High-temperature heat-insulation noise-reduction far-infrared multifunctional composite woven body and preparation method thereof

Abstract

The invention provides a high-temperature heat-insulation noise-reduction far-infrared multifunctional composite woven body and a preparation method thereof, and relates to the technical field of textile functional materials.The method includes the steps that inorganic fiber yarn is subjected to surface modification to obtain functional yarn A, then the functional yarn A serves as wrap yarn, modified inorganic short fiber strips serve as core yarn, and functional yarn B is obtained through weaving; finally, the functional yarn A and the functional yarn B are woven into the high-temperature, heat-insulation, noise-reduction and far-infrared multifunctional composite woven body of a multi-layer structure, and the multifunctional composite woven body with the high-temperature resistance, the far-infrared performance, the heat preservation performance and the noise reduction performance at the same time can be manufactured by means of the structure and composition characteristics of the functional yarn A and the functional yarn B.

Description

Technical Field

[0001] The present invention relates to the technical field of textile functional materials, and in particular to a high-temperature heat-insulating, noise-reducing, and far-infrared multifunctional composite braid and a preparation method thereof. Background Art

[0002] With the rapid development of modern industry, the research on energy efficiency, environmental protection and safety of high-temperature industrial equipment (such as aluminum melting furnaces) has become a hot topic in the field. Industrial equipment has put forward the demand for "thermal insulation + silencer + far-infrared radiation" multifunctional integration of materials. Far-infrared radiation is conducive to improving energy utilization efficiency and achieving energy conservation and environmental protection. Silencer is a point that many high-temperature industries have overlooked. Realizing the silencer function is beneficial to the safety and health of the general public. Traditional materials are multi-layer composites, but this method will cause interlayer peeling during use, resulting in functional failure. Therefore, the demand for materials with structural stability and functional durability is becoming increasingly urgent. The 2.5D braid can weave layer structures with different functions into a whole. The structure of the composite braid is stable, lightweight, and multifunctional, which can meet the multifunctional integration requirements of "thermal insulation + silencer + far-infrared radiation".

[0003] In the prior art, a Chinese patent with publication number CN115897046A discloses a method for preparing a high-temperature resistant and infrared radiation-resistant alumina fiber static sealing material. The method comprises the following steps: twisting and plying alumina yarns, impregnating the alumina yarns in a composite impregnation liquid comprising alumina ceramic powder, a sunscreen, an adhesive, and a diluent, and drying the impregnated yarns to obtain alumina composite yarns; weaving the yarns online according to different weaving methods and weaving interface shapes, and preparing alumina fiber static sealing materials after heat treatment; the composite functional components optimize the infrared radiation barrier effect inside the fibers, thereby achieving a heat-insulating effect; and adopting three-dimensional weaving, utilizing fiber twisting, plying, and weaving processes to obtain a flexible, compressible, and deformable ultra-high-temperature static sealing material.

[0004] In addition, Chinese patent publication number CN119159876B discloses a multi-layered high-temperature resistant thermal insulation composite material and its preparation method, which achieves an excellent combination of the high-temperature resistance and ablation resistance of the upper panel and the bonding performance of the lower panel. It has a multi-layer structure: the upper panel is a high-density ceramic composite material layer with excellent heat protection, ablation resistance, erosion resistance, and load-bearing properties; the transition layer is a fiber felt reinforced ceramic composite material layer with functions such as thickness adjustment and thermal deformation matching; the middle layer is an aerogel insulation composite material layer, which performs heat insulation and load transfer functions; and the lower panel is a resin-based composite material layer, which performs high-strength bonding with the metal load-bearing structure. The above-mentioned existing technologies only focus on solving the interlayer bonding strength of the multi-layer composite, but ignore the development of integrated functional materials.

[0005] In view of this, it is necessary to design an improved high-temperature heat-insulating and sound-absorbing far-infrared multifunctional composite braid and its preparation method to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braid and a preparation method thereof.

[0007] To achieve the above-mentioned object of the invention, the present invention provides a method for preparing a high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braid, comprising the following steps:

[0008] S1. Mixing metal oxide powder and an oily coupling agent to form a mixed solution; impregnating inorganic fiber yarn with the mixed solution to form a layer of metal oxide on the surface of the yarn; then, applying a layer of foam adhesive to the surface of the yarn with the metal oxide layer, and then performing a hot pressing process to obtain functional yarn A;

[0009] S2. Using functional yarn A as the covering yarn and modified inorganic staple fiber strips as the core yarn, the functional yarn A and the inorganic staple fiber strips are composited together by weaving to obtain functional yarn B;

[0010] S3. Weave at least one of the functional yarn A and the functional yarn B to form a high-temperature resistant-far-infrared layer, and weave the functional yarn B to form a thermal insulation-heat insulation-soundproof layer. The thermal insulation-heat insulation-soundproof layer is formed between the two layers of the high-temperature resistant-far-infrared layers. The thermal insulation-heat insulation-soundproof layer and the high-temperature resistant-far-infrared layer are mutually entangled and connected through the interlayer angle interlocking structure between the yarns.

[0011] Preferably, in step S2, the weaving mode is 4-16 axes, the weaving speed is 1-5 m / min, and the weaving angle is 30°-60°.

[0012] Preferably, in step S1, the foam adhesive is prepared by mixing and foaming a composite adhesive, metal oxide powder and a surfactant, the concentration of the metal oxide powder in the foam adhesive is 15-30%, and the coating thickness of the foam adhesive is 0.1-0.5 mm.

[0013] Preferably, in step S1, the composite adhesive is one or more of phenolic-polyvinyl acetal, phenolic-chloroprene rubber, epoxy-phenolic, and acrylate copolymer; the metal oxide powder is one or more of iron oxide powder, magnesium oxide powder, and zinc oxide powder, and its particle size is 300-500 μm; the surfactant is one or more of fluorocarbon surfactant, fluorine-containing three-proof finishing agent, polyether modified silicone oil, PVC rare earth heat stabilizer, and rare earth composite flame retardant.

[0014] Preferably, in step S2, the modified inorganic short fiber strips are obtained by doping the metal oxide powder into the inorganic short fiber strips, and the doping amount of the metal oxide powder is 5-25% of the mass of the inorganic short fiber strips; the inorganic short fiber strips are one or more of alumina short fibers, quartz short fibers, and high silica glass short fibers, and their length is 5-25 mm.

[0015] Preferably, in step S3, the sum of the thicknesses of the two high temperature resistant-far infrared layers is 25-40% of the thickness of the composite braided body.

[0016] Preferably, the tissue structure of the high temperature resistant and far infrared resistant layer is one of a broken twill structure, a satin structure and a plain weave structure.

[0017] Preferably, in step S3, the tissue structure of the heat preservation-heat insulation-soundproofing layer is a honeycomb tissue structure, which is a single layer or multiple layers.

[0018] Preferably, in step S1, the concentration of the metal oxide powder in the mixed solution is 5-20%; the oily coupling agent is a silane coupling agent, a titanate coupling agent, a zirconium aluminate coupling agent, or an oily polymer coupling agent.

[0019] In particular, the high-temperature heat-insulating, sound-absorbing, and far-infrared multifunctional composite braided body prepared by the preparation method provided by the present invention comprises:

[0020] Thermal insulation-insulation-soundproof layer, which is a single-layer or multi-layer honeycomb structure;

[0021] Two layers of high temperature resistant-far infrared layers include metal oxide powder layers. The two layers of high temperature resistant-far infrared layers are arranged between the two layers of high temperature resistant-far infrared layers, and the sum of the thickness of the two layers of high temperature resistant-far infrared layers is 25-40% of the thickness of the composite braid.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention provides a method for preparing a high-temperature heat-insulating, sound-absorbing, and far-infrared multifunctional composite braid. The method comprises the following steps: firstly performing surface modification on an inorganic fiber yarn to obtain a functional yarn A; then using the functional yarn A as the covering yarn and the modified inorganic staple fiber strips as the core yarn to weave a functional yarn B; finally, weaving the functional yarn A and the functional yarn B into a high-temperature heat-insulating, sound-absorbing, and far-infrared multifunctional composite braid having a multi-layer structure. The structural and compositional characteristics of the functional yarn A and the functional yarn B can be utilized to obtain a multifunctional composite braid having high temperature resistance, far-infrared properties, thermal insulation properties, and sound-absorbing properties.

[0024] 2. The preparation method proposed in the present invention uses the functional yarn obtained from inorganic fiber yarn as the covering yarn and the modified inorganic staple fiber strip as the core yarn, and through the regulation of the weaving parameters, effectively improves the covering density between the covering yarn and the core yarn, thereby utilizing the interaction between the two components to improve the far-infrared performance and high-temperature thermal insulation performance of the functional yarn B; in addition, by using the modified inorganic staple fiber strip as the core yarn and covering it with functional yarn during the weaving process, the size characteristics of the staple fiber can be fully utilized, and the fibers are still in a state of incomplete close contact after weaving, thereby giving the functional yarn B a certain tensile deformation ability and toughness, overcoming the defect that the inorganic fiber itself is not resistant to bending.

[0025] 3. The preparation method proposed in the present invention can provide far-infrared function for the composite material by doping metal oxide powder into the inorganic yarn. At the same time, the introduction of metal oxide powder can disperse stress, fill pores, and improve the tensile strength and fracture toughness of the yarn; on the other hand, it can also effectively exert the high temperature resistance and heat insulation properties of the metal oxide powder and the inorganic yarn, giving the composite material excellent overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the high-temperature heat-insulating, noise-reducing, and far-infrared multifunctional composite braided body proposed in the present invention;

[0027] Figure 2 Schematic diagram of the structure of the functional yarn B prepared in Example 1 of the present invention;

[0028] Figure 3 This is a model distribution diagram of the honeycomb structure in the composite braided body prepared in Example 1 of the present invention;

[0029] Figure 4 This is a machine-mounted image of the honeycomb structure in the composite braided body produced in Example 1 of the present invention;

[0030] Figure 5 Schematic diagram of the interlayer angle interlocking structure of the composite braid prepared in Example 1 of the present invention;

[0031] The reference numerals are as follows:

[0032] 1. Alumina short fiber strips; 2. Metal oxide powder; 3. Functional yarn A; 4. Functional yarn B; 11. High temperature resistant and far infrared layer; 12. Thermal insulation and soundproofing layer. DETAILED DESCRIPTION

[0033] In order to make the objectives, 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.

[0034] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0035] 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 includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0036] See also Figure 1 As shown, the present invention provides a high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braided body, which comprises:

[0037] The heat preservation, heat insulation and sound-absorbing layer 12 is a single-layer or multi-layer honeycomb structure;

[0038] Two layers of high temperature resistant and far infrared layers 11 include metal oxide powder layers. The heat preservation, heat insulation and soundproofing layer 12 is formed between the two layers of high temperature resistant and far infrared layers 11. The sum of the thicknesses of the two layers of high temperature resistant and far infrared layers 11 is 25-40% of the thickness of the composite braid.

[0039] Furthermore, the present invention also provides a method for preparing the above-mentioned high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braid, comprising the following steps:

[0040] S1. Preparation of functional yarn A:

[0041] Mixing metal oxide powder with an oily coupling agent to form a mixed solution; immersing inorganic fiber yarn in the mixed solution for 1-2 hours to remove the oily coupling agent on the yarn surface, thereby forming a layer of metal oxide on the yarn surface; then, applying a layer of foam adhesive to a thickness of 0.1-0.5 mm on the yarn surface with the metal oxide layer, and then subjecting the yarn to a heat pressing treatment to obtain functional yarn A;

[0042] S2. Preparation of functional yarn B:

[0043] Functional yarn A is used as the covering yarn and modified inorganic staple fiber strips are used as the core yarn. Functional yarn A and inorganic staple fiber strips are composited together by weaving. During the weaving process, functional yarn A is wound around the core yarn in a spiral cross manner to obtain functional yarn B.

[0044] S3. Preparation of composite braid:

[0045] At least one of the functional yarn A and the functional yarn B is woven to form a high-temperature resistant-far-infrared layer 11, and the functional yarn B is woven to form a thermal insulation-heat-insulating-sound-absorbing layer 12. The thermal insulation-heat-insulating-sound-absorbing layer 12 is formed between the two layers of the high-temperature resistant-far-infrared layers 11. The thermal insulation-heat-insulating-sound-absorbing layer 12 and the high-temperature resistant-far-infrared layer 11 are mutually intertwined and connected through the interlayer angle interlocking structure between the yarns. The two layers of the high-temperature resistant-far-infrared layers 11 and the one layer of the thermal insulation-heat-insulating-sound-absorbing layer 12 together constitute a composite braided body.

[0046] In the above technical solution, by doping metal oxide powder into the inorganic yarn, the composite material can be provided with far-infrared function. At the same time, the introduction of metal oxide powder can disperse stress, fill pores, and improve the tensile strength and fracture toughness of the yarn; on the other hand, it can also effectively exert the high temperature resistance and heat insulation of the metal oxide powder and inorganic yarn, giving the composite material excellent overall performance.

[0047] Furthermore, the functional yarn obtained from inorganic fiber yarn is used as the covering yarn, and the modified inorganic staple fiber strip is used as the core yarn. By regulating the weaving parameters, the covering density between the covering yarn and the core yarn is effectively improved, thereby utilizing the interaction between the two components to improve the far-infrared performance and high-temperature thermal insulation performance of the functional yarn B. In addition, generally speaking, the fabric obtained from inorganic fiber yarn is prone to breakage after bending, the fabric has small deformation ability and poor toughness, and the yarn B obtained by using modified inorganic staple fiber strip as the core yarn and wrapping it with functional yarn during the weaving process has a special core-wrapped structure. When the fabric is deformed and bent, the deformation of yarn B can resist such structural damage and restore the composite braid to its original state. Although yarn A has insufficient deformation toughness, it can provide strong mechanical tensile properties. Yarn A and yarn B act as the skeleton and muscle respectively. The composite braid can have strong structural stability and good deformation ability, overcoming the defect that inorganic fiber yarn / fabric is not resistant to bending.

[0048] In addition, the composite braided body is made of inorganic fiber yarn and metal powder as a whole, so it has certain high temperature resistance. The high temperature resistant-far infrared layer 11 reflects the heat emitted by the heat source in the form of far infrared through the far infrared function, thereby improving the energy utilization efficiency; the thermal insulation-insulation-soundproofing layer 12 achieves thermal insulation-insulation-soundproofing through evenly distributed air cavities and rich pores in the yarn structure, and the interlayer angle interlocking structure can avoid the gaps between different functional layers that affect the overall performance.

[0049] In some embodiments, in step S1, the metal oxide powder is one or more of iron oxide powder, magnesium oxide powder, and zinc oxide powder, and its particle size is 300-500 μm; the oily coupling agent is specifically a silane coupling agent, a titanate coupling agent, a zirconium aluminate coupling agent, and an oily polymer coupling agent; and the concentration of the metal oxide powder in the mixed solution is 5-20%.

[0050] In some embodiments, in step S1, a foam adhesive is prepared by mixing a composite adhesive, metal oxide powder, and a surfactant with air through a foaming device, wherein the concentration of the metal oxide powder in the foam adhesive is 15-30%. The composite adhesive is one or more of phenolic-polyvinyl acetal, phenolic-chloroprene rubber, epoxy-phenolic, and acrylate copolymers; the metal oxide powder is one or more of iron oxide powder, magnesium oxide powder, and zinc oxide powder, with a particle size of 300-500 μm; and the surfactant is one or more of fluorocarbon surfactant, fluorine-containing three-proofing finishing agent, polyether-modified silicone oil, PVC rare earth heat stabilizer, and rare earth composite flame retardant.

[0051] In some embodiments, in step S1 , the inorganic fiber yarn is a filament yarn formed of at least one of alumina, quartz, and high-silica glass, and has a linear density of 60-240 tex.

[0052] In some embodiments, in step S1 , the temperature of the hot pressing treatment is 200° C., the pressure is 10 MPa, and the time is 1 hour.

[0053] In some embodiments, in step S2, the modified inorganic short fiber strips are obtained by doping metal oxide powder into the inorganic short fiber strips, and the doping amount of the metal oxide powder is 5-25% of the mass of the inorganic short fiber strips. The metal oxide powder is specifically one or more of iron oxide powder, magnesium oxide powder, and zinc oxide powder, and its particle size is 300-500μm; the inorganic short fiber strips are one or more of alumina short fibers, quartz short fibers, and high silica glass short fibers, and the fiber length is 5-25mm.

[0054] In some embodiments, in step S2, the braiding method is 4-16 axes, the braiding speed is 1-5 m / min, and the braiding angle is 30°-60°. The amount of core yarn used in the braiding process can be determined based on the length of the covering yarn / functional yarn A. For example, if the required functional yarn B is 10 cm long and 5 mm in diameter, and the braiding angle is 45°-70°, the required functional yarn A is 0.5-5 g, and the required core yarn length is approximately 10 cm and the mass is 0.05-0.5 g.

[0055] In some embodiments, in step S3, the sum of the thicknesses of the two high-temperature resistant-far-infrared layers 11 is 25-40% of the thickness of the composite woven body, and the tissue structure of the high-temperature resistant-far-infrared layer 11 is one of a broken twill structure, a satin structure, and a plain weave structure, preferably a broken twill structure.

[0056] In some embodiments, in step S3, the thermal insulation and sound-absorbing layer 12 has a honeycomb structure, which may be a single layer or multiple layers. In certain specific embodiments, the honeycomb structure is arranged in the form of evenly distributed pyramids within the composite braid, with four adjacent pyramids arranged in the same rectangular shape. The height of the honeycomb structure is 3-15 mm, and the side length is 5-15 mm.

[0057] The high-temperature heat-insulating, noise-reducing, far-infrared multifunctional composite braid provided by the present invention and its preparation method are further described below with reference to specific embodiments:

[0058] Example 1

[0059] This embodiment prepares a high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braid, and the specific preparation method includes the following steps:

[0060] S1. Preparation of functional yarn A:

[0061] Zinc oxide powder is mixed with 3-aminopropyltriethoxysilane to form a mixed solution; an alumina yarn with a linear density of 120 tex is immersed in the mixed solution for 2 hours, and after the immersion, the yarn is placed in anhydrous ethanol for ultrasonic treatment to remove the silane coupling agent on the yarn surface, forming a layer of metal oxide on the yarn surface, and further enhancing the surface mechanical effect of the yarn so that it will not be loose when subsequently cut; then, a layer of foam adhesive with a thickness of 0.2 mm is scraped on the surface of the yarn with the metal oxide layer formed on the surface, and then heat-treated at 180°C for 2 hours under 10 MPa conditions to obtain functional yarn A; wherein the concentration of zinc oxide powder in the mixed solution is 18%, the particle size of the zinc oxide powder is 450 μm, and the foam adhesive is obtained by mixing phenolic-polyvinyl acetal, zinc oxide powder and polyether modified silicone oil with air through a foaming device, and the proportion of zinc oxide powder in the foam adhesive is 15%, the proportion of polyether modified silicone oil is 10%, and the balance is phenolic-polyvinyl acetal;

[0062] S2. Preparation of functional yarn B:

[0063] The functional yarn A obtained in step S1 is used as the covering yarn, and the modified alumina staple fiber strip is used as the core yarn. The functional yarn A and the modified alumina staple fiber strip are compounded together by weaving to obtain the functional yarn B. The weaving method is 8-axis, the weaving speed is 3.8m / min, the weaving angle is 60°, the weaving length is 10cm, and the yarn B has a diameter of 5mm. The required functional yarn A is 2.0g, and the required modified inorganic staple fiber strip is about 10cm long and has a mass of 0.3g. Among them, the modified inorganic staple fiber strip is obtained by doping the zinc oxide powder in step S1 into the alumina staple fiber strip, and the doping amount of the metal oxide powder is 15% of the mass of the alumina staple fiber strip, and the length of the alumina staple fiber strip is 15mm. The structural schematic diagram of the functional yarn B is shown in FIG. Figure 2 As shown, 1 is alumina short fiber strips, 2 is metal oxide powder, and 3 is functional yarn A;

[0064] S3. Preparation of composite braid:

[0065] Functional yarn A is woven to form a high-temperature resistant-far-infrared layer 11, and functional yarn B is woven to form a thermal insulation-heat-insulating-sound-absorbing layer 12. The thermal insulation-heat-insulating-sound-absorbing layer 12 is formed between the two layers of high-temperature resistant-far-infrared layers 11. The thermal insulation-heat-insulating-sound-absorbing layer 12 and the high-temperature resistant-far-infrared layer 11 are intertwined and connected with each other through the interlayer angle interlocking structure between the yarns. The warp yarn used in the weaving process is functional yarn B, and the weft yarn is functional yarn A, functional yarn B, and functional yarn A. Three weft yarns are cyclically beaten and woven.

[0066] Two layers of high-temperature-resistant and far-infrared layers 11 and one layer of heat-insulating, heat-retaining, and sound-reducing layer 12 together form a three-layer composite braid with a thickness of 25 mm. The high-temperature-resistant and far-infrared layer 11 has a 3-up, 3-down warp-broken twill structure, while the heat-insulating, heat-retaining, and sound-reducing layer 12 has a single honeycomb structure based on a 1-up, 5-down diamond twill. The combined thickness of the two layers of high-temperature-resistant and far-infrared layers 11 is 30% of the composite braid's thickness. The model and machine diagram of the honeycomb structure are shown in Figures 1 and 2. Figure 3 and Figure 4 As shown, the honeycomb structure is in the form of pyramids in the composite braid, which are evenly distributed. Every four adjacent pyramids are arranged in the same rectangle. The height of the honeycomb structure is 4.1mm and the side length is 10.2mm. The schematic diagram of the interlayer angle interlocking structure in the composite braid is shown in Figure 5 As shown, in this figure, due to the angle problem, only the high temperature resistant-far infrared layer 11 can be observed.

[0067] It should be noted that, unless otherwise specified, the reagents and raw materials used in the present invention can be obtained from the market.

[0068] According to GB / T 10297-2015, "Determination of Thermal Conductivity of Non-metallic Solid Materials - Hot Wire Method," a hot wire was inserted into the composite braid produced in this example at 1000°C. The thermal conductivity was calculated based on the temperature response. The thermal conductivity was 0.082 W / (m·K), significantly superior to traditional refractory materials (e.g., ordinary refractory bricks have a thermal conductivity of approximately 1.0 W / (m·K)). The sound insulation performance of the composite braid was tested according to GB / T 19889.1-2005 and ISO 140-3. A composite braid with a thickness of approximately 50 mm was used to completely enclose the sound source. The resulting sound insulation Rw of the composite braid was 57 dB, significantly superior to the 50 dB overall sound insulation performance of industrial soundproof walls. A 25mm thick composite braided body sample and a standard blackbody plate were placed on a constant temperature hot plate. At the same temperature, the radiation intensity of the two was measured respectively using a far-infrared radiation measurement system covering the 5-14μm band. The emissivity was calculated and the emissivity of the composite braided body was 0.96, which is much higher than that of materials containing ceramic powder or nano-inorganic powder.

[0069] Example 2

[0070] This embodiment prepares a high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braid, and the specific preparation method includes the following steps:

[0071] S1. Preparation of functional yarn A:

[0072] Zinc oxide powder is mixed with an aluminate coupling agent to form a mixed solution; an alumina yarn with a linear density of 240 tex is immersed in the mixed solution for 1.5 hours, and after the impregnation, the yarn is placed in anhydrous ethanol for ultrasonic treatment to remove the oily polymer coupling agent on the yarn surface, thereby forming a layer of metal oxide on the yarn surface, and further enhancing the surface mechanical effect of the yarn so that it will not be loose when subsequently cut; then, a layer of fluorocarbon surfactant with a thickness of 0.3 mm is scraped on the surface of the yarn with the metal oxide layer formed on the surface, and then heat-treated at 200°C under 10 MPa for 1 hour to obtain functional yarn A; wherein the concentration of zinc oxide powder in the mixed solution is 10%, the particle size of the zinc oxide powder is 450 μm, and the foam adhesive is obtained by mixing phenolic-polyvinyl acetal, zinc oxide powder and fluorocarbon surfactant with air through a foaming device, and the proportion of zinc oxide powder in the foam adhesive is 20%, the proportion of fluorocarbon surfactant is 15%, and the balance is phenolic-polyvinyl acetal;

[0073] S2. Preparation of functional yarn B:

[0074] The functional yarn A prepared in step S1 is used as the covering yarn, and the modified alumina staple fiber strip is used as the core yarn. The functional yarn A and the modified alumina staple fiber strip are composited together by weaving to obtain a functional yarn B. The weaving method is 16 axes, the weaving speed is 4.5 m / min, the weaving angle is 45°, the weaving length is 10 cm, and the yarn B has a diameter of 5 mm. The required functional yarn A is 1.8 g, and the required modified inorganic staple fiber strip is approximately 10 cm long and weighs 0.3 g. The modified inorganic staple fiber strip is obtained by doping the zinc oxide powder prepared in step S1 into the alumina staple fiber strip. The doping amount of the metal oxide powder is 10% of the mass of the alumina staple fiber strip, and the length of the alumina staple fiber strip is 15 mm.

[0075] S3. Preparation of composite braid:

[0076] Functional yarn A is woven to form a high-temperature-resistant and far-infrared layer 11, and functional yarn B is woven to form a heat-insulating, heat-insulating, and sound-absorbing layer 12. The heat-insulating, heat-insulating, and sound-absorbing layer 12 is formed between the two layers of the high-temperature-resistant and far-infrared layers 11. The heat-insulating, heat-insulating, and sound-absorbing layer 12 and the high-temperature-resistant and far-infrared layers 11 are intertwined and connected to each other through an interlayer angle interlocking structure between the yarns. The two layers of the high-temperature-resistant and far-infrared layers 11 and the one layer of the heat-insulating, heat-insulating, and sound-absorbing layer 12 together constitute a three-layer composite braid with a thickness of 25 mm. The high-temperature-resistant and far-infrared layer 11 has a 3-up, 3-down broken twill structure, while the heat-insulating, heat-insulating, and sound-absorbing layer 12 has a single-layer honeycomb structure based on a 1-up, 4-down diamond twill structure. The honeycomb structure has a height of 3.7 mm and a side length of 8.3 mm. The combined thickness of the two layers of the high-temperature-resistant and far-infrared layers 11 is 25% of the thickness of the composite braid.

[0077] According to GB / T 10297-2015, "Determination of Thermal Conductivity of Non-metallic Solid Materials - Hot Wire Method," a hot wire was inserted into the composite braid produced in this example at 1000°C. The thermal conductivity was calculated based on the temperature response. The thermal conductivity was 0.076 W / (m·K), significantly superior to traditional refractory materials (e.g., ordinary refractory bricks have a thermal conductivity of approximately 1.0 W / (m·K)). The sound insulation performance of the composite braid was tested according to GB / T 19889.1-2005 and ISO 140-3. A composite braid with a thickness of approximately 50 mm was used to completely enclose the sound source. The test revealed a sound insulation rating (Rw) of 54 dB for the composite braid, significantly superior to the 50 dB overall sound insulation performance of industrial soundproof walls. A 25mm thick composite braided body sample and a standard blackbody plate were placed on a constant temperature hot plate. At the same temperature, the radiation intensity of the two was measured respectively using a far-infrared radiation measurement system covering the 5-14μm band. The emissivity was calculated and the emissivity of the composite braided body was 0.94, which is much higher than that of materials containing ceramic powder or nano-inorganic powder.

[0078] Examples 3 to 6

[0079] The only difference between Examples 3 to 6 and Example 1 is that in step S2, the weaving method for preparing functional yarn B is different from that in Example 1, and the process parameters are the same as those in Example 1, which will not be repeated here. The settings of the weaving methods in Example 1 and Examples 3 to 6 and the performance of the composite braid obtained under the corresponding conditions are shown in Table 1. From the data in the analysis table, it can be seen that the weaving method of the weaving process will affect the far-infrared, heat insulation and soundproofing performance of the composite braid, and within the range given by the present invention, the comprehensive performance of the composite braid obtained is the best. This is because a suitable range of braiding axis numbers is selected to avoid too low an axis number, which leads to a decrease in the coating density of the functional yarn A on the modified inorganic staple strips, thereby reducing the far-infrared function of the yarn surface and the sound insulation performance. At this time, due to the low coating density, the mechanical tensile properties of the yarn will also be reduced due to insufficient toughness. At the same time, it is also necessary to avoid excessive coating, which leads to the pores of yarn B losing tensile toughness and deformation ability due to extrusion loss, which also causes the thermal conductivity of the braid to increase.

[0080] Table 1. Braiding method settings in Example 1 and Examples 3 to 6 and properties of composite braids obtained under corresponding conditions

[0081]

[0082] Examples 7 to 10

[0083] The only difference between Examples 7 to 10 and Example 1 is that in step S2, the weaving speed when preparing the functional yarn B is different from that in Example 1, and the process parameters are the same as those in Example 1, which will not be repeated here. The settings of the weaving speeds in Example 1 and Examples 7 to 10 and the performance of the composite braid obtained under the corresponding conditions are shown in Table 2, as can be seen from the data in the analysis table. The weaving speed of the weaving process will affect the far-infrared and heat insulation and soundproofing properties of the composite braid. This is because when the weaving speed is too fast, the coating density of the functional yarn A on the modified inorganic staple fiber strips is reduced, which damages the far-infrared function of the yarn surface and reduces the sound insulation performance. When the weaving speed is too slow, repeated coating occurs at the same position of the modified inorganic staple fiber strips, resulting in the structure of the coated yarn being too tight, which reduces the heat insulation and soundproofing performance and also affects the tensile deformation ability of the yarn.

[0084] Table 2 Braiding speed settings in Example 1 and Examples 7 to 10 and properties of the composite braids obtained under the corresponding conditions

[0085]

[0086]

[0087] Examples 11 to 14

[0088] The only difference between Examples 11 to 14 and Example 1 is that in step S2, the braiding angle when preparing the functional yarn B is different from that in Example 1, and the process parameters are the same as those in Example 1, which will not be repeated here. The settings of the braiding angles in Example 1 and Examples 11 to 14 and the performance of the composite braid obtained under the corresponding conditions are shown in Table 3. From the analysis of the data in the table, it can be seen that the braiding angle in the braiding process will affect the far-infrared and heat-insulating sound-absorbing properties of the composite braid. This is because when the braiding angle is too large, the torsional state of yarn A will seriously increase the tangential strength of yarn B but is not conducive to axial deformation, reducing the tensile toughness of yarn B. When the braiding angle is too small, yarn A tends too much to the axial direction, reducing the coating density of the modified inorganic staple strips, and reducing the far-infrared function of the yarn surface and the sound insulation performance.

[0089] Table 3 Braiding angle settings in Example 1 and Examples 11 to 14 and properties of composite braids obtained under corresponding conditions

[0090]

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braid, characterized in that: The steps include: S1. Mixing metal oxide powder and an oily coupling agent to form a mixed solution; impregnating inorganic fiber yarn with the mixed solution to form a layer of metal oxide on the surface of the yarn; then, applying a layer of foam adhesive to the surface of the yarn with the metal oxide layer, and then performing a hot pressing process to obtain functional yarn A; S2. Using functional yarn A as the covering yarn and modified inorganic staple fiber strips as the core yarn, the functional yarn A and the inorganic staple fiber strips are composited together by weaving to obtain functional yarn B; S3. Weave at least one of the functional yarn A and the functional yarn B to form a high-temperature resistant-far-infrared layer, and weave the functional yarn B to form a thermal insulation-heat insulation-soundproof layer. The thermal insulation-heat insulation-soundproof layer is formed between the two layers of the high-temperature resistant-far-infrared layers. The thermal insulation-heat insulation-soundproof layer and the high-temperature resistant-far-infrared layer are mutually entangled and connected through the interlayer angle interlocking structure between the yarns.

2. The preparation method according to claim 1, characterized in that In step S2, the weaving method is 4-16 axes, the weaving speed is 1-5 m / min, and the weaving angle is 30°-60°.

3. The preparation method according to claim 1, characterized in that In step S1, the foam adhesive is prepared by mixing and foaming a composite adhesive, metal oxide powder and a surfactant. The concentration of the metal oxide powder in the foam adhesive is 15-30%, and the coating thickness of the foam adhesive is 0.1-0.5 mm.

4. The preparation method according to claim 3, characterized in that In step S1, the composite adhesive is one or more of phenolic-polyvinyl acetal, phenolic-chloroprene rubber, epoxy-phenolic, and acrylate copolymer; the metal oxide powder is one or more of iron oxide powder, magnesium oxide powder, and zinc oxide powder, and its particle size is 300-500 μm; the surfactant is one or more of fluorocarbon surfactant, fluorine-containing three-proof finishing agent, polyether modified silicone oil, PVC rare earth heat stabilizer, and rare earth composite flame retardant.

5. The preparation method according to claim 4, characterized in that In step S2, the modified inorganic short fiber strips are obtained by doping the metal oxide powder into the inorganic short fiber strips, and the doping amount of the metal oxide powder is 5-25% of the mass of the inorganic short fiber strips; the inorganic short fiber strips are one or more of alumina short fibers, quartz short fibers, and high-silica glass short fibers, and their length is 5-25 mm.

6. The preparation method according to claim 1, characterized in that In step S3, the sum of the thicknesses of the two high temperature resistant and far infrared layers is 25-40% of the thickness of the composite braided body.

7. The preparation method according to claim 6, characterized in that The organizational structure of the high temperature resistant and far infrared resistant layer is one of a broken twill structure, a satin structure, and a plain weave structure.

8. The preparation method according to claim 1, characterized in that In step S3, the tissue structure of the heat preservation-heat insulation-soundproof layer is a honeycomb tissue structure, which is a single layer or multiple layers.

9. The preparation method according to claim 1, characterized in that In step S1, the concentration of the metal oxide powder in the mixed solution is 5-20%; the oily coupling agent is a silane coupling agent, a titanate coupling agent, a zirconium aluminate coupling agent, or an oily polymer coupling agent.

10. A high-temperature heat-insulating, sound-absorbing, far-infrared multifunctional composite braided body prepared by the preparation method according to any one of claims 1 to 9, characterized in that: include: Thermal insulation-insulation-soundproof layer, which is a single-layer or multi-layer honeycomb structure; Two layers of high temperature resistant-far infrared layers include metal oxide powder layers. The two layers of high temperature resistant-far infrared layers are arranged between the two layers of high temperature resistant-far infrared layers, and the sum of the thickness of the two layers of high temperature resistant-far infrared layers is 25-40% of the thickness of the composite braid.

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