A food-grade antibacterial acrylic solid surface material and its preparation method

Abstract

The present invention relates to the technical field of surface material processing, and specifically relates to a food-grade antibacterial acrylic solid surface material and a preparation method thereof, including: an acrylic solid surface material layer and a surface antibacterial functional layer. The raw materials of the antibacterial functional layer are divided into two groups, solid and liquid, according to a specified ratio. The two groups of raw materials are respectively fed into the inner cavity of the mixing cylinder from two feed pipes, and the raw materials are stirred and mixed by a stirring shaft and stirring rods; a colloidal raw material is sprayed on the acrylic solid surface material layer by an atomizing nozzle to form a surface antibacterial functional layer; the beneficial effects are as follows: a stirring shaft is arranged in the inner cavity of the mixing cylinder. When the mixing cylinder rotates, it drives the antibacterial agent in the inner cavity to turn and flow, and drives the stirring shaft to rotate through the viscosity of the antibacterial agent, thereby driving the arc-shaped slide plate to deflect, and connecting one group of feed holes and the feed pipe through a communication hole to automatically add a thickening agent or a liquid solvent into the inner cavity of the mixing cylinder to adjust the viscosity of the antibacterial agent, ensuring a higher quality of the antibacterial layer after spray forming.

Description

Technical Field

[0001] The present invention relates to the technical field of surface material processing, and particularly to a food-grade antibacterial acrylic solid surface material and a preparation method thereof. Background Art

[0002] Acrylic solid surface material is a non-porous homogeneous solid material formed by high-temperature polymerization and curing of a main matrix of methyl methacrylate (MMA) resin and addition of mineral fillers such as aluminum hydroxide.

[0003] In the prior art, a Chinese utility model with the publication number CN213670052U discloses an antibacterial agent spraying device for the surface of acrylic solid surface material. One end of each atomizing nozzle faces the center position of the spraying chamber. The atomized antibacterial agent will be confined to the middle position between two groups of limiting blocks. After the side surface of the limiting block is sprayed with the atomized antibacterial agent, water droplets will form and fall, and the antibacterial agent spraying effect on the acrylic solid surface material is achieved, avoiding the waste of antibacterial agent.

[0004] Currently, the antibacterial layer on the surface of acrylic solid surface material is mostly formed by spraying antibacterial agent, and the antibacterial agent is mostly a viscous gel. During spraying, its viscosity needs to be adjusted in real time, and the existing spraying equipment requires manual adjustment of the raw material ratio, resulting in a low adjustment accuracy of the viscosity of the antibacterial agent, thus leading to insufficient quality of the antibacterial layer after spraying and forming. For this reason, the present invention provides a food-grade antibacterial acrylic solid surface material and a preparation method thereof to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a food-grade antibacterial acrylic solid surface material and a preparation method thereof to solve the problem of poor quality of the antibacterial layer sprayed and formed on the surface of acrylic solid surface material as proposed in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A food-grade antibacterial acrylic solid surface material, comprising: an acrylic solid surface material layer and a surface antibacterial functional layer, and the antibacterial functional layer comprises the following components:

[0007] Antibacterial active ingredient 2.5 - 5.5 wt%

[0008] Film-forming resin 40 - 47.5 wt%

[0009] Viscosity increasing agent 6 - 9 wt%

[0010] Curing agent 10 - 12 wt%

[0011] Auxiliary agent 2.5 - 4 wt%

[0012] Liquid solvent 22 - 39 wt%.

[0013] Preferably, the antibacterial active ingredient includes 0.5-1.5 wt% of nano silver and 2-4 wt% of zinc oxide, and the film-forming resin is acrylic resin.

[0014] Preferably, the tackifier includes 5-10 wt% of chitosan and 1-2 wt% of silane coupling agent, and the curing agent is 10-15 wt% of UV curable monomer.

[0015] Preferably, the auxiliary agent is 2-3 wt% of nano silica and 0.5-1 wt% of food-grade leveling agent.

[0016] Preferably, the liquid solvent is 7-12 wt% of acetone and 15-27 wt% of methyl ester.

[0017] A preparation method of the food-grade antibacterial acrylic solid surface material according to the above, specifically including the following steps:

[0018] Step 1: Divide the raw materials of the antibacterial functional layer into solid and liquid groups according to the specified ratio, send the two groups of raw materials into the inner cavity of the mixing cylinder from two feed pipes respectively, then rotate the mixing cylinder, the mixing cylinder tumbles the raw materials, and the stirring shaft and stirring rod stir and mix the raw materials.

[0019] Step 2: After the raw materials are stirred, they are in a colloidal state with a certain viscosity. The stirring shaft and stirring rod deflect under the action of the viscous force of the colloidal raw materials, and press the spring inside the elastic telescopic rod. According to the magnitude of the viscous force received by the stirring shaft and stirring rod, the arc-shaped slide plate will slide in different directions, and then connect the communication hole to one of the feed pipes, realizing the automatic filling of liquid raw materials or solid raw materials, and automatically adjusting the viscosity of the colloidal raw materials in the inner cavity of the mixing cylinder until the viscosity reaches the predetermined value.

[0020] Step 3: After the colloidal raw materials are stirred and mixed evenly in the inner cavity of the mixing cylinder, start the conveying auger to rotate and convey the colloidal raw materials to the inner cavity of the spraying pipe, and use the atomizing nozzle to spray the colloidal raw materials on the acrylic solid surface layer to form a surface antibacterial functional layer.

[0021] Preferably, the mixing cylinder is rotatably installed between the first side plate and the second side plate. The inner wall of the mixing cylinder is fixed with a turning plate. The stirring shaft is rotatably installed in the inner cavity of the mixing cylinder, and both ends of the stirring shaft respectively pass through the first side plate and the second side plate movably. One end of the stirring shaft is fixed with a transmission gear, and a transmission rack meshing with it is arranged outside the transmission gear. The elastic telescopic rod is fixedly installed on the surface of the first side plate, and the movable end of the elastic telescopic rod is fixedly connected with the transmission rack. A slide rail adapted to it is movably penetrated in the inner cavity of the transmission rack, and blocks are arranged at both ends of the slide rail. The slide rail and the blocks are both fixed on the surface of the first side plate.

[0022] Preferably, an arc-shaped sliding groove is formed inside the first side plate. An arc-shaped sliding plate is slidably installed in the inner cavity of the arc-shaped sliding groove, and the communication hole is located in the middle of the arc-shaped sliding plate. A connecting plate is fixed between the arc-shaped sliding plate and the stirring shaft, and an avoidance groove corresponding to the connecting plate is formed inside the first side plate. Two feeding holes are formed through the surface of the first side plate, and the two feeding holes respectively correspond to the two ends of the arc-shaped sliding groove. Two feeding pipes are respectively and correspondingly communicated with the two feeding holes.

[0023] Preferably, a feeding pipe is fixedly and penetratingly connected to the lower side of the second side plate. A sealing cover is arranged in the middle of the conveying auger. The outer side of the sealing cover is arranged in a "U" shape, and air pipes are communicated with both ends. One of the air pipes is communicated with the inner cavity of one end of the feeding pipe. A conveying auger is rotatably installed in the inner cavity of the feeding pipe. A notch is formed in the middle of the conveying auger, and a driving disk is fixedly installed at the notch. The driving disk is located inside the sealing cover, and grooves are formed in the arc-shaped side wall of the driving disk. One-way holes are formed through the surface of the driving disk, and a one-way valve structure composed of a sealing ball, a return spring and a support plate is arranged in the inner cavity of the one-way holes. An extension section is communicated with the lower side of one end of the feeding pipe, and a spraying pipe is rotatably communicated with one end of the extension section.

[0024] Preferably, the spraying pipe is arranged in an "L" shape, and a vertical driving arm is fixed in the middle of the spraying pipe. A sliding groove is formed through the surface of the driving arm. A turntable is arranged outside the driving arm, and a driving pin fixedly connected with the sliding groove in an activity-penetrating manner is fixed at the edge of the turntable. A polygonal shaft body is fixed in the middle of the turntable. A polygonal slot and a pin shaft hole are formed at one end of the conveying auger. The polygonal shaft body is movably inserted into the inner cavity of the polygonal slot and fixedly connected with the polygonal slot through a connecting pin. The spraying pipe is of a telescopic structure, and a guiding frame is arranged outside the spraying pipe. A limiting sliding groove is formed in the inner wall of the guiding frame. A limiting shaft sliding in the inner cavity of the limiting sliding groove is fixed outside the spraying pipe.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] In the present invention, the mixing cylinder is rotatably installed between the first side plate and the second side plate. A stirring shaft is arranged in the inner cavity of the mixing cylinder. One end of the stirring shaft movably penetrates through the first side plate. Two feeding pipes are connected to the surface of the first side plate and are respectively used for conveying a tackifier and a liquid solvent. An arc-shaped sliding groove is formed inside the first side plate. Feeding holes are formed through both ends of the arc-shaped sliding groove, and the feeding holes correspond to the feeding pipes. An arc-shaped sliding plate is slidably installed in the inner cavity of the arc-shaped sliding groove, and a communication hole is formed in the middle of the arc-shaped sliding plate. The arc-shaped sliding plate is fixedly connected to the stirring shaft. An elastic telescopic rod for resetting the rotation of the stirring shaft is arranged on the outer side of the first side plate. When the mixing cylinder rotates, the antibacterial agent in the inner cavity is driven to flip and flow, and the viscosity of the antibacterial agent drives the stirring shaft to rotate, thereby driving the arc-shaped sliding plate to deflect, so that both ends of the arc-shaped sliding plate just block the two feeding holes. When the viscosity of the antibacterial agent is too high or too low, the arc-shaped sliding plate will slide in different directions in the inner cavity of the arc-shaped sliding groove, and one group of the feeding holes and the feeding pipes are connected through the communication hole to automatically add the tackifier or the liquid solvent into the inner cavity of the mixing cylinder to adjust the viscosity of the antibacterial agent, ensuring a higher quality of the antibacterial layer after spray forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a sectional schematic diagram of the overall structure of the present invention;

[0029] Figure 3 is a schematic diagram of the internal structure of the mixing cylinder of the present invention;

[0030] Figure 4 is a schematic diagram of a partial section of the first side plate structure of the present invention;

[0031] Figure 5 is a schematic diagram of the connection structure of the driving disk and the feeding pipe of the present invention;

[0032] Figure 6 is a schematic diagram of the separation structure of the driving disk and the conveying auger of the present invention;

[0033] Figure 7 is a schematic diagram of the separation structure of the spray pipe and the feeding pipe of the present invention;

[0034] Figure 8 is a schematic diagram of the connection structure of the spray pipe and the guide frame of the present invention;

[0035] Figure 9 is a schematic diagram of the connection structure of the transmission gear and the transmission rack of the present invention;

[0036] Figure 10 For the present invention Figure 5 is an enlarged schematic diagram of the structure at A in;

[0037] Figure 11 For the present invention Figure 7Schematic enlarged view of the structure at B in the [Chinese context].

[0038] In the figure: 1. Mixing cylinder; 11. Material turning plate; 2. Stirring shaft; 21. Stirring rod; 22. Driving gear; 23. Driving rack; 231. Slide rail; 232. Stop block; 24. Elastic telescopic rod; 3. First side plate; 31. Arc-shaped chute; 32. Feeding hole; 33. Feeding pipe; 34. Arc-shaped slide plate; 35. Communication hole; 36. Connecting plate; 37. Avoidance groove; 4. Discharge pipe; 41. Conveyor auger; 411. Polygonal slot; 412. Pin shaft hole; 42. Driving disc; 421. Groove; 422. One-way hole; 423. Sealing ball; 424. Return spring; 425. Support plate; 43. Sealing cover; 431. Air pipe; 44. Extension section; 5. Spraying pipe; 51. Driving arm; 511. Sliding groove; 52. Turntable; 521. Driving pin; 522. Polygonal shaft body; 523. Connecting pin; 53. Atomizing nozzle; 54. Limiting shaft; 6. Guide frame; 61. Limiting chute; 7. Second side plate. Detailed implementation manners

[0039] In order to clearly and completely describe the purpose, technical solution of the present invention, and make the advantages more clearly understood, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0040] Please refer to Figures 1 to 11 , the present invention provides a technical solution:

[0041] Embodiment 1, a food-grade antibacterial acrylic solid surface material, comprising: an acrylic solid surface material layer and a surface antibacterial functional layer, and the antibacterial functional layer includes the following components:

[0042] ‌Antibacterial active ingredient 2.5 - 5.5wt%

[0043] Film-forming resin 40 - 47.5wt%

[0044] Tackifier 6 - 9wt%

[0045] Curing agent 10 - 12wt%

[0046] Auxiliary agent 2.5 - 4wt%

[0047] Liquid solvent 22 - 39wt%.

[0048] Among them, the antibacterial active ingredients include 0.5-1.5 wt% of nano silver and 2-4 wt% of zinc oxide. Nano silver can kill bacteria through contact, and zinc oxide can generate reactive oxygen species (ROS) under light to destroy the microbial membrane, thus achieving an antibacterial effect. The film-forming resin is acrylic resin, which is used to provide film-forming property for the coating, ensure the uniform dispersion of the antibacterial layer and maintain stable adhesion with the acrylic solid surface material layer;

[0049] Furthermore, the tackifier includes 5-10 wt% of chitosan and 1-2 wt% of silane coupling agent. Chitosan enhances the flexibility and antibacterial synergy of the coating, and the silane coupling agent improves the interfacial bonding force. The curing agent is 10-15 wt% of UV curable monomer, such as HDDA - hexanediol diacrylate. The curing agent can also be selected as thermosetting epoxy resin, and a dense cross-linked network is formed through UV or thermal curing to fix the antibacterial layer and improve the durability of the coating;

[0050] Secondly, the additives are 2-3 wt% of nano silica and 0.5-1 wt% of food-grade leveling agent. Nano silica is used to increase the wear resistance of the coating, and the leveling agent can improve the spraying uniformity. The liquid solvent is 7-12 wt% of acetone and 15-27 wt% of methyl ester. In addition, according to actual needs, water can also be selected as the solvent, and the corresponding film-forming resin is waterborne polyurethane (PU).

[0051] The present invention also discloses a preparation method of the food-grade antibacterial acrylic solid surface material according to the above, which specifically includes the following steps:

[0052] Step 1: Divide the raw materials of the antibacterial functional layer into solid and liquid groups according to the specified ratio, and send the two groups of raw materials into the inner cavity of the mixing cylinder 1 from two feeding pipes 33 respectively. Then rotate the mixing cylinder 1, and the mixing cylinder 1 tumbles the raw materials, and the stirring shaft 2 and the stirring rod 21 stir and mix the raw materials;

[0053] Step 2: After the raw materials are stirred, they become a colloidal state with a certain viscosity. The stirring shaft 2 and the stirring rod 21 deflect under the viscous force of the colloidal raw materials and press the spring inside the elastic telescopic rod 24. According to the magnitude of the viscous force received by the stirring shaft 2 and the stirring rod 21, the arc-shaped slide plate 34 will slide in different directions, and then connect the communication hole 35 to one of the feeding pipes 33 to achieve automatic feeding of liquid raw materials or solid raw materials, and automatically adjust the viscosity of the colloidal raw materials in the inner cavity of the mixing cylinder 1 until the viscosity reaches the predetermined value;

[0054] Step 3: After the colloidal raw materials are stirred and mixed evenly in the inner cavity of the mixing cylinder 1, start the conveying auger 41 to rotate and convey the colloidal raw materials to the inner cavity of the spraying pipe 5, and use the atomizing nozzle 53 to spray the colloidal raw materials on the acrylic solid surface material layer to form a surface antibacterial functional layer.

[0055] For the installation of the mixing drum 1, the mixing drum 1 of the present application is rotatably installed between the first side plate 3 and the second side plate 7. The first side plate 3 and the second side plate 7 are both fixed by themselves. An annular gear or an annular tooth groove (not shown in the figure) is further provided on the outer side of the mixing drum 1, and the mixing drum 1 is driven to rotate by an external motor in cooperation with a gear. A turning plate 11 is fixed to the inner wall of the mixing drum 1. When the mixing drum 1 rotates, the turning plate 11 can turn the materials in the inner cavity of the mixing drum 1 to improve the mixing degree. The stirring shaft 2 is rotatably installed in the inner cavity of the mixing drum 1, and both ends of the stirring shaft 2 respectively pass through the first side plate 3 and the second side plate 7 movably. A transmission gear 22 is fixed to one end of the stirring shaft 2, and a transmission rack 23 engaged with the outside of the transmission gear 22 is provided. The transmission rack 23 slides along its own length direction and drives the transmission gear 22 to rotate, and thus can drive the stirring shaft 2 to rotate. On the contrary, when the stirring shaft 2 rotates, it can also drive the transmission rack 23 to slide along its own length direction. The elastic telescopic rod 24 is fixedly installed on the surface of the first side plate 3, and the movable end of the elastic telescopic rod 24 is fixedly connected to the transmission rack 23. Since a spring is built in the elastic telescopic rod 24, the transmission rack 23 always has a tendency to drive the transmission gear 22 to rotate. When the stirring shaft 2 and the stirring rod 21 are deflected due to the viscous force of the colloidal raw material in the inner cavity of the mixing drum 1, if the viscosity of the colloidal raw material is too high, the stirring shaft 2 deflects counterclockwise. On the contrary, if the viscosity of the colloidal raw material is small, the stirring shaft 2 deflects clockwise. If the viscosity of the colloidal raw material is within a predetermined range, the stirring shaft 2 maintains stability under the combined action of the viscous force of the colloidal raw material and the spring force in the inner cavity of the elastic telescopic rod 24 and does not deflect. In addition, a slide rail 231 adapted to the transmission rack 23 is movably penetrated through the inner cavity of the transmission rack 23, and stoppers 232 are provided at both ends of the slide rail 231. The slide rail 231 and the stoppers 232 are both fixed to the surface of the first side plate 3. The setting of the slide rail 231 is mainly used to guide the sliding of the transmission rack 23.

[0056] In order to automatically adjust the viscosity of the colloidal raw material in the inner cavity of the mixing drum 1, the present application also has an arc-shaped chute 31 opened inside the first side plate 3. An arc-shaped slide plate 34 is slidably installed in the inner cavity of the arc-shaped chute 31, and a communication hole 35 is located in the middle of the arc-shaped slide plate 34. A connecting plate 36 is fixed between the arc-shaped slide plate 34 and the stirring shaft 2, and an avoidance groove 37 corresponding to the connecting plate 36 is opened inside the first side plate 3, as Figure 4As shown in the figure, when the stirring shaft 2 deflects counterclockwise, the arc-shaped slide plate 34 slides to the left end of the arc-shaped chute 31 in the inner cavity of the arc-shaped chute 31. Conversely, when the stirring shaft 2 deflects clockwise, the arc-shaped slide plate 34 slides to the right end of the arc-shaped chute 31 in the inner cavity of the arc-shaped chute 31. When the stirring shaft 2 does not deflect, the arc-shaped slide plate 34 is located in the middle area of the inner cavity of the arc-shaped chute 31. Two feeding holes 32 are penetrated and opened on the surface of the first side plate 3, and the two feeding holes 32 correspond to the two ends of the arc-shaped chute 31 respectively. Two feeding pipes 33 correspond to and communicate with the two feeding holes 32 respectively. When the arc-shaped slide plate 34 is located at the left end of the arc-shaped chute 31, the feeding hole 32 at the left end of the arc-shaped chute 31 and the feeding pipe 33 are kept in a communicating state through the communication hole 35. At this time, the liquid raw material is automatically filled into the inner cavity of the mixing cylinder 1 to reduce the viscosity of the colloidal raw material. Conversely, when the arc-shaped slide plate 34 is located at the right end of the arc-shaped chute 31, the feeding hole 32 at the right end of the arc-shaped chute 31 and the feeding pipe 33 are kept in a communicating state through the communication hole 35. At this time, the solid raw material is automatically filled into the inner cavity of the mixing cylinder 1 to increase the viscosity of the colloidal raw material. When the arc-shaped slide plate 34 is located in the middle position of the arc-shaped chute 31, the two feeding holes 32 are blocked by the two ends of the arc-shaped slide plate 34 respectively, and the external raw material does not enter the inner cavity of the mixing cylinder 1.

[0057] In order to discharge the colloidal raw material in the inner cavity of the mixing cylinder 1, the present application also has a discharge pipe 4 fixedly penetrated and connected to the lower side of the second side plate 7. A sealing cover 43 is arranged in the middle of the conveying auger 41. The outer side of the sealing cover 43 is arranged in a "U" shape, and air pipes 431 are communicated with both ends. One of the air pipes 431 is communicated with the inner cavity of one end of the discharge pipe 4, and the other air pipe 431 is communicated with an external air pump. A conveying auger 41 is rotatably installed in the inner cavity of the discharge pipe 4. A notch is arranged in the middle of the conveying auger 41, and a driving disc 42 is fixedly installed at the notch. The driving disc 42 is located in the inner cavity of the sealing cover 43, and a groove 421 is opened on the arc-shaped side wall of the driving disc 42. As Figure 5 and Figure 6As shown in the figure, an external air pump transports high-pressure gas through a trachea 431. When the gas flows, it drives the driving disk 42 to rotate through a groove 421, and further drives the conveying auger 41 to rotate. When the conveying auger 41 rotates, it can convey the colloidal raw material in the inner cavity of the mixing cylinder 1. The colloidal raw material and the high-pressure gas are mixed in the inner cavity of one end of the feeding pipe 4 to facilitate subsequent spraying. In addition, one-way holes 422 are formed through the surface of the driving disk 42, and a one-way valve structure composed of a sealing ball 423, a return spring 424, and a support plate 425 is arranged in the inner cavity of the one-way holes 422. The setting of the one-way valve structure can be used to prevent the gas and materials in the inner cavity of one end of the feeding pipe 4 from being reversely conveyed into the inner cavity of the mixing cylinder 1. Since the conveying auger 41 can always apply pressure to the colloidal raw material in the inner cavity of the other end of the feeding pipe 4 when rotating, the colloidal raw material can pass through the inner cavity of the one-way holes 422 and be squeezed into the inner cavity of one end of the feeding pipe 4. Therefore, the inner cavity of one end of the feeding pipe 4 always maintains a high-pressure state to facilitate subsequent atomized spraying. In addition, an extension section 44 is communicated with the lower side of one end of the feeding pipe 4, and the spraying pipe 5 is rotationally communicated with one end of the extension section 44. The colloidal raw material in the inner cavity of one end of the feeding pipe 4 passes through the extension section 44 together with the high-pressure gas and enters the inner cavity of the spraying pipe 5.

[0058] In order to realize the spraying of the acrylic solid surface layer, the spraying pipe 5 of the present application is set in an "L" shape, and a vertical driving arm 51 is fixed in the middle of the spraying pipe 5. A sliding groove 511 is formed through the surface of the driving arm 51. A turntable 52 is arranged outside the driving arm 51, and a driving pin 521 that is movably connected through the sliding groove 511 is fixed at the edge of the turntable 52. As Figure 7 shown in the figure, when the turntable 52 rotates, it can drive the driving arm 51 and the spraying pipe 5 to swing reciprocally around the end of the extension section 44 through the driving pin 521, so as to change the position and orientation of the lower end of the driving arm 51. A polygonal shaft body 522 is fixed in the middle of the turntable 52. A polygonal slot 411 and a pin shaft hole 412 are formed at one end of the conveying auger 41. The polygonal shaft body 522 is movably inserted into the inner cavity of the polygonal slot 411 and is fixedly connected thereto through a connecting pin 523. As Figure 7 and Figure 11 shown in the figure, it can be seen that when the conveying auger 41 rotates, it can drive the polygonal shaft body 522 to rotate, and further drive the turntable 52 to rotate. In addition, the spraying pipe 5 is a telescopic structure, and a guide frame 6 is arranged outside it. A limiting sliding groove 61 is formed on the inner wall of the guide frame 6. A limiting shaft 54 that slides in the inner cavity of the limiting sliding groove 61 is fixed outside the spraying pipe 5. When the spraying pipe 5 swings reciprocally around the end of the extension section 44, the limiting shaft 54 can slide reciprocally in the inner cavity of the limiting sliding groove 61, so that the atomizing nozzle 53 can reciprocally move in the horizontal direction and automatically change its orientation when moving, thereby realizing large-area spraying on the surface of the acrylic solid surface layer below.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method of a food-grade antibacterial acrylic solid surface material, characterized in that: Specifically, it includes the following steps: Step 1: Divide the raw materials of the antibacterial functional layer into two groups, solid and liquid, according to the specified ratio. Feed the two groups of raw materials into the inner cavity of the mixing cylinder (1) from two feed pipes (33) respectively. Then rotate the mixing cylinder (1). The mixing cylinder (1) tumbles the raw materials, and the stirring shaft (2) and stirring rods (21) stir and mix the raw materials. Step 2: After the raw materials are stirred, they become a colloidal state with a certain viscosity. The stirring shaft (2) and stirring rods (21) deflect under the action of the viscous force of the colloidal raw materials and press on the springs inside the elastic telescopic rods (24). According to the magnitude of the viscous force received by the stirring shaft (2) and stirring rods (21), the arc-shaped slide plate (34) will slide in different directions, thereby connecting the communication hole (35) to one of the feed pipes (33), realizing automatic feeding of liquid or solid raw materials, and automatically adjusting the viscosity of the colloidal raw materials in the inner cavity of the mixing cylinder (1) until the viscosity reaches the predetermined value. Step 3: After the colloidal raw materials are stirred and mixed evenly in the inner cavity of the mixing cylinder (1), start the conveying auger (41) to rotate and convey the colloidal raw materials into the inner cavity of the spraying pipe (5). Use the atomizing nozzle (53) to spray the colloidal raw materials on the acrylic solid surface layer to form a surface antibacterial functional layer. Among them, the mixing cylinder (1) is rotatably installed between the first side plate (3) and the second side plate (7). The stirring shaft (2) is rotatably installed in the inner cavity of the mixing cylinder (1), and both ends of the stirring shaft (2) respectively pass through the first side plate (3) and the second side plate (7) movably. One end of the stirring shaft (2) is fixed with a transmission gear (22), and a transmission rack (23) meshing with it is arranged on the outside of the transmission gear (22). The stirring rods (21) are fixed on the surface of the stirring shaft (2). The elastic telescopic rods (24) are fixedly installed on the surface of the first side plate (3). The movable ends of the elastic telescopic rods (24) are fixedly connected to the transmission rack (23). An arc-shaped chute (31) is opened inside the first side plate (3). The arc-shaped slide plate (34) is slidably installed in the inner cavity of the arc-shaped chute (31). A connecting plate (36) is fixed between the arc-shaped slide plate (34) and the stirring shaft (2), and an avoidance groove (37) corresponding to the connecting plate (36) is opened inside the first side plate (3). The communication hole (35) is located in the middle of the arc-shaped slide plate (34). Two feed holes (32) are penetrated and opened on the surface of the first side plate (3), and the two feed holes (32) respectively correspond to the two ends of the arc-shaped chute (31). The two feed pipes (33) are respectively corresponding and communicated with the two feed holes (32). The lower side of the second side plate (7) is fixedly penetrated and connected with a discharge pipe (4). A conveying auger (41) is rotatably installed in the inner cavity of the discharge pipe (4). One end of the lower side of the discharge pipe (4) is communicated with an extension section (44). The spraying pipe (5) is rotatably communicated with one end of the extension section (44). The atomizing nozzle (53) is installed at the lower end of the spraying pipe (5).

2. The preparation method of the food-grade antibacterial acrylic solid surface material according to claim 1, wherein: The inner wall of the mixing cylinder (1) is fixed with a material turning plate (11). A slide rail (231) adapted to it is movably penetrated through the inner cavity of the transmission rack (23), and stoppers (232) are arranged at both ends of the slide rail (231). The slide rail (231) and the stoppers (232) are both fixed on the surface of the first side plate (3).

3. The preparation method of the food-grade antibacterial acrylic solid surface material according to claim 2, characterized in that: A sealing cover (43) is arranged in the middle of the conveying auger (41). The outer side of the sealing cover (43) is arranged in a "U" shape, and air pipes (431) are connected to both ends. One of the air pipes (431) is communicated with the inner cavity of one end of the feeding pipe (4). A notch is arranged in the middle of the conveying auger (41), and a driving disk (42) is fixedly installed at the notch. The driving disk (42) is located in the inner cavity of the sealing cover (43), and grooves (421) are arranged on the arc-shaped side wall of the driving disk (42). A one-way hole (422) is penetrated through the surface of the driving disk (42), and a one-way valve structure composed of a sealing ball (423), a return spring (424) and a support plate (425) is arranged in the inner cavity of the one-way hole (422).

4. The preparation method of the food-grade antibacterial acrylic solid surface material according to claim 3, characterized in that: The spraying pipe (5) is arranged in an "L" shape, and a vertical driving arm (51) is fixed in the middle of the spraying pipe (5). A sliding groove (511) is penetrated through the surface of the driving arm (51). A turntable (52) is arranged outside the driving arm (51), and a driving pin (521) fixedly connected with the sliding groove (511) is movably penetrated through the edge of the turntable (52). A polygonal shaft body (522) is fixed in the middle of the turntable (52). A polygonal slot (411) and a pin shaft hole (412) are arranged at one end of the conveying auger (41). The polygonal shaft body (522) is movably inserted into the inner cavity of the polygonal slot (411) and fixedly connected with it through a connecting pin (523). The spraying pipe (5) is a telescopic structure, and a guide frame (6) is arranged outside it. A limiting sliding groove (61) is arranged on the inner wall of the guide frame (6). A limiting shaft (54) sliding in the inner cavity of the limiting sliding groove (61) is fixed outside the spraying pipe (5).

5. A food-grade antibacterial acrylic solid surface material, characterized in that: Prepared by using the preparation method of the food-grade antibacterial acrylic solid surface material described in claim 4, the food-grade antibacterial acrylic solid surface material includes: an acrylic solid surface material layer and a surface antibacterial functional layer, and the antibacterial functional layer includes the following components: ‌Antibacterial active ingredient 2.5 - 5.5wt% Film-forming resin 40 - 47.5wt% Tackifier 6 - 9wt% Curing agent 10 - 12wt% Auxiliary agent 2.5 - 4wt% Liquid solvent 22 - 39wt%.

6. A food-grade antibacterial acrylic solid surface material according to claim 5, characterized in that: The ‌antibacterial active ingredient includes 0.5 - 1.5wt% of nano silver and 2 - 4wt% of zinc oxide, and the film-forming resin is ‌acrylic resin.

7. A food-grade antibacterial acrylic solid surface material according to claim 5, characterized in that: The ‌tackifier includes 5 - 10wt% of ‌chitosan and 1 - 2wt% of ‌silane coupling agent, and the curing agent is 10 - 15wt% of ‌UV light-curing monomer.

8. A food-grade antibacterial acrylic solid surface material according to claim 5, characterized in that: The ‌auxiliary agent is 2 - 3wt% of ‌nano silicon dioxide and 0.5 - 1wt% of ‌food-grade leveling agent.

9. A food-grade antibacterial acrylic solid surface material according to claim 5, characterized in that: The ‌liquid solvent is 7 - 12wt% of ‌acetone and 15 - 27wt% of ‌methyl ester.

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