PTFE coated down jacket fabric with nano silver ion layer and preparation method thereof

Abstract

This invention relates to a PTFE-coated down jacket fabric with a nano-silver ion layer and its preparation method. The fabric includes a base layer, on which a modified nano-silver ion layer and a PTFE coating layer are sequentially disposed. The modified nano-silver ion layer is formed by premixing nano-silver particles with an eggplant hypocotyl extract, treating with microwave irradiation, adding a polyurethane adhesive, and stirring with distilled water to obtain a coating, which is then applied to the base layer surface. This invention improves the flowability and viscosity of the polyurethane adhesive by treating the eggplant hypocotyl extract and nano-silver particles with microwave irradiation before mixing them with the polyurethane adhesive. This ensures uniform dispersion of the coating on the base layer surface. Combined with the increased viscosity, this enhances the adhesion between the PTFE coating layer and the base layer, preventing the PTFE coating layer from easily detaching or separating even after multiple washes, resulting in stable adhesion without affecting the breathability of the prepared down jacket fabric.

Description

Technical Field

[0001] This invention belongs to the field of down jacket fabric technology, specifically relating to a PTFE-coated down jacket fabric with a nano silver ion layer and its preparation method. Background Technology

[0002] Down jackets are an important part of winter clothing for keeping warm. They are mainly composed of inner and outer fabrics and down filling the space between them. The reason they keep warm is mainly due to the loft of the down and the windproof and insulating properties of the inner and outer fabrics. Ordinary fabrics have poor windproof and insulating effects, so a PTFE (polytetrafluoroethylene) composite fabric has been developed. PTFE composite fabric is a functional fabric with waterproof, breathable, windproof and insulating properties, made by bonding a PTFE clothing film to the surface of ordinary fabric using a special process.

[0003] In existing technologies, when PTFE clothing films are laminated with ordinary fabrics, adhesives are used for hot-pressing, with polyurethane adhesives being commonly used. However, after PTFE clothing films and ordinary fabrics are bonded with polyurethane adhesives, they are prone to peeling and separation after washing, indicating poor bonding stability. To address these issues, we propose a PTFE-coated down jacket fabric with a nano-silver ion layer and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a PTFE-coated down jacket fabric with a nano silver ion layer and a preparation method thereon in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A PTFE-coated down jacket fabric with a nano silver ion layer includes a base layer, wherein a modified nano silver ion layer and a PTFE coating layer are sequentially disposed on the surface of the base layer.

[0007] The modified nano-silver ion layer is formed by premixing nano-silver particles with eggplant hypocotyl extract, treating with microwave irradiation, adding polyurethane adhesive and distilled water, and stirring to obtain a coating. The coating is then applied to the surface of the substrate.

[0008] As a further optimization of the present invention, the raw materials for preparing the modified nano-silver ion layer, by weight, include 15-20 parts of nano-silver particles, 35-42 parts of eggplant embryo extract, 18-22 parts of polyurethane adhesive, and 20-30 parts of distilled water.

[0009] A method for preparing a PTFE-coated down jacket fabric with a nano-silver ion layer, the specific steps of which are as follows:

[0010] S1. The nano-silver particles and eggplant hypocotyl extract were thoroughly mixed and then subjected to microwave irradiation to obtain a premixed system.

[0011] S2. After mixing the polyurethane adhesive with distilled water evenly, add it to the premixed system and heat and keep it warm to obtain the coating.

[0012] S3. Apply the coating evenly to the base surface, lay the PTFE film flat on the coating surface, flip it so that the PTFE film is on the bottom and the base surface is on top, let it stand for 8-15 minutes and then perform the first hot pressing. After cooling down, flip it so that the base surface is on the bottom and the PTFE film is on top and perform the second hot pressing. After cooling down, the down jacket fabric is obtained.

[0013] As a further optimization of the present invention, in step S1, the method for obtaining the eggplant hypocotyl extract is as follows: freshly harvested mature eggplant hypocotyls are ground and pulverized, then soaked in 75% medical ethanol solution and water for 4-7 hours, filtered, and allowed to stand at 5-10℃ for 12-15 hours. The supernatant is removed, the precipitate is collected, and the precipitate is dried to obtain the eggplant hypocotyl extract.

[0014] As a further optimization of the present invention, in step S1, the microwave irradiation power is 200-300W, the microwave irradiation time is 6-10min, and the microwave irradiation temperature is 55-65℃.

[0015] As a further optimization of the present invention, in step S2, the heating and heat preservation temperature is 60-70℃.

[0016] As a further optimization of the present invention, in step S3, the coating amount is 140-160 g / m2.

[0017] As a further optimization of the present invention, in step S3, the first hot pressing pressure is 2-4 MPa, the first hot pressing temperature is 150-160℃, the second hot pressing pressure is 10-14 MPa, and the second hot pressing temperature is 120-130℃.

[0018] The beneficial effects of this invention are as follows:

[0019] 1) This invention improves the fluidity and viscosity of polyurethane adhesive by treating eggplant hypocotyl extract and nano-silver particles with microwave irradiation and then mixing them with polyurethane adhesive. This allows the coating to be evenly dispersed after being applied to the substrate surface. Combined with the improved viscosity, this enhances the adhesion between the PTFE coating layer and the substrate, making it less likely to fall off or separate after multiple washes, and ensuring stable adhesion.

[0020] 2) In this invention, after microwave treatment of nano-silver particles and eggplant hypocotyl extract and mixing with polyurethane adhesive, the fluidity and viscosity of polyurethane adhesive are improved without affecting the breathability of the prepared down jacket fabric.

[0021] 3) In the hot-pressing process of this invention, a coating is applied to the base layer, and the PTFE membrane is placed on the coating. Then, the membrane is flipped over so that the PTFE membrane is below and the base layer is above. After standing, the first hot-pressing and cooling are performed. The membrane is flipped over again so that the PTFE membrane is above and the second hot-pressing and cooling are performed. This allows some of the coating on the base layer to penetrate into the microporous structure of the PTFE membrane. The first and second hot-pressing processes in sequence can form a mesh-like, porous structure between the coating and the inner wall of the microporous structure of the PTFE membrane. This allows the membrane to maintain good breathability while also providing good adhesion to down jacket fabric. Detailed Implementation

[0022] 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.

[0023] I. Materials

[0024] 1. Base layer: The plain weave fabric used for the base layer contains 45% cotton fiber, 25% bamboo fiber, and 30% viscose fiber. The warp density is 70 threads / cm, and the weft density is 75 threads / cm.

[0025] 2. The polyurethane adhesive, nano silver particles, PTFE coating layer, and distilled water are all commercially available products;

[0026] 3. Eggplant hypocotyl extract: Freshly harvested mature eggplant hypocotyls (25±2cm in length) were ground and pulverized, then soaked in 75% medical ethanol solution and water for 6 hours. The mass ratio of water to 75% medical ethanol solution was 1:0.4. After filtration, the mixture was allowed to stand at 8°C for 15 hours. The supernatant was removed, and the precipitate was collected. The precipitate was dried to obtain eggplant hypocotyl extract.

[0027] II. Methods

[0028] 2.1 To verify the effects of different components of the modified nano-silver ion layer on the performance of down jacket fabric, Examples 1-3, Comparative Examples 1-2, and a blank group were set up, as detailed below:

[0029] Example 1

[0030] A PTFE-coated down jacket fabric with a nano silver ion layer includes a base layer, wherein a modified nano silver ion layer and a PTFE coating layer are sequentially disposed on the surface of the base layer.

[0031] The raw materials for preparing the modified silver nanoparticle layer include silver nanoparticles, eggplant hypocotyl extract, polyurethane adhesive, and distilled water.

[0032] A method for preparing a PTFE-coated down jacket fabric with a nano-silver ion layer, the specific steps of which are as follows:

[0033] S1. The nano-silver particles and eggplant hypocotyl extract were thoroughly mixed and then subjected to microwave irradiation to obtain a premixed system.

[0034] S2. After mixing the polyurethane adhesive with distilled water evenly, add it to the premixed system and heat and keep it warm to obtain the coating.

[0035] S3. Apply the coating evenly to the base surface, lay the PTFE film flat on the coating surface, flip it so that the PTFE film is on the bottom and the base surface is on top, let it stand, and then perform the first hot pressing. After cooling down, flip it so that the base surface is on the bottom and the PTFE film is on top, and then perform the second hot pressing. After cooling down, the down jacket fabric is obtained.

[0036] The component formulation of the raw materials for preparing the modified nano-silver ion layer and the preparation process parameters of the down jacket fabric are shown in Table 1:

[0037] Table 1

[0038]

[0039]

[0040] Comparative Example 1

[0041] A PTFE-coated down jacket fabric with a nano-silver ion layer differs from Example 2 in that, in this comparative example, the raw materials for preparing the modified nano-silver ion layer include nano-silver particles, guar gum, polyurethane adhesive, and distilled water.

[0042] Everything else is consistent with Example 2.

[0043] Comparative Example 2

[0044] A PTFE-coated down jacket fabric with a nano-silver ion layer differs from Example 2 in that, in this comparative example, the raw materials for preparing the modified nano-silver ion layer include nano-silver particles, gum arabic, polyurethane adhesive, and distilled water.

[0045] The rest remains the same as in Example 2.

[0046] Blank group

[0047] A PTFE-coated down jacket fabric with a nano silver ion layer includes a base layer, wherein a nano silver ion layer and a PTFE coating layer are sequentially disposed on the surface of the base layer.

[0048] The raw materials for preparing the nano-silver ion layer include 17 parts of nano-silver particles, 20 parts of polyurethane adhesive, and 63 parts of distilled water.

[0049] A method for preparing a PTFE-coated down jacket fabric with a nano-silver ion layer, the specific steps of which are as follows:

[0050] S1. Mix nano-silver particles, polyurethane adhesive, and distilled water evenly, and then heat and keep warm to obtain a coating.

[0051] S2. Apply the coating evenly to the base surface, lay the PTFE film flat on the coating surface, flip it so that the PTFE film is on the bottom and the base surface is on top, let it stand, and then perform the first hot pressing. After cooling down, flip it so that the base surface is on the bottom and the PTFE film is on top, and then perform the second hot pressing. After cooling down, the down jacket fabric is obtained.

[0052] Experimental verification:

[0053] I. Adhesion Performance Test of Down Jacket Fabric

[0054] Adhesion performance tests were conducted on the down jacket fabrics produced according to Examples 1-3, Comparative Examples 1-2, and the blank group described above.

[0055] The adhesive performance test was conducted according to "FZ / T-80007.1-2006 Test Method for Peel Strength of Garments Using Bonded Interlining". The experimental data are shown in Table 2.

[0056] Table 2. Experimental data on the adhesive properties of down jacket fabrics.

[0057]

[0058]

[0059] Note: All the above data have been validated for variance.

[0060] Experimental conclusion: As can be seen from the data in Table 2 above, the down jacket fabrics of Examples 1-3 all have good adhesion properties. After multiple washes, the PTFE coating layer and the base layer are not easy to fall off or separate, which makes the PTFE coating layer stable and long-lastingly bonded to the base layer. Among them, the down jacket fabric of Example 2 has better performance and is the optimal example.

[0061] The difference between Comparative Example 1 and Comparative Example 2 is that the Kandelia candel extract was replaced with equal amounts of guar gum and gum arabic, respectively. However, the data in Table 2 shows that the use of guar gum and gum arabic resulted in a significant decrease in the average peel strength of the down jacket fabric in both the warp and weft directions. Combined with the data from the blank group, it is speculated that the Kandelia candel extract and nano-silver particles can improve the flowability and viscosity of polyurethane adhesives after microwave irradiation treatment, thereby enabling the coating to be evenly dispersed after being applied to the base surface. Combined with the increase in viscosity, this can improve the adhesion performance between the PTFE coating layer and the base layer.

[0062] 2.2 To further explore the impact of the preparation process on the performance of down jacket fabrics, comparative examples 3-5 were set up based on Example 2, as follows:

[0063] Comparative Example 3

[0064] A PTFE-coated down jacket fabric with a nano-silver ion layer differs from Example 2 in that, in this comparative example, the nano-silver particles and the eggplant hypocotyl extract were thoroughly mixed but not subjected to microwave irradiation.

[0065] Comparative Example 4

[0066] In this comparative example, the difference from Example 2 lies in step S3, specifically,

[0067] S3. Apply the coating evenly to the base surface, lay the PTFE film flat on the coating surface with the base surface below and the PTFE film above. After standing for 12 minutes, perform the first hot pressing. After cooling down, perform the second hot pressing. After cooling down, the down jacket fabric is obtained.

[0068] Comparative Example 5

[0069] In this comparative example, the difference from Example 2 lies in step S3, specifically,

[0070] S3. Apply the coating evenly to the base surface, lay the PTFE film flat on the coating surface with the base surface below and the PTFE film above. After standing for 12 minutes, perform the first hot pressing. After cooling down, flip it over so that the PTFE film is below and the base surface is above, and perform the second hot pressing. After cooling down, you will get the down jacket fabric.

[0071] The down jacket fabrics of groups 3-5 were tested according to the above testing methods, and the test data are shown in Table 3:

[0072] Table 3. Experimental data on the adhesive properties of down jacket fabrics.

[0073]

[0074]

[0075] Note: All the above data have been validated for variance.

[0076] Conclusion: The difference between Comparative Example 3 and Example 2 is that the microwave irradiation treatment of Kandelia candel hypocotyl extract and nano-silver particles was omitted. The average peel strength in both the warp and weft directions decreased significantly. This indicates that only after microwave treatment can Kandelia candel hypocotyl extract and nano-silver particles improve the fluidity and viscosity of polyurethane adhesive after mixing, thereby improving the adhesion between the PTFE coating layer and the base layer.

[0077] The difference between Comparative Examples 4 and 5 and Example 2 lies in the hot pressing process. In Example 2, the base layer was directly contacted with the hot pressing roller for the first hot pressing, and the PTFE film was directly contacted with the hot pressing roller for the second hot pressing.

[0078] Comparative Example 4 shows the first hot pressing of PTFE film directly contacting the hot press roller, and the second hot pressing of PTFE film directly contacting the hot press roller.

[0079] Comparative Example 5 shows the first hot pressing of the PTFE film directly into the hot press roller, and the second hot pressing of the base layer directly into the hot press roller.

[0080] As can be seen from the data in Table 3 above, the changes in the hot pressing process in Comparative Examples 4-5 compared to Example 2 also have a certain impact on the average peel strength in the warp and weft directions of the down jacket fabric.

[0081] II. Breathability Test of Down Jacket Fabric

[0082] The air permeability of the down jacket fabrics produced according to Examples 1-3, Comparative Examples 1-5, and the blank group was tested. The air permeability test was conducted according to the test method in GB / T 5453-1997 Textiles - Determination of Air Permeability of Fabrics. The specific test data are shown in Table 4.

[0083] Table 4. Experimental data on the breathability of down jacket fabrics

[0084]

[0085] Note: All the above data have been validated for variance.

[0086] Conclusion: The down jacket fabrics of Examples 1-3 all have good breathability, among which Example 2 has the best breathability;

[0087] Compared with the blank group and comparative examples 1-3, the modified nano-silver ion layer was used to bond the base layer and PTFE coating together. The nano-silver particles and eggplant hypocotyl extract were microwave-treated and then mixed with polyurethane adhesive, which had a synergistic effect. While improving the fluidity and viscosity of polyurethane adhesive, it did not affect the breathability of the prepared down jacket fabric.

[0088] The data from Comparative Examples 4 and 5 show that the hot-pressing process was adjusted compared to Example 2, resulting in a significant decrease in the breathability of the down jacket fabric. This indicates that flipping the jacket with the PTFE coating on the bottom and the base layer on top, allowing it to stand for 12 minutes, and then performing the first hot-pressing and cooling, followed by flipping it again with the PTFE coating on top and performing the second hot-pressing and cooling, allows some of the coating on the base layer to penetrate into the microporous structure of the PTFE coating. The subsequent first and second hot-pressing processes allow a mesh-like, porous structure to be formed between the coating and the inner wall of the microporous structure of the PTFE coating. This maintains both the adhesive properties of the down jacket fabric and good breathability. The formation of the mesh-like, porous structure mainly depends on the airflow within the micropores of the PTFE coating during hot pressing.

[0089] 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 a PTFE-coated down jacket fabric with a nano-silver ion layer, characterized in that: The fabric comprises a base layer, and a modified nano-silver ion layer and a PTFE film layer are sequentially arranged on the surface of the base layer. The preparation raw material of the modified nano-silver ion layer comprises, by weight fraction, 15-20 parts of nano-silver particles, 35-42 parts of kandelia candel embryo axis extract, 18-22 parts of polyurethane adhesive, and 20-30 parts of distilled water. The kandelia candel embryo axis extract is obtained by grinding and crushing fresh kandelia candel embryo axis at a mature stage, adding medical 75% ethanol solution and water for 4-7 hours of soaking, filtering, standing for 12-15 hours at 5-10°C, removing supernatant, collecting precipitate, and drying the precipitate to obtain the kandelia candel embryo axis extract. The preparation method comprises the following specific steps: S1, mixing the nano-silver particles and the kandelia candel embryo axis extract, and performing microwave irradiation treatment to obtain a premix system; S2, uniformly mixing the polyurethane adhesive and the distilled water, adding them into the premix system, and performing heating and holding to obtain a coating; S3, uniformly coating the coating on the surface of the base layer, laying the PTFE film on the surface of the coating, inverting to place the PTFE film under the base layer, performing first hot pressing after standing for 8-15 minutes, cooling and cooling after the second hot pressing, inverting to place the base layer under the PTFE film, and obtaining the down jacket fabric after cooling and cooling.

2. The preparation method of the PTFE coated down jacket fabric with nano-silver ion layer according to claim 1, characterized in that: In step S1, the microwave irradiation treatment power is 200-300 W, the microwave irradiation treatment time is 6-10 minutes, and the microwave irradiation temperature is 55-65°C.

3. The preparation method of the PTFE coated down jacket fabric with nano-silver ion layer according to claim 1, characterized in that: In step S2, the heating and holding temperature is 60-70°C.

4. The preparation method of the PTFE coated down jacket fabric with nano-silver ion layer according to claim 1, characterized in that: In step S3, the coating amount of the paint was 140-160 g / m 2 .

5. The preparation method of the PTFE coated down jacket fabric with nano-silver ion layer according to claim 1, characterized in that: In step S3, the first hot pressing pressure is 2-4 MPa, the first hot pressing temperature is 150-160°C, the second hot pressing pressure is 10-14 MPa, and the second hot pressing temperature is 120-130°C.

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