With the rapid growth of the real estate industry in recent years and the increasing investment in infrastructure by the state, China's plastic building materials industry has become the second pillar industry in the plastics industry, which is second only to packaging. Plastic building materials can not only replace steel and wood in large quantities. Moreover, it has excellent performance unmatched by some traditional building materials, which can significantly save energy, protect the environment, improve living environment and conditions, and improve building functions. With the continuous improvement of plastic building materials technology, its promotion and application will surely develop rapidly.
1. Shock absorption and silence
Since the matrix polymerization of plastic is a viscoelastic material, when the plastic is subjected to mechanical shock, full motion and sonic shock, the internal friction of the viscoelasticity is generated, and the wave transmission speed, amplitude, frequency, etc. are greatly reduced, especially foam plastic, especially Suitable for damping noise-reducing materials.
2. Adiabatic insulation is good
The thermal conductivity of plastic is only a few thousandth to a few hundredth of that of metal. It is a poor conductor or insulator of heat. It has good heat preservation and can be used as insulation board and cold storage board. It is a good building energy-saving material. .
3. Heat resistance
In general, plastics have poor heat resistance. Ordinary thermoplastics have a heat distortion temperature of only 60 to 120 ° C. The heat resistance of thermosetting plastics is good, but generally only about 150 C. The heat resistance temperature of engineering plastics with the best heat resistance is 400 ° C. about. Therefore, some building products used at higher temperatures should be used with caution when using plastic materials. In addition, understanding this property of plastics can also correctly grasp the construction and maintenance methods of plastic building materials.
4. Flame resistance
Plastics are generally flammable, which is a weakness when used as a building material. Some plastics are not only flammable, but also accompanied by the release of toxic gases and a large amount of smoke during combustion. Therefore, plastics must be taken seriously as building materials, and necessary measures should be taken to prevent their flammability. For example, artificial flame retardant, inorganic filler, etc. can be added to improve its flame retardancy, making it a product with better flame resistance than wood, self-extinguishing and flame retardant. It is believed that with the rapid development of the plastics auxiliaries industry, it will be a near-term thing to produce flame retardant plastic building materials with excellent performance.
5. Thermal scalability
The coefficient of thermal expansion of plastics is 3-4 times higher than that of conventional materials, so this should be taken into account when constructing and using plastic building products to prevent material damage due to the accumulation of thermal stress. For example, the connection of plastic siding should be fixed by flexible connection, so that the board has room for expansion; there must be a sufficient number of expansion joints in the plastic piping system.
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