A dual-dimension synergistic anti-tack system

Abstract

The application provides a double-dimension synergistic anti-adhesion system, which comprises a micro-positive pressure device and an anti-adhesion coating (9), wherein the micro-positive pressure device comprises an air pump (1), a pressure regulating valve (2), a hose (3), an air inlet nozzle (4), a cavity body (5), an air flow area (6), a plurality of air outlet holes (7) and a micro pressure sensor (8). The anti-adhesion coating (9) is combined with the micro-positive pressure device through a clever structural design, and the anti-adhesion effect is improved in a double-dimension synergistic manner from a physical and chemical point of view, so that the adhesion of high-viscosity colloids such as hydroxyl glue on the surface of related devices can be avoided, the operation stability and work efficiency of related processes are improved, and the application prospect in the anti-adhesion field is wide.

Description

Technical Field

[0001] This invention relates to the fields of materials science and technology and mechanical engineering technology; in particular, it relates to a two-dimensional synergistic anti-adhesion system. Background Technology

[0002] In manufacturing, especially in fields involving precision weighing and machining, equipment surfaces often need to avoid unnecessary adhesion to adhesives, coatings, or other sticky substances. Hydroxybutyl rubber (HBR), as a major binder for solid propellants, prevents propellant fragmentation caused by the separation or shedding of energetic materials. However, its extremely high viscosity leads to significant adhesion and gelling of propellants during the casting process, accelerating the wear and tear on devices such as hoppers and affecting the accurate metering of propellants. Therefore, designing an anti-adhesion system for casting hoppers is crucial for improving the efficiency of equipment using high-viscosity fluids such as HBR.

[0003] In manufacturing, especially in fields involving precision machining, coating, or assembly, it is crucial to prevent equipment scrapping or increased cleaning costs. Traditional anti-adhesion methods often rely on single chemical coatings, but under certain complex conditions, coatings alone may not fully meet the anti-adhesion requirements. Therefore, developing a two-dimensional synergistic anti-adhesion system that combines physical and chemical methods is particularly important. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-dimensional synergistic anti-adhesion system. This invention achieves a dual-effect anti-adhesion mechanism from both physical and chemical perspectives through a clever internal surface structure and a high-performance anti-adhesion coating. This prevents high-viscosity fluids such as hydroxyl-butyl rubber (HBB) from adhering to the surface of casting equipment, maintaining stable operation of related units, and thus improving the operational stability and efficiency of related equipment containing HBB fluids. This coating is mainly used in military, aerospace, and chemical industries, aiming to provide excellent anti-adhesion performance.

[0005] This invention is achieved through the following technical solution:

[0006] This invention relates to a dual-dimensional synergistic anti-adhesion system, comprising: a micro-positive pressure device and an anti-adhesion coating 9; wherein, the micro-positive pressure device comprises an air pump 1, a pressure regulating valve 2, a hose 3, an air inlet 4, a cavity 5, an airflow zone 6, several air outlets 7, and a miniature pressure sensor 8.

[0007] The air inlet 4 is located on one side of the lower end of the cavity 5 and is connected to the air pump 1 through the hose 3.

[0008] The annular channel formed between the inner and outer walls of the cavity 5 is the airflow zone 6;

[0009] The plurality of air outlets 7 are disposed on the inner surface of the cavity 5 and are connected to the airflow zone 6;

[0010] The miniature pressure sensor 8 is disposed within the airflow zone 6, which communicates with the air inlet 4. There are several miniature pressure sensors 8; each miniature pressure sensor 8 is distributed at equal intervals along the longitudinal direction.

[0011] The anti-adhesion coating 9 is applied to the inner wall surface of the cavity 5. The thickness of the anti-adhesion coating 9 is 45-50 μm. The anti-adhesion coating 9 is applied to the surface of the cavity 5 (excluding the area of ​​the vent 7) using a spray gun. During construction, a micro-positive pressure device is operated simultaneously to prevent the anti-adhesion coating 9 from entering the cavity.

[0012] By controlling the pressure regulating valve 2 set at the output end of the air pump 1, a stable output of inert micro-positive pressure gas is maintained at several air outlets 7 set on the inner surface of the cavity 5.

[0013] Preferably, the plurality of air outlets 7 are radially distributed on the inner surface of the cavity 5. A plurality of air outlets 7 are formed in the middle diameter-changing section of the inner wall of the cavity 5, which completely penetrates the inner wall of the cavity 5 radially and communicates with the airflow zone 6.

[0014] Preferably, the interlayer spacing and radial spacing of the air outlet 7 are equal; the interlayer spacing is the spacing of the air outlet 7 along the generatrix of the frustum in each layer (different inner diameters), and the radial spacing is the spacing of the air outlet 7 on each layer (same inner diameter).

[0015] Preferably, the air outlets 7 are circular with equal size, diameter of 50-75 μm, and spacing of 80-100 μm; this can prevent hydroxyl-butyl rubber with viscosity between 10000-12000 mPa·s from falling into the air outlets 7; the air outlets 7 are arranged in layers to adapt to the changing diameter of the cavity, so as to ensure the uniformity and stability of the micro-positive pressure gas output at each hole.

[0016] Preferably, the pressure regulating valve 2 is located at the output end of the air pump 1.

[0017] Preferably, a seal is provided at the connection between the air pump 1 and the hose 3.

[0018] Preferably, the cavity 5 has a frustum structure, and the cavity 5 is completely enclosed except for the part in contact with the air inlet 4 and several air holes 7.

[0019] Preferably, the connector of the air intake 4 is a pagoda connector with a circular port and three diameters.

[0020] Preferably, the air inlet 4 and the hose 3 are fixed together by a hose clamp; the joint diameter of the air inlet 4 is adapted to the inner diameter of the hose 3.

[0021] Preferably, the air inlet flow rate of the air outlet 7 is 0.01 to 0.07 L / min.

[0022] The working principle of this invention is as follows: When in use, the air pump 1 is turned on, and the inert gas output by the air pump 1 flows through the hose 3, enters the airflow zone 6 inside the cavity 5 through the air inlet 4, and is discharged through the air outlet 7 set on the inner surface of the cavity 5; the miniature pressure sensor 8 set inside the airflow zone 6 monitors the gas pressure at the air outlet 7, and adjusts the flow rate and pressure of the gas output by the air pump 1 through the pressure regulating valve 2 to maintain the gas output at the air outlet 7 in a slightly positive pressure state; the anti-adhesion coating 9 utilizes the special micro-nano structure of the surface and the low surface energy of fluorocarbon materials to greatly reduce the adhesion between colloids such as hydroxyl-butyl rubber and the inner wall of the cavity 5.

[0023] This invention utilizes the longitudinal shear force of the gas blown out of the vent 7 to isolate the colloid from the cavity 5, thereby achieving the purpose of avoiding adhesion.

[0024] This invention combines the anti-adhesion coating 9 with the ingenious structural design of the inner surface of the cavity 5, thereby improving the anti-adhesion effect from both physical and chemical perspectives. It can prevent the adhesion of high-viscosity colloids such as hydroxyl-butyl rubber to the surface of related devices, improve the operational stability and work efficiency of related processes, and has broad application prospects in the field of anti-adhesion.

[0025] The present invention has the following advantages:

[0026] (1) On the one hand, the present invention utilizes the longitudinal shear force of micro-positive pressure gas to isolate the fluid passing through the surface, and on the other hand, it utilizes the extremely low surface energy and special micro-nano structure of the anti-adhesion coating to reduce the contact force between high-viscosity fluids such as hydroxyl-butyl rubber and the surface. The present invention addresses the issue from two perspectives: physical micro-positive pressure and chemical anti-adhesion, which makes the system exhibit an extremely outstanding anti-adhesion effect, solves the thorny problem of propellant adhesion on the surface of devices such as casting hoppers, and improves the operational stability and work efficiency of related processes.

[0027] (2) The present invention significantly improves the utilization rate and service life of the casting equipment and reduces the operating cost of related processes.

[0028] (3) The present invention uses inert gas as the gas source, which will not affect the substance itself or subsequent processes. It has a very broad application prospect in high-viscosity fluids such as propellant casting. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the dual-dimensional synergistic anti-adhesion system involved in this invention;

[0030] Figure 2This is a schematic diagram of the overall structure of the cavity in the dual-dimensional synergistic anti-adhesion system involved in this invention;

[0031] Figure 3 This is a schematic diagram of the longitudinal section of the cavity in the dual-dimensional synergistic anti-adhesion system involved in this invention;

[0032] Figure 4 This is a cross-sectional schematic diagram of the cavity structure in the dual-dimensional synergistic anti-adhesion system involved in this invention;

[0033] Figure 5 This is a comparative schematic diagram of the interface of the cavity inner wall in the dual-dimensional synergistic anti-adhesion system involved in the present invention, showing no air holes, air holes without air blowing, and air holes flowing through hydroxyl-butyl rubber during air blowing.

[0034] Figure 6 This is a schematic diagram comparing the anti-adhesion effects of the dual-dimensional synergistic anti-adhesion system involved in this invention;

[0035] Figure 7 This is a comparison chart of the changes in the anti-adhesion quality of the dual-dimensional synergistic anti-adhesion system involved in this invention;

[0036] Reference numerals: 1-Air pump; 2-Pressure regulating valve; 3-Hose; 4-Air inlet; 5-Cavity; 6-Airflow zone; 7-Air outlet; 8-Miniature pressure sensor; 9-Anti-adhesion coating. Detailed Implementation

[0037] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are merely further illustrations of the present invention, but the scope of protection of the present invention is not limited to the following embodiments. Example

[0038] Reference Figures 1-4 This embodiment provides a dual-dimensional synergistic anti-adhesion system, including: a micro positive pressure device and an anti-adhesion coating 9; wherein, the micro positive pressure device includes an air pump 1, a pressure regulating valve 2, a hose 3, an air inlet 4, a cavity 5, an airflow zone 6, several air outlets 7, and a miniature pressure sensor 8.

[0039] The system uses inert gas—nitrogen—as the gas source. The gas pump 1 is connected to the hose 3, and a seal is provided at the connection. A pressure regulating valve 2 is provided near the output end of the gas pump 1.

[0040] The cavity 5 is customized according to the casting hopper device, and has a structure of a large-diameter straight cylindrical section at the top, a gradually narrowing section in the middle, and a small-diameter straight cylindrical section at the bottom. The inner and outer walls of the cavity 5 are concentric but have different diameters, with an annular airflow zone 6 in between. The diameter of the top part of the outer wall is 37.5 mm and the height is 3.75 mm; the diameter of the bottom part is 18.75 mm and the height is 7.5 mm; the height of the gradually narrowing section in the middle is 35.25 mm. The diameter of the top part of the inner wall is 40.95 mm and the height is 3.75 mm; the diameter of the bottom part is 16.95 mm and the height is 7.5 mm; the height of the gradually narrowing section in the middle is 35.25 mm, and the thickness of both the inner and outer walls is 0.75 mm.

[0041] The air inlet 4 is a three-section pagoda-shaped air inlet, located on one side of the bottom outer wall of the cavity 5, and is connected to the airflow zone 6. The cross-sectional diameter of the air inlet 4 is 7 mm and the wall thickness is 0.75 mm.

[0042] The outer wall surface of the cavity 5 is tightly fitted to the inner surface of the hopper model, and the vent holes 7 are distributed along the circumference of the tapered section in the middle of the inner wall. The inner and outer walls are horizontally connected at the top and bottom. Except for the air inlet 4 and the air outlet 7, the cavity 5 is completely sealed. 958 air outlet holes 7 are evenly distributed on the inner wall of the cavity 5, arranged in 17 layers; the diameter of the circular air outlet holes 7 is 70 μm, and the spacing between each air outlet hole 7 is 100 μm. At normal temperature and pressure (20℃ and 101.325 kPa), the air flow rate near each air outlet hole is approximately 0.02 L / min, and the air flow rate in the airflow zone 6 is approximately 19.4 L / min.

[0043] The hose 3 is connected to the cavity 5 via the air inlet 4, and a hose clamp is provided at the connection. Miniature pressure sensors 8 are installed near the air outlet 7 inside the airflow zone 6, with two miniature pressure sensors 8 distributed in each layer, evenly spaced circumferentially within each layer. An anti-adhesion coating 9 is applied to the inner wall surface of the cavity 5 (except at the air outlet 7). The anti-adhesion coating 9 was purchased from Shaanxi Longlin Nanofiber Materials Technology Co., Ltd., and is applied to the inner wall surface of the cavity 5 using a spray gun, with a thickness of 45–50 μm. A micro-positive pressure device must be used during spraying to prevent the anti-adhesion coating 9 from entering the cavity 5.

[0044] During operation, the gas generated by the air pump 1 is transmitted through the hose 3 and continuously and slowly enters the airflow zone 6 inside the cavity 5 via the air inlet 4. It is then slowly blown out through the air outlet 7 on the inner surface of the cavity 5. This system effectively prevents the surface-flowing colloid from clogging the air outlet 7. To maintain a stable output of inert, slightly positive pressure gas at each air outlet 7, a miniature pressure sensor 8 inside the airflow zone 6 monitors the gas pressure at different locations of the air outlet 7. Based on the pressure value, the pressure regulating valve 2 near the output end of the air pump 1 is adjusted to maintain a slightly positive pressure near the air outlet 7.

[0045] The anti-adhesion coating 9 is laid on the inner wall surface of the cavity 5; the thickness of the anti-adhesion coating 9 is 45-50μm; the anti-adhesion coating 9 is sprayed onto the surface of the cavity 5 (excluding the air outlet 7 area) using a spray gun; during construction, the micro positive pressure device is operated simultaneously to prevent the anti-adhesion coating 9 from entering the cavity.

[0046] The anti-adhesion coating 9, combined with the ingenious structural design and low surface energy of the inner surface of the cavity 5, greatly reduces the adhesion between hydroxyl-butyl rubber and other adhesives and the inner wall of the cavity 5; at the same time, the longitudinal shear force of the gas blown out of the vent 7 isolates the adhesive from the cavity 5, thereby achieving the purpose of avoiding adhesion.

[0047] When the hydroxyl-butyl rubber comes into contact with the anti-adhesion coating 9 on the inner wall surface of the cavity 5, it will be quickly scraped off; the system of the present invention will generate a shear force perpendicular to the wall surface on the flowing colloid, further separating the colloid from the wall surface and promoting the colloid to roll off. The combination of the two exhibits an excellent anti-adhesion effect against high viscosity fluids.

[0048] Figure 5 This is a comparative schematic diagram of the interface between the inner wall of the cavity in the dual-dimensional synergistic anti-adhesion system involved in this invention, showing a cavity with no pores, a cavity with pores but no air blowing, and a cavity with pores and air flowing through the hydroxyl-butyl rubber during air blowing; Figure 5 It can be seen that: when hydroxyl-butyl rubber flows through the inner wall surface of a cavity without pores, a very thin layer of residual adhesive may still adhere to the surface, requiring mechanical force or other methods to remove it from the coating surface; when hydroxyl-butyl rubber flows through the inner wall surface of a cavity with pores but without air blowing, the thin layer of residual adhesive may partially penetrate into the tiny vents on the inner wall surface. Due to the clever distribution design of the vents on the cavity surface and the surface tension of the hydroxyl-butyl rubber, the adhesive will not fall into the vents, but it is still difficult to clean; when hydroxyl-butyl rubber flows through the inner wall surface of a cavity with pores and air blowing, the longitudinal shear force of the inert gas at the vents will separate the adhesive from the surrounding area of ​​the vents. Under the action of cohesion, the adhesive will clump together and flow away, and the coating on the inner wall surface of the cavity can still maintain its integrity and functionality.

[0049] Figure 6 This is a schematic diagram comparing the anti-adhesion effects of the dual-dimensional synergistic anti-adhesion system involved in this invention; Figure 6It can be seen that when hydroxyl-butyl rubber flows through the inner wall surface of a cavity with only a coating, most of the rubber will slowly slide off under the influence of gravity and the low surface energy of the coating, but a very thin layer of rubber will remain on the surface. This part of the rubber will spread relatively evenly on the inner wall surface of the cavity. However, when hydroxyl-butyl rubber flows through the inner wall surface of a cavity with a micro-positive pressure device and a coating that work synergistically, the longitudinal shear force of the inert gas at the vent will separate the rubber from the area around the vent. Larger pieces of rubber will slide off under the influence of gravity, while smaller pieces of rubber will quickly clump together and slide off under the influence of gas shear force and their own cohesive force, and ultimately no hydroxyl-butyl rubber will remain on the surface.

[0050] Figure 7 This is a comparison chart of the anti-adhesion quality changes of the dual-dimensional synergistic anti-adhesion system involved in this invention; 20g of hydroxyl-butyl rubber was poured into a cavity with only a coating, a cavity with a micro-positive pressure device and a coating, respectively; Figure 7 It can be seen that within 0-4 seconds, the hydroxyl-butyl rubber (HBR) in both cavities slid off at a relatively stable speed, and the average sliding speed of the colloid in the cavity with only a coating was significantly lower than that in the cavity with a micro-positive pressure device and a coating. After 4 seconds, the sliding speed of the colloid in both cavities decreased; after 8 seconds, the residual amount of colloid in both the cavity with only a coating and the cavity with a micro-positive pressure device and a coating no longer changed; finally, the residual amount of HBR in the cavity with only a coating was 13g, and the residual amount of HBR in the cavity with a micro-positive pressure device and a coating was 0g.

[0051] This invention combines an anti-adhesion coating with the system, improving the anti-adhesion effect from both physical and chemical perspectives. It can prevent the adhesion of high-viscosity colloids such as hydroxyl-butyl rubber to the surface of related devices, improve the operational stability and efficiency of related processes, and greatly reduce the scrap rate of related equipment. It has broad application prospects in the field of high-viscosity fluids such as propellants.

[0052] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A dual dimensional synergistic anti-tack system characterized in that, include: Micro positive pressure device and anti-adhesion coating (9); wherein, the micro positive pressure device includes an air pump (1), a pressure regulating valve (2), a hose (3), an air inlet (4), a cavity (5), an airflow zone (6), several air outlets (7), and a micro pressure sensor (8); The air inlet (4) is located on one side of the lower end of the cavity (5) and is connected to the air pump (1) through the hose (3); The annular channel formed between the inner and outer walls of the cavity (5) is the airflow zone (6); The plurality of air outlets (7) are disposed on the inner surface of the cavity (5) and communicate with the airflow zone (6); The miniature pressure sensor (8) is disposed in the airflow zone (6), which is connected to the air inlet (4); The anti-adhesion coating (9) is laid on the inner wall surface of the cavity (5) with a thickness of 45-50 μm; The plurality of air outlets (7) are radially distributed on the inner surface of the cavity (5); The interlayer spacing and radial spacing of the air outlet (7) are equal; The air outlet (7) is circular with a diameter of 50-75 μm and a spacing of 80-100 μm; The pressure regulating valve (2) is located at the output end of the air pump (1); A sealing element is provided at the connection between the air pump (1) and the hose (3); The cavity (5) has a frustum structure; The connector of the air inlet (4) is a pagoda connector with a circular port; the air inlet (4) has three diameters. The air inlet (4) and the hose (3) are fixed together by a hose clamp; The air inlet flow rate of the air outlet (7) is 0.01 to 0.07 L / min.

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