Micro-nano film-coated cotton fabric downproof fabric and preparation method thereof

Abstract

The invention discloses a micro-nano film-coated cotton fabric down-proof fabric which is composed of a base layer and a functional film-coated layer. The functional film coating layer is arranged on the surface of the substrate layer; the functional film coating layer is prepared from the following components in parts by mass: 40 to 60 parts of polyether polyol, 20 to 40 parts of diisocyanate, 5 to 10 parts of a chain extender, 3 to 8 parts of nanoscale silicon dioxide particles and 0.1 to 0.5 part of dibutyltin dilaurate. The problem that existing cotton fabric leaks down is solved, and meanwhile it is guaranteed that the fabric has good softness, breathability, environment friendliness and durability.

Description

Technical Field

[0001] The present invention relates to the technical field of functional textiles, and particularly to a fabric for improving the anti-feather leakage performance of cotton fabrics through micro-nano coating technology and its preparation process, which is applicable to high-value-added products such as down jackets, sleeping bags, and home textiles. Background Art

[0002] In the field of winter clothing, warm clothes such as down jackets are highly favored by consumers due to their good heat preservation performance. However, when traditional cotton fabric is used for products such as down jackets, the problem of feather leakage often occurs. Feather leakage not only affects the appearance of the clothing, making the surface of the clothing appear with fluff and reducing the beauty of the clothing, but also may lead to a reduction in the amount of down filling, thereby affecting the heat preservation performance.

[0003] Currently, there are some solutions for anti-feather leakage fabrics in the market. For example, using a fabric organizational structure with high warp and weft density, but this method often increases the hardness of the fabric, reduces the softness and breathability of the fabric, and greatly reduces the wearing comfort. There is also adding chemical auxiliaries during the after-treatment process to improve the anti-feather leakage performance, but the use of chemical auxiliaries may have environmental problems and poor durability, and the anti-feather leakage effect significantly decreases after multiple washes. Therefore, it is of great practical significance to develop a micro-nano coated cotton fabric anti-feather leakage fabric that not only has excellent anti-feather leakage performance but also can ensure the fabric is soft, comfortable, breathable, environmentally friendly and durable. Summary of the Invention

[0004] To solve the above problems, the present invention provides a micro-nano coated cotton fabric anti-feather leakage fabric, which solves the problem of feather leakage of existing cotton fabric, and at the same time ensures that the fabric has good softness, breathability, environmental friendliness and durability.

[0005] The technical solution of the present invention is: a micro-nano coated cotton fabric anti-feather leakage fabric, which is composed of a base layer and a functional coating layer; the functional coating layer is arranged on the surface of the base layer; the functional coating layer is composed of the following components in parts by mass: Polyether polyol 40 - 60 parts Diisocyanate 20 - 40 parts Chain extender 5 - 10 parts Nanoscale silica particles 3 - 8 parts Dibutyltin dilaurate 0.1 - 0.5 parts.

[0006] The polyether polyol of the present invention is used as a soft segment component in the micro-nano coating material, providing flexibility and processability to the material. Its molecular weight is selected between 2000 - 3000, and the hydroxyl value range is 50 - 60mgKOH / g. In the whole formulation, it can ensure that the formed micro-nano coating has good flexibility, avoiding affecting the softness of the fabric due to excessive hardness, and at the same time acting synergistically with other components to ensure the stability of the overall performance of the composite material.

[0007] The diisocyanate of the present invention reacts with the polyether polyol to form the main chain structure of polyurethane, endowing the material with strength and stability. The diisocyanate is toluene diisocyanate (TDI) or diphenylmethane diisocyanate (MDI). Preferably, it is MDI because of its high reactivity and rigid structure, which can improve the performance of the micro-nano coating material. Adding diisocyanate in the present invention plays a key role in forming a micro-nano coating with appropriate strength and stability, contributing to improving the durability of the anti-feather leakage fabric.

[0008] The nano-scale silica particles of the present invention are added to the micro-nano coating material as functional additives, which can improve the mechanical properties, thermal stability and uniformity of the microporous structure of the material. Its particle size is between 30 - 50 nanometers. The nano-silica particles can be evenly dispersed in the polyurethane prepolymer to form a more stable and uniform microporous structure, enhancing the anti-feather leakage performance and breathability of the micro-nano coating.

[0009] The functional coating layer component of the present invention also includes 0.1 - 3 parts of graphene oxide.

[0010] The graphene oxide of the present invention has high strength and modulus. When added to the functional coating layer, it can interact with the polyurethane molecular chain, acting as a physical crosslinking point to restrict the movement of the molecular chain, thereby improving the mechanical properties such as tensile strength, tear strength and hardness of the material.

[0011] In addition, graphene oxide has good thermal stability and low thermal conductivity. In the functional coating layer, it can form a thermal barrier to hinder the transfer of heat, increase the thermal decomposition temperature of the material, enable the material to maintain good performance in high-temperature environments, and broaden its application temperature range.

[0012] The two-dimensional sheet structure of graphene oxide can be evenly dispersed in the composite material and form tortuous channels, increasing the diffusion path of gas and liquid molecules, thereby improving the barrier performance of the material, which can further prevent the down from passing through the fabric pores and enhance the anti-feather leakage effect.

[0013] Graphene oxide has a certain degree of conductivity. When added to the functional coating layer, it imparts a certain degree of conductivity to the material, effectively preventing the accumulation of static electricity. In actual use, it reduces problems such as down absorption and fabric dust absorption caused by static electricity, improving the performance and aesthetics of the fabric.

[0014] Optimize the microporous structure: The addition of graphene oxide will affect the phase separation behavior of polyurethane during the film formation process, helping to form a more uniform and fine microporous structure, which can not only improve the breathability of the fabric, but also make the size of the micropores more uniform, further enhancing the anti-down performance.

[0015] The base layer of the present invention is made of combed cotton with a yarn count of 60-80, which is interwoven with warp and weft, and the warp and weft density is 120×100-140×120 strands / inch.

[0016] The method for preparing the micro-nano coated cotton fabric anti-downhole fabric of the present invention comprises the following steps: (1) Preparation of polyurethane prepolymer: Add polyether polyol, diisocyanate, chain extender and dibutyltin dilaurate into a reaction kettle in proportion, react at 80-90°C for 3-4 hours under nitrogen protection to synthesize polyurethane prepolymer; (2) Preparation of micro-nano coating materials: Add nano-sized silica particles and disperse them evenly in the polyurethane prepolymer by high-speed stirring. Continue the reaction for 1-2 hours to obtain micro-nano coating materials. (3) Preparation of cotton fabric: 80-count combed cotton fabric with a warp and weft density of 140 × 120 threads / inch was selected and pre-treated; (4) Coating: Place the micro-nano coating material prepared in step (2) into the evaporation source of the vacuum sputtering equipment, and fix the pre-treated cotton fabric on the sputtering table; -3 -10 -4 Pa environment, the evaporation source is heated to 180-200 ° C, the micro-nano coating material is melted, and is evenly deposited on the surface of the cotton fabric through the sputtering equipment, and the coating thickness reaches 0.5-1.5 microns; (5) Finishing: Immerse the coated cotton fabric in a working solution containing 2% silicone softener at a bath ratio of 1:20, and immerse and roll it at 40-50°C for 10-15 minutes, then dry and bake it at a drying temperature of 80-90°C and a baking temperature of 150-160°C for 3-5 minutes; then immerse the fabric in a working solution containing 0.5% nano-silver antibacterial agent at a bath ratio of 1:15, and immerse and roll it at 30-40°C for 8-12 minutes, then dry it at a drying temperature of 70-80°C to obtain the final micro-nano coated cotton fabric anti-drilling fabric.

[0017] The beneficial effects of the present invention are: The special microporous structure of the micro-nano coating film and its close fit with the cotton fabric can effectively prevent down fibers from drilling out. After testing, the fabric of the present invention has a down drilling amount of less than 0.05 g / m² after more than 50 times of friction and more than 50 times of washing.

[0018] The present invention has a micro-nano film coated on the surface of the cotton base fabric. Due to its microporous structure, the air permeability of the fabric can be maintained between 800 - 1200 mm / s, ensuring the comfort during wearing and preventing a stuffy feeling. The cotton fiber base fabric of the present invention and the softening treatment during the post-finishing process endow the fabric with a soft hand feeling. Its bending stiffness is less than 0.5 cN·cm, with high wearing comfort and being suitable for close-fitting wear.

[0019] The present invention adopts environment-friendly materials and processes. The nano-silver antibacterial agent and the silicone softener both meet the environmental protection standards, and the combination of the micro-nano coating film and the cotton fabric is firm. After multiple washings and wearings, all performance remains stable, having a long service life. Specific Embodiments

[0020] The technical solution of the present invention will be clearly and completely described below through specific embodiments. Example 1

[0021] The anti-down-drilling fabric of micro-nano coated cotton fabric in this embodiment is composed of a base layer and a functional coating film layer; the functional coating film layer is arranged on the surface of the base layer; the functional coating film layer is composed of the following components in parts by mass: Polyether polyol 40 parts Diisocyanate 20 parts Chain extender 5 parts Nanoscale silica particles 3 parts Dibutyltin dilaurate 0.1 part.

[0022] The preparation method of the anti-down-drilling fabric of micro-nano coated cotton fabric is characterized by including the following steps: (1) Preparation of polyurethane prepolymer: Add polyether polyol, diisocyanate, chain extender and dibutyltin dilaurate into the reaction kettle according to the proportion, and react at 80 °C for 3 hours under nitrogen protection to synthesize the polyurethane prepolymer; (2) Preparation of micro-nano coating film material: Add nanoscale silica particles and make them evenly dispersed in the polyurethane prepolymer through high-speed stirring, and continue to react for 1 hour to obtain the micro-nano coating film material; (3) Preparation of cotton fabric: Select a 80s combed cotton fabric with a warp and weft density of 140×120 per inch, and perform pre-treatment on the cotton fabric; (4) Film Coating: Place the micro-nano film coating material prepared in step (2) into the evaporation source of the vacuum sputtering equipment, and fix the pre-treated cotton fabric on the sputtering table; in an environment with a vacuum degree of 10 -3 Pa, heat the evaporation source to 180 °C, the micro-nano film coating material melts, and is evenly deposited on the surface of the cotton fabric through the sputtering equipment, and the film coating thickness reaches 0.5 microns; (5) Post-treatment: Immerse the film-coated cotton fabric in a working solution containing 2% silicone softener, with a bath ratio of 1:20, pad-roll for 10 minutes at 40 °C, and then carry out drying and baking treatments. The drying temperature is 80 °C, the baking temperature is 150 °C, and the time is 3 minutes; then immerse the fabric in a working solution containing 0.5% nano-silver antibacterial agent, with a bath ratio of 1:15, pad-roll for 8 minutes at 30 °C, and then carry out drying treatment, and the drying temperature is 70 °C to obtain the final micro-nano film-coated cotton fabric anti-feather leakage fabric. Example 2

[0023] The micro-nano film-coated cotton fabric anti-feather leakage fabric of this example is composed of a base layer and a functional film coating layer; the functional film coating layer is arranged on the surface of the base layer; the functional film coating layer is composed of the following components in parts by mass: Polyether polyol 60 parts Diisocyanate 40 parts Chain extender 10 parts Nanoscale silica particles 8 parts Dibutyltin dilaurate 0.5 part.

[0024] A method for preparing a micro-nano film-coated cotton fabric anti-feather leakage fabric, characterized in that it includes the following steps: (1) Preparation of polyurethane prepolymer: Add polyether polyol, diisocyanate, chain extender and dibutyltin dilaurate to the reaction kettle according to the ratio, and react at 90 °C for 4 hours under nitrogen protection to synthesize polyurethane prepolymer; (2) Preparation of micro-nano film coating material: Add nanoscale silica particles, and make them evenly dispersed in the polyurethane prepolymer by high-speed stirring, and continue to react for 2 hours to obtain the micro-nano film coating material; (3) Preparation of cotton fabric: Select a 80-count combed cotton fabric with a warp and weft density of 140×120 per inch, and carry out pre-treatment on the cotton fabric; (4) Film Coating: Place the micro-nano film coating material prepared in step (2) into the evaporation source of the vacuum sputtering equipment, and fix the pre-treated cotton fabric on the sputtering table; in an environment with a vacuum degree of 10 -4 Pa, heat the evaporation source to 200 °C, the micro-nano film coating material melts, and is evenly deposited on the surface of the cotton fabric through the sputtering equipment, and the film coating thickness reaches 1.5 microns; (5) Post-treatment: Immerse the film-coated cotton fabric in a working solution containing 2% silicone softener with a bath ratio of 1:20, pad at 50 °C for 15 minutes, then perform drying and curing treatments. The drying temperature is 90 °C, the curing temperature is 160 °C, and the time is 5 minutes. Then immerse the fabric in a working solution containing 0.5% nano-silver antibacterial agent with a bath ratio of 1:15, pad at 40 °C for 12 minutes, and then perform drying treatment at 80 °C to obtain the final micro-nano film-coated cotton fabric anti-feather leakage fabric. Example 3

[0025] The micro-nano film-coated cotton fabric anti-feather leakage fabric of this example is composed of a base layer and a functional film layer; the functional film layer is arranged on the surface of the base layer; the functional film layer is composed of the following components in parts by mass: Polyether polyol 50 parts Diisocyanate 30 parts Chain extender 8 parts Nanoscale silica particles 7 parts Dibutyltin dilaurate 0.3 part Graphene oxide 0.1 part.

[0026] The preparation method of the micro-nano film-coated cotton fabric anti-feather leakage fabric is characterized by including the following steps: (1) Preparation of polyurethane prepolymer: Add polyether polyol, diisocyanate, chain extender and dibutyltin dilaurate to the reaction kettle according to the ratio, and react at 85 °C for 3.5 hours under nitrogen protection to synthesize the polyurethane prepolymer; (2) Preparation of micro-nano film-coated material: Add nanoscale silica particles, and make them uniformly dispersed in the polyurethane prepolymer by high-speed stirring, and continue to react for 1.2 hours to obtain the micro-nano film-coated material; (3) Preparation of cotton fabric: Select a 80-count combed cotton fabric with a warp and weft density of 140×120 per inch, and perform pretreatment on the cotton fabric; (4) Film coating: Put the micro-nano film-coated material prepared in step (2) into the evaporation source of the vacuum sputtering equipment, and fix the pretreated cotton fabric on the sputtering table; in an environment with a vacuum degree of 10 -3 Pa, heat the evaporation source to 188 °C, the micro-nano film-coated material melts, and is uniformly deposited on the surface of the cotton fabric through the sputtering equipment, and the film coating thickness reaches 1 micron; (5) Post-treatment: Immerse the film-coated cotton fabric in a working solution containing 2% silicone softener with a liquor ratio of 1:20, pad at 46°C for 12 minutes, then perform drying and baking treatments. The drying temperature is 88°C, the baking temperature is 152°C, and the time is 4 minutes. Then immerse the fabric in a working solution containing 0.5% nano-silver antibacterial agent with a liquor ratio of 1:15, pad at 32°C for 10 minutes, and then perform drying treatment. The drying temperature is 75°C to obtain the final micro-nano film-coated cotton fabric anti-feather leakage fabric. Example 4

[0027] The micro-nano film-coated cotton fabric anti-feather leakage fabric of this example is composed of a base layer and a functional film layer; the functional film layer is disposed on the surface of the base layer; the functional film layer is composed of the following components in parts by mass: Polyether polyol 40 - 60 parts Diisocyanate 20 - 40 parts Chain extender 5 - 10 parts Nanoscale silica particles 3 - 8 parts Dibutyltin dilaurate 0.1 - 0.5 part Graphene oxide 2 parts.

[0028] The preparation method of this example is the same as that of Example 3.

[0029] Comparative Example 1 Use a traditional high-count high-density cotton fabric (100 counts, warp and weft density of 180×160 per inch), without micro-nano film coating treatment, and perform conventional softening finishing and antibacterial finishing.

[0030] Comparative Example 2 Use an ordinary polyurethane film coating process to coat the surface of a 60-count cotton fabric (warp and weft density of 120×100 per inch), with a film coating thickness of 2 microns, and then perform the same post-treatment as in Example 1.

[0031] Perform the following performance tests on the above examples and comparative examples.

[0032] 1. Anti-feather leakage performance test: Perform the anti-feather leakage performance test on the fabrics of the examples and comparative examples according to GB / T 12790-2009 "Test Method for Feather Leakage of Down Jackets". The results show that the feather leakage amount of the fabrics in the examples is all lower than 0.05 g / m², while the feather leakage amount of Comparative Example 1 is 0.2 g / m², and the feather leakage amount of Comparative Example 2 is 0.1 g / m².

[0033] 2. Air permeability test: The air permeability of each fabric was tested according to GB / T 5453-1997 "Determination of Air Permeability of Textiles". The air permeability rate of the fabric in Example 1 was 1000 mm / s, the air permeability rate of the fabric in Example 2 was 900 mm / s, the air permeability rate of the fabric in Example 3 was 1030 mm / s, the air permeability rate of the fabric in Example 5 was 1010 mm / s, the air permeability rate of the fabric in Comparative Example 1 was 600 mm / s, and the air permeability rate of the fabric in Comparative Example 2 was 700 mm / s.

[0034] 3. Softness test: The bending stiffness of the fabric was measured by a KES-FB bending stiffness tester. The bending stiffness of the fabric in Example 1 was 0.4 cN·cm, the bending stiffness of the fabric in Example 2 was 0.45 cN·cm, the bending stiffness of the fabric in Example 3 was 0.41 cN·cm, the bending stiffness of the fabric in Example 4 was 0.4 cN·cm, the bending stiffness of the fabric in Comparative Example 1 was 0.6 cN·cm, and the bending stiffness of the fabric in Comparative Example 2 was 0.55 cN·cm.

[0035] 4. Antibacterial performance test: The antibacterial performance of each fabric was tested according to GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles - Part 3: Oscillation Method". The antibacterial rates of the fabrics in Examples 1-4 against Escherichia coli, Staphylococcus aureus and Candida albicans all reached over 99%. The antibacterial rates of the fabrics in Comparative Example 1 and Comparative Example 2 could also reach over 95%. However, after 50 washes, the antibacterial rates of the fabrics in Examples 1 and 2 could still remain above 90%, while after 50 washes, the antibacterial rates of the fabrics in Comparative Example 1 and Comparative Example 2 decreased to about 80%.

[0036] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the technical solution of the present invention.

Claims

1. Micro-nano coated cotton fabric anti-feather leakage fabric, characterized in that: It is composed of a base layer and a functional coating layer; the functional coating layer is disposed on the surface of the base layer; the functional coating layer is composed of the following components in parts by mass: Polyether polyol 40 - 60 parts Diisocyanate 20 - 40 parts Chain extender 5 - 10 parts Nanoscale silica particles 3 - 8 parts Dibutyltin dilaurate 0.1 - 0.5 part.

2. The micro-nano coated cotton fabric anti-feather leakage fabric according to claim 1, characterized in that: It also includes 0.1 - 3 parts of graphene oxide.

3. The micro-nano coated cotton fabric anti-feather leakage fabric according to claim 1, wherein: The polyether polyol has a molecular weight of 2000 - 3000 and a hydroxyl value range of 50 - 60 mgKOH / g.

4. The micro-nano coated cotton fabric anti-feather leakage fabric according to claim 1, characterized in that: The diisocyanate is toluene diisocyanate or diphenylmethane diisocyanate.

5. The micro-nano film-coated cotton fabric anti-feather leakage fabric according to claim 1, characterized in that: The chain extender is ethylene glycol, diethylene glycol or 1,4 - butanediol.

6. The micro-nano film-coated cotton fabric anti-feather leakage fabric according to claim 1, characterized in that: The base layer is made of combed cotton with a yarn count of 60 - 80 and a warp and weft density of 120×100 - 140×120 per inch.

7. The preparation method of the micro-nano coated cotton fabric anti-down leakage fabric according to claim 1, characterized in that: It includes the following steps: (1) Preparation of polyurethane prepolymer: Add polyether polyol, diisocyanate, chain extender and dibutyltin dilaurate into a reaction kettle in proportion, and react at 80 - 90 °C for 3 - 4 hours under nitrogen protection to synthesize the polyurethane prepolymer; (2) Preparation of micro - nano coating material: Add nanoscale silica particles, and make them uniformly dispersed in the polyurethane prepolymer by high - speed stirring, and continue to react for 1 - 2 hours to obtain the micro - nano coating material; (3) Preparation of cotton fabric: Select a combed cotton fabric with a yarn count of 80 and a warp and weft density of 140×120 per inch, and perform pretreatment on the cotton fabric; (4) Film Coating: Put the micro-nano film coating material prepared in step (2) into the evaporation source of the vacuum sputtering equipment, and fix the pre-treated cotton fabric on the sputtering table; in an environment with a vacuum degree of 10 -3 -10 -4 Pa, heat the evaporation source to 180 - 200 °C, the micro-nano film coating material melts, and is uniformly deposited on the surface of the cotton fabric through the sputtering equipment, and the film coating thickness reaches 0.5 - 1.5 microns; (5) Post - finishing: Immerse the coated cotton fabric in a working solution containing 2% silicone softener with a liquor ratio of 1:20, pad at 40 - 50 °C for 10 - 15 minutes, and then perform drying and curing treatments. The drying temperature is 80 - 90 °C, the curing temperature is 150 - 160 °C, and the time is 3 - 5 minutes; then immerse the fabric in a working solution containing 0.5% nano - silver antibacterial agent with a liquor ratio of 1:15, pad at 30 - 40 °C for 8 - 12 minutes, and then perform drying treatment. The drying temperature is 70 - 80 °C to obtain the final micro - nano coated cotton fabric anti - feather - leakage fabric.