Processing method and processing system of waterproof down feather
By using atomized spraying and a double-layer hydrophobic protective film, the problems of complexity and inefficiency in existing down waterproofing treatments have been solved, achieving a highly efficient and environmentally friendly waterproofing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUIGANG CITY LINDA DOWN PROD CO LTD
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-15
AI Technical Summary
Existing waterproofing processes for down feathers are complex and inefficient, and some waterproofing agents are not environmentally friendly. The complex process makes it difficult to achieve high-efficiency waterproofing performance.
Waterproofing is achieved through atomized spraying, using an improved waterproofing liquid formula. A double-layer hydrophobic protective film is constructed on the down surface through two sprays. Combined with a specialized processing system, the process is simplified and spraying efficiency is improved.
The process steps were simplified, the processing time was shortened, the waterproofing performance was improved, energy consumption was reduced, and environmentally friendly waterproofing agents were used, achieving highly efficient waterproofing treatment.
Smart Images
Figure CN122039451A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of waterproof down processing technology, specifically relating to a processing method and system for waterproof down. Background Technology
[0002] Down is widely used in outdoor clothing, bedding, and other fields due to its lightweight, fluffy, and warm properties. However, natural down is highly hydrophilic, easily absorbing moisture and clumping in humid environments, resulting in decreased loft and a sharp decline in warmth. Therefore, down raw materials are usually waterproofed by applying a hydrophobic finishing agent to the surface of the down to form a waterproof film. However, existing down waterproofing processes suffer from problems such as complex procedures, low efficiency, and some waterproofing agents being environmentally unfriendly. Furthermore, most processes employ water immersion and rolling, using a physicochemical synergy of forced impregnation and subsequent mechanical rolling to uniformly and firmly apply the waterproof finishing agent to the surface of the down fibers, giving the down hydrophobic properties. Some processing devices immerse the down in an impregnation tank containing a waterproofing solution, resulting in the down being dispersed throughout the tank. This necessitates post-treatment separation and filtration of the waterproofing solution from the down, a complex process that hinders centralized wetting and discharge of the down, further impacting the efficiency of the down waterproofing process. Summary of the Invention
[0003] To address the aforementioned shortcomings, this invention discloses a processing method and system for waterproof down. On one hand, it employs an atomized spraying method to waterproof the down raw material, and improves the waterproofing liquid formula to allow for waterproofing in just two spray coats, simplifying the process and shortening processing time. On the other hand, it improves the spraying device within the processing system, facilitating concentrated wetting and discharge of the down, thereby increasing work efficiency.
[0004] This invention is achieved using the following technical solution: A method for processing waterproof down, comprising the following steps: S1. Weigh the raw materials according to the following weight proportions: 40-60 parts of waterborne polyurethane emulsion, 10-20 parts of polyether polyol, 3-6 parts of epoxy crosslinking agent, 2-5 parts of chitosan quaternary ammonium salt, 1-3 parts of nanocellulose whiskers, 0.5-1.5 parts of wetting agent, and 800-1000 parts of water. Add polyether polyol to the waterborne polyurethane emulsion and stir to obtain mixture A. Then take the epoxy crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture A. Then take the chitosan quaternary ammonium salt, dissolve it in water to obtain a solution with a concentration of 5-10%, and add it to mixture A. Next, take the nanocellulose whiskers, disperse them in water to obtain a solution with a concentration of 1-2%, and add it to mixture A. Then add the wetting agent and the remaining water, and add acetic acid to adjust the pH to 5.0-5.5. Then continue stirring for 15-30 minutes and let it stand to obtain a first-grade waterproof spray liquid. S2. Weigh the raw materials according to the following weight proportions: 300-400 parts of sodium polythiooctanoate solution, 10-20 parts of long-chain alkyl silicone oil, 3-7 parts of carnauba wax, 3-6 parts of blocked isocyanate crosslinking agent, 0.5-1.5 parts of wetting agent, and 600-800 parts of water. Add long-chain alkyl silicone oil to the sodium polythiooctanoate solution and stir to obtain mixture B. Then, dissolve carnauba wax in water to obtain a solution with a concentration of 3-5% and add it to mixture B. Next, take the blocked isocyanate crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture B. Then, add the wetting agent and the remaining water, and continue stirring for 15-30 minutes. After standing, obtain the secondary waterproof spray liquid. S3. Take the degreased and dehydrated down and spray it with the first-level waterproof spray liquid obtained in step S1. The spraying time is 10-15 minutes and the atomization pressure is 0.4-0.6 MPa. After spraying, place the down in a 75-85℃ pre-drying treatment for 3-5 minutes. S4. Take the down treated in step S3 and spray it with the secondary waterproofing spray liquid obtained in step S2. The spraying time is 5 to 10 minutes, the atomization pressure is 0.4 to 0.6 MPa, and the temperature of the secondary waterproofing spray liquid is 30 to 35°C. S5. Take the down treated in step S4 and cure it at 55-135℃ for 25-40 minutes. Then, place the down in a fluffing machine and treat it with cold air for 8-15 minutes. Then, let it stand in an environment of 23-27℃ and relative humidity of 60-70% for 8-16 hours to rehydrate and obtain waterproof down.
[0005] This invention uses a two-stage spraying method to treat down to achieve excellent waterproof performance. Different waterproof spraying liquids are used for the two sprayings. First, a base layer with strong adhesion is sprayed on the surface of the down, and then a top layer that can improve hydrophobicity is sprayed. The first-level waterproof spray is mainly composed of water-based polyurethane emulsion, which forms a continuous polymer film on the down surface, providing basic mechanical strength and adhesion. The added polyether polyol can absorb mechanical stress and prevent the film from becoming brittle. The added chitosan quaternary ammonium salt forms electrostatic adsorption with the down fibers, promoting uniform deposition of the spray on the down surface and improving spraying efficiency. The added nanocellulose whiskers can spontaneously bridge during film formation, preventing the polymer film from shrinking and cracking and improving the continuity of the film. The second-level waterproof spray contains sodium polythiooctanoate solution, long-chain alkyl silicone oil and carnauba wax to form a surface layer, and under the action of a blocked isocyanate crosslinking agent, it crosslinks and adheres to the underlying polymer film, eliminating the risk of interlayer peeling. The sodium polythiooctanoate contains a large number of dynamic disulfide bonds, which can be reversibly exchanged under thermal stimulation to achieve scratch self-healing. The alkyl chains in the long-chain alkyl silicone oil are oriented after film formation, forming a dense hydrophobic layer with the uniformly dispersed carnauba wax, giving the down excellent waterproof properties.
[0006] Furthermore, in step S1, the solid content of the aqueous polyurethane emulsion is 30-40%, the polyether polyol is polypropylene glycol or polyethylene glycol, the epoxy crosslinking agent is glycerol triglycidyl ether or ethylene glycol diglycidyl ether, the diameter of the nanocellulose crystals is 5-20 nm and the length is 100-500 nm, and the wetting agent is polyether-modified trisiloxane.
[0007] Furthermore, the stirring speed in step S1 is 200-300 rpm.
[0008] Furthermore, in step S2, the solid content of the sodium polythiooctanoate solution is 8-10%, and the wetting agent is polyether-modified trisiloxane.
[0009] Furthermore, the stirring speed in step S2 is 60-80 rpm.
[0010] Further, in step S5, the down treated in step S4 is cured at 95–105°C for 8–10 min, then cured at 125–135°C for 10–15 min, and then cured at 55–65°C for 8–10 min. The temperature is increased or decreased at a rate of 3–5°C / min between different temperature stages. This invention performs a short-term low-temperature pre-baking treatment after the first spraying. This removes free water, promotes the formation of a continuous nascent film, and retains some unreacted epoxy crosslinking agent, preparing for subsequent crosslinking with the surface film. Then, during the heating and curing process, a staged temperature-controlled treatment is used. In the first stage, the blocked isocyanate crosslinking agent reacts and forms a preliminary crosslink with the underlying layer. In the second stage, the temperature is increased to promote the enrichment of long-chain alkyl silicone oil on the surface and the melting and spreading of wax. In the third stage, the wax recrystallizes to form a micro-nano rough structure, improving hydrophobicity. Finally, the temperature is decreased at a suitable rate to avoid stress concentration within the film layer and the occurrence of microcracks and other defects.
[0011] A waterproof down processing system includes a primary mixing tank, a primary spraying device, a secondary mixing tank, a secondary spraying device, a pre-drying oven, a main drying oven, a fluffing machine, and a balancing chamber. The primary mixing tank is used to prepare a primary waterproof spraying liquid, the secondary mixing tank is used to prepare a secondary waterproof spraying liquid, the pre-drying oven is used for pre-drying the down, the main drying oven is used for heating and curing the down, the fluffing machine is used for fluffing the down, and the balancing chamber is used for rehumidifying the down. The primary and secondary spraying devices employ the same spraying mechanism and are used for spraying primary and secondary waterproofing liquids onto down. The spraying mechanism includes a suspension anchored and limited to the beam frame. A servo motor and several cylinders are detachably connected inside the suspension. A connecting plate structure is detachably connected to one side of the output end of each cylinder. A spray cylinder structure is located at the right end of the connecting plate structure. A separation rod structure is located at the end of the servo motor spindle. The spray cylinder structure includes a shell, a down feeding valve device, a microporous ring plate, a cavity plate, an atomizing nozzle, and a liquid delivery valve device. Down feeding valve devices are symmetrically distributed and fixedly connected to both ends of the shell. A microporous ring plate is fixedly connected to the bottom end of the shell. A cavity plate is fixedly connected to the inner wall of the shell. An atomizing nozzle is fixedly connected to the bottom end of the cavity plate. A liquid delivery valve device is fixedly connected to the inside of the right end of the cavity plate and the inside of the right end of the shell.
[0012] The spraying mechanism adopts an easy-to-assemble separation rod structure, which, together with the spray cylinder structure, forms a space for conveying and atomizing the down. The cylinder device drives the connecting plate structure and the spray cylinder structure to move upward, while the servo motor drives the separation rod structure to rotate, centrifugally throwing out the wet down, which facilitates centralized wetting and discharge of the down.
[0013] Furthermore, a separation rod structure is provided through the interior of the cylindrical shell. The separation rod structure includes a rod body, a limiting block, a connecting column structure, a connecting guide strip structure, a coaxial thread structure, a conical disc, and a locking cover. The rod body is detachably connected to the end of the servo motor spindle. The limiting block is fixedly connected to the left end of the rod body. The connecting column structure is fixedly connected to the bottom end of the rod body. The connecting guide strip structures are symmetrically distributed and fixedly connected to the left and right ends of the connecting column structure. The coaxial thread structure is fixedly connected to the bottom end of the connecting column structure. A conical disc is inserted into the outer side of the connecting column structure and the outer side of the connecting guide strip structure. A locking cover is threaded onto the outer side of the coaxial thread structure.
[0014] Furthermore, the sealing ring on the outer side of the conical surface of the conical disc abuts and limits the bottom of the microporous ring plate, and the sealing ring inside the top of the conical disc abuts and limits the lower outer side of the rod body; the rod body is smoothly polished and is fitted with ceramic bushings on its outer side and inside the top of the cylindrical shell and inside the cavity disc.
[0015] Compared with existing technologies, this technical solution has the following advantages: 1. This invention uses a spraying method to construct a double-layer hydrophobic protective film structure on the surface of down. First, a bottom layer with strong adhesion and flexibility is sprayed on the surface of down to act as anchoring and buffering. Then, a second top layer with hydrophobic and wear-resistant functions is sprayed. Gradual curing is then carried out during the curing process. Different curing stages are formed by controlling the temperature. By utilizing the spontaneous surface migration of low surface energy components in the high-temperature stage, a vertical gradient structure with hydrophobic enrichment on the surface and toughness in the inner layer is naturally formed in the single-layer coating, thereby enabling the down to obtain excellent waterproof performance.
[0016] 2. This invention uses a down-based secondary spraying process to replace the impregnation process, which simplifies the process steps and reduces processing difficulty, significantly reduces production time and energy consumption, and uses non-toxic or low-toxic and fluorine-free waterproofing agents, thus improving environmental safety.
[0017] 3. The present invention provides a specialized processing system for the processing method, which consists of a primary liquid preparation tank, a primary spraying device, a secondary liquid preparation tank, a secondary spraying device, a pre-drying oven, a main drying oven, a fluffing machine, and a balancing chamber, etc., which can realize continuous production of down waterproof spraying processing. At the same time, a spraying mechanism is set up for the secondary spraying process of down, which can quickly separate and discharge the sprayed down through an adjustable and movable spray nozzle structure and a rotating separation rod structure, simplifying the separation operation and further improving work efficiency. Attached Figure Description
[0018] Figure 1 This is a connection diagram of the processing system described in Example 5.
[0019] Figure 2 This is a schematic diagram of the overall structure of the spraying mechanism described in Example 5; Figure 3 This is a schematic diagram of the internal components of the spray cylinder structure described in Example 5; Figure 4 for Figure 2 Schematic diagram of the structure at point A in the diagram; Figure 5 for Figure 2 Schematic diagram of the structure at point B in the diagram; Figure 6 This is a schematic diagram showing the position of the connecting column structure and the connecting guide strip structure described in Example 5.
[0020] In the diagram: 1. Suspension; 2. Servo motor; 3. Cylinder assembly; 4. Connecting plate structure; 5. Spray cylinder structure; 51. Cylinder shell; 52. Down feeding valve device; 53. Microporous ring plate; 54. Chamber plate; 55. Atomizing nozzle; 56. Infusion valve device; 6. Separating rod structure; 61. Rod body; 62. Limiting block; 63. Connecting column structure; 64. Connecting guide strip structure; 65. Coaxial thread structure; 66. Conical disc; 67. Locking cover; 7. Primary mixing tank; 71. Primary spraying device; 72. Secondary mixing tank; 73. Secondary spraying device; 74. Pre-drying oven; 75. Main drying oven; 76. Fluffing machine; 77. Balance chamber. Detailed Implementation
[0021] The present invention is further illustrated by the following examples, but these are not intended to limit the invention. Specific experimental conditions and methods not specified in the following examples are generally conventional methods well known to those skilled in the art.
[0022] Example 1: A method for processing waterproof down, comprising the following steps: S1. Weigh the raw materials according to the following weight proportions: waterborne polyurethane emulsion: 45 parts, polyether polyol: 15 parts, epoxy crosslinking agent: 4 parts, chitosan quaternary ammonium salt: 3 parts, nanocellulose whiskers: 2 parts, polyether-modified trisiloxane: 0.8 parts, water: 850 parts. Add polyether polyol to the waterborne polyurethane emulsion and stir at 250 rpm to obtain mixture A. Then, take the epoxy crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture A. Then, dissolve the chitosan quaternary ammonium salt in water to obtain a 6% solution and add it to the mixture. Mix the components in mixture A, then disperse the nanocellulose whiskers in water to obtain a 1.5% solution, add it to mixture A and mix. Then add a wetting agent and the remaining water, and add acetic acid to adjust the pH to 5.2. Continue stirring for 20 minutes and let it stand to obtain a first-grade waterproof spraying liquid. The solid content of the waterborne polyurethane emulsion is 35%, the polyether polyol is polypropylene glycol, the epoxy crosslinking agent is glycerol triglycidyl ether, and the nanocellulose crystals have a diameter of 5-10 nm and a length of 100-200 nm. S2. Weigh the raw materials according to the following weight proportions: 350 parts sodium polythiooctanoate solution, 15 parts long-chain alkyl silicone oil, 4 parts carnauba wax, 4 parts blocked isocyanate crosslinking agent, 0.8 parts polyether-modified trisiloxane, and 650 parts water. Add long-chain alkyl silicone oil to the sodium polythiooctanoate solution and stir at 75 rpm to obtain mixture B. Then, dissolve carnauba wax in water to obtain a 4% solution and add it to mixture B. Next, take the blocked isocyanate crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture B. Then, add the wetting agent and the remaining water, and continue stirring for 20 minutes. After standing, obtain the secondary waterproof spray liquid. The solid content of the sodium polythiooctanoate solution is 9%. S3. Take the degreased and dehydrated down and spray it with the first-level waterproof spray liquid obtained in step S1. The spraying time is 12 minutes and the atomization pressure is 0.5 MPa. After the spraying is completed, place the down in 80℃ for pre-drying treatment for 4 minutes. S4. Take the down treated in step S3 and spray it with the secondary waterproofing spray liquid obtained in step S2. The spraying time is 6 minutes, the atomization pressure is 0.5 MPa, and the temperature of the secondary waterproofing spray liquid is 32℃. S5. Take the down treated in step S4 and cure it at 100℃ for 9 minutes, then cure it at 130℃ for 12 minutes, and then cure it at 60℃ for 9 minutes. The temperature is increased or decreased at a rate of 4℃ / min between different temperature stages. Then, place the down in a fluffing machine for cold air treatment for 10 minutes, and then let it stand in an environment of 25℃ and 65% relative humidity for 10 hours to rehydrate and obtain waterproof down.
[0023] Example 2: A method for processing waterproof down, comprising the following steps: S1. Weigh the raw materials according to the following weight proportions: 40 parts waterborne polyurethane emulsion, 10 parts polyether polyol, 3 parts epoxy crosslinking agent, 2 parts chitosan quaternary ammonium salt, 1 part nanocellulose whiskers, 0.5 parts polyether-modified trisiloxane, and 1000 parts water. Add the polyether polyol to the waterborne polyurethane emulsion and stir at 200 rpm to obtain mixture A. Then, take the epoxy crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture A. Next, dissolve the chitosan quaternary ammonium salt in water to obtain a 5% solution and add it to the mixture. Mix the components in mixture A, then disperse the nanocellulose whiskers in water to obtain a 1% solution, add it to mixture A and mix. Then add a wetting agent and the remaining water, and add acetic acid to adjust the pH to 5.0. Continue stirring for 15 minutes and let it stand to obtain a first-grade waterproof spraying liquid. The solid content of the waterborne polyurethane emulsion is 30%, the polyether polyol is polyethylene glycol, the epoxy crosslinking agent is ethylene glycol diglycidyl ether, and the nanocellulose crystals have a diameter of 15-20 nm and a length of 400-500 nm. S2. Weigh the raw materials according to the following weight proportions: 300 parts sodium polythiooctanoate solution, 10 parts long-chain alkyl silicone oil, 3 parts carnauba wax, 3 parts blocked isocyanate crosslinking agent, 0.5 parts polyether-modified trisiloxane, and 800 parts water; add long-chain alkyl silicone oil to the sodium polythiooctanoate solution and stir at 60 rpm to obtain mixture B. Then, dissolve carnauba wax in water to obtain a 3% solution and add it to mixture B. Next, take the blocked isocyanate crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture B. Then, add the wetting agent and the remaining water, and continue stirring for 15 minutes. After standing, obtain the secondary waterproof spray liquid; the solid content of the sodium polythiooctanoate solution is 8%. S3. Take the degreased and dehydrated down and spray it with the first-level waterproof spray liquid obtained in step S1. The spraying time is 10 minutes and the atomization pressure is 0.4 MPa. After the spraying is completed, place the down in a 75°C pre-drying treatment for 5 minutes. S4. Take the down treated in step S3 and spray it with the secondary waterproofing spray liquid obtained in step S2. The spraying time is 5 minutes, the atomization pressure is 0.4 MPa, and the temperature of the secondary waterproofing spray liquid is 30℃. S5. Take the down treated in step S4 and cure it at 95℃ for 10 minutes, then cure it at 125℃ for 15 minutes, and then cure it at 55℃ for 10 minutes. The temperature is increased or decreased at a rate of 3℃ / min between different temperature stages. Then, place the down in a fluffing machine for cold air treatment for 8 minutes, and then let it stand in an environment of 23℃ and 70% relative humidity for 8 hours to rehydrate and obtain waterproof down.
[0024] Example 3: A method for processing waterproof down, comprising the following steps: S1. Weigh the raw materials according to the following weight proportions: 55 parts waterborne polyurethane emulsion, 15 parts polyether polyol, 5 parts epoxy crosslinking agent, 4 parts chitosan quaternary ammonium salt, 2.5 parts nanocellulose whiskers, 1 part polyether-modified trisiloxane, and 900 parts water. Add the polyether polyol to the waterborne polyurethane emulsion and stir at 250 rpm to obtain mixture A. Then, take the epoxy crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture A. Next, dissolve the chitosan quaternary ammonium salt in water to obtain an 8% solution and add it to the mixture. Mixing is carried out in mixture A. Then, nanocellulose whiskers are dispersed in water to obtain a 1.5% solution, which is then added to mixture A and mixed. Wetting agent and the remaining water are added, and acetic acid is added to adjust the pH to 5.2. The mixture is then stirred for 20 minutes and allowed to stand to obtain a first-grade waterproof spraying liquid. The solid content of the waterborne polyurethane emulsion is 35%, the polyether polyol is polyethylene glycol, the epoxy crosslinking agent is ethylene glycol diglycidyl ether, and the nanocellulose crystals have a diameter of 5-10 nm and a length of 100-200 nm. S2. Weigh the raw materials according to the following weight proportions: 350 parts sodium polythiooctanoate solution, 15 parts long-chain alkyl silicone oil, 6 parts carnauba wax, 5 parts blocked isocyanate crosslinking agent, 1.2 parts polyether-modified trisiloxane, and 750 parts water. Add long-chain alkyl silicone oil to the sodium polythiooctanoate solution and stir at 75 rpm to obtain mixture B. Then, dissolve carnauba wax in water to obtain a 4% solution and add it to mixture B. Next, take the blocked isocyanate crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture B. Then, add the wetting agent and the remaining water, and continue stirring for 25 minutes. After standing, obtain the secondary waterproof spray liquid. The solid content of the sodium polythiooctanoate solution is 9%. S3. Take the degreased and dehydrated down and spray it with the first-level waterproof spray liquid obtained in step S1. The spraying time is 12 minutes and the atomization pressure is 0.5 MPa. After the spraying is completed, place the down in a 78°C pre-drying treatment for 4 minutes. S4. Take the down treated in step S3 and spray it with the secondary waterproofing spray liquid obtained in step S2. The spraying time is 8 minutes, the atomization pressure is 0.5 MPa, and the temperature of the secondary waterproofing spray liquid is 34℃. S5. Take the down treated in step S4 and cure it at 102℃ for 9 minutes, then cure it at 132℃ for 12 minutes, and then cure it at 62℃ for 9 minutes. The temperature is increased or decreased at a rate of 4℃ / min between different temperature stages. Then, place the down in a fluffing machine for cold air treatment for 14 minutes, and then let it stand in an environment of 26℃ and 65% relative humidity for 12 hours to rehydrate and obtain waterproof down.
[0025] Example 4: A method for processing waterproof down, comprising the following steps: S1. Weigh the raw materials according to the following parts by weight: 60 parts waterborne polyurethane emulsion, 20 parts polyether polyol, 6 parts epoxy crosslinking agent, 5 parts chitosan quaternary ammonium salt, 3 parts nanocellulose whiskers, 1.5 parts polyether-modified trisiloxane, and 800 parts water. Add the polyether polyol to the waterborne polyurethane emulsion and stir at 300 rpm to obtain mixture A. Then, take the epoxy crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture A. Then, dissolve the chitosan quaternary ammonium salt in water to obtain a 10% solution and add it to the mixture. Mixing is carried out in mixture A. Then, nanocellulose whiskers are dispersed in water to obtain a 2% solution, which is then added to mixture A and mixed. Wetting agent and the remaining water are added, and acetic acid is added to adjust the pH to 5.5. The mixture is then stirred for 30 minutes and allowed to stand to obtain a first-grade waterproof spraying liquid. The solid content of the waterborne polyurethane emulsion is 40%, the polyether polyol is polypropylene glycol, the epoxy crosslinking agent is glycerol triglycidyl ether, and the nanocellulose crystals have a diameter of 10-15 nm and a length of 200-300 nm. S2. Weigh the raw materials according to the following weight proportions: 400 parts sodium polythiooctanoate solution, 20 parts long-chain alkyl silicone oil, 7 parts carnauba wax, 6 parts blocked isocyanate crosslinking agent, 1.5 parts polyether-modified trisiloxane, and 600 parts water. Add the long-chain alkyl silicone oil to the sodium polythiooctanoate solution and stir at 80 rpm to obtain mixture B. Then, dissolve the carnauba wax in water to obtain a 5% solution and add it to mixture B. Next, take the blocked isocyanate crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture B. Then, add the wetting agent and the remaining water, and continue stirring for 30 minutes. After standing, obtain the secondary waterproof spray liquid. The solid content of the sodium polythiooctanoate solution is 10%. S3. Take the degreased and dehydrated down and spray it with the first-level waterproof spray liquid obtained in step S1. The spraying time is 15 minutes and the atomization pressure is 0.6 MPa. After the spraying is completed, place the down in 85℃ for pre-drying for 3 minutes. S4. Take the down treated in step S3 and spray it with the secondary waterproofing spray liquid obtained in step S2. The spraying time is 10 minutes, the atomization pressure is 0.6 MPa, and the temperature of the secondary waterproofing spray liquid is 35℃. S5. Take the down treated in step S4 and cure it at 105℃ for 8 minutes, then cure it at 135℃ for 10 minutes, and then cure it at 65℃ for 8 minutes. The temperature is increased or decreased at a rate of 5℃ / min between different temperature stages. Then, place the down in a fluffing machine for cold air treatment for 15 minutes, and then let it stand in an environment of 27℃ and 60% relative humidity for 16 hours to rehydrate and obtain waterproof down.
[0026] Example 5: Figures 1-6 As shown, a waterproof down processing system includes a primary liquid preparation tank 7, a primary spraying device 71, a secondary liquid preparation tank 72, a secondary spraying device 73, a pre-drying oven 74, a main drying oven 75, a fluffing machine 76, and a balancing chamber 77. The primary liquid preparation tank 7 is used to prepare the primary waterproof spraying liquid, the secondary liquid preparation tank 72 is used to prepare the secondary waterproof spraying liquid, the pre-drying oven 74 is used for pre-drying the down, the main drying oven 75 is used for heating and curing the down, the fluffing machine 76 is used for fluffing the down, and the balancing chamber 77 is used for rehumidifying the down. The first-stage spraying device 71 and the second-stage spraying device 73 adopt the same spraying mechanism and are applied to spraying first-stage and second-stage waterproofing liquids on down. The spraying mechanism includes a suspension 1 that is anchored and limited to the beam frame. A servo motor 2 and two cylinder devices 3 are detachably connected inside the suspension 1. A connecting plate structure 4 is detachably connected to one side of the output end of the cylinder device 3. A spray cylinder structure 5 is provided at the right end of the connecting plate structure 4. A separation rod structure 6 is provided at the end of the main shaft of the servo motor 2. The spray cylinder structure 5 includes a cylinder shell 51, a down feeding valve device 52, a microporous ring plate 53, a cavity plate 54, an atomizing nozzle 55, and a liquid delivery valve device 56. The down feeding valve devices 52, which are symmetrically distributed, are fixedly connected to the left and right ends of the cylinder shell 51. The microporous ring plate 53 is fixedly connected to the bottom end of the cylinder shell 51. The cavity plate 54 is fixedly connected to the inner wall of the cylinder shell 51. The atomizing nozzle 55 is fixedly connected to the bottom end of the cavity plate 54. The liquid delivery valve device 56 is fixedly connected to the inside of the right end of the cavity plate 54 and the inside of the right end of the cylinder shell 51, thereby forming an integrated spray cylinder structure 5. A separation rod structure 6 is installed through the interior of the cylindrical shell 51. The separation rod structure 6 includes a rod body 61, a limiting block 62, a connecting column structure 63, a connecting guide bar structure 64, a coaxial thread structure 65, a conical disc 66, and a locking cover 67. The rod body 61 is detachably connected to the end of the main shaft of the servo motor 2. The limiting block 62 is fixedly connected to the left end of the rod body 61. The connecting column structure 63 is fixedly connected to the bottom end of the rod body 61. The connecting guide bar structures 64 are symmetrically distributed and fixedly connected to the left and right ends of the connecting column structure 63. The coaxial thread structure 65 is fixedly connected to the bottom end of the connecting column structure 63. The conical disc 66 is inserted into the outer side of the connecting column structure 63 and the outer side of the connecting guide bar structure 64. The locking cover 67 is threaded onto the outer side of the coaxial thread structure 65, thereby forming a combined installation structure of the separation rod structure 6. The sealing ring on the outer side of the conical surface of the conical disk 66 abuts against and limits the bottom of the microporous ring plate 53, and the sealing ring inside the top of the conical disk 66 abuts against and limits the lower outer side of the rod body 61, thereby forming a sealed installation structure; the rod body 61 is smooth and polished, and its outer side is inserted into the ceramic bushing inside the top of the cylindrical shell 51 and the ceramic bushing inside the cavity disk 54, which can reduce the rotational friction loss of the rod body 61.
[0027] The waterproof down processing system described in this embodiment can be implemented according to the processing method described in Embodiment 1. First, the raw materials are added to the primary mixing tank 7 and the secondary mixing tank 72 in sequence and stirred to prepare the primary waterproof spraying liquid and the secondary waterproof spraying liquid. Then, down is added to the primary spraying device 71 and the primary waterproof spraying liquid is sent to the primary spraying device 71 for spraying through a pump and hose. Then, the down is sent to the pre-drying oven 74 for pre-drying treatment and then sent to the secondary spraying device 73. The secondary waterproof spraying liquid is sent to the secondary spraying device 73 for spraying through a pump and hose. Then, the down is sent to the main drying oven 75 for curing treatment. Then, the down is sent to the fluffing machine 76 for fluffing treatment. Then, after adjusting the indoor temperature and humidity to the working range in the balancing chamber, the down is sent to the balancing chamber 77 for resting and re-moistening treatment. After the re-moistening treatment, the waterproof down is obtained.
[0028] The equipment in the processing system can be controlled by an external PLC controller and powered by an external power module. Before the primary spraying device 71 and the secondary spraying device 73 operate, the suspension 1 should be anchored and limited to the workshop beam frame through an internal through-hole. The ceramic bushings inside the top of the smooth-polished rod 61 and the top of the cylinder shell 51, as well as the ceramic bushing inside the cavity disc 54, are inserted into the outer side. A conical disc 66 is inserted into the outer side of the connecting column structure 63 and the outer side of the connecting guide strip structure 64. A sealing ring inside the top of the conical disc 66 abuts against the lower outer side of the rod 61 for limitation. A locking cap 67 is threaded onto the outer side of the coaxial threaded structure 65, ensuring that the sealing ring on the outer side of the conical surface of the conical disc 66 abuts against the bottom of the microporous ring plate 53 for limitation. The down feeding valve device 52 and the liquid infusion valve device 56 are both electrically controlled one-way valves.
[0029] One end of the down feeding valve device 52 is sealed and connected to the external positive pressure pneumatic conveying system pipeline, and the other end of the liquid infusion valve device 56 is sealed and connected to the waterproof preparation liquid system pipeline pumped from the impregnation tank. When the valve of the down feeding valve device 52 is opened, the down is conveyed and processed by the external positive pressure pneumatic conveying system. It is blown obliquely into the cylinder shell 51 from the storage tank through a flexible pipe via the down feeding valve device 52. The waterproof preparation liquid pumped from the impregnation tank enters the cavity plate 54 through the liquid infusion valve device 56 and is atomized and sprayed out through the atomizing nozzle 55 to atomize and moisten the down inside the cylinder shell 51. The moistened down is deposited on the outer side of the conical surface of the conical plate 66, and excess waterproof spray is removed. The coating is discharged through the tiny through-holes of the microporous ring plate 53. Then, the cylinder device 3 drives the connecting plate structure 4 and the spray cylinder structure 5 to move upward. The servo motor 2 starts and drives the separation rod structure 6 to rotate, so that the wet down deposited on the outer side of the cone surface of the cone disk 66 is centrifugally thrown out. In conjunction with the subsequent collection equipment and conveyor belt device, the subsequent pressing and drainage treatment is carried out. The device adopts the easily assembled separation rod structure 6, which, together with the spray cylinder structure 5, forms a space for conveying and atomizing and wetting the down. The cylinder device 3 drives the connecting plate structure 4 and the spray cylinder structure 5 to move upward, and at the same time, the servo motor 2 drives the separation rod structure 6 to rotate, which facilitates the centrifugal throwing out of the wet down.
[0030] Experimental Example: Waterproof down was prepared according to the processing methods described in Examples 1-4. The acidity and moisture content of the obtained waterproof down were tested according to the method described in GB / T10288-2016. The specific results are shown in Table 1. A commercially available fluorine-free down waterproofing agent was used as a control for immersion treatment for 30 minutes. As can be seen from the data in Table 1, the waterproof down prepared by the method of this invention has better waterproof performance.
[0031] Table 1 Test Results of Waterproof Down Feathers
[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A method for processing waterproof down, characterized in that: Includes the following steps: S1. Weigh the raw materials according to the following weight proportions: 40-60 parts of waterborne polyurethane emulsion, 10-20 parts of polyether polyol, 3-6 parts of epoxy crosslinking agent, 2-5 parts of chitosan quaternary ammonium salt, 1-3 parts of nanocellulose whiskers, 0.5-1.5 parts of wetting agent, and 800-1000 parts of water. Add polyether polyol to the waterborne polyurethane emulsion and stir to obtain mixture A. Then take the epoxy crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture A. Then take the chitosan quaternary ammonium salt, dissolve it in water to obtain a solution with a concentration of 5-10%, and add it to mixture A. Next, take the nanocellulose whiskers, disperse them in water to obtain a solution with a concentration of 1-2%, and add it to mixture A. Then add the wetting agent and the remaining water, and add acetic acid to adjust the pH to 5.0-5.
5. Then continue stirring for 15-30 minutes and let it stand to obtain a first-grade waterproof spray liquid. S2. Weigh the raw materials according to the following weight proportions: 300-400 parts of sodium polythiooctanoate solution, 10-20 parts of long-chain alkyl silicone oil, 3-7 parts of carnauba wax, 3-6 parts of blocked isocyanate crosslinking agent, 0.5-1.5 parts of wetting agent, and 600-800 parts of water. Add long-chain alkyl silicone oil to the sodium polythiooctanoate solution and stir to obtain mixture B. Then, dissolve carnauba wax in water to obtain a solution with a concentration of 3-5% and add it to mixture B. Next, take the blocked isocyanate crosslinking agent, dilute it with an equal amount of water, and add it dropwise to mixture B. Then, add the wetting agent and the remaining water, and continue stirring for 15-30 minutes. After standing, obtain the secondary waterproof spray liquid. S3. Take the degreased and dehydrated down and spray it with the first-level waterproof spray liquid obtained in step S1. The spraying time is 10-15 minutes and the atomization pressure is 0.4-0.6 MPa. After spraying, place the down in a 75-85℃ pre-drying treatment for 3-5 minutes. S4. Take the down treated in step S3 and spray it with the secondary waterproofing spray liquid obtained in step S2. The spraying time is 5 to 10 minutes, the atomization pressure is 0.4 to 0.6 MPa, and the temperature of the secondary waterproofing spray liquid is 30 to 35°C. S5. Take the down treated in step S4 and cure it at 55-135℃ for 25-40 minutes. Then, place the down in a fluffing machine and treat it with cold air for 8-15 minutes. Then, let it stand in an environment of 23-27℃ and relative humidity of 60-70% for 8-16 hours to rehydrate and obtain waterproof down.
2. The processing method for waterproof down according to claim 1, characterized in that: In step S1, the solid content of the aqueous polyurethane emulsion is 30-40%, the polyether polyol is polypropylene glycol or polyethylene glycol, the epoxy crosslinking agent is glycerol triglycidyl ether or ethylene glycol diglycidyl ether, the diameter of the nanocellulose crystals is 5-20 nm and the length is 100-500 nm, and the wetting agent is polyether-modified trisiloxane.
3. The processing method for waterproof down according to claim 1, characterized in that: The stirring speed in step S1 is 200-300 rpm.
4. The processing method for waterproof down according to claim 1, characterized in that: In step S2, the solid content of the sodium polythiooctanoate solution is 8-10%, and the wetting agent is polyether-modified trisiloxane.
5. The processing method for waterproof down according to claim 1, characterized in that: The stirring speed in step S2 is 60-80 rpm.
6. The processing method for waterproof down according to claim 1, characterized in that: In step S5, the down treated in step S4 is cured at 95-105℃ for 8-10 minutes, then cured at 125-135℃ for 10-15 minutes, and then cured at 55-65℃ for 8-10 minutes. The temperature is increased or decreased at a rate of 3-5℃ / min between different temperature stages.
7. A waterproof down processing system, applied to the processing method described in any one of claims 1 to 6, characterized in that: The processing system includes a primary liquid preparation tank (7), a primary spraying device (71), a secondary liquid preparation tank (72), a secondary spraying device (73), a pre-drying oven (74), a main drying oven (75), a fluffing machine (76), and a balancing chamber (77). The primary liquid preparation tank (7) is used to prepare the primary waterproof spraying liquid, the secondary liquid preparation tank (72) is used to prepare the secondary waterproof spraying liquid, the pre-drying oven (74) is used for the pre-drying treatment of down, the main drying oven (75) is used for the heating and curing treatment of down, the fluffing machine (76) is used for the fluffing treatment of down, and the balancing chamber (77) is used for the re-moistening treatment of down. The first-stage spraying device (71) and the second-stage spraying device (73) adopt the same spraying mechanism and are used for spraying first-stage and second-stage waterproof spraying liquids on down. The spraying mechanism includes a suspension (1) that is anchored and limited to the beam frame. The suspension (1) is detachably connected to a servo motor (2) and several cylinder devices (3). A connecting plate structure (4) is detachably connected to one side of the output end of the cylinder device (3). A spraying cylinder structure (5) is provided at the right end of the connecting plate structure (4). A separation rod structure (6) is provided at the end of the main shaft of the servo motor (2). The spraying cylinder structure (5) 5) Includes a cylindrical shell (51), a down feeding valve device (52), a microporous ring plate (53), a cavity plate (54), an atomizing nozzle (55), and an infusion valve device (56). The cylindrical shell (51) is fixedly connected to the left and right ends with symmetrically distributed down feeding valve devices (52). The bottom end of the cylindrical shell (51) is fixedly connected to a microporous ring plate (53). The inner wall of the cylindrical shell (51) is fixedly connected to a cavity plate (54). The bottom end of the cavity plate (54) is fixedly connected to an atomizing nozzle (55). The right end of the cavity plate (54) and the right end of the cylindrical shell (51) are fixedly connected to an infusion valve device (56).
8. The waterproof down processing system according to claim 7, characterized in that: The separation rod structure (6) is installed through the inside of the cylindrical shell (51). The separation rod structure (6) includes a rod body (61), a limiting block (62), a connecting column structure (63), a connecting guide bar structure (64), a coaxial thread structure (65), a conical disc (66), and a locking cover (67). The rod body (61) is detachably connected to the end of the main shaft of the servo motor (2). The limiting block (62) is fixedly connected to the left end of the rod body (61). The connecting column structure (63) is fixedly connected to the bottom end of the rod body (61). The connecting guide bar structures (64) are symmetrically distributed and fixedly connected to the left and right ends of the connecting column structure (63). The coaxial thread structure (65) is fixedly connected to the bottom end of the connecting column structure (63). The conical disc (66) is inserted on the outside of the connecting column structure (63) and the outside of the connecting guide bar structure (64). The locking cover (67) is threaded on the outside of the coaxial thread structure (65).
9. The waterproof down processing system according to claim 8, characterized in that: The sealing ring on the outer side of the conical surface of the conical disc (66) abuts against the bottom of the microporous ring plate (53) and limits its position. The sealing ring inside the top of the conical disc (66) abuts against the lower outer side of the rod body (61) and limits its position. The rod body (61) is smooth and polished, and its outer side is inserted into the ceramic bushing inside the top of the cylindrical shell (51) and the ceramic bushing inside the cavity disc (54).