Super-weather-resistant low-VOC bus paint and preparation method thereof

Abstract

The invention discloses super-weather-resistant low-VOC bus paint and a preparation method thereof. The super-weather-resistant low-VOC bus paint is obtained by mixing a component A and a component Baccording to the mass ratio being (1.5-2.5):1, wherein the component A comprises, by weight, 50-70 parts of hydroxylated acrylic resin, 5-10 parts of diluent, 1-5 parts of solvent, 0.1-0.6 part of a flatting agent, 0.5-1 part of ultraviolet light absorber and 15-25 parts of a colorant, and the component B comprises, by weight, 50-65 parts of a curing agent, 15-30 parts of diluent and 10-30 parts of solvent. The VOC value of the super-weather-resistant low-VOC bus paint is lower than 415 g / L, water resistance is kept for 25 days or above, and good weather resistance is achieved.

Description

technical field [0001] The invention belongs to the field of paint preparation, in particular to a weather-resistant low-VOC bus color paint. Background technique [0002] At present, the domestic and foreign automobile body painting is mainly a three-coat system, that is, the cathodic electrophoretic paint layer, the intermediate paint layer and the top coat layer are applied sequentially on the car body material, and the top coat layer is usually divided into base colors from the inside to the outside. Paint layer (also known as base paint layer) and finish paint layer (also known as finish varnish layer or varnish layer). With the gradual improvement of people's awareness of environmental protection, the laws and regulations limiting the emission of volatile organic compounds (VOC) in coatings are becoming more and more perfect and strict. Countries such as Europe and the United States have used water-based coatings to meet the requirements of VOC emissions, but because ...

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Problems solved by technology

Countries such as Europe and the United States have used water-based coatings to meet the requirements of VOC emissions, but because water-based coatings have different construction process requirements than traditional solvent-based coatings, not only the cost of materials is high, but equipment investment and energy consumption have also increased significantly. The automobile coating line still adopts the traditional solvent-based coating line, and the traditional solvent-based paint coating has a VOC of more than 420g / L, and its water resistance can only reach 10 days.

However, the existing published literature, such as the patent CN105238169A "High weather resistance and low VOC water-based fluorocarbon metal paint and its preparation method" discloses a water-based coating with up to 15 formulations. Although the VOC value is less than 50g / L, but Its water resistance is only less than 170h; patent CN102010648A "A primer-free flashing primer for metal parts and its preparation method" discloses 14 kinds of formulas, and the preparation process is cumbersome; patent CN107163812A "A low-VOC Super weather-resistant and corrosion-resistant engineering machinery topcoat and its preparation method", the method reduces VOC by reducing the amount of resin and diluent, increasing the amount of other components, and adding modified boron nitride, modified aluminum borate crystal beard, titanium dioxide, molybdenum disulfide and other precious metal compounds, so its cost is greatly increased

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