Scouring agent composition for low-alkali neutralization-free process and preparation method thereof

Abstract

The invention discloses a scouring agent composition for low-alkali neutralization-free process and a preparation method thereof. The scouring agent composition of the present invention, based on its total weight, comprises the following components: 6-10wt% of anionic surfactant of C10-14, 10-25wt% of narrow distribution multi-branched fatty alcohol block polyether surfactant, 2-6wt% of Gemini fatty amine ether surfactant, 2-10wt% of polycarboxylic acid chelating agent, 0.5-2wt% of hydrogen peroxide accelerator, 0.5-2wt% of cosolvent and 48-79wt% of water. The prepared composition is liquid, convenient for adding materials, good permeability, emulsification and dispersibility, low foam, and can realize one-step treatment of scouring and bleaching of cotton cone yarn under low-alkali conditions, and the pH value of the working liquid after treatment is lower than 8, and no acetic acid neutralization is required before the back dyeing, saving processing energy consumption and the use of chemicals, reducing wastewater discharge, and improving production efficiency.

Description

Technical Field

[0001] The invention relates to the field of textile printing and dyeing pretreatment auxiliaries, and in particular to a scouring and bleaching agent composition for a low-alkali neutralization-free process for cotton and its blended yarns and a preparation method thereof. Background Art

[0002] The traditional cotton cone yarn pretreatment is carried out under high temperature and high alkali conditions (98-110℃, caustic soda 1.5-3g / L). High temperature and high alkali can better expand the cottonseed hull, melt and emulsify the cotton wax, and swell and decompose the slurry, making it easier to remove from the fiber. In addition, high temperature and high alkali are excellent catalysts for hydrogen peroxide, which promote the decomposition of hydrogen peroxide to remove pigments, thereby achieving excellent impurity removal effect and uniformity. However, the long-term high temperature and high alkali of this process will cause great damage to the cotton fibers. The pH value of the working liquid after treatment is high. It is necessary to remove the residual hydrogen peroxide, neutralize, and wash before the subsequent dyeing treatment, which is water-consuming and time-consuming. In addition, due to its special processing method, the impurities after the cone yarn pretreatment are very easy to adhere to the inner and outer walls of the cone yarn, resulting in uneven treatment of the inner, middle and outer layers, affecting the subsequent dyeing. In response to the above problems, low-alkali neutralization-free scouring and bleaching agents are receiving more and more attention.

[0003] At present, low-alkali pretreatment is mainly achieved by the following two methods. One is to use biological scouring enzymes for scouring, which is mainly a mixture of alkaline pectinase and cellulase. However, due to the complex impurities on cotton fibers, the enzymes have poor removal of wax, cottonseed hulls, etc., and the hydrophilicity of the treated textiles is poor. The residual cottonseed hulls on the fabrics will cause uneven dyeing, especially for light-colored varieties. Moreover, most enzymes cannot be used in the same bath with hydrogen peroxide. At present, enzyme pretreatment is mostly a one-bath two-step method, which is long, time-consuming and energy-consuming. Another way is to use a hydrogen peroxide activator or catalyst to promote the decomposition of hydrogen peroxide under low-alkali conditions, thereby achieving scouring and bleaching of cotton fabrics. The activators that have been studied more are mainly tetraacetylethylenediamine (TAED), sodium nonanoyloxybenzenesulfonate (NOBS), N-[4-(triethylammonium methylenebenzoyl)] caprolactam chloride (TBCC), guanidine derivatives, etc., such as patents CN 103910712B and CN 109468825B. However, there are still several problems with the use of this type of substance in industrialization: (1) It cannot be prepared into a solution in advance. Aqueous solutions such as TAED and TBCC are easily hydrolyzed; (2) It has low water solubility and large dosage. During use, it cannot be prepared with surfactants to form a scouring agent; (3) It is difficult to synthesize and is expensive. Currently, only TAED and NOBS have achieved industrialization.

[0004] In addition, the metal catalysts that work best in the low-alkali neutralization-free process are copper-ion-containing catalysts, but this type of substance has a strong damage to cotton fiber strength, and the copper ion content in the scouring agent is basically 1000-1500ppm, such as patent CN103276583B, which does not meet the GOTS regulations that the copper ion content in chemicals should be less than 250ppm.

[0005] In summary, there is no scouring agent currently used in low-alkali and neutralization-free processes that can achieve excellent scouring effects, cause less fiber strength damage, and have both cost-effectiveness and environmental protection performance. Therefore, it is of great practical value to develop a scouring agent for low-alkali and neutralization-free processes that meets the above requirements. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a scouring agent composition for a low-alkali neutralization-free process and a preparation method thereof. When used in the pretreatment of cotton tube yarn, it can not only obtain textiles with uniform and thorough whiteness, hair effect, and low fiber damage, but also reduce the COD (chemical oxygen demand) value and pH value of wastewater, reduce the neutralization process of textiles after pretreatment, save water and reduce consumption, and the scouring agent does not contain APEO (alkylphenol polyoxyethylene ether compounds), phosphorus and metal ions, etc., and is environmentally friendly.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] One aspect of the present invention provides a scouring agent composition for low-alkali neutralization-free process, which comprises the following components based on the total weight of the scouring agent composition:

[0009] C10-14 anionic surfactant: 6-10wt%,

[0010] Narrow distribution multi-branched fatty alcohol block polyether surfactant: 10-25wt%,

[0011] Gemini fatty amine ether surfactant: 2-6wt%,

[0012] Polycarboxylic acid chelating agent: 2-10wt%,

[0013] Hydrogen peroxide accelerator: 0.5-2wt%,

[0014] Cosolvent: 0.5-2wt%, and

[0015] Water: 48-79 wt%.

[0016] The C10-14 anionic surfactant is one or more of isomeric alcohol ether sulfates, isomeric alcohol ether carboxylates and secondary alkyl sulfonates.

[0017] The cosolvent is one or more of ethylene glycol, polyethylene glycol 200, polypropylene glycol 400, and cumene sulfonate.

[0018] Further, the carbon chain length of the narrow distribution multi-branched fatty alcohol block polyether surfactant is C12-18, the branching degree is 2-5, the EO (polyoxyethylene) number is 3-6, for example, it can be 3EO, 4EO, 5EO, 6EO, the PO (polyoxypropylene) number is 3-8, for example, it can be 3PO, 4PO, 5PO, 6PO, 7PO, 8PO, and the proportion of the EO number to the total number of EO and PO is 30-50%. The narrow distribution in the narrow distribution multi-branched fatty alcohol block polyether surfactant refers to the narrow distribution of EO and PO. For example, taking 5EO and 6PO as an example, other products are generally distributed in 1-9EO and 1-11PO, but their average values ​​are 5EO and 6PO, while the narrow distribution is distributed in 4-7EO and 4-8PO, that is, the distribution range of its EO and PO is within half of that of other products. The multi-branched chain in the narrow distribution multi-branched fatty alcohol block polyether surfactant is relative to the straight chain and isomeric fatty alcohol, for example, in the present invention, the branching degree is 2 to 5. The narrow distribution multi-branched fatty alcohol block polyether surfactant has good emulsification power and low foam, and can improve the uniformity and cleanliness of the treated textiles.

[0019] In this field, the so-called Gemini surfactant is a twin surfactant, which is a surfactant in which two or more traditional surfactant molecules are connected together by a linking group, and is generally composed of at least two hydrophobic groups, two hydrophilic groups and one linking group.

[0020] Further, in the present invention, the Gemini fatty amine ether surfactant is one or more of fatty alcohol polyether alkyl ammonium chloride, dichlorodiphenyl alkyl polyether ethyl ammonium, and diphenyl alkyl polyether ammonium chloride, and its structural formula is as follows:

[0021]

[0022] Wherein: n is an even number between 8 and 16, m is an even number between 8 and 14; a is an integer between 10 and 30.

[0023] Furthermore, the polycarboxylic acid chelating agent is one or more of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, carboxylate-sulfonate-nonionic terpolymer, and sodium polyepoxysuccinate.

[0024] Furthermore, in the polycarboxylic acid chelating agent, the molecular weight of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 1500-4000, the molecular weight of carboxylate-sulfonate-nonionic terpolymer is 2700-5000, and the molecular weight of sodium polyepoxysuccinate is 900-1500.

[0025] Furthermore, the hydrogen peroxide accelerator is one or more of oxazine naphthalene or oxazine naphthalene imide compounds, and the structural formula thereof is as follows:

[0026]

[0027] In the formula: R1 and R4 are each independently phenyl, p-tolyl, C1-3 alkyl or C1-3 alkoxy, R2, R3, R5 and R6 are each independently H or C1-4 alkyl, wherein n and m are each independently an integer of 1 to 6, and R7 is

[0028] Another aspect of the present invention provides a method for preparing a scouring agent composition for a low-alkali neutralization-free process, which comprises the following steps:

[0029] (1) adding 30-50 wt% water, a cosolvent, a polycarboxylic acid chelating agent, and a hydrogen peroxide accelerator into a reaction kettle, and stirring at 40-50° C. until the mixture is uniformly mixed;

[0030] (2) adding a C10-14 anionic surfactant, a narrow distribution multi-branched fatty alcohol block polyether surfactant, a Gemini fatty amine ether surfactant and the remainder of water to the mixture formed in step (1), and continuing to stir at 60-70° C. for 20-40 minutes until the solution is uniformly mixed;

[0031] (3) Cooling to below 40° C. to obtain the low-alkali water-free scouring and bleaching agent composition.

[0032] Compared with the prior art, the present invention has the following advantages: The originality of the scouring and bleaching agent of the present invention is manifested in the following aspects: (1) The Gemini fatty amine ether surfactant and polycarboxylic acid chelating agent used have high dispersibility and strong anti-re-staining ability, and the narrow distribution multi-branched fatty alcohol block polyether surfactant has good emulsifying power and low foaming, which can improve the uniformity and cleanliness of the treated textiles; (2) The oxynitrile hydrogen peroxide accelerator can catalyze the decomposition of hydrogen peroxide under low-alkali conditions, has strong delignification ability, and can be combined with the polycarboxylic acid chelating agent to make the treated textiles have high whiteness and less fiber strength damage; (3) The raw materials do not contain APEO, phosphorus, heavy metals and other substances, and are environmentally friendly.

[0033] The scouring and bleaching agent composition prepared by the present invention for low-alkali neutralization-free process is liquid, convenient for adding materials, and convenient for production operation. The composition has good permeability, emulsification, and dispersibility, low foam, and can realize one-step scouring and bleaching of cotton cone yarn under low-alkali conditions. The pH value of the working liquid after treatment is lower than 8, and acetic acid neutralization is not required before the subsequent dyeing, which saves processing energy consumption and the use of chemicals, reduces wastewater discharge, and improves production efficiency. The yarn after treatment has good uniformity, small difference between the inner, middle and outer layers, better whiteness, hair effect, strength and fiber polymerization degree than the traditional process, the COD value of the wastewater is lower than the conventional process and the wastewater discharge is small, and after the subsequent dyeing, it is especially light-colored, bright in color and has no color difference with the traditional process. The composition does not contain APEO, phosphorus and heavy metals, is environmentally friendly, and has a comprehensive effect that is significantly better than conventional scouring and bleaching agents. DETAILED DESCRIPTION

[0034] Example

[0035] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the present invention. It should be understood here that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

[0036] The application verification of the scouring and bleaching agent for low-alkali neutralization-free process of the present invention is verified by the following experiments.

[0037] 1 Experimental content

[0038] 1.1 Textiles: Cotton yarn (32s single yarn)

[0039] 1.2 Scouring agent: conventional scouring agent (liquid, commercially available), commercially available low-alkali scouring agent 1 (solid), commercially available low-alkali scouring agent 2 (liquid), scouring agent of the embodiment of the present invention

[0040] 1.3 Application process:

[0041] 1.3.1 Pretreatment process:

[0042] Traditional process: conventional scouring agent 1.5g / L, NaOH 2.0g / L, H2O2 (30%) 8g / L

[0043] Heating from 40℃ to 98℃ (heating rate 3℃ / min) → keeping at 98℃×60min → deoxygenation by deoxygenase at 60℃×10min → neutralization with acetic acid at 50℃×10min → washing and dyeing

[0044] Low alkali process: low alkali scouring agent 1.5g / L, NaOH 0.6g / L, H2O2 (30%) 8g / L

[0045] Heating from 40℃ to 98℃ (heating rate 3℃ / min) → keeping at 98℃×60min → deoxygenating by deoxygenase at 60℃×10min → washing and dyeing

[0046] 1.3.2 Dyeing

[0047] Formula: Yagersu Cuilan G 133% (Shanghai Yayun) 1.0% owf, 60g / L sodium sulfate,

[0048] Soda ash 15g / L, commercial soap detergent

[0049] Dyeing process: dyeing at 40℃ → heating to 80℃ (heating rate 2℃ / min) → adding sodium sulfate three times (5 minutes interval) → keeping at 80℃ for 30 minutes → adding soda ash three times (5 minutes interval) → keeping at 80℃ for 60 minutes → cooling → cold water washing at 40℃×10min → neutralizing with acetic acid at 50℃×10min → warm water washing at 60℃×10min → soap washing at 98℃×20min (commercial soaping agent 2g / L) → warm water washing → cold water washing

[0050] 2 Performance Test

[0051] 2.1 Foaming

[0052] The Roche foamer method was used to test the foaming performance of 1g / L sample solution at 30°C. The smaller the data, the lower the foam of the scouring agent, which is more beneficial to production and processing.

[0053] 2.2 Determination of APEO, total phosphorus and metal ion content in bleaching agent

[0054] According to GB / T23972-2009 "Determination of alkylphenols and alkylphenol polyoxyethylene ethers in textile dyeing and finishing auxiliaries - High performance liquid chromatography / mass spectrometry", the APEO content in the auxiliaries is tested. The lower the test value, the more environmentally friendly the scouring and bleaching agent is.

[0055] The total phosphorus content in the bleaching agent is determined according to GB / T 11893-1989 "Determination of total phosphorus in water quality - Ammonium molybdate spectrophotometric method". The lower the test value, the less adverse impact the bleaching agent has on the environment.

[0056] The metal ion content in the bleaching agent is tested according to the EN 16711-1:2015 standard. The lower the value, the more environmentally friendly the bleaching agent is.

[0057] 2.3 Fabric whiteness and hair effect

[0058] The treated textile was folded into four layers and its CIE whiteness was tested using Datacolor 650. The higher the value, the better the whiteness.

[0059] The treated textiles are tested for capillary effect according to FZ / T01071-2008 method. The higher the value, the better the capillary effect.

[0060] 2.4 Yarn strength and fiber polymerization degree

[0061] The yarn strength is measured according to GB / T3916-2013 "Determination of breaking strength and breaking elongation of single yarn in textile packaged yarn (CRE method)". The larger the test value, the higher the yarn strength and the smaller the effect of pre-treatment on the yarn strength.

[0062] The fiber polymerization degree is measured according to the "Copperammonia Solution Method for Determining the Polymerization Degree of Cotton Fibers". The larger the value, the less damage the cotton fiber has.

[0063] 2.5COD value test and pH value test

[0064] Collect the wastewater discharged after bleaching, and measure the COD using LH-3BA UV-visible multi-parameter water quality meter according to the "Chemical Oxygen Demand Meter Calibration Procedure". The lower the value, the lower the COD value of the wastewater.

[0065] The pH value was determined according to HG / T 4164-2010 “Determination of pH value of textile dyeing and finishing auxiliaries”.

[0066] 2.6 Apparent color depth K / S value of the sample

[0067] The Datacolor 650 colorimeter was used to measure the color of the yarns dyed after various treatments, using a D65 light source and a 10° observation angle. The K / S value at the maximum absorption wavelength was recorded. The larger the value, the darker the color.

[0068] Example 1

[0069] 32g of deionized water, 2g of polyethylene glycol 200, 3g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (weight average molecular weight 2500, purchased from Shandong Taihe) and 0.9g of formula 1-1 and 0.6g of formula 2-1 were heated to 40°C and stirred at 300rpm for 15min until mixed evenly, and then 10g of isomeric decanol polyoxyethylene ether sulfate OEC-100C (purchased from Hangzhou Kecheng) and 12g of narrow distribution multi-branched fatty alcohol were added. Block polyether surfactant RP450 (C12-14, branching degree of 4-5, EO number of 4, PO number of 8, EO content of about 33%, purchased from Shanghai Zimei Chemical), 4g of dodecanol polyoxyethylene ether (18EO) dimethyl octylammonium chloride, 2g of disoctyl polyoxyethylene ether (12EO) ammonium chloride and 33.5g of water, heated to 60°C and continued to stir at 300rpm for 40 minutes, cooled and discharged, to obtain scouring agent 1, with a solid content of 33.5%.

[0070]

[0071] Example 2

[0072] 20g of deionized water, 1g of ethylene glycol, 5g of carboxylate-sulfonate-nonionic terpolymer TH-3100 (weight average molecular weight 3000, purchased from Shandong Taihe) and 1.2g of formula 1-2 and 0.8g of formula 2-2 were heated to 40°C and stirred at 300rpm for 15min until uniformly mixed, and then 6g of sodium secondary alkyl sulfonate H-95 (purchased from LANXESS, Germany), 20g of narrow distribution multi-branched fatty alcohol block polyether surfactant OE52 (C16-18, degree of branching is 2, EO number is 3, PO number is 5, EO content is about 37%, purchased from Sasol Chemical), 4g of dichlorodihexadecyl polyoxyethylene ether (15EO) ethylammonium and 42g of water were added, the temperature was raised to 70°C and stirring was continued at 300rpm for 30 minutes, the material was cooled and discharged to obtain scouring agent 2, and the solid content was measured to be 33.2%.

[0073]

[0074] Example 3

[0075] 36g of deionized water, 2g of sodium cumene sulfonate, 5g of sodium polyepoxysuccinate PESA (weight average molecular weight 1200, purchased from Shandong Taihe) and 2g of carboxylate-sulfonate-nonionic terpolymer TH-4500 (weight average molecular weight 4500, purchased from Shandong Taihe), 0.5g of formula 1-3 and 0.5g of formula 2-3 were heated to 40°C and stirred at 300rpm for 20min until uniformly mixed, and 4g of sodium isomeric alcohol ether sulfate TES (purchased from Sasol Chemical) and 4g of sodium isomeric alcohol ether sulfate ES were added. 66 (purchased from Jiangsu Saike), 22g of narrow distribution multi-branched fatty alcohol block polyether surfactant FK64 (C12, branching degree is 2-3, EO number is 4, PO number is 6, EO content is about 40%, purchased from Sasol Chemical), 1g of hexadecanol polyoxyethylene ether (15EO) dimethyl dodecyl ammonium chloride and 2g of dioctyl polyoxyethylene ether (10EO) ethyl ammonium dichloride and 21g of water, heat to 65°C and continue stirring at 300rpm for 20 minutes, cool and discharge the material to obtain scouring agent 3, and the solid content is measured to be 35.1%.

[0076]

[0077] Application comparison

[0078] The scouring agents prepared in Examples 1-3 and commercially available low-alkali scouring agents 1 (solid, solid content 89.9%) and 2 (liquid, solid content 32.2%) were compared with conventional scouring agents (liquid, solid content 29.88%), and applied to cotton tube yarns. The test results are as follows:

[0079] Table 1 Comparison of basic performance of the scouring agent of the present invention and market products

[0080]

[0081] Note: The detection limit of APEO is 10ppm, the detection limit of total phosphorus content is 0.002ppm, and the detection limit of metal ions is 10ppm.

[0082] It can be seen from the data in Table 1 that the foaming property of the scouring and bleaching agent of the present invention is significantly better than that of commercially available products, the probability of producing dyeing defects is lower, and no APEO, phosphorus, or metal ions are detected, which is more in line with the relevant standard requirements of the textile industry.

[0083] Table 2 Comparison of pre-treatment effects of the scouring agent of the present invention and the scouring agent on the market

[0084]

[0085] Note: Blank refers to cotton yarn without pretreatment;

[0086] After being treated with the commercially available low-alkali scouring and bleaching agent 1, a small amount of white ash appeared during the yarn reversing process.

[0087] It can be seen from the data in Table 2 that the cotton yarn treated with the scouring agent of the present invention has greatly improved whiteness, hair effect, strength and fiber polymerization degree compared with the conventional scouring agent of the traditional process and the commercially available products of the low-alkali neutralization-free process. The commercially available products have a greater damage to the fiber strength, and the whiteness and hair effect of different positions after treatment vary greatly, especially the whiteness and hair effect of the inner layer of the yarn are poor, which is not conducive to the uniformity of subsequent dyeing.

[0088] Table 3 Comparison of residual liquid after scouring and bleaching agent of the present invention and market products

[0089]

[0090] Note: The detection limit of COD value is 20mg / L

[0091] It can be seen from the data in Table 3 that, compared with conventional scouring agents and commercially available scouring agents, the pH value of the working liquid after scouring with the scouring agent of the present invention is lower, and the COD value of the residual liquid after scouring is also lower, indicating that the scouring agent of the present invention can reduce the sewage discharge pressure, can directly remove the dyeing without neutralization after pre-treatment, save water, and improve production efficiency.

[0092] Table 4 Comparison of fabric dyeing performance after scouring and bleaching agent of the present invention and market products

[0093]

[0094] It can be seen from the data in Table 4 that the yarns treated with the low-alkali neutralization-free process and the traditional process are dyed with light colors. The experimental results show that the yarns treated with the scouring agent of the present invention are darker in color than the conventional scouring agent and the commercially available product after dyeing, and the difference in color depth between the inner, middle and outer layers is small. The obtained yarns are more uniform and the quality of the textiles is higher.

[0095] In summary, the scouring agent of the present invention has good low foaming and environmental protection, is easy to use, and meets the requirements of relevant laws and regulations. It is used in the low-alkali water-free washing process. After treatment, the whiteness, hair effect, fiber damage, dyeing color, inner and outer layer difference, and COD value of scouring wastewater of the textile are better than similar products on the market. Compared with the traditional process, it improves the quality of textiles, saves processing time, water, electricity, etc., and improves production efficiency.

Claims

1. A scouring agent composition for low-alkali neutralization-free process, based on the total weight of the scouring agent composition, comprising the following components: C10-14 anionic surfactant: 6-10wt%, Narrow distribution multi-branched fatty alcohol block polyether surfactant: 10-25wt%, Gemini fatty amine ether surfactant: 2-6wt%, Polycarboxylic acid chelating agent: 2-10wt%, Hydrogen peroxide accelerator: 0.5-2wt%, Cosolvent: 0.5-2wt%, and Water: 48-79 wt%; in, The C10-14 anionic surfactant is one or more of isomeric alcohol ether sulfates, isomeric alcohol ether carboxylates and secondary alkyl sulfonates; The cosolvent is one or more of ethylene glycol, polyethylene glycol 200, polypropylene glycol 400, and cumene sulfonate; The narrow distribution multi-branched fatty alcohol block polyether surfactant has a carbon chain length of C12-18, a branching degree of 2-5, an EO number of 3-6, a PO number of 3-8, and a ratio of EO number to the total number of EO and PO of 30-50%; The Gemini fatty amine ether surfactant is one or more of fatty alcohol polyether alkyl ammonium chloride, dichlorodiphenyl alkyl polyether ethyl ammonium, and diphenyl alkyl polyether ammonium chloride, and its structural formula is as follows: Wherein: n is an even number between 8 and 16, m is an even number between 8 and 14; a is an integer between 10 and 30; The polycarboxylic acid chelating agent is one or more of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, carboxylate-sulfonate-nonionic terpolymer, and sodium polyepoxysuccinate; The hydrogen peroxide accelerator also comprises oxazine naphthalene and oxazine naphthalene imide compounds of the following structural formulas: In the formula: R1 and R4 are each independently phenyl, p-tolyl, C1-3 alkyl or C1-3 alkoxy, R2, R3, R5 and R6 are each independently H or C1-4 alkyl, or wherein n and m are each independently an integer of 1 to 6, and R7 is 2. The scouring and bleaching agent composition according to claim 1, wherein in the polycarboxylic acid chelating agent, the weight average molecular weight of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 1500-4000, the weight average molecular weight of the carboxylate-sulfonate-nonionic terpolymer is 2700-5000, and the weight average molecular weight of the sodium polyepoxysuccinate is 900-1500.

3. The method for preparing the scouring and bleaching agent composition according to claim 1 or 2, comprising the steps of: (1) adding 30-50 wt % of water, a cosolvent, a polycarboxylic acid chelating agent, and a hydrogen peroxide accelerator into a reaction kettle, and stirring at 40-50° C. until the mixture is uniformly mixed; (2) adding a C10-14 anionic surfactant, a narrow distribution multi-branched fatty alcohol block polyether surfactant, a Gemini fatty amine ether surfactant and the remainder of water to the mixture formed in step (1), and continuing to stir at 60-70° C. for 20-40 minutes until the solution is uniformly mixed; (3) Cooling to below 40° C. to obtain the scouring agent composition for low-alkali neutralization-free process.

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