The the aluminum paste instructions: Zhuang Cailv Silver as a metal pigment allows coatings to produce special effects different from other ordinary pigment, in the course of coating formulations, coating mode of production, construction methods has different from the characteristics of other ordinary pigment. This article to do briefly discusses some tips on Aluminum Silver.

A. Aluminum Silver metallic pigment dispersion

To achieve satisfactory special effects, the metallic pigment must be completely dispersed in the coating system, the coating should be uniform state, fine particles does not occur. Aluminum flake easily bent and broken, in the coating in the production process should After stirring at high speed, or other continuous intense processing, and its geometrical structure can easily be destroyed, resulting in coarse, dark color, reduced covering power, and metal wavering undesirable phenomena. Therefore should not be used means a dispersion of the high shear forces. Recommendations: the use of pre-dispersed; first select a suitable solvent or a mixture of several solvents, the aluminum paste and the ratio of the solvent for the proportion of 1:1 or 1:2, the solvent was added to the aluminum paste, stirring slowly until homogeneous (about 10 ~ 20min). Wetting or dispersing agent is added in the system. The general production of aluminum paste, pre-soaked with solvent a few hours after the line stirring.

II. Aluminum Silver metallic pigment orientation

When the flake pigment coating surface was oriented parallel to achieve the best results. Parallel orientation difference will lead to the phenomenon of "opacity" or diffuse reflection. Flake pigments of orientation with recipe and construction conditions. The shrinkage of the wet coating caused by volatilization of the solvent, the aluminum pigment will eventually be pressed into the horizontal orientation position. Coating the solvent content is higher, the stronger this effect. This explains the phenomenon of the flake pigment orientation. Therefore, the optical properties of the low-solids coatings better than the high-solids coatings.

Volatilization of the solvent will result in a strong vortex within the wet film, but if the solvent evaporation is too slow, it will form a so-called with Na Erde vortex hinder the parallel orientation of the aluminum pigment (produce turbidity phenomenon) can be solvent resin is used to promote rapid evaporation (such as ester Ding cellulose CAB), using additives. They can be fixed flake pigments. Literature reports, the wax dispersions have a "spacer effect", the surface active agent may also have similar functions. But before you use to test its functionality.

III. Resin system

Many common paint binders binders such as oil-based varnish, acrylic esters, alkyd, epoxy, polyurethane and water-based binders can be applied in a non-leafing aluminum paste pigment. Generally speaking, as long as the of any coating base or solvent compatible with the solvent carrier and aluminum paste, aluminum paste and does not cause chemical damage are suitable. Note: aluminum Gender metal and paints the acid value should be controlled below 7.

IV. Aluminum paste solvent selection

Solvent choice is mainly determined by the formulation paints. Zhuang color non-leafing aluminum paste can be widely used both polar and non-polar solvents, such as aliphatic or aromatic hydrocarbons, esters (such as butyl acetate), ketones (such as methyl ethyl ketone, methyl isobutyl ketone), alcohols ( such as ethanol).

The water will react with aluminum to generate hydrogen causing up audible effect, so the moisture in the less than 0.15% of the coating should be strictly controlled. Recommendation: dehydrating agent to remove the paint solvent or diluted compound excessive moisture.

Chlorinated solvents (halogenated hydrocarbons ...) is not suitable for any aluminum paste pigment. Chlorinated solvents will release HCI, with subtle aluminum pigment chemical reaction.
 
V. The proportion of aluminum paste, add

aluminum paste, add a tinted primer ratio of 1% to 4%. |

pure silver primer aluminum paste, add the proportion of 4% -10%.

c, single-layer metallic paint aluminum paste in the ratio of 5% -13%.

d, anti-corrosive paint, canned, and coil coating aluminum paste, add the proportion of 10% -13%. Note: better than the relatively high solids coatings, the optical properties of the coating of relatively low solids within a certain range.
 
Six. Aluminum paste driers selection

When an aluminum-containing silver paste coating systems need to join metal driers, non-leafing aluminum only will not react with the fatty acids on the surface of the aluminum flake driers before use, suggested the use of cobalt , zirconium, manganese driers.

VII. The transport preservation methods of the aluminum paste

Aluminum paste metal pigment due to the metal and chemical properties, should be stored in sealed condition to avoid exposure to sun, rain, ventilation, dry interior space (15 ℃ -40 ℃), as early as possible as soon as possible, and use should be immediately sealed the barrel to prevent the volatilization of solvents and additives. When time is too long, it should detect, prevent hair gray aluminum pigment dries or dispersion weakened.

2 aluminum pigment and water, alkali, acid isolated storage, prevent and above substances contact produce chemical changes. In case of a fire extinguishing, non-water fire extinguishing the required chemical powder fire equipment.

3. The Zhuang Cailv pigment in the storage and transportation process improper operation may lead to the aluminum and the solvent separated from the part of the component and therefore should be sufficiently stirred before use, the separated components were mixed uniformly. Watches under the Dangerous Goods, Aluminum Silver belong to the class of dangerous goods, "containing two flammable solvents, paints, auxiliary materials and coatings" (No. 33646). According to the State Economic and Trade Commission, Shanghai Chemical poison center to detect the flash point determination of the value of the Company's aluminum paste used in high boiling point aromatic solvent (> 61 ° C), the solvent of this product does not belong to two flammable solvent. Accordingly, the State Economic and Trade Commission, Shanghai Chemical poison centers identified the aluminum paste products produced by the Company does not belong to dangerous chemicals.