[ Chinese wardrobe net ] Formaldehyde is a colorless, highly irritating smell of gas. Soluble in water, alcohol and ether. Formaldehyde is gaseous at normal temperature and usually appears as an aqueous solution. Soluble in water and ethanol, 35-40% aqueous formaldehyde solution is called formalin. A part of the formaldehyde escapes during evaporation, but most of it becomes melamine. It can be miscible with organic solvents such as water, ethanol and acetone. pH 2.8 to 4.0. The relative density (d2525) is 1.081 to 1.085. Melting point -118 ° C, boiling point -19.5 ° C. The refractive index (n20D) is 1.3746. A flash point of 60 ° C. Flammable. Low toxicity, half lethal dose (rat, oral) 800mG/kG. Its vapor can strongly stimulate the mucous membrane, is carcinogenic, and is highly toxic. Why does ordinary wood-based panels release formaldehyde? Ordinary artificial board = wood scrap + urea-formaldehyde resin Urea-formaldehyde resin is directly formed from urea and formaldehyde, and is widely used in the manufacture of wood-based panels. At present, most of the adhesives used in China's wood-based panels are urea-formaldehyde resins with formaldehyde as the main component. The residual and non-reactive formaldehyde in the plates will gradually release to the surrounding environment, forming a major source of formaldehyde pollution. Urea-formaldehyde resins are chemically unstable and will continue to decompose and release formaldehyde. How to make the sheet not release formaldehyde MDI ecological adhesives replace urea-formaldehyde resins. MDI is a widely used frontier polymer synthesis material. Because of its excellent safety and stability, it is also used in the fields of medical and daily necessities such as artificial blood vessels, heart valves, refrigerator liners, and Lycra fibers. MDI Eco Adhesive is a type of MDI downstream product used in building materials for making a variety of panels. The use of MDI eco-adhesive to make it into a plate not only solves the over-exploitation of forest resources, but also is expected to develop into the product with the most market development potential and industrialization prospects because it does not contain formaldehyde and is beneficial to people's home health. MDI is a general term for diphenylmethane diisocyanate (pure MDI), a mixture containing a certain proportion of pure MDI and polyphenylpolymethylene polyisocyanate (polymeric MDI), and a modification of pure MDI and polymeric MDI. The most important raw material, a small amount of MDI is applied to other aspects than polyurethane. Polyurethane has the elasticity of rubber, plastic strength and excellent processing properties, especially in the aspects of heat insulation, sound insulation, abrasion resistance, oil resistance, elasticity, etc. It is incomparable with other synthetic materials. It is followed by polyethylene and polychlorinated chlorine. The sixth largest plastics after ethylene, polypropylene, polystyrene and ABS have been widely used in national defense, aerospace, light industry, chemical, petroleum, textile, transportation, automobile, medical and other fields, and become indispensable for economic development and people's life. Emerging materials. Modifying the standard is the key to reducing formaldehyde release from the board Some people in the industry are reluctant to talk about formaldehyde, because changing the formaldehyde problem means giving up cheaper adhesives and increasing production costs. In addition, the overall added value of China's wood-based panel industry is not high, and the competition is fierce. Therefore, only a few large enterprises in the industry are using formaldehyde-free adhesives to produce low aldehyde boards or aldehyde-free boards. From the perspective of human settlements, life safety and the interests of consumers, we will establish a higher level of formaldehyde emission standards that can guarantee the unlimited use of plates in the living space, so that low aldehyde and aldehyde-free plates occupy market space. Artificial boards are better able to enter the international market. Although high standards will bring pain to some enterprises, if the problem of formaldehyde is solved, the prospects of the wood-based panel industry will become more and more broad. At present, the most stringent requirements for formaldehyde in the world are in Japan, and the highest standard requires that the amount of formaldehyde released should not exceed 0.3 mg. Wang Zheng suggested that the standards adopted for formaldehyde determination in China should be revised. Taking formaldehyde release as an example, it is not enough to have the level of release standards for plates. It is also necessary to consider the amount of these plates used in the living room, that is, the loading index, which limits the amount of high formaldehyde-exposed wood-based panel products used in the living room. Guarantee the air quality in the room. Sensor Waste Bin,Touchless Trash Can,Motion Sensor Trash Can,Stainless Steel Wastebin Qin Jian International Limited , https://www.luanbosmart.com