Formula elements that affect the construction area of latex paint

Latex paint is currently a large amount of paint on the market a category, especially interior wall decoration, in doing interior wall product research and development, often hear a complaint is not enough brush area, not like a certain brand grade.about whether latex paint needs to be thinned, as early as ten years ago, a company's senior management on the boom, latex paint does not need to open thin, performance is best, thinning will affect the performance of all aspects of latex paint. Theoretically, if latex paint is suitable for construction viscosity, not open thin, the performance will indeed be better than open thin
China
. However, doing so will lead to higher costs, in the current market competition, construction workers are mostly thin products.Chinese has always been pragmatic, and then manufacturers began to spell out the proportion of water. Sales people often feedback that a product is not sticky enough, too thin, or another way of saying that the painting area is not large enough to compete.
we first theoretically, a product, when the formula is determined, its volume is fixed. When we write the instruction manual, there is a hypothetical condition, the thickness of the dry film is fixed, through the volume of solid content and dry film thickness to calculate the theoretical construction brush area.
But the actual situation and theoretical values will have a certain deviation, such as the roughness of the substrate, the ratio of thinning, the use of construction tools, construction personnel habits, etc. will lead to inconsistent dry film thickness and cause differences in construction area.now, let's put aside the differences in construction area caused by external factors, only from the formula structure, composition, indicators to analyze, construction brush area by which factors are more affected?the same thickness as the dry film, the larger the volume content, the larger the construction brush area. For example, the volume of high-grade latex paint is much larger than low-grade latex paint, so high-grade latex paint construction area is larger.the proportion of the impact: We assume that in the case of external factors are consistent (e.g. substrates, tools, construction personnel, thinning ratio, product grade), in the case of construction tools with the same volume of paint, that is, take the same volume of paint, the weight of the high proportion is greater, the consumption of paint is relatively more than the low proportion, in terms of weight, low proportion of products than the high proportion of the product construction area is larger.From the composition of the composition of the formula to see: water thickening better thickeners, such as cellulose, in the same formulation system, in the case of the same viscosity, than alkali swelling, polyurethane thickener boiling water ratio is larger, construction area is also larger.careful comparison, high molecular weight cellulose than low molecular weight cellulose used in the same formulation system, thin to the same construction viscosity, construction area is larger.The impact of these construction areas due to thickening system, the principle is:
high molecular weight of cellulose is generally hydro-hydrogenic, and emulsion cross-linking almost no, only thickening of water, the formation of the paint liquid state is not equal. It is shown as a level difference, and the stir flow is not a flow pattern.
But low molecular weight cellulose, alkali-soluble type, polyurethane-type thickener is generally cross-linked with emulsion, hydrophase is more
suitable, the formation of the lacquer state is ermophic, the performance of good flow leveling, provoking flow line type, with a better flow state; ICI
high viscosity, from the construction effect, the performance of the construction area is small, paint film plumpness is high.
, to improve the construction area, the preferred high-grade paint. If you want to improve the construction paint area on the same economy paint, formula design requirements: first, low proportion, second, multi-use high molecular weight cellulose, try not to use or use less other types of thickeners, third, appropriate increase in initial viscosity.No matter how, the same grade of latex paint, if the paint area is large, then the thickness of the paint film on the unit area will become smaller, the performance of the paint film plumpness is not enough, the paint film feel is poor.