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Preparation method of matting agent titanium dioxide suspension for polymer

A technology of titanium dioxide and suspension, which is applied in the field of preparation of titanium dioxide suspension as a matting agent for polymers, which can solve the problems of high energy consumption and low grinding efficiency, and achieve the effect of strong dispersion and small damage

Active Publication Date: 2018-07-20
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

[0004] However, because the ball mill grinds completely by mechanical force to disintegrate the large particles of titanium dioxide, the grinding efficiency is low, the grinding time is as long as several hours, and the energy consumption is high.

Method used

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  • Preparation method of matting agent titanium dioxide suspension for polymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, titanium dioxide and water containing 45wt% caprolactam are dissolved in the mixer 1 to prepare a slurry containing about 12wt% or 22wt% of titanium dioxide. The median particle size is 0.589μm after testing. After the centrifuge 2 is processed, the small particle size titanium dioxide liquid Enter the blending tank 3, after the concentration is adjusted to 12% or 22%, it is sent to the polymerization device for use. After centrifugation, the slurry containing large particles of titanium dioxide (median particle size is 0.632μm) enters the ultrasonic processor 4 (ultrasonic oscillator) with frequency The median size of titanium dioxide after 10 min treatment at 53 KHz frequency was 0.537μm, and the slurry hue remained unchanged before and after the slurry was sent back to the tank for reuse.

Embodiment 2

[0049] The matting agent titanium dioxide powder is mixed with the aqueous solution containing 75wt% hexamethylene diamine adipate to form a 10wt% or 20wt% slurry. After centrifuge treatment, the small particle size titanium dioxide liquid enters the fine blending tank, and the concentration is adjusted to 10 wt. % Or 20 wt% and then sent to the polymerization device. After centrifugation, the slurry containing large particles of titanium dioxide enters the ultrasonic disperser and is treated at a frequency of 20KHz for 15 minutes, and then the slurry is returned to the preparation tank for reuse. The median size of titanium dioxide before and after treatment with ultrasonic disperser was tested to be 0.593μm and 0.564μm, and the color of the slurry remained unchanged before and after treatment.

Embodiment 3

[0051] The matting agent titanium dioxide powder is mixed with hexanediol to form a 50wt% slurry. After centrifuge treatment, the small particle size titanium dioxide liquid enters the fine mixing tank, and the concentration is adjusted to 10 wt% to be sent to the polymerization device for use. After centrifugal treatment, it contains large particles of titanium dioxide The slurry enters the ultrasonic disperser and is treated with a frequency of 20KHz for 15 minutes, and then the slurry is returned to the preparation tank for reuse. The median diameter of titanium dioxide before and after treatment with ultrasonic disperser was tested to be 0.509μm, and the color of the slurry was unchanged before and after treatment with 0.433μm.

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Abstract

The invention relates to the field of matting agents, and discloses a preparation method of a matting agent titanium dioxide suspension for a polymer. According to the invention, traditional mechanical grinding is replaced with an ultrasonic treatment way; separated large titanium dioxide particles are disintegrated into small particles under action of ultrasonic waves. The preparation method provided by the invention has the advantages of high treatment efficiency and lower energy consumption, and generally can achieve an effect of grinding for 2 h by only treating for 5-30 min so as to better meet needs of large-scale production; and moreover, ultrasonic treatment has less damage to titanium dioxide surface-modified covering layer than mechanical grinding treatment, and has little influence on a color value of a product.

Description

Technical field [0001] The invention relates to the field of matting agents, in particular to a method for preparing a titanium dioxide suspension of a matting agent for polymers. Background technique [0002] Titanium dioxide is widely used as a matting agent in polymer production. Generally, titanium dioxide is mixed uniformly with a polymerized monomer or its aqueous solution at a certain concentration, and then sent to a polymerization device for polymerization to obtain a matting polymer. In order to ensure the quality of the polymer, it is not only required that the particle size of the titanium dioxide meet the requirements, but also have good dispersibility and stability. Therefore, during the preparation of the titanium dioxide suspension, it is necessary to screen out the larger particle size titanium dioxide, and at the same time, to improve the utilization rate of titanium dioxide. The screened out titanium dioxide with a large particle size is re-used after being pro...

Claims

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Application Information

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IPC IPC(8): C08K9/00C08K9/10C08K3/22
CPCC08K3/22C08K9/00C08K9/10C08K2003/2241
Inventor 王松林陈庆何宁艳王迪
Owner 浙江恒逸锦纶有限公司
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