Preparing method of coated aluminium powder pigment
A coating type, aluminum powder technology, applied in the direction of fibrous filler, dyed organosilicon compound treatment, etc., can solve the problems of aluminum powder pigment failure, protective layer falling off, protective effect, etc., to achieve good metallic luster, good resistance The effect of acid-base and water resistance, good compatibility
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Embodiment 1
[0028] In the first step, in parts by mass, 2 parts of aluminum powder pigment and 50 parts of solvent methanol are added to the reaction vessel, and stirred at room temperature for 0.5 hours;
[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 tempera...
Embodiment 2
[0033] In the first step, in parts by mass, 6 parts of aluminum powder pigment and 70 parts of solvent ethanol are added to the reaction vessel, and stirred 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 acid catalyst sulfuric acid into the reaction vessel described in the first step, heat it 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 suspen...
Embodiment 3
[0038] In the first step, in parts by mass, 10 parts of aluminum powder pigment and 90 parts of solvent propanol are added to the reaction vessel, and stirred 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 React for 10 hours to obtain the aluminum powder pigment coated with organosiloxane and polymer;
[0041] The fourth step is to coo...
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