Food-grade antibacterial acrylic solid surface material and preparation method thereof

Abstract

The invention relates to the technical field of plane material processing, in particular to a food-grade antibacterial acrylic solid plane material and a preparation method thereof.The food-grade antibacterial acrylic solid plane material comprises an acrylic solid plane material layer and a surface antibacterial functional layer, raw materials of the antibacterial functional layer are divided into a solid group and a liquid group according to a specified proportion, the two groups of raw materials are fed into an inner cavity of a mixing barrel from two feeding pipes respectively, and the two groups of raw materials are mixed uniformly; the raw materials are stirred and mixed by the stirring shaft and the stirring rod; spraying the colloidal raw material on the acrylic solid surface material layer by using an atomizing nozzle to form a surface antibacterial functional layer; the device has the beneficial effects that the stirring shaft is arranged in the inner cavity of the mixing barrel, the mixing barrel drives an antibacterial agent in the inner cavity to turn over and flow when rotating, the stirring shaft is driven to rotate through the viscous force of the antibacterial agent, then an arc-shaped sliding plate is driven to deflect, and one group of feeding holes and a feeding pipe are communicated through a communicating hole; the device is used for automatically filling a tackifier or a liquid solvent into an inner cavity of a mixing barrel to adjust the viscosity of an antibacterial agent, and it is ensured that the quality of a sprayed and formed antibacterial layer is higher.

Description

Technical Field

[0001] The invention relates to the technical field of surface material processing, in particular 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 with methyl methacrylate (MMA) resin as the main matrix, with mineral fillers such as aluminum hydroxide added, and formed by high-temperature polymerization and curing.

[0003] In the prior art, a Chinese utility model with publication number CN213670052U discloses an antibacterial agent spraying device for the surface of acrylic solid surface materials. One end of the atomizing nozzle is directed toward the center of the spray chamber. The atomized antibacterial agent will be limited to the middle position of the two groups of limiting blocks. After the side of the limiting block is sprayed with the atomized antibacterial agent, water droplets will form and fall, thereby spraying the acrylic solid surface material with the antibacterial agent to avoid waste of the antibacterial agent.

[0004] At present, 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, which needs to adjust its viscosity in real time during spraying, and the existing spraying equipment needs to manually adjust the raw material ratio, and the adjustment accuracy of the viscosity of the antibacterial agent is low, resulting in insufficient quality of the antibacterial layer after spraying. To this end, the present invention proposes a food-grade antibacterial acrylic solid surface material and a preparation method thereof to solve the above problems. Summary of the invention

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

[0006] To achieve the above object, 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, wherein the antibacterial functional layer comprises the following components: ‌ Antimicrobial active ingredients 2.5-5.5wt% Film-forming resin 40-47.5wt% Tackifier 6-9wt% Curing agent 10-12wt% Additives 2.5-4wt% Liquid solvent 22-39wt%.

[0007] Preferably, the antibacterial active ingredients include 0.5-1.5wt% nanosilver and 2-4wt% zinc oxide, and the film-forming resin is acrylic resin.

[0008] Preferably, the tackifier comprises 5-10 wt % of chitosan and 1-2 wt % of a silane coupling agent, and the curing agent is 10-15 wt % of a UV light curing monomer.

[0009] Preferably, the auxiliary agent is 2-3wt% nano silicon dioxide and 0.5-1wt% food grade leveling agent.

[0010] Preferably, the liquid solvent is 7-12 wt % acetone and 15-27 wt % methyl ester.

[0011] A method for preparing the above-mentioned food-grade antibacterial acrylic solid surface material specifically comprises the following steps: Step 1: Divide the raw materials of the antibacterial functional layer into two groups, solid and liquid, according to a specified ratio, and feed the two groups of raw materials into the inner cavity of the mixing drum from two feeding pipes respectively, and then rotate the mixing drum to turn the raw materials, and stir and mix the raw materials by the stirring shaft and the stirring rod; Step 2: After the raw materials are stirred, they become colloid with a certain viscosity. The stirring shaft and the stirring rod are deflected under the viscous force of the colloid raw materials, and the spring built into the elastic telescopic rod is pressed. According to the magnitude of the viscous force on the stirring shaft and the stirring rod, the arc-shaped slide plate slides in different directions, and then the connecting hole is connected to one of the feeding pipes, so as to realize automatic filling of liquid raw materials or solid raw materials, and automatically adjust the viscosity of the colloid raw materials in the inner cavity of the mixing barrel until the viscosity reaches a predetermined value; Step 3: After the colloidal raw materials are stirred and mixed evenly in the inner cavity of the mixing barrel, the conveying auger is started to rotate and convey the colloidal raw materials to the inner cavity of the spray tube, and the colloidal raw materials are sprayed on the acrylic solid surface material layer by an atomizing nozzle to form a surface antibacterial functional layer.

[0012] Preferably, the mixing drum is rotatably installed between side panel one and side panel two, a turning plate is fixed to the inner wall of the mixing drum, a stirring shaft is rotatably installed in the inner cavity of the mixing drum, and both ends of the stirring shaft movably penetrate the side panel one and the side panel two respectively, a transmission gear is fixed to one end of the stirring shaft, and a transmission rack meshing with the transmission gear is provided on the outer side of the transmission gear, an elastic telescopic rod is fixedly installed on the surface of side panel one and the movable end of the elastic telescopic rod is fixedly connected to the transmission rack, a slide rail matching with the transmission rack is movably provided in the inner cavity of the transmission rack, and blocks are provided at both ends of the slide rail, and the slide rail and the block are both fixed to the surface of side panel one.

[0013] Preferably, an arc-shaped slide groove is opened inside the side plate one, the arc-shaped slide plate is slidably installed in the inner cavity of the arc-shaped slide groove, and the connecting hole is located in the middle of the arc-shaped slide plate, a connecting plate is fixed between the arc-shaped slide plate and the stirring shaft, and an avoidance groove corresponding to the connecting plate is opened inside the side plate one, two feed holes are opened through the surface of the side plate one, and the two feed holes correspond to the two ends of the arc-shaped slide groove respectively, and the two feed pipes are connected to the two feed holes respectively.

[0014] Preferably, a feed pipe is fixedly connected through the lower side of the second side panel, a sealing cover is provided in the middle of the conveying auger, the outer side of the sealing cover is arranged in a "U" shape, and air pipes are connected at both ends, one of the air pipes is connected with the inner cavity of one end of the feed pipe, a feed auger is rotatably installed in the inner cavity of the feed pipe, a notch is provided in the middle of the feed auger, and a driving disk is fixedly installed at the notch, the driving disk is located in the inner cavity of the sealing cover, and a groove is provided on the arc-shaped side wall of the driving disk, a one-way hole is provided 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 provided in the inner cavity of the one-way hole, an extension section is connected to the lower side of one end of the feed pipe, and the spray pipe is rotatably connected to one end of the extension section.

[0015] Preferably, the spray pipe is arranged in an "L" shape, and a vertical driving arm is fixed in the middle of the spray pipe, a sliding groove is opened through the surface of the driving arm, a turntable is arranged on the outside of the driving arm, and a driving pin movably connected to the sliding groove 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 opened at one end of the conveying auger, the polygonal shaft body is movably inserted in the inner cavity of the polygonal slot and fixedly connected thereto through a connecting pin, the spray pipe is a telescopic structure, and a guide frame is arranged on the outside, a limiting slot is opened on the inner wall of the guide frame, and a limiting shaft sliding in the inner cavity of the limiting slot is fixed to the outside of the spray pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention is characterized in that the mixing drum is rotatably installed between the side plate one and the side plate two, the inner cavity of the mixing drum is provided with a stirring shaft, one end of the stirring shaft movably penetrates the side plate one, two feeding pipes are connected to the surface of the side plate one for conveying the thickener and the liquid solvent respectively, an arc-shaped slide groove is provided inside the side plate one, both ends of the arc-shaped slide groove are penetrated with feeding holes, and the feeding holes correspond to the feeding pipes, an arc-shaped slide plate is slidably installed in the inner cavity of the arc-shaped slide groove, a connecting hole is provided in the middle of the arc-shaped slide plate, the arc-shaped slide plate is fixedly connected to the stirring shaft, and a rotating shaft for the stirring shaft is provided on the outer side of the side plate one The elastic telescopic rod is used for resetting. When the mixing barrel rotates, it drives the antibacterial agent in the inner cavity to flip and flow, and the viscosity of the antibacterial agent drives the stirring shaft to rotate, thereby driving the arc-shaped slide plate to deflect, so that the two ends of the arc-shaped slide plate just block the two feed holes. When the viscosity of the antibacterial agent is too large or too small, the arc-shaped slide plate will slide in different directions in the inner cavity of the arc-shaped slide groove, and connect one group of feed holes and feed pipes through the connecting hole, so as to automatically add thickener or liquid solvent to the inner cavity of the mixing barrel to adjust the viscosity of the antibacterial agent, thereby ensuring a higher quality of the antibacterial layer after spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the mixing cylinder of the present invention; Figure 4 It is a partially cutaway schematic diagram of a structure of a side panel of the present invention; Figure 5 This is a schematic diagram of the connection between the drive disc and the feed pipe structure of the present invention; Figure 6 This is a schematic diagram of the separation of the drive disc and the conveying auger structure of the present invention; Figure 7 This is a schematic diagram of the separation of the spray pipe and the feeding pipe structure of the present invention; Figure 8 This is a schematic diagram of the connection between the spray pipe and the guide frame structure of the present invention; Fig. 9 It is a schematic diagram of the connection between the transmission gear and the transmission rack structure of the present invention; Fig.10 For the present invention Figure 5 A schematic diagram of the structure enlargement in the middle; Fig.11 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B in the middle.

[0018] In the figure: 1, mixing barrel; 11, turning plate; 2, stirring shaft; 21, stirring rod; 22, transmission gear; 23, transmission rack; 231, slide rail; 232, stopper; 24, elastic telescopic rod; 3, side plate 1; 31, arc slide; 32, feed hole; 33, feed pipe; 34, arc slide plate; 35, connecting hole; 36, connecting plate; 37, avoidance groove; 4, discharge pipe; 41, conveying auger; 411, polygonal slot; 412, pin hole ; 42. Drive disk; 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. Spray pipe; 51. Drive arm; 511. Sliding groove; 52. Turntable; 521. Drive pin; 522. Polygonal shaft; 523. Connecting pin; 53. Atomizing nozzle; 54. Limiting shaft; 6. Guide frame; 61. Limiting slide groove; 7. Side panel two. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail 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, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 11, the present invention provides a technical solution: Embodiment 1, a food-grade antibacterial acrylic solid surface material, comprising: an acrylic solid surface material layer and a surface antibacterial functional layer, wherein the antibacterial functional layer comprises the following components: ‌ Antimicrobial active ingredients 2.5-5.5wt% Film-forming resin 40-47.5wt% Tackifier 6-9wt% Curing agent 10-12wt% Additives 2.5-4wt% Liquid solvent 22-39wt%.

[0021] Among them, the antibacterial active ingredients include 0.5-1.5wt% nanosilver and 2-4wt% zinc oxide. Nanosilver can kill bacteria by contact, and zinc oxide can produce reactive oxygen species (ROS) under light to destroy microbial membranes, thereby achieving an antibacterial effect. The film-forming resin is acrylic resin, which is used to provide film-forming properties of the coating, ensure that the antibacterial layer is evenly dispersed and maintains stable adhesion to the acrylic solid surface layer; Furthermore, the viscosity enhancer includes chitosan 5-10wt% and silane coupling agent 1-2wt%, chitosan enhances the flexibility and antibacterial synergy of the coating, silane coupling agent enhances the interfacial bonding strength, the curing agent is UV light curing monomer 10-15wt%, such as HDDA-hexanediol diacrylate, the curing agent can also be selected as heat-curing epoxy resin, through UV or heat curing to form a dense cross-linked network, fix the antibacterial layer and improve the durability of the coating; Secondly, the additives are 2-3wt% nano-silicon dioxide and 0.5-1wt% food-grade leveling agent. Nano-silicon dioxide is used to increase the wear resistance of the coating, and the leveling agent can improve the uniformity of spraying. The liquid solvent is 7-12wt% acetone and 15-27wt% methyl ester. In addition, according to actual needs, water can also be selected as the solvent, and the corresponding film-forming resin is water-based polyurethane (PU).

[0022] The present invention also discloses a method for preparing the food-grade antibacterial acrylic solid surface material, which specifically comprises the following steps: Step 1: Divide the raw materials of the antibacterial functional layer into two groups of solid and liquid according to a specified ratio, feed the two groups of raw materials into the inner cavity of the mixing drum 1 from two feeding pipes 33 respectively, and then rotate the mixing drum 1 to turn the raw materials, and stir and mix the raw materials by the stirring shaft 2 and the stirring rod 21; Step 2: After the raw materials are stirred, they become colloid with a certain viscosity. The stirring shaft 2 and the stirring rod 21 are deflected under the viscous force of the colloid raw materials, and the spring built into the elastic telescopic rod 24 is pressed. According to the magnitude of the viscous force on the stirring shaft 2 and the stirring rod 21, the arc-shaped slide plate 34 slides in different directions, and then the connecting hole 35 is connected to one of the feed pipes 33, so as to realize automatic filling of liquid raw materials or solid raw materials, and automatically adjust the viscosity of the colloid raw materials in the inner cavity of the mixing barrel 1 until the viscosity reaches a predetermined value; Step 3: After the colloidal raw material is stirred and mixed evenly in the inner cavity of the mixing barrel 1, the conveying auger 41 is started to rotate and convey the colloidal raw material to the inner cavity of the spray pipe 5, and the colloidal raw material is sprayed on the acrylic solid surface material layer by the atomizing nozzle 53 to form a surface antibacterial functional layer.

[0023] In order to install the mixing drum 1, the mixing drum 1 of the present application is rotatably installed between the side plate 1 3 and the side plate 2 7, and the side plate 1 3 and the side plate 2 7 themselves remain fixed. An annular gear ring or annular gear groove (not shown) is also provided on the outer side of the mixing drum 1, and the mixing drum 1 is driven to rotate by an external motor and a gear. A turning plate 11 is fixed on the inner wall of the mixing drum 1. When the mixing drum 1 rotates, the turning plate 11 can turn over 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 the two ends of the stirring shaft 2 are respectively movable through the side plate 1 3 and the side plate 2 7. A transmission gear 22 is fixed at one end of the stirring shaft 2, and a transmission rack 23 meshing with the transmission gear 22 is provided on the outer side of the transmission gear 22. The transmission rack 23 slides along its own length direction and drives the transmission gear 22 to rotate, thereby driving the stirring shaft 2 to rotate. Conversely, when the stirring shaft 2 rotates, it can also drive the transmission rack 23 to slide along its own length direction, and the elastic telescopic rod 24 is fixedly installed on the side plate 1 3 The movable end of the elastic telescopic rod 24 is fixedly connected to the transmission rack 23. Since the elastic telescopic rod 24 has a built-in spring, the transmission rack 23 always has the tendency to drive the transmission gear 22 to rotate. When the stirring shaft 2 and the stirring rod 21 are deflected by the viscosity of the colloidal raw material in the inner cavity of the mixing barrel 1, if the viscosity of the colloidal raw material is too large, the stirring shaft 2 deflects in the counterclockwise direction. On the contrary, if the viscosity of the colloidal raw material is small, the stirring shaft 2 deflects in the clockwise direction. If the viscosity of the colloidal raw material is within a predetermined range, the stirring shaft 2 remains stable and does not deflect under the combined action of the viscosity of the colloidal raw material and the spring force in the inner cavity of the elastic telescopic rod 24. In addition, a slide rail 231 matching with it is arranged through the inner cavity of the transmission rack 23, and blocks 232 are arranged at both ends of the slide rail 231. The slide rail 231 and the block 232 are fixed to the surface of the side plate 3. The setting of the slide rail 231 is mainly used to guide the sliding of the transmission rack 23.

[0024] In order to automatically adjust the viscosity of the colloidal raw material in the inner cavity of the mixing barrel 1, the present application also has an arc-shaped slide groove 31 opened inside the side plate 3, an arc-shaped slide plate 34 is slidably installed in the inner cavity of the arc-shaped slide groove 31, and the connecting 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 side plate 3, such as Figure 4 As shown in FIG. 1 , when the stirring shaft 2 deflects counterclockwise, the arc slide 34 slides in the inner cavity of the arc chute 31 to the left end of the arc chute 31. On the contrary, when the stirring shaft 2 deflects clockwise, the arc slide 34 slides in the inner cavity of the arc chute 31 to the right end of the arc chute 31. When the stirring shaft 2 does not deflect, the arc slide 34 is located in the middle area of ​​the inner cavity of the arc chute 31. Two feeding holes 32 are formed through the surface, and the two feeding holes 32 correspond to the two ends of the arc-shaped chute 31 respectively, and the two feeding pipes 33 are connected 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 connected through the connecting hole 35. At this time, the liquid raw material is automatically added into the inner cavity of the mixing barrel 1 to reduce the viscosity of the colloidal raw material. On the contrary, 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 connected through the connecting hole 35. At this time, the solid raw material is automatically added into the inner cavity of the mixing barrel 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 barrel 1.

[0025] In order to discharge the colloidal raw materials in the inner cavity of the mixing barrel 1, the present application also has a feed pipe 4 fixedly connected to the lower side of the 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 both ends are connected with air pipes 431, one of the air pipes 431 is connected to the inner cavity of one end of the feed pipe 4, and the other air pipe 431 is connected to an external air pump, and a conveying auger 41 is rotatably installed in the inner cavity of the feed 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 a groove 421 is opened on the arc-shaped side wall of the driving disk 42, such as Figure 5 and Figure 6As shown, an external air pump delivers high-pressure gas through the air pipe 431. When the gas flows, the driving disc 42 is driven to rotate through the groove 421, thereby driving the conveying auger 41 to rotate. When the conveying auger 41 rotates, the colloidal raw material in the inner cavity of the mixing barrel 1 can be delivered. The colloidal raw material and the high-pressure gas are mixed in the inner cavity of one end of the discharge pipe 4 to facilitate subsequent spraying. In addition, a one-way hole 422 is opened through the surface of the driving disc 42, and a one-way valve structure composed of a sealing ball 423, a return spring 424 and a support plate 425 is provided in the inner cavity of the one-way hole 422. The setting of the one-way valve structure can be used to avoid the discharge pipe 4 The gas and material in the inner cavity at one end are reversely transported to the inner cavity of the mixing barrel 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 discharge pipe 4 when it rotates, the colloidal raw material can pass through the inner cavity of the one-way hole 422 and be squeezed into the inner cavity of one end of the discharge pipe 4. Therefore, the inner cavity at one end of the discharge pipe 4 always maintains a high-pressure state to facilitate subsequent atomization spraying. In addition, an extension section 44 is connected to the lower side of one end of the discharge pipe 4, and the spray pipe 5 is rotated to be connected to the extension section 44. The colloidal raw material in the inner cavity of one end of the discharge pipe 4 passes through the extension section 44 together with the high-pressure gas and enters the inner cavity of the spray pipe 5.

[0026] In order to realize the spraying of the acrylic solid surface material layer, the spraying tube 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 tube 5, a sliding groove 511 is penetrated through the surface of the driving arm 51, a turntable 52 is arranged on the outside of the driving arm 51, and a driving pin 521 movably penetrated and connected with the sliding groove 511 is fixed at the edge of the turntable 52, such as Figure 7 As shown, when the turntable 52 rotates, the driving pin 521 can drive the driving arm 51 and the spray pipe 5 to swing back and forth around the end of the extension section 44, thereby changing the position and direction of the lower end of the driving arm 51. A polygonal shaft 522 is fixed in the middle of the turntable 52, and a polygonal slot 411 and a pin shaft hole 412 are opened at one end of the conveying auger 41. The polygonal shaft 522 is movably inserted into the inner cavity of the polygonal slot 411 and fixedly connected thereto through a connecting pin 523. Figure 7 and Fig.11 As shown, the conveying auger 41 can drive the polygonal shaft 522 to rotate when rotating, and then drive the turntable 52 to rotate. In addition, the spray tube 5 is a telescopic structure, and a guide frame 6 is arranged on the outside. A limiting slide groove 61 is provided on the inner wall of the guide frame 6. A limiting shaft 54 ​​sliding in the inner cavity of the limiting slide groove 61 is fixed on the outside of the spray tube 5. When the spray tube 5 swings back and forth around the end of the extension section 44, the limiting shaft 54 ​​can slide back and forth in the inner cavity of the limiting slide groove 61, so that the atomizing nozzle 53 can reciprocate in the horizontal direction and automatically change its direction when moving, thereby realizing large-area spraying of the surface of the acrylic solid surface material layer below.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a food-grade antibacterial acrylic solid surface material, characterized in that: The specific steps include: Step 1: Divide the raw materials of the antibacterial functional layer into two groups, solid and liquid, according to a specified ratio, and feed the two groups of raw materials into the inner cavity of the mixing drum (1) from two feeding pipes (33) respectively, and then rotate the mixing drum (1) to turn the raw materials, and stir and mix the raw materials by the stirring shaft (2) and the stirring rod (21); Step 2: After the raw materials are stirred, they become a colloid with a certain viscosity. The stirring shaft (2) and the stirring rod (21) are deflected under the viscous force of the colloid raw materials, and pressure is applied to the spring built into the elastic telescopic rod (24). According to the magnitude of the viscous force applied to the stirring shaft (2) and the stirring rod (21), the arc-shaped slide plate (34) slides in different directions, thereby connecting the connecting hole (35) to one of the feed pipes (33), thereby automatically adding liquid raw materials or solid raw materials, and automatically adjusting the viscosity of the colloid raw materials in the inner cavity of the mixing barrel (1), until the viscosity reaches a predetermined value; Step 3: After the colloidal raw material is stirred and mixed evenly in the inner cavity of the mixing barrel (1), the conveying auger (41) is started to rotate and convey the colloidal raw material to the inner cavity of the spray pipe (5), and the colloidal raw material is sprayed on the acrylic solid surface material layer using the atomizing nozzle (53) to form a surface antibacterial functional layer.

2. The method for preparing the food-grade antibacterial acrylic solid surface material according to claim 1, characterized in that: The mixing drum (1) is rotatably mounted between the side plate 1 (3) and the side plate 2 (7); a material turning plate (11) is fixed to the inner wall of the mixing drum (1); a stirring shaft (2) is rotatably mounted in the inner cavity of the mixing drum (1); and two ends of the stirring shaft (2) respectively movably penetrate the side plate 1 (3) and the side plate 2 (7); a transmission gear (22) is fixed to one end of the stirring shaft (2); and a transmission rack (23) meshing with the transmission gear (22) is arranged on the outer side of the transmission gear (22); an elastic telescopic rod (24) is fixedly mounted on the surface of the side plate 1 (3); and the movable end of the elastic telescopic rod (24) is fixedly connected to the transmission rack (23); a slide rail (231) matching with the transmission rack (23) is movably arranged in the inner cavity of the transmission rack (23); and both ends of the slide rail (231) are provided with stoppers (232); and the slide rail (231) and the stoppers (232) are both fixed to the surface of the side plate 1 (3).

3. The method for preparing the food-grade antibacterial acrylic solid surface material according to claim 2, characterized in that: An arc-shaped slide groove (31) is provided inside the side plate (3), an arc-shaped slide plate (34) is slidably mounted in the inner cavity of the arc-shaped slide groove (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 provided inside the side plate (3), two feed holes (32) are provided through the surface of the side plate (3), and the two feed holes (32) correspond to the two ends of the arc-shaped slide groove (31), respectively, and two feed pipes (33) are respectively connected to the two feed holes (32).

4. The method for preparing the food-grade antibacterial acrylic solid surface material according to claim 3, characterized in that: A feeding pipe (4) is fixedly connected and penetrated through 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 both ends are connected with air pipes (431), one of the air pipes (431) is connected with the inner cavity of one end of the feeding pipe (4), the inner cavity of the feeding pipe (4) is rotatably mounted with the feeding auger (41), a notch is arranged in the middle of the feeding auger (41), and a driving disc (42) is fixedly mounted at the notch, and the driving disc (42) is driven by the driving disc (42). The moving disk (42) is located in the inner cavity of the sealing cover (43), and a groove (421) is provided on the arc-shaped side wall of the driving disk (42). A one-way hole (422) is provided 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 provided in the inner cavity of the one-way hole (422). An extension section (44) is connected to the lower side of one end of the discharge pipe (4), and the spray pipe (5) is rotatably connected to one end of the extension section (44).

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

6. A food-grade antibacterial acrylic solid surface material, characterized by: The food-grade antibacterial acrylic solid surface material is prepared by the preparation method of claim 5, wherein the food-grade antibacterial acrylic solid surface material comprises: an acrylic solid surface material layer and a surface antibacterial functional layer, wherein the antibacterial functional layer comprises the following components: ‌ Antimicrobial active ingredients 2.5-5.5wt% Film-forming resin 40-47.5wt% Tackifier 6-9wt% Curing agent 10-12wt% Additives 2.5-4wt% Liquid solvent 22-39wt%.

7. The food-grade antibacterial acrylic solid surface material according to claim 6, characterized in that: The antibacterial active ingredients include 0.5-1.5wt% nanosilver and 2-4wt% zinc oxide, and the film-forming resin is acrylic resin.

8. The food-grade antibacterial acrylic solid surface material according to claim 6, characterized in that: The viscosity enhancer includes 5-10 wt % of chitosan and 1-2 wt % of a silane coupling agent, and the curing agent is 10-15 wt % of a UV light curing monomer.

9. The food-grade antibacterial acrylic solid surface material according to claim 6, characterized in that: The auxiliary agent is 2-3wt% of nano silicon dioxide and 0.5-1wt% of food-grade leveling agent.

10. The food-grade antibacterial acrylic solid surface material according to claim 6, characterized in that: The liquid solvent is 7-12 wt % acetone and 15-27 wt % methyl ester.

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