High-efficiency preparation device for PBAT biodegradable resin

Abstract

The utility model discloses a kind of PBAT biodegradable resin high-efficiency preparation device, it is related to polyester production technical field, main purpose is to improve the polymerization degree of biodegradable resin, so that the viscosity index of polyester chip meets the demand of downstream product processing.The main technical scheme of the utility model is as follows:PBAT biodegradable resin high-efficiency preparation device, the device includes: the terminal shrinkage cauldron, melt cooler, dynamic mixer, dynamic viscosity instrument and granulator connected in turn;Wherein, the inlet of melt cooler is connected to chain extender mechanism, temperature sensor and pressure sensor are installed in the pipeline between dynamic mixer and dynamic viscosity instrument.

Description

Technical Field

[0001] This utility model relates to the field of polyester production technology, and in particular to a high-efficiency preparation device for PBAT biodegradable resin. Background Technology

[0002] The application research of biodegradable polyester materials has flourished. Common biodegradable polyester materials include polycaprolactone (PCL), polyglycolic acid (PGA), polylactic acid (PLA), polybutylene succinate (PBS), and polybutylene adipate (PBAT), which can be applied in various fields such as packaging, catering, and agriculture.

[0003] The production process of the aforementioned polyester materials generally includes esterification, diesterification, prepolymerization, final polymerization, pelleting, and packaging. However, the viscosity of the polyester chips formed by subsequent pelleting inevitably fails to meet the processing requirements of downstream products. Utility Model Content

[0004] In view of this, the present invention provides a high-efficiency preparation device for PBAT biodegradable resin, the main purpose of which is to improve the degree of polymerization of biodegradable resin so that the viscosity index of polyester chips meets the requirements of downstream product processing.

[0005] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0006] This invention provides a high-efficiency preparation device for PBAT biodegradable resin, which includes: a final shrinkage vessel, a melt cooler, a dynamic mixer, a dynamic viscometer, and a pelletizer connected in sequence.

[0007] The inlet of the melt cooler is connected to the chain extender mechanism, and the pipe between the dynamic mixer and the dynamic viscometer is equipped with a temperature sensor and a pressure sensor.

[0008] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0009] Optionally, it also includes a thickening reactor, a thickening discharge pump, and a thickening discharge melt pipe. The melt cooler, the dynamic mixer, and the dynamic viscometer are arranged in sequence to form a first pipeline. The thickening reactor, the thickening discharge pump, and the thickening discharge melt pipe are arranged in sequence to form a second pipeline. The first pipeline and the second pipeline are connected in parallel.

[0010] Optionally, it also includes a first melt three-way valve and a second melt three-way valve, wherein the first end of the first melt three-way valve is connected to the final shrinkage vessel, the second end of the first melt three-way valve is connected to the inlet of the first pipeline, the third end of the first melt three-way valve is connected to the inlet of the second pipeline, the first end of the second melt three-way valve is connected to the outlet of the first pipeline, the second end of the second melt three-way valve is connected to the outlet of the second pipeline, and the third end of the second melt three-way valve is connected to the pelletizer.

[0011] Optionally, the thickening discharge melt pipe includes multiple straight pipe sections and multiple arc-shaped pipe sections, which are alternately connected to form a deflection path.

[0012] Optionally, it also includes a discharge pump and a melt filter, wherein the final shrinkage vessel, the discharge pump, the melt filter and the first end of the first melt three-way valve are connected in sequence.

[0013] Optionally, a booster pump is also included, the inlet of which is connected to the third end of the second melt three-way valve, and the outlet of which is connected to the pelletizer.

[0014] By employing the above technical solution, this utility model has at least the following advantages:

[0015] The polyester melt exiting the final shrinkage vessel and the chain extender supplied by the chain extender mechanism simultaneously pass through the tube side of the melt cooler and the dynamic mixer in sequence.

[0016] When passing through the melt cooler, the temperature of the polyester melt decreases, which reduces the fluidity of the polyester melt. This prolongs the residence time of the polyester melt and chain extender in the pipeline. The dynamic mixer is also a device that prolongs the residence time of materials, so that the reaction can proceed fully in a near-homogeneous and continuous state. Finally, the reaction product reaches the pelletizer to complete the granulation.

[0017] Temperature sensor, pressure sensor and dynamic viscometer are connected to the input terminal of the controller, and the output terminal of the controller is connected to the terminal of the shell-side refrigerant delivery pump of the melt cooler. Temperature sensor, pressure sensor and dynamic viscometer monitor the temperature, pressure and viscosity of polyester melt in the pipeline respectively. Through integral feedback control, the temperature of polyester melt in the pipeline is controlled within the specified range. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a high-efficiency PBAT biodegradable resin preparation device provided in an embodiment of the present invention.

[0019] The reference numerals in the accompanying drawings include: 1. Final shrinkage vessel; 2. Melt cooler; 3. Dynamic mixer; 4. Dynamic viscometer; 5. Pelletizer; 6. Temperature sensor; 7. Pressure sensor; 8. Chain extender vessel; 9. Chain extender metering pump; 10. Thickening vessel; 11. Thickening discharge pump; 12. Thickening discharge melt pipe; 13. First melt three-way valve; 14. Second melt three-way valve; 1201. Straight pipe section; 1202. Arc-shaped pipe section; 15. Discharge pump; 16. Melt filter; 17. Booster pump. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a high-efficiency preparation device for PBAT biodegradable resin, which includes: a final shrinkage vessel 1, a melt cooler 2, a dynamic mixer 3, a dynamic viscometer 4, and a pelletizer 5 connected in sequence.

[0023] The inlet of the melt cooler 2 is connected to the chain extender mechanism, and the pipe between the dynamic mixer 3 and the dynamic viscometer 4 is equipped with a temperature sensor 6 and a pressure sensor 7.

[0024] The working process of the high-efficiency PBAT biodegradable resin preparation device is as follows:

[0025] The polyester melt exiting the final shrinking vessel 1 and the chain extender provided by the chain extender mechanism simultaneously pass through the tube side of the melt cooler 2 and the dynamic mixer 3 in sequence.

[0026] When passing through the melt cooler 2, the temperature of the polyester melt decreases, thereby reducing the fluidity of the polyester melt. This prolongs the residence time of the polyester melt and chain extender in the pipeline. The dynamic mixer 3 is also a device that prolongs the residence time of the material, so that the reaction can proceed fully in a near-homogeneous and continuous state. Finally, the reaction product reaches the pelletizer 5 to complete the granulation.

[0027] Temperature sensor 6, pressure sensor 7, and dynamic viscometer 4 are connected to the input terminal of the controller. The output terminal of the controller is connected to the refrigerant delivery pump terminal of the shell side of the melt cooler 2. Temperature sensor 6, pressure sensor 7, and dynamic viscometer 4 monitor the temperature, pressure, and viscosity of the polyester melt in the pipeline, respectively. Through integral feedback control, the temperature of the polyester melt in the pipeline is controlled within the specified range.

[0028] Specifically, the chain extender mechanism includes a chain extender kettle 8 and a chain extender metering pump 9 connected in sequence, with the outlet of the chain extender metering pump 9 connected to the tube inlet of the melt cooler 2.

[0029] Specifically, the temperature of the polyester melt in the pipeline behind the dynamic mixer 3 is 225-245℃, the pressure is 0.4-0.5MPa, and the viscosity is 1.5-1.6dl / g.

[0030] Specifically, the melt cooler 2 adopts a shell and tube heat exchanger. The polyester melt flows through the tube side of the melt cooler 2, and the BDO required for the esterification stage flows through the shell side as a coolant. On the one hand, it reduces the temperature of the polyester melt to the specified range, and on the other hand, it increases the temperature of the esterification reaction material.

[0031] In a specific embodiment, it also includes a thickening reactor 10, a thickening discharge pump 11, and a thickening discharge melt pipe 12. The melt cooler 2, the dynamic mixer 3, and the dynamic viscometer 4 are arranged in sequence to form a first pipeline. The thickening reactor 10, the thickening discharge pump 11, and the thickening discharge melt pipe 12 are arranged in sequence to form a second pipeline. The first pipeline and the second pipeline are connected in parallel.

[0032] In this embodiment, specifically, in the first pipeline, the polyester melt reacts with the chain extender to increase the degree of polymerization of the final product; in the second pipeline, melt thickening is achieved to obtain a high-viscosity polyester product.

[0033] This implementation method enables simultaneous production using two processes.

[0034] In a specific embodiment, it also includes a first melt three-way valve 13 and a second melt three-way valve 14. The first end of the first melt three-way valve 13 is connected to the final shrinkage vessel 1, the second end of the first melt three-way valve 13 is connected to the inlet of the first pipeline, the third end of the first melt three-way valve 13 is connected to the inlet of the second pipeline, the first end of the second melt three-way valve 14 is connected to the outlet of the first pipeline, the second end of the second melt three-way valve 14 is connected to the outlet of the second pipeline, and the third end of the second melt three-way valve 14 is connected to the pelletizer 5.

[0035] In this embodiment, the first pipeline or the second pipeline can be selectively opened by switching the valve position of the first melt three-way valve 13 and the valve position of the second melt three-way valve 14.

[0036] In a specific embodiment, the thickening discharge melt pipe 12 includes multiple straight pipe sections 1201 and multiple arc-shaped pipe sections 1202, which are alternately connected to form a deflection path.

[0037] In this embodiment, specifically, firstly, two adjacent straight pipe sections 1201 are connected by an arc-shaped pipe section 1202, allowing the polyester melt to smoothly transition between the two adjacent straight pipe sections 1201. The thickening discharge melt pipe 12 is a zigzag flow path, which prolongs the residence time of the polyester melt and facilitates the full reaction of the polyester melt.

[0038] In a specific embodiment, it also includes a discharge pump 15 and a melt filter 16, and the final shrinkage vessel 1, the discharge pump 15, the melt filter 16 and the first end of the first melt three-way valve 13 are connected in sequence.

[0039] In this embodiment, specifically, the discharge pump 15 pressurizes the polyester melt flowing out of the final shrinkage vessel 1 to provide a stable material flow for the polyester thickening reaction or chain extension reaction. At the same time, the melt filter 16 filters the polymers in the material to avoid affecting the smooth progress of subsequent reactions.

[0040] In a specific embodiment, a booster pump 17 is also included. The inlet of the booster pump 17 is connected to the third end of the second melt three-way valve 14, and the outlet of the booster pump 17 is connected to the pelletizer 5.

[0041] In this embodiment, specifically, the booster pump 17 pressurizes the polyester melt with the required degree of polymerization to meet the granulation requirements of the pelletizer 5.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high-efficiency preparation device for PBAT biodegradable resin, characterized in that, include: The final shrinking vessel, melt cooler, dynamic mixer, dynamic viscometer, and pelletizer are connected in sequence. The inlet of the melt cooler is connected to the chain extender mechanism, and the pipe between the dynamic mixer and the dynamic viscometer is equipped with a temperature sensor and a pressure sensor.

2. The high-efficiency preparation device for PBAT biodegradable resin according to claim 1, characterized in that, It also includes a thickening reactor, a thickening discharge pump, and a thickening discharge melt pipe. The melt cooler, the dynamic mixer, and the dynamic viscometer are arranged in sequence to form a first pipeline. The thickening reactor, the thickening discharge pump, and the thickening discharge melt pipe are arranged in sequence to form a second pipeline. The first pipeline and the second pipeline are connected in parallel.

3. The high-efficiency preparation apparatus for PBAT biodegradable resin according to claim 2, characterized in that, It also includes a first melt three-way valve and a second melt three-way valve. The first end of the first melt three-way valve is connected to the final shrinkage vessel, the second end of the first melt three-way valve is connected to the inlet of the first pipeline, the third end of the first melt three-way valve is connected to the inlet of the second pipeline, the first end of the second melt three-way valve is connected to the outlet of the first pipeline, the second end of the second melt three-way valve is connected to the outlet of the second pipeline, and the third end of the second melt three-way valve is connected to the pelletizer.

4. The high-efficiency preparation device for PBAT biodegradable resin according to claim 2, characterized in that, The thickening discharge melt pipe includes multiple straight pipe sections and multiple arc-shaped pipe sections, which are alternately connected to form a deflection flow path.

5. The high-efficiency preparation apparatus for PBAT biodegradable resin according to claim 3, characterized in that, It also includes a discharge pump and a melt filter, with the final shrinking vessel, the discharge pump, the melt filter and the first end of the first melt three-way valve connected in sequence.

6. The high-efficiency preparation apparatus for PBAT biodegradable resin according to claim 3, characterized in that, It also includes a booster pump, the inlet of which is connected to the third end of the second melt three-way valve, and the outlet of which is connected to the pelletizer.

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