Application of new technology in exterior wall decorative coatings

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Excellent weather resistance, stain resistance, extended life, reduced VOC and functional composites will be the future research and development direction of exterior wall decorative coatings. With the improvement of people's awareness of environmental protection and the emphasis on health, the contradiction between architectural coatings and the environment has become increasingly apparent, and its pollution problems have increasingly attracted the attention of the society. Therefore, the development of architectural coatings in the direction of environmental protection and greening is an urgent task. The variety structure of the coating should be toward reducing VOC content and developing towards environmentally friendly products. . In the future, China will also focus on high-performance, high-grade coatings, such as nano-coatings, water-based polyurethane coatings and fluorocarbon resin water-based coatings, to meet and meet the needs of high-end residential and public building exterior wall decoration.

A. Nano-coatings; Nano-Ti02 Since the advent of the 1980s, more and more attention has been paid to the unique photocatalytic performance, UV shielding and flop effect. At present, nano-Ti02 as a new functional material provides good conditions for the development of green coatings; nano-Ti02 modified architectural coatings have high scrub resistance, antibacterial, self-cleaning and aging resistance. The addition of nano-Ti02 to the epoxy resin coating as an ultraviolet absorber prevents the chain of the material from being cracked by the long-term irradiation of ultraviolet light, thereby compensating for the shortcoming of the weather resistance, and can significantly improve the aging resistance.

B. Energy storage luminescent coating; external wall energy storage luminescent coating is a special functional coating, which can display the appearance of the whole building at night, and has a good decorative effect; if the coating can be successfully industrialized and promoted In the commercial districts of the city, the number of floodlights can be greatly reduced while enhancing the urban nightscape decoration, which not only saves the initial investment of the building, but also saves considerable power. The afterglow brightness of the water-based energy storage luminescent coating on the exterior wall of the building increases with the increase of illuminance, and is related to the length of illumination time. It usually takes more than 20 minutes to reach saturation state. When the light is very strong, it will reach saturation within 10 minutes. After dark, its afterglow brightness is higher within 4h, and the effect is obvious. Then it gradually decays with the continuation of time, and the afterglow time of the luminescent paint is verified to be 14 hours. In addition, the coating was subjected to radioactivity inspection and the result was classified as Class A, demonstrating that the luminescent coating can be used in various environments.

C. Powdered architectural coatings; there are many unique technical, economic and environmental advantages in the pulverization of architectural coatings. Especially for synthetic resin emulsion coatings, the proportion of additives in the formulation cost is large. In order to maintain the storage properties of the paint, the use of such additives can be eliminated after pulverization, and considerable packaging costs can be saved. Moreover, since the paint is pulverized, it is convenient to use Portland cement, gypsum and lime which are inexpensive and have many unique performance advantages in its components, and does not require high-temperature baking, thereby making powdery Architectural coatings have good performance - a comprehensive cost advantage and a good development prospect.

D. Elastic exterior paint; the outer wall of the building is mostly leveled with cement mortar before surface coating. Due to the inherent characteristics of cement-based materials, cracks are often generated when subjected to environmental factors such as temperature changes, alternating wet and dry, and freeze-thaw cycles. If the surface is coated with paint, cracking may result. In response to this drawback of the exterior wall of the building, an elastic exterior wall coating has recently been developed. Elastic exterior paint is a functional architectural coating that not only has a good exterior wall decoration effect, but also has a special function of covering the cracks in the base layer.

The polymer particles in the binder used in the elastic exterior wall coating are core-shell structure agglomerates reacted by the bridging technique, in which the main body is a soft monomer and the outer surface is provided with a plurality of hard oligomers. The drying film forming process of the elastic exterior wall paint is basically the same as that of the ordinary latex paint. Both are evaporation of water and deformation of polymer particles, but the principle is different. In ordinary latex paint, only one kind of polymer particles are deformed and agglomerated into a film, and when the outer wall coating is dried, the hard and soft monomers of the polymer particles are closely arranged in the upper and lower directions as the water evaporates. Through the action of ultraviolet light in the sunlight for a period of time, the surface oligomer reacts cross-linking and solidifies to form a very thin and dense hard surface layer, which forms a soft and outer hard core-shell structure.

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