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CN-224210280-U - Ultra-high purity polyolefin powder preparation facilities

CN224210280UCN 224210280 UCN224210280 UCN 224210280UCN-224210280-U

Abstract

The utility model relates to an ultra-high purity polyolefin powder preparation device which comprises a crushing unit and a screening unit, wherein the crushing unit comprises a pulverizer provided with a grinding part, the screening unit comprises a cyclone separator, a vibrating screen and a magnetic filter arranged at the discharge end of the vibrating screen, the discharge port of the pulverizer is communicated with the feed port of the cyclone separator through a feed pipeline, and the feed back port of the vibrating screen is communicated with the pulverizer through a feed back pipeline and is used for returning the screen residues of the vibrating screen to the pulverizer. The device realizes the crushing, sieving and demagnetizing of large-particle polyolefin materials, and improves the utilization rate of the materials and the added value of products.

Inventors

  • SHAO QINGNAN
  • DONG XIAOPAN
  • ZHU YUFEI
  • Xu Chiben
  • WANG YANLI
  • ZHANG WENLONG

Assignees

  • 朴烯晶新能源材料(上海)有限公司
  • 龙朴科技(衢州)有限公司
  • 璞烯晶新材料(上海)有限公司

Dates

Publication Date
20260508
Application Date
20250520

Claims (10)

  1. 1. The ultra-high purity polyolefin powder preparation device is characterized by comprising a crushing unit and a screening unit; the pulverizing unit comprises a pulverizer (1) provided with a grinding member; The screening unit comprises a cyclone separator (4), a vibrating screen (6) and a magnetic filter (11) arranged at the discharge end of the vibrating screen (6); The discharge port of the pulverizer (1) is communicated with the feed port of the cyclone separator (4) through a feed pipeline (2); the feed back mouth of shale shaker (6) is through returning charge pipeline (10) with milling machine (1) intercommunication is used for with the screen residue of shale shaker (6) returns milling machine (1).
  2. 2. The ultra-high purity polyolefin powder production apparatus according to claim 1, wherein the upper portion of the pulverizer (1) is connected with a feed hopper (3).
  3. 3. The ultra-high purity polyolefin powder preparation device according to claim 2, wherein polytetrafluoroethylene coatings are arranged on the inner surfaces of the feeding hopper (3), the feeding pipeline (2) and the returning pipeline (10).
  4. 4. The ultra-high purity polyolefin powder preparation device according to claim 1, wherein the crushing cavity and the grinding part of the pulverizer (1) are made of zirconia ceramics or silicon nitride materials.
  5. 5. The ultra-high purity polyolefin powder production apparatus according to claim 1, wherein the pulverizer (1) is equipped with a variable-frequency speed motor, and the pulverizer (1) is connected to a cooling system.
  6. 6. An ultra-high purity polyolefin powder production apparatus according to claim 1, wherein a rotary valve (5) is provided between the cyclone (4) and the vibrating screen (6).
  7. 7. The ultra-high purity polyolefin powder preparation apparatus according to claim 1, wherein the upper part of the cyclone separator (4) is connected with a vacuum pump (8) through a suction pipeline (7), and the outlet of the vacuum pump (8) is connected with a bag filter (9).
  8. 8. The ultra-high purity polyolefin powder preparation device according to claim 1, wherein the vibrating screen (6) adopts a detachable and replaceable non-metal woven screen, and a discharge port of the vibrating screen is in flange connection with a feed port of the magnetic filter (11).
  9. 9. The ultra-high purity polyolefin powder preparation device according to claim 1, wherein the magnetic filter (11) adopts an electric automatic demagnetizer, a rotatable electromagnet array is arranged in the magnetic filter, and an automatic impurity removing mechanism with a scraper is arranged at the bottom of the magnetic filter.
  10. 10. An ultra-high purity polyolefin powder production apparatus according to claim 1, wherein the magnetic filter (11) is connected downstream to a collection vessel (12).

Description

Ultra-high purity polyolefin powder preparation facilities Technical Field The utility model relates to the technical field of preparation of ultra-high-purity polyolefin, in particular to a device for preparing ultra-high-purity polyolefin powder. Background Polyolefin is used as a core basic raw material in the field of high polymer materials and is widely applied to injection molding, film preparation, pipe production and the like. The uniformity of the grain size of the polyolefin raw material directly affects the melt fluidity, the processing stability and the mechanical properties of the final product, so that the preparation of the high-quality polyolefin powder with controllable grain size distribution is one of the core targets of the industry. In the current industrial production, vibration screening is a common process for realizing the particle size classification of polyolefin powder, but the traditional treatment mode of large-particle materials generated in the screening process is to directly sell the large-particle materials as low-added-value products, so that the product value cannot be fully mined. Therefore, a special device which can be efficiently coupled with a vibration screening system and realize directional grinding and crushing of large-particle materials and precisely control the particle size distribution of processed powder is developed, and the special device becomes a key technical bottleneck for improving the added value of polyolefin powder production and promoting the green and efficient manufacturing of the industry. Chinese patent CN220446923U discloses a polyolefin material separating and recovering device, which comprises a bin, a crushing mechanism, a powder vibration screening mechanism, a pluggable screen plate, a lump material conveying pipe, a waste collecting box and a powder blanking tank, wherein the bin is connected with the crushing mechanism, the crushing mechanism is connected with the powder vibration screening mechanism, the powder vibration screening mechanism is respectively connected with the screening mechanism and the powder blanking tank, the screening mechanism is connected with the waste collecting box through the lump material conveying pipe, the screening mechanism is also connected with the powder blanking tank, one end of the pluggable screen plate is arranged on the side wall of the screening mechanism in a penetrating way, the other end of the pluggable screen plate is connected with the lump material conveying pipe, and the screening mechanism is used for conveying second polyolefin lump materials obtained through the pluggable screen plate screening to the waste collecting box and conveying second powder to the powder blanking tank. The device realizes the recycling of the powder in the polyolefin lump materials, reduces the loss of qualified powder, avoids economic loss to a certain extent, and realizes the effective separation of the powder and the lump materials through a plurality of screening holes of the extractable sieve plate, but cannot be used for producing ultra-high purity polyolefin powder. The ultra-high-purity polyolefin belongs to a critical base material, belongs to a material with extremely high purity, has ultra-low metal ion content, takes polyethylene as an example, can be used as a critical base material of a semiconductor industry chain, is a core raw material for the purposes of ultra-pure water filtration, ultra-pure reagent conveying pipelines, storage containers and the like for semiconductor manufacturing, directly determines the running stability and service life of an ultra-pure water system, and has an irreplaceable effect on guaranteeing the chip manufacturing yield of the semiconductor industry. Although the existing polyolefin powder preparation device can realize grain diameter control to a certain extent, the impurity removal and cleanliness control for ultra-high purity materials are lacked, so that the purity of the product is insufficient. In addition, conventional pulverizing and sieving processes may introduce metal contamination or organic residues, which are difficult to meet production requirements. Therefore, it is highly desirable to integrate high-efficiency purification, precise classification and whole-process clean control technologies on the basis of the existing devices so as to realize the industrial preparation of ultra-high-purity polyethylene. Disclosure of utility model The utility model aims to solve the problems and provide a device for preparing ultra-high purity polyolefin powder. The aim of the utility model is achieved by the following technical scheme: The ultra-high purity polyolefin powder preparation device comprises a crushing unit and a screening unit, wherein the crushing unit comprises a pulverizer provided with a grinding part, the screening unit comprises a cyclone separator, a vibrating screen and a magnetic filter arranged at the discharge end of the vibrating scr