Water-repellent and oil-resistant goose down and preparation method thereof

Abstract

The invention relates to water-repellent and oil-stain-resistant goose down and a preparation method thereof.The preparation method specifically comprises the following steps that degreased, cleaned and dried goose down serves as a raw material, oxidation treatment is conducted on the goose down through a composite reagent, and oxidized goose down is obtained after cleaning and dewatering; performing plasma pretreatment on the oxidized goose down to obtain pretreated goose down; carrying out padding treatment on the pretreated goose down by using a water-repellent oil-resistant finishing agent; and drying the padded goose down to obtain the water-repellent and oil-resistant goose down. Oxidation treatment and plasma pretreatment are firstly performed on the goose down before the goose down is subjected to padding treatment by the water-repellent and oil-resistant finishing agent, so that the water-repellent and oil-resistant performance of a final goose down product is improved, the maximum water contact angle can reach 148.2 degrees, the maximum oil contact angle can reach 136.5 degrees, and the water-repellent and oil-resistant performance of the goose down product is improved. The final goose down product prepared by the method has strong water-repellent and oil-resistant performance, and is convenient to popularize and apply in the market.

Description

Technical Field

[0001] This invention belongs to the field of goose down processing technology, specifically relating to a water-repellent and oil-resistant goose down and its preparation method. Background Technology

[0002] Goose down, as a natural insulating material, is widely used in high-end clothing and bedding due to its excellent warmth, lightness, and breathability. However, the surface of natural goose down is rich in hydrophilic keratin, which easily absorbs moisture and oily stains from the environment. Once oil stains penetrate, they are difficult to clean thoroughly, and repeated washing can damage the down cluster structure. In addition, water and oil absorption can accelerate the aging of goose down, making it prone to clumping, odors, and other problems, which is detrimental to its marketability.

[0003] In existing technologies, the main method for improving the water and oil repellency of goose down is treatment with fluorocarbon compound finishing agents. While this treatment imparts a certain degree of water and oil repellency to the goose down, it also poses environmental risks (such as persistent pollutants like perfluorooctanoic acid (PFOA) / perfluorooctane sulfonyl compounds (PFOS)). Therefore, it is essential to develop water and oil repellent finishing agents containing natural ingredients that are highly safe and stable, and exploring their application in the actual production of water and oil repellent goose down is of great significance. Based on the above problems, this invention provides water and oil repellent goose down and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a water-repellent and oil-resistant goose down and its preparation method in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A method for preparing water-repellent and oil-repellent goose down specifically includes the following steps: Step 1: Using degreased, cleaned and dried goose down as raw material, the goose down is oxidized using a compound reagent. After washing and dehydration, oxidized goose down is obtained. The raw materials for preparing the compound reagent include, by weight, 52-60 parts of dilute acetic acid, 20-25 parts of transglutaminase, 10-16 parts of curcumin, and 10-15 parts of fatty alcohol polyoxyethylene ether. Step 2: The oxidized goose down obtained in Step 1 is subjected to plasma pretreatment to obtain pretreated goose down; Step 3: Apply a water-repellent and oil-repellent finishing agent to the pretreated goose down for padding treatment; wherein, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, include 30-35 parts rice bran wax, 18-24 parts amino-terminated silicone oil, 15-20 parts nano silica aqueous solution, 12-18 parts plant extract, 7-12 parts hydroxypropyl chitosan, 3-5 parts silane coupling agent, and 3-5 parts surfactant; Step 4: After the goose down has been impregnated and padded in Step 3, it is dried to obtain water-repellent and oil-resistant goose down.

[0006] As a further optimization of the present invention, the amount of the composite reagent is 3-8 wt% of goose down.

[0007] As a further optimization of the present invention, in step one, the oxidation treatment specifically involves first mixing transglutaminase, curcumin, and fatty alcohol polyoxyethylene ether in water, soaking the goose down at 45-60°C for 40-60 minutes, and then adding dilute acetic acid with a mass concentration of 6-15% and continuing to soak for 30-50 minutes, stirring at 5-10 rpm throughout the process; the mass ratio of goose down to water is 1:25-30.

[0008] As a further optimization of the present invention, in step two, the plasma pretreatment is to pretreat the goose down with nitrogen low-temperature plasma, with a power of 45-65W, a pressure of 20-30Pa, a time of 1-3min, and a temperature of 30-40℃.

[0009] As a further optimization of the present invention, the amount of the water-repellent and oil-repellent finishing agent is 4-10 wt% of the goose down.

[0010] As a further optimization of the present invention, in step three, the padding process specifically involves adding a water-repellent and oil-repellent finishing agent into deionized water, heating and maintaining the temperature to 65-90°C to obtain a water-repellent and oil-repellent finishing liquid, and using this water-repellent and oil-repellent finishing liquid to perform two dips and two padding processes on the goose down, with a bath ratio of 1:20-25 and a padding rate of 65%-80%.

[0011] The bath ratio of 1:20-25 indicates that 1 unit mass of goose down requires 20-25 units of water-repellent and oil-resistant finishing solution (deionized water + water-repellent and oil-resistant finishing agent) for treatment.

[0012] As a further optimization of the present invention, the mass concentration of the nano-silica aqueous solution is 20-25%; The silane coupling agent includes at least one of silane coupling agent KH550 and silane coupling agent KH590.

[0013] As a further optimization of the present invention, the surfactant includes at least one of polyoxyethylene fatty acids and alkyl polysaccharides.

[0014] As a further optimization of the present invention, the plant extract is Lygodium japonicum-corn bran extract. The specific method for obtaining it is as follows: weigh Lygodium japonicum-corn bran powder (i.e., Lygodium japonicum powder and corn bran powder in a mass ratio of 1:1), add it to a methanol solution with a mass concentration of 60-75% at a mass ratio of 1:6-10, heat and reflux for extraction for 2-3 hours, cool and filter with a microporous membrane for storage.

[0015] A water-repellent and oil-resistant goose down is prepared by the above-described method.

[0016] The beneficial effects of this invention are as follows: This invention improves the water and oil repellency of the final down product by subjecting it to oxidation and plasma pretreatment before impregnation with a water-repellent and oil-repellent finishing agent. The water contact angle can reach up to 148.2° and the oil contact angle can reach up to 136.5°, indicating that the final down product prepared by this invention has strong water and oil repellency, making it easy to promote and apply in the market.

[0017] The present invention also found that the compound reagent formulation is particularly critical in the oxidation process, and verified that transglutaminase can only achieve a synergistic effect when combined with curcumin, which can significantly improve the water repellency and oil stain resistance of the final goose down products.

[0018] The water-repellent and oil-resistant finishing agent used in this invention contains Lygodium japonicum-corn bran extract (methanol extract). Experimental results show that Lygodium japonicum-corn bran extract (methanol extract) can significantly improve the water-repellent and oil-resistant properties of goose down.

[0019] This invention also compared the effects of water-repellent and oil-repellent finishing agents under different storage conditions on the water-repellent and oil-repellent properties of the final goose down products. It was found that when the water-repellent and oil-repellent finishing agent mixture system was supplemented with Lygodium japonicum-corn bran extract (methanol extract), its thermal stability was improved. In actual production, this beneficial effect can reduce the storage requirements of the water-repellent and oil-repellent finishing agent, and enterprises can save on storage, transportation and other costs. Detailed Implementation

[0020] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Material Dilute acetic acid: mass concentration of 6-15% (preferably 9.5%), purchased from Shanghai Koraman Reagent Co., Ltd.; transglutaminase purchased from Hubei Xinhongli Chemical Co., Ltd., purity 99%; curcumin purchased from Zhangjiajie Jiurui Biotechnology Co., Ltd., purity 95%; fatty alcohol polyoxyethylene ether purchased from Taian Jiangzhou Biotechnology Co., Ltd., purity 99%.

[0022] Nano-silica aqueous solution: mass concentration of 20-25% (preferably 22%), purchased from Zhejiang Zhitai Nano-Micro New Materials Co., Ltd.; rice bran wax purchased from Hubei Jiangmin Taihua Chemical Co., Ltd., purity 99%; amino-terminated silicone oil purchased from Hubei Shixing Chemical Co., Ltd., purity 99%; hydroxypropyl chitosan purchased from Shandong Yatu Biotechnology Co., Ltd., purity 99%; alkyl polysaccharide purchased from Hubei Chengfeng Chemical Co., Ltd., purity 99%.

[0023] Silane coupling agent: at least one of silane coupling agent KH550 and silane coupling agent KH590 (preferably silane coupling agent KH550).

[0024] Surfactant: at least one of polyoxyethylene fatty acid and alkyl polysaccharide (preferably alkyl polysaccharide).

[0025] Plant extracts: Lygodium japonicum-corn bran extract (Lygodium japonicum extract, corn bran extract, Lygodium japonicum-rice bran extract, Lygodium japonicum-wheat bran extract, Pteris vittata-corn bran extract, and Brassica juncea-corn bran extract). The specific method for obtaining this extract is as follows: Weigh out Lygodium japonicum-corn bran powder (Lygodium japonicum powder, corn bran powder, Lygodium japonicum-rice bran powder, Lygodium japonicum-wheat bran powder, Pteris vittata-corn bran powder, and Brassica juncea-corn bran powder; when two types of powder are used, the mass ratio is... Add the extract at a mass ratio of 1:1 to 1:6-10 (preferably 1:8) to a methanol solution with a mass concentration of 60-75% (preferably 65%), heat under reflux for 2-3 hours (preferably 2.5 hours), cool, filter through a microporous membrane, and store for later use. The only difference between the Lygodium japonicum-corn bran extract and the Lygodium japonicum-corn bran extract is that an equal mass of water is used instead of methanol for extraction. Lygodium japonicum, Pteris vittata, and Pteris multifida are all perennial ferns and can be used as traditional Chinese medicine.

[0026] Unless otherwise specified, all methods used in the following examples can be performed using conventional methods. Other materials and reagents used can be obtained commercially unless otherwise specified.

[0027] method 2.1 Preparation of water-repellent and oil-repellent goose down 2.1.1 Preparation of the composite reagent for oxidation treatment: The raw materials, by weight, include 52 parts dilute acetic acid, 25 parts transglutaminase, 10 parts curcumin, and 13 parts fatty alcohol polyoxyethylene ether. The amount of the composite reagent is 5.5 wt% of the goose down. Using degreased, washed, and dried goose down as raw material, transglutaminase, curcumin, and fatty alcohol polyoxyethylene ether are first mixed in water, and the goose down is soaked at 45-60℃ for 40-60 min (preferably at 52℃ for 55 min) to carry out a cross-linking reaction. Then, 9.5% dilute acetic acid is added, and the mixture is continuously soaked at 5-10 rpm (preferably 7 rpm) to carry out an oxidation reaction. The mass ratio of goose down to water is 1:25-30 (preferably 1:27).

[0028] 2.1.2 The oxidized goose down obtained above is pretreated with nitrogen low-temperature plasma at a power of 45-65W, a pressure of 20-30Pa, a time of 1-3min, and a temperature of 30-40℃ (preferably 55W, 25Pa, 1.5min, 34℃). Pretreated goose down is obtained after plasma pretreatment.

[0029] 2.1.3. The pretreated goose down is subjected to padding treatment using a water-repellent and oil-repellent finishing agent. Specifically, the water-repellent and oil-repellent finishing agent is added to deionized water and heated to 65-90℃ (preferably 75℃±5℃) to obtain a water-repellent and oil-repellent finishing solution. The goose down is then subjected to two dips and two paddings using this water-repellent and oil-repellent finishing solution, with a liquor ratio of 1:20-25 (preferably 1:24). The padding residue after the first dip and padding is 68%, and the padding residue after the second dip and padding is 78%.

[0030] The raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, include 30 parts rice bran wax, 24 parts amino-terminated silicone oil, 15 parts a 22% nano-silica aqueous solution, 12 parts Lygodium japonicum-corn bran extract, 12 parts hydroxypropyl chitosan, 3 parts silane coupling agent KH550, and 4 parts alkyl polysaccharide. The amount of water-repellent and oil-repellent finishing agent used is 6.5 wt% of the goose down.

[0031] 2.1.4 After the goose down undergoes impregnation treatment in step 2.1.3, it is dried to obtain water-repellent and oil-resistant goose down, which is designated as group S1 goose down.

[0032] Based on the S1 group of goose down, further adjustments were made to obtain the following groups of goose down: S2 group goose down: Based on the preparation method of S1 group goose down, only the ratio of the compound reagent was adjusted in this experimental group. After adjustment, the raw materials for preparing the compound reagent, by weight, include 56 parts dilute acetic acid, 23 parts transglutaminase, 11 parts curcumin, and 10 parts fatty alcohol polyoxyethylene ether; the rest are consistent with S1 group goose down.

[0033] S3 group goose down: Based on the preparation method of S1 group goose down, only the ratio of the compound reagent was adjusted in this experimental group. After adjustment, the raw materials for the preparation of the compound reagent, by weight, include 60 parts dilute acetic acid, 20 parts transglutaminase, 10 parts curcumin, and 10 parts fatty alcohol polyoxyethylene ether; the rest are consistent with S1 group goose down.

[0034] Group S4 goose down: Based on the preparation method of Group S2 goose down, only the ratio of water-repellent and oil-repellent finishing agent was adjusted in this experimental group. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts Lygodium japonicum-corn bran extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of goose down; the rest were consistent with Group S2 goose down.

[0035] Group S5 goose down: Based on the preparation method of Group S2 goose down, only the ratio of water-repellent and oil-repellent finishing agent was adjusted in this experimental group. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 35 parts rice bran wax, 18 parts amino-terminated silicone oil, 16 parts 22% nano silica aqueous solution, 18 parts Lygodium japonicum-corn bran extract, 7 parts hydroxypropyl chitosan, 3 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with Group S2 goose down.

[0036] 2.2 Controlled Experimental Design To further explore the factors affecting the various properties of the final goose down products during the preparation process, degreased, washed, and dried goose down was used as a blank control, and the following control experiment was designed: 2.2.1 Control Experiment Design for Preparation Process Group D1 goose down: Based on the preparation method of Group S4 goose down, step 2.1.1 (oxidation treatment) was omitted in this control group; the rest were consistent with Group S4 goose down.

[0037] D2 group goose down: Based on the preparation method of S4 group goose down, step 2.1.2 (plasma pretreatment) was omitted in this control group; the rest were consistent with S4 group goose down.

[0038] D3 group goose down: Based on the preparation method of S4 group goose down, steps 2.1.1 (oxidation treatment) and 2.1.2 (plasma pretreatment) were omitted in this control group; the rest were consistent with S4 group goose down.

[0039] 2.2.2 Control Experiment Design for Composite Reagent Components D4 group goose down: Based on the preparation method of S4 group goose down, the composition of the composite reagent used for oxidation treatment in this control group was adjusted. After adjustment, the raw materials for preparing the composite reagent, by weight, included 56 parts of dilute acetic acid, 34 parts of transglutaminase, and 10 parts of fatty alcohol polyoxyethylene ether; the rest were consistent with those of S4 group goose down.

[0040] D5 group goose down: Based on the preparation method of S4 group goose down, the composition of the composite reagent used for oxidation treatment in this control group was adjusted. After adjustment, the raw materials for preparing the composite reagent, by weight, included 56 parts dilute acetic acid, 34 parts curcumin, and 10 parts fatty alcohol polyoxyethylene ether; the rest were consistent with those of S4 group goose down.

[0041] D6 group goose down: Based on the preparation method of S4 group goose down, the composition of the composite reagent used for oxidation treatment in this control group was adjusted. After adjustment, the raw materials for preparing the composite reagent, by weight, included 56 parts dilute acetic acid, 23 parts transglutaminase, 11 parts quercetin, and 10 parts fatty alcohol polyoxyethylene ether; the rest were consistent with those of S4 group goose down.

[0042] D7 group goose down: Based on the preparation method of S4 group goose down, the composition of the composite reagent used for oxidation treatment in this control group was adjusted. After adjustment, the raw materials for preparing the composite reagent, by weight, included 56 parts dilute acetic acid, 23 parts transglutaminase, 11 parts dihydrocurcumin, and 10 parts fatty alcohol polyoxyethylene ether; the rest were consistent with those of S4 group goose down.

[0043] Group D8 goose down: Based on the preparation method of Group S4 goose down, the oxidation treatment method in this control group was adjusted. The adjusted method was as follows: using degreased, washed and dried goose down as raw material, transglutaminase, curcumin and fatty alcohol polyoxyethylene ether were mixed in water and soaked at 52°C for 55 minutes to carry out cross-linking reaction, with stirring at 7 rpm during the process; the mass ratio of goose down to water was 1:27; all other aspects were consistent with Group S4 goose down.

[0044] Group D9 goose down: Based on the preparation method of Group S4 goose down, the oxidation treatment method in this control group was adjusted. The adjusted method was to use degreased, cleaned and dried goose down as raw material, mix it with 9.5% dilute acetic acid in water, and soak the goose down at 52℃ for 45 minutes to carry out the oxidation reaction, stirring at 7 rpm during the process; the mass ratio of goose down to water was 1:27; all other aspects were the same as those of Group S4 goose down.

[0045] 2.2.3. Control Experiment Design for Water-Repellent and Oil-Resistant Finishing Agent Components Group D10 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts Lygodium japonicum extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with those of Group S4 goose down.

[0046] Group D11 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts corn bran extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with those of Group S4 goose down.

[0047] Group D12 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts Lygodium japonicum-rice bran extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with Group S4 goose down.

[0048] Group D13 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts Lygodium japonicum-wheat bran extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with Group S4 goose down.

[0049] Group D14 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts fern-corn bran extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with Group S4 goose down.

[0050] Group D15 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts *Haloxylon ammodendron*-corn bran extract, 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with Group S4 goose down.

[0051] Group D16 goose down: Based on the preparation method of Group S4 goose down, the composition of the water-repellent and oil-repellent finishing agent in this control group was adjusted. After adjustment, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, included 32 parts rice bran wax, 21 parts amino-terminated silicone oil, 17 parts 22% nano silica aqueous solution, 15 parts Lygodium japonicum-corn bran extract (water extract), 7 parts hydroxypropyl chitosan, 5 parts silane coupling agent KH550, and 3 parts alkyl polysaccharide glycoside; the amount of water-repellent and oil-repellent finishing agent was 6.5 wt% of the goose down; the rest were consistent with Group S4 goose down.

[0052] Performance testing Experiment 1: The water contact angle (WCA) and oil contact angle (OCA) of the goose down surface in the experimental groups (S1-5), control group (D1-16), and blank group were measured using a German Krüss DSA100 contact angle measuring instrument. The contact angle measurement range was 0~180°, and the measurement accuracy was ±0.1°. The icing test results are recorded in Table 1 below: Table 1. Test Data Recording Table for Water Repellency and Oil Repellency of Goose Down ; Experimental Conclusions: As shown in Table 1, oxidative treatment and plasma pretreatment of goose down before padding with the water-repellent and oil-repellent finishing agent can improve the water-repellent and oil-repellent properties of the final goose down product. The formulation of the composite reagent used in the oxidation process is particularly crucial. This invention verifies the effect of combining transglutaminase with curcumin or quercetin / dihydrocurcumin. Experimental results show that transglutaminase only achieves a synergistic effect when combined with curcumin, significantly improving the WCA and OCA of the final goose down product. A larger contact angle indicates stronger water-repellent and oil-repellent properties of the goose down. This invention also verifies the effect of adding different plant extracts to the water-repellent and oil-repellent finishing agent system on the water-repellent and oil-repellent properties of the final goose down product. Experimental results show that only Lygodium japonicum-corn bran extract (methanol extraction) can significantly improve the water-repellent and oil-repellent properties of goose down.

[0053] Experiment 2: In the padding process, water-repellent and oil-repellent finishing agents with different storage conditions than those in the experimental and control groups were used, resulting in the following groups: S(2 / 4)-G (the remaining preparation methods were consistent with those of S2 / 4 group, i.e., except for the difference in the storage conditions of the water-repellent and oil-repellent finishing agent, the remaining operations were consistent with those of S2-G group and S4-G group and S4 group) and D(10-16)-G group (the remaining preparation methods were consistent with those of D(10-16) group, i.e., except for the difference in the storage conditions of the water-repellent and oil-repellent finishing agent, the remaining operations were consistent with those of D10-G group and D10 group, D11-G group and D11 group, D12-G group and D12 group, and so on). The storage conditions for the water-repellent and oil-repellent finishing agents used in the experimental, control, and blank groups were: 15-20℃, relative humidity 55-65%, and sealed storage away from light for six months. The storage conditions for the water-repellent and oil-resistant finishing agents of the above S(2 / 4)-G group and D(10-16)-G group are: 30-35℃, relative humidity 55-65%, and sealed in the dark for six months.

[0054] Then, the WCA and OCA of the goose down surface of the above experimental groups: S(2 / 4)-G group and control group: D(10-16)-G group were tested using a German Krüss DSA100 contact angle measuring instrument. The contact angle measurement range was 0~180°, and the measurement accuracy was ±0.1°. The test results are recorded in Table 2 below: Table 2. Test Data Recording Table for Water Repellency and Oil Repellency of Goose Down ; Experimental Conclusion: Based on the data analysis in Table 2, it can be seen that the water-repellent and oil-repellent finishing agent prepared by this invention has good thermal stability. After being stored at 30-35℃ for 6 months, the final goose down products still maintain a high level of water-repellent and oil-repellent effect. This indicates that the water-repellent and oil-repellent finishing agent has high thermal stability. In actual production, this beneficial effect can reduce the requirements for storage conditions, allowing companies to save on storage and transportation costs. Further analysis revealed that the extract of Lygodium japonicum and corn bran (methanol extraction) plays a key role in improving the thermal stability of the water-repellent and oil-repellent finishing agent.

[0055] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for preparing water-repellent and oil-repellent goose down, characterized in that: Specifically, the following steps are included: Step 1: Using degreased, cleaned and dried goose down as raw material, the goose down is oxidized using a compound reagent. After washing and dehydration, oxidized goose down is obtained. The raw materials for preparing the compound reagent include, by weight, 52-60 parts of dilute acetic acid, 20-25 parts of transglutaminase, 10-16 parts of curcumin, and 10-15 parts of fatty alcohol polyoxyethylene ether. Step 2: The oxidized goose down obtained in Step 1 is subjected to plasma pretreatment to obtain pretreated goose down; Step 3: Apply a water-repellent and oil-repellent finishing agent to the pretreated goose down for padding treatment; wherein, the raw materials for preparing the water-repellent and oil-repellent finishing agent, by weight, include 30-35 parts rice bran wax, 18-24 parts amino-terminated silicone oil, 15-20 parts nano silica aqueous solution, 12-18 parts plant extract, 7-12 parts hydroxypropyl chitosan, 3-5 parts silane coupling agent, and 3-5 parts surfactant; Step 4: After the goose down has been impregnated and padded in Step 3, it is dried to obtain water-repellent and oil-resistant goose down.

2. The method for preparing water-repellent and oil-resistant goose down according to claim 1, characterized in that: The amount of the compound reagent used is 3-8 wt% of goose down.

3. The method for preparing water-repellent and oil-resistant goose down according to claim 2, characterized in that: In step one, the oxidation treatment specifically involves first mixing transglutaminase, curcumin, and fatty alcohol polyoxyethylene ether in water, and then soaking the goose down at 45-60°C for 40-60 minutes. Next, dilute acetic acid with a mass concentration of 6-15% is added, and the mixture is continuously soaked at 5-10 rpm during the process. The mass ratio of goose down to water is 1:25-30.

4. The method for preparing water-repellent and oil-resistant goose down according to claim 1, characterized in that: In step two, the plasma pretreatment involves using nitrogen low-temperature plasma to pretreat the goose down, with a power of 45-65W, a pressure of 20-30Pa, a time of 1-3 minutes, and a temperature of 30-40℃.

5. The method for preparing water-repellent and oil-resistant goose down according to claim 1, characterized in that: The amount of the water-repellent and oil-resistant finishing agent used is 4-10 wt% of the goose down.

6. The method for preparing water-repellent and oil-resistant goose down according to claim 5, characterized in that: In step three, the padding process specifically involves adding a water-repellent and oil-repellent finishing agent to deionized water, heating and maintaining the temperature to 65-90°C to obtain a water-repellent and oil-repellent finishing solution, and then using this water-repellent and oil-repellent finishing solution to perform two dips and two padding processes on the goose down, with a bath ratio of 1:20-25 and a padding rate of 65%-80%.

7. The method for preparing water-repellent and oil-resistant goose down according to claim 6, characterized in that: The mass concentration of the nano-silica aqueous solution is 20-25%; The silane coupling agent includes at least one of silane coupling agent KH550 and silane coupling agent KH590.

8. The method for preparing water-repellent and oil-resistant goose down according to claim 6, characterized in that: The surfactant includes at least one of polyoxyethylene fatty acids and alkyl polysaccharides.

9. The method for preparing water-repellent and oil-resistant goose down according to claim 6, characterized in that: The plant extract is Lygodium japonicum-corn bran extract. The specific method for obtaining it is as follows: weigh the Lygodium japonicum-corn bran powder, add it to a methanol solution with a mass concentration of 60-75% at a mass ratio of 1:6-10, heat and reflux for 2-3 hours, cool and filter with a microporous membrane and store for later use.

10. A type of water-repellent and oil-repellent goose down, characterized in that: It is prepared by any of the preparation methods described in 1-9 above.