Continuous low-temperature scouring agent as well as preparation method and application thereof

Abstract

The invention discloses a continuous low-temperature scouring agent as well as a preparation method and application thereof. The scouring agent comprises the following components in percentage by weight on the basis of the total weight: 10 to 16 percent of amine oxide surfactant, 8 to 18 percent of fatty alcohol EOPO block polyether, 4 to 8 percent of wax melting agent, 5 to 12 percent of gemini organosilicon surfactant, 18 to 24 percent of cationic polyacrylamide and 22 to 55 percent of water. The continuous low-temperature scouring agent prepared by the invention does not contain phosphorus, has good low-temperature wax removal emulsibility, good spreadability and strong dispersion washing power, and is particularly suitable for continuous low-temperature process treatment of cotton-polyester blended or pure cotton woven fabrics, and the treated fabrics are uniform in cloth cover, good in batch stability and high in desizing grade. The anti-pilling agent is used for polyester cotton tooling fabrics, and endows the fabrics with good anti-pilling performance.

Description

Technical Field

[0001] The invention relates to the technical field of textile printing and dyeing, and in particular to a low-temperature scouring agent used in a continuous process for polyester-cotton / pure cotton woven fabrics, and a preparation method and application thereof. Background Art

[0002] There are two common pre-treatment processes for polyester-cotton or pure cotton fabrics: intermittent and continuous. The intermittent process is mainly used to process knitted fabrics, while the continuous process is mainly used to process woven fabrics. Currently, most continuous pre-treatment processes still use high-temperature steaming at 100-102°C. This processing method consumes a lot of steam. Today, when energy conservation and emission reduction are advocated, low-temperature processes are receiving more and more attention.

[0003] At present, for polyester-cotton blended fabrics, the temperature has been reduced from 100℃ steaming to 80℃, and the entire processing process saves about 20-30% steam. The 80℃ process has excellent processing effect on polyester-cotton blended fabrics with a polyester content of more than 65%. For CVC fabrics (cotton content is greater than polyester), or even pure cotton fabrics, because there are many impurities such as cottonseed shells and cotton wax on the cotton blanks and they are difficult to remove at low temperatures, the process is generally carried out by 100-102℃ alkali boiling + oxygen bleaching. This process requires a high amount of steam, so many printing and dyeing factories now switch to room temperature cold stacking + 100℃ steaming. In order to further reduce the amount of steam used, some printing and dyeing factories use room temperature cold stacking + 80℃ oxygen bleaching. The equipment used to switch from the original steaming to the cold stacking process is different, and a large amount of funds needs to be invested in equipment replacement. In addition, the time required for the cold stacking process is basically 20-24 hours, which is a long time and inefficient. For factories with large production volumes, a large amount of space is required to store fabrics in the cold stacking, which has certain requirements on the scale of the printing and dyeing factory. For pure cotton fabrics, it is of great significance for printing and dyeing factories to reduce production temperature, shorten production time and improve production efficiency. Because temperature has a decisive influence on the function of alkali and hydrogen peroxide, the lower the temperature, the higher the amount of chemicals used. When switching from 100℃ to 80℃ oxygen bleaching, a large amount of scouring agent is required. When combined with phosphorus-containing chelating agents such as HEDP, a higher whiteness can be achieved at 80℃ oxygen bleaching, which leads to higher electrolyte and COD values ​​in wastewater, phosphorus-containing water pollution, and increased chemical costs and sewage treatment costs. At present, the low-temperature pretreatment of the continuous process can only reach 80℃, and there is no phosphorus-free scouring agent for the continuous process at a low temperature of 60℃. It does not require additional chemical dosage and is suitable for both polyester-cotton fabrics and pure cotton fabrics in short processes.

[0004] Traditional scouring agents are mostly anionic and nonionic compound systems. The present invention adopts a nonionic and cationic compound system, which not only has the emulsification, penetration, washing and dispersing effects of traditional scouring agents, but also has good adsorption properties, and can fully adsorb anionic slurries, impurities, etc. to separate and remove them from the fibers. The cationic surfactant of the present invention has high hydrophilicity and strong conductivity. It acts on polyester-cotton fabrics to obtain excellent whiteness and hair effect. The product of the present invention can improve the anti-pilling performance of the fabric. After the treatment, the fabric does not need to be subjected to additional anti-pilling finishing, which shortens the process flow and saves production costs. Summary of the invention

[0005] The present invention provides a continuous low-temperature scouring agent for the deficiencies in the prior art. The scouring agent has good emulsification wettability and can remove impurities by low-temperature melting and emulsification. It uses a cationic auxiliary agent, cooperates with caustic soda and hydrogen peroxide, can adsorb impurities from the fiber and disperse them in the working liquid, removes impurities more thoroughly, does not contain phosphorus, and does not cause eutrophication of the water body. It can be used for low-temperature 60°C treatment of polyester-cotton blended or pure cotton continuous process, shortens the process time, improves production efficiency, and saves energy consumption. When used for polyester-cotton blended fabrics, excellent treatment effects can be obtained, and the fabrics after treatment are not easy to pilling during subsequent use. When used for pure cotton fabrics, excellent treatment effects can be obtained without increasing the amount of chemicals, the fabric surface is uniform, the batch is stable, and the wastewater treatment pressure is small.

[0006] One aspect of the present invention provides a continuous low-temperature scouring agent, which comprises the following components based on total weight:

[0007] Amine oxide surfactant: 10-16wt%,

[0008] Fatty alcohol EOPO block polyether: 8-18wt%,

[0009] Wax melting agent: 4-8wt%,

[0010] Gemini silicone surfactant: 5-12wt%,

[0011] Cationic polyacrylamide: 18-24wt%, and

[0012] Water: 22-55wt%.

[0013] Another aspect of the present invention provides a method for preparing a continuous low-temperature scouring agent, which comprises the following steps:

[0014] (1) Add 20-40% of the total water consumption of water and wax melt into the reaction kettle, stir at 50-60° C. for 10-15 minutes until the mixture is uniform;

[0015] (2) adding amine oxide surfactant, fatty alcohol EOPO block polyether, gemini silicone surfactant, cationic polyacrylamide and the remaining amount of water to the mixture formed in step (1) and continuing stirring for 20-30 minutes;

[0016] (3) cooling to room temperature to obtain the continuous low-temperature scouring agent.

[0017] Another aspect of the present invention provides the use of the continuous low-temperature scouring agent in the continuous process low-temperature 60° C. pre-treatment of polyester-cotton or pure cotton woven fabrics.

[0018] Compared with the prior art, the continuous low-temperature scouring agent of the present invention has high emulsifying power, and can remove impurities such as oil on polyester fiber and slurry, grease, wax, etc. on cotton fiber by emulsification at low temperature; Gemini silicone surfactant has strong adsorption, low surface tension and good spreading property; cationic polyacrylamide, a high molecular weight substance, has high dispersing power, and can remove impurities from the fiber and fully disperse them in the working fluid for removal. It is combined with amine oxide surfactant to improve the smoothness and hydrophilicity of the fabric, and can effectively improve the pilling performance of the fabric, eliminate the need for post-pill anti-pilling finishing, shorten the processing flow, and improve production efficiency. It does not contain phosphorus and is environmentally friendly. It is used for low-temperature 60°C pre-treatment of polyester-cotton fabrics, and the fabric surface is uniform after treatment, and the anti-pilling effect is good. It is used for low-temperature 60°C pre-treatment of pure cotton fabrics, shortening the processing time, and the desizing effect of the fabric after treatment is good, and the whiteness and wool effect can meet the requirements of subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a photograph showing the pilling performance of fabric after pre-treatment. DETAILED DESCRIPTION

[0020] In a preferred embodiment, the continuous low-temperature scouring agent of the present invention comprises, based on the total weight:

[0021] Amine oxide surfactant: 10-16wt%,

[0022] Fatty alcohol EOPO block polyether: 8-18wt%,

[0023] Wax melting agent: 4-8wt%,

[0024] Gemini silicone surfactant: 5-12wt%,

[0025] Cationic polyacrylamide: 18-24wt%, and

[0026] Water: 22-55wt%.

[0027] In a preferred embodiment, the wax melting agent is carboxyethyl thiosuccinic acid.

[0028] In a preferred embodiment, the structural formula of the amine oxide surfactant is as follows:

[0029]

[0030] Among them, R 1 is a C12-C16 saturated alkyl group, R 2 -CH 3 or -CH 2 CH 2 OH, R 3 It is lauric acid, oleic acid or myristic acid.

[0031] In a preferred embodiment, the EO number of the fatty alcohol EOPO block polyether is 9-10, and the PO number is 1-2.

[0032] In a preferred embodiment, the structure of the gemini silicone surfactant is as follows:

[0033]

[0034] Among them, R 4 is a C8-C14 saturated alkyl group, m is an integer of 5-10, and n is an integer of 5-12.

[0035] In a preferred embodiment, the structural formula of the cationic polyacrylamide is as follows:

[0036]

[0037] Among them, R 5 is methyl, ethyl or benzyl, R 6 It is H or methyl, and a:b=5-8:1.

[0038] In a preferred embodiment, the weight average molecular weight of the cationic polyacrylamide is 8000-20000.

[0039] In a preferred embodiment, the preparation method of the cationic polyacrylamide is as follows:

[0040] (1) Place acrylamide, (meth)acryloyloxyammonium chloride, ammonium sulfate, deionized water, and sodium hypophosphite in a four-necked flask, stir with nitrogen, and add an initiator to carry out polymerization.

[0041] (2) The product of step (1) is fully dissolved in deionized water, and then acetone is added to precipitate the polymer; the precipitation is repeated with deionized water and acetone to remove inorganic salts and unreacted monomers, and then the product is dried.

[0042] In a preferred embodiment, the preparation method of the cationic polyacrylamide is as follows:

[0043] (1) About 0.5 mol of acrylamide, about 0.07-0.10 mol of (meth)acryloyloxyammonium chloride, 75-78 g of ammonium sulfate, deionized water, and 3 g of sodium hypophosphite (245 g in total) were placed in a 500 mL four-necked flask, and stirred with nitrogen. When the solution became clear, it was heated to 60-70° C. After 30 minutes, 2.4 g of 0.5% ammonium persulfate aqueous solution as initiator was added. After 4 hours when the system turned grayish white, 2.6 g of 0.5% ammonium persulfate aqueous solution as initiator was added. The reaction was continued for 6 hours and then stopped.

[0044] (2) Take the product in (1) and add 200g of deionized water to fully dissolve it, then add acetone to precipitate the polymer; repeat the precipitation with deionized water and acetone for 3 times to remove inorganic salts and unreacted monomers. The washed sample is placed in a vacuum oven at 45°C and dried to constant weight to obtain the product cationic polyacrylamide.

[0045] In a preferred embodiment, the preparation method of a continuous low-temperature scouring agent of the present invention comprises the following steps:

[0046] (1) Add 30-50% of the total water consumption of water and wax melt into the reaction kettle, stir at 50-60° C. for 10-15 minutes until the mixture is uniform;

[0047] (2) adding amine oxide surfactant, fatty alcohol EOPO block polyether, gemini silicone surfactant, cationic polyacrylamide and the remaining amount of water to the mixture formed in step (1) and continuing stirring for 20-30 minutes;

[0048] (3) cooling to room temperature to obtain the continuous low-temperature scouring agent.

[0049] The continuous low-temperature scouring agent prepared by the invention has good low-temperature wetting and emulsifying power, does not contain phosphorus, has strong adsorption, and has good dispersing and washing power. It is applied to the low-temperature 60°C pre-treatment of the continuous process, can shorten the process flow, reduce processing energy consumption, save costs, and has uniform surface of the textiles after treatment, good batch stability, and can be used for the treatment of polyester-cotton blended fabrics to obtain certain anti-pilling performance.

[0050] Example

[0051] 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.

[0052] The application performance of the continuous low-temperature scouring agent of the present invention is verified by the following experiments.

[0053] 1 Experimental content

[0054] 1.1 Textiles: T / C 90 / 10 (polyester cotton poplin grey fabric) / cotton poplin grey fabric 133×72

[0055] 1.2 Chemicals: NaOH, H 2 O 2 (100%), scouring enzymes are all from commercial products, commercial product T (solid content 60.2%), commercial product Y (solid content 83.5%), commercial traditional scouring agent P (solid content 51.2%), scouring agent of the present invention

[0056] 1.3 Application process:

[0057] 1.3.1 Pretreatment of polyester-cotton fabrics

[0058] Formula: NaOH 25g / L, H 2 O 2 (100%) 15g / L, scouring agent 5g / L

[0059] The low-temperature process of the present invention comprises: pre-dipping and rolling treatment working solution (two dipping and two rolling, rolling rate 100%) → stacking at 60°C for 50 minutes → four-grid hot water washing (95°C×30s, 95°C×30s, 80°C×30s, 80°C×30s) → washing, dehydration and drying.

[0060] Traditional process: dipping and padding pre-treatment working solution (two dipping and two padding, padding rate 100%) → 100℃ steaming for 50 minutes → four-grid hot water washing (95℃×30s, 95℃×30s, 80℃×30s, 80℃×30s) → water washing, dehydration, and drying.

[0061] 1.3.2 Pretreatment of pure cotton fabric

[0062] formula:

[0063] Desizing: NaOH 50g / L, scouring agent 10g / L

[0064] Oxygen bleaching: NaOH 5g / L, H 2 O 2 (100%) 9g / L, scouring enzyme 6g / L, scouring agent 4g / L

[0065] The low-temperature process of the present invention comprises the following steps: padding in desizing working solution (two dips and two pads, the padding rate is 100%) → stacking at 60°C for 60 minutes → four-grid hot water washing (95°C×30s, 95°C×30s, 90°C×30s, 80°C×30s) → padding → padding in oxygen bleaching solution (two dips and two pads, the padding rate is 100%) → stacking at 60°C for 40 minutes → four-grid hot water washing (95°C×30s, 95°C×30s, 80°C×30s, 80°C×30s) → washing, dehydration and drying.

[0066] Traditional process: dipping and padding in desizing working solution (two dipping and two padding, padding rate 100%) → steaming at 100℃ for 60 minutes → four-grid hot water washing (95℃×30s, 95℃×30s, 90℃×30s, 80℃×30s) → rolling and drying → dipping and padding in oxygen bleaching solution (two dipping and two padding, padding rate 100%) → steaming at 100℃ for 40 minutes → four-grid hot water washing (95℃×30s, 95℃×30s, 80℃×30s, 80℃×30s) → washing, dehydration and drying.

[0067] 2 Performance Testing

[0068] 2.1 Determination of total phosphorus content in scouring agent

[0069] The total phosphorus content in the scouring agent is determined according to GB / T 11893-1989 "Determination of total phosphorus in water quality - Ammonium molybdate spectrophotometry". The lower the test value, the less pollution the scouring agent causes to the water body.

[0070] 2.2 Fabric whiteness, hair effect, and strength test

[0071] The treated textiles were folded into four layers and tested for CIE whiteness using Datacolor 650. The higher the value, the better the whiteness.

[0072] The treated textiles are tested for capillary effect according to FZ / T01071-2008 method. The higher the value, the better the capillary effect.

[0073] The fabric strength is measured according to GB / T3917.1-2009 “Tear properties of textile fabrics Part 2: Determination of tear strength of trouser-shaped test specimens (single seam)”. The larger the test value, the less damage the pre-treatment has on the fabric strength.

[0074] 2.3 Fabric desizing grade test

[0075] Color developing iodine solution: weigh 10.0g of potassium iodide into a 150ml beaker, add 100ml of distilled water to dissolve, add 0.635g of iodine and dissolve it in the potassium iodide solution, then pour into a 1000ml measuring cylinder, add water to 800ml, then add ethanol to 1000ml, stir well and set aside.

[0076] Cut the treated fabric into 4cm×4cm squares, immerse in the color-developing iodine solution for 1 minute, take it out, wash off the excess iodine solution with distilled water, take it out, absorb the excess water with filter paper or towel without starch slurry, and compare and rate it with the TEGEWA VoiletScale standard color card.

[0077] 2.4 Fabric pilling performance test

[0078] The pilling properties of fabrics are measured according to GB / T4808.2-2008 "Determination of the pilling properties of textile fabrics Part 2: Modified Martindale method". The greater the change in the fabric surface, the lower the rating, which means the fabric is more prone to pilling.

[0079] Preparation Example 1-Cationic Polyacrylamide 1:

[0080] (1) 35.5 g (about 0.5 mol) of acrylamide, 26.9 g (about 0.1 mol) of acryloyloxyethyl dimethylbenzyl ammonium chloride, 78 g of ammonium sulfate, 101.6 g of deionized water, and 3 g of sodium hypophosphite were placed in a 500 mL four-necked flask, and stirred under nitrogen. When the solution became clear, it was heated to 60° C. After 30 minutes, 2.4 g of 0.5% ammonium persulfate aqueous solution as initiator was added. After 4 hours after the system turned grayish white, 2.6 g of 0.5% ammonium persulfate aqueous solution as initiator was added, and the reaction was continued for 6 hours before stopping.

[0081] (2) Take the product in (1) and add 200g of deionized water to fully dissolve it, then add acetone to precipitate the polymer; repeat the precipitation with deionized water and acetone for 3 times to remove inorganic salts and unreacted monomers. The washed sample is placed in a vacuum oven at 45°C and dried to constant weight to obtain the product cationic polyacrylamide 1 (the measured weight average molecular weight is about 12000).

[0082] Preparation Example 2-Cationic Polyacrylamide 2:

[0083] (1) 35.5 g of acrylamide, 13.6 g (about 0.07 mol) of acryloyloxyethyl trimethyl ammonium chloride, 75 g of ammonium sulfate, 117.9 g of deionized water, and 3 g of sodium hypophosphite were placed in a 500 mL four-necked flask and stirred with nitrogen. When the solution became clear and transparent, it was heated to 65° C. After 30 minutes, 2.4 g of 0.5% ammonium persulfate aqueous solution as initiator was added. After 4 hours when the system turned grayish white, 2.6 g of 0.5% ammonium persulfate aqueous solution as initiator was added. The reaction was continued for 6 hours and then stopped.

[0084] (2) Take the product in (1) and add 200g of deionized water to fully dissolve it, then add acetone to precipitate the polymer; repeat the precipitation with deionized water and acetone for 3 times to remove inorganic salts and unreacted monomers. The washed sample is placed in a vacuum oven at 45°C and dried to constant weight to obtain the product cationic polyacrylamide 2 (the measured weight average molecular weight is about 18000).

[0085] Preparation Example 3-Cationic Polyacrylamide 3:

[0086] (1) 35.5 g of acrylamide, 18.7 g (about 0.09 mol) of methacryloyloxyethyl trimethylammonium chloride, 77 g of ammonium sulfate, 110.8 g of deionized water, and 3 g of sodium hypophosphite were placed in a 500 mL four-necked flask, stirred under nitrogen, and heated to 70° C. when the solution became clear and transparent. After 30 minutes, 2.4 g of 0.5% ammonium persulfate aqueous solution as initiator was added. After 4 hours when the system turned grayish white, 2.6 g of 0.5% ammonium persulfate aqueous solution as initiator was added. The reaction was continued for 6 hours and then stopped.

[0087] (2) Take the product in (1) and add 200g of deionized water to fully dissolve it, then add acetone to precipitate the polymer; repeat the precipitation with deionized water and acetone for 3 times to remove inorganic salts and unreacted monomers. The washed sample is placed in a vacuum oven at 45°C and dried to constant weight to obtain the product cationic polyacrylamide 3 (the measured weight average molecular weight is about 8000).

[0088] Example 1

[0089] 16 g of water and 6 g of carboxyethyl thiosuccinic acid (purchased from Jiangsu Pules Biotechnology) were added to a 150 mL beaker, heated to 55 ° C in a water bath, and stirred for 10 minutes until the solution was uniform. 12 g of lauramide propyl amine oxide LAO-30 (purchased from Jinan Baoliyuan), 16 g of fatty alcohol block polyether AEO102 (purchased from Wanhua Chemical, EO=10, PO=2), 8 g of Gemini silicone surfactant (purchased from Shaanxi University of Science and Technology, R 4 C12 alkyl, m=7, n=5), 18g cationic polyacrylamide 1 (weight average molecular weight of about 12000) and 24g water, continue stirring for 20 minutes to make the solution uniform, cool to room temperature, and obtain low-temperature scouring agent 1 (light yellow transparent liquid, solid content 49.2%).

[0090] Example 2

[0091] 17g of water and 8g of carboxyethyl thiosuccinic acid (purchased from Jiangsu Pules Biotechnology) were added to a 150mL beaker, heated to 60°C in a water bath, stirred for 15 minutes until the solution was uniform, and then 16g of oleic acid amide propyl amine oxide OAO-30 (purchased from Jingzhou Yinjie Chemical), 14g of fatty alcohol block polyether SA90 (purchased from Sasol, EO=9, PO=1), 6g of Gemini silicone surfactant (purchased from Shaanxi University of Science and Technology, R 4 C8 alkyl, m=9, n=7), 22g cationic polyacrylamide 2 (weight average molecular weight of about 18000) and 17g water, continue stirring for 30 minutes to make the solution uniform, cool to room temperature, and obtain low-temperature scouring agent 2 (yellow transparent viscous liquid, solid content 51.6%).

[0092] Example 3

[0093] 12g water and 4g carboxyethyl thiosuccinic acid (purchased from Jiangsu Pules Biotechnology) were added to a 150mL beaker, heated to 50°C in a water bath, stirred for 10 minutes until the solution was uniform, and then 10g tetradecyl dihydroxyethyl amine oxide (purchased from Henan Daochun Chemical), 18g fatty alcohol block polyether AE-96 (purchased from Zhejiang Kaide Chemical, EO=10, PO=1), 9g Gemini silicone surfactant (purchased from Shaanxi University of Science and Technology, R 4 C10 alkyl, m=5, n=9), 24g cationic polyacrylamide 3 (weight average molecular weight about 8000) and 23g water, continue stirring for 30 minutes to make the solution uniform, cool to room temperature, and obtain low-temperature scouring agent 3 (yellow transparent liquid, solid content 52.4%).

[0094] Table 1 Comparison of total phosphorus content of scouring agents

[0095]

[0096]

[0097] Note: The detection limit of total phosphorus content is 0.002 mg / L

[0098] As can be seen from the data in Table 1, the scouring agent of the present invention is phosphorus-free and will not cause eutrophication of water bodies, which is more beneficial to environmental sustainable development. Some regions have restrictions on the phosphorus content in discharged wastewater, so the use of the scouring agent of the present invention is not subject to regional restrictions.

[0099] Table 2 Comparison of low temperature pretreatment effects of scouring agents

[0100]

[0101] As shown in Table 2, for textiles of different specifications treated with the same continuous pre-treatment process, the whiteness, hair effect and desizing effect of the scouring agent of the present invention are significantly better than those of the commercial products T and Y, and slightly better than the traditional process, indicating that the scouring agent of the present invention has excellent emulsification, washing and dispersing properties, and the low-temperature treatment effect can fully meet the processing requirements. The tear strength of the treated fabric is better than that of the commercial products T, Y and the traditional process, indicating that the scouring agent of the present invention has less damage to the strength.

[0102] Table 3 Pilling properties of fabrics after pretreatment

[0103] Scouring agent name Rating Commercially available traditional scouring agent P 2-3 Commercially available product T 3 Commercially available product Y 3 Example 1 4 Example 2 4 Example 3 4

[0104] Figure 1 Table 3 is the pilling performance photo of the fabric after pretreatment, and Table 3 is the corresponding rating. Figure 1 As can be seen from the data in Table 3, the scouring agent of the present invention acts on polyester-cotton blended fabrics, and the anti-pilling property after treatment is improved compared with the commercial scouring agent P of the traditional process and the commercial scouring agents T and Y of the low-temperature process, so that the textiles are not easy to pilling during subsequent wearing and use, and are beautiful and generous, and the service life of the clothing is extended.

[0105] It can be seen that the scouring agent of the present invention has excellent emulsifying, dispersing, washing and environmental protection properties. When applied to the continuous pretreatment low-temperature 60°C process of polyester-cotton / pure cotton woven fabrics, the desizing grade, whiteness, hair effect and strength of the processed textiles are higher than similar products on the market and meet the requirements of subsequent dyeing, and has excellent market prospects.

[0106] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the protection scope of the present invention. Any changes and modifications made by any technician familiar with the technology without departing from the concept and scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A continuous low-temperature scouring agent, comprising the following components based on total weight: Amine oxide surfactant: 10-16wt%, Fatty alcohol EOPO block polyether: 8-18wt%, Wax melting agent: 4-8wt%, Gemini silicone surfactant: 5-12wt%, Cationic polyacrylamide: 18-24wt%, and Water: 22-55wt%.

2. The continuous low-temperature scouring agent according to claim 1, characterized in that: The wax melting agent is carboxyethyl thiosuccinic acid.

3. The continuous low-temperature scouring agent according to claim 1, characterized in that: The structural formula of the amine oxide surfactant is as follows: Among them, R1 is a saturated alkyl group of C12-C16, R2 is -CH3 or -CH2CH2OH, and R3 is lauric acid, oleic acid or myristic acid.

4. The continuous low-temperature scouring agent according to claim 1, characterized in that: The EO number of the fatty alcohol EOPO block polyether is 9-10, and the PO number is 1-2.

5. The continuous low-temperature scouring agent according to claim 1, characterized in that: The structural formula of the Gemini silicone surfactant is as follows: Wherein, R4 is a saturated alkyl group of C8-C14, m is an integer of 5-10, and n is an integer of 5-12.

6. The continuous low-temperature scouring agent according to claim 1, characterized in that: The structural formula of the cationic polyacrylamide is as follows: Wherein, R5 is methyl, ethyl or benzyl, R6 is H or methyl, and a:b=5-8:

1.

7. The continuous low-temperature scouring agent according to claim 6, characterized in that: The weight average molecular weight of the cationic polyacrylamide is 8000-20000.

8. The continuous low-temperature scouring agent according to claim 6, characterized in that: The preparation method of the cationic polyacrylamide is as follows: (1) acrylamide, (meth)acryloyl ammonium chloride, ammonium sulfate, deionized water, and sodium hypophosphite are placed in a four-necked flask, stirred with nitrogen, and an initiator is added to carry out polymerization; (2) The product of step (1) is fully dissolved in deionized water, and then acetone is added to precipitate the polymer; the precipitation is repeated with deionized water and acetone to remove inorganic salts and unreacted monomers, and then the product is dried.

9. The method for preparing a continuous low-temperature scouring agent according to any one of claims 1 to 8, characterized in that: The steps include: (1) Add 30-50% of the total water consumption of water and wax melt into the reaction kettle, stir at 50-60° C. for 10-15 minutes until the mixture is uniform; (2) adding amine oxide surfactant, fatty alcohol EOPO block polyether, gemini silicone surfactant, cationic polyacrylamide and the remaining amount of water to the mixture formed in step (1) and continuing stirring for 20-30 minutes; (3) cooling to room temperature to obtain the continuous low-temperature scouring agent.

10. Use of the continuous low-temperature scouring agent according to any one of claims 1 to 8 in a continuous process low-temperature 60°C pretreatment process for polyester-cotton or pure cotton woven fabrics.

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