Polyarylene ether nitrile (PEN), a linear aromatic polymer compound, is widely used in industry, aerospace, automobile manufacturing, etc. The main chain of the macromolecule contains a large number of aromatic rings, and the side chain is a cyano group, which endows the polymer with heat resistance, mechanical strength and adhesive properties; in addition, the macromolecule contains a large number of ether bonds, which endows the polymer with toughness.
PEN also has excellent properties such as good self-lubrication, easy processing, stable insulation, and hydrolysis resistance, which makes it widely used in the fields of industry, aerospace, automobile manufacturing, electronic appliances, medical treatment, and food processing. The development and utilization prospects are very promising. broad.
It has excellent performance in itself, so it has a competitive advantage over other products of this type.
Extraction and separation process of polyarylether nitrile aerospace polymer materials
For the problems of the existing technology, what the new process needs to solve are the unfriendly environment caused by the use of dehydrating agents in the prior art, the polymerization system contains a large amount of salt, the difficulty of dissolution, the increase in equipment investment, and the impact on quality. Polymer plastics The special filter cleaning and drying machine meets the requirements of polyarylether nitrile separation and purification.
(1) polyarylether nitrile polymerization reaction
Potassium carbonate and 2,6-dichlorobenzonitrile are sequentially added to N-methylpyrrolidone, and the reaction solution is evenly stirred, and dihydric phenol and toluene are sequentially added to the reaction solution for dehydration reaction, and then polymerization reaction to obtain high Viscosity Polyarylether Nitrile Solution
(2) Cooling crystallization of polyarylether nitrile
The high-viscosity polyarylether nitrile solution obtained by the polymerization reaction is introduced into the autoclave, the casting head, the granulation chip and the cooling sputtering device are installed at the outlet of the autoclave, the granulation chip and the cooling sputtering device are started, and the pressure pump Send the high-viscosity polyarylether nitrile solution into the casting head of the discharge port, and use the cooling liquid polyarylether nitrile solution for sequential granulation
(3) Grinding and crushing of polyarylether nitrile
The polyarylether nitrile particles obtained by cooling and crystallization are pulverized together with the cooling liquid to obtain the particles of polyarylether nitrile powder with a length of
Cylindrical particles with a diameter of 0.25 to 0.5mm and a diameter of 0.2 to 0.45mm. (4) Polyarylene ether nitrile solvent extraction
Send the pulverized polyarylether nitrile powder into a special filter cleaning and drying machine for polymer plastics, set a cylindrical cone filter and an electric heating auxiliary device in the extraction equipment, and extract polyarylether with a mixed extraction solution of methanol and acetone Nitrile powder, filter, dissolve the polyarylether nitrile powder for 1-2 times, vacuum
(5) Polyarylene ether nitrile deionized water purification
Add deionized water into the washing filter drier, wash and filter the solvent to extract the dried polyarylether nitrile powder, dissolve the polyarylether nitrile powder 4 to 6 times with deionized water, and finally dry the refined polyarylether nitrile Polymer nitrile powder.
Improved equipment for polyarylether nitrile aviation polymer material extraction kettle Cone-type multifunctional filter washing and drying machine Technical advantages
Wuxi ZhangHua Machinery produces a multifunctional filter washing and drying machine to improve the separation and purification process in the continuous production of polyarylether nitrile, solve the existing problems in the separation and purification of polyarylether nitrile production, and ensure the continuity of polyarylether nitrile production , green environmental protection and high production efficiency. Compared with the traditional polyarylether nitrile separation and purification technology, the new technology solves the following three problems
(1) After the synthesis reaction is completed, there is no need to add a large amount of high boiling point solvent to dilute the reaction solution, and it will not be damaged by the synthesis reaction kettle.
Causes production interruptions and does not waste resources due to the use of large quantities of solvents
(2) In the separation and refining process, there is no need to set up a special precipitation kettle, simplify the process equipment and process, in addition, it is not necessary to use a large amount of precipitant to precipitate polyarylether nitrile particles, waste of precipitant and subsequent recovery of solvents such as precipitant Difficulty will not increase
(3) Compared with the traditional extraction kettle, the new technology is based on the traditional extraction kettle, and the cylindrical cone filter and electric heating auxiliary equipment suitable for the particle size of the product are designed to realize the extraction, filtration and drying of the extraction kettle. Integrated, no need to set up pipelines to transport solid powder containing a certain amount of moisture, simplifying the design and process of pipelines
(4) The all-in-one filter, washing and drying machine uses as little methanol as possible to effectively extract and refine the polyarylether nitrile crude material. When it is lower than this ratio, the refining effect of the product cannot be obtained. When it exceeds this ratio, it is easy to waste methanol
(5) The selection of the extraction temperature and extraction time of the multifunctional filter, washing and drying machine is to ensure that the extraction and refining are complete and thorough. If it is not operated within the parameter range, the refining effect will deteriorate and resources will be wasted.
The traditional polyarylether nitrile separation and purification process design is unreasonable, and the steps are cumbersome and inefficient.
The barrel-cone multifunctional filter washing and drying machine produced by Wuxi ZhangHua Machinery simplifies the production process of separation and purification of polyarylether nitrile high-performance plastics, ensures continuous production, high efficiency, low energy consumption, environmental protection, and universal applicability. Meet the requirements of industrial mass production technology.