Water-based paint spray characteristics and requirements

With increasingly stringent environmental standards of performance, environmentally friendly water-based paint as paint has been widely applied and development. As we all interior and exterior paint, metallic paint, car paint, etc. have a corresponding water-based paint products. Currently on the market as a relatively new paint coating, a lot of people for which no proper understanding, we should know more about the characteristics of water-based paint and spray application requirements in order to better use in daily life. stone coated metal roofing tile
1 Introduction waterborne coatings
Any water as a solvent or dispersion medium of paint to do, can be called water-based paint. Water-based coatings include water-soluble paint, water-reducible coating, water-dispersible coating (latex paint) three kinds. Coating is a water-soluble resin is water-soluble film-forming material, polyvinyl alcohol and its various modifications thereof as the representative, in addition to water-soluble alkyd resins, epoxy resins, and inorganic polymer water-soluble resin.
(2) the characteristics of water-based paint
Water-based paint in the manufacturing and construction applications with water as a solvent, the equipment can be cleaned with water; increased solids content, the lower prices; waterborne coatings than solvent-based pigment dispersion is poor, can affect weatherability; surface tension than solvent-based high wettability of the surface of the workpiece, poor distribution, film easy to produce pinholes, craters, bubbles and sagging ills; waterborne coatings water evaporates more slowly than solvent-based coatings, flashing for a long time or need low-temperature baking. The higher the water content of the aqueous coating to be dry and at a temperature below 100 ℃ heat insulation segment, can be baked to substantially removing water; shear forces affect the stability of the water-based paint, in the circulatory system with shear forces in different and there are different viscosity and flow rate.
Water-based paint coating is a relatively new on the market paint, solvent paint respect, as follows:
2.1 The advantage of water-based paint
(1) water-based paint with water as solvent, saving a lot of resources; aqueous coating eliminates the risk of fire during the construction; reduces the pollution of the atmosphere; aqueous coating ether using only a small amount of organic solvent such as low toxicity, improve the working environment condition. Water-based paint in general organic solvents (representing paint) in 10% to 15%, and now has dropped to cathodic electrophoretic coating of 1.2% or less, reduce pollution and save resources for a significant effect.
(2) water-based paint on wet surfaces and wet conditions can be directly coated construction; waterborne coatings on the surface of the material adaptability, coating adhesion.
(3) water-based paint painting tools can be cleaned with water, greatly reducing the consumption of cleaning solvent.
(4) water-based paint electrophoretic coating uniformity and smooth. Flattening good; cavity, welds, edges, edge parts can be coated with a coating film thickness, a good protective; electrophoretic coating has the best corrosion resistance, cathodic electrodeposition coating thick The salt spray resistance up to 1200h.
2.2 Problems aqueous coating
(A) water-based paint on the construction process and material surface cleanliness requirements, because the surface tension of water, dirt, easy to make the film to produce shrinkage.
(2) water-based paint strong mechanical force against the poor dispersion stability, the flow rate through the conduit changes, the dispersion particles are compressed into a solid particle, the coating produced pitting. Requirements pipeline in good shape, the wall defect. stone coated metal roofing tile
(3) water-based paint on a large painting equipment corrosion requires the use of anti-corrosion lining or stainless steel materials, equipment, and high cost. Water pipeline corrosion coatings, metal dissolution, precipitation of the dispersion particles, the coating produces pitting, but also requires the use of stainless steel tube.