Low-temperature debarking and scouring agent and preparation method thereof

Abstract

This application discloses a low-temperature debleaching and scouring agent and its preparation method. On one hand, this application provides a low-temperature debleaching and scouring agent, wherein the mass ratio of each component of the scouring agent includes: 4-8 parts of fatty alcohol polyoxyethylene ether, 2-10 parts of isomeric alcohol polyoxyethylene ether, 1-4 parts of alkyl glycoside, 2-8 parts of alkylamine ester, 10-16 parts of sodium polyacrylate, and 62-74 parts of deionized water; the scouring agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0-1.5%. On the other hand, this application also provides a method for preparing the above-mentioned low-temperature debleaching and scouring agent. This application exhibits excellent degumming, dewaxing, and impurity removal effects, imparting superior wicking effect and whiteness to fabrics, with good environmental friendliness and minimal damage to fabrics.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to a low-temperature debleaching and scouring agent and its preparation method. Background Technology

[0002] Bleaching and de-bleaching is one of the core processes in textile processing. It is a crucial pretreatment process that directly determines the quality of the processed textiles. The purpose of bleaching and de-bleaching is to remove impurities (such as residual gums, proteins, waxes, and pigments) from natural fiber fabrics, thereby obtaining a pure, white base fabric with good hydrophilicity, providing high-quality intermediate fabrics for subsequent processing.

[0003] Given my country's increasing emphasis on low-carbon and energy-saving development in recent years, bleaching processes have gradually evolved from traditional high-temperature alkaline oxygen treatment to low-temperature bleaching processes. Existing low-temperature bleaching processes mainly include low-temperature enzymatic bleaching and hydrogen peroxide low-temperature activation bleaching. Due to the higher cost of low-temperature enzymatic bleaching, hydrogen peroxide low-temperature activation bleaching is more widely used. In the hydrogen peroxide low-temperature activation bleaching process, the ability to effectively remove impurities remaining in the fabric is crucial to the process quality. The bleaching effect of the hydrogen peroxide low-temperature activation bleaching process differs somewhat from that of the traditional high-temperature alkaline oxygen treatment, resulting in more residual impurities in the fabric, including more gums, waxes, and proteins, which are relatively difficult to remove.

[0004] Adding refining agents to remove the aforementioned impurities and improve fabric performance is a common method used in low-temperature activation bleaching processes using hydrogen peroxide. Existing refining agents mainly consist of surfactants and chelating agents. While effectively removing contaminants, they desorb residual impurities such as gums, waxes, and proteins adhering to the fabric, followed by emulsification and removal, thereby improving fabric quality. Most existing refining agents are prepared using sodium benzenesulfonate surfactants and polyoxyethylene ether surfactants, as well as chelating agents such as EDTA and DTPA, supplemented with various auxiliaries. However, these refining agents suffer from problems such as relatively insufficient penetration, unsatisfactory impurity removal effect, damage to fabric fibers, and pollution emissions. Summary of the Invention

[0005] In order to solve at least one of the above-mentioned technical problems, and to develop a debleaching and refining agent with excellent degumming, dewaxing and impurity removal effects, which can impart better wicking effect and whiteness to fabrics, good environmental protection and minimal damage to fabrics, this application provides a low-temperature debleaching and refining agent and its preparation method.

[0006] This application provides a low-temperature debleaching and refining agent, wherein the components of the refining agent are proportioned as follows: 4-8 parts of fatty alcohol polyoxyethylene ether, 2-10 parts of isomeric alcohol polyoxyethylene ether, 1-4 parts of alkyl glycoside, 2-8 parts of alkylamine ester, 10-16 parts of sodium polyacrylate, and 62-74 parts of deionized water; the refining agent also includes sodium hydroxide, wherein the final concentration of sodium hydroxide added is 1.0-1.5%.

[0007] Optionally, the refining agent comprises the following components in the following mass proportions: 4-6 parts of fatty alcohol polyoxyethylene ether, 4-6 parts of isomeric alcohol polyoxyethylene ether, 2-3 parts of alkyl glycoside, 3-5 parts of alkylamine ester, 10-12 parts of sodium polyacrylate, and 68-70 parts of deionized water; the refining agent also includes sodium hydroxide, wherein the final concentration of sodium hydroxide added is 1.1-1.3%.

[0008] Further optionally, the refining agent comprises the following components in the following mass proportions: 5 parts fatty alcohol polyoxyethylene ether, 6 parts isomeric alcohol polyoxyethylene ether, 2 parts alkyl glycoside, 4 parts alkylamine ester, 12 parts sodium polyacrylate, and 69.5-70 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.2%.

[0009] Optionally, the sodium polyacrylate is selected from products with a molecular weight of 2400 to 5000.

[0010] Optionally, the refining agent further includes an antifoaming agent, wherein the amount of antifoaming agent added is 0.04 to 0.08 parts.

[0011] Alternatively, the defoamer may be a polysiloxane or a modified polysiloxane defoamer.

[0012] On the other hand, this application also provides a method for preparing the above-mentioned low-temperature debleaching and refining agent, including the following steps:

[0013] S1. Accurately weigh each component according to the formula;

[0014] S2. Add the alkyl glycoside and alkyl amino ester weighed in step S1 to deionized water, stir and mix for more than 3 minutes, add the amount of sodium hydroxide in the formula, and continue to stir and mix for more than 5 minutes to obtain a mixture.

[0015] S3. Under stirring conditions, add the formulated amounts of fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether to the mixture obtained in step S2 in sequence, and continue stirring and mixing for more than 8 minutes to obtain a secondary mixture.

[0016] S4. Add the prescribed amount of sodium polyacrylate to the secondary mixture obtained in step S3, stir and mix for more than 30 minutes to obtain a refined mixture.

[0017] S5. Defoaming treatment is performed on the refining mixture obtained in step S4 to obtain a low-temperature debleaching refining agent.

[0018] Optionally, in steps S2 and S3, the stirring speed is controlled at 40~80 rpm.

[0019] Optionally, in step S4, the stirring speed is controlled at 120~200 rpm.

[0020] Optionally, in step S4, the defoaming treatment is performed by adding a defoaming agent and allowing it to stand for defoaming.

[0021] In summary, the present invention has at least one of the following beneficial technical effects:

[0022] 1. This application uses fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether as the main surfactants, combined with a certain amount of alkyl glycosides and alkylamine esters, and supplemented with sodium polyacrylate to enhance the detergency and impurity removal effect. The entire formulation design has excellent alkali resistance and can effectively achieve the detergency and refining effect at low temperature. Moreover, the selected surfactants have relatively excellent biodegradability and are environmentally friendly.

[0023] 2. The refining agent of this application has excellent properties in removing oil, wax, residual protein, and residual colloids, and has good permeability. It can thoroughly remove various stains and impurities on fabrics and effectively reduce the water consumption in the debleaching process.

[0024] 3. The refining agent of this application has a moderate pH value, and the overall composition ratio causes minimal damage to the fabric. It can impart better wicking effect and whiteness to the fabric, while effectively maintaining the tear strength of the fabric.

[0025] 4. The refining agent of this application has a simple preparation method, easy preparation steps, and relatively high preparation efficiency. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments.

[0027] This application provides a low-temperature debleaching and refining agent, wherein the components of the refining agent are proportioned as follows: 4-8 parts of fatty alcohol polyoxyethylene ether, 2-10 parts of isomeric alcohol polyoxyethylene ether, 1-4 parts of alkyl glycoside, 2-8 parts of alkylamine ester, 10-16 parts of sodium polyacrylate, and 62-74 parts of deionized water; the refining agent also includes sodium hydroxide, wherein the final concentration of sodium hydroxide added is 1.0-1.5%.

[0028] The preparation method of the above-mentioned low-temperature debleaching and refining agent of this application includes the following steps:

[0029] S1. Accurately weigh each component according to the formula;

[0030] S2. Add the alkyl glycoside and alkyl amino ester weighed in step S1 to deionized water, stir and mix for more than 3 minutes, add the amount of sodium hydroxide in the formula, and continue to stir and mix for more than 5 minutes to obtain a mixture.

[0031] S3. Under stirring conditions, add the formulated amounts of fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether to the mixture obtained in step S2 in sequence, and continue stirring and mixing for more than 8 minutes to obtain a secondary mixture.

[0032] S4. Add the prescribed amount of sodium polyacrylate to the secondary mixture obtained in step S3, stir and mix for more than 30 minutes to obtain a refined mixture.

[0033] S5. Defoaming treatment is performed on the refining mixture obtained in step S4 to obtain a low-temperature debleaching refining agent.

[0034] Existing refining agents extensively utilize various surfactants with excellent cleaning properties and chelating agents that effectively remove impurities from fabrics. While they offer good cleaning effects, they are less than ideal in removing wax, residual protein, and residual colloids. The core reason is that the debleaching process, driven by efficiency requirements, increasingly demands longer debleaching times. Refining agents struggle to effectively penetrate the fabric within a short period, making it difficult to remove impurities from within the fabric. Although current technologies employ various auxiliaries to enhance the penetrability of the refining agent, the removal effect is still difficult to guarantee under low-temperature conditions. Furthermore, the introduction of various auxiliaries increases the pollution of debleaching wastewater, significantly reducing its environmental friendliness.

[0035] To address the problems of the prior art, this application presents a novel debleaching and refining agent formulation. It uses fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether as the main surfactants, supplemented with a certain amount of alkyl glycosides and alkylamine esters, and further enhanced with sodium polyacrylate to improve detergency and impurity removal. Alkyl glycosides effectively remove adhesive and protein residues from fabrics. Fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether have good detergency and emulsification effects. The introduction of alkylamine esters not only significantly improves the system's permeability but also synergistically enhances the system's impurity removal and emulsification effects. Sodium polyacrylate possesses specific amphiphilic properties, exhibiting a certain chelating effect and enhancing detergency. This refining agent formulation effectively solves the problems of insufficient low-temperature impurity removal and insufficient permeability found in existing refining agents. Furthermore, this application uses a full surfactant formulation, and most of the selected surfactants are biodegradable, ensuring that the fabric has almost no refining agent residue after debleaching treatment, resulting in excellent environmental performance.

[0036] The following are embodiments of this application.

[0037] All major raw materials used in the embodiments of this application are commercially available. Among them, fatty alcohol polyoxyethylene ether, model Disponil A 3065, was purchased from BASF; isomeric alcohol polyoxyethylene ether, model EH-9, was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; alkyl glycoside was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; alkylamine ester was purchased from Hubei Langbowan Biomedical Co., Ltd.; sodium polyacrylate was purchased from Wuhan Chundu Biotechnology Co., Ltd.; polysiloxane defoamer, model LT-7, was purchased from Wenzhou Longtai Chemical Co., Ltd.; and modified polysiloxane defoamer, model IOTA 1852, was purchased from Anhui Aiyota Silicone Oil Co., Ltd.

[0038] Example 1

[0039] The low-temperature debleaching and refining agent of this embodiment comprises the following components in the following mass ratios: 4 parts fatty alcohol polyoxyethylene ether, 10 parts isomeric alcohol polyoxyethylene ether, 1 part alkyl glycoside, 8 parts alkylamine ester, 10 parts sodium polyacrylate, and 66 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0%.

[0040] The preparation method of the low-temperature debleaching and refining agent in this embodiment includes the following steps:

[0041] S1. Accurately weigh each component according to the formula;

[0042] S2. Add the alkyl glycoside and alkylamine ester weighed in step S1 to deionized water, stir and mix at 60 rpm for 3 minutes, then add the amount of sodium hydroxide in the formula, and continue stirring and mixing for 5 minutes to obtain a mixture.

[0043] S3. Under stirring at 60 rpm, add the formulated amounts of fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether to the mixture obtained in step S2 in sequence, and continue stirring and mixing for 8 minutes to obtain a secondary mixture.

[0044] S4. Add the prescribed amount of sodium polyacrylate to the secondary mixture obtained in step S3, and stir and mix at 160 rpm for 30 minutes to obtain a refined mixture.

[0045] S5. The refined mixture obtained in step S4 is allowed to stand for defoaming treatment to obtain a low-temperature debleaching and refining agent.

[0046] Example 2

[0047] The difference between this embodiment and Embodiment 1 is that the low-temperature debleaching and refining agent in this embodiment has the following component mass ratios: 8 parts fatty alcohol polyoxyethylene ether, 2 parts isomeric alcohol polyoxyethylene ether, 4 parts alkyl glycoside, 2 parts alkylamine ester, 16 parts sodium polyacrylate, and 68 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0%.

[0048] Example 3

[0049] The difference between this embodiment and Embodiment 1 is that the low-temperature debleaching and refining agent in this embodiment has the following component mass ratios: 6 parts fatty alcohol polyoxyethylene ether, 8 parts isomeric alcohol polyoxyethylene ether, 2 parts alkyl glycoside, 6 parts alkylamine ester, 15 parts sodium polyacrylate, and 62 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0%.

[0050] Example 4

[0051] The difference between this embodiment and Embodiment 1 is that the low-temperature debleaching and refining agent in this embodiment has the following component mass ratios: 4 parts fatty alcohol polyoxyethylene ether, 4 parts isomeric alcohol polyoxyethylene ether, 2 parts alkyl glycoside, 3 parts alkylamine ester, 14 parts sodium polyacrylate, and 72 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0%.

[0052] Example 5

[0053] The difference between this embodiment and Embodiment 1 is that the low-temperature debleaching and refining agent in this embodiment has the following component mass ratios: 6 parts fatty alcohol polyoxyethylene ether, 6 parts isomeric alcohol polyoxyethylene ether, 3 parts alkyl glycoside, 5 parts alkylamine ester, 10 parts sodium polyacrylate, and 69 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0%.

[0054] Example 6

[0055] The difference between this embodiment and Embodiment 1 is that the low-temperature debleaching and refining agent in this embodiment has the following component mass ratios: 5 parts fatty alcohol polyoxyethylene ether, 6 parts isomeric alcohol polyoxyethylene ether, 2 parts alkyl glycoside, 4 parts alkylamine ester, 12 parts sodium polyacrylate, and 69.8 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0%.

[0056] Example 7

[0057] The difference between this embodiment and Embodiment 6 is that the final concentration of sodium hydroxide added is 1.1%.

[0058] Example 8

[0059] The difference between this embodiment and Embodiment 6 is that the final concentration of sodium hydroxide added is 1.2%.

[0060] Example 9

[0061] The difference between this embodiment and Embodiment 6 is that the final concentration of sodium hydroxide added is 1.3%.

[0062] Example 10

[0063] The difference between this embodiment and Embodiment 6 is that the final concentration of sodium hydroxide added is 1.5%.

[0064] Example 11

[0065] The difference between this embodiment and embodiment 8 is that the low-temperature debleaching and refining agent in this embodiment also includes 0.05 parts of polysiloxane defoamer.

[0066] Example 12

[0067] The difference between this embodiment and embodiment 8 is that the low-temperature debleaching and refining agent in this embodiment also includes 0.05 parts of modified polysiloxane defoamer.

[0068] Comparative Example 1

[0069] This application uses existing sodium benzenesulfonate refining agents as Comparative Example 1.

[0070] The refining agent of this comparative example comprises the following components in the following mass proportions: sodium dodecylbenzenesulfonate 3.6 parts, aminotriacetic acid 4.4 parts, acetylguanidine 5 parts, and deionized water 7 parts. All components are thoroughly mixed, and then defoamed to obtain the refining agent of this comparative example.

[0071] Comparative Example 2

[0072] This application uses existing polyoxyethylene ether refining agents as Comparative Example 2.

[0073] The refining agent of this comparative example comprises the following components in the following mass proportions: 5 parts fatty alcohol polyoxyethylene ether, 6 parts sodium SAS60 secondary alkyl sulfonate, 6 parts isomeric alcohol polyoxyethylene ether, 1.2 parts sodium hydroxide, 0.05 parts polysiloxane defoamer, and 81.75 parts deionized water. All components are thoroughly mixed, and then defoamed to obtain the refining agent of this comparative example.

[0074] Comparative Example 3

[0075] The difference between this comparative example and Example 11 is that an equal amount of alkyl glycoside is used instead of alkylamine ester.

[0076] Comparative Example 4

[0077] The difference between this comparative example and Example 11 is that no alkyl glycosides were added.

[0078] Comparative Example 5

[0079] The difference between this comparative example and Example 11 is that an equal amount of alkylamine ester is used instead of alkyl glycoside.

[0080] Comparative Example 6

[0081] The difference between this comparative example and Example 11 is that sodium polyacrylate was not added.

[0082] Performance testing

[0083] The refining agents prepared in Examples 1-12 and Comparative Examples 1-6 of this application were subjected to performance tests on foaming power, alkali penetration resistance and alkali resistance.

[0084] Detection method:

[0085] The foaming power was tested using the ROSS-MILES method as described in the national standard GB / T 7462-1994, which measured the height of the foam after 5 minutes of foaming at room temperature.

[0086] For alkali resistance permeability testing, the standard canvas sedimentation method was used. A 35mm unrefined circular canvas was selected as the sample. The concentration of the refining agent in the solution was 5g / L, and the base solution was a 15g / L sodium hydroxide solution.

[0087] Alkali resistance testing was conducted using a simulated limit concentration debleaching alkali solution test method. This involved preparing a 150 g / L sodium hydroxide solution, adding refining agent at a dosage of 25 g / L, and observing whether phenomena such as turbidity, flocculation, or oil separation occurred.

[0088] The test results are shown in Table 1 below.

[0089] Table 1 Performance test results of Examples 1-12 and Comparative Examples 1-6

[0090]

[0091] As can be seen from the data in Table 1, the refining agents of Examples 1-12 of this application have significantly better alkali penetration resistance than the refining agents of Comparative Examples 1-6; the refining agents of Examples 1-12 of this application have significantly better alkali resistance than the refining agents of Comparative Examples 1-2 of the prior art; the refining agents of Examples 1-12 of this application have relatively excellent low-foaming effect, and after adding defoamer, the low-foaming effect is extremely excellent.

[0092] By comparing the data of Examples 1-12 of this application and the data of Comparative Examples 3-6 in Table 1, it can be seen that there is a synergistic effect between alkyl glycosides, alkylamine esters and sodium polyacrylate. The synergistic effect of the three can significantly enhance the alkali permeability resistance of the system. The absence of any one of the components will lead to a significant decrease in the alkali permeability resistance of the system. In addition, the optimization of the ratio of alkyl glycosides, alkylamine esters and sodium polyacrylate can further improve the alkali permeability resistance of the system.

[0093] Efficacy testing

[0094] The refining agents of Examples 1-12 and Comparative Examples 1-6 of this application were tested for their effectiveness in the hydrogen peroxide low-temperature activation debleaching process for cotton fabrics. The whiteness, wicking effect, and tear strength reduction rate of the fabrics before and after debleaching were tested.

[0095] This test uses the following low-temperature debleaching process:

[0096] Pure cotton fabric was selected as the bleaching sample. The length (warp) of a single piece of fabric was 30cm, the width (weft) was 5cm, and the areal density was 50g / m². 2 ;

[0097] The debleaching solution is prepared with sodium hydroxide, hydrogen peroxide and refining agent, with sodium hydroxide concentration of 20g / L, hydrogen peroxide concentration of 6g / L and refining agent concentration of 5g / L.

[0098] The debleaching process involves bleaching at 40℃ for 120 minutes, followed by two washes with room temperature water and a final drying process, with a liquor ratio of 1:50.

[0099] Whiteness testing was conducted using the standard specified in GB / T 17644—2008 "Instrumental Evaluation Method for Whiteness of Textiles", and a WSD-3A intelligent digital whiteness meter was used to test the whiteness.

[0100] The following method was used for capillary effect testing: A parallel line was drawn with a pencil along the weft direction 1 cm away from one end of the bleached cotton sample. A short glass rod weighing about 2g was fixed along the weft direction at this end as a load. The other end of the sample was fixed to a horizontal frame with a clip to suspend it vertically. The lower end was immersed in a 5g / L potassium dichromate solution, so that the liquid level was exactly aligned with the pencil line. The height of the potassium dichromate solution rising along the weft direction within 30 minutes was measured and expressed in cm.

[0101] Tear strength testing was conducted using a 026D-250 electronic fabric strength tester. The samples were cut into rectangles of 70mm × 63mm, and the tear strength of each sample was tested on two warp and two weft sections. The average value was taken, and then the tear strength reduction rate was calculated.

[0102] The results are shown in Table 2 below.

[0103] Table 2. Efficacy test results of Examples 1-12 and Comparative Examples 1-6

[0104]

[0105] As can be seen from the data in Table 2, the refining agents of Examples 1-12 of this application are superior to the refining agents of Comparative Examples 1-6 in terms of debleaching efficiency, whiteness, wicking effect, and tear strength reduction rate. This fully demonstrates that the refining agents of this application have excellent debleaching and impurity removal effects, cause less damage to fabrics, and have superior performance.

[0106] The data in Table 2, comparing the data from Examples 1 to 12, shows that the refining agent of this application exhibits the best efficacy after optimizing the formulation and using a sodium hydroxide concentration of 1.2%.

[0107] The data in Table 2, comparing the data of Example 11 and Comparative Examples 3-6, shows that the refining agent of this application, using a specific surfactant and synergistically formulated with alkyl glycosides, alkylamine esters, and sodium polyacrylate, not only achieves the best refining effect but also significantly improves the impurity removal effect, giving the fabric excellent wicking effect and whiteness. The data comparison also shows that the synergistic formulation of alkyl glycosides, alkylamine esters, and sodium polyacrylate in this application, with a specific ratio, is significantly more effective than that of Comparative Examples 3-6, which fully demonstrates the synergistic impurity removal effect of the formulation.

[0108] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-temperature debleaching and refining agent, characterized in that, The refining agent comprises the following components in the following mass proportions: 4-8 parts of fatty alcohol polyoxyethylene ether, 2-10 parts of isomeric alcohol polyoxyethylene ether, 1-4 parts of alkyl glycoside, 2-8 parts of alkylamine ester, 10-16 parts of sodium polyacrylate, and 62-74 parts of deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.0-1.5%.

2. The low-temperature debleaching and refining agent according to claim 1, characterized in that, The refining agent comprises the following components in the following mass proportions: 4-6 parts of fatty alcohol polyoxyethylene ether, 4-6 parts of isomeric alcohol polyoxyethylene ether, 2-3 parts of alkyl glycoside, 3-5 parts of alkylamine ester, 10-12 parts of sodium polyacrylate, and 68-70 parts of deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.1-1.3%.

3. The low-temperature debleaching and refining agent according to claim 2, characterized in that, The refining agent comprises the following components in the following mass proportions: 5 parts fatty alcohol polyoxyethylene ether, 6 parts isomeric alcohol polyoxyethylene ether, 2 parts alkyl glycoside, 4 parts alkylamine ester, 12 parts sodium polyacrylate, and 69.5-70 parts deionized water; the refining agent also includes sodium hydroxide, and the final concentration of sodium hydroxide added is 1.2%.

4. The low-temperature debleaching and refining agent according to claim 1, characterized in that, The sodium polyacrylate is selected from products with a molecular weight of 2400-5000.

5. The low-temperature debleaching and refining agent according to claim 1, characterized in that, The refining agent also includes an antifoaming agent, and the amount of the antifoaming agent added is 0.04 to 0.08 parts.

6. The low-temperature debleaching and refining agent according to claim 5, characterized in that, The defoamer is selected from polysiloxane or modified polysiloxane defoamers.

7. A method for preparing the low-temperature debleaching and refining agent according to claim 1, characterized in that, Includes the following steps: S1. Weigh each component precisely according to the formula amount; S2. Add the alkyl glycoside and alkyl amino ester weighed in step S1 to deionized water, stir and mix for more than 3 minutes, add the amount of sodium hydroxide in the formula, and continue to stir and mix for more than 5 minutes to obtain a mixture. S3. Under stirring conditions, add the formulated amounts of fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether to the mixture obtained in step S2 in sequence, and continue stirring and mixing for more than 8 minutes to obtain a secondary mixture. S4. Add the prescribed amount of sodium polyacrylate to the secondary mixture obtained in step S3, stir and mix for more than 30 minutes to obtain a refined mixture. S5. Defoaming treatment is performed on the refining mixture obtained in step S4 to obtain a low-temperature debleaching refining agent.

8. The method for preparing the low-temperature debleaching and refining agent according to claim 7, characterized in that, In steps S2 and S3, the stirring speed is controlled at 40~80 rpm.

9. The method for preparing the low-temperature debleaching and refining agent according to claim 7, characterized in that, In step S4, the stirring speed is controlled at 120~200 rpm.

10. The method for preparing the low-temperature debleaching and refining agent according to claim 7, characterized in that, In step S4, the defoaming treatment is carried out by adding a defoaming agent and allowing it to stand to defoam.

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