Frequent environmental protection traps in the hot

Environmental protection "traps" frequently appear in the home industry

environmental protection "traps" frequently appear in the home industry

December 15, 2014

[China paint information]

there are many environmental protection problems in the floor

at present, consumers also pay more and more attention to floor safety. In recent years, some flooring businesses have also created many environmental protection concept products for the psychology of consumers, but to the disappointment of many consumers, they only stay at the concept level after all

after buying new floors, many consumers will smell a strong irritant gas and always feel hot eyes, tears, chest tightness, etc. the main reason is free formaldehyde. Zhang Jie, a professor at East China University of science and technology, told the Beijing Morning Post that there are mainly two aspects that affect the environmental protection of composite flooring, glue and surface coating. Trialdehyde glue (i.e. urea formaldehyde glue, phenolic glue and melamine formaldehyde glue) is its main bonding raw material. Due to its high viscosity and low price, trialdehyde glue is widely used in wood products, but it produces formaldehyde after hydrolysis. "The volatilization of formaldehyde can not be released in a few months, and sometimes it can last for many years." Professor Zhang said that if environmental friendly adhesives, such as polyurethane adhesives, are used, there will be no environmental protection problems. However, compared with general harmful adhesives, polyurethane adhesives are expensive and costly. Generally, manufacturers that cannot reach the scale will not use environmental friendly adhesives in order to reduce costs

jiangzhiguo, an associate professor at Beijing University of chemical technology, told the Beijing Morning Post that in fact, in addition to formaldehyde, which is well known to consumers, some small organic molecules in flooring materials are also the culprits of environmental protection problems. "People will notice the harm of formaldehyde when they smell the pungent smell, but tasteless organic small molecules such as trace benzene, toluene and xylene are more likely to endanger people's health because they are not detected."

with regard to the "zero formaldehyde" propaganda banner issued by many businesses, Professor Jiang said that if it is a high-quality solid wood floor, the wood quality is high, in a sense, it can achieve "zero formaldehyde", that is, the formaldehyde content of the product is extremely low. However, some businesses use inferior materials, or use fast-growing trees, such as poplar and willow, to process them into "technological wood" to make floors. On the surface, they are solid wood, but in fact, the middle is filled with chemical glue. "This technique used to be used by many businesses in imitation of mahogany furniture (mahogany furniture decoration effect picture) (mahogany furniture decoration effect picture), but now it has slowly entered the flooring industry, and the formaldehyde content must be seriously exceeded."

as for the key to the purchase of flooring, the two professors said that in addition to looking at the level of boards, the other is to admit that one price is one goods, because the market is fair. "It's not that the most expensive is the best, but the price too cheap will definitely not be high-quality." Professor Zhang also reminded consumers that when shopping, they must smell the smell. No pungent smell can basically ensure safety. "Some businesses will also use the smell of camphor trees to cover up the pungent chemical taste, and consumers should pay particular attention."

paint solvents are also learned

nowadays, paint with the words "environmental protection" and "zero VOC" can be found everywhere in various building materials markets. More and more enterprises are playing the "environmental protection card". In addition to the floor industry, in the coating industry, "environmental protection" has gradually become an abusive term in enterprise publicity. But are these "environmentally friendly paints" really environmentally friendly

in terms of the current coating industry, many enterprises boast their own safety and environmental protection, but the environmental protection standards of many paints cannot withstand scrutiny. Jiangzhiguo, associate professor of Beijing University of chemical technology, said that coatings can be divided into two parts, solvents and film-forming substances, of which solvents account for about 50%. At present, the solvent part of the common paint on the market is organic solvent. The implication is that as long as it is oily paint, it cannot be free of harmful substances. "These substances usually take five to ten years to evaporate."

so, is there really environmentally friendly paint? Professor Zhang Jie of East China University of science and technology said that at present, environmental protection coatings basically develop in two ways: water-based paint and UV curing paint. Water based paint, as the name suggests, is to use water as solvent, so the existence of harmful substances can be greatly reduced in the process of use. UV curable coating is to use the energy of ultraviolet light to initiate the polymerization and cross-linking reaction between low molecular prepolymer or oligomer in the coating and monomer molecules as active diluent to obtain a hardened paint film, so as to achieve pollution-free. However, due to the lack of categories and publicity of environmental protection coatings, many consumers do not understand it at all. "At present, environmental friendly coatings cannot be widely spread, and many consumers do not understand their excellence." Professor Zhang said, "not long ago, East China University of technology and Dow Chemical jointly held a children's paint competition, which is intended to promote and introduce environmentally friendly coatings to the people."

if water-based paint is so environmentally friendly, will it have no shortcomings? The answer, of course, is "no". According to Associate Professor Jiang, although water-based paint is environmentally friendly, the coating layer is very thin, only one sixth of that of oil-based paint, and the wear is fast. Therefore, we should dialectically look at the advantages and disadvantages of water-based paint and oil-based paint. He said that when consumers buy paint, whether it is oil-based paint or water-based paint, they should not only look at samples, but also ask businesses to look at real objects, and believe that it will affect the experimental data market, and believe in big brands: "the establishment of a brand must be reasonable. In addition, with the development of technology, some shortcomings of water-based paint will also be solved in the future."

sofa materials and dyes are prone to harm

most consumers or are only used to write papers know that there are harmful substances in floors, coatings, etc., but few consumers pay attention to the environmental protection problems of sofa (sofa decoration effect picture) (sofa decoration effect picture) and fabric home textiles. At present, the fabric sofa and leather sofa on the market are rarely pure cotton, pure wool or pure leather, and their main raw materials are chemical fiber, blending, cotton linen, artificial leather, etc. of light industrial textiles. Tian Jingyan, Deputy Secretary General of the synthetic leather industry association, said in an interview with the Beijing Morning Post that most manufacturers will use PVC material as the back of the sofa and polyurethane material as the front (i.e. human contact surface) when making sofas. If PVC is used as the contact surface of sofa, it will be as large as several 10 tons. For example, the experimental force of the largest electronic universal testing machine in China, such as ordinary steel, is 600kN, and the level 0.5 machine is harmful to human body. In order to make the cloth surface of fabric sofa look more beautiful, some businesses will make the color very gorgeous driven by imported exchange servo motors. At this time, it is necessary to pay attention to whether there is a problem with fabric dyes. "In order to make the color more bright, many businesses will use azo dyes, which can decompose to produce more than 20 kinds of carcinogenic aromatic amines, and cause human body diseases through activation. Azo dyes have been banned internationally from being used in fabric consumer goods that have long been in contact with the skin, but some manufacturers will still use them."

Secretary General Tian reminded consumers that when purchasing sofas, if they are leather sofas, they must ask about their materials. If the contact surface uses polyurethane or microfiber, it will not be harmful to the body. For fabric sofa, try to choose light colored fabrics to avoid too bright colors