CN215151684U - Polyester material melt extrusion continuous tackifying system - Google Patents
Polyester material melt extrusion continuous tackifying system Download PDFInfo
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- CN215151684U CN215151684U CN202121486889.0U CN202121486889U CN215151684U CN 215151684 U CN215151684 U CN 215151684U CN 202121486889 U CN202121486889 U CN 202121486889U CN 215151684 U CN215151684 U CN 215151684U
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Abstract
The utility model discloses a polyester material melt extrusion continuous tackifying system, which comprises a double-screw extruder, a static mixer and a three-screw extruder which are sequentially communicated, wherein the double-screw extruder and the three-screw extruder are exhaust extruders, the exhaust extruders exhaust air by vacuumizing, and vacuum exhaust ports are respectively arranged on the double-screw extruder and the three-screw extruder; the double-screw extruder and the three-screw extruder are connected through a heat-insulating pipeline, and the static mixer is positioned on the heat-insulating pipeline; the heat preservation pipeline is provided with a catalyst feeding point communicated with the interior of the heat preservation pipeline. The utility model discloses well adoption double screw extruder melting plastify is extruded, and static mixer makes the fuse-element mix with the catalyst of replenishing, and three screw extruder vacuums and devolatilizes, the fuse-element tackify. The devolatilization characteristic that the three-screw extruder can exhaust gas in high vacuum and has good exhaust effect is fully utilized, so that generated small molecules such as water and the like are rapidly removed, the polycondensation reaction is promoted to continuously proceed to the forward reaction, and the molecular weight and the intrinsic viscosity of the polyester are continuously improved along with the proceeding of the reaction.
Description
Technical Field
The utility model relates to a polyester material melt extrudes continuous tackification system, especially relates to a polyester material melt extrudes continuous tackification system.
Background
Polyester materials are prepared by esterification and melt polycondensation, the molecular weight of the polyester materials can only reach a relatively low level due to the limitation of technology, equipment and economy, and in order to obtain higher molecular weight, the melt-polycondensed polyester products are further polymerized and processed by adopting solid-phase continuous polycondensation.
In addition, when the polyester waste is recycled, because the polyester waste is subjected to a high-temperature melting processing process, polyester macromolecules are hydrolyzed or degraded to a certain extent, the molecular weight and the intrinsic viscosity of the polyester macromolecules are reduced to different degrees, and in order to achieve the performance of the original new material, the polyester is tackified and the molecular weight is improved, and solid-phase tackification and chain extension tacking are common technical means.
And (3) chain extension and tackifying, namely, adding a chain extender with multiple functional groups, and connecting a plurality of polyester macromolecules together by reacting each functional group on the chain extender with a reaction group in a polyester molecule to improve the viscosity and the related performance of the polyester material. After chain extension and crosslinking, a plurality of reticular crosslinking structures are added in the macromolecular structure of the polyester, so that the performance of the material is changed to a certain extent, and some adverse effects are brought to the processing and molding of the material. This method is not the most desirable method for tackifying polyesters.
The solid-phase tackifying can lengthen the polyester molecular chain in the reaction process, improve the molecular weight and comprehensively improve the performance. The solid-phase tackifying keeps the purity of the original polyester molecular structure and is an effective continuation of the melt polycondensation reaction. However, the solid phase continuous tackifying of polyester is carried out on the basis of pre-crystallization, and research shows that the solid phase tackifying of polyester materials only starts to react at 150 ℃ and has commercial value at the temperature of more than 200 ℃, and the reaction speed is increased by 1 time when the temperature is increased by 12-13 ℃. Therefore, the reactor temperature for solid phase adhesion is designed to be 205-210 ℃ or higher, and the reaction is required to be carried out for 10-20 hours in a vacuum state. Therefore, it is not feasible to use low temperature reaction for solid phase continuous viscosity increase, and actually, to improve the production efficiency, the volume of the reaction vessel is designed to be larger, which needs sufficient material handling capacity for support.
In the case of modified polyester materials such as PETG, crystallization is difficult, and softening adhesion occurs at about 90 ℃ due to the melting point of less than 200 ℃, so that the solid-phase continuous tackifying treatment of the polyester materials is not practical. Although chain extension tackifying can improve the intrinsic viscosity and molecular weight of modified polyester materials such as PETG to a certain extent, the tackified materials have certain differences in processability and physical properties due to the existence of a cross-linked molecular structure, and cannot meet the requirements of high-end products with uniform properties.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a polyester material fuse-element is extruded and is increased viscosity system in succession.
The utility model discloses an innovation point lies in adopting double screw extruder melting plastify to extrude, and static mixer makes the fuse-element and the catalyst miscibilistic that adds, and three screw extruder vacuum devolatilizes, the fuse-element tackify. The devolatilization characteristic that the three-screw extruder can exhaust gas in high vacuum and has good exhaust effect is fully utilized, so that small molecules such as water generated by the polycondensation reaction in the melt are rapidly removed, the polycondensation reaction is promoted to continue to proceed in the forward and reverse directions, and the molecular weight and the intrinsic viscosity of the polyester are continuously improved along with the proceeding of the reaction.
In order to realize the purpose of the utility model, the technical proposal of the utility model is that: a polyester material melt extrusion continuous tackifying system comprises a double-screw extruder, a static mixer and a three-screw extruder which are sequentially communicated, wherein the double-screw extruder and the three-screw extruder are exhaust extruders, the exhaust extruders are used for vacuumizing and exhausting, and vacuum exhaust ports are arranged on the double-screw extruder and the three-screw extruder; the double-screw extruder and the three-screw extruder are connected through a heat-insulating pipeline, and the static mixer is positioned on the heat-insulating pipeline; and a catalyst feeding point communicated with the inside of the heat-insulating pipeline is arranged on the heat-insulating pipeline.
Further, the catalyst feeding point is a feeding hopper, and a feeding screw is arranged in the feeding hopper. The feeding is more accurate.
Further, the temperature on the three screw extruder increases continuously from the inlet end to the outlet end.
Further, three screw extruder adopts multistage vacuum exhaust structure, is equipped with four vacuum exhaust ports on the three screw extruder, and three screw extruder divide into anterior segment, middle section and back end from length direction, and the anterior segment is equipped with a vacuum exhaust port, and the middle section is equipped with two vacuum exhaust ports, and the back end is equipped with a vacuum exhaust port. The front section, the middle section and the rear section can exhaust air, the reaction at the middle section is the most violent, and two vacuum exhaust ports are arranged at the middle section.
Further, the static mixer is a ROSS ISG static mixer. The mixing effect is better.
Further, the double-screw extruder adopts a double-exhaust structure, and two vacuum exhaust ports on the double-screw extruder are positioned at the middle section of the double-screw extruder.
The utility model has the advantages that:
1. the utility model discloses well adoption double screw extruder melting plastify is extruded, and static mixer makes the fuse-element mix with the catalyst of replenishing, and three screw extruder vacuums and devolatilizes, the fuse-element tackify. The devolatilization characteristic that the three-screw extruder can exhaust gas in high vacuum and has good exhaust effect is fully utilized, so that small molecules such as water generated by the polycondensation reaction in the melt are rapidly removed, the polycondensation reaction is promoted to continue to proceed in the forward and reverse directions, and the molecular weight and the intrinsic viscosity of the polyester are continuously improved along with the proceeding of the reaction.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Example 1: a polyester material melt extrusion continuous tackifying system comprises a double-screw extruder 1, a static mixer 2 and a three-screw extruder 3 which are sequentially communicated, wherein the double-screw extruder 1 and the three-screw extruder 3 are exhaust extruders, the exhaust extruders are used for vacuumizing and exhausting, and vacuum exhaust ports are arranged on the double-screw extruder 1 and the three-screw extruder 3; the temperature on the triple screw extruder 3 increases from the inlet end to the outlet end. Static mixer 2 is a ROSS ISG static mixer. The double-screw extruder 1 and the three-screw extruder 3 are connected through a heat-insulating pipeline 4, and the static mixer 2 is positioned on the heat-insulating pipeline 4; the heat preservation pipeline 4 is provided with a catalyst feeding point 5 communicated with the interior of the heat preservation pipeline 4, the catalyst feeding point 5 is a feeding hopper, and a feeding screw is arranged in the feeding hopper.
Three screw extruder 3 adopts multistage vacuum exhaust structure, is equipped with four vacuum exhaust ports 6 on three screw extruder 3, and three screw extruder 3 is from length direction and is divided into anterior segment, middle section and back end, and the anterior segment is equipped with a vacuum exhaust port 6, and the middle section is equipped with two vacuum exhaust ports 6, and the back end is equipped with a vacuum exhaust port 6.
The double-screw extruder 1 adopts a double-exhaust structure, and two vacuum exhaust ports 6 on the double-screw extruder are positioned at the middle section of the double-screw extruder 1.
When the device works, polyester particles or polyester crushed materials are added into a double-screw extruder 1, heated, melted, plasticized and extruded, and air (moisture) remained in the materials and micromolecule substances generated in the plasticizing process are removed completely by vacuumizing during extrusion. The extruded and plasticized melt enters a static mixer 2 through a heat-insulating pipeline 4 under the conveying action of a double-screw extruder 1. The polycondensation catalyst, namely ethylene glycol antimony, is added to the heat-insulating pipeline 4 through the catalyst feeding point 5, and because a certain amount of catalyst residues exist in the polyester material, the addition is performed here to improve the reaction rate of the polyester melt, and obtain higher reaction efficiency and tackifying effect. The added catalyst is fully fused with the melt in the static mixer 2 and is uniformly dispersed into the polyester melt. The melt supplemented with the catalyst is mixed and dissolved, and enters the three-screw extruder 3 rotating in the same direction through the heat insulation pipeline 4, in order to better meet the devolatilization requirement of a melt reaction system, the three-screw extruder 3 adopts a multi-section vacuum exhaust structure, the screw adopts a thread structure with a shallow screw groove and a large screw pitch, so that a larger melt film surface is favorably formed in the extrusion process of the three-screw extruder 3, the melt devolatilization and tackifying reaction is facilitated, and the polycondensation reaction is continuously carried out in the forward and reverse reaction directions in the forward pushing process of the three-screw extruder 3, the polyester molecular weight is increased, the viscosity of the polyester melt is also increased, and the resistance of the screw extrusion is increased. By adopting the design of temperature gradient from low to high, the viscosity of the polyester melt at the front section can be reduced by slowly increasing the temperature of the melt, and the pressure of melt viscosity increase caused by the increase of the molecular weight of the polyester in the extrusion process is weakened. In addition, the high shear of the three-screw extruder 3 can also effectively reduce and relieve the viscosity rise problem caused by the increase of molecular weight in the extrusion process of polyester melt. After leaving the three-screw extruder 3, the mixture can be directly processed into a product through a die or can be used after being pelletized.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (6)
1. A polyester material melt extrusion continuous tackifying system is characterized by comprising a double-screw extruder, a static mixer and a three-screw extruder which are sequentially communicated, wherein the double-screw extruder and the three-screw extruder are exhaust extruders, the exhaust extruders are used for vacuumizing and exhausting, and vacuum exhaust ports are arranged on the double-screw extruder and the three-screw extruder; the double-screw extruder and the three-screw extruder are connected through a heat-insulating pipeline, and the static mixer is positioned on the heat-insulating pipeline; and a catalyst feeding point communicated with the inside of the heat-insulating pipeline is arranged on the heat-insulating pipeline.
2. The polyester material melt extrusion continuous tackifying system of claim 1, wherein said catalyst feeding point is a hopper, and a feeding screw is arranged in said hopper.
3. The polyester material melt extrusion continuous tackifying system of claim 1, wherein the temperature on said three screw extruder increases continuously from the inlet end to the outlet end.
4. The system of claim 1, wherein the three-screw extruder has a multi-stage vacuum exhaust structure, and four vacuum exhaust ports are disposed on the three-screw extruder, and the three-screw extruder is divided into a front stage, a middle stage and a rear stage along the length direction, wherein the front stage has one vacuum exhaust port, the middle stage has two vacuum exhaust ports, and the rear stage has one vacuum exhaust port.
5. The polyester material melt extrusion continuous tackifying system of claim 1, wherein said static mixer is a ROSS ISG static mixer.
6. The polyester material melt extrusion continuous tackifying system of claim 1, wherein said twin screw extruder adopts a double exhaust structure, and two vacuum exhaust ports on the twin screw extruder are located at the middle section of the twin screw extruder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121486889.0U CN215151684U (en) | 2021-07-01 | 2021-07-01 | Polyester material melt extrusion continuous tackifying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121486889.0U CN215151684U (en) | 2021-07-01 | 2021-07-01 | Polyester material melt extrusion continuous tackifying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215151684U true CN215151684U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121486889.0U Active CN215151684U (en) | 2021-07-01 | 2021-07-01 | Polyester material melt extrusion continuous tackifying system |
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| CN (1) | CN215151684U (en) |
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2021
- 2021-07-01 CN CN202121486889.0U patent/CN215151684U/en active Active
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