Production system of polyimide slurry

Abstract

The utility model discloses a production system of polyimide slurry. The production system comprises a metering tank, a dissolving kettle, a plate filter, a micro-filter and a middle kettle, a liquid feeding hole of the dissolving kettle is connected with a discharging hole of the metering tank; a feeding hole of the plate filter is connected with a discharging hole of the dissolving kettle; a feed port of the middle kettle is connected with a discharge port of the plate filter through the micro-filter; a first stirrer is arranged in the dissolving kettle; a second stirrer is arranged in the plate filter; and a third stirrer is arranged in the middle kettle. According to the utility model, the combined stirrer is adopted in the dissolving kettle, so that the mixing and dissolving speed of materials with drastically changed viscosity can be effectively increased, and a good stirring effect is always realized in the whole dissolving process; meanwhile, the blade stirrer is mounted in the plate filter, so that deposition of fine-particle insoluble substances and gel on the filter plate can be delayed, the gel and the fine-particle insoluble substances can be mutually combined to form large solid particles, material filtration is facilitated, the production efficiency is greatly improved, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to a production system for polyimide slurry. Background Art

[0002] As a specialty engineering material, polyimide has been widely used in aviation, aerospace, microelectronics, nanotechnology, liquid crystals, separation membranes, lasers, and other fields. In the 1960s, countries around the world listed the research, development, and utilization of polyimide as one of the most promising engineering plastics of the 21st century. Due to its outstanding performance and synthesis characteristics, polyimide's enormous application prospects, whether as a structural or functional material, have been fully recognized.

[0003] Polyimide paste, a specialized type of polyimide material, boasts broad application prospects in electronics, new energy, aerospace, and other fields due to its advantages, including high thermal stability, mechanical strength, chemical stability, electrical insulation properties, and specialized manufacturing processes. Entering the 21st century, with the explosive growth of emerging industries such as smartphones, wearable devices, and new energy vehicles, the application scope of polyimide paste has further expanded, with breakthroughs particularly seen in flexible circuit boards, OLED display technology, and lithium-ion battery separators. During this period, the research and development focus of polyimide pastes shifted to improving the material's mechanical flexibility, optical transparency, thermal stability, and chemical stability to meet the urgent demands of emerging technologies for lightweight, thin, highly durable, and highly functional materials. In recent years, driven by 5G communications, the Internet of Things, and artificial intelligence technologies, the polyimide paste industry has ushered in a new round of industrial upgrading. High-frequency and high-speed transmission require materials with lower signal loss and improved heat resistance, prompting companies to continuously optimize formulations and develop high-performance polyimide pastes with low dielectric constants and low dielectric loss.

[0004] Due to its special uses, users of polyimide slurry have high requirements for its quality indicators, such as solid content, viscosity, number of particulate impurities and storage stability, which puts higher demands on the polyimide slurry production system. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems and provide a production system for polyimide slurry.

[0006] The technical solution for achieving the purpose of the utility model is: a polyimide slurry production system, including a metering tank, a dissolving kettle, a plate filter, a microfilter and an intermediate kettle.

[0007] The metering tank is provided with a metering tank feed port, a metering tank discharge port, a metering tank nitrogen inlet and a metering tank exhaust port.

[0008] The dissolving kettle is provided with a dissolving kettle liquid feed port, a dissolving kettle solid feed port, a dissolving kettle third feed port, a dissolving kettle discharge port, a dissolving kettle nitrogen inlet, a dissolving kettle exhaust port and a first agitator; the dissolving kettle liquid feed port is connected to the metering tank discharge port.

[0009] The plate filter is provided with a plate filter feed port, a plate filter discharge port, a plate filter exhaust port, a filter plate and a second agitator; the plate filter feed port is connected to the dissolution kettle discharge port.

[0010] The intermediate kettle is provided with an intermediate kettle feed port, an intermediate kettle discharge port, an intermediate kettle nitrogen inlet, an intermediate kettle exhaust port and a third agitator; the intermediate kettle feed port is connected to the plate filter discharge port through a microfilter.

[0011] Furthermore, the discharge port of the intermediate kettle is connected to the third feed port of the dissolving kettle.

[0012] Furthermore, the first agitator consists of a stirring rod, a frame stirring portion and a spiral stirring portion; the frame stirring portion is installed at the front end of the stirring rod; and the spiral stirring portion is installed around the middle of the stirring rod through two support rods.

[0013] Furthermore, the second agitator is a paddle agitator.

[0014] The positive effects of this utility model are:

[0015] (1) In the early stage of dissolution, polyimide resin powder is mainly solid powder and solvent. The viscosity of the liquid is low and it easily sinks to the bottom, making it unsuitable to use a conventional ribbon stirrer. In the middle stage of dissolution, the viscosity of the material increases instantly, making it difficult for a conventional frame stirrer to achieve a good mixing effect. After a large number of experiments, the applicant found that the use of a composite stirrer with a ribbon and frame can effectively increase the mixing and dissolution speed of materials with drastic viscosity changes, thereby ensuring a good stirring effect throughout the entire dissolution process.

[0016] (2) The molecular chain of polyimide is highly polar and rigid. During the dissolution process, a small amount of fine insoluble particles and gels will inevitably appear. Although the total amount of such substances is small, they will have a great impact on the efficiency of precision filtration. After a large number of experiments, the applicant found that installing a paddle stirrer in the plate filter can not only delay the deposition of fine insoluble particles and gels on the filter plate, but also enable the gel and fine insoluble particles to combine into large solid particles, which is more conducive to material filtration, greatly improves production efficiency, enhances product quality, reduces energy consumption, and has a good prospect for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a structural diagram of a polyimide slurry production system of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the first agitator in. DETAILED DESCRIPTION

[0019] (Example 1)

[0020] See also Figure 1 The polyimide slurry production system of this embodiment includes a metering tank 100 , a dissolving kettle 200 , a plate filter 300 , a microfilter 400 and an intermediate kettle 500 .

[0021] The metering tank 100 is provided with a metering tank feed port 101 , a metering tank discharge port 102 , a metering tank nitrogen inlet 103 and a metering tank exhaust port 104 .

[0022] The dissolving kettle 200 is provided with a dissolving kettle liquid feed port 201, a dissolving kettle solid feed port 202, a dissolving kettle third feed port 203, a dissolving kettle discharge port 204, a dissolving kettle nitrogen inlet 205, a dissolving kettle exhaust port 206 and a first agitator 207; the dissolving kettle liquid feed port 201 is connected to the metering tank discharge port 102.

[0023] See also Figure 2 The first agitator 207 of this embodiment is a composite agitator of a ribbon and frame type, which consists of a stirring rod 207-1, a frame stirring portion 207-2 and a ribbon stirring portion 207-3; the frame stirring portion 207-2 is installed at the front end of the stirring rod 207-1; the ribbon stirring portion 207-3 is installed around the middle part of the stirring rod 207-1 through two support rods 207-4.

[0024] The plate filter 300 is provided with a plate filter feed port 301, a plate filter discharge port 302, a plate filter exhaust port 303, a filter plate 304, and a second agitator 305. The plate filter feed port 301 is connected to the dissolution kettle discharge port 204. The second agitator 305 of this embodiment is a paddle agitator.

[0025] The intermediate kettle 500 is equipped with an intermediate kettle feed port 501, an intermediate kettle discharge port 502, an intermediate kettle nitrogen inlet 503, an intermediate kettle exhaust port 504, and a third agitator 505. The intermediate kettle feed port 501 is connected to the plate filter discharge port 302 via a microfilter 400; the intermediate kettle discharge port 502 is connected to the third feed port 203 of the dissolution kettle. The third agitator 505 in this embodiment is a conventional frame-type agitator.

[0026] The production process of the polyimide slurry system of this embodiment is as follows:

[0027] ① Fully replace the air in the production system with nitrogen, then under nitrogen protection, add the solvent to the metering tank 100 through the metering tank feed port 101, and then meter the solvent from the metering tank discharge port 102 through the dissolving kettle liquid feed port 201 into the dissolving kettle 200, start the first agitator (compound agitator) 207, and at the same time add the polyimide resin powder to the dissolving kettle 200 through the dissolving kettle solid feed port 202, and stir to dissolve.

[0028] ② The dissolved material is added to the plate filter 300 from the dissolution kettle outlet 204 through the plate filter feed port 301, and the second agitator (paddle agitator) 305 in the plate filter 300 is turned on to filter the material. The filtrate then flows through the microfilter 400 and enters the intermediate kettle 500.

[0029] ③ The quality indicators (solid content, viscosity, number of particulate impurities, etc.) of the polyimide slurry in the intermediate kettle are tested. If it fails to meet the requirements, it is returned to the dissolving kettle 200 from the intermediate kettle outlet 502 through the third feed port 203 of the dissolving kettle, and the filtration operation is repeated until it passes the test.

Claims

1. A polyimide slurry production system, characterized in that It includes a metering tank (100), a dissolving kettle (200), a plate filter (300), a microfilter (400), and an intermediate kettle (500); The metering tank (100) is provided with a metering tank feed port (101), a metering tank discharge port (102), a metering tank nitrogen inlet (103), and a metering tank exhaust port (104); The dissolving kettle (200) is provided with a dissolving kettle liquid feed port (201), a dissolving kettle solid feed port (202), a dissolving kettle third feed port (203), a dissolving kettle discharge port (204), a dissolving kettle nitrogen inlet (205), a dissolving kettle exhaust port (206), and a first agitator (207); the dissolving kettle liquid feed port (201) is connected to the metering tank discharge port (102); The plate filter (300) is provided with a plate filter feed port (301), a plate filter discharge port (302), a plate filter exhaust port (303), a filter plate (304), and a second agitator (305); the plate filter feed port (301) is connected to the dissolution kettle discharge port (204); The intermediate kettle (500) is provided with an intermediate kettle feed port (501), an intermediate kettle discharge port (502), an intermediate kettle nitrogen inlet (503), an intermediate kettle exhaust port (504), and a third agitator (505); the intermediate kettle feed port (501) is connected to the plate filter discharge port (302) via a microfilter (400).

2. The polyimide slurry production system according to claim 1, characterized in that: The discharge port (502) of the intermediate kettle is connected to the third feed port (203) of the dissolving kettle.

3. The polyimide slurry production system according to claim 1, characterized in that: The first agitator (207) is composed of a stirring rod (207-1), a frame-type stirring portion (207-2), and a spiral-belt stirring portion (207-3); the frame-type stirring portion (207-2) is installed at the front end of the stirring rod (207-1); and the spiral-belt stirring portion (207-3) is installed around the middle of the stirring rod (207-1) via two support rods (207-4).

4. The polyimide slurry production system according to claim 1, wherein: The second agitator (305) is a paddle agitator.

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