Automatic feeding equipment for polyurethane prepolymerization reaction and preparation process

Abstract

The invention discloses automatic feeding equipment for a polyurethane prepolymerization reaction and a preparation process, and belongs to the field of polyurethane preparation. Comprising a reaction kettle, a feeding shell is mounted at the top of the reaction kettle, and a solution cavity is formed in the feeding shell; a driving motor is mounted at the top of the reaction kettle; a heat conduction valve plate is mounted in the shell of the reaction kettle; a sampling tube is arranged at the bottom of the reaction kettle, a blanking detection opening is formed in the bottom of the sampling tube, guide strips which are symmetrically distributed are mounted at the bottom of the blanking detection opening, and the guide strips and the axis of the sampling tube are arranged in the same direction; a sampling box is mounted on the guide strip, a closed elastic piece is mounted between the guide strip and the reaction kettle, and a steering plate is mounted at the connecting position of the sampling tube and the reaction kettle; when the sampling box is installed on the guide strip, the sampling box is suitable for extruding the closing elastic piece which is suitable for abutting against the steering plate. During sampling, the sampling box is installed, the internal feeding effect of the sampling pipe is synchronously achieved, sampling is convenient and fast, and pipeline residue waste is reduced.

Description

Technical Field

[0001] The invention belongs to the field of polyurethane preparation, and relates to automatic material feeding equipment for polyurethane prepolymerization reaction and a preparation process. Background Art

[0002] The prepolymer can be produced by the nucleophilic addition reaction of the dehydrated polyol and the excess diisocyanate. In general, although the reaction between diisocyanate and polyol is an exothermic reaction, the initial reaction is slow and needs to be heated to provide a certain amount of starting energy to the system. When the reaction is carried out in large quantities, the reaction is intense and the heat release is intensified. At this time, the equipment needs to remove a large amount of reaction heat in time to avoid unnecessary side reactions. The existing equipment cannot meet the needs of uniform cooling; during the reaction of the dehydrated polyol and diisocyanate, diisocyanate needs to be added continuously in small doses to ensure the reaction. The existing equipment for adding diisocyanate has poor accuracy; the volatilization of diisocyanate is irritating to a certain extent, which endangers the safety of workers.

[0003] There are prepolymerization reaction devices in the prior art, such as 201810639298.9, a polyurethane elastomer prepolymer continuous synthesis device, and the improvement direction is safety and accurate discharge. However, for the prepolymerization reaction, since the substances are not directly mixed and stirred under certain conditions, it is considered complete. The prepolymerization reaction is a continuous reaction, and the prepolymerization reaction product needs to be detected accordingly. The product raw material polyol is a mixed substance that can include a variety of alcohols, and the reaction products are not the same, so timely sampling structure is required.

[0004] In summary, an automatic feeding device and a preparation process for a polyurethane prepolymerization reaction are proposed in the present invention. Summary of the invention

[0005] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention discloses that the basic concept of the technical solution adopted by the present invention to solve the above technical problems is:

[0006] A polyurethane prepolymerization reaction automatic feeding device comprises a reactor, a feeding shell is installed on the top of the reactor, a solution cavity is arranged in the feeding shell, and the solution cavity is suitable for storing diisocyanate; a quantitative plate is arranged on the top of the solution cavity, and a pressure plate is installed on the bottom; the quantitative plate and the pressure plate are adapted to each other;

[0007] The reactor is provided with a reaction chamber, a stirring rod is installed in the reaction chamber, and the reaction chamber is suitable for filling polyol; a driving motor is installed on the top of the reactor, the output end of the driving motor is arranged downward, the driving motor is suitable for driving the stirring rod to rotate, and the stirring rod is provided with stirring blades;

[0008] A heat-conducting valve plate is installed in the shell of the reactor, and the heat-conducting valve plate is suitable for heating or cooling the reactor;

[0009] A sampling tube is arranged at the bottom of the reactor, a material discharge detection port is arranged at the bottom of the sampling tube, symmetrically distributed guide strips are installed at the bottom of the material discharge detection port, and the guide strips are arranged in the same direction as the axis of the sampling tube; a sampling box is installed on the guide strip, a closed elastic part is installed between the guide strip and the reactor, and a steering plate is installed at the connection position between the sampling tube and the reactor; when the sampling box is installed on the guide strip, it is suitable for squeezing the closed elastic part, and the closed elastic part is suitable for abutting the steering plate.

[0010] In a further technical solution, one side of the loading shell is connected to a feeding pipe, the bottom side is connected to a sampling pipe, and a discharge pipe is provided at the bottom;

[0011] A sealing plate is installed on the top of the feeding shell, and the sealing plate is detachably connected to the feeding shell; a vertical column and a positioning rod are installed on the top of the quantitative plate, respectively, and the vertical column is located in the middle of the quantitative plate and extends to the outer end of the sealing plate;

[0012] The positioning rod is a threaded rod, a threaded hole is provided on the cover plate, a connecting blind hole is provided on the top of the quantitative plate, and the positioning rod extends downward through the cover plate and is threadedly connected to the connecting blind hole.

[0013] In a further technical solution, the front and rear sides of the loading shell are glass plates, and scale lines are marked on the glass plates.

[0014] In a further technical solution, a driving member is installed at the bottom of the feeding shell, and the output end of the driving member extends to the inside of the feeding shell and is connected to the pressure plate;

[0015] A sealing ring edge is arranged between the pressure plate and the quantitative plate.

[0016] In a further technical solution, the closing elastic member includes a moving plate 1 and a position plate, the moving plate 1 is a bent plate, and the position plate is detachably connected to the outer wall of the reactor;

[0017] A guide column is provided at the bottom of the position plate, and a guide hole matching the guide column is opened at the bottom of the movable plate;

[0018] A return spring is sleeved on the guide column, one end of the return spring is fixedly connected to the position plate, and the other end is fixedly connected to the moving plate;

[0019] A baffle plate is arranged on one side of the movable plate facing away from the reaction kettle, and the baffle plate is suitable for shielding the material discharge detection port.

[0020] In a further technical solution, a branch plate is installed on the upper part of the movable plate 1, and an opening column is arranged on the branch plate, and the opening column is located inside the sampling tube; the opening column is suitable for abutting against a steering plate, and the top of the steering plate is hinged to the inner wall of the reaction chamber of the reactor;

[0021] The material discharge detection port is long and strip-shaped and distributed along the axial direction of the sampling tube; the distance between the opening column and the steering plate at the initial position should be smaller than the length of the material discharge detection port to avoid the material discharge detection port not being able to contact the steering plate when reaching the limit position.

[0022] A groove opening is formed on the branch plate, and a diameter of the groove opening is smaller than an inner diameter of the sampling tube.

[0023] In a further technical solution, the guide column is provided with a connecting notch, and the guide column is provided with two groups;

[0024] Position holes are provided on both sides of the bottom of the sampling box, and snap-fitting parts are installed in the position holes. The snap-fitting parts are suitable for snapping into the connection slots.

[0025] In a further technical solution, the clamping member includes a front protrusion, a limit spring, a telescopic column and an outer cap body, the connecting notch is provided with a front area and an outer cap area, the front area is connected with the outer cap area, and a built-in ring is provided;

[0026] The end of the front protrusion extends out of the connection notch and is provided with a limit plate; the limit plate is installed and limited in the front area;

[0027] One end of the telescopic column is fixedly connected to the limit plate, the other end of the telescopic column is fixedly connected to the outer cap body, and the telescopic column passes through the built-in ring; the diameters of the limit plate, the outer cap body and the limit spring are all larger than the inner diameter of the built-in ring.

[0028] A preparation process of automatic feeding equipment for polyurethane prepolymerization reaction, comprising the following steps:

[0029] Step 1, introducing the polyol from the dehydration port into the reaction kettle, and precalculating the required molar ratio of the polyol and the diisocyanate;

[0030] Step 2, the heat transfer valve plate is connected to an external controller to increase the temperature to 78-95°C;

[0031] Step 3, open the feed pipe, and install two sets of electromagnetic switch valves on both sides of the feeding shell, namely valve body 1 and valve body 2. The valve body 1 is installed on the feed pipe, and the valve body 2 is installed between the feeding shell and the reaction chamber;

[0032] A pressure sensor is installed in the middle of the quantitative plate, and the pressure sensor is connected to the controller and displayed;

[0033] Step 4, adjusting the vertical column by removing the positioning rod; adjusting the height position of the quantitative plate in the solution chamber to determine the volume of the solution chamber;

[0034] Step 5, open valve body 1 in step 3, close valve body 2, and fill diisocyanate;

[0035] When the pressure sensor reaches the specified pressure, close valve body 1, open valve body 2, and fill diisocyanate into the reaction chamber;

[0036] The driving motor works to drive the stirring rod and stirring blades to rotate and stir;

[0037] Step 6: insert the sampling box into the guide bar and the guide column, abut against the movable plate 1, open the material unloading detection port, until the front protrusion is engaged with the connection notch, and the sampling box stays on the guide column;

[0038] Synchronously, the branch plate on the moving plate moves to the opening column to abut against the turning plate, and the reaction chamber is connected with the sampling tube. The reactant can enter the sampling tube and flow along the sampling tube to the material discharge detection port for sampling and collection;

[0039] Then, the two sets of outer cap bodies are pulled oppositely to make the front protrusions disengage from the connection notches, and the sampling box is moved in the opposite direction until the sampling box is disengaged from the moving plate.

[0040] Step 7, after sampling and testing to achieve the expected prepolymer product, adjust the temperature of the heat transfer valve plate, gradually cool it down to 50° C., and add an inhibitor to terminate the prepolymerization reaction.

[0041] Beneficial Effects

[0042] In the present invention, a space capable of intercepting a fixed volume is provided on the feeding shell to ensure the volume of the diisocyanate filled, which is stirred by the stirring blade of the reactor and adjusted by the heat transfer valve plate; the closed elastic member at the bottom of the sampling tube is used to block the material and move the steering plate to feed the material, so that the steering plate is opened to feed the material while the unloading detection port is opened, thereby avoiding excessive waste. The position of the sampling box is positioned by the clamping member provided at the bottom so that it is fixed on the guide column.

[0043] The present invention sets valve body 1, valve body 2 and pressure sensor to limit the volume of valve body 1, valve body 2 and solution cavity after closing. After the pressure change reaches the set value after the diisocyanate is introduced, the controller controls the valve body to open and close. The volume is adjusted by adjusting the position of the quantitative plate in the solution cavity.

[0044] The present invention controls the temperature in the reaction chamber by arranging a heat-conducting valve plate. A temperature detection device is installed in the reactor to detect the temperature. The heat-conducting valve plate is connected to an external cold source or heat source to control the temperature.

[0045] The present invention installs an opening column inside the sampling tube, installs a movable plate 1 at the bottom, and elastically supports the movable plate 1 and the fixed plate through a reset spring, moves along the guide column, and the top of the baffle plate is closed and connected with the unloading detection port. The support plate arranged at the top is used to support the opening column, and is provided with a groove to prevent the reaction liquid from being blocked in the sampling tube. When in use, the sampling box abuts the movable plate 1 to achieve the connection between the sampling box and the unloading detection port, and the movable opening column abuts the steering plate to achieve the flow of the reaction liquid to the sampling tube to achieve sampling, and as the sampling box leaves the guide column, the steering plate closes the connection between the sampling tube and the reaction chamber to achieve the closure of the sampling tube, so that too much reaction liquid will not be sampled and detected. After closing the steering plate, the reaction liquid remaining in the sampling tube is collected, and the sampling box is separated, and no waste is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 It is a schematic diagram of the automatic feeding device of the present invention;

[0048] Figure 2 A cross-sectional view of the automatic feeding device of the present invention;

[0049] Figure 3 for Figure 2 A magnified view of part A;

[0050] Figure 4 for Figure 2 A magnified view of part B;

[0051] Figure 5 A cross-sectional view of an additional sampling box for the automatic feeding device of the present invention;

[0052] Figure 6 A bottom view of the sampling tube of the present invention;

[0053] Figure 7 It is a structural diagram of the closing elastic member of the present invention;

[0054] Figure 8 It is a schematic diagram of a sampling box of the present invention;

[0055] Fig. 9 It is a cross-sectional view of the clamping member of the present invention.

[0056] In the figure: 1, reactor; 2, feeding shell; 3, driving motor; 4, heat transfer valve plate; 5, sampling tube; 6, sampling box; 7, closing elastic part; 8, feeding pipe; 9, clamping part;

[0057] 11. Stirring rod; 12. Steering plate;

[0058] 21. quantitative plate; 22. pressure plate; 23. cover plate; 24. vertical column; 25. positioning rod; 27. driving member;

[0059] 51. Material unloading detection port; 52. Guide strip;

[0060] 61. front area; 62. outer cap area; 63. built-in ring;

[0061] 71. Moving plate 1; 72. Position plate; 73. Guide column; 74. Return spring; 75. Stop plate; 76. Support plate; 77. Opening column; 78. Groove opening; 79. Connecting notch;

[0062] 81, valve body 1;

[0063] 91. front protrusion; 92. limit spring; 93. telescopic column; 94. outer cap body; 95. limit plate;

[0064] 10. Valve body 2. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0066] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0067] Example 1

[0068] like Figures 1 to 7 As shown, an embodiment of the present invention is an automatic feeding device for polyurethane prepolymerization reaction, comprising a reactor 1, a feeding shell 2 is installed on the top of the reactor 1, a solution cavity is arranged in the feeding shell 2, and the solution cavity is suitable for storing diisocyanate; a quantitative plate 21 is arranged on the top of the solution cavity, and a pressure plate 22 is installed on the bottom; the quantitative plate 21 and the pressure plate 22 are adapted to each other;

[0069] A reaction chamber is provided in the reactor 1, and a stirring rod 11 is installed in the reaction chamber, and the reaction chamber is suitable for filling polyol; a driving motor 3 is installed on the top of the reactor 1, and the output end of the driving motor 3 is downwardly arranged, and the driving motor 3 is suitable for driving the stirring rod 11 to rotate, and a stirring blade is arranged on the rod body of the stirring rod 11;

[0070] A heat transfer valve plate 4 is installed in the shell of the reactor 1. The heat transfer valve plate 4 is suitable for heating or cooling the reactor 1. Figure 1 The middle pipe opening in the reactor is connected to an external cold source or heat source for heat exchange, thereby changing the temperature in the reactor.

[0071] A sampling tube 5 is arranged at the bottom of the reactor 1, a material discharge detection port 51 is arranged at the bottom of the sampling tube 5, symmetrically distributed guide strips 52 are installed at the bottom of the material discharge detection port 51, and the guide strips 52 are arranged in the same direction as the axis of the sampling tube 5; a sampling box 6 is installed on the guide strip 52, a closing elastic member 7 is installed between the guide strip 52 and the reactor 1, and a steering plate 12 is installed at the connection position between the sampling tube 5 and the reactor 1; when the sampling box 6 is installed on the guide strip 52, it is suitable for squeezing the closing elastic member 7, and the closing elastic member 7 is suitable for abutting the steering plate 12.

[0072] One side of the loading shell 2 is connected to a feeding pipe 8, the bottom side is connected to a sampling tube 5, and a discharge pipe is arranged at the bottom; a covering plate 23 is installed on the top of the loading shell 2, and the covering plate 23 is detachably connected to the loading shell 2; a vertical column 24 and a positioning rod 25 are respectively installed on the top of the quantitative plate 21, and the vertical column 24 is located in the middle of the quantitative plate 21 and extends to the outer end of the covering plate 23; the positioning rod 25 is a threaded rod, a threaded hole is opened on the covering plate 23, and a connecting blind hole is arranged on the top of the quantitative plate 21, and the positioning rod 25 extends downward through the covering plate 23 and is threadedly connected to the connecting blind hole.

[0073] The front and rear sides of the loading housing 2 are glass plates, and scale lines are marked on the glass plates. Figure 1 As shown, the glass plate is easy to observe and the quantitative plate is convenient to adjust. A driving member 27 is installed at the bottom of the feeding shell 2. The output end of the driving member 27 extends to the inside of the feeding shell 2 and is connected to the pressure plate 22. A sealing ring is provided between the pressure plate 22 and the quantitative plate 21 to reduce the risk of leakage.

[0074] like Figure 7 As shown, the closing elastic member 7 includes a moving plate 71 and a position plate 72, wherein the moving plate 71 is a bent plate, and the position plate 72 is detachably connected to the outer wall of the reactor 1; a guide column 73 is provided at the bottom of the position plate 72, and a guide hole adapted to the guide column 73 is provided at the bottom of the moving plate 71; a reset spring 74 is sleeved on the guide column 73, and one end of the reset spring 74 is fixedly connected to the position plate 72, and the other end is fixedly connected to the moving plate 71; a baffle plate 75 is provided on the side of the moving plate 71 facing away from the reactor 1, and the baffle plate is suitable for shielding the material unloading detection port 51. A support plate 76 is installed on the upper part of the moving plate 71, and an opening column 77 is provided on the support plate 76, and the opening column 77 is located inside the sampling tube 5; the opening column 77 is suitable for abutting against the steering plate 12, and the top of the steering plate 12 is hinged to the inner wall of the reaction chamber of the reactor 1;

[0075] A groove opening 78 is formed on the branch plate 76 , and the diameter of the groove opening 78 is smaller than the inner diameter of the sampling tube 5 .

[0076] The guide column 73 is provided with a connecting notch 79, and the guide column 73 is provided with two groups; the bottom sides of the sampling box 6 are provided with position holes, and the position holes are provided with a clamping piece 9, and the clamping piece 9 is suitable for clamping at the connecting notch 79. The present invention installs an opening column inside the sampling tube, and a movable plate 1 is installed at the bottom. The movable plate 1 and the fixed plate are elastically supported by a reset spring, and move along the guide column, and the top of the baffle plate is closed and connected with the unloading detection port. The support plate arranged at the top is used to support the opening column, and is provided with a groove to prevent the reaction liquid from being blocked in the sampling tube. When in use, the sampling box abuts against the movable plate 1 to realize the connection between the sampling box and the unloading detection port, and the movable opening column abuts against the steering plate to realize the flow of the reaction liquid to the sampling tube, and sampling is realized. As the sampling box leaves the guide column, the steering plate closes the connection between the sampling tube and the reaction chamber to realize the closure of the sampling tube.

[0077] Example 2

[0078] like Figure 8 and Fig. 9 As shown, it is another embodiment of the present invention. On the basis of Example 1, the clamping member 9 includes a front protrusion 91, a limit spring 92, a telescopic column 93 and an outer cap body 94, and the connecting notch 79 is provided with a front area 61 and an outer cap area 62, the front area 61 is connected to the outer cap area 62, and a built-in ring 63 is provided;

[0079] The end of the front protrusion 91 extends out of the connection slot 79 and is provided with a limit plate 95; the limit plate 95 is installed and limited in the front area 61;

[0080] One end of the telescopic column 93 is fixedly connected to the limit plate 95 , and the other end of the telescopic column 93 is fixedly connected to the outer cap body 94 , and the telescopic column 93 passes through the built-in ring opening 63 ; the diameters of the limit plate 95 , the outer cap body 94 and the limit spring 92 are all larger than the inner diameter of the built-in ring opening 63 .

[0081] A preparation process of automatic feeding equipment for polyurethane prepolymerization reaction, comprising the following steps:

[0082] Step 1, introducing the polyol from the dehydration port into the reaction kettle 1, and precalculating the required molar ratio of the polyol and the diisocyanate;

[0083] Step 2, the heat transfer valve plate 4 is connected to an external controller to increase the temperature to 78-95°C;

[0084] Step 3, open the feed pipe 8, and install two sets of electromagnetic switch valves on both sides of the loading shell 2, namely valve body 1 81 and valve body 2 10. Valve body 1 81 is installed on the feed pipe 8, and valve body 2 10 is installed between the loading shell 2 and the reaction chamber;

[0085] A pressure sensor is installed in the middle of the quantitative plate 21, and the pressure sensor is connected to the controller and displayed;

[0086] Step 4, by removing the positioning rod 25, adjusting the vertical column 24 to adjust; adjusting the height position of the quantitative plate 21 in the solution chamber to determine the volume of the solution chamber;

[0087] Step 5, open the valve body 1 81 in step 3, close the valve body 2 10, and fill the diisocyanate;

[0088] until the pressure sensor reaches the specified pressure; close valve body 1 81, open valve body 2 10, and fill diisocyanate into the reaction chamber;

[0089] The driving motor 3 works to drive the stirring rod 11 and the stirring blades to rotate and stir;

[0090] Step 6, the sampling box 6 is inserted into the guide bar 52 and the guide column 73, abutting against the movable plate 1 71, and the material unloading detection port 51 is opened until the front protrusion 91 is engaged with the connection notch 79, and the sampling box 6 stays on the guide column 73;

[0091] At the same time, the branch plate 76 on the moving plate 1 71 moves to the opening column 77 to abut against the open steering plate 12, and the reaction chamber is connected with the sampling tube 5, so that the reactant can enter the sampling tube 5 and flow along the sampling tube 5 to the material discharge detection port 51 for sampling and collection;

[0092] Subsequently, the two groups of outer cap bodies 94 are pulled oppositely, driving the telescopic column 93 to reach the limit position, thereby squeezing the limit spring 92, and driving the front protrusion 91 to retract, so that the front protrusion 91 is disengaged from the connecting groove 79, and the sampling box 6 is moved in the reverse direction until the sampling box 6 is disengaged from the movable plate 71; the outer cap body is formed by a group of cylindrical caps and a group of plates fixed together, and the cylindrical caps are arranged outward.

[0093] Step 7, after sampling and testing to achieve the expected prepolymer product, adjust the temperature of the heat transfer valve plate 4, gradually cool it down to 50° C., and add an inhibitor to terminate the prepolymerization reaction.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0095] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A polyurethane prepolymerization reaction automatic feeding device, characterized in that: The invention comprises a reaction kettle (1), wherein a loading shell (2) is installed on the top of the reaction kettle (1), wherein a solution cavity is arranged in the loading shell (2), and wherein the solution cavity is suitable for storing diisocyanate; a quantitative plate (21) is arranged on the top of the solution cavity, and a pressure plate (22) is installed on the bottom; and the quantitative plate (21) and the pressure plate (22) are adapted to each other; The reactor (1) is provided with a reaction chamber, a stirring rod (11) is installed in the reaction chamber, and the reaction chamber is suitable for filling polyol; a driving motor (3) is installed on the top of the reactor (1), the output end of the driving motor (3) is arranged downward, the driving motor (3) is suitable for driving the stirring rod (11) to rotate, and a stirring blade is arranged on the rod body of the stirring rod (11); A heat-conducting valve plate (4) is installed in the shell of the reaction kettle (1), and the heat-conducting valve plate (4) is suitable for heating or cooling the inside of the reaction kettle (1); A sampling tube (5) is arranged at the bottom of the reaction kettle (1), a material discharge detection port (51) is arranged at the bottom of the sampling tube (5), and symmetrically distributed guide strips (52) are installed at the bottom of the material discharge detection port (51), and the guide strips (52) are arranged in the same direction as the axis of the sampling tube (5); a sampling box (6) is installed on the guide strip (52), a closing elastic member (7) is installed between the guide strip (52) and the reaction kettle (1), and a steering plate (12) is installed at the connection position between the sampling tube (5) and the reaction kettle (1); when the sampling box (6) is installed on the guide strip (52), it is suitable for squeezing the closing elastic member (7), and the closing elastic member (7) is suitable for abutting against the steering plate (12).

2. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 1, characterized in that: One side of the loading shell (2) is connected to a feeding pipe (8), the bottom side is connected to a sampling pipe (5), and a discharge pipe is provided at the bottom; A cover plate (23) is installed on the top of the feeding shell (2), and the cover plate (23) is detachably connected to the feeding shell (2); a vertical column (24) and a positioning rod (25) are installed on the top of the quantitative plate (21), respectively, and the vertical column (24) is located in the middle of the quantitative plate (21) and extends to the outer end of the cover plate (23); The positioning rod (25) is a threaded rod, a threaded hole is provided on the cover plate (23), a connecting blind hole is provided on the top of the quantitative plate (21), and the positioning rod (25) extends downward through the cover plate (23) and is threadedly connected to the connecting blind hole.

3. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 1, characterized in that: The front and rear sides of the loading shell (2) are glass plates, and scale lines are marked on the glass plates.

4. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 1, characterized in that: A driving member (27) is installed at the bottom of the feeding shell (2), and an output end of the driving member (27) extends to the inside of the feeding shell (2) and is connected to the pressure plate (22); A sealing ring edge is provided between the pressure plate (22) and the quantitative plate (21).

5. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 4, characterized in that: The closing elastic member (7) comprises a movable plate (71) and a position plate (72), wherein the movable plate (71) is a bent plate, and the position plate (72) is detachably connected to the outer wall of the reaction kettle (1); A guide column (73) is provided at the bottom of the position plate (72), and a guide hole matching the guide column (73) is provided at the bottom of the movable plate (71); The guide column (73) is sleeved with a return spring (74), one end of the return spring (74) is fixedly connected to the position plate (72), and the other end is fixedly connected to the moving plate (71); A baffle plate (75) is provided on the side of the movable plate 1 (71) facing away from the reaction kettle (1), and the baffle plate is suitable for shielding the material discharge detection port (51).

6. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 4, characterized in that: A support plate (76) is installed on the upper part of the movable plate 1 (71), and an opening column (77) is arranged on the support plate (76), and the opening column (77) is located inside the sampling tube (5); the opening column (77) is suitable for abutting against the steering plate (12), and the top of the steering plate (12) is hinged to the inner wall of the reaction chamber of the reactor (1); The branch plate (76) is provided with a groove opening (78), and the diameter of the groove opening (78) is smaller than the inner diameter of the sampling tube (5).

7. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 4, characterized in that: The guide column (73) is provided with a connection notch (79), and the guide column (73) is provided with two groups; Position holes are provided on both sides of the bottom of the sampling box (6), and a clamping piece (9) is installed in the position hole. The clamping piece (9) is suitable for clamping in the connection slot (79).

8. The automatic feeding equipment for polyurethane prepolymerization reaction according to claim 7, characterized in that: The clamping member (9) comprises a front protrusion (91), a limit spring (92), a telescopic column (93) and an outer cap body (94); a front area (61) and an outer cap area (62) are arranged in the position hole; the front area (61) is connected to the outer cap area (62) and is provided with a built-in ring opening (63); The end of the front protrusion (91) extends out of the connection slot (79) and is provided with a limiting plate (95); the limiting plate (95) is installed and limited in the front area (61); One end of the telescopic column (93) is fixedly connected to the limit plate (95), the other end of the telescopic column (93) is fixedly connected to the outer cap body (94), and the telescopic column (93) passes through the built-in ring opening (63); the diameters of the limit plate (95), the outer cap body (94) and the limit spring (92) are all larger than the inner diameter of the built-in ring opening (63).

9. A preparation process of automatic feeding equipment for polyurethane prepolymerization reaction, characterized in that: The automatic feeding device according to claim 7 further comprises the following steps: Step 1, introducing the polyol from the dehydration port into a reaction kettle (1), and calculating in advance the required molar ratio of the polyol and the diisocyanate; Step 2, the heat transfer valve plate (4) is connected to an external controller to increase the temperature to 78-95°C; Step 3, opening the feed pipe (8), two sets of electromagnetic switch valves are installed on both sides of the feeding shell (2), namely valve body 1 (81) and valve body 2 (10), wherein the valve body 1 (81) is installed on the feed pipe (8), and the valve body 2 (10) is installed between the feeding shell (2) and the reaction chamber; A pressure sensor is installed in the middle of the quantitative plate (21), and the pressure sensor is connected to the controller and displayed; Step 4, by removing the positioning rod (25), adjusting the vertical column (24) to adjust; adjusting the height position of the quantitative plate (21) in the solution chamber to determine the volume of the solution chamber; Step 5, open valve body 1 (81) in step 3, close valve body 2 (10), and fill diisocyanate; until the pressure sensor reaches a specified pressure; close valve body 1 (81), open valve body 2 (10), and fill diisocyanate into the reaction chamber; The driving motor (3) works to drive the stirring rod (11) and the stirring blade to rotate and stir; Step 6, the sampling box (6) is inserted into the guide bar (52) and the guide column (73), abutting against the movable plate (71), and the material unloading detection port (51) is opened until the front protrusion (91) is engaged with the connecting notch (79), and the sampling box (6) stays on the guide column (73); Synchronously, the branch plate (76) on the movable plate (71) moves to the opening column (77) to abut against the open steering plate (12), so that the reaction chamber is connected with the sampling tube (5), and the reactant enters the sampling tube (5), flows along the sampling tube (5) to the material discharge detection port (51), and is sampled and collected; Subsequently, the two sets of outer cap bodies (94) are pulled oppositely so that the front protrusion (91) is separated from the connection notch (79), and the sampling box (6) is moved in the reverse direction until the sampling box (6) is separated from the moving plate 1 (71); Step 7, after sampling and testing to achieve the expected prepolymer product, adjust the temperature of the heat transfer valve plate (4), gradually cool it down to 50° C., and add a polymerization inhibitor to terminate the prepolymerization reaction.

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