Casting type polyurethane prepolymer production device

Abstract

The utility model relates to the technical field of casting type polyurethane prepolymer production, and particularly discloses a casting type polyurethane prepolymer production device which comprises a reaction kettle I and a reaction kettle II, the output end of the reaction kettle I and the input end of the reaction kettle II are connected with the discharge pipeline; the reaction kettle I and the reaction kettle II are connected with the temperature control pipelines. According to the utility model, the reaction kettle I and the reaction kettle II are arranged, so that polyol and isocyanate are in different kettles, and the polyol is added into the reaction kettle II corresponding to the isocyanate when a reaction is needed; in this way, continuous operation of the first reaction kettle is not affected, that is, in the last heating reaction and the subsequent packaging operation process in the second reaction kettle, the first reaction kettle can conduct preparation work such as feeding and detection of polyol components of the next batch; and the reaction kettle I and the reaction kettle II do not influence each other, so that the product quality is not influenced, and the production and processing efficiency is also improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of casting type polyurethane prepolymer production, in particular to a casting type polyurethane prepolymer production device. Background Art

[0002] Castable polyurethane prepolymer (CPU), also known as cast polyurethane elastomer, is a chemically processed material whose material system is liquid before molding. This material system, in principle, does not contain volatile liquids, resulting in excellent processability and moldability. CPU's unique properties as a liquid rubber or liquid elastomer make molding simpler than traditional TPU and MPU. The resulting elastomer has a high degree of molecular integrity and excellent overall performance. CPU products feature high mechanical strength, excellent wear resistance, and excellent resistance to oil, hydrolysis, solvents, heat, high pressure, self-lubrication, and high and low temperatures.

[0003] The current production process for polyurethane prepolymers (PUs) uses oligomer polyols and isocyanates as primary raw materials. There are two production processes for cast polyurethane prepolymers: one involves first adding the desired polyol type and a small amount of additives to a reactor. Once the contents have passed moisture testing, a specified amount of isocyanate is added. The other involves first adding the specified type and amount of isocyanate to the reactor, followed by either a stepwise or all-at-once addition of the polyol and additives to facilitate a rapid reaction. Both production processes are performed within a single reactor. Consequently, in the first process, if the overall moisture content of the polyol in the reactor is too high during moisture testing, subsequent production processes must be halted and a lengthy dehydration process performed. Furthermore, in the second process, the temperature of the pre-baked polyol or the polyol fed from the pipeline is often too high. Directly adding the pre-baked polyol to the reactor (the reaction itself is exothermic) can easily cause temperature runaway within the reactor, leading to poor final product quality. Furthermore, effective monitoring and control of the moisture content of all polyols is impossible, compromising product quality. In summary, both production processes are carried out in one reactor. Regardless of the first or second production process, the above problems occur during the production process, which, on the one hand, affects the quality of the product and, on the other hand, reduces the production and processing efficiency. Utility Model Content

[0004] The present invention aims to solve the problem that both the two production processes in the prior art are carried out in one reactor. Regardless of whether it is the first production process or the second production process, the above-mentioned problems occur during the production process, which on the one hand affects the quality of the product and on the other hand reduces the production and processing efficiency. The following technical solutions are proposed:

[0005] A casting polyurethane prepolymer production device, comprising:

[0006] Reactor 1 and Reactor 2, Reactor 1 is equipped with a feed line 1 for adding polyol into Reactor 1; Reactor 2 is equipped with a feed line 2 for adding isocyanate into Reactor 2;

[0007] A discharge pipeline, wherein the output end of the reactor 1 and the input end of the reactor 2 are connected to the discharge pipeline;

[0008] Temperature control pipelines: Reactor 1 and Reactor 2 are both connected with temperature control pipelines for controlling the temperature inside Reactor 1 and Reactor 2.

[0009] As a preferred embodiment of the above technical solution, the temperature control pipeline includes a cooling pipeline and a steam pipeline, wherein a group of cooling pipelines and steam pipelines are respectively provided on the reactor 1 and the reactor 2.

[0010] As a preferred embodiment of the above technical solution, the corresponding steam pipeline on the reactor includes a steam condensate discharge pipeline and a steam inlet pipeline, and the corresponding cooling pipeline on the reactor includes a cooling water inlet pipeline and a cooling water return pipeline.

[0011] As a preferred embodiment of the above technical solution, the corresponding steam pipeline on the reactor 2 includes a steam condensate discharge pipeline 2 and a steam inlet pipeline 2, and the corresponding cooling pipeline on the reactor 2 includes a cooling water inlet pipeline 2 and a cooling water return pipeline 2.

[0012] As a preferred embodiment of the above technical solution, the reactor 1 is connected to a drainage pipeline 1, and the reactor 2 is connected to a drainage pipeline 2.

[0013] As a preferred embodiment of the above technical solution, the first reactor is connected to a vacuum pipeline 1, and the second reactor is connected to a vacuum pipeline 2.

[0014] As a preferred embodiment of the above technical solution, the reactor 1 is connected to a nitrogen inlet pipeline 1, and the reactor 2 is connected to a nitrogen inlet pipeline 2.

[0015] As a preferred embodiment of the above technical solution, a regulating valve is installed on the discharge pipeline.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model sets up reactor 1 and reactor 2, so that the polyol and isocyanate are in different reactors. When the reaction is required, the polyol is added to the reactor 2 corresponding to the isocyanate; this does not affect the continued operation of reactor 1. That is, when the previous temperature reaction and subsequent packaging operation are carried out in reactor 2, reactor 1 can carry out preparation work such as feeding and testing of the next batch of polyol components; reactor 1 and reactor 2 do not affect each other, which will not affect the quality of the product and also improve the production and processing efficiency;

[0018] 2. The utility model controls the temperature in the reactor 1 and the reactor 2 through the temperature control pipeline, so that the materials in the reactor reach the appropriate temperature. On the one hand, the water discharge speed of the polyol is improved and the temperature of the polyol when entering the reactor 2 is controlled. On the other hand, the temperature when the polyol reacts with the isocyanate is controlled. Overall, the production and processing efficiency is improved, and the influence of factors such as temperature on the product quality is avoided.

[0019] 3. Compared with the traditional intermittent production with a single kettle, the utility model fundamentally solves the abnormal hidden dangers or condition limitations that may affect the product quality during the production of cast polyurethane prepolymers, whether the polyol component or the isocyanate component is added first. It is also more excellent in controlling the reaction rate, and the quality of the products produced will be more excellent and stable.

[0020] 4. The utility model can accurately control the amount of polyol and isocyanate entering the kettle by setting a weighing module and a mass flow meter, thereby improving the quality of the produced products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the topological structure of the utility model.

[0022] In the picture:

[0023] 1. Feed pipeline 1; 2. Weighing module; 3. Cooling water inlet pipeline 1; 4. Cooling water return pipeline 1; 5. Drain pipeline 1; 6. Steam condensate drain pipeline 1; 7. Steam inlet pipeline 1; 8. Vacuum pipeline 1; 9. Nitrogen inlet pipeline 1; 10. Discharge pipeline; 11. Control valve; 12. Feed pipeline 2; 13. Mass flow meter; 14. Cooling water inlet pipeline 2; 15. Cooling water return pipeline 2; 16. Drain pipeline 2; 17. Steam inlet pipeline 2; 18. Vacuum pipeline 2; 19. Remote pressure gauge; 20. Nitrogen inlet pipeline 2; 21. Bottom valve; 22. Agitator 1; 23. Agitator 2; 24. Reactor 1; 25. Reactor 2; 26. Steam condensate drain pipeline 2. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0025] Example

[0026] like Figure 1 As shown, a casting type polyurethane prepolymer production device includes:

[0027] Reactor 1 24 and reactor 2 25, reactor 1 24 is equipped with a feed line 1 for adding polyol to reactor 1 24; reactor 2 25 is equipped with a feed line 2 12 for adding isocyanate to reactor 2 25;

[0028] The discharge pipeline 10 is connected to the output end of the reactor 1 24 and the input end of the reactor 2 25;

[0029] Temperature control pipelines are connected to reactor 1 24 and reactor 2 25 to control the temperature inside reactor 1 24 and reactor 2 25.

[0030] In one case of this embodiment, a weighing module 2 is installed on the reactor 1 24 to display and control the amount of polyol added. At the same time, it can be interlocked with the feed valve on the feed line 1. When the amount of polyol reaches the set amount of the formula, the feed valve on the feed line 1 is closed, thereby ensuring the accurate amount of polyol added; a mass flow meter 13 is installed on the reactor 2 25 to ensure the accurate amount of isocyanate component added to the reactor 2 25; and a stirrer 1 22 and a stirrer 2 23 are installed on the reactor 1 24 and the reactor 2 25 respectively, so as to stir the materials in the reactor to facilitate material mixing.

[0031] In actual application of this embodiment, the feed valve on the feed line 1 is opened to add polyol to the reactor 24. At the same time, the weighing module 2 is used to display and control the amount of the added polyol. After the polyol is added, the stirrer 22 can be turned on. After stirring for a period of time, a sample is taken to detect the comprehensive moisture content of the polyol in the reactor. If the moisture index is qualified, the temperature inside the reactor 24 is cooled through the temperature control pipeline and cooled to a specified temperature, so that the temperature of the polyol will not be too high when it enters the reactor 25, which is not easy to cause the contents in the reactor to be saturated. The temperature of the material is out of control, resulting in abnormal quality of the final product; when the moisture index of the polyol in the reactor 1 24 is tested, isocyanate can be added to the reactor 2 25 without affecting the continued operation of the reactor 1 24, that is, when the last temperature rising reaction and subsequent packaging operation are carried out in the reactor 2 25, the reactor 1 24 can carry out preparations such as feeding and testing of the next batch of polyol components; there is no influence between the reactor 1 24 and the reactor 2 25, which will not affect the quality of the product and also improve the production and processing efficiency.

[0032] Furthermore, the temperature control pipeline includes a cooling pipeline and a steam pipeline, wherein the reactor 1 24 and the reactor 2 25 are respectively provided with a group of cooling pipelines and steam pipelines.

[0033] In actual application of this embodiment, the temperature inside the reactor 1 24 and the reactor 2 25 is controlled by the cooling line and the steam line connected to the reactor 1 24 and the reactor 2 25 respectively, thereby improving the processing efficiency.

[0034] Furthermore, the corresponding steam pipeline on the reactor 24 includes a steam condensate discharge pipeline 6 and a steam air inlet pipeline 7, and the corresponding cooling pipeline on the reactor 24 includes a cooling water inlet pipeline 3 and a cooling water return pipeline 4.

[0035] In actual application of this embodiment, the steam condensate discharge pipeline 6 and the steam air inlet pipeline 7 increase the temperature of the reactor 24, and the cooling water inlet pipeline 3 and the cooling water return pipeline 4 reduce the temperature of the reactor 24.

[0036] Furthermore, the steam pipeline corresponding to the second reactor 25 includes a second steam condensate discharge pipeline 26 and a second steam inlet pipeline 17 , and the cooling pipeline corresponding to the second reactor 25 includes a second cooling water inlet pipeline 14 and a second cooling water return pipeline 15 .

[0037] In actual application of this embodiment, the steam condensate discharge pipeline 26 and the steam inlet pipeline 17 increase the temperature of the reactor 25, and the cooling water inlet pipeline 14 and the cooling water return pipeline 15 reduce the temperature of the reactor 25.

[0038] Furthermore, the reactor 1 24 is connected to a drainage pipeline 1 5 , and the reactor 2 25 is connected to a drainage pipeline 2 16 .

[0039] In actual application of this embodiment, the function of drain line 1 5 and drain line 2 16 is to quickly drain a large amount of water in the external coil of the reactor. Opening the valve of the drain line to drain water before heating and then heating helps prevent the occurrence of "water hammer". After heating, the valve of the drain line is closed in time to prevent steam loss and waste.

[0040] Furthermore, the reactor 1 24 is connected to a vacuum line 1 8 , and the reactor 2 25 is connected to a vacuum line 2 18 .

[0041] In actual application of this embodiment, when the moisture content of the polyol in reactor 1 24 is too high, the valve on vacuum line 1 8 is opened to perform vacuum dehydration treatment on reactor 1 24, and the temperature in reactor 1 24 is increased to further accelerate the discharge of moisture from the polyol, thereby improving production and processing efficiency; vacuum line 2 18 is used to perform vacuum degassing treatment on reactor 2 25, and a remote pressure gauge 19 is installed on reactor 2 25. In conjunction with the pressure display of the remote pressure gauge 19, the material in reactor 2 25 is subjected to step-by-step vacuum degassing. After the degassing is completed, the vacuum can be stopped and samples can be taken to detect the indicators of the finished product.

[0042] Furthermore, the reactor 1 24 is connected to a nitrogen inlet pipeline 1 9 , and the reactor 2 25 is connected to a nitrogen inlet pipeline 2 20 .

[0043] In actual application of this embodiment, nitrogen inlet pipeline 1 9 and nitrogen inlet pipeline 2 20 both play the role of assisting in unloading. A proper amount of nitrogen is added to reactor 1 24 and reactor 2 25 through nitrogen inlet pipeline 1 9 and nitrogen inlet pipeline 2 20, respectively, which speeds up the speed at which polyol enters reactor 2 25, speeds up the unloading speed of the finished product after the reaction, and assists in subsequent packaging, thereby improving the efficiency of production and processing.

[0044] Furthermore, a regulating valve 11 is installed on the discharge pipeline 10 .

[0045] In actual application of this embodiment, the flow rate of the polyol in the discharge pipeline 10 can be controlled by controlling the regulating valve 11. The opening and closing degree of the regulating valve 11 is adjusted according to the reaction activity of the polyol. If the activity of the polyol is fast, the opening is small, and if the activity of the polyol is slow, the opening is large.

[0046] Working principle: In specific application, open the feed valve on the feed pipeline-1 to add polyol to the reactor-24, and at the same time cooperate with the weighing module 2 to display and control the amount of polyol added. After the polyol is added, turn on the stirrer-22, and after stirring for a period of time, take samples to detect the comprehensive moisture content of the polyol in the reactor. If the moisture index is qualified, cool the reactor-24 through the cooling water inlet pipeline-3 and the cooling water return pipeline-4 and reduce it to the specified temperature, so that the temperature of the polyol will not be too high when it enters the reactor-25, so that it is not easy to cause the temperature of the material in the reactor to get out of control, resulting in abnormal quality of the final product; if the water content is too high, the reactor-24 will be cooled to a specified temperature through the cooling water inlet pipeline-3 and the cooling water return pipeline-4. If the water content is too high, first open the valve on the drainage line 5 to drain the water. After draining, heat the reactor 24 through the steam condensate drainage line 6 and the steam intake line 7, close the valve on the drainage line 5, and open the valve on the vacuum line 8 to perform vacuum dehydration on the reactor 24, so as to achieve the purpose of dehydration. After a period of time, take samples of the polyol in the reactor to test the moisture content. If the moisture content is qualified, the polyol in the reactor can be subjected to the aforementioned cooling operation. If it is unqualified, repeat the dehydration operation until it is qualified. When testing the moisture index of the polyol in the reactor 24, the feed line 12 and the mass flow meter can be used to check the moisture content of the polyol in the reactor. 13 Add an accurate amount of isocyanate component to the reactor 25, then open the valve on the nitrogen inlet pipeline 19 to add an appropriate amount of nitrogen to the reactor 24 and then close it. Then open the discharge valve at the bottom of the reactor 24, start the agitator 23, open the regulating valve 11 to a suitable opening, open the valves on the cooling water inlet pipeline 214 and the cooling water return pipeline 215 to cool the reactor 25. If the reaction components react slowly, open the valve on the drain line 216 after all the polyol components in the reactor 24 are filled. After draining, open the valves on the steam condensate drain line 226 and the steam inlet pipeline 217. Valve, close the valve on the drainage line 2 16, heat the reactor 2 25 to the specified temperature and then stop the heating operation. After the temperature of the reactor 2 25 is heated to the specified temperature (the heat released by the exothermic reaction itself can be used to slowly heat it to the specified temperature for a faster reaction), it can be kept at a constant temperature for a period of time according to the constant temperature requirements, and then open the valve on the vacuum line 2 18 and cooperate with the pressure display of the remote pressure gauge 19 to perform step-by-step vacuum degassing on the material in the reactor 2 25. After the degassing is completed, the vacuum can be stopped, and samples can be taken to test the finished product indicators. If qualified, the valve on the nitrogen inlet line 20 can be opened to add an appropriate amount of nitrogen and then closed, and then the bottom valve 21 can be opened for packaging operations.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A casting polyurethane prepolymer production device, characterized in that, include: Reactor 1 (24) and reactor 2 (25), reactor 1 (24) is provided with a feed line 1 (1) for adding polyol into reactor 1 (24); reactor 2 (25) is provided with a feed line 2 (12) for adding isocyanate into reactor 2 (25); A discharge pipeline (10), wherein the output end of the reactor 1 (24) and the input end of the reactor 2 (25) are connected to the discharge pipeline (10); Temperature control pipelines are connected to the reactor 1 (24) and the reactor 2 (25) to control the temperature inside the reactor 1 (24) and the reactor 2 (25).

2. The pouring polyurethane prepolymer production device according to claim 1, characterized in that The temperature control pipeline includes a cooling pipeline and a steam pipeline, wherein the reactor 1 (24) and the reactor 2 (25) are respectively provided with a group of cooling pipelines and steam pipelines.

3. The pouring polyurethane prepolymer production device according to claim 2, characterized in that: The steam pipeline corresponding to the reactor 1 (24) includes a steam condensate discharge pipeline 1 (6) and a steam air inlet pipeline 1 (7), and the cooling pipeline corresponding to the reactor 1 (24) includes a cooling water inlet pipeline 1 (3) and a cooling water return pipeline 1 (4).

4. The pouring type polyurethane prepolymer production device according to claim 2, characterized in that, The corresponding steam pipeline on the reactor 2 (25) includes a steam condensate drain pipeline 2 (26) and a steam inlet pipeline 2 (17), and the corresponding cooling pipeline on the reactor 2 (25) includes a cooling water inlet pipeline 2 (14) and a cooling water return pipeline 2 (15).

5. The pouring polyurethane prepolymer production device according to claim 2, characterized in that: The reactor 1 (24) is connected to a drainage pipeline 1 (5), and the reactor 2 (25) is connected to a drainage pipeline 2 (16).

6. The pouring type polyurethane prepolymer production device according to claim 2, characterized in that, The reactor 1 (24) is connected to a vacuum pipeline 1 (8), and the reactor 2 (25) is connected to a vacuum pipeline 2 (18).

7. The pouring polyurethane prepolymer production device according to claim 2, characterized in that: The reactor 1 (24) is connected to a nitrogen inlet pipeline 1 (9), and the reactor 2 (25) is connected to a nitrogen inlet pipeline 2 (20).

8. The pouring polyurethane prepolymer production device according to claim 2, characterized in that: A regulating valve (11) is installed on the discharge pipeline (10).

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