阅读说明：本技术 用于棉织物还原染料印花的有机钙钛矿糊料及其制备方法和应用 (Organic perovskite thickener for cotton fabric vat dye printing and preparation method and application thereof ) 是由 周凡雨 彭雄义 崔永明 刘仰硕 董雄伟 李强 蔡亚君 于 2020-12-28 设计创作，主要内容包括：本发明涉及用于棉织物还原染料印花的有机钙钛矿糊料及其制备方法和应用。该糊料由如下制备方法制得：首先,采用二氯甲烷和三甲胺制备钙钛矿有机前驱体,采用三氯化铝和异丙醇等为原料制备铝溶胶；然后,将钙钛矿有机前驱体与铝溶胶反应,制得钙钛矿溶胶；最后,将聚乙二醇水溶液滴加到钙钛矿溶胶水溶液反应,制得聚乙二醇修饰的钙钛矿,即为用于棉织物还原染料印花的有机钙钛矿糊料。本发明制备的有机钙钛矿糊料用于棉织物还原染料印花,制得的印花面料表现为脱糊率高于90%；柔软度好；轮廓清晰度高；渗透率高于92%；耐干摩擦色牢度和皂洗变色牢度等级高等特点,具有很好的应用前景。(The invention relates to an organic perovskite thickener for cotton fabric vat dye printing and a preparation method and application thereof. The paste is prepared by the following preparation method: firstly, preparing a perovskite organic precursor by adopting dichloromethane and trimethylamine, and preparing aluminum sol by adopting aluminum trichloride, isopropanol and the like as raw materials; then, reacting the perovskite organic precursor with alumina sol to prepare perovskite sol; and finally, dropwise adding a polyethylene glycol aqueous solution into the perovskite sol aqueous solution for reaction to prepare polyethylene glycol modified perovskite, namely the organic perovskite thickener for cotton fabric vat dye printing. The organic perovskite thickener prepared by the invention is used for cotton fabric vat dye printing, and the paste removal rate of the prepared printed fabric is higher than 90%; the softness is good; the definition of the outline is high; the permeability is higher than 92%; high grade of dry rubbing color fastness and soaping color fastness, and good application prospect.)

1. A preparation method of organic perovskite paste for cotton fabric vat dye printing is characterized by comprising the following steps:

(1) preparing a perovskite organic precursor: adding dichloromethane and trimethylamine into an acetonitrile solution, reacting at room temperature for 24-36 h, and after the reaction is finished, carrying out reduced pressure distillation to obtain a white solid to obtain a perovskite organic precursor;

(2) preparing aluminum sol: mixing aluminum trichloride (AlCl)₃) Uniformly mixing with isopropanol, stirring for 1-3 hours, and introducing ammonia gas for reaction for 2-4 hours; after the reaction is finished, filtering to obtain filtrate, namely the mixed solution of aluminum isopropoxide and isopropanol; dissolving aluminum isopropoxide-isopropanol mixed solution in propanol to prepare mixed solution a, dissolving 5% hydrochloric acid in deionized water to prepare mixed solution b, dropwise adding the mixed solution b to the mixed solution a under the condition of stirring, wherein the dropwise adding time is 1-3 hours, the reaction temperature is 80-90 ℃, and after the dropwise adding is finished, stirring and reacting for 1-3 hours to prepare aluminum sol;

(3) preparation of perovskite sol: adding a methanol solvent into the perovskite organic precursor prepared in the step (1) and alumina sol for reaction, stirring and reacting, wherein the reaction temperature is 50-60 ℃, and the reaction time is 3-5 h; slowly volatilizing the methanol to prepare perovskite sol;

(4) modification with polyethylene glycol: dissolving the perovskite sol in distilled water to prepare a perovskite sol aqueous solution, dissolving polyethylene glycol in distilled water to prepare a polyethylene glycol aqueous solution, dropwise adding the polyethylene glycol aqueous solution to the perovskite sol aqueous solution, stirring and reacting for 3-5 h at the reaction temperature of 40-50 ℃ to prepare the organic perovskite paste.

2. The method for preparing organic perovskite paste for cotton fabric vat dye printing according to claim 1, wherein the amount ratio of dichloromethane (mL), trimethylamine (mL) and acetonitrile (mL) is: 1: 1 to 1.2: 2 to 4.

3. The method for preparing organic perovskite paste for cotton fabric vat dye printing according to claim 1, wherein the mass-to-volume ratio of aluminum trichloride (g) to isopropanol (mL) is: 1: 10-20; the introduction speed of the ammonia gas is as follows: 1-3 mL/min; the volume ratio of the aluminum isopropoxide-isopropanol mixed solution (mL) to the propanol (mL) in the mixed solution a is as follows: 1: 1-3; the mass-to-volume ratio of the 5% hydrochloric acid (mL) to the deionized water (mL) in the mixed solution b is as follows: 1: 10-20.

4. The preparation method of organic perovskite paste for cotton fabric vat dye printing according to claim 1, wherein the perovskite organic precursor (g) prepared in step (1), the aluminum sol (mL) and the methanol (mL) are used in the following ratio: 1: 1 to 1.2: 10 to 12.

5. The method for preparing organic perovskite paste for cotton fabric vat dye printing according to claim 1, wherein the amount ratio of the perovskite sol (g) to distilled water (mL) is: 1: 10-12; the dosage ratio of the polyethylene glycol (g) to the distilled water (mL) is as follows: 1: 10-12; the dosage ratio of the polyethylene glycol aqueous solution to the perovskite sol aqueous solution is as follows: 1: 5-7; the molecular weight of the polyethylene glycol is any one of 500, 1000 and 2000.

6. An organic perovskite thickener for cotton fabric vat dye printing is characterized by being prepared by the preparation method of the organic perovskite thickener for cotton fabric vat dye printing according to any one of claims 1 to 5.

7. Use of an organic perovskite paste for vat dye printing of cotton fabrics as defined in claim 6, characterized in that the method of application is: weighing the dye according to the color paste formula, dissolving the vat dye with 10-20 mL of distilled water, sequentially adding rongalite and the rest of distilled water to the materials, and uniformly mixing to dissolve the materials; finally, adding the basic paste, and uniformly stirring to prepare the vat dye printing paste for the cotton fabric; and printing the prepared color paste on the cotton fabric.

8. The application of the organic perovskite paste for cotton fabric vat dye printing according to claim 7, wherein the color paste formula is as follows: the organic perovskite thickener for cotton fabric vat dye printing prepared by the invention comprises the following components in parts by weight: 24-26 g; reducing a dye: 2.2-2.6 g; white carving powder: 1-2 g; water was added to 100 g.

9. Use of the organic perovskite paste for cotton fabric vat dye printing according to claim 7, wherein the vat dye is any one of c.i. vat yellow 2, c.i. vat red 29, c.i. vat blue 4, c.i. vat brown 1, c.i. vat black 25, c.i. vat green 3.

10. Use of the organic perovskite paste for cotton fabric vat dye printing according to claim 7, wherein the printing process is: screen printing (scraping 1 time) → drying (100 ℃, 3min) → steaming (102 ℃, 10min) → cold water rinsing 2 times → soaping → cold water washing → drying.

Technical Field

The invention belongs to the technical field of preparation and application of paste, and particularly relates to organic perovskite paste for cotton fabric vat dye printing, and a preparation method and application thereof.

Background

The printing paste is a high molecular compound which plays a role in thickening and dye transferring in textile printing paste, and can be dissolved in water or fully swelled and dispersed in water to form a thick colloidal solution. As an essential important component in printing color paste, the rheological property, water holding property, reactivity with reactive dye, washing difficulty and other properties of the printing color paste directly influence the printing effect, such as the color light, the surface color supply quantity, the pattern outline definition, the printing uniformity, the hand feeling and the like of printed fabrics.

Cotton fabrics are often dyed with reactive dyes and vat dyes, and because vat dyes are expensive, cotton textiles are mostly dyed with cheap direct, reactive dyes and the like. Especially after 1956, China began to produce reactive dyes, and the application of vat dyes to dye on a jig dyeing machine is rare. In recent years, many dyeing enterprises have restarted to dye by using vat dyes with the requirements of consumers for improving various color fastness and environmental protection.

The vat dyes have excellent dyeing reproducibility compared to reactive dyes. The vat dyes are characterized by a complete series of colours from yellow to black and from vivid to normal colours, the greatest feature being the majority of intermediate colours, which are essentially single components, with good dyeing reproducibility, in particular in the green, olive green, flesh, brown and grey series. The requirements on cotton fabrics for various complex fastnesses based on light fastness, such as perspiration-daylight fastness, perspiration-daylight-washing fastness, perspiration-daylight-rubbing fastness, etc., are increasing nowadays, in particular pale-coloured, vat dyes have the special properties in this respect compared with other classes of dyes for cotton, and are therefore very suitable for dyeing and printing work clothing, summer clothing, sportswear, overcoat, curtains, furniture coverings, etc. The vat dye has little conflict with general resin finishing, and the recently developed functional processing for changing the physical properties of the fiber, such as shape memory processing, form stabilization processing, deodorization processing, antibacterial processing, etc., has good stability, and the vat dye dyed matter has more stable temporal change property than the vat dye dyed matter.

The earliest perovskite oxide discovered was the compound calcium titanate (CaTiO) in perovskite ore₃) And are thus named. Later, traditional perovskites were referred to as a class of molecules of the general formula ABO₃The oxide of (a), which was first found to be calcium titanate (CaTiO) present in perovskite ore₃) Compound, the name given thereby. In recent years, perovskites have been rapidly developed and widely used in many fields, and the concept of perovskites has been further expanded. Wherein the novel organic-inorganic composite perovskite material is a derivative of the traditional perovskite material, and the molecular general formula of the novel organic-inorganic composite perovskite material conforms to ABX₃A structure of type wherein a represents an organic cation, B is a metal ion, and X is typically a halide ion. Wherein B and X form an octahedral structure, the octahedrons are connected in a common vertex mode, and A is connected into an octahedral gap through an H bond. By modulating ABX₃Ions at different positions in the structure can obtain perovskite materials with different structures and different properties. The literature research shows that the perovskite is widely concerned in many fields, but the application of the perovskite in the field of printing paste is rarely reported and needs to be further explored.

Ordinary perovskite materials are not easy to form paste, and the possibility of paste forming of the novel organic-inorganic composite perovskite materials can be enhanced by adjusting the molecular structures of organic and inorganic substances. The conventional perovskite material cannot enable chemical additives and dyes to be uniformly dispersed in a colloid system, and the viscosity of the perovskite material is greatly changed during dilution; in addition, it has a weak ability to transfer dyes. Due to the existence of these disadvantages, the application of perovskite materials in the field of printing pastes is limited, and the disadvantages must be technically overcome.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an organic perovskite paste for cotton fabric vat dye printing and a preparation method and application thereof.

The invention aims to provide an organic perovskite paste for cotton fabric vat dye printing, which is prepared by the following preparation method: firstly, preparing a perovskite organic precursor by adopting dichloromethane and trimethylamine, and preparing aluminum sol by adopting aluminum trichloride, isopropanol and the like as raw materials; then, reacting the perovskite organic precursor with alumina sol to prepare perovskite sol; and finally, dropwise adding a polyethylene glycol aqueous solution into the perovskite sol aqueous solution for reaction to prepare polyethylene glycol modified perovskite, namely the organic perovskite thickener for cotton fabric vat dye printing.

The invention aims to provide a preparation method of an organic perovskite paste for cotton fabric vat dye printing, which comprises the following steps:

(1) preparing a perovskite organic precursor: adding dichloromethane and trimethylamine into an acetonitrile solution, reacting at room temperature for 24-36 h, and after the reaction is finished, carrying out reduced pressure distillation to obtain a white solid, namely the perovskite organic precursor.

Preferably, the dichloromethane (mL), trimethylamine (mL) and acetonitrile (mL) are used in the following ratio: 1: 1-1.2: 2-4.

(2) Preparing aluminum sol: mixing aluminum trichloride (AlCl)₃) Uniformly mixing with isopropanol, stirring for 1-3 hours, and introducing ammonia gas for reaction for 2-4 hours; after the reaction is finished, filtering to obtain filtrate, namely the mixed solution of aluminum isopropoxide and isopropanol; dissolving aluminum isopropoxide-isopropanol mixed solution in propanol to prepare mixed solution a, dissolving 5% hydrochloric acid in deionized water to prepare mixed solution b, dropwise adding the mixed solution b to the mixed solution a under the condition of stirring, wherein the dropwise adding time is 1-3 hours, the reaction temperature is 80-90 ℃, and after the dropwise adding is finished, stirring and reacting for 1-3 hours to prepare the aluminum sol.

Preferably, the mass-to-volume ratio of aluminum trichloride (g) to isopropanol (mL) is: 1: 10-20; the introduction speed of the ammonia gas is as follows: 1-3 mL/min.

Preferably, the volume ratio of the aluminum isopropoxide-isopropanol mixed solution (mL) to the propanol (mL) in the mixed solution a is as follows: 1: 1-3; the mass-to-volume ratio of the 5% hydrochloric acid (mL) to the deionized water (mL) in the mixed solution b is as follows: 1: 10-20.

(3) Preparation of perovskite sol: adding a methanol solvent into the perovskite organic precursor prepared in the step (1) and alumina sol for reaction, stirring and reacting, wherein the reaction temperature is 50-60 ℃, and the reaction time is 3-5 h; and slowly volatilizing the methanol to obtain the perovskite sol.

Preferably, the perovskite organic precursor (g) prepared in step (1), the aluminum sol (mL) and the methanol (mL) are used in the following ratio: 1: 1 to 1.2: 10 to 12.

(4) Modification with polyethylene glycol: dissolving the perovskite sol in distilled water to prepare a perovskite sol aqueous solution, dissolving polyethylene glycol in distilled water to prepare a polyethylene glycol aqueous solution, dropwise adding the polyethylene glycol aqueous solution to the perovskite sol aqueous solution, stirring and reacting for 3-5 h at the reaction temperature of 40-50 ℃ to prepare the polyethylene glycol modified perovskite.

Preferably, the perovskite sol (g) to distilled water (mL) is used in a ratio of: 1: 10-12; the dosage ratio of the polyethylene glycol (g) to the distilled water (mL) is as follows: 1: 10-12; the dosage ratio of the polyethylene glycol aqueous solution to the perovskite sol aqueous solution is as follows: 1: 5-7; the molecular weight of the polyethylene glycol is any one of 500, 1000 and 2000.

The invention also aims to provide an application method of the organic perovskite paste for cotton fabric vat dye printing, which comprises the following steps: weighing the dye according to the color paste formula, dissolving the vat dye with 10-20 mL of distilled water, sequentially adding rongalite and the rest of distilled water to the materials, and uniformly mixing to dissolve the materials; finally, adding the basic paste, and uniformly stirring to prepare the vat dye printing paste for the cotton fabric; and printing the prepared color paste on the cotton fabric.

Preferably, the color paste formula is as follows: basic paste material: 24-26 g; reducing a dye: 2.2-2.6 g; white carving powder: 1-2 g; water was added to 100 g.

Preferably, the base paste is the organic perovskite paste for cotton fabric reduced dye printing prepared by the invention; the vat dye is any one of C.I. vat yellow 2, C.I. vat red 29, C.I. vat blue 4, C.I. vat brown 1, C.I. vat black 25 and C.I. vat green 3.

Preferably, the printing process is as follows: screen printing (scraping 1 time) → drying (100 ℃, 3min) → steaming (102 ℃, 10min) → cold water rinsing 2 times → soaping → cold water washing → drying.

The invention has the following remarkable advantages:

(1) the organic perovskite paste prepared by the invention contains polyethylene glycol long-chain branches and aluminum sol, wherein the organic polyethylene glycol long-chain branches increase the water solubility and the dispersibility of the paste, so that the paste is easier to form; the aluminum sol improves the wetting property and the adhesion property, namely, the aluminum sol can well wet fabrics and attach dyes.

(2) The organic perovskite paste prepared by the invention realizes the purpose of uniformly dispersing the dye and the chemical auxiliary agent in a colloid system; when the paste is diluted, the viscosity change of the paste is small; in addition, the paste has certain permeability after being prepared into printing paste, has proper permeability to fabrics, and can permeate into the fabrics.

(3) The organic perovskite thickener for the vat dye printing of the cotton fabric prepared by the invention is used for the vat dye printing of the cotton fabric, and the paste removal rate of the prepared printing fabric is higher than 90 percent; the softness is good; the definition of the outline is high; the permeability is higher than 92%; high grade of dry rubbing color fastness and soaping color fastness, and the like, and has good application prospect.

Detailed Description

C.i. vat red 29 was purchased from qiangsu walde chemical limited; printing paste SV-14 was purchased from Xiamen chemical Co., Ltd.

Example 1

The preparation method of the organic perovskite paste for cotton fabric vat dye printing comprises the following steps:

(1) preparing a perovskite organic precursor: and adding 10mL of dichloromethane and 11mL of trimethylamine into 30mL of acetonitrile solution, reacting at room temperature for 30h, and after the reaction is finished, carrying out reduced pressure distillation to obtain a white solid, namely the perovskite organic precursor.

(2) Preparing aluminum sol: 10g of aluminum trichloride (AlCl)₃) Uniformly mixing with 150mL of isopropanol, stirring for 2 hours, and introducing ammonia gas for reaction, wherein the introduction speed of the ammonia gas is as follows: 2mL/min, and the reaction time is 3 hours; after the reaction is finished, filtering to obtain filtrate, namely the mixed solution of aluminum isopropoxide and isopropanol; dissolving 100mL of aluminum isopropoxide-isopropanol mixed solution in 200mL of propanol to prepare a mixed solution a, dissolving 10mL of 5% hydrochloric acid in 150mL of deionized water to prepare a mixed solution b, dropwise adding the mixed solution b to the mixed solution a under the condition of stirring, wherein the dropwise adding time is 2 hours, the reaction temperature is 85 ℃, and after the dropwise adding is finished, stirring and reacting for 2 hours to prepare aluminum sol;

(3) preparation of perovskite sol: adding 10g of the perovskite organic precursor prepared in the step (1) and 11mL of alumina sol into 110mL of methanol solvent for reaction, stirring for reaction, wherein the reaction temperature is 55 ℃, and the reaction time is 4 h; and slowly volatilizing the methanol to obtain the perovskite sol.

(4) Modification with polyethylene glycol: dissolving 10g of perovskite sol into 110mL of distilled water to prepare a perovskite sol aqueous solution, dissolving 10g of polyethylene glycol with the molecular weight of 1000 into 110mL of distilled water to prepare a polyethylene glycol aqueous solution, dripping 10mL of the polyethylene glycol aqueous solution into 60mL of the perovskite sol aqueous solution, stirring and reacting for 4h at the reaction temperature of 45 ℃ to prepare the polyethylene glycol modified perovskite.

The application of the organic perovskite thickener for cotton fabric vat dye printing comprises the following steps: the color paste formula is selected as follows: the organic perovskite paste prepared by the invention comprises the following components: 25g of the total weight of the mixture; reducing a dye: 2.4 g; white carving powder: 1.5 g; water was added to 100 g. Weighing the dye according to the color paste formula, dissolving the vat dye in 15mL of distilled water, sequentially adding rongalite and the rest of distilled water to the materials, and uniformly mixing to dissolve the materials; finally, adding the basic paste, and uniformly stirring to prepare the vat dye printing paste for the cotton fabric; printing the prepared color paste on a cotton fabric; the printing process comprises the following steps: screen printing (scraping 1 time) → drying (100 ℃, 3min) → steaming (102 ℃, 10min) → cold water rinsing 2 times → soaping → cold water washing → drying.

Example 2

The preparation method of the organic perovskite paste for cotton fabric vat dye printing comprises the following steps:

(1) preparing a perovskite organic precursor: and adding 10mL of dichloromethane and 10mL of trimethylamine into 20mL of acetonitrile solution, reacting at room temperature for 24h, and after the reaction is finished, carrying out reduced pressure distillation to obtain a white solid, namely the perovskite organic precursor.

(2) Preparing aluminum sol: 10g of aluminum trichloride (AlCl)₃) Uniformly mixing with 100mL of isopropanol, stirring for 1 hour, and introducing ammonia gas for reaction, wherein the introduction speed of the ammonia gas is as follows: 1mL/min, and the reaction time is 2 hours; after the reaction is finished, filtering to obtain filtrate, namely the mixed solution of aluminum isopropoxide and isopropanol; dissolving 100mL of aluminum isopropoxide-isopropanol mixed solution in 100mL of propanol to prepare a mixed solution a, dissolving 10mL of 5% hydrochloric acid in 100mL of deionized water to prepare a mixed solution b, dropwise adding the mixed solution b to the mixed solution a under the condition of stirring, wherein the dropwise adding time is 1 hour, the reaction temperature is 80 ℃, and after the dropwise adding is finished, stirring and reacting for 1 hour to prepare aluminum sol;

(3) preparation of perovskite sol: adding 10g of the perovskite organic precursor prepared in the step (1) and 10mL of alumina sol into 100mL of methanol solvent for reaction, stirring for reaction, wherein the reaction temperature is 50 ℃, and the reaction time is 3 h; and slowly volatilizing the methanol to obtain the perovskite sol.

(4) Modification with polyethylene glycol: dissolving 10g of perovskite sol into 100mL of distilled water to prepare a perovskite sol aqueous solution, dissolving 10g of polyethylene glycol with the molecular weight of 500 into 100mL of distilled water to prepare a polyethylene glycol aqueous solution, dripping 10mL of the polyethylene glycol aqueous solution into 50mL of the perovskite sol aqueous solution, stirring and reacting for 3h at the reaction temperature of 40 ℃ to prepare the polyethylene glycol modified perovskite.

The application of the organic perovskite thickener for cotton fabric vat dye printing comprises the following steps: the color paste formula is selected as follows: the organic perovskite paste prepared by the invention comprises the following components: 24g of a mixture; reducing a dye: 2.2 g; white carving powder: 1g of a compound; water was added to 100 g. Weighing the dye according to the color paste formula, dissolving the vat dye with 10mL of distilled water, sequentially adding rongalite and the rest distilled water to the materials, and uniformly mixing to dissolve the materials; finally, adding the basic paste, and uniformly stirring to prepare the vat dye printing paste for the cotton fabric; printing the prepared color paste on a cotton fabric; the printing process comprises the following steps: screen printing (scraping 1 time) → drying (100 ℃, 3min) → steaming (102 ℃, 10min) → cold water rinsing 2 times → soaping → cold water washing → drying.

Example 3

The preparation method of the organic perovskite paste for cotton fabric vat dye printing comprises the following steps:

(1) preparing a perovskite organic precursor: and adding 10mL of dichloromethane and 12mL of trimethylamine into 40mL of acetonitrile solution, reacting at room temperature for 36h, and after the reaction is finished, carrying out reduced pressure distillation to obtain a white solid, namely the perovskite organic precursor.

(2) Preparing aluminum sol: 10g of aluminum trichloride (AlCl)₃) Mixing with 200mL of isopropanol uniformly, stirring for 3 hours, and introducing ammonia gas for reaction, wherein the introduction speed of the ammonia gas is as follows: 3mL/min, and the reaction time is 4 hours; after the reaction is finished, filtering to obtain filtrate, namely the mixed solution of aluminum isopropoxide and isopropanol; dissolving 100mL of aluminum isopropoxide-isopropanol mixed solution in 300mL of propanol to prepare a mixed solution a, dissolving 10mL of 5% hydrochloric acid in 200mL of deionized water to prepare a mixed solution b, dropwise adding the mixed solution b to the mixed solution a under the condition of stirring, wherein the dropwise adding time is 3 hours, the reaction temperature is 90 ℃, and after the dropwise adding is finished, stirring and reacting for 3 hours to prepare aluminum sol;

(3) preparation of perovskite sol: 10g of the perovskite organic precursor prepared in the step (1) and 12mL of alumina sol are added into 120mL of methanol solvent for reaction, and the mixture is stirred for reaction at the reaction temperature of 60 ℃ for 5 h; and slowly volatilizing the methanol to obtain the perovskite sol.

(4) Modification with polyethylene glycol: dissolving 10g of perovskite sol into 120mL of distilled water to prepare a perovskite sol aqueous solution, dissolving 10g of polyethylene glycol with the molecular weight of 2000 into 120mL of distilled water to prepare a polyethylene glycol aqueous solution, dripping 10mL of the polyethylene glycol aqueous solution into 70mL of the perovskite sol aqueous solution, stirring and reacting for 5 hours at the reaction temperature of 50 ℃ to prepare the polyethylene glycol modified perovskite.

The application of the organic perovskite thickener for cotton fabric vat dye printing comprises the following steps: the color paste formula is selected as follows: the organic perovskite paste prepared by the invention comprises the following components: 26g of a mixture; reducing a dye: 2.6 g; white carving powder: 2g of the total weight of the mixture; water was added to 100 g. Weighing the dye according to the color paste formula, dissolving the vat dye with 20mL of distilled water, sequentially adding rongalite and the rest distilled water to the materials, and uniformly mixing to dissolve the materials; finally, adding the basic paste, and uniformly stirring to prepare the vat dye printing paste for the cotton fabric; printing the prepared color paste on a cotton fabric; the printing process comprises the following steps: screen printing (scraping 1 time) → drying (100 ℃, 3min) → steaming (102 ℃, 10min) → cold water rinsing 2 times → soaping → cold water washing → drying.

Comparative example A

By way of comparison with example 1, the polyethylene glycol modification step "(4)" was not carried out, i.e., the perovskite sol was used directly as a paste, and the other preparation methods and application methods remained the same as those of example 1.

Comparative example B

By taking example 1 as a comparison, the "10 mL of the aqueous polyethylene glycol solution" in step (4) is reduced to "1 mL of the aqueous polyethylene glycol solution", and other preparation methods and application methods are the same as those in example 1.

Comparative example C

Printing paste SV-14 purchased from the market was used as the paste of this example, and a mill base was prepared and printed on a cotton fabric by the method of example 1.

And (3) application performance testing:

the pastes obtained in examples 1 to 3 and comparative examples A to C were tested for viscosity using a digital viscometer, print viscosity index (PVI value):wherein eta is₆And η_0.6The viscosity of the paste at 6r/min and 0.6r/min are respectively represented, and the test results are shown in Table 1.

The printed cotton fabrics prepared in examples 1-3 and comparative examples A-C were subjected to the relevant tests: the K/S value is measured by a computer color measuring and matching instrument, and the permeability is measured by the fabricIs expressed as the ratio of the back K/S value to the front K/S value of (a); the soaping-resistant color change fastness value test refers to GB/T3921-2008 'textile color fastness test soaping-resistant color fastness'; the dry rubbing fastness value test refers to GB/T3920-2008 'color fastness to rubbing' test for textile color fastness; the formula for calculating the paste removal rate is as follows:m₁m is the mass of the printed and dried fabric₂For the mass of the printed fabric after washing, m₀The quality of the unprinted fabric; and (3) testing the softness of the fabric: testing the softness of the printed fabric on a fabric stylizer; and (3) testing the definition of the contour: evaluating the definition grade according to a visual method; the test results are shown in table 1:

TABLE 1 evaluation of the application Properties of organic perovskite pastes for Vat dye printing of Cotton fabrics

As can be seen from table 1, by comparing example 1 with comparative example a, it can be found that: the polyethylene glycol long-chain branch plays an important role in the printing performance of the organic perovskite paste. By comparing example 1 with comparative example B, it can be found that: the printing effect is not good due to the use amount of the long-chain branch of polyethylene glycol being too small. By comparing examples 1-3 with comparative example C, it can be found that: compared with the commercial printing paste in the market, the organic perovskite paste prepared by the invention and the printed cotton fabric thereof reach or exceed the commercial printing paste in the market and the printed cotton fabric thereof on a plurality of test index values.