Surface modification method of inorganic pigments

An inorganic pigment and surface modification technology, applied in metal material coating process, gaseous chemical plating, coating and other directions, can solve the problems of large contact area and slow reaction, achieve high coating uniformity, reduce toxicity, The effect of dense structure

Active Publication Date: 2019-02-19
HUST WUXI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contact area of ​​this method is large and the reaction is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this example, the inorganic pigment iron oxide red with a particle size of about 20 μm is used for surface modification, and 1 nm of Al 2 o 3 Thin films and 5nm SiO 2 thin film as an example, where TMA, SiCl 4 with H 2 O is a precursor, and its main reaction equation is:

[0050] (A)AlOH*+Al(CH 3 ) 3 → AlOAl(CH 3 ) 2 *+CH 4

[0051] (B)AlCH 3 *+H 2 O → AlOH*+CH 4

[0052] (C)SiCl 4 +2H 2 O → SiO 2 +4HCl

[0053] Specifically include the following steps:

[0054] (1) Alumina coating:

[0055] 1.1 After ball milling the iron oxide red in a planetary mill with a rotational speed of 30r / min, weigh 10g and place it in the powder container of the atomic layer deposition equipment, put the powder container into the cavity, and pump air by adjusting the vacuum pump The flow to adjust the vacuum rate is 100Pa / s, vacuum to 1-5Pa.

[0056] 1.2 Heat the cavity, and at the same time, pass the carrier gas to clean the surface of the inorganic pigment for about...

Embodiment 2

[0071] In this example, titanium dioxide, an inorganic pigment with a particle size of about 30 μm, is used for surface modification and coated with 1 nm of Al 2 o 3 Thin films and 10nm ZnO 2 film as an example, where TMA, DMZn and H 2 O is a precursor, and its main reaction equation is:

[0072] (A)AlOH*+Al(CH 3 ) 3 → AlOAl(CH 3 ) 2 *+CH 4

[0073] (B)AlCH 3 *+H 2 O → AlOH*+CH 4

[0074] (C)Zn(CH 3 ) 2 * +H 2 O →ZnO*+2CH 4

[0075] Specifically include the following steps:

[0076] (1) Alumina coating:

[0077] 1.1 After ball milling titanium dioxide in a planetary mill with a rotational speed of 30r / min, weigh 50g and place it in the powder container of the atomic layer deposition equipment, put the powder container into the cavity, and adjust the vacuum pump to pump air Flow to adjust the vacuum rate to 100Pa / s, vacuum to 1-5Pa.

[0078] 1.2 Heat the cavity, and at the same time, pass the carrier gas to clean the surface of the inorganic pigment for abo...

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Abstract

The invention relates to a surface modification method of inorganic pigments and belongs to the technical field of modification of industrial inorganic pigments. The method comprises the following steps: carrying out ball milling and crushing of inorganic pigments, then placing the inorganic pigments in a powder atomic layer deposition device, selecting precursors moderate in activity and vapor pressure, alternately filling the precursors in the inorganic pigments, forming single-layer active adsorption on the surfaces of the inorganic pigments through exchange of active functional groups andcompleting self-limited chemical half-reaction to generate dense films, and coating all the parts of the surfaces with the films with uniform thickness. Through the method, nano films generated by atomic layer deposition are used for coating the inorganic pigments; the coating uniformity is high; the nano films are especially used for uniformly coating inorganic pigments with small particles; thenano films generated by atomic layer deposition are dense in structure, uniform in thickness and excellent in consistency; through the characteristics of reaction mechanisms of the nano films, the nano films can be used for coating the inorganic pigments with different particle sizes.

Description

technical field [0001] The invention relates to a method for surface modification of inorganic pigments, in particular to a method for surface modification of inorganic pigments by coating oxide nanoscale films, and belongs to the technical field of industrial inorganic pigment modification. Background technique [0002] The particle size of pigment particles is very small, generally below 100 μm, and modern pigments are developing towards ultra-fineness, even below 1 μm, so that the surface energy of the pigment is very high, the particles are easily agglomerated, and the dispersion is affected , which directly affects the performance of the pigment, so it is of great significance to improve its dispersion stability by surface modification. [0003] Because the surface properties of inorganic pigments are far from those of organic polymers, the compatibility is poor, and it is difficult to disperse evenly in the organic matrix. If they are used directly, the surface wettabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/455C23C16/44
CPCC23C16/402C23C16/407C23C16/4417C23C16/45527
Inventor 陈蓉张晶刘潇单斌曹坤
Owner HUST WUXI RES INST
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