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粉刷墙壁的涂料分高、中、低三个等级。中、低档涂料乳胶和106粉刷墙壁的费用每平方米分别为1.8元和0.6元,施工单位往往用106涂料冒充乳胶涂料。用中档涂料乳胶粉刷的墙壁可以用水洗而不脱落;而用低档涂料106或107粉刷的墙壁用水洗的时间稍长会脱落。从涂料配方上看:低档涂料的胶料成份为硅酸钠,还加有甲醛(如107),脲素(如801)以及粘稠剂-聚乙烯醇。而中档涂料的胶料成份为聚乙酸乙烯脂。至于粉料一般都是加的碳酸钙。本文用X射线荧光光谱对涂料进行硅元素的鉴定,即可于以判别。二氧化硅的检出限为1%,方法简单可行。一取样方法去净墙上灰尘,在不同地方用刀片刮取表层和中层样品若干个,每个样品重量不能少于2克,于玛瑙钵中磨细到300目,压片备用。
Painted wall paint points high, medium and low levels. Medium and low paint latex and 106 paint the walls of the cost per square meter were 1.8 yuan and 0.6 yuan, the construction unit often used 106 paint pretending to be latex paint. With mid-range paint latex paint walls can be washed without peeling off; and low-grade paint 106 or 107 painted walls with water for a longer time will fall off. From the paint formulations point of view: low-grade paint sizing ingredients are sodium silicate, but also add formaldehyde (such as 107), urea (such as 801) and viscous agent - polyvinyl alcohol. The mid-range paint compound is polyvinyl acetate resin. As for the powder is generally added calcium carbonate. In this paper, X-ray fluorescence spectroscopy for the identification of silicon coating, which can be identified. The detection limit of silica is 1%, the method is simple and feasible. A sampling method to clean the wall of dust, scraping in different parts of the surface and the middle of a number of samples, each sample weight of not less than 2 grams, finely ground in an agate mortar 300 mesh, tabletting spare.