At the beginning of this year, more than ten provinces for rain and snow, local cooling more than 10 ℃, so cold weather, how we live in housing can be compatible with energy-saving insulation and fire safety has become the topic of the most affect the hearts of the people, especially in the north Of the residents, the side of the situation is because the room heating is very hot, but the room temperature is not up and worry, while worried about the insulation material will be added there is a security risk?
After all, not long ago the Shanghai fire to a lot of people on the hearts of polystyrene, polyurethane insulation materials like a lot of grudges, how can we achieve energy-saving environmental protection and safety fire comprehensive? This is where the livelihood of the people concerned, is also the construction materials industry mission lies, it is the responsibility of national construction! Who can take on this task?
As we all know, polyurethane foam is an excellent energy-saving insulation materials, almost all of the current refrigerator, freezer, freezer, water heater insulation materials are used polyurethane foam. Then the polyurethane foam insulation in the building exterior insulation can be safely applied? 1. What is the root cause of frequent fire accidents in construction site insulation materials? How can truly energy-saving environmental protection and fire safety both? In response to these problems, various industry experts offer advice and suggestions.
First of all, from the insulation effect, the polyurethane foam for the building exterior wall insulation will undoubtedly achieve excellent insulation effect. In short, the home of the refrigerator with insulation materials used in the wall, the insulation effect is self-evident.
Secondly, from the matching with the building point of view, the Chinese Building Research Institute of Building Materials by a large number of studies have shown that rigid polyurethane foam can meet the relevant national standards, with good weather resistance and building matching. "External wall insulation system technical regulations" and "rigid polyurethane foam insulation board" and other related industry standards are currently approved, will soon form a comprehensive industry-standard specifications.
Third, from the fire safety point of view, polyurethane foam is a thermosetting foam, the foam itself is divided into B1 (flame retardant grade), B2 (flammable grade), B3 (flammable grade) three (grading method GB8624-1997) Can also be combined with some inorganic insulation materials to make A-level composite non-combustible materials.
China's current standard requirements, used in building exterior insulation materials, the combustion performance shall not be less than B2 level, polyurethane rigid foam can meet the requirements. B2-class polyurethane foam in the fire environment will be carbonized, will not produce combustion drip, combustion of the flue gas is mainly carbon monoxide, carbon dioxide, nitrogen oxides and a very trace of hydrogen cyanide. These substances and our common wood, leather, wool, natural products such as the burning of the product is the same, and no special risk. China Building Research Institute of fire has carried out 14 times the polyurethane foam insulation wall model fire experiment (experimental methods in accordance with the British experimental standard BS8414-1) have shown that B2-level polyurethane foam plaster system does not have a thin flame spread , The combustion process to maintain stability, did not produce crashing and collapsing off phenomenon.
From the relevant reports can be aware that the accident is the main reason: First, the welder undocumented posts, illegal operations, the laying of the insulation material is not taken after the fire protection measures to be hot work; the second is not used to achieve B2 standard Flammable materials; third project sub-sub-package, followed by safety oversight. This is as the state requires the use of high-grade rebar in the bridge, the use of low-grade rebar in general construction, not because of the use of illegal construction in the bridge of low-grade rebar construction caused a vicious incident, and that thread Steel is not suitable for use in bridges.
So how to avoid the recurrence of similar incidents? The key point is whether the selection and construction process in the strict implementation of national regulations and industry standards of self-discipline.
China's building fire safety norms is based on a large number of experiments, fully learn from foreign experience, and taking into account China's national conditions and developed, is scientific and effective, can fully guarantee building fire safety; Fire safety to be treated differently, to strengthen the construction site management is to curb the construction site fire frequently effective measures, we can not completely improve the technical requirements to solve the management problems.
In this regard, the China Petrochemical Federation proposed: "On the one hand to speed up the construction site safety management standards, strengthen the construction site safety management and supervision, in strict accordance with the norms of construction.On the other hand, insulation materials industry to strengthen technology research and development and industry self- Production and use of thermal insulation materials in line with national standards requirements of the fire insulation materials to improve the safety of insulation materials to eliminate unqualified products into the market.
It is understood that China's polyurethane industry has more than 20,000 enterprises, polyurethane annual output of 600 million tons, accounting for 36% of global output, output value has more than 120 billion. Global polyurethane production in 2010 is expected to 18 million tons, of which for the construction of the total area of 30% insulation. With the acceleration of urbanization in China and the increasing consumption of construction, automobile and household appliances, especially the "low-carbon environmental protection" concept, China will become the world's largest polyurethane production and consumption center. Polyurethane play a compatible energy-saving insulation and fire safety building materials is undoubtedly a long way to go.