General knowledge of coating: excellent performance of waterborne metallic flash paint

Core tip: as a new technology product to meet people's requirements for the appearance of automobile, the performance of waterborne metallic flash paint is also constantly improving The traditional solvent based metallic flash paint contains more than 70% VOC During the construction process, toxic gases are discharged into the atmosphere, causing serious air pollution For this reason, the waterborne metallic flash paint has obtained the broad development in the automobile manufacture and the repair market In order to make the external light of water-based metallic flash paint show strong flashing effect, the directional deflocculation of metallic flake pigment is very important In order to optimize the orientation of flake metallic pigments in coatings Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings news: as a new technology product to meet people's requirements for automobile appearance, the performance of waterborne metallic flash paint is also constantly improving The traditional solvent based metallic flash paint contains more than 70% VOC During the construction process, toxic gases are discharged into the atmosphere, causing serious air pollution For this reason, the waterborne metallic flash paint has obtained the broad development in the automobile manufacture and the repair market In order to make the external light of water-based metallic flash paint show strong flashing effect, the directional deflocculation of metallic flake pigment is very important In order to optimize the orientation of flake metallic pigments in coatings, the rheology of coatings plays an important role As we all know, the control of rheological behavior of waterborne coatings is much more difficult than solvent based coatings The viscosity of the water-based coating is small enough, and the pseudoplastic rheological behavior can achieve good rheological control, but this is not enough The viscoelasticity of the coating is the decisive factor After spraying, the elastic part must be larger than the adhesive part, so that the metal pigment can be fixed and the ideal effect can be achieved Metallic flash paint can achieve metallic flash effect mainly through flake effect pigment, and there will be specular light reflection on the surface of pigment If you look at the metallic flash paint at different angles, it will produce different light and shade, which is called "jumping" The arrangement state of metallic pigments (mainly aluminum powder) and pearlescent pigments in the coating film has a great influence on the effect of saltation and angular discoloration If the flake aluminum powder or pearlescent pigments are arranged irregularly in the film, the light shining on them will show diffuse reflection; if the arrangement is parallel to the surface or the substrate, the incident light will show directional reflection on its surface, resulting in a large reflected light intensity When viewed from other angles, the light intensity is very weak, resulting in a strong jump effect, that is, under the same incident light angle, with the When people's perspective changes, the brightness of the coating changes strongly The optical effect of waterborne metallic flash paint is related to the effect pigment itself, resin system, solvent, additive, coating production method, spraying conditions and other factors If we want to make every kind of pigment have ideal optical properties, the dispersion of pigment should keep the same, so the dispersion process of waterborne metallic flash paint is very important The best dispersion process is to disperse the metal pigment in the solvent in the proportion of 1:1-2: first, add the metal pigment, add a small amount of solvent and dispersant several times under slow agitation, and stir at a constant speed for about 15 minutes In order to avoid the curl and fracture of the scale pigment in the dispersion process and affect the flash effect, the dispersion equipment used should not use too high shear force If the pigment has organic coloring type, it should be pre ground and dispersed to make pigment paste for standby Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,