Common knowledge of coatings: sources of indoor harmful factors

Core tip: there are many objects and articles in the room, which contain all kinds of harmful factors Once exposed to the air, they will emit and cause harm It mainly comes from the following aspects: Building materials: some raw materials of cement, brick, lime and other building materials contain radioactive radium When the building is completed, radon (222Rn) and its daughters, the decay substance of radium, will be released into the indoor air and enter the human respiratory tract, which is one of the causes of lung cancer The radon content in the outdoor air is less than 10bq / m3, which can be more than dozens of times when the indoor air is seriously polluted Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Home of paint news: there are many objects and articles in the room, which contain various harmful factors Once exposed to the air, they will emit and cause harm Mainly from the following aspects: building materials: some raw materials of cement, brick, lime and other building materials contain radioactive radium When the building is completed, radon (222Rn) and its daughters, the decay substance of radium, will be released into the indoor air and enter the human respiratory tract, which is one of the causes of lung cancer The radon content in the outdoor air is below 10bq / m3, which can be more than dozens of times when the indoor air is seriously polluted The number of lung cancer deaths caused by radon and its progeny in the United States is 10000-20000 The use of urea formaldehyde foam insulation (UFFI) housing can release a large amount of formaldehyde, sometimes up to 10mg/m3 or more Formaldehyde has an obvious stimulating effect on the eyes, larynx and trachea; it can form allergens in the body, causing bronchial asthma and allergic reactions to the skin; it can damage the liver, especially the people who have a history of hepatitis, after living in the uffi mobile house, it is easy to relapse liver inflammation Long term inhalation of low concentration formaldehyde can cause headache, dizziness, nausea, dyspnea, decreased lung function, neurasthenia and immune function Animal experiments can induce NPC No epidemiological evidence of human carcinogenesis has been found Some building materials contain asbestos, which can disperse asbestos fibers Asbestos can cause lung cancer and mesothelioma of the chest and peritoneum Furniture, ornaments and decorations Commonly used floor leather, floor tiles, chemical fiber carpets, plastic wallpapers, thermal insulation materials, urea formaldehyde resin adhesive and furniture made of fiberboard and plywood made of the adhesive can release a variety of volatile organic compounds, mainly formaldehyde In a newly built high-grade hotel in Shenyang, China, the formaldehyde concentration is up to 1.11mg/m3, and it can reach about 0.17mg/m3 after new decoration in ordinary rooms, which will gradually decrease later In addition, some products can also release benzene, toluene, xylene, CS2, chloroform, trichloroethylene, chlorobenzene and more than 100 kinds of volatile organic compounds Some of them can damage the liver, kidney, bone marrow, blood, respiratory system, nervous system, immune system, etc., and some can even sensitize and cause cancer Daily life and office supplies For example, cosmetics, detergents, detergents, disinfectants, insecticides, textiles, inks, paints, dyestuffs, coatings, etc will emit formaldehyde and other kinds of volatile organic compounds, surfactants, etc These can affect the human body through the respiratory tract and skin Some harmful factors in the outdoor environment can also enter the indoor through various suitable media Common situations are as follows: when the concentration of pollutants in the air is higher than that in the room, they can enter the room through doors and windows, gaps, etc For example, particulate matter, SO2, NO2, polycyclic aromatic hydrocarbons and other harmful gases In the area with radium in the soil, radon and its daughters, the decay substance of radium, can enter the room through the gap at the entrance of the house foundation or the pipe of the house It can also be dissolved into groundwater first When groundwater is used indoors, it will escape into the air Radon concentration in the air of basement or bottom room can reach several hundred B9 / m3 The higher the floor is, the lower the concentration is Soil or natural water can contain a gram-negative bacterium, called Legionella It can enter the room with the cooling water of air conditioner, humidifier water or even the water column of shower head to form aerosol, and enter the human respiratory tract to cause lung infection, which is called Legionella pneumophila Brought in artificially Clothing, utensils, etc can bring pollutants such as lead dust from working environment or other outdoor environment into the room In addition to the above three sources, there are other sources For example, ultraviolet photochemistry can produce ozone In a word, the sources of indoor air pollutants are very wide and there are many kinds, which can cause various hazards to human health Moreover, pollutants can often exist in indoor air at the same time, which can act on human body at the same time and produce joint harmful effects Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,