Method for preparing coated aluminum powder pigment

A coating type, aluminum powder technology, which is applied in the direction of fibrous filler, dyed organic silicon compound treatment, dyed low molecular organic compound treatment, etc., can solve the problems of aluminum powder pigment failure, protective layer falling off, protective effect, etc. Achieve good metallic luster, good acid and alkali resistance and water resistance, and good compatibility

Inactive Publication Date: 2017-01-11
刘从荡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing coating technology is difficult to form a dense protective layer on the surface of the aluminum powder pigment or the protective layer is easy to fall off from the surface of the aluminum powder pigment, which does not have a good protective effect on the aluminum powder pigment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the first step, in parts by mass, add 2 parts of aluminum powder pigment and 50 parts of solvent methanol in the reaction vessel, and stir at room temperature for 0.5 hour;

[0029] In the second step, add 1 part of aminopropyltriethoxysilane, 4 parts of water, and 2 parts of acidic catalyst hydrochloric acid into the reaction vessel described in the first step, heat in a water bath, and react for 2 hours under stirring. The reaction temperature is 30 ° C. The pH value is 5, and the aluminum powder pigment initially coated with organosiloxane is obtained;

[0030] The third step is to raise the temperature of the reaction system described in the second step to 65°C, add 3 parts of styrene, 0.01 part of initiator azobisisobutyronitrile, and react for 2 hours under stirring to obtain organosiloxane and polymer coating Aluminum powder pigment;

[0031] The fourth step is to cool the aluminum powder pigment suspension obtained in the third step to room temperature, and ...

Embodiment 2

[0033] In the first step, in parts by mass, add 6 parts of aluminum powder pigment and 70 parts of solvent ethanol in the reaction vessel, and stir at room temperature for 1 hour;

[0034] In the second step, add 5.5 parts of tetraethoxysilane, 9.5 parts of water, and 5 parts of acidic catalyst sulfuric acid into the reaction vessel described in the first step, heat in a water bath, and react for 6 hours under stirring. The reaction temperature is 45 ° C, and the pH value is 4. Obtain the aluminum powder pigment initially coated with organosiloxane;

[0035] In the third step, the temperature of the reaction system described in the second step is raised to 92.5°C, 5 parts of styrene, 6.5 parts of divinylbenzene, and 4.005 parts of initiator potassium persulfate are added, and the reaction is carried out under stirring for 6 hours to obtain organosiloxane and Polymer-coated aluminum powder pigments;

[0036]The fourth step is to cool the aluminum powder pigment suspension obta...

Embodiment 3

[0038] The first step, in parts by mass, adds 10 parts of aluminum powder pigments and 90 parts of solvent propanol in the reaction vessel, stirs at room temperature for 2 hours;

[0039] In the second step, add 6 parts of epoxytrimethoxysilane, 10 parts of water, and 8 parts of acidic catalyst hydrofluoric acid into the reaction vessel described in the first step, heat in a water bath, and react for 10 hours under stirring, and the reaction temperature is 60°C , the pH value is 6, and the aluminum powder pigment initially coated with organosiloxane is obtained;

[0040] In the third step, the temperature of the reaction system described in the second step is raised to 120° C., 5 parts of methyl methacrylate, 5 parts of butyl methacrylate and 10 parts of methyl acrylate, and 8 parts of initiator ammonium persulfate are added, and stirred After reacting for 10 hours, the aluminum powder pigment coated with organosiloxane and polymer was obtained;

[0041] The fourth step is to...

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Abstract

The invention discloses a coated aluminum powder pigment and a preparation method thereof. The preparation method comprises the following steps: mixing the aluminum powder pigment with solvent alcohol; then adding organosiloxane, water and an acidic catalyst, carrying out heating in a water bath and carrying out a reaction so as to obtain aluminum powder pigment preliminarily coated by organosiloxane; then heating a reaction system to 65 to 120 DEG C, adding an initiator and one or a plurality of monomers containing polymerizable groups and carrying out a reaction to obtain the aluminum powder pigment coated by organosiloxane and polymer; and finally, carrying out cooling, filtering, washing and drying so as to obtain the coated aluminum powder pigment. According to the invention, organosiloxane forms a first coating layer on the surface of the aluminum powder pigment at first and then the polymer forms a second coating layer on the surface of the aluminum powder pigment, so the coated aluminum powder pigment has good acid and alkali resistance on the basis of maintenance of good metal luster and is applicable to a waterborne paint; and the method overcomes the problem of gas generation in the process of usage and storage of traditional aluminum powder pigments and lays a foundation for safe use of the aluminum powder pigment.

Description

technical field [0001] The invention relates to the technical field of surface treatment of metal pigments, in particular to a method for preparing coated aluminum powder pigments. Background technique [0002] Aluminum powder pigment is one of the important metal pigments, and its main application areas are industrial coatings, automotive coatings, printing inks and plastic processing industries. The reason why aluminum powder pigments have many application fields is that they have characteristics different from other pigments: (1) "angle-dependent" effect or "two-color" effect. That is, when the coating containing aluminum powder is observed from different angles, the color of the coating will change with the angle. The coating is very bright in color when viewed from the front; it darkens when viewed from the side. Aluminum powder pigments are widely used in decorative paints because of this effect. (2) Aluminum powder pigments have good ability to reflect light and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/64C09C3/12C09C3/10C09C3/08
Inventor 刘从荡
Owner 刘从荡
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