PBAT online tackifying supercritical gas foaming system and foaming method

Abstract

The invention relates to the technical field of plastic product preparation, and discloses a PBAT online tackifying supercritical gas foaming system and foaming method.The system comprises a dynamic mixer used for mixing and stirring plastic melt, a chain extender and supercritical gas; the gas pressurization module is used for pressurizing gas guided from the gas source to supercritical gas, the gas pressurization module is further used for guiding the supercritical gas to the dynamic mixer, and the material module is used for conveying plastic melt to the dynamic mixer. The tackifier module is used for conveying a chain extender to the dynamic mixer and is provided with a fluid metering unit, and the fluid metering unit is used for detecting the conveying amount of the chain extender. And the control module is used for controlling the gas pressurization module, the material module and the tackifier module. Through cooperation of the dynamic mixer, the gas pressurization module, the material module, the tackifier module and the control module, efficient production of PBAT online tackifying supercritical gas foaming is effectively achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic product preparation, and in particular to a PBAT online viscosity-enhancing supercritical gas foaming system and a foaming method. Background Art

[0002] PBAT (polybutylene adipate / terephthalate) is an environmentally friendly and biodegradable plastic that is increasingly used in modern society. Especially in the field of disposable plastic products, PBAT has become an important alternative to traditional plastics due to its good biodegradability and environmental friendliness.

[0003] The foaming processing technology of PBAT has always faced challenges in the industry, which limits its wide application in more fields. During the foaming process, PBAT needs to reach a certain melt index to effectively encapsulate the gas. However, the PBAT raw material products currently on the market often cannot meet this requirement. Therefore, when manufacturers produce film products, they have to adopt the treatment method of re-melting and chain extension and viscosity increase of PBAT raw materials to reduce its melt index and then prepare thin films. This treatment method not only reduces production efficiency, but also increases production time and cost, which imposes certain restrictions on the application of PBAT.

[0004] Therefore, it is urgent to invent a PBAT foaming technology to solve the problems of low production efficiency, long production time and high production cost when preparing PBAT films in the current technology. Summary of the invention

[0005] In view of this, the present invention proposes a PBAT online thickening supercritical gas foaming system and foaming method, aiming to solve the problems of low production efficiency, long production time and high production cost when preparing PBAT films in the current technology.

[0006] The present invention proposes a PBAT online viscosity increasing supercritical gas foaming system, comprising:

[0007] A dynamic mixer is used to mix and stir the plastic melt, chain extender and supercritical gas;

[0008] A gas pressurizing module, one end of which is connected to a gas source, and the other end of which is connected to the dynamic mixer, wherein the gas pressurizing module is used to pressurize the gas diverted from the gas source to the supercritical gas, and the gas pressurizing module is also used to divert the supercritical gas to the dynamic mixer, wherein the gas pressurizing module is also provided with a gas metering unit, and the gas metering unit is used to detect the diversion amount of the supercritical gas;

[0009] A material module, connected to the dynamic mixer, and used for conveying the plastic melt to the dynamic mixer;

[0010] a tackifier module, connected to the dynamic mixer, and used to deliver the chain extender to the dynamic mixer, wherein the tackifier module is provided with a fluid metering unit, and the fluid metering unit is used to detect the delivery amount of the chain extender;

[0011] The control module is electrically connected to the dynamic mixer, the gas booster module, the material module and the viscosity enhancer module respectively, and the control module is used to control the gas booster module, the material module and the viscosity enhancer module.

[0012] Furthermore, the material module includes:

[0013] A metering pump, connected to the dynamic mixer, and used to pump the plastic melt into the dynamic mixer;

[0014] A pressure detection unit is disposed between the metering pump and the dynamic mixer, and is used to detect the pressure between the metering pump and the dynamic mixer.

[0015] Furthermore, the control module includes:

[0016] A collection unit is electrically connected to the gas metering unit, the fluid metering unit, the metering pump and the pressure detection unit, and is used to collect the supercritical gas conductance, the delivery amount of the chain extender, the pressure between the metering pump and the dynamic mixer, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer;

[0017] The central control unit is electrically connected to the collection unit, the gas booster module, the viscosity enhancer module and the metering pump, respectively. The central control unit is used to adjust the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer. The central control unit is also used to adjust the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount.

[0018] Furthermore, the central control unit is used to adjust the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer, including:

[0019] The central control unit is also used to obtain the real-time pressure between the metering pump and the dynamic mixer, and compare the real-time pressure with the preset pressure, and determine the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer according to the comparison result, wherein;

[0020] When the real-time pressure is equal to the preset pressure, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when being pumped into the dynamic mixer is M0;

[0021] When the real-time pressure is less than the preset pressure, the central control unit obtains the pressure difference between the real-time pressure and the preset pressure, and determines the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure difference.

[0022] Furthermore, when the central control unit determines the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure difference, it includes:

[0023] The central control unit is configured with a first preset pressure difference and a second preset pressure difference, and the first preset pressure difference is smaller than the second preset pressure difference;

[0024] The central control unit is also used to determine the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the relationship between the pressure difference and each preset pressure difference, wherein:

[0025] When the pressure difference is less than or equal to the first preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when being pumped into the dynamic mixer is M1;

[0026] When the pressure difference is less than or equal to the second preset pressure difference, and the pressure difference is greater than the first preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when pumped into the dynamic mixer is M2;

[0027] When the pressure difference is greater than the second preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when being pumped into the dynamic mixer is M3;

[0028] Moreover, M0<M1<M2<M3.

[0029] Furthermore, the central control unit is also used to adjust the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount, including:

[0030] The central control unit is further used to determine the adjustment coefficient of the supercritical gas conductance and the delivery amount of the chain extender according to the relationship between the pumping amount and the preset pumping amount, wherein:

[0031] When the pumping amount is consistent with the preset pumping amount, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N0, and the adjustment coefficient of the chain extender delivery amount is B0;

[0032] When the pumping amount is inconsistent with the preset pumping amount, the central control unit obtains the pumping amount ratio between the pumping amount and the preset pumping amount, and determines the adjustment coefficient of the supercritical gas conductance and the chain extender delivery amount according to the pumping amount ratio.

[0033] Furthermore, when the central control unit determines the adjustment coefficient of the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount ratio, it includes:

[0034] The central control unit is also configured with a first preset pumping volume ratio and a second preset pumping volume ratio, and the first preset pumping volume ratio is smaller than the second preset pumping volume ratio;

[0035] The central control unit is also used to determine the adjustment coefficient of the supercritical gas conductance and the delivery amount of the chain extender according to the relationship between the pumping amount ratio and each preset pumping amount ratio, wherein;

[0036] When the pumping amount ratio is less than or equal to the first preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N1, and the adjustment coefficient of the chain extender delivery amount is B1;

[0037] When the pumping amount ratio is less than or equal to the second preset pumping amount ratio, and the pumping amount is greater than the first preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N2, and the adjustment coefficient of the chain extender delivery amount is B2;

[0038] When the pumping amount ratio is greater than the second preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N3, and the adjustment coefficient of the chain extender delivery amount is B3;

[0039] Moreover, N0<N1<N2<N3; B0<B1<B2<B3.

[0040] Furthermore, the dynamic mixer is also provided with a driving motor and a uniformity adjustment module, wherein:

[0041] The driving motor is connected to the stirring shaft of the dynamic mixer, and the driving motor is used to drive the rotation of the stirring shaft;

[0042] The uniformity adjustment module is arranged at the extrusion port of the dynamic mixer, and the uniformity adjustment module is electrically connected to the drive motor. The uniformity adjustment module is used to detect the uniformity of the material mixing after mixing and stirring inside the dynamic mixer, and to correct the driving speed of the drive motor according to the uniformity of the material mixing.

[0043] Furthermore, the uniformity adjustment module, when correcting the driving speed of the driving motor according to the uniformity of the material mixing, includes:

[0044] The uniformity adjustment module is also used to obtain the uniformity difference between the real-time uniformity of the material mixing and the preset uniformity;

[0045] The uniformity adjustment module is further configured with a first preset uniformity difference value and a second preset uniformity difference value, wherein the first preset uniformity difference value is smaller than the second preset uniformity difference value, and the first preset uniformity difference value is smaller than 0;

[0046] The uniformity adjustment module is further used to determine a correction coefficient of the driving speed according to a relationship between the uniformity difference and each preset uniformity difference;

[0047] When the uniformity difference is less than or equal to the first preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K3;

[0048] When the uniformity difference is equal to 0 and the uniformity difference is greater than the first preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K0;

[0049] When the uniformity difference is greater than 0 and the uniformity difference is less than or equal to the second preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K2;

[0050] When the uniformity difference is greater than the second preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K1;

[0051] Moreover, K1<K0<K2<K3.

[0052] Compared with the prior art, the beneficial effect of the present invention is that the plastic melt, chain extender and supercritical gas are mixed and stirred by a dynamic mixer, thereby realizing the integrated processing of chain extension, viscosity enhancement and gas foaming. Such an integrated design greatly simplifies the production process, improves production efficiency, and also reduces production costs. Secondly, by adopting a gas booster module, the gas in the gas source can be pressurized to a supercritical state and directed to the dynamic mixer. This design helps to improve the solubility and diffusivity of the gas, so that the gas can be more fully dissolved in the plastic melt, thereby achieving better foaming effect and foam quality. In addition, the material module and the viscosity enhancer module are respectively used to convey the plastic melt and the chain extender to the dynamic mixer, wherein the viscosity enhancer module is also equipped with a fluid metering unit, which can accurately detect the delivery amount of the chain extender. Such a design can ensure that the amount of chain extender used is accurately controlled, thereby realizing the precise regulation of the PBAT melt and improving the stability and consistency of production. Finally, by equipping a control module, the dynamic mixer, gas booster module, material module and viscosity enhancer module can be fully controlled. Through the control module, operators can monitor and adjust the entire production process in real time to ensure stable production operation and the production of high-quality products.

[0053] On the other hand, the present application also provides a PBAT online viscosity increasing supercritical gas foaming method, comprising:

[0054] Obtain the supercritical gas conductance, the delivery amount of the chain extender, the pressure between the metering pump and the dynamic mixer, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer;

[0055] adjusting the amount of the plastic melt pumped into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer;

[0056] adjusting the supercritical gas conductance and the chain extender delivery amount according to the pumping amount;

[0057] The uniformity difference of the materials after mixing and stirring in the dynamic mixer is obtained, and the stirring speed during stirring is corrected according to the uniformity difference of the material mixing.

[0058] It can be understood that the PBAT online viscosity increasing supercritical gas foaming system and foaming method in each embodiment of the present invention have the same beneficial effects and will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0060] Figure 1 A schematic structural diagram of a PBAT online viscosity increasing supercritical gas foaming system provided in an embodiment of the present invention.

[0061] Figure 2 This is a structural block diagram of a control module provided in an embodiment of the present invention.

[0062] Figure 3 A flowchart of a PBAT online viscosity increasing supercritical gas foaming method provided in an embodiment of the present invention.

[0063] Among them, 1. dynamic mixer; 2. gas booster module; 21. gas metering unit; 31. metering pump; 32. pressure detection unit; 4. thickener module; 41. fluid metering unit; 5. gas source. DETAILED DESCRIPTION

[0064] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0065] like Figure 1As shown, in some embodiments of the present application, this embodiment provides a PBAT online thickening supercritical gas foaming system, including: a dynamic mixer 1, a gas boosting module 2, a material module, a thickener module 4 and a control module. The dynamic mixer 1 is used to mix and stir the plastic melt, the chain extender and the supercritical gas. One end of the gas boosting module 2 is connected to the gas source 5, and the other end of the gas boosting module 2 is connected to the dynamic mixer 1. The gas boosting module 2 is used to pressurize the gas diverted from the gas source 5 to the supercritical gas. The gas boosting module 2 is also used to divert the supercritical gas to the dynamic mixer 1, wherein the gas boosting module 2 is also provided with a gas metering unit 21, and the gas metering unit 21 is used to detect the supercritical gas diversion amount. The material module is connected to the dynamic mixer 1, and the material module is used to transport the plastic melt to the dynamic mixer 1. The tackifier module 4 is connected to the dynamic mixer 1, and is used to deliver the chain extender to the dynamic mixer 1, wherein the tackifier module 4 is provided with a fluid metering unit 41, and the fluid metering unit 41 is used to detect the delivery amount of the chain extender. The control module is electrically connected to the dynamic mixer 1, the gas booster module 2, the material module and the tackifier module 4, respectively, and the control module is used to control the gas booster module 2, the material module and the tackifier module 4.

[0066] It can be understood that, firstly, the dynamic mixer 1 achieves uniform dispersion and dissolution of the materials by fully mixing and stirring the plastic melt, the chain extender and the supercritical gas. Secondly, the function of the gas boosting module 2 is to boost the gas in the gas source 5 to a supercritical state and guide it to the dynamic mixer 1. This process requires precise control and regulation to ensure that the gas boosting process meets the predetermined parameter requirements, such as pressure, flow, etc. The gas metering unit 21 in the gas boosting module 2 plays an important role in monitoring and regulating the gas diversion amount, ensuring the stability and controllability of the foaming process. At the same time, the material module and the viscosity enhancer module 4 are responsible for conveying the plastic melt and the chain extender to the dynamic mixer 1 respectively. The material module conveys the plastic melt from the storage container to the mixer through a specific conveying device. The viscosity enhancer module 4 conveys the chain extender from the storage container to the mixer in a similar manner. These conveying processes need to ensure the stable conveying and accurate metering of the materials to ensure the stability and consistency of the foaming process. Finally, the control module connects the key modules and comprehensively controls the gas booster module 2, the material module and the viscosity enhancer module 4. The control system in the control module can monitor the changes of various parameters in real time, and adjust and optimize the system to ensure the stability and production efficiency of the foaming process. In addition, the control module can also record and analyze production data to provide a reference for the optimization and improvement of the production process.

[0067] In some embodiments of the present application, the material module includes: a metering pump 31 and a pressure detection unit 32, the metering pump 31 is connected to the dynamic mixer 1, and the metering pump 31 is used to pump the plastic melt into the dynamic mixer 1. The pressure detection unit 32 is arranged between the metering pump 31 and the dynamic mixer 1, and the pressure detection unit 32 is used to detect the pressure between the metering pump 31 and the dynamic mixer 1.

[0068] See also Figure 2 As shown, in some embodiments of the present application, the control module includes: a collection unit and a central control unit. The collection unit is electrically connected to the gas metering unit 21, the fluid metering unit 41, the metering pump 31 and the pressure detection unit 32 respectively, and the collection unit is used to collect the supercritical gas conductance, the delivery amount of the chain extender, the pressure between the metering pump 31 and the dynamic mixer 1, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1. The central control unit is electrically connected to the collection unit, the gas booster module 2, the viscosity enhancer module 4 and the metering pump 31 respectively, and the central control unit is used to adjust the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 according to the pressure between the metering pump 31 and the dynamic mixer 1. The central control unit is also used to adjust the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount.

[0069] Specifically, first, the acquisition unit is electrically connected to the gas metering unit 21, the fluid metering unit 41, the metering pump 31 and the pressure detection unit 32, and is mainly used to collect key parameters such as supercritical gas conductivity, chain extender delivery, pressure between the metering pump 31 and the dynamic mixer 1, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 in real time. Through the acquisition unit, the system can monitor the changes of these key parameters in real time, providing an accurate data basis for subsequent control. Secondly, the central control unit is electrically connected to the acquisition unit, the gas booster module 2, the viscosity enhancer module 4 and the metering pump 31, and undertakes the task of real-time control and adjustment of the system according to the collected data. The central control unit adjusts the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 according to the pressure between the metering pump 31 and the dynamic mixer 1 to maintain the stability of the pumping amount. At the same time, according to the changes in the pumping amount, the central control unit can also adjust the supercritical gas conductivity and the delivery amount of the chain extender, so as to maintain the balance and stability of the system.

[0070] It can be seen that the control module collects and monitors the changes in key parameters in the system, and adjusts the operating status of each module in real time based on these data to ensure that the foaming process of the PBAT online viscosity-increasing supercritical gas foaming system is stable, efficient and controllable. This intelligent control method improves the automation and production efficiency of the system and provides a reliable technical guarantee for the production of environmentally friendly and degradable plastic products.

[0071] In some embodiments of the present application, when the central control unit is used to adjust the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 according to the pressure between the metering pump 31 and the dynamic mixer 1, it includes: the central control unit is also used to obtain the real-time pressure between the metering pump 31 and the dynamic mixer 1, and compare the real-time pressure with the preset pressure, and determine the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 according to the comparison result, wherein: when the real-time pressure is equal to the preset pressure, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 is M0. When the real-time pressure is less than the preset pressure, the central control unit obtains the pressure difference between the real-time pressure and the preset pressure, and determines the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer 1 according to the pressure difference.

[0072] In some embodiments of the present application, when the central control unit determines the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer 1 according to the pressure difference, it includes: the central control unit is configured with a first preset pressure difference and a second preset pressure difference, and the first preset pressure difference is less than the second preset pressure difference. The central control unit is also used to determine the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer 1 according to the relationship between the pressure difference and each preset pressure difference, wherein: when the pressure difference is less than or equal to the first preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer 1 is M1. When the pressure difference is less than or equal to the second preset pressure difference, and the pressure difference is greater than the first preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer 1 is M2. When the pressure difference is greater than the second preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer 1 is M3. And, M0<M1<M2<M3.

[0073] Specifically, the central control unit obtains the real-time pressure and compares it with the preset pressure, and then determines the adjustment coefficient of the plastic melt pumping amount according to the comparison result, thereby realizing the control of the foaming process. First, the central control unit divides the difference between the real-time pressure and the preset pressure into three intervals through the configured preset pressure difference: less than the first preset pressure difference, between the first and second preset pressure differences, and greater than the second preset pressure difference. Such a division helps to take different adjustment measures according to different pressure difference conditions. Secondly, according to the relationship between the pressure difference and each preset pressure difference, the central control unit determines the adjustment coefficient of the plastic melt pumping amount. When the pressure difference is less than or equal to the first preset pressure difference, the central control unit determines a smaller adjustment coefficient M1 for fine-tuning the pumping amount to maintain the stability of the system. When the pressure difference is between the first and second preset pressure differences, the central control unit determines a larger adjustment coefficient M2 to adjust the pumping amount more quickly to adapt to pressure changes. When the pressure difference is greater than the second preset pressure difference, the central control unit determines a maximum adjustment coefficient M3 for quickly adjusting the pumping amount to quickly respond to pressure changes. Finally, according to the setting of the adjustment coefficient, the central control unit ensures that the relationship of M0<M1<M2<M3 is established to ensure the incrementality and rationality of the adjustment coefficient. This design can effectively realize the dynamic adjustment of the plastic melt pumping amount to maintain the stability of the foaming process and the consistency of production.

[0074] Specifically, first, the dynamic mixer 1 obtains the pressure change during the foaming process in real time by monitoring the pressure between the metering pump 31 and the dynamic mixer 1. This real-time monitoring enables the system to respond to pressure changes in a timely manner. Secondly, when it is monitored that the pressure between the metering pump 31 and the dynamic mixer 1 exceeds the preset range or needs to be adjusted, the dynamic mixer 1 changes the delivery amount of the plastic melt by adjusting the pumping amount. Increasing the pumping amount can increase the flow speed and amount of the plastic melt, thereby increasing the contact area with the mixed gas, and then adjusting the pressure. Then, as the pumping amount increases, the plastic melt and the mixed gas are fully mixed, so that the pressure in the dynamic mixer 1 gradually tends to be stable. By adjusting the pumping amount, the system can effectively control the pressure between the metering pump 31 and the dynamic mixer 1 and keep it within a suitable range. Finally, the dynamic mixer 1 adjusts the size of the pumping amount according to the pressure situation monitored in real time, so that the pressure between the metering pump 31 and the dynamic mixer 1 is maintained at a stable level. Such an adjustment process can ensure the stability and consistency of the foaming process and provide technical support for the production of high-quality foam plastic products.

[0075] In some embodiments of the present application, the central control unit is also used to adjust the supercritical gas conductivity and the delivery amount of the chain extender according to the pumping amount, including: the central control unit is also used to determine the adjustment coefficient of the supercritical gas conductivity and the delivery amount of the chain extender according to the relationship between the pumping amount and the preset pumping amount, wherein: when the pumping amount is consistent with the preset pumping amount, the central control unit determines the adjustment coefficient of the supercritical gas conductivity as N0 and the adjustment coefficient of the delivery amount of the chain extender as B0. When the pumping amount is inconsistent with the preset pumping amount, the central control unit obtains the pumping amount ratio between the pumping amount and the preset pumping amount, and determines the adjustment coefficient of the supercritical gas conductivity and the delivery amount of the chain extender according to the pumping amount ratio.

[0076] In some embodiments of the present application, when the central control unit determines the adjustment coefficient of the supercritical gas conductivity and the delivery amount of the chain extender according to the pumping amount ratio, it includes: the central control unit is also configured with a first preset pumping amount ratio and a second preset pumping amount ratio, and the first preset pumping amount ratio is less than the second preset pumping amount ratio. The central control unit is also used to determine the adjustment coefficient of the supercritical gas conductivity and the delivery amount of the chain extender according to the relationship between the pumping amount ratio and each preset pumping amount ratio, wherein: when the pumping amount ratio is less than or equal to the first preset pumping amount ratio, the central control unit determines the adjustment coefficient of the supercritical gas conductivity to be N1, and the adjustment coefficient of the delivery amount of the chain extender to be B1. When the pumping amount ratio is less than or equal to the second preset pumping amount ratio, and the pumping amount is greater than the first preset pumping amount ratio, the central control unit determines the adjustment coefficient of the supercritical gas conductivity to be N2, and the adjustment coefficient of the delivery amount of the chain extender to be B2. When the pumping amount ratio is greater than the second preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N3, and the adjustment coefficient of the chain extender delivery amount is B3. And, N0<N1<N2<N3. B0<B1<B2<B3.

[0077] Specifically, first, the central control unit determines the adjustment coefficient of the supercritical gas conductivity and the chain extender delivery amount according to the relationship between the pumping amount and the preset pumping amount. If the pumping amount is consistent with the preset pumping amount, the central control unit determines the adjustment coefficients of the supercritical gas conductivity and the chain extender delivery amount as N0 and B0, respectively. Such a setting ensures that when the pumping amount is stable, the supercritical gas conductivity and the chain extender delivery amount also remain in a stable state. Secondly, when the pumping amount is inconsistent with the preset pumping amount, the central control unit obtains the pumping amount ratio between the pumping amount and the preset pumping amount, and determines the adjustment coefficient of the supercritical gas conductivity and the chain extender delivery amount according to the pumping amount ratio. The determination of this adjustment coefficient can be dynamically adjusted according to the changes in the actual pumping amount to ensure that the supercritical gas conductivity and the chain extender delivery amount can respond to the changes in the pumping amount in a timely and accurate manner. Next, the central control unit divides the pumping volume ratio into three intervals according to the configured first preset pumping volume ratio and the second preset pumping volume ratio: less than the first preset pumping volume ratio, between the first and second preset pumping volume ratios, and greater than the second preset pumping volume ratio. Such a division helps to take different adjustment measures according to different pumping volume ratios. Finally, according to the relationship between the pumping volume ratio and each preset pumping volume ratio, the central control unit determines the adjustment coefficient of the supercritical gas conductivity and the delivery amount of the chain extender. For example, when the pumping volume ratio is less than or equal to the first preset pumping volume ratio, the central control unit determines a smaller adjustment coefficient N1 and B1 for fine-tuning the supercritical gas conductivity and the delivery amount of the chain extender to maintain the stability of the system. Similarly, according to the change of the pumping volume ratio, different adjustment coefficients N2, N3, B2 and B3 are determined to ensure that the supercritical gas conductivity and the delivery amount of the chain extender can respond to the change of the pumping volume in a timely and accurate manner.

[0078] It can be seen that the central control unit dynamically adjusts the supercritical gas conductance and chain extender delivery according to the relationship between the pumping volume and the preset pumping volume, thereby achieving precise control of the foaming process. This technical principle can effectively cope with different changes in pumping volume and ensure the stability and consistency of the ratio between the materials in the foaming process.

[0079] In some embodiments of the present application, the dynamic mixer is also provided with a driving motor and a uniformity adjustment module, wherein: the driving motor and the uniformity adjustment module, the driving motor is connected to the stirring shaft of the dynamic mixer 1, and the driving motor is used to drive the rotation of the stirring shaft; the uniformity adjustment module is arranged at the extrusion port of the dynamic mixer, and the uniformity adjustment module is electrically connected to the driving motor, and the uniformity adjustment module is used to detect the uniformity of the material mixing after mixing and stirring inside the dynamic mixer 1, and correct the driving speed of the driving motor according to the uniformity of the material mixing.

[0080] In some embodiments of the present application, when the uniformity adjustment module corrects the driving speed of the driving motor according to the uniformity of the material mixing, it includes: the uniformity adjustment module is also used to obtain the uniformity difference between the real-time uniformity of the material mixing and the preset uniformity; the uniformity adjustment module is also configured with a first preset uniformity difference and a second preset uniformity difference, wherein the first preset uniformity difference is less than the second preset uniformity difference, and the first preset uniformity difference is less than 0. The uniformity adjustment module is also used to determine the correction coefficient of the driving speed according to the relationship between the uniformity difference and each preset uniformity difference: when the uniformity difference is less than or equal to the first preset uniformity difference, the uniformity adjustment module determines that the correction coefficient of the driving speed is K3. When the uniformity difference is equal to 0 and the uniformity difference is greater than the first preset uniformity difference, the uniformity adjustment module determines that the correction coefficient of the driving speed is K0. When the uniformity difference is greater than 0 and the uniformity difference is less than or equal to the second preset uniformity difference, the uniformity adjustment module determines that the correction coefficient of the driving speed is K2. When the uniformity difference is greater than the second preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K1. Moreover, K1<K0<K2<K3.

[0081] Specifically, first, the uniformity adjustment module is configured with a preset material uniformity, which can obtain the uniformity of the material after mixing and stirring in the dynamic mixer 1, and compare it with the preset uniformity to obtain the uniformity difference. Such a configuration enables the system to monitor the uniformity changes of the material in real time. Secondly, the uniformity adjustment module determines the correction coefficient of the driving speed according to the relationship between the uniformity difference and the preset uniformity difference. Here, by configuring the first preset uniformity difference and the second preset uniformity difference, the uniformity difference is divided into three intervals: less than the first preset uniformity difference, between the first and second preset uniformity differences, and greater than the second preset uniformity difference. Such a division helps to take different adjustment measures according to different uniformity difference situations. Then, according to the relationship between the uniformity difference and each preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed. For example, when the uniformity difference is less than or equal to the first preset uniformity difference, a larger correction coefficient K3 is determined to speed up the driving speed to increase the stirring intensity, thereby increasing the uniformity of the material. Similarly, according to the change of uniformity difference, different correction coefficients K0, K1 and K2 are determined to ensure that the adjustment of the drive speed can respond to the change of material uniformity in a timely and accurate manner. Finally, the relationship of K1<K0<K2<K3 is ensured. Such a setting can ensure that different adjustment measures are taken under different uniformity differences and ensure the gradualness and rationality of the adjustment.

[0082] It is understandable that the uniformity adjustment module in the dynamic mixer 1 dynamically adjusts the driving speed of the driving motor according to the difference between the real-time monitored material uniformity and the preset uniformity, so as to achieve precise control of the uniformity of the foam plastic product. Further, it can effectively respond to different uniformity requirements and ensure the stability and consistency of the quality of the prepared product.

[0083] In the above embodiment, the plastic melt, the chain extender and the supercritical gas are mixed and stirred by the dynamic mixer 1, so as to realize the integrated processing of chain extension, viscosity enhancement and gas foaming. Such an integrated design greatly simplifies the production process, improves production efficiency, and also reduces production costs. Secondly, by adopting the gas booster module 2, the gas in the gas source 5 can be pressurized to a supercritical state and directed to the dynamic mixer 1. This design helps to improve the solubility and diffusivity of the gas, so that the gas can be more fully dissolved in the plastic melt, thereby achieving better foaming effect and foam quality. In addition, the material module and the viscosity enhancer module 4 are respectively used to convey the plastic melt and the chain extender to the dynamic mixer 1, wherein the viscosity enhancer module 4 is also equipped with a fluid metering unit 41, which can accurately detect the delivery amount of the chain extender. Such a design can ensure that the amount of chain extender used is accurately controlled, thereby realizing the precise regulation of the PBAT melt and improving the stability and consistency of production. Finally, by equipping the control module, the dynamic mixer 1, the gas booster module 2, the material module and the viscosity enhancer module 4 can be fully controlled. Through the control module, operators can monitor and adjust the entire production process in real time to ensure stable production operation and the production of high-quality products.

[0084] In another preferred embodiment based on the above embodiment, Figure 3 As shown, this embodiment provides a PBAT online viscosity increasing supercritical gas foaming method, comprising:

[0085] Step S100, obtaining the supercritical gas conductance, the delivery amount of the chain extender, the pressure between the metering pump and the dynamic mixer, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer.

[0086] Step S200, adjusting the pumping amount of the plastic melt when pumping into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer.

[0087] Step S300, adjusting the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount.

[0088] Step S400, obtaining the uniformity difference of the materials after mixing and stirring inside the dynamic mixer, and correcting the stirring speed during stirring according to the uniformity difference of the material mixing.

[0089] It can be understood that the PBAT online viscosity increasing supercritical gas foaming system and foaming method in the above-mentioned embodiments of the present invention have the same beneficial effects, which will not be described in detail.

[0090] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0091] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0092] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0093] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A PBAT online thickening supercritical gas foaming system, characterized in that: include: A dynamic mixer is used to mix and stir the plastic melt, chain extender and supercritical gas; A gas pressurizing module, one end of which is connected to a gas source, and the other end of which is connected to the dynamic mixer, wherein the gas pressurizing module is used to pressurize the gas diverted from the gas source to the supercritical gas, and the gas pressurizing module is also used to divert the supercritical gas to the dynamic mixer, wherein the gas pressurizing module is also provided with a gas metering unit, and the gas metering unit is used to detect the diversion amount of the supercritical gas; A material module, connected to the dynamic mixer, and used for conveying the plastic melt to the dynamic mixer; a tackifier module, connected to the dynamic mixer, and used to deliver the chain extender to the dynamic mixer, wherein the tackifier module is provided with a fluid metering unit, and the fluid metering unit is used to detect the delivery amount of the chain extender; The control module is electrically connected to the dynamic mixer, the gas booster module, the material module and the viscosity enhancer module respectively, and the control module is used to control the gas booster module, the material module and the viscosity enhancer module.

2. The PBAT online viscosity increasing supercritical gas foaming system according to claim 1, characterized in that: The material module includes: A metering pump, connected to the dynamic mixer, and used to pump the plastic melt into the dynamic mixer; A pressure detection unit is disposed between the metering pump and the dynamic mixer, and is used to detect the pressure between the metering pump and the dynamic mixer.

3. The PBAT online viscosity increasing supercritical gas foaming system according to claim 2, characterized in that: The control module comprises: A collection unit is electrically connected to the gas metering unit, the fluid metering unit, the metering pump and the pressure detection unit, and is used to collect the supercritical gas conductance, the delivery amount of the chain extender, the pressure between the metering pump and the dynamic mixer, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer; The central control unit is electrically connected to the collection unit, the gas booster module, the viscosity enhancer module and the metering pump, respectively. The central control unit is used to adjust the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer. The central control unit is also used to adjust the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount.

4. The PBAT online viscosity increasing supercritical gas foaming system according to claim 3, characterized in that: The central control unit is used to adjust the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer, and includes: The central control unit is also used to obtain the real-time pressure between the metering pump and the dynamic mixer, and compare the real-time pressure with the preset pressure, and determine the adjustment coefficient of the pumping amount when the plastic melt is pumped into the dynamic mixer according to the comparison result, wherein; When the real-time pressure is equal to the preset pressure, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when being pumped into the dynamic mixer is M0; When the real-time pressure is less than the preset pressure, the central control unit obtains the pressure difference between the real-time pressure and the preset pressure, and determines the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure difference.

5. The PBAT online viscosity increasing supercritical gas foaming system according to claim 4, characterized in that: When the central control unit determines the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the pressure difference, it includes: The central control unit is configured with a first preset pressure difference and a second preset pressure difference, and the first preset pressure difference is smaller than the second preset pressure difference; The central control unit is also used to determine the adjustment coefficient of the pumping amount of the plastic melt when it is pumped into the dynamic mixer according to the relationship between the pressure difference and each preset pressure difference, wherein: When the pressure difference is less than or equal to the first preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when being pumped into the dynamic mixer is M1; When the pressure difference is less than or equal to the second preset pressure difference, and the pressure difference is greater than the first preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when pumped into the dynamic mixer is M2; When the pressure difference is greater than the second preset pressure difference, the central control unit determines that the adjustment coefficient of the pumping amount of the plastic melt when being pumped into the dynamic mixer is M3; Moreover, M0<M1<M2<M3.

6. The PBAT online viscosity increasing supercritical gas foaming system according to claim 3, characterized in that: The central control unit is also used to adjust the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount, including: The central control unit is further used to determine the adjustment coefficient of the supercritical gas conductance and the delivery amount of the chain extender according to the relationship between the pumping amount and the preset pumping amount, wherein: When the pumping amount is consistent with the preset pumping amount, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N0, and the adjustment coefficient of the chain extender delivery amount is B0; When the pumping amount is inconsistent with the preset pumping amount, the central control unit obtains the pumping amount ratio between the pumping amount and the preset pumping amount, and determines the adjustment coefficient of the supercritical gas conductance and the chain extender delivery amount according to the pumping amount ratio.

7. The PBAT online viscosity increasing supercritical gas foaming system according to claim 6, characterized in that: When the central control unit determines the adjustment coefficient of the supercritical gas conductance and the delivery amount of the chain extender according to the pumping amount ratio, it includes: The central control unit is also configured with a first preset pumping volume ratio and a second preset pumping volume ratio, and the first preset pumping volume ratio is smaller than the second preset pumping volume ratio; The central control unit is also used to determine the adjustment coefficient of the supercritical gas conductance and the delivery amount of the chain extender according to the relationship between the pumping amount ratio and each preset pumping amount ratio, wherein; When the pumping amount ratio is less than or equal to the first preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N1, and the adjustment coefficient of the chain extender delivery amount is B1; When the pumping amount ratio is less than or equal to the second preset pumping amount ratio, and the pumping amount is greater than the first preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N2, and the adjustment coefficient of the chain extender delivery amount is B2; When the pumping amount ratio is greater than the second preset pumping amount ratio, the central control unit determines that the adjustment coefficient of the supercritical gas conductance is N3, and the adjustment coefficient of the chain extender delivery amount is B3; Moreover, N0<N1<N2<N3; B0<B1<B2<B3.

8. The PBAT online viscosity increasing supercritical gas foaming system according to claim 1, characterized in that: The dynamic mixer is also provided with a driving motor and a uniformity adjustment module, wherein: The driving motor is connected to the stirring shaft of the dynamic mixer, and the driving motor is used to drive the rotation of the stirring shaft; The uniformity adjustment module is arranged at the extrusion port of the dynamic mixer, and the uniformity adjustment module is electrically connected to the drive motor. The uniformity adjustment module is used to detect the uniformity of the material mixing after mixing and stirring inside the dynamic mixer, and to correct the driving speed of the drive motor according to the uniformity of the material mixing.

9. The PBAT online viscosity increasing supercritical gas foaming system according to claim 8, characterized in that: The uniformity adjustment module, when correcting the driving speed of the driving motor according to the uniformity of the material mixing, includes: The uniformity adjustment module is also used to obtain the uniformity difference between the real-time uniformity of the material mixing and the preset uniformity; The uniformity adjustment module is further configured with a first preset uniformity difference value and a second preset uniformity difference value, wherein the first preset uniformity difference value is smaller than the second preset uniformity difference value, and the first preset uniformity difference value is smaller than 0; The uniformity adjustment module is further used to determine a correction coefficient of the driving speed according to a relationship between the uniformity difference and each preset uniformity difference; When the uniformity difference is less than or equal to the first preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K3; When the uniformity difference is equal to 0 and the uniformity difference is greater than the first preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K0; When the uniformity difference is greater than 0 and the uniformity difference is less than or equal to the second preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K2; When the uniformity difference is greater than the second preset uniformity difference, the uniformity adjustment module determines the correction coefficient of the driving speed to be K1; Moreover, K1<K0<K2<K3.

10. A PBAT online thickening supercritical gas foaming method, applicable to a PBAT online thickening supercritical gas foaming system as claimed in any one of claims 1 to 9, characterized in that: include: Obtain the supercritical gas conductance, the delivery amount of the chain extender, the pressure between the metering pump and the dynamic mixer, and the pumping amount of the plastic melt when it is pumped into the dynamic mixer; adjusting the amount of the plastic melt pumped into the dynamic mixer according to the pressure between the metering pump and the dynamic mixer; adjusting the supercritical gas conductance and the chain extender delivery amount according to the pumping amount; The uniformity difference of the materials after mixing and stirring in the dynamic mixer is obtained, and the stirring speed during stirring is corrected according to the uniformity difference of the material mixing.

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