Vacuum reaction kettle for producing polyurethane prepolymer

Abstract

The utility model discloses a kind of polyurethane prepolymer production vacuum reaction kettle, it is related to polyurethane prepolymer production technical field, including reaction kettle, the bottom middle part of the reaction kettle is fixed with discharge pipe, the inner chamber bottom edge of the reaction kettle is fixed with temperature sensor, the bottom of the reaction kettle is uniformly fixed with support foot, the top of the reaction kettle is connected with top cover, the top middle part of the top cover is fixed with sealing ring and penetrates;The polyurethane prepolymer production vacuum reaction kettle, by the setting of stirring mechanism, by the starting of stirring motor, drive shaft rotation is led, make stirring rod stir, simultaneously by the starting of double-shaft motor, so that shaft drives stirring rod reciprocating motion up and down, and then make stirring rod one side rotation agitates, one side agitates up and down, to avoid inertia caused by long time rotation between reactants relatively stationary, so that reactant between mixing is more sufficient and uniform, improve reaction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane prepolymer production technology, specifically a vacuum reactor for polyurethane prepolymer production. Background Technology

[0002] Polyurethane is a high molecular polymer formed by the reaction of polyisocyanate and polyether or polyester polyol under certain conditions. The prepolymer of polyurethane is simply a reactive gel-like semi-finished product obtained by reacting polyisocyanate and polyol in a controlled proportion. The most commonly used polyurethane prepolymer is the NCO-terminated polyurethane prepolymer.

[0003] In current reactor processes, the stirring is usually done in a single axial direction. After a long period of stirring, the reactants tend to rotate in one direction due to inertia, which can cause them to remain relatively stationary. This can lead to uneven and insufficient mixing, which is not conducive to the normal and rapid progress of the reaction and affects production efficiency. To address this, we have proposed a vacuum reactor for the production of polyurethane prepolymers. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum reactor for the production of polyurethane prepolymer, in order to solve the problem that in the existing reactor, after long-term stirring, the reactants always rotate in one direction due to inertia, which easily leads to relative stillness between the reactants, resulting in uneven and insufficient mixing, which is not conducive to the normal and rapid progress of the reaction and affects production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum reactor for producing polyurethane prepolymer, comprising a reactor, a discharge pipe fixed at the bottom center of the reactor, a temperature sensor fixed at the bottom edge of the reactor's inner cavity, support feet evenly fixed at the bottom of the reactor, a top cover connected to the top of the reactor, a sealing ring fixed through the top center of the top cover, feed pipes symmetrically fixed at the top of the top cover, an exhaust pipe fixed at the top of the top cover, and a stirring mechanism provided on the top cover, the stirring mechanism including a rotating shaft connected inside the sealing ring, and stirring rods evenly and symmetrically fixed on the outer side of the rotating shaft.

[0006] Preferably, the stirring mechanism further includes a slide rod uniformly fixed to the top of the top cover, a slide plate sliding on the outer side of the slide rod, a connecting seat symmetrically fixed on the top of the slide plate, a stirring motor fixed at the bottom center of the slide plate, a top plate fixed at the top of the slide rod, a dual-shaft motor fixed at the top center of the top plate, a turntable fixed at the end of the output shaft of the dual-shaft motor, and a connecting rod fixed on one side of the turntable.

[0007] Preferably, the output shaft end of the stirring motor is fixedly connected to the top end of the rotating shaft, and the outer side wall of the rotating shaft is tightly fitted with the inner side wall of the sealing ring, so that the rotating shaft and the sealing ring are sealed.

[0008] Preferably, one end of the connecting rod is rotatably connected to the inside of the connecting seat, and the connecting rod is rotatably connected to the turntable through a connecting shaft, so that the connecting seat can be moved up and down by the connecting rod when the turntable rotates.

[0009] Preferably, an electromagnetic valve is provided on the outside of the discharge pipe, a spiral cavity is opened inside the reactor, an inlet pipe is fixed at the bottom of the outer wall of the reactor at the inlet of the spiral cavity, a pump is fixed at the end of the inlet pipe, a suction pipe is fixed at the inlet end of the pump, and a return pipe is fixed at the top of the outer wall of the reactor at the outlet of the spiral cavity, so as to facilitate the pumping of the heat transfer medium into the spiral cavity to control the temperature inside the reactor.

[0010] Preferably, connecting rods are uniformly and symmetrically fixed to the outer wall of the rotating shaft, and a first scraper is fixed to the end of the connecting rod. A second scraper is fixed between two adjacent first scrapers, which facilitates the cleaning and scraping of reactants inside the reactor and avoids residue.

[0011] Preferably, one side of the first scraper is arc-shaped and fits against the inner wall of the reactor, and the upper and lower sides of the second scraper are provided with inclined surfaces.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this application, the stirring mechanism is designed so that the stirring motor drives the rotating shaft to rotate, causing the stirring rod to stir. At the same time, the dual-shaft motor drives the turntable to rotate, which in turn causes the connecting rod to move the connecting seat up and down, the sliding plate to move the stirring motor up and down, and the rotating shaft to move the stirring rod up and down. This allows the stirring rod to rotate and stir at the same time, thus avoiding the inertia caused by prolonged rotation that would result in the reactants remaining relatively stationary. This makes the reactants mix more thoroughly and evenly, improving the reaction efficiency.

[0014] 2. In this application, by using a connecting rod, a first scraper, and a second scraper, the connecting rod causes the first scraper to deflect when the rotating shaft rotates, scraping the inner wall of the reactor. At the same time, when the rotating shaft moves up and down, the first scraper causes the second scraper to move up and down, scraping the inner wall of the reactor from top to bottom. This thoroughly cleans the inner wall of the reactor, avoids reactant residue, and prevents waste. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the reaction vessel of this utility model;

[0017] Figure 3 This is a schematic diagram of the stirring mechanism of this utility model;

[0018] Figure 4 This is a schematic diagram of the connecting rod installation structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the first scraper installation structure of this utility model.

[0020] Labels in the diagram: 100, Reactor; 110, Discharge pipe; 120, Spiral cavity; 130, Inlet pipe; 140, Pump; 141, Suction pipe; 150, Return pipe; 160, Temperature sensor; 200, Support foot; 300, Top cover; 310, Sealing ring; 400, Feed pipe; 500, Extraction pipe; 600, Stirring mechanism; 610, Rotating shaft; 620, Stirring rod; 630, Slide rod; 640, Slide plate; 641, Connecting seat; 650, Stirring motor; 660, Top plate; 670, Dual-shaft motor; 680, Turntable; 690, Connecting rod; 700, Connecting rod; 710, First scraper; 720, Second scraper. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Figures 1-5As shown, this utility model provides a technical solution for a vacuum reactor for polyurethane prepolymer production, including a reactor 100. A discharge pipe 110 is fixed to the center of the bottom of the reactor 100. A temperature sensor 160 (model CWDZ70) is fixed to the bottom edge of the inner cavity of the reactor 100. Support feet 200 are evenly fixed to the bottom of the reactor 100. A top cover 300 is connected to the top of the reactor 100. A sealing ring 310 is fixed through the center of the top of the top cover 300. Inlet valves are symmetrically fixed to the top of the top cover 300. A suction pipe 500 is fixed to the top of the material pipe 400 and the top cover 300, and a stirring mechanism 600 is provided on the top cover 300; a solenoid valve is provided on the outside of the discharge pipe 110; a spiral cavity 120 is opened inside the reactor 100; an inlet pipe 130 is fixed at the bottom of the outer wall of the reactor 100 at the inlet of the spiral cavity 120; a pump 140 is fixed at the end of the inlet pipe 130; a suction pipe 141 is fixed at the inlet end of the pump 140; and a return pipe 150 is fixed at the top of the outer wall of the reactor 100 at the outlet of the spiral cavity 120.

[0023] Please see Figure 3 and Figure 4 The stirring mechanism 600 includes a rotating shaft 610 connected inside the sealing ring 310, with stirring rods 620 uniformly and symmetrically fixed on the outer side of the rotating shaft 610; the stirring mechanism 600 also includes a sliding rod 630 uniformly fixed to the top of the top cover 300, a sliding plate 640 sliding on the outer side of the sliding rod 630, a connecting seat 641 symmetrically fixed on the top of the sliding plate 640, a stirring motor 650 fixed at the bottom center of the sliding plate 640, a top plate 660 fixed at the top of the sliding rod 630, a dual-shaft motor 670 fixed at the top center of the top of the top plate 660, a turntable 680 fixed at the end of the output shaft of the dual-shaft motor 670, and a connecting rod 690 fixed on one side of the turntable 680; the end of the output shaft of the stirring motor 650 is fixedly connected to the top of the rotating shaft 610, and the outer wall of the rotating shaft 610 is connected to the inner wall of the sealing ring 310. The components fit tightly together; one end of the connecting rod 690 is rotatably connected to the inside of the connecting seat 641, and the connecting rod 690 is rotatably connected to the turntable 680 through the connecting shaft; with the addition of the stirring mechanism 600, the starting of the stirring motor 650 drives the rotating shaft 610 to rotate, causing the stirring rod 620 to stir. At the same time, the starting of the dual-shaft motor 670 drives the turntable 680 to rotate, thereby causing the connecting rod 690 to drive the connecting seat 641 to move up and down reciprocally, causing the sliding plate 640 to drive the stirring motor 650 to move up and down reciprocally, causing the rotating shaft 610 to drive the stirring rod 620 to move up and down reciprocally. This allows the stirring rod 620 to rotate and stir at the same time, thus avoiding the inertia caused by prolonged rotation that would result in the reactants remaining relatively stationary, making the reactants mix more thoroughly and evenly, and improving the reaction efficiency.

[0024] Please see Figure 5A connecting rod 700 is uniformly and symmetrically fixed to the outer wall of the rotating shaft 610. A first scraper 710 is fixed to the end of the connecting rod 700, and a second scraper 720 is fixed between two adjacent first scrapers 710. One side of the first scraper 710 is arc-shaped and fits against the inner wall of the reactor 100. The upper and lower sides of the second scraper 720 are provided with inclined surfaces. With the arrangement of the connecting rod 700, the first scraper 710 and the second scraper 720, when the rotating shaft 610 rotates, the connecting rod 700 drives the first scraper 710 to deflect, scraping the inner wall of the reactor 100. At the same time, when the rotating shaft 610 moves up and down, the first scraper 710 drives the second scraper 720 to move up and down, so that the second scraper 720 scrapes the inner wall of the reactor 100 from top to bottom, thereby thoroughly cleaning the inner wall of the reactor 100, avoiding reactant residue and preventing waste.

[0025] In use, this invention works as follows: During mixing production, the feed pipe 400 is first connected to the discharge pipe to deliver materials into the reaction vessel 100. Then, the extraction pipe 500 is connected to a vacuum pump to create a vacuum space. A hot heat-conducting medium (such as heated water) is connected to the suction pipe 141 via a flexible hose. The pump 140 is started to deliver the heat-conducting medium into the spiral cavity 120, which then circulates back through the return pipe 150 to heat the internal reactants. The dual-shaft motor 670 and the stirring motor 650 are then started. The stirring motor 650 drives the rotating shaft 610 to rotate, causing the stirring rod 620 to stir. Simultaneously, the dual-shaft motor 670 drives the turntable 680 to rotate, thereby causing the connecting rod 690 to... The connecting seat 641 moves up and down, causing the sliding plate 640 to drive the stirring motor 650 to move up and down, which in turn causes the rotating shaft 610 to drive the stirring rod 620 to move up and down. This causes the stirring rod 620 to rotate and stir at the same time, mixing the materials. Simultaneously, as the rotating shaft 610 moves up and down, the first scraper 710 drives the second scraper 720 to move up and down, scraping the inner wall of the reactor 100. The temperature sensor 160 monitors the temperature. When the temperature rises, the heat transfer medium is replaced with a lower temperature medium (such as room temperature water) and fed into the spiral cavity 120 to absorb and cool the heat, thereby controlling the temperature. After the reaction is completed, the discharge pipe 110 is opened to discharge the contents.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vacuum reactor for producing polyurethane prepolymer, characterized in that: The reactor includes a reaction vessel (100), a discharge pipe (110) fixed at the bottom center of the reaction vessel (100), a temperature sensor (160) fixed at the bottom edge of the inner cavity of the reaction vessel (100), support feet (200) evenly fixed at the bottom of the reaction vessel (100), a top cover (300) connected to the top of the reaction vessel (100), a sealing ring (310) fixed through the top center of the top of the top cover (300), a feed pipe (400) symmetrically fixed at the top of the top cover (300), a suction pipe (500) fixed at the top of the top cover (300), and a stirring mechanism (600) provided on the top cover (300). The stirring mechanism (600) includes a rotating shaft (610) connected inside the sealing ring (310), and stirring rods (620) evenly and symmetrically fixed on the outer side of the rotating shaft (610).

2. The vacuum reactor for producing polyurethane prepolymer according to claim 1, characterized in that: The stirring mechanism (600) further includes a slide rod (630) uniformly fixed to the top of the top cover (300). A slide plate (640) slides on the outer side of the slide rod (630). A connecting seat (641) is symmetrically fixed to the top of the slide plate (640). A stirring motor (650) is fixed to the bottom center of the slide plate (640). A top plate (660) is fixed to the top of the slide rod (630). A dual-shaft motor (670) is fixed to the top center of the top of the top plate (660). A turntable (680) is fixed to the end of the output shaft of the dual-shaft motor (670). A connecting rod (690) is fixed to one side of the turntable (680).

3. The vacuum reactor for producing polyurethane prepolymer according to claim 2, characterized in that: The output shaft end of the stirring motor (650) is fixedly connected to the top end of the rotating shaft (610), and the outer side wall of the rotating shaft (610) is tightly fitted with the inner side wall of the sealing ring (310).

4. The vacuum reactor for producing polyurethane prepolymer according to claim 2, characterized in that: One end of the connecting rod (690) is rotatably connected to the inside of the connecting seat (641), and the connecting rod (690) is rotatably connected to the turntable (680) through a connecting shaft.

5. The vacuum reactor for producing polyurethane prepolymer according to claim 1, characterized in that: An electromagnetic valve is provided on the outside of the discharge pipe (110). A spiral cavity (120) is opened inside the reactor (100). An inlet pipe (130) is fixed at the bottom of the outer wall of the reactor (100) at the inlet of the spiral cavity (120). A pump (140) is fixed at the end of the inlet pipe (130). A suction pipe (141) is fixed at the inlet end of the pump (140). A reflux pipe (150) is fixed at the top of the outer wall of the reactor (100) at the outlet of the spiral cavity (120).

6. The vacuum reactor for producing polyurethane prepolymer according to claim 2, characterized in that: The outer side wall of the rotating shaft (610) is uniformly and symmetrically fixed with connecting rods (700), and the end of the connecting rod (700) is fixed with a first scraper (710), and a second scraper (720) is fixed between two adjacent first scrapers (710).

7. A vacuum reactor for producing polyurethane prepolymer according to claim 6, characterized in that: One side of the first scraper (710) is arc-shaped and fits against the inner wall of the reactor (100), while the upper and lower sides of the second scraper (720) are provided with inclined surfaces.

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