Preparation method for polyetheretherketone

Abstract

The invention relates to a process for preparing polyetheretherketone products, which is characterized in that the process comprises adopting Na2CO3 to be condensating agent, leading 4, 4'- difluorobenzophenone, hydroquinone and diresorcinol to have polymerization reaction, improving the reaction temperature after producing the relative prepolymer, and secondly adding hydroquinone to be chain extender to react for a period of time to prepare polyetheretherketone products with high viscosity.

Description

technical field [0001] The invention relates to a method for preparing a special functional engineering resin, more specifically a method for preparing polyether ether ketone. Background technique [0002] Polyetheretherketone (PEEK) is an aromatic linear polymer. It not only has good processing performance, but also has excellent high temperature resistance. Its load heat distortion temperature is as high as 315°C, and its continuous use temperature can reach 260°C. , At the same time, this polymer also has many excellent properties such as good wear resistance, chemical resistance, flame retardancy, hydrolysis resistance, and radiation resistance. In view of this, in addition to the application in national defense and military, PEEK is also widely used in many fields such as aerospace, automobile manufacturing, electronic appliances, medical treatment and food. [0003] From a structural point of view, PEEK is a polymer composed of ether bonds and ketone groups connecting...

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Problems solved by technology

[0007] In the existing PEEK preparation technology, no matter in terms of product quality or process maturity, the process of preparing PEEK by polycondensation of dihydric phenol and difluorobenzophenone still has a great advantage, but from the published experimental results. Look, most of them use K 2 CO 3 / Na 2 CO 3 or K 2 CO 3 / Na 2 CO 3 / SrCO 3 The mixed salt system is used as a condensing agent, and is based on K 2 CO 3 It is the main composite condensing agent, but the problems of this composite condensing agent are: potassium carbonate has strong water absorption, and it is difficult to crush and sieve, resulting in high impurity content in the product; one-time feeding cannot well control the polyetheretherketone product. Viscosity, which affects the batch stability of the product, but also has a certain impact on industrial production

In the condensation reaction, diphenol needs to form corresponding sodium phenate or potassium phenate with sodium carbonate or potassium carbonate at first, wherein the activity of potassium phenate is higher than that of sodium phenate, so it undergoes polycondensation with difluorobenzophenone It is easy to form PEEK products with larger molecular weight during the reaction, but in the later stage of the reaction, due to the high viscosity of the system, the probability of molecular collisions decreases, the molecular weight is difficult to increase to a large enough size, and the molecular weight distribution is also very wide; when sodium carbonate is used alone as the condensation agent, Due to its low activity, it is difficult to continue the reaction when the molecular weight increases to a certain extent. Therefore, it is usually impossible to prepare high-molecular-weight PEEK products, and only PEEK products with smaller molecular weights can be formed.

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