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At present, consumers are paying more and more attention to floor safety. In recent years, some flooring companies have also created many environmental protection concept products for consumers, but many consumers are disappointed that they only stay at the conceptual level.
After purchasing a new floor, many consumers will smell a strong irritating gas, always feel hot eyes, tears, chest tightness, etc., mainly due to free formaldehyde. Zhang Jie, an East China University of Science and Technology professor, told the Beijing Morning Post that the main factors affecting the environmental protection of composite flooring are plastic and surface coatings. Triacetal is the main raw material for bonding. Due to its high adhesiveness and low price, triacetal is widely used in wood products, but it produces formaldehyde after hydrolysis. “The volatilization of formaldehyde is not released in a few months. And sometimes it lasts for many years.†Professor Zhang said that if environmental protection adhesives, such as polyurethane adhesives, are used, there will be no environmental problems. However, compared with general harmful adhesives, polyurethane adhesives are expensive and costly and generally do not meet the requirements. In order to reduce costs, manufacturers of scale do not use green plastic.
Jiang Zhiguo, an associate professor at Beijing University of Chemical Technology, told the Beijing Morning Post that in addition to the formaldehyde that consumers know well, some organic small molecules in the floor materials are also the culprits that cause environmental problems. “When people smell a pungent odor, they will notice the harm of formaldehyde, but odorless organic small molecules such as traces of benzene, toluene, and xylene are more likely to endanger people’s health because they are not perceived.â€
For many businesses to play the "zero formaldehyde" propaganda banner, Professor Jiang said that if it is high-quality solid wood flooring, wood quality is high, in a sense, can be achieved "zero formaldehyde", that is, the product formaldehyde content is extremely low. However, some businesses use inferior materials or use fast-growing trees, such as poplars and willows, to produce "technical wood." Floors are made from solid wood. In fact, they are filled with chemical glue. “A lot of these businesses used to use imitation mahogany furniture before, and now slowly into the flooring industry, the formaldehyde content must be seriously exceeded.â€
For the key to the purchase of the floor, the two professors said that in addition to looking at the sheet level, the other is to admit that the price is a point, because the market is fair. "It's not that the most expensive thing is the best, but the price that is too cheap will certainly not be of good quality." Professor Zhang also reminded consumers that when shopping, they must smell the odor, and there is no pungent odor that can basically guarantee safety. “Some merchants also use the smell of eucalyptus to cover up the pungent smell of chemicals, and consumers in particular should pay attention.â€
Coating solvent is also very knowledgeable
Today, in the various building materials markets, paints that read “environmental protection†and “zero VOC†abound. More and more companies are playing "environmental protection cards." In addition to the flooring industry and the paint industry, “environmental protection†has gradually become a corporate vocabulary for abuse. But are these "green paints" really environmentally friendly?
As far as the current coating industry is concerned, many companies have advertised their own safety and environmental protection, but many of the paint's environmental standards cannot withstand scrutiny. According to Jiang Zhiguo, associate professor of Beijing University of Chemical Technology, the coating can be divided into two major parts, solvent and film-forming material, in which the solvent accounts for about 50%. Currently common paint on the market, solvent part is organic solvent. The implication is that if it is an oil paint, it cannot contain harmful substances. "These substances usually take five to ten years to evaporate."
So, in the end there is no real environmental protection coating Professor Zhang Jie East China University of Science and Technology, said that at present the basic development of environmentally friendly coatings to two ways, one is water-based paint, and the other is UV-curable coatings. Water-based paint, as its name suggests, is water used as a solvent, so it can greatly reduce the presence of harmful substances in the process of use. Photocurable coatings use UV energy to initiate the polymerization and cross-linking reaction between low-molecular prepolymers or oligomers in the coating and monomer molecules as reactive diluents to obtain a hardened paint film. No pollution. However, many consumers do not understand environmental protection coatings because they have fewer categories and less publicity. “Currently, environmental protection coatings cannot be widely disseminated, and many consumers still do not understand their excellence.†Zhang said, “Not long ago, East China University of Science and Technology and the Dow Chemical Co., Ltd. jointly organized a children's paint contest. People promote and introduce green paint."
Water-based paint is so environmentally friendly. Is there any disadvantage? The answer is of course “Noâ€. Associate Professor Jiang introduced that although the water-based paint is environmentally friendly, the smear layer is very thin, only one-sixth of the oil paint, and the wear is rapid. Therefore, we must dialectically look at the advantages and disadvantages of water paints and oil paints. He said that when consumers buy paint, whether it is oil paint or water paint, do not just look at the sample, we must ask businesses to see the real thing, and to believe in the market, I believe the big brand: "A brand's establishment, it certainly makes sense In addition, with the development of technology, some disadvantages of future water-based paints will also be solved."
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