Method for alleviating scaling of pre-polymerization tower

Abstract

The present invention relates to the field of fiber polymerization, and especially relates to a method for alleviating scaling of a pre-polymerization tower. The method comprises the steps of raw material preparation, pre-polymerization reaction, final polymerization reaction, dicing, extraction and drying. The raw material preparation comprises preparation of titanium dioxide preparation liquid,and is characterized in that a titanium dioxide delustering agent adopted by the titanium dioxide preparation liquid is modified titanium dioxide, the titanium dioxide delustering agent structurally comprises titanium dioxide particles and a composite layer coating the titanium dioxide particles, and the composite layer sequentially comprises an inorganic silicon compound layer, a metal compound layer and an organic polymer coating layer from inside to outside. The titanium dioxide delustering agent adopted in the method has good compactness, can improve the scaling phenomenon, is good in dispersibility and can alleviate the scaling phenomenon in the polymerization tower.

Description

technical field [0001] The invention relates to the field of fiber polymerization, in particular to a method for alleviating scaling of a prepolymerization tower. Background technique [0002] With the continuous development of the polyester industry around the world, the development of polyamide products has become increasingly competitive. In order to eliminate the luster of polyamide fibers, TiO is often added to the melt. 2 Matting agent. [0003] In the process of producing polymerized nylon chips, an appropriate amount of TiO is added 2 It mainly plays the role of extinction, making the slices look opaque, and after the downstream spinning and weaving into cloth, it has the effect of shading on the cloth surface. However, TiO 2 The compound itself has particle coagulation and molecular agglomeration. In order to avoid TiO 2 Particle agglomeration caused by potential difference and prevention of TiO 2 photoactive and therefore requires TiO 2 The particle surface ...

AI Technical Summary

Problems solved by technology

The current coating methods generally include inorganic coating, organic coating and hybrid coating. Hybrid coating refers to the use of organic coating on the basis of inorganic coating, although it can make TiO 2 It has good performance and better dispersion at the same time, but in the actual production of nylon polymerization process, TiO under the existing coating method 2 The particle density is poor, and it is easy to condense under the temperature, pressure, acid, amine and other environmental conditions in the pre-polymerization tower, resulting in fouling in the polymerization tower

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