Three-dimensional warm-keeping flocculus with far infrared temperature rise and windproof performance and preparation method of three-dimensional warm-keeping flocculus

Abstract

The invention discloses a three-dimensional warm-keeping flocculus with far infrared temperature rise and windproof performance and a preparation method of the three-dimensional warm-keeping flocculus. The three-dimensional warm-keeping flocculus comprises a first polyimide nanofiber layer, a far infrared temperature rise modified nylon fiber layer and a second polyimide nanofiber layer which are sequentially stacked from top to bottom, the far infrared temperature rise three-dimensional warm-keeping flocculus is prepared from a first polyamide acid nanofiber membrane, a far infrared temperature rise modified nylon fiber assembly and a second polyamide acid nanofiber membrane which are stacked in sequence. The far infrared temperature rise modified nylon fiber assembly is prepared from modified nylon fibers and polyamide acid nanofibers, and the modified nylon fibers are prepared from nylon slices, nano inorganic ceramic powder particles and inorganic nano SiO2 powder. The warm-keeping flocculus is good in structural stability, has far infrared temperature rise and windproof functions, is good in warm-keeping performance, is better in overall mechanical property, is simple to prepare, and is easy to realize large-scale production, and different components of the flocculus form crosslinking combination.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal insulation batting, in particular to a functional three-dimensional thermal insulation batting with far-infrared temperature rise and windproof performance and a preparation method thereof. BACKGROUND

[0002] Batting refers to a piece-shaped cotton-like material used for thermal insulation, heat insulation or shock absorption, which is a kind of loose filling material made of plant fibers, animal fibers or chemical fibers. With the increasing material and cultural needs of the public, the attention to functional batting in the field of textile thermal insulation materials is also increasing, and the market also prefers various functional thermal insulation batting products.

[0003] With the continuous progress of textile technology, there are more and more types of chemical fibers. Due to its high controllability and flexibility, it can produce fibers with specific functions, structures and forms, and has good physical and chemical stability. It gradually replaces natural thermal fibers in the field of thermal insulation batting, and has a broad market prospect. However, due to the larger diameter of the fiber raw material in the composition of the conventional chemical fiber batting, the pores between the fibers are larger, which can cause the static air in the batting to flow and form convection heat transfer when there is wind or when moving, resulting in heat loss and rapid decline in thermal performance. The overall structure and its practical performance are difficult to meet the actual thermal insulation needs, and the functionality is single. High-performance chemical fibers have excellent comprehensive performance, but the high cost of raw materials and complex processing process will directly affect the cost of the final formed batting product, limiting its large-scale application.

[0004] Nanometer diameter chemical fibers have small diameter, and the thermal insulation batting made therefrom is light in weight and has high porosity and small pore size. Compared with conventional diameter fibers, it can retain more static air and improve the thermal insulation effect, and has a broad application prospect in the field of thermal insulation batting. However, relevant documents show that there is only slight bonding between nanofiber battings, and the fluffy structure is only a simple accumulation, and the overall structural stability is poor, which cannot guarantee long-term use. At the same time, the poor mechanical properties of nanofibers result in poor resilience of the batting, which cannot withstand the stretching and extrusion of the thermal insulation material during use, and the structure is easily collapsed, resulting in a significant discount in thermal performance, which limits its popularization and use in the thermal insulation industry.

[0005] The far infrared performance of a textile refers to the ability of the textile to reflect, transmit and absorb energy in the far infrared band. It is generally believed that after a textile absorbs far infrared radiation, it will excite molecular vibration, produce a thermal effect, and thus play an additional heat preservation role. For a thermal insulation batt, having far infrared performance can improve the thermal insulation performance of the batt product. In order to realize the functionality of far infrared, the current main methods are: ① introducing a metal layer, for example, transferring the aluminum metal layer on an electrochemical aluminum thermal transfer film to the smooth surface of the batt by physical transfer printing to form a metallized surface of the batt, so as to reflect the far infrared thermal radiation of the human body itself and enhance the thermal insulation performance of the batt; the problem of this method is that the far infrared performance of the batt is given by introducing an additional metal layer, and the metal layer and the batt are fixed by adhesion, the combination is not firm enough, the batt itself does not have functional characteristics, and whether it has temperature rise performance is unknown. ② Introducing single-component additives, such as silicon-containing graphene materials and polyaniline nano far infrared materials. However, the above methods mainly realize the far infrared functionality of the batt through single-component additives, and the production of the above products cannot use ultra-fine fibers, but only conventional parameter fibers can be used for processing and production, and the reinforcement process is needle punching, water jetting or hot melting process. While realizing the above functionality, it cannot effectively guarantee the multi-functional characteristics such as thermal insulation performance and windproof performance of the batt, and the improvement of the thermal insulation performance of the batt is very limited, and the subsequent improvement space is also small.

[0006] Therefore, it is necessary to develop a preparation method of a functional batt which can be mass-produced industrially, has a cost advantage, has excellent structural stability, good resilience, good thermal insulation, good windproof, has far infrared temperature rise performance, and can meet the long-term use demand, so as to meet the long-term use demand of thermal insulation products and expand its use in the field of thermal insulation applications. SUMMARY

[0007] The present application aims to overcome the problems of the prior art such as poor thermal insulation and single functionality of conventional chemical fiber batts, poor structural stability of nano chemical fiber batts, and high production cost of high-performance fiber batts, to meet the actual long-term use demand of thermal insulation products, and to provide a three-dimensional thermal insulation batt with far infrared temperature rise and windproof performance and a preparation method thereof. The thermal insulation batt has good structural stability, far infrared temperature rise and windproof functionality, good thermal insulation performance, and a production cost advantage. The comprehensive thermal insulation performance of the thermal insulation batt can be improved by 30% to 110% compared with existing thermal insulation batt products. The different components of the batt form cross-linking bonds, and the overall mechanical properties are better. The preparation method is simple and easy to realize mass production.

[0008] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0009] In a first aspect, the present application provides a three-dimensional thermal insulation sheet with far-infrared temperature rise and windproof performance, which comprises a first polyimide nanofiber layer, a far-infrared temperature rise modified nylon fiber layer and a second polyimide nanofiber layer stacked in order from top to bottom.

[0010] The far-infrared temperature rise three-dimensional thermal insulation sheet is made of a first polyamide acid nanofiber membrane, a far-infrared temperature rise modified nylon fiber assembly and a second polyamide acid nanofiber membrane stacked in order.

[0011] The first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane are made of polyamide acid nanofiber membranes made of polyamide acid nanofiber.

[0012] The far-infrared temperature rise modified nylon fiber assembly is made of modified nylon fibers and polyamide acid nanofiber, the modified nylon fibers are made of modified nylon fiber spinning solution, and the modified nylon fiber spinning solution is made of nylon chips, nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder.

[0013] The first polyamide acid nanofiber membrane, the far-infrared temperature rise modified nylon fiber assembly and the second polyamide acid nanofiber membrane are made of polyamide acid nanofiber made of polyamide acid spinning solution.

[0014] In the above three-dimensional thermal insulation sheet with far-infrared temperature rise and windproof performance, the thickness of the first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane is 0.2-0.5mm, and the pore size is 0.5-2.5μm.

[0015] The thickness of the far-infrared temperature rise modified nylon fiber assembly is 2-45mm.

[0016] In the above three-dimensional thermal insulation sheet with far-infrared temperature rise and windproof performance, the weight ratio of the modified nylon fiber to the polyamide acid nanofiber is (80%-90%):(10%-20%) based on the total weight of the fiber for preparing the far-infrared temperature rise modified nylon fiber assembly being 100%.

[0017] The weight ratio of the polyamide acid nanofiber for preparing the first polyamide acid nanofiber membrane, the far-infrared temperature rise modified nylon fiber assembly and the second polyamide acid nanofiber membrane is (20%-35%):(30%-50%):(20%-35%) based on the total weight of the polyamide acid nanofiber being 100%.

[0018] In the three-dimensional thermal insulation flake with far infrared temperature rise and windproof performance, the modified nylon fiber spinning solution is made of the following raw materials in parts by weight, based on 100 parts of total weight: nylon chips 85-95 parts, nano inorganic ceramic powder particles 4-10 parts, and inorganic nano SiO2 powder 1-5 parts.

[0019] In the three-dimensional thermal insulation flake with far infrared temperature rise and windproof performance, the diameters of the polyamide acid nanofibers in the first polyamide acid nanofiber membrane, the far infrared temperature rise modified nylon fiber combination, and the second polyamide acid nanofiber membrane are 80-200 nm, and the lengths of the polyamide acid nanofibers are 30-70 mm.

[0020] The cross sections of the polyamide acid nanofibers in the first polyamide acid nanofiber membrane, the far infrared temperature rise modified nylon fiber combination, and the second polyamide acid nanofiber membrane are circular.

[0021] In the three-dimensional thermal insulation flake with far infrared temperature rise and windproof performance, the modified nylon fiber has a fineness of 0.5-5 dtex and a length of 30-55 mm.

[0022] The cross section of the modified nylon fiber is one or more of circular, polygonal, and irregular.

[0023] In the three-dimensional thermal insulation flake with far infrared temperature rise and windproof performance, the nylon chips are one of polycaprolactam chips, poly(hexamethylene adipate) chips, and poly(pentamethylene adipate) chips.

[0024] The nano inorganic ceramic powder particles are one or more of nano aluminum oxide, nano magnesium oxide, nano titanium dioxide, nano zirconium oxide, and nano zinc oxide.

[0025] In a second aspect, the present application provides a preparation method of the three-dimensional thermal insulation flake with far infrared temperature rise and windproof performance.

[0026] 1) Spinning the modified nylon fiber spinning solution into fibers, cutting to obtain the modified nylon fibers.

[0027] 2) Spinning the polyamide acid spinning solution into nanofibers, cutting to obtain the polyamide acid nanofibers.

[0028] 3) Mixing the modified nylon fibers and the polyamide acid nanofibers, and sequentially performing opening, carding, web laying, and drawing to obtain the far infrared temperature rise modified nylon fiber combination.

[0029] 4) Spinning the polyamide acid spinning solution into nanofibers and stacking into membranes to obtain the first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane, respectively.

[0030] 5) The first polyamide acid nanofiber membrane, the far infrared temperature rise modified nylon fiber assembly and the first polyamide acid nanofiber membrane are sequentially stacked into a sandwich combination structure, and then placed between two parallel fiber nets or metal nets placed on the left and right for hot air treatment, imidization, to obtain the far infrared temperature rise three-dimensional thermal insulation batt.

[0031] In the preparation method of the three-dimensional thermal insulation batt with far infrared temperature rise and windproof performance described above, in step 1), the fibers are spun by melt spinning method;

[0032] In steps 2) and 4), the nanofibers are spun by electrospinning method;

[0033] In step 5), the first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane in the sandwich combination structure are arranged in parallel with the two fiber nets or metal nets;

[0034] The hot air treatment is bidirectional air blowing, and the hot air is blown from the outside to the inside along the horizontal direction perpendicular to the first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane from both sides of the sandwich combination structure;

[0035] The distance between the two fiber nets or metal nets is 3-50 mm;

[0036] In the hot air treatment step, the initial hot air temperature is 130-160℃, the continuous action time is X s, then the temperature is raised at a rate of 2-5℃ / s to the peak temperature of 260-350℃, the time required for temperature rise is Y s, after reaching the peak temperature, the peak temperature is maintained for the continuous action time Z s, and then the room temperature is blown by hot air to reduce the temperature to room temperature, the total time X+Y+Z s of the hot air processing process is 120-300 s (2-5 min), and the hot air volume is 1000-2500 m 3 / h.

[0037] In a third aspect, the present application provides a thermal insulation product comprising the three-dimensional thermal insulation batt with far infrared temperature rise and windproof performance described in any one of the above or prepared by the preparation method described in any one of the above.

[0038] To solve the above related technical problems, the present application adopts the following technical scheme:

[0039] Compared with the prior art, the present application has the following advantages:

[0040] (1) The three-dimensional structure and windproof performance of the batt are obtained by high-temperature hot air processing, and each layer of the batt comprises polyamide acid fibers, and the polyamide acid fibers in the multiple layers of the batt are subjected to thermal imidization reaction by high-temperature hot air processing, the interaction between the fibers generates bonding points to enhance the elastic recovery of the batt, and the fibers are intertwined to enhance the bonding force between the layers of the batt, thereby forming a three-dimensional structure to improve the mechanical properties of the batt; the windproof performance is obtained by opening the whole batt in the high-temperature hot air process, increasing the structure porosity, and forming a uniform porous structure of the fiber web with high porosity on the outer layer of the batt.

[0041] (2) The traditional chemical fiber warm-keeping batt has a simple structure and a large internal porosity, and the heat convection leads to a decrease in the warm-keeping performance; the warm-keeping batt comprises a specific multi-layer fiber layer structure, a polyamide acid nanofiber membrane layer, a far-infrared temperature-rising modified nylon fiber layer, and a polyamide acid nanofiber membrane layer, the outer polyimide nanofiber layer improves the windproof performance of the batt, reduces the loss of heat caused by the heat convection of the static air in the pores between the coarse fibers in the inner layer of the batt, and improves the warm-keeping performance of the batt as a whole; the modified nylon fiber layer as the intermediate layer is composed of fiber raw materials with a large diameter to enhance the mechanical structure of the batt as a whole, improve the elastic recovery of the batt, and improve the mechanical structure of the batt as a whole to enhance the performance stability of the batt in use.

[0042] (3) The far-infrared temperature-rising modified nylon fiber layer as the main functional layer of the batt (70-80% of the total weight) improves the far-infrared temperature-rising effect of the batt as a whole, the nano-SiO2 powder and the nano-inorganic ceramic powder particles are added to the modified nylon fiber, the absorption and heating capacity of the nano-SiO2 powder to ultraviolet light and near-infrared light and the far-infrared performance of the nano-inorganic ceramic powder particles can produce a synergistic effect, and the nylon fiber itself does not have the far-infrared temperature-rising performance, and the warm-keeping performance and the far-infrared temperature-rising performance of the batt are improved as a whole, and the warm-keeping performance of the batt as a whole is improved; in addition, the addition of the nano-SiO2 powder also enhances the high-temperature resistance of the nylon fiber, and generates a mesoporous structure in the nylon fiber to improve the heat insulation and warm-keeping performance of the batt as a whole; the modified material is directly blended and added in the fiber spinning process, without the need for additional processing steps.

[0043] (4) The batt is subjected to high-temperature hot air processing by the vertical method, and the air is blown from both sides of the batt and acts on the batt, which can effectively ensure that the polyamide acid fibers on both sides of the batt are subjected to sufficient imidization reaction, and the bulkiness of the warm-keeping batt as a whole is effectively ensured, thereby effectively avoiding the problem of insufficient warm-keeping performance caused by the insufficient uniformity and bulkiness of the lower layer of the batt due to the compression of the lower layer of the batt caused by the weight of the batt in the horizontal processing mode.

[0044] (5) The warm-keeping batt according to the present application can obtain warm-keeping batts with different thicknesses by controlling the distance between the two high-temperature-resistant fiber nets according to actual needs, and the thickness control range is 3-50 mm, which can meet the actual warm-keeping needs under various scene conditions.

[0045] (6) The modified nylon fiber accounts for 70-80% in the main component of the warm-keeping batt according to the present application, compared with the warm-keeping batts using high-performance fibers as raw materials, the warm-keeping performance is improved, the production cost is greatly reduced, and the functionality is increased; compared with the traditional chemical fiber warm-keeping batt, the warm-keeping performance of the warm-keeping batt according to the present application is greatly improved, which exceeds the existing batt related patent products, and the functionality is increased, and the overall performance is greatly improved.

[0046] (7) The outer layer of the warm-keeping batt according to the present application is a pure polyimide fiber layer after hot air processing, and the polyimide fibers in the inner layer are uniformly distributed in the batt, and the addition of polyimide fibers gives the batt certain flame-retardant and antibacterial functional properties.

[0047] (8) The preparation method according to the present application is simple, the overall mechanical properties of the product are good, the warm-keeping performance is good, the cost is low, and large-scale industrial production can be easily realized. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 It is a structure schematic diagram of the three-dimensional warm-keeping batt with far-infrared temperature rise and windproof performance according to an embodiment of the present application.

[0049] Figure 2 It is a hot air processing process schematic diagram of the batt product according to the present application.

[0050] The reference signs are as follows:

[0051] 1-First polyimide nanofiber layer; 2-Far-infrared temperature rise modified nylon fiber layer; 3-Second polyimide nanofiber layer; 4-Left hot air; 5-Right hot air; 6-First fiber net or metal net; 7-Second fiber net or metal net. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the use of the terms "first", "second", and the like to define parts is only for the convenience of distinguishing the above-mentioned parts, and the above-mentioned terms have no special meaning unless otherwise stated, and cannot be understood as indicating or implying relative importance.

[0054] As described in the background, the existing far-infrared functional flake mainly realizes by introducing metal layer or single-component additive in the flake, which has the problems of unknown temperature rise performance or cannot simultaneously consider the overall performance such as warmth performance, windproof performance and mechanical performance. For example, Figure 1The application provides a far-infrared temperature-rising three-dimensional thermal insulation fluff sheet, which comprises a first polyimide nanofiber layer 1, a far-infrared temperature-rising modified nylon fiber layer 2 and a second polyimide nanofiber layer 3 which are stacked in sequence from top to bottom. The far-infrared temperature-rising three-dimensional thermal insulation fluff sheet is made of a first polyamide acid nanofiber film, a far-infrared temperature-rising modified nylon fiber assembly and a second polyamide acid nanofiber film which are stacked in sequence. In the first polyamide acid nanofiber film and the second polyamide acid nanofiber film, the polyamide acid nanofiber film is made of polyamide acid nanofiber. The far-infrared temperature-rising modified nylon fiber assembly is made of modified nylon fiber and polyamide acid nanofiber. The modified nylon fiber is made of modified nylon fiber spinning solution. The modified nylon fiber spinning solution is made of nylon chips, nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder. In the first polyamide acid nanofiber film, the far-infrared temperature-rising modified nylon fiber assembly and the second polyamide acid nanofiber film, the polyamide acid nanofiber is made of polyamide acid spinning solution. Based on the above technical scheme, the application adopts a sandwich structure. The upper and lower layers are polyimide nanofiber layers. The middle layer is a far-infrared temperature-rising modified nylon fiber layer. The whole is made of a first polyamide acid nanofiber film, a far-infrared temperature-rising modified nylon fiber assembly and a second polyamide acid nanofiber film which are stacked in sequence (processed by high-temperature hot air). The far-infrared temperature-rising modified nylon fiber assembly is made of modified nylon fiber and polyamide acid nanofiber. The modified nylon fiber is made of modified nylon fiber spinning solution. The modified nylon fiber spinning solution is made of nylon chips, nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder. On the one hand, the introduction of nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder in the modified nylon fiber can endow the far-infrared temperature-rising performance. On the other hand, the first polyimide nanofiber layer and the second polyimide nanofiber layer can endow the fluff sheet with good windproof performance and improve the overall thermal insulation performance of the fluff sheet. After hot air processing, part of the polyamide acid fiber mixed in the modified nylon fiber layer will form a certain binding force with the first and second polyamide acid fiber layers, endowing the fluff sheet with a good three-dimensional structure and structural stability. Therefore, the thermal insulation fluff sheet of the application has far-infrared temperature-rising performance, windproof performance and mechanical properties.

[0055] According to the application, the thickness of the first polyamide acid nanofiber film and the second polyamide acid nanofiber film is 0.2-0.5 mm, and the pore size is 0.5-2.5 μm. The thickness of the first polyamide acid nanofiber film and the second polyamide acid nanofiber film can be the same or different, including but not limited to 0.5 mm, 0.4 mm or 0.45 mm. The thickness can be reasonably adjusted according to the requirements of the windproof performance of the fluff sheet. The areal density of the first polyamide acid nanofiber film and the second polyamide acid nanofiber film can be adjusted as required, such as 5-13 g / m2.2 including but not limited to 10 g / m 2 , 8 g / m 2 or 9 g / m 2 . Similarly, the thickness of the far-infrared temperature-rising modified nylon fiber assembly is 2-45 mm, which can be reasonably adjusted according to the requirement for the warmth retention performance of the batting, including but not limited to 25 mm, 27 mm or 26 mm; wherein the areal density of the far-infrared temperature-rising modified nylon fiber assembly can be adjusted as required, such as 40-300 g / m 2 , including but not limited to 100 g / m 2 , 104 g / m 2 or 102 g / m 2 .

[0056] According to the present application, the weight ratio of the modified nylon fiber to the polyamide acid nanofiber is (80%-90%):(10%-20%) based on 100% of the total weight of the fiber for preparing the far-infrared temperature-rising modified nylon fiber assembly, including but not limited to 90%:10%, 86.5%:13.5% or 88%:12%.

[0057] The weight ratio of the polyamide acid nanofiber for preparing the first polyamide acid nanofiber film, the far-infrared temperature-rising modified nylon fiber assembly and the second polyamide acid nanofiber film is (20%-35%):(30%-50%):(20%-35%) based on 100% of the total weight of the polyamide acid nanofiber, including but not limited to 33.3%:33.4%:33.3%, 26.7%:46.6%:26.7% or 30%:40%:30%.

[0058] According to the present application, the polyamide acid nanofiber used in the first polyamide acid nanofiber film, the far-infrared temperature-rising modified nylon fiber assembly and the second polyamide acid nanofiber film is made of a polyamide acid spinning solution.

[0059] According to the present application, the modified nylon fiber spinning solution is made of the following raw materials in the weight parts: nylon chip 85-95 parts, nano-inorganic ceramic powder particles 4-10 parts and inorganic nano-SiO2 powder 1-5 parts based on 100 parts of the total weight. The modified nylon fiber spinning solution can be specifically any one of the following: 1) made of the following raw materials in the weight parts: nylon chip 85 parts, nano-inorganic ceramic powder particles 10 parts and inorganic nano-SiO2 powder 5 parts based on 100 parts of the total weight; 2) made of the following raw materials in the weight parts: nylon chip 90 parts, nano-inorganic ceramic powder particles 7 parts and inorganic nano-SiO2 powder 3 parts based on 100 parts of the total weight. The nylon chip can be specifically nylon 66 chip.

[0060] According to the application, the diameters of the polyamide acid nanofibers in the first polyamide acid nanofiber membrane, the far-infrared temperature-rising modified nylon fiber combination and the second polyamide acid nanofiber membrane are 80-200 nm, and the lengths are 30-70 mm (e.g., 38 mm, 51 mm or 60 mm). Too short fiber length will result in a larger porosity of the outer layer of the batt, reducing the windproof performance. Too long or too short fiber length will result in a reduced number of crosslinking points between batt layers, reducing the bonding force between the batt layers and increasing the difficulty of processing the batt.

[0061] The cross sections of the polyamide acid nanofibers in the first polyamide acid nanofiber membrane, the far-infrared temperature-rising modified nylon fiber combination and the second polyamide acid nanofiber membrane are circular.

[0062] According to the application, the modified nylon fibers have a fiber fineness of 0.5-5 dtex (e.g., 5 dtex) and a length of 30-55 mm (e.g., 35 mm, 38 mm). Too fine fiber fineness will result in poor resilience of the batt product, and too coarse fiber fineness will result in poor compressibility of the batt product. Too fine or too coarse fiber diameter will reduce the warmth retention performance and wearability of the batt product. Too short fiber length will result in insufficient bonding force between the batt layers, making the batt difficult to process, and too long fiber length will be unfavorable to the opening of the batt, reducing the overall warmth retention performance.

[0063] The cross sections of the modified nylon fibers are one or more of circular, polygonal and irregular.

[0064] According to the application, the nylon chips are one of polyhexanamide chips, poly(hexamethylene adipamide) chips and poly(pentamethylene adipamide) chips.

[0065] The nano-inorganic ceramic powder particles are one of nano-alumina, nano-magnesia, nano-titania, nano-zirconia and nano-zinc oxide.

[0066] The second part of the present invention provides a method for preparing the three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof performance as described in any one of the above claims, comprising the following steps: 1) spinning the modified nylon fiber spinning solution into fibers, cutting them to obtain the modified nylon fibers; 2) spinning the polyamic acid spinning solution into nanofibers, cutting them to obtain the polyamic acid nanofibers; 3) mixing the modified nylon fibers and the polyamic acid nanofibers, and sequentially performing opening, carding, web laying, and drawing processes to obtain the far-infrared temperature rise modified nylon fiber assembly; 4) spinning the polyamic acid spinning solution into nanofibers and stacking them into a film to obtain the first polyamic acid nanofiber film and the second polyamic acid nanofiber film; 5) sequentially stacking the first polyamic acid nanofiber film, the far-infrared temperature rise modified nylon fiber assembly, and the first polyamic acid nanofiber film into a sandwich structure, and then placing it between two fiber webs or metal webs placed on the left and right for hot air treatment, followed by imidization to obtain the far-infrared temperature rise three-dimensional thermal insulation wadding.

[0067] According to the present invention, in step 1), the fiber is spun by melt spinning, which uses a molten modified nylon fiber spinning solution to extrude it into filaments, and then cools and solidifies it in air.

[0068] According to the present invention, in steps 2) and 4), the nanofibers are spun using electrospinning. Electrospinning utilizes the flow and deformation of a statically charged polymer solution in an electrostatic field, followed by solvent evaporation and solidification to form a fibrous material. In the present invention, the solvent and concentration in the electrospinning solution can be adjusted according to the type of monomer, and parameters such as the electric field strength can be adjusted according to the required fiber fineness. While ensuring the fiber fineness, the composition of the electrospinning solution and the spinning process conditions do not affect the performance of the final formed flocs.

[0069] like Figure 2 As shown, in the sandwich composite structure, the first polyamic acid nanofiber membrane 1 and the second polyamic acid nanofiber membrane 3 are arranged in parallel with the first fiber mesh or metal mesh 6 and the second fiber mesh or metal mesh 7.

[0070] The hot air treatment is bidirectional blowing. Hot air is blown from the outside to the inside of the sandwich assembly structure from both sides, perpendicular to the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane, in a horizontal direction. That is, the sandwich assembly structure is placed vertically, and the left hot air 4 and the right hot air 5 blow from the left and right sides, perpendicular to the first polyamic acid nanofiber membrane 1 and the second polyamic acid nanofiber membrane 3, from the outside to the inside.

[0071] According to the application, hot air is blown from both sides of two vertically placed high-temperature-resistant fiber nets and acts on the combined structure layer, on the one hand, to make the whole flake open, increase the structure bulkiness, and make the inner and outer flake layers have a uniform porous structure with high porosity, reduce heat convection, and enhance the windproof performance of the whole flake; on the other hand, to make the polyamide acid nanofiber contained therein have a thermal pressure imidization reaction, make the interaction bonding points between fibers be the support points for the elastic rebound of the flake, and make the fibers interwind to enhance the bonding force between flake layers, form a three-dimensional structure to enhance the mutual bonding force between the combined structure layers, and give the flake excellent mechanical properties and compression rebound performance; in addition, the bilateral blowing ensures the sufficient opening and imidization of the polyamide acid fibers on both sides; otherwise, when the hot air is blown in a horizontal direction, the lower layer of the flake will be compressed due to its own weight, and the upper layer of the flake cannot be sufficiently opened and imidized due to insufficient hot air processing temperature; therefore, under the thickness and weight of the flake in the application, the vertical high-temperature hot air processing can effectively avoid the problem of insufficient warmth due to insufficient uniformity and bulkiness of the flake caused by the compression of the lower layer of the flake due to the weight of the flake in the horizontal processing mode.

[0072] The distance between the two fiber nets or metal nets is 3-50 mm (such as 30 mm), which can be manually adjusted according to needs; wherein the mesh size can be 3-10 cm; the fiber net can be a carbon fiber net.

[0073] In the hot air treatment step, the initial hot air temperature is 130-160℃, the continuous action time X s, then the temperature is raised at a rate of 2-5℃ / s to the peak temperature 260-350℃, the time required for temperature rise is Y s, after reaching the peak temperature, the peak temperature is maintained for the continuous action time Z s, and then the temperature is lowered to room temperature by blowing hot air at room temperature, the total time of the hot air processing process X+Y+Z s is 120-300 s (2-5 min), and the hot air flow is 1000-2500 m 3 / h. As an example, the initial hot air temperature is 150℃, the continuous action time is 65 s, then the temperature is raised at a rate of 2℃ / s to the peak temperature 300℃, and the continuous action time is 40 s, then the temperature is lowered to room temperature by blowing hot air at room temperature, the total time of the hot air processing process is 3 min, and the hot air flow is 2000 m 3 / h. Among them, "room temperature" is different from the temperature in the hot air treatment, that is, the general temperature or room temperature, preferably 10-30℃, more preferably 15-25℃.

[0074] The application will be further described in conjunction with the specific embodiments. The examples given are only to illustrate the application, and are not intended to limit the scope of the application. The examples provided below can serve as a guide for further improvement by those of ordinary skill in the art, and do not in any way constitute a limitation on the application.

[0075] The methods used in the following examples are conventional methods, and are performed according to the techniques or conditions described in the literature in the art or according to the product instructions, unless otherwise specified. The materials, reagents, etc. used in the following examples can be obtained commercially, unless otherwise specified.

[0076] The nano-inorganic ceramic powder particles used in the following examples are all nano-zinc oxide, with a particle size of 20-40 nm and a purity of greater than 99%.

[0077] The inorganic nano-SiO2 powder has a particle size of 30±5 nm and a purity of greater than 99.5%.

[0078] The polyamide acid spinning solution used in the following examples is purchased from Hubei Comdi Chemical Co., Ltd., with the brand Comdi, the product name polyamide acid, and the article number 99904-22-0.

[0079] The performance test method of the far-infrared temperature rise three-dimensional thermal insulation batt in the following examples is as follows:

[0080] Batt area density: GB / T 24218.1-2009 Textiles - Test methods for nonwovens - Part 1: determination of mass per unit area

[0081] Batt thickness: GB / T 3820-1997 Determination of thickness of textiles and textile products

[0082] Batt overall air permeability: GB / T 5453-1997 Determination of air permeability of textile fabrics (pressure drop 100 Pa)

[0083] Batt compression rate: FZ / T 64003-2021 Spun-bonded cotton batt

[0084] Batt recovery rate: FZ / T 64003-2021 Spun-bonded cotton batt

[0085] Batt CLO value: GB / T 11048-2018 Textiles - Determination of physiological comfort - Measurement of thermal and vapour resistance under steady-state conditions (evaporative hot plate method)

[0086] Batt far-infrared emissivity: GB / T 30127-2013 Textiles - Determination and evaluation of far-infrared properties

[0087] Batt temperature rise: GB / T 30127-2013 Textiles - Determination and evaluation of far-infrared properties

[0088] The high-temperature resistant fiber mesh in the following embodiments is made of carbon fiber mesh with a mesh size of 3-10cm. High-temperature resistant metal mesh can also be used.

[0089] Example 1

[0090] I. Far-infrared temperature-raising three-dimensional heat-insulating wadding

[0091] like Figure 1 As shown, the far-infrared temperature-raising three-dimensional thermal insulation wadding provided in this embodiment includes a first polyimide nanofiber layer 1, a far-infrared temperature-raising modified nylon fiber layer 2, and a second polyimide nanofiber layer 3, which are stacked sequentially from top to bottom.

[0092] The far-infrared temperature-raising three-dimensional heat-insulating wadding is made of a first polyamic acid nanofiber membrane, a far-infrared temperature-raising modified nylon fiber assembly, and a second polyamic acid nanofiber membrane stacked sequentially. Specifically, it is a three-dimensional functional wadding formed by processing a sandwich structure of a certain thickness, consisting of a first polyamic acid nanofiber membrane, a far-infrared temperature-raising modified nylon fiber assembly, and a second polyamic acid nanofiber membrane stacked sequentially, using high-temperature hot air.

[0093] The areal density of the first and second polyamic acid nanofiber membranes is 10 g / m³. 2 The thickness is 0.5 mm and the pore size is 0.5–2.5 μm; in the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane, the polyamic acid nanofiber membrane is made of polyamic acid nanofibers; specifically, the polyamic acid nanofiber membrane is formed by stacking nanofibers spun from polyamic acid spinning solution by electrospinning; the polyamic acid nanofibers are made from polyamic acid spinning solution;

[0094] The areal density of the far-infrared temperature-modified nylon fiber composite is 100 g / m³. 2 The thickness is 25mm; the far-infrared temperature rise modified nylon fiber assembly is made of modified nylon fiber and polyamic acid nanofiber. The polyamic acid nanofiber is made of polyamic acid spinning solution, with a circular cross-section, a diameter of 80-200nm, and a length of 60mm; the modified nylon fiber is made of modified nylon fiber spinning solution, with a circular cross-section, a fiber fineness of 5dtex, and a length of 38mm; the modified nylon fiber spinning solution is made of nylon chips 66, nano-inorganic ceramic powder particles, and inorganic nano-SiO2 powder; specifically, the far-infrared temperature rise modified nylon fiber layer is a fiber assembly made by uniformly mixing far-infrared temperature rise modified nylon fiber and polyamic acid nanofiber, followed by opening, carding, web laying, and drawing.

[0095] The weight ratio of the modified nylon fiber and the polyamide acid nanofiber is 90%:10% based on the total weight of the fibers of the far infrared temperature-rising modified nylon fiber assembly being 100%;

[0096] The weight ratio of the polyamide acid nanofibers for preparing the first polyamide acid nanofiber membrane, preparing the far infrared temperature-rising modified nylon fiber assembly and preparing the second polyamide acid nanofiber membrane is 33.3%:33.4%:33.3% based on the total weight of the polyamide acid nanofibers being 100%;

[0097] The modified nylon fiber spinning solution is made of the following raw materials by weight: 85 parts of nylon 66 chips, 10 parts of nano inorganic ceramic powder particles and 5 parts of inorganic nano SiO2 powder based on the total weight being 100 parts.

[0098] II. Preparation method

[0099] The preparation method of the far infrared temperature-rising three-dimensional thermal insulation batt provided by the embodiment comprises the following steps:

[0100] Step 1: preparing the modified nylon fiber: using the melt spinning method to spin the blended modified nylon fiber spinning solution into the far infrared temperature-rising modified nylon fiber filament with a fineness of 5 dtex, and cutting the filament to a length of 38 mm;

[0101] Step 2: preparing the polyamide acid nanofiber: using the electrospinning method to spin the polyamide acid spinning solution into the nanofiber, and cutting the nanofiber to a length of 60 mm;

[0102] Step 3: preparing the far infrared temperature-rising modified nylon fiber layer: uniformly mixing 90 parts of the far infrared temperature-rising modified nylon fiber and 10 parts of the cut polyamide acid nanofiber, and then performing the opening-carding-laying-drawing processing to form the fiber assembly with a certain thickness, in which the fiber assembly has a surface density of 100 g / m 2 and a thickness of 25 mm;

[0103] Step 4: preparing the polyamide acid nanofiber membrane: using the electrospinning method to spin the polyamide acid spinning solution into the nanofiber and stack the nanofiber into the polyamide acid nanofiber membrane with a certain thickness, in which the polyamide acid nanofiber membrane has a surface density of 10 g / m 2 , a thickness of 0.5 mm and a pore size of 0.5-2.5 μm;

[0104] Step 5: preparing the sandwich structure combined layer: stacking the polyamide acid nanofiber membrane, the far infrared temperature-rising modified nylon fiber assembly and the polyamide acid nanofiber membrane in sequence to form the combined layer with the sandwich structure, and vertically placing the combined layer between two parallel high-temperature-resistant fiber nets, in which the distance between the two parallel high-temperature-resistant fiber nets is 30 mm;

[0105] Step 6: high-temperature hot air processing to obtain a flake: hot air is blown from both sides of two vertically placed high-temperature resistant fiber nets and acts on the above-mentioned combined structure layer (see Figure 2 ), on the one hand, the whole flake is opened, the structure bulkiness is increased, and the inner and outer layers of the flake produce a uniform porous structure with high porosity, reducing heat convection and enhancing the windproof performance of the whole flake; on the other hand, the polyamide acid nanofibers contained therein undergo thermal imidization reaction, the interaction between the fibers produces bonding points to enhance the elastic rebound support points of the flake, and the mutual entanglement between the fibers enhances the interlayer bonding force of the flake, forming a three-dimensional structure to enhance the mutual bonding force between the combined structure layers, and the flake has excellent mechanical properties and compression rebound properties;

[0106] In this embodiment, the initial hot air temperature in the high-temperature hot air processing process is 150°C, the continuous action time is 65s, then the temperature is increased to a peak temperature of 300°C at a temperature increase rate of 2°C / s, and the continuous action time is 40s, then the temperature is decreased to room temperature by constant temperature blowing, the total time of the hot air processing process is 3min, and the hot air flow is 2000m 3 / h;

[0107] Step 7: cutting and packaging: cutting the edges of the flake after high-temperature hot air processing, ultraviolet sterilization, rolling and packaging.

[0108] III. Performance

[0109] The three-dimensional warm-keeping flake with far-infrared temperature rise and windproof performance prepared according to the process steps of this embodiment has a face density of 115±5g / m 2 , a thickness of 30mm, an overall flake air permeability of less than 8mm / s, an excellent windproof effect, a CLO value of 5.62 (GB / T 11048-2018), very excellent warm-keeping performance, and far-infrared temperature rise function, wherein the far-infrared emissivity is 0.84, the temperature rise is 3.2°C (GB / T 30127-2013), the flake compression rate is greater than 60%, the recovery rate is greater than 95%, and the flake has certain flame retardant and antibacterial functional properties.

[0110] Example 2

[0111] I. Far-infrared temperature rise three-dimensional warm-keeping flake

[0112] As shown in Figure 1 , the far-infrared temperature rise three-dimensional warm-keeping flake provided by the embodiment includes a first polyimide nanofiber layer 1, a far-infrared temperature rise modified nylon fiber layer 2 and a second polyimide nanofiber layer 3 stacked in order from top to bottom;

[0113] The far-infrared temperature-rising three-dimensional thermal insulation flake is made of a first polyamide acid nanofiber membrane, a far-infrared temperature-rising modified nylon fiber combination and a second polyamide acid nanofiber membrane which are stacked in sequence; specifically, it is a three-dimensional structure functional flake made of a sandwich combination structure with a certain thickness formed by the first polyamide acid nanofiber membrane, the far-infrared temperature-rising modified nylon fiber combination and the second polyamide acid nanofiber membrane which are stacked in sequence and processed by high-temperature hot air.

[0114] The areal density of the first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane is 8 g / m 2 , the thickness is 0.4 mm, and the pore size is 0.5-2.5 μm; in the first polyamide acid nanofiber membrane and the second polyamide acid nanofiber membrane, the polyamide acid nanofiber membrane is made of polyamide acid nanofiber; specifically, the polyamide acid nanofiber membrane is stacked by nanofiber spun by electrospinning of polyamide acid spinning solution; the polyamide acid nanofiber is made of polyamide acid spinning solution.

[0115] The areal density of the far-infrared temperature-rising modified nylon fiber combination is 104 g / m 2 , and the thickness is 27 mm; the far-infrared temperature-rising modified nylon fiber combination is made of modified nylon fiber and polyamide acid nanofiber, the polyamide acid nanofiber is made of polyamide acid spinning solution, the cross-sectional shape is circular, the diameter is 80-200 nm, and the length is 60 mm; the modified nylon fiber is made of modified nylon fiber spinning solution, the cross-sectional shape is cross-section, the fiber fineness is 5 dtex, and the length is 38 mm; the modified nylon fiber spinning solution is made of nylon chip 66, nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder; specifically, the far-infrared temperature-rising modified nylon fiber layer is a fiber combination processed by opening, carding, laying and drawing after uniform mixing of the far-infrared temperature-rising modified nylon fiber and the polyamide acid nanofiber.

[0116] The weight ratio of the modified nylon fiber to the polyamide acid nanofiber is 86.5%:13.5% based on the total weight of the fiber of the far-infrared temperature-rising modified nylon fiber combination being 100%;

[0117] The weight ratio of the polyamide acid nanofiber for preparing the first polyamide acid nanofiber membrane, the far-infrared temperature-rising modified nylon fiber combination and the second polyamide acid nanofiber membrane is 26.7%:46.6%:26.7% based on the total weight of the polyamide acid nanofiber being 100%;

[0118] The modified nylon fiber spinning solution is made of 90 parts by weight of nylon 66 chip, 7 parts by weight of nano-inorganic ceramic powder particles and 3 parts by weight of inorganic nano-SiO2 powder based on the total weight being 100 parts.

[0119] II. Preparation method

[0120] The preparation method of the far-infrared temperature rise three-dimensional thermal insulation batt provided by the embodiment comprises the following steps:

[0121] Step 1: preparing modified nylon fibers: using melt spinning method to spin the blended modified nylon fiber spinning solution into far-infrared temperature rise modified nylon fiber filaments with a fiber fineness of 5 dtex, and cutting them to a length of 38 mm;

[0122] Step 2: preparing polyamide acid nanofibers: using electrospinning method to spin the polyamide acid spinning solution into nanofibers, and cutting them to a length of 60 mm;

[0123] Step 3: preparing far-infrared temperature rise modified nylon fiber layer: uniformly mixing 86.5 parts of far-infrared temperature rise modified nylon fibers and 13.5 parts of cut polyamide acid nanofibers, and then performing opening-carding-webbing-drawing processing to form a fiber combination body with a certain thickness, in this embodiment, the fiber combination body has a surface density of 104 g / m 2 and a thickness of 27 mm;

[0124] Step 4: preparing polyamide acid nanofiber membrane: using electrospinning method to spin the polyamide acid spinning solution into nanofibers and stack them into a polyamide acid nanofiber membrane with a certain thickness, in this embodiment, the polyamide acid nanofiber membrane has a surface density of 8 g / m 2 , a thickness of 0.4 mm, and a pore size of 0.5-2.5 μm;

[0125] Step 5: preparing sandwich structure combination layer: stacking the polyamide acid nanofiber membrane, the far-infrared temperature rise modified nylon fiber combination body, and the polyamide acid nanofiber membrane layer in sequence to form a sandwich structure combination layer, and vertically placing the sandwich structure combination layer between two parallel high-temperature resistant fiber nets, the distance between the two parallel high-temperature resistant fiber nets is 30 mm;

[0126] Step 6: processing the batt by high-temperature hot air: blowing hot air from both sides of the two vertically placed high-temperature resistant fiber nets and acting on the above combination structure layer, on the one hand, the batt as a whole is opened, the structure bulkiness is increased, and the inner and outer layers of the batt produce a uniform porous structure with high porosity, reducing heat convection and enhancing the windproof performance of the batt as a whole; on the other hand, the polyamide acid nanofibers contained therein undergo thermal pressure amine reaction, the interaction between the fibers produces bonding points for the support points of the elastic rebound of the batt, and the fibers are intertwined to enhance the bonding force between the batt layers, forming a three-dimensional structure that enhances the mutual bonding force between the combination structure layers, and endowing the batt with excellent mechanical properties and compression rebound performance;

[0127] In the present embodiment, the initial hot air temperature of the high-temperature hot air processing process is 150°C, the duration is 65s, then the temperature is raised to the peak temperature of 300°C at the temperature raising rate of 2°C / s, and the duration is 40s, and then the temperature is lowered to room temperature by constant temperature blowing, the total time of the hot air processing process is 3min, and the hot air volume is 2000m 3 / h;

[0128] Step 7: cutting and packaging: cutting the high-temperature hot air processed batt, ultraviolet sterilization, rolling and packaging.

[0129] III. Performance

[0130] The three-dimensional thermal insulation batt with far-infrared temperature rise and windproof performance prepared according to the process steps of the present embodiment has a surface density of 115±5g / m2, a thickness of 30mm, an overall air permeability of the batt of less than 20mm / s, a good windproof effect, a CLO value of 5.15 (GB / T 11048-2018), excellent thermal insulation performance, and far-infrared temperature rise function, wherein the far-infrared emissivity is 0.83, the temperature rise is 2.6°C (GB / T 30127-2013), the batt compression rate is greater than 50%, the recovery rate is greater than 90%, and the batt as a whole has certain flame retardant and antibacterial functional properties.

[0131] Example 3

[0132] I. Far-infrared temperature rise three-dimensional thermal insulation batt

[0133] As shown in Figure 1 , the far-infrared temperature rise three-dimensional thermal insulation batt provided by the present embodiment comprises a first polyimide nanofiber layer 1, a far-infrared temperature rise modified nylon fiber layer 2 and a second polyimide nanofiber layer 3 stacked in order from top to bottom;

[0134] The far-infrared temperature rise three-dimensional thermal insulation batt is made of a first polyamic acid nanofiber membrane, a far-infrared temperature rise modified nylon fiber combination and a second polyamic acid nanofiber membrane stacked in order; specifically, it is a three-dimensional structure functional batt formed by high-temperature hot air processing of a sandwich combination structure with a certain thickness formed by a first polyamic acid nanofiber membrane, a far-infrared temperature rise modified nylon fiber combination and a second polyamic acid nanofiber membrane stacked in order;

[0135] The surface density of the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane is 9g / m 2, thickness 0.45mm, pore size 0.5-2.5μm; in the first and second polyamic acid nanofiber membranes, the polyamic acid nanofiber membrane is made of polyamic acid nanofiber; specifically, the polyamic acid nanofiber membrane is stacked by nanofiber spun by electrospinning method from polyamic acid spinning solution; the polyamic acid nanofiber is made of polyamic acid spinning solution;

[0136] The areal density of the far infrared temperature-increasing modified nylon fiber assembly is 102g / m 2 , thickness 26mm; the far infrared temperature-increasing modified nylon fiber assembly is made of modified nylon fiber and polyamic acid nanofiber, the polyamic acid nanofiber is made of polyamic acid spinning solution, the cross-sectional shape is circular, the diameter is 80-200nm, and the length is 60mm; the modified nylon fiber is made of modified nylon fiber spinning solution, the cross-sectional shape is circular, the fiber fineness is 5dtex, and the length is 38mm; the modified nylon fiber spinning solution is made of nylon chip 66, nano-inorganic ceramic powder particles, and inorganic nano-SiO2 powder; specifically, the far infrared temperature-increasing modified nylon fiber layer is a fiber assembly processed by opening, carding, laying, and drawing after uniform mixing of the far infrared temperature-increasing modified nylon fiber and the polyamic acid nanofiber;

[0137] The weight ratio of the modified nylon fiber to the polyamic acid nanofiber is 88%:12% based on the total weight of the fibers of the far infrared temperature-increasing modified nylon fiber assembly being 100%;

[0138] The weight ratio of the polyamic acid nanofiber for preparing the first polyamic acid nanofiber membrane, the far infrared temperature-increasing modified nylon fiber assembly, and the second polyamic acid nanofiber membrane is 30%:40%:30% based on the total weight of the polyamic acid nanofiber being 100%;

[0139] The modified nylon fiber spinning solution is made of the following raw materials by weight: nylon 66 chip 90 parts, nano-inorganic ceramic powder particles 7 parts, and inorganic nano-SiO2 powder 3 parts based on the total weight being 100 parts.

[0140] II. Preparation method

[0141] The preparation method of the far infrared temperature-increasing three-dimensional warm-keeping batt provided in this embodiment includes the following steps:

[0142] Step 1: preparing modified nylon fiber: using melt spinning method to spin the blended modified nylon fiber spinning solution into far infrared temperature-increasing modified nylon fiber filament with fiber fineness of 5dtex, and cutting it to a length of 38mm;

[0143] Step 2: preparing polyamic acid nanofiber: using electrospinning method to spin the polyamic acid spinning solution into nanofiber, and cutting it to a length of 60mm;

[0144] Step 3: Preparation of far infrared temperature-rising modified nylon fiber layer: the far infrared temperature-rising modified nylon fiber 88 parts and the cut polyamide acid nanofiber 12 parts are uniformly mixed and then subjected to opening-carding-laying-drawing processing to form a fiber combination with a certain thickness. In this embodiment, the fiber combination has a surface density of 102 g / m 2 and a thickness of 26 mm;

[0145] Step 4: Preparation of polyamide acid nanofiber membrane: the polyamide acid spinning solution is spun into nanofibers by electrospinning and stacked into a polyamide acid nanofiber membrane with a certain thickness. In this embodiment, the polyamide acid nanofiber membrane has a surface density of 9 g / m 2 , a thickness of 0.45 mm, and a pore size of 0.5-2.5 μm;

[0146] Step 5: Preparation of sandwich structure combination layer: the polyamide acid nanofiber membrane, the far infrared temperature-rising modified nylon fiber combination, and the polyamide acid nanofiber membrane are sequentially stacked to form a sandwich structure combination layer, which is vertically placed between two parallel high-temperature-resistant fiber nets with a distance of 30 mm between the parallel high-temperature-resistant fiber nets;

[0147] Step 6: High-temperature hot air processing to obtain the batting: hot air is blown from both sides of the two vertically placed high-temperature-resistant fiber nets and acts on the above-mentioned combination structure layer. On the one hand, the batting as a whole is opened and the structure bulkiness is increased, and the inner and outer layers of the batting produce a uniform porous structure with high porosity, reducing heat convection and enhancing the windproof performance of the batting as a whole. On the other hand, the polyamide acid nanofibers contained therein undergo thermal pressure amidization reaction, the interaction between the fibers produces bonding points that enhance the elastic rebound of the batting, and the mutual entanglement between the fibers enhances the bonding force between the batting layers, forming a three-dimensional crosslinked structure that enhances the mutual bonding force between the combination structure layers, and endowing the batting with excellent mechanical properties and compression rebound performance.

[0148] In this embodiment, the initial hot air temperature in the high-temperature hot air processing process is 150°C, the continuous action time is 65 s, then the temperature is raised at a rate of 2°C / s to a peak temperature of 300°C and the continuous action time is 40 s, and then the temperature is lowered to room temperature by blowing hot air at room temperature. The total time of the hot air processing process is 3 min, and the hot air flow is 2000 m 3 / h;

[0149] Step 7: Cutting and packaging: the batting after high-temperature hot air processing is cut, sterilized by ultraviolet light, rolled and packaged.

[0150] III. Performance

[0151] The three-dimensional heat-insulating wadding with far-infrared temperature rise and windproof properties, prepared according to the process steps of this embodiment, has a surface density of 115±5g / m³. 2 The wadding is 30mm thick, with an overall air permeability of less than 15mm / s, providing good windproof performance. It has a clo value of 5.28 (GB / T 11048-2018), excellent warmth retention, and far-infrared temperature rise function, with a far-infrared emissivity of 0.84 and a temperature rise of 2.9℃ (GB / T 30127-2013). The wadding has a compression rate of more than 50% and a recovery rate of more than 95%. The wadding as a whole also has certain flame-retardant and antibacterial properties.

[0152] Comparative Example 1 (no nano-inorganic ceramic powder particles or inorganic nano-SiO2 powder added to the spinning solution)

[0153] The three-dimensional thermal insulation wadding was prepared using the same steps as in Example 1, except that the nylon fibers were not modified. The modified nylon fibers in Example 1 were replaced with ordinary nylon fibers, and no nano-inorganic ceramic powder particles or inorganic nano-SiO2 powder were added.

[0154] The resulting three-dimensional thermal insulation wadding has a surface density of 115±5 g / m³. 2 The thickness is 30mm, the overall air permeability of the wadding is less than 8mm / s, the windproof effect is excellent, the clo value is 3.26 (GB / T 11048-2018), the heat retention performance is good, but it does not have far-infrared temperature rise function, far-infrared emissivity and temperature rise performance, the wadding compression rate is greater than 60%, the recovery rate is greater than 95%, and the wadding as a whole has certain flame retardant and antibacterial functional characteristics.

[0155] Comparative Example 2 (only nano-inorganic ceramic powder particles were added to the spinning solution)

[0156] The three-dimensional thermal insulation wadding was prepared using the same steps as in Example 1, except that only nano-inorganic ceramic powder particles were added to the nylon fiber during the additive modification process, and no inorganic nano-SiO2 powder was added.

[0157] The resulting three-dimensional thermal insulation wadding has a surface density of 115±5 g / m³. 2 The thickness is 30mm, the overall air permeability of the wadding is less than 8mm / s, the windproof effect is excellent, the clo value is 3.71 (GB / T 11048-2018), the warmth retention performance is good, and it has a certain far-infrared function, but it does not yet meet the functional requirements of the national standard GB / T 30127-2013. The wadding compression rate is greater than 60%, the recovery rate is greater than 95%, and the wadding as a whole has certain flame-retardant and antibacterial functional properties.

[0158] Comparative Example 3 (only inorganic nano-SiO2 powder was added to the spinning solution)

[0159] The three-dimensional structure thermal insulation batt was prepared by the same steps as Example 1, except that only inorganic nano-SiO2 powder was added for additive modification of the nylon fiber, and no nano-inorganic ceramic powder particles were added.

[0160] The obtained three-dimensional structure thermal insulation batt had a surface density of 115±5 g / m 2 , a thickness of 30 mm, an overall air permeability of the batt of less than 8 mm / s, excellent windproof effect, a CLO value of 3.53 (GB / T 11048-2018), better thermal insulation performance, and did not meet the determination requirements of the national standard GB / T 30127-2013 for far infrared temperature rise functionality, a batt compression rate of greater than 60%, a recovery rate of greater than 95%, and the batt as a whole had certain flame retardant and antibacterial functional properties.

[0161] Comparative Example 4 (step 5 - high temperature hot air processing process was omitted)

[0162] The batt was prepared by the same steps as Example 1, except that the step 6 - high temperature hot air processing process was omitted.

[0163] The three-dimensional sandwich structure batt combination layer prepared according to the present embodiment had no binding force between the polyamide acid nanofiber membrane layer and the far infrared temperature rise modified nylon fiber combination, and was only a simple stacking, and the batt was not formed and did not have a three-dimensional structure; the far infrared temperature rise modified nylon fiber combination can be used as a batt, with a surface density of 100 g / m 2 , a thickness of 25 mm, an air permeability of greater than 200 mm / s, poor windproof effect, a CLO value of 2.73 (GB / T 11048-2018), a compression rate of greater than 50%, a recovery rate of greater than 90%, and far infrared temperature rise functionality, wherein the far infrared emissivity was 0.84 and the temperature rise was 3.0℃ (GB / T 30127-2013), and did not have other functional properties.

[0164] Comparative Example 5 (different raw material composition of modified nylon fiber spinning solution)

[0165] The batt was prepared by the same steps as Example 1, except that the modified nylon spinning solution was made from the following raw materials in parts by weight: nylon 66 chips 90 parts, nano-inorganic ceramic powder particles 7 parts, and inorganic nano-SiO2 powder 3 parts.

[0166] The three-dimensional thermal insulation batt with far infrared temperature rise and windproof performance prepared according to the process steps of the present embodiment had a surface density of 115±5 g / m 2, the thickness is 30mm, the overall air permeability of the batt is less than 8mm / s, the windproof effect is excellent, the CLO value is 5.57 (GB / T 11048-2018), the warmth retention performance is excellent, and it has far infrared temperature rise function, wherein the far infrared emissivity is 0.83, the temperature rise is 2.6 DEG C (GB / T 30127-2013), the batt compression rate is greater than 60%, the recovery rate is greater than 95%, and the batt as a whole has certain flame retardant and antibacterial functional properties. In addition, it is found in the experiment that when the total amount of nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder particles added in the modified nylon fiber spinning solution exceeds 15 parts, the strength and other basic physical properties of the modified nylon fiber spun by the melt spinning method will decrease, and when the amount of the added powder particles is further increased, the modified nylon fiber cannot be spun into shape.

[0167] The application has been described in detail above. For those skilled in the art, the application can be implemented in a wider range under equivalent parameters, concentrations and conditions without departing from the purpose and scope of the application. Although the application gives a special example, it should be understood that the application can be further improved. In summary, according to the principle of the application, the present application intends to include any change, use or improvement of the application, including changes made by conventional techniques known in the art, which deviates from the range disclosed in the present application.

Claims

1. A three-dimensional thermal insulation quilt with far-infrared temperature rise and windproof properties, characterized in that: It comprises a first polyimide nanofiber layer, a far-infrared temperature-heat modified nylon fiber layer, and a second polyimide nanofiber layer, which are stacked sequentially from top to bottom; The far-infrared temperature-raising three-dimensional heat-insulating wadding is made of a first polyamic acid nanofiber membrane, a far-infrared temperature-raising modified nylon fiber assembly, and a second polyamic acid nanofiber membrane stacked sequentially. In the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane, the polyamic acid nanofiber membrane is made of polyamic acid nanofibers; The far-infrared temperature rise modified nylon fiber assembly is made of modified nylon fiber and polyamic acid nanofiber. The modified nylon fiber is made of modified nylon fiber spinning solution, which is made of nylon chips, nano-inorganic ceramic powder particles and inorganic nano-SiO2 powder. In the first polyamic acid nanofiber membrane, the far-infrared temperature-modified nylon fiber assembly, and the second polyamic acid nanofiber membrane, the polyamic acid nanofibers used are all made from polyamic acid spinning solution.

2. The three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof performance according to claim 1, characterized in that: The thickness of the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane is 0.2-0.5 mm, and the pore size is 0.5-2.5 μm; The thickness of the far-infrared temperature-modified nylon fiber assembly is 2–45 mm.

3. The three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof performance according to any one of claims 1-2, characterized in that: Based on the total weight of the fibers used to prepare the far-infrared temperature-rising modified nylon fiber assembly as 100%, the weight ratio of the modified nylon fiber to the polyamic acid nanofiber is (80%–90%):(10%–20%). Based on the total weight of polyamic acid nanofibers as 100%, the weight ratio of polyamic acid nanofibers used to prepare the first polyamic acid nanofiber membrane, the far-infrared temperature-raised modified nylon fiber assembly, and the second polyamic acid nanofiber membrane is (20%–35%):(30%–50%):(20%–35%).

4. The far-infrared temperature-raising three-dimensional thermal insulation wadding according to any one of claims 1-3, characterized in that: Based on a total weight of 100 parts, the modified nylon fiber spinning solution is made from the following raw materials in parts by weight: 85-95 parts nylon chips, 4-10 parts nano-inorganic ceramic powder particles, and 1-5 parts inorganic nano-SiO2 powder.

5. The three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof performance according to any one of claims 1-4, characterized in that: In the first polyamic acid nanofiber membrane, the far-infrared temperature-heat modified nylon fiber assembly, and the second polyamic acid nanofiber membrane, the polyamic acid nanofibers have a diameter of 80-200 nm and a length of 30-70 mm. In the first polyamic acid nanofiber membrane, the far-infrared temperature-modified nylon fiber assembly, and the second polyamic acid nanofiber membrane, the cross-section of the polyamic acid nanofiber is circular.

6. The three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof performance according to any one of claims 1-5, characterized in that: The modified nylon fiber has a fiber fineness of 0.5–5 dtex and a length of 30–55 mm; The modified nylon fiber has a cross-sectional shape that is one or more of the following: circular, polygonal, or irregular.

7. The three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof performance according to any one of claims 1-6, characterized in that: The nylon chips are one of polycaprolactam chips, polyhexamethylene adipamide chips, and polypentanediamine adipate chips. The nano-inorganic ceramic powder particles are one or more of nano-alumina, nano-magnesium oxide, nano-titanium dioxide, nano-zirconia, and nano-zinc oxide.

8. A method for preparing the three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof properties as described in any one of claims 1-7, comprising the following steps: 1) The modified nylon fiber spinning solution is spun into fibers, and then cut to obtain the modified nylon fibers; 2) The polyamic acid spinning solution is spun into nanofibers, which are then cut to obtain the polyamic acid nanofibers; 3) The modified nylon fiber and the polyamic acid nanofiber are mixed and sequentially subjected to opening, carding, web laying and stretching processes to obtain the far-infrared temperature rise modified nylon fiber assembly; 4) The polyamic acid spinning solution is spun into nanofibers and stacked into a film to obtain the first polyamic acid nanofiber film and the second polyamic acid nanofiber film, respectively. 5) The first polyamic acid nanofiber membrane, the far-infrared temperature-raising modified nylon fiber assembly, and the first polyamic acid nanofiber membrane are stacked sequentially to form a sandwich assembly structure, and then placed between two parallel fiber nets or metal nets placed on the left and right for hot air treatment. After imidization, the far-infrared temperature-raising three-dimensional heat-insulating wadding is obtained.

9. The method for preparing the three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof properties according to claim 8, characterized in that: In step 1), the fiber is spun using melt spinning. In steps 2) and 4), the nanofibers are spun using electrospinning. In step 5), the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane in the sandwich composite structure are arranged in parallel with two fiber meshes or metal meshes. The hot air treatment is bidirectional blowing, with hot air blowing from the outside to the inside of both sides of the sandwich structure perpendicular to the first polyamic acid nanofiber membrane and the second polyamic acid nanofiber membrane in a horizontal direction. The distance between the two fiber meshes or metal meshes is 3 to 50 mm; In the hot air treatment step, the initial hot air temperature is 130-160℃, and the duration of application is X seconds. Then, the temperature is increased at a rate of 2-5℃ / s to a peak temperature of 260-350℃, with a heating time of Y seconds. After reaching the peak temperature, the peak temperature is maintained for Z seconds, and then the temperature is lowered to room temperature by blowing air at room temperature. The total time of the hot air processing step (X+Y+Zs) is 120-300 seconds, and the hot air volume is 1000-2500 m³ / s. 3 / h.

10. A thermal insulation product, characterized in that, The three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof properties as described in any one of claims 1-7, or the three-dimensional thermal insulation wadding with far-infrared temperature rise and windproof properties prepared by the preparation method described in any one of claims 8-9.

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