Production process and equipment of spherical wax micro powder

Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses a production process of spherical wax micropowder, which comprises the following steps: melting solid wax into a wax melt, and preserving at a constant temperature in an environment which is at least 20 DEG C higher than the melting point of the wax; the wax melt and hot water are mixed according to the flow ratio of 1: (10-20) and then sprayed out to form mist spray, the mist spray enters mist spray pool water with the temperature of the wax melting point + / -5 DEG C, and wax liquid drops in the mist spray are subjected to condensation polymerization in the mist spray pool water to form spherical wax melt; the spherical wax melt gradually rises into cooling water flow in the water of the spraying pool, the temperature of the cooling water flow is 10-20 DEG C lower than the wax melting point, the spherical wax melt flows in the cooling water flow and is cooled, the spherical wax melt is separated from the cooling water flow, and dewatering and drying are conducted to obtain the spherical wax micro powder. The process can improve the sphericity and particle size uniformity of the wax micro powder.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly to a production process and equipment for spherical wax micro-powder. Background Art

[0002] Wax micro-powder is an important functional material, widely used in fields such as coatings, inks, plastics, cosmetics, electronic packaging, and 3D printing. Its unique properties highly depend on the microscopic morphology, particle size distribution, and surface characteristics. Among them, spherical wax micro-powder, due to its regular geometric shape, uniform particle size, and high fluidity, can significantly improve the processing performance of materials and the quality of end products. For example, it can improve the film-forming uniformity in coatings, reduce friction loss in plastic processing, or enhance the interfacial bonding strength in electronic packaging.

[0003] In related technologies, a method for preparing spherical polyethylene micro-powder wax using polyethylene wax by-products of polyethylene production is disclosed. The polyethylene wax by-products generated during the polyethylene production process are dissolved in an organic solvent, a surfactant is added, and after stirring, the polyethylene micro-powder wax is precipitated from the solvent by cooling. The average particle size of the obtained product is 18 - 22 μm, the melting point is increased from 76.4 °C to 90.7 °C, and the yield reaches 95%.

[0004] However, in the process, small flaky or rod-shaped wax melts condense into spheres due to their own cohesive force, but there are also individual wax micro-droplets that do not have time to shrink into completely spherical shapes and solidify, presenting cylindrical rod-shaped, elliptical particles with unequal aspect ratios, or particles connected in twos or threes, resulting in poor sphericity of the wax micro-powder particles. Summary of the Invention

[0005] In order to improve the sphericity of wax micro-powder, the present application provides a production process and equipment for spherical wax micro-powder.

[0006] In the first aspect, a production process for spherical wax micro-powder provided by the present application adopts the following technical solution:

[0007] A production process for spherical wax micro-powder includes the following steps:

[0008] Melting solid wax into wax melt and storing it at a constant temperature in an environment at least 20 °C higher than the wax melting point;

[0009] Mixing the wax melt and hot water at a flow rate ratio of 1:(10 - 20) and spraying them out to form a spray. The spray enters the spray pond water at a temperature of the wax melting point ±5 °C, and the wax droplets in the spray condense into spherical wax melts in the spray pond water;

[0010] The spherical wax melt gradually rises in the spray pool water to the cooling water flow, the temperature of the cooling water flow is 10-20°C lower than the melting point of the wax, the spherical wax melt flows in the cooling water flow and cools down, the spherical wax melt is separated from the cooling water flow, dehydrated and dried to obtain spherical wax micropowder.

[0011] By adopting the above technical scheme, the viscosity of the wax melt can be reduced by 20°C above the melting point, making it have better fluidity and facilitating the formation of uniform droplets in the subsequent spraying process. Constant temperature storage can avoid partial solidification of the wax liquid due to local temperature fluctuations and ensure that the inside of the droplets is in a completely molten state. When hot water is mixed with the wax melt, the high-temperature water phase prevents the surface of the droplets from solidifying prematurely due to excessive temperature difference, and at the same time refines the droplet size through turbulent shear force. When the wax droplets enter the spray pool, the droplets are in a molten-semisolid critical state in a water environment with a temperature near the melting point. At this time, the surface free energy of the wax droplets dominates the morphological evolution, and the internal stress of the droplets is eliminated through the Marangoni effect, so that they spontaneously condense into a spherical structure with the lowest energy. The temperature control of the spray pool water ensures that the droplets maintain moderate fluidity during the condensation process, avoiding non-spherical deformation caused by external water flow impact or gravity. In an environment of ±5°C from the melting point, the droplets slowly cool to near the solidification point after completing spherization, forming a solid shell on the surface, and the interior is still molten. The temperature is further reduced by 10-20℃, and uniform solidification from the outside to the inside is achieved through heat dissipation of water flow. This process avoids the volume shrinkage stress concentration caused by rapid cooling, and prevents the spherical structure from collapsing or deforming due to the release of internal stress. Therefore, this process links the hot water blending with the spray pool water temperature to avoid non-equilibrium phase change caused by sudden cooling when the droplets enter the low-temperature environment. There is no need to rely on surfactants or anti-adhesive agents to adjust the morphology. Spheroidization is completely achieved through physical fields to ensure product purity. This process can improve the sphericity and particle size uniformity of wax micropowder.

[0012] In a specific embodiment, the particle size of the spherical wax powder is 1-300 μm.

[0013] By adopting the above technical solution, the wax micropowder particles produced by this process are between 1-300 microns and are normally distributed. When used for coatings and inks, wax micropowder between 1-30 microns is selected, and it is best to select uniform fine wax micropowder particles with a particle size of Dv50≤6μm and Dv100<30μm. 3D printing selects a wider range and larger particle size.

[0014] In a specific embodiment, the wax has a melting point of less than 100° C. and is insoluble in water.

[0015] By adopting the above technical solutions, wax with a melting point < 100°C can be melted at a lower temperature. Compared with high-melting-point wax, the heating energy consumption is significantly reduced. The low-melting-point wax can quickly complete droplet polycondensation and preliminary solidification in the spray pool, shortening the process time and improving production efficiency. Wax is insoluble in water and can directly use water as the heat transfer medium without adding emulsifiers or surfactants, ensuring product purity and avoiding complex phase separation and wastewater treatment problems in the emulsification process. The whole process uses water as the medium without organic solvents, conforming to the environmental protection trend, reducing VOCs emissions, and meeting the low-carbon manufacturing trend.

[0016] In a specific feasible embodiment, the wax is one or a mixture of polyethylene wax, polypropylene wax, amide wax, paraffin wax, Fischer-Tropsch wax, rice bran wax, microcrystalline wax, palm wax, montan wax, fatty acids and their derivatives, petroleum resin.

[0017] By adopting the above technical solutions, the above specific waxes with properties similar to those of wax polymers can all be used as raw materials for this process, and wax micro-powders with good sphericity can be prepared.

[0018] In a specific feasible embodiment, the temperature of the hot water is not lower than the wax melting point temperature.

[0019] By adopting the above technical solutions, when the hot water temperature ≥ wax melting point temperature, the two will not cause rapid solidification of the droplet surface due to temperature difference when mixed instantaneously. The wax droplets remain in a molten state throughout the spraying process, providing sufficient time for spheroidization driven by surface tension. If the hot water temperature is lower than the wax melting point temperature, a solid shell layer will quickly form on the droplet surface, and the internal liquid wax will generate internal stress due to cooling contraction, resulting in particle collapse, hollowing or surface wrinkling.

[0020] In a second aspect, an apparatus for applying the above production process of spherical wax micro-powders adopts the following technical solutions:

[0021] An apparatus for applying the above production process of spherical wax micro-powders includes a wax melt storage tank, a melt pump, a hot water pump, a hot water heating heat exchanger, a hot water storage tank, a spraying pool, a nozzle, a cold water storage tank, and a cold water flow control valve. The wax melt storage tank is connected to the melt pump through a pipeline, the melt pump is connected to the nozzle through a pipeline, the nozzle is arranged at the bottom of the spraying pool, the hot water storage tank is connected to the hot water pump through a pipeline, the hot water pump is connected to the nozzle through a pipeline, the pipeline between the hot water pump and the nozzle passes through the hot water heating heat exchanger, the cold water storage tank is connected to the top of the spraying pool through a pipeline, the cold water flow control valve is arranged on the pipeline between the cold water storage tank and the spraying pool, and a discharge port is arranged on the peripheral wall of the top of the spraying pool.

[0022] By adopting the above technical solution, the molten wax solution melted from the solid wax is stored in the wax melt storage tank. The melt pump transports the molten wax solution to the nozzle, and the hot water pump transports the hot water in the hot water storage tank to the nozzle. The hot water heating heat exchanger is used to heat the hot water to a set temperature. The nozzle sprays out after mixing the hot water and the molten wax solution. The spray polymerizes into spherical wax melts in the hot water of the spraying pool and rises to the top of the spraying pool. The cold water storage tank transports cold water to the top of the spraying pool. The cold water mixes with the hot water in the spraying pool to form a cooling water flow. The spherical wax melts flow and cool down in the cooling water flow and are discharged from the discharge port, facilitating solid-liquid separation. Therefore, the above equipment can implement the production process of this application and facilitate the continuous production of spherical wax micro-powder.

[0023] In a specific feasible embodiment, the spraying pool includes a vertical cylinder and a horizontal channel. The vertical cylinder is arranged vertically. The nozzle is arranged at the bottom of the vertical cylinder. One end of the horizontal channel is fixedly connected to the top of the vertical cylinder. The horizontal channel is arranged horizontally. The discharge port is arranged at the end of the horizontal channel away from the vertical cylinder. The horizontal channel is communicated with the vertical cylinder. The cold water storage tank is connected to the top of the horizontal channel through a pipeline.

[0024] By adopting the above technical solution, the spray polymerizes into spherical wax melts at the bottom of the vertical cylinder and rises along the hot water in the vertical cylinder. After rising into the horizontal channel, it flows and cools down following the cooling water flow in the horizontal channel, which can avoid the volume shrinkage stress concentration caused by rapid cooling and prevent the spherical structure from collapsing or deforming due to the release of internal stress.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. This application avoids non-equilibrium phase transformation caused by sudden cooling when droplets enter a low-temperature environment through the linkage of hot water blending and the temperature of the spraying pool water. It does not rely on surfactants or anti-sticking agents to adjust the morphology and realizes spheroidization completely through physical fields, ensuring product purity. Through this process, the sphericity and particle size uniformity of the wax micro-powder can be improved.

[0027] 2. In this application, it is preferably that the temperature of the hot water is not lower than the wax melting point temperature, so that the wax droplets remain in a molten state throughout the spraying process, providing sufficient time for surface tension-driven spheroidization.

[0028] 3. The equipment of this application can implement the production process of this application and facilitate the continuous production of spherical wax micro-powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the production equipment of spherical wax micro-powder in Embodiment 1 of this application;

[0030] Figure 2 It is one of the electron microscope images of the spherical wax micro-powder prepared in Embodiment 1 of this application;

[0031] Figure 3 The second electron micrograph of the spherical wax micro-powder prepared in Example 1 of the present application;

[0032] Figure 4 The particle size characteristic parameter diagram of the spherical wax micro-powder prepared in Example 1 of the present application;

[0033] Reference numerals: 1, wax melt storage tank; 2, melt pump; 3, hot water pump; 4, hot water heating heat exchanger; 5, hot water storage tank; 6, injection pool; 61, discharge port; 62, vertical cylinder; 63, horizontal channel; 7, nozzle; 8, cold water storage tank; 9, cold water flow control valve. Detailed implementation manners

[0034] The present application will be further described in detail below with reference to examples and comparative examples.

[0035] Example

[0036] Example 1

[0037] This example provides a production device for spherical wax micro-powder, including a wax melt storage tank 1, a melt pump 2, a hot water pump 3, a hot water heating heat exchanger 4, a hot water storage tank 5, an injection pool 6, a nozzle 7, a cold water storage tank 8, and a cold water flow control valve 9.

[0038] The injection pool 6 includes a vertical cylinder 62 arranged in the vertical direction and a horizontal channel 63 arranged in the horizontal direction. The nozzle 7 is installed at the bottom of the vertical cylinder 62, and the nozzle 7 sprays in the vertically upward direction. The left end of the horizontal channel 63 is fixedly connected to the top of the vertical cylinder 62, and the horizontal channel 63 is communicated with the vertical cylinder 62. A discharge port 61 is provided on the peripheral wall at the right end of the horizontal channel 63.

[0039] The discharge end of the wax melt storage tank 1 is connected to the pump inlet end of the melt pump 2 through a pipeline, and the pump outlet end of the melt pump 2 is connected to the nozzle 7 through a pipeline. The discharge end of the hot water storage tank 5 is connected to the pump inlet end of the hot water pump 3 through a pipeline, and the pump outlet end of the hot water pump 3 is connected to the nozzle 7 through a pipeline. The pipeline between the hot water pump 3 and the nozzle 7 passes through the inside of the hot water heating heat exchanger 4.

[0040] The cold water storage tank 8 is communicated with the top of the horizontal channel 63 through a pipeline, and the cold water flow control valve 9 is installed on the pipeline between the cold water storage tank 8 and the horizontal channel 63.

[0041] The working principle of the production device for spherical wax micro-powder in this example is as follows: The solid wax is melted and stored in the wax melt storage tank 1, and the temperature in the wax melt storage tank 1 is at least 20 degrees Celsius higher than the wax melting point, and the temperature is kept constant during the storage process. The solid wax can be melted in the wax melt storage tank 1, or can be melted by a screw extruder or other methods and then fed into the wax melt storage tank 1.

[0042] Start the melt pump 2 and transport the molten wax to the nozzle 7 at a constant flow rate. At the same time, start the hot water pump 3 and transport the hot water to the nozzle 7 at a constant flow rate. The flow rate ratio of the molten wax to the hot water is between 1:(10 - 20), and in this embodiment, the flow rate ratio of the molten wax to the hot water is 1:20. The molten wax and the hot water are mixed and ejected through the nozzle 7, and the ejected spray enters the spray pool water in the vertical cylinder 62. The temperature of the spray pool water is the wax melting point ±5°C. In this embodiment, the temperature of the spray pool water is 5°C lower than the wax melting point, and the wax droplets in the spray condense into spherical wax melts in the spray pool water.

[0043] The spherical wax melts gradually rise in the spray pool water in the vertical cylinder 62 and flow together with the cooling water flow in the horizontal channel 63 after rising into it. At the same time, the cold water in the cold water storage tank 8 continuously flows into the horizontal pipe at a set flow rate to continuously cool the spherical wax melts. The spherical wax melts and the cooling water flow are discharged from the discharge port 61. Then, the spherical wax melts are separated from the cooling water flow, dehydrated, and dried to obtain spherical wax micropowder.

[0044] This embodiment also provides a production process for spherical wax micropowder, including the following steps:

[0045] Melt the polyethylene wax (grade TP70, melting point 75°C, melt viscosity 10 mPa·s, density 0.92 g / cm 3 ) into a molten wax using a Nanjing Keya 35 twin-screw extruder, send it into the molten wax storage tank, and keep it at a constant temperature in an environment of 110°C.

[0046] Input the molten wax into the nozzle at a flow rate of 0.5 L / min. At the same time, input the 90°C hot water into the nozzle at a flow rate of 10 L / min. After mixing, it is ejected to form a spray, and the spray enters the 70°C spray pool water. The wax droplets in the spray condense into spherical wax melts in the spray pool water.

[0047] The spherical wax melts gradually rise into the cooling water flow in the spray pool water. The temperature of the cooling water flow is 10 - 20°C lower than the wax melting point. The spherical wax melts flow in the cooling water flow. The initial temperature of the spherical wax melts entering the cooling water flow is 65°C, and the temperature drops by 57°C when the spherical wax melts flow to the discharge port. After the spherical wax melts and the cooling water flow flow out from the discharge port, the spherical wax melts are separated from the cooling water flow, dehydrated, and dried to obtain spherical wax micropowder.

[0048] Example 2

[0049] The difference between this embodiment and Example 1 is only that in the production process of spherical wax micropowder: the polyethylene wax (grade TP70, melting point 75°C, melt viscosity 10 mPa·s, density 0.92 g / cm 3) Add it to the molten wax storage tank, heat it up to 110°C, and when the polyethylene wax is completely melted into a molten wax liquid, keep it at a constant temperature in an environment of 110°C.

[0050] Example 3

[0051] The difference between this example and Example 1 is only that in the production process of spherical wax micropowder: Polyethylene wax (grade TP70, melting point 75°C, melt viscosity 10 mPa·s, density 0.92 g / cm 3 ) is melted into a molten wax liquid using a Nanjing Keya 35 twin-screw extruder, fed into the molten wax storage tank, and kept at a constant temperature in an environment of 95°C.

[0052] Example 4

[0053] The difference between this example and Example 1 is only that in the production process of spherical wax micropowder: Polyethylene wax (grade TP70, melting point 75°C, melt viscosity 10 mPa·s, density 0.92 g / cm 3 ) is melted into a molten wax liquid using a Nanjing Keya 35 twin-screw extruder, fed into the molten wax storage tank, and kept at a constant temperature in an environment of 105°C.

[0054] Example 5

[0055] The difference between this example and Example 1 is only that in the production process of spherical wax micropowder: The molten wax liquid is input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C is input into the nozzle at a flow rate of 5 L / min. After blending, it is sprayed out to form a spray. The spray enters the spray pond water at 70°C, and the wax droplets in the spray condense into spherical wax melt in the spray pond water.

[0056] Example 6

[0057] The difference between this example and Example 1 is only that in the production process of spherical wax micropowder: The molten wax liquid is input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C is input into the nozzle at a flow rate of 7.5 L / min. After blending, it is sprayed out to form a spray. The spray enters the spray pond water at 70°C, and the wax droplets in the spray condense into spherical wax melt in the spray pond water.

[0058] Example 7

[0059] The difference between this example and Example 1 is only that in the production process of spherical wax micropowder: The molten wax liquid is input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C is input into the nozzle at a flow rate of 10 L / min. After blending, it is sprayed out to form a spray. The spray enters the spray pond water at 75°C, and the wax droplets in the spray condense into spherical wax melt in the spray pond water.

[0060] Example 8

[0061] The difference between this embodiment and Embodiment 1 is only that in the production process of spherical wax fine powder: the wax melt is input into the nozzle at a flow rate of 0.5 L / min, and at the same time, hot water at 90 °C is input into the nozzle at a flow rate of 10 L / min. After blending, it is ejected to form a spray. The spray enters the spray pond water at 80 °C, and the wax droplets in the spray are polycondensed into spherical wax melts in the spray pond water.

[0062] Embodiment 9

[0063] The difference between this embodiment and Embodiment 1 is only that an equal amount of polypropylene wax (model Licocene PP2602, melting point 98 °C, melt viscosity 7000 mPa·s, density 0.88 g / cm 3 ) is used to replace polyethylene wax (grade TP70, melting point 75 °C, melt viscosity 10 mPa·s, density 0.92 g / cm 3 ).

[0064] Embodiment 10

[0065] The difference between this embodiment and Embodiment 1 is only that an equal amount of amide wax (model Clariant Licolub H22, melting point 106 °C, melt viscosity 300 mPa·s, density 0.96 g / cm 3 ) is used to replace polyethylene wax (grade TP70, melting point 75 °C, melt viscosity 10 mPa·s, density 1.03 g / cm 3 ).

[0066] Embodiment 11

[0067] The difference between this embodiment and Embodiment 1 is only that the wax melt is input into the nozzle at a flow rate of 0.5 L / min, and at the same time, hot water at 75 °C is input into the nozzle at a flow rate of 10 L / min. After blending, it is ejected to form a spray. The spray enters the spray pond water at 70 °C, and the wax droplets in the spray are polycondensed into spherical wax melts in the spray pond water.

[0068] Embodiment 12

[0069] The difference between this embodiment and Embodiment 1 is only that the wax melt is input into the nozzle at a flow rate of 0.5 L / min, and at the same time, hot water at 70 °C is input into the nozzle at a flow rate of 10 L / min. After blending, it is ejected to form a spray. The spray enters the spray pond water at 70 °C, and the wax droplets in the spray are polycondensed into spherical wax melts in the spray pond water.

[0070] Comparative Example

[0071] Comparative Example 1

[0072] The difference between this comparative example and Example 1 is only that the polyethylene wax (grade TP70, melting point 75°C, melt viscosity 10 mPa·s, density 0.92 g / cm 3 ) was melted into a wax melt using a Nanjing Keya 35 twin-screw extruder and fed into a wax melt storage tank, where it was stored at a constant temperature in an environment of 90°C.

[0073] Comparative Example 2

[0074] The difference between this comparative example and Example 1 is only that the polyethylene wax (grade TP70, melting point 75°C, melt viscosity 10 mPa·s, density 0.92 g / cm 3 ) was melted into a wax melt using a Nanjing Keya 35 twin-screw extruder and fed into a wax melt storage tank, where it was stored at a constant temperature in an environment of 80°C.

[0075] Comparative Example 3

[0076] The difference between this comparative example and Example 1 is only that the wax melt was input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C was input into the nozzle at a flow rate of 4 L / min. After blending, it was sprayed out to form a spray. The spray entered the spray pond water at 70°C, and the wax droplets in the spray condensed into spherical wax melts in the spray pond water.

[0077] Comparative Example 4

[0078] The difference between this comparative example and Example 1 is only that the wax melt was input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C was input into the nozzle at a flow rate of 12 L / min. After blending, it was sprayed out to form a spray. The spray entered the spray pond water at 70°C, and the wax droplets in the spray condensed into spherical wax melts in the spray pond water.

[0079] Comparative Example 5

[0080] The difference between this comparative example and Example 1 is only that the wax melt was input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C was input into the nozzle at a flow rate of 10 L / min. After blending, it was sprayed out to form a spray. The spray entered the spray pond water at 65°C, and the wax droplets in the spray condensed into spherical wax melts in the spray pond water.

[0081] Comparative Example 6

[0082] The difference between this comparative example and Example 1 is only that the wax melt was input into the nozzle at a flow rate of 0.5 L / min. At the same time, hot water at 90°C was input into the nozzle at a flow rate of 10 L / min. After blending, it was sprayed out to form a spray. The spray entered the spray pond water at 85°C, and the wax droplets in the spray condensed into spherical wax melts in the spray pond water.

[0083] Performance Detection Test

[0084] For Examples 1-12 and Comparative Examples 1-6, the following performance tests were carried out:

[0085] 1. According to ASTM D6393-21, the angle of repose of each example and comparative example was measured. The test results are shown in Table 1.

[0086] 2. According to ASTM B329-24, the bulk density of each example and comparative example was measured. The test results are shown in Table 1.

[0087] 3. The morphology of the spherical wax melt prepared in Example 1 was observed by electron microscopy, and the oval particles, rod-shaped particles and agglomerated particles with different aspect ratios of spherical particles were counted, and the proportions they accounted for were marked as: spherical 88%, oval 4%, rod-shaped 3%, agglomerated 3%, and other atypical particles were 2%, as Figure 2 and Figure 3 shown.

[0088] 4. The particle size characteristic parameters of the spherical wax melt prepared in Example 1 were measured by a laser particle size analyzer, as Figure 4 shown.

[0089] Table 1

[0090]

[0091]

[0092] Combining Example 1 and Comparative Examples 1-6 and Table 1, it can be seen that compared with Example 1, the angle of repose of Comparative Examples 1-6 is significantly larger, or the bulk density is significantly smaller. This shows that the spherical particles obtained by the preparation process of Example 1 have a smoother surface and better fluidity. Therefore, the preparation process of Example 1 can improve the sphericity of the wax micro-powder particles.

[0093] Combining Examples 1-12 and Table 1, it can be seen that the angle of repose of Examples 1-12 is ≤55°, and the bulk density is ≥0.40 g / cm 3 . This shows that the spherical particles obtained by the preparation process within the process conditions of Examples 1-12 have a smooth surface and good fluidity. Therefore, the preparation process within the process conditions of Examples 1-12 can improve the sphericity of the wax micro-powder particles.

[0094] Combining Example 1 and Figures 2 - 4 it can be seen that the wax micro-powder particles prepared by the preparation process of this application show a normal distribution, and particles with the required particle size can be selected by classification.

[0095] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A production process of spherical wax micro-powder, characterized in that, It includes the following steps: Melt the solid wax into a wax melt and keep it at a constant temperature in an environment at least 20°C higher than the wax melting point; Mix and spray the wax melt and hot water at a flow rate ratio of 1:(10 - 20) to form a spray. The spray enters the spray pond water at a temperature of the wax melting point ±5°C, and the wax droplets in the spray condense into spherical wax melts in the spray pond water; The spherical wax melts gradually rise in the spray pond water to the cooling water flow. The temperature of the cooling water flow is 10 - 20°C lower than the wax melting point. The spherical wax melts flow and cool down in the cooling water flow, and the spherical wax melts are separated from the cooling water flow, dehydrated and dried to obtain spherical wax micropowders.

2. The production process of the spherical wax fine powder according to claim 1, characterized in that, The particle size of the spherical wax micropowders is 1 - 300μm.

3. The production process of the spherical wax fine powder according to claim 1, characterized in that The wax melting point is less than 100°C, and the wax is insoluble in water.

4. The production process of the spherical wax fine powder according to claim 3, characterized in that, The wax is one or a mixture of polyethylene wax, polypropylene wax, amide wax, paraffin wax, Fischer-Tropsch wax, rice bran wax, microcrystalline wax, palm wax, montan wax, fatty acids and their derivatives, petroleum resin.

5. The production process of the spherical wax fine powder according to claim 1, characterized in that, The temperature of the hot water is not lower than the wax melting point temperature.

6. An apparatus for a production process of spherical wax fine powder according to any one of claims 1-5, characterized in that, It includes a wax melt storage tank (1), a melt pump (2), a hot water pump (3), a hot water heating heat exchanger (4), a hot water storage tank (5), a spraying pool (6), a nozzle (7), a cold water storage tank (8), and a cold water flow control valve (9). The wax melt storage tank (1) is connected to the melt pump (2) through a pipeline. The melt pump (2) is connected to the nozzle (7) through a pipeline. The nozzle (7) is arranged at the bottom of the spraying pool (6). The hot water storage tank (5) is connected to the hot water pump (3) through a pipeline. The hot water pump (3) is connected to the nozzle (7) through a pipeline. The pipeline between the hot water pump (3) and the nozzle (7) passes through the hot water heating heat exchanger (4). The cold water storage tank (8) is connected to the top of the spraying pool (6) through a pipeline. The cold water flow control valve (9) is arranged on the pipeline between the cold water storage tank (8) and the spraying pool (6). A discharge port (61) is arranged on the peripheral wall at the top of the spraying pool (6).

7. The equipment for the production process of spherical wax micro-powder according to claim 6, characterized in that, The spraying pool (6) includes a vertical cylinder (62) and a horizontal channel (63). The vertical cylinder (62) is arranged in the vertical direction. The nozzle (7) is arranged at the bottom of the vertical cylinder (62). One end of the horizontal channel (63) is fixedly connected to the top of the vertical cylinder (62). The horizontal channel (63) is arranged in the horizontal direction. The discharge port (61) is arranged at the end of the horizontal channel (63) away from the vertical cylinder (62). The horizontal channel (63) is communicated with the vertical cylinder (62). The cold water storage tank (8) is connected to the top of the horizontal channel (63) through a pipeline.

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