Preparation method of bionic drag-reducing swimsuit fabric

Abstract

The present invention discloses a preparation method of a bionic drag-reducing swimsuit fabric, belonging to the field of fabric preparation technology, including a preparation process, a bionic drag-reducing swimsuit fabric prepared by the preparation process, and a drag-reducing post-treatment process. In the present invention, through the combination of a laminated knitting structure and a connection structure, the combination of a 1+1 rib stitch and the knitting configuration of yarns cause the laminated knitting structures to cover and fold each other to form a fish-scale-like three-dimensional structure, and the staggered fish-scale-like three-dimensional structures form a structure imitating a V shape. When the surface of the bionic drag-reducing swimsuit fabric contacts water and swims, the water flow always follows the same direction, reducing the frictional resistance suffered by the bionic drag-reducing swimsuit fabric when swimming in water. Through the finishing of the bionic drag-reducing swimsuit fabric with a drag-reducing finishing liquid, a flexible film layer is formed on the surface of the bionic drag-reducing swimsuit fabric, controlling the transition of the boundary layer between the water flow and the surface of the bionic drag-reducing swimsuit fabric, and effectively reducing the flow frictional resistance at the solid-liquid interface.

Description

Technical Field

[0001] The present invention discloses a fabric preparation process, in particular, a preparation method for a bionic drag-reducing swimsuit fabric. Background Art

[0002] In the competitive swimming races where speed is crucial, in order to further break speed records, the improvement of swimmers' techniques and physical strength is the most important factor. However, reducing the water resistance of swimsuits in swimming competitions has also become an important issue. Therefore, the improvement of fabrics for swimsuits has been ongoing.

[0003] The resistance of water is approximately 800 times that of air. Therefore, compared with land sports events, it is extremely difficult to reduce resistance in water. For swimmers with the same body shape and driving force in a 100m freestyle race, if the water resistance to the human body is reduced by 10%, the time taken to swim 100m can be shortened by 0.15s, leading the opponent by 30cm in distance. Therefore, swimsuits that can reduce resistance can improve the performance of swimmers. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation method for a bionic drag-reducing swimsuit fabric to solve the above problems.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A preparation method for a bionic drag-reducing swimsuit fabric, including a preparation process, a bionic drag-reducing swimsuit fabric prepared by the preparation process, and a drag reduction post-treatment process. The bionic drag-reducing swimsuit fabric includes a laminated knitting structure and a connection structure. The preparation process includes the following steps:

[0006] S1, The bionic drag-reducing swimsuit fabric is knitted with three kinds of yarns, namely PVA yarn, nylon-ammonia core-spun yarn, and polyester yarn, and knitted with a 14-needle double-bed flat knitting machine. The knitting yarn nozzles used are No. 1 nozzle and No. 6 nozzle. The No. 1 nozzle is threaded with polyester yarn, and the No. 6 nozzle is a double-yarn nozzle with upper and lower threading holes. The nylon-ammonia core-spun yarn and PVA yarn are fed into the same port of the No. 6 nozzle and respectively pass through the upper and lower ports of the No. 6 nozzle. The knitting course number of the connection structure is 13 courses, and the knitting course number of the laminated knitting structure is 15 courses;

[0007] S2, When starting to knit the bionic drag-reducing swimsuit fabric, first knit the connection structure, and then knit the laminated knitting structure. The connection structure and the laminated knitting structure are knitted alternately in a cycle. When knitting the connection structure to the row before the edge of the bottom cloth, do not cast off the loops. The laminated knitting structure uses the front bed and the back bed to jointly knit a 1+1 rib stitch. When knitting the laminated knitting structure, the front bed and the back bed separately knit the connection points between the laminated knitting structures. There is a connection between the horizontal connection of adjacent laminated knitting structures and the non-cast-off horizontal row of loops of the connection structure;

[0008] S3. After the connection structure and the laminated knitting structure in one horizontal row are knitted to complete a cycle, start knitting the connection structure again from the next horizontal row, and the coils of the connection structure in this cycle are threaded through the un-dropped coils of the connection structure in the previous cycle. The un-dropped coils of the connection structure in the previous cycle are completely connected to the coils of the connection structure in the next cycle by partial tuck stitches. The laminated knitting structure tightens after being connected by coils between adjacent two longitudinal connection structures to form a laminated structure with each other. The coils of the connection structure shrink to serve as the base fabric of the bionic drag-reducing swimsuit fabric.

[0009] Perform a drag-reducing post-treatment process on the prepared bionic drag-reducing swimsuit fabric. The drag-reducing post-treatment process includes the following steps:

[0010] A1. Prepare a drag-reducing finishing solution. According to the following mass parts: Put 10 parts of polyvinyl alcohol solid and 90 parts of distilled water into a magnetic stirring tank, and magnetically stir and mix them evenly in a water bath at 75 °C for 1 h to obtain a polyvinyl alcohol solution with a mass fraction of 10%. During the stirring and mixing process, add 0 - 3 parts of sodium alginate and 0 - 8 parts of hydroxypropyl methylcellulose; after standing the polyvinyl alcohol solution to cool to room temperature, add 0.1 part of glutaraldehyde and magnetically stir evenly for 2 min; after the polyvinyl alcohol solution and glutaraldehyde are fully mixed, add 1 part of 1.2 mol / L hydrochloric acid solution and magnetically stir evenly for 2 min to obtain a drag-reducing finishing solution;

[0011] A2. Finish the bionic drag-reducing swimsuit fabric with the drag-reducing finishing solution. Add 0.04 part of photoinitiator 1173 to the drag-reducing finishing solution. Immerse the bionic drag-reducing swimsuit fabric in the drag-reducing finishing solution for 15 s. After taking out the bionic drag-reducing swimsuit fabric, pad the bionic drag-reducing swimsuit fabric through a padding mangle to obtain a bionic drag-reducing swimsuit fabric with a liquor pick-up rate of 70%. Put the padded bionic drag-reducing swimsuit fabric into an oven, dry it at 90 °C for 5 min, and then expose it under an ultraviolet lamp with a wavelength of 365 nm and a power of 30 w for 2 min to obtain the bionic drag-reducing swimsuit fabric with drag-reducing finishing.

[0012] Preferably, 1 part and 6 parts of sodium alginate and hydroxypropyl methylcellulose are respectively used.

[0013] Preferably, the knitting horizontal density and knitting vertical density of the bionic drag-reducing swimsuit are respectively 7.5 rows / cm and 11 columns / cm, and the yarn length is 9 cm / 50 needles.

[0014] Preferably, the laminated knitting structure and the connection structure are combined on the bionic drag-reducing swimsuit fabric to form a three-dimensional structure in the shape of fish scales.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] First, through the combination of the stacked weaving structure and the connection structure, the combination of the 1+1 rib structure and the yarn weaving configuration, and by virtue of the factor of the weaving height of the stacked weaving structure, the fabric will tighten after the adjacent two longitudinal connection structures are connected by coils, so that the stacked weaving structures cover and fold each other to form a fish-scale-like three-dimensional structure. The staggered fish-scale-like three-dimensional structure forms a structure imitating a V shape. When the surface of the bionic drag-reducing swimsuit fabric contacts the water and swims, the water flow always follows the same direction, reducing the frictional resistance suffered by the bionic drag-reducing swimsuit fabric when swimming in water;

[0017] Second, after being treated with the drag-reducing finishing liquid, a polymer chain porous structure with a flexible interpenetrating double-network layer structure composed of large pores and small pores and a flexible film layer with a rich and dense porous structure are formed on the surface of the bionic drag-reducing swimsuit fabric. This kind of structure can form a laminar flow structure between the surface of the bionic drag-reducing swimsuit fabric and the water, and change the turbulent flow structure flowing through the porous structure through the surface of the formed flexible film layer, controlling the transition of the boundary layer between the water flow and the surface of the bionic drag-reducing swimsuit fabric, and effectively reducing the flow frictional resistance at the solid-liquid interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a weaving diagram of the stacked weaving structure;

[0019] Figure 2 It is a preparation diagram of the connection structure;

[0020] Figure 3 It is a partial external view of the bionic drag-reducing swimsuit fabric;

[0021] Figure 4 It is a chart showing the influence of the drag-reducing finishing liquid prepared with different components on the drag reduction rate of the bionic drag-reducing swimsuit fabric. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] A preparation method of a bionic drag-reducing swimsuit fabric, including a preparation process, the bionic drag-reducing swimsuit fabric prepared by the preparation process, and a drag-reducing post-treatment process. The bionic drag-reducing swimsuit fabric includes a laminated weaving structure and a connection structure. The preparation process includes the following steps:

[0024] S1, The bionic drag-reducing swimsuit fabric is woven with three kinds of yarns, namely PVA yarn, nylon-ammonia core-spun yarn and polyester yarn, and is woven on a 14-needle double-needle bed flat knitting machine. The knitting yarn nozzles are No. 1 yarn nozzle and No. 6 yarn nozzle. The No. 1 yarn nozzle passes through the polyester yarn. The No. 6 yarn nozzle is a double-yarn nozzle with upper and lower threading holes. The nylon-ammonia core-spun yarn and the PVA yarn are fed into the same port of the No. 6 yarn nozzle and pass through the upper and lower ports of the No. 6 yarn nozzle respectively. The knitting course number of the connection structure is 13 courses, and the knitting course number of the laminated weaving structure is 15 courses;

[0025] S2, When starting to knit the bionic drag-reducing swimsuit fabric, first knit the connection structure, and then knit the laminated weaving structure. The connection structure and the laminated weaving structure are alternately and circularly knitted. The connection structure does not cast off loops in the previous row before reaching the edge of the bottom cloth. The laminated weaving structure uses the front needle bed and the rear needle bed to jointly knit a 1+1 rib structure. When knitting the laminated weaving structure, the front needle bed and the rear needle bed independently knit the connection points between the laminated weaving structures. There is a connection at the horizontal connection of adjacent laminated weaving structures and the non-cast-off horizontal row of coils of the connection structure;

[0026] S3, When a horizontal row of the connection structure and the laminated weaving structure is knitted and completed as a cycle, start knitting the connection structure again from the next horizontal row, and the connection structure of this cycle is threaded through the non-cast-off coils of the connection structure of the previous cycle. The non-cast-off coils of the connection structure of the previous cycle are completely connected to the coils of the connection structure of the next cycle by partial tuck stitches. The laminated weaving structures are tightened and form a laminated structure with each other after being connected by coils at adjacent two longitudinal connection structures. The coils of the connection structure shrink to form the bottom cloth of the bionic drag-reducing swimsuit fabric;

[0027] As Figure 1 shown is the knitting diagram of the connection structure from bottom to top for 1-13 courses. As Figure 2 shown is the knitting diagram of the laminated weaving structure from bottom to top for 14-28 courses. The combination of the laminated weaving structure and the connection structure forms a three-dimensional structure in the shape of fish scales on the bionic drag-reducing swimsuit fabric. Due to the factor of the knitting height of the laminated weaving structure, the fabric will be tightened after the adjacent two longitudinal connection structures are connected by coils, so that the laminated weaving structures cover and fold each other. As Figure 3As shown, since the number of coils at the transverse connection is less than the number of coils in the main part of the stacked braided structure, the stacked braided structure unit will shrink to form a fish scale-like three-dimensional structure. A single fish scale-like three-dimensional structure is composed of a connection structure and a stacked braided structure. The fish scale-like three-dimensional structures are arranged in a diamond shape and staggered. The staggered fish scale-like three-dimensional structures form a V-shaped structure and are arranged along the direction of the water flow, so that when the surface of the bionic drag-reducing swimsuit fabric contacts the water and swims, the water flow is always in the same direction, thereby reducing the friction resistance of the bionic drag-reducing swimsuit fabric when swimming in the water;

[0028] The prepared bionic drag-reducing swimsuit fabric is subjected to a drag-reducing post-treatment process, and the drag-reducing post-treatment process comprises the following steps:

[0029] A1, prepare a drag-reducing finishing liquid according to the following parts by mass: put 10 parts of polyvinyl alcohol solid and 90 parts of distilled water into a magnetic stirring tank, and stir and mix them at a constant speed under magnetic stirring for 1 hour in a 75°C water bath to obtain a polyvinyl alcohol solution with a mass fraction of 10%, and add 0-3 parts of sodium alginate and 0-8 parts of hydroxypropyl methylcellulose during the stirring and mixing process; after the polyvinyl alcohol solution is allowed to stand and cool to room temperature, 0.1 parts of glutaraldehyde are added and stirred at a constant speed under magnetic stirring for 2 minutes; after the polyvinyl alcohol solution and glutaraldehyde are fully mixed, 1 part of 1.2 mol / L hydrochloric acid solution is added and stirred at a constant speed under magnetic stirring for 2 minutes to obtain a drag-reducing finishing liquid;

[0030] A2, finishing of bionic drag reducing swimsuit fabric with drag reducing finishing liquid, adding 0.04 parts of photocuring agent 1173 to the drag reducing finishing liquid, immersing the bionic drag reducing swimsuit fabric in the drag reducing finishing liquid for 15 seconds, taking out the bionic drag reducing swimsuit fabric, and padding the bionic drag reducing swimsuit fabric with a liquid carrying rate of 70%, placing the bionic drag reducing swimsuit fabric after padding in an oven, drying it at 90°C for 5 minutes, and then exposing it to an ultraviolet lamp with a wavelength of 365nm and a power of 30W for 2 minutes to obtain the bionic drag reducing swimsuit fabric with drag reducing finishing;

[0031] After being finished with the drag-reducing finishing liquid, the -OH groups in the polyvinyl alcohol polymer solution in the drag-reducing finishing liquid are cross-linked with the -CHO in glutaraldehyde, and partially cross-linked with the PVA yarn in the bionic drag-reducing swimsuit fabric, forming a flexible interpenetrating double-mesh structure of polymer chains composed of large pores and small pores. The large pores and small pores are evenly distributed, and a flexible membrane layer with a rich and dense porous structure is formed on the surface of the bionic drag-reducing swimsuit fabric. This structure can form a laminar structure between the surface of the bionic drag-reducing swimsuit fabric and water, and the turbulent structure of the flow passing through the porous structure is changed through the formed flexible membrane layer surface, thereby controlling the transition of the boundary layer between the water flow and the surface of the bionic drag-reducing swimsuit fabric, and effectively reducing the flow friction resistance at the solid-liquid interface.

[0032] The parameters of the drag reduction finishing liquid prepared by changing only the components of sodium alginate and hypromellose in 5 different schemes are as follows:

[0033] ①: 0 parts of sodium alginate; 0 parts of hypromellose;

[0034] ②: 1 part of sodium alginate; 0 parts of hypromellose;

[0035] ③: 2 parts of sodium alginate; 0 parts of hypromellose;

[0036] ④: 1 part of sodium alginate; 6 parts of hypromellose;

[0037] ⑤: 1 part of sodium alginate; 8 parts of hypromellose;

[0038] As Figure 4 shown in the chart of the influence of the drag reduction finishing liquid prepared by different components on the drag reduction rate of the bionic drag reduction swimsuit fabric, the test was carried out by intercepting a 10×10 cm sized bionic drag reduction swimsuit fabric and placing it in water with a flow rate of 5 m / s for 2 h to measure the drag reduction rate. It can be seen from ①, ②, and ③ that as the sodium alginate component increases, the drag reduction rate first increases and then decreases. This is because when the sodium alginate is excessive, sodium alginate will hinder the formation of the porous structure of the polymer chain, making it difficult for the film layer to adhere to the surface of the bionic drag reduction swimsuit fabric and for the porous structure to form. It can be seen from ②, ④, and ⑤ that as the hypromellose component increases, the drag reduction rate first increases and then decreases. This is because an appropriate amount of hypromellose has a greater storage modulus and surface energy, enabling the film layer to better adhere to the surface of the bionic drag reduction swimsuit fabric. However, when it is excessive, it will cause the adhesion strength between the film layers to be too large and hinder the formation of the porous structure. In summary, 1 part of sodium alginate and 6 parts of hypromellose in ④ are selected.

[0039] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0040] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a bionic drag-reducing swimsuit fabric, characterized in that: The invention comprises a preparation process, a bionic drag-reducing swimsuit fabric prepared by the preparation process, and a drag-reducing post-treatment process, wherein the bionic drag-reducing swimsuit fabric comprises a stacked woven structure and a connection structure, and the preparation process comprises the following steps: S1, bionic drag-reducing swimsuit fabric is woven with three kinds of yarns, namely PVA yarn, nylon-spandex core-spun yarn and polyester yarn, and is woven on a 14-needle double-needle bed flat knitting machine. The knitting yarn mouths are No. 1 yarn mouth and No. 6 yarn mouth. The No. 1 yarn mouth is threaded with polyester yarn, and the No. 6 yarn mouth is a double yarn mouth with upper and lower threading holes. The nylon-spandex core-spun yarn and PVA yarn are introduced from the same opening of the No. 6 yarn mouth and passed through the upper and lower openings of the No. 6 yarn mouth respectively. The number of knitting paths of the connection structure is 13, and the number of knitting paths of the stacked knitting structure is 15; S2, the bionic drag-reducing swimsuit fabric is firstly woven by weaving the connection structure, and then the stacked woven structure is woven. The connection structure and the stacked woven structure are woven alternately and cyclically. The connection structure does not fall off when it is woven to the previous row at the edge of the base fabric. The stacked woven structure uses the front needle bed and the rear needle bed to weave a 1+1 rib structure together. When weaving the stacked woven structure, the front needle bed and the rear needle bed separately weave the connection points between the stacked woven structures, and the lateral connection between adjacent stacked woven structures is connected to a horizontal row of coils of the connection structure that has not fallen off. S3, when the connection structure and the stacked braided structure of one horizontal row are woven as a cycle, the connection structure is woven again from the next horizontal row, and the connection structure of this cycle is interlaced with the coils of the connection structure of the previous cycle that have not been unhooked, and the coils of the connection structure of the previous cycle that have not been unhooked are completely connected with the coils of the connection structure of the next cycle by partial tucking, and the stacked braided structure is tightened to form a stacked structure after two adjacent longitudinal connection structures are connected by coils, and the coils of the connection structure are contracted to serve as the base fabric of the bionic drag-reducing swimsuit fabric; The prepared bionic drag-reducing swimsuit fabric is subjected to a drag-reducing post-treatment process, and the drag-reducing post-treatment process comprises the following steps: A1, prepare a drag-reducing finishing liquid according to the following parts by mass: put 10 parts of polyvinyl alcohol solid and 90 parts of distilled water into a magnetic stirring tank, and stir and mix them at a constant speed under magnetic stirring for 1 hour in a 75°C water bath to obtain a polyvinyl alcohol solution with a mass fraction of 10%, and add 0-3 parts of sodium alginate and 0-8 parts of hydroxypropyl methylcellulose during the stirring and mixing process; after the polyvinyl alcohol solution is allowed to stand and cool to room temperature, 0.1 parts of glutaraldehyde are added and stirred at a constant speed under magnetic stirring for 2 minutes; after the polyvinyl alcohol solution and glutaraldehyde are fully mixed, 1 part of 1.2 mol / L hydrochloric acid solution is added and stirred at a constant speed under magnetic stirring for 2 minutes to obtain a drag-reducing finishing liquid; A2, finishing of bionic drag reducing swimsuit fabric with drag reducing finishing liquid, adding 0.04 parts of photocuring agent 1173 to the drag reducing finishing liquid, immersing the bionic drag reducing swimsuit fabric in the drag reducing finishing liquid for 15 seconds, taking out the bionic drag reducing swimsuit fabric, and rolling the bionic drag reducing swimsuit fabric through a padding machine to obtain a bionic drag reducing swimsuit fabric with a liquid carrying rate of 70%, placing the rolled bionic drag reducing swimsuit fabric in an oven and drying it at 90°C for 5 minutes, and then exposing it to an ultraviolet lamp with a wavelength of 365nm and a power of 30W for 2 minutes to obtain the bionic drag reducing swimsuit fabric with drag reducing finishing.

2. The method for preparing a bionic drag-reducing swimsuit fabric according to claim 1, characterized in that: The sodium alginate and hypromellose are used in 1 part and 6 parts respectively.

3. The method for preparing a bionic drag-reducing swimsuit fabric according to claim 1, characterized in that: The bionic drag-reducing swimsuit has a horizontal knitting density and a vertical knitting density of 7.5 rows / cm and 11 columns / cm respectively, and a thread length of 9 cm / 50 stitches.

4. A method for preparing a bionic drag-reducing swimsuit fabric according to any one of claims 1 to 3, characterized in that: The stacked braided structure and the connection structure are combined on the bionic drag-reducing swimsuit fabric to form a three-dimensional structure in the shape of fish scales.

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