High-melting-point three-element aromatic polyamide polymer and method for preparing precipitation fiber therefrom

Abstract

The invention discloses a high-melting-point three-element aromatic polyamide polymer and a method for preparing a precipitation fiber therefrom. The method comprises the following steps: preparing a three-element aromatic polyamide polymer from a phenylenediamine monomer and two phthaloyl chloride monomers, diluting with polar solvent, neutralizing, directly injecting the neutralized three-element aromatic polyamide resin into high-speed rotating mechanical shearing equipment without filtering, and simultaneously injecting compound precipitation agent to obtain a precipitation fiber suspension; and washing off solvent, salt, aids and other impurities contained in the suspension to obtain the three-element aromatic polyamide precipitation fiber which can be used for aramid fiber paper preparation. The aromatic polyamide precipitation fiber prepared by the method has a certain melting point, and the melting point is higher than 340 DEG C; the preparation process is simple, no filtering procedure needs to be implemented after neutralizing, and shear forming is directly performed; the shape of the finished product can be accurately controlled, thereby avoiding the production of thick and big fibers; and the prepared precipitation fiber can favorably improve and enhance the compaction degree of aramid fiber paper.

Description

technical field [0001] The invention relates to insulating materials, in particular to a high-melting-point ternary aromatic polyamide polymer and a method for preparing precipitated fibers using it. Background technique [0002] Polyamide precipitated fiber, commonly known as aramid paper, is one of the fields where aromatic polyamide polymers are used in a large amount. At present, nearly 15,000 tons of aromatic polyamide polymers are used in the production of aramid paper worldwide. The aramid fiber paper prepared by the material has excellent high temperature resistance and insulation properties, and can be widely used in various electrical insulation materials. [0003] Although aramid paper prepared from aromatic polyamide polymers has good high temperature resistance and insulation properties, typical aromatic polyamide polymers (such as meta-aramid and para-aramid) have no melting point, making The withstand voltage performance of the final prepared aramid paper wit...

AI Technical Summary

Problems solved by technology

However, the high-melting point aromatic polyamide polymer obtained by this preparation method contains a large amount of hydrochloric acid product, which needs to be neutralized before use.