Liquid-fluid flexible linear material and composite yarn forming method and application thereof

Abstract

The present invention provides a liquid-fluid flexible linear material and a composite yarn forming method and application thereof. The liquid-fluid flexible linear material is a core-sheath composite structure, including a liquid-fluid material as a core layer, a film layer encapsulating the liquid-fluid material, and a flexible strip as a sheath layer that wraps around the film layer and wraps around the outer side of the film layer. The method provided by the present invention solves the technical problem that liquid-fluid cannot be combed and drawn into yarn, and provides a quick and effective method for making enhanced impact protection yarn and clothing fabrics from liquid-fluid materials.

Description

Technical Field

[0001] The invention relates to the technical field of textile materials, and in particular to a liquid-fluid flexible linear material and a composite yarn forming method and application thereof. Background Art

[0002] Impact phenomenon is one of the most common phenomena in the field of structural protection engineering. Composite materials are widely used in engineering protection, aerospace, military weapons and automobile manufacturing due to their excellent properties such as light weight, high specific strength, high specific modulus, and strong impact and ballistic resistance.

[0003] Due to the prevalence of impact injuries, the design of safety protection materials is becoming increasingly important. Shear thickening fluids are widely used in impact-resistant clothing in various fields. Shear thickening fluid materials are used in human protective equipment, which can greatly increase the protective ability while reducing the material weight, and improve the flexibility and comfort of human protective materials. Compared with traditional protective materials, shear thickening liquid soft composite materials meet the contradiction between protective performance and flexibility and comfort. Shear thickening fluid causes the viscosity of the system to increase sharply in an instant when the material is subjected to external high-speed impact, consuming a large amount of external impact energy, providing better safety protection for various sports. When the external force is removed, the material returns to a soft state, greatly improving the impact resistance and comfort of the protective product.

[0004] However, current civilian impact-resistant clothing and accessories are usually hard shell products that restrict human movement and are neither flexible nor comfortable. In particular, flexible polyurethane foam cushioning materials have poor thermal and wet comfort. Shear thickening liquids are difficult to compound into yarns and cannot be spun into flexible cloth-like structures. In addition, the uniform dispersion and stable bonding of the shear thickening liquid cannot be guaranteed, resulting in a decrease in the impact resistance of the shear thickening liquid itself.

[0005] In the prior art, a commonly used method is to directly immerse the protective textile in a mixture of a shear thickening fluid and a diluent solvent, and then dry and remove the diluent solvent to obtain a mixture of the shear thickening fluid and the textile. Although this can enhance the impact resistance of the textile to a certain extent, there is a technical defect that the finished product is not wear-resistant and breathable.

[0006] Therefore, there is an urgent need to develop a continuous manufacturing method to manufacture materials that have both super-strong and long-lasting impact resistance and moisture permeability / breathability / soft wearing comfort, so as to realize the transformation of shear thickening materials from sheet materials to yarns and fabric textile materials to serve the needs of military and aerospace industries. Summary of the invention

[0007] The object of the present invention is to provide a liquid-fluid flexible linear material and a composite yarn forming method and application thereof.

[0008] In order to achieve the above-mentioned purpose of the invention, the present invention provides a liquid-fluid flexible linear material, which is a core-sheath multilayer composite structure, including a liquid-fluid material as a core layer, a thin film layer that encapsulates the liquid-fluid material, and a flexible strip that serves as a sheath layer and wraps around the thin film layer and wraps around the outside of the thin film layer.

[0009] As a further improvement of the present invention, in the liquid-fluid flexible linear material, the weight content of the liquid-fluid material reaches 50% or more.

[0010] As a further improvement of the present invention, the liquid-fluid flexible linear material further includes a fiber layer coated on the outside of the flexible strip.

[0011] As a further improvement of the present invention, the fiber layer is a mixture of one or more of aramid fiber, polyimide fiber, flame retardant viscose, flame retardant nylon, flame retardant polyester, flame retardant acrylic fiber, and seaweed fiber.

[0012] As a further improvement of the present invention, the flexible strip is a mixture of one or more high-strength and high-sealing films such as polyethylene film, polytetrafluoroethylene film, polyimide film, PET film, and PU film;

[0013] The total fineness of the flexible strip and the fiber layer is 100-5010 tex.

[0014] As a further improvement of the present invention, the liquid fluid material is a shear thickening fluid.

[0015] As a further improvement of the present invention, the liquid fluid material is one of a nanoparticle / polymer suspension system (mainly including silica particles, polyvinyl chloride particles, calcium carbonate particles, polymethyl methacrylate particles, carbon nanofibers, titanium dioxide particles, etc. as dispersed phases, and STF with polymer as dispersion medium), a polymer solution system formed by polymerization of long-chain polymers (mainly including hydrophobic associating polymers and polymers in poor solvents).

[0016] As a further improvement of the present invention, the liquid fluid material is one of STF and natural starch solution.

[0017] As a further improvement of the present invention, the liquid fluid material is one of a pure solution fluid material, a liquid / gas mixed liquid fluid material, and a liquid / solid mixed liquid fluid material.

[0018] As a further improvement of the present invention, the film layer is a mixture of one or more of polyethylene film, polytetrafluoroethylene film and polyurethane film.

[0019] To achieve the above-mentioned object of the invention, the present invention also provides a liquid-fluid composite yarn forming method, comprising the following steps:

[0020] S1, using a freezing treatment to convert the liquid fluid material into a solid fluid material, and then performing a roller pressing treatment to obtain a sheet film material;

[0021] S2, laminating the sheet film material to form a composite film material for thin film packaging;

[0022] S3, performing secondary freezing treatment on the composite membrane material, and then shearing the composite membrane material to obtain composite membrane strips;

[0023] S4, compounding the composite membrane filaments and the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments to prepare a liquid-fluid flexible linear material.

[0024] As a further improvement of the present invention, step S4 also includes: using a short fiber coating spinning method to comb the short fiber strips into single fibers and then coating the single fibers on the outer surface of the flexible strip sheath layer.

[0025] As a further improvement of the present invention, the temperature of the first freezing treatment is -5°C to -20°C.

[0026] As a further improvement of the present invention, the temperature of the second freezing treatment is -5°C to -20°C.

[0027] In order to achieve the above-mentioned purpose of the invention, the present invention also provides a preparation device for liquid-fluid flexible linear materials, including a roller for rolling the solid fluid material after freezing treatment, a coating roller portion for encapsulating a film on the surface of the solid fluid material, a refrigeration portion connected to the coating roller portion, and a wing spindle winding machine.

[0028] As a further improvement of the present invention, the preparation device further comprises a shearing section connected to the refrigeration section, and a strip spinning section and a friction spinning machine connected in sequence to the wing spindle winding machine;

[0029] The film coating roller part includes a pair of flexible film cylinders symmetrically arranged on the upper and lower surfaces of the solid fluid material, and a guide roller for film coating and packaging processing;

[0030] The refrigeration unit is a semiconductor refrigeration sheet symmetrically arranged up and down, which is used for performing secondary freezing treatment on the composite film material after film packaging.

[0031] In order to achieve the above-mentioned purpose of the invention, the present invention also provides the application of the above-mentioned liquid-fluid flexible linear material in the field of protective textiles.

[0032] The beneficial effects of the present invention are:

[0033] 1. The liquid-fluid flexible linear material provided by the present invention has adjustable fineness and a liquid-fluid content of more than 50%. Through the design of the core-sheath multilayer composite structure, the flexible strips and short fiber materials are sequentially coated on the liquid-fluid surface after film encapsulation to construct a moisture-permeable / breathable / soft / durable leak-proof impact-resistant functional liquid-fluid composite yarn. Among them, the core layer shear thickening liquid demonstrates the ability to resist impact deformation damage, the middle film layer shows excellent airtightness and strong bonding force, the sheath layer fiber coating layer demonstrates interception and barrier impact damage resistance, and the multilayer structure is mutually composited and synergistic, thereby demonstrating excellent superimposed high impact protection capabilities, so it is expected to be applied to the field of human emergency protection.

[0034] 2. The composite yarn forming method of the liquid-fluid flexible linear material provided by the present invention adopts a two-step refrigeration (freezing) technology, firstly freezes the shear thickening material once, and after roller extrusion, it is transformed from a fluid into a solid sheet material, and a film is covered on the upper and lower surfaces of the sheet shear thickening material before shearing to avoid adhesion to the shear roller while achieving sealing and leakproofing. The packaged material can supply multiple groups of linear material packages at the same time after shearing; the linear material formed after shearing is twisted and wound to achieve the coating of the fluid linear material by the flexible strip, so as to prepare the liquid-fluid flexible linear material. In this way, the twisting force and the pulling force make the flexible strip and the linear material of the built-in fluid material wrap and embrace while always maintaining uniform distribution, successfully compounding the fluid material into yarn, and breaking through the technical bottleneck that the liquid-fluid material is difficult to comb into yarn. The roller adjustment shaft and the shear adjustment roller can produce a variety of fluid linear materials of different thicknesses by adjusting the distance between the rollers and the shear rollers, so as to make yarns and fabrics required for different occasions.

[0035] 3. The composite yarn-forming method of the liquid-fluid flexible linear material provided by the present invention adopts a short fiber coating spinning method to further coat various short fiber materials on the surface of the liquid-fluid composite yarn, and finally efficiently and quickly prepares moisture permeable / breathable / soft / durably leak-proof and impact-resistant functional liquid flow composite yarn. The liquid-fluid flexible linear material obtained in this way is easy to weave and form, realizing the built-in short-process yarn-forming of the fluid material. The yarn is a unique core-sheath composite yarn, thereby solving the technical limitation of the prior art that "civilian impact-resistant clothing and accessories are usually hard shell products, which restrict the movement of the human body and are neither flexible nor comfortable. In particular, the flexible polyurethane foam cushioning material has poor thermal and wet comfort". It provides a quick and effective way to make enhanced impact protection yarns and clothing fabrics from fluid materials.

[0036] 4. The composite yarn-forming method of liquid-fluid flexible linear materials provided by the present invention utilizes conventional spinning devices, designs and regulates the structure of the yarn, and successfully composites the fluid material into yarn, thereby obtaining a composite material having the appearance of a staple yarn and the strength of a strip-wrapped flexible wire material. The composite material is not only easy to process and shape for textiles, but also gives the textile device product a protective function. The entire process is simple to operate and easy to promote and apply, which is of great significance to the development and application of fluid composite textile materials. The present invention breaks the technical bottleneck that liquid-fluid materials cannot be formed into yarns, realizes the built-in short-process yarn-forming of fluid materials, and opens up a new way for the industrialized manufacture of impact-resistant protective yarns and fabrics that are both comfortable to wear and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the process flow of the composite yarn-forming method of the liquid-fluid flexible linear material provided by the present invention.

[0038] Figure 2 This is a schematic structural diagram of a device for preparing a liquid-fluid flexible linear material provided by the present invention.

[0039] Figure 3 This is a digital photo of the actual object of the liquid-fluid flexible linear material provided by the present invention.

[0040] Figure 4 This is a cross-sectional electron microscope image of the actual object of the liquid-fluid flexible linear material provided by the present invention (scale: μm).

[0041] Figure 5 This is an electron microscope image of the actual object of the liquid-fluid flexible linear material provided by the present invention (scale: μm).

[0042] Figure 6 A physical picture of a fabric made of the liquid-fluid flexible linear material provided by the present invention.

[0043] Figure 7 This is a step comparison diagram of the impact resistance effect of fabrics made of the liquid-fluid flexible linear material provided by the present invention.

[0044] Reference numerals

[0045] 1-roller; 2-roller adjustment shaft; 3-flexible film cylinder; 4-guide roller; 5-refrigeration part; 6-shear roller; 7-shear roller adjustment shaft; 8-first top hole; 9-first side hole; 10-first hollow arm; 11-palm pressure rod; 12-palm pressure blade; 13-bobbin. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0048] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0049] See also Figure 1 As shown, the present invention provides a composite yarn forming method of a liquid-fluid flexible linear material, comprising the following steps:

[0050] S1, using a freezing treatment to convert the liquid fluid material into a soft mud (solid) fluid material, and then rolling it to obtain a sheet film material;

[0051] S2, laminating the sheet film material to form a composite film material for thin film packaging;

[0052] S3, performing secondary freezing treatment on the composite membrane material, and then shearing the composite membrane material to obtain composite membrane strips;

[0053] S4, compounding the composite membrane filaments and the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments to prepare a liquid-fluid flexible linear material.

[0054] Preferably, step S4 further comprises: adopting a short fiber coating spinning method to comb the short fiber strips into single fibers and then coating the single fibers on the outer surface of the flexible strip sheath layer.

[0055] See also Figure 2 As shown, the present invention provides a preparation device for liquid-fluid flexible linear materials, which includes symmetrically arranged rollers 1, a roller adjustment shaft 2 for adjusting the distance between the rollers 1, a coating roller portion for encapsulating a thin film on the surface of a soft mud fluid material, a refrigeration portion 5 for performing secondary freezing treatment, a shearing portion connected to the refrigeration portion 5, a wing spindle packaging machine, and a strip spinning portion (not shown in the figure) and a friction spinning machine (not shown in the figure) which are sequentially connected to the wing spindle packaging machine.

[0056] Preferably, the coating roller portion comprises a pair of flexible film cylinders 3 symmetrically arranged on the upper and lower surfaces of the soft mud fluid material, and a guide roller 4 used for coating and packaging processing.

[0057] Preferably, the refrigeration unit 5 is a semiconductor refrigeration sheet symmetrically arranged up and down.

[0058] Preferably, the wing ingot winding machine includes a first top hole 8, a first side hole 9, a first hollow arm 10, a first palm pressing rod 11, a first palm pressing blade 12, and a first bobbin 13 of the rotating ingot wing.

[0059] Preferably, the strip spinning section is used to compound the composite membrane filaments with the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments. It includes: when the composite membrane filaments of the fluid material overlap with the flexible strips, the composite membrane filaments encapsulating the built-in fluid material are located in the middle of the flexible strips. Its mechanism of action is: through twisting force and pulling force, the flexible strips and the linear material (composite membrane filaments) of the built-in fluid material are wrapped and embraced while always maintaining uniform distribution, and the fluid material is successfully compounded into yarns.

[0060] Preferably, the friction spinning machine comprises: the liquid-fluid flexible linear material obtained in step S4 is placed on the bobbin support frame of the friction spinning machine by short fiber coating spinning, and then fed into the dust cage of the friction spinning machine, and short fiber strips are fed at the same time, which are combed and decomposed into single fibers, and then coated on the outer surface of the liquid-fluid flexible linear material, the combing roller speed of the friction spinning machine is 3000 rpm, and the friction roller speed is 2800 rpm, so as to obtain short fiber coated liquid-fluid composite yarn. It is used for adopting the short fiber coating spinning method, combing and decomposing the short fiber strips into single fibers, and then coating them on the outer surface of the sheath layer of the flexible strip.

[0061] Example 1

[0062] Based on the above-mentioned preparation device of liquid-fluid flexible linear material, embodiment 1 of the present invention provides a composite yarn forming method of liquid-fluid flexible linear material, comprising the following steps:

[0063] S1, using a freezing treatment to convert the liquid fluid material into a soft mud fluid material, and then performing a roller pressing treatment to obtain a sheet film material;

[0064] S2, laminating the sheet film material to form a composite film material for thin film packaging;

[0065] S3, performing secondary freezing treatment on the composite membrane material, and then shearing the composite membrane material to obtain composite membrane strips;

[0066] The specific process of the above steps is:

[0067] Preliminary preparation process: Place a flexible polytetrafluoroethylene film surface material with a surface density of 5 g / m2 on a cutting machine, cut it into flexible polytetrafluoroethylene film strips (width 12 mm) with a linear density of 50 g / km, and wind each flexible polytetrafluoroethylene film strip on a bobbin to form a flexible polytetrafluoroethylene film strip bobbin package to obtain a polytetrafluoroethylene film flexible film tube 3.

[0068] Preparation process: The shear thickening fluid (a nanoparticle / polymer suspension system composed of polyethylene glycol and silica particles, i.e., a liquid / solid mixed fluid) is cooled and frozen once (the freezing temperature is -10°C) to be transformed into a soft mud fluid material; the soft mud shear thickening fluid material is twisted and controlled to be uniformly fed into the upper roller 1, the roller adjustment shaft 2 is opened to adjust the distance between the two rollers to 2mm, and the polytetrafluoroethylene film flexible film cylinder 3 is then covered on the upper and lower surfaces of the soft mud shear thickening fluid sheet material through the action of the guide roller 4, and then fed into the middle of the semiconductor refrigeration sheet 5 for secondary freezing treatment (the freezing temperature is -10℃), the solidified shear thickening liquid fluid sheet material passes through the shear roller 6 in turn, and the shear roller adjusting shaft 7 is opened to adjust the distance between the two shear rollers to 0.5mm, so as to cut the shear thickening liquid fluid sheet material into shear thickening liquid fluid flat ribbon-like filaments. In order to prevent the incisions on both sides of the filaments from sticking, anti-sticking powder is coated on the shear rollers during the shearing process; then, it is transported to the wing billet winding machine, and then passes through the first top hole 8, the first side hole 9, the first hollow arm 10, the first pressing palm rod 11, and the first pressing palm leaf 12 of the rotating ingot wing of the wing billet winding machine in turn, and is wound onto the first bobbin 13, and finally, a linear bobbin package with built-in shear thickening liquid fluid material is formed, that is, a composite membrane filament.

[0069] The two-step refrigeration (freezing) technology is adopted, and after roller extrusion, the shear thickening material is transformed from a fluid into a solid, and a film is covered on the upper and lower surfaces of the sheet-like shear thickening material before shearing to avoid adhesion to the shear roller while achieving sealing and leak prevention. After shearing, the sheet-like material can supply multiple groups of linear material packages at the same time. The linear material formed after shearing is twisted and wound to achieve the coating of the fluid linear material by the flexible strip, and a liquid-fluid flexible linear material is prepared. In this way, the twisting force and the pulling force make the flexible strip and the linear material of the built-in fluid material entangled and embraced while always maintaining a uniform distribution, successfully compounding the fluid material into yarn, breaking through the technical bottleneck that liquid-fluid materials are difficult to comb into yarn.

[0070] S4, compounding the composite membrane filaments prepared above with the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments, and preparing a liquid-fluid flexible linear material.

[0071] The specific process of the above steps is:

[0072] A combination of a linear material bobbin package for forming a built-in shear thickening fluid material and a flexible film strip bobbin package is used, and the cut flexible strips and the obtained composite film filaments are overlapped by using a strip spinning technology, so that the flexible strips cover the sheet material encapsulating the built-in fluid material, and a film strip-coated fluid flexible linear composite material is obtained. Wherein, when the composite film filaments overlap with the flexible strips, the composite film filaments are located in the middle of the flexible strips, and the width of the flexible strips is greater than the circumference of the composite film filament tube, and a fluid flexible linear material is obtained.

[0073] As a further improvement of Example 1 of the present invention, the membrane-wrapped liquid-fluid flexible linear material is placed on a bobbin support frame of a friction spinning machine by short fiber-wrapped spinning, and then fed into the dust cage of the friction spinning machine, and short fiber strips are fed at the same time, and after being combed and decomposed into single fibers, they are coated on the outer surface of the membrane-wrapped liquid-fluid flexible linear composite material. Ultra-high molecular weight polyethylene filaments are wrapped around the outside of the yarn to achieve high strength and high wear resistance.

[0074] The fiber layer is flame-retardant fiber (55% flame-retardant nylon, 35% aramid 1313, 10% flame-retardant viscose); the flexible strip is a polytetrafluoroethylene film.

[0075] By using the short fiber coating spinning method, various short fiber materials are further coated on the surface of the liquid-fluid composite yarn, and finally, the moisture-permeable / breathable / soft / durable leak-proof impact-resistant functional liquid-fluid composite yarn is efficiently and quickly prepared. The flexible linear material of the liquid-fluid obtained in this way is easy to weave and form, realizing the built-in short-process yarn-forming of the fluid material, and the yarn is a unique core-sheath composite yarn. The core layer shear thickening liquid demonstrates the ability to resist impact deformation damage, the middle layer polytetrafluoroethylene film shows excellent airtightness and strong bonding force, and the coating layer fiber demonstrates interception barrier impact damage resistance, thereby demonstrating excellent superimposed high impact protection capabilities.

[0076] Therefore, if Figure 3-5 As shown, in Example 1, a liquid-fluid flexible linear material of a core-sheath multilayer composite structure is prepared, which includes a liquid-fluid material as a core layer, a film layer encapsulating the liquid-fluid material, a flexible strip as a sheath layer that wraps around the film layer and wraps around the outside of the film layer, and a fiber layer wrapped around the outside of the flexible strip. The total fineness of the flexible strip and the fiber layer is 5010 tex; and the liquid-fluid weight content is as high as 50% or more.

[0077] See also Figure 4 As shown, the core-sheath multilayer composite structure can be clearly seen. Figure 5 As shown, it can be seen that after the fiber layer is decomposed into single fibers by combing, it is coated on the outer surface of the flexible strip sheath layer.

[0078] See also Figure 6 As shown, the liquid-fluid flexible linear material prepared in Example 1 of the present invention is made into a textile, and its impact resistance when a weight of 100 g is dropped from a height of 20 cm is as follows: Figure 7 As shown, it can be seen that it has high impact protection capability.

[0079] Example 2

[0080] Based on the above-mentioned preparation device of liquid-fluid flexible linear material, embodiment 2 of the present invention provides a composite yarn forming method of liquid-fluid flexible linear material, comprising the following steps:

[0081] S1, using a freezing treatment to convert the liquid fluid material into a soft mud fluid material, and then performing a roller pressing treatment to obtain a sheet film material;

[0082] S2, laminating the sheet film material to form a composite film material for thin film packaging;

[0083] S3, performing secondary freezing treatment on the composite membrane material, and then shearing the composite membrane material to obtain composite membrane strips;

[0084] The specific process of the above steps is:

[0085] Preliminary preparation process: Place a flexible polyethylene film surface material with a surface density of 4 g / m2 on a cutting machine, cut it into flexible polyethylene film strips (width 10 mm) with a linear density of 45 g / km, and wind each flexible polyethylene film strip on a bobbin to form a flexible polyethylene film strip bobbin package to obtain a polyethylene film flexible film tube 3.

[0086] Preparation process: The shear thickening fluid (natural starch solution, i.e., pure solution fluid material) is cooled and frozen once (freezing temperature is -15°C) to be transformed into a soft mud fluid material; the soft mud shear thickening fluid material is twisted and evenly fed into the upper roller 1, the roller adjustment shaft 2 is opened to adjust the distance between the two rollers to 2mm, and the polyethylene film flexible film cylinder 3 is then covered on the upper and lower surfaces of the soft mud shear thickening fluid sheet material through the action of the guide roller 4, and then fed into the middle of the semiconductor refrigeration plate refrigeration part 5. After a secondary freezing treatment (freezing temperature is -10°C), the solidified shear thickening liquid fluid sheet material passes through the shear roller 6 in turn, and the shear roller adjustment shaft 7 is opened to adjust the distance between the two shear rollers to 0.5mm; then, it is transported to the wing billet winding machine, and then passes through the first top hole 8, the first side hole 9, the first hollow arm 10, the first pressing palm rod 11, and the first pressing palm leaf 22 of the rotating billet wing of the wing billet winding machine in turn, and is wound onto the first bobbin 13, and finally, a linear bobbin package with built-in shear thickening liquid fluid material is formed, that is, a composite membrane filament.

[0087] S4, compounding the composite membrane filaments prepared above with the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments, and preparing a liquid-fluid flexible linear material.

[0088] The specific process of the above steps is:

[0089] A combination of a linear material bobbin package for forming a built-in shear thickening fluid material and a flexible film strip bobbin package is used, and the cut flexible strips and the obtained composite film filaments are overlapped by using a strip spinning technology, so that the flexible strips cover the sheet material encapsulating the built-in fluid material, and a film strip-coated fluid flexible linear composite material is obtained. Wherein, when the composite film filaments overlap with the flexible strips, the composite film filaments are located in the middle of the flexible strips, and the width of the flexible strips is greater than the circumference of the composite film filament tube, and a fluid flexible linear material is obtained.

[0090] As a further improvement of Example 2 of the present invention, the membrane-wrapped liquid-fluid flexible linear material is placed on a bobbin support frame of a friction spinning machine by short fiber-wrapped spinning, and then fed into the dust cage of the friction spinning machine, and short fiber strips are fed at the same time, and after being combed and decomposed into single fibers, they are coated on the outer surface of the membrane-wrapped liquid-fluid flexible linear composite material. Glass fiber filaments are wrapped around the outside of the yarn to achieve high strength and high wear resistance.

[0091] The fiber layer is flame-retardant viscose fiber; the flexible strip is PET film.

[0092] Thus, Example 2 prepared a liquid-fluid flexible linear material of a core-sheath multilayer composite structure, which includes a liquid-fluid material as a core layer, a film layer encapsulating the liquid-fluid material, a flexible strip as a sheath layer that wraps around the film layer and wraps around the outside of the film layer, and a fiber layer wrapped around the outside of the flexible strip. The total fineness of the flexible strip and the fiber layer is 5010 tex.

[0093] Example 3

[0094] Based on the above-mentioned preparation device of liquid-fluid flexible linear material, embodiment 3 of the present invention provides a composite yarn forming method of liquid-fluid flexible linear material, comprising the following steps:

[0095] S1, using a freezing treatment to convert the liquid fluid material into a soft mud fluid material, and then performing a roller pressing treatment to obtain a sheet film material;

[0096] S2, laminating the sheet film material to form a composite film material for thin film packaging;

[0097] S3, performing secondary freezing treatment on the composite membrane material, and then shearing the composite membrane material to obtain composite membrane strips;

[0098] The specific process of the above steps is:

[0099] Preliminary preparation process: Place a flexible polyurethane film surface material with a surface density of 6 g / m2 on a cutting machine, cut it into flexible polyurethane film strips (width 15 mm) with a linear density of 55 g / km, and wind each flexible polyethylene film strip on a bobbin to form a flexible polyurethane film strip bobbin package to obtain a polyurethane film flexible film tube 3.

[0100] Preparation process: The shear thickening fluid (liquid / gas mixed fluid material) is cooled and frozen once (freezing temperature is -10°C) to transform it into a soft mud fluid material; the soft mud shear thickening fluid material is twisted and controlled to be evenly fed into the upper roller 1, the roller adjustment shaft 2 is opened to adjust the distance between the two rollers to 2mm, and the polyurethane film flexible film cylinder 3 is then covered on the upper and lower surfaces of the soft mud shear thickening fluid sheet material through the action of the guide roller 4, and then fed into the middle of the semiconductor refrigeration sheet refrigeration part 5, and then After a secondary freezing treatment (freezing temperature is -5°C), the solidified shear thickening liquid fluid sheet material passes through the shear roller 6 in turn, and the shear roller adjustment shaft 7 is opened to adjust the distance between the two shear rollers to 0.5mm; then, it is transported to the wing billet winding machine, and then passes through the first top hole 8, the first side hole 9, the first hollow arm 10, the first pressing palm rod 11, and the first pressing palm leaf 22 of the rotating ingot wing of the wing billet winding machine in turn, and is wound onto the first bobbin 13, and finally, a linear bobbin package with built-in shear thickening liquid fluid material is formed, that is, a composite membrane filament.

[0101] S4, compounding the composite membrane filaments prepared above with the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments, and preparing a liquid-fluid flexible linear material.

[0102] The specific process of the above steps is:

[0103] A combination of a linear material bobbin package for forming a built-in shear thickening fluid material and a flexible film strip bobbin package is used, and the cut flexible strips and the obtained composite film filaments are overlapped by using a strip spinning technology, so that the flexible strips cover the sheet material encapsulating the built-in fluid material, and a film strip-coated fluid flexible linear composite material is obtained. Wherein, when the composite film filaments overlap with the flexible strips, the composite film filaments are located in the middle of the flexible strips, and the width of the flexible strips is greater than the circumference of the composite film filament tube, and a fluid flexible linear material is obtained.

[0104] As a further improvement of Example 3 of the present invention, the membrane-wrapped liquid-fluid flexible linear material is placed on the bobbin support frame of the friction spinning machine by short fiber coating spinning, and then fed into the dust cage of the friction spinning machine, and short fiber strips are fed at the same time, and after being combed and decomposed into single fibers, they are coated on the outer surface of the membrane-wrapped liquid-fluid flexible linear composite material. Kevlar filaments are wrapped around the outside of the yarn to achieve high strength and high wear resistance.

[0105] The fiber layer is polyimide fiber; the flexible strip is PU film.

[0106] Thus, Example 3 prepared a liquid-fluid flexible linear material of a core-sheath multilayer composite structure, which includes a liquid-fluid material as a core layer, a film layer encapsulating the liquid-fluid material, a flexible strip as a sheath layer that wraps around the film layer and wraps around the outside of the film layer, and a fiber layer wrapped around the outside of the flexible strip. The total fineness of the flexible strip and the fiber layer is 5010 tex.

[0107] Those skilled in the art know that the liquid fluid material can also be other types of nanoparticle / polymer suspension system (mainly including silica particles, polyvinyl chloride particles, calcium carbonate particles, polymethyl methacrylate particles, carbon nanofibers, titanium dioxide particles, etc. as dispersed phase, STF with polymer as dispersion medium), polymer solution system formed by polymerization of long-chain polymers (mainly including hydrophobic associating polymers, polymers in poor solvents), which can be selected accordingly according to actual application requirements, and its liquid fluid content can also be adaptively adjusted according to actual applications. The total fineness of the flexible strips and fiber layers and other parameter settings can also be adjusted according to actual conditions.

[0108] In summary, the present invention provides a liquid-fluid flexible linear material and a composite yarn forming method and application thereof. The liquid-fluid flexible linear material is a core-sheath composite structure, including a liquid-fluid material as a core layer, a film layer encapsulating the liquid-fluid material, and a flexible strip as a sheath layer that wraps around the film layer and wraps around the outer side of the film layer. The method provided by the present invention solves the technical problem that liquid-fluid cannot be combed and drawn into yarn, and provides a quick and effective method for making enhanced impact protection yarn and clothing fabrics from liquid-fluid materials.

[0109] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A liquid-fluid flexible linear material, characterized in that: The liquid-fluid flexible linear material is a core-sheath multilayer composite structure, including a liquid-fluid material as a core layer, a film layer encapsulating the liquid-fluid material, and a flexible strip as a sheath layer that wraps around the film layer and wraps around the outside of the film layer; The film layer is one of a polyethylene film, a polytetrafluoroethylene film, and a polyurethane film; The composite yarn forming method of the liquid-fluid flexible linear material is as follows: a two-step freezing technology is adopted to firstly freeze the shear thickening material, and after roller extrusion, the fluid is transformed into a solid sheet material, and a film is covered on the upper and lower surfaces of the sheet shear thickening material, and a secondary freezing treatment is performed, and the solidified shear thickening liquid sheet material is cut into shear thickening liquid flat ribbon-shaped filaments, and further composited with the flexible strips into yarn.

2. The liquid-fluid flexible linear material according to claim 1, characterized in that: The fluid flexible linear material further comprises a fiber layer coated on the outside of the flexible strip; The fiber layer is a mixture of one or more of aramid fiber, polyimide fiber, flame retardant viscose, flame retardant nylon, flame retardant polyester, flame retardant acrylic fiber, and seaweed fiber; The flexible strip is a mixture of one or more of a polyethylene film, a polytetrafluoroethylene film, a polyimide film, a PET film, and a PU film.

3. The liquid-fluid flexible linear material according to claim 1, characterized in that: The liquid fluid material is a mixture of one or more of a nanoparticle / polymer suspension system and a polymer solution system formed by polymerization of long-chain polymers.

4. The liquid-fluid flexible linear material according to claim 1, characterized in that: The liquid fluid material is one of a pure solution fluid material, a liquid / gas mixed liquid fluid material, and a liquid / solid mixed liquid fluid material.

5. A liquid-fluid composite yarn forming method, characterized in that: The method for preparing the liquid-fluid flexible linear material according to any one of claims 1 to 4 comprises the following steps: S1, using a freezing treatment to convert the liquid fluid material into a solid fluid material, and then performing a roller pressing treatment to obtain a sheet film material; S2, laminating the sheet film material to form a composite film material for thin film packaging; S3, performing secondary freezing treatment on the composite membrane material, and then shearing the composite membrane material to obtain composite membrane strips; S4, compounding the composite membrane filaments and the flexible strips into yarns, so that the flexible strips completely wrap around the composite membrane filaments to prepare a liquid-fluid flexible linear material; in the liquid-fluid flexible linear material, the weight content of the liquid-fluid material reaches 50% or more.

6. The liquid-fluid composite yarn forming method according to claim 5, characterized in that: Step S4 also includes: using a short fiber coating spinning method to comb the short fiber strips into single fibers and then coating them on the outer surface of the flexible strip sheath layer.

7. A device for preparing a liquid-fluid flexible linear material, characterized in that: Used to prepare the liquid-fluid flexible linear material as claimed in claim 1, comprising a roller (1) for rolling the solid fluid material after freezing, a coating roller for encapsulating a film on the surface of the solid fluid material, a refrigeration unit (5) connected to the coating roller, and a wing roll winding machine; The preparation device further comprises a shearing section connected to the refrigeration section (5) and a strip spinning section and a friction spinning machine connected in sequence to the wing spindle winding machine; The film coating roller portion comprises a pair of flexible film cylinders (3) symmetrically arranged on the upper and lower surfaces of the solid fluid material, and a guide roller (4) used for film coating and packaging processing; The refrigeration part (5) is a semiconductor refrigeration sheet symmetrically arranged up and down, and is used to perform secondary freezing treatment on the composite film material after film packaging.

8. Use of the liquid-fluid flexible linear material according to any one of claims 1 to 4 or the liquid-fluid flexible linear material prepared by the liquid-fluid composite yarn-forming method according to any one of claims 5 to 6 in the field of protective textiles.

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