Titanium dioxide suspension for chinlon polymerization and preparation method thereof

A technology of titanium dioxide and suspension, which is applied in the field of nylon preparation, can solve the problems of short switching period of melt filter, decreased spinnability of slices, and decreased heat exchange efficiency, and achieves less impact, stable pressure difference, and improved stability. Effect

Inactive Publication Date: 2019-05-21
浙江恒逸锦纶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since titanium dioxide is a polar metal oxide, it can achieve an ideal dispersion state in caprolactam aqueous solution, but it is very easy to reunite after dispersion, which has an adverse effect on polymerization production. The most direct consequence is the short switching period of the melt filter or clogging and slicing. The spinnability is reduced, and at the same time, titanium dioxide deposits and scales on the walls of the polymer tubes, resulting in a decrease in heat exchange efficiency and an increase in energy consumption

Method used

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  • Titanium dioxide suspension for chinlon polymerization and preparation method thereof
  • Titanium dioxide suspension for chinlon polymerization and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Mix titanium dioxide powder, caprolactam aqueous solution with a mass fraction of 45%, and hexamethylenediamine with a caprolactam mass ratio of 8% in a mixer to make a 22% titanium dioxide suspension, which is centrifuged, ground and prepared for nylon polymerization production After 40 days of use, the temperature difference between the inside and outside of the upper section of the polymer tube is 1.7°C, the fouling of the polymer tube has improved significantly, and the spinnability of the slices is good. The above-mentioned titanium dioxide suspension for nylon polymerization was sampled and left to stand for 78 hours, and no delamination was observed.

Embodiment 2

[0027] Titanium dioxide powder, mass fraction is 45% caprolactam aqueous solution, and caprolactam mass ratio is 5% hexamethylenediamine, sodium hexametaphosphate is 0.05% dispersant and mixes in mixer, makes 22% titanium dioxide suspension, After centrifugation, grinding and blending, it is used for nylon polymerization production. According to production tracking, the pressure of the melt filter is stable during the production process. After 40 days of use, the temperature difference between the inside and outside of the upper section of the polymerization tube is 1.6°C, and the spinnability of the slices is good. The above-mentioned titanium dioxide suspension for nylon polymerization was sampled and left to stand for 90 hours, and no delamination was seen.

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Abstract

The invention relates to the field of chinlon preparation, and discloses a titanium dioxide suspension for chinlon polymerization and a preparation method thereof. The titanium dioxide suspension is prepared from titanium dioxide, caprolactam, diamine modifier and water. The diamine modifier is added while titanium dioxide and a caprolactam water solution are mixed, amino acids of the diamine modifier can be bonded with carboxyl on the titanium dioxide through chemical bonds, meanwhile, other amino acids of diamine and carboxyl in caprolactam can be bonded through chemical bonds, and thereforecrosslinking points are formed between the titanium dioxide and caprolactam, the bonding force between the titanium dioxide and caprolactam is increased, and the suspension has the advantages that the dispersed stability of titanium dioxide can be improved, agglomeration generation is relieved, and impact generated by polymerization is smaller. Meanwhile, due to the fact that little deposition condition is caused after the reaction type titanium dioxide suspension enters a polymerization pipe nest, the scaling condition is obviously improved.

Description

technical field [0001] The invention relates to the field of nylon preparation, in particular to a titanium dioxide suspension for nylon polymerization and a preparation method thereof. Background technique [0002] Titanium dioxide is widely used as a matting agent in the production of polymers. Usually, titanium dioxide is uniformly mixed with polymerized monomers or their aqueous solutions at a certain concentration, and then sent to a polymerization device for polymerization to obtain a matting polymer. The Chinese patent with the application number CN104313722A discloses a method for preparing titanium dioxide suspension, including the preparation of caprolactam aqueous solution, the preparation of titanium dioxide suspension, the centrifugal separation of titanium dioxide suspension, the deployment of titanium dioxide suspension and the recycling of crude titanium dioxide. The preparation of titanium dioxide is obtained by mixing titanium dioxide and caprolactam aqueou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F1/10D01F6/90
Inventor 何宁艳
Owner 浙江恒逸锦纶有限公司
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