There is still a lot of room for the future of polyurethane material industry
There is still a lot of room for the future of polyurethane material industry
In recent years, China's rapid development of the market building energy-saving wall insulation, thermal insulation system products emerge in endlessly, but in front of the fire accident emergency, a lot of heat preservation material is very weak, the management departments at various levels strictly to strengthen the wall thermal insulation material in the fire protection problems in the process of popularization and application, its importance is far more than any time in the past. How to ensure that the building materials have fireproof performance, can prevent the fire when the fire breaks out, becomes a very important index to measure whether the building is qualified.
To prevent fire accidents, on October 1, 2013, the ministry of public security fire department officially released the ? building materials and products of combustion performance grading ? (GB8624-2012) national standards, which replaces the original standard GB8624-2006 "building materials and products of combustion performance classification", to the division of application products of combustion performance rating and grading criterion for the modification, increase the combustion performance of special-purpose products classification, modified the additional information and combustion performance rating marks, etc. Promulgation and the implementation of the standard to improve the practical application of building materials and products in fire safety and reduce the fire hazard, regulating the supervision and administration of enterprise production and facilitate the supervision department play an important role.
In many materials, heat preservation system in many in fire indices of thermal insulation material, polyurethane as a kind of the best heat preservation material, in domestic has been widely applied in the construction, for the country's building energy conservation has made great contribution to the business. However, because of people's cognition to the very limited, plus some insulation fire accidents in recent years, and even don't know much about the market for pu heat preservation material produce misunderstanding on and construction units in construction process of shoddy phenomenon common occurance, lower prices and inferior products flooding the market in great quantities, and so on factors have hindered the healthy development of polyurethane materials.
It is important to understand the structure and application of polyurethane in detail to understand the thermal insulation performance of polyurethane and its fire-retardant properties.
Called the pu polyurethane, is on the main chain containing duplicate carbamate groups of macromolecular compounds collectively, it is by organic diisocyanate isocyanate with two or more hydroxyl or polyol addition polymerization. Polyurethane material USES is very wide, can substitute for rubber, plastic, nylon and other materials, widely used in all kinds of buildings, its resistance to deformation ability is strong, not easy craze, facing stability, security, and such products of low thermal conductivity, thermal performance is good, it is the lowest heat preservation material coefficient of thermal conductivity of excellent thermal insulation products, this product belongs to the hydrophobic material, moisture-proof, waterproof performance and special superiority, also has the freezing-thawing resisting ability. What is worth mentioning, polyurethane, after adding flame retardant is a kind of flame retardant material, self-extinguishing its softening point can reach more than 250 degrees Celsius, will appear only in high temperature decomposition, even burning situation of the polyurethane appear again will form carbon deposition in the bubble surface, this layer of carbon help to isolate the bubble below, can effectively prevent the spread of flame, this kind of excellent fire, flame retardant, high temperature resistant performance is a incomparable other class insulation products. Produced by this kind of polyurethane pu heat preservation material, its fire prevention performance and even can achieve B1 level standard requirements, are many insulation plate in one of the few good thermal insulation products, is becoming more and more be taken seriously in fire problem, choose thermosetting polyurethane with B1 level fire prevention requirement is not the choice of two markets. Despite the polyurethane insulation board with such outstanding performance, but in the practical application of marketing, due to the overwhelming majority of manufacturers are constrained by the production equipment and production technology, meet the requirements of construction for safety and energy saving, but because the price factors make the promotion work.
In fact, the market of exterior wall thermal insulation products polyurethane insulation materials mostly under B2 flame retardant grade, oxygen index less than 26, this level can only be conducted on B1 level required materials of construction price of vicious competition, to occupy a certain market share. It is said to be an unspoken and open secret in architecture, and it is not surprising that fires are prone to fire. According to the requirements of the national standard GB8624-2012, polyurethane can achieve B1 level, but most of the factories produce the B1 level according to the standard products, due to its production process USES the method of adding flame retardant increased to improve the flame retardant performance, influence the number of the receiver, and by increasing the density to meet the requirements of the size stability, which in turn increases the costs. In this situation, the market situation is shoddy, and the low-level impersonation of a high-level fire grade is often occurring, and the security of the building itself is hidden.
According to relevant data, polyurethane insulation materials are widely used in foreign markets. The application of polyurethane insulation materials in the us is 57%, over 32% in Japan. Building insulation materials market in China, by contrast, in the application of polyurethane accounted for less than 10%, even in this case, because of its safety and energy efficiency of irreplaceability, polyurethane industry in our country every year or in the high speed development in high speed. In reference to the situation in developed countries, there is room for improvement in the future.
But, in our country each year under construction and completed the project, the fire accident, including some project USES is polyurethane composite board exterior insulation system, since this will give the construction unit, construction unit, relevant departments and people caused a misunderstanding: polyurethane thermal insulation performance is not good, fire prevention performance is poor. Clearly, this misconception is not supposed to be the entire polyurethane industry, and the damage to the entire industry should not exist.
All of which can only be verified by more practical engineering applications to verify that the thermal insulation performance of polyurethane is good, which is worth vigorously promoting the application. In the process of popularization and application, of course, we should close down backward production facilities, to purify the industry market, strengthen the regulation of industry market, only the pu industry together, use the actual action to prove to the market: polyurethane thermal insulation and fire prevention, trustworthy.
Live and live, choose polyurethane, the application value is endless
