Application of iron pigments in environmentally friendly floor coatings (2)

3 The performance evaluation of iron pigments in floor coatings
3.1 dispersion
pigment dispersion is an important index used in flooring coatings, pigment dispersion not only affects its colorability and phase of the product, but also may have some impact on the optical properties of prepared flooring coatings. The dispersion of pigment is related to its surface properties, particle size, particle size distribution and other factors. If the pigment surface is non-polar, then the application of non-polar system is very easy to disperse, and if the pigment surface is polar, then the application in water-based floor coatings and other fields is very easy to disperse. In addition, pigment dispersion is related to the particle size distribution of pigments, which is relatively easy to disperse in applications when the pigment particle size is evenly distributed and narrow. Therefore, Huayuan Pigment Co., Ltd. through ultra-fine means to control the particle size distribution of iron oxide red to improve its dispersion, so as to meet the needs of the floor coatings and other industries.
3.2 heat resistance
floor coating in the use of the process of temperature resistance requirements are relatively low, but some coatings are prepared at 80 to 100 degrees C or even 120 to 130 degrees C drying, so the preparation of paint pigments to at least 150 degrees C to ensure that after drying unchanged color. Therefore, the heat resistance of pigments directly affects the preparation process of paint. At present, the thermal weight analysis (TG) can be used to determine the heat resistance of pigments, Figure 1 is Huayuan Pigment Co., Ltd. ordinary iron oxide yellow pigment thermal weight analysis curve, from which it is easy to observe the temperature resistance of ordinary iron oxide yellow. The temperature resistance of iron pigments can basically meet the requirements of most floor coatings.3.3 weather resistance
the floor coating on the weather resistance requirements are relatively high, so the pigment weather resistance requirements are also relatively high. Iron pigments are traditional inorgilated pigments with excellent weather resistance. The use of iron pigments in floor coatings can effectively solve the weather resistance problem of floor coatings.
3.4 Color performance
color performance of pigments is one of the important indicators to measure their quality. Three elements of color: phase, clarity, purity. Hue is also called color difference, refers to the color of specific color appearance, such as lemon yellow, emerald green, lake blue, etc., hue is the most obvious characteristic of color; The International Lighting Commission (CIE) has established a set of criteria for defining and testing pigments to ensure that the colors observed by the human eye are consistent with the measurements of sample colors. For brightness or brightness weights (L), a and b are two color channels, a including colors from dark green (low brightness value) to gray (medium brightness value) to bright pink (high brightness value); Pigment in the floor paint color judgment, first it is prepared into a color slurry, and then the chroma meter is used to measure the chroma, according to the Hunter formula to calculate the chroma difference value: -type, L-L'-L; L and L'represent the brightness values before and after, a and a' represent the red (green) values of the front and rear pigments, and b' represent the yellow (blue) values of the front and rear pigments, respectively.
3.5 Other properties
In addition to the performance described above, pigments in the floor coating also have other properties to pay attention to, such as solvent resistance, water resistance, acidity and alkalinity, pigment mixing and toxicity. Feng Arong and others carried out a liquid phase low-heavy metal iron oxide brown preparation work, successfully prepared excellent performance and more environmentally friendly iron brown pigment powder.4 Conclusion: With
development of the construction industry, the requirements for floor coatings are getting higher and higher. In the face of the popular concept of environmental protection, environmentally friendly flooring coatings are the main direction of future development. Iron pigments as a traditional inorderable pigment, and belong to the environmental protection pigments, for the high-end development of floor coatings, is also seeking new breakthroughs.
(1) launched ultra-fine series, temperature-resistant series and special series to meet market demand and expand the field of application of iron pigments.
(2) Iron pigments have good temperature resistance, weather resistance, and more types of color, can be better adapted to the development of floor coatings, the development of environmentally friendly floor coatings will have important significance..