1 floating layer problem of colorful paint
It should be controlled according to the specific gravity of the enamel (dispersed phase) and the protective glue aqueous solution (dispersion medium) and the difference between them. This specific gravity difference has a suitable range, too large or too small will affect the stability of the coating. According to experience, the specific gravity of the enamel is generally controlled between d=1.010---1.020, and the specific gravity of the protective glue is controlled between d=1.003----1.006.
2 The problem of bleed and disperse media turbidity in colorful paints
It is generally controlled by changing the concentration of non-solvent. The concentration of the non-solvent is low, the color particles are fine, the coating film is soft, and the storage stability is poor. At this time, the bleed of the coating and the turbidity of the dispersion medium will occur; however, the concentration of the non-solvent cannot be too high, and the colored droplets will be generated. The skin is sprayed into a film with uneven unevenness and rough hand feeling, so the solvent should be adjusted to a suitable concentration to improve the good condition of the color film and overcome the bleeding and turbidity.
3 Dispersing medium flocculation into agglomerated problem
It is mainly to control the acid value of the coating. For the coating using active pigment in the ratio, it is generally controlled at 6-12 KOH/G, and other acids should be strictly controlled according to the standard.
4 color grain dim light problem
Should start from the following aspects to adjust: 1. Change the cellulose thickener; 2. Reduce the amount of defoamer or change the type of defoamer; 3. Change the pigment variety, pay attention to the adjustment of pH.
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