A method for removing APEO from down

Abstract

The application provides a down APEO removal method, which comprises the following steps: placing down to be treated in a washing machine, adding water and a down APEO removal agent, cleaning and centrifugal drying. The down APEO removal agent comprises the following components in mass fraction: lauryl alcohol polyoxyethylene ether 30-40 parts, abietic acid polyoxyethylene ester 12-18 parts, isomeric tridecanol polyoxyethylene ether 8-14 parts, dodecyl glucosamide 1.6-2.4 parts, isopropyl alcohol 2-7 parts, polyvinyl pyrrolidone 0.15-0.25 parts, hydroxymethyl cellulose 0.03-0.11 parts, magnesium chloride 22-32 parts, cyclodextrin 3.0-5.5 parts, and deionized water 80-112 parts. The down APEO removal scheme provided by the application can effectively remove APEO in down, and can treat down with excessive APEO content to less than 50 ppm, while not damaging the original performance indexes of the down.

Description

Technical Field

[0001] This invention pertains to methods for treating harmful substances in the down industry, specifically relating to a method for removing APEO from down. Background Technology

[0002] Alkylphenol polyoxyethylene ethers (APEOs) are a widely used class of nonionic surfactants. Their ecotoxicity issues mainly concern their safety and biodegradability. Safety includes acute toxicity, aquatic toxicity, skin irritation, teratogenicity, and mutagenicity. Given their significant toxicity, the European Union's Chemicals Regulatory Commission (ECRC) included APEOs in the REACH regulation, requiring that their content in clothing products not exceed 100 mg / kg. The Oeko-Tex Standard 100 issued by the International Association for Eco-Textile Research and Testing requires that the total content of alkylphenols and alkylphenol polyoxyethylene ethers in textiles not exceed 100 mg / kg. my country's current national standard GB / T 14272-2021 stipulates that the APEO content in down jacket fillings must not exceed 100 mg / kg.

[0003] A crucial step in the down production process is washing, where feathers are cleaned with water containing down detergent to remove grease, dust, and odors. Typically, the detergent dosage is 1%–2%. However, due to the low cost and excellent functionality of APEO (application-dependent amino acids), it is added in large quantities to down detergents, resulting in APEO residue after washing. Since down is primarily composed of protein, its molecules contain numerous amino and hydroxyl groups, which can form hydrogen bonds with the ethoxy groups in APEO molecules. Furthermore, down has a large surface area, making it easy for APEO to be adsorbed onto its surface through electrostatic interactions. Therefore, compared to textiles, if not thoroughly cleaned, down often contains higher levels of residual APEO.

[0004] Due to the lack of mandatory national standards, APEO is still widely used in my country's down industry. Excessive use of APEO is detrimental to environmental protection; it is also harmful to the health of consumers; for manufacturing plants, if the washing system becomes contaminated, it may require replacing the water supply, resulting in unnecessary losses; and for foreign trade enterprises, it increases the technical risks associated with exporting their products. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for removing APEO from down, which is used to clean down with excessive APEO content after washing to below the acceptable limit, while not damaging the original properties of down such as loft, residual ester content, and fiber structure, and saving water.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a method for removing APEO from down feathers, comprising the following steps:

[0008] Step 1: Place the down to be treated in a washing machine, add water and down APEO removal agent, wherein the mass ratio of the down to be treated to the water is 1:13, and the dosage ratio of the down APEO removal agent to the water is 2.8 g / L. Wash at 42-45℃ for 25 minutes, and then centrifuge and spin dry the down. The down APEO removal agent, by mass parts, comprises the following components: 30-40 parts lauryl alcohol polyoxyethylene ether, 12-18 parts rosin acid polyoxyethylene ester, 8-14 parts isotridecyl alcohol polyoxyethylene ether, 1.6-2.4 parts dodecyl glucamide, 2-7 parts isopropanol, 0.15-0.25 parts polyvinylpyrrolidone, 0.03-0.11 parts hydroxymethyl cellulose, 22-32 parts magnesium chloride, 3.0-5.5 parts cyclodextrin, and 80-112 parts deionized water.

[0009] Step 2: Rinse the down treated in Step 1 with water at 30-35°C for 30 minutes, wherein the mass ratio of the down treated in Step 1 to the water in Step 2 is 1:20. After rinsing, centrifuge and spin-dry the down.

[0010] Preferably, the down to be treated is any type of down that has been washed with an aqueous solution of down cleaning agent so that its APEO content exceeds the limits specified in GB / T14272-2021.

[0011] Preferably, the degree of polymerization of the lauryl alcohol polyoxyethylene ether is 7 to 10.

[0012] Preferably, the degree of polymerization of the rosin acid polyoxyethylene ester is 15 to 18.

[0013] Preferably, the degree of polymerization of the isomeric tridecyl alcohol polyoxyethylene ether is 7 to 10.

[0014] Preferably, the molecular weight of the polyvinylpyrrolidone is 9000 to 18000.

[0015] Preferably, the molecular weight of the hydroxymethyl cellulose is 220,000 to 380,000.

[0016] Preferably, the down APEO removal agent comprises, by weight parts, the following components: 32-36 parts lauryl alcohol polyoxyethylene ether, 14-16 parts rosin acid polyoxyethylene ester, 10-13 parts isotridecyl alcohol polyoxyethylene ether, 1.8-2.1 parts dodecyl glucamide, 4-5 parts isopropanol, 0.18-0.21 parts polyvinylpyrrolidone, 0.05-0.09 parts hydroxymethyl cellulose, 25-29 parts magnesium chloride, 3.6-4.5 parts cyclodextrin, and 86-106 parts deionized water.

[0017] Secondly, the present invention provides a down APEO removal agent, which comprises, by weight parts, the following components: 30-40 parts lauryl alcohol polyoxyethylene ether, 12-18 parts rosin acid polyoxyethylene ester, 8-14 parts isotridecyl alcohol polyoxyethylene ether, 1.6-2.4 parts dodecyl glucamide, 2-7 parts isopropanol, 0.15-0.25 parts polyvinylpyrrolidone, 0.03-0.11 parts hydroxymethyl cellulose, 22-32 parts magnesium chloride, 3.0-5.5 parts cyclodextrin, and 80-112 parts deionized water.

[0018] The preferred embodiment of the down APEO removal agent in the second aspect is the same as the down APEO removal agent in the down APEO removal method in the first aspect, and will not be repeated here.

[0019] The beneficial effects of this invention are:

[0020] a. The down APEO removal agent in the down APEO removal method provided by the present invention has excellent permeability and wettability. The unique material selection and ratio can treat down with excessive APEO content to below 50ppm.

[0021] b. The APEO removal method for down provided by this invention can achieve the treatment effect with the minimum amount of water, while not affecting the down content and residual ester rate of the finished down, and is low-carbon and environmentally friendly.

[0022] c. The APEO removal agent in the down APEO removal method provided by the present invention contains protective additives dodecyl glucamide and cyclodextrin, which can remove APEO from down without damaging the down's loft, down content and other performance indicators. Detailed Implementation

[0023] The following describes preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

[0024] Preparation of APEO removal agent for down feathers

[0025] Example 1

[0026] A down APEO removal agent, by weight, comprises the following components: 35 parts lauryl alcohol polyoxyethylene ether, 16 parts rosin acid polyoxyethylene ester, 12 parts isotretinoin polyoxyethylene ether, 2.1 parts dodecyl glucamide, 5 parts isopropanol, 0.21 parts polyvinylpyrrolidone, 0.08 parts hydroxymethyl cellulose, 28 parts magnesium chloride, 4.2 parts cyclodextrin, and 98 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 1.

[0027] Example 2

[0028] A down APEO removal agent, by weight, comprises the following components: 30 parts lauryl alcohol polyoxyethylene ether, 18 parts rosin acid polyoxyethylene ester, 14 parts isotretinoin polyoxyethylene ether, 1.9 parts dodecyl glucamide, 6 parts isopropanol, 0.18 parts polyvinylpyrrolidone, 0.07 parts hydroxymethyl cellulose, 30 parts magnesium chloride, 3.8 parts cyclodextrin, and 100 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 2.

[0029] Example 3

[0030] A down APEO removal agent, by weight, comprises the following components: 40 parts lauryl alcohol polyoxyethylene ether, 15 parts rosin acid polyoxyethylene ester, 9 parts isotretinoin polyoxyethylene ether, 2.2 parts dodecyl glucamide, 4 parts isopropanol, 0.20 parts polyvinylpyrrolidone, 0.09 parts hydroxymethyl cellulose, 29 parts magnesium chloride, 3.2 parts cyclodextrin, and 102 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 3.

[0031] Example 4

[0032] A down APEO removal agent, by weight, comprises the following components: 38 parts lauryl alcohol polyoxyethylene ether, 12 parts rosin acid polyoxyethylene ester, 14 parts isotretinoin polyoxyethylene ether, 2.2 parts dodecyl glucamide, 7 parts isopropanol, 0.15 parts polyvinylpyrrolidone, 0.10 parts hydroxymethyl cellulose, 24 parts magnesium chloride, 4.8 parts cyclodextrin, and 110 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 4.

[0033] Example 5

[0034] A down APEO removal agent, by weight, comprises the following components: 36 parts lauryl alcohol polyoxyethylene ether, 18 parts rosin acid polyoxyethylene ester, 8 parts isotretinoin polyoxyethylene ether, 1.6 parts dodecyl glucamide, 2 parts isopropanol, 0.25 parts polyvinylpyrrolidone, 0.06 parts hydroxymethyl cellulose, 32 parts magnesium chloride, 5.5 parts cyclodextrin, and 112 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 5.

[0035] Example 6

[0036] A down APEO removal agent, by weight, comprises the following components: 39 parts lauryl alcohol polyoxyethylene ether, 17 parts rosin acid polyoxyethylene ester, 13 parts isotretinoin polyoxyethylene ether, 2.0 parts dodecyl glucamide, 3 parts isopropanol, 0.23 parts polyvinylpyrrolidone, 0.11 parts hydroxymethyl cellulose, 27 parts magnesium chloride, 3.6 parts cyclodextrin, and 90 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 6.

[0037] Example 7

[0038] A down APEO removal agent, by weight, comprises the following components: 32 parts lauryl alcohol polyoxyethylene ether, 18 parts rosin acid polyoxyethylene ester, 10 parts isotretinoin polyoxyethylene ether, 2.3 parts dodecyl glucamide, 6 parts isopropanol, 0.22 parts polyvinylpyrrolidone, 0.05 parts hydroxymethyl cellulose, 26 parts magnesium chloride, 4.4 parts cyclodextrin, and 96 parts deionized water. The lauryl alcohol polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 8.5. The rosin acid polyoxyethylene ester has a degree of polymerization of 15-18, with an average degree of polymerization of 17. The isotretinoin polyoxyethylene ether has a degree of polymerization of 7-10, with an average degree of polymerization of 9. The polyvinylpyrrolidone has a molecular weight of 9000-18000, with an average molecular weight of 13000. The hydroxymethyl cellulose has a molecular weight of 220,000-380,000, with an average molecular weight of 300,000. Magnesium chloride and cyclodextrin were added to deionized water and stirred to dissolve. Then, hydroxymethyl cellulose was added and stirred to dissolve. Finally, other components were added and stirred to obtain a slightly yellow, uniform, transparent, and viscous down APEO removal agent 7.

[0039] To illustrate the superior effect of the APEO removal agent for down feathers of the present invention, the following comparative examples were also made.

[0040] Comparative Example 1

[0041] By changing the degree of polymerization of lauryl alcohol polyoxyethylene ether in Example 1 above to 11-16, with an average degree of polymerization of 14, and keeping other conditions unchanged, down APEO removal agent 8 was obtained.

[0042] Comparative Example 2

[0043] The degree of polymerization of rosin acid polyoxyethylene ester in Example 1 was changed to 20-25, with an average degree of polymerization of 23, while other conditions remained unchanged, to obtain down APEO removal agent 9.

[0044] Comparative Example 3

[0045] The degree of polymerization of isomeric tridecyl alcohol polyoxyethylene ether in Example 1 was changed to 11-15, with an average degree of polymerization of 13, while other conditions remained unchanged, to obtain down APEO removal agent 10.

[0046] Comparative Example 4

[0047] By removing dodecyl glucamide from the component in Example 1 above, while keeping other conditions unchanged, we obtained down APEO removal agent 11.

[0048] Comparative Example 5

[0049] By removing the cyclodextrin component from Example 1 above, while keeping other conditions unchanged, we obtained down APEO removal agent 12.

[0050] Comparative Example 6

[0051] By changing the dodecyl glucamide component in Example 1 to 3 parts while keeping other conditions unchanged, we obtained down APEO removal agent 13.

[0052] Comparative Example 7

[0053] By changing the number of cyclodextrin components in Example 1 above to 8 parts, while keeping other conditions unchanged, APEO removal agent 14 for down feathers was obtained.

[0054] APEO removal method A for down feathers

[0055] Step 1: Place the down to be treated in a washing machine, add water and down APEO removal agent. The mass ratio of down to water is 1:13, and the dosage ratio of down APEO removal agent to water is 2.8 g / L. Wash at 45°C for 25 minutes, then centrifuge and dry the down. The down APEO removal agents used are 14 types prepared in the above examples and comparative examples, used to treat the down. The down to be treated is various types of down that have been washed with a down cleaning agent aqueous solution to achieve an APEO content exceeding that specified in GB / T 14272-2021. For comparison, the down used in Example 1, Comparative Examples 1-10, and the blank control were the same type of down with the same APEO content.

[0056] Step 2: Rinse the down treated in Step 1 with water at 35°C for 30 minutes. The mass ratio of the down treated in Step 1 to the water in Step 2 is 1:20. After rinsing, centrifuge and spin-dry the down, then dry it and wait for testing.

[0057] To illustrate the superior effectiveness of the APEO removal method for down feathers of the present invention, the following comparative examples were also provided.

[0058] Comparative Example 8: APEO Removal Method B for Down Feathers

[0059] The cleaning temperature in step 1 of the down APEO removal method A was changed to 50°C, and the down to be treated was treated with the down APEO removal agent 1 prepared in Example 1 above, while other conditions remained unchanged.

[0060] Comparative Example 9: APEO Removal Method C for Down Feathers

[0061] The washing time in step 1 of method A for removing APEO from down was changed to 30 minutes, and the down to be treated was treated with the down APEO removal agent 1 prepared in Example 1 above, while other conditions remained unchanged.

[0062] Comparative Example 10: APEO Removal Method D for Down Feathers

[0063] The washing time in step 1 of the down APEO removal method A was changed to 20 minutes, and the down to be treated was treated with the down APEO removal agent 1 prepared in Example 1 above, while other conditions remained unchanged.

[0064] Performance testing and effect evaluation

[0065] The down to be treated was processed using the 17 down APEO removal agents described above according to the aforementioned down APEO removal methods. The APEO values ​​of the down before and after treatment in Examples 1-7 and Comparative Examples 1-7 were tested using the method specified in 5.6.2 of GB / T 14272-2021 "Down Garments". The results are shown in the table below:

[0066] Table 1. Detection results of APEO removal methods in down feathers

[0067]

[0068] As shown in the table above, the down treated with the APEO removal agents of Examples 1 to 7 of this application using the optimal treatment method has an APEO content of less than 50 mg / kg, which meets the relevant domestic and international regulatory requirements.

[0069] Comparing the down treated in Example 1 and Comparative Example 1, it was found that the degree of polymerization of lauryl alcohol polyoxyethylene ether in Example 1, which was 7-10, had a better APEO removal effect than the degree of polymerization of lauryl alcohol polyoxyethylene ether in Comparative Example 1, which was 11-16. This indicates that when the degree of polymerization of lauryl alcohol polyoxyethylene ether is 7-10, it can better displace APEO from the down and effectively remove APEO.

[0070] Comparing the down treated in Example 1 and Comparative Example 2, it was found that the degree of polymerization of rosin acid polyoxyethylene ester in Example 1 (15-18) was better than that of rosin acid polyoxyethylene ester in Comparative Example 2 (20-25), thus exhibiting a better APEO removal effect. This indicates that when the degree of polymerization of rosin acid polyoxyethylene ester is 15-18, it can better displace APEO from the down and effectively remove APEO.

[0071] Comparing the down treated in Example 1 and Comparative Example 3, it was found that the degree of polymerization of isotridecyl alcohol polyoxyethylene ether in Example 1, which was 7-10, was better at removing APEO than that in Comparative Example 3, which had a degree of polymerization of 11-15. This indicates that when the degree of polymerization of isotridecyl alcohol polyoxyethylene ether is 7-10, it can better displace APEO from the down and effectively remove APEO.

[0072] Comparing the down treated in Example 1 and Comparative Example 4, it was found that the APEO removal effect of Comparative Example 4 was worse, and the loft of the down treated with the APEO removal agent prepared in Comparative Example 4 was worse, which would affect its subsequent performance.

[0073] Comparing the down treated with Example 1 and Comparative Example 5, it was found that the APEO removal effect of Comparative Example 5 was worse, and the down content of the down treated with the APEO removal agent prepared in Comparative Example 5 decreased, which would affect the subsequent performance.

[0074] Comparing the down treated in Example 1 and Comparative Example 6, it was found that the APEO removal effect of Comparative Example 6 was not affected, but the increase in dodecyl glucamide content significantly increased the economic cost.

[0075] Comparing the down treated in Example 1 and Comparative Example 7, it was found that Comparative Example 7 had a worse effect on removing APEO, which indicates that excessive cyclodextrin dosage can affect the synergistic effect of other components on APEO removal.

[0076] Comparing Example 1 with washing with water but without using the APEO removal agent of this application, Example 1 showed better APEO removal.

[0077] Comparing the down treated with removal method A in Example 1 and with removal method B in Comparative Example 8, it was found that removal method B improved the APEO removal rate, but the residual grease content of the treated down was significantly reduced, and the loft decreased. A comprehensive analysis of domestic and international standards indicates that the optimal target range for the residual grease content of goose and duck down raw materials after washing should be controlled within 0.5% to 1.0%. This is because a low residual grease content makes the down fibers more susceptible to damage during physical friction while wearing, while a high residual grease content makes the down prone to developing odors during storage. The down to be treated in this invention is a washed product, and its residual grease content already meets the requirements. The residual grease content of the down treated with the APEO removal method of this invention did not change significantly compared to before treatment, and the APEO removal effect was achieved.

[0078] Comparing the down treated with removal method A in Example 1 and removal method C in Comparative Example 9, it was found that removal method C could improve the APEO removal rate, but the residual ester content of the treated down was significantly reduced. The residual ester content of the down treated with the APEO removal method of the present invention did not change significantly compared to before treatment, and the required APEO removal effect was achieved.

[0079] Comparing the down treated by removal method A in Example 1 and by removal method D in Comparative Example 10, it was found that the washing time of removal method D was insufficient and could not meet the APEO removal requirements.

Claims

1. A method for removing APEO from down feathers, characterized in that, Includes the following steps: Step 1: Place the down to be treated in a washing machine, add water and down APEO removal agent, wherein the mass ratio of the down to be treated to the water is 1:13, and the dosage ratio of the down APEO removal agent to the water is 2.8 g / L. Wash at 42-45℃ for 25 minutes, and then centrifuge and spin dry the down; wherein the down APEO removal agent, by mass parts, comprises the following components: 30-40 parts lauryl polyoxyethylene ether, 12-18 parts rosin acid polyoxyethylene ester, 8-14 parts isotridecyl polyoxyethylene ether, 1.6-2.4 parts dodecyl glucamide, 2-7 parts isopropanol, 0.15-0.25 parts polyvinylpyrrolidone, 0.03-0.11 parts hydroxymethyl cellulose, 22-32 parts magnesium chloride, 3.0-5.5 parts cyclodextrin, and 80-112 parts deionized water; Step 2: Rinse the down treated in Step 1 with water at 30-35°C for 30 minutes, wherein the mass ratio of the down treated in Step 1 to the water in Step 2 is 1:

20. After rinsing, centrifuge and spin dry the down. The degree of polymerization of the lauryl alcohol polyoxyethylene ether is 7 to 10; The degree of polymerization of the rosin acid polyoxyethylene ester is 15-18; The degree of polymerization of the isomeric tridecyl alcohol polyoxyethylene ether is 7 to 10; The down to be treated is various types of down that have been washed with a down cleaning agent aqueous solution to make the APEO content exceed the requirements of GB / T 14272-2021.

2. The method for removing APEO from down feathers according to claim 1, characterized in that, The degree of polymerization of the lauryl alcohol polyoxyethylene ether is 7 to 10, with an average degree of polymerization of 8.

5.

3. The method for removing APEO from down feathers according to claim 1, characterized in that, The degree of polymerization of the rosin acid polyoxyethylene ester is 15-18, with an average degree of polymerization of 17.

4. The method for removing APEO from down feathers according to claim 1, characterized in that, The degree of polymerization of the isomeric tridecyl alcohol polyoxyethylene ether is 7-10, with an average degree of polymerization of 9.

5. The method for removing APEO from down feathers according to claim 1, characterized in that, The molecular weight of the polyvinylpyrrolidone is 9000 to 18000.

6. The method for removing APEO from down feathers according to claim 1, characterized in that, The molecular weight of the hydroxymethyl cellulose is between 220,000 and 380,000.

7. The method for removing APEO from down feathers according to claim 1, characterized in that, The down APEO removal agent comprises, by weight, the following components: 32-36 parts lauryl alcohol polyoxyethylene ether, 14-16 parts rosin acid polyoxyethylene ester, 10-13 parts isotridecyl alcohol polyoxyethylene ether, 1.8-2.1 parts dodecyl glucamide, 4-5 parts isopropanol, 0.18-0.21 parts polyvinylpyrrolidone, 0.05-0.09 parts hydroxymethyl cellulose, 25-29 parts magnesium chloride, 3.6-4.5 parts cyclodextrin, and 86-106 parts deionized water.

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