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Preparation method for titanium dioxide used for extinction of chinlon chemical fibers

A technology of titanium dioxide and chemical fiber, applied in chemical instruments and methods, fibrous fillers, dyed low-molecular organic compound treatment, etc., can solve the blockage of three-effect evaporator tubes, spinning broken filaments, and heat exchange of three-effect evaporators Problems such as decline in effect

Active Publication Date: 2020-07-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing titanium dioxide for nylon chemical fiber matting is coated with hydrated silica and hydrated alumina, and the hydrated silica and hydrated alumina are coated to isolate the surface of titanium dioxide from water and oxygen in the air. Photocatalytic phenomenon, the problems of this coating method are: first, due to the existence of hydrated alumina, it will be reduced to aluminum by caprolactam, which will cause fouling on the surface of the heat exchanger tubes of the prepolymerization tower, affecting the heat exchange effect , the fouling will fall off automatically when it reaches a certain thickness, and the shedding will cause the subsequent spinning to break the filament when it enters the product, causing great losses
Second, due to the existence of hydrated silica, hydrated silica is easily washed down by the extraction water and enters the extraction water recovery system. In the extraction water recovery system, water is continuously evaporated, and the concentration of hydrated silica continues to increase, resulting in hydration oxidation. Silicon is adsorbed in the tubes of the three-effect evaporator, and the heat exchange effect of the three-effect evaporator decreases until the tubes of the three-effect evaporator are blocked, resulting in the inability to continue production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Disperse 2000kg of pigment-grade anatase titanium dioxide in 2000kg of deionized water, add 6kg of sodium polyacrylate dispersant at the same time, disperse with a high-speed disperser for 45 minutes to make a slurry; grind the slurry twice with a grinder, and then grind the slurry The material is transferred to the stirring tank, and 8000kg of deionized water is added to the slurry for dilution, and the diluted slurry is continuously sent to a horizontal screw unloading centrifugal classifier for classification to remove large particle materials and fine particle materials into the stirring tank. Heat the slurry to 80°C, add 8kg of antimony trichloride to the slurry under constant stirring, continue to stir for 30 minutes, slowly add 40kg of 10% sodium hydroxide to the slurry, and control the addition time at 3 hours; Add 120kg zirconium oxychloride octahydrate to the slurry under constant stirring, continue to stir for 30 minutes, slowly add 10% sodium hydroxide 300kg...

Embodiment 2

[0012] Disperse 2000kg of pigment-grade anatase titanium dioxide in 2000kg of deionized water, add 7kg of sodium polyacrylate dispersant at the same time, disperse with a high-speed disperser for 50 minutes to make a slurry; grind the slurry twice with a grinder, and then grind the slurry The material is transferred to the stirring tank, and 8000kg of deionized water is added to the slurry for dilution, and the diluted slurry is continuously sent to a horizontal screw unloading centrifugal classifier for classification to remove large particle materials and fine particle materials into the stirring tank. Heat the slurry to 80°C, add 12 kg of antimony trichloride to the slurry under constant stirring, continue stirring for 30 minutes, slowly add 60 kg of 10% sodium hydroxide to the slurry, and control the addition time to 3 hours; Add 150kg zirconium oxychloride octahydrate to the slurry under constant stirring, continue to stir for 30 minutes, slowly add 400kg of 10% sodium hy...

Embodiment 3

[0015] Disperse 2000kg of pigment-grade anatase titanium dioxide in 2000kg of deionized water, add 4kg of sodium polyacrylate dispersant at the same time, disperse with a high-speed disperser for 30 minutes to make a slurry; grind the slurry twice with a grinder, and then grind the slurry The material is transferred to the stirring tank, and 8000kg of deionized water is added to the slurry for dilution, and the diluted slurry is continuously sent to a horizontal screw unloading centrifugal classifier for classification to remove large particle materials and fine particle materials into the stirring tank. Heat the slurry to 80°C, add 10kg of antimony trichloride to the slurry under constant stirring, continue to stir for 30 minutes, slowly add 50kg of 10% sodium hydroxide to the slurry, and control the addition time to 3 hours; Add 130kg zirconium oxychloride octahydrate to the slurry under constant stirring, continue to stir for 30 minutes, slowly add 10% sodium hydroxide 350k...

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PUM

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Abstract

The invention provides a preparation method for titanium dioxide used for extinction of chinlon chemical fibers. The preparation method is characterized by comprising the following steps: dispersing pigment-grade anatase type titanium dioxide into a water slurry, carrying out grinding and diluting, and carrying out grading to remove large particles; then coating the surfaces of the titanium dioxide particles with antimony oxide and zirconium oxide hydrate; and treating the surfaces of the titanium dioxide particles subjected to inorganic coating by using pentaerythritol so as to obtain the titanium dioxide used for extinction of the chinlon chemical fibers.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide for nylon chemical fiber matting. Background technique [0002] The existing titanium dioxide for nylon chemical fiber matting is coated with hydrated silica and hydrated alumina, and the hydrated silica and hydrated alumina are coated to isolate the surface of titanium dioxide from water and oxygen in the air. Photocatalytic phenomenon, the problems of this coating method are: first, due to the existence of hydrated alumina, it will be reduced to aluminum by caprolactam, which will cause fouling on the surface of the heat exchanger tubes of the prepolymerization tower, affecting the heat exchange effect , The scale will fall off automatically when it reaches a certain thickness, and the shed matter entering the product will cause subsequent spinning and broken filaments, causing great losses. Second, due to the existence of hydrated silica, hydrated silica is easily washed down by the ...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/08C09C3/10
CPCC09C1/3661C09C1/3669C09C1/3676C09C1/3692C09C3/006C09C3/063C09C3/08C09C3/10
Inventor 王彦华夏浙安章圣苗
Owner EAST CHINA UNIV OF SCI & TECH