High-cleanliness inner barrel coating process

Abstract

The invention discloses a high-cleanliness inner barrel coating process, and relates to the technical field of barrel coating processing, and the high-cleanliness inner barrel coating process comprises the following preparation steps: S1, preparing materials including 100-500 parts of high density polyethylene, 10-550 parts of polypropylene, 1-30 parts of epoxy resin, 1-110 parts of a water-based coating, 10-300 parts of organic silicon, 1-200 parts of a fluorocarbon coating, 1-50 parts of glass fiber and 10-340 parts of calcium carbonate; s2, debugging and checking machining equipment to ensure that equipment parameters are correct; s3, adding the high-density polyethylene, the polypropylene, the glass fiber and the calcium carbonate into the mixing stirrer according to the proportion, and stirring. The high-density polyethylene and the polypropylene are matched for use, so that the internal coating barrel has better structural strength, can bear certain pressure and impact force, is not easy to deform or crack, improves the water resistance and enhances the corrosion resistance while ensuring certain flexibility, the coating is additionally arranged inside, the adhesion performance of impurities is reduced, and the service life of the internal coating barrel is prolonged. And people can conveniently clean the inner coating barrel, and a better use prospect is brought.

Description

Technical Field

[0001] The invention relates to the technical field of barrel coating processing, in particular to a high-cleaning inner barrel coating process. Background Art

[0002] An inner-coated barrel is a packaging container with one or more layers of special coatings or materials coated on the inner wall of the barrel. The barrel body is usually made of metal materials such as cold-rolled iron plate, tinplate, stainless steel, and some are made of other materials such as plastic. These materials have certain strength, toughness and corrosion resistance, and can provide good structural support for the inner-coated barrel. Common inner coating materials include anti-rust enamel, golden phenolic, colored phenolic, epoxy phenolic, polyethylene, polypropylene, polyester, polyamide, and fluorinated resin. Different inner coating materials have different performance characteristics and can be selected according to the purpose of the barrel and the nature of the items contained. In the prior art, some inner-coated barrels use materials with lower strength to reduce costs. When subjected to greater pressure or strong impact, the barrel body is prone to deformation or even rupture. When stacked or hit by external force, the barrel body with insufficient strength may not be able to withstand the pressure and be damaged, resulting in leakage of the contents, and the internal cleaning performance is poor, resulting in more impurities in the inner-coated barrel, which is inconvenient to clean. In this regard, we have proposed a high-cleanliness inner-coated barrel process. Summary of the invention

[0003] In order to solve the above technical problems, a high-cleanliness inner coating barrel process is provided. This technical solution solves the above-mentioned problems of poor pressure resistance and inconvenience in cleaning.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: a high-cleaning internal coating barrel process, the preparation steps are:

[0005] S1. Prepare materials, including: 100-500 parts of high-density polyethylene, 10-550 parts of polypropylene, 1-30 parts of epoxy resin, 1-110 parts of water-based paint, 10-300 parts of silicone, 1-200 parts of fluorocarbon paint, 1-50 parts of glass fiber and 10-340 parts of calcium carbonate;

[0006] S2. Debug and inspect the processing equipment to ensure that the equipment parameters are correct;

[0007] S3, adding high-density polyethylene, polypropylene, glass fiber and calcium carbonate into a mixing mixer according to the proportion, and stirring for 15-30 minutes;

[0008] S4, granulating the stirred raw materials into granules, and placing them into an injection molding machine for injection molding to obtain a barrel shape;

[0009] S5, cleaning the inside of the barrel, removing impurities, and polishing the inner surface of the barrel;

[0010] S6, coating manufacturing, epoxy resin, water-based coating and silicone are placed in a mixer for stirring. During the stirring process, fluorocarbon coating and calcium carbonate are continuously added for continuous stirring for 1 hour;

[0011] S7, pour the stirred paint into the spraying equipment, use the spraying equipment to spray the inside of the barrel, the spraying thickness is 50-100μm, and dry it after spraying;

[0012] S8, putting the sprayed coating into a curing oven for curing, setting the temperature to 120°C and the curing time to 1h, and completing the preparation of the inner coating barrel;

[0013] S9. Perform performance tests on the prepared inner coating barrels, including cleaning performance and impact resistance performance, and package the inner coating barrels with qualified performance.

[0014] Preferably, the specific proportions of materials in step S1 are: 120 parts of high-density polyethylene, 90 parts of polypropylene, 30 parts of epoxy resin, 50 parts of water-based paint, 120 parts of silicone, 150 parts of fluorocarbon paint, 25 parts of glass fiber and 22 parts of calcium carbonate.

[0015] Preferably, in step S1, the polypropylene is one or more of isotactic polypropylene, syndiotactic polypropylene and atactic polypropylene, and the epoxy resin is one of bisphenol A epoxy resin, bisphenol F epoxy resin, novolac epoxy resin and glycidyl ester epoxy resin.

[0016] Preferably, in step S1, the water-based paint is one of water-based acrylic paint, water-based polyurethane paint, water-based alkyd paint and water-based epoxy paint, the silicone is one of silicone oil, silicone rubber and silicone resin, the glass fiber is one of continuous glass fiber and fixed-length glass fiber, and the calcium carbonate is one of heavy calcium carbonate, light calcium carbonate and activated calcium carbonate.

[0017] Preferably, in step S3, the dried high-density polyethylene and polypropylene are first added to a mixing mixer, the mixer is started, and the mixture is stirred at 300-500 r / min for 2-3 minutes for preliminary mixing. The pretreated glass fiber is then added, the stirring speed is increased to 500-800 r / min, and the stirring is continued for 5-10 minutes to uniformly disperse the glass fiber in the plastic matrix. Finally, the surface-treated calcium carbonate is added, the stirring speed is increased to 800-1000 r / min, and the mixture is stirred for 15-30 minutes for mixing.

[0018] Preferably, in the granulation step of step S4, the stirred raw materials are added into the hopper of the granulator, and the raw materials are melted and plasticized in the heating zone under the push of the screw, and are evenly mixed under the shearing and kneading of the screw, extruded into strips through the die head, and entered into the granulator for cutting to form granules, and cooled by air cooling to complete the granulation;

[0019] Injection molding is done by adding granulated particles into the hopper of the injection molding machine, and conveying the particles into the barrel through the rotation of the screw, heating and melting them for plasticization. The screw of the injection molding machine moves forward to inject the molten raw materials into the mold cavity. After the injection is completed, the holding pressure is maintained for further compaction. The barrel body is cooled by the cooling system of the mold for solidification and molding. The mold is opened and the barrel body is removed from the mold to complete the injection molding.

[0020] Preferably, in step S5, 120-grit sandpaper is used for rough grinding of the barrel body to remove the oxide layer, burrs and uneven positions on the surface. After the rough grinding is completed, 300-grit sandpaper is used for fine grinding.

[0021] Preferably, in step S6, the mixer equipment is checked and debugged in advance, a ventilated and dry site is selected and equipped with fire-fighting facilities, and the stirring is divided into three steps. Initially, the mixer is started at a low speed, the materials are added in sequence, and the speed is increased for 15-20 minutes to achieve preliminary mixing; then the speed is reduced, fluorocarbon coating and calcium carbonate are added, and the speed is increased again for continuous stirring; the time is 1 hour, and the temperature and mixing effect are monitored in real time.

[0022] Preferably, during spraying in step S7, the paint is filtered and poured into the equipment material tank, the operator wears protective equipment, adjusts the distance and angle of the spray gun, sprays at a uniform speed along a predetermined path, and monitors with a thickness gauge to make the coating thickness reach 50-100 μm. When drying, the barrel is placed in a dryer, and the temperature and time are set according to the characteristics of the paint and the barrel for drying. After waiting for the drying to be completed and cooled, the coating hardness, adhesion and appearance are checked.

[0023] Preferably, in step S9, the cleaning performance test is performed by soaking the inner coating barrel in sewage, taking it out and wiping it, observing the surface wiping state and whether there are stains, and making an assessment; the impact resistance performance test is performed by using a falling weight of specified mass to freely fall from a height to impact the inner coating barrel, observing the damage, and evaluating the performance according to the standard.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention uses high-density polyethylene and polypropylene to ensure that the inner coating barrel has good structural strength while ensuring a certain degree of flexibility, withstands a certain pressure and impact force, is not easy to deform or break, improves water resistance and enhances corrosion resistance, adds coatings inside, reduces the adhesion of impurities, facilitates people's cleaning of the inner coating barrel, and brings better prospects for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a flow chart of the preparation steps of the present invention. DETAILED DESCRIPTION

[0027] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0028] Reference Figure 1 As shown, a high-cleaning internal coating barrel process, the preparation steps are:

[0029] S1. Prepare materials, including: 100-500 parts of high-density polyethylene, 10-550 parts of polypropylene, 1-30 parts of epoxy resin, 1-110 parts of water-based paint, 10-300 parts of silicone, 1-200 parts of fluorocarbon paint, 1-50 parts of glass fiber and 10-340 parts of calcium carbonate;

[0030] S2. Debug and inspect the processing equipment to ensure that the equipment parameters are correct;

[0031] S3, adding high-density polyethylene, polypropylene, glass fiber and calcium carbonate into a mixing mixer according to the proportion, and stirring for 15-30 minutes;

[0032] S4, granulating the stirred raw materials into granules, and placing them into an injection molding machine for injection molding to obtain a barrel shape;

[0033] S5, cleaning the inside of the barrel, removing impurities, and polishing the inner surface of the barrel;

[0034] S6, coating manufacturing, epoxy resin, water-based coating and silicone are placed in a mixer for stirring. During the stirring process, fluorocarbon coating and calcium carbonate are continuously added for continuous stirring for 1 hour;

[0035] S7, pour the stirred paint into the spraying equipment, use the spraying equipment to spray the inside of the barrel, the spraying thickness is 50-100μm, and dry it after spraying;

[0036] S8, putting the sprayed coating into a curing oven for curing, setting the temperature to 120°C and the curing time to 1h, and preparing the inner coating barrel;

[0037] S9. Perform performance tests on the prepared inner coating barrels, including cleaning performance and impact resistance performance, and package the inner coating barrels with qualified performance.

[0038] The high-density polyethylene and polypropylene of the present application provide basic strength, toughness and rigidity. The combination of the two makes the barrel body have good physical properties and can withstand certain external forces. The glass fiber further enhances the strength and deformation resistance of the barrel body. The epoxy resin, water-based paint, silicone and fluorocarbon paint cooperate with each other to improve the corrosion resistance, water resistance and weather resistance of the inner coating, which can effectively protect the barrel body and stored items. Calcium carbonate is used as a filler, which not only reduces the cost but also improves the dimensional stability of the material.

[0039] The entire process is divided into several clear steps, each with a specific purpose and operating requirements, from material preparation to final performance testing, which are closely linked to ensure the stable quality of the inner coating barrel;

[0040] The cleaning performance and impact resistance performance tests are carried out on the prepared inner-coated barrels to ensure that the products meet the quality standards. The cleaning performance test can ensure that the interior of the inner-coated barrel is clean and pollution-free, suitable for storing various items; the impact resistance performance test ensures that the barrel body can withstand certain impacts without damage during transportation and use, thereby improving the safety and reliability of the product.

[0041] The specific amounts of materials in step S1 are: 120 parts of high-density polyethylene, 90 parts of polypropylene, 30 parts of epoxy resin, 50 parts of water-based paint, 120 parts of silicone, 150 parts of fluorocarbon paint, 25 parts of glass fiber and 22 parts of calcium carbonate.

[0042] In step S1, the polypropylene is one or more of isotactic polypropylene, syndiotactic polypropylene and atactic polypropylene, and the epoxy resin is one of bisphenol A epoxy resin, bisphenol F epoxy resin, novolac epoxy resin and glycidyl ester epoxy resin.

[0043] In step S1, the water-based paint is one of water-based acrylic paint, water-based polyurethane paint, water-based alkyd paint and water-based epoxy paint, the silicone is one of silicone oil, silicone rubber and silicone resin, the glass fiber is one of continuous glass fiber and fixed-length glass fiber, and the calcium carbonate is one of heavy calcium carbonate, light calcium carbonate and activated calcium carbonate.

[0044] In step S3, the dried high-density polyethylene and polypropylene are first added to the mixing mixer, the mixer is started, and the stirring speed is 300-500r / min, and the stirring is carried out for 2-3min to perform preliminary mixing, and then the pretreated glass fiber is added, and the stirring speed is increased to 500-800r / min, and the stirring is continued for 5-10min to make the glass fiber evenly dispersed in the plastic matrix, and finally the surface-treated calcium carbonate is added, the stirring speed is increased to 800-1000r / min, and the stirring is carried out for 15-30min to mix.

[0045] The high-density polyethylene and polypropylene in the present application may have a certain degree of agglomeration in a dry state. Low-speed stirring can make the two plastic particles begin to disperse under relatively mild conditions, avoiding the strong impact force generated by high-speed stirring that causes them to form larger agglomerates, which is conducive to the uniform mixing of other subsequent materials. Glass fibers are usually in bundles or clumps and have strong mutual adsorption. The shear force generated by a higher stirring speed can effectively break the agglomeration between glass fibers and disperse their single fibers. The surface properties of the pretreated glass fibers are improved, and the compatibility with the plastic matrix is ​​improved. It is easier to be evenly dispersed in the plastic matrix at a suitable stirring speed.

[0046] In the granulation step of step S4, the stirred raw materials are added into the hopper of the granulator, and the raw materials are melted and plasticized in the heating zone under the push of the screw, and are evenly mixed under the shearing and kneading of the screw, extruded into strips through the die head, and entered into the granulator for cutting to form granules, and cooled by air cooling to complete the granulation;

[0047] Injection molding is done by adding granulated particles into the hopper of the injection molding machine, and conveying the particles into the barrel through the rotation of the screw, heating and melting them for plasticization. The screw of the injection molding machine moves forward to inject the molten raw materials into the mold cavity. After the injection is completed, the holding pressure is maintained for further compaction. The barrel body is cooled by the cooling system of the mold for solidification and molding. The mold is opened and the barrel body is removed from the mold to complete the injection molding.

[0048] In the present application, the raw materials after stirring are pushed by the screw of the granulator and melted and plasticized in the heating zone. At the same time, under the shearing and mixing action of the screw, the various components can be further evenly mixed, which improves the local unevenness that may have existed originally, ensures that the composition and performance of each particle are relatively consistent, and helps to improve the stability of the quality of the final product; maintaining the holding pressure after the injection is completed can further compact the molten raw materials in the mold cavity, reduce internal pores and gaps, and improve the density and strength of the barrel.

[0049] In step S5, 120-grit sandpaper is used for rough grinding of the barrel body to remove the oxide layer, burrs and uneven positions on the surface. After the rough grinding is completed, 300-grit sandpaper is used for fine grinding.

[0050] The 120-mesh sandpaper of the present application has relatively coarse particles and has strong grinding ability. During the rough grinding process, the oxide layer, burrs and uneven positions on the surface of the barrel can be quickly and effectively removed. The oxide layer may affect the appearance and corrosion resistance of the barrel, the burrs will make the surface of the barrel rough, and the uneven positions will cause inconvenience to subsequent processing and use. Through rough grinding, the surface of the barrel can be initially made flat and clean; rough grinding forms many tiny unevenness on the surface of the barrel, increasing the surface roughness and surface area. When the subsequent coating is sprayed, the larger surface area means that the contact area between the coating and the surface of the barrel is increased, and the coating can better penetrate into these tiny unevenness, thereby enhancing the mechanical bonding between the coating and the barrel.

[0051] In step S6, the mixer equipment is checked and debugged in advance, a ventilated and dry site is selected and equipped with fire-fighting facilities. The mixing is divided into three steps. Initially, the mixer is started at a low speed, and the materials are added in sequence. The speed is increased and the mixing is continued for 15-20 minutes to achieve preliminary mixing. Then the speed is reduced, fluorocarbon coating and calcium carbonate are added, and the mixing speed is increased and continued. The mixing time is 1 hour, and the temperature and mixing effect are monitored in real time.

[0052] This application conducts a comprehensive inspection and debugging of the mixer equipment, which can promptly discover and eliminate potential faults and problems of the equipment. In the initial stage, the mixer is started at a low speed and the materials are added in sequence, and then the stirring speed is increased. This method can gradually mix the various coating components under relatively mild conditions, avoiding the formation of agglomerates of materials due to the strong impact force generated by high-speed stirring.

[0053] When spraying in step S7, filter the paint and pour it into the equipment tank. The operator wears protective equipment, adjusts the distance and angle of the spray gun, sprays at a uniform speed along the predetermined path, and monitors with a thickness gauge to make the coating thickness reach 50-100μm. When drying, put the barrel into the dryer, set the temperature and time according to the characteristics of the paint and the barrel, and dry it. After waiting for the drying to complete and cool down, check the coating hardness, adhesion and appearance.

[0054] The present application filters the paint to remove impurities, particles or lumps that may exist therein. If these impurities are sprayed onto the barrel along with the paint, defects such as bumps and pinholes will appear on the coating surface, affecting the appearance and protective performance of the coating. Adjusting the distance and angle between the spray gun and the inner wall of the barrel and spraying at a uniform speed along a predetermined path can make the paint evenly cover the barrel surface. The appropriate spray gun distance and angle can control the atomization effect and coverage range of the paint, and uniform spraying avoids uneven coating thickness caused by inconsistent spraying speed.

[0055] In step S9, the cleaning performance test is carried out by soaking the inner coating barrel in sewage, taking it out and wiping it, observing the surface wiping state and whether there are stains, and making an assessment; the impact resistance performance test is carried out by using a falling weight of specified mass to freely drop from a height to impact the inner coating barrel, observing the damage, and evaluating the performance according to the standard.

[0056] Example 1

[0057] A high-cleaning internal coating barrel process, the preparation steps are:

[0058] S1. Prepare materials, including: 120 parts of high-density polyethylene, 90 parts of polypropylene, 30 parts of epoxy resin, 50 parts of water-based paint, 120 parts of silicone, 150 parts of fluorocarbon paint, 25 parts of glass fiber and 22 parts of calcium carbonate;

[0059] S2. Debug and inspect the processing equipment to ensure that the equipment parameters are correct;

[0060] S3, adding high-density polyethylene, polypropylene, glass fiber and calcium carbonate into a mixing mixer according to the proportion, and stirring for 15-30 minutes;

[0061] S4, granulating the stirred raw materials into granules, and placing them into an injection molding machine for injection molding to obtain a barrel shape;

[0062] S5, cleaning the inside of the barrel, removing impurities, and polishing the inner surface of the barrel;

[0063] S6, coating manufacturing, epoxy resin, water-based coating and silicone are placed in a mixer for stirring. During the stirring process, fluorocarbon coating and calcium carbonate are continuously added for continuous stirring for 1 hour;

[0064] S7, pour the stirred paint into the spraying equipment, use the spraying equipment to spray the inside of the barrel, the spraying thickness is 50-100μm, and dry it after spraying;

[0065] S8, putting the sprayed coating into a curing oven for curing, setting the temperature to 120°C and the curing time to 1h, and preparing the inner coating barrel;

[0066] S9. Perform performance tests on the prepared inner coating barrels, including cleaning performance and impact resistance performance, and package the inner coating barrels with qualified performance.

[0067] Example 2

[0068] A high-cleaning internal coating barrel process, the preparation steps are:

[0069] S1. Prepare materials, including: 220 parts of high-density polyethylene, 100 parts of polypropylene, 20 parts of epoxy resin, 90 parts of water-based paint, 220 parts of silicone, 100 parts of fluorocarbon paint, 20 parts of glass fiber and 20 parts of calcium carbonate;

[0070] S2. Debug and inspect the processing equipment to ensure that the equipment parameters are correct;

[0071] S3, adding high-density polyethylene, polypropylene, glass fiber and calcium carbonate into a mixing mixer according to the proportion, and stirring for 15-30 minutes;

[0072] S4, granulating the stirred raw materials into granules, and placing them into an injection molding machine for injection molding to obtain a barrel shape;

[0073] S5, cleaning the inside of the barrel, removing impurities, and polishing the inner surface of the barrel;

[0074] S6, coating manufacturing, epoxy resin, water-based coating and silicone are placed in a mixer for stirring. During the stirring process, fluorocarbon coating and calcium carbonate are continuously added for continuous stirring for 1 hour;

[0075] S7, pour the stirred paint into the spraying equipment, use the spraying equipment to spray the inside of the barrel, the spraying thickness is 50-100μm, and dry it after spraying;

[0076] S8, putting the sprayed coating into a curing oven for curing, setting the temperature to 120°C and the curing time to 1h, and completing the preparation of the inner coating barrel;

[0077] S9. Perform performance tests on the prepared inner coating barrels, including cleaning performance and impact resistance performance, and package the inner coating barrels with qualified performance.

[0078] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A high-cleaning internal coating barrel process, characterized in that: The preparation steps are: S1. Prepare materials, including: 100-500 parts of high-density polyethylene, 10-550 parts of polypropylene, 1-30 parts of epoxy resin, 1-110 parts of water-based paint, 10-300 parts of silicone, 1-200 parts of fluorocarbon paint, 1-50 parts of glass fiber and 10-340 parts of calcium carbonate; S2. Debug and inspect the processing equipment to ensure that the equipment parameters are correct; S3, adding high-density polyethylene, polypropylene, glass fiber and calcium carbonate into a mixing mixer according to the proportion, and stirring for 15-30 minutes; S4, granulating the stirred raw materials into granules, and placing them into an injection molding machine for injection molding to obtain a barrel shape; S5, cleaning the inside of the barrel, removing impurities, and polishing the inner surface of the barrel; S6, coating manufacturing, epoxy resin, water-based coating and silicone are placed in a mixer for stirring. During the stirring process, fluorocarbon coating and calcium carbonate are continuously added for continuous stirring for 1 hour; S7, pour the stirred paint into the spraying equipment, use the spraying equipment to spray the inside of the barrel, the spraying thickness is 50-100μm, and dry it after spraying; S8, putting the sprayed coating into a curing oven for curing, setting the temperature to 120°C and the curing time to 1h, and completing the preparation of the inner coating barrel; S9. Perform performance tests on the prepared inner coating barrels, including cleaning performance and impact resistance performance, and package the inner coating barrels with qualified performance.

2. A high-cleaning internal coating barrel process according to claim 1, characterized in that: The specific amounts of materials in step S1 are: 120 parts of high-density polyethylene, 90 parts of polypropylene, 30 parts of epoxy resin, 50 parts of water-based paint, 120 parts of silicone, 150 parts of fluorocarbon paint, 25 parts of glass fiber and 22 parts of calcium carbonate.

3. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In step S1, the polypropylene is one or more of isotactic polypropylene, syndiotactic polypropylene and atactic polypropylene, and the epoxy resin is one of bisphenol A epoxy resin, bisphenol F epoxy resin, novolac epoxy resin and glycidyl ester epoxy resin.

4. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In step S1, the water-based paint is one of water-based acrylic paint, water-based polyurethane paint, water-based alkyd paint and water-based epoxy paint, the silicone is one of silicone oil, silicone rubber and silicone resin, the glass fiber is one of continuous glass fiber and fixed-length glass fiber, and the calcium carbonate is one of heavy calcium carbonate, light calcium carbonate and activated calcium carbonate.

5. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In step S3, the dried high-density polyethylene and polypropylene are first added to the mixing mixer, the mixer is started, and the stirring speed is 300-500r / min, and the stirring is carried out for 2-3min to perform preliminary mixing, and then the pretreated glass fiber is added, and the stirring speed is increased to 500-800r / min, and the stirring is continued for 5-10min to make the glass fiber evenly dispersed in the plastic matrix, and finally the surface-treated calcium carbonate is added, the stirring speed is increased to 800-1000r / min, and the stirring is carried out for 15-30min to mix.

6. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In the granulation step of step S4, the stirred raw materials are added into the hopper of the granulator, and the raw materials are melted and plasticized in the heating zone under the push of the screw, and are evenly mixed under the shearing and kneading of the screw, extruded into strips through the die head, and entered into the granulator for cutting to form granules, and cooled by air cooling to complete the granulation; Injection molding is done by adding granulated particles into the hopper of the injection molding machine, and conveying the particles into the barrel through the rotation of the screw, heating and melting them for plasticization. The screw of the injection molding machine moves forward to inject the molten raw materials into the mold cavity. After the injection is completed, the holding pressure is maintained for further compaction. The barrel body is cooled by the cooling system of the mold for solidification and molding. The mold is opened and the barrel body is removed from the mold to complete the injection molding.

7. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In step S5, 120-grit sandpaper is used for rough grinding of the barrel body to remove the oxide layer, burrs and uneven positions on the surface. After the rough grinding is completed, 300-grit sandpaper is used for fine grinding.

8. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In step S6, the mixer equipment is checked and debugged in advance, a ventilated and dry site is selected and equipped with fire-fighting facilities. The mixing is divided into three steps. Initially, the mixer is started at a low speed, and the materials are added in sequence. The speed is increased and the mixing is continued for 15-20 minutes to achieve preliminary mixing. Then the speed is reduced, fluorocarbon coating and calcium carbonate are added, and the mixing speed is increased and continued. The mixing time is 1 hour, and the temperature and mixing effect are monitored in real time.

9. A high-cleaning internal coating barrel process according to claim 1, characterized in that: When spraying in step S7, filter the paint and pour it into the equipment tank. The operator wears protective equipment, adjusts the distance and angle of the spray gun, sprays at a uniform speed along the predetermined path, and monitors with a thickness gauge to make the coating thickness reach 50-100μm. When drying, put the barrel into the dryer, set the temperature and time according to the characteristics of the paint and the barrel, and dry it. After waiting for the drying to complete and cool down, check the coating hardness, adhesion and appearance.

10. A high-cleaning internal coating barrel process according to claim 1, characterized in that: In step S9, the cleaning performance test is carried out by soaking the inner coating barrel in sewage, taking it out and wiping it, observing the surface wiping state and whether there are stains, and making an assessment; the impact resistance performance test is carried out by using a falling weight of specified mass to freely drop from a height to impact the inner coating barrel, observing the damage, and evaluating the performance according to the standard.

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