Polytetrafluoroethylene stirring paddle suitable for vacuum reaction system

Abstract

The invention provides a polytetrafluoroethylene stirring paddle suitable for a vacuum reaction system, and belongs to the technical field of stirring paddles. The stirring device comprises a stirring blade, a connector, a rivet and a stirring rod, the stirring blade is connected with the stirring rod through the connector; the connector is fixedly connected with the stirring blades and the stirring rod through the rivets; wherein the stirring blades and the connector are made of a polytetrafluoroethylene material; the rivet is a rod body formed by a stainless steel rod core and a polytetrafluoroethylene shell wrapping the stainless steel rod core. And the stirring rod is a rod body formed by a stainless steel rod core and a polytetrafluoroethylene shell coated outside the stainless steel rod core. The vacuum degree of a reaction system can be guaranteed, the experiment effect is not affected, and the device is not prone to damage in the reaction system of high-viscosity materials.

Description

Technical Field

[0001] This invention relates to the field of agitator technology, and more particularly to a polytetrafluoroethylene agitator suitable for vacuum reaction systems. Background Technology

[0002] Polytetrafluoroethylene (PTFE) is a widely used engineering plastic due to its excellent chemical stability, corrosion resistance, and high and low temperature stability. In laboratory chemical synthesis reactions, due to the numerous types of reactions involved and the varying reactivity of the reactants, especially since some acids, alkalis, acyl chlorides, and acid anhydrides are highly corrosive, highly chemically inert PTFE stirring paddles or PTFE magnetic stirrers are generally used as stirrers to promote uniform mixing and reaction of materials in the reaction system. This effectively avoids interference with the reaction system caused by metal or other materials reacting with the reactants.

[0003] Currently, PTFE magnetic stirrers are mostly used in situations where the reaction system has low viscosity and the reactor volume is small. For situations where the reaction system has high viscosity and the reactor volume is large, an electric mechanical stirrer combined with a PTFE impeller must be used to achieve good mass transfer. Generally, anchor-type PTFE impellers with moving blades are used in round-bottom flasks, while cross-shaped PTFE impellers are often used in some small, modular reactors.

[0004] Regardless of the type of PTFE (polytetrafluoroethylene) agitator, its stirring rod is currently made by encasing a stainless steel core in a PTFE tube. Neither end of the tube is sealed with PTFE, leaving a gap between the stainless steel core and the PTFE tube, allowing it to communicate with the outside atmosphere. This is clearly observable from the cross-section of the stirring rod end of existing PTFE agitators. While these PTFE agitators perform well in reaction systems without vacuum or negative pressure, they have a significant drawback in vacuum or negative pressure systems: at the connection point between the PTFE agitator and the electric mechanical stirrer, air is drawn into the reaction system through the gap between the stainless steel core and the PTFE shell, thus disrupting the vacuum level. This is clearly observed in experiments: even under vacuum or negative pressure, without heating, and before the materials reach their boiling point, the materials in the reactor exhibit boiling and turbulent activity at the PTFE agitator blade position due to the large amount of air drawn in through the gap. More seriously, the large amount of air drawn into the system at high reaction temperatures can cause product oxidation, severely affecting experimental results and the quality and performance of the experimental products. Furthermore, existing PTFE agitators all use PTFE rivets to fix the blades, connectors, and stirring rods. In reaction systems with high-viscosity materials, this can easily lead to the agitator malfunctioning due to rivet breakage. Summary of the Invention

[0005] The purpose of this invention is to provide a simple, durable, and high-strength polytetrafluoroethylene (PTFE) stirring paddle suitable for vacuum reaction systems. This invention solves the problems of existing PTFE stirring paddles in vacuum reaction systems, where air is drawn in from the gap between the stainless steel core at the end section of the connection between the stirring rod and the mechanical stirrer and the PTFE shell, thus disrupting the vacuum level of the reaction system and affecting experimental results. It also addresses the problem that in reaction systems with high-viscosity materials, the stirring paddle may malfunction due to rivet breakage.

[0006] This invention provides a polytetrafluoroethylene (PTFE) stirring paddle suitable for vacuum reaction systems, comprising a stirring blade, a connector, a rivet, and a stirring rod; the stirring blade is connected to the stirring rod via the connector; the connector is fixedly connected to the stirring blade and the stirring rod via the rivet;

[0007] The stirring blades and the connector are made of polytetrafluoroethylene.

[0008] The rivet is a rod body formed by a stainless steel core and an outer polytetrafluoroethylene shell;

[0009] The stirring rod is a rod with a stainless steel core and an outer polytetrafluoroethylene shell.

[0010] Preferably, the stirring blade is a two-bladed, movable blade.

[0011] Preferably, the blade is one of crescent-shaped, straight, cross-shaped, or plate-shaped.

[0012] Preferably, the stirring blade, the connector, and the stirring rod are all provided with rivet mounting holes, and the rivet mounting holes are matched with the rivets.

[0013] Preferably, one end of the connector is provided with a rivet mounting hole for fixing the stirring blade, and the other end is provided with a rivet mounting hole for fixing the stirring rod.

[0014] Preferably, the stirring rod has a rivet mounting hole that penetrates the rod body at one end.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) The present invention uses a uniform rod formed by a stainless steel rod core with both ends of the cross section being completely covered with polytetrafluoroethylene shell as the stirring rod. The stirring blade, connector and stirring rod are fixedly connected by rivets to form a polytetrafluoroethylene stirring paddle. This solves the problem that existing polytetrafluoroethylene stirring paddles have gaps between the stainless steel rod core and the polytetrafluoroethylene shell, which can easily draw in air from the gaps in the vacuum or negative pressure reaction system, thereby damaging the vacuum of the reaction system and affecting the experimental results.

[0017] (2) The present invention uses rivets with stainless steel cores and polytetrafluoroethylene shells to fix the agitator blades, connectors and stirring rods, which significantly improves the fixing effect and eliminates the problem that the agitator cannot work because the PTFE rivets are not strong enough and are prone to breakage in high viscosity reaction systems. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a high-strength polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a stirring rod according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of a rivet according to an embodiment of the present invention.

[0021] 1. Agitator blade; 2. Connector; 3. Rivet; 4. Agitator rod; 5. PTFE housing of the agitator rod; 6. Stainless steel core of the agitator rod; 7. Rivet mounting hole of the agitator rod; 8. Stainless steel core of the rivet; 9. PTFE housing of the rivet. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 The specific embodiments of the present invention will be described in detail below.

[0023] This invention provides a polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems, comprising a stirring blade 1, a connector 2, a rivet 3, and a stirring rod 4; the stirring blade 1 is connected to the stirring rod 4 via the connector 2; the connector 2 is fixedly connected to the stirring blade 1 and the stirring rod 4 via the rivet 3;

[0024] The stirring blade 1 and the connector 2 are made of polytetrafluoroethylene.

[0025] The rivet 3 is a rod body formed by a stainless steel core 8 and a polytetrafluoroethylene shell 9 covering the rivet.

[0026] The stirring rod 4 is a rod body formed by a stainless steel core 6 of the stirring rod and a polytetrafluoroethylene shell 5 covering the stirring rod.

[0027] According to a specific embodiment of the present invention, the stirring blade 1 is a movable two-blade blade.

[0028] According to one specific embodiment of the present invention, the blade is one of crescent-shaped, straight-line-shaped, cross-shaped, or plate-shaped.

[0029] According to a specific embodiment of the present invention, the stirring blade 1, the connecting head 2 and the stirring rod 4 are all provided with rivet mounting holes, and the rivet mounting holes are matched with the rivets 3.

[0030] According to a specific embodiment of the present invention, one end of the connector 2 is provided with a rivet mounting hole for fixing the stirring blade 1, and the other end is provided with a rivet mounting hole for fixing the stirring rod 4.

[0031] According to a specific embodiment of the present invention, the stirring rod 4 is provided at one end with a rivet mounting hole 7 for the stirring rod penetrating the rod body.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems, characterized in that: It includes a stirring blade (1), a connector (2), a rivet (3), and a stirring rod (4); the stirring blade (1) is connected to the stirring rod (4) through the connector (2); the connector (2) is fixedly connected to the stirring blade (1) and the stirring rod (4) through the rivet (3); The stirring blade (1) and the connector (2) are made of polytetrafluoroethylene. The rivet (3) is a rod body formed by a stainless steel core and an outer polytetrafluoroethylene shell; The stirring rod (4) is a rod formed by a stainless steel core and an outer polytetrafluoroethylene shell.

2. The polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems according to claim 1, characterized in that, The stirring blade (1) is a movable two-blade blade.

3. The polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems according to claim 2, characterized in that, The blades are one of the following: crescent-shaped, straight-lined, cross-shaped, or plate-shaped.

4. The high-strength polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems according to claim 1, characterized in that, The stirring blade (1), the connector (2), and the stirring rod (4) are all provided with rivet mounting holes, and the rivet mounting holes are matched with the rivets (3).

5. The polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems according to claim 4, characterized in that, The connector (2) has a rivet mounting hole at one end for fixing the stirring blade (1) and a rivet mounting hole at the other end for fixing the stirring rod (4).

6. The polytetrafluoroethylene stirring paddle suitable for vacuum reaction systems according to claim 4, characterized in that, The stirring rod (4) has a rivet mounting hole that penetrates the rod body at one end.

Images