An unsaturated polyester production apparatus having an online viscosity detection unit

Abstract

The utility model relates to the field of polyester resin preparation, concretely relates to an unsaturated polyester production device with online viscosity detection unit, including reaction kettle and viscosity detection unit, the viscosity detection unit sets up on the lateral wall of reaction kettle, the reaction kettle includes main body and respectively sets up upper head and lower head in the both ends of main body, the lateral wall of main body is equipped with first branch pipe and second branch pipe, the second branch pipe partially covers and sets up in first branch pipe, first branch pipe is used for conveying heat -carrying liquid, the second branch pipe is used for conveying to be measured liquid, the viscosity detection unit includes platform and sets up the viscosimeter on platform, is equipped with detection rod on the viscosimeter, the detection rod passes through first branch pipe and second branch pipe and is immersed in to be measured liquid. The unsaturated polyester production device with online viscosity detection unit provided by the utility model not only can make to be measured liquid keep and the reaction liquid in the reaction kettle keep the same temperature, but also can avoid to be measured liquid flow, cause detection error.

Description

Technical Field

[0001] This utility model relates to the field of polyester resin preparation, specifically to an unsaturated polyester production device with an online viscosity detection unit. Background Technology

[0002] Unsaturated polyester is a multifunctional material that is cross-linked and cured with styrene. Due to its excellent properties, flexible processing methods, and low cost, it occupies a crucial position in the composite materials industry. During unsaturated polyester production, the viscosity of the reaction solution within the production unit needs to be measured to determine whether the reaction endpoint has been reached. Because the production unit requires continuous stirring to ensure the reaction proceeds normally, this stirring can introduce significant errors in viscosity measurement. Therefore, it is necessary to remove the reaction solution for viscosity testing. However, the viscosity of the reaction solution is closely related to temperature; changes in temperature during testing can introduce errors in viscosity measurement and comparison. Utility Model Content

[0003] To overcome the error caused by the inconsistency between the temperature of the test liquid and the temperature of the reaction liquid in the production unit during existing viscosity testing, a device is needed that can keep the temperature of the test liquid consistent with the temperature of the reaction liquid in the production unit.

[0004] In view of this, the present invention provides an unsaturated polyester production apparatus with an online viscosity detection unit, comprising a reactor and a viscosity detection unit. The viscosity detection unit is disposed on the side wall of the reactor. The reactor comprises a main body and an upper end cap and a lower end cap respectively disposed at both ends of the main body. A first branch pipe and a second branch pipe are disposed on the side wall of the main body. The second branch pipe is partially sleeved inside the first branch pipe. The first branch pipe is used to transport a heated liquid, and the second branch pipe is used to transport a liquid to be tested. The viscosity detection unit comprises a platform and a viscometer disposed on the platform. The viscometer is provided with a detection rod, which passes through the first branch pipe and the second branch pipe and is immersed in the liquid to be tested.

[0005] Preferably, a first opening and a second opening are provided on the side wall of the main body near the lower end. The first opening is connected to the inlet of the first branch pipe, and the second opening is connected to the inlet of the second branch pipe. A third opening is provided on the side wall of the main body near the upper end. The outlets of the first branch pipe and the second branch pipe are connected to the third opening.

[0006] Preferably, the portions of the first and second branch pipes that come into contact with the outside are provided with an insulation layer.

[0007] Preferably, the first branch pipe is equipped with a first inlet valve and a first circulation pump, and the second branch pipe is equipped with a second inlet valve and a second circulation pump.

[0008] Preferably, the first and second circulating pumps are gear pumps or diaphragm pumps, and the first and second inlet valves are high-temperature ball valves.

[0009] Preferably, the reaction vessel is equipped with a stirring assembly, which includes a motor and a stirrer. The stirrer includes a stirring rod connected to the motor and a stirring paddle for stirring the liquid. The stirring paddle is U-shaped and fixed on the stirring rod.

[0010] Preferably, a second fixing member is connected to the platform and fixed to the side wall of the main body by the second fixing member. The second fixing member includes a horizontally arranged connecting rod and an obliquely arranged support rod, and the support rod can provide vertical support for the platform.

[0011] Preferably, multiple sets of third fasteners are provided between the viscometer and the platform. The third fasteners are L-shaped, with the vertical side close to the viscometer and the horizontal side fixed to the platform.

[0012] Preferably, the platform has a first opening for the detection rod to pass through, and several buffer pads are provided between the viscometer and the platform. The buffer pads are elastic rubber or metal elastic elements.

[0013] Preferably, the platform is provided with a second opening, in which fasteners can be installed. The second opening is elongated and slotted, and its number and position correspond to the third fixing member. The third fixing member is fixed to the platform by the fasteners.

[0014] The beneficial effects of this invention are as follows: The unsaturated polyester production apparatus with an online viscosity detection unit provided by this invention allows for the addition of polyacids and polyols to the reactor for esterification and polycondensation reactions. When the viscosity of the reaction liquid needs to be measured, liquid is introduced into the first branch pipe approximately half an hour in advance, followed by the second branch pipe. After the second branch pipe is filled with the test liquid and the mixture is circulated several times, the introduction of liquid into the second branch pipe is stopped, and viscosity measurement can then begin. This unsaturated polyester production apparatus with an online viscosity detection unit not only maintains the test liquid at the same temperature as the reaction liquid in the reactor but also avoids measurement errors caused by the flow of the test liquid. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a perspective view of an unsaturated polyester production apparatus with an online viscosity detection unit, as described in this utility model embodiment. Figure 2 Top view of an unsaturated polyester production apparatus with an online viscosity detection unit in this embodiment of the present invention; Figure 3 yes Figure 2 Sectional view along plane A-A; Figure 4 yes Figure 1 Schematic diagram of medium viscosity detection unit; Figure 5 yes Figure 1 Another schematic diagram of the medium viscosity detection unit; Figure 6 for Figure 3 Enlarged diagram of point B in the middle.

[0017] The component names and their numbers in the diagram are as follows: 100. An unsaturated polyester production apparatus equipped with an online viscosity detection unit; 1. Main body; 11. First branch pipe; 111. First inlet valve; 112. First circulation pump; 12. Second branch pipe; 121. Second inlet valve; 122. Second circulation pump; 13. First fixing component; 14. First opening; 15. Second opening; 16. Third opening; 2. Upper end cap; 21. Flange; 3. Lower end cap; 31. Discharge port; 4. Stirring assembly; 41. Motor; 42. Stirring; 421. Stirring rod; 422. Stirring paddle; 5. Viscosity detection unit; 51. Viscometer; 511. Detection rod; 512. Sleeve; 513. Mechanical seal; 52. Platform; 521. First opening; 522. Second opening; 53. Second fixing component; 531. Connecting rod; 532. Support rod; 54. Third fixing component; 541. Reinforcing rib; 542. Fastener; 55. Buffer pad. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0023] refer to Figures 1-5 This invention provides an unsaturated polyester production apparatus 100 with an online viscosity detection unit, including a reaction vessel and a viscosity detection unit 5, which is disposed on the side wall of the reaction vessel. The reaction vessel includes a main body 1 and an upper end cap 2 and a lower end cap 3 respectively disposed at both ends of the main body 1. A first branch pipe 11 and a second branch pipe 12 are provided on the side wall of the main body 1. The second branch pipe 12 is partially sleeved inside the first branch pipe 11. The first branch pipe 11 is used to transport a heated liquid, and the second branch pipe 12 is used to transport the liquid to be tested. The viscosity detection unit 5 includes a platform 52 and a viscometer 51 disposed on the platform 52. The viscometer 51 is provided with a detection rod 511, which passes through the first branch pipe 11 and the second branch pipe 12 and is immersed in the liquid to be tested.

[0024] Specifically, the inlets of the first branch pipe 11 and the second branch pipe 12 are respectively located at the lower end of the side wall of the main body 1, the outlets of the first branch pipe 11 and the second branch pipe 12 are located at the upper end of the side wall of the main body 1, and the outlet of the second branch pipe 12 is located inside the outlet of the first branch pipe 11.

[0025] Furthermore, on the side wall of the main body 1, near the lower end, there is a first opening 14 and a second opening 15. The first opening 14 is connected to the inlet of the first branch pipe 11, and the second opening 15 is connected to the inlet of the second branch pipe 12. On the side wall of the main body 1, near the upper end, there is a third opening 16. The outlets of the first branch pipe 11 and the second branch pipe 12 are connected to the third opening 16.

[0026] Specifically, the parts of the first branch pipe 11 and the second branch pipe 12 that come into contact with the outside are provided with a heat insulation layer, the upper end cap 2 is provided with several flange ports 21 for connecting the feed pipe, and the lower end cap 3 is provided with a discharge port 31 for discharging the product after the reaction is completed. The first branch pipe 11 is equipped with a first inlet valve 111 and a first circulation pump 112, and the second branch pipe 12 is equipped with a second inlet valve 121 and a second circulation pump 122. When the unsaturated polyester production device 100 with an online viscosity detection unit provided by this utility model is in use, the reactor is filled with liquid reaction solution at a temperature of about 150~200 degrees Celsius. The first inlet valve 111 is opened and the first circulation pump 112 is started, so that the first branch pipe 11 is not filled with reaction solution. The high temperature of the reaction solution can heat the second branch pipe 12, so that the temperature of the second branch pipe 12 is close to the temperature of the reaction solution in the reactor. When it is necessary to detect viscosity, the second inlet valve 121 is opened and the second circulation pump 122 is started, so that the reaction solution enters the first circulation pump 112. After the first circulation pump 112 is running for 5~10 minutes and is filled with reaction solution, the second inlet valve 121 and the second circulation pump 122 are closed to prevent the reaction solution in the second circulation pump 122 from flowing and affecting the accuracy of viscosity detection. The viscosity detection unit 5 is then turned on to perform viscosity detection. The second branch pipe 12 is set up so that the first branch pipe 11 can be preheated before viscosity testing and the test liquid can be kept warm during viscosity testing.

[0027] Specifically, the viscometer 51 is a rotary viscometer, the first circulation pump 112 and the second circulation pump 122 are gear pumps or diaphragm pumps, and the first inlet valve 111 and the second inlet valve 121 are high-temperature ball valves.

[0028] Specifically, the reactor is equipped with a stirring assembly 4 for stirring the reaction liquid. The stirring assembly 4 includes a motor 41 and a stirrer 42. The stirrer 42 includes a stirring rod 421 connected to the motor 41 and a stirring paddle 422 for stirring the liquid. The stirring paddle 422 is U-shaped and fixed on the stirring rod 421.

[0029] In some embodiments, a first fixing member 13 is provided between the second branch pipe 12 and the main body 1 for fixing the second branch pipe 12.

[0030] refer to Figure 4 and Figure 5As shown, a second fixing member 53 is connected to the platform 52 and is fixed to the side wall of the main body 1 by the second fixing member 53. The second fixing member 53 includes a horizontally arranged connecting rod 531 and an obliquely arranged support rod 532. The support rod 532 can provide vertical support for the platform 52.

[0031] The platform 52 is provided with a first opening 521 for the detection rod 511 to pass through. Several buffer pads 55 are also provided between the viscometer 51 and the platform 52. The buffer pads 55 are elastic rubber or metal elastic parts. Since the stirring in the reaction vessel needs to rotate continuously, the flow of the reaction liquid in the vessel will cause the main body 1 to vibrate. Setting the buffer pads 55 can reduce the vibration of the viscometer 51, reduce the error, and increase the service life of the viscometer 51.

[0032] In some embodiments, a third fixing member 54 is provided between the viscometer 51 and the platform 52. The third fixing member 54 is L-shaped, with its vertical edge close to the viscometer 51 and its horizontal edge fixed to the platform 52. Two or more sets of the third fixing members 54 are provided, and the viscometer 51 is located between the two or more sets of the third fixing members 54.

[0033] In one embodiment, the platform 52 is provided with a second opening 522, which is a long slot. The number and position of the second opening 522 correspond to the third fixing member 54. The third fixing member 54 is fixed to the platform 52 by fasteners 542. After loosening the fasteners 542, the distance between the two third fixing members 54 can be adjusted through the second opening 522 to limit the movement of the viscometer 51 in the horizontal direction.

[0034] In some embodiments, the third fastener 54 is provided with reinforcing ribs 541 to increase the firmness of the third fastener 54.

[0035] refer to Figure 6 As shown, in some embodiments, a sleeve 512 is provided where the detection rod 511 is inserted into the first branch pipe 11 and the second branch pipe 12. The sleeve 512 is a circular tube, and the tube wall can contact the reaction liquid in the interlayer formed by the first branch pipe 11 and the second branch pipe 12 with the detection rod 511. A mechanical seal 513 is provided at the lower end of the sleeve 512, which can prevent the reaction liquid to be tested in the second branch pipe 12 from leaking.

[0036] The unsaturated polyester production apparatus 100 with an online viscosity detection unit provided by this utility model involves the following steps: During operation, polyacids and polyols are added to the reactor for esterification and polycondensation reactions. When viscosity of the reaction solution needs to be measured, the first inlet valve 111 is opened and the first circulation pump 112 is started approximately half an hour in advance, allowing the reaction solution to circulate through the first branch pipe 11 and heat the second branch pipe 12. Then, the second inlet valve 121 is opened and the second circulation pump 122 is started, continuing for 3-5 minutes to fill the second branch pipe 12 with the reaction solution and circulate it for a period of time. The first circulation pump 112 and the first inlet valve 111 are then closed, stopping the flow of the test solution in the second branch pipe 12. The viscometer 51 is then turned on to measure the viscosity of the test solution in the second branch pipe 12. Later in the reaction, when it is necessary to measure the viscosity of the reaction solution at any time, the first inlet valve 111 and the first circulation pump 112, the second inlet valve 121 and the second circulation pump 122 can be kept open. When viscosity measurement is needed, the second circulation pump 122 and the second inlet valve 121 are closed, allowing immediate viscosity measurement. The unsaturated polyester production apparatus 100 with an online viscosity detection unit provided by this utility model can not only keep the liquid to be tested at the same temperature as the reaction liquid in the reactor, but also avoid the liquid to be tested flowing and causing detection errors.

[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An unsaturated polyester production apparatus with an online viscosity detection unit, characterized in that: The reaction vessel includes a reaction vessel and a viscosity detection unit (5). The viscosity detection unit (5) is set on the side wall of the reaction vessel. The reaction vessel includes a main body (1) and an upper end cap (2) and a lower end cap (3) respectively set at both ends of the main body (1). The side wall of the main body (1) is provided with a first branch pipe (11) and a second branch pipe (12). The second branch pipe (12) is partially sleeved inside the first branch pipe (11). The first branch pipe (11) is used to transport the heated liquid, and the second branch pipe (12) is used to transport the liquid to be tested. The viscosity detection unit (5) includes a platform (52) and a viscometer (51) set on the platform (52). The viscometer (51) is provided with a detection rod (511). The detection rod (511) passes through the first branch pipe (11) and the second branch pipe (12) and is immersed in the liquid to be tested.

2. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: On the side wall of the main body (1), near the lower end, there is a first opening (14) and a second opening (15). The first opening (14) is connected to the inlet of the first branch pipe (11), and the second opening (15) is connected to the inlet of the second branch pipe (12). On the side wall of the main body (1), near the upper end, there is a third opening (16). The outlets of the first branch pipe (11) and the second branch pipe (12) are connected to the third opening (16).

3. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: The portions of the first branch pipe (11) and the second branch pipe (12) that are in contact with the outside are provided with a heat insulation layer.

4. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: The first branch pipe (11) is equipped with a first inlet valve (111) and a first circulation pump (112), and the second branch pipe (12) is equipped with a second inlet valve (121) and a second circulation pump (122).

5. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 4, characterized in that: The first circulating pump (112) and the second circulating pump (122) are gear pumps or diaphragm pumps, and the first inlet valve (111) and the second inlet valve (121) are high-temperature ball valves.

6. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: The reactor is equipped with a stirring assembly (4), which includes a motor (41) and a stirrer (42). The stirrer (42) includes a stirring rod (421) connected to the motor (41) and a stirring paddle (422) for stirring the liquid. The stirring paddle (422) is U-shaped and fixed on the stirring rod (421).

7. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: The platform (52) is connected to a second fastener (53), which is fixed to the side wall of the main body (1). The second fastener (53) includes a horizontally arranged connecting rod (531) and an obliquely arranged support rod (532). The support rod (532) can provide vertical support for the platform (52).

8. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: Multiple sets of third fasteners (54) are provided between the viscometer (51) and the platform (52). The third fasteners (54) are L-shaped, with the vertical side close to the viscometer (51) and the horizontal side fixed to the platform (52).

9. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: The platform (52) is provided with a first opening (521) for the detection rod (511) to pass through. Several buffer pads (55) are also provided between the viscometer (51) and the platform (52). The buffer pads (55) are elastic rubber or metal elastic elements.

10. The unsaturated polyester production apparatus with an online viscosity detection unit according to claim 1, characterized in that: The platform (52) is provided with a second opening (522), and a fastener (542) can be installed in the second opening (522). The second opening (522) is a long slot, and its number and position correspond to the third fixing member (54). The third fixing member (54) is fixed on the platform (52) by the fastener (542).

Images