Multifunctional woven mesh pipe and preparation method thereof

Abstract

The invention provides a multifunctional woven mesh pipe and a preparation method thereof, and belongs to the technical field of new materials. The multifunctional woven mesh pipe provided by the invention has a visual early warning effect and is formed by weaving two monofilament materials, namely the PET wear-resistant flame-retardant monofilament and the temperature-sensitive color-changing monofilament, so that the advantages of the PET wear-resistant flame-retardant monofilament and the temperature-sensitive color-changing monofilament are successfully combined, and the temperature-sensitive color-changing monofilament is introduced in the weaving process of the multifunctional mesh pipe and is woven together; the multifunctional PET woven mesh pipe with the visual early warning function is obtained. According to the preparation scheme provided by the invention, by optimizing process parameters, the orientation degree of the PET monofilament can be improved, the stretching ratio can be properly improved, and the mechanical property of the monofilament can be enhanced because under the action of external force, the arrangement regularity of macromolecules in the fiber along the axial direction of the fiber is improved, the orientation degree is improved, and meanwhile, the macromolecules in the fiber are induced to crystallize in an orientation manner. The tight crystallization orientation of the PET monofilaments can effectively improve the wear resistance of the woven mesh tube.

Description

Technical Field

[0001] The invention relates to the technical field of new materials, and in particular to a multifunctional braided mesh tube and a preparation method thereof. Background Art

[0002] Braided mesh tubes are usually made of materials such as metal, PET, nylon monofilament or polyester fiber with good insulation and corrosion resistance. These materials give the braided mesh tubes high mechanical strength and tensile strength, enabling them to withstand large current loads and voltage loads. According to different manufacturing methods and uses, they can be divided into many types, such as flame retardant and non-flame retardant, telescopic braided mesh tubes and self-rolling braided mesh tubes.

[0003] Flame retardant braided network tubes are mainly used for automotive wiring harnesses, optical fiber cables, signal lines, etc., while non-flame retardant types are mainly used for wiring harness products such as electronic wires, data cables, computer cables, speaker cables, etc. Braided network tubes are widely used in the maintenance and beautification of computer power cables, audio and video cables, lighting, air conditioners, refrigerators, washing machines and other household appliances, as well as optical cables, motorcycles, cars, airplanes and other lines. With its unique structure and excellent performance, it plays an important role in the electronic, electrical and industrial fields.

[0004] However, the performance of the braided network tube in the prior art needs to be further improved. Summary of the invention

[0005] The object of the present invention is to provide a multifunctional braided mesh tube and a preparation method thereof, which has excellent wear resistance.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The invention provides a multifunctional braided mesh tube, which is composed of mutually interwoven wear-resistant flame-retardant monofilament strands and temperature-sensitive color-changing monofilament strands.

[0008] Preferably, the number of strands of the wear-resistant and flame-retardant monofilaments or the number of strands of the temperature-sensitive color-changing monofilaments is 3 to 8.

[0009] Preferably, the wear-resistant and flame-retardant monofilament is a PET wear-resistant and flame-retardant monofilament.

[0010] Preferably, the mesh width of the multifunctional braided mesh tube is 0.3 to 2.0 times the diameter of the monofilament.

[0011] Preferably, the mesh shape of the multifunctional braided mesh tube is square or diamond.

[0012] Preferably, the wire diameter of the wear-resistant flame-retardant monofilament or the temperature-sensitive color-changing monofilament is 0.20 to 0.45 mm.

[0013] The present invention also provides a method for preparing the multifunctional braided mesh tube, comprising the following steps:

[0014] Plying the wear-resistant and flame-retardant monofilaments;

[0015] Plying the thermosensitive color-changing monofilaments;

[0016] The wear-resistant flame-retardant monofilament strands and the temperature-sensitive color-changing monofilament strands are interlaced and woven to obtain a multifunctional braided mesh tube;

[0017] The wear-resistant flame-retardant monofilament is prepared by a preparation method comprising the following steps:

[0018] PET resin, halogen-free phosphorus flame retardant, nitrogen-containing flame retardant and masterbatch are mixed, melt-extruded, cooled and stretched to obtain wear-resistant flame-retardant monofilament.

[0019] Preferably, the halogen-free phosphorus flame retardant is one or more of resorcinol bis(diphenyl) phosphate, bisphenol A bis(diphenyl) phosphate, triphenylmethyl phosphate, isopropylphenyl phosphate or triphenyl phosphate;

[0020] The nitrogen-containing flame retardant is one or both of melamine pyrophosphate and melamine cyanurate. In the present invention, the flame retardant effects of phosphorus-based flame retardants and nitrogen-based flame retardants in practical applications are complementary. Phosphorus-based flame retardants form phosphoric acid, metaphosphoric acid and polyphosphoric acid when thermally decomposed. The formed phosphoric acid substances will form a non-volatile protective film on the surface of the polymer material, isolating oxygen in the air and achieving a flame retardant effect. At the same time, the carbon dioxide, ammonia, nitrogen, water vapor and other gases generated by the thermal decomposition of nitrogen-based flame retardants can play a role in diluting combustible gases, reducing the concentration of combustible gases around the combustion environment, and achieving a flame retardant effect. The combined use of these two flame retardants can significantly improve the flame retardant effect of the material.

[0021] Preferably, the resin intrinsic viscosity of the PET resin is greater than 0.6 dl / g;

[0022] The weight ratio of the PET resin, the halogen-free phosphorus flame retardant, the nitrogen-containing flame retardant and the masterbatch is 95-100:0.5-1.5:0.3-0.8:1-2.

[0023] Preferably, the parameters in the cooling and stretching process include:

[0024] The monofilament diameter is 0.2-0.3 mm, the cooling liquid temperature is 60-70° C., the drawing speed is 45-55 m / min, the monofilament stretching ratio is 4.5-5.7, and the heat setting temperature is 160-230° C. In the present invention, if the monofilament stretching ratio is too low (<4.5), the orientation degree of the macromolecule is not high, the crystallinity is low, and the breaking strength of the monofilament is relatively low. If the breaking strength of the monofilament is too low, abnormalities such as broken wires are prone to occur in the subsequent weaving process, thereby reducing production efficiency. If the monofilament stretching ratio is too high (>6.5), during the stretching process, the macromolecular movement obviously cannot keep up with the stretching deformation process. Due to the existence of weak links, the monofilament is easy to break during the stretching process.

[0025] Beneficial effects of the present invention:

[0026] The multifunctional braided mesh tube provided by the present invention has a visual warning function and is woven from two monofilament materials, namely, PET wear-resistant and flame-retardant monofilament and temperature-sensitive color-changing monofilament. The visual warning function is mainly achieved by the monofilament with the temperature-sensitive color-changing function. The structure provided by the present invention successfully combines the advantages of the two. The temperature-sensitive color-changing monofilament is introduced into the weaving process of the multifunctional mesh tube to weave together, so as to obtain a multifunctional PET braided mesh tube with a visual warning function.

[0027] The preparation scheme provided by the present invention can improve the orientation degree of PET monofilaments by optimizing process parameters, appropriately increase the stretching ratio, and enhance the mechanical properties of the monofilaments. This is because under the action of external force, the regularity of the arrangement of macromolecules in the fiber along the fiber axis is improved, the orientation degree is improved, and the orientation induces the crystallization of macromolecules in the fiber. The tight crystal orientation of PET monofilaments can effectively improve the wear resistance of the braided mesh tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the multifunctional braided mesh tube in the present invention. DETAILED DESCRIPTION

[0029] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0030] Example 1

[0031] 1. Preparation scheme of PET wear-resistant flame-retardant monofilament: 97 parts of PET resin, the resin intrinsic viscosity is 0.72dl / g. 0.8 parts of triphenyl phosphate flame-retardant masterbatch, 0.5 parts of melamine cyanurate flame-retardant masterbatch, 1.5 parts of black masterbatch. PET wear-resistant flame-retardant monofilament is obtained by melt extrusion, cooling and stretching.

[0032] The screw extruder has a diameter of 65 mm, and the host temperature is set to 195℃, 205℃, 225℃, 245℃, 255℃, 265℃, 270℃, 270℃, the single filament diameter is 0.25±0.02mm, the cooling liquid temperature is 65℃, the drawing speed is 52m / min, the single filament stretching ratio is 5.2, and the heat setting temperature is 200℃.

[0033] 2. Preparation plan of thermochromic masterbatch: 4 parts of 3PC thermochromic powder, 94 parts of PETG resin, K2012 from SK of South Korea, 0.5 parts of erucamide and 0.5 parts of octadecanoic acid monoglyceride.

[0034] The single screw extruder was used for extrusion granulation, and the main machine heating temperature was set to 155℃, 165℃, 175℃, 190℃, and 195℃. The extruded strands, pelletized, dried for 4 hours, and then bagged. The PETG resin was dried at 50℃ for 4 hours.

[0035] 3. Preparation plan of temperature-sensitive color-changing monofilament: 20 parts of temperature-sensitive color-changing masterbatch, 0.8 parts of toluene dimethyl phosphate, 79 parts of PETG resin, the masterbatch and resin particles are dried at 50°C for 4 hours.

[0036] A single screw extruder was used for extrusion and drawing, and the main machine heating temperature was set to 165°C, 175°C, 185°C, 195°C, 200°C, 200°C, 215°C, and 215°C. The single filament diameter was 0.25±0.02mm, the cooling liquid temperature was 32°C, the hot water drawing temperature was 98°C, the drawing speed was 50m / min, and the single filament drawing ratio was 5.7.

[0037] 4. Multifunctional braided mesh tube preparation plan: 4 PET wear-resistant flame-retardant monofilaments are split and plied together, and 4 temperature-sensitive color-changing monofilaments are split and plied together. 18 strands of PET wear-resistant flame-retardant monofilaments and 6 strands of temperature-sensitive color-changing monofilaments are interlaced and woven into a mesh tube. The structural diagram is shown in the figure. Figure 1 shown.

[0038] Example 2

[0039] The only difference from Example 1 is that the preparation scheme of the multifunctional braided mesh tube is replaced by: 3 PET wear-resistant and flame-retardant monofilament yarns are twisted together, and 3 temperature-sensitive color-changing monofilament yarns are twisted together, and the mesh tube is woven by 18 strands of PET wear-resistant and flame-retardant monofilaments and 6 strands of temperature-sensitive color-changing monofilaments.

[0040] Example 3

[0041] The only difference from Example 1 is that the preparation scheme of the multifunctional braided mesh tube is replaced by: 8 PET wear-resistant and flame-retardant monofilaments are yarn-plying together, and 8 temperature-sensitive color-changing monofilaments are yarn-plying together, and the mesh tube is woven by interlacing 18 PET wear-resistant and flame-retardant monofilaments and 6 temperature-sensitive color-changing monofilaments.

[0042] Example 4

[0043] The only difference from Example 1 is that the preparation scheme of the multifunctional braided mesh tube is replaced by: 5 PET wear-resistant and flame-retardant monofilament yarns are twisted together, and 5 temperature-sensitive color-changing monofilament yarns are twisted together, and the mesh tube is woven by 18 strands of PET wear-resistant and flame-retardant monofilaments and 6 strands of temperature-sensitive color-changing monofilaments.

[0044] Example 5

[0045] The only difference from Example 1 is that the amount of triphenyl phosphate flame retardant masterbatch in the preparation scheme of PET wear-resistant flame retardant monofilament is changed from 0.8 parts to 1.2 parts, and the amount of melamine cyanurate flame retardant masterbatch is changed from 0.5 parts to 0.8 parts.

[0046] Example 6

[0047] The only difference from Example 1 is that the main engine temperature in the preparation scheme of PET wear-resistant flame-retardant monofilament is changed to 225°C, 235°C, 245°C, 255°C, 265°C, 280°C, 280°C, 280°C, the cooling liquid temperature is 60°C, the monofilament stretching ratio is 5.7, and the heat setting temperature is 210°C.

[0048] Example 7

[0049] The only difference from Example 1 is that the main engine temperature in the preparation scheme of PET wear-resistant flame-retardant monofilament is changed to 225°C, 235°C, 245°C, 255°C, 265°C, 280°C, 280°C, 280°C, the cooling liquid temperature is 60°C, the monofilament stretching ratio is 6.2, and the heat setting temperature is 210°C.

[0050] Comparative Example 1

[0051] 1. Preparation scheme of PET wear-resistant flame-retardant monofilament: without adding flame-retardant masterbatch, and the rest is the same as Example 1.

[0052] 2. Preparation scheme of thermochromic masterbatch: same as Example 1.

[0053] 3. Preparation scheme of temperature-sensitive color-changing monofilament: same as Example 1.

[0054] 4. Preparation scheme of multifunctional braided mesh tube: same as Example 1.

[0055] Comparative Example 2

[0056] Preparation scheme of PET wear-resistant flame-retardant monofilament: the same as Example 1. Four PET wear-resistant flame-retardant monofilaments are separated and twisted, and the wear-resistant flame-retardant PET monofilaments are interlaced and woven into a mesh tube.

[0057] Experimental example

[0058] The braided mesh tubes prepared in the above embodiments and comparative examples were subjected to abrasion resistance tests according to standard ISO 6722-1 and flame retardancy tests according to standard GB / T 2406.2-2009. Real-scene simulation was performed on the braided mesh tubes to observe whether they have a visual warning function. Detailed parameters are shown in Table 1.

[0059] Table 1 Abrasion resistance test and flame retardant test results

[0060]

[0061] As can be seen from Table 1, the application of the flame-retardant and wear-resistant monofilament in the present invention enables the braided mesh tube to have a certain flame-retardant effect, and does not affect the color-changing effect of the temperature-sensitive color-changing monofilament. The temperature-sensitive color-changing monofilament changes from colored to white and nearly colorless, indicating that the visual warning function takes effect. The stretching ratio provided by the present invention can achieve the best effect of improving wear resistance. Using too high a stretching ratio will reduce the wear resistance. This is because too high a stretching ratio will cause the macromolecules to slip and break while destroying the original crystal structure, thereby reducing the wear resistance of the braided mesh tube.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multifunctional braided mesh tube, characterized in that: It is composed of interwoven wear-resistant and flame-retardant monofilaments and temperature-sensitive color-changing monofilaments.

2. The multifunctional braided mesh tube according to claim 1, characterized in that: The number of strands of the wear-resistant and flame-retardant monofilaments or the number of strands of the temperature-sensitive color-changing monofilaments is 3 to 8.

3. The multifunctional braided mesh tube according to claim 1, characterized in that: The wear-resistant and flame-retardant monofilament is a PET wear-resistant and flame-retardant monofilament.

4. The multifunctional braided mesh tube according to claim 1, characterized in that: The mesh width of the multifunctional braided mesh tube is 0.3 to 2.0 times the diameter of the monofilament.

5. The multifunctional braided mesh tube according to claim 4, characterized in that: The mesh shape of the multifunctional braided mesh tube is square or rhombus.

6. The multifunctional braided mesh tube according to claim 1, characterized in that: The wire diameter of the wear-resistant flame-retardant monofilament or the temperature-sensitive color-changing monofilament is 0.20-0.45 mm.

7. The method for preparing the multifunctional braided mesh tube according to any one of claims 1 to 6, characterized in that: The following steps are involved: Plying the wear-resistant and flame-retardant monofilaments; Plying the thermosensitive color-changing monofilaments; The wear-resistant flame-retardant monofilament strands and the temperature-sensitive color-changing monofilament strands are interlaced and woven to obtain a multifunctional braided mesh tube; The wear-resistant flame-retardant monofilament is prepared by a preparation method comprising the following steps: PET resin, halogen-free phosphorus flame retardant, nitrogen-containing flame retardant and masterbatch are mixed, melt-extruded, cooled and stretched to obtain wear-resistant flame-retardant monofilament.

8. The method for preparing the multifunctional braided mesh tube according to claim 7, characterized in that: The halogen-free phosphorus flame retardant is one or more of resorcinol bis(diphenyl) phosphate, bisphenol A bis(diphenyl) phosphate, triphenylmethyl phosphate, cumyl phosphate or triphenyl phosphate; The nitrogen-containing flame retardant is one or both of melamine pyrophosphate and melamine cyanurate.

9. The method for preparing the multifunctional braided mesh tube according to claim 7, characterized in that: The resin intrinsic viscosity of the PET resin is greater than 0.6 dl / g; The weight ratio of the PET resin, the halogen-free phosphorus flame retardant, the nitrogen-containing flame retardant and the masterbatch is 95-100:0.5-1.5:0.3-0.8:1-2.

10. The method for preparing the multifunctional braided mesh tube according to claim 7, characterized in that: The parameters in the cooling and stretching process include: The diameter of the single filament is 0.2-0.3 mm, the temperature of the cooling liquid is 60-70° C., the drawing speed is 45-55 m / min, the single filament stretching ratio is 4.5-5.7, and the heat setting temperature is 160-230° C.

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