On-site rapid mixing method and reaction equipment for double-component spraying polyurea coating

Abstract

The invention discloses a two-component spraying polyurea coating on-site rapid mixing method and reaction equipment, and belongs to the technical field of coatings. In order to solve the problems of coating foaming, curing delay and the like caused by non-uniform mixing and moisture sensitivity of traditional A / B components in a construction site, the invention provides that the A component consists of polyether polyol (molecular weight of 3000), an organic tin catalyst (0.5%) and an antioxidant (0.2%), and is preheated to 60 DEG C to improve the reaction activity; the component B is composed of amino-terminated polyether (molecular weight 2000), MDI prepolymer (25%) and molecular sieve (0.1%), and environmental moisture is adsorbed in real time through the molecular sieve. The corollary equipment integrates a mixing chamber (double-spiral blanking control), a reaction chamber (heating and stirring), a filtering blanking chamber (anti-blocking spiral shaft), outside-tank supporting legs, a driving motor and the like, and accurate proportioning (error + / -0.5%), rapid mixing (less than or equal to 5 minutes), namely spraying application and continuous spraying of A / B components on a construction site are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a method for rapid on-site mixing of two-component spray polyurea coatings and a reaction device. Background Art

[0002] A coating is a viscous liquid usually based on resin, oil or emulsion, which is applied to the surface of an object to be protected or decorated and can form a continuous film firmly attached to the object to be coated. Coatings can play roles such as decoration, anti-corrosion, insulation and mothproofing well, and are widely used in various fields.

[0003] Two-component spray polyurea coatings, as a kind of high-performance protective and decorative materials, have been widely used in many fields such as construction, bridges, tunnels, water conservancy, transportation, offshore engineering and floor coatings in recent years. Their unique performance advantages, such as rapid curing, high elasticity, excellent abrasion resistance, chemical resistance, weather resistance and good adhesion, make polyurea coatings show extraordinary capabilities in solving problems such as anti-corrosion, waterproofing and abrasion resistance in complex environments.

[0004] However, in actual construction, especially in extreme environments (such as humidity > 80% and drastic temperature fluctuations) or rapid construction scenarios (such as emergency repairs and continuous spraying), the existing technology still faces the following technical bottlenecks.

[0005] Firstly, traditional equipment lacks precise control over the preheating of A / B components. Existing methods often result in inconsistent reaction activities of components due to temperature fluctuations, causing local curing delays or incomplete reactions; and the pressure is unstable during the mixing process (especially when transporting high-viscosity materials), which is likely to introduce air bubbles, resulting in pinholes in the coating and a decrease in density.

[0006] Secondly, in rapid spraying scenarios (such as construction time ≤ 5 minutes), existing equipment is difficult to achieve instantaneous and uniform mixing of A / B components (error > ±1%), resulting in large fluctuations in the mechanical properties of the coating (such as tensile strength and elongation at break), and after long-term operation, the inner wall of the reaction chamber is easily adhered with unreacted materials or cured residues, reducing the heat transfer efficiency and affecting the uniformity of subsequent batches of coatings. Traditional cleaning methods (such as manual scraping) are inefficient and may damage the surface of the equipment.

[0007] Therefore, a method for rapid on-site mixing of two-component spray polyurea coatings and a reaction device are needed to solve the problems of uneven mixing, incomplete reaction and inconvenient cleaning of residues existing in the existing technology. Summary of the Invention

[0008] The purpose of the present invention is to provide a method for rapid on-site mixing of two-component spray polyurea coatings and a reaction device to solve the problems raised in the above background art.

[0009] To achieve the above object, the present invention provides the following technical solution: A method for rapid on-site mixing of two-component spray polyurea coatings, including component A and component B. Component A is made by using polyether polyol with a molecular weight of 3000 as the base resin, adding 0.5% of organotin catalyst to accelerate the formation of polyurea, and adding 0.2% of antioxidant for mixing. Component B is made by using low-viscosity terminal amino polyether with a molecular weight of 2000 as the chain extender, combining 25% of MDI prepolymer, and adding 0.1% of molecular sieve as the moisture absorbent and mixing evenly. Specifically, it includes the following steps:

[0010] S1. Use a high-precision electronic scale to accurately measure components A and B to ensure that the mixing ratio error does not exceed ±0.5%; the specific mixing ratio can be determined according to the requirements of the construction site.

[0011] S2. Place component A in a preheater and preheat it at 60°C for 30 minutes to accelerate the subsequent reaction; at the same time, store component B at 25°C to avoid premature reaction;

[0012] S3. Mix and react the preheated component A and component B through a reaction device;

[0013] S4. After the reaction is completed, filter the coating through a precision filter to remove impurities and unreacted raw materials;

[0014] S5. Conduct performance tests on the finished coating to ensure that each batch of products meets or exceeds industry standards. This step is for sampling and testing the mixed coating at the construction site.

[0015] It should be noted in the solution that the performance tests in step S5 include tensile strength, elongation at break, and chemical resistance.

[0016] On the other hand, the present invention also provides the following technical solution: A reaction device for the rapid on-site mixing method of two-component spray polyurea coatings, including a reaction tank, support legs, component A inlet, component B inlet, and a discharge pipe. The support legs are fixedly installed at the bottom of the reaction tank to support the reaction tank. The component A inlet and component B inlet are respectively fixedly connected to the top of the reaction tank and are symmetrically arranged left and right. A controller is fixedly installed outside the reaction tank. A heating device is fixedly installed between the reaction tank and the controller. A discharge valve is fixedly installed on the discharge pipe to control the discharging process of the discharge pipe. A driving motor is fixedly installed on the top of the reaction tank. The bottom end of the driving motor is fixedly connected to a driving shaft, and the driving shaft is rotatably installed in the reaction tank through a bearing. The reaction tank is sequentially provided with a stirring and mixing chamber, a stirring and reaction chamber, and a discharging chamber from top to bottom.

[0017] A mixing component and a regulating feeding component are arranged in the stirring and mixing chamber. The mixing component is arranged between the stirring and mixing chamber and the stirring reaction chamber. The regulating feeding component is arranged on the mixing component and connected to the driving shaft for feeding and conveying the materials in the stirring and mixing chamber.

[0018] A stirring paddle is fixedly connected to the driving shaft in the stirring reaction chamber for carrying out stirring reaction on the materials in the stirring reaction chamber.

[0019] The inner wall of the reaction tank is coated with a polytetrafluoroethylene coating. The rotation speed of the stirring paddle in the stirring reaction chamber is 200 - 500 rpm, and the material residue is reduced by high-speed shearing force.

[0020] As a preferred embodiment, the heating device is arranged outside the reaction tank corresponding to the stirring reaction chamber.

[0021] As a preferred embodiment, the mixing component includes a partition plate. The partition plate is fixedly installed in the reaction tank for separating the stirring and mixing chamber and the stirring reaction chamber. A mixing and stirring rod is fixedly installed on the driving shaft above the partition plate. The partition plate is rotatably arranged with the driving shaft.

[0022] As a preferred embodiment, the regulating feeding component includes a fixed cylinder. The fixed cylinder is fixedly connected to the driving shaft in the stirring and mixing chamber. An adjusting groove is formed on the outer surface of the fixed cylinder. A rotating groove is arranged at the top of the fixed cylinder. A rotating ring is rotatably arranged in the rotating groove. Connecting plates are fixedly connected to the front and rear side surfaces of the rotating ring. A positioning slide rod is fixedly connected to the bottom of the connecting plate near the end. A limiting plate is fixedly connected to the bottom end of the positioning slide rod. A spring is sleeved on the outer side of the positioning slide rod above the limiting plate. An adjusting rod is slidably arranged in the adjusting groove in a limited manner. An activity ring is fixedly connected to the outer end of the adjusting rod. The activity ring is sleeved on the outer side of the fixed cylinder. Connecting plates are fixedly connected to the front and rear side surfaces of the activity ring. Through holes are formed on the connecting plates corresponding to the positioning slide rods. A feeding rod is fixedly connected to the end of the connecting plate. A matching feeding hole is formed on the partition plate corresponding to the feeding rod.

[0023] As a preferred embodiment, the adjusting groove is arranged in a double - helix shape on the surface of the fixed cylinder, and its upper and lower ends are vertically communicated. Two adjusting rods are symmetrically arranged in the adjusting groove and connected to the activity ring.

[0024] As a preferred embodiment, the spring is arranged between the connecting plate and the connecting plate on the outer side of the positioning slide rod.

[0025] As a preferred embodiment, the bottom end of the feeding rod is arranged in an inclined shape.

[0026] As a preferred embodiment, a filter plate is fixedly connected inside the reaction tank between the blanking chamber and the stirring reaction chamber. The filter plate is rotatably arranged with the driving shaft. A spiral conveyor shaft is fixedly connected to the bottom end of the driving shaft below the filter plate. The spiral conveyor shaft is rotatably arranged inside the blanking pipe. The gap between the spiral conveyor shaft and the filter plate is ≤1 mm to ensure that the materials after reaction are completely discharged.

[0027] Compared with the prior art, a two-component spray polyurea coating on-site rapid mixing method and reaction equipment provided by the present invention has at least the following beneficial effects:

[0028] (1) By precisely selecting the types and proportions of raw materials and introducing a moisture absorbent, the problem of performance degradation caused by raw material impurities and moisture in the traditional preparation process is effectively solved. The prepared polyurea coating has excellent spraying performance and rapid curing characteristics, simplifies the construction process, improves the construction efficiency, and reduces the construction difficulty.

[0029] (2) Through the stirring and mixing chamber arranged in the reaction tank, the A component and the B component inside can be mixed and stirred. The mixing is completed through the mixing assembly in the stirring and mixing chamber. And with the setting of the adjustable blanking assembly, the materials in the stirring and mixing chamber can be discharged, facilitating the subsequent reaction work, improving the practicability of the device. At the same time, through the stirring reaction chamber arranged below the stirring and mixing chamber, the fully mixed materials in the stirring and mixing chamber can be stirred and reacted to make the reaction complete. The filter plate is set to realize the material filtering operation. At the same time, with the setting of the spiral conveyor shaft, when the materials are discharged through the blanking valve and the blanking pipe, material blockage is effectively prevented, facilitating the on-site construction spraying of the mixed materials. And through the coordinated action of the spiral conveyor shaft and the filter plate, the materials after reaction are forcibly discharged to prevent adhesion inside the chamber. At the same time, the inner wall of the reaction tank is coated with polytetrafluoroethylene to reduce the material adhesion rate. Combined with the high-speed shearing of the stirring paddle, dynamic self-cleaning is achieved. Description of the Drawings

[0030] Figure 1 is a three-dimensional structural schematic diagram of a reaction equipment for producing two-component spray polyurea coating of the present invention;

[0031] Figure 2 is an internal sectional structural schematic diagram of a reaction equipment for producing two-component spray polyurea coating of the present invention;

[0032] Figure 3 is an internal structural schematic diagram of a reaction equipment for producing two-component spray polyurea coating of the present invention;

[0033] Figure 4Schematic diagram of the internal disassembly structure of a reaction device for producing two-component spray polyurea coatings according to the present invention;

[0034] Figure 5 Schematic diagram of the disassembly structure of the adjustable feeding component of a reaction device for producing two-component spray polyurea coatings according to the present invention.

[0035] In the figure: 1, reaction tank; 101, controller; 102, heating device; 2, support leg; 3, A-component feed inlet; 4, B-component feed inlet; 5, feed pipe; 501, feed valve; 6, drive motor; 601, drive shaft; 7, stirring and mixing chamber; 71, mixing component; 711, partition board; 712, mixing and stirring rod; 72, adjustable feeding component; 721, fixed cylinder; 722, adjustment groove; 723, rotation groove; 724, rotating ring; 725, connecting plate; 726, positioning slide bar; 727, limiting plate; 728, spring; 729, movable ring; 7210, adjustment rod; 7211, connecting plate; 7212, through hole; 7213, feed rod; 7214, feed hole; 8, stirring and reaction chamber; 801, stirring paddle; 9, feed chamber; 901, filter plate; 902, spiral conveyor shaft. Specific embodiments

[0036] The following further describes the present invention in conjunction with embodiments.

[0037] The present invention provides a method for rapid on-site mixing of two-component spray polyurea coatings. First, the A component and the B component are prepared. Among them, the A component selects polyether polyol with a molecular weight of 3000 as the base resin. This raw material has good fluidity and reactivity. 0.5% (based on the weight of polyether polyol) of an organotin catalyst (such as dibutyltin dilaurate) is added to accelerate the formation of polyurea, and 0.2% (based on the weight of polyether polyol) of an antioxidant (such as vitamin E) is added to improve the antioxidant performance of the coating. As an additive, the A-component raw materials and additives are mixed evenly to ensure that the catalyst and antioxidant are evenly distributed in the polyether polyol; the B component selects low-viscosity terminal amino polyether (molecular weight of 2000) as the chain extender. This raw material can react with the isocyanate groups in the A component to form polyurea segments; 25% (percentage based on the total weight of the B component) of MDI prepolymer (diisocyanate prepolymer) is combined. This prepolymer contains multiple isocyanate groups and can react with the hydroxyl groups in the A component. 0.1% (percentage based on the total weight of the B component) of molecular sieve is added as a moisture absorbent to remove trace moisture in the reaction system and prevent side reactions. As an additive, the B-component raw materials and additives are mixed evenly to ensure that the molecular sieve is evenly distributed in the terminal amino polyether and MDI prepolymer.

[0038] Example 1

[0039] According to the above technical solution, 100 kg of polyurea coating was prepared. Component A contains 30 kg of polyether polyol, 0.15 kg of organotin catalyst and 0.06 kg of antioxidant; Component B contains 20 kg of amino-terminated polyether, 25 kg of MDI prepolymer and 0.01 kg of molecular sieve.

[0040] The mixed coating was reacted at 90 °C for 1.5 hours. After filtration, the tensile strength was measured to be 30 MPa, the elongation at break was 400%, and the chemical resistance test was qualified.

[0041] Example Two

[0042] Compared with Example One, the ratio of Component A and Component B was adjusted. Component A was reduced to 25 kg of polyether polyol, and the other components were reduced proportionally; in Component B, the amino-terminated polyether was increased to 30 kg, and the other components were adjusted proportionally.

[0043] The mixed coating was reacted under the same conditions. The measured tensile strength was 32 MPa, and the elongation at break was 380%, which also met the performance requirements.

[0044] According to the above working process, it can be seen that by precisely selecting the types and proportions of raw materials and introducing a water absorbent, the problem of performance degradation caused by raw material impurities and moisture in the traditional preparation process was effectively solved. The prepared polyurea coating has excellent spraying performance and fast curing characteristics, simplifies the construction process, improves the construction efficiency, and reduces the construction difficulty.

[0045] Example Three

[0046] Example 3 of this application discloses a reaction device for producing two-component spray polyurea coating, which is used for the preparation of polyurea coating.

[0047] Please refer to Figure 1 - Figure 5, A reaction device for producing two-component spray polyurea coatings, comprising a reaction tank 1, support legs 2, an A-component feed inlet 3, a B-component feed inlet 4, and a discharge pipe 5. The support legs 2 are fixedly installed at the bottom of the reaction tank 1 to support the reaction tank 1. The A-component feed inlet 3 and the B-component feed inlet 4 are respectively fixedly connected to the top of the reaction tank 1 and are symmetrically arranged left and right. A controller 101 is fixedly installed outside the reaction tank 1. The inner wall of the reaction tank 1 is coated with a polytetrafluoroethylene coating. The rotation speed of the stirring paddle 801 in the stirring reaction chamber 8 is 200 - 500 rpm, and the material residue is reduced by high-speed shear force. A heating device 102 is fixedly installed between the reaction tank 1 and the controller 101. A discharge valve 501 is fixedly installed on the discharge pipe 5 to control the discharging process of the discharge pipe 5. A driving motor 6 is fixedly installed on the top of the reaction tank 1. The bottom end of the driving motor 6 is fixedly connected to a driving shaft 601. The driving shaft 601 is rotatably installed in the reaction tank 1 through a bearing. Inside the reaction tank 1, a stirring and mixing chamber 7, a stirring reaction chamber 8, and a discharging chamber 9 are sequentially arranged from top to bottom.

[0048] A mixing component 71 and an adjustable discharging component 72 are arranged in the stirring and mixing chamber 7. The mixing component 71 is arranged between the stirring and mixing chamber 7 and the stirring reaction chamber 8. The adjustable discharging component 72 is arranged on the mixing component 71 and is connected to the driving shaft 601 for discharging and conveying the materials in the stirring and mixing chamber 7.

[0049] A stirring paddle 801 is fixedly connected to the driving shaft 601 in the stirring reaction chamber 8 for stirring and reacting the materials in the stirring reaction chamber 8. The heating device 102 is arranged outside the reaction tank 1 corresponding to the stirring reaction chamber 8.

[0050] During use, the materials inside are stirred by the rotation of the stirring paddle 801, so as to cooperate with the operation of the heating device 102 to stir and react the materials in the stirring reaction chamber 8, thereby improving the stirring efficiency of the materials and facilitating the improvement of the reaction rate.

[0051] Further, as shown in Figure 2 、 Figure 3 and Figure 4 , it is worth specifically explaining that the mixing component 71 includes a partition plate 711. The partition plate 711 is fixedly installed in the reaction tank 1 to separate the stirring and mixing chamber 7 and the stirring reaction chamber 8. Above the partition plate 711, a mixing and stirring rod 712 is fixedly installed on the driving shaft 601. The partition plate 711 is rotatably arranged with the driving shaft 601.

[0052] Further, as shown in Figure 3 、 Figure 4 and Figure 5As shown, it is worth specifically explaining that the blanking adjusting component 72 includes a fixed cylinder 721. The fixed cylinder 721 is fixedly connected to the driving shaft 601 in the stirring and mixing chamber 7. An adjusting groove 722 is formed on the outer surface of the fixed cylinder 721. A rotating groove 723 is provided at the top of the fixed cylinder 721. A rotating ring 724 is rotatably arranged in the rotating groove 723. Connecting plates 725 are fixedly connected to the front and rear side surfaces of the rotating ring 724. A positioning slide rod 726 is fixedly connected to the bottom of the connecting plate 725 near the end. A limiting plate 727 is fixedly connected to the bottom end of the positioning slide rod 726. A spring 728 is sleeved on the outer side of the positioning slide rod 726 above the limiting plate 727. An adjusting rod 7210 is arranged in the adjusting groove 722 in a limited sliding manner. An activity ring 729 is fixedly connected to the outer end of the adjusting rod 7210. The activity ring 729 is sleeved on the outer side of the fixed cylinder 721. Connecting plates 7211 are fixedly connected to the front and rear side surfaces of the activity ring 729. Through holes 7212 corresponding to the positioning slide rods 726 are formed on the connecting plates 7211. A blanking rod 7213 is fixedly connected to the end of the connecting plate 7211. The bottom end of the blanking rod 7213 is arranged in an inclined plane. A matching blanking hole 7214 is formed in the partition plate 711 corresponding to the blanking rod 7213. The adjusting groove 722 is arranged in a double spiral shape on the surface of the fixed cylinder 721, and its upper and lower ends are vertically communicated. Two adjusting rods 7210 are symmetrically arranged in the adjusting groove 722 and are connected to the activity ring 729. The spring 728 is arranged between the connecting plate 725 and the connecting plate 7211 on the outer side of the positioning slide rod 726.

[0053] During use, the drive motor 6 operates to rotate the drive shaft 601, thereby causing the mixing and stirring rod 712 to rotate within the stirring and mixing chamber 7, and then mixing and stirring the component A and component B therein, so that component A and component B are fully mixed. When the component A and component B in the stirring and mixing chamber 7 are mixed by the mixing and stirring rod 712, at this time, under the rotation of the fixed cylinder 721, through the setting of the adjustment groove 722, the movable ring 729 reciprocates up and down outside the fixed cylinder 721 through the adjustment rod 7210, and then the feeding rod 7213 slides in the feeding hole 7214 through the connecting plate 7211. When the bottom inclined surface of the feeding rod 7213 slides to the upper part of the feeding hole 7214, the component A and component B in the stirring and mixing chamber 7 are fed at the feeding hole 7214 and conveyed to the stirring reaction chamber 8. And through the movement of the connecting plate 7211, the positioning slide rod 726 slides in the through port 7212 to squeeze the spring 728. Through the elastic force of the spring 728, when the movable ring 729 slides to a high position outside the fixed cylinder 721 in the adjustment groove 722, the movable ring 729 can be pushed to the bottom of the fixed cylinder 721 through the connecting plate 7211, and then the feeding hole 7214 is blocked by the feeding rod 7213, so that the mixed component A and component B cannot be conveyed to the stirring reaction chamber 8. The component A and component B are mixed and stirred by the mixing and stirring rod 712, thereby improving the mixing efficiency of the materials.

[0054] Further as Figure 2 , Figure 3 and Figure 4 shown, specifically, a filter plate 901 is fixedly connected in the reaction tank 1 between the feeding chamber 9 and the stirring reaction chamber 8. The filter plate 901 is rotatably arranged with the drive shaft 601. A spiral conveyor shaft 902 is fixedly connected to the bottom end of the drive shaft 601 below the filter plate 901. The spiral conveyor shaft 902 is rotatably arranged in the feeding pipe 5. The gap between the spiral conveyor shaft 902 and the filter plate 901 is ≤1 mm to ensure that the materials after reaction are completely discharged.

[0055] During use, through the rotation of the spiral conveyor shaft 902 and the setting of the feeding valve 501, it is convenient to convey the materials in the feeding chamber 9, which can prevent the materials from being blocked, and then improve the conveying efficiency of the materials. And through the cooperation of the spiral conveyor shaft 902 and the filter plate 901, the materials after reaction are forcibly discharged to prevent adhesion in the chamber. At the same time, the inner wall of the reaction tank 1 is coated with polytetrafluoroethylene to reduce the material adhesion rate, and combined with the high-speed shearing of the stirring paddle 801, dynamic self-cleaning is achieved.

[0056] According to the above working process, it can be known that: by setting the stirring and mixing chamber 7 in the reaction tank 1, the mixing and stirring of component A and component B therein can be carried out, so that they can complete sufficient stirring and mixing work in the stirring and mixing chamber 7 through the mixing component 71. And with the setting of the adjustable feeding component 72, the feeding operation of the materials in the stirring and mixing chamber 7 can be carried out, so as to facilitate the subsequent reaction work, improve the practicability of the device. At the same time, by setting the stirring and reaction chamber 8 below the stirring and mixing chamber 7, the fully mixed materials in the stirring and mixing chamber 7 can be subjected to stirring and reaction work to make the reaction complete, and the material filtering operation is realized by the cooperation of the set filter plate 901. At the same time, with the setting of the screw conveyor shaft 902, when the materials are fed through the feeding valve 501 and the feeding pipe 5, the blockage of the materials can be effectively prevented, thereby improving the uniformity and feeding efficiency of the material feeding

[0057] This solution has the following working process: When this device is in use, the A component and the B component are respectively transported into the stirring and mixing chamber 7 through the A-component feed port 3 and the B-component feed port 4. At this time, the driving motor 6 runs, causing the driving shaft 601 to rotate, so that the mixing and stirring rod 712 rotates in the stirring and mixing chamber 7, and then the A component and the B component in it are mixed and stirred, so that the A component and the B component are fully mixed. When the mixing and stirring rod 712 mixes the A component and the B component in the stirring and mixing chamber 7, at this time, under the rotation of the fixed cylinder 721, through the setting of the adjustment groove 722, the movable ring 729 reciprocates up and down on the outside of the fixed cylinder 721 through the adjustment rod 7210, so that the feeding rod 7213 slides in the feeding hole 7214 through the connecting plate 7211. When the bottom inclined surface of the feeding rod 7213 slides to the upper part of the feeding hole 7214, the A component and the B component in the stirring and mixing chamber 7 are fed at the feeding hole 7214 and transported into the stirring reaction chamber 8. And through the movement of the connecting plate 7211, the positioning slide rod 726 slides in the through hole 7212 to squeeze the spring 728. Through the elastic force of the spring 728, when the movable ring 729 slides to a high position on the outside of the fixed cylinder 721 in the adjustment groove 722, the movable ring 729 can be pushed to the bottom of the fixed cylinder 721 through the connecting plate 7211, and then the feeding hole 7214 is blocked by the feeding rod 7213, so that the mixed A component and B component cannot be transported into the stirring reaction chamber 8. The material is mixed and stirred by the mixing and stirring rod 712 to improve the mixing efficiency of the material. At the same time, the material in it is stirred by the rotation of the stirring paddle 801 to facilitate the operation of the heating device 102 to carry out a stirring reaction on the material in the stirring reaction chamber 8, and then improve the stirring efficiency of the material to facilitate the improvement of its reaction rate. At the same time, through the setting of the filter plate 901, the mixed material is filtered. At the same time, through the rotation of the spiral conveyor shaft 902 and the setting of the discharge valve 501, it is convenient to transport the material in the discharge chamber 9, which can prevent the material from blocking and then improve the conveying efficiency of the material.

[0058] In summary: By precisely selecting the types and proportions of raw materials and introducing a moisture absorbent, the problem of performance degradation caused by raw material impurities and moisture in the traditional preparation process is effectively solved. The prepared polyurea coating has excellent spraying performance and rapid curing characteristics, simplifies the construction process, improves the construction efficiency, and reduces the construction difficulty. By setting a stirring and mixing chamber 7 in the reaction tank 1, the A component and the B component therein can be mixed and stirred, and they can complete sufficient stirring and mixing work in the stirring and mixing chamber 7 through the mixing assembly 71. With the setting of the adjustable feeding assembly 72, the materials in the stirring and mixing chamber 7 can be fed, facilitating subsequent reaction work, improving the practicability of the device. At the same time, by setting a stirring and reaction chamber 8 below the stirring and mixing chamber 7, the fully mixed materials in the stirring and mixing chamber 7 can be subjected to stirring and reaction work to make the reaction complete. The filter plate 901 is provided to realize the material filtering operation. At the same time, with the setting of the screw conveyor shaft 902, when the materials are fed through the feeding valve 501 and the feeding pipe 5, the blockage of the materials is effectively prevented, thereby improving the uniformity and efficiency of the material feeding.

[0059] The above are all the preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A method for on-site rapid mixing of two-component spray polyurea coatings, including component A and component B, characterized in that: The component A is made by using polyether polyol with a molecular weight of 3000 as the base resin, adding 0.5% of an organotin catalyst to accelerate the formation of polyurea, and adding 0.2% of an antioxidant and mixing them. The component B is made by using low-viscosity amino-terminated polyether with a molecular weight of 2000 as a chain extender, combining 25% of an MDI prepolymer, adding 0.1% of molecular sieve as a moisture absorbent and mixing them evenly. It specifically includes the following steps: S1. Use a high-precision electronic scale to accurately measure components A and B to ensure that the ratio error does not exceed ±0.5%; S2. Place component A in a preheater and preheat it at 60°C for 30 minutes to accelerate subsequent reactions; at the same time, store component B at 25°C to avoid premature reactions; S3. Mix and react the preheated component A and component B through a reaction device; S4. After the reaction, filter the coating through a precision filter to remove impurities and unreacted raw materials; S5. Conduct performance tests on the finished coating to ensure that each batch of products meets or exceeds industry standards.

2. A method for on-site rapid mixing of a two-component spray polyurea coating according to claim 1, characterized in that: The performance tests described in step S5 include tensile strength, elongation at break, and chemical resistance.

3. A reaction device for the on-site rapid mixing method of the two-component spray polyurea coating according to any one of claims 1-2, comprising a reaction tank (1), support legs (2), an A-component feed inlet (3), a B-component feed inlet (4) and a discharge pipe (5). The support legs (2) are fixedly installed at the bottom of the reaction tank (1) for supporting the reaction tank (1). The A-component feed inlet (3) and the B-component feed inlet (4) are respectively fixedly connected to the top of the reaction tank (1) and are symmetrically arranged left and right. It is characterized in that: An external fixed controller (101) is installed on the reaction tank (1). A heating device (102) is fixedly installed between the reaction tank (1) and the controller (101). A blanking valve (501) is fixedly installed on the blanking pipe (5) to control the blanking process of the blanking pipe (5). A driving motor (6) is fixedly installed on the top of the reaction tank (1). The bottom end of the driving motor (6) is fixedly connected to a driving shaft (601). The driving shaft (601) is rotatably installed in the reaction tank (1) through a bearing. Inside the reaction tank (1), a stirring and mixing chamber (7), a stirring and reaction chamber (8), and a blanking chamber (9) are arranged in sequence from top to bottom; A mixing component (71) and an adjustable blanking component (72) are arranged in the stirring and mixing chamber (7). The mixing component (71) is arranged between the stirring and mixing chamber (7) and the stirring and reaction chamber (8). The adjustable blanking component (72) is arranged on the mixing component (71) and is connected to the driving shaft (601) for blanking and conveying the materials in the stirring and mixing chamber (7); A stirring paddle (801) is fixedly connected to the driving shaft (601) in the stirring and reaction chamber (8) for stirring and reacting the materials in the stirring and reaction chamber (8); The inner wall of the reaction tank (1) is coated with a polytetrafluoroethylene coating. The rotation speed of the stirring paddle (801) in the stirring and reaction chamber (8) is 200 - 500 rpm, and the high-speed shear force is used to reduce material residue.

4. The reaction equipment for the on-site rapid mixing method of a two-component spray polyurea coating according to claim 3, characterized in that: The heating device (102) is arranged on the outside of the reaction tank (1) corresponding to the stirring and reaction chamber (8).

5. The reaction equipment for the on-site rapid mixing method of a two-component sprayed polyurea coating according to claim 4, characterized in that: The mixing component (71) includes a partition plate (711). The partition plate (711) is fixedly installed in the reaction tank (1) to separate the stirring and mixing chamber (7) and the stirring and reaction chamber (8). Above the partition plate (711), a mixing and stirring rod (712) is fixedly installed on the driving shaft (601). The partition plate (711) is rotatably arranged with the driving shaft (601).

6. The reaction equipment for the on-site rapid mixing method of a two-component sprayed polyurea coating according to claim 5, characterized in that: The described adjusting blanking component (72) includes a fixed cylinder (721), the fixed cylinder (721) is fixedly connected to the drive shaft (601) in the stirring and mixing chamber (7), an adjusting groove (722) is formed on the outer surface of the fixed cylinder (721), a rotating groove (723) is arranged at the top of the fixed cylinder (721), a rotating ring (724) is rotatably arranged in the rotating groove (723), connecting plates (725) are fixedly connected to the front and rear side surfaces of the rotating ring (724), a positioning slide rod (726) is fixedly connected to the bottom of the connecting plate (725) near the end, a limiting plate (727) is fixedly connected to the bottom end of the positioning slide rod (726), a spring (728) is sleeved outside the positioning slide rod (726) above the limiting plate (727), an adjusting rod (7210) is slidably arranged in the adjusting groove (722) in a limited manner, an activity ring (729) is fixedly connected to the outer end of the adjusting rod (7210), the activity ring (729) is sleeved outside the fixed cylinder (721), connecting plates (7211) are fixedly connected to the front and rear side surfaces of the activity ring (729), through openings (7212) corresponding to the positioning slide rod (726) are formed on the connecting plates (7211), a blanking rod (7213) is fixedly connected to the end of the connecting plate (7211), and a matching blanking hole (7214) is formed in the blanking rod (7213) corresponding to the partition plate (711).

7. The reaction equipment for the on-site rapid mixing method of a two-component spray polyurea coating according to claim 6, characterized in that: The adjusting groove (722) is arranged in a double - spiral shape on the surface of the fixed cylinder (721), and its upper and lower ends are vertically communicated, and two adjusting rods (7210) are symmetrically arranged in the adjusting groove (722) and are connected to the activity ring (729).

8. The reaction equipment for the on-site rapid mixing method of a two-component spray polyurea coating according to claim 7, characterized in that: The spring (728) is arranged between the connecting plate (725) and the connecting plate (7211) outside the positioning slide rod (726).

9. The reaction equipment for the on-site rapid mixing method of a two-component spray polyurea coating according to claim 8, characterized in that: The bottom end of the blanking rod (7213) is arranged in an inclined plane.

10. The reaction equipment for the on-site rapid mixing method of a two-component sprayed polyurea coating according to claim 9, characterized in that: A filter plate (901) is fixedly connected in the reaction tank (1) between the blanking chamber (9) and the stirring reaction chamber (8), the filter plate (901) is rotatably arranged with the drive shaft (601), a spiral conveyor shaft (902) is fixedly connected to the bottom end of the drive shaft (601) below the filter plate (901), the spiral conveyor shaft (902) is rotatably arranged in the blanking pipe (5), and the gap between the spiral conveyor shaft (902) and the filter plate (901) is ≤1 mm to ensure that the materials after reaction are completely discharged.

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