Anticorrosive primer for outer surface of airplane and preparation method of anticorrosive primer based on nitrogen protection

Abstract

The invention relates to the technical field of anti-corrosion primers, and provides an airplane outer surface anti-corrosion primer and a nitrogen protection-based anti-corrosion primer preparation method, the primer comprises 40-45 parts of modified phosphosilicate resin, 10-12 parts of a composite curing agent, 18-20 parts of an anti-rust pigment, 4 parts of an auxiliary agent and 25 parts of a solvent. The preparation system integrates a preparation cylinder, a separation mechanism, an auxiliary mechanism and a stirring mechanism, wherein the separation mechanism adopts dynamic centrifugal filtration to remove gt; and the auxiliary mechanism realizes on-line cleaning of the inner wall through spraying of an annular pipe. The preparation method comprises the processes of hybrid resin synthesis, curing agent mixing, pigment coating modification and multistage centrifugal purification. According to the primer, through the synergistic passivation effect of a hybrid resin compact network and the composite pigment, the salt spray resistance and adhesive force are remarkably improved, the preparation efficiency is high, and the impurity content is low. The problems of insufficient corrosion resistance, non-uniform dispersion and production pollution of a traditional coating are solved, and the coating is suitable for long-acting protection in an aviation high-salt-spray environment.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion primers, and particularly relates to an anti-corrosion primer for the outer surface of an aircraft and a preparation method of the anti-corrosion primer based on nitrogen protection. Background Art

[0002] As a core component of the aviation coating system, the anti-corrosion primer for the outer surface of an aircraft plays a key role in isolating the metal matrix from contacting the corrosive medium and inhibiting the process of electrochemical corrosion. In the marine atmospheric environment, the aircraft is long-term exposed to working conditions with high salt fog, high humidity and drastic temperature changes. In traditional epoxy resin-based coatings, there is generally a problem of Cl ion penetration caused by insufficient crosslinking density, and their salt fog resistance is mostly limited to 800 - 1200 hours. More severely, it is difficult for conventional curing systems to balance the flexibility and hardness of the coating, and microcracks are likely to occur during the frequent thermal expansion and contraction of the aircraft, forming corrosion diffusion channels.

[0003] In the prior art, chromate compounds are mostly used as rust-inhibiting pigments. Although they have excellent passivation effects, the ecological toxicity of hexavalent chromium violates the requirements of environmental protection regulations. In recent years, attempts have been made to replace them with environmentally friendly pigments such as zinc phosphate and calcium molybdate, but their single-component protection mechanisms have obvious defects: zinc phosphate only delays corrosion through physical shielding, while molybdate is difficult to form a continuous passivation film at low concentrations. More worthy of attention is that the uniformity of pigment dispersion in the traditional stirring kettle production process is insufficient, resulting in the formation of local galvanic corrosion micro-regions in the coating, greatly weakening the protection efficiency.

[0004] At the preparation process level, there are generally three major technical bottlenecks in existing equipment: (1) The resin synthesis and pigment treatment processes are separated, and multi-stage transfer causes impurity pollution; (2) Centrifugal filtration is an off-line operation, and it is impossible to dynamically remove aggregates with a particle size > 50μm; (3) The reaction vessel lacks an online cleaning function, and the residues on the inner wall cause cross-contamination between batches. These problems directly lead to a decrease in the adhesion grade of the coating and significantly extend the production cycle to more than 6 hours.

[0005] For the mainstream product series of primers in the market, although the compactness is improved by introducing nano-silica, the stability of the construction viscosity deteriorates. These technical defects seriously restrict the long-term protection ability and process controllability of aviation anti-corrosion coatings.

[0006] Based on this, it is urgent to develop a new type of anti-corrosion primer for the outer surface of an aircraft and a preparation method. While ensuring environmental protection, through molecular structure design and equipment innovation, break through the technical bottlenecks of the existing technology in terms of corrosion resistance, adhesion and production efficiency. Summary of the Invention

[0007] To solve the problems in the background art, the present invention provides an anti-corrosion primer for the outer surface of an aircraft, which comprises the following components:

[0008] Modified phosphorus silicate resin: 40 - 45 parts, and the modified phosphorus silicate resin is a hybrid resin formed by the polycondensation of phosphate ester and silane coupling agent under alkaline conditions;

[0009] Composite curing agent: 10 - 12 parts, comprising a mixture of 3 - 5 parts of polyamide curing agent and 5 - 7 parts of isophorone diamine;

[0010] Antirust pigment: 18 - 20 parts, which is a complex of zinc borate and strontium molybdate with a mass ratio of 2:1;

[0011] Auxiliary agent: 4 parts, including 1 - 2 parts of benzotriazole derivative corrosion inhibitor, 1 - 1.5 parts of organic bentonite, and 1 - 1.5 parts of polyether modified silicone leveling agent;

[0012] Solvent: 25 parts, which is a mixed solvent of propylene glycol methyl ether acetate and cyclohexanone, and the volume ratio of propylene glycol methyl ether acetate to cyclohexanone is 3:1.

[0013] A preparation system for the anti - corrosion primer of the outer surface of an aircraft, which includes:

[0014] A preparation cylinder, with two groups of mounting brackets fixedly arranged at the top. A metering mechanism and a feed hopper are arranged on the mounting brackets, and the bottom of the feed hopper is connected to a blanking pipe inside the preparation cylinder; A transfer cylinder, arranged below the preparation cylinder, is used to receive the mixed primer in the preparation cylinder and convey it to the separation mechanism through a pipeline;

[0015] The separation mechanism includes:

[0016] A fixed frame, with support wheels symmetrically arranged at the upper and lower parts of the left and right side frames, and the upper and lower support wheels are distributed in a triangular shape; A separation tank, which is arranged on the fixed frame by rolling through the support wheels, and the tank body is provided with filter holes, and two groups of the filter holes are symmetrically distributed along the axial direction of the separation tank; An outer shell, which is spliced around the separation tank through a second fixing plate, and a cavity is formed between the outer shell and the separation tank; A third motor, fixed on the fixed frame, and the output end is connected to a gear to drive a toothed ring on the outer wall of the separation tank; Screw blades, which are circumferentially distributed on the inner wall of the separation tank; A liquid discharge hopper, arranged at the bottom of the outer shell and connected to the cavity;

[0017] The auxiliary mechanism includes:

[0018] A bearing plate, with mounting plates symmetrically arranged on both sides of the upper end face; A wheel frame, rotatably installed on the mounting plates, and the two side wheel frames are synchronously connected through a connecting shaft, and a locking member is arranged in the middle of the connecting shaft; Vertical frames, symmetrically arranged on the front side of the wheel frame, and the top is rotatably connected to a rotating wheel; A connecting rope, wound around the wheel frame and the rotating wheel; An annular pipe, suspended on the inner wall of the preparation cylinder through the connecting rope, and the outer wall is provided with annularly distributed nozzles; A connecting pipe, slidably inserted through the top of the preparation cylinder and communicated with the annular pipe;

[0019] The stirring mechanism includes:

[0020] Support rods, symmetrically arranged inside the preparation cylinder; crossbars, fixedly arranged between the two support rods; stirring rods, with the bottom end rotatably connected to the support rods and the upper end rotatably connected to the crossbars; arc-shaped stirring plates, fixedly arranged at the lower end of the stirring rods, with a clearance fit with the inner wall of the preparation cylinder; a first motor, driving the rotation of the stirring rods;

[0021] A control module, jointly controlling the cylinder of the metering mechanism, the second motor of the auxiliary mechanism, the first motor of the stirring mechanism, and the third motor of the separation mechanism.

[0022] Furthermore, the metering mechanism includes:

[0023] A metering bucket, sealed at the top by a bucket cover and provided with an opening and closing plate at the bottom;

[0024] A cylinder, driving the opening and closing of the opening and closing plate through a connecting plate, controlling the raw materials to be put into the preparation cylinder through a feeding pipe;

[0025] A positioning plate, fixing the rotating shaft of the opening and closing plate.

[0026] Furthermore, the distance between the annular pipe of the auxiliary mechanism and the inner wall of the preparation cylinder is 2 - 3 mm, and the connecting rope forms a closed-loop drive with the wheel frame after passing through the rotating wheel, with a lifting speed of 0.1 - 0.5 m / min.

[0027] Furthermore, the edge of the arc-shaped stirring plate of the stirring mechanism is provided with a serrated structure, with a clearance of 3 - 5 mm from the inner wall of the preparation cylinder.

[0028] Furthermore, the clearance between the auger blades of the separation mechanism and the inner wall of the separation tank is 1 - 2 mm, and the filter holes are symmetrically distributed in two groups along the axis of the separation tank, with a pore diameter of 50 μm.

[0029] A method for preparing an anti-corrosion primer for the outer surface of an aircraft, which uses a preparation system and is carried out according to the following steps:

[0030] S1: Put phosphate ester and γ-aminopropyltriethoxysilane into the preparation cylinder according to a molar ratio of 1:1.2, stir at 200 - 300 r / min by the stirring rod of the stirring mechanism, and at the same time dropwise add an alkaline catalyst in portions through the feed hopper; heat up to 80 °C, start the annular pipe and nozzle of the auxiliary mechanism to spray nitrogen for protection on the inner wall of the preparation cylinder; after reacting for 4 hours, centrifuge at 800 r / min through the separation tank of the separation mechanism to remove the unreacted substances, and obtain modified phosphosilicate resin;

[0031] S2: Add polyamide curing agent and isophorone diamine into the transfer cylinder according to a mass ratio of 3:7, start the arc-shaped stirring plate of the stirring mechanism to mix at 150 r / min for 10 minutes, and control the mixing temperature at 25 - 30 °C; drive the opening and closing plate at the bottom of the metering bucket through the cylinder, and transfer the mixed curing agent to the preparation cylinder for temporary storage through the feeding pipe;

[0032] S3: Add zinc borate and strontium molybdate into the separation tank of the separation mechanism at a mass ratio of 2:1. Start the third motor to drive the auger blade to rotate at 1000 r / min, and at the same time inject a 5% silane coupling agent solution through the feed pipe. After centrifugal treatment for 20 minutes, separate the coated and modified rust-inhibiting pigment through the filter holes, and dry it through the drain hopper for standby.

[0033] S4: Put the products of S1 to S3 into the preparation cylinder in proportion. Start the stirring rod of the stirring mechanism to stir at 400 r / min, and at the same time pass 50°C hot air into the annular pipe through the connecting pipe of the auxiliary mechanism. Heat up in stages to 60°C, add a solvent with a volume ratio of 3:1 of propylene glycol methyl ether acetate and cyclohexanone, a benzotriazole derivative corrosion inhibitor and a leveling agent, and stir for 40 minutes. The mixed liquid is pumped into the separation mechanism through the transfer cylinder. Start the separation tank to centrifuge at 1500 r / min for 15 minutes, and remove particles with a particle size > 50 μm through the filter holes to obtain the finished primer.

[0034] Further, the alkaline catalyst in S1 is a tetramethylammonium hydroxide solution, the dropping rate is 0.5 mL per minute, and the gap between the stirring rod and the inner wall of the preparation cylinder is 5 mm.

[0035] Further, the silane coupling agent solution in S3 is injected three times at intervals of 5 minutes, and the gap between the auger blade of the separation tank and the tank body is 2 mm.

[0036] Further, the hot air passing rate in S4 is 10 m³ / h, and the annular pipe of the auxiliary component moves up and down at a speed of 0.2 m / min during the stirring process.

[0037] The beneficial effects achieved by the present invention are as follows:

[0038] First, the present invention adopts a hybrid resin system formed by the polycondensation of phosphate ester and silane coupling agent, breaking through the limitations of traditional epoxy resins. Through the synergistic effect of phosphate groups and siloxanes, this resin forms a dense three-dimensional network structure, significantly improving the corrosion resistance of the coating and the adhesion to the substrate. At the same time, a composite rust-inhibiting pigment of strontium molybdate and zinc borate is introduced, and using the synergistic passivation effect of the two, a double protection barrier is formed on the metal surface, effectively inhibiting the electrochemical corrosion process.

[0039] Second, through the collaborative design of the dynamic centrifugal separation device and the on-line cleaning mechanism, the present invention realizes the continuous operation of raw material reaction, impurity separation and equipment maintenance. The unique arc-shaped stirring structure combined with precise gap control significantly improves the pigment dispersion uniformity; the annular tube type cleaning device adopts a closed-loop drive system to ensure the high-efficiency cleaning of the inner wall of the reaction vessel, greatly reducing the impurity residue.

[0040] III. For key processes such as resin synthesis and pigment treatment, the present invention adopts a process of adding catalysts in stages and centrifugal purification to ensure the high purity of the reaction products. Through a multi-stage coating process of silane coupling agents, a uniform organic modification layer is formed on the surface of the rust-inhibiting pigment, significantly enhancing its interfacial compatibility with the resin matrix.

[0041] IV. The present invention introduces a corrosion inhibition system of benzotriazole derivatives. This additive preferentially accumulates at the metal interface during the coating curing process through the directional adsorption characteristics of its molecular structure, forming a stable chemical adsorption film. Combined with the synergistic effect of polyether-modified silicone leveling agents, precise regulation of the coating surface tension is achieved, effectively eliminating the sagging and cratering defects during the construction process.

[0042] V. The present invention forms a complete process chain through the systematic integration of processes such as modified resin synthesis, composite curing system, and rust-inhibiting pigment treatment. During the resin polycondensation stage, by injecting nitrogen, the oxygen content in the reaction system is significantly reduced, effectively inhibiting the hydrolysis of phosphate esters and the side reaction of silane self-condensation, and the crosslinking degree of the hybrid resin is increased; an innovative coating system with long-term corrosion protection, excellent adhesion, and construction performance is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic structural diagram of a preparation system for an anti-corrosion primer for the outer surface of an aircraft according to the present invention;

[0044] Figure 2 It is a schematic structural diagram of another perspective of a preparation system for an anti-corrosion primer for the outer surface of an aircraft according to the present invention;

[0045] Figure 3 It is a schematic structural diagram of the metering mechanism in the present invention;

[0046] Figure 4 It is a sectional view of the preparation cylinder in the present invention;

[0047] Figure 5 It is a schematic structural diagram of the auxiliary mechanism in the present invention;

[0048] Figure 6 It is a schematic structural diagram of another perspective of the auxiliary mechanism in the present invention;

[0049] Figure 7 It is a schematic structural diagram of the auxiliary component in the present invention;

[0050] Figure 8 It is a schematic structural diagram of the separation mechanism in the present invention;

[0051] Figure 9 It is a schematic structural diagram of another perspective of the separation mechanism in the present invention;

[0052] Figure 10 It is a sectional view of the separation tank in the present invention.

[0053] Figure 11 This is a flowchart of the preparation method of the anti-corrosion primer for the outer surface of an aircraft according to the present invention.

[0054] Reference numerals in the figure:

[0055] 1. Preparation cylinder; 2. Mounting frame; 3. Feed hopper;

[0056] 4. Metering mechanism; 401. Metering barrel; 402. Fixed seat; 403. Fixed rod; 404. Connecting sleeve; 405. Barrel cover; 406. Handle; 407. First fixing plate; 408. Cylinder; 409. Positioning plate; 410. Opening and closing plate; 411. Connecting plate;

[0057] 5. Discharge pipe;

[0058] 6. Transfer cylinder;

[0059] 7. Separation mechanism; 701. Fixed frame; 702. Separation tank; 703. Outer shell; 704. Feed pipe; 705. Discharge pipe; 706. Second fixing plate; 707. Tooth ring; 708. Support wheel; 709. Third motor; 710. Gear; 711. Screw blade; 712. Filter hole; 713. Drain hopper;

[0060] 8. Auxiliary mechanism; 801. Bearing plate; 802. Mounting plate; 803. Wheel frame; 804. Connecting shaft; 805. Locking part; 806. Connecting rope; 807. Upright frame; 808. Rotating wheel; 809. Auxiliary component; 8091. Annular pipe; 8092. Connecting pipe; 8093. Nozzle; 810. Second motor;

[0061] 901. Support rod; 902. Cross bar; 903. Stirring rod; 904. Arc-shaped stirring plate; 905. First motor;

[0062] 10. Support frame. Detailed implementation manners

[0063] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. In addition, the forms of each structure described in the following embodiments are merely examples, and the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0064] The present invention provides an anti-corrosion primer for the outer surface of an aircraft, which includes the following components:

[0065] Modified phosphosilicate resin: 40 - 45 parts, the modified phosphosilicate resin is a hybrid resin formed by the polycondensation of phosphate ester and silane coupling agent under alkaline conditions; Composite curing agent: 10 - 12 parts, comprising a mixture of 3 - 5 parts of polyamide curing agent and 5 - 7 parts of isophorone diamine; Antirust pigment: 18 - 20 parts, which is a complex of zinc borate and strontium molybdate with a mass ratio of 2:1; Auxiliary agent: 4 parts, including 1 - 2 parts of benzotriazole derivative corrosion inhibitor, 1 - 1.5 parts of organic bentonite and 1 - 1.5 parts of polyether modified silicone leveling agent; Solvent: 25 parts, which is a mixed solvent of propylene glycol methyl ether acetate and cyclohexanone, and the volume ratio of propylene glycol methyl ether acetate to cyclohexanone is 3:1.

[0066] In the formula of this anticorrosive primer, 35 - 45 parts of modified phosphosilicate resin is composed of phosphate ester and silane coupling agent , polycondensed to form a hybrid network containing bonds, with both the corrosion resistance of phosphate ester and the strong adhesion of silane; 8 - 12 parts of composite curing agent adopts the polyamide long-chain - - structure and isophorone diamine , compounded. The former provides flexibility, and the latter accelerates cross-linking through primary amine groups - to balance the toughness of the coating and the curing efficiency; 15 - 20 parts of antirust pigment selects zinc borate and strontium molybdate compounded at a ratio of 2:1. Borate inhibits anodic corrosion, and molybdate passivates the metal surface, synergistically blocking erosion; In 3 - 5 parts of auxiliary agent, benzotriazole derivatives such as , form a protective film through atom adsorption. The montmorillonite layered structure of organic bentonite prevents pigment sedimentation, and polyether modified silicones such as reduce the surface tension to ensure leveling; 20 - 30 parts of solvent adopts propylene glycol methyl ether acetate , and cyclohexanone mixed at a ratio of 3:1. The former has fast volatility to ensure workability, and the latter has high solubility to stabilize the resin system. This formula realizes the synergistic effect of salt spray resistance > 3000 hours and adhesion grade 0 through the dense network of hybrid resin, composite passivation mechanism and precise process control.

[0067] The above anticorrosive primer for the outer surface of the aircraft adopts the following preparation system, including:

[0068] Preparation cylinder 1, with two groups of mounting brackets 2 fixedly arranged at the top. A metering mechanism 4 and a feed hopper 3 are arranged on the mounting brackets 2. The bottom of the feed hopper 3 is communicated with a feed pipe 5 inside the preparation cylinder 1; Transfer cylinder 6, arranged below the preparation cylinder 1, used to receive the mixed primer in the preparation cylinder 1 and convey it to the separation mechanism 7 through a pipeline;

[0069] The separation mechanism 7 includes:

[0070] Fixed frame 701, with support wheels 708 symmetrically arranged at the upper and lower parts of the left and right side frames. The upper and lower support wheels 708 are distributed in a triangular shape; Separation tank 702, rolling on the fixed frame 701 through the support wheels 708. The tank body is provided with filter holes 712, and the filter holes 712 are symmetrically distributed in two groups along the axial direction of the separation tank 702; Outer shell 703, spliced around the separation tank 702 through a second fixing plate 706, forming a cavity with the separation tank 702; Third motor 709, fixed on the fixed frame 701, and the output end is connected to a gear 710 to drive a toothed ring 707 on the outer wall of the separation tank 702; Screw blades 711, circumferentially distributed on the inner wall of the separation tank 702; Drain hopper 713, arranged at the bottom of the outer shell 703, communicated with the cavity;

[0071] The auxiliary mechanism 8 includes:

[0072] Carrier plate 801, with mounting plates 802 symmetrically arranged on both sides of the upper end face; Wheel frame 803, rotatably installed on the mounting plates 802. The two side wheel frames 803 are synchronously connected through a connecting shaft 804, and a locking member 805 is arranged in the middle of the connecting shaft 804; Vertical frame 807, symmetrically arranged on the front side of the wheel frame 803, and the top is rotatably connected to a rotating wheel 808; Connecting rope 806, wound around the wheel frame 803 and the rotating wheel 808; Annular pipe 8091, suspended on the inner wall of the preparation cylinder 1 through the connecting rope 806, and the outer wall is provided with nozzles 8093 distributed in a ring shape; Connecting pipe 8092, slidably inserted through the top end of the preparation cylinder 1 and communicated with the annular pipe 8091;

[0073] The stirring mechanism includes:

[0074] Support rods 901, symmetrically arranged inside the preparation cylinder 1; Cross bar 902, fixedly arranged between the two side support rods 901; Stirring rods 903, the bottom ends are rotatably connected to the support rods 901, and the upper ends are rotatably connected to the cross bar 902; Arc-shaped stirring plates 904, fixedly arranged at the lower ends of the stirring rods 903, and in clearance fit with the inner wall of the preparation cylinder 1; First motor 905, driving the stirring rods 903 to rotate;

[0075] The control module is linked to control the cylinder 408 of the metering mechanism 4, the second motor 810 of the auxiliary mechanism 8, the first motor 905 of the stirring mechanism, and the third motor 709 of the separation mechanism 7.

[0076] The metering mechanism 4 includes:

[0077] The metering barrel 401 is sealed at the top by a barrel cover 405 and is provided with an opening and closing plate 410 at the bottom;

[0078] A cylinder 408 drives the opening and closing of the opening and closing plate 410 through a connecting plate 411 to control the raw material to be put into the preparation cylinder 1 through the feeding pipe 5;

[0079] A positioning plate 409 fixes the rotating shaft of the opening and closing plate 410.

[0080] The distance between the annular pipe 8091 of the auxiliary mechanism 8 and the inner wall of the preparation cylinder 1 is 2 - 3 mm, and the connecting rope 806 forms a closed-loop drive with the wheel frame 803 after passing around the rotating wheel 808, and the lifting speed is 0.1 - 0.5 m / min.

[0081] The edge of the arc-shaped stirring plate 904 of the stirring mechanism is provided with a serrated structure, and the gap with the inner wall of the preparation cylinder 1 is 3 - 5 mm.

[0082] The gap between the auger blade 711 of the separation mechanism 7 and the inner wall of the separation tank 702 is 1 - 2 mm, and the filter holes 712 are symmetrically distributed in two groups along the axial direction of the separation tank 702, and the pore diameter is 50 μm.

[0083] In a preferred embodiment, two sets of mounting brackets 2 are fixedly installed at the top of the preparation cylinder 1. A metering mechanism 4 is provided at the top of the two sets of mounting brackets 2. An inlet hopper 3 is provided inside the middle of the mounting bracket 2. A feeding pipe 5 communicating with the inside of the preparation cylinder 1 is provided at the bottom of the inlet hopper 3. A transfer cylinder 6 is arranged below the preparation cylinder 1. A separation mechanism 7 is located beside the preparation cylinder 1 and is connected to the transfer cylinder 6. The separation mechanism 7 is used to remove particulate impurities in the primer. An auxiliary mechanism 8 is arranged at the top of the preparation cylinder 1 and is used to clean the inner wall of the preparation cylinder 1. A stirring mechanism is arranged inside the preparation cylinder 1, and the bottom of the preparation cylinder 1 is fixed by the provided support frame 10.

[0084] In another embodiment provided by the present invention, as Figure 3 shown, the metering mechanism 4 includes a metering barrel 401. The metering barrel 401 is arranged at the top of the mounting bracket 2. A fixed seat 402 is provided on the outer side of the metering barrel 401. A fixed rod 403 is vertically provided on the fixed seat 402. The outer part of the fixed rod 403 is connected to the barrel cover 405 at the top of the metering barrel 401 through a rotatably connected connecting sleeve 404. A handle 406 connected to the barrel cover 405 is provided at the top of the metering barrel 401 on the opposite side of the fixed seat 402.

[0085] Further, the metering mechanism 4 further includes a first fixing plate 407 disposed outside the metering barrel 401, and the first fixing plate 407 is correspondingly disposed outside the metering barrel 401. A cylinder 408 with a downward direction is disposed on the first fixing plate 407. A positioning plate 409 is correspondingly disposed directly below the first fixing plate 407 outside the metering barrel 401. A side plate extending outward from the positioning plate 409 is movably connected to an opening and closing plate 410 provided at the bottom of the metering barrel 401. A connecting plate 411 is provided in the middle of the side portion of the opening and closing plate 410, and one side of the connecting plate 411 away from the opening and closing plate 410 is movably connected to the output end of the cylinder 408.

[0086] Specifically, when it is necessary to input the raw material ratio into the preparation cylinder 1, the operator first opens the bucket cover 405 through the handle 406, adds raw materials into the set metering barrel 401, then closes the bucket cover 405, and starts the cylinder 408. The extending end of the cylinder 408 pushes the connecting plate 411, and then drives the opening and closing plate 410 to rotate around its movable connection point, so that the opening and closing plate 410 is opened. At this time, the raw materials in the metering barrel 401 fall into the lower preparation cylinder 1 through the feeding pipe 5 under the action of gravity. When the raw material feeding is completed, the cylinder 408 retracts, driving the opening and closing plate 410 to close, thus completing a metering and feeding process.

[0087] It should be further noted that through the designed size of the metering barrel 401, the raw materials are directionally put in each time, and metering barrels 401 with different weights are respectively equipped for different raw material ratios, so as to accurately measure the raw material ratio.

[0088] In another embodiment provided by the present invention, as Figures 5 - 7 shown, the auxiliary mechanism 8 includes a bearing plate 801, a mounting plate 802, a wheel frame 803, a connecting shaft 804, a locking member 805, a connecting rope 806, a vertical frame 807, a rotating wheel 808 and an auxiliary assembly 809. Mounting plates 802 are symmetrically provided on both sides of the upper end surface of the bearing plate 801. Wheel frames 803 are rotatably mounted on both mounting plates 802. The connecting rope 806 is wound around the outside of the wheel frame 803. A connecting shaft 804 is fixedly connected between the opposite side portions of the two wheel frames 803. A locking member 805 is provided in the middle of the connecting shaft 804. The vertical frame 807 is symmetrically provided with respect to the bearing plate 801 on the front side of the wheel frame 803. Rotating wheels 808 are rotatably connected to the tops of the two vertical frames 807. One ends of the two connecting ropes 806 away from the wheel frame 803 are wound through the rotating wheels 808 and fixedly connected to the auxiliary assembly 809.

[0089] Further, the auxiliary component 809 includes an annular tube 8091, a connecting tube 8092, and a nozzle 8093. The annular tube 8091 is slidably disposed on the inner wall of the preparation cylinder 1, and the upper end surface of the annular tube 8091 is fixedly connected to the connecting rope 806. One end of the connecting tube 8092 is slidably inserted and connected to the top end of the preparation cylinder 1, and the other end of the connecting tube 8092 is fixedly connected to the annular tube 8091. A plurality of nozzles 8093 are fixedly installed on the outer wall of the annular tube 8091 at equal intervals, and the plurality of nozzles 8093 are arranged in a ring shape.

[0090] Specifically, when it is necessary to control the up and down movement of the auxiliary component 809, the second motor 810 drives the wheel frame 803 to rotate. Since the connecting shaft 804 synchronously connects the two side wheel frames 803, the two side wheel frames 803 will rotate at the same speed and in the same direction, thereby taking in and releasing the connecting rope 806. As the wheel frame 803 rotates, the connecting rope 806 will bypass the rotating wheel 808 and move up and down along the path of the vertical frame 807. One end of the connecting rope 806 is fixed on the wheel frame 803, and the other end is connected to the auxiliary component 809. Therefore, the taking in and releasing of the connecting rope 806 will drive the up and down movement of the auxiliary component 809 on the inner wall of the preparation cylinder 1. The setting of the rotating wheel 808 plays a role in supporting the connecting rope 806, thereby avoiding friction between the connecting rope 806 and the preparation cylinder 1 and extending the service life of the connecting rope 806. When cleaning is required, the second motor 810 drives the wheel frame 803 to take in and release the connecting rope 806, so that the auxiliary component 809 moves up and down on the inner wall of the preparation cylinder 1. After the connecting tube 8092 is connected to an external water source, the inner wall of the preparation cylinder 1 can be directly cleaned in all directions through the plurality of nozzles 8093. By cooperating with the taking in and releasing of the connecting rope 806, the annular tube 8091 can clean each depth of the inner wall of the preparation cylinder 1, ensuring that all parts of the inner wall can be fully flushed, so that the cleaning can be more thorough. When the auxiliary component 809 does not need to be moved, the relative positions of the connecting shaft 804 and the wheel frame 803 can be locked by the locking member 805 to prevent the wheel frame 803 from rotating by itself, thereby ensuring the stability of the auxiliary component 809.

[0091] Among them, it should be specifically noted that since the preparation cylinder 1 is in a cavity state during cleaning, one end of the connecting tube 8092 is connected to an external water pipe. As the annular tube 8091 is lowered, the external water pipe will also follow. And the annular tube 8091 is slidably disposed on the inner wall of the preparation cylinder 1. Since the annular tube 8091 has a certain wall thickness, and the wall thickness is greater than the reserved distance between the annular tube 8091 and the inner wall of the preparation cylinder 1, there is no state that affects the horizontal lifting of the annular tube 8091.

[0092] In another embodiment provided by the present invention, as Figure 4As shown in the figure, the stirring mechanism includes a support rod 901, a cross bar 902, and a stirring rod 903. Inside the preparation cylinder 1, support rods 901 are symmetrically arranged. A cross bar 902 is fixedly arranged between the two support rods 901 on both sides. The bottom end of the support rod 901 is rotatably connected to a stirring rod 903. The upper end of the stirring rod 903 is rotatably connected to the cross bar 902. An arc-shaped stirring plate 904 is fixedly arranged at the lower end of the stirring rod 903. Both the stirring rod 903 and the arc-shaped stirring plate 904 are in clearance fit with the inner wall of the preparation cylinder 1.

[0093] Specifically, the first motor 905 drives the stirring rod 903 to rotate, so that the arc-shaped stirring plate 904 rotates following the stirring rod 903, and the stirring rod 903 rotates along the support rod 901 and the cross bar 902 to stir the solution inside the preparation cylinder 1. After the stirring is completed, it is transported to the inside of the transfer cylinder 6 through the liquid outlet, and then transported to the separation mechanism 7 through the transfer cylinder 6.

[0094] In another embodiment provided by the present invention, as Figures 8 - 10 shown, the separation mechanism 7 includes a fixing frame 701, a separation tank 702, a housing 703, a feed pipe 704, a discharge pipe 705, a second fixing plate 706, a toothed ring 707, a support wheel 708, a third motor 709, a gear 710, a screw blade 711, and a filter hole 712. Support wheels 708 are symmetrically arranged at the upper and lower parts of the left and right side frames of the fixing frame 701. The upper and lower support wheels 708 are distributed in a triangular shape. A separation tank 702 is rotatably installed inside the two support wheels 708 on both sides. The housing 703 is spliced around the separation tank 702 through the second fixing plate 706. A feed pipe 704 and a discharge pipe 705 are correspondingly arranged on the left and right sides of the separation tank 702. A toothed ring 707 is arranged on the outer wall of the separation tank 702 near the feed pipe 704. A third motor 709 is fixedly installed on the fixing frame 701. The output end of the third motor 709 is fixedly connected to a gear 710. Screw blades 711 are circumferentially distributed on the inner wall of the separation tank 702. Filter holes 712 are arranged on the tank body of the separation tank 702, and two groups of filter holes 712 are symmetrically distributed about the axis of the separation tank 702. A cavity is reserved between the separation tank 702 and the housing 703. A drain hopper 713 communicating with the cavity is arranged at the bottom of the housing 703.

[0095] Specifically, after the primer in the preparation cylinder 1 is mixed, the primer enters the separation tank 702 through the feed pipe 704. When the separation tank 702 is driven by the third motor 709 to rotate the gear 710, the gear 710 drives the toothed ring 707 to rotate, thereby driving the separation tank 702 to rotate. The auger blade 711 rotates accordingly, applying a centrifugal force to the mixture in the tank. As the auger blade 711 rotates, the primer begins to flow out through the filter holes 712 distributed on the body of the separation tank 702 and enters the cavity reserved between the separation tank 702 and the outer shell 703. This cavity provides a temporary storage space for the primer and guides it to the drain hopper 713. At the same time, the solid particle impurities in the primer are separated. After the primer is discharged, the particle impurities are discharged through the discharge pipe 705, realizing the effective separation of the particle impurities and the primer.

[0096] In another embodiment provided by the present invention, the operator first opens the lid 405 of the metering barrel 401 through the handle 406, adds the required raw materials into the set metering barrel 401. Each raw material uses a metering barrel 401 with a corresponding weight and size to ensure accurate proportioning. Then, the lid 405 is closed, and the cylinder 408 is started. The extending end of the cylinder 408 pushes the connecting plate 411, driving the opening and closing plate 410 to rotate around its movable connection point to open. The raw materials fall into the preparation cylinder 1 through the feeding pipe 5 under the action of gravity. After the raw materials are put in, the cylinder 408 retracts, driving the opening and closing plate 410 to close, completing a metering and feeding process. After all the raw materials are put into the preparation cylinder 1 according to the proportion, the first motor 905 of the stirring mechanism is started. The first motor 905 drives the stirring rod 903 to rotate, and the arc-shaped stirring plate 904 rotates inside the preparation cylinder 1 following the stirring rod 903 to fully mix the primer. When the primer mixing is completed, the second motor 810 of the auxiliary mechanism 8 is started. The second motor 810 drives the wheel frame 803 to rotate, winds and unwinds the connecting rope 806, driving the auxiliary component 809 to move up and down on the inner wall of the preparation cylinder 1. The auxiliary component 809 includes an annular pipe 8091, a connecting pipe 8092 and a nozzle 8093. The connecting pipe 8092 is connected to an external water source, and the inner wall of the preparation cylinder 1 is cleaned through the nozzle 8093. After the cleaning is completed, the second motor 810 is stopped, and the relative positions of the connecting shaft 804 and the wheel frame 803 are locked through the locking member 805 to maintain the stability of the auxiliary component 809. The mixed and cleaned primer passes through the liquid outlet at the bottom of the preparation cylinder 1 and enters the transfer cylinder 6. The primer enters the separation tank 702 of the separation mechanism 7 from the transfer cylinder 6 through the feed pipe 704. The third motor 709 is started to drive the gear 710 to rotate. The gear 710 drives the toothed ring 707 and the separation tank 702 to rotate. As the separation tank 702 rotates, the auger blade 711 applies a centrifugal force to the primer in the tank. The primer flows out through the filter holes 712 to the cavity between the separation tank 702 and the outer shell 703. The primer flows to the drain hopper 713 and is discharged in the cavity, and at the same time, the solid particle impurities are separated, and the impurities are discharged through the discharge pipe 705.

[0097] The present invention provides a preparation method for an anti-corrosion primer for the outer surface of an aircraft. Using the above-mentioned preparation system, the method is carried out according to the following steps:

[0098] S1: Put the phosphate ester and γ-aminopropyltriethoxysilane into the preparation cylinder 1 at a molar ratio of 1:1.2, stir with the stirring rod 903 of the stirring mechanism at 200 - 300 r / min, and at the same time dropwise add the alkaline catalyst in three portions through the feed hopper 3; heat up to 80 °C, start the annular tube 8091 and the nozzle 8093 of the auxiliary mechanism 8 to spray nitrogen gas to protect the inner wall of the preparation cylinder 1. After reacting for 4 hours, centrifuge at 800 r / min with the separation tank 702 of the separation mechanism 7 to remove the unreacted substances, and obtain the modified phosphosilicate resin;

[0099] S2: Add the polyamide curing agent and isophorone diamine into the transfer cylinder 6 at a mass ratio of 3:7, start the arc-shaped stirring plate 904 of the stirring mechanism to mix at 150 r / min for 10 minutes, and control the mixing temperature at 25 - 30 °C; drive the opening and closing plate 410 at the bottom of the metering barrel 401 through the cylinder 408, and transfer the mixed curing agent to the preparation cylinder 1 for temporary storage through the feeding pipe 5;

[0100] S3: Add zinc borate and strontium molybdate into the separation tank 702 of the separation mechanism 7 at a mass ratio of 2:1, start the third motor 709 to drive the auger blade 711 to rotate at 1000 r / min, and at the same time inject a 5% silane coupling agent solution through the feed pipe 704; after centrifugal treatment for 20 minutes, separate the coated and modified anti-rust pigment through the filter holes 712, and dry it through the drain hopper 713 for standby;

[0101] S4: Put the products of S1 to S3 into the preparation cylinder 1 in proportion, start the stirring rod 903 of the stirring mechanism to stir at 400 r / min, and at the same time pass hot air at 50 °C into the annular tube 8091 through the connecting pipe 8092 of the auxiliary mechanism 8; heat up to 60 °C in stages, add a solvent with a volume ratio of 3:1 of propylene glycol monomethyl ether acetate and cyclohexanone, a benzotriazole derivative corrosion inhibitor and a leveling agent, and stir for 40 minutes; pump the mixed liquid into the separation mechanism 7 through the transfer cylinder 6, start the separation tank 702 to centrifuge at 1500 r / min for 15 minutes, and remove particles with a particle size > 50 μm through the filter holes 712 to obtain the finished primer.

[0102] The alkaline catalyst described in S1 is a tetramethylammonium hydroxide solution, the dropping rate is 0.5 mL per minute, and the gap between the stirring rod 903 and the inner wall of the preparation cylinder 1 is 5 mm. The silane coupling agent solution in S3 is injected in three portions, with an interval of 5 minutes each time, and the gap between the auger blade 711 of the separation tank 702 and the tank body is 2 mm. The hot air passing rate in S4 is 10 m³ / h, and the annular tube 8091 of the auxiliary component 809 moves up and down at a speed of 0.2 m / min during the stirring process.

[0103] Example 1. In this example, the following components are selected:

[0104] 40 parts of modified phosphosilicate resin (phosphate ester: γ-aminopropyltriethoxysilane = 1:1.2);

[0105] 10 parts of composite curing agent (polyamide: isophorone diamine = 4:6);

[0106] 18 parts of anti-rust pigment (zinc borate: strontium molybdate = 2:1);

[0107] 4 parts of additives (1.5 parts of benzotriazole + 1.2 parts of bentonite + 1.3 parts of leveling agent);

[0108] 25 parts of solvent (propylene glycol methyl ether acetate: cyclohexanone = 3:1);

[0109] Main parameters of the preparation system: stirring gap 5 mm, centrifugal speed 1500 r / min, auger blade gap 2 mm;

[0110] The process is prepared according to the above steps S1-S4. The resin polycondensation temperature is 80 °C, the centrifugal filtration pore size is 50 μm, and the hot air rate is 10 m³ / h; the nitrogen flow rate is 5 L / min, and the replacement time is 10 min;

[0111] Example 2. Formula: 45 parts of resin, 12 parts of curing agent, 20 parts of anti-rust pigment (the others are the same as in Example 1);

[0112] Main parameters of the preparation system are the same as in Example 1; Process: The resin polycondensation temperature is increased to 85 °C, and the others are the same as in Example 1.

[0113] Example 3. Formula: The same as in Example 1; Preparation system: The same as in Example 1.

[0114] Process: In the S4 stage, the centrifugal speed is increased to 1800 r / min; the hot air rate is increased to 15 m³ / h

[0115] Comparative Example 1. A traditional epoxy resin system is adopted. Formula: Replace the modified phosphosilicate resin with 40 parts of bisphenol A epoxy resin; the curing agent uses 10 parts of single polyamide (isophorone diamine is cancelled); the anti-rust pigment is 18 parts of single strontium molybdate; the additives and solvent are the same as in Example 1; Preparation system: Commercially available conventional stirring kettle + off-line centrifuge; Process: There is no on-line cleaning, and manual transfer is required after centrifugation.

[0116] Comparative Example 2. There is no composite anti-rust pigment. Formula: The anti-rust pigment is replaced with 18 parts of zinc phosphate (single component); the others are the same as in Example 1; Preparation system and process: The same as in Example 1;

[0117] Comparative Example 3. Simplify the preparation system, and the formula is the same as in Example 1;

[0118] The separation mechanism 7 of the preparation system was cancelled, and conventional stirring and filtration were adopted; the auxiliary mechanism 8 was changed to manual spray gun cleaning; Process: There is no dynamic centrifugation step, and after mixing, it is left to stand for precipitation;

[0119] Comparative Example 4, formulation: the same as Example 1; preparation system: the same as Example 1; Process: The centrifugation speed in S4 was reduced to 800 r / min;

[0120] The hot air rate was reduced to 5 m³ / h;

[0121] Experimental methods, sample preparation procedures and detection steps for each index:

[0122] I. Salt spray resistance time (ASTM B117); Sample preparation: The primer paints obtained from the examples and comparative examples were evenly sprayed on Q235 cold-rolled steel plates treated by sandblasting (Sa2.5 level), and the wet film thickness was controlled at 20 ± 2 μm. After curing at 25°C for 7 days, a complete coating was formed. 6 samples (size 150 mm × 70 mm × 1 mm) were prepared for each group.

[0123] Test method: The samples were placed in a salt spray chamber at an inclination angle of 20°, and a 5% NaCl solution (pH = 6.5 - 7.2, 35 ± 1°C) was continuously sprayed. Check once every 24 hours. Record the time when the substrate first shows rust or blisters (area ≥ 1 mm²) on the coating, and take the median value of the 6 samples as the final result.

[0124] II. Adhesion grade (ISO 2409 cross-cut method); Sample preparation: Select the cured coating samples, and after the surface is cleaned and dried, place them in a constant temperature and humidity environment (23 ± 2°C, 50 ± 5% RH) to equilibrate for 24 hours.

[0125] Test method: Use a six-edge cutting knife (blade distance 1 mm) to draw an 11×11 grid on the coating surface, cutting into the substrate to a depth of 0.1 mm. Use a pressure-sensitive tape (3M 600 type) to closely adhere to the scratched area, and quickly peel it off at a 90° angle after 60 seconds. Rate according to the ISO standard: Grade 0 (no peeling), Grade 1 (≤5% peeling) to Grade 5 (>65% peeling), and take the highest grade of 3 parallel tests for each group.

[0126] III. Impurity content (GB / T 1725 - 2007); Sample treatment: Take 10.00 g of the finished primer paint (accurate to 0.1 mg) and dissolve it in 50 mL of propylene glycol monomethyl ether acetate, and ultrasonically disperse it for 10 minutes.

[0127] Detection method: Vacuum filter the solution through a polytetrafluoroethylene filter membrane with a pore size of 5 μm, wash the filter residue 3 times with absolute ethanol, and dry it at 105°C to constant weight. Impurity content calculation formula:

[0128]

[0129] Each group of tests was repeated 3 times and the average value was taken.

[0130] IV. Pigment dispersion uniformity D90; Sample preparation: Take 0.5 g of primer and add 50 mL of deionized water, and ultrasonically disperse for 5 minutes to form a suspension (light shielding rate 12 - 15%).

[0131] Detection method: Use a Malvern Mastersizer 3000 laser particle size analyzer (Hydro LV wet module), set the refractive index to 1.52 (resin) / 1.67 (pigment), measure 3 times and take the D90 value (90% of the particle size is less than this value), and allow the relative standard deviation ≤ 3%.

[0132] V. Production cycle efficiency; Data collection: Record the full process time from raw material feeding, mixing, centrifugation to finished product packaging. Compare the average production cycle of 10 batches of the traditional process (offline centrifugation + manual transfer), and calculate the percentage of efficiency improvement:

[0133]

[0134] VI. Viscosity stability; Sample treatment: Place the primer in a constant temperature water bath at 25 ± 0.5 °C and equilibrate for 1 hour.

[0135] Test method: Use a calibrated viscosity cup (aperture 4 ± 0.02 mm), fill it with paint, open the bottom hole, and record the outflow time until the continuous liquid flow is interrupted. Repeat 3 times and calculate the standard deviation:

[0136]

[0137] where is the single test value, is the average value, and the instrument error is allowed to be ≤ ±0.5 s.

[0138] All metal substrates were degreased with acetone and then sandblasted (roughness Ra = 3.2 ± 0.3 μm), and the spraying parameters were fixed (spray gun aperture 1.3 mm, pressure 0.4 MPa). The tests were all completed in an ISO 17025 - certified laboratory, and the temperature and humidity met the requirements of GB / T 9278 - 2008 (23 ± 2 °C, 50 ± 5% RH). Each group of experiments contained 3 parallel samples, and the median value was reported after excluding outliers.

[0139] Table 1 - Experimental results of examples and comparative examples Experimental indicators Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Salt spray resistance time (h) 3200 3100 3300 800 1200 1800 1500 Adhesion grade Grade 0 Grade 0 Grade 0 Grade 2 Grade 1 Grade 1 Grade 1 Impurity content (%) 0.003 0.004 0.002 0.05 0.008 0.12 0.06 D90 (μm) 12 14 10 25 18 30 22 Production cycle (h) 3.5 3.8 3.2 6.0 4.0 5.5 4.8 Viscosity error (s) ±1.5 ±2.0 ±1.0 ±8 ±5 ±10 ±6

[0140] Example 1 was subjected to a 3200 - hour salt spray test. The sample did not blister, wrinkle, crack, or peel, and only had slight discoloration, which was greatly improved compared to Comparative Example 1, indicating that the dense network structure of the phosphate - silane hybrid resin effectively blocked Erosion. The adhesion of Example 1 reached level 0, while that of Comparative Example 1 was only level 2, proving that the hybrid resin enhanced the chemical bonding between the coating and the metal matrix through Si-O-P bonds. The D90 of Example 1 decreased by 33% compared with Comparative Example 2, and the salt spray resistance time increased significantly, indicating that the composite passivation mechanism of zinc borate and strontium molybdate significantly optimized the pigment dispersion and the synergistic rust prevention effect. The impurity content of Example 1 decreased by 62.5% compared with Comparative Example 2, indicating that the composite pigment reduced agglomeration through silane coupling agent coating. The production cycle of Example 1 was shortened by 41.7% compared with Comparative Example 1 and by 36% compared with Comparative Example 3, proving that system integration significantly improved the efficiency. The salt spray resistance time of Example 3 was significantly higher than that of Comparative Example 4, and D10 was better, indicating that high-speed centrifugation enhanced impurity separation and pigment dispersion. The viscosity error of Example 1 decreased by 75% compared with Comparative Example 4, proving that hot air online drying at 50 °C effectively stabilized the solvent evaporation rate. The adhesion of Example 1 was level 0, while that of Comparative Example 2 was level 1, verifying that benzotriazole enhanced the interfacial binding force and corrosion inhibition effect through the directional adsorption of N atoms at the resin-metal interface. The impurity content of Example 1 decreased by 95% compared with Comparative Example 4, proving that the clearance between the auger blades was a necessary condition for the efficient operation of dynamic centrifugation. The stirring clearance of Example 1 was 5 mm, which was 60% more optimized than that of Comparative Example 3, indicating that the serrated structure and clearance design of the arc-shaped stirring plate 904 were crucial for pigment dispersion. The comprehensive properties such as salt spray resistance time, adhesion, and impurity content of Example 1 far exceeded those of the comparative examples, verifying that the deep coupling of the formulation and the preparation system was the core of the technical solution, and a single improvement could not achieve the same effect.

[0141] Through the synergistic effect of the modified resin, composite anti-rust pigment, and benzotriazole corrosion inhibitor, combined with the dynamic centrifugation, online cleaning, and precise process parameter control of the preparation system, the present invention achieves a significant improvement in the salt spray resistance performance, adhesion, and production efficiency of the anti-corrosion primer, and the impurity content is far better than the industry standard.

[0142] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-corrosion primer for the outer surface of an aircraft, characterized in that, It includes the following components by weight: Modified phosphosilicate resin: 40-45 parts, wherein the modified phosphosilicate resin is a hybrid resin formed by polycondensation of phosphate ester and silane coupling agent under alkaline conditions; Composite curing agent: 10-12 parts, comprising a mixture of 3-5 parts of polyamide curing agent and 5-7 parts of isophorone diamine; Anti-rust pigment: 18-20 parts, which is a composite of zinc borate and strontium molybdate in a mass ratio of 2:1; Additives: 4 parts, including 1-2 parts of benzotriazole derivative corrosion inhibitor, 1-1.5 parts of organic bentonite and 1-1.5 parts of polyether modified siloxane leveling agent; Solvent: 25 parts, a mixed solvent of propylene glycol methyl ether acetate and cyclohexanone, the volume ratio of propylene glycol methyl ether acetate to cyclohexanone is 3:

1.

2. The preparation system of the anti-corrosion primer for the outer surface of an aircraft according to claim 1, wherein: It includes: The preparation cylinder has two sets of mounting frames fixed on the top, and the mounting frames are provided with a metering mechanism and a feed hopper, and the bottom of the feed hopper is connected to a feed pipe inside the preparation cylinder; The transfer cylinder is arranged below the preparation cylinder and is used to receive the mixed primer from the preparation cylinder and transport it to the separation mechanism through a pipeline; Separation agencies, including: The upper and lower parts of the left and right side frames of the fixed frame are symmetrically provided with support wheels, and the upper and lower support wheels are distributed in a triangular shape; the separation tank is arranged on the fixed frame by the support wheels, and the tank body is provided with filter holes, and the filter holes are symmetrically distributed in two groups along the axis of the separation tank; the outer shell is spliced ​​to the periphery of the separation tank through the second fixed plate, and a cavity is formed between the outer shell and the separation tank; the third motor is fixed on the fixed frame, and the output end is connected to the gear to drive the gear ring on the outer wall of the separation tank; the auger blades are circumferentially distributed on the inner wall of the separation tank; the liquid drain bucket is arranged at the bottom of the outer shell and connected to the cavity; Auxiliary institutions include: The bearing plate has mounting plates symmetrically arranged on both sides of the upper end surface; the wheel frame is rotatably mounted on the mounting plate, and the wheel frames on both sides are synchronously connected through a connecting shaft, and a locking piece is arranged in the middle of the connecting shaft; the vertical frame is symmetrically arranged on the front side of the wheel frame, and the top is rotatably connected to the rotating wheel; the connecting rope is wound around the wheel frame and the rotating wheel; the annular tube is suspended on the inner wall of the preparation cylinder through the connecting rope, and the outer wall is provided with annularly distributed nozzles; the connecting tube is slidably inserted into the top of the preparation cylinder and connected to the annular tube; Stirring mechanism, comprising: The support rods are symmetrically arranged inside the preparation barrel; the cross bar is fixed between the support rods on both sides; the stirring rod has a bottom end rotatably connected to the support rod and an upper end rotatably connected to the cross bar; the arc-shaped stirring plate is fixed at the lower end of the stirring rod and has a clearance fit with the inner wall of the preparation barrel; the first motor drives the stirring rod to rotate; The control module controls the cylinder of the metering mechanism, the second motor of the auxiliary mechanism, the first motor of the stirring mechanism and the third motor of the separation mechanism in a linkage manner.

3. The preparation system according to claim 2, characterized in that: The measuring mechanism comprises: A metering barrel, the top of which is sealed by a barrel cover and the bottom is provided with an opening and closing plate; The cylinder drives the opening and closing of the opening and closing plate through the connecting plate, and controls the raw materials to be put into the preparation cylinder through the feeding pipe; Positioning plate, fixes the rotation axis of the opening and closing plate.

4. The preparation system according to claim 3, characterized in that: The distance between the annular tube of the auxiliary mechanism and the inner wall of the preparation cylinder is 2-3 mm, and the connecting rope is wound around the rotating wheel to form a closed-loop transmission with the wheel frame, and the lifting speed is 0.1-0.5m / min.

5. The preparation system according to claim 4, wherein: The edge of the arc-shaped stirring plate of the stirring mechanism is provided with a serrated structure, and the gap between the arc-shaped stirring plate and the inner wall of the preparation cylinder is 3-5 mm.

6. The preparation system according to claim 5, wherein: The clearance between the auger blade of the separation mechanism and the inner wall of the separation tank is 1-2 mm, and the filter holes are symmetrically distributed in two groups along the axial direction of the separation tank, with a pore diameter of 50 μm.

7. A method for preparing an anti-corrosion primer based on nitrogen protection, characterized in that, It adopts the preparation system described in claim 6 and proceeds according to the following steps: S1: Put the phosphate ester and γ-aminopropyltriethoxysilane into the preparation cylinder at a molar ratio of 1:1.2, stir with the stirring rod of the stirring mechanism at 200-300 r / min, and at the same time dropwise add the alkaline catalyst in portions through the feed hopper; heat up to 80 °C, start the annular pipe and nozzle of the auxiliary mechanism to spray nitrogen for protection on the inner wall of the preparation cylinder, after reacting for 4 hours, centrifuge at 800 r / min with the separation tank of the separation mechanism to remove the unreacted substances, and obtain the modified phosphosilicate resin; S2: Add the polyamide curing agent and isophorone diamine into the transfer cylinder at a mass ratio of 3:7, start the arc-shaped stirring plate of the stirring mechanism to mix at 150 r / min for 10 minutes, and control the mixing temperature at 25-30 °C; drive the opening and closing plate at the bottom of the metering barrel through the cylinder, and transfer the mixed curing agent to the preparation cylinder for temporary storage through the blanking pipe; S3: Add zinc borate and strontium molybdate into the separation tank of the separation mechanism at a mass ratio of 2:1, start the auger blade driven by the third motor to rotate at 1000 r / min, and at the same time inject a 5% silane coupling agent solution through the feed pipe; after centrifuging for 20 minutes, separate the coated and modified anti-rust pigment through the filter holes, and dry it through the drain hopper for standby; S4: Put the products of S1 to S3 into the preparation cylinder in proportion, start the stirring rod of the stirring mechanism to stir at 400 r / min, and at the same time pass hot air at 50 °C into the annular pipe through the connecting pipe of the auxiliary mechanism; heat up to 60 °C in stages, add a solvent with a volume ratio of 3:1 of propylene glycol methyl ether acetate and cyclohexanone, a benzotriazole derivative corrosion inhibitor and a leveling agent, and stir for 40 minutes; pump the mixed solution into the separation mechanism through the transfer cylinder, start the separation tank to centrifuge at 1500 r / min for 15 minutes, and remove the particles with a particle size >50 μm through the filter holes to obtain the finished primer.

8. The preparation method according to claim 7, characterized in that: The alkaline catalyst described in S1 is a tetramethylammonium hydroxide solution, the dropping rate is 0.5 mL per minute, and the clearance between the stirring rod and the inner wall of the preparation cylinder is 5 mm.

9. The preparation method according to claim 7, wherein: The silane coupling agent solution in S3 is injected in three times, with an interval of 5 minutes each time, and the clearance between the auger blade of the separation tank and the tank body is 2 mm.

10. The preparation method according to claim 7, characterized in that: In S4, the hot air passing rate is 10 m³ / h, and the annular pipe of the auxiliary component moves up and down at a speed of 0.2 m / min during the stirring process.

Images