Coating knowledge: natural mineral coating should be considered to avoid home decoration pollution

Core tip: any kind of modern home building materials has its development history, so does the coating All kinds of common coatings are usually composed of dozens or even hundreds of chemical components Before World War II, most of the coatings used in European and American construction industry were obtained by burning natural stones This traditional production method can even be traced back to the ancient Roman era For example, many churches, palaces and so on left over to the present are basically painted with this kind of coating Chemical coatings emerged after World War II Because a large number of buildings were damaged during World War II, the mineral coatings processed from natural stone materials could not meet the huge demand of post-war reconstruction in Europe, so the chemical synthetic coating Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: any kind of modern home building materials has its development history, so does the paint All kinds of common coatings are usually composed of dozens or even hundreds of chemical components Before World War II, most of the coatings used in European and American construction industry were obtained by burning natural stones This traditional production method can even be traced back to the ancient Roman era For example, many churches, palaces and so on left over to the present are basically painted with this kind of coating Chemical coatings rose after World War II, because a large number of buildings were damaged during World War II, natural stone The processed mineral coatings have been unable to meet the huge demand of post-war reconstruction in Europe, so the chemical synthetic coatings should be shipped out, and with the advantage of quantity suitable for industrial mass production, they have been widely used up to now, while the mineral coatings, in addition to being used in the restoration of historic sites, royal palace maintenance and other work, have gradually withdrawn from the stage of history, and the production process is even close to being lost However, in recent years, with the rise of environmentalism and naturalism, mineral coatings began to revive in European and American countries, many families began to give up chemical coatings and choose natural mineral coatings again; many commercial, government and art institutions began to use mineral coatings in order to highlight their "environmental protection and green" corporate culture In 2011, UNESCO even listed the traditional mineral coating manufacturing process in moron region of Spain as the best practice list of the world intangible cultural heritage, which was used to commend the Spanish government for its outstanding work in the protection, restoration and development of the traditional hand-made coating in the region Moron lime It has also become the only building material listed in the UN World Intangible Cultural Heritage Mineral coating mineral coating is mainly obtained by calcining natural high-purity limestone, so its "gene" has the characteristics of natural and non-toxic The main component of the finished mineral coating is alkali metal silicate, which can react with carbon dioxide in the air to form silica sol after being painted on the wall, and automatically penetrate into the wall and other substrate surfaces, so as to make the pigment , the filler and the substrate undergo silicification under the action of curing agent, which is firmly combined into a whole Similarly, a continuous and complete "stone" coat is put on the wall, which can last for more than 15 years From the engineering examples in Europe, it even has more than 20 years of use experience At the same time, as the human skin, the coating film of mineral coating will not seep water and can also "perspire" In the process of its solidification chemical reaction, it will naturally absorb the water of the wall matrix, so that the matrix remains dry Therefore, the stability of mineral coating is stronger than that of common chemical coating, and it is not easy to have problems such as "blistering", "peeling", "cracking", "falling off" and so on However, the disadvantages of mineral coatings are also obvious, among which the main one is the production and price Taking the mineral coatings in Molong area of Spain as an example, the strict production area protection restricts the annual production itself, and the traditional handicraft production leads to its high price At present, there are only a few domestic companies acting for the mineral coatings in Molong area According to the author's understanding, at present, the paint market is mixed Many products that claim zero formaldehyde or VOC often refuse to provide consumers with authoritative test data Taking VOC as an example, only when the content is less than the detection limit of 2G / L, can we say that the product is not detected by VOC But the market, including many well-known brands, often claims that VOC is not detected when the VOC content is 10-20g / L, or even claims to be a special coating for children's room According to industry experts, for ordinary chemical coatings, to achieve the level of VOC undetected, the raw materials per ton should be nearly 5000 yuan higher, and the production time should be nearly double It is conceivable that businesses claim the profit of zero VOC products with ordinary products In the face of such market chaos, consumers will be attracted if they are not careful Therefore, it is suggested that for home decoration with special environmental protection needs People, such as newlyweds, pregnant or pregnant people, children, the elderly, asthmatics who are sensitive to physical conditions, may wish to consider the use of mineral paint, and when shopping, businesses must provide authoritative test data, do not blindly listen to the advertising of businesses [focus on WeChat official account "paint net"; 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