Cobweb-like warp-knitted structure protective net and preparation method thereof

Abstract

The invention discloses a cobweb-imitated warp-knitted structure protective net which comprises a cobweb-imitated structure protective net body, the cobweb-imitated structure protective net body is formed by weaving high-performance yarn, the high-performance yarn is formed by weaving high-performance fiber as a raw material, and after the cobweb-imitated structure protective net body is soaked in a coating solution, the cobweb-imitated warp-knitted structure protective net body is obtained. A sensing functional layer is formed on the surface of the coating solution, and the coating solution is a mixed solution containing an intelligent fluid material. The anti-impact high-energy-dissipation-efficiency composite material has the advantages of being excellent in anti-impact performance, high in energy dissipation efficiency, high in reliability and the like so as to meet the urgent needs of urban safety protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of protective textile-based intelligent manufacturing, in particular to a simulated spider web warp-knitted structure protective net and a preparation method thereof. BACKGROUND

[0002] In the process of urban modernization in China, as the key node of underground drainage, power, communication and other systems, the safety of inspection wells is directly related to the safety of people's life and property. However, the frequent occurrence of problems such as loss and damage of well covers has led to falling accidents, which has become one of the hidden dangers of urban public safety. The installation of protective nets under the well covers has become an important means to protect the safety of citizens through the buffering and supporting effect of flexible mesh materials.

[0003] As an engineering material that integrates lightweight and structural functions, protective flexible mesh materials have broad application prospects in the fields of military defense, industrial safety, and protection of urban infrastructure safety. For example, the protective net disclosed in patent application No. CN200820086642.8 has a center ring at the center of the protective net, and the protective net is woven by a plurality of ropes between the center ring and the fixed ring. For another example, the safety protective net for stainless steel well covers disclosed in patent application No. CN202222232284.X has longitudinal and transverse reinforcing ribs arranged in a crisscross manner on the outer frame of the protective net, forming a protective net structure with a diamond-shaped grid shape. The above-mentioned protective nets all adopt a grid-shaped structure, and the grid shape can be square, diamond, hexagonal, circular, etc. However, the protective nets that constitute the grid-shaped structure are mostly made of conventional materials, such as conventional polypropylene multifilament materials, or other soft materials with high tensile strength. The protective nets made of conventional mesh materials often have the significant defects of single structure design, poor impact resistance, easy aging, and low reliability, which are difficult to meet the needs of urban safety protection. SUMMARY

[0004] The present application solves the problem of providing a simulated spider web warp-knitted structure protective net and a preparation method thereof, which has excellent impact resistance, high energy dissipation efficiency, and high reliability, to meet the urgent needs of urban safety protection.

[0005] In the first aspect, the present application provides a simulated spider web warp-knitted structure protective net, characterized in that it comprises a simulated spider web structure protective net, which is woven by high-performance yarns made of high-performance fibers, and a sensing functional layer formed on the surface of the simulated spider web structure protective net after impregnation and coating of a solution, wherein the coating solution is a mixed solution containing intelligent fluid materials.

[0006] The high-performance fiber adopts aramid fiber, carbon fiber or ultra-high molecular weight polyethylene fiber, and the fineness of the high-performance fiber is 400D-1200D.

[0007] The high-performance yarn is knitted by using the high-performance fiber as raw material through a 6-strand, 8-strand or 10-strand knitting method, and the knitting pitch is 4mm-10mm.

[0008] The protective net in the spider web structure comprises a plurality of radial lines and a plurality of spiral line structures, the plurality of radial lines are distributed radially, the plurality of spiral line structures are distributed radially along the radial lines and connected with the radial lines to form the spider web structure.

[0009] The coating solution is a mixed solution comprising a smart fluid material and an additive, the smart fluid material adopts a shear thickening fluid or a magnetic fluid material, and the additive adopts MXene, multi-walled carbon nanotube or graphene oxide.

[0010] In a second aspect, the present application provides a preparation method of a protective net in a spider web warp-knitted structure, which is used for preparing the protective net in the spider web warp-knitted structure, and the preparation method comprises the following steps: S1, using high-performance fiber as raw material, knitting high-performance yarn, and knitting the high-performance yarn into a protective net in a spider web structure; S2, immersing the protective net in the spider web structure in a coating solution for 1 hour and then taking it out, so that a sensing functional layer is formed on the surface of the protective net in the spider web structure, wherein the coating solution is a mixed solution comprising a smart fluid material; S3, drying the protective net in the spider web structure.

[0011] In S2, the smart fluid material comprises SiO2 and PEG600, gas-phase SiO2 is gradually dispersed into PEG600 through a gradual addition process, a high-speed mechanical mixer is used to realize uniform dispersion at a speed of 1500r / min-3500r / min in combination with an ultrasonic homogenizer, until the mass fraction of SiO2 reaches 60%-65%, and a shear thickening liquid is obtained.

[0012] In S2, ethanol is further used to dilute the shear thickening liquid to obtain a uniform coating solution, and the mass ratio of the ethanol to the shear thickening liquid is 1:1 to 3:1.

[0013] In S2, multi-walled carbon nanotubes are added to the shear thickening liquid, and mechanical stirring and ultrasonic stirring are used to realize uniform dispersion, so as to obtain a composite solution, the concentration of the multi-walled carbon nanotubes in the composite solution is 0.4%-0.8%, and then ethanol is further used to dilute the composite solution to obtain a uniform coating solution, and the mass ratio of the ethanol to the composite solution is 1:1 to 3:1.

[0014] The beneficial effects of the spider-web-imitating warp-knitted structure protective net and the preparation method of the present application are as follows: the protective net is knitted by high-performance yarns, so that the protective net is not easy to age, has higher reliability, and has a longer service life; the protective net is knitted into a spider-web-imitating structure, which can disperse energy through the deformation of the net body and the sliding of the nodes, has high energy dissipation efficiency, and has better impact resistance; the spider-web-imitating structure is coated with a solution, and the solution contains intelligent fluid materials, so that the protective net can gather together instantly after being impacted, increase the viscosity of the net body, further improve the impact resistance, and form a sensing functional layer on the surface of the protective net, so that the protective net can detect stress and instantaneous impact, can meet the design requirements of an intelligent early warning system, and can meet the needs of urban safety protection. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of a spider-web-imitating protective net of the present application. Figure 2 FIG. 3 is a comparison diagram of blast force-displacement curves of three spider-web-imitating protective nets under different blast forces. Figure 3 FIG. 5 is a diagram of the change of the resistance of the protective net prepared in Example 3 of the present application with different blast forces. Figure 4 FIG. 7 is a diagram of the change of the resistance of the protective net prepared in Example 3 of the present application under different impact heights. Figure 5 FIG. 9 is a comparison diagram of thermogravimetric analysis curves of three spider-web-imitating protective nets. Figure 6 FIG. 11 is a schematic diagram of a sensing response module of the spider-web-imitating protective net of the present application. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] Wherein, the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the present application, and the words "bottom" and "top", "inner" and "outer" refer to the directions towards or away from a particular part. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more.

[0018] The present application will be further described below in conjunction with the drawings and examples.

[0019] Example 1, a warp protective net based on a spider web structure, as shown in Figure 1 The protective net based on a spider web structure is composed of high-performance yarns, and the high-performance yarns are made of high-performance fibers. Specifically, the high-performance fibers can be selected from aramid fibers, carbon fibers or ultra-high molecular weight polyethylene fibers, and the high-performance fibers are 400D-1200D. The high-performance yarns are made of the high-performance fibers by 6-strand, 8-strand or 10-strand weaving method, and the weaving pitch is 4mm-10mm. The high-performance yarns are woven into a spider web structure. After the protective net based on a spider web structure is immersed in a coating solution, a sensing functional layer is formed on the surface of the protective net based on a spider web structure. The coating solution is a mixed solution containing smart fluid materials and additives. The smart fluid materials are shear thickening fluid or magnetic fluid materials, and the additives are MXene, multi-walled carbon nanotubes (MWCNTs) or graphene oxide. MXene is a new type of nanomaterial with a two-dimensional layered structure.

[0020] The protective net based on a spider web structure prepared by the present application is a warp knotless net, which has the following advantages: 1. The protective net based on a spider web structure prepared by high-performance yarns can disperse energy through net body deformation and node sliding, so that the protective net has excellent impact resistance. After being immersed in a mixed solution containing smart fluid materials, the smart fluid materials contained in the mixed solution make the protective net gather together instantly after being impacted, thereby increasing the viscosity of the system. 2. The sensing functional layer is coated on the protective net based on a spider web structure by the immersion method, which gives the protective net excellent sensing performance, so that it can detect stress and instantaneous impact, and is suitable for subsequent integrated design requirements with an intelligent early warning system, thereby realizing the integration of structural design and functional application. 3. The protective net prepared by this invention has a sensing functional layer, which can form a dense and uniform barrier layer on the fiber surface during combustion, effectively isolating air, preventing heat transfer, and significantly reducing the release of combustible gases, thereby inhibiting the further spread of combustion and enhancing the flame retardancy of the protective net.

[0021] Example 2: A method for preparing a warp-knitted protective net based on a spider web-like structure, comprising the following steps: S1. High-performance fibers are used, such as aramid multifilament with a fineness of 600D. The high-performance yarn is made into a high-performance yarn with a weaving pitch of 4 through an 8-ply weaving process. Using knitting technology, the high-performance yarn is woven into a divergent topology structure with spider web mechanical characteristics, which contains multiple radial lines and multiple spiral lines. This divergent topology structure is a spider web-like structure.

[0022] Specifically, the radial lines are made using a chain-link weft weave and the spiral lines are made using a chain-link weave, resulting in a warp-knitted protective net with a spider web-like structure. This weaving method is existing technology and can be found in the invention patent publications CN117568999A-Preparation method of high-performance warp-knitted net with biomimetic spider web structure or CN120119390A-Integrated irregular warp-knitted net with spider web-like structure and its preparation method. It will not be elaborated here.

[0023] S2. Vaporized SiO2 is gradually dispersed into PEG600 (polyethylene glycol) through a stepwise addition process. A high-speed mechanical mixer at 2000 r / min combined with an ultrasonic homogenizer is used to achieve uniform dispersion until the mass fraction of SiO2 reaches 64%, thus obtaining the smart fluid material (abbreviated as STF). A uniform coating solution was obtained by diluting STF with ethanol at a mass ratio of 2:1. The warp-knitted protective net with a spider web-like structure is immersed in a coating solution for 1 hour, then removed and excess liquid is squeezed out with a rubber roller.

[0024] S3. After the residual liquid is squeezed out, the warp-knitted protective net with the imitation spider web structure is placed in an oven and dried at 80°C for 3 hours to evaporate the ethanol in the warp-knitted protective net with the imitation spider web structure, forming a sensing functional layer, thus obtaining a warp-knitted protective net with the imitation spider web structure function.

[0025] Example 3: A method for preparing a spider web-like warp-knitted intelligent protective net, comprising the following steps: S1. Select high-performance fibers, such as aramid multifilament with a fineness of 600 D, and make high-performance yarn with a weaving pitch of 4 through an 8-ply weaving process. Using knitting technology, the high-performance yarn is woven into a divergent topology structure with spider web mechanical characteristics, which contains multiple radial lines and multiple spiral lines. This divergent topology structure is a spider web-like structure.

[0026] Specifically, the radial lines adopt chain filling weft stitches, and the spiral lines adopt chain stitches to prepare the warp protection net with a simulated spider web structure. The weaving method is prior art, and can refer to the invention patent CN117568999A-Preparation method of high-performance warp net with bionic spider web structure or CN120119390A-Integrated bionic spider web-shaped special-shaped warp net and preparation method thereof. Details are not repeated here.

[0027] S2, gradually disperse fumed SiO2 into PEG600 by a step-by-step addition process, use a high-speed mechanical mixer at a speed of 2000 r / min combined with an ultrasonic homogenizer to achieve uniform dispersion until the mass fraction of SiO2 reaches 64%, to obtain a shear thickening liquid. Add multi-walled carbon nanotubes (MWCNTs) to the well-dispersed shear thickening liquid (STF) and use a combination of mechanical stirring and ultrasonic stirring for further mixing until the multi-walled carbon nanotube concentration reaches 0.6%, to prepare a composite solution.

[0028] Dilute the above composite solution with ethanol to obtain a uniform coating solution, and the mass ratio of ethanol to composite solution is 2:1; use the immersion method to immerse the warp protection net with a simulated spider web structure in the coating solution for 1 hour, then take it out and squeeze out the excess liquid with a rubber squeeze roller.

[0029] S3, place the warp protection net with a simulated spider web structure after squeezing out the excess liquid into an oven, the drying temperature is 80°C, heat for 3 hours, evaporate the ethanol in the warp protection net with a simulated spider web structure to form a sensing functional layer, to prepare a warp protection net with a simulated spider web structure.

[0030] The silicon dioxide (SiO2) in the above examples is purchased from Zhejiang Manz Nano Technology Co., Ltd.; the multi-walled carbon nanotubes (MWCNTs) are purchased from Suzhou Carbon Fortune Graphene Technology Co., Ltd., formerly Suzhou Hengqiu Graphene Technology Co., Ltd.; the aramid composite yarn is purchased from Taishan New Material Group Co., Ltd.; the polyethylene glycol 600 (PEG600) and ethanol are purchased from National Pharmaceutical Group Chemical Reagent Co., Ltd.

[0031] As Figure 2As shown, the embodiments provide three kinds of warp protection nets under the action of different blasting forces from left to right, and the blasting force-displacement curve diagram, wherein the three kinds of warp protection nets from left to right are: the first kind of protection net is the ordinary warp protection net prepared by adopting S1 step in example 2, the second kind of protection net is the warp protection net prepared by adopting the complete preparation method of example 2, and the third kind of protection net is the warp protection net prepared by adopting the complete preparation method of example 3. As can be seen from the blasting force-displacement curve diagram, the blasting force-displacement curve of the first kind of warp protection net is relatively stable as a whole, indicating that its impact resistance performance is at a basic level, and it can only withstand a lower impact energy, but still has basic protection efficiency. By comparing the blasting force-displacement curves of the first kind of protection net and the second kind of protection net, it can be seen that the fluctuation amplitude of the curve of the functional protection net after adding STF is obviously increased, which reflects that the impact energy that the functional protection net can withstand has been significantly improved, and the impact resistance performance is enhanced. As for the third kind of warp protection net, when impacted, the viscosity of the system increases sharply due to the instantaneous aggregation of SiO2 particles, and MWCNTs and particle clusters form a complex network structure, further increasing the friction between fibers and effectively reducing the relative slip between fibers. Based on these characteristics, the third kind of warp protection net has stronger impact resistance, and its impact resistance performance is more excellent than the first two kinds of warp protection nets.

[0032] As shown in Figure 3 , in terms of sensing performance, the resistance change of the third kind of protection net prepared according to example 3 under the condition of different blasting forces presents obvious regularity, and the resistance change caused by different height impacts is also sensitive; as shown in Figure 4 , which indicates that it can effectively detect instantaneous impact and has excellent sensing performance, providing strong data support for its application in intelligent early warning systems.

[0033] As shown in Figure 5 , compared with the first two kinds of protection nets, the weight loss of the third kind of protection net prepared according to example 3 after burning is smaller. This is because during the burning process, SiO2 can form a dense and uniform barrier layer on the surface of aramid fiber, which not only can effectively isolate air and prevent heat transfer, but also can significantly reduce the release of flammable gas, thereby curbing the further spread of burning. At the same time, MWCNTs can catalyze the formation of stable carbon layer in the polymer matrix under high temperature conditions, and this carbon layer covers the surface of aramid fiber, further enhancing the heat and oxygen isolation ability of the warp protection net, thereby improving the overall flame retardant performance.

[0034] Figure 6The present application provides a schematic diagram of a sensing response module of an intelligent downhole protective net. It generally comprises a sensing module formed by the protective net, a processing module, and an alarm module, which are sequentially connected. When a well falling accident occurs, the resistance of the knitted protective net will decrease in the moment of being impacted by external force. Once the resistance decreases below the set safety threshold, the signal will trigger the alarm mechanism of the alarm module after being processed by the processing module, and timely alarm signals will be sent to save the time for rescue of the falling personnel.

[0035] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application in any way. Many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. The specific exemplary embodiments described above are chosen for purposes of illustration and example only. The scope of the application is intended to be limited only by the claims and their equivalents.

Claims

1. A protective net with a warp-knitted structure resembling a spider web, characterized in that, It includes a protective net with a spider web-like structure, which is woven from the high-performance yarn, which is made from high-performance fibers. After the protective net with a spider web-like structure is impregnated with a coating solution, a sensing functional layer is formed on its surface, wherein the coating solution is a mixed solution containing smart fluid materials.

2. The protective net with a warp-knitted structure resembling a spider web as described in claim 1, characterized in that, The high-performance fiber is made of aramid fiber, carbon fiber or ultra-high molecular weight polyethylene fiber, and the fineness of the high-performance fiber is 400D-1200D.

3. The protective net with a warp-knitted structure resembling a spider web according to claim 2, characterized in that, The high-performance yarn is made from the high-performance fiber and is woven using a 6-ply, 8-ply, or 10-ply weaving method, with a weaving pitch of 4mm-10mm.

4. The protective net with a warp-knitted structure resembling a spider web as described in claim 1, characterized in that, The protective netting with a spiderweb-like structure includes multiple radial lines and multiple spiral structures. The radial lines are distributed radially, and the spiral structures are distributed radially along the radial lines and connected to them to form a spiderweb-like structure.

5. The protective net with a warp-knitted structure resembling a spider web according to claim 1, characterized in that, The coating solution is a mixed solution containing smart fluid materials and additives. The smart fluid material is a shear-thickening fluid or a magnetic fluid material, and the additives are MXene, multi-walled carbon nanotubes, or graphene oxide.

6. A method for preparing a protective net with a warp-knitted structure resembling a spider web, the method being used to prepare the protective net with a warp-knitted structure resembling a spider web as described in claim 1, characterized in that, It includes: S1. High-performance fibers are used as raw materials to weave high-performance yarns, and the high-performance yarns are woven into a protective net with a spider web-like structure. S2. After immersing the protective net with the spider web structure in the coating solution for 1 hour, remove it to form a sensing functional layer on its surface. The coating solution is a mixed solution containing smart fluid materials. S3. Dry the protective netting with the spider web-like structure.

7. The method for preparing a protective net with a warp-knitted structure resembling a spider web according to claim 6, characterized in that, In S2, the smart fluid material includes SiO2 and PEG600. The gaseous SiO2 is gradually dispersed into PEG600 through a stepwise addition process. A high-speed mechanical mixer is used at a speed of 1500 r / min-3500 r / min in combination with an ultrasonic homogenizer to achieve uniform dispersion until the mass fraction of SiO2 reaches 60%-65%, thus obtaining a shear-thickened liquid.

8. The method for preparing a protective net with a warp-knitted structure resembling a spider web according to claim 7, characterized in that, In step S2, the shear-thickening liquid is further diluted with ethanol to obtain a uniform coating solution, wherein the mass ratio of ethanol to the shear-thickening liquid is 1:1 to 3:

1.

9. A protective net with a warp-knitted structure resembling a spider web, as described in claim 7, is characterized in that... In step S2, multi-walled carbon nanotubes are added to the shear-thickening liquid, and uniform dispersion is achieved by mechanical stirring and ultrasonic stirring to obtain a composite solution. The concentration of multi-walled carbon nanotubes in the composite solution is 0.4%-0.8%. The composite solution is then diluted with ethanol to obtain a uniform coating solution. The mass ratio of ethanol to the composite solution is 1:1 to 3:1.

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