A breathable and waterproof fabric for down clothing and a method for manufacturing the same

Abstract

The application relates to a breathable and waterproof type fabric for down clothes and a preparation method thereof, the preparation method is as follows: after a silica modified polyurethane nanofiber membrane is hot-pressed and compounded on the surface of a fabric body, the breathable and waterproof type fabric for down clothes is prepared; the silica modified polyurethane nanofiber membrane is obtained in the following manner: after a polyurethane emulsion is modified by using ferulic acid and trimethyl hexamethylene diisocyanate, electrostatic spinning liquid is obtained, the modified polyurethane nanofiber membrane is prepared through electrostatic spinning, and then is soaked in a hydrophobic fumed nanosilica solution to obtain the silica modified polyurethane nanofiber membrane. The breathable and waterproof type fabric prepared by the application has good water-repellent and waterproof performance, can also maintain good air permeability and moisture permeability, realizes the balance between the air permeability, moisture permeability, waterproofness and water repellency of the fabric, and the breathable and waterproof type fabric has good mechanical properties, so as to meet the use requirements of the down clothes fabric.

Description

Technical Field

[0001] This invention belongs to the field of fabric technology, specifically relating to a breathable and waterproof fabric for down garments and its preparation method. Background Technology

[0002] Down jacket fabrics need to balance waterproofness and breathability, which are interdependent and complementary. Waterproof performance ensures the protective function of down jackets in harsh weather, while breathability ensures comfort and health when wearing them. Only by taking both into account can the comprehensive needs of down jackets in terms of warmth, comfort and durability be truly met.

[0003] In the prior art, polyurethane solution can be electrospun into nanofiber membranes. These nanofiber membranes have a certain porosity, are breathable, and can also block the penetration of moisture to a certain extent. Hot-pressing them onto the surface of fabric can improve the waterproof performance of the fabric and maintain a certain breathability. However, the mechanical properties of these nanofiber membranes are poor and their durability is reduced. Based on this problem, the present invention provides a breathable and waterproof fabric for down clothing and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a breathable and waterproof fabric for down garments and a method for preparing the same, in order to solve the above-mentioned problems.

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

[0006] A method for preparing a breathable and waterproof fabric for down garments involves hot-pressing a silica-modified polyurethane nanofiber membrane onto the surface of the fabric body to obtain the breathable and waterproof fabric for down garments.

[0007] The method for obtaining silica-modified polyurethane nanofiber membrane is as follows: after modifying polyurethane emulsion with ferulic acid and trimethylhexamethylene diisocyanate to obtain electrospinning solution, the modified polyurethane nanofiber membrane is made by electrospinning, and then soaked in hydrophobic fumed silica nanofiber solution.

[0008] As a further optimization of the present invention, the polyurethane emulsion contains 8-15% polyurethane by mass, and the solvent in the polyurethane emulsion is at least one of N,N-dimethylformamide, tetrahydrofuran, and butyl acetate.

[0009] As a further optimization of the present invention, the content of ferulic acid in the electrospinning solution is 1-2 wt%, and the content of trimethylhexamethylene diisocyanate is 1-4 wt%.

[0010] As a further optimization of the present invention, the hydrophobic fumed silica solution comprises, by weight, 7-12 parts of hydrophobic fumed silica, 80-90 parts of anhydrous ethanol, 2-5 parts of dispersant, and 1-3 parts of thickener.

[0011] As a further optimization of the present invention, the dispersant is at least one of polyethylene glycol and polyvinyl alcohol; the thickener is at least one of hydroxyethyl cellulose, hydroxypropyl methylcellulose, and polyvinylpyrrolidone.

[0012] As a further optimization of the present invention, the modification treatment involves adding ferulic acid and trimethylhexamethylene diisocyanate to a polyurethane emulsion in a certain proportion and stirring continuously for 6-8 hours at a temperature of 60-70°C.

[0013] As a further optimization of the present invention, the immersion treatment involves immersing the modified polyurethane nanofiber membrane in a hydrophobic fumed silica solution at a temperature of 40-50°C for 4-7 hours.

[0014] The mass ratio of the modified polyurethane nanofiber membrane to the hydrophobic vapor-phase nano-silica solution is 1:6-10.

[0015] A breathable and waterproof fabric for down garments is prepared by the above-described method.

[0016] The beneficial effects of this invention are as follows:

[0017] 1) The breathable and waterproof fabrics prepared by the preparation method of the present invention have good water repellency and waterproof performance, and can also maintain good breathability and moisture permeability, achieving a balance between the breathability and moisture permeability of the fabric and its waterproof and water repellency. In addition, the breathable and waterproof fabrics of the present invention also have good mechanical properties to meet the usage requirements of down jacket fabrics.

[0018] 2) This invention utilizes ferulic acid and trimethylhexamethylene diisocyanate to modify polyurethane, resulting in a modified polyurethane nanofiber membrane with high porosity and a more stable and uniformly dispersed cross-linked network. When the membrane is then immersed in a hydrophobic vapor-phase nano-silica solution, the particles are more evenly dispersed, thus giving the fabric high waterproof and water-repellent properties, mechanical properties, and high breathability and moisture permeability, while improving durability. Detailed Implementation

[0019] 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.

[0020] I. Materials

[0021] 1. Ferulic acid (FA), purchased from Shanghai Yuanye Biotechnology Co., Ltd., HPLC ≥ 98%;

[0022] 2. Trimethylhexamethylene diisocyanate (TMDI) was purchased from Hubei Hengjingrui Chemical Co., Ltd., with a purity of 98%; 4,4'-diphenylmethane diisocyanate (4,4'-MDI) was purchased from Hubei Kewode Chemical Co., Ltd., with a purity of 99%.

[0023] 3. N,N-dimethylformamide, tetrahydrofuran, and butyl acetate were purchased from Nantong Runfeng Petrochemical Co., Ltd., with a purity of 99%. Polyurethane was purchased from Shanghai Jingjian Plastics Co., Ltd., with a purity of 99%.

[0024] 4. Hydrophobic fumed silica nanoparticles: R972 hydrophobic fumed silica nanoparticles, purchased from Shandong Yousuo Chemical Technology Co., Ltd., with a purity of 99%;

[0025] 5. Fabric body: Commercially available nylon fabric, with a warp and weft fineness of 28D, a warp yarn weaving density of 55 threads / cm, and a weft yarn weaving density of 65 threads / cm.

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

[0027] II. Methods

[0028] 2.1 Preparation of breathable and waterproof fabrics

[0029] A method for preparing a breathable and waterproof fabric for down garments, comprising the following steps:

[0030] (1) Weigh N,N-dimethylformamide and polyurethane in proportion and mix them well. Heat the mixture in an oil bath to 32°C and stir continuously to dissolve the polyurethane in N,N-dimethylformamide to prepare a polyurethane emulsion. The mass fraction of polyurethane in the polyurethane emulsion is 12%. Add ferulic acid and trimethylhexamethylene diisocyanate to the polyurethane emulsion. Stir continuously at 65°C for 6 hours to prepare an electrospinning solution. The content of ferulic acid in the electrospinning solution is 1wt% and the content of trimethylhexamethylene diisocyanate is 1wt%.

[0031] (2) The electrospinning solution obtained in step (1) is electrospinned to form a modified polyurethane nanofiber membrane. The relative humidity of electrospinning is 36%, the temperature is 26℃±2℃, the pressure is 16kV, the injection speed of the spinnable sol is 2.5mm / min, and the collection speed is 60r / min. (It should be noted that the electrospinning process parameters of the electrospinning solution are those that can be adjusted by those skilled in the art according to conventional processes. This embodiment provides the specific parameters for the preparation of the fabric in this application, but is not limited to these parameters.)

[0032] (3) Weigh 9 parts of hydrophobic fumed silica, 86 parts of anhydrous ethanol, 3 parts of dispersant and 2 parts of thickener by weight, mix them to obtain a hydrophobic fumed silica solution, and immerse the modified polyurethane nanofiber membrane prepared in step (2) in the hydrophobic fumed silica solution (in this embodiment, the mass ratio of the modified polyurethane nanofiber membrane to the hydrophobic fumed silica solution is 1:8). Under the temperature of 45°C, immerse for 6 hours, take out the silica-modified polyurethane nanofiber membrane, dry it and set it aside.

[0033] (4) The silica-modified polyurethane nanofiber membrane is bonded to the surface of the fabric body and hot-pressed together to obtain a breathable and waterproof fabric, which is designated as Group A breathable and waterproof fabric.

[0034] 2.2 Raw material adjustment for the preparation of breathable and waterproof fabrics

[0035] 2.2.1 Adjustment of the content of each component raw material in the electrospinning solution:

[0036] A-T1 group of breathable and waterproof fabrics: Based on the preparation method in 2.1 above, only the content of ferulic acid in the electrospinning solution in step (1) is adjusted to 1.5wt% and the content of trimethylhexamethylene diisocyanate is adjusted to 3wt%; the rest are consistent with the preparation method in 2.1 above.

[0037] A-T2 group of breathable and waterproof fabrics: Based on the preparation method in 2.1 above, only the content of ferulic acid in the electrospinning solution in step (1) is adjusted to 2wt% and the content of trimethylhexamethylene diisocyanate is adjusted to 4wt%; the rest are consistent with the preparation method in 2.1 above.

[0038] 2.2.2 Substitution of raw materials for each component of the electrospinning solution:

[0039] A-H1 group of breathable and waterproof fabrics: Based on the preparation method in 2.1 above, in the electrospinning solution in step (1), ferulic acid was replaced with an equal mass of polyurethane emulsion, that is, only trimethylhexamethylene diisocyanate was added to the polyurethane emulsion, and the rest were consistent with the breathable and waterproof fabrics A-T1 group.

[0040] A-H2 group of breathable and waterproof fabrics: Based on the preparation method in 2.1 above, in the electrospinning solution in step (1), trimethyl hexamethylene diisocyanate was replaced with an equal mass of polyurethane emulsion, that is, only ferulic acid was added to the polyurethane emulsion, and the rest were consistent with the breathable and waterproof fabrics A-T1 group.

[0041] A-H3 group of breathable and waterproof fabrics: Based on the preparation method in 2.1 above, in the electrospinning solution in step (1), trimethylhexamethylene diisocyanate was replaced with an equal mass of 4,4'-diphenylmethane diisocyanate, that is, ferulic acid and 4,4'-diphenylmethane diisocyanate were added to the polyurethane emulsion. In other words, the content of cinnamic acid in the electrospinning solution was 1.5wt%, the content of 4,4'-diphenylmethane diisocyanate was 3wt%, and the rest were consistent with the breathable and waterproof fabrics A-T1 group.

[0042] The breathable and waterproof fabric of group A-H4: Based on the preparation method in 2.1 above, in the electrospinning solution in step (1), ferulic acid and trimethylhexamethylene diisocyanate were replaced with equal mass of polyurethane emulsion, that is, ferulic acid and trimethylhexamethylene diisocyanate were not added to the polyurethane emulsion, and the polyurethane emulsion was directly electrospinned to make polyurethane nanofiber membrane. The rest is consistent with the breathable and waterproof fabric of group A-T1.

[0043] Blank group: Commercially available fabric was used as the blank group for the control experiment.

[0044] III. Performance Testing

[0045] 3.1 Waterproof and breathable performance

[0046] Water repellency test: The contact angle was tested using an OCA 40 video contact angle meter with 8 μl of water. The reading was taken 60 seconds after the water droplet came into contact with the fabric. Five measurements were taken at different locations on the same sample, and the average value was taken (measurements with large variances were repeated). The larger the contact angle, the better the water repellency. The contact angle of each group of fabric samples prepared in steps 2.1 and 2.2 was measured and recorded in Table 1.

[0047] Air permeability test: Referring to the national standard (GB / T5433), the air permeability of the samples was tested using a YG461G fully automatic fabric air permeability meter. Specific experimental parameters were set as follows: ambient temperature 25℃, relative humidity 55%, pressure difference 100Pa, and air permeability area 25cm². 2The diameter of the air nozzle is 0.6 mm. Ten tests were conducted on different parts of each group of fabric samples prepared in steps 2.1 and 2.2, and the average value was taken as the final air permeability data, recorded in Table 1.

[0048] Moisture permeability test: According to national standard GB / T12704.1-2009(a), an FX3180 moisture permeability measuring instrument was used to test the moisture permeability of each group of fabric samples prepared in steps 2.1 and 2.2 above. During the test, the temperature was 35℃, the humidity was 85.0%, the airflow velocity was 0.7m / s, and the test area was 30.6cm². 2 Before testing, the test chamber needs to be pre-conditioned. After automatic conditioneding, the instrument begins the moisture permeability test, automatically recording moisture permeability data every hour for a total of two times. After the experiment is completed, the moisture permeability data of the samples are manually recorded. The average of the five sets of experimental data for each sample is used as the final data and recorded in Table 1.

[0049] Hydrostatic pressure resistance test: The hydrostatic pressure resistance tests were conducted on the fabric samples prepared in steps 2.1 and 2.2 according to GB / T 4744-2013. The test method was as follows: The test water on the clamping surface was wiped clean, and the sample was clamped so that the front side of the sample was in contact with the water. A continuously increasing water pressure was applied to the sample at a water pressure increase rate of 60 cm H2O / min, and the water seepage phenomenon was observed. During the pressure increase, the pressure was stopped when the third water droplet appeared on the sample, and the hydrostatic pressure value at this time was recorded, as shown in Table 1.

[0050] Table 1. Test data on the down-proof performance of the fabric

[0051]

[0052] Experimental conclusions: As shown in Table 1, the breathable and waterproof fabrics of groups A, A-T1, and A-T2 prepared by the method of the present invention all have good water repellency and waterproof performance, and can also maintain good breathability and moisture permeability, achieving a balance between the breathability, moisture permeability, waterproofness, and water repellency of the fabric. Among them, the preparation method of group A-T1 breathable and waterproof fabric is the optimal one. It is speculated that the reason is that there may be a certain synergistic effect between ferulic acid and trimethylhexamethylene diisocyanate, which can promote the generation of high porosity of modified polyurethane nanofiber membrane.

[0053] 3.2 Tensile strength and elastic recovery performance test

[0054] The tensile strength and elastic recovery of the fabrics were tested using an LLY-06BD electronic fiber tensile tester at a tensile speed of 28 mm / min, a pre-tension of 0.50 cN, and a clamping distance of 25 mm (elastic recovery rate was determined using a 5% constant elongation test). Each group of fabric samples prepared in steps 2.1 and 2.2 was tested 50 times, and the average value was calculated to obtain the tensile strength and elastic recovery properties of the fabrics. The results are shown in Table 2.

[0055] Table 2. Test data of fabric mechanical properties

[0056]

[0057]

[0058] Experimental conclusions: Table 2 shows that the breathable and waterproof fabrics of groups A, A-T1, and A-T2 prepared by this invention have better mechanical properties. Comparison reveals that, compared to the use of ferulic acid or trimethylhexamethylene diisocyanate alone, or the combined use of ferulic acid and 4,4'-diphenylmethane diisocyanate, there may be a certain synergistic effect between ferulic acid and trimethylhexamethylene diisocyanate. This can enable the modified polyurethane nanofiber membrane to form a more stable and uniformly dispersed cross-linked network, thereby enhancing the mechanical properties and durability of the modified polyurethane nanofiber membrane.

[0059] 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 breathable and waterproof fabric for down garments, characterized in that: A breathable and waterproof fabric for down garments is prepared by hot-pressing a silica-modified polyurethane nanofiber membrane onto the surface of the fabric body. The method for obtaining silica-modified polyurethane nanofiber membrane is as follows: after modifying polyurethane emulsion with ferulic acid and trimethylhexamethylene diisocyanate to obtain electrospinning solution, the modified polyurethane nanofiber membrane is made by electrospinning, and then soaked in hydrophobic fumed silica nanofiber solution. The polyurethane emulsion contains 8-15% polyurethane by mass, and the solvent in the polyurethane emulsion is at least one of N,N-dimethylformamide, tetrahydrofuran, and butyl acetate. The electrospinning solution contains 1-2 wt% ferulic acid and 1-4 wt% trimethylhexamethylene diisocyanate. The hydrophobic fumed nano silica solution comprises, by weight, 7-12 parts of hydrophobic fumed nano silica, 80-90 parts of anhydrous ethanol, 2-5 parts of dispersant, and 1-3 parts of thickener. The modification process involves adding ferulic acid and trimethylhexamethylene diisocyanate to a polyurethane emulsion in a specific ratio and stirring continuously for 6-8 hours at a temperature of 60-70°C. The immersion treatment involves immersing the modified polyurethane nanofiber membrane in a hydrophobic fumed silica solution at a temperature of 40-50°C for 4-7 hours. The mass ratio of the modified polyurethane nanofiber membrane to the hydrophobic vapor-phase nano-silica solution is 1:6-10.

2. The method for preparing a breathable and waterproof fabric for down garments according to claim 1, characterized in that: The dispersant is at least one of polyethylene glycol and polyvinyl alcohol; the thickener is at least one of hydroxyethyl cellulose, hydroxypropyl methylcellulose, and polyvinylpyrrolidone.

3. A breathable and waterproof fabric for down garments, characterized in that: It is prepared by the preparation method according to any one of claims 1-2.

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