CN111471325A

CN111471325A - Method for improving fluidity of titanium dioxide for chinlon chemical fiber

Info

Publication number: CN111471325A
Application number: CN202010390643.7A
Authority: CN
Inventors: 王彦华; 章圣苗; 夏浙安
Original assignee: East China University of Science and Technology
Current assignee: East China University of Science and Technology
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-07-31

Abstract

A method for improving the fluidity of titanium dioxide for nylon chemical fibers is characterized by comprising the following steps: the preparation method comprises the steps of firstly preparing a flowing modifier aqueous solution, preparing aqueous slurry before drying the nylon chemical fiber titanium dioxide according to the preparation method of the nylon chemical fiber titanium dioxide disclosed by the prior patent, drying the aqueous slurry by adopting centrifugal spray drying equipment, atomizing the slurry into small droplets under the action of an atomizing head of a rotary atomizer, uniformly installing pressure atomizing nozzles around the rotary atomizer, atomizing the flowing modifier into small droplets by the pressure atomizing nozzles, rapidly adsorbing and coating the small droplets of the flowing modifier on the surface of spherical particles of the titanium dioxide, wherein the spherical particles of the titanium dioxide coated with the dimethyl silicone oil on the surface are not easily adsorbed on the surfaces of equipment and pipelines, and have good fluidity.

Description

Method for improving fluidity of titanium dioxide for chinlon chemical fiber

Technical Field

The invention relates to a method for improving the fluidity of titanium dioxide in nylon chemical fiber.

Background

[0002] The chemical fiber titanium dioxide is added into chemical fibers and artificial fibers to play a role in extinction, and the chemical fiber titanium dioxide enables the surfaces of the fibers not to be reflective and the fibers not to be transparent and improves the dyeing property, the hand feeling and the like of the fibers, so that the titanium dioxide is an essential additive for the extinction fibers.

The application range is as follows: terylene, viscose, acrylic and nylon, etc. 80% of polyester, 7-8% of viscose fiber, 7-8% of acrylon, 7-8% of chinlon and the like.

Production and consumption conditions: the total consumption of the chemical fiber titanium white in the world is 7-8 ten thousand tons/year, the domestic consumption is 1.8-2.5 ten thousand tons/year, and the main manufacturers are Germany Sha Harry chemical company, Japan Fuji titanium company, Japan titanium industry company and Germany Kronos company, the yield distribution condition is as follows: 3 to 4 ten thousand tons/year by Shahara chemical company, 2 to 3 ten thousand tons/year by Fuji titanium company, 0.8 to 1.0 ten thousand tons/year by titanium industries company, and 0.8 to 1.0 ten thousand tons/year by Kronos company.

Chinese patent CN201910573992.X discloses a titanium dioxide matting agent for low-cost polyamide fiber, and preparation and application thereof. The matting agent comprises anatase phase titanium dioxide of a nuclear layer, an amorphous silicon coating layer and an amorphous aluminum coating layer which are sequentially coated on the surface of the anatase phase titanium dioxide of the nuclear layer, and an outermost anionic surfactant modification layer. The preparation method comprises the following steps: preparing an amorphous silicon coating layer and an amorphous aluminum coating layer on the surface of anatase titanium dioxide ultrafine powder in sequence, and then carrying out organic modification through an anionic surfactant. The method improves the utilization rate of the expensive aluminum modifier by 12.9 percent by preparing the amorphous silicon coating layer; the grafting rate of the anionic surfactant is improved by 3 times by preparing the aluminum coating layer; the method has mild reaction conditions, is suitable for large-scale and continuous industrial production, and effectively reduces the process cost.

Chinese patent CN201910559372.0 discloses a preparation method of titanium dioxide special for high-performance color master batch, which comprises seven steps of mixing and pulping, primary homogenization, secondary homogenization, alkali liquor preparation, water washing, flash evaporation drying, steam powder molding and the like. On one hand, in the method, a stable and compact tetrahedral aluminum phosphate structure is formed by a special surface treatment mode in the coating process to replace the conventional aluminum hydroxide structure, so that the content of combined water and free water in an aluminum film is reduced, the film tearing phenomenon at high processing temperature is avoided, and the technical difficulties of the anti-cracking property of the color master batch and the washing thixotropy are broken through; meanwhile, the special coating mode can also provide better light resistance and covering power; on the other hand, the quick water washing can be realized, the filter cake is not sticky and thixotropic, and the production efficiency is improved.

The invention relates to a method for improving the fluidity of titanium dioxide in nylon chemical fiber, which is characterized by comprising the following steps: firstly, preparing a flowing modifier aqueous solution, adding 1 part of dimethyl silicone oil and 0.1 part of lauryl polyoxyethylene sodium sulfate into 100 parts of deionized water, and stirring and dispersing for 30 minutes for later use; the water-based slurry before drying of the nylon chemical fiber titanium dioxide prepared by the preparation method of the nylon chemical fiber titanium dioxide disclosed by the prior patent has the solid content of 50-60%, the water-based slurry is dried by adopting centrifugal spray drying equipment, the water-based slurry with the solid content of 50-60% is sent into a rotary atomizer, the rotating speed of an atomizing head of the rotary atomizer is 20000 revolutions per minute, the slurry is atomized into small liquid drops under the action of the atomizing head of the rotary atomizer, the hot air inlet temperature of the spray drying equipment is 350 ℃, the moisture of the small liquid drops is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles, and the exhaust temperature of the spray drying equipment is 120 ℃; 6-8 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the prepared flow modifier is pressurized to 1MPa through a pressure pump and is sent into the pressure atomizing nozzles, the pressure atomizing nozzles atomize the flow modifier into small droplets, the small droplets of the flow modifier are quickly adsorbed to the surface of titanium dioxide slurry droplets, and the titanium dioxide slurry droplets are dried and coated on the surface of titanium dioxide particles together, and the titanium dioxide spherical particles coated with the dimethyl silicone oil on the surface are not easy to adsorb on the surfaces of equipment and pipelines, and have good fluidity.

Disclosure of Invention

A method for improving the fluidity of titanium dioxide for nylon chemical fibers is characterized by comprising the following steps: firstly, preparing a flowing modifier aqueous solution, adding 1 part of dimethyl silicone oil and 0.1 part of lauryl polyoxyethylene sodium sulfate into 100 parts of deionized water, and stirring and dispersing for 30 minutes for later use; the water-based slurry before drying of the nylon chemical fiber titanium dioxide prepared by the preparation method of the nylon chemical fiber titanium dioxide disclosed by the prior patent has the solid content of 50-60%, the water-based slurry is dried by adopting centrifugal spray drying equipment, the water-based slurry with the solid content of 50-60% is sent into a rotary atomizer, the rotating speed of an atomizing head of the rotary atomizer is 20000 revolutions per minute, the slurry is atomized into small liquid drops under the action of the atomizing head of the rotary atomizer, the hot air inlet temperature of the spray drying equipment is 350 ℃, the moisture of the small liquid drops is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles, and the exhaust temperature of the spray drying equipment is 120 ℃; 6-8 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the prepared flow modifier is pressurized to 1MPa through a pressure pump and is sent into the pressure atomizing nozzles, the pressure atomizing nozzles atomize the flow modifier into small droplets, the small droplets of the flow modifier are quickly adsorbed to the surface of titanium dioxide slurry droplets, and the titanium dioxide slurry droplets are dried and coated on the surface of titanium dioxide particles together, and the titanium dioxide spherical particles coated with the dimethyl silicone oil on the surface are not easy to adsorb on the surfaces of equipment and pipelines, and have good fluidity.

By controlling the feeding amount of the chinlon chemical fiber titanium dioxide sizing agent and the feeding amount of the flowing modifier water solution, the ratio of the absolute dry weight of the dimethyl silicone oil to the absolute dry weight of the chinlon chemical fiber titanium dioxide is 1000: 1.

Detailed Description

Example 1

Adding 10 kg of dimethyl silicone oil and 1 kg of sodium dodecyl polyoxyethylene sulfate into 1000 kg of deionized water, and stirring and dispersing for 30 minutes to prepare a fluidity modifier aqueous solution for later use; drying by adopting centrifugal spray drying equipment, wherein the rotating speed of an atomizing head of a rotary atomizer is 20000 revolutions per minute, the hot air inlet temperature of the spray drying equipment is 350 ℃, the nylon chemical fiber titanium dioxide aqueous slurry with the solid content of 50% is conveyed to the rotary atomizer by a metering pump, the flow of the nylon chemical fiber titanium dioxide aqueous slurry is 1200 kg/h, and the moisture of small droplets is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles; 6 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the flowing modifier is pressurized to 1MPa by a pressure pump and is sent into the pressure atomizing nozzles, the flow of the aqueous solution of the flowing modifier is 60 kg/h, small droplets of the flowing modifier are rapidly adsorbed to the surface of titanium dioxide slurry droplets under the action of hot air, and the small droplets and the titanium dioxide slurry droplets are dried together and coated on the surface of titanium dioxide particles.

Example 2

Adding 10 kg of dimethyl silicone oil and 1 kg of sodium dodecyl polyoxyethylene sulfate into 1000 kg of deionized water, and stirring and dispersing for 30 minutes to prepare a fluidity modifier aqueous solution for later use; drying by adopting centrifugal spray drying equipment, wherein the rotating speed of an atomizing head of a rotary atomizer is 20000 revolutions per minute, the hot air inlet temperature of the spray drying equipment is 350 ℃, chinlon chemical fiber titanium dioxide aqueous slurry with the solid content of 60% is conveyed to the rotary atomizer by a metering pump, the flow of the chinlon chemical fiber titanium dioxide aqueous slurry is 1200 kg/h, and the moisture of small droplets is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles; 8 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the flowing modifier is pressurized to 1MPa through a pressure pump and is sent into the pressure atomizing nozzles, the flow of the aqueous solution of the flowing modifier is 72 kg/h, small droplets of the flowing modifier are rapidly adsorbed to the surface of titanium dioxide slurry droplets under the action of hot air, and the small droplets and the titanium dioxide slurry droplets are dried together and coated on the surface of titanium dioxide particles.

Example 3

Adding 10 kg of dimethyl silicone oil and 1 kg of sodium dodecyl polyoxyethylene sulfate into 1000 kg of deionized water, and stirring and dispersing for 30 minutes to prepare a fluidity modifier aqueous solution for later use; drying by adopting centrifugal spray drying equipment, wherein the rotating speed of an atomizing head of a rotary atomizer is 20000 revolutions per minute, the hot air inlet temperature of the spray drying equipment is 350 ℃, the nylon chemical fiber titanium dioxide aqueous slurry with the solid content of 55% is conveyed to the rotary atomizer by a metering pump, the flow of the nylon chemical fiber titanium dioxide aqueous slurry is 1200 kg/h, and the moisture of small droplets is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles; 6 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the flowing modifier is pressurized to 1MPa by a pressure pump and is sent into the pressure atomizing nozzles, the flow of the aqueous solution of the flowing modifier is 66 kg/h, small droplets of the flowing modifier are quickly adsorbed to the surface of titanium dioxide slurry droplets under the action of hot air, and the small droplets and the titanium dioxide slurry droplets are dried together and coated on the surface of titanium dioxide particles.

Example 4

Adding 10 kg of dimethyl silicone oil and 1 kg of sodium dodecyl polyoxyethylene sulfate into 1000 kg of deionized water, and stirring and dispersing for 30 minutes to prepare a fluidity modifier aqueous solution for later use; drying by adopting centrifugal spray drying equipment, wherein the rotating speed of an atomizing head of a rotary atomizer is 20000 revolutions per minute, the hot air inlet temperature of the spray drying equipment is 350 ℃, chinlon chemical fiber titanium dioxide aqueous slurry with the solid content of 52% is conveyed to the rotary atomizer by a metering pump, the flow of the chinlon chemical fiber titanium dioxide aqueous slurry is 1200 kg/h, and the moisture of small droplets is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles; 8 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the flowing modifier is pressurized to 1MPa through a pressure pump and is sent into the pressure atomizing nozzles, the flow of the aqueous solution of the flowing modifier is 62 kg/h, small droplets of the flowing modifier are rapidly adsorbed to the surface of titanium dioxide slurry droplets under the action of hot air, and the small droplets and the titanium dioxide slurry droplets are dried together and coated on the surface of titanium dioxide particles.

Example 5

Adding 10 kg of dimethyl silicone oil and 1 kg of sodium dodecyl polyoxyethylene sulfate into 1000 kg of deionized water, and stirring and dispersing for 30 minutes to prepare a fluidity modifier aqueous solution for later use; drying by adopting centrifugal spray drying equipment, wherein the rotating speed of an atomizing head of a rotary atomizer is 20000 revolutions per minute, the hot air inlet temperature of the spray drying equipment is 350 ℃, chinlon chemical fiber titanium dioxide aqueous slurry with the solid content of 58% is conveyed to the rotary atomizer by a metering pump, the flow of the chinlon chemical fiber titanium dioxide aqueous slurry is 1200 kg/h, and the moisture of small droplets is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles; 8 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the flowing modifier is pressurized to 1MPa by a pressure pump and is sent into the pressure atomizing nozzles, the flow of the aqueous solution of the flowing modifier is 70 kg/h, small droplets of the flowing modifier are quickly adsorbed to the surface of titanium dioxide slurry droplets under the action of hot air, and the small droplets and the titanium dioxide slurry droplets are dried together and coated on the surface of titanium dioxide particles.

Example 6

Adding 10 kg of dimethyl silicone oil and 1 kg of sodium dodecyl polyoxyethylene sulfate into 1000 kg of deionized water, and stirring and dispersing for 30 minutes to prepare a fluidity modifier aqueous solution for later use; drying by adopting centrifugal spray drying equipment, wherein the rotating speed of an atomizing head of a rotary atomizer is 20000 revolutions per minute, the hot air inlet temperature of the spray drying equipment is 350 ℃, the nylon chemical fiber titanium dioxide aqueous slurry with the solid content of 56% is conveyed to the rotary atomizer by a metering pump, the flow of the nylon chemical fiber titanium dioxide aqueous slurry is 1200 kg/h, and the moisture of small droplets is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles; 6 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the flowing modifier is pressurized to 1MPa through a pressure pump and is sent into the pressure atomizing nozzles, the flow of the aqueous solution of the flowing modifier is 67 kg/h, small droplets of the flowing modifier are rapidly adsorbed to the surface of titanium dioxide slurry droplets under the action of hot air, and the small droplets and the titanium dioxide slurry droplets are dried together and coated on the surface of titanium dioxide particles.

Claims

1. A method for improving the fluidity of titanium dioxide for nylon chemical fibers is characterized by comprising the following steps: firstly, preparing a flowing modifier aqueous solution, adding 1 part of dimethyl silicone oil and 0.1 part of lauryl polyoxyethylene sodium sulfate into 100 parts of deionized water, and stirring and dispersing for 30 minutes for later use; the water-based slurry before drying of the nylon chemical fiber titanium dioxide prepared by the preparation method of the nylon chemical fiber titanium dioxide disclosed by the prior patent has the solid content of 50-60%, the water-based slurry is dried by adopting centrifugal spray drying equipment, the water-based slurry with the solid content of 50-60% is sent into a rotary atomizer, the rotating speed of an atomizing head of the rotary atomizer is 20000 revolutions per minute, the slurry is atomized into small liquid drops under the action of the atomizing head of the rotary atomizer, the hot air inlet temperature of the spray drying equipment is 350 ℃, the moisture of the small liquid drops is rapidly evaporated under the action of hot air to finally become spherical titanium dioxide particles, and the exhaust temperature of the spray drying equipment is 120 ℃; 6-8 pressure atomizing nozzles are uniformly arranged around the rotary atomizer, the prepared flow modifier is pressurized to 1MPa through a pressure pump and is sent into the pressure atomizing nozzles, the pressure atomizing nozzles atomize the flow modifier into small droplets, the small droplets of the flow modifier are quickly adsorbed to the surface of titanium dioxide slurry droplets, and the titanium dioxide slurry droplets are dried and coated on the surface of titanium dioxide particles, and the titanium dioxide spherical particles coated with the dimethyl silicone oil on the surface are not easy to adsorb on the surfaces of equipment and pipelines, and have good fluidity;