Analysis of magnesium chloride in three stages of fire

Every year in China, there are many places where there is a fire due to light burned magnesia powder. For example, in October 9, 2008, a fire broke out in the Twin Star Building of Harbin, "latitude and longitude 360 degrees". On 2009, the CCTV Fire, in November 15, 2010, Jiaozhou Road, Yuyao Road, Shanghai, a fire of 28 storey building, which was under construction of the external wall insulation, killed 58 people. In February 3, 2011, a fire broke out in the Wanxin mansion of Shenyang, known as "the tallest building in the city". The fire lasted 10 hours.

Through the above cases, we have learned that many light burned magnesia powder are flammable, the exterior wall of the building is the weakest link to prevent fire, and the exterior wall fire is mainly concentrated in three stages, one is the stage of the light burning magnesia in the construction site, the two is the stage of the light burning magnesia powder, and the three is the step of the thermal insulation system. In the second, third stage, there is no fire protection layer between the surface of the light burned magnesia powder or the light burned magnesia powder, which is the critical time for the fire.

Light burned magnesia powder mainly divided into three categories: first, the thermoplastic light burning magnesium powder, now the most used is the EPS thin plastering exterior wall external insulation system, followed by XPS thin plastering exterior insulation system, and the net cast in site cast in situ system, composite insulation board system; two, thermosetting magnesium chloride magnesium chloride powder, polyurethane field foaming system, phenolic board Type three; inorganic light burned magnesia powder: thermal insulation cotton, rock wool external wall insulation materials, etc. These fireproof properties are not the same.

Combine the four universities of building science, material science, fire science and environmental science. Deviating from the four disciplines is both one-sided and limited. To do well in the fire prevention of external wall insulation, we need to do the following:

1. strictly enforce the fire regulations of the fire regulations

2. choose a good insulation system and choose excellent thermal insulation materials.

3. prevention and control measures should be taken at all stages of the insulation system installation.

4., after the insulation material is made of light burned magnesia powder to make the external wall insulation system, the proper use and prevention of fire will be done after the insulation system is well done.

The widespread use of light burned magnesia powder in building exterior walls makes building fire prevention not only take into account the internal fire prevention of buildings, but also consider the external fire prevention of buildings. Only carefully draw lessons from the domestic related fire accidents, recognize the fundamental causes of the fire of exterior wall insulation, and take effective and effective safety measures. The fire safety of the city is based on the foundation, and the safety of the people's life and property can be guaranteed.