcium nitrate and 0.4 mol aluminum nitrate were dissolved in 1200 mL of deionized water to prepare a mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate. 1 mol sodium carbonate, 0.2 mol sodium oxalate and 2 mol sodium bicarbonate were dissolved in 1200 mL of deionized water to prepare a mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate. Under stirring conditions, the mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate was added dropwise to the mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate over a period of 4 hours. After the addition was complete, the pH of the reaction solution was adjusted to 11 with 30 wt% sodium hydroxide aqueous solution, the reaction was stirred, the reaction temperature was adjusted to 70 °C, and the reaction time was 5 hours. After the reaction was completed, the solution was filtered, washed with deionized water, and finally dried to obtain hydrotalcite.

[0050] (3) Preparation of organic hydrotalcite: Sodium dodecyl sulfonate was dissolved in distilled water to prepare a sodium dodecyl sulfonate aqueous solution with a mass fraction of 2%; 10g of hydrotalcite prepared in step (2) was added to 120mL of sodium dodecyl sulfonate aqueous solution, stirred and reacted, the reaction temperature was adjusted to 70℃, and the reaction time was 5 hours; after the reaction was completed, it was filtered; washed with distilled water, then dried, ground, and the ground powder was sieved through a 200-mesh sieve to obtain organic hydrotalcite.

[0051] (4) Preparation of organic hydrotalcite / polycarboxylic acid composite paste: Add 10 mL of the polycarboxylic acid aqueous solution obtained in step (1) and 15 g of the organic hydrotalcite obtained in step (3) to 200 mL of distilled water, stir to dissolve, adjust the reaction temperature to 60℃, and the reaction time to 5 hours. After the reaction is completed, spray dry to obtain powdered organic hydrotalcite / polycarboxylic acid composite paste.

[0052] The application of organic hydrotalcite / polycarboxylate composite paste for printing on acrylic / viscose blended fabrics with vat dyes is described below. The method involves selecting the following color paste formula: 28g of the organic hydrotalcite / polycarboxylate composite paste prepared in this invention; 2.2g of vat dye CI Reduced Black 25; 3g of whitening agent; and adding water to 100g. The dyes and chemicals are weighed according to the color paste formula. The vat dye CI Reduced Black 25 is dissolved in 15mL of distilled water, and then the whitening agent and the remaining distilled water are added sequentially to the material and mixed evenly until dissolved. Finally, the base paste is added and stirred evenly to obtain the color paste for printing on acrylic / viscose blended fabrics with vat dyes. The obtained color paste is then printed on the acrylic / viscose blended fabric. The printing process is as follows: flat screen printing (scraping once) → drying (100℃, 3min) → steaming (102℃, 10min) → rinsing twice with cold water → soaping → cold water washing → drying.

[0053] Comparative Example A

[0054] Compared with Example 1, steps (1) and (4) were not performed, and the organic hydrotalcite prepared in step (3) was directly used in the paste; other preparation methods and application methods remained unchanged from Example 1.

[0055] Comparative Example B

[0056] Compared with Example 1, step (3) was not performed, and the hydrotalcite prepared in step (2) was directly used in the preparation of the composite paste in step (4); that is, "adding 10 mL of the polycarboxylic acid aqueous solution obtained in step (1) and 10 g of the organic hydrotalcite obtained in step (3)" was changed to "adding 10 mL of the polycarboxylic acid aqueous solution obtained in step (1) and 10 g of the hydrotalcite obtained"; other preparation methods and application methods remained unchanged from Example 1.

[0057] Comparative Example C

[0058] Compared with Example 1, the "10g of organic hydrotalcite obtained in step (3)" in step (4) was changed to "1g of organic hydrotalcite obtained in step (3); other preparation methods and application methods remained unchanged from Example 1.

[0059] Comparative Example D

[0060] Textile printing paste SV-14 from the market was used as the paste in this embodiment. The color paste was prepared using the method of Example 1 and printed on acrylic / viscose blended fabrics.

[0061] Application performance testing:

[0062] The viscosity of the pastes prepared in Examples 1-3 and Comparative Example AD was tested using a digital viscometer. The printing viscosity index (PVI value) was calculated as follows: Among them, η6 and η 0.6The values ​​represent the viscosity of the paste at 6 r / min and 0.6 r / min, respectively. The test results are shown in Table 1.

[0063] The acrylic / viscose blended fabrics printed using Examples 1-3 and Comparative Example AD were subjected to relevant tests: the K / S value was measured using a computer colorimeter, and the penetration rate was expressed as the ratio of the K / S value on the reverse side of the fabric to the K / S value on the front side; the color fastness to washing was tested according to GB / T3921-2008 "Textiles - Tests for Color Fastness - Color Fastness to Washing"; the color fastness to dry rubbing was tested according to GB / T3920-2008 "Textiles - Tests for Color Fastness - Color Fastness to Rubbing"; the formula for calculating the desizing rate is: m1 represents the mass of the printed and dried fabric, m2 represents the mass of the printed fabric after washing, and m0 represents the mass of the unprinted fabric; Fabric softness test: The softness of the printed fabric was tested using a fabric style meter; Outline sharpness test: The sharpness level was assessed visually; The test results are shown in Table 1.

[0064] Table 1. Performance Evaluation of Organic Hydrotalcite / Polycarboxylate Composite Paste for Vat Dye Printing of Acrylic / Viscose Blended Fabrics

[0065]

[0066]

[0067] As shown in Table 1, comparing Example 1 and Comparative Example A reveals that polycarboxylic acid plays a crucial role in the printing performance of the organic hydrotalcite / polycarboxylic acid composite paste. Comparing Example 1 and Comparative Example B shows that organic modification of hydrotalcite is beneficial to improving the printing performance of the composite paste. Comparing Example 1 and Comparative Example C shows that the amount of organic hydrotalcite used in the composite paste plays a significant role. Comparing Examples 1-3 and Comparative Example D reveals that, compared to existing commercial printing pastes, the organic hydrotalcite / polycarboxylic acid composite paste prepared in this invention, and the resulting acrylic / viscose blended fabrics, meet or exceed many test index values ​​of existing commercial printing pastes and their resulting acrylic / viscose blended fabrics.

Claims

1. A method for preparing an organic hydrotalcite / polycarboxylate composite paste for printing with vat dyes on acrylic / viscose blended fabrics, characterized in that, The preparation method includes the following steps: (1) Preparation of polycarboxylic acid aqueous solution: Acrylic acid, sodium methacrylate, methoxy polyethylene glycol methacrylate and 2-acrylamide-2-methylpropanesulfonic acid were dissolved in distilled water to prepare a monomer solution, and ammonium persulfate was dissolved in distilled water to prepare an initiator solution. Then, under stirring conditions and with the temperature controlled at 79-81℃, the prepared monomer solution and ammonium persulfate initiator solution were added dropwise to a four-necked flask containing distilled water. The addition time was controlled at 2-3 hours. After the addition was completed, the temperature was kept for 3-4 hours. Finally, the solution was cooled to obtain polycarboxylic acid aqueous solution. (2) Preparation of hydrotalcite: Magnesium nitrate, calcium nitrate and aluminum nitrate were dissolved in distilled water to prepare a mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate. Sodium carbonate, sodium oxalate and sodium bicarbonate were dissolved in distilled water to prepare a mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate. Under stirring conditions, the mixed aqueous solution of sodium carbonate, sodium oxalate and sodium bicarbonate was added dropwise to the mixed aqueous solution of magnesium nitrate, calcium nitrate and aluminum nitrate for 2 to 4 hours. After the addition was completed, the pH of the reaction solution was adjusted to 10 to 11 with 20 to 30 wt% sodium hydroxide aqueous solution. The reaction was stirred and the reaction temperature was adjusted to 50 to 70 °C for 3 to 5 hours. After the reaction was completed, the solution was filtered, washed with distilled water, and finally dried to obtain hydrotalcite. (3) Preparation of organic hydrotalcite: Sodium dodecyl sulfonate was dissolved in distilled water to prepare an aqueous solution of sodium dodecyl sulfonate with a mass fraction of 1-2%; the hydrotalcite prepared in step (2) was added to the aqueous solution of sodium dodecyl sulfonate, stirred and reacted, the reaction temperature was adjusted to 50-70℃, and the reaction time was 3-5 hours; after the reaction was completed, it was filtered; washed with distilled water, then dried, ground, and the ground powder was sieved through a 100-200 mesh sieve to obtain organic hydrotalcite; (4) Preparation of organic hydrotalcite / polycarboxylic acid composite paste: Add the polycarboxylic acid aqueous solution obtained in step (1) and the organic hydrotalcite obtained in step (3) to distilled water, stir to dissolve, adjust the reaction temperature to 40-60℃, the reaction time to 3-5 hours, and spray dry after the reaction to obtain organic hydrotalcite / polycarboxylic acid composite paste. In step (4), the ratio of the amount of polycarboxylic acid aqueous solution obtained in step (1), the amount of organic hydrotalcite obtained in step (3), and the amount of distilled water is: 1 mL : (0.5-1.5) g : (10-20) mL.

2. The method for preparing the organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics according to claim 1, characterized in that, In step (1), the ratio of acrylic acid, sodium methacrylate, methoxy polyethylene glycol methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid is 1 mL : (1-3) g : (10-30) g : (1-3) g; the degree of polymerization of methoxy polyethylene glycol methacrylate is n =23 or 45; the volume ratio of ammonium persulfate initiator solution to monomer solution is 1: (3-5); the concentration of ammonium persulfate initiator solution is 1-3 wt%.

3. The method for preparing the organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics according to claim 1, characterized in that, The ratio of magnesium nitrate, calcium nitrate, aluminum nitrate to distilled water in step (2) is 1 mol: (0.1-0.2) mol: (0.2-0.4) mol: (1000-1200) mL; the ratio of sodium carbonate, sodium oxalate, and sodium bicarbonate to distilled water is 1 mol: (0.1-0.2) mol: (1-2) mol: (1000-1200) mL.

4. The method for preparing the organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics according to claim 1, characterized in that, The ratio of the amount of hydrotalcite prepared in step (2) to the aqueous solution of sodium dodecyl sulfonate in step (3) is 1 g: (10-12) mL.

5. An organic hydrotalcite / polycarboxylate composite paste for printing with vat dyes on acrylic / viscose blended fabrics, characterized in that, It is prepared using the method described in any one of claims 1 to 4 for preparing organic hydrotalcite / polycarboxylate composite paste for printing on acrylic / viscose blended fabrics with vat dyes.

6. The application of an organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics as described in claim 5, characterized in that, The application method is as follows: weigh the dyeing materials according to the color paste formula, dissolve the vat dye in 10-20 mL of distilled water, then add the whitening agent and the remaining distilled water to the material in sequence, mix evenly and dissolve it; finally add the base paste, stir evenly, and prepare a vat dye printing color paste for acrylic / viscose blended fabrics; print the prepared color paste on acrylic / viscose blended fabrics.

7. The application of the organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics according to claim 6, characterized in that, The pigment paste formulation is as follows: organic hydrotalcite / polycarboxylate composite paste for printing on acrylic / viscose blended fabrics with vat dyes: 26-28g; vat dye: 2.0-2.2g; Dioscorea opposita: 2-3g; add water to 100g.

8. The application of the organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics according to claim 6, characterized in that, The vat dye is any one of CI vat yellow 2, CI vat red 29, CI vat blue 4, CI vat brown 1, CI vat black 25, and CI vat green 3.

9. The application of the organic hydrotalcite / polycarboxylate composite paste for vat dye printing of acrylic / viscose blended fabrics according to claim 6, characterized in that, The printing process is as follows: flat screen printing, squeegee printing once → drying at 100℃ for 3 minutes → steaming at 102℃ for 10 minutes → rinsing twice with cold water → soaping → washing with cold water → drying.

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