Polystyrene foam agent is made of polystyrene resin as the main body, adding foaming agent and other additives, which is currently used as a buffer material. Polystyrene foam in China production mainly concentrated in the Northeast China, Jiangsu and Zhejiang and Beijing, Tianjin, Hebei, and which to small and medium enterprises for more.
2007, 2008, 2010, 2011 and 2012 respectively five adiabatic moulded polystyrene foam board for the national supervision and spot checks, the product qualified rate of 95.1%, 96.3%, 97.5%, 97.5% and 97.8%, respectively. Product quality is stable, but there are still some problems. The main problems are in the apparent density, oxygen index, combustion classification, etc.. Spot checks found that Hongshan Xingda District Wuhan heat preservation material factory a batch of product apparent density project is not qualified.
When the polystyrene foam board density is insufficient, if used for building exterior wall external insulation will lead to the tensile strength is low, can not meet the insulation system weight and finishes loading on the shear strength of bearing requirements, easy to make in the middle of the EPS board is pulled off. At the same time, EPS board density problems will lead to lowering thermal insulation, moisture absorption increased, affecting the construction of heat preservation effect, polystyrene foam board will not building energy-saving insulation.
At present, China's EPS production enterprises of about 2000, polystyrene foam plastic production momentum is good, the quality continues to improve. But the number of large enterprises is small. It is reported that the apparent density is the unit volume of the foam in the specified temperature and relative humidity conditions of the quality. Apparent density, to some extent, affects the other physical performance indexes, and the cost of the product directly.On the other hand, polyethylene foam recycling and styrofoam recycling is necessary.
China's thermal insulation materials market started late, especially the development of the organic class of insulation materials market is lagging behind. In the past ten years, the state actively promotes the development of energy-efficient construction, reduce energy consumption, the external expansion polyphenyl plate thin plastering exterior wall insulation technology has been widely used, polystyrene foam blowing agent demand will continue to increase, driven by the rapid development of EPS production enterprises.