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Flyash-hollow-microsphere-based composite titanium white and preparation method thereof

A hollow microbead, composite titanium dioxide technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of difficult to control crystal form, lack of titanium dioxide pigment properties, environmental pollution, etc., and achieve improvement. The effect of thermal insulation

Inactive Publication Date: 2013-04-03
FUJIAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems, one is that the degree of hydrolysis is difficult to control; the other is that the precipitation of metatitanic acid generates TiO through subsequent calcination 2 , the crystal form is difficult to control; the third is that the hydrolysis of titanium salt produces a large amount of acidic wastewater, which causes serious pollution to the environment and high treatment costs
Moreover, the prepared composite powder is used as a filler of heat-insulating coatings to have the effect of heat-insulating and heat-preserving, and does not have the properties of titanium dioxide pigments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Add fly ash hollow microspheres (2500 mesh) into 0.75 mol / L NaOH solution, and magnetically stir at 70°C for 1 hour. During this process, the magnetic stirring rotor was taken out to remove the adsorbed iron, and repeated several times. Filter, wash to pH=8, and dry the filter cake. Weigh fly ash with a solid content of 35 wt%, mix it with water, add 0.5 wt% sodium silicate to the dry powder of fly ash, place it in a stirring tank equipped with grinding media, stir and grind. The grinding medium is spherical zirconia with a graded ratio (φ3mm:φ2mm:φ1mm=5:3:2), and the ball-to-material ratio is 3:1 (mass ratio); the grinding speed is 2000r / min; the grinding time is 30min.

[0024] Weigh TiO with a solid content of 35 wt% 2 A mixture of crystals and water, and adding 0.5 wt% of sodium silicate to dry powder, placed in a stirring tank, stirred at a stirring speed of 3000r / min for 20 minutes and ultrasonically treated for 10 minutes.

[0025] The above disperse...

Embodiment 2

[0026] Example 2: Add fly ash hollow microspheres (2500 mesh) into 0.5 mol / L NaOH solution, and other steps are the same as in Example 1. The hiding power of the obtained composite powder is 16.20 g / m 2 , the oil absorption value is 17.52g / 100g, and the whiteness is 78.1%; 2 The particle size of the fly ash hollow microspheres coated with crystals is 2500 mesh.

Embodiment 3

[0027] Example 3: Add fly ash hollow microspheres (2500 mesh) into 1.0 mol / L NaOH solution, and other steps are the same as in Example 1. The hiding power of the obtained composite powder is 16.06g / m 2 , the oil absorption value is 17.13g / 100g, and the whiteness is 78.12%; 2 The particle size of the fly ash hollow microspheres coated with crystals is 2600 mesh.

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Abstract

The invention discloses flyash-hollow-microsphere-based composite titanium white and a preparation method thereof. According to the preparation method, flyash hollow microspheres serve as inner cores, crystals TiO2 serve as coating powder, and the TiO2 can be coated on the surfaces of the flyash hollow microspheres through mechano-chemical action, so that composite titanium white can have the nature of pigment TiO2. The composite titanium white disclosed by the invention has the characteristics that the preparation process is simple, the TiO2 is uniformly coated on the surfaces of the flyash hollow microspheres and firmly bonded to the flyash hollow microspheres, the hiding power is high, the cost is low, and the like. The flyash-hollow-microsphere-based composite titanium white, as white pigment, can be applied to the fields of coatings, plastics, inks and the like in a manner that the flyash-hollow-microsphere-based composite titanium white partially substitutes titanium white. Furthermore, when the composite titanium white is applied to the coatings, the hollow heat conductivity coefficient of the flyash hollow microspheres is small, the TiO2 has a high reflection role on sunlight, and then, a complete hollow isolation layer is formed in a manner that the flyash hollow microspheres are closely arranged after a coating is dried, so that the composite titanium white has a good heat insulating effect. The flyash-hollow-microsphere-based composite titanium white has the nature of pigment and heat insulating and heat preservation roles.

Description

technical field [0001] The invention relates to the technical field of production of composite white pigments, in particular to fly ash hollow microspheres and TiO 2 Composite white pigment and method for its preparation. Background technique [0002] Titanium dioxide, that is, titanium dioxide pigment, has high hiding power, high color reduction power, high finish, high whiteness and strong weather resistance due to its superior density, dielectric constant and refractive index, and is also chemically inert and non-toxic. , Harmless to the human body and other properties, it is considered to be one of the best white pigments in the world, and is widely used in coatings, plastics, paper, printing inks, chemical fibers, rubber, cosmetics and other industries. With the development of the world economy, social progress and the improvement of people's living standards, the rapid development of construction and other industries has been driven, and the demand for titanium dioxid...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/04C09D7/02C09D7/45
Inventor 童跃进肖志红杨伟华关怀民乐兆鸿颜桂炀
Owner FUJIAN NORMAL UNIV
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