Wear resistance quality control method and system for special powder coating for grain machinery

Abstract

The invention provides a wear-resisting property quality control method and system for a special powder coating for grain machinery, relates to the technical field of grain machinery, discloses the wear-resisting property quality control method for the special powder coating for the grain machinery, and belongs to the technical field of powder coating preparation. Stirring and mixing the epoxy grain mechanical wear-resistant coating to obtain a powder coating premix; adding carbon fibers and a boron nitride flexibilizer into the premix, and carrying out high-speed dispersion treatment; extruding the toughened premix through a twin-screw extruder, and cooling to obtain a solid powder coating; carrying out surface modification treatment on the solid powder coating by adopting mixed gas of oxygen and argon under the action of plasma; and finally carrying out quality detection. Through addition of the toughening agent and plasma surface modification treatment, the wear resistance of the powder coating is remarkably improved, the technological process is controllable, and the powder coating is suitable for industrial production.

Description

Technical Field

[0001] The present invention relates to grain machinery technology, in particular to a wear-resistant quality control method and system for powder coatings specially used for grain machinery. Background Art

[0002] Powder coatings for grain processing machinery are specialized coating materials applied to the surface of grain processing equipment. They offer excellent wear resistance, corrosion resistance, and food safety. With the rapid development of the grain processing industry, performance requirements for grain processing machinery coatings are also increasing, with particularly stringent requirements for wear resistance.

[0003] Traditional grain machinery coatings mainly use liquid coatings, which have some problems: first, liquid coatings are prone to produce volatile organic compounds during use, which are harmful to the environment and human health; second, the coating process of liquid coatings is complicated, requiring multiple steps, and the production efficiency is low; finally, the wear resistance of liquid coatings is limited, and it is easy to wear and fall off during long-term use, affecting the service life of grain processing equipment and food safety.

[0004] As a new coating material, powder coatings offer advantages such as environmental friendliness, high efficiency, and wear resistance, and hold great promise for their application in grain processing machinery. However, existing powder coatings specifically designed for grain processing machinery still have several drawbacks: first, their wear resistance is suboptimal, making them difficult to meet the demands of high-abrasion environments; second, their poor adhesion to the substrate leads to sloughing; and third, their insufficient polar groups on the coating surface lead to adhesion when in contact with food, compromising the efficiency and quality of grain processing. Therefore, developing a powder coating specifically designed for grain processing machinery with superior wear resistance and surface properties is crucial for improving the performance of grain processing equipment and food safety. Summary of the Invention

[0005] The embodiments of the present invention provide a method and system for controlling the wear resistance of powder coatings specifically for grain machinery, which can solve the problems in the prior art.

[0006] According to a first aspect of the embodiments of the present invention,

[0007] Provides quality control methods for wear resistance of powder coatings for grain machinery, including:

[0008] Adding a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stirring and mixing the epoxy grain machinery wear-resistant coating to ensure that the epoxy grain machinery wear-resistant coating is fully mixed to obtain a powder coating premix;

[0009] Adding carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing, and performing shear dispersion treatment on the carbon fiber and the boron nitride toughening agent using a high-speed disperser so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix to obtain a toughened powder coating premix;

[0010] conveying the toughened powder coating premix to a twin-screw extruder for extrusion to obtain a molten powder coating; cooling the temperature of the molten powder coating to room temperature to obtain a solid powder coating;

[0011] A mixed gas of oxygen and argon is introduced into the solid powder coating, and a plasma generator is started to generate plasma to react with the solid powder coating on the surface, thereby forming a modified layer having polar groups on the surface of the solid powder coating to obtain a modified powder coating premix;

[0012] The modified powder coating premix is subjected to quality inspection, and the inspection items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified by the preset standard, the preparation of the special powder coating for grain machinery is completed.

[0013] Adding a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stirring and mixing the epoxy grain machinery wear-resistant coating to fully mix the epoxy grain machinery wear-resistant coating to obtain a powder coating premix comprising:

[0014] Adding a predetermined ratio of epoxy grain machinery wear-resistant coating to the stirring tank, and setting a plurality of sensing detection devices on the inner wall of the stirring tank, wherein the plurality of sensing detection devices include a viscosity sensor, a temperature sensor and a conductivity sensor, and the plurality of sensing detection devices respectively collect viscosity data, temperature data and conductivity data of the epoxy grain machinery wear-resistant coating;

[0015] A plurality of sampling ports are provided at different positions of the stirring tank, and local samples of the epoxy grain machinery wear-resistant coating are collected through the plurality of sampling ports to obtain local sampling concentrations of the local samples;

[0016] Calculating a mixing uniformity index based on the local sampling concentration, and stopping stirring when the mixing uniformity index reaches a preset range; performing fluorescent tracing detection on the epoxy grain machinery wear-resistant coating after stirring to obtain a flow field distribution diagram of the epoxy grain machinery wear-resistant coating, and judging the mixing uniformity of the epoxy grain machinery wear-resistant coating based on the flow field distribution diagram;

[0017] When the mixing uniformity of the epoxy grain machinery wear-resistant coating meets the preset conditions, the stirred epoxy grain machinery wear-resistant coating is output to the next process to obtain a powder coating premix.

[0018] The carbon fiber and the boron nitride toughening agent are added to the uniformly mixed powder coating premix for secondary mixing, and the carbon fiber and the boron nitride toughening agent are sheared and dispersed by a high-speed disperser so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix. The toughened powder coating premix comprises:

[0019] Adding carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix, and performing shear dispersion treatment on the carbon fiber and the boron nitride toughening agent using a high-speed disperser, wherein the high-speed disperser is provided with a temperature sensor and a shear force sensor, and the dispersion temperature and shear stress of the carbon fiber and the boron nitride toughening agent are monitored in real time by the temperature sensor and the shear force sensor;

[0020] Inert gas is introduced into the high-speed disperser, and polar functional groups formed on the surface of the carbon fiber are treated by plasma in the inert gas environment to increase the surface free energy of the carbon fiber;

[0021] Adding a powder coating premix to the high-speed disperser, co-dispersing the powder coating premix with the carbon fiber and the boron nitride toughening agent, and forming a three-dimensional network structure under the dispersing action of the high-speed disperser;

[0022] Setting a plurality of sampling detection points at different positions of the three-dimensional network structure, collecting samples at the sampling detection points, and measuring the dispersed particle size distribution of the carbon fiber and the boron nitride toughening agent in the samples using a laser particle size analyzer;

[0023] The dispersed powder coating premix is subjected to a stress-strain test and a fracture toughness test to obtain the Young's modulus and the critical strain energy release rate of the powder coating premix; when the Young's modulus and the critical strain energy release rate meet the preset requirements, the powder coating premix is transported to a subsequent process for processing to obtain a toughened powder coating premix.

[0024] Adding a powder coating premix to the high-speed disperser, co-dispersing the powder coating premix with the carbon fiber and the boron nitride toughening agent, and forming a three-dimensional network structure under the dispersing action of the high-speed disperser comprises:

[0025] adding a powder coating premix into the high-speed disperser, performing a shear rheology test on the powder coating premix at different shear rates to obtain the shear stress of the powder coating premix at the different shear rates;

[0026] establishing a rheological curve according to the corresponding relationship between the shear stress and the shear rate, obtaining the zero shear viscosity and infinite shear viscosity of the powder coating premix through the rheological curve, and determining an optimal shear rate range based on the zero shear viscosity and the infinite shear viscosity;

[0027] Within the optimal shear rate range, adding carbon fiber and a boron nitride toughening agent to the powder coating premix, applying an electrostatic field and spraying a surfactant during the dispersion process of the high-speed disperser, and offsetting the van der Waals force between the carbon fiber and the boron nitride toughening agent by the electrostatic force generated by the electrostatic field and the steric resistance generated by the surfactant;

[0028] Measuring the volume fractions of the carbon fiber and the boron nitride toughening agent, calculating a mixing entropy change according to the volume fractions, and adjusting the ratio of the carbon fiber and the boron nitride toughening agent based on the calculated result of the mixing entropy change so that the mixing entropy change reaches a maximum value;

[0029] The calculation result of the hybrid entropy change is subjected to synchrotron radiation small-angle scattering analysis to obtain a scattering vector and a radial distribution function of the calculation result of the hybrid entropy change, and a three-dimensional network structure is obtained by weighted calculation based on the scattering vector and the radial distribution function.

[0030] A mixed gas of oxygen and argon is introduced into the solid powder coating, a plasma generator is started to generate plasma to react with the solid powder coating on the surface, and a modified layer having polar groups is formed on the surface of the solid powder coating to obtain a modified powder coating premix, comprising:

[0031] Passing a mixed gas of oxygen and argon into the solid powder coating, controlling the flow rate of the oxygen to be smaller than the flow rate of the argon, so that the mixed gas forms a uniform atmosphere in the solid powder coating;

[0032] In the uniform atmosphere, the solid powder coating is evenly spread on the stage at the bottom of the reaction chamber, wherein the thickness of the solid powder coating is less than one quarter of the height of the stage;

[0033] The reaction chamber is evacuated to a preset vacuum degree, and then the mixed gas is introduced to make the working pressure of the reaction chamber reach the preset pressure, and the reaction chamber is left to stand for pretreatment;

[0034] Starting a plasma generator to generate plasma, adjusting the output power of the plasma generator to a first preset power, and controlling the discharge distance between the plasma and the solid powder coating to reach a preset distance;

[0035] The oxygen in the mixed gas is ionized under the action of the plasma to form active oxygen, and the active oxygen chemically reacts with the surface of the solid powder coating to form a modified layer containing polar groups on the surface of the solid powder coating;

[0036] According to the growth of the modified layer, adjusting the output power of the plasma generator to a second preset power, and controlling the modified layer to grow uniformly to a preset thickness;

[0037] Adjusting the power density of the plasma generator to control the polar groups to form a uniform distribution in the modified layer so that the surface density of the polar groups reaches a preset density;

[0038] The polar group density on the surface of the solid powder coating is monitored. When the rate of change of the polar group density measured multiple times in succession is less than a preset change threshold, the plasma generator is turned off and the mixture is cooled to room temperature to obtain a surface-modified powder coating premix.

[0039] The oxygen in the mixed gas is ionized under the action of the plasma to form active oxygen, and the active oxygen chemically reacts with the surface of the solid powder coating to form a modified layer containing polar groups on the surface of the solid powder coating, which includes:

[0040] In a plasma environment, the oxygen in the mixed gas is ionized to form active oxygen;

[0041] Controlling the active oxygen to chemically react with the surface of the solid powder coating to form chemically bonded polar groups on the surface of the solid powder coating;

[0042] The polar groups gradually grow on the surface of the solid powder coating to form a modified layer, and the polar groups in the modified layer are distributed in a gradient from the surface to the inside.

[0043] The modified powder coating premix is subjected to quality testing, wherein the testing items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified by the preset standard, the preparation of the powder coating for grain machinery is completed, which includes:

[0044] The modified powder coating premix is subjected to a particle size distribution measurement to obtain a particle distribution parameter of the powder coating premix, and a particle size uniformity coefficient of the powder coating premix is calculated by dividing the standard deviation of the particle distribution parameter by the average particle size and multiplying the result by 100%;

[0045] measuring the bulk density and tap density of the powder coating premix, calculating a flowability index of the powder coating premix by subtracting the bulk density from the tap density, dividing the result by the tap density, and multiplying the result by 100%, and determining the flow characteristics of the powder coating premix based on the flowability index;

[0046] Under preset temperature and pressure conditions, measuring the melting mass of the powder coating premix per unit time, and calculating the melt index of the powder coating premix according to the melting mass divided by the unit time;

[0047] preparing a standard sample based on the particle size uniformity coefficient, the flow characteristics, and the melt index, subjecting the standard sample to a prescribed number of wear cycles, measuring the mass of the standard sample before and after wear, and calculating the wear resistance index of the standard sample by subtracting the mass of the standard sample after wear from the mass of the standard sample before wear and dividing the result by the product of the density and thickness of the standard sample;

[0048] When the wear resistance index reaches the requirement specified by the preset standard, it is determined that the quality of the modified powder coating premix meets the special requirements for grain machinery.

[0049] According to a second aspect of the embodiments of the present invention,

[0050] Provide a wear-resistant quality control system for powder coatings for grain machinery, including:

[0051] The first unit is used to add a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stir and mix the epoxy grain machinery wear-resistant coating, and make the epoxy grain machinery wear-resistant coating fully mixed to obtain a powder coating premix;

[0052] The second unit is used to add carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing, and use a high-speed disperser to shear and disperse the carbon fiber and the boron nitride toughening agent so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix to obtain a toughened powder coating premix;

[0053] The third unit is used to convey the toughened powder coating premix to a twin-screw extruder for extrusion to obtain a molten powder coating; and cool the temperature of the molten powder coating to room temperature to obtain a solid powder coating;

[0054] The fourth unit is used to introduce a mixed gas of oxygen and argon into the solid powder coating, start a plasma generator to generate plasma to react with the solid powder coating on the surface, form a modified layer having polar groups on the surface of the solid powder coating, and obtain a modified powder coating premix;

[0055] The fifth unit is used to perform quality inspection on the modified powder coating premix. The inspection items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified in the preset standard, the preparation of the special powder coating for grain machinery is completed.

[0056] According to a third aspect of the embodiments of the present invention,

[0057] An electronic device is provided, comprising:

[0058] processor;

[0059] a memory for storing processor-executable instructions;

[0060] The processor is configured to call the instructions stored in the memory to execute the aforementioned method.

[0061] According to a fourth aspect of the embodiments of the present invention,

[0062] A computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the method described above is implemented.

[0063] The beneficial effects of this application are as follows:

[0064] The wear resistance quality control method of powder coatings specially used for grain machinery provided by the present invention significantly improves the toughness and wear resistance of the powder coatings by adding carbon fiber and boron nitride toughening agent to the powder coating premix and performing high-speed dispersion treatment, making the powder coatings more suitable for surface protection of grain machinery.

[0065] The twin-screw extrusion process used to prepare the powder coating ensures uniform distribution and full reaction of all components, improving the overall performance and stability of the powder coating. Furthermore, plasma surface treatment technology forms a polar group-modified layer on the powder coating surface, further enhancing the bonding and adhesion between the coating and the substrate.

[0066] This method ensures the quality stability and reliability of the final product through strict quality testing procedures, including testing of multiple indicators such as particle size distribution, fluidity, melt index and wear resistance, meets the strict requirements of grain machinery for coating wear resistance, extends the service life of the equipment and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 Schematic diagram of the process of the wear resistance quality control method of the powder coating for grain machinery according to the embodiment of the present invention;

[0068] Figure 2This is a schematic diagram of the concentration distribution of local samples after mixing the epoxy grain machinery wear-resistant coating according to an embodiment of the present invention;

[0069] Figure 3 This is a complete process flow chart for obtaining a surface-modified powder coating premix according to an embodiment of the present invention. DETAILED DESCRIPTION

[0070] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0071] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0072] Figure 1 FIG. 1 is a flow chart of a method for controlling the wear resistance of a powder coating for grain machinery according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0073] Adding a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stirring and mixing the epoxy grain machinery wear-resistant coating to ensure that the epoxy grain machinery wear-resistant coating is fully mixed to obtain a powder coating premix;

[0074] Adding carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing, and performing shear dispersion treatment on the carbon fiber and the boron nitride toughening agent using a high-speed disperser so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix to obtain a toughened powder coating premix;

[0075] conveying the toughened powder coating premix to a twin-screw extruder for extrusion to obtain a molten powder coating; cooling the temperature of the molten powder coating to room temperature to obtain a solid powder coating;

[0076] A mixed gas of oxygen and argon is introduced into the solid powder coating, and a plasma generator is started to generate plasma to react with the solid powder coating on the surface, thereby forming a modified layer having polar groups on the surface of the solid powder coating to obtain a modified powder coating premix;

[0077] The modified powder coating premix is subjected to quality inspection, and the inspection items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified by the preset standard, the preparation of the special powder coating for grain machinery is completed.

[0078] In an optional embodiment, a predetermined ratio of epoxy grain machinery wear-resistant coating is added to a stirring tank, and the epoxy grain machinery wear-resistant coating is stirred and mixed to make the epoxy grain machinery wear-resistant coating fully mixed to obtain a powder coating premix, which includes:

[0079] Adding a predetermined ratio of epoxy grain machinery wear-resistant coating to the stirring tank, and setting a plurality of sensing detection devices on the inner wall of the stirring tank, wherein the plurality of sensing detection devices include a viscosity sensor, a temperature sensor and a conductivity sensor, and the plurality of sensing detection devices respectively collect viscosity data, temperature data and conductivity data of the epoxy grain machinery wear-resistant coating;

[0080] A plurality of sampling ports are provided at different positions of the stirring tank, and local samples of the epoxy grain machinery wear-resistant coating are collected through the plurality of sampling ports to obtain local sampling concentrations of the local samples;

[0081] Calculating a mixing uniformity index based on the local sampling concentration, and stopping stirring when the mixing uniformity index reaches a preset range; performing fluorescent tracing detection on the epoxy grain machinery wear-resistant coating after stirring to obtain a flow field distribution diagram of the epoxy grain machinery wear-resistant coating, and judging the mixing uniformity of the epoxy grain machinery wear-resistant coating based on the flow field distribution diagram;

[0082] When the mixing uniformity of the epoxy grain machinery wear-resistant coating meets the preset conditions, the stirred epoxy grain machinery wear-resistant coating is output to the next process to obtain a powder coating premix.

[0083] A 200-liter stainless steel mixing tank was prepared. Twelve sensing devices were installed on the inner wall of the tank, including four viscosity sensors, four temperature sensors, and four conductivity sensors. The viscosity sensors had a measurement range of 0.1-10,000 mPa·s with an accuracy of ±1%; the temperature sensors had a measurement range of -50°C to 250°C with an accuracy of ±0.5°C; and the conductivity sensors had a measurement range of 0-100 mS / cm with an accuracy of ±0.5%. These sensors were installed in a spiral pattern at the top, upper middle, lower middle, and bottom of the tank to ensure comprehensive monitoring of the coating parameters within the tank.

[0084] Epoxy resin (70wt%), curing agent (15wt%), filler (10wt%), and additives (5wt%) were added to a stirred tank according to the predetermined ratio. The epoxy resin used was bisphenol A epoxy resin, brand E-44, with an epoxy value of 0.44; the curing agent was diaminodiphenylmethane (DDM); the filler was a mixture of titanium dioxide and barium sulfate; and the additives included a dispersant, defoamer, and leveling agent.

[0085] Start the stirring device, set the stirring speed to 120 rpm, and initially set the stirring time to 30 minutes. During the stirring process, the viscosity sensor collects data every 5 seconds to record the viscosity changes of the epoxy grain machinery wear-resistant coating; the temperature sensor collects data every 10 seconds to monitor the temperature changes of the coating; and the conductivity sensor collects data every 15 seconds to understand the dispersion state of the coating components. This data is transmitted to the control system through the data acquisition module and displayed in real time on the monitoring interface.

[0086] Sampling ports, each 10 mm in diameter, were located at the top, upper middle, middle, lower middle, and bottom of the stirred tank. Each port was connected to an automatic sampling device. A total of 25 5 mL paint samples were collected from each port at 5, 10, 15, 20, and 25 minutes after the start of stirring. The collected samples were immediately fed into an online analyzer for component analysis, obtaining local concentration data at each sampling point.

[0087] The mixing uniformity index is calculated based on the local sampling concentration data. Specifically, the coefficient of variation is calculated by dividing the standard deviation of the concentrations at all sampling points by the average concentration. When the coefficient of variation is less than 0.05, the mixing uniformity index is considered to have reached the preset range, and stirring can be stopped. In this example, after 22 minutes of stirring, the measured coefficient of variation was 0.047, meeting the preset standard, at which point stirring was stopped.

[0088] After stirring, a fluorescent tracer, sodium fluorescein solution (0.1wt%), was added to the coating in an amount equal to 0.01wt% of the total coating mass. After thorough mixing for 3 minutes, the coating in the stirred tank was scanned using a laser-induced fluorescence (LIF) imaging system. The LIF system is equipped with an argon ion laser with a wavelength of 488nm as the excitation light source, and a high-speed CCD camera with a bandpass filter (510-530nm) is used to capture the fluorescence signal. By controlling the three-dimensional motion mechanism on the platform, the laser plane can scan the coating in the tank at different heights, obtaining multi-layer fluorescence intensity distribution images.

[0089] The acquired fluorescence intensity distribution image is processed using image processing software to generate a flow field distribution map of the coating. This map shows the distribution of each component in the coating, and mixing uniformity is determined by analyzing the coefficient of variation of the fluorescence intensity. In this example, the coefficient of variation of the fluorescence intensity in the flow field distribution map is 0.039, which is less than the preset threshold of 0.05, indicating that the epoxy grain machinery wear-resistant coating is fully mixed.

[0090] After confirming that the mixing uniformity of the epoxy grain machinery wear-resistant coating meets the preset conditions, open the discharge valve at the bottom of the stirring tank to transport the coating to the storage tank of the next process to complete the preparation of the powder coating premix.

[0091] The specific steps for adding carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing are as follows: the prepared powder coating premix is conveyed to a high-speed disperser, and short-cut carbon fiber (fiber length 3mm, diameter 7μm) and hexagonal boron nitride powder (purity ≥99.5%, particle size 0.5-1.0μm) are added. The amount of carbon fiber added is 2.5wt% of the premix weight, and the amount of boron nitride added is 1.5wt% of the premix weight, with a mass ratio of carbon fiber to boron nitride of 5:3.

[0092] The high-speed disperser had a rotor diameter of 200 mm and a rotor-stator gap of 0.5 mm. The disperser speed was set at 3000 rpm, and the dispersion time was set for 15 minutes. During the dispersion process, the material temperature was kept below 60°C, and samples were collected every 5 minutes to monitor the dispersion state. After 15 minutes of high-speed dispersion, the carbon fibers and boron nitride toughening agent were evenly distributed throughout the powder coating premix, with no apparent agglomeration, resulting in a toughened powder coating premix.

[0093] The toughened powder coating premix was fed into a twin-screw extruder for extrusion using a 36mm screw diameter, a 40:1 aspect ratio, and five heating zones and a water-cooling zone. The toughened powder coating premix was evenly fed into the extruder hopper via a metered feeder at a controlled rate of 30kg / h.

[0094] The extruder section temperatures were set at 160°C (first section), 175°C (second section), 185°C (third section), 180°C (fourth section), and 170°C (fifth section). The die temperature was set at 165°C. The extruder motor speed was set at 200 rpm, and the screw was configured with alternating conveying and shearing elements to improve material uniformity and dispersion. The material residence time in the extruder was approximately 2 minutes, and the pressure at exiting the die was 4.5 MPa, resulting in a molten powder coating.

[0095] The molten powder coating is cooled to room temperature (approximately 25°C) via a water-cooled drum. The cooling rate is controlled at 15°C / minute to prevent excessive crystallization or thermal stress concentration in the coating. The cooled coating is initially crushed in a crusher and then finely ground in a pulverizer to obtain a solid powder coating with a particle size of 30-60μm.

[0096] The specific steps for plasma treatment of solid powder coating by introducing a mixture of oxygen and argon are as follows: The solid powder coating is evenly spread on a treatment tray with an area of 0.5 m² and a coating thickness of 2 mm. The tray is placed in the plasma treatment chamber, which is evacuated to 50 Pa. Then, a mixture of oxygen and argon is introduced at a flow rate of 50 sccm oxygen and 150 sccm argon, with a volume ratio of 1:3.

[0097] The RF plasma generator was activated, set to 300W power and 13.56MHz frequency, and the treatment time was 10 minutes. The plasma reacted with the surface of the solid powder coating, introducing polar groups such as hydroxyl and carboxyl groups, forming a modified layer approximately 50-100nm thick. X-ray photoelectron spectroscopy (XPS) analysis showed that the surface oxygen content increased from 2.3% to 8.7%, indicating a significant increase in the density of surface polar groups.

[0098] The particle size distribution of the powder coating was determined by a laser particle size analyzer, with D10=32μm, D50=45μm, and D90=58μm, indicating a narrow and concentrated particle size distribution. The fluidity of the powder coating was determined by a Hall flow meter, with a flow rate of 35g / 50s, meeting the requirement for good fluidity. The melt index was determined by a melt flow rate meter, which was 26g / 10min (190°C, 2.16kg). The wear resistance was determined by a Taber abrader, with a CS-17 grinding wheel, a load of 1000g, and a mass loss of 15mg after 1000 revolutions, meeting the preset standard requirements (≤20mg).

[0099] Figure 2 This is a schematic diagram of the concentration distribution of local samples after mixing the epoxy grain machinery wear-resistant coating according to an embodiment of the present invention:

[0100] Analysis of the data shown in the chart reveals significant differences in the finished product yields of the three technical solutions at different sampling locations (upper layer A, upper layer B, middle layer A, middle layer B, lower layer A, lower layer B, and center). The innovative continuous twin-screw compounding technology employed by the present technical solution, through optimized screw assembly design, precise temperature control, and advanced material conveying mechanisms, maintained a high finished product yield of 96.8%-97.5% at all sampling locations, reaching a peak of 97.5% at middle layer A. Traditional method A, "unidirectional spiral feed extrusion" (using a single-screw extruder with unidirectional material conveying along the spiral direction), performed second best, with finished product yields fluctuating between 95.5% and 96.3%, reaching a peak of 96.3% at the center. Traditional method B, "conventional batch mixing" (using conventional batch mixing equipment and a batch production method), performed the worst, with finished product yields ranging from only 94.5% to 95.3%, reaching a low of 94.5% at middle layer B. Judging from the data fluctuation trend, this technical solution not only has a higher overall finished product yield, but also has more stable performance at each sampling location. This fully demonstrates the significant advantages of this solution in terms of product quality uniformity and stability, especially in the middle layer area, where it exhibits the best process effect, far exceeding the traditional unidirectional spiral feeding extrusion method and conventional intermittent mixing method.

[0101] The preparation process of powder coatings for grain machinery in the existing technology usually relies on manual experience to judge the mixing uniformity, lacks accurate monitoring methods, and leads to large fluctuations in the quality of the coatings. At the same time, traditional coating surface modification methods mostly use chemical treatment, which is not only inefficient but also causes environmental pollution problems. The starting point of the improvement of this application is to solve the problems of inaccurate mixing uniformity judgment and unstable surface modification effect in the existing technology. By setting multiple sensors in the stirring tank to monitor the coating parameters in real time, the mixing uniformity is accurately judged by combining multi-point sampling and fluorescence tracing technology; at the same time, plasma technology is used to modify the coating surface, and polar groups are introduced to improve the adhesion and wear resistance of the coating to the substrate. Experimental results show that the powder coating prepared by this method has a narrower particle size distribution, better fluidity and higher wear resistance. In actual application, the wear resistance of the coating is improved by 35%, and the service life is extended by 40%, which significantly improves the performance and maintenance cycle of grain machinery and equipment.

[0102] In an optional embodiment, carbon fiber and a boron nitride toughening agent are added to the uniformly mixed powder coating premix for secondary mixing, and the carbon fiber and the boron nitride toughening agent are sheared and dispersed using a high-speed disperser so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix. The toughened powder coating premix comprises:

[0103] Adding carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix, and performing shear dispersion treatment on the carbon fiber and the boron nitride toughening agent using a high-speed disperser, wherein the high-speed disperser is provided with a temperature sensor and a shear force sensor, and the dispersion temperature and shear stress of the carbon fiber and the boron nitride toughening agent are monitored in real time by the temperature sensor and the shear force sensor;

[0104] Inert gas is introduced into the high-speed disperser, and polar functional groups formed on the surface of the carbon fiber are treated by plasma in the inert gas environment to increase the surface free energy of the carbon fiber;

[0105] Adding a powder coating premix to the high-speed disperser, co-dispersing the powder coating premix with the carbon fiber and the boron nitride toughening agent, and forming a three-dimensional network structure under the dispersing action of the high-speed disperser;

[0106] Setting a plurality of sampling detection points at different positions of the three-dimensional network structure, collecting samples at the sampling detection points, and measuring the dispersed particle size distribution of the carbon fiber and the boron nitride toughening agent in the samples using a laser particle size analyzer;

[0107] The dispersed powder coating premix is subjected to a stress-strain test and a fracture toughness test to obtain the Young's modulus and the critical strain energy release rate of the powder coating premix; when the Young's modulus and the critical strain energy release rate meet the preset requirements, the powder coating premix is transported to a subsequent process for processing to obtain a toughened powder coating premix.

[0108] Carbon fiber and boron nitride toughening agent are added to a uniformly mixed powder coating premix. The carbon fiber and boron nitride toughening agent are then shear-dispersed using a GFJ-5 high-speed disperser with a 200mm rotor diameter and an adjustable rotor-stator gap of 0.1-2.0mm. A PT100 temperature sensor with a measurement range of -50°C to 200°C and an accuracy of ±0.1°C is installed inside the disperser tank. A JY-2 shear force sensor with a measurement range of 0-5000N and an accuracy of ±0.5% is also installed. These sensors are connected to the control system via a data acquisition module with a sampling frequency of 2Hz to monitor temperature changes and shear stress during the dispersion process in real time.

[0109] Before dispersion, PAN-based carbon fibers with a diameter of 7 μm and a length of 3 mm were selected, with a purity greater than 99% and a tensile strength of 3500 MPa. Hexagonal boron nitride powder with a purity greater than 99.5%, an average particle size of 0.8 μm, and a thermal conductivity of 33 W / (m·K) was selected. The carbon fibers and boron nitride toughening agent were mixed in a mass ratio of 3:2, with a total addition amount of 4 wt% of the powder coating premix.

[0110] The high-speed disperser was set to 2500 rpm, and the stator-rotor gap was adjusted to 0.5 mm. After starting the disperser, high-purity argon gas (≥99.999%) was introduced through the air inlet at a controlled flow rate of 500 mL / min to create an inert atmosphere within the disperser. Air within the tank was expelled, and the oxygen content was reduced to below 0.1%. Within this inert atmosphere, the accompanying plasma treatment device was activated, with the plasma generator power set to 200 W and the frequency set to 40 kHz. Oxygen was used as the plasma gas at a flow rate of 50 mL / min. The plasma treatment lasted for 5 minutes, forming polar functional groups such as hydroxyl and carboxyl groups on the carbon fiber surface. X-ray photoelectron spectroscopy (XPS) analysis showed that the surface oxygen content of the treated carbon fibers increased from 2.1% to 7.8%, and the surface free energy increased from 42 mJ / m² to 68 mJ / m².

[0111] After the plasma treatment is complete, the prepared powder coating premix is added to the high-speed disperser through the feed port at a controlled rate of 2 kg / min. The main components of the powder coating premix are epoxy resin (70wt%), curing agent (15wt%), filler (10wt%), and additives (5wt%). The disperser is maintained at 1800 rpm during the addition process to ensure thorough contact and mixing of the coating with the carbon fiber and boron nitride.

[0112] After all materials were added, the disperser speed was increased to 3000 rpm for high-intensity shear dispersion. During the dispersion process, the temperature monitored by the temperature sensor gradually increased from room temperature to 55°C, and the temperature was controlled to not exceed 60°C by jacket cooling water. The shear force sensor monitored the shear stress peak at 3800N, with an average value stable at around 3200N. The dispersion time was set for 20 minutes. During this process, the carbon fiber and boron nitride toughening agent were evenly dispersed in the powder coating premix under high shear force, forming a stable three-dimensional network structure.

[0113] In order to detect the dispersion effect, five sampling points were set at different positions of the three-dimensional network structure, namely the upper, upper middle, middle, lower middle and bottom parts. About 5g of sample was collected from each detection point by a special sampling device and immediately stored in a sealed container. The dispersed particle size distribution of carbon fiber and boron nitride toughening agent in the sample was determined using a Malvern Mastersizer 3000 laser particle size analyzer. The measurement results showed that the D50 values of the five sampling points were 2.8μm, 3.1μm, 2.9μm, 3.0μm and 3.2μm, respectively, with a coefficient of variation of 0.048, indicating good dispersion uniformity.

[0114] After dispersion, a portion of the sample was removed to prepare standard specimens for stress-strain and fracture toughness testing. The stress-strain test was conducted using an MTS E45.105 universal testing machine at a tensile rate of 5 mm / min. The measured Young's modulus was 3.8 GPa, a 52% increase compared to the 2.5 GPa of the sample without the toughening agent. The fracture toughness test was conducted using a three-point bending method using pre-cracked standard specimens. The critical strain energy release rate was 1.25 kJ / m², an 83.8% increase compared to the 0.68 kJ / m² of the sample without the toughening agent.

[0115] The test results show that both the Young's modulus and critical strain energy release rate meet the preset requirements (Young's modulus ≥ 3.5 GPa, critical strain energy release rate ≥ 1.0 kJ / m²). At this point, the dispersed powder coating premix is discharged through the discharge valve and transported to subsequent processing steps to obtain a toughened powder coating premix.

[0116] During the implementation process, it was found that the ratio of carbon fiber and boron nitride toughening agent has a significant influence on the toughening effect. When the mass ratio of carbon fiber to boron nitride is 3:2, the best toughening effect can be obtained; when the ratio deviates from this value, the Young's modulus and critical strain energy release rate both decrease. In addition, the plasma treatment time is also a key factor affecting the toughening effect. Too short a treatment time will lead to insufficient generation of polar functional groups on the surface of the carbon fiber, affecting its interfacial compatibility with the epoxy resin; too long a treatment time may cause excessive oxidation of the carbon fiber surface, affecting its mechanical properties. Through comparative experiments, it was determined that a plasma treatment time of 5 minutes can achieve the best surface modification effect.

[0117] The toughened powder coating premix prepared using this technique exhibits excellent mechanical properties and dispersion stability. Microscopic observation reveals that the carbon fibers and boron nitride toughening agent form an interwoven three-dimensional network structure, effectively preventing crack propagation and improving the material's impact and wear resistance. After thermal cycling testing (50 cycles from -40°C to 120°C), the sample's mechanical property retention exceeded 95%, demonstrating the material's excellent thermal stability and durability.

[0118] In an optional embodiment, adding a powder coating premix to the high-speed disperser, co-dispersing the powder coating premix with the carbon fiber and the boron nitride toughening agent, and forming a three-dimensional network structure under the dispersion action of the high-speed disperser comprises:

[0119] adding a powder coating premix into the high-speed disperser, performing a shear rheology test on the powder coating premix at different shear rates to obtain the shear stress of the powder coating premix at the different shear rates;

[0120] establishing a rheological curve according to the corresponding relationship between the shear stress and the shear rate, obtaining the zero shear viscosity and infinite shear viscosity of the powder coating premix through the rheological curve, and determining an optimal shear rate range based on the zero shear viscosity and the infinite shear viscosity;

[0121] Within the optimal shear rate range, adding carbon fiber and a boron nitride toughening agent to the powder coating premix, applying an electrostatic field and spraying a surfactant during the dispersion process of the high-speed disperser, and offsetting the van der Waals force between the carbon fiber and the boron nitride toughening agent by the electrostatic force generated by the electrostatic field and the steric resistance generated by the surfactant;

[0122] Measuring the volume fractions of the carbon fiber and the boron nitride toughening agent, calculating a mixing entropy change according to the volume fractions, and adjusting the ratio of the carbon fiber and the boron nitride toughening agent based on the calculated result of the mixing entropy change so that the mixing entropy change reaches a maximum value;

[0123] The calculation result of the hybrid entropy change is subjected to synchrotron radiation small-angle scattering analysis to obtain a scattering vector and a radial distribution function of the calculation result of the hybrid entropy change, and a three-dimensional network structure is obtained by weighted calculation based on the scattering vector and the radial distribution function.

[0124] Add a powder coating premix to a high-speed disperser. In this embodiment, the powder coating premix includes an epoxy resin, a curing agent, a filler, and additives. The epoxy resin is bisphenol A epoxy resin, the curing agent is dicyandiamide, the filler is calcium carbonate, and the additives include a leveling agent and a defoamer. These components are mixed in a weight ratio of 70:15:10:5 to obtain a powder coating premix.

[0125] Shear rheology tests were performed on the powder coating premix at different shear rates to determine the shear stress of the powder coating premix at these rates. Specifically, a rotational rheometer was used to measure the shear stress of the powder coating premix at 25°C at shear rates of 0.1, 0.5, 1, 5, 10, 50, 100, 500, 1000, and 5000 s⁻¹. For example, at a shear rate of 0.1 s⁻¹, the measured shear stress was 10 Pa; at a shear rate of 5000 s⁻¹, the measured shear stress was 2500 Pa.

[0126] A rheological curve was established based on the corresponding relationship between shear stress and shear rate. The zero-shear viscosity and infinite-shear viscosity of the powder coating premix were obtained through rheological curve fitting analysis. In this example, the zero-shear viscosity was 100 Pa·s, and the infinite-shear viscosity was 0.5 Pa·s. Based on the zero-shear viscosity and infinite-shear viscosity, the optimal shear rate range was determined to be 500-1500 s^-1. Within this range, the powder coating premix exhibited significant shear-thinning behavior, which facilitated the uniform dispersion of the carbon fiber and boron nitride toughening agent.

[0127] Add carbon fiber and a boron nitride toughening agent to the powder coating premix. The carbon fiber is chopped short-cut carbon fiber with a length of 5-10 μm and a diameter of 7-9 μm. The boron nitride toughening agent is hexagonal boron nitride with a particle size of 1-3 μm. The initial ratio is 5 parts by weight of carbon fiber to 3 parts by weight of boron nitride toughening agent.

[0128] An electrostatic field was simultaneously applied and a surfactant was sprayed. The electrostatic field strength was set to 5 kV / cm, and polyoxyethylene sorbitol was used as the surfactant, sprayed evenly at a concentration of 0.5%. The electrostatic force generated by the electrostatic field and the steric resistance created by the surfactant effectively offset the van der Waals forces between the carbon fibers and the boron nitride toughening agent, preventing them from agglomerating. The dispersion time was 30 minutes, and the rotation speed was set to 1000 rpm, corresponding to a shear rate of approximately 1200 s^-1, which is within the optimal shear rate range.

[0129] Samples were taken every five minutes to measure the volume fractions of the carbon fibers and boron nitride toughening agent. The content of each component in the sample was determined using a thermogravimetric analyzer and then converted to volume fraction based on density. For example, after 15 minutes of dispersion, the volume fraction of the carbon fibers was 3.2%, and the volume fraction of the boron nitride toughening agent was 1.8%.

[0130] The mixing entropy change is calculated based on the measured volume fraction. The mixing entropy change reflects the uniformity of the dispersion of the carbon fiber and the boron nitride toughening agent in the system. The larger the mixing entropy change, the more uniform the dispersion. According to the calculation results, the ratio of the carbon fiber and the boron nitride toughening agent is adjusted. In this embodiment, after multiple attempts, when the weight ratio of the carbon fiber to the boron nitride toughening agent is 6:4, the mixing entropy change reaches a maximum value of 0.85, indicating that the dispersion is most uniform at this time.

[0131] The calculated results of the mixing entropy change were analyzed using synchrotron radiation small-angle X-ray scattering. The sample was sent to a synchrotron radiation source for small-angle X-ray scattering, which measured the scattering vector q and the radial distribution function g(r). In this example, the scattering vector q ranged from 0.01 to 0.5 Å^-1, and the radial distribution function g(r) exhibited a significant peak in the range of r = 5-10 nm, indicating the formation of a nanoscale network structure.

[0132] A weighted calculation based on the scattering vector and radial distribution function yielded the characteristic parameters of the three-dimensional network structure. The calculation results showed that the resulting three-dimensional network structure exhibited the following characteristics: a network node density of 2.3×10^15 cells / cm^3, an average mesh size of 25 nm, and a network connectivity of 0.92. This three-dimensional network structure, composed of carbon fibers as the skeleton and boron nitride toughening agents as the nodes, formed a composite reinforcement system with high strength and toughness.

[0133] The powder coating prepared using this method exhibited an 85% increase in impact strength, a 62% increase in abrasion resistance, and a 45% increase in thermal conductivity compared to a control sample without carbon fiber and boron nitride toughening agents, while maintaining good surface finish and decorative properties. This demonstrates that the resulting three-dimensional network structure significantly enhances the performance of powder coatings.

[0134] In an optional embodiment, a mixed gas of oxygen and argon is introduced into the solid powder coating, a plasma generator is activated to generate plasma to react with the solid powder coating on the surface, and a modified layer having polar groups is formed on the surface of the solid powder coating to obtain a modified powder coating premix, comprising:

[0135] Passing a mixed gas of oxygen and argon into the solid powder coating, controlling the flow rate of the oxygen to be smaller than the flow rate of the argon, so that the mixed gas forms a uniform atmosphere in the solid powder coating;

[0136] In the uniform atmosphere, the solid powder coating is evenly spread on the stage at the bottom of the reaction chamber, wherein the thickness of the solid powder coating is less than one quarter of the height of the stage;

[0137] The reaction chamber is evacuated to a preset vacuum degree, and then the mixed gas is introduced to make the working pressure of the reaction chamber reach the preset pressure, and the reaction chamber is left to stand for pretreatment;

[0138] Starting a plasma generator to generate plasma, adjusting the output power of the plasma generator to a first preset power, and controlling the discharge distance between the plasma and the solid powder coating to reach a preset distance;

[0139] The oxygen in the mixed gas is ionized under the action of the plasma to form active oxygen, and the active oxygen chemically reacts with the surface of the solid powder coating to form a modified layer containing polar groups on the surface of the solid powder coating;

[0140] According to the growth of the modified layer, adjusting the output power of the plasma generator to a second preset power, and controlling the modified layer to grow uniformly to a preset thickness;

[0141] Adjusting the power density of the plasma generator to control the polar groups to form a uniform distribution in the modified layer so that the surface density of the polar groups reaches a preset density;

[0142] The polar group density on the surface of the solid powder coating is monitored. When the rate of change of the polar group density measured multiple times in succession is less than a preset change threshold, the plasma generator is turned off and the mixture is cooled to room temperature to obtain a surface-modified powder coating premix.

[0143] A mixture of oxygen and argon is introduced into the solid powder coating. The oxygen flow rate is controlled to be smaller than the argon flow rate, for example, the oxygen to argon flow ratio is 1:3. This creates a uniform atmosphere within the solid powder coating.

[0144] The solid powder coating is evenly spread on the stage at the bottom of the reaction chamber. The thickness of the solid powder coating should be less than one-quarter of the stage height. For example, if the stage height is 10 cm, the thickness of the powder coating should not exceed 2.5 cm. This ensures that the plasma can evenly affect the powder coating surface.

[0145] Evacuate the reaction chamber to a preset vacuum level, such as 10-3 Pa. Then, introduce a mixed gas to bring the reaction chamber's operating pressure to a preset level, such as 50 Pa. Allow to stand for 5-10 minutes to allow the gas to be evenly distributed within the chamber.

[0146] The plasma generator is activated to generate plasma, and the output power is adjusted to a first preset power, for example, 100 W. The discharge distance between the plasma and the solid powder coating is controlled to a preset distance, for example, 5 cm. The oxygen in the mixed gas is ionized by the plasma to form active oxygen species, which chemically react with the surface of the solid powder coating, forming a modified layer containing polar groups on the powder coating surface.

[0147] Based on the growth of the modified layer, adjust the output power of the plasma generator to a second preset power, such as 150 W. Control the uniform growth of the modified layer to a preset thickness, such as 100 nm. Changes in the thickness of the modified layer can be monitored using in-situ ellipsometers.

[0148] Adjust the power density of the plasma generator, for example, to 2 W / cm², to ensure a uniform distribution of polar groups within the modified layer. This allows the surface density of polar groups to reach a predetermined value, for example, 1015 groups / cm². The surface polar group density can be measured using X-ray photoelectron spectroscopy (XPS).

[0149] Continuously monitor the polar group density on the surface of the solid powder coating. When the rate of change in the polar group density over multiple consecutive measurements (e.g., five consecutive times) is less than a preset threshold (e.g., 1%), the modified layer has reached a stable state. At this point, turn off the plasma generator and cool to room temperature to obtain the surface-modified powder coating premix.

[0150] Taking epoxy resin powder coating as an example, first, evenly spread 100g of epoxy resin powder coating on the stage at the bottom of the reaction chamber to a thickness of 2cm. Evacuate the reaction chamber to 10-3Pa. Then, introduce a mixture of oxygen and argon at a flow rate of 20sccm oxygen and 60sccm argon to bring the chamber's operating pressure to 50Pa. Allow the mixture to stand for 5 minutes for preconditioning.

[0151] The plasma generator was activated with an initial output power of 100W, and the discharge distance between the plasma and the powder coating was controlled to be 5cm. The oxygen in the mixed gas was ionized to form reactive oxygen species, which reacted with the surface of the epoxy resin powder, forming a modified layer containing polar groups such as hydroxyl and carboxyl groups.

[0152] The thickness of the modified layer was monitored using in-situ ellipsometers. When the modified layer reached 50 nm, the plasma generator output power was adjusted to 150 W to promote further growth. Simultaneously, the power density was increased to 2 W / cm² to ensure uniform distribution of the polar groups within the modified layer.

[0153] Continuously monitor the surface polar group density. When the rate of change in the XPS results for five consecutive measurements is less than 1%, turn off the plasma generator. The entire treatment process lasts 30 minutes. Slowly cool the reaction chamber to room temperature to obtain the surface-modified epoxy resin powder coating premix.

[0154] XPS analysis revealed that the surface polar group density of the modified epoxy resin powder reached 1.2 × 10⁻¹⁵ cells / cm², and the modified layer thickness was 100 nm. Compared to unmodified epoxy resin powder, the modified powder coating exhibited improved dispersibility and adhesion. Under the same spraying conditions, the modified powder coating exhibited a 30% increase in adhesion to the metal substrate, significantly improving the coating surface quality.

[0155] The method of the present invention achieves uniform surface modification of solid powder coatings by precisely controlling various parameters during the plasma treatment process. By adjusting parameters such as the mixed gas ratio, plasma power, and treatment time, the thickness and polar group density of the modified layer can be flexibly controlled to meet the needs of different application scenarios. This method is simple to operate, readily adaptable to industrial production, and has promising application prospects.

[0156] It should be noted that the above embodiment is only one preferred embodiment of the present invention, and those skilled in the art may make modifications and variations without departing from the technical solution of the present invention. For example, plasma treatment parameters may be adjusted according to different types of powder coatings; other reactive gases (such as nitrogen or carbon monoxide) may be used to replace or partially replace oxygen; and different plasma sources (such as radio frequency plasma or microwave plasma) may be used. Such variations are intended to fall within the scope of protection of the present invention.

[0157] Figure 3 The complete process flow chart for obtaining a surface-modified powder coating premix according to an embodiment of the present invention is as follows:

[0158] This flow chart illustrates the complete process flow for plasma coating surface modification. The entire process begins with plasma treatment of the solid powder coating surface. A gas mixture of oxygen and helium is then introduced, with oxygen flow rates controlled at 5-15 sccm and helium flow rates at 30-50 sccm. The solid powder coating is then evenly applied to the stage within the reaction chamber, reaching a thickness approximately one-quarter of the stage's height. After evacuation to a preset vacuum level, the gas mixture is introduced to a preset pressure, followed by a static pretreatment. The plasma generator is then activated to generate plasma, and treatment is performed by adjusting the output power and controlling the discharge distance. During this process, oxygen is ionized to form reactive oxygen species, which form a modified layer of polar groups on the powder coating surface. Depending on the growth of the modified layer, the power is adjusted to a second preset level to ensure a uniform distribution of polar groups to a preset thickness. By adjusting the power density and controlling the distribution of polar groups, the surface density of polar groups is maintained at a preset value. If the rate of change in polar group density is less than a preset threshold, plasma treatment continues. If it reaches the threshold, the plasma generator is shut down and the mixture is cooled to room temperature, ultimately yielding a surface-modified powder coating premix. The entire process emphasizes precise parameter control and real-time monitoring and adjustment to ensure the effectiveness of the surface modification treatment.

[0159] In an optional embodiment, the oxygen in the mixed gas is ionized under the action of the plasma to form active oxygen, and the active oxygen chemically reacts with the surface of the solid powder coating to form a modified layer containing polar groups on the surface of the solid powder coating, which includes:

[0160] In a plasma environment, the oxygen in the mixed gas is ionized to form active oxygen;

[0161] Controlling the active oxygen to chemically react with the surface of the solid powder coating to form chemically bonded polar groups on the surface of the solid powder coating;

[0162] The polar groups gradually grow on the surface of the solid powder coating to form a modified layer, and the polar groups in the modified layer are distributed in a gradient from the surface to the inside.

[0163] Prepare a plasma treatment apparatus consisting of a vacuum chamber, gas supply system, plasma generator, and sample stage. Evenly spread the solid powder coating on the sample stage to a thickness of 1-2 mm. Close the vacuum chamber and use a vacuum pump to evacuate the chamber to a base vacuum of 0.1-1 Pa.

[0164] A gas mixture is introduced into the vacuum chamber via a gas supply system. This gas mixture consists of oxygen and an inert gas, with the oxygen ratio ranging from 10% to 50% by volume. The inert gas can be argon or helium. For example, a mixture of 30% oxygen and 70% argon can be used, with a total flow rate of 50-200 sccm (standard cubic centimeters per minute).

[0165] The plasma generator is activated to generate radio frequency or microwave plasma. The plasma power can be set between 50 and 500 W, and the frequency can be selected from 13.56 MHz or 2.45 GHz. Under the action of the plasma, the oxygen molecules in the mixed gas are ionized and dissociated, forming reactive oxygen species including oxygen ions, oxygen atoms, and excited oxygen molecules.

[0166] Controlling the plasma treatment time and temperature is crucial. Treatment times typically range from 30 seconds to 10 minutes, depending on the desired degree of modification. The treatment temperature should be maintained within the 50-150°C range to avoid melting or decomposition of the solid powder coating. This temperature can be controlled by adjusting the sample stage's cooling system.

[0167] During the plasma treatment process, reactive oxygen species chemically react with the surface of the solid powder coating. These reactions primarily include oxidation, hydroxylation, and carboxylation. For example, reactive oxygen species can react with carbon-hydrogen bonds on the coating surface to form oxygen-containing polar groups such as hydroxyl (-OH) or carboxyl (-COOH). These polar groups are firmly bonded to the coating surface through covalent bonds, forming a chemically bonded modified layer.

[0168] The formation of the modified layer is a dynamic process. Initially, the active oxygen reacts primarily with molecules in the outermost layer of the coating, forming the first layer of polar groups. As treatment time increases, the active oxygen gradually penetrates deeper into the coating, reacting with molecules in deeper layers. This results in a gradient distribution of polar groups across the coating surface, from the surface to the interior. Typically, the modified layer can be 10-100 nanometers thick, depending on treatment conditions and coating properties.

[0169] To optimize the treatment effect, pulsed plasma technology can be used. For example, the plasma can be turned on for 1-10 seconds and off for 0.5-5 seconds, repeated multiple times. This method can reduce heat accumulation while allowing the active species sufficient time to fully react with the coating surface.

[0170] After the treatment is completed, the vacuum chamber is slowly filled with dry nitrogen or air to return the pressure inside the chamber to normal pressure. When the solid powder coating is taken out after treatment, it can be observed that the color of the coating may change slightly, which is caused by the change in the surface chemical composition.

[0171] A drop of water is dropped onto a sheet sample pressed from the coating before and after treatment, and the contact angle is measured. Generally, the contact angle of the treated sample decreases significantly, for example, from 80° to 30°, indicating that the surface hydrophilicity has significantly increased. Changes in the surface elemental composition are detected. After treatment, the oxygen content usually increases by 5%-20%, and the appearance of new chemical bonds such as CO and C=O can be observed. The characteristic absorption peaks of newly generated functional groups such as -OH and -COOH can be detected. Changes in surface morphology can be observed, and the surface roughness usually increases slightly after treatment, but the increase usually does not exceed 10 nm.

[0172] The surface energy of solid powder coatings treated with the above method is significantly increased, typically from 20-30 mJ / m² to 40-60 mJ / m². This modification not only improves the coating's wettability and adhesion, but also enhances its compatibility with other materials, providing a good foundation for subsequent coating processes.

[0173] The plasma treatment parameters need to be optimized depending on the specific coating type and the desired degree of modification. For example, for polyester powder coatings, a lower power (e.g., 100 W) and a shorter treatment time (e.g., 2 minutes) may be required, while for epoxy powder coatings, a higher power (e.g., 300 W) and a longer treatment time (e.g., 5 minutes) may be required.

[0174] To ensure consistent treatment results, it is recommended to regularly clean the plasma treatment apparatus, especially the electrodes and sample stage. This can be done by wiping with isopropyl alcohol or ethanol and then blowing dry with dry nitrogen. Also, the gas filter should be regularly checked and replaced to ensure gas purity.

[0175] In an optional embodiment, the modified powder coating premix is subjected to quality testing, wherein the testing items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified by a preset standard, the preparation of the powder coating for grain machinery is completed, which includes:

[0176] The modified powder coating premix is subjected to a particle size distribution measurement to obtain a particle distribution parameter of the powder coating premix, and a particle size uniformity coefficient of the powder coating premix is calculated by dividing the standard deviation of the particle distribution parameter by the average particle size and multiplying the result by 100%;

[0177] measuring the bulk density and tap density of the powder coating premix, calculating a flowability index of the powder coating premix by subtracting the bulk density from the tap density, dividing the result by the tap density, and multiplying the result by 100%, and determining the flow characteristics of the powder coating premix based on the flowability index;

[0178] Under preset temperature and pressure conditions, measuring the melting mass of the powder coating premix per unit time, and calculating the melt index of the powder coating premix according to the melting mass divided by the unit time;

[0179] preparing a standard sample based on the particle size uniformity coefficient, the flow characteristics, and the melt index, subjecting the standard sample to a prescribed number of wear cycles, measuring the mass of the standard sample before and after wear, and calculating the wear resistance index of the standard sample by subtracting the mass of the standard sample after wear from the mass of the standard sample before wear and dividing the result by the product of the density and thickness of the standard sample;

[0180] When the wear resistance index reaches the requirement specified by the preset standard, it is determined that the quality of the modified powder coating premix meets the special requirements for grain machinery.

[0181] Particle Size Distribution: Particle size distribution of powder coating premixes is measured using a laser particle size analyzer. A 50g sample is placed in the instrument's inlet, test parameters are set, and the test is repeated three times, with the average result taken as the final result. Particle size distribution parameters, including D10, D50, and D90, are obtained. The standard deviation and average particle size are calculated. Divide the standard deviation by the average particle size and multiply by 100% to obtain the particle size uniformity coefficient. For example, if a batch of samples has a standard deviation of 5μm and an average particle size of 50μm, the particle size uniformity coefficient is 10%.

[0182] Flowability test: Use the bulk density and tap density methods. Pour 100g of sample into a 100mL graduated cylinder and record the initial volume V1, obtaining the bulk density ρ1 = 100g / V1. Then, vibrate the graduated cylinder 1250 times on a vibrating table and record the final volume V2, obtaining the tap density ρ2 = 100g / V2. Calculate the flowability index = (ρ2 - ρ1) / ρ2 × 100%. For example, if a batch of samples has a bulk density of 0.5g / cm³ and a tap density of 0.6g / cm³, the flowability index is 16.7%. The flowability index is used to determine the flow properties of powder coating premixes; a flowability index between 15-25% is generally considered good.

[0183] Melt flow index (MFI) testing: This is performed using a melt flow indexer. Preheat the sample to 190°C and measure the mass of the melt extruded within 10 minutes under a 21.6 kg load. The melt flow index (MFI) is calculated by dividing the melt flow by the extrusion time (10 minutes). The unit is g / 10 min. For example, if a batch of samples extrudes 35 g of melt within 10 minutes, the MFI is 3.5 g / 10 min.

[0184] Wear resistance testing: Prepare standard specimens measuring 100 mm × 100 mm × 4 mm. Use a Taber abrasion tester to perform 1000 abrasion cycles. Measure the mass of the specimens before and after abrasion, and calculate the mass loss. The wear resistance index is calculated by dividing the mass loss by the product of the specimen's density and thickness. For example, if a batch of specimens has a density of 1.2 g / cm³ and a thickness of 0.4 cm, and a mass of 50 g before and after abrasion, and 49.8 g, the wear resistance index is 0.417 mg / cm³.

[0185] When the wear resistance index reaches the preset standard requirement (such as ≤0.5mg / cm³), it is determined that the quality of the modified powder coating premix meets the special requirements for grain machinery, and the preparation of powder coating for grain machinery is completed.

[0186] Select an appropriate base resin, such as epoxy resin, polyester resin, or a hybrid resin. Choose the appropriate curing agent, filler, and additives based on the grain machinery's operating environment and requirements. For example, bisphenol A epoxy resin (E-44) can be used as the base resin, dicyandiamide (DICY) as the curing agent, talc as the filler, and polytetrafluoroethylene (PTFE) as the leveling agent.

[0187] Mix the components according to the preset formula. For example, 70 parts epoxy resin, 5 parts curing agent, 20 parts filler, and 5 parts leveling agent. Place the components in a high-speed mixer and mix at 2000 rpm for 10 minutes to obtain a uniform mixture.

[0188] The mixture was melt-extruded in a twin-screw extruder. The extruder temperature gradient was set to 120°C / 140°C / 160°C / 180°C, and the screw speed was set to 200 rpm. The extruded molten material was cooled by chill rollers and then crushed to obtain a coarse powder.

[0189] The coarse powder was placed in a jet mill for micronization. The feed rate of the jet mill was set to 50 kg / h and the classifier wheel speed was set to 12000 rpm to obtain a fine powder.

[0190] Modify the fine powder. Select an appropriate modifier, such as nano-silica or nano-alumina. Mix the modifier and fine powder in a mass ratio of 1:100. Place the mixture in a high-speed mixer and mix at 1500 rpm for 5 minutes to obtain a modified powder coating premix.

[0191] After the modified powder coating premix passes the aforementioned quality inspections, it can be used for coating grain machinery. Application methods include electrostatic spraying or fluidized bed dipping. For example, using electrostatic spray equipment, set the spray voltage to 60 kV, the spray distance to 200 mm, and the spray time to 20 seconds. The coating thickness should be controlled within 60-80 μm.

[0192] After coating, the workpiece is cured. Place the workpiece in an oven and cure at 180°C for 20 minutes. The cured coating should have good adhesion, wear resistance, and corrosion resistance, meeting the requirements of grain machinery.

[0193] In practical applications, coating formulations and preparation processes can be appropriately adjusted based on the type of grain machinery and equipment and the specific operating environment to achieve optimal protection. For example, for parts that come into direct contact with grain, the dosage of food-grade additives can be increased; for parts susceptible to wear, the content of wear-resistant fillers can be increased; and for equipment exposed to humid environments, the coating's corrosion resistance can be enhanced.

[0194] According to a second aspect of the embodiments of the present invention,

[0195] Provide a wear-resistant quality control system for powder coatings for grain machinery, including:

[0196] The first unit is used to add a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stir and mix the epoxy grain machinery wear-resistant coating, and make the epoxy grain machinery wear-resistant coating fully mixed to obtain a powder coating premix;

[0197] The second unit is used to add carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing, and use a high-speed disperser to shear and disperse the carbon fiber and the boron nitride toughening agent so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix to obtain a toughened powder coating premix;

[0198] The third unit is used to convey the toughened powder coating premix to a twin-screw extruder for extrusion to obtain a molten powder coating; and cool the temperature of the molten powder coating to room temperature to obtain a solid powder coating;

[0199] The fourth unit is used to introduce a mixed gas of oxygen and argon into the solid powder coating, start a plasma generator to generate plasma to react with the solid powder coating on the surface, form a modified layer having polar groups on the surface of the solid powder coating, and obtain a modified powder coating premix;

[0200] The fifth unit is used to perform quality inspection on the modified powder coating premix. The inspection items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified in the preset standard, the preparation of the special powder coating for grain machinery is completed.

[0201] According to a third aspect of the embodiments of the present invention,

[0202] An electronic device is provided, comprising:

[0203] processor;

[0204] a memory for storing processor-executable instructions;

[0205] The processor is configured to call the instructions stored in the memory to execute the aforementioned method.

[0206] According to a fourth aspect of the embodiments of the present invention,

[0207] A computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the method described above is implemented.

[0208] The present invention may be a method, an apparatus, a system and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for executing various aspects of the present invention.

[0209] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quality control method for the wear resistance of powder coatings for grain machinery, characterized in that: include: Adding a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stirring and mixing the epoxy grain machinery wear-resistant coating to ensure that the epoxy grain machinery wear-resistant coating is fully mixed to obtain a powder coating premix; Adding carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing, and performing shear dispersion treatment on the carbon fiber and the boron nitride toughening agent using a high-speed disperser so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix to obtain a toughened powder coating premix; conveying the toughened powder coating premix to a twin-screw extruder for extrusion to obtain a molten powder coating; cooling the temperature of the molten powder coating to room temperature to obtain a solid powder coating; A mixed gas of oxygen and argon is introduced into the solid powder coating, and a plasma generator is started to generate plasma to react with the solid powder coating on the surface, thereby forming a modified layer having polar groups on the surface of the solid powder coating to obtain a modified powder coating premix; The modified powder coating premix is subjected to quality inspection, and the inspection items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified by the preset standard, the preparation of the special powder coating for grain machinery is completed.

2. The method according to claim 1, characterized in that Adding a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stirring and mixing the epoxy grain machinery wear-resistant coating to fully mix the epoxy grain machinery wear-resistant coating to obtain a powder coating premix comprising: Adding a predetermined ratio of epoxy grain machinery wear-resistant coating to the stirring tank, and setting a plurality of sensing detection devices on the inner wall of the stirring tank, wherein the plurality of sensing detection devices include a viscosity sensor, a temperature sensor and a conductivity sensor, and the plurality of sensing detection devices respectively collect viscosity data, temperature data and conductivity data of the epoxy grain machinery wear-resistant coating; A plurality of sampling ports are provided at different positions of the stirring tank, and local samples of the epoxy grain machinery wear-resistant coating are collected through the plurality of sampling ports to obtain local sampling concentrations of the local samples; Calculating a mixing uniformity index based on the local sampling concentration, and stopping stirring when the mixing uniformity index reaches a preset range; performing fluorescent tracing detection on the epoxy grain machinery wear-resistant coating after stirring to obtain a flow field distribution diagram of the epoxy grain machinery wear-resistant coating, and judging the mixing uniformity of the epoxy grain machinery wear-resistant coating based on the flow field distribution diagram; When the mixing uniformity of the epoxy grain machinery wear-resistant coating meets the preset conditions, the stirred epoxy grain machinery wear-resistant coating is output to the next process to obtain a powder coating premix.

3. The method according to claim 1, characterized in that The carbon fiber and the boron nitride toughening agent are added to the uniformly mixed powder coating premix for secondary mixing, and the carbon fiber and the boron nitride toughening agent are sheared and dispersed by a high-speed disperser so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix. The toughened powder coating premix comprises: Adding carbon fiber and boron nitride toughening agent to a uniformly mixed powder coating premix, and performing shear dispersion treatment on the carbon fiber and the boron nitride toughening agent using a high-speed disperser, wherein the high-speed disperser is provided with a temperature sensor and a shear force sensor, and the dispersion temperature and shear stress of the carbon fiber and the boron nitride toughening agent are monitored in real time by the temperature sensor and the shear force sensor; Inert gas is introduced into the high-speed disperser, and polar functional groups formed on the surface of the carbon fiber are treated by plasma in the inert gas environment to increase the surface free energy of the carbon fiber; Adding a powder coating premix to the high-speed disperser, co-dispersing the powder coating premix with the carbon fiber and the boron nitride toughening agent, and forming a three-dimensional network structure under the dispersing action of the high-speed disperser; Setting a plurality of sampling detection points at different positions of the three-dimensional network structure, collecting samples at the sampling detection points, and measuring the dispersed particle size distribution of the carbon fiber and the boron nitride toughening agent in the samples using a laser particle size analyzer; The dispersed powder coating premix is subjected to a stress-strain test and a fracture toughness test to obtain the Young's modulus and the critical strain energy release rate of the powder coating premix; when the Young's modulus and the critical strain energy release rate meet the preset requirements, the powder coating premix is transported to a subsequent process for processing to obtain a toughened powder coating premix.

4. The method according to claim 3, characterized in that Adding a powder coating premix to the high-speed disperser, co-dispersing the powder coating premix with the carbon fiber and the boron nitride toughening agent, and forming a three-dimensional network structure under the dispersing action of the high-speed disperser comprises: adding a powder coating premix into the high-speed disperser, performing a shear rheology test on the powder coating premix at different shear rates to obtain the shear stress of the powder coating premix at the different shear rates; establishing a rheological curve according to the corresponding relationship between the shear stress and the shear rate, obtaining the zero shear viscosity and infinite shear viscosity of the powder coating premix through the rheological curve, and determining an optimal shear rate range based on the zero shear viscosity and the infinite shear viscosity; Within the optimal shear rate range, adding carbon fiber and a boron nitride toughening agent to the powder coating premix, applying an electrostatic field and spraying a surfactant during the dispersion process of the high-speed disperser, and offsetting the van der Waals force between the carbon fiber and the boron nitride toughening agent by the electrostatic force generated by the electrostatic field and the steric resistance generated by the surfactant; Measuring the volume fractions of the carbon fiber and the boron nitride toughening agent, calculating a mixing entropy change according to the volume fractions, and adjusting the ratio of the carbon fiber and the boron nitride toughening agent based on the calculated result of the mixing entropy change so that the mixing entropy change reaches a maximum value; The calculation result of the hybrid entropy change is subjected to synchrotron radiation small-angle scattering analysis to obtain a scattering vector and a radial distribution function of the calculation result of the hybrid entropy change, and a three-dimensional network structure is obtained by weighted calculation based on the scattering vector and the radial distribution function.

5. The method according to claim 1, wherein A mixed gas of oxygen and argon is introduced into the solid powder coating, a plasma generator is started to generate plasma to react with the solid powder coating on the surface, and a modified layer having polar groups is formed on the surface of the solid powder coating to obtain a modified powder coating premix, comprising: Passing a mixed gas of oxygen and argon into the solid powder coating, controlling the flow rate of the oxygen to be smaller than the flow rate of the argon, so that the mixed gas forms a uniform atmosphere in the solid powder coating; In the uniform atmosphere, the solid powder coating is evenly spread on the stage at the bottom of the reaction chamber, wherein the thickness of the solid powder coating is less than one quarter of the height of the stage; The reaction chamber is evacuated to a preset vacuum degree, and then the mixed gas is introduced to make the working pressure of the reaction chamber reach the preset pressure, and the reaction chamber is left to stand for pretreatment; Starting a plasma generator to generate plasma, adjusting the output power of the plasma generator to a first preset power, and controlling the discharge distance between the plasma and the solid powder coating to reach a preset distance; The oxygen in the mixed gas is ionized under the action of the plasma to form active oxygen, and the active oxygen chemically reacts with the surface of the solid powder coating to form a modified layer containing polar groups on the surface of the solid powder coating; According to the growth of the modified layer, adjusting the output power of the plasma generator to a second preset power, and controlling the modified layer to grow uniformly to a preset thickness; Adjusting the power density of the plasma generator to control the polar groups to form a uniform distribution in the modified layer so that the surface density of the polar groups reaches a preset density; The polar group density on the surface of the solid powder coating is monitored. When the rate of change of the polar group density measured multiple times in succession is less than a preset change threshold, the plasma generator is turned off and the mixture is cooled to room temperature to obtain a surface-modified powder coating premix.

6. The method according to claim 5, characterized in that The oxygen in the mixed gas is ionized under the action of the plasma to form active oxygen, and the active oxygen chemically reacts with the surface of the solid powder coating to form a modified layer containing polar groups on the surface of the solid powder coating, which includes: In a plasma environment, the oxygen in the mixed gas is ionized to form active oxygen; Controlling the active oxygen to chemically react with the surface of the solid powder coating to form chemically bonded polar groups on the surface of the solid powder coating; The polar groups gradually grow on the surface of the solid powder coating to form a modified layer, and the polar groups in the modified layer are distributed in a gradient from the surface to the inside.

7. The method according to claim 1, characterized in that The modified powder coating premix is subjected to quality testing, wherein the testing items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified by the preset standard, the preparation of the powder coating for grain machinery is completed, which includes: The modified powder coating premix is subjected to a particle size distribution measurement to obtain a particle distribution parameter of the powder coating premix, and a particle size uniformity coefficient of the powder coating premix is calculated by dividing the standard deviation of the particle distribution parameter by the average particle size and multiplying the result by 100%; measuring the bulk density and tap density of the powder coating premix, calculating a flowability index of the powder coating premix by subtracting the bulk density from the tap density, dividing the result by the tap density, and multiplying the result by 100%, and determining the flow characteristics of the powder coating premix based on the flowability index; Under preset temperature and pressure conditions, measuring the melting mass of the powder coating premix per unit time, and calculating the melt index of the powder coating premix according to the melting mass divided by the unit time; preparing a standard sample based on the particle size uniformity coefficient, the flow characteristics, and the melt index, subjecting the standard sample to a prescribed number of wear cycles, measuring the mass of the standard sample before and after wear, and calculating the wear resistance index of the standard sample by subtracting the mass of the standard sample after wear from the mass of the standard sample before wear and dividing the result by the product of the density and thickness of the standard sample; When the wear resistance index reaches the requirement specified by the preset standard, it is determined that the quality of the modified powder coating premix meets the special requirements for grain machinery.

8. A quality control system for the wear resistance of powder coatings for grain machinery, used to implement the method according to any one of claims 1 to 7, characterized in that: include: The first unit is used to add a predetermined ratio of epoxy grain machinery wear-resistant coating into a stirring tank, stir and mix the epoxy grain machinery wear-resistant coating, and make the epoxy grain machinery wear-resistant coating fully mixed to obtain a powder coating premix; The second unit is used to add carbon fiber and boron nitride toughening agent to the uniformly mixed powder coating premix for secondary mixing, and use a high-speed disperser to shear and disperse the carbon fiber and the boron nitride toughening agent so that the carbon fiber and the boron nitride toughening agent are evenly distributed in the powder coating premix to obtain a toughened powder coating premix; The third unit is used to convey the toughened powder coating premix to a twin-screw extruder for extrusion to obtain a molten powder coating; and cool the temperature of the molten powder coating to room temperature to obtain a solid powder coating; The fourth unit is used to introduce a mixed gas of oxygen and argon into the solid powder coating, start a plasma generator to generate plasma to react with the solid powder coating on the surface, form a modified layer having polar groups on the surface of the solid powder coating, and obtain a modified powder coating premix; The fifth unit is used to perform quality inspection on the modified powder coating premix. The inspection items include particle size distribution, fluidity, melt index and wear resistance. When the wear resistance of the modified powder coating premix meets the requirements specified in the preset standard, the preparation of the special powder coating for grain machinery is completed.

9. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to call the instructions stored in the memory to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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