Reaction equipment for low free isocyanate polyurethane prepolymer

Abstract

The invention discloses reaction equipment of a low free isocyanate polyurethane prepolymer, and relates to the technical field of reaction equipment.The reaction equipment comprises a bottom plate, a reaction tank is arranged on one side of the upper portion of the bottom plate, fixing legs fixed to the bottom plate are arranged at the lower end of the reaction tank, and heaters are embedded in the two sides of the interior of the reaction tank; a feeding opening is formed in one side of the upper end of the reaction tank, a bottom partition plate is fixedly connected to the lower end in the reaction tank, and an inclined spraying pipe is rotationally connected to the bottom partition plate; by arranging the liquid pumping assembly, the liquid supply assembly and the driving assembly, liquid in the reaction tank can be pumped into a pumping barrel during use and then conveyed to an inclined spray pipe and a middle spray pipe to be sprayed out, and meanwhile, the inclined spray pipe rotates to continuously change the spraying direction of the inclined spray pipe, so that irregular turbulent flow is formed in the reaction tank, and the reaction effect is improved. Meanwhile, intermittent liquid spraying of the inclined spraying pipe is matched, so that the material mixing efficiency can be greatly improved, and the reaction speed is increased.

Description

Technical Field

[0001] The invention relates to the technical field of reaction equipment, in particular to a reaction equipment for low-free isocyanate polyurethane prepolymer. Background Art

[0002] Polyurethane is the only synthetic polymer material with significant application value in various fields such as plastics, rubber, foam, fiber, coating, adhesive and functional polymer. Its products have penetrated into all aspects of the national economy and have become the most diverse, widely used and fastest growing organic synthetic material among current polymer materials. Polyurethane prepolymers obtained by reacting organic diisocyanates with polyols are usually used in industry to manufacture a variety of porous and non-porous polyurethane elastomer products.

[0003] In the preparation process of low free isocyanate polyurethane prepolymer, different materials need to be added to obtain the final desired product. Reaction equipment is needed in the preparation process. However, the existing reaction equipment generally uses a stirring shaft to mix the materials when mixing the materials. For example, a polyester polyurethane adhesive processing reaction equipment proposed in the prior art CN208526403U uses a stirring blade to stir the materials to achieve a mixing reaction of the materials.

[0004] However, this stirring method has certain defects in actual work. When this method is working, the material is prone to sinking to the bottom and dead zones appear. Therefore, the mixing time needs to be extended to allow the materials to fully react with each other, and the working efficiency is low. At the same time, the existing reaction equipment generally adopts the method of setting a stirring rod or stirring plate in the reactor for stirring. In the actual working process, this type of method will occupy too much reactor space, resulting in a reduction in the capacity of the reactor. At the same time, the movement of the stirring shaft during the stirring process is relatively regular, so the material inside the reactor is also regular, and turbulence cannot be generated, resulting in low mixing efficiency, thereby reducing the reaction speed. In response to the above problems, we provide a reaction device for low free isocyanate polyurethane prepolymer to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a reaction device for low-free isocyanate polyurethane prepolymer to solve the problems of the prior art that the stirring parts occupy a large amount of space, the materials sink to the bottom and the efficiency is low.

[0006] To achieve the above object, the present invention provides the following technical solutions: A reaction device for low-free isocyanate polyurethane prepolymer, comprising a bottom plate, a reaction tank is arranged on one side above the bottom plate, a fixing leg is arranged at the lower end of the reaction tank to fix the bottom plate, and heaters are embedded on both sides of the reaction tank; A feeding port is provided on one side of the upper end of the reaction tank, a bottom baffle is fixedly connected to the lower end of the reaction tank, an oblique nozzle is rotatably connected to the bottom baffle, the oblique nozzle is distributed in a ring shape, an intermediate nozzle is rotatably connected to the middle of the bottom baffle, horizontal nozzles are provided on both sides of the upper end of the intermediate nozzle, one-way valves are provided on the oblique nozzle and the intermediate nozzle, and a driving component for driving the oblique nozzle and the intermediate nozzle to rotate is provided in the cavity below the bottom baffle; A liquid infusion assembly for conveying liquid to the middle nozzle and the oblique nozzle is also provided in the cavity below the bottom partition.

[0007] As a further solution of the present invention: the driving assembly includes an annular bearing, which is installed at the lower end of the reaction tank, and an annular internal gear is installed in the annular bearing. The lower end of the inclined nozzle is installed with a transmission gear meshing with the annular internal gear, and the lower end of the intermediate nozzle is also installed with an intermediate gear. The lower end of the reaction tank is also provided with a rotating assembly for driving the intermediate gear and the transmission gear to rotate.

[0008] As a further solution of the present invention: the rotating assembly includes a second motor, the second motor is installed in the cavity below the bottom partition through a motor frame, a motor gear is installed at the output end of the second motor, and the intermediate gear and the transmission gear are both engaged with the motor gear.

[0009] As a further solution of the present invention: the infusion assembly includes a hollow bottom ring, which is fixedly connected to the lower end surface of the reaction tank, and the upper end surface of the hollow bottom ring is provided with a plurality of fixed tubes connected to the interior of the hollow bottom ring, and the upper ends of the fixed tubes are respectively connected to the lower ends of the inclined nozzle and the middle nozzle by rotating joints, and the lower end surface of the reaction tank is installed with a liquid supply assembly for delivering liquid to the interior of the hollow bottom ring.

[0010] As a further solution of the present invention: the liquid supply component includes a suction cylinder, the suction cylinder is fixedly connected to the lower end surface of the reaction tank, a piston block is slidably connected inside the suction cylinder, a piston rod is fixedly connected to one side of the piston block, the piston rod is slidably connected to the suction cylinder, a reciprocating component for driving the piston rod to reciprocate is provided on the upper end surface of the bottom plate, both ends of the suction cylinder are provided with a suction pipe, and the suction pipe is provided with a suction component for pumping the liquid inside the reaction tank into the suction cylinder, and the two end surfaces of the suction cylinder are close to the suction pipe. A liquid outlet pipe is provided, a connecting pipe is provided on the liquid outlet pipe, the upper end of the connecting pipe is connected with the inside of the hollow bottom ring, a vertical pipe is connected to the liquid outlet pipe at one end of the suction cylinder, a delivery pipe is connected to the liquid outlet pipe at the other end of the suction cylinder, the upper end of the delivery pipe is connected with the middle of the upper end of the reaction tank, a plurality of dispersion plates are fixedly connected to the upper end surface of the reaction tank, a flushing pipe is provided at the upper end of the vertical pipe and the middle of the delivery pipe, a flat-head spray nozzle is provided at the position of the flushing pipe located inside the reaction tank, a liquid inlet check valve is provided in the liquid suction pipe, and a liquid outlet check valve is provided in the liquid outlet pipe.

[0011] As a further solution of the present invention: the reciprocating component includes a threaded rod, which is rotatably connected to a position above the base plate by a rotating seat, the end of the piston rod is fixedly connected to a driving block, and the driving block is threadedly connected to the threaded rod, and the upper end surface of the base plate is also provided with a power component for driving the threaded rod to rotate.

[0012] As a further solution of the present invention: the power assembly includes a first motor, which is installed at a position on the bottom plate away from the reaction tank, and pulleys are installed at one end of the threaded rod away from the reaction tank and the output end of the first motor, and a transmission belt is installed between the two pulleys.

[0013] As a further solution of the present invention: the liquid extraction component includes a liquid suction box, which is fixedly connected to the middle position of both sides of the reaction tank, and the port of the liquid suction box is provided with a filter net, and the end of the liquid suction tube away from the suction cylinder is connected to the liquid suction box.

[0014] As a further solution of the present invention: the vertical portion of the liquid suction pipe is connected in series with an intermediate pipe, and a static mixer is provided inside the intermediate pipe.

[0015] As a further solution of the present invention: a discharge port communicating with the interior of the reaction tank is further provided on one side of the lower end of the bottom plate, and a discharge valve is provided on the discharge port.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can, by means of the arranged liquid pumping assembly, liquid supply assembly and driving assembly, pump the liquid inside the reaction tank into the suction cylinder during use, and then transport it to the inclined nozzle and the middle nozzle and spray it out. At the same time, the inclined nozzle rotates to continuously change the spraying direction of the inclined nozzle, so that irregular turbulence is formed inside the reaction tank. At the same time, the intermittent liquid spraying of the inclined nozzle can greatly improve the mixing efficiency of the materials and the reaction speed.

[0017] 2. The present invention mixes the materials inside the reaction tank by spraying liquid through an inclined nozzle. This method does not require a stirring structure to be provided inside the reaction tank, thereby avoiding the problem of space occupation by the stirring component in the prior art.

[0018] 3. The present invention provides a horizontal nozzle, which can use the spray liquid to purge the bottom of the reaction tank during operation, thereby effectively preventing the material from settling to the bottom of the reaction tank and avoiding the occurrence of dead zones.

[0019] 4. The present invention can extract the liquid inside the reaction tank and then deliver it back through the suction cylinder and piston block during operation. When one side of the suction cylinder is absorbing liquid during operation, the cavity on the other side is discharging liquid, so that the inclined nozzle and the delivery pipe can alternately spray liquid during operation, thereby further improving the mixing efficiency and the reaction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the reaction tank in the present invention.

[0022] Figure 3 It is a schematic diagram of the local structure in the present invention.

[0023] Figure 4 It is a structural schematic diagram of the other side of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the suction cylinder in the present invention.

[0025] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the suction cylinder in the present invention.

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the intermediate tube in the present invention.

[0027] Among them: 1. bottom plate; 2. suction cylinder; 3. threaded rod; 4. first motor; 5. pulley; 6. transmission belt; 7. drive block; 8. piston rod; 9. reaction tank; 10. delivery pipe; 11. feeding port; 12. suction box; 13. vertical pipe; 14. intermediate pipe; 15. dispersion plate; 16. flat head nozzle; 17. filter screen; 18. bottom partition; 19. hollow bottom ring; 20. suction pipe; 21. connecting pipe; 22. liquid outlet pipe; 23. oblique nozzle; 24. piston block; 25. static mixer; 26. flushing pipe; 27. fixed pipe; 28. rotary joint; 29 and transmission gear; 30. intermediate gear; 31. horizontal nozzle; 32. intermediate nozzle; 33. one-way valve; 34. annular internal gear; 35. annular bearing; 36. second motor; 37. motor gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0029] See also Figure 1-Figure 7 In an embodiment of the present invention, a reaction device for a low-free isocyanate polyurethane prepolymer includes a bottom plate 1, a reaction tank 9 is provided on one side above the bottom plate 1, a fixing leg fixed to the bottom plate 1 is provided at the lower end of the reaction tank 9, and heaters are embedded on both sides of the reaction tank 9; a feeding port 11 is provided on one side of the upper end of the reaction tank 9, and a discharge port connected to the interior of the reaction tank 9 is also provided on one side of the lower end of the bottom plate 1, and a discharge valve is provided on the discharge port; when in use, the required reaction materials can be added to the interior of the reaction tank 9 through the feeding port 11, and the set discharge port can be used to discharge the materials in the reaction tank 9 after the reaction is completed, and the setting of the heater can adjust the problems inside the reaction tank 9 during operation.

[0030] A bottom baffle 18 is fixedly connected to the lower end of the reaction tank 9, and an oblique nozzle 23 is rotatably connected to the bottom baffle 18. The oblique nozzle 23 is distributed in a ring shape, and an intermediate nozzle 32 is rotatably connected to the middle of the bottom baffle 18. Horizontal nozzles 31 are provided on both sides of the upper end of the intermediate nozzle 32. Both the oblique nozzle 23 and the intermediate nozzle 32 are provided with a one-way valve 33. A driving component for driving the oblique nozzle 23 and the intermediate nozzle 32 to rotate is provided in the cavity below the bottom baffle 18; when working, the driving component drives the intermediate nozzle 32 and the oblique nozzle 23 to rotate, and the injection direction of the oblique nozzle 23 is continuously changed by the rotation of the oblique nozzle 23, so that irregular turbulence is formed inside the reaction tank 9. At the same time, the intermittent liquid spraying of the oblique nozzle 23 can greatly improve the mixing efficiency of the materials and the reaction speed.

[0031] The driving assembly includes an annular bearing 35, which is installed at the lower end of the reaction tank 9. An annular internal gear 34 is installed in the annular bearing 35. A transmission gear 29 meshing with the annular internal gear 34 is installed at the lower end of the inclined nozzle 23. An intermediate gear 30 is also installed at the lower end of the intermediate nozzle 32. A rotating assembly for driving the intermediate gear 30 and the transmission gear 29 to rotate is also provided at the lower end of the reaction tank 9; the rotating assembly includes a second motor 36, which is installed in the cavity below the bottom partition 18 through a motor frame. A motor gear 37 is installed at the output end of the second motor 36, and the intermediate gear 30 and the transmission gear 29 are both meshed with the motor gear 37; when working, the second motor 36 drives the fixed tube 27 to rotate, and the rotation of the motor gear 37 can drive the intermediate gear 30 to rotate, and the rotation of the motor gear 37 can also drive the transmission gear 29 to rotate, and the rotation of the transmission gear 29 can drive the annular internal gear 34 to rotate, and the rotation of the annular internal gear 34 can drive all the transmission gears 29 to rotate, and the rotation of the transmission gear 29 can drive the inclined nozzle 23 to rotate to achieve a change in the injection direction.

[0032] The cavity below the bottom partition 18 is also provided with an infusion assembly for conveying liquid to the middle nozzle 32 and the oblique nozzle 23; the infusion assembly includes a hollow bottom ring 19, which is fixedly connected to the lower end surface of the reaction tank 9, and the upper end surface of the hollow bottom ring 19 is provided with a plurality of fixed pipes 27 connected to the inside of the hollow bottom ring 19, and the upper ends of the fixed pipes 27 are respectively connected to the lower ends of the oblique nozzle 23 and the middle nozzle 32 by a rotary joint 28, and the lower end surface of the reaction tank 9 is installed with a liquid supply assembly for conveying liquid to the inside of the hollow bottom ring 19. During operation, liquid can be supplied to the middle nozzle 32 and the oblique nozzle 23 through the liquid supply assembly, and the setting of the rotary joint 28 can connect the oblique nozzle 23 and the middle nozzle 32 to the fixed fixed pipe 27.

[0033] The liquid supply assembly includes a suction cylinder 2, which is fixedly connected to the lower end surface of the reaction tank 9, and a piston block 24 is slidably connected inside the suction cylinder 2. A piston rod 8 is fixedly connected to one side of the piston block 24, and the piston rod 8 is slidably connected to the suction cylinder 2. A reciprocating assembly for driving the piston rod 8 to reciprocate is provided on the upper end surface of the bottom plate 1; During operation, the piston block 24 reciprocates to absorb and discharge liquid. When the piston block 24 moves toward the piston rod 8, liquid is taken in from the rodless chamber. At the same time, the piston block 24 moves toward the piston rod 8, the rod chamber is discharged to transport the liquid in the rod chamber to the delivery pipe 10, and the liquid is sprayed out from the corresponding flat-head nozzle 16 and the end of the delivery pipe 10. When the piston block 24 moves away from the piston rod 8, the rodless chamber is discharged and the corresponding rod chamber is filled with liquid. The discharged liquid from the rodless chamber is discharged into the corresponding flat-head nozzle 16 and the hollow bottom ring 19, and is sprayed out from the hollow bottom ring 19, so that during operation, the inclined nozzle 23 and the delivery pipe 10 can realize alternate spraying, thereby improving the mixing efficiency.

[0034] The reciprocating assembly includes a threaded rod 3, which is rotatably connected to a position above the base plate 1 by a rotating seat, and the end of the piston rod 8 is fixedly connected to a driving block 7, which is threadedly connected to the threaded rod 3, and the upper end surface of the base plate 1 is also provided with a power assembly for driving the threaded rod 3 to rotate; the power assembly includes a first motor 4, which is installed at a position of the base plate 1 away from the reaction tank 9, and the end of the threaded rod 3 away from the reaction tank 9 and the output end of the first motor 4 are both equipped with pulleys 5, and a transmission belt 6 is installed between the two pulleys 5; when working, the first motor 4 drives the transmission belt 6 to operate, and the rotation of the transmission belt 6 drives the threaded rod 3 to rotate, and the rotation of the threaded rod 3 drives the driving block 7 to reciprocate, and the reciprocating motion of the driving block 7 realizes the reciprocating motion of the piston rod 8, thereby driving the piston block 24 to reciprocate.

[0035] Both ends of the suction cylinder 2 are provided with a liquid suction tube 20, and the liquid suction tube 20 is provided with a liquid suction component for sucking the liquid inside the reaction tank 9 into the suction cylinder 2, and the liquid suction component includes a liquid suction box 12, and the liquid suction box 12 is respectively fixedly connected to the middle position of both sides of the reaction tank 9, and the port of the liquid suction box 12 is provided with a filter screen 17, and the end of the liquid suction tube 20 away from the suction cylinder 2 is respectively connected with the liquid suction box 12; the vertical part of the liquid suction tube 20 is connected in series with an intermediate tube 14, and a static mixer 25 is provided inside the intermediate tube 14; when sucking liquid, the liquid enters the interior of the intermediate tube 14 from the liquid suction box 12, and the filter screen 17 can filter solid physics to prevent non-liquid physics from entering the interior of the liquid suction box 12.

[0036] Both end surfaces of the suction cylinder 2 are provided with liquid outlet pipes 22 near the position of the liquid suction pipe 20, and the liquid outlet pipe 22 is provided with a connecting pipe 21, and the upper end of the connecting pipe 21 is connected to the inside of the hollow bottom ring 19, and the liquid outlet pipe 22 at one end of the suction cylinder 2 is connected to the vertical pipe 13, and the liquid outlet pipe 22 at the other end of the suction cylinder 2 is connected to the delivery pipe 10, and the upper end of the delivery pipe 10 is connected to the middle of the upper end of the reaction tank 9, and the upper end surface of the reaction tank 9 is fixedly connected to a plurality of dispersion plates 15, and the upper end of the vertical pipe 13 and the middle of the delivery pipe 10 are connected. A flushing pipe 26 is provided in between, and a flat-head nozzle 16 is provided at a position inside the reaction tank 9. A liquid inlet check valve 38 is provided in the liquid suction pipe 20, and a liquid outlet check valve 39 is provided in the liquid outlet pipe 21; the flat-head nozzle 16 can intermittently spray liquid with the movement of the piston block 24 to achieve the purge of the surface of the filter screen 17 to avoid clogging of the attachments on the filter screen 17, and the static mixer 25 can statically mix the incoming liquid to promote the mutual reaction between the liquids and improve the mixing efficiency.

[0037] The working principle of the present invention is: when working, the required materials are put into the reaction tank 9, and then the reciprocating assembly is started to drive the piston rod 8 to reciprocate, and the piston rod 8 drives the piston block 24 to reciprocate. The reciprocating motion of the piston block 24 can suck the liquid inside the reaction tank 9 and then spray it out from the inclined nozzle 23 and the delivery pipe 10. The liquid sprayed from the delivery pipe 10 will fall on the dispersion plate 15 and disperse into the inside of the reaction tank 9. The liquid sprayed from the inclined nozzle 23 will be sprayed in multiple directions under the rotation of the inclined nozzle 23, and then turbulence will be formed at the bottom of the reaction tank 9, so that the materials inside the reaction tank 9 can be quickly mixed and reacted. At the same time, the horizontal nozzle 31 can purge the bottom of the reaction tank 9 to prevent the material from settling to the bottom of the reaction tank 9 to form a dead zone. After the mixing reaction is completed, it can be discharged through the discharge port and sent to the next process.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Although this specification is described in accordance with the implementation modes, not every implementation mode includes only one technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A reaction device for a low-free isocyanate polyurethane prepolymer, comprising a bottom plate (1), a reaction tank (9) being arranged on one side above the bottom plate (1), and a fixing leg being arranged at the lower end of the reaction tank (9) for fixing to the bottom plate (1), characterized in that: Heaters are embedded on both sides of the reaction tank (9); A feeding port (11) is provided at one side of the upper end of the reaction tank (9); a bottom baffle (18) is fixedly connected to the lower end of the reaction tank (9); an inclined nozzle (23) is rotatably connected to the bottom baffle (18); the inclined nozzle (23) is distributed in a ring shape; an intermediate nozzle (32) is rotatably connected to the middle of the bottom baffle (18); horizontal nozzles (31) are provided on both sides of the upper end of the intermediate nozzle (32); a one-way valve (33) is provided on the inclined nozzle (23) and the intermediate nozzle (32); and a driving component for driving the inclined nozzle (23) and the intermediate nozzle (32) to rotate is provided in the cavity below the bottom baffle (18); The cavity below the bottom partition (18) is also provided with an infusion assembly for conveying liquid to the interior of the middle nozzle (32) and the oblique nozzle (23).

2. The reaction equipment of a low-free isocyanate polyurethane prepolymer according to claim 1, characterized in that: The driving assembly comprises an annular bearing (35), the annular bearing (35) being mounted at a lower end of the interior of the reaction tank (9), an annular internal gear (34) being mounted in the annular bearing (35), a transmission gear (29) meshing with the annular internal gear (34) being mounted at the lower end of each of the oblique nozzles (23), an intermediate gear (30) being mounted at the lower end of the intermediate nozzle (32), and a rotating assembly for driving the intermediate gear (30) and the transmission gear (29) to rotate being further disposed at the lower end of the reaction tank (9).

3. The reaction device of a low-free isocyanate polyurethane prepolymer according to claim 2, characterized in that: The rotating assembly comprises a second motor (36), the second motor (36) being mounted in a cavity below the bottom partition (18) via a motor frame, a motor gear (37) being mounted at an output end of the second motor (36), and the intermediate gear (30) and the transmission gear (29) both being meshed with the motor gear (37).

4. The reaction device of a low-free isocyanate polyurethane prepolymer according to claim 1, characterized in that: The infusion assembly comprises a hollow bottom ring (19), the hollow bottom ring (19) being fixedly connected to the lower end surface of the reaction tank (9), the upper end surface of the hollow bottom ring (19) being provided with a plurality of fixed pipes (27) communicating with the interior of the hollow bottom ring (19), the upper ends of the fixed pipes (27) being respectively connected to the lower ends of the oblique nozzle (23) and the middle nozzle (32) by means of a rotary joint (28), and the lower end surface of the reaction tank (9) being provided with a liquid supply assembly for delivering liquid to the interior of the hollow bottom ring (19).

5. The reaction device of a low-free isocyanate polyurethane prepolymer according to claim 4, characterized in that: The liquid supply assembly comprises a suction cylinder (2), the suction cylinder (2) being fixedly connected to the lower end surface of the reaction tank (9), a piston block (24) being slidably connected inside the suction cylinder (2), a piston rod (8) being fixedly connected to one side of the piston block (24), the piston rod (8) being slidably connected to the suction cylinder (2), a reciprocating assembly for driving the piston rod (8) to reciprocate is provided on the upper end surface of the bottom plate (1), both ends of the suction cylinder (2) are provided with a suction pipe (20), the suction pipe (20) is provided with a suction assembly for sucking liquid inside the reaction tank (9) into the suction cylinder (2), both end surfaces of the suction cylinder (2) are provided with a liquid outlet pipe (22) near the liquid outlet pipe (20), A connecting pipe (21) is connected to the interior of the hollow bottom ring (19); a liquid outlet pipe (22) at one end of the suction cylinder (2) is connected to a vertical pipe (13); a liquid outlet pipe (22) at the other end of the suction cylinder (2) is connected to a delivery pipe (10); an upper end of the delivery pipe (10) is connected to the middle of the upper end of the reaction tank (9); a plurality of dispersion plates (15) are fixedly connected to the upper end surface of the reaction tank (9); a flushing pipe (26) is provided at the upper end of the vertical pipe (13) and the middle of the delivery pipe (10); a flat-head spray nozzle (16) is provided at a position of the flushing pipe (26) located inside the reaction tank (9); a liquid inlet check valve (38) is provided in the liquid suction pipe (20); and a liquid outlet check valve (39) is provided in the liquid outlet pipe (21).

6. The reaction equipment of a low-free isocyanate polyurethane prepolymer according to claim 5, characterized in that: The reciprocating assembly comprises a threaded rod (3), the threaded rod (3) being rotatably connected to a position above the base plate (1) by means of a rotating seat, the end of the piston rod (8) being fixedly connected to a driving block (7), the driving block (7) being threadably connected to the threaded rod (3), and the upper end surface of the base plate (1) is also provided with a power assembly for driving the threaded rod (3) to rotate.

7. The reaction device of a low-free isocyanate polyurethane prepolymer according to claim 6, characterized in that: The power assembly comprises a first motor (4), the first motor (4) being mounted on a position of the base plate (1) away from the reaction tank (9), one end of the threaded rod (3) away from the reaction tank (9) and an output end of the first motor (4) being both mounted with pulleys (5), and a transmission belt (6) being mounted between the two pulleys (5).

8. The reaction equipment of a low-free isocyanate polyurethane prepolymer according to claim 5, characterized in that: The liquid extraction assembly comprises a liquid suction box (12), the liquid suction box (12) being fixedly connected to the middle positions of both sides of the reaction tank (9), a filter screen (17) being provided at the port of the liquid suction box (12), and one end of the liquid suction tube (20) away from the suction cylinder (2) being connected to the liquid suction box (12).

9. The reaction device for low-free isocyanate polyurethane prepolymer according to claim 8, characterized in that: The vertical portion of the liquid suction pipe (20) is connected in series with an intermediate pipe (14), and a static mixer (25) is provided inside the intermediate pipe (14).

10. The reaction device for low-free isocyanate polyurethane prepolymer according to claim 1, wherein a discharge port communicating with the interior of the reaction tank (9) is provided on one side of the lower end of the bottom plate (1), and a discharge valve is provided on the discharge port.

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