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Inorganic/organic dispersant and application thereof

a technology of inorganic/organic dispersant and dispersant, applied in the field of i/o (inorganic/organic) dispersant, can solve the problem of unstable dispersant with aggregation, and achieve the effect of dispersing nanoparticles of metal oxid

Inactive Publication Date: 2009-06-11
NAT TAIWAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The object of the present invention is to provide an I / O dispersant, which can effectively disperse nanoparticles of a metal oxide.
[0009]Another object of the present invention is to provide a method for dispersing nanoparticles of a metal oxide by applying the aforementioned I / O dispersant, so that the nanoparticles can be uniformly dispersed.

Problems solved by technology

For application of TiO2 in commercial articles and industrial processes, it's always a technical issue to efficiently disperse TiO2 particles or powders into a solvent.
Once the dispersant is desorbed or isolated from the surfaces of the TiO2 particles, the dispersant will be unstable with aggregation.

Method used

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  • Inorganic/organic dispersant and application thereof
  • Inorganic/organic dispersant and application thereof
  • Inorganic/organic dispersant and application thereof

Examples

Experimental program
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Effect test

example 1

[0026]Step (a): Na+-montmorillonite (MMT) (10 g) is first dispersed in water (1 L) at 80° C. and then vigorously stirred for 4 hours to obtain a stable earth-colored dispersion.

[0027]Step (b): The polyoxypropylene diamine of Mw 2000 (D2000) (24 g, 12 mmol, CEC ratio of D2000 / MMT=1.0) is dissolved in ethanol (100 ml), and equivalent moles of hydrochloric acid is added therein for acidification for 30 minutes. The acidified intercalation solution is added to the Na+-MMT dispersion slowly and stirred at 60˜70° C. for 6 hours for a cation exchanging reaction. Then the resultant reaction solution is separated into two phases. After filtration, the residual is washed with water for several times to remove the unreacted organics and the inorganic clay. The synthesized product (D2000 / MMT hybrid) was analyzed to have an organic / inorganic weight ratio 74 / 26 and can be further dried in a vacuum oven at high temperature for 24 hours.

example 4

[0029]Step (a): Na+-MMT (10 g) is first dispersed in water (10 L) at 80° C. and then vigorously stirred for 4 hours to obtain a stable earth-colored dispersion.

[0030]Step (b): P-cresol (27.2 g) and D2000 (757.6 g) are weighted with a molar ratio 2:3 and circulated in toluene at 90° C. for 3 hours. Then a formaldehyde solution (37 wt %, 61.4 g) is added and the temperature is raised to 130° C. for reaction for 5 hours. When a gel is formed, the reaction is stopped and the product, an intercalating agent AMO (Amine-termination Mannich Oligomer), can be obtained. The AMO is analyzed with GPC and three peaks are found at Mw=3,142, 6,221 and 9,246, respectively. Results of amino titration are that primary amine=0.4 meq / g, secondary amine=0.56 meq / g, and no tertiary amine is found. Then the AMO is dissolved into water (575 g) and mixed with concentrated hydrochloric acid (35 wt %, 36 g) at 80° C. for 30 minutes to acidify the AMO. The acidified AMO is poured into the above Na+-MMT dispers...

example 5

[0036]Repeat Step (a) and Step (f) of Example 4, but NSP is replaced with MMT in Step (f). Then the product (ODA / MMT) with an organic / inorganic weight ratio 70 / 30 is obtained.

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Abstract

The present invention discloses an inorganic / organic mixed component (I / O) dispersant and applications thereof, which is primarily applied to dispersing nanoparticles of metal oxides. The I / O dispersant of the present invention can be a composite of inorganic clay and an organic surfactant, a composite of inorganic clay and polyoxyalkylene-amine, or a composite of inorganic clay, polyisobutylene succinic anhydride (PIB-SA) and hydrochloric acid salt or tetraalkyl quaternary salt of polyoxyalkylene-amine, or fatty amines. By mixing with the I / O dispersant of the present invention, nanoparticles of a metal oxide can be uniformly dispersed without aggregation particularly at high solid content. The dispersion has a lower viscosity and is relatively stable in storage even at high temperature.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an I / O (inorganic / organic) dispersant and applications thereof, and particularly to an I / O dispersant which is applied to dispersing nanoparticles of metal oxides, for example, white pigment and photocatalyst made from TiO2.[0003]2. Related Prior Arts[0004]For application of TiO2 in commercial articles and industrial processes, it's always a technical issue to efficiently disperse TiO2 particles or powders into a solvent. Different sizes of TiO2 can be applied to different fields, for example, nanoparticles of TiO2 can be used as photocatalysts, microparticles of TiO2 can be used as paints.[0005]The well known method for dispersing TiO2 consists in adding a general organic surfactant or a polymeric dispersant. The surfactant or dispersant primarily includes different segments with respective affinities to the solvent and the dispersed particles, so that the dispersant can be effectively ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01F3/18
CPCB01F17/005B01F17/0007C09K23/002C09K23/16
Inventor LIN, JIANG-JENHSU, YEN-CHICHIANG, MING-LICHU, CHIEN-CHIA
Owner NAT TAIWAN UNIV
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