Polyurethane materials, which were not very familiar to the public, have recently received much attention from all walks of life. This is due to November 15, 2010 A major fire accident in a high-rise apartment in Shanghai caused a tragedy of dozens of deaths. The exterior insulation material of the building is made of polyurethane rigid foam material. Some people question whether the polyurethane material itself has safety problems. Should it be banned? December 30, 2010 At the symposium on fire safety of polyurethane building energy-saving materials held in Beijing, experts from industry associations, institutes and research institutes, and CEOs of key domestic and foreign polyurethane companies, on the properties, use methods, construction management, safety supervision and other topics of polyurethane materials Conduct a heated discussion.
Li Yongwu, president of the China Petroleum and Chemical Industry Federation, stressed that the polyurethane industry has been developing in China for more than 40 years and has become one of the fastest growing industries in the chemical industry. Polyurethane is widely used in various fields of national economy and daily life due to its excellent performance. From rocket to airplane, from building construction to refrigerator freezer, the preferred thermal insulation material is polyurethane; in textile, electronic device and other industries, polyurethane Soft foam materials are also widely used. Li Jianbo, deputy secretary-general of China Polyurethane Industry Association, told reporters: "Polyurethane materials are an indispensable basic material for national economic and social development. The advantages of heat preservation, safety and human health are still no other materials." Road, in December 21, 2010 At the 18th meeting of the 11th National People's Congress Standing Committee, Vice Chairman Hua Jianmin emphasized that it is necessary to vigorously strengthen the building energy conservation work, strive to improve the energy efficiency of construction, further improve the supporting regulations, policies and standards, and increase law enforcement; Deepen reform and establish a long-term mechanism for energy conservation. It shows that the country attaches great importance to building energy conservation.
So, what is the cause of the " 11 • 15 " mega-fire? The reporter learned from relevant parties that the current conclusion of the accident has not been announced by the State Administration of Work Safety. The preliminary investigation results of the Shanghai Fire Department indicate that the building exterior wall uses polyurethane materials. However, the Shanghai Fire Department disclosed that the fire occurred on the 10th floor of this residential building. From the fire image, the polyurethane rigid foam material below 9 layers is basically intact and there is no sign of burning. It should be said that as long as a layer of concrete mortar is applied to the outside of the polyurethane insulation material, it can be ensured that the polyurethane material is not ignited by fire, which is a standard construction method. As the conclusion of the accident has yet to be announced, the relevant person in charge of the China Polyurethane Industry Association said that it is not convenient to express his views on the Shanghai fire. However, whether the building exterior wall insulation material is safe or not, standard construction is an important part, and it is also important that the polyurethane material itself meets the relevant national technical standards.
Zhou Zhengyu, secretary-general of the China Flame Retardant Society, told reporters that according to the national classification of the burning performance of building materials, polyurethane materials are classified into B1 (flame retardant), B2 (combustible), B3 (flammable), and B2 or higher. Can be used for exterior wall insulation, that is, not all polyurethane materials are flammable. At present, China's construction and other industries that need to use thermal insulation materials can produce B1 and B2 polyurethane materials according to different specifications. However, in order to pursue profits, some construction companies often use low-priced B3 polyurethane materials for building exterior wall insulation, and if there is no standard coating of building mortar on the outside of polyurethane materials, fires may cause fire accidents. occur. September 20, 2008 The catastrophic fire that occurred in a club in Shenzhen caused a tragedy of 44 deaths. It was investigated using a flammable B3 grade polyurethane material. It can be said that the cause of the fire accident should be carefully analyzed, and it cannot be determined that the polyurethane is not safe without analysis.
Experts from the Institute of Building Fire Protection of the China Academy of Building Research said that polyurethane materials are used for building exterior wall insulation and cannot be replaced by other materials. Although inorganic materials such as rock wool and mineral wool can also be used for building exterior wall insulation, due to limited mineral resources, non-renewable, protective mining is required, and rock wool and other construction workers will cause respiratory system occupational diseases, so inorganic materials are still Cannot be compared to polyurethane materials. In this case, whether it is in the field of polyurethane manufacturing or in the use or consumption of buildings, electronic devices, etc., it is necessary to strengthen management and standard operation to ensure safety.
In response to public concerns about the safety of insulation materials, Li Jianbo said that only the standard operation can ensure safety, and the safety of qualified polyurethane materials can be assured. Li Yongwu particularly emphasized that it is necessary to strengthen the safety management of construction sites and implement construction in accordance with standards. He suggested that the development of safety management standards for construction sites should be speeded up. This is an effective measure to curb the frequent occurrence of fires on construction sites. Strengthen the supervision of building insulation materials. The relevant state departments have formulated the construction insulation permit system and the management of deposits and insurance. Measures. At the same time, we must strengthen industry self-discipline, establish a healthy and orderly market, and fulfill social responsibilities.
(Responsible editor Guo Fengqin)
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