Anionic dispersion promoters, processes for their preparation and use

Abstract

The present application relates to an anionic dispersion promoter and its preparation method and application. The structural formula of the anionic dispersion promoter is shown as formula (1), in which R is selected from C1 to C5 alkylene, n is an integer of 1 to 3, a is an integer of 0 to 5, and b is an integer of 1 to 10. The anionic dispersion promoter of the present application has certain plasticizing effect on polyester, has good dispersion and solubilizing effect on disperse dyes, and can improve the charge density between polyester and disperse dyes, thereby effectively improving the stain resistance and dispersion stability of disperse dyes, and further improving the removal effect of polyester surface float dyeing. Therefore, the anionic dispersion promoter of the present application can be applied to the reduction cleaning process of polyester and its blended fabric after disperse dyeing together with an acidic reduction cleaning agent, can effectively remove the unfixed disperse dyes on the polyester and its blended fabric, and greatly improve the color fastness of the fabric, so as to meet the market demand.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile dyeing and finishing technology, in particular to an anionic dispersion promoter, a preparation method and application thereof. BACKGROUND

[0002] Textiles are widely used in manufacturing clothing fabrics and industrial products, and polyester is the most widely used textile at present, which is usually dyed with disperse dyes. At present, the disperse dyes that do not enter or enter part of the polyester fiber are removed by reduction cleaning process to prevent these floating colors from being stained on other clothes or skin through friction or washing during the use of the clothes, so as to meet the requirements of various dyeing fastness values of dyed polyester products.

[0003] The commonly used reduction cleaning processes at present include alkaline reduction cleaning process and acid reduction cleaning process. The commonly used reducing agents in the alkaline reduction cleaning process include sodium dithionite (sodium hyposulfite), sodium bisulfite, sulfur dioxide hydride and glucose derivatives (sodium gluconate) and the like. Among them, sodium dithionite has strong reducing power and low cost, and is the most commonly used alkaline reduction cleaning agent in the market. However, sodium dithionite has the following disadvantages when used:

[0004] (1) Sodium dithionite can spontaneously combust, especially after absorbing moisture, it will automatically heat and burn, which has a safety hazard;

[0005] (2) Sodium dithionite is unstable at high temperature and is easy to decompose and lose effectiveness, which causes vat difference and color deviation when used by customers;

[0006] (3) Sodium dithionite is easy to release sulfur dioxide gas when used, which pollutes the workshop environment, has a strong odor and damages the health of workers, and at the same time, the poor working environment increases the labor cost of enterprises;

[0007] (4) According to the provisions of the national standard GB6844-86 "Classification and Name Number of Dangerous Goods", sodium dithionite belongs to the first class of moisture-sensitive flammable materials, so it has high transportation risk and transportation cost.

[0008] Compared with the alkaline reduction cleaning process, the acid reduction cleaning process does not need to be washed and neutralized, so the process is simple, energy-saving and water-saving, and the pressure of storing a large amount of sodium dithionite is eliminated, which is a relatively environmentally friendly reduction cleaning process. The commonly used acid reduction cleaning agent is carved white powder or carved white block (sodium hydrogen sulfite formaldehyde). However, the reducing power of the acid reduction cleaning agent is weak, the reduction cleaning efficiency is low, and the color fastness of the cleaned fabric cannot meet the market demand. SUMMARY

[0009] Based on this, it is necessary to provide an anionic dispersing promoter, a preparation method and application thereof for solving the above problems; the anionic dispersing promoter can be used in the acid reduction cleaning process of dyed polyester and its blended fabric together with the acid reduction cleaning agent, can effectively remove the unfixed disperse dyes on the dyed polyester and its blended fabric, greatly improve the color fastness of the fabric, and meet the market demand.

[0010] An anionic dispersing promoter, a structural formula of which is shown as formula (1), in formula (1), R is selected from C1 to C5 alkylene, n is an integer from 1 to 3, a is an integer from 0 to 5, b is an integer from 1 to 10,

[0011] In one of the embodiments, the R is selected from C1 to C3 alkylene.

[0012] A preparation method of the anionic dispersing promoter as described above, comprising the following steps:

[0013] The first raw material and the second raw material are subjected to esterification reaction under the action of a catalyst to obtain an intermediate product;

[0014] The prepared intermediate product is subjected to sulfonation treatment to obtain the anionic dispersing promoter;

[0015] In which, the structural formula of the first raw material is shown as formula (2), and the structural formula of the second raw material is shown as formula (3):

[0016]

[0017] In formula (2), n is an integer from 1 to 3, a is an integer from 0 to 5, and b is an integer from 1 to 10; in formula (3), R is selected from C1 to C5 alkylene.

[0018] In one of the embodiments, the molar ratio of the first raw material to the second raw material is 2.0:1.0 to 2.8:1.0.

[0019] In one of the embodiments, the mass of the catalyst is 0.1% to 3.5% of the total mass of the first raw material and the second raw material, and the catalyst is selected from at least one of toluenesulfonic acid, triflic acid, phosphotungstic acid and sodium bisulfite.

[0020] In one of the embodiments, the sulfonation treatment uses at least one of concentrated sulfuric acid and sulfonyl chloride as a sulfonation agent, and the molar ratio of the sulfonation agent to the first raw material is 1.05:1.0 to 1.2:1.0.

[0021] In one of the embodiments, the esterification reaction comprises: mixing and heating the first raw material and the second raw material to 80-90 DEG C, and then mixing with the catalyst at 90-180 DEG C to perform the esterification reaction, wherein the vacuum degree of the esterification reaction is -0.05- -0.10 MPa, and the time is 3-8 h.

[0022] In one of the embodiments, the temperature of the sulfonation treatment is 80-130 DEG C, and the time is 3-10 h.

[0023] The acid reduction cleaning process for the dyed polyester and the blended fabric thereof uses the acid reduction cleaning agent and the anionic dispersion promoter as described above.

[0024] In one of the embodiments, the mass ratio of the acid reduction cleaning agent to the anionic dispersion promoter is 2:5-5:2.

[0025] The anionic dispersion promoter provided by the application has the following advantages: on one hand, the p-benzoate group contained in the structure of the anionic dispersion promoter is similar to the structure of the polyester monomer, so that the anionic dispersion promoter has good affinity with the polyester fiber and has certain plasticizing effect on the polyester, thereby being able to promote the dye stripping of the surface layer of the polyester to a certain extent, and further being beneficial to removing the surface color.

[0026] On the other hand, the anionic dispersion promoter contains rich benzene ring structures in the structure, so that the anionic dispersion promoter has large steric hindrance, has strong π-π interaction with the disperse dye, and has good affinity with the disperse dye, so that the anionic dispersion promoter has excellent dispersion and solubilization effect on the disperse dye, and the anionic dispersion promoter structure further contains rich ionic groups, so that the charge density between the polyester and the disperse dye colloidal particles is improved, the stripped disperse dye can be effectively inhibited from being adsorbed to the surface of the polyester again, the dispersion stability and the stain resistance of the disperse dye are improved, and the removal effect of the disperse dye is further improved, and the color fastness of the polyester is improved.

[0027] Therefore, the acid reduction cleaning process for the dyed polyester and the blended fabric thereof, which uses the anionic dispersion promoter and the acid reduction cleaning agent provided by the application, can obviously remove the surface color of the dyed polyester and the blended fabric thereof, greatly improves the color fastness of the fabric, and can meet the market demand. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only represent some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0029] Figure 1 The mass spectrum of the anionic dispersing promoter prepared for Example 1 is shown in Figure 1. Figure 1 The characteristic peaks represented by reference numerals 1 to 6 correspond to the functional groups represented by reference numerals 1 to 6 in formula (1-1), respectively.

[0030] Figure 2 The infrared spectrum of the anionic dispersing promoter prepared for Example 1 is shown in Figure 2. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described in more detail below. However, it should be understood that the present application can be realized in many different forms and is not limited to the embodiments or examples described herein. On the contrary, the purpose of providing these embodiments or examples is to make the disclosure of the present application more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments or examples and are not intended to limit the present application.

[0033] The improved anionic dispersing promoter of the present application has a structural formula as shown in formula (1), wherein R is selected from C1 to C5 alkylene, n is an integer from 1 to 3, a is an integer from 0 to 5, and b is an integer from 1 to 10.

[0034]

[0035] Preferably, R is selected from C1 to C3 alkylene.

[0036] The anionic dispersing promoter with the special molecular structure has the following advantages: on the one hand, the p-benzoate contained in the structure of the anionic dispersing promoter is similar to the monomer structure of the polyester, so that the anionic dispersing promoter has good affinity with the polyester fiber and has certain plasticizing effect on the polyester, thereby being capable of promoting the dye stripping of the surface layer of the polyester to a certain extent and being beneficial to removing the surface color. On the other hand, the anionic dispersing promoter contains rich benzene ring structures, so that the anionic dispersing promoter has large steric hindrance, strong π-π interaction with the disperse dye, and good affinity with the disperse dye, and the anionic dispersing promoter has excellent dispersing and solubilizing effect on the disperse dye. Meanwhile, the anionic dispersing promoter contains rich ionic groups, so that the charge density between the polyester and the disperse dye colloidal particles is improved, the stripped disperse dye can be effectively inhibited from being adsorbed to the surface of the polyester again, the dispersion stability and the anti-staining property of the disperse dye are improved, and the removal effect of the disperse dye and the color fastness of the polyester are further improved.

[0037] The application further provides a preparation method of the anionic dispersing promoter.

[0038] S1, performing esterification reaction on the first raw material and the second raw material under the action of a catalyst to obtain an intermediate product;

[0039] S2, performing sulfonation treatment on the prepared intermediate product to obtain the anionic dispersing promoter.

[0040] In step S1, the structural formula of the first raw material is shown as formula (2), and the structural formula of the second raw material is shown as formula (3):

[0041]

[0042] In formula (2), n is an integer of 1 to 3, a is an integer of 0 to 5, and b is an integer of 1 to 10; in formula (3), R is selected from C1 to C5 alkylene, preferably, R is selected from C1 to C3 alkylene.

[0043] It should be noted that the values of n, a and b in formula (2) are the values of n, a and b in formula (1), and R in formula (3) is the same as R in formula (1). In addition, when a is 0 in the structures of formula (1) and formula (2), the first raw material is styrene phenol polyoxyethylene ether; when a is an integer of 1 to 5 in the structures of formula (1) and formula (2), the first raw material is styrene phenol polyoxyethylene polyoxypropylene ether.

[0044] The reaction formula of step S1 is as follows:

[0045]

[0046] It should be noted that when the first raw material is styrene polyoxyethylene polyoxypropylene ether, the intermediate product is styrene polyoxyethylene polyoxypropylene ether styrene-based phenol polyoxyethylene-based polyoxypropylene-based alkyl terephthalate product, and when the first raw material is styrene polyoxyethylene ether, the intermediate product is styrene polyoxyethylene polyoxypropylene ether styrene-based phenol polyoxyethylene-based alkyl terephthalate product.

[0047] In an embodiment, the molar ratio of the first raw material to the second raw material is 2.0:1.0 to 2.8:1.0.

[0048] In an embodiment, the mass of the catalyst is 0.1% to 3.5% of the total mass of the first raw material and the second raw material, and the catalyst is selected from at least one of toluenesulfonic acid, triflic acid, phosphotungstic acid, and sodium bisulfite.

[0049] In an embodiment, the esterification reaction comprises mixing and heating the first raw material and the second raw material to 80°C to 90°C, and then mixing with the catalyst at 90°C to 180°C for esterification reaction, wherein the vacuum degree of the esterification reaction is -0.05 MPa to -0.10 MPa, and the time is 3h to 8h.

[0050] Specifically, the first raw material represented by formula (2) and the second raw material represented by formula (3) are mixed at room temperature and heated to 80°C to 90°C, then the catalyst is added, the reaction system is vacuumed, the vacuum degree is controlled to be -0.05 MPa to -0.1 MPa, and the reaction system is heated to 90°C to 180°C, and reacted for 3h to 8h to obtain the intermediate product. At the same time, the by-product water in the reaction process is taken out due to vacuuming, so that the esterification reaction is completely carried out.

[0051] The reaction formula of step S2 is as follows:

[0052]

[0053] In an embodiment, the temperature of the sulfonation treatment is 80°C to 130°C, and the time is 3h to 10h.

[0054] In an embodiment, the sulfonation treatment uses at least one of concentrated sulfuric acid and sulfonyl chloride as a sulfonating agent, and the molar ratio of the sulfonating agent to the first raw material is 1.05:1.0 to 1.2:1.0.

[0055] Specifically, the intermediate product is cooled to below 80°C, the sulfonating agent is added, the temperature of the reaction system is controlled to be 80°C to 130°C, and the reaction is carried out for 3h to 10h, then the reaction system is cooled to below 50°C, a pH adjuster is added to adjust the pH value to 7 to 8, and water is added to control a certain solid content, and finally an anionic dispersion promoter is obtained.

[0056] More particularly, the solid content is 15% to 35%.

[0057] The present application also provides a reducing cleaning process for dyed polyester and blended fabrics thereof, which uses an acidic reducing cleaning agent and the anionic dispersion promoter as described above.

[0058] In the above-mentioned acidic reducing cleaning process for dyed polyester and blended fabrics thereof, the anionic dispersion promoter can significantly remove the floating color on the surface of dyed polyester and blended fabrics thereof in cooperation with the acidic reducing cleaning agent, greatly improve the color fastness of the fabrics, and solve the problems of weak reducing power, low acidic reduction efficiency, and unsatisfactory color fastness of the fabrics after cleaning of the traditional acidic reducing cleaning agent. In addition, the above-mentioned acidic reducing cleaning process not only saves the process of reducing cleaning, but also has excellent cleaning effect.

[0059] In an embodiment, the mass ratio of the acidic reducing cleaning agent to the anionic dispersion promoter is 2:5 to 5:2.

[0060] In an embodiment, the acidic reducing cleaning agent is selected from ivory black powder or ivory black block, and the components of the ivory black powder and the ivory black block are both sodium formaldehyde sulfoxylate.

[0061] In an embodiment, the reducing cleaning process uses an intermittent machine cylinder acidic reducing cleaning treatment process, and uses acid to adjust the pH value of the reducing cleaning system to 4.0 to 5.0, the temperature of the reducing cleaning is 80°C to 90°C, and the time of the reducing cleaning is 20 min to 30 min.

[0062] Preferably, the acid can be a buffer system of glacial acetic acid and sodium acetate, glacial acetic acid, formic acid, or citric acid.

[0063] Hereinafter, the anionic dispersion promoter, the preparation method and the application thereof will be further described through the following specific examples.

[0064] Example 1

[0065] A four-necked flask equipped with a condenser, a thermometer, a dropping funnel and a stirrer was charged with 0.05 mol of styrene phenol polyoxyethylene polyoxypropylene ether and 0.05 mol of 4,4'-diphenyl methane dicarboxylic acid, the structural formulas of the two raw materials were shown in formula (2-1) and formula (3-1) respectively, the temperature was raised to 90°C, 0.10 g of p-toluenesulfonic acid was added, then vacuum was drawn, the vacuum degree was controlled at -0.08 MPa, the reaction liquid was heated to 130°C, and reacted for 5 h. When the temperature was lowered to below 75°C, 0.105 mol of concentrated sulfuric acid was added, the temperature of the reaction system was controlled at 130°C, and reacted for 5 h. When the temperature was lowered to below 50°C, alkali was added to adjust the pH value to about 7 to 8, and water was added to dilute to a solid content of 30%, thus obtaining the required anionic dispersing promoter,

[0066]

[0067] The mass spectrum of the anionic dispersing promoter prepared in Example 1 is shown in Figure 1 , and the infrared spectrum is shown in Figure 2 .

[0068] According to Figure 1 , Figure 2 , the structural formula of the prepared anionic dispersing promoter is shown in formula (1-1), in formula (1-1), the functional groups represented by numbers 1 to 6 correspond to the characteristic peaks represented by numbers 1 to 6 in Figure 1 ,

[0069]

[0070] Example 2

[0071] A four-necked flask equipped with a condenser, a thermometer, a dropping funnel and a stirrer was charged with 0.10 mol of styrene phenol polyoxyethylene polyoxypropylene ether and 0.04 mol of 4,4'-diphenyl propane dicarboxylic acid, the structural formulas of the two raw materials were shown in formula (2-2) and formula (3-2) respectively, the temperature was raised to 90°C, 3.4 g of sodium bisulfite was added, then vacuum was drawn, the vacuum degree was controlled at -0.08 MPa, the reaction liquid was heated to 130°C, and reacted for 5 h. When the temperature was lowered to below 75°C, 0.105 mol of concentrated sulfuric acid was added, the temperature of the reaction system was controlled at 130°C, and reacted for 5 h. When the temperature was lowered to below 50°C, alkali was added to adjust the pH value to about 7 to 8, and water was added to dilute to a solid content of 30%, thus obtaining the required anionic dispersing promoter, the structural formula of the prepared anionic dispersing promoter is shown in formula (1-2),

[0072]

[0073] Example 3

[0074] A four-necked flask equipped with a condenser, a thermometer, a dropping funnel and a stirrer was charged with 0.10 mol of triphenyl ethylene phenol polyoxyethylene polyoxypropylene ether and 0.04 mol of 4,4'-diphenyl methane dicarboxylic acid, the structural formulas of the two raw materials were shown in formula (2-4) and formula (3-4) respectively, the temperature was raised to 90°C, 3.0 g of p-toluenesulfonic acid was added, then vacuum was extracted, the vacuum degree was controlled at -0.08 MPa, the reaction liquid was heated to 130°C, and reacted for 5 h. The temperature was lowered to below 75°C, 0.12 mol of concentrated sulfuric acid was added, the temperature of the reaction system was controlled at 85°C, and the reaction was kept for 5 h. The temperature was lowered to below 50°C, the pH value was adjusted to about 7-8 by adding alkali, and water was added to dilute to a solid content of 30% to obtain the required anionic dispersing promoter. The structural formula of the prepared anionic dispersing promoter was shown in formula (1-4),

[0075]

[0076] Example 4

[0077] A four-necked flask equipped with a condenser, a thermometer, a dropping funnel and a stirrer was charged with 0.10 mol of triphenyl ethylene phenol polyoxyethylene polyoxypropylene ether and 0.04 mol of 4,4'-diphenyl methane dicarboxylic acid, the structural formulas of the two raw materials were shown in formula (2-4) and formula (3-4) respectively, the temperature was raised to 90°C, 3.0 g of p-toluenesulfonic acid was added, then vacuum was extracted, the vacuum degree was controlled at -0.08 MPa, the reaction liquid was heated to 130°C, and reacted for 5 h. The temperature was lowered to below 75°C, 0.12 mol of concentrated sulfuric acid was added, the temperature of the reaction system was controlled at 85°C, and the reaction was kept for 5 h. The temperature was lowered to below 50°C, the pH value was adjusted to about 7-8 by adding alkali, and water was added to dilute to a solid content of 30% to obtain the required anionic dispersing promoter. The structural formula of the prepared anionic dispersing promoter was shown in formula (1-4),

[0078]

[0079]

[0080] Example 5

[0081] Into a four-necked flask equipped with a condenser, a thermometer, a dropping funnel and a stirrer, were added 0.10 mol of tristyrylphenol polyoxyethylene polyoxypropylene ether, 0.04 mol of 4,4'-diphenylmethane dicarboxylic acid, 0.1 g of trifluoromethane sulfonic acid, and the temperature was raised to 90°C. Then, the system was vacuumized to -0.08 MPa, and the reaction solution was heated to 130°C. The reaction was carried out for 5 h. When the temperature was lowered to below 75°C, 0.12 mol of concentrated sulfuric acid was added, and the temperature of the reaction system was controlled at 85°C. The reaction was carried out for 5 h. When the temperature was lowered to below 50°C, the pH value was adjusted to about 7-8 by adding alkali, and the system was diluted with water to a solid content of 30% to obtain the desired anionic dispersing promoter. The structure of the anionic dispersing promoter prepared is shown in formula (1-5),

[0082]

[0083] Blank sample 1

[0084] 4% disperse black ECT dyed polyester mitsunobu.

[0085] Blank sample 2

[0086] 4% disperse black ECT dyed polyester spandex.

[0087] Application example

[0088] Application examples 1-5 all used a batch cylinder acid reduction cleaning treatment process. Blank samples 1 and 2 were cooled to 90°C, and 2 g / L of the anionic dispersing promoter prepared in examples 1-5 and 4 g / L of acid reduction cleaning agent TF-288B were independently added, respectively. The pH value of the working solution was adjusted to 4.5 by adding acid, the reduction cleaning temperature was 90°C, and the cleaning time was 30 min. Then, the solution was drained, washed with water, and dried at 150°C to obtain the reduction cleaned polyester mitsunobu and polyester spandex, respectively.

[0089] Application comparative example 1

[0090] A batch cylinder acid reduction cleaning treatment process was used. Blank samples 1 and 2 were cooled to 90°C, and 6 g / L of acid reduction cleaning agent TF-288B was independently added, respectively. The pH value of the working solution was adjusted to 4.5 by adding acid, the reduction cleaning temperature was 90°C, and the cleaning time was 30 min. Then, the solution was drained, washed with water, and dried at 150°C to obtain the reduction cleaned polyester mitsunobu and polyester spandex, respectively.

[0091] Application comparative example 2

[0092] The blank samples 1 and 2 were discharged, water was added to reheat to 90℃, 3g / L of liquid alkali and 3g / L of sodium hydrosulfite were added, and cleaning was carried out at 90℃ for 30min, then the liquid was discharged, and then water washing was carried out at 40℃, and then drying was carried out at 150℃, to obtain the reduced and cleaned polyester Mictin and polyester four-way stretch fabric, respectively.

[0093] Application Comparative Example 3

[0094] The blank samples 1 and 2 were discharged, water was added to reheat to 90℃, 3g / L of liquid alkali and 3g / L of sodium hydrosulfite were added, and cleaning was carried out at 90℃ for 30min, then the liquid was discharged, and then water washing was carried out at 40℃, and then drying was carried out at 150℃, to obtain the reduced and cleaned polyester Mictin and polyester four-way stretch fabric, respectively.

[0095] The reduced and cleaned textile fabrics of all application examples and application comparative examples and all blank samples were subjected to fastness testing, and the testing indexes and testing methods were as follows:

[0096] Washing color bleeding fastness test: The washing color bleeding fastness test was carried out by GB / T3921-1997 method;

[0097] Sweat color fastness test: The sweat color fastness test was carried out by AATCC-15-1995 method;

[0098] Water soaking color fastness test: The bath ratio was 1:40, and the water bath was heated, i.e. the beaker with water was first placed in a boiling water bath at 100℃, and when the water temperature in the beaker reached above 95℃, the textile fabric was placed in the beaker, stirred, and kept at above 95℃ for 5min, during which the stirring was carried out 3 to 4 times, then the textile fabric was taken out, and the color of the water was observed, if the color depth was deep, it indicated that the color loss was heavy, and the water soaking color fastness was poor, otherwise, if the water was colorless, it indicated that the water soaking color fastness was good;

[0099] Color difference test: The color difference test was carried out by Color Eye 7000A, and the color difference change value before and after the reduced cleaning process was calculated.

[0100] The test results of all application examples and application comparative examples and all blank samples are shown in Table 1.

[0101] Table 1

[0102]

[0103]

[0104] The test results of Table 1 show that by adding the anionic dispersing promoter provided by the application, the color fastness of the dark polyester textile dyed by disperse dyes, especially the polyester-polyamide textile, is significantly improved when the reduction cleaning process is carried out in cooperation with the acid reduction cleaning agent, such as the color fastness to washing, the color fastness to perspiration and the color fastness to water bubble are all improved by 1 to 2 levels, reaching level 4, and the cleaning effect is equivalent to that of the two alkaline reduction cleaning processes, and at the same time, the anionic dispersing promoter provided by the application can realize energy saving and emission reduction when the reduction cleaning is carried out in cooperation with the acid reduction cleaning agent compared with the alkaline reduction cleaning process.

[0105] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0106] The above-mentioned embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An anionic dispersion promoter characterized in that, The anionic dispersing promoter has a structural formula as shown in formula (1-1), formula (1-2), formula (1-3), formula (1-4) or formula (1-5):

2. A process for preparing the anionic dispersion-promoting agent according to claim 1, characterized by, The method comprises the following steps: The first raw material and the second raw material are subjected to esterification under the action of a catalyst to obtain an intermediate product; The prepared intermediate product is subjected to sulfonation treatment to obtain the anionic dispersing promoter; The first raw material has a structural formula as shown in formula (2-1), and the second raw material has a structural formula as shown in formula (3-1); Alternatively, the first raw material has a structural formula as shown in formula (2-2), and the second raw material has a structural formula as shown in formula (3-2); Alternatively, the first raw material has a structural formula as shown in formula (2-3), and the second raw material has a structural formula as shown in formula (3-2); Alternatively, the first raw material has a structural formula as shown in formula (2-4), and the second raw material has a structural formula as shown in formula (3-1); Alternatively, the first raw material has a structural formula as shown in formula (2-5), and the second raw material has a structural formula as shown in formula (3-1); 3. The method for producing an anionic dispersion promoter according to claim 2, characterized by, The molar ratio of the first raw material to the second raw material is 2.0:1.0 to 2.8:1.

0.

4. The method for producing an anionic dispersion promoter according to claim 2, characterized by, The catalyst has a mass of 0.1% to 3.5% of the total mass of the first raw material and the second raw material, and the catalyst is at least one selected from p-toluenesulfonic acid, triflic acid, phosphotungstic acid and sodium bisulfite.

5. The method for preparing an anionic dispersion-promoter according to claim 2, characterized by, The sulfonation treatment uses at least one of concentrated sulfuric acid and sulfonyl chloride as a sulfonation agent, and the molar ratio of the sulfonation agent to the first raw material is 1.05:1.0 to 1.2:1.

0.

6. The method for preparing an anionic dispersion-promoter according to claim 2, characterized by, The esterification reaction comprises: mixing and heating the first raw material and the second raw material to 80-90°C, and then mixing the catalyst at 90-180°C to perform esterification, wherein the vacuum degree of the esterification reaction is -0.05MPa to -0.10MPa, and the time is 3-8h.

7. The method for preparing an anionic dispersion-promoter according to claim 2, characterized by, The sulfonation treatment has a temperature of 80-130°C and a time of 3-10h.

8. A process for reductive cleaning of dyed polyester and its blended fabrics, characterized in that, The reducing cleaning process uses an acidic reducing cleaning agent and the anionic dispersing promoter according to claim 1.

9. The process for reducing cleaning of dyed polyester and its blended fabrics as claimed in claim 8 wherein, The mass ratio of the acidic reducing cleaning agent to the anionic dispersing promoter is 2:5 to 5:2.

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