Continuous production device for poly-p-phenylene terephthamide resin

Abstract

The invention provides a continuous production device for a poly-p-phenylene terephthamide resin, which belongs to the field of high molecular materials and relates to a high molecular material manufacturing technology. The continuous production device is characterized by comprising a p-phenylenediamine melt and solvent mixing and cooling device, a pre-polycondensation double-screw reactor, a combined second-order polycondensation double-screw reactor and a water washing device. After the continuous production device provided by the invention is used, the p-phenylenediamine and paraphthaloyl chloride are both fed as melts, so that continuous measurement errors are reduced and degrees of influences of flow fluctuation and solvent concentration on the mol ratio of the p-phenylenediamine and the paraphthaloyl chloride are reduced; and the obtained poly-p-phenylene terephthamide resin has the advantages of stable mass, narrow molecular weight distribution and low ash content and is suitable for industrially and continuously preparing the poly-p-phenylene terephthamide resin on a large-scale.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to the preparation technology of polymer materials. To be precise, it relates to a continuous production device of poly-p-phenylene terephthalamide resin. Background technique [0002] Poly-p-phenylene terephthalamide fiber is also called para-aramid fiber. Para-aramid is the most widely used and most demanded organic fiber among the three high-performance fibers in the world today. Para-aramid is the material industry Known as "Variable King Kong", it has a wide range of uses and is the first choice for manufacturing high-strength lightweight armor and special protective materials. It is widely used in aerospace, aviation, military industry, electromechanical, construction, automobiles, sporting goods and other fields. [0003] The quality of poly-p-phenylene terephthalamide fiber has a great correlation with the quality of poly-p-phenylene terephthalamide resin. Only poly-p-phenyle...

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Problems solved by technology

[0004] U.S. Patents USP3850888, USP3884881, Chinese Patents CN 1687186A, CN10155023A disclose the method for continuously preparing poly-p-phenylene terephthalamide resin, but neither discloses its production device; Chinese Patent CN 102206339A discloses continuously preparing poly-p-phenylene terephthalamide The method for formamide p-phenylenediamine resin also discloses its production device simultaneously, but this device adopts the powdered p-phenylenediamine feeding mode when feeding p-phenylenediamine, and the measurement error is relatively large, and it is different from p-phenylenediamine When acid chlorides are mixed, it is difficult to achieve the effect of instant mixing and uniformity. In addition, the device sets a mixing tank between the No. 1 twin-screw reactor and the No. 2 twin-screw reactor, which increases the difficulty of controlling the residence time of materials. If the residence time is not controlled correctly, the material will solidify in the mixing tank and block the pipeline

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