Impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method

Abstract

The invention discloses a processing device and a preparation method of an impact-resistant and weather-resistant PE-PC alloy material, and relates to the field of injection molding.The processing device and the preparation method of the impact-resistant and weather-resistant PE-PC alloy material comprise a feeding mechanism and a transmission mechanism, and the feeding mechanism is provided with an adjustable high-shear meshing block, a long-lead threaded cylinder and a reverse threaded block; an independent closed-loop temperature control system is arranged, a sectional type variable lead screw structure is adopted, an infrared sensing technology and a PI D algorithm are combined, independent closed-loop temperature control is carried out on a PC section and a PE section, quick response can be made, the temperature interval of each functional section can be accurately adjusted, and the air degree control range is narrowed; the problems that due to the fact that the whole heat exchange system cannot accurately control the temperature of multiple sections, PE / PC is degraded or carbonized, and black spots and hollow particles are generated are solved, in addition, the functional area is matched with the sectional type variable lead screw structure to be provided with an adjustable structure, and the temperature controllable range of equipment is also expanded.

Description

Technical Field

[0001] The present invention provides a method for preparing a PE-PC alloy material, relates to the field of injection molding equipment, and specifically relates to an impact-resistant and weather-resistant PE-PC alloy material processing equipment and a preparation method. Background Art

[0002] Impact-resistant and weather-resistant PE-PC alloy material refers to a modified composite material that combines the performance advantages of polyethylene (PE) and polycarbonate (PC). In industrial use, prefabricated particles are usually used for secondary melt processing, and a twin-screw extruder is used to mix PE and PC to produce prefabricated particles.

[0003] PE and PC have large differences in polarity, and conventional twin-screw extruders are prone to interfacial stratification during mixing. High shear force and high temperature (250-300°C) are required to force compatibility. However, high temperature can easily lead to degradation or carbonization of PE / PC, resulting in black spots and hollow particles. The temperature control accuracy of traditional equipment is insufficient, and the melt temperature fluctuates by more than ±10°C, affecting the uniformity of the blend.

[0004] Therefore, those skilled in the art have proposed an impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method, improved the structure of the existing twin-screw extruder, improved the equipment's control accuracy over the temperature range, and helped reduce the problem of increased energy consumption due to the high shear structure. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method. The existing twin-screw extruder is segmented with variable lead of the screw, and an independent closed-loop temperature control is performed in combination with a high-pressure turbulent cooling system. The infrared sensor and PID algorithm are combined to make the temperature control of each functional segment more accurate and rapid, reducing the response time to within 3 seconds, and avoiding local temperature inaccuracy that may lead to degradation or carbonization of PE / PC.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a kind of impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method, including a feeding mechanism and a transmission mechanism. The feeding mechanism provides power through the transmission mechanism to mix and convey multiple materials. During the conveying process, the mixing and homogenization of multiple raw materials are achieved through extrusion between the twin-screw structures.

[0007] Preferably, based on the infrared sensor and the PID algorithm, the exhaust temperature of the exhaust port is quickly responded to, and then the PC section and the PE section are independently closed-loop temperature controlled by the PID algorithm. A high-pressure turbulent cooling system is arranged on the outside of the feeding mechanism, and the high-pressure turbulent cooling system is provided with a double-helix water channel structure. The water channel input pressure is 120PSI. The heat energy of the material is quickly extracted through the high-pressure water flow and the double-helix water channel structure, forming the temperature control system of the entire equipment.

[0008] The screw combination is adjusted based on real-time feedback of the melt pressure, significantly reducing ineffective shear work. The dual-channel high-pressure cooling system realizes the segmented and rapid extraction of shear heat, avoiding the additional energy consumption caused by the lag in traditional cooling response.

[0009] An auxiliary cooling unit is added to the exhaust section of the feeding mechanism, and the auxiliary cooling unit includes an infrared temperature measuring unit. The infrared temperature measuring unit is set corresponding to the exhaust port, and the independently set high-pressure turbulent cooling system is controlled by a PID algorithm unit.

[0010] The cooling liquid delivery pressure in each functional area can be accurately and quickly adjusted based on the exhaust port gas temperature monitoring data. The monitoring data can be quickly responded to to derive the heat of the locally overheated melt, reducing the load on the main cooling system, avoiding repeated shear corrections caused by temperature fluctuations, and reducing energy consumption by 12%.

[0011] The feeding mechanism adopts a segmented variable lead screw structure, and the segmented variable lead screw structure includes a main screw. The rotation and extrusion of the main screw realizes material transportation.

[0012] Preferably, a mounting rod is fixed on one side of the main screw, and a high shear engagement block is slidably installed on the outer side of the main screw through the mounting rod to form a PC high-temperature melting section. A spring is sleeved on the side of the mounting rod, and a tightening nut is threadedly sleeved on one end of the main screw side that presses against the spring away from the high shear engagement block.

[0013] When the pressure of the auxiliary cooling unit in the local closed loop is observed, the elastic force of the spring on the high shear engagement block is changed by adjusting the installation position of the tightening nut relative to the installation rod, and the angle between the inner thread of the high shear engagement block and the main screw is changed, thereby realizing the adjustment of the shear force of the PC high-temperature melting section and reducing the workload of the independent closed-loop temperature control system of the section.

[0014] Preferably, a long lead thread barrel is provided on the side of the main screw to constitute a PE plasticizing section, and a positioning ring is connected to the side thread sleeve of the end of the main screw. The installation cooperation between the main screw and the long lead thread barrel is adjusted by the positioning ring. By rotating the positioning ring, the extension length of the positioning ring relative to the long lead thread barrel is adjusted to realize the control of the plasticizing temperature of the PE plasticizing section. The adjustment mechanism is similar to that of the above-mentioned PC high temperature melting section.

[0015] Preferably, a reverse thread block is arranged downstream of the side feed port, and the reverse internal thread promotes reflux mixing of the melt, which not only shortens the mixing time but also reduces the input of total shear energy.

[0016] Preferably, a ceramic fiber heat-insulating gasket is provided between the feeding section of the feeding mechanism and the second section cylinder to reduce heat conduction loss and lower the heating power requirement of the second section by 20%.

[0017] The ceramic fiber thermal insulation gasket is assembled in a plug-in and locking manner, which facilitates the replacement of the structure.

[0018] Preferably, the meshing angle between the high shear meshing block and the main screw is set to 40°-50°, and the shear angle of the PC high-temperature melting section is adjusted within this section, which not only meets the equipment's need for high shear force, but also avoids excessive shear heat leading to kinetic energy loss of the equipment.

[0019] The pitch of the long lead thread barrel is set to a length of 2D-4D, and the reverse thread block is set to a pitch ≥1D.

[0020] Preferably, the overall compression ratio of the feeding mechanism is controlled in the range of 2.5:1-3.5:1.

[0021] Preferably, the auxiliary cooling unit includes an infrared temperature measuring unit.

[0022] Preferably, threaded elements with surface sprayed tungsten carbide coating are used to reduce the friction coefficient, reduce the driving torque requirement, and reduce the overall energy consumption by 8-10%;

[0023] Preferably, the PID algorithm unit collects the detection results of the infrared temperature measurement unit on the exhaust port gas temperature, and controls the pressure of the corresponding independently set high-pressure turbulent cooling system through calculation.

[0024] Preferably, the PID algorithm is calculated according to the formula:

[0025]

[0026] Among them, U(t) is the control variable for the output pressure of the high-pressure turbulent cooling system, and the three are superimposed to form the final control signal.

[0027] Preferably, the materials are mixed and conveyed through the feeding mechanism of the segmented variable lead screw structure, the infrared sensor senses the gas temperature at the exhaust port, and the delivery pressure of the corresponding auxiliary cooling unit is adjusted accordingly through the PID algorithm, and independent closed-loop temperature control is implemented for the PC segment and the PE segment.

[0028] The present invention discloses an impact-resistant and weather-resistant PE-PC alloy material processing equipment and a preparation method, which have the following beneficial effects:

[0029] 1. This impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method adopts a segmented variable-lead screw structure, combined with infrared sensing technology and PID algorithm, to implement independent closed-loop temperature control for the PC segment and PE segment. It can quickly respond and accurately adjust the temperature range of each functional segment, narrow the airiness control range, and avoid the overall heat exchange system's inability to accurately control the temperature of multiple segments, which may lead to PE / PC degradation or carbonization, resulting in black spots and hollow particles. In addition, the functional area is equipped with an adjustable structure in conjunction with the segmented variable-lead screw structure, which also extends the equipment's controllable temperature range.

[0030] 2. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method are equipped with independent closed-loop temperature control systems for corresponding functional sections. The exhaust temperature at the air outlet is monitored by an infrared sensor, and the delivery pressure of the independent closed-loop temperature control system is automatically controlled by a PID algorithm. The movable structure of the section is adjusted according to the change in the delivery pressure, so that the equipment can perform temperature control in a larger temperature range. To a certain extent, the equipment can automatically adjust the temperature range of the stable section through the PID algorithm, and combined with manual auxiliary adjustment to ensure the stable operation of the equipment, thereby ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the feeding mechanism surrounding the main screw of the present invention;

[0034] Figure 3 This is a schematic diagram of the installation and adjustment structure of the high shear engagement block of the present invention;

[0035] Figure 4 This is a schematic diagram of the installation structure of the long lead thread barrel and the reverse thread block of the present invention.

[0036] In the figure: 1. Feeding mechanism; 101. Main screw; 102. High-shear meshing block; 103. Long-lead thread barrel; 104. Reverse thread block; 2. Transmission mechanism; 3. High-pressure turbulent cooling system; 4. Auxiliary cooling unit; 401. Infrared temperature measurement unit; 5. Mounting rod; 6. Spring; 7. Adjusting nut; 8. Positioning ring; 9. Ceramic fiber insulation gasket. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] The embodiment of the present invention discloses an impact-resistant and weather-resistant PE-PC alloy material processing equipment and a preparation method;

[0039] According to the attached Figure 1-4 As shown, it includes a feeding mechanism 1 and a transmission mechanism 2. The feeding mechanism 1 provides power through the transmission mechanism 2 to mix and transport multiple materials. During the transportation process, the mixing and homogenization of multiple raw materials are achieved through extrusion between the twin-screw structures.

[0040] Based on infrared sensors and PID algorithms, it quickly responds to the exhaust temperature at the exhaust port, and then implements independent closed-loop temperature control of the PC section and PE section through the PID algorithm. A high-pressure turbulent cooling system 3 is set on the outside of the feeding mechanism 1. The high-pressure turbulent cooling system 3 is equipped with a double-helix water channel structure. The conventional input pressure of the water channel is 120PSI. The heat energy of the material is quickly extracted through the high-pressure water flow and the double-helix water channel structure, forming the overall temperature control system of the equipment.

[0041] The screw combination is adjusted based on the real-time feedback of the melt pressure, and the pressure of the independently set high-pressure turbulent cooling system 3 is adjusted based on the rapid feedback of the exhaust temperature at the outlet. The temperature is automatically adjusted in stages within a certain range. Manual assistance can also be provided here, and the equipment can be adjusted within a larger temperature range to ensure the temperature range of the internal melt.

[0042] In addition, this structure can significantly reduce ineffective shear work. The dual-channel high-pressure cooling system realizes the segmented and rapid extraction of shear heat, avoiding the additional energy consumption caused by the lag in traditional cooling response.

[0043] An auxiliary cooling unit 4 is added to the exhaust section of the feeding mechanism 1. The auxiliary cooling unit 4 includes an infrared temperature measuring unit 401. The infrared temperature measuring unit 401 is set corresponding to the exhaust port. The temperature of the gas exhausted in stages is detected, and the data is fed back to the PID algorithm unit. The PID algorithm unit is used to control the independently set high-pressure turbulent cooling system 3.

[0044] Based on the exhaust gas monitoring data, the cooling liquid delivery pressure of each functional area can be accurately and quickly adjusted to quickly respond to the monitoring data to derive the heat of the local overheated melt, reduce the load of the main cooling system, avoid repeated shear corrections caused by temperature fluctuations, and reduce energy consumption by 12%.

[0045] The feeding mechanism 1 adopts a segmented variable lead screw structure, which includes a main screw 101. The main screw 101 rotates and extrudes to realize material transportation.

[0046] A mounting rod 5 is fixed on one side of the main screw 101, and a high shear engagement block 102 is slidably installed on the outside of the main screw 101 through the mounting rod 5 to form a PC high-temperature melting section. A spring 6 is sleeved on the side of the mounting rod 5, and a tightening nut 7 is threadedly sleeved on the end of the main screw 101 that presses against the spring 6 away from the high shear engagement block 102.

[0047] When the pressure of the local closed-loop auxiliary cooling unit 4 is observed, the elastic force of the spring 6 on the high shear engagement block 102 is changed by adjusting the installation position of the tightening nut 7 relative to the installation rod 5, and then the angle between the inner thread of the high shear engagement block 102 and the main screw 101 changes, thereby realizing the adjustment of the shear force of the PC high-temperature melting section and reducing the workload of the independent closed-loop temperature control system of the section.

[0048] A long lead thread barrel 103 is provided on the side of the main screw 101 to constitute a PE plasticizing section. A positioning ring 8 is connected to the side thread sleeve of the end of the main screw 101. The installation cooperation between the main screw 101 and the long lead thread barrel 103 is adjusted by the positioning ring 8. By rotating the positioning ring 8, the extension length of the positioning ring 8 relative to the long lead thread barrel 103 is adjusted to realize the control of the plasticizing temperature of the PE plasticizing section. The adjustment mechanism is similar to that of the above-mentioned PC high temperature melting section.

[0049] A reverse thread block 104 is arranged downstream of the side feed port, which promotes melt reflux mixing through reverse internal threads, thereby shortening the mixing time and reducing the input of total shear energy.

[0050] A ceramic fiber heat-insulating gasket 9 is added between the feeding section of the feeding mechanism 1 and the second section cylinder to reduce heat conduction loss and reduce the heating power requirement of the second section by 20%.

[0051] The ceramic fiber heat-insulating gasket 9 is assembled by plugging and locking, which makes it easy to replace the structure.

[0052] The meshing angle between the high shear meshing block 102 and the main screw 101 is set to 40°-50°. The shear angle of the PC high-temperature melting section is adjusted within this section, which not only meets the equipment's need for high shear force, but also avoids excessive shear heat leading to kinetic energy loss of the equipment.

[0053] The pitch of the long lead thread barrel 103 is set to a length of 2D-4D, and the reverse thread block 104 is set to a pitch ≥ 1D.

[0054] The overall compression ratio of the feeding mechanism 1 is controlled in the range of 2.5:1-3.5:1.

[0055] The auxiliary cooling unit 4 includes an infrared temperature measuring unit 401 .

[0056] The use of threaded elements with surface sprayed tungsten carbide coating reduces the friction coefficient, reduces the driving torque requirement, and reduces the overall energy consumption by 8-10%;

[0057] The PID algorithm unit collects the detection results of the infrared temperature measurement unit 401 on the gas temperature at the exhaust port, and controls the pressure of the corresponding independently set high-pressure turbulent cooling system 3 through calculation.

[0058] The PID algorithm is calculated according to the formula:

[0059]

[0060] Among them, Ut is the control variable for the output pressure of the high-pressure turbulent cooling system 3, and the three are superimposed to form the final control signal.

[0061] The materials are mixed and conveyed through the feeding mechanism 1 of the segmented variable lead screw structure. The infrared sensor senses the gas temperature at the exhaust port and adjusts the delivery pressure of the corresponding auxiliary cooling unit 4 accordingly through the PID algorithm, implementing independent closed-loop temperature control for the PC segment and PE segment.

[0062] The feeding mechanism 1 conveys and mixes multiple materials in proportion, and uses the shear force of rotation to heat and mix the materials. However, the existing fixed twin-screw conveying system can only rely on the heat exchange system to coordinate the overall temperature of the equipment. The temperature control accuracy is insufficient, and the melt temperature fluctuates by more than ±10°C, affecting the uniformity of the blending.

[0063] In view of the different temperature requirements of different materials at different stages, we not only replaced the existing equipment's heat exchange system with a high-pressure turbulent cooling system 3, using high pressure and double helix to enhance the heat exchange effect, but also set up an auxiliary cooling unit 4 for each functional section. We used an infrared temperature measurement unit 401 to monitor the temperature of the exhaust gas of the functional section. The temperature data was fed back into the closed-loop auxiliary cooling unit 4 through the PID algorithm to adjust the delivery pressure. The temperature range of the unit was independently controlled, which not only achieved a fast response, but also controlled the temperature range within the range of ±2°C.

[0064] Furthermore, when it is observed that the operating pressure of the corresponding auxiliary cooling unit (4) increases significantly, the movable structure of the corresponding section can be manually adjusted to further ensure a safe temperature.

[0065] This impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method adopts a segmented variable-lead screw structure, combined with infrared sensing technology and PID algorithm, to implement independent closed-loop temperature control for the PC segment and PE segment. It can quickly respond and accurately adjust the temperature range of each functional segment, narrow the airiness control range, and avoid the overall heat exchange system's inability to accurately control the temperature of multiple segments, which may lead to degradation or carbonization of PE / PC, resulting in black spots and hollow particles. In addition, the functional area is equipped with an adjustable structure in conjunction with the segmented variable-lead screw structure, which also extends the equipment's controllable temperature range.

[0066] In addition, an independent closed-loop temperature control system is set up in the corresponding functional section. Combined with the infrared sensor to monitor the exhaust temperature of the air outlet, the delivery pressure of the independent closed-loop temperature control system is automatically controlled by the PID algorithm. The movable structure of the section setting is adjusted according to the change of the delivery pressure, so that the equipment can perform temperature control in a larger temperature range. To a certain extent, the equipment can automatically adjust the temperature range of the stable section through the PID algorithm, combined with manual assisted adjustment to ensure the stable operation of the equipment, thereby ensuring product quality.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method, comprising a feeding mechanism (1) and a transmission mechanism (2), wherein the feeding mechanism (1) provides power through the transmission mechanism (2) to mix and transport multiple materials, and is characterized in that: Based on infrared sensors and PID algorithm, independent closed-loop temperature control is implemented for the PC section and PE section; The feeding mechanism (1) adopts a segmented variable lead screw structure; A high-pressure turbulent cooling system (3) is provided outside the feeding mechanism (1); An auxiliary cooling unit (4) is added to the exhaust section of the feeding mechanism (1) to quickly remove the heat of the locally overheated melt and reduce the load of the main cooling system; The segmented variable lead screw structure comprises a main screw (101), a high shear engagement block (102) is arranged on the outside of the main screw (101) to form a PC high temperature melting section, a long lead thread barrel (103) is arranged on the side of the main screw (101) to form a PE plasticizing section, and a reverse thread block (104) is arranged downstream of the side feeding port.

2. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: A mounting rod (5) is fixed to one side of the main screw (101), and the high shear engagement block (102) is slidably mounted on one side of the main screw (101) via the mounting rod (5). A spring (6) is sleeved on the side of the mounting rod (5), and a tightening nut (7) is threadedly sleeved on one end of the side of the main screw (101) that is pressed against the spring (6) and away from the high shear engagement block (102).

3. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: A positioning ring (8) is threadedly sleeved on the side surface of the end of the main screw (101), and a ceramic fiber heat-insulating gasket (9) is added between the feeding section and the second section of the barrel of the feeding mechanism (1).

4. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: The meshing angle between the high shear meshing block (102) and the main screw (101) is set to 40°-50°, the pitch of the long lead thread barrel (103) is set to 2D-4D, and the pitch of the reverse thread block (104) is set to ≥1D.

5. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: The overall compression ratio of the feeding mechanism (1) is controlled within the range of 2.5:1-3.5:1, and the high-pressure turbulent cooling system (3) is provided with a double-helix water channel structure to increase the water channel input pressure and ensure heat exchange efficiency.

6. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: The auxiliary cooling unit (4) comprises an infrared temperature measuring unit (401), which is arranged corresponding to the exhaust port and is associated with and controlled by a PID algorithm unit to control the independently arranged high-pressure turbulent cooling system (3).

7. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: The PID algorithm unit collects the detection results of the infrared temperature measurement unit (401) on the gas temperature at the exhaust port, and controls the pressure of the corresponding independently set high-pressure turbulent cooling system (3) through calculation.

8. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: The PID algorithm is calculated according to the formula: Among them, U(t) is the control variable for the output pressure of the high-pressure turbulent cooling system (3), and the three are superimposed to form the final control signal.

9. The impact-resistant and weather-resistant PE-PC alloy material processing equipment and preparation method according to claim 1, characterized in that: The materials are mixed and conveyed by the feeding mechanism (1) of the segmented variable lead screw structure. The infrared sensor senses the gas temperature at the exhaust port and adjusts the delivery pressure of the corresponding auxiliary cooling unit (4) accordingly through the PID algorithm. Independent closed-loop temperature control is implemented for the PC section and the PE section. The specific control operation is as follows: 1) The PC high-temperature melting section adopts the high-shear meshing block (102) with adjustable position, adjusts the position distance according to the exhaust port temperature detection, changes the meshing angle between the high-shear meshing block (102) and the main screw (101), and combines the temperature control of the auxiliary cooling unit (4); 2) The PE plasticizing section is composed of the fixedly arranged long lead threaded barrel (103) and the main screw (101), and the extension length of the main screw (101) relative to the long lead threaded barrel (103) can be adjusted; 3) The reverse thread block (104) is arranged downstream of the side feed port to promote melt reflux mixing; 4) Independent auxiliary cooling units (4) are added corresponding to different functional areas to adjust the pressure according to the gas monitoring data of the exhaust port to quickly remove the heat of the locally overheated melt; 5) The combination design of high shear in the PC section and low shear in the PE section overcomes the contradiction between rigidity and energy consumption caused by the traditional single shear mode. 6) A replaceable ceramic fiber heat-insulating gasket (9) is provided between the feeding section and the second section of the cylinder to reduce heat conduction loss.

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