A device for preparing a controllably degradable polylactic acid

Abstract

This utility model relates to a controllable degradable polylactic acid (PLA) preparation device, comprising a base plate. Above the base plate are a raw material pretreatment unit, a polymerization reaction unit, and a degradation performance control mechanism. The polymerization reaction unit includes a polymerization reactor, which is fixedly installed above the base plate and to the left of the degradation performance control mechanism. The degradation performance control mechanism includes a pump, a catalyst storage tank, a gas flow pipe, a material delivery pipe, and a metering pump. This controllable degradable PLA preparation device, through the degradation performance control mechanism, allows the pump and gas flow pipe to regulate the gas pressure inside the polymerization reactor. Pressure and temperature sensors monitor the internal pressure and temperature in real time. The catalyst storage tank and other components enable precise catalyst addition, ensuring that the degradation performance conditions of the polymerization reaction are within a precisely controllable range. This guarantees that the reaction proceeds under ideal conditions, improving the stability and consistency of the product's degradation performance.

Description

Technical Field

[0001] This utility model relates to the field of polylactic acid preparation technology, specifically to a polylactic acid preparation device with controllable degradation. Background Technology

[0002] Polylactic acid (PLA), a biodegradable thermoplastic polyester, possesses excellent biocompatibility, mechanical properties, and processing performance, making it a promising candidate for applications in packaging, medical, and agricultural fields. However, the degradation rate of PLA is influenced by various factors, such as ambient temperature, humidity, and the types of microorganisms. Existing PLA preparation equipment struggles to precisely control the degradation performance of PLA during production, resulting in PLA products being unable to accurately control their degradation time and rate according to different usage scenarios and needs in practical applications. This limits the further promotion and application of PLA products.

[0003] Currently, there are numerous products related to polylactic acid (PLA) preparation equipment. For example, Chinese patent CN202420566424.3 describes an acrylic emulsion polymerization reactor. This patent includes a reactor body with a drive mechanism fixedly connected to its top. A stirring mechanism is located inside the reactor body, and the drive mechanism and stirring mechanism are fixedly connected. The reactor body includes a reaction tank with a connection hole at its top and a discharge hole at its bottom. A conveying pipe is fixedly connected to the top of the reaction tank, located at the bottom of the discharge hole, and a valve is located at the end of the conveying pipe. The drive mechanism includes a drive unit with a drive shaft fixedly connected to its bottom. The novel acrylic emulsion polymerization reactor utilizes a scraper that adheres to and rotates on the inner wall of the reaction vessel, effectively removing material adhering to the interior. The up-and-down movement of a drive rod drives the stirring mechanism to vertically displace, achieving efficient mixing of the materials inside the reaction vessel. However, in practical use, this device, compared to traditional polylactic acid (PLA) preparation devices, often suffers from significant fluctuations in PLA degradation rates and poor product performance consistency due to insufficient precision in controlling the reaction environment or unstable catalyst dosage. Furthermore, existing equipment often lacks real-time monitoring and feedback mechanisms, making it difficult to dynamically adjust parameters based on the reaction status, thus impacting production efficiency and material utilization. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a controllable degradation polylactic acid (PLA) preparation device, which has the advantages of precisely controlling polymerization reaction conditions and improving the stability and consistency of PLA degradation performance. It solves the problems of large fluctuations in degradation rate and poor product performance consistency caused by insufficient precision in reaction environment control and unstable catalyst addition in existing devices.

[0005] To achieve the above-mentioned goal of precisely controlling polymerization reaction conditions and improving the stability and consistency of polylactic acid degradation performance, this utility model provides the following technical solution: a controllable degradation polylactic acid preparation device, including a base plate, a raw material pretreatment unit, a polymerization reaction unit and a degradation performance control mechanism are arranged above the base plate, the polymerization reaction unit includes a polymerization reactor, and the polymerization reactor is fixedly installed above the base plate and to the left of the degradation performance control mechanism;

[0006] The degradation performance control mechanism includes a pump, a catalyst storage tank, a gas fluid pipe, a material feeding pipe, and a metering pump. The pump and the catalyst storage tank are fixedly installed above the base plate. A gas fluid pipe is provided at the pumping point of the pump, and a material feeding pipe is provided at the discharge point of the catalyst storage tank. A metering pump is provided on the material feeding pipe. A pressure sensor extending into the right outer wall of the polymerization reactor is provided, and a temperature sensor extending into the front side of the polymerization reactor is provided.

[0007] Furthermore, the top of the polymerization reactor is provided with a first stirring assembly extending into it, and the top of the polymerization reactor and the left and right sides of the first stirring assembly are respectively provided with an exhaust port and an additive injection port.

[0008] Furthermore, the end of the gas fluid pipe away from the pumping unit is sealed to the exhaust port via a flange, and the end of the material delivery pipe away from the catalyst storage tank is sealed to the additive injection port via a flange.

[0009] Furthermore, the outer wall of the polymerization reactor is equipped with a heating system, which consists of a heating source, a temperature controller, a circulating pump, and heat transfer oil. A discharge pipe is provided at the bottom of the polymerization reactor.

[0010] Furthermore, the raw material pretreatment unit includes a raw material storage tank, and a second stirring assembly extending into the top of the raw material storage tank is provided therein.

[0011] Furthermore, the right inner wall of the raw material storage tank is fixedly connected to the left side of the polymerization reactor via a pipe.

[0012] Furthermore, a control console is provided above the base plate and to the right of the degradation performance control mechanism.

[0013] Furthermore, the polymerization reactor is a closed container with a double-layer jacket structure.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] 1. This controllable degradable polylactic acid (PLA) preparation device, through the establishment of a degradation performance regulation mechanism, includes a pump and gas flow pipe to regulate the gas pressure inside the polymerization reactor, pressure and temperature sensors to monitor the internal pressure and temperature in real time, and a catalyst storage tank, material delivery pipe, and metering pump to precisely add catalyst. This ensures that the degradation performance-related conditions of the polymerization reaction are within a precisely controllable range, guaranteeing that the reaction proceeds under ideal conditions and improving the stability and consistency of the product's degradation performance. In addition, the coordinated operation of these components can stably control the reaction environment, avoiding the impact of large fluctuations in pressure and temperature or uneven catalyst addition on the reaction. This allows the polymerization reaction to proceed continuously and efficiently, helping to improve production efficiency and reduce material waste caused by abnormal reactions. From the perspective of equipment operation, this provides support for obtaining high-quality products with good degradation performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a front sectional view of the structure of this utility model;

[0018] Figure 3 This is a partial front sectional view of the structure of this utility model.

[0019] In the diagram: 1. Base plate; 2. Polymerization reactor; 3. First stirring assembly; 4. Exhaust port; 5. Additive injection port; 6. Degradation performance control mechanism; 601. Pumping press; 602. Catalyst storage tank; 603. Gas flow pipe; 604. Material feeding pipe; 605. Metering pump; 7. Heating system; 8. Raw material storage tank; 9. Second stirring assembly; 10. Discharge pipe; 11. Control console. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-3 The controllable degradation polylactic acid preparation device in this embodiment includes a base plate 1. A raw material pretreatment unit, a polymerization reaction unit, and a degradation performance control mechanism 6 are arranged above the base plate 1. The polymerization reaction unit includes a polymerization reactor 2, which is a closed container with a double-layer jacket structure. The polymerization reactor 2 is fixedly installed above the base plate 1 and to the left of the degradation performance control mechanism 6.

[0022] The degradation performance control mechanism 6 includes a pump 601, a catalyst storage tank 602, a gas fluid pipe 603, a material delivery pipe 604, and a metering pump 605. The pump 601 and the catalyst storage tank 602 are fixedly installed above the base plate 1. The pump 601 has a gas fluid pipe 603 at its pumping point, and the catalyst storage tank 602 has a material delivery pipe 604 at its discharge point. An exhaust port 4 and an additive injection port 5 are respectively located on the top of the polymerization reactor 2 and on the left and right sides of the first stirring assembly 3. The end of the gas fluid pipe 603 away from the pump 601 is sealed to the exhaust port 4 via a flange. The end of the material delivery pipe 604 away from the catalyst storage tank 602 is sealed to the additive injection port 5 via a flange. A metering pump 605 is installed on the material delivery pipe 604. A pressure sensor 605 extending into the right outer wall of the polymerization reactor 2 is installed. 6. A temperature sensor 607 extending into the front of the polymerization reactor 2 is installed. The pump 601 and gas flow pipe 603 can regulate the gas pressure inside the polymerization reactor 2. The pressure sensor 606 and temperature sensor 607 can monitor the internal pressure and temperature in real time. The catalyst storage tank 602, material delivery pipe 604 and metering pump 605 can accurately add catalyst, so that the conditions related to the degradation performance of the polymerization reaction are within a precise and controllable range, ensuring that the reaction proceeds in an ideal state, improving the stability and consistency of the degradation performance of the product. In addition, the cooperation of various components can stably control the reaction environment, avoiding the impact of large fluctuations in pressure and temperature or uneven catalyst addition on the reaction, so that the polymerization reaction can be carried out continuously and efficiently, which helps to improve production efficiency and reduce material waste caused by abnormal reaction. From the perspective of equipment operation, it provides support for obtaining high-quality products with good degradation performance.

[0023] In the implementation of the case, the top of the polymerization reactor 2 is provided with a first stirring component 3 extending into its interior. This design is similar to the drive mechanism and stirring mechanism in the comparative case, and is used to stir the material inside the polymerization reactor 2 while avoiding the material sticking to the inner wall.

[0024] In the implementation of the case, the outer wall of the polymerization reactor 2 is equipped with a heating system 7, which consists of a heating source, a temperature controller and a circulating pump. The temperature controller can control the power of the heating source and the flow rate of the circulating pump according to the set temperature curve, so that the temperature inside the reactor is maintained within the set range. The circulating pump is used to drive the heat transfer oil to circulate in the double jacket of the polymerization reactor 2, so that the reaction temperature is uniform and controllable. The bottom of the polymerization reactor 2 is equipped with a discharge pipe 10 for discharging the processed material.

[0025] In the implementation of the case, the raw material pretreatment unit includes a raw material storage tank 8. A second stirring component 9 extending into the top of the raw material storage tank 8 is provided. The raw material storage tank 8 is used to store lactic acid monomers and other additives, while the second stirring component 9 is used to fully stir and mix the raw materials to ensure that the components are evenly distributed. The right inner wall of the raw material storage tank 8 is fixedly connected to the left side of the polymerization reactor 2 through a pipeline. This connection method can conveniently and automatically transport the raw materials in the raw material storage tank 8 to the polymerization reactor 2 through the pipeline, reducing the manual handling of raw materials and improving the continuity and automation of production.

[0026] In the implementation of the case, a control console 11 is set above the base plate 1 and to the right of the degradation performance control mechanism 6. The control console integrates a display module for a pressure sensor 606 and a temperature sensor 607, as well as control buttons for a pump 601 and a metering pump 605. It is also electrically connected to the electronic components in this patent through wires, thereby realizing the function of parameter monitoring and equipment control.

[0027] When implementing this procedure, please follow these steps:

[0028] 1) First, add lactic acid monomer and additives to raw material storage tank 8, start the second stirring component 9 to stir, so that the raw materials are mixed evenly, and then transport the mixed raw materials to polymerization reactor 2 through pipeline;

[0029] 2) Then close the sealing cover of the polymerization reactor 2, start the heating system 7, set the temperature rise curve through the temperature controller, and start the first stirring component 3 at the same time;

[0030] 3) Real-time monitoring of pressure sensor 606 and temperature sensor 607 data. When the pressure inside the reactor exceeds the limit threshold, start pumping press 601 to exhaust gas and reduce pressure through gas fluid pipe 603. According to the reaction process, inject catalyst from catalyst storage tank 602 into polymerization reactor 2 through material delivery pipe 604 at a specified rate via metering pump 605.

[0031] 4) After the final reaction is completed, turn off the heating system 7 and wait for the material to cool to the normal temperature before opening the discharge pipe 10 to discharge the polylactic acid product.

[0032] In summary, this controllable degradable polylactic acid (PLA) preparation device, through the inclusion of a degradation performance regulation mechanism 6, includes a pump 601 and a gas flow pipe 603 to regulate the gas pressure inside the polymerization reactor 2; a pressure sensor 606 and a temperature sensor 607 to monitor the internal pressure and temperature in real time; and a catalyst storage tank 602, a material delivery pipe 604, and a metering pump 605 to precisely add the catalyst. This ensures that the degradation performance conditions of the polymerization reaction are within a precisely controllable range, guaranteeing that the reaction proceeds under ideal conditions and improving the stability and consistency of the product's degradation performance. Furthermore, the coordinated operation of these components stabilizes the reaction environment, preventing significant fluctuations in pressure and temperature or uneven catalyst addition from affecting the reaction. This allows the polymerization reaction to proceed continuously and efficiently, improving production efficiency and reducing material waste caused by reaction anomalies. From an equipment operation perspective, this provides support for obtaining high-quality products with good degradation performance and solves the problem of…

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A controllable degradable polylactic acid preparation apparatus, comprising a base plate (1), characterized in that: A raw material pretreatment unit, a polymerization reaction unit, and a degradation performance control mechanism (6) are provided above the base plate (1). The polymerization reaction unit includes a polymerization reactor (2). The polymerization reactor (2) is fixedly installed above the base plate (1) and to the left of the degradation performance control mechanism (6). The degradation performance control mechanism (6) includes a pump (601), a catalyst storage tank (602), a gas fluid pipe (603), a material feeding pipe (604), and a metering pump (605). The pump (601) and the catalyst storage tank (602) are fixedly installed above the base plate (1). The pump (601) is equipped with a gas fluid pipe (603) at the pumping point. The catalyst storage tank (602) is equipped with a material feeding pipe (604) at the discharge point. The material feeding pipe (604) is equipped with a metering pump (605). The right outer wall of the polymerization reactor (2) is equipped with a pressure sensor (606) extending into its interior. The front side of the polymerization reactor (2) is equipped with a temperature sensor (607) extending into its interior.

2. The apparatus for preparing controllable degradable polylactic acid according to claim 1, characterized in that: The top of the polymerization reactor (2) is provided with a first stirring component (3) extending into its interior. The top of the polymerization reactor (2) and the left and right sides of the first stirring component (3) are respectively provided with an exhaust port (4) and an additive injection port (5).

3. The apparatus for preparing controllable degradable polylactic acid according to claim 2, characterized in that: The gas fluid pipe (603) is connected to the exhaust port (4) by a flange seal at the end away from the pump (601), and the material delivery pipe (604) is connected to the additive injection port (5) by a flange seal at the end away from the catalyst storage tank (602).

4. The apparatus for preparing controllable degradable polylactic acid according to claim 2, characterized in that: The outer wall of the polymerization reactor (2) is provided with a heating system (7), which consists of a heating source, a temperature controller, a circulating pump and heat transfer oil. The bottom of the polymerization reactor (2) is provided with a discharge pipe (10).

5. The apparatus for preparing controllable degradable polylactic acid according to claim 1, characterized in that: The raw material pretreatment unit includes a raw material storage tank (8), and a second stirring assembly (9) extending into the top of the raw material storage tank (8).

6. The apparatus for preparing controllable degradable polylactic acid according to claim 5, characterized in that: The right inner wall of the raw material storage tank (8) is fixedly connected to the left side of the polymerization reactor (2) via a pipe.

7. The apparatus for preparing controllable degradable polylactic acid according to claim 1, characterized in that: A control console (11) is provided above the base plate (1) and to the right of the degradation performance control mechanism (6).

8. The apparatus for preparing controllable degradable polylactic acid according to claim 4, characterized in that: The polymerization reactor (2) is a closed container with a double-layer jacket structure.

Images