Polyurethane foam composite board and preparation method thereof

Abstract

The present invention relates to the technical field of polymer materials, and more specifically to a polyurethane foam composite board and a preparation method thereof, the method comprising the following steps: S1, pressing two metal plates into the shapes of a lower cover 5 and an upper cover 7 respectively; S2, cleaning the surfaces of the two metal plates; S3, placing a rat repellent, polyisocyanate, polyether polyol and a foaming agent in an injection device; S4, combining the two pressed metal plates in the injection device to form a cavity; S5, injecting the rat repellent, polyisocyanate, polyether polyol and a foaming agent into the cavity by using the injection device; S6, moving the two metal plates covered with the rat repellent, polyisocyanate, polyether polyol and a foaming agent into a mold by using the injection device. The method has the beneficial effect of preventing mice from damaging the polyurethane foam in the polyurethane foam composite board and prolonging the service life of the polyurethane foam composite board.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and more specifically to a polyurethane foam composite board and a preparation method thereof. Background Art

[0002] Polyurethane foam composite panels are generally used as the outer roof panels of buildings. The panels have good thermal insulation, heat insulation and sound insulation effects, and polyurethane is non-combustible and meets fire safety requirements. The upper and lower panels plus polyurethane have high strength and rigidity. The lower panel is smooth and flat, with clear lines, which increases the beauty and flatness of the interior. It is easy to install, short in construction period, and beautiful, and is a new type of building material.

[0003] The existing polyurethane foam composite board is easy to be eaten by mice after installation. Once the polyurethane foam in the polyurethane foam composite board is missing, the polyurethane foam composite board loses its original thermal insulation performance. Since the missing part is the sandwich part, it is time-consuming and laborious to fill it. At present, there is a lack of a polyurethane foam composite board and a preparation method thereof that can prevent mice from damaging the polyurethane foam in the polyurethane foam composite board and extend the service life of the polyurethane foam composite board. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a polyurethane foam composite board and a preparation method thereof, which can prevent mice from damaging the polyurethane foam in the polyurethane foam composite board and prolong the service life of the polyurethane foam composite board.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for preparing a polyurethane foam composite board, the method comprising the following steps:

[0007] S1, pressing two metal plates into the shapes of a lower cover 5 and an upper cover 7 respectively;

[0008] S2. Clean the surfaces of the two metal plates;

[0009] S3, placing the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the injection device;

[0010] S4, combining two pressed metal plates in an injection device to form a cavity;

[0011] S5, injecting the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the cavity using an injection device;

[0012] S6, moving the two metal plates covered with the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the mold using an injection device;

[0013] S7, keeping the mold still and waiting for the polyisocyanate and polyether polyol in the cavity to completely react with the blowing agent to foam and solidify;

[0014] S8, demoulding is performed, and the two metal plates in the mold are taken out to obtain a polyurethane foam composite board.

[0015] The material of the metal plate in step S1 is iron or aluminum.

[0016] The polyurethane foam composite board comprises the following raw materials in proportion by weight: 20-25% of iron or aluminum, 30-33% of polyisocyanate, 30-33% of polyether polyol, 5-8% of hydrofluoric acid and the remainder of rodent repellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a schematic diagram of a process for preparing a polyurethane foam composite board in the present invention;

[0019] Figure 2 The structure of the injection device in the present invention is schematically shown in FIG. Figure 1 ;

[0020] Figure 3 The structure of the injection device in the present invention is schematically shown in FIG. Figure 2 ;

[0021] Figure 4 It is a schematic diagram of the structure of the base frame and the injection cylinder in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the bottom frame and the blocking frame in the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the lower cover and the upper cover in the present invention;

[0024] Figure 7 It is a schematic diagram of the structure of the injection cylinder and the rotating chamber in the present invention;

[0025] Figure 8 It is a cross-sectional view of the charging barrel A in the present invention;

[0026] Fig. 9 It is a structural schematic diagram of the bearing plate and the top plate in the present invention;

[0027] Fig.10 It is a schematic diagram of the structure of the push plate and the connecting frame in the present invention;

[0028] Fig.11 It is a partial enlarged view of the baffle and the positioning groove in the present invention;

[0029] Fig.12 It is a structural schematic diagram of the plug board in the present invention;

[0030] Fig.13 It is a schematic diagram of the structure of the mold box and the baffle in the present invention.

[0031] In the figure: base frame 1; injection cylinder 2; rubber column 3; bearing plate 4; lower cover 5; bent edge 6; upper cover 7; rotating bin 8; discharge port 9; charging cylinder A10; charging cylinder B11; feeding pipe 12; stirring rod 13; stirring block 14; top plate 15; spring A16; ring 17; cylinder 18; mold box 19; blocking frame 20; push plate 21; spring B22; triangular plate 23; connecting frame 24; positioning plate 25; notch 26; baffle 27; positioning groove 28; plug plate 29. DETAILED DESCRIPTION

[0032] refer to Figure 1 , a method for preparing a polyurethane foam composite board, the method comprising the following steps:

[0033] S1, pressing two metal plates into the shapes of a lower cover 5 and an upper cover 7 respectively;

[0034] S2. Clean the surfaces of the two metal plates;

[0035] S3, placing the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the injection device;

[0036] S4, combining two pressed metal plates in an injection device to form a cavity;

[0037] S5, injecting the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the cavity using an injection device;

[0038] S6, moving the two metal plates covered with the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the mold using an injection device;

[0039] S7, keeping the mold still and waiting for the polyisocyanate and polyether polyol in the cavity to completely react with the blowing agent to foam and solidify;

[0040] S8, demoulding is performed, and the two metal plates in the mold are taken out to obtain a polyurethane foam composite board.

[0041] By adding rat repellent to polyisocyanate, polyether polyol and foaming agent, the produced polyurethane foam composite board will produce a smell that is disgusting to mice. In this way, mice will stay away from the rat repellent odor emitted from the polyurethane foam composite board, and mice will not damage the polyurethane foam in the polyurethane foam composite board, thereby preventing mice from damaging the polyurethane foam in the polyurethane foam composite board and extending the service life of the polyurethane foam composite board.

[0042] The material of the metal plate in step S1 is iron or aluminum. Iron and aluminum have certain ductility and low cost. Iron and aluminum also have certain wear resistance, which further increases the service life of the polyurethane composite plate.

[0043] In step S3, the rodent repellent is peppermint oil or star anise oil, and the foaming agent is hydrofluoric acid. Peppermint oil and star anise oil are almost harmless to the human body, but the smell they produce can keep mice away.

[0044] The injection time in step S5 is 75 seconds, and the temperature of the rodent repellent, polyisocyanate, polyether polyol and foaming agent is 23° C. during the injection.

[0045] The static waiting time in step S7 is 25 hours.

[0046] refer to Figures 1 to 7 According to the figure, the process of injecting rodent repellent, polyisocyanate, polyether polyol and foaming agent into the cavity can be obtained:

[0047] The injection device of the present invention comprises a base frame 1 and an injection barrel 2 fixedly connected to the base frame 1, a rubber column 3 is slidably connected in the injection barrel 2, a bearing plate 4 is slidably connected to the base frame 1, a lower cover 5 is arranged on the bearing plate 4, two curved edges 6 are arranged on the upper part of the lower cover 5, and an upper cover 7 is slidably connected to the upper end of the lower cover 5. When the rubber column 3 slides to the rear end, the rodent repellent, polyisocyanate, polyether polyol and foaming agent are added to the injection barrel 2, the bearing plate 4 is first slid downward, and then the operator places a bent sheet on the bearing plate 4. The lower cover 5 is moved upwards, and the two bent edges 6 on the lower cover 5 are moved upwards. Then, the carrier plate 4 is moved upwards with the lower cover 5. Then, the operator places an upper cover 7 on the top of the syringe 2, and then the carrier plate 4 continues to move upwards with the lower cover 5. The lower cover 5 moving upwards will drive the two bent edges 6 to move upwards together. The two bent edges 6 moving upwards will contact the upper cover 7 held by the operator, and then the carrier plate 4 is moved upwards continuously, so that the left and right ends of the upper cover 7 will open the two bent edges 6 and enter the interior of the lower cover 5. In this way, the lower cover 5 and the upper cover 7 form a cavity that is connected front to back and blocked up and down, so that the front end of the injection barrel 2 is located in the cavity, and then the rubber column 3 is allowed to slide toward the front end in the injection barrel 2, so that the rubber column 3 will push the rodent repellent, polyisocyanate, polyether polyol and foaming agent in the injection barrel 2 to move toward the front end, so that the rodent repellent, polyisocyanate, polyether polyol and foaming agent originally located in the injection barrel 2 will be ejected from the front end of the injection barrel 2, and at the same time, the lower cover 5 and the upper cover 7 are moved toward the front end together with the rubber column 3, so as to keep the front end of the injection barrel 2 The rodent repellent does not move, and the cavity slowly moves toward the front end, so that the rodent repellent, polyisocyanate, polyether polyol and foaming agent ejected from the syringe 2 will cover the inner walls of the lower cover 5 and the upper cover 7, so that the polyisocyanate and polyether polyol in the cavity will be foamed by the foaming agent to produce polyurethane foam, and the rodent repellent entering the cavity will enter the foam, so that the rodent repellent will produce an odor, and mice will stay away from the odor without damaging the polyurethane foam, thereby obtaining the process of injecting the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the cavity.

[0048] refer to Figures 1 to 7 According to the figure, the process of evenly spreading the rodent repellent, polyisocyanate, polyether polyol and foaming agent on the inner wall of the cavity can be obtained:

[0049] The front end of the injection barrel 2 of the present invention is rotatably connected to a rotating bin 8, and four discharge ports 9 are provided on the rotating bin 8. Through the forward sliding of the rubber column 3, the rubber column 3 will push the rat repellent, polyisocyanate, polyether polyol and foaming agent in the injection barrel 2 into the rotating bin 8, and then the rubber column 3 will continue to slide toward the front end, so that after the interior of the rotating bin 8 is filled, new rat repellent, polyisocyanate, polyether polyol and foaming agent will enter the rotating bin 8, so that the newly-incoming rat repellent, polyisocyanate, polyether polyol and foaming agent will squeeze out the first-incoming rat repellent, polyisocyanate, polyether polyol and foaming agent from the four discharge ports 9. Since the four discharge ports 9 are arranged to be bent clockwise, the rat repellent, polyisocyanate, polyether polyol and foaming agent ejected from the four discharge ports 9 will produce opposite effects. Use force to make the rotating bin 8 rotate counterclockwise, so that the rotating bin 8 will drive the four discharge ports 9 to rotate together, and the rotating four discharge ports 9 will generate centrifugal force, so that the rat repellent, polyisocyanate, polyether polyol and foaming agent ejected from the four discharge ports 9 will be thrown onto the inner wall of the cavity, and the rat repellent, polyisocyanate, polyether polyol and foaming agent will be splashed when they contact the inner wall during the throwing process. The splashing will make the rat repellent, polyisocyanate, polyether polyol and foaming agent mixed more evenly, and at the same time, the rat repellent, polyisocyanate, polyether polyol and foaming agent are more likely to stick to the inner wall of the cavity, so that holes are not easily generated during the foaming process, and it is also helpful for the generated polyurethane foam to stick the lower cover 5 to the upper cover 7, so as to obtain a process in which the rat repellent, polyisocyanate, polyether polyol and foaming agent are evenly spread on the inner wall of the cavity.

[0050] refer to Figures 1 to 8 According to the figure, the process of adding rodent repellent, polyisocyanate, polyether polyol and foaming agent into the syringe 2 can be obtained:

[0051] The base frame 1 of the present invention is fixedly connected with a charging barrel A10 and a charging barrel B11, and the lower ends of the charging barrels A10 and B11 are fixedly connected with a feeding pipe 12. The charging barrel A10 is provided with a rodent repellent, polyisocyanate and polyether polyol, and the charging barrel B11 is provided with a foaming agent. The charging barrel A10 and the charging barrel B11 are used to isolate the foaming agent from the polyisocyanate and polyether polyol, so that no foaming phenomenon occurs. Then, when the rubber column 3 slides to the rear end in the injection barrel 2, since the lower ends of the charging barrels A10 and B11 are both arranged to have bottom surfaces inclined toward their respective feeding pipes 12, the rodent repellent, polyisocyanate and polyether polyol originally located in the charging barrel A10 are removed due to gravity. The polyol will enter the injection barrel 2 through the feeding pipe 12 at the bottom thereof. Similarly, the foaming agent located in the loading barrel B11 will also enter the injection barrel 2 through the feeding pipe 12 at the bottom thereof under its own gravity. At this time, the foaming agent entering the injection barrel 2 has not been fully mixed with the polyisocyanate and polyether polyol, and the reaction time will be prolonged. Later, when the rubber column 3 moves to the front end, the rubber column 3 will push the foaming agent, rat repellent, polyisocyanate and polyether polyol out from the four discharge ports 9 opened on the rotating bin 8, and then the foaming agent is fully contacted with the polyisocyanate and polyether polyol through sputtering to produce foaming, so as to obtain the effect of adding rat repellent, polyisocyanate, polyether polyol and foaming agent into the injection barrel 2.

[0052] refer to Figures 1 to 8 According to the figure, the process of fully stirring the rodent repellent into the polyisocyanate and polyether polyol can be obtained:

[0053] The upper part of the loading barrel A10 described in the present invention is rotatably connected with a stirring rod 13, and a plurality of stirring blocks 14 are fixedly connected to the stirring rod 13. After adding the rat repellent, polyisocyanate and polyether polyol into the loading barrel A10, the operator can rotate the stirring rod 13, so that the stirring rod 13 will drive the plurality of stirring blocks 14 fixedly connected around it to rotate together. The rotation of the plurality of stirring blocks 14 will stir the rat repellent, polyisocyanate and polyether polyol in the loading barrel A10, so that the rat repellent is evenly distributed in the polyisocyanate and polyether polyol. In this way, each polyurethane foam composite board produced will evenly carry the rat repellent, thereby preventing the polyurethane foam composite board lacking the rat repellent from being processed due to uneven distribution of the rat repellent, thereby obtaining the effect of fully stirring the rat repellent into the polyisocyanate and polyether polyol.

[0054] refer to Figures 1 to 9 According to the figure, the process of making the bearing plate 4 slide up and down can be obtained:

[0055] The lower part of the carrier plate 4 of the present invention is slidably connected to a top plate 15, four springs A16 are fixedly connected between the carrier plate 4 and the top plate 15, four rings 17 are fixedly connected to the top plate 15, and the lower end of the top plate 15 is fixedly connected to a cylinder 18, and the lower end of the cylinder 18 is fixedly connected to the bottom frame 1. The cylinder 18 is started to extend its cylinder rod, so that the cylinder rod will push the top plate 15 to slide upward on the bottom frame 1. Since four springs A16 are fixedly connected between the top plate 15 and the carrier plate 4, the top plate 15 will drive the carrier plate 4 to move upward together through the elastic force of the four springs A16, so that the carrier plate 4 can support When a new polyurethane foam sheet needs to be processed, the lower cover 5 and the upper cover 7 must first be slid out from the front end of the carrier plate 4, and then the cylinder 18 is started to retract its cylinder rod, so that the cylinder rod will drive the top plate 15 to move downward together, and the lower ends of the four rings 17 fixedly connected to the top plate 15 will contact the upper end of the carrier plate 4, so that the downward movement of the top plate 15 will cause the carrier plate 4 to slide downward together through the four rings 17. When the carrier plate 4 slides to the bottom, the operator places a new lower cover 5 on the carrier plate 4, and then repeats the above steps to obtain the effect of making the carrier plate 4 slide up and down.

[0056] refer to Figures 1 to 12 According to the figure, the process of preventing the foamed polyurethane foam from pushing the lower cover 5 and the upper cover 7 apart can be obtained:

[0057] A mold box 19 is provided at the front end of the upper portion of the base frame 1 described in the present invention. When the rodent repellent, polyisocyanate, polyether polyol and foaming agent are injected into the cavity formed by the lower cover 5 and the upper cover 7, the lower cover 5 and the upper cover 7 are slowly moved backwards. When moving backwards, the lower cover 5 and the upper cover 7 will slide into the mold box 19 from the front end of the mold box 19. Since the volume of the polyisocyanate and the polyether polyol will increase during foaming, the polyisocyanate and the polyether polyol will generate tension during foaming. When the lower cover 5 and the upper cover 7 are moved into the mold box 19, the inner wall of the mold box 19 will prevent the lower cover 5 from being separated from the upper cover 7. When foaming, the tension generated by the polyisocyanate and the polyether polyol will act on the mold box 19 through the lower cover 5 and the upper cover 7, allowing the mold box 19 to bear the generated tension, thereby preventing the foamed polyurethane foam from pushing the lower cover 5 and the upper cover 7 open.

[0058] refer to Figures 1 to 10 According to the figure, the process of moving the rubber column 3 back and forth can be obtained:

[0059] The upper rear end of the bottom frame 1 of the present invention is fixedly connected to two blocking frames 20, a push plate 21 is slidably connected between the two blocking frames 20, and the two blocking frames 20 are fixedly connected to the push plate 21 with a spring B22, the upper end of the top plate 15 is fixedly connected to two triangular plates 23, and the rear end of the push plate 21 is fixedly connected to a connecting frame 24, which is arranged at the rear end of the rubber column 3. When the top plate 15 drives the load-bearing plate 4 to move upward, the upper end of the load-bearing plate 4 will be blocked by the lower ends of the two blocking frames 20. , and then the cylinder rod of the cylinder 18 continues to extend, so that the cylinder rod of the cylinder 18 will drive the top plate 15 to overcome the elastic force of the four springs A16 and continue to move upward, so that the triangular plates 23 on the left and right sides of the top plate 15 will move upward together, and the two triangular plates 23 moving upward will contact the left and right sides of the push plate 21 respectively, and then the upper inclined surfaces of the two triangular plates 23 that continue to move upward will squeeze the two sides of the push plate 21, so that the push plate 21 overcomes the elastic force of the two springs B22 and moves along the upper inclined surfaces of the two triangular plates 23 The front end moves, so that the push plate 21 will slide forward on the two blocking frames 20, so that the push plate 21 will push the lower cover 5 and the upper cover 7 located on the carrier plate 4 to move forward into the mold box 19, and at the same time, the push plate 21 moving forward will drive the connecting frame 24 to move forward together, so that the connecting frame 24 will drive the rubber column 3 to slide forward in the injection barrel 2, so that the lower cover 5 and the upper cover 7 are slowly moving forward, and the rubber column 3 will also move forward to inject the rodent repellent, polyisocyanate, polyether polyol in the injection barrel 2. Alcohol and foaming agent are ejected from four discharge ports 9. When the lower cover 5 and the upper cover 7 are completely pushed into the mold box 19 by the push plate 21, the cylinder rod of the cylinder 18 is retracted, so that the top plate 15 will drive the two triangular plates 23 to move downward, so that the two triangular plates 23 will not continue to squeeze the push plate 21, and the elastic force generated by the two springs B22 will return the push plate 21 to the starting position, so that the push plate 21 will drive the rubber column 3 to move backward and return to the starting position through the connecting frame 24, so as to obtain the effect of moving the rubber column 3 back and forth.

[0060] refer to Figures 1 to 9 According to the figure, the process of quickly placing the lower cover 5 on the carrying plate 4 can be obtained:

[0061] The rear end of the carrying plate 4 described in the present invention is fixedly connected with a positioning plate 25, so when the operator places the lower cover 5 on the carrying plate 4, he only needs to push the front end of the lower cover 5 against the rear end of the positioning plate 25, so that the operator does not waste time adjusting the distance between the lower cover 5 and the push plate 21 in the horizontal direction, preventing the carrying plate 4 from touching the lower end of the push plate 21 when moving upward with the lower cover 5, thereby achieving the effect of quickly placing the lower cover 5 on the carrying plate 4.

[0062] refer to Figures 1 to 13According to the figure, the process of increasing the foaming density of the polyurethane foam composite board can be obtained:

[0063] The mold box 19 described in the present invention is provided with slots 26 at the front and rear ends, and baffles 27 are slidably connected in the two slots 26. A baffle 27 can be inserted into the slot 26 opened at the front end of the mold box 19 first. In this way, when the lower cover 5 and the upper cover 7 move into the mold box 19, the baffle 27 at the front end will prevent the lower cover 5 and the upper cover 7 from sliding out of the mold box 19. Thereafter, when the lower cover 5 and the upper cover 7 are all moved into the mold box 19, the operator can take another baffle 27 and insert it into the slot 26 at the rear end. In this way, the mold box 19 and the front and rear baffles 27 will wrap the lower cover 5 and the upper cover 7, and the polyurethane foam in the cavity can only be foamed in the cavity formed by the lower cover 5 and the upper cover 7, and no polyurethane foam will be missed. In this way, the density of the foamed polyurethane foam in the cavity will be greater, and the generated polyurethane foam will also be stronger, thereby obtaining the effect of increasing the foaming density of the polyurethane foam composite board.

[0064] refer to Figures 1 to 13 According to the figure, the process of quickly positioning the mold box 19 at the rear end of the lower cover 5 and the upper cover 7 can be obtained:

[0065] The front end of the upper part of the base frame 1 of the present invention is provided with four positioning grooves 28, and each two of the positioning grooves 28 are slidably connected with a plug plate 29. The plug plates 29 in the two positioning grooves 28 are first pulled out, and then the mold box 19 is placed on the front end of the upper part of the base frame 1. At this time, the baffle 27 has been inserted into the notch 26 opened at the front end of the mold box 19. After the mold box 19 is placed on the front end of the upper part of the base frame 1, the operator inserts the two plug plates 29 into the two positioning grooves 28 respectively, so that the two plug plates 29 and the base frame 1 will block the front end baffle 27 from moving forward and backward, and the mold box 19 is relatively stationary on the base frame 1 through the baffle 27, so that the mold box 19 can The mold box 19 can just be located at the rear end of the supporting plate 4. At the same time, when the lower cover 5 and the upper cover 7 are pushed from the supporting plate 4 into the mold box 19 by the push plate 21, the bottom surface of the lower cover 5 will generate friction with the bottom end of the inner wall of the mold box 19. The two plug plates 29 can block the mold box 19 and overcome the friction to keep it still relative to the base frame 1. When the mold box 19 with the lower cover 5 and the upper cover 7 is removed, the two plug plates 29 are pulled out first, and then the mold box 19 is taken out from the front end of the base frame 1. This reduces the time required for the operator to adjust the mold box 19 to a suitable position at the horizontal direction from the supporting plate 4, thereby achieving the effect of quickly positioning the mold box 19 at the rear end of the lower cover 5 and the upper cover 7.

[0066] The polyurethane foam composite board prepared by the polyurethane foam composite board preparation method is characterized in that the polyurethane foam composite board comprises the following raw materials in weight percentage ratio: 25% iron or aluminum, 30% polyisocyanate, 30% polyether polyol, 6% hydrofluoric acid and the remainder rodent repellent.

Claims

1. A method for preparing a polyurethane foam composite board, characterized in that: The method comprises the following steps: S1. Pressing two metal plates into the shapes of a lower cover (5) and an upper cover (7) respectively; S2. Clean the surfaces of the two metal plates; S3, placing the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the injection device; S4, combining two pressed metal plates in an injection device to form a cavity; S5, injecting the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the cavity using an injection device; S6, moving the two metal plates covered with the rodent repellent, polyisocyanate, polyether polyol and foaming agent into the mold using an injection device; S7, keeping the mold still and waiting for the polyisocyanate and polyether polyol in the cavity to completely react with the foaming agent to foam and solidify; S8, demoulding, taking out the two metal plates in the mold to obtain a polyurethane foam composite board; The injection device comprises a base frame (1) and an injection barrel (2) A fixedly connected to the base frame (1), a rubber column (3) being slidably connected inside the injection barrel (2), a bearing plate (4) being slidably connected to the base frame (1), a lower cover (5) being arranged on the bearing plate (4), two curved edges (6) being arranged on the upper part of the lower cover (5), an upper cover (7) being slidably connected to the upper end of the lower cover (5), a rotating bin (8) being rotatably connected to the front end of the injection barrel (2), and four discharge ports (9) being provided on the rotating bin (8); The base frame (1) is fixedly connected to a charging barrel A (10) and a charging barrel B (11), the lower ends of the charging barrels A (10) and B (11) are fixedly connected to a feeding pipe (12), the charging barrel A (10) contains rat repellent, polyisocyanate and polyether polyol, the charging barrel B (11) contains a foaming agent, the upper part of the charging barrel A (10) is rotatably connected to a stirring rod (13), and the stirring rod (13) is fixedly connected to a plurality of stirring blocks (14); A top plate (15) is slidably connected inside the bearing plate (4), and four springs A (16) are fixedly connected between the bearing plate (4) and the top plate (15); four rings (17) are fixedly connected to the top plate (15); a cylinder (18) is fixedly connected to the lower end of the top plate (15), and the lower end of the cylinder (18) is fixedly connected to the bottom frame (1); a mold box (19) is provided at the front end of the upper part of the bottom frame (1); two blocking frames (20) are fixedly connected to the rear end of the upper part of the bottom frame (1); a push plate (21) is slidably connected between the two blocking frames (20); springs B (22) are fixedly connected between the two blocking frames (20) and the push plate (21); a triangular plate (23) is fixedly connected to the left and right ends of the upper part of the top plate (15); a connecting frame (24) is fixedly connected to the rear end of the push plate (21); the connecting frame (24) is provided at the rear end of the rubber column (3); A positioning plate (25) is fixedly connected to the rear end of the carrier plate (4), notches (26) are provided at both the front and rear ends of the mold box (19), baffles (27) are slidably connected to the two notches (26), and four positioning grooves (28) are provided at the front end of the upper part of the base frame (1), and a plug plate (29) is slidably connected to every two of the positioning grooves (28).

2. The method for preparing a polyurethane foam composite board according to claim 1, characterized in that: The material of the metal plate in step S1 is iron or aluminum.

3. The method for preparing a polyurethane foam composite board according to claim 1, characterized in that: In step S3, the rodent repellent is peppermint oil or anise oil, and the foaming agent is hydrofluoric acid.

4. The method for preparing a polyurethane foam composite board according to claim 1, characterized in that: The injection time in step S5 is 60-80 seconds, and the temperature of the rodent repellent, polyisocyanate, polyether polyol and foaming agent is 20-30° C. during injection.

5. The method for preparing a polyurethane foam composite board according to claim 1, characterized in that: The waiting time in step S7 is 22-27 hours.

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