The relationship between the performance of titanium dioxide pigment and the application performance in water-based coatings.
Release time:
2020-10-28
First, the formulation of water-based coatings and the concentration of pigment systems for scientifically characterizing the application performance of titanium dioxide were determined. Based on this, a systematic analysis was conducted on the effects of the hiding power, brightness, and dispersibility of titanium dioxide on its application performance, including opacity, gloss, and weather resistance. The results indicate that the higher the hiding power, brightness, and dispersibility of titanium dioxide, the better the gloss and hiding power of the corresponding water-based paint film, while the impact on weather resistance is minimal.
Keywords: Titanium dioxide; Hiding power; Hiding strength; Dispersibility
Titanium dioxide (TiO2) is one of the most important white pigments, widely used in coatings, plastics, papermaking, inks, and synthetic fibers, with the largest usage in coatings, accounting for about 60% of the total production of titanium dioxide. Due to the late development of the titanium dioxide industry in China, the variety of products is limited, with most being general-purpose products. The testing standards generally adopt the national standard GB/T1706-2005, focusing mainly on physicochemical indicators and pigment performance indicators, while downstream application manufacturers pay more attention to application indicators. In the general-purpose field, pigment performance can partially characterize product application conditions, but in specialized or high-end fields, the existing factory testing system for titanium dioxide cannot fully meet the requirements of downstream users. Understanding the relationship between titanium dioxide pigment performance indicators and application performance can help in technical marketing and facilitate quality improvement and other technical work based on feedback from product applications.
In this study, first, by improving the existing water-based coating formulation, the influence of other pigment fillers such as barium sulfate and heavy calcium was removed, allowing the formulation to truly and objectively reflect the impact of titanium dioxide on coating performance. Additionally, by analyzing the application performance of titanium dioxide with different pigment performance in water-based coatings, the corresponding relationship between titanium dioxide pigment performance indicators and application performance was identified.
1 Experimental Section
1.1 Main Raw Materials and Equipment
Rutile titanium dioxide: industrial grade, Pangang Group Titanium Industry Co., Ltd.; SD-800 modified styrene-acrylic emulsion: Nantong Shengda Chemical Co., Ltd.; wetting dispersants, substrate wetting agents, leveling agents, thickeners, and other additives: Shunde Sansheng Trading Company.
QPM-5 grinding instrument: Guangxi Wuzhou Runxun Gem Machinery Factory; QXD scraper fineness gauge: Shanghai Modern Environmental Engineering Technology Co., Ltd.; SP60 series integrating sphere spectrophotometer: X-Rite, Inc.; BYK-Gardener 60° gloss meter; Germany; SDF04 high-speed disperser: Shanghai Weida Industrial Co., Ltd.; wet film applicator: Shanghai Modern Environmental Engineering Technology Co., Ltd.; Ci3000+ xenon lamp aging test chamber: American Atlas.
1.2 Experimental Methods
(1) Whiteness Test
According to the GB/T6749-1997 standard "Method for Representing the Color of Paint Films", the color of the paint film is represented using the L*, a*, b* coordinate system, where L* represents lightness, a* represents the transition from red to green, and b* represents the transition from yellow to blue.
(2) Fineness
According to the GB/T6753.1-2007 standard "Determination of the Fineness of Pigmented Paints, Varnishes, and Printing Inks", a scraper fineness gauge is used for detection.
(3) Hiding Power
A small amount of paint is placed on a smooth, clean polyester film, and a 100 μm thick wet film applicator is used to quickly spread it, allowing it to dry naturally.
After 48 hours, a color difference meter is used to read the color values of the polyester film on black and white boards, obtaining the hiding power value. The higher the hiding power value, the better the hiding power.
(4) Weather Resistance
Aging is conducted according to the national standard GB/T1865-2009 "Artificial Climate Aging and Artificial Radiation Exposure of Color Paints and Varnishes Filtered Xenon Arc Radiation", and the gloss before and after aging is measured.
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Key words: tengxian titanium dioxide, titanium dioxide, rutile, titanium dioxide manufacturers, anatase titanium dioxide, titanium dioxide manufacturers, anatase titanium dioxide, rutile titanium white
Contact Information
Address: Teng County, Guangxi Chemical Industry Zone