Preparation method of heat-resistant and waterproof multilayer nano material

Abstract

The invention discloses a preparation method of a heat-resistant and waterproof multilayer nano material. The preparation method specifically comprises the following steps: S1, preparing alumina fiber cotton; s3, slicing: slicing the alumina fiber cotton by adopting a high-pressure water cutter head to obtain flaky fiber cotton; s4, modification: performing atomization spraying on the flaky fiber cotton by using the oily modification liquid to obtain a fiber single-layer blank body; and S5, needling and roasting are conducted, specifically, the multiple layers of fiber single-layer blanks are sequentially stacked, needled and roasted, and the hydrophobic and ultra-high-temperature-resistant nano-porous silicon dioxide and aluminum oxide fiber multi-layer nano-material is obtained. A multi-layer stacked and compounded high-temperature-resistant and high-humidity-resistant hydrophobic protection layer is formed in the multi-layer nano-material, and the super-high-temperature-resistant and high-humidity-resistant hydrophobic protection layer is formed; and the use performance of the final alumina fiber product is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber cotton production, and more specifically, to a method for preparing a heat-resistant and waterproof multilayer nanomaterial. Background Art

[0002] Alumina ceramic fiber can work stably for a long time in a high temperature environment, has excellent heat resistance, and can withstand temperatures up to 1800 degrees Celsius. However, alumina fiber has a certain hygroscopicity, which will affect its performance, especially in a high temperature and high humidity environment, the problem of moisture absorption is more serious. At present, there is no effective solution to this shortcoming in the industry. Ordinary waterproof coatings will greatly reduce the thermal insulation and fireproof properties of alumina fiber products. Moreover, alumina fiber must be needle-punched and roasted before it can be impregnated with a modified liquid for subsequent processing. However, before needle-punching and roasting, alumina fiber cannot be modified in an aqueous solution, which will make the alumina fiber not have subsequent processing performance. In addition, after needle-punching and roasting, the impregnation modification is carried out, and the modified liquid usually cannot penetrate the interior of the alumina fiber, and the modification effect is not ideal. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a method for preparing a multilayer nanomaterial that is heat-resistant and waterproof.

[0004] To achieve the above purpose, the invention has the following innovative features: specifically comprising the following steps: S1. Preparing alumina fiber cotton: mixing aluminum sol, silica sol and spinning aid, and then concentrating to prepare spinning solution, and spinning the spinning solution into fiber cotton through a spinning process to obtain alumina fiber cotton; S2, slicing: using a high-pressure water jet head to slice the alumina fiber cotton to obtain sheet-like fiber cotton; S3, modification: spraying the oily modified liquid on the sheet-like fiber cotton to obtain a fiber single-layer embryo; S4, needle puncture and calcination: stack, needle puncture and calcine several layers of fiber single-layer embryos in sequence to obtain a multi-layer nanomaterial of hydrophobic and ultra-high temperature resistant nanoporous silica and alumina fibers.

[0005] Furthermore, the oily modified liquid is an oily nanoporous silica modified liquid.

[0006] Furthermore, the upper surface and the lower surface of the sheet-like fiber cotton are arc-shaped grooves and arc-shaped protrusions respectively. When two sheet-like fiber cottons are stacked, the arc-shaped protrusions fit tightly inside the arc-shaped grooves.

[0007] Furthermore, the diameter of the particles atomized and sprayed on the upper surface of the sheet-like fiber cotton is 0.6mm-1.2mm, and the diameter of the particles atomized and sprayed on the lower surface of the sheet-like fiber cotton is 0.3mm-0.6mm.

[0008] Furthermore, the nozzle for atomizing spraying of the above-mentioned sheet-like fiber cotton is a double-layer nozzle, and the double-layer spraying includes a front spray cap and a rear spray cap. The front spray cap is rotatably arranged on the outside of the rear spray cap, and the end faces of the front spray cap and the rear spray cap are respectively provided with a plurality of front spray holes and rear spray holes of the same caliber, and the outer side walls of the rear spray cap are respectively provided with a first limit baffle and a second limit baffle, and the inner side wall of the front spray cap is provided with a movable baffle. When the movable baffle and the first limit baffle collide with each other, the front spray holes and the rear spray holes overlap with each other, and when the movable baffle and the second limit baffle collide with each other, the front spray holes and the rear spray holes are staggered with each other.

[0009] Furthermore, the diameters of the front spray hole and the rear spray hole are both 1.2 mm.

[0010] Furthermore, a mounting base is provided at the bottom of the double-layer nozzle, the mounting base is provided with an annular groove, a through hole is provided inside the annular groove, the rear spray cap is integrally formed on the through hole, the front spray cap is rotatably arranged on the annular groove, a fixing ring is provided on the outer side of the annular groove, and a nut that can move up and down is provided at the bottom of the front spray cap, and the nut is threadedly connected to the fixing ring, so that the position of the front spray cap is fixed.

[0011] Furthermore, a sleeve is provided at one end of the nut, a plurality of slots are provided inside the sleeve, a plurality of clamping plates are provided on the outside of the front spray cap, and the clamping plates are slidably arranged inside the slots.

[0012] The technical effects and advantages of the present invention are as follows: the present invention selects a high-pressure water jet to slice the alumina fiber cotton. This cutting method makes the upper and lower surfaces of the sheet fiber cotton flat and smooth, reduces the generation of burrs on the surface of the sheet fiber cotton, and thus lays a foundation for the subsequent oily modified liquid to fully impregnate the interior of the sheet fiber cotton. The oily modified liquid is atomized and sprayed on the sheet fiber cotton, so that the oily modified liquid can be fully and completely impregnated into the interior of the sheet fiber cotton. Finally, through stacking, acupuncture, and roasting, a multi-layer superimposed composite high-temperature and high-humidity resistant hydrophobic protective layer is formed inside the multi-layer nanomaterial, which effectively improves the performance of the final product of the alumina fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a side structural diagram of the multilayer nanomaterial of the present invention.

[0014] Figure 2 It is a cross-sectional view of the end face of the double-layer nozzle of the present invention.

[0015] Figure 3 It is a side structural diagram of the double-layer nozzle of the present invention.

[0016] Figure 4 It is an end cross-sectional view of the connection between the sleeve and the bottom of the front spray cap of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 to Figure 2 A specific implementation of the present invention includes the following steps: S1. Preparing alumina fiber cotton: mixing aluminum sol, silica sol and spinning aid, and then concentrating to prepare spinning solution, and spinning the spinning solution into fiber cotton through a spinning process to obtain alumina fiber cotton; S2, slicing: slicing the alumina fiber cotton with a high-pressure water jet head to obtain sheet-like fiber cotton 1; S3, modification: spraying the oily modified liquid on the sheet-like fiber cotton 1 to obtain a fiber single-layer embryo; S4, needle puncture and calcination: stack, needle puncture and calcine several layers of fiber single-layer embryos in sequence to obtain a multi-layer nanomaterial of hydrophobic and ultra-high temperature resistant nanoporous silica and alumina fibers.

[0019] In the present invention, a high-pressure water jet is selected to slice the alumina fiber cotton. This cutting method makes the upper and lower surfaces of the sheet-like fiber cotton 1 smooth and flat, reduces the generation of burrs on the surface of the sheet-like fiber cotton 1, and lays a foundation for the subsequent oily modified liquid to fully impregnate the interior of the sheet-like fiber cotton 1. The oily modified liquid is atomized and sprayed on the sheet-like fiber cotton 1, so that the oily modified liquid can be fully and completely impregnated into the interior of the sheet-like fiber cotton 1. Finally, through stacking, needling, and roasting, a multi-layer superimposed composite high-temperature and high-humidity resistant hydrophobic protective layer is formed inside the multi-layer nanomaterial, which effectively improves the performance of the final product of the alumina fiber.

[0020] In the present invention, as a preferred embodiment, the oily modified liquid is an oily nanoporous silica modified liquid.

[0021] In the present invention, as a preferred embodiment, the upper surface and lower surface of the sheet-like fiber cotton 1 are respectively an arc-shaped groove 11 and an arc-shaped protrusion 12 . When two sheet-like fiber cottons 1 are stacked, the arc-shaped protrusion 12 fits tightly inside the arc-shaped groove 11 .

[0022] In the present invention, the setting of the arc-shaped groove 11 and the arc-shaped protrusion 12 increases the impregnation area of ​​the surface of the sheet-like fiber cotton 1 , thereby ensuring that the sheet-like fiber cotton 1 is fully impregnated.

[0023] In the present invention, as a preferred embodiment, the diameter of the particles atomized and sprayed on the upper surface of the sheet-like fiber cotton 1 is 0.6mm-1.2mm, and the diameter of the particles atomized and sprayed on the lower surface of the sheet-like fiber cotton 1 is 0.3mm-0.6mm.

[0024] In the present invention, the upper surface of the sheet-like fiber cotton 1 is an arc-shaped groove 11, and the diameter of the particles of the atomized spray is relatively large. This large-particle atomized spray allows more oily modifying liquid to remain inside the arc-shaped groove 11, and the arc-shaped groove 11 can temporarily accommodate large particles of oily modifying liquid, ensuring that the upper surface of the sheet-like fiber cotton 1 is fully impregnated, and the lower surface of the sheet-like fiber cotton 1 is an arc-shaped protrusion 12, and the diameter of the particles of the atomized spray is relatively small. This small-particle atomized spray avoids excessive spraying of the oily modifying liquid and avoids the oily modifying liquid from directly leaking out from the surface of the arc-shaped protrusion 12, resulting in waste of the oily modifying liquid.

[0025] In the present invention, as a preferred embodiment, the nozzle for atomizing and spraying the sheet-like fiber cotton 1 is a double-layer nozzle 2, and the double-layer spraying includes a front spray cap 21 and a rear spray cap 22. The front spray cap 21 is rotatably arranged on the outside of the rear spray cap 22, and the end faces of the front spray cap 21 and the rear spray cap 22 are respectively provided with a plurality of front spray holes 3 and rear spray holes 31 of the same caliber, and the outer wall of the rear spray cap 22 is respectively provided with a first limit baffle 32 and a second limit baffle 33, and the inner wall of the front spray cap 21 is provided with a movable baffle 34. When the movable baffle 34 and the first limit baffle 32 collide with each other, the front spray hole 3 and the rear spray hole 31 overlap with each other, and when the movable baffle 34 and the second limit baffle 33 collide with each other, the front spray hole 3 and the rear spray hole 31 are staggered with each other, wherein the calibers of the above-mentioned front spray hole 3 and the rear spray hole 31 are both 1.2 mm.

[0026] In the present invention, when it is necessary to perform atomization spraying on the upper surface of the sheet-like fiber cotton 1, the front spray cap 21 is rotated so that the movable baffle 34 abuts against the first limit baffle 32. At this time, the front spray hole 3 and the rear spray hole 31 overlap each other, and the atomized sprayed particles reach 1.2mm, so that the atomized sprayed particles on the upper surface of the sheet-like fiber cotton 1 can reach 1.2mm. When it is necessary to perform atomization spraying on the lower surface of the sheet-like fiber cotton 1, the front spray cap 21 is rotated so that the movable baffle 34 abuts against the second limit baffle 33. At this time, the front spray hole 3 and the rear spray hole 31 are staggered with each other. This staggering makes the overlapping apertures of the front spray hole 3 and the rear spray hole 31 be 0.3mm-0.6mm, so that the atomized sprayed particles on the lower surface of the sheet-like fiber cotton 1 can reach 0.3mm-0.6mm.

[0027] In summary, double-layer atomization spraying can simultaneously meet the needs of atomization spraying on the upper and lower surfaces of the sheet-like fiber cotton 1, and during the rotation of the front spray cap 21, it can disturb the oily modified liquid inside the nozzle to prevent the oily modified liquid from being blocked inside the nozzle.

[0028] In the present invention, as a preferred solution, the bottom of the double-layer nozzle 2 is provided with a mounting base 4, the mounting base 4 is provided with an annular groove 41, the inside of the annular groove 41 is provided with a through hole 42, the rear spray cap 22 is integrally formed on the through hole 42, the front spray cap 21 is rotatably arranged on the annular groove 41, the outer side of the annular groove 41 is provided with a fixing ring 43, the bottom of the front spray cap 21 is provided with a nut 44 that can move up and down, the nut 44 is threadedly connected to the fixing ring 43, so that the position of the front spray cap 21 is fixed.

[0029] In the present invention, when the movable baffle 34 abuts against the first limiting plate or the second limiting plate, it is only necessary to move the nut 44 downward to the fixing ring 43 and finally fix the nut 44 on the fixing ring 43, thereby fixing the position of the front spray cap 21.

[0030] In the present invention, as a preferred solution, a sleeve 5 is provided at one end of the nut 44, a plurality of slots 51 are provided inside the sleeve 5, a plurality of clamping plates 52 are provided outside the front spray cap 21, and the clamping plates 52 are slidably arranged inside the slots 51.

[0031] In the present invention, the up and down movement of the nut 44 at the bottom of the front spray cap 21 is realized by the sleeve 5. When the sleeve 5 moves up and down, the clamping plate 52 slides up and down inside the clamping groove 51. At the same time, the clamping plate 52 is restricted inside the clamping groove 51, so that when the sleeve 5 is fixed to the fixing ring 43 by bolts, the position of the front nut is also fixed.

[0032] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a heat-resistant and waterproof multilayer nanomaterial, characterized in that: The specific steps include: S1. Preparing alumina fiber cotton: mixing aluminum sol, silica sol and spinning aid, and then concentrating to prepare spinning solution, and spinning the spinning solution into fiber cotton through a spinning process to obtain alumina fiber cotton; S2, slicing: using a high-pressure water jet to slice the alumina fiber cotton to obtain sheet-like fiber cotton (1); S3, modification: spraying the oily modified liquid on the sheet-like fiber cotton (1) to obtain a fiber single-layer embryo; S4, needle puncture and calcination: stack, needle puncture and calcine several layers of fiber single-layer embryos in sequence to obtain a multi-layer nanomaterial of hydrophobic and ultra-high temperature resistant nanoporous silica and alumina fibers.

2. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 1, characterized in that: The oily modified liquid is an oily nanoporous silica modified liquid.

3. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 1, characterized in that: The upper surface and lower surface of the sheet-like fiber cotton (1) are respectively an arc-shaped groove (11) and an arc-shaped protrusion (12); when two sheet-like fiber cottons (1) are stacked, the arc-shaped protrusion (12) fits tightly inside the arc-shaped groove (11).

4. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 3, characterized in that: The diameter of the particles atomized and sprayed on the upper surface of the sheet-like fiber cotton (1) is 0.6 mm to 1.2 mm, and the diameter of the particles atomized and sprayed on the lower surface of the sheet-like fiber cotton (1) is 0.3 mm to 0.6 mm.

5. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 4, characterized in that: The nozzle for atomizing and spraying the sheet-like fiber cotton (1) is a double-layer nozzle (2), and the double-layer spraying comprises a front spray cap (21) and a rear spray cap (22), wherein the front spray cap (21) is rotatably arranged on the outside of the rear spray cap (22), and the end surfaces of the front spray cap (21) and the rear spray cap (22) are respectively provided with a plurality of front spray holes (3) and rear spray holes (31) of the same caliber, and the outer wall of the rear spray cap (22) is respectively provided with a first limit baffle (32) and a second limit baffle (33), and the inner wall of the front spray cap (21) is provided with a movable baffle (34), and when the movable baffle (34) and the first limit baffle (32) collide with each other, the front spray holes (3) and the rear spray holes (31) overlap with each other, and when the movable baffle (34) and the second limit baffle (33) collide with each other, the front spray holes (3) and the rear spray holes (31) are staggered with each other.

6. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 5, characterized in that: The calibers of the front spray hole (3) and the rear spray hole (31) are both 1.2 mm.

7. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 5, characterized in that: The bottom of the double-layer spray head (2) is provided with a mounting base (4), the mounting base (4) is provided with an annular groove (41), a through hole (42) is provided inside the annular groove (41), the rear spray cap (22) is integrally formed on the through hole (42), the front spray cap (21) is rotatably arranged on the annular groove (41), a fixing ring (43) is provided on the outer side of the annular groove (41), and a nut (44) that can move up and down is provided at the bottom of the front spray cap (21), and the nut (44) is threadedly connected to the fixing ring (43), so that the position of the front spray cap (21) is fixed.

8. The method for preparing a heat-resistant and waterproof multilayer nanomaterial according to claim 7, characterized in that: A sleeve (5) is provided at one end of the nut (44), a plurality of slots (51) are provided inside the sleeve (5), a plurality of clamping plates (52) are provided outside the front spray cap (21), and the clamping plates (52) are slidably arranged inside the slots (51).

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