What are water-based paint and coating formulation

All water as solvent or paint as dispersion medium, can be called a water-based coating. Water-based coatings including water-soluble coating, water dilute coatings, water dispersion paint, latex paint 3 kinds. Water soluble coatings based on water soluble resin as film forming matter, represented by polyvinyl alcohol and its various modification, there are water soluble alkyd resin, water soluble epoxy resin and inorganic polymer water-based resin, etc.

Water-based paint is a medium of coating in warter. As we all exterior paint, metallic paint, automobile paint, etc have corresponding water-based coating product.

Water-based coating belongs to multiphase dispersed system, the water as the continuous phase, polymer fillers as dispersed phase. Due to the structure of the polymer, the types of additives and different method of dispersion, the global paint net polymer and fillers in dispersion in water-based coatings are different, and their stability is also different. For any one to reach the stable state of system, the system tends to reduce the surface free energy, the delta G 〈 0.

Water-based coating is widely used in modern construction industry of building materials product, its construction is simple, and curing is faster, paint film is colour and lustre is bright, so people's favorite.

Coating process:

Coating process is to the order of the various components of the coating raw materials in a certain input, process of dispersed evenly, normally emulsioni paint production process consists of three parts:

Slurry preparation: first of all, the water, dispersing agent, defoaming agent, preservative liquid materials such as scattered into the jar, stir well, in the condition of stirring the coloring pigment and extender pigment in turn into, and accelerate the dispersion 20 ~ 40 minutes;

Water-based coating ingredient: in paint cans into emulsion, add the thickening agent, PH regulator, antifreeze, film-forming agent, defoaming agent, such as fertilizer, stirring for about 15 minutes, until completely homogeneous, after detected;

Coating filtering and product packing: in the production process of emulsioni paint, due to the small yan (filling) material has not yet been dispersed, or because of break emulsion particle, or the presence of impurities in the paint, so the coating should be filtered to remove coarse particle and impurity to obtain good quality products, can according to the requirement of the product is different, choose different specifications of the mesh screen and container packaging, and completes the measurement, so as to obtain the final product.

The key points of coating preparation:

Water-based coating formula materials should choose good dispersion pigments and superfine fillings as far as possible, increasing product quality under the premise of stable cancel grinding operation, simplify the production technology, improve production efficiency;

In the early stage of the dispersed phase, can be in advance into a suitable amount of HEC, will not only help spread out, prevent or reduce with slurry wall at the same time, improve the dispersion effect;

Before liquid thickener to join, should try to use 3 ~ 5 times after the water dilute, in full, mix slowly from the local high concentration thickener emulsion cluster or form micelle, thickening agents can be put in full mixing slurry dispersed into the pulp so as not to appear afore-mentioned problems; (4) the defoaming agent take part in the half way to the pulp, the other half to match paint process, this can make the defoaming effect is better; Paint mixing process, the stirring speed should be controlled in 200 ~ 400 r/min introduced a large number of bubbles in the process of production, in case influence the coating quality.