Polymerization formula, method and equipment for polycaprolactam and functional additive polymerization reaction device of polymerization equipment

Abstract

The invention relates to a polymerization formula, method and equipment for polycaprolactam. The technical scheme is that the polymerization formula of polycaprolactam comprises caprolactam as a raw material as well as functional additives, wherein the functional additives comprise a matting additive, a light-heat-resistant stabilizing additive and a molecular weight stabilizing additive; the matting additive is a prepared titanium dioxide suspension; the light-heat-resistant stabilizing additive is a liquid prepared from 3%-10% of 2,2,6,6-tetramethylpiperidine, 1%-2% of water and 70%-86% of caprolactam; the molecular weight stabilizing additive is a liquid prepared from 80% of caprolactam, 2% of water, 6% of terephthalic acid and 2% of a nylon multifunctional stabilizer; the titanium dioxide suspension is prepared from 15%-25% of titanium dioxide and 60%-75% of desalted water. With adoption of the technical scheme, the polymerization method and equipment for polycaprolactam are provided and have the advantages that crystals existing during processing are reduced or eliminated, production cost is reduced, and product processing quality is guaranteed.

Description

technical field [0001] The invention relates to the field of nylon chip processing, in particular to a polycaprolactam polymerization formula, a polymerization method, polycaprolactam polymerization equipment and a functional additive polymerization reaction device. Background technique [0002] At present, the process used to produce nylon 6 chips (polycaprolactam) at home and abroad mainly adopts two-stage continuous hydrolysis polymerization, and the foreign process equipment mainly uses two-stage continuous hydrolysis polymerization and one-stage continuous hydrolysis polymerization. [0003] Before 2000, the functional additives used in the formulation of high-speed spinning matting chip technology at home and abroad mainly include: TIO2 for matting, acids such as acetic acid and benzoic acid for controlling molecular weight. With the improvement of the efficiency of spinning equipment and the requirements of downstream products, higher requirements have been put forwar...

AI Technical Summary

Problems solved by technology

As a result, the service life of the melt filter is shortened, and the length is different, the shortest is ten days, and the longest is 3 months. Sometimes the melt filter reaches a speed of 2-4Kg per hour in a short period of time. Due to frequent replacement of the melt filter element , not only cause high cost and pollute the environment, but also may cause the product to be unqualified due to the filter element cleaning is not clean, the air in the filter cylinder when switching, and the filter element breaks down and ruptures due to too fast boosting,

[0005] Unqualified products will shorten the cycle of spinning main parts in the downstream use, and the spinning group will be replaced within 3-10 days, and the spinning yarn will be seriously broken at the same time

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