Inorganic fiber protective material and preparation method thereof

Abstract

The invention discloses an inorganic fiber protective material and a preparation method thereof. The inorganic fiber protective material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 4-15 parts of inorganic powder, 5-15 parts of water-based resin and 5-15 parts of water; and the component B comprises the following components in parts by weight: 3-10 parts of organic silicon resin, 15-30 parts of ethanol, 0.5-3 parts of xylene and 0.1-0.5 part of ammonia water. The inorganic fiber protective material can effectively repair the defects of the inorganic fibers, can form a moisture-proof protective layer on the surfaces of the inorganic fibers, and effectively solves the problem that the inorganic fibers are easy to break in the moisture-proof and cable insulation processing process.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, specifically relating to an inorganic fiber protective material and its preparation method. Background Technology

[0002] With the rapid development of strategic emerging industries such as new energy and high-end equipment, the whole society attaches great importance to fire safety, and relevant industry standards are constantly being improved. This has driven high-temperature resistant and fire-resistant wires and cables to become core basic components for ensuring stable operation in key areas and safeguarding the bottom line of safety. Their widespread application is driven by both the upgrading of extreme environments and the increasingly stringent safety protection standards. Inorganic fiber filaments, represented by glass fiber, quartz fiber, and alumina fiber, have become the core reinforcement and insulation substrate in the preparation of these wires and cables due to their unique material properties. They are widely applicable to key scenarios with stringent requirements for safety protection levels and environmental resistance performance, such as aerospace, rail transportation, high-rise buildings, new energy power generation, metallurgy, and chemical industry.

[0003] However, these inorganic fibers also have significant limitations in application, and some defects have a cumulative amplification effect: First, they are brittle and easily break under external impact during cable processing, laying, and use. The resulting fiber breakage not only affects product safety but may also reduce insulation reliability. Second, they lack flexibility, which limits the bending performance of cables and is not conducive to wiring operations in confined spaces. Third, processing and material characteristics bring additional hidden dangers—the polarity of inorganic oxides themselves, combined with unavoidable fiber breaks and micro-cracks during production, makes wires and cables with them as insulation components generally have poor moisture resistance. In the insulation processing stages such as winding and braiding, tiny and fine insulation burrs are easily generated, further aggravating the adsorption and penetration of moisture on the insulation surface and accelerating the decay of insulation performance. In addition, some inorganic fibers (such as glass fiber) are highly hygroscopic, requiring additional moisture protection measures. Their processing requirements are also higher; fiber dispersion and compatibility with matrix materials directly affect the quality of the finished product, and the production cost is relatively higher than that of traditional organic fibers, which to some extent limits their large-scale application in ordinary scenarios.

[0004] Furthermore, during the winding and weaving processes of inorganic fibers (such as glass fiber and quartz fiber), due to their high brittleness and coefficient of friction, silane coupling agents are often used to modify lubricants. The core function of these lubricants is to reduce frictional resistance between fibers and between fibers and processing equipment, thereby minimizing processing defects such as fiber breakage and fuzzing, and ensuring consistent molding. However, these lubricants are mostly organic components, making them difficult to completely remove through conventional cleaning after processing. Residual lubricants can adhere to and bind with the inorganic epoxy resin coating and the fiber substrate, leading to poor interfacial compatibility and problems such as weak adhesion and easy peeling of the insulation layer. More importantly, during the subsequent high-temperature baking and curing process of wires and cables (typically at 150-300℃, and even higher for some special cables), residual organic lubricants undergo thermal decomposition and volatilization. The resulting gases accumulate inside the insulation layer and break through the incompletely cured paint film, ultimately causing through-cracks and micro-voids in the insulation layer. These defects significantly reduce the density of the insulation structure, weakening not only core performance characteristics such as breakdown voltage and resistance to damp heat, but also providing channels for the penetration of external moisture and impurities, further exacerbating the risk of cable aging and failure. In summary, the inherent brittleness and polarity of inorganic fiber filaments, the unavoidable defects such as broken filaments and micro-cracks during processing, coupled with the interfacial bonding problems caused by lubricant residue and insulation defects at high temperatures, these three factors combine to greatly limit their application effectiveness and reliability in high-temperature and fire-resistant wires and cables.

[0005] Currently, heat treatment (350-550℃) and chemical solvent cleaning (acetone, compound solvents) are commonly used to remove sizing agents, especially stubborn sizing agents such as epoxy and silicone-based agents. However, there is an irreversible contradiction between sizing agent removal and strength. This is manifested in the following ways: while heat treatment can efficiently remove sizing agents, the high temperature will damage the network structure of inorganic fiber filaments, reducing their tensile strength; and in chemical solvent cleaning, organic solvents will corrode the surface of inorganic fiber filaments, exacerbating the propagation of microcracks.

[0006] Therefore, there is an urgent need for an inorganic fiber protective material with strong flexibility and waterproof performance. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an inorganic fiber protective material and its preparation method.

[0008] To achieve the above and other related objectives, the present invention is obtained through the following technical solution.

[0009] A first aspect of the present invention is to provide an inorganic fiber protective material, comprising component A and component B, wherein component A comprises the following components in parts by weight:

[0010] 4-15 parts of inorganic powder

[0011] 5-15 parts of water-based resin

[0012] 5-15 parts water;

[0013] Component B comprises the following components in parts by weight:

[0014] 3-10 parts of silicone resin

[0015] 15-30 parts of ethanol

[0016] 0.5-3 parts xylene

[0017] 0.1-0.5 parts ammonia water.

[0018] Another aspect of the present invention is to provide a method for preparing the protective material as described above, comprising the following steps:

[0019] 1) Preparation of component A: Inorganic powder, aqueous resin and water are mixed to obtain component A;

[0020] 2) Preparation of component B: Mix organosilicon resin, ethanol, xylene and ammonia to obtain component B.

[0021] Another aspect of the present invention is to provide a cable with a protective layer, comprising a cable core and inorganic fiber filaments wrapped around the cable core, the inorganic fiber filaments being covered with a protective layer obtained by coating with the protective material as described above.

[0022] Another aspect of the present invention is to provide a method for preparing a cable as described above, comprising: coating component A onto an inorganic fiber filament wrapped around a cable core, performing a first curing, calcining, then coating component B and performing a second curing, thereby obtaining the cable.

[0023] As described above, the inorganic fiber protective material and its preparation method of the present invention have the following beneficial effects:

[0024] The inorganic fiber protective material of the present invention can effectively repair the inherent defects of inorganic fibers (such as easy fiber breakage) and form a smooth, moisture-resistant protective layer on the surface of inorganic fibers, effectively solving the problems of inorganic fibers being not moisture-resistant and being easily broken during cable insulation processing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the contact angle test of the present invention. Detailed Implementation

[0026] The first aspect of this invention protects an inorganic fiber protective material, comprising component A and component B, wherein component A comprises the following components in parts by weight:

[0027] 4-15 parts of inorganic powder

[0028] 5-15 parts of water-based resin

[0029] 5-15 parts water;

[0030] Component B comprises the following components in parts by weight:

[0031] 3-10 parts of silicone resin

[0032] 15-30 parts of ethanol

[0033] 0.5-3 parts xylene

[0034] 0.1-0.5 parts ammonia water.

[0035] In this invention, component A is a bipolar suspension emulsion containing inorganic oxide gel microparticles with a polarity similar to that of inorganic fiber filaments and an aqueous resin, which facilitates the adhesion of component A to the surface of the inorganic fiber filaments. In subsequent use, component A is coated onto the surface of the inorganic fiber filaments and cured by heating to form a defect repair layer. During this stage, the inorganic oxide gel microparticles fill the microcracks in the inorganic fiber filaments and defects caused by localized filament breakage. Subsequently, calcination causes the aqueous resin to volatilize, creating an inorganic environment, and allowing the inorganic oxide gel microparticles to firmly embed into the microcracks and defects caused by localized filament breakage in the inorganic fiber filaments. The aqueous resin decomposes, forming surface voids and cracks, which, together with the fine burrs caused by the breakage of the inorganic fiber filaments, form a rough substrate interface. This substrate interface facilitates the subsequent adsorption of component B. Therefore, component A can better repair the inorganic fiber filaments. Component B of this invention comprises silicone resin, ethanol, xylene, and ammonia. Ethanol serves as the main solvent and is subsequently volatile; xylene acts as a co-solvent, causing the silicone resin particles to swell, reducing the density of the silicone resin, and allowing it to suspend better in the solvent; ammonia slows down the evaporation rate of the two solvents, extending shelf life. Component B also improves the toughness and water resistance of the inorganic fiber filaments. Through the synergistic effect of components A and B, this invention significantly enhances the overall performance of inorganic fiber filaments, particularly their flexibility and water resistance.

[0036] In some embodiments, the inorganic powder may be 4-15 parts by weight, or 4-9 parts, or 8-12 parts, or 10-15 parts, or 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, or 15 parts.

[0037] In some embodiments, the aqueous resin may be 5-15 parts, 5-10 parts, 11-15 parts, or 5 parts, 6 parts, 7 parts, 8 parts, 10 parts, 12 parts, 14 parts, or 15 parts.

[0038] In some embodiments, the water can be 5-15 parts, 5-10 parts, 11-15 parts, or 5, 6, 7, 8, 10, 12, 14, or 15 parts.

[0039] In some embodiments, the silicone resin may be 3-10 parts, 3-8 parts, 5-10 parts, or 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, or 10 parts.

[0040] In some embodiments, the ethanol can be 15-30 parts, 15-21 parts, 20-30 parts, or 15, 16, 17, 18, 20, 22, 24, 25, 27, 28, or 30 parts.

[0041] In some embodiments, the xylene can be 0.5-3 parts, 0.5-1.8 parts, 1.5-3 parts, or 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts.

[0042] In some embodiments, the ammonia water can be 0.1-0.5 parts, or 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts.

[0043] In some embodiments, the inorganic fiber filament is selected from one or more of glass fiber filament, quartz fiber filament, and alumina fiber filament.

[0044] In some embodiments, the inorganic fiber filament is selected from quartz fiber filament.

[0045] In some embodiments, the inorganic fiber monofilament has a linear density of 50-72 tex and a diameter of 9-11 μm.

[0046] In some embodiments, the weight-average molecular weight of the silicone resin is 2500-2700 g / mol. In this invention, the weight-average molecular weight of the silicone resin cannot be too high or too low. If the weight-average molecular weight is too low, the stability is poor and it is prone to volatilization and loss; if the weight-average molecular weight is too high, swelling and insolubility will occur, making it impossible to prepare a homogeneous silicone resin solution.

[0047] In some embodiments, the silicone resin is selected from one or more of methyl silicone resin, phenyl silicone resin, and methylphenyl silicone resin. In one specific embodiment, it is methyl silicone resin JG-1101. The viscosity of the silicone resin at 25°C is 1000-6000 mPa•S.

[0048] In some embodiments, the inorganic powder is selected from one or more of silicon dioxide, magnesium oxide, and aluminum oxide.

[0049] In some embodiments, the inorganic powder is a mixture of silicon dioxide and aluminum oxide.

[0050] In some embodiments, the mass ratio of silicon dioxide to aluminum oxide is (3-10):(1-5), or it can be (3-10):1, (3-10):1.5, (3-10):2, (3-10):2.5, (3-10):3, (3-10):3.5, (3-10):4, (3-10):4.5, (3-10):5, or it can be 3:2, 5:2, 2:1, or 5:1.

[0051] In some embodiments, the aqueous resin is selected from aqueous silicone resins and / or aqueous epoxy resins.

[0052] In some embodiments, the waterborne silicone resin is selected from one or more of waterborne epoxy resin, waterborne acrylic resin, waterborne polyurethane resin, and waterborne alkyd resin.

[0053] In some specific embodiments, the waterborne silicone resin is selected from waterborne silicone resin SW303. The viscosity of the waterborne silicone resin at 25°C is 50-300 mPa•S.

[0054] In some embodiments, the aqueous epoxy resin is a self-emulsifying type epoxy resin with a medium viscosity, having a viscosity in the range of 9000-13000 cps at 25°C.

[0055] Another aspect of the present invention protects a method for preparing the protective material described above, comprising the following steps:

[0056] 1) Preparation of component A: Inorganic powder, aqueous resin and water are mixed to obtain component A;

[0057] 2) Preparation of component B: Mix organosilicon resin, ethanol, xylene and ammonia to obtain component B.

[0058] In some embodiments, in step 1), the mixing temperature is 50°C-70°C, or it can be 50°C, 60°C, or 70°C. At this temperature, it is more conducive to the uniform mixing of the inorganic powder and the aqueous resin.

[0059] In some implementations, in 1), the mixing time is 30-120 min, or it can be 30-80 min, or it can be 60-100 min, or it can be 90-120 min, such as 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, 110 min, or 120 min.

[0060] In some embodiments, in step 2), the mixing temperature is 20°C-50°C, or it can be 20°C, 30°C, 40°C, or 50°C. The mixing temperature of this invention should not be too high, as this can easily cause cross-linking of the silicone resin.

[0061] In some implementations, in 2), the mixing time is 5-30 min, or it can be 5-14 min, or it can be 10-20 min, or it can be 15-30 min, such as 5 min, 8 min, 10 min, 15 min, 20 min, 25 min, or 30 min.

[0062] Another aspect of the present invention protects a cable having a protective layer, the cable comprising a cable core and inorganic fiber filaments wrapped around the cable core, the inorganic fiber filaments being covered with a protective layer obtained by coating with a protective material as described above.

[0063] In some embodiments, the wire core is selected from one or more of nickel-plated conductor cores, nickel-plated copper conductor cores, nickel-silicon copper conductor cores, and nickel-chromium copper conductor cores.

[0064] In some embodiments, the wire core is selected from nickel-plated conductor cores.

[0065] In some implementations, when inorganic fiber filaments are used for wrapping, the wrapping overlap rate is 50-70%.

[0066] Another aspect of the present invention protects a method for preparing the cable as described above, comprising: coating component A onto inorganic fiber filaments wrapped around a cable core, performing a first curing, calcining, then coating component B and performing a second curing to obtain the cable.

[0067] In some embodiments, the coating is applied by immersion.

[0068] In some embodiments, the coating temperature is 10-50°C, or it can be 10°C, 20°C, 30°C, 40°C, or 50°C.

[0069] In some embodiments, the coating time is 5-20 min, or 5-14 min, or 10-20 min, such as 5 min, 8 min, 10 min, 15 min, or 20 min.

[0070] In some embodiments, the temperature for the first curing is 150-220°C, but can also be 150°C, 170°C, 180°C, 190°C, 200°C, 210°C, or 220°C.

[0071] In some embodiments, the first curing time is 5-30 min, or it can be 5-14 min, or it can be 10-20 min, or it can be 15-30 min, such as 5 min, 8 min, 10 min, 15 min, 20 min, 25 min, or 30 min.

[0072] In some embodiments, the calcination temperature is 350-450℃, or it can be 350℃, 370℃, 390℃, 400℃, 420℃, 440℃, or 450℃. This invention uses calcination to firmly embed inorganic powders such as oxides into the microcracks and defects caused by localized fiber breakage in the inorganic fibers. Simultaneously, the aqueous resin undergoes thermal decomposition to further fill surface defects and microcracks, and together with the fine burrs generated by the broken inorganic fibers, forms a rough base surface on the fiber surface, facilitating the adsorption of component B in the subsequent surface coating. The calcination temperature of this invention cannot be too high or too low. If the calcination temperature is too low, the thermal decomposition process of the aqueous resin will be delayed, not only taking longer but also making it difficult for the decomposition reaction to proceed fully. At the same time, the inorganic powder cannot efficiently complete diffusion, rearrangement, and localized sintering within the inorganic fibers, making it difficult to form a dense and continuous structural network. If the calcination temperature is too high, the insulating adhesive system is prone to prematurely entering the inorganic ceramization stage, ultimately leading to a significant decrease in the flexibility of the inorganic fiber matrix.

[0073] In some embodiments, the calcination time is 10-60 min, or it can be 10-25 min, 20-40 min, or 30-60 min, such as 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, or 60 min. The calcination time of this invention cannot be too short or too long. If the calcination time is too short, the organic components such as the water-based resin will not be sufficiently removed; if the time is too long, it will reduce production efficiency.

[0074] In some embodiments, the second curing temperature is 180-250℃, or it can be 180℃, 190℃, 200℃, 210℃, 220℃, 240℃, or 250℃. This invention improves moisture resistance through baking curing. The second curing temperature of this invention cannot be too high or too low. If the second curing temperature is too low, the free and bound water in component B will be difficult to completely remove, easily forming pore defects inside the inorganic fiber filaments; if the second curing temperature is too high, it will cause thermal degradation or crystal transformation of the inorganic fiber filaments, thereby destroying their original mechanical structure.

[0075] In some embodiments, the second curing time is 5-30 minutes, or it can be 5-14 minutes, 10-20 minutes, or 15-30 minutes, such as 5 minutes, 8 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, or 30 minutes. The second curing time of this invention cannot be too short or too long. If the second curing time is too short, the curing will be incomplete; if the second curing time is too long, it will affect production efficiency.

[0076] In some embodiments, the inorganic fibers are pretreated by washing with an organic solvent.

[0077] In some embodiments, the organic solvent is selected from one or more of acetone, ethanol, and xylene.

[0078] In some specific embodiments, the organic solvent is acetone and ethanol.

[0079] Preferably, the volume ratio of acetone to ethanol is 1:(1-3). More preferably, it is 1:3.

[0080] In some specific embodiments, the organic solvent is acetone and xylene. Preferably, the volume ratio of acetone to xylene is (1-3):1. More preferably, it is 3:2.

[0081] In some implementations, the washing is performed at least once.

[0082] In some specific implementations, the washing is performed twice.

[0083] In some more specific embodiments, the inorganic fibers are first washed once with an organic solvent formed from acetone and ethanol, and then washed once with an organic solvent formed from acetone and xylene. The present invention first washes the inorganic fibers with an organic solvent formed from acetone and ethanol to remove the wetting agent from the surface of the inorganic fibers, providing powerful cleaning; the subsequent washing with an organic solvent formed from acetone and xylene is to better wet the inorganic fibers with component A, thereby facilitating the repair of the inorganic fibers by component A and the increase of the toughness of the inorganic fibers by component B.

[0084] In some embodiments, the drying process also includes a polishing process.

[0085] In some implementations, the polishing process is performed using polishing powder.

[0086] In some specific embodiments, the polishing powder comprises dioxide, alumina, and zirconium oxide. In this invention, the cable, after a second curing process, is treated with the polishing powder, which helps remove residual burrs and particles from the fiber surface, thereby forming a smooth surface.

[0087] In some specific embodiments, the polishing process is performed at a speed of 20-200 m / min.

[0088] This invention utilizes bipolar suspended particles in a suspension (i.e., component A) to effectively fill surface microcracks and defects caused by localized wire breakage in inorganic fiber filaments. Calcination at 350℃-450℃ causes oxide gel microparticles (inorganic powder) to firmly embed into the microcracks and defects in the inorganic fiber filaments. Waterborne silicone, waterborne epoxy, and other waterborne resins decompose to form surface voids and cracks, which, together with the fine burrs from wire breakage, form a rough base surface on the inorganic fiber filaments, facilitating the adsorption of the coating formed by surface component B. This invention uses a low-viscosity suspension (i.e., component A) for coating, rather than a solution, effectively controlling the coating thickness while increasing void-filling efficiency. Furthermore, inorganic polishing powder is used, leveraging the minute friction of the powder and the high-speed relative motion during the wire twisting process to polish the inorganic fiber filaments, thereby forming a cable with a smooth surface and protective layer.

[0089] The inorganic fiber protective material of the present invention utilizes the gradient conversion of polarity between raw material components (that is, component A is bipolar, which is calcined to form strong polarity, and then component B is coated to form weak polarity), which not only effectively repairs the inherent defects of inorganic fiber filaments, but also forms a smooth, moisture-resistant protective layer on the surface of the fiber filaments, effectively solving the problems of moisture resistance and easy breakage of inorganic fiber filaments during cable insulation processing.

[0090] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0091] Before further describing specific embodiments of the present invention, it should be understood that the scope of protection of the present invention is not limited to the specific embodiments described below; it should also be understood that the terminology used in the embodiments of the present invention is for describing specific embodiments and not for limiting the scope of protection of the present invention; in the specification and claims of the present invention, unless otherwise expressly stated in the text, the singular forms "a", "an" and "this" include the plural forms.

[0092] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. In addition to the specific methods, apparatus, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description of this invention, any prior art methods, apparatus, and materials similar to or equivalent to those described, apparatus, and materials in the embodiments of this invention may be used to implement the present invention.

[0093] In the following embodiments of this application, the cable core is a nickel-plated conductor core with a diameter of 2.5 mm.

[0094] Water-based silicone resin; purchased from Changzhou Yuanen Synthetic Materials Co., Ltd., water-based silicone resin SW303, with a viscosity of 50-300 mPa•S at 25℃ and a density of 1.08 g / cm³ at 25℃. 3 .

[0095] Methyl silicone resin: purchased from Jiangxi Sibo Chemical Co., Ltd., JG-1101, with a viscosity of 1000-6000 mPa•S at 25℃.

[0096] Quartz inorganic fiber: purchased from Henan Shenjiu Tianhang New Material Co., Ltd., SJ101-51, with a linear density of 51 tex and a diameter of 11 μm.

[0097] Examples 1-4: An inorganic fiber protective material and its preparation method

[0098] The formulations for Examples 1-4 are shown in Table 1.

[0099] The formula is shown in Table 1.

[0100] The preparation method of component A is as follows: inorganic powder and aqueous resin are mixed at 50°C for 50 min, and then water is added and mixed at 50°C for another 30 min.

[0101] The preparation method of component B is as follows: organosilicon resin, ethanol, toluene and ammonia are mixed at 50°C for 30 min.

[0102] Comparative Example 1

[0103] The difference between Comparative Example 1 and Example 1 is that component A is not coated, while the remaining steps and raw materials are the same as in Example 1.

[0104] Comparative Example 2

[0105] The difference between Comparative Example 2 and Example 1 is that component B is not coated, while the remaining steps and raw materials are the same as in Example 1.

[0106] Comparative Example 3

[0107] The difference between Comparative Example 3 and Example 1 is that component B is coated first, followed by component A, while the remaining steps and raw materials are the same as in Example 1.

[0108] Examples 5-8 Cables with protective layers and their preparation methods

[0109] Cables wrapped with inorganic fiber filaments are treated with the protective materials described in Examples 1-4 to prepare cables with a protective layer. The process includes the following steps:

[0110] 1) Quartz inorganic fiber filaments are wrapped around the outer surface of the cable core, with a wrapping overlap rate of 50%.

[0111] 2) Inorganic fiber pretreatment:

[0112] It was then washed once with an organic solvent consisting of acetone and ethanol in a volume ratio of 1:3, and then washed once again with an organic solvent consisting of acetone and xylene in a volume ratio of 3:2.

[0113] 3) Coating component A, first curing and calcination

[0114] The washed product from step 2) is immersed in component A at 20°C for 10 min; then it undergoes a first curing at 150°C for 10 min; and then it is calcined at 350°C for 30 min.

[0115] 4) Coating component B, second curing

[0116] The calcined product from step 3) was immersed in component B at 50°C for 5 minutes; then cured a second time at 250°C for 30 minutes.

[0117] 5) Polishing

[0118] The product that has undergone the second curing treatment in step 4) is placed in polishing powder and polished at a line speed of 35m / min.

[0119] The polishing powder consists of 10 parts silica (1500 mesh), 3 parts alumina (1000 mesh), and 5 parts zirconium oxide (500 mesh).

[0120] Examples 1-4 were respectively obtained corresponding cables with protective layers through the above preparation methods, that is, Examples 5, 6, 7, and 8.

[0121] Meanwhile, Comparative Examples 1-3 were respectively obtained corresponding cables with protective layers through the above preparation methods.

[0122] Comparative Example 4

[0123] The difference from Example 5 is that: it was not washed a second time with acetone and xylene, and the rest was the same as Example 5.

[0124] Performance test of the cable with protective layer:

[0125] Test method for contact angle: Use a contact angle measuring instrument to drop a small amount of distilled water on the surface of the cable with a protective layer (that is, the cable polished in Step 5), and test the contact angle between the water droplet and the surface of the inorganic fiber wire. The test results of the contact angle are shown in Table 2.

[0126] Detection method for flexibility: Select a straight specimen with a length of not less than 1000 mm and a uniform and complete surface insulation layer (that is, the cable with a protective layer), wind the specimen tightly around a smooth round rod with a diameter of 5D of the nominal diameter of the conductor at a uniform speed of 10-20 r / min for 10 turns (adjacent coils have no overlap and no gap), observe the state of the insulation layer of the specimen with a magnifying glass with a magnification of ≥10 times. If there is no cracking, peeling, copper exposure, or obvious fuzzing, it is determined that the flexibility is qualified; at least 3 specimens should be tested during the test. Avoid stretching the conductor during the winding process to prevent the burrs of the round rod from scratching the insulation layer. Detect according to Test Method 8: Flexibility and Adhesion in Part 3: Mechanical Properties and Test Method 5: Resistance in Part 5: Electrical Properties of "Test Methods for Winding Wires" GB / T4074.1. The test results of flexibility and resistance are shown in Table 2. The flexibility of the cable refers to the ability of the cable to withstand bending without damage.

[0127] The contact angle (θ) is the angle between the liquid droplet formed by the liquid on the solid surface and the solid surface, which is used to quantify the wettability of the liquid to the solid. When θ > 90°, it shows hydrophobicity; when θ > 150°, it is superhydrophobic. The larger the contact angle, the better the waterproof performance.

[0128] Table 1 (weight, kg)

[0129]

[0130] Table 2

[0131] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Contact angle measurement (°) 118.5 113.7 118.2 113.5 85 95 99 100 flexibility Conductor diameter 5D without cracking Conductor diameter 5D without cracking Conductor diameter 5D without cracking Conductor diameter 5D without cracking Conductor diameter 5D cracking Conductor diameter 5D cracking Conductor diameter 5D cracking Conductor diameter 5D cracking Insulation resistance at room temperature (20℃) (MΩ•m) <![CDATA[2.57×10 11 ]]> <![CDATA[4.52×10 11 ]]> <![CDATA[1.54×10 12 ]]> <![CDATA[7.87×10 11 ]]> <![CDATA[2.05×10 10 ]]> <![CDATA[2.5×10 8 ]]> <![CDATA[3.85×10 7 ]]> <![CDATA[2.51×10 8 ]]>

[0132] As shown in Table 2, compared with Comparative Example 1 (without component A coating), Example 1 of the present invention, after coating with component A followed by component B, exhibited a 39.4% increase in contact angle and an order of magnitude increase in room temperature insulation resistance. Furthermore, the conductor diameter of 5D did not crack. This indicates that the lack of bipolar suspension emulsion coating (i.e., component A) resulted in poorer waterproof performance of the cable; it also made cracking more likely, leading to poorer mechanical properties and stability, significantly limiting its reliability and durability in practical use. In summary, component A plays a crucial role in repairing microcracks in inorganic fiber filaments and defects caused by localized filament breakage. As a vital component of cables, the microcracks and localized filament breakage of inorganic fiber filaments become weak points in cable performance, affecting not only waterproof and insulation performance but also reducing mechanical strength. Component A can effectively fill these microcracks and defects, enhance the bonding force between fiber filaments, and make the overall cable structure more compact and stable, thereby significantly improving the cable's waterproof, insulation, and mechanical properties, greatly enhancing its reliability and durability in practical use.

[0133] As shown in Table 2, compared with Comparative Example 2 which did not have component B coated, Example 1 of the present invention, after first coating component A and then coating component B, showed an increase of 3 orders of magnitude in room temperature insulation resistance and a 24.7% increase in contact angle. In addition, the conductor diameter of 5D did not crack. This indicates that the lack of coating with organic suspension emulsion (i.e., component B) significantly reduced the waterproof performance of the cable. Later, when moisture penetrated into the cable, it would corrode the cable and reduce its mechanical strength, just like the cracking that occurred when the conductor diameter was 5D.

[0134] As shown in Table 2, compared with Comparative Example 3, which applied component B first and then component A, Example 1 of the present invention, after applying component A first and then component B, showed an increase of 6 orders of magnitude in room temperature insulation resistance, no cracking of the conductor diameter of 5D, and decreased flexibility. In contrast, in Comparative Example 3, where component B was applied first and then component A, the residual organic components of the silicone resin continued to slowly volatilize during curing and calcination, leading to defects such as pinholes and cracks in the coating and resulting in poor insulation performance. Furthermore, coating the inorganic fiber surface with component B, which is composed of organic components, could not repair the cracks and defects on the inorganic fiber surface caused by cleaning with the wetting agent, making it prone to breakage.

[0135] In summary, components A and B work synergistically to construct a comprehensive protective layer with high hydrophobicity and flexibility. Component A improves the cable's structural strength and stability by repairing internal defects in the inorganic fibers; while component B forms an effective protective barrier on the cable surface, enhancing its waterproof and insulation properties, thus comprehensively improving the cable's hydrophobicity, flexibility, and insulation performance.

[0136] As can be seen from Table 2, compared with Comparative Example 4 which was not washed with organic solvents formed by acetone and xylene, Example 1 of the present invention, after two washes, although had good hydrophobic properties, had poor wetting between component A and inorganic fiber filaments, and even with component B coated, it still had poor flexibility and was prone to cracking.

[0137] In summary, this invention effectively repairs the inherent fragility of inorganic fibers by coating them with a bipolar component A followed by a weakly polar component A, thus forming a smooth, moisture-resistant protective layer on the surface of the inorganic fibers. This effectively solves the problems of moisture resistance and easy breakage of inorganic fibers during cable insulation processing.

[0138] The above embodiments are for illustrating the implementation schemes disclosed in this invention and should not be construed as limiting the invention. Furthermore, various modifications listed herein, as well as variations in the methods and compositions of the invention, will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been specifically described in conjunction with various specific preferred embodiments, it should be understood that the invention should not be limited to these specific embodiments. In fact, various modifications as described above that are obvious to those skilled in the art to obtain the invention should be included within the scope of this invention.

Claims

1. An inorganic fiber filament protective material comprising a component A and a component B, characterized in that, The A component comprises ingredients in the following weight parts: Inorganic powder 4-15 parts Water-based resin 5-15 parts Water 5-15 parts The B component comprises ingredients in the following weight parts: Silicone resin 3-10 parts Ethanol 15-30 parts Xylene 0.5-3 parts Ammonia 0.1-0.5 parts.

2. The armor of claim 1 wherein, The weight average molecular weight of the silicone resin is 2500-2700 g / mol; And / or, the inorganic fiber filaments are selected from one or more of glass fiber filaments, quartz fiber filaments and alumina fiber filaments; And / or, the inorganic powder is selected from one or more of silica, magnesium oxide and alumina; And / or, the silicone resin is selected from one or more of methyl silicone resin, phenyl silicone resin and methyl phenyl silicone resin.

3. The armor of claim 2 wherein, The water-based resin is selected from water-based silicone resin and / or water-based epoxy resin; And / or, the inorganic powder is a mixture of silica and alumina.

4. The armor of claim 3 wherein, The water-based silicone resin is selected from one or more of water-based epoxy resin, water-based acrylic resin, water-based polyurethane resin and water-based alkyd resin; And / or, the water-based epoxy resin is a self-emulsifying type of epoxy resin with medium viscosity, having a viscosity in the range of 9000-13000 cps at 25℃; And / or, the mass ratio of silica to alumina is (3-10):(1-5).

5. A method of producing a protective material according to any one of claims 1 to 4, wherein Comprising the following steps: 1) Preparation of the A component: mixing inorganic powder, water-based resin and water to obtain the A component; 2) Preparation of the B component: mixing silicone resin, ethanol, xylene and ammonia to obtain the B component.

6. A cable having a protective layer comprising a cable core and inorganic fiber filaments wrapped around the outside of the cable core, characterized in that, The inorganic fiber filaments are coated with a protective layer, which is obtained by applying the protective material as claimed in any one of claims 1-4.

7. The method of claim 6, wherein the cable is prepared by the steps of: Comprising: Coating component A on the inorganic fiber filaments wrapped around the cable core, first curing, calcination, then coating component B, second curing, to obtain the cable.

8. The method of claim 7, wherein the step of preparing is characterized by, The coating is by immersion; And / or, the calcination temperature is 350-450℃; And / or, the calcination time is 10-60 min; And / or, the inorganic fiber filaments are pretreated, the pretreatment being washing with an organic solvent; And / or, the second curing is followed by a polishing treatment.

9. The preparation method according to claim 8, characterized in that, The organic solvent is selected from one or more of acetone, ethanol and xylene; And / or, the washing is at least once; And / or, the polishing treatment is in a polishing powder.

10. The method of claim 9, wherein the step of preparing is characterized by, The polishing powder is selected from one or more of silica, alumina and zirconia; And / or, the polishing treatment speed is 20-200 m / min.

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