Inorganic/organic dispersant and application thereof

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.

1 . An inorganic/organic (I/O) dispersant for dispersing a metal oxide, comprising a composite of an inorganic clay and an organic surfactant, or a composite of inorganic clay and polyoxyalkylene-amine,
 wherein the organic surfactant is a cationic surfactant, a nonionic surfactant or an amphoteric surfactant; the inorganic clay is in the form of layers or sheets; and polyoxyalkylene-amine has a molecular weight of 200˜10,000.   
   
   
       2 . The I/O dispersant as claimed in  claim 1 , wherein the metal oxide is selected from the group consisting of SiO 2 , Fe 2 O 3 , Al 2 O 3 , ZrO, Ag 2 O and TiO 2 . 
   
   
       3 . The I/O dispersant as claimed in  claim 1 , wherein the organic surfactant is a fatty amine quaternary ammonium salt of C12˜C32, an HCl amine salt of C12˜C32, a tetraalkyl quaternary salt of C12˜C32, alkylphenol ethoxylate or fatty alcohol ethoxylate. 
   
   
       4 . The I/O dispersant as claimed in  claim 1 , wherein the organic surfactant and the inorganic clay has an organic/inorganic weight ratio of 10/90˜90/10. 
   
   
       5 . The I/O dispersant as claimed in  claim 1 , wherein the inorganic clay is natural clay of silicate and aluminum oxide, exfoliated clay, synthetic mica or synthetic nanoclay. 
   
   
       6 . The I/O dispersant as claimed in  claim 1 , wherein the polyoxyalkylene-amine is a Jeffamine® Amine series product of Huntsman Chemical Co. 
   
   
       7 . The I/O dispersant as claimed in  claim 1 , wherein the polyoxyalkylene-amine and the inorganic clay have a cation exchanging capacity ratio of 0.1˜1.0. 
   
   
       8 . The I/O dispersant as claimed in  claim 1 , wherein the polyoxyalkylene-amine and the inorganic clay have an organic/inorganic weight ratio of 55/45˜99/1. 
   
   
       9 . The I/O dispersant as claimed in  claim 1 , wherein the polyoxyalkylene-amine is selected from the group consisting of Jeffamine® diamine D-230, D-400, D-2000, D-4000 and ED-2003. 
   
   
       10 . The I/O dispersant as claimed in  claim 1 , wherein the composite of inorganic clay and polyoxyalkylene-amine further comprises polyisobutylene succinic anhydride (PIB-SA). 
   
   
       11 . A method for producing an inorganic/organic (I/O) dispersant for dispersing a metal oxide, comprising a step of reacting inorganic clay with an organic surfactant, or reacting inorganic clay with polyoxyalkylene-amine,
 wherein the organic surfactant is a cationic surfactant, a nonionic surfactant or an amphoteric surfactant; the inorganic clay is in the form of layers or sheets; and the polyoxyalkylene-amine has a molecular weight of 200˜10,000.   
   
   
       12 . The method as claimed in  claim 11 , wherein the metal oxide is selected from the group consisting of SiO 2 , Fe 2 O 3 , Al 2 O 3 , ZrO, Ag 2 O and TiO 2 . 
   
   
       13 . The method as claimed in  claim 11 , wherein the organic surfactant is a fatty amine quaternary ammonium salt of C12˜C32, an HCl amine salt of C12˜C32, a tetraalkyl quaternary salt of C12˜C32, alkylphenol ethoxylate or fatty alcohol ethoxylate. 
   
   
       14 . The method as claimed in  claim 11 , wherein the organic surfactant and the inorganic clay have an organic/inorganic weight ratio of 10/90˜90/10. 
   
   
       15 . The method as claimed in  claim 11 , wherein the inorganic clay is natural clay of silicate and aluminum oxide, exfoliated clay, synthetic mica or synthetic nanoclay. 
   
   
       16 . The method as claimed in  claim 11 , wherein the polyoxyalkylene-amine is a Jeffamine® Amine series product of Huntsman Chemical Co. 
   
   
       17 . The method as claimed in  claim 11 , wherein the polyoxyalkylene-amine and the inorganic clay have a cation exchanging capacity ratio of 0.1˜1.0. 
   
   
       18 . The method as claimed in  claim 11 , wherein the polyoxyalkylene-amine and the inorganic clay have an organic/inorganic weight ratio of 55/45˜99/1. 
   
   
       19 . The method as claimed in  claim 11 , wherein the polyoxyalkylene-amine is Jeffamine® diamine D-230, D-400, D-2000, D-4000 or ED-2003 of Huntsman Chemical Co. 
   
   
       20 . The method as claimed in  claim 11 , wherein polyisobutylene succinic anhydride (PIB-SA) is mixed with inorganic clay and polyoxyalkylene-amine in the step of reacting inorganic clay with polyoxyalkylene-amine. 
   
   
       21 . A method for dispersing nanoparticles of a metal oxide, comprising a step of mixing an inorganic/organic (I/O) dispersant and nanoparticles of the metal oxide,
 wherein the I/O dispersant is a composite of inorganic clay and an organic surfactant, or a composite of inorganic clay and polyoxyalkylene-amine,   wherein the organic surfactant is a cationic surfactant, a nonionic surfactant or an amphoteric surfactant; the inorganic clay is in the form of layers or sheets, and polyoxyalkylene-amine has a molecular weight of 200˜10,000.   
   
   
       22 . The method as claimed in  claim 21 , wherein the metal oxide is selected from the group consisting of SiO 2 , Fe 2 O 3 , Al 2 O 3 , ZrO, Ag 2 O, TiO 2 . 
   
   
       23 . The method as claimed in  claim 21 , wherein the organic surfactant is a fatty amine quaternary ammonium salt of C12˜C32, an HCl amine salt of C12˜C32, a tetraalkyl quaternary salt of C12˜C32, alkylphenol ethoxylate or fatty alcohol ethoxylate. 
   
   
       24 . The method as claimed in  claim 21 , wherein the organic surfactant and the inorganic clay have an organic/inorganic weight ratio of 10/90˜90/10. 
   
   
       25 . The method as claimed in  claim 21 , wherein the inorganic clay is natural clay of silicate and aluminum oxide, exfoliated clay, synthetic mica or synthetic nanoclay. 
   
   
       26 . The method as claimed in  claim 21 , wherein the polyoxyalkylene-amine is a Jeffamine® Amine series product of Huntsman Chemical Co. 
   
   
       27 . The method as claimed in  claim 21 , wherein the polyoxyalkylene-amine and the inorganic clay have a cation exchanging capacity ratio of 0.1˜1.0. 
   
   
       28 . The method as claimed in  claim 21 , wherein the polyoxyalkylene-amine and the inorganic clay have an organic/inorganic weight ratio of 55/45˜99/1. 
   
   
       29 . The method as claimed in  claim 21 , wherein the polyoxyalkylene-amine is Jeffamine® diamine D-230, D-400, D-2000, D-4000 or ED-2003 of Huntsman Chemical Co. 
   
   
       30 . The method as claimed in  claim 21 , wherein the composite of inorganic clay and polyoxyalkylene-amine is further mixed with polyisobutylene succinic anhydride (PIB-SA).