The large core board, also known as the blockboard, is a kind of plywood with a solid wood core. The formaldehyde in the large core board is mainly derived from the urea-formaldehyde resin glue used in the manufacture of the large core board. This adhesive has high bonding strength and is currently commonly used in the production of various large core sheets, but the urea-formaldehyde resin contains certain Formaldehyde, which forms free formaldehyde and is released into the air, poses a serious threat to human health.
The large core board is an indispensable material for interior decoration. However, the test and comparison results of the 33 brands of large core boards sold in the Beijing market announced by the China Consumers Association this year show that only one of the 33 products meets the requirements of the formaldehyde emission limit of the wood-based panels implemented by the country this year. Used directly indoors. Among these brands, the sample with the highest formaldehyde emission exceeded the national standard by 26 times.
First, relevant experts said that consumers should pay attention to the following points when purchasing large core boards:
1. Is it a product of a regular manufacturer? To check the trademark, production address, anti-counterfeiting mark, etc. of the manufacturer;
2. The amount of formaldehyde released in the product test report. Generally, the products produced by regular manufacturers have test reports, and the detection value of formaldehyde should be as low as possible;
3. The appearance quality of the large core board. Look at whether the surface of the large core board is flat, whether it is warped or deformed, whether there is blistering or dent; whether the arrangement of the core strips is even and tidy, the smaller the gap, the better, whether the core strip has decay, breakage, wormhole, thrift and so on.
4. Is there any smell? If the large core board emits a scent of wood, it means that the formaldehyde is released less; if the smell is pungent, it means that the amount of formaldehyde is released, it is best not to buy.
Second, when using large core boards, the following aspects should be noted to minimize the release of formaldehyde:
1. Reasonably determine the amount of use. Generally, the area of ​​the living room of about 100 square meters should not exceed 30 sheets, and other items, such as furniture and wooden floors, should be considered. If too much, the formaldehyde will exceed the standard.
2. Do a good job of finishing the large core board. According to the national "Restriction of Hazardous Substances in Wood-based Panels and Their Products for Interior Decoration Materials", large core plates with a formaldehyde emission of not more than 5 mg per liter must be finished after being treated for indoor use.
3. Purification and sealing treatment of large core plates that cannot be finished, especially in the back panel of decoration projects, various cabinet inner panels and heating hoods. You can consider purchasing some aerosols that eliminate and block formaldehyde on the market, and use them best at the same time.
4. Detection and purification of formaldehyde in indoor air after decoration. Do not rush to check in after the renovation of the room, it is best to find the relevant departments to test, listen to the opinions of experts, choose the appropriate check-in time.
Third, formaldehyde
Formaldehyde is a kind of chemical gas. When the content in the air reaches a certain concentration, it will cause harm to the human body. Long-term living in an environment where the concentration of formaldehyde exceeds the standard, the human eye, nose, and respiratory system may suffer obvious damage or skin disease. Animal experiments have shown that excessive formaldehyde release can also cause cancer of the nose and respiratory system.
Formaldehyde in laminate flooring is mainly produced by a formaldehyde-based resin that acts as a binder during the manufacturing process. The resin has strong adhesiveness, has the function of strengthening the hardness, anti-insect and anti-corrosion of the board, and is cheap, and is the preferred glue material for the artificial board.
Since the formaldehyde contained in the floor does not evaporate immediately, but slowly evaporates due to different temperature and humidity conditions, the volatilization time is more than ten years. Therefore, countries have strict standards for the amount of formaldehyde released from plywood products. For example, Japan and the European Union stipulate that the formaldehyde emission per 100 grams of plywood must be less than or equal to 10 milligrams, otherwise it is not allowed to go on sale; China's relevant formaldehyde emission limit standard (GB 18580-2001) stipulates: the formaldehyde emission of laminate flooring must be Less than or equal to 1.5 mg / liter, can be used directly indoors.
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