Zero-gravity or anti-gravity anti-leakage fabric and its preparation and application

Abstract

The present invention belongs to the technical field of functional fabrics, and in particular relates to a zero-gravity or anti-gravity anti-leakage fabric, and its preparation and application. The preparation method of the zero-gravity or anti-gravity anti-leakage fabric provided by the present invention comprises the following steps: coating a polyurethane solution on the surface of a hydrophilic fabric substrate to obtain a surface-modified fabric; coating a silica suspension on the surface of the surface-modified fabric; obtaining a silica-modified wet fabric; and drying the silica-modified wet fabric to obtain the zero-gravity or anti-gravity anti-leakage fabric. The zero-gravity or anti-gravity anti-leakage fabric provided by the present invention has self-absorption and can absorb liquid from one side to the other without the action of gravity when in contact with liquid, without backflow.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional fabrics, and in particular relates to a zero-gravity or anti-gravity leakage-proof fabric and its preparation and application. Background Art

[0002] Disposable sanitary products that absorb human secretions, such as diapers and sanitary napkins, have seen rapid growth in recent years. However, existing diapers and sanitary napkins rely on gravity to absorb liquids. When a person is lying flat, in zero gravity, or even inverted (as seen in diapers and sanitary napkins worn by astronauts, pilots, and patients), the anti-gravity or zero-gravity environment makes it difficult for liquids to move in a certain direction. Consequently, the diaper's drainage layer is unable to provide sufficient absorption capacity, leading to backflow.

[0003] Existing technologies for preventing leakage in drainage layers mostly involve structural design. For example, Chinese patent CN110279525A discloses a drainage layer for sanitary napkins or diapers, comprising a diffusion layer, a diffusive sponge layer, a unidirectional liquid-conducting membrane, and a hydrophobic edge seal. The diffusion layer is circumferentially provided with a plurality of inclined channels, each with an inclination angle of 125-165 degrees. While research has examined the leakage-proof performance of the drainage layer from a structural design perspective, its leakage-proof performance is poor when used in zero gravity or anti-gravity conditions. Summary of the Invention

[0004] In view of this, the present invention provides a zero-gravity or anti-gravity anti-leakage fabric and its preparation and application. The zero-gravity or anti-gravity anti-leakage fabric provided by the present invention has self-absorption when in contact with liquid, and can absorb liquid from one side to the other without the action of gravity, and at the same time does not flow back.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing a zero-gravity or anti-gravity leakage-proof fabric, comprising the following steps:

[0007] Coating a polyurethane solution on the surface of a hydrophilic fabric substrate to obtain a surface-modified fabric;

[0008] coating a silica suspension on the surface of the surface-modified fabric to obtain a silica-modified wet fabric;

[0009] The silicon dioxide modified wet fabric is dried to obtain the zero-gravity or anti-gravity leakage-proof fabric.

[0010] Preferably, the mass concentration of the silica suspension is 2 to 4 g / L.

[0011] Preferably, the particle size of the silicon dioxide in the silicon dioxide suspension is ≤600 nm.

[0012] Preferably, the coating amount of the silica suspension is 0.01 to 0.2 L / m 2 .

[0013] Preferably, the mass percentage of the polyurethane solution is 20 to 50 wt.%.

[0014] Preferably, the coating amount of the adhesive solution is 0.1 to 0.5 L / m 2 .

[0015] Preferably, the coating distance when applying the adhesive solution and the coating distance when applying the silica suspension are independently 20 to 30 cm, the coating pressure is independently 0.5 to 1.5 MPa, and the coating time is independently 20 to 300 s.

[0016] Preferably, the drying temperature is 45-60°C.

[0017] The present invention provides a zero-gravity or anti-gravity leakage-proof fabric obtained by the preparation method described in the above technical solution, comprising a hydrophilic fabric layer and hydrophobic silica particles bonded to the hydrophilic fabric layer.

[0018] The present invention provides the use of the zero-gravity or anti-gravity leakage-proof material described in the above technical solution in disposable sanitary products for absorbing human secretions.

[0019] The present invention provides a method for preparing a zero-gravity or anti-gravity leakage-proof fabric, comprising the following steps: coating a polyurethane solution on the surface of a hydrophilic fabric substrate to obtain a surface-modified fabric; coating a silica suspension on the surface of the surface-modified fabric to obtain a silica-modified wet fabric; and drying the silica-modified wet fabric to obtain the zero-gravity or anti-gravity leakage-proof fabric. The present invention provides a preparation method, which includes first coating a polyurethane solution on the surface of a hydrophilic fabric substrate to enhance the bonding ability of the hydrophilic fiber surface, then coating a silica suspension and drying the resulting structure, and bonding hydrophobic silica particles to the hydrophilic fiber surface, thereby forming a hydrophobic-hydrophilic gradient structure from the surface to the inside of the hydrophilic fabric substrate, wherein the surface comprises hydrophobic silica particles and the inner layer comprises hydrophilic fibers. Furthermore, as the depth changes from the surface to the inside, the density of the silica particles decreases continuously, the silica particles on the surface are the densest, and gradually change from dense to sparse, forming capillary channels on the surface of the hydrophilic fabric to generate a capillary phenomenon, thereby achieving the penetration of surface liquid in the absence of gravity. Simultaneously, the outermost layer of the hydrophilic fabric is a hydrophobic layer formed by hydrophobic, dense silica particles, which effectively prevents liquid entering the interior of the hydrophilic fibers from undergoing reverse osmosis. Therefore, the zero-gravity or anti-gravity anti-leakage fabric provided by the present invention has self-absorption, and when in contact with liquid, can absorb the liquid from one side to the other without gravity, without backflow. The results of the examples show that the zero-gravity or anti-gravity leakage-proof fabric provided by the present invention can absorb liquid and prevent leakage in zero gravity or anti-gravity.

[0020] The preparation method provided by the invention uses existing hydrophilic fabric as a base material, is easy to operate and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a process for preparing zero-gravity or anti-gravity anti-leakage fabric according to an embodiment of the present invention;

[0022] Figure 2 This is an electron microscope photograph of the hydrophilic fabric substrate of Example 1 of the present invention;

[0023] Figure 3 This is an electron microscope photograph of the product prepared in Example 1 of the present invention;

[0024] Figure 4 is the line roughness curve of the hydrophilic fabric substrate of Example 1 of the present invention;

[0025] Figure 5 This is the line roughness curve of the product prepared in Example 1 of the present invention;

[0026] Figure 6 This is a laser scanning confocal microscope photograph of the hydrophilic fabric substrate of Example 1 of the present invention;

[0027] Figure 7This is a laser scanning confocal microscope photograph of the product prepared in Example 1 of the present invention;

[0028] Figure 8 The liquid absorption process of the product prepared in the embodiment of the present invention under the action of gravity;

[0029] Figure 9 The liquid absorption process of the product prepared in Example 1 of the present invention under anti-gravity;

[0030] Figure 10 The results of water permeability and water blocking tests of the product prepared in Example 1 of the present invention under gravity in both normal and reverse phases are shown;

[0031] Figure 11 This is a comparison diagram of the side view and bottom view of the product prepared in Example 1 of the present invention under the action of anti-gravity. DETAILED DESCRIPTION

[0032] The present invention provides a method for preparing a zero-gravity or anti-gravity leakage-proof fabric, comprising the following steps:

[0033] coating a polyurethane solution on the surface of a hydrophilic fabric substrate to obtain a surface-modified fabric;

[0034] coating a silica suspension on the surface of the surface-modified fabric to obtain a silica-modified wet fabric;

[0035] The silicon dioxide modified wet fabric is dried to obtain the zero-gravity or anti-gravity leakage-proof fabric.

[0036] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0037] The present invention coats the surface of a hydrophilic fabric substrate (hereinafter referred to as the first coating) with a polyurethane solution to obtain a surface-modified fabric.

[0038] The present invention has no special requirements on the type and source of the hydrophilic fabric substrate; in the present invention, the hydrophilic fabric substrate is preferably a hydrophilic fabric for the diversion layer of disposable sanitary products for human secretions or hydrophilic fabrics for other purposes. In the present invention, the disposable sanitary products for human secretions preferably include female menstrual hygiene products and / or excrement hygiene products; in the present invention, the hydrophilic fabric substrate preferably includes a knitted fabric or woven fabric, or a non-woven fabric made of hydrophilic fibers; the non-woven fabric is preferably a hot air non-woven fabric; in the present invention, the hydrophilic fibers constituting the hydrophilic fabric are preferably one or more of cotton fibers, viscose fibers, polyvinyl alcohol fibers and acetate fibers.

[0039] In the present invention, the mass percentage of the polyurethane solution is preferably 20 to 50 wt.%, more preferably 25 to 45 wt.%; the polyurethane solution is preferably a polyurethane aqueous solution.

[0040] The present invention preferably uses a polyurethane aqueous solution as the binder solution, which is safe and harmless and can be used for disposable sanitary products for human secretions.

[0041] In the present invention, the coating amount of the polyurethane solution is preferably 0.1 to 0.5 L / m 2 , more preferably 0.2 to 0.4 L / m 2 .

[0042] In the present invention, the first coating is preferably spraying, and the spraying distance is preferably 20 to 30 cm, more preferably 21 to 28 cm, and most preferably 25 cm; the coating pressure is preferably 0.5 to 1.5 MPa, more preferably 0.6 to 1.2 MPa, and most preferably 1 MPa; the coating time is preferably 20 to 300 s, more preferably 50 to 200 s, and most preferably 120 s. In the present invention, the first coating method is preferably spraying, and the spraying is preferably performed by a spray gun. The present invention has no special requirements for the specific implementation process of the spraying.

[0043] After obtaining the surface-modified fabric, the present invention coats the surface of the modified fabric (hereinafter referred to as the second coating) with a silica suspension to obtain a silica-modified wet fabric.

[0044] In the present invention, the mass concentration of the silica suspension is preferably 2-4 g / L, more preferably 2.5-3.5 g / L; the particle size of the silica in the silica suspension is preferably ≤600 nm, more preferably 100-500 nm.

[0045] In the present invention, the solvent in the silica suspension is preferably a lower alcohol, more preferably ethanol. The present invention preferably uses ethanol as the solvent for the silica suspension, which is safe and harmless and can be used in disposable sanitary products for human secretions.

[0046] In the present invention, the method for preparing the silica suspension preferably includes the following steps: ultrasonically mixing silica and a solvent to obtain the silica suspension; in the present invention, the temperature of the ultrasonic mixing is preferably room temperature, and when the mass concentration of the silica suspension is preferably 2 to 4 g / L, the time of the ultrasonic mixing is preferably 3 to 5 hours; the present invention has no special requirements for the specific implementation process of the ultrasonic mixing.

[0047] In the present invention, the coating amount of the silica suspension is preferably 0.01 to 0.2 L / m 2 , more preferably 0.05 to 0.15 L / m2 .

[0048] In the present invention, the coating distance during the second coating is preferably 20 to 30 cm, more preferably 21 to 28 cm, and most preferably 25 cm; the coating pressure is preferably 0.5 to 1.5 MPa, more preferably 0.6 to 1.2 MPa, and most preferably 1 MPa; the coating time is preferably 20 to 300 s, more preferably 50 to 200 s, and most preferably 120 s. In the present invention, the second coating method is preferably spraying, and the spraying is preferably performed by a spray gun. The present invention has no special requirements for the specific implementation process of the spraying.

[0049] After obtaining the silicon dioxide modified wet fabric, the silicon dioxide modified wet fabric is dried to obtain the zero-gravity or anti-gravity leakage-proof fabric.

[0050] In the present invention, the drying temperature is preferably 45-60° C. The present invention has no special requirements on the drying time, which is until the drying reaches a constant weight.

[0051] The present invention provides a zero-gravity or anti-gravity leakage-proof fabric obtained by the preparation method described in the above technical solution, comprising a hydrophilic fabric layer and hydrophobic silica particles bonded to the hydrophilic fabric layer.

[0052] In the present invention, the particle size of the silicon dioxide is preferably ≤600 nm, more preferably 100 to 500 nm.

[0053] In the present invention, the zero-gravity or anti-gravity anti-leakage fabric has a hydrophobic-hydrophilic gradient structure from the surface to the inside, with hydrophobic silica particles on the surface and hydrophilic fibers on the inner layer. Moreover, as the depth changes from the surface to the inside, the density of the silica particles decreases continuously, and the silica particles on the surface are the densest, gradually changing from dense to sparse, forming capillary channels on the surface of the hydrophilic fabric to produce capillary phenomena, thereby realizing the penetration of surface liquid in the absence of gravity. At the same time, the outermost layer of the hydrophilic fabric is a hydrophobic layer formed by hydrophobic and dense silica particles, which effectively prevents the liquid entering the hydrophilic fibers from undergoing reverse osmosis.

[0054] The present invention provides the use of the zero-gravity or anti-gravity leakage-proof fabric described in the above technical solution in disposable sanitary products for absorbing human secretions.

[0055] In the present invention, the application is preferably used as a diversion layer fabric for disposable sanitary products for human secretions, and the sanitary products for human secretions preferably include female menstrual sanitary products and / or excrement sanitary products, specifically including sanitary napkins, diapers or diapers.

[0056] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0057] Example 1

[0058] Prepare a 20 wt% PU aqueous solution, mix silica and ethanol ultrasonically at room temperature for 3 hours to obtain a 2 g / L silica suspension, and put them into a spray gun for later use;

[0059] Spray PU aqueous solution on hot air nonwoven fabric, the spraying distance is 20cm, the spraying pressure is 0.5MPa, the spraying time is 20s, and the spraying volume is 0.5L / m 2 , obtaining a modified nonwoven fabric;

[0060] The silica suspension was sprayed on the modified nonwoven fabric at a spraying distance of 20 cm, a spraying pressure of 0.5 MPa, a spraying time of 20 s, and a spraying volume of 0.2 L / m 2 , obtaining a silica-modified nonwoven fabric;

[0061] The silica modified nonwoven fabric is dried at 50° C. to a constant weight to obtain a zero-gravity or anti-gravity anti-leakage fabric.

[0062] Figure 2 : is an electron microscope photograph of the hydrophilic fabric substrate of Example 1 of the present invention; Figure 3 This is an electron microscope photo of the product prepared in Example 1 of the present invention; Figure 2 and Figure 3 It can be seen that the surface of the hydrophilic fiber in the non-woven fabric is smooth before spraying, and the surface of the zero-gravity or anti-gravity leakage-proof fabric fiber obtained by two sprayings has a rough surface with silica particles loaded on the surface. The surface silica is successfully loaded on the surface of the fabric, forming a hydrophobic-hydrophilic gradient structure, which enables the penetration of surface liquid in the absence of gravity.

[0063] Example 2

[0064] Prepare a 25 wt% PU aqueous solution, mix silica and ethanol ultrasonically at room temperature for 4 hours to obtain a 3 g / L silica suspension, and put them into a spray gun for later use;

[0065] according to Figure 1 The process shown is to spray PU aqueous solution on cotton fabric with a spraying distance of 25 cm, a spraying pressure of 0.5 MPa, a spraying time of 20 s, and a spraying volume of 0.5 L / m 2 , obtaining a modified nonwoven fabric;

[0066] The silica suspension was sprayed on the modified nonwoven fabric at a spraying distance of 25 cm, a spraying pressure of 1.5 MPa, a spraying time of 180 s, and a spraying volume of 0.2 L / m 2 , obtaining a silica-modified nonwoven fabric;

[0067] The silica modified nonwoven fabric is dried at 50° C. to a constant weight to obtain a zero-gravity or anti-gravity anti-leakage fabric.

[0068] Example 3

[0069] Prepare a 40 wt% PU aqueous solution, mix silica and ethanol ultrasonically at room temperature for 5 hours to obtain a 4 g / L silica suspension, and put them into a spray gun for later use;

[0070] according to Figure 1 The process shown is to spray PU aqueous solution on cotton fabric with a spraying distance of 30 cm, a spraying pressure of 1 MPa, a spraying time of 300 s, and a spraying volume of 0.5 L / m 2 , obtaining a modified nonwoven fabric;

[0071] Spray the silica suspension on the modified nonwoven fabric at a spraying distance of 30 cm, a spraying pressure of 1 MPa, a spraying time of 300 s, and a spraying volume of 0.2 L / m 2 , obtaining a silica-modified nonwoven fabric;

[0072] The silica modified nonwoven fabric is dried at 50° C. to a constant weight to obtain a zero-gravity or anti-gravity anti-leakage fabric.

[0073] Example 4

[0074] Prepare a 50 wt% PU aqueous solution, mix silica and ethanol ultrasonically at room temperature for 3 hours to obtain a 3 g / L silica suspension, and put them into a spray gun for later use;

[0075] according to Figure 1 The process shown is to spray PU aqueous solution on cotton fabric with a spraying distance of 25 cm, a spraying pressure of 1.5 MPa, a spraying time of 20 seconds, and a spraying volume of 0.5 L / m 2 , obtaining a modified nonwoven fabric;

[0076] Spray the silica suspension on the modified nonwoven fabric at a spraying distance of 25 cm, a spraying pressure of 1.5 MPa, a spraying time of 20 s, and a spraying volume of 0.2 L / m 2 , obtaining a silica-modified nonwoven fabric;

[0077] The silica modified nonwoven fabric is dried at 50° C. to a constant weight to obtain a zero-gravity or anti-gravity anti-leakage fabric.

[0078] Test Example 1

[0079] The line roughness curves of the hydrophilic fabric substrate and the product of Example 1 were tested and photographed using an electron microscope and a laser scanning confocal microscope. The results were as follows: Figures 2 to 7 ;Depend on Figures 2 to 7 It can be concluded that the surface of the untreated fabric is smooth, the surface contour is relatively flat and there is no fluorescent coating; after spraying, the fabric surface has silica nanoparticles, is relatively rough, the line roughness curve changes significantly, and there is a thin layer of fluorescent indicator coating, which is the spray coating.

[0080] Test Example 2

[0081] The product prepared in Example 1 was subjected to liquid absorption experiments under gravity and anti-gravity conditions. Figure 8 The liquid absorption process of the product prepared in the embodiment of the present invention under the action of gravity; Figure 9 The liquid absorption process of the product prepared in Example 1 of the present invention under anti-gravity; Figure 8 and Figure 9 It can be concluded that the water permeability of the product prepared in the embodiment of the present invention is not much different whether under gravity or counter-gravity, indicating that the force for water permeation of the product of Example 1 mainly comes from the attraction caused by the hydrophilic and hydrophobic gradient inside the product, whether under gravity or counter-gravity.

[0082] Figure 10 These are the experimental results of water permeability and water resistance to liquids in the positive and negative phases under gravity for the product prepared in Example 1 of the present invention. The water permeability experiment shows that water can pass through the fabric in the positive direction, and water accumulation can be seen inside the fabric. The negative phase water resistance experiment shows that under the action of gravity, water can only stay on the negative phase surface of the fabric and cannot pass through the fabric.

[0083] Figure 11 This is a comparison of the side view and bottom view of the product prepared in Example 1 of the present invention under the action of anti-gravity; it can be seen from the side view that the water droplets pass from bottom to top on the fabric and reach the inside of the hydrophilic fibers; it can be seen from the bottom view that due to the effect of anti-gravity adsorption, water gradually penetrates the fabric and the wetting area increases; therefore, under the condition of anti-gravity, the product prepared in the embodiment can adsorb liquid.

[0084] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for preparing a zero-gravity or anti-gravity anti-leakage fabric, comprising the following steps: A polyurethane aqueous solution is coated on the surface of a hydrophilic fabric substrate to improve the bonding ability of the hydrophilic fiber surface to obtain a surface-modified fabric. The mass percentage of the polyurethane aqueous solution is 20-50 wt.%, and the coating amount of the polyurethane aqueous solution is 0.1-0.5 L / m 2 ; The surface of the surface-modified fabric is coated with a silica suspension and then dried, and hydrophobic silica particles are bonded to the surface of the hydrophilic fiber to form a hydrophobic-hydrophilic gradient structure from the surface to the inside on the surface of the hydrophilic fabric substrate, thereby obtaining the zero-gravity or anti-gravity anti-seepage fabric. The zero-gravity or anti-gravity anti-seepage fabric comprises a hydrophilic fabric and hydrophobic silica particles bonded to the hydrophilic fabric. The mass concentration of the silica suspension is 2-4 g / L, the particle size of the silica in the silica suspension is 100-500 nm, and the coating amount of the silica suspension is 0.01-0.2 L / m 2 .

2. The preparation method according to claim 1, wherein The method for coating the polyurethane aqueous solution and the silica suspension is spraying. The coating distance when spraying the polyurethane aqueous solution and the silica suspension is independently 20-30 cm, the coating pressure is independently 0.5-1.5 MPa, and the coating time is independently 20-300 s.

3. The preparation method according to claim 1, wherein The drying temperature is 45-60°C.

4. The zero-gravity or anti-gravity leakage-proof fabric obtained by the preparation method according to any one of claims 1 to 3, comprising a hydrophilic fabric and hydrophobic silica particles bonded to the hydrophilic fabric.

5. Use of the zero-gravity or anti-gravity leakage-proof fabric according to claim 4 in disposable sanitary products for absorbing human secretions.

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