Method for purifying poly ether-ether-ketone

Abstract

The normal pressure poly(ether-ether-ketone) purifying process includes the technological steps of purification, suction filtering and washing, and drying. During purification, metered poly(ether-ether-ketone) and metered organic solvent and surfactant used as purifying treating agent and purifying assistant separately inside reactor are heated at normal pressure to the temperature between the vitrification point of poly(ether-ether-ketone) and the boiling point of the purifying treating agent for purification for at least 1 hr. Then, the temperature is lowered to below 100 deg.c, and the product is suction filtered, washed with boiling acetone, absolute alcohol and deionized water, and dried to obtain high purity poly(ether-ether-ketone) product. The said process can lower the content of inorganic ion in poly(ether-ether-ketone) product.

Description

1. Technical field: [0001] The invention relates to a purification technology of polyetheretherketone (PEEK), in particular to a purification method of polyetheretherketone under normal pressure. 2. Background technology: [0002] Polyether ether ketone (PEEK) is a special engineering plastic with high heat resistance, which has the highest heat resistance among thermoplastics, and has excellent mechanical strength, electrical properties and radiation resistance. It can be extruded, injected , Pressing and other processing methods are processed and shaped, and the profiles can also be processed by mechanical processing methods. [0003] PEEK has been widely used in special industries, such as aerospace parts, special mechanical parts, military structural parts, military electronic parts, nuclear power and other high-tech fields. Since the directly produced polyether ether ketone contains a large amount of inorganic ions, when used in electronic and electrical applications, ...

AI Technical Summary

Problems solved by technology

These impurity ions may be wrapped inside the polyether ether ketone resin, therefore, the unpurified polyetheretherketone resin cannot be used for the purposes mentioned above

[0005] In order to minimize the inorganic ion content in polyetheretherketone resin, polyetheretherketone needs to be purified in the post-treatment stage of producing polyether ether ketone. Now, more methods are used, such as increasing the number of washing times of desalted water, increasing desalination Washing time with water, increasing the washing amount of desalinated water or raising the washing temperature of desalinated water to reduce the content of inorganic ions, these methods consume a large amount of desalinated water, and are time-consuming and energy-consuming, and also cause accumulation Ether ether ketone resin loss, and further increase the cost of polyetheretherketone resin, so the above method is not an effective method to improve the purity of polyether ether ketone