An energy-saving and controllable spraying system for preparing composite materials and its application

Abstract

The present invention relates to an energy-saving and controllable spraying system for preparing composite materials and its application. The system includes: an impregnating tray (9) for placing and weighing a fiber mat (7) to be sprayed; a controllable spraying machine (3) for spraying a sol onto the fiber mat (7); one end of the controllable spraying machine (3) is connected to a raw material storage tank (1) filled with sol raw materials, and the other end is provided with a plurality of nozzles (6), which are located above the fiber mat (7). This system is applied to the preparation of composite materials. Compared with the prior art, the present invention has the advantages of uniform irrigation, raw material saving, the fiber mat is not easily broken, and high flatness, etc.

Description

Technical Field

[0001] The present invention relates to the field of composite material preparation, and particularly to an energy-saving and controllable spraying system for composite material preparation and its application. Background Art

[0002] In the process of preparing composite materials, when the sol is poured onto the fiber mat, it is very easy to cause uneven pouring on the surface of the fiber mat and uneven material due to unreasonable ratio of glue and liquid and semi-automatic pouring device. At the same time, the aerogel material is prone to shedding dust or particles. Excessive pouring will not only cause excessive dust and allergic reactions in the human body, but also reduce the performance of the aerogel-based material. It is not only not environmentally friendly, causing environmental pollution, but also wasting raw materials, bringing unnecessary economic losses to operators.

[0003] The existing pouring devices generally directly pour the sol onto the fiber mat, which will cause uneven pouring on the surface of the fiber mat, risk of raw material waste, material loss, and even surface contamination, low production efficiency, and risk of environmental pollution. On the other hand, after the poured fiber mat is dried, due to the action of gravity sedimentation, the density of the composite material will be uneven up and down, not meeting the production requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy-saving and controllable spraying system for composite material preparation and its application, which can pour raw materials onto the fiber mat in a controllable, uniform, environmentally friendly and sustainable manner without dead angles in all directions.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An energy-saving and controllable spraying system for composite material preparation, the system includes:

[0007] An impregnation tray for placing and weighing the fiber mat to be sprayed;

[0008] A controllable spraying machine for spraying sol onto the fiber mat;

[0009] One end of the controllable spraying machine is connected to a raw material storage tank containing sol raw materials, and the other end is provided with a plurality of nozzles, which are located above the fiber mat.

[0010] Further, the controllable spraying machine includes a ratio control reaction tank and a movable spraying device. The ratio control reaction tank is located between the raw material storage tank and the movable spraying device, and the nozzles are arranged on the movable spraying device.

[0011] The ratio control reaction tank is used to control the specific gravity and flow rate of the sol, and can determine the initial ratio of the solvent and solute in the sol according to needs.

[0012] Lay the fiber felt to be sprayed flat in the sizing tray for preparation. By calculating the density or weight of the fiber felt, the dosage and specific gravity of the sol to be poured can be obtained through the proportion control reaction tank. Thus, the dosage of the sol can be accurately calculated by the proportion control reaction tank, and the sol is sprayed onto the fiber felt evenly, moderately and uniformly through the nozzle. In this way, the surface of the fiber felt impregnated with the sol is very flat, the density is uniform in the horizontal direction, and the efficiency is significantly improved.

[0013] Furthermore, a conveying pipeline is provided between the proportion control reaction tank and the raw material storage tank, and a conveying pump and / or a valve are provided on the conveying pipeline.

[0014] The sol raw material is conveyed into the proportion control reaction tank by the conveying pump, then output from the proportion control reaction tank to the movable sprayer, and finally flows out through the nozzle.

[0015] Furthermore, the sizing tray is electrically connected to the proportion control reaction tank.

[0016] The proportion control reaction tank can know how much sol with what density should be prepared according to the fiber felt weight indication feedback in the sizing tray, and first determine the absolute amount of the solute.

[0017] Furthermore, a liquid leakage port is opened at the bottom of the sizing tray, and the liquid leakage port is connected to the proportion control reaction tank.

[0018] During spraying, there will inevitably be a certain amount of accumulated liquid at the bottom of the sizing tray. At this time, circulating this accumulated liquid back to the proportion control reaction tank will neither cause waste of resources nor effectively prevent the defect of uneven density caused by gravity precipitation during the preparation of the composite material.

[0019] After circulation, since the sol is sprayed from top to bottom in a spraying manner, it is easier to dry. Almost drying can be carried out while spraying. After several circulations, almost all that remains in the proportion control reaction tank is the solvent. At this time, the sprayed fiber felt is removed from the sizing tray and simply dried, and a composite material with uniform density up and down can be obtained.

[0020] Furthermore, the cross-section of the nozzle is an isosceles trapezoid;

[0021] The axial direction of the nozzle forms an angle of 78 - 82° with the plane where the fiber felt is located, preferably 80°.

[0022] Furthermore, the wide mouth of the nozzle faces upward and is seamlessly connected to the movable sprayer, the narrow mouth faces downward and is aligned with the fiber felt.

[0023] Furthermore, the number of the nozzles is at least 6 and they are evenly arranged, and the first nozzle and the last nozzle are located near the edge of the fiber felt to achieve full coverage.

[0024] Furthermore, during spraying, the dipped glue tray is placed on a console.

[0025] Furthermore, the raw material storage tank includes a sol solvent tank and a sol solute storage tank.

[0026] An energy-saving controllable spraying system for preparing composite materials as described above is used for preparing composite materials.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) The spraying system of the present invention includes a ratio control reaction box, which can achieve uniform spraying by controlling the amount of sol given to the nozzle, thereby solving the problem of uneven surface of the fiber felt, local thick or local thin, and uneven surface of the whole material due to excessive or insufficient amount of sol sprayed, fast or slow flow rate of the nozzle in the existing process;

[0029] (2) The spraying system of the present invention improves the material properties of the inorganic solid fiber felt by achieving uniform pouring of the raw materials, so that the value of the material can be effectively realized, which helps to improve the efficiency of the subsequent process and thus improve the overall production efficiency;

[0030] (3) The spraying system of the present invention can calculate the corresponding raw material dosage in advance by measuring the density of the fiber mat to be poured, thereby reducing unnecessary waste of raw materials and reducing energy consumption. It can effectively reduce the material loss rate in the production process, save material dosage, reduce energy consumption, and reduce production activity costs for the company;

[0031] (4) The spraying system of the present invention solves the problem of excessive dust pollution and environmental damage caused by inappropriate watering through a controllable dosage setting, and can also avoid the occurrence of human allergies. It is also an environmentally friendly design that meets the requirements of modern manufacturing and service industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the spraying system in Example 1;

[0033] As shown in the figure: raw material storage tank 1, conveying pipeline 2, controllable sprayer 3, ratio control reaction box 4, movable sprayer 5, nozzle 6, fiber felt 7, control console 8, and dipping tray 9. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0035] Embodiment 1

[0036] An energy-saving and controllable spraying system for preparing composite materials, as Figure 1 , the system includes: an impregnating tray 9 for placing and weighing the fiber mat 7 to be sprayed; a controllable spraying machine 3 for spraying the sol onto the fiber mat 7; one end of the controllable spraying machine 3 is connected to the raw material storage tank 1 containing the sol raw materials, and the other end is provided with a plurality of nozzles 6, and the nozzles 6 are located above the fiber mat 7. The cross-section of the nozzle 6 is an isosceles trapezoid; its axial direction forms an angle of 80° with the plane where the fiber mat 7 is located. The wide mouth of the nozzle 6 faces upward and is seamlessly connected to the movable spraying device 5, the narrow mouth faces downward, and is aligned with the fiber mat 7. The number of nozzles 6 is 6, and they are evenly arranged, and the first nozzle and the last nozzle are located near the edge of the fiber mat 7 to achieve full coverage.

[0037] During spraying, the impregnating tray 9 is placed on the console 8. The raw material storage tank 1 includes a sol solvent tank and a sol solute storage tank. The controllable spraying machine 3 includes a proportion control reaction tank 4 and a movable spraying device 5. The proportion control reaction tank 4 is located between the raw material storage tank 1 and the movable spraying device 5, and the nozzles 6 are arranged on the movable spraying device 5. The proportion control reaction tank 4 is used to control the specific gravity and flow rate of the sol, and can first determine the absolute amount of the solute in the sol.

[0038] A conveying pipeline 2 is provided between the proportion control reaction tank 4 and the raw material storage tank 1, and a conveying pump and a valve are provided on the conveying pipeline 2. The sol raw materials are conveyed into the proportion control reaction tank 4 by the conveying pump, and then output from the proportion control reaction tank 4 into the movable spraying device 5, and finally flow out through the nozzles 6.

[0039] The impregnating tray 9 is electrically connected to the proportion control reaction tank 4. A liquid leakage port is opened at the bottom of the impregnating tray 9, and the liquid leakage port is connected to the proportion control reaction tank 4, and a booster pump can be provided in the connecting pipeline. During spraying, it is inevitable that there will be a certain amount of accumulated liquid at the bottom of the impregnating tray 9. At this time, the accumulated liquid is circulated back to the proportion control reaction tank 4, which will neither cause waste of resources nor effectively alleviate the defect of uneven density caused by gravity precipitation during the preparation of composite materials.

[0040] When using this system for spraying, it mainly includes the following steps:

[0041] Lay the fiber mat 7 flat in the impregnating tray 9;

[0042] The proportion control reaction tank 4 calculates the required amount and specific gravity of the sol based on the density or weight of the fiber mat 7, and then inputs the solute and solvent into the movable sprayer 5 through a transfer pump;

[0043] The sol flows from the proportion control reaction tank 4 into the movable sprayer 5 and is evenly sprayed onto the fiber mat 7 through the nozzle 6 at a constant speed, in an appropriate amount, and uniformly; during this period, the accumulated liquid at the bottom of the impregnation tray 9 will circulate back to the proportion control reaction tank 4;

[0044] Finally, since a certain amount of the solvent will volatilize during spraying, the solute will gradually adhere to the fiber mat 7. During circulation, some solvent can be supplemented to the proportion control reaction tank 4 through the solvent storage tank to prevent the solute from remaining in the proportion control reaction tank 4;

[0045] After several cycles, almost all that remains in the proportion control reaction tank 4 is the solvent. At this time, spraying is stopped, the fiber mat 7 is transferred, and dried to obtain the composite material.

[0046] In this embodiment, the fiber mat 7 used is quartz fiber with a density of 0.150 g / cm³, dimensions of 150 mm × 300 mm × 10 mm, 3 and the sprayed sol is a 10 wt% sol prepared from silica aerogel and ethanol.

[0047] After spraying and drying, 4 pieces A, B, C, D are randomly cut from the composite material along the length and width directions, and one of them, A, is cut into three layers a, b, c along the thickness direction. The measured density results are shown in Table 1 (density unit: g / cm³). 3 )

[0048] Comparative Example 1

[0049] In this example, the prepared sol is placed in a small cup, and then poured and irrigated onto the fiber mat 7 manually. After several irrigations, it is dried.

[0050] In this example, the fiber mat 7 used is quartz fiber with a density of 0.150 g / cm³, dimensions of 150 mm × 300 mm × 10 mm, 3 and the irrigated sol is a 10 wt% sol prepared from silica aerogel and ethanol.

[0051] After irrigation and drying, 4 pieces A, B, C, D are randomly cut from the composite material along the length and width directions, and one of them, A, is cut into three layers a, b, c along the thickness direction. The measured density results are shown in Table 1 (density unit: g / cm³). 3 )

[0052] Comparative Example 2

[0053] In this example, the fiber felt 7 was impregnated in a mold filled with the prepared sol. After impregnation for a period of time, it was taken out for drying.

[0054] In this example, the fiber felt 7 used was quartz fiber with a density of 0.150 g / cm of 150 mm × 300 mm × 10 mm. 3 The sol impregnated was a 10 wt% sol prepared from silica aerogel and ethanol.

[0055] After impregnation and drying, 4 pieces A, B, C, and D were randomly cut from the composite material along the length and width directions, and one of them, A, was cut into three layers a, b, and c along the thickness direction. The measured density results are shown in Table 1 (density unit: g / cm 3 ).

[0056] Table 1

[0057]

[0058] It is not difficult to see from the above results that when facing a system where curing and drying must be carried out simultaneously in an open system, using the method shown in Comparative Example 1, similar to watering a flower, will result in the density of the composite material being very uneven in both the horizontal and vertical directions, and the surface of the composite material will be uneven when watering.

[0059] Using the method shown in Comparative Example 2, similar to the impregnation method, although it can solve the problems of surface flatness and density in the horizontal direction, but because there is too much solvent after impregnation and the drying speed is too slow, it will give the sol enough time to settle, which will result in a very high density in the lower part of the composite material and a very low density on the surface.

[0060] Using the spraying system of the present invention and equipped with a sol circulation mechanism can ensure that the subsequent drying cycle is shortened, and the sol is continuously mixed and sprayed from the upper part, ultimately resulting in a uniform density in both the horizontal and vertical directions of the composite material, and the material has good forming and a short drying cycle.

[0061] The above is only a preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An energy-saving and controllable spraying system for preparing composite materials, characterized in that, The system includes: An impregnating tray (9) for placing and weighing the fiber mat (7) to be sprayed; A controllable spraying machine (3) for spraying sol onto the fiber mat (7); One end of the controllable spraying machine (3) is connected to a raw material storage tank (1) containing sol raw materials, and the other end is provided with a plurality of nozzles (6) which are located above the fiber mat (7); The controllable spraying machine (3) includes a proportioning control reaction tank (4) and a movable sprayer (5). The proportioning control reaction tank (4) is located between the raw material storage tank (1) and the movable sprayer (5), and the nozzles (6) are arranged on the movable sprayer (5); The cross-section of the nozzle (6) is an isosceles trapezoid; The axis of the nozzle (6) forms an angle of 78 - 82° with the plane where the fiber mat (7) is located; When spraying with the energy-saving controllable spraying system for preparing composite materials, the specific steps are as follows: Lay the fiber mat (7) flat in the impregnating tray (9); The proportioning control reaction tank (4) calculates the amount and specific gravity of the sol required based on the density or weight of the fiber mat (7), and then inputs the solute and solvent into the proportioning control reaction tank (4) through a transfer pump; The sol flows from the proportioning control reaction tank (4) into the movable sprayer (5), and is evenly sprayed onto the fiber mat (7) through the nozzles (6) at a constant speed, in an appropriate amount and uniformly. During this period, the liquid accumulated at the bottom of the impregnating tray (9) will circulate back to the proportioning control reaction tank (4); Finally, since a certain amount of solvent will volatilize during spraying, the solute will gradually adhere to the fiber mat (7). During circulation, some solvent can be added to the proportioning control reaction tank (4) through the solvent storage tank to prevent the solute from remaining in the proportioning control reaction tank (4); After several cycles, almost only the solvent remains in the proportioning control reaction tank (4). At this time, stop spraying, transfer the fiber mat (7), and dry it to obtain the composite material.

2. The energy-saving and controllable spraying system for preparing composite materials according to claim 1, wherein, A transfer pipeline (2) is provided between the proportioning control reaction tank (4) and the raw material storage tank (1), and a transfer pump and / or a valve are arranged on the transfer pipeline (2).

3. An energy-saving and controllable spraying system for preparing composite materials according to claim 1, characterized in that, The impregnating tray (9) is electrically connected to the proportioning control reaction tank (4).

4. An energy-saving and controllable spraying system for preparing composite materials according to claim 1, characterized in that, A liquid leakage port is opened at the bottom of the impregnating tray (9), and the liquid leakage port is connected to the proportioning control reaction tank (4).

5. An energy-saving and controllable spraying system for preparing composite materials according to claim 1, characterized in that, The wide mouth of the nozzle (6) faces upward and is seamlessly connected to the movable sprayer (5), and the narrow mouth faces downward and is aligned with the fiber mat (7).

6. The energy-saving and controllable spraying system for preparing composite materials according to claim 1, wherein, During spraying, the impregnating tray (9) is placed on the control console (8).

7. An energy-saving and controllable spraying system for preparing composite materials according to claim 1, wherein, The raw material storage tank (1) includes a sol solvent tank and a sol solute storage tank.

8. An energy-saving and controllable spraying system for preparing the composite material according to any one of claims 1-7, characterized in that, This system is applied to the preparation of composite materials.

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