Building energy consumption currently accounts for about one-third of the total energy consumption of the whole society, including energy consumption for heating and cooling in building applications and energy consumption for building materials. China's climate is characterized by four distinct seasons, most of which are cold and hot in winter. With the improvement of living standards, the energy consumption of heating and cooling is growing rapidly. In the past, there were only cold and cold areas in the north, and air conditioning was rarely used in summer. It is now quite common to have air conditioning in the winter and heating in the summer, so the proportion of energy consumption in the construction industry in total social energy consumption is increasing year by year. Nowadays, many cities have formed electricity climaxes in winter and summer, and even restricted industrial electricity to protect residents' electricity.
The energy consumption of heating and cooling depends on the thermal insulation properties of the building (the so-called thermal performance of the envelope) and the thermal efficiency of the heating and cooling system. According to the investigation by the Ministry of Construction, because of the poor thermal insulation performance of China's building envelopes, the energy efficiency of heating and air-conditioning systems is low, and the energy consumption of buildings is seriously wasted. Now China's heating energy per unit area is about 3-4 times higher than that of developed countries with close climatic conditions. . Recently, the hottest topic in China's construction industry is building energy efficiency. Governments at all levels from the central to local governments are vigorously promoting. China's 'construction cause's 11th Five-Year Plan' requires new buildings to strictly implement design standards of 50% energy conservation, and conditional large cities and cold and cold regions to start energy-saving design standards for new buildings with 65% energy efficiency, while vigorously carrying out existing Energy-saving renovation of residential and public buildings. The development and application of construction plastics in the unprecedented ¡®building energy conservation boom¡¯ has received extensive attention.
At the same time, the energy consumption lost through the envelope during heating and cooling in building energy accounts for a large proportion. Experience in countries around the world has shown that improving the thermal performance of building envelopes can significantly reduce energy consumption. In order to meet the requirements of thermal insulation for exterior walls and roofs, low heat transfer materials must be used in the structure. Traditional enclosure materials are difficult or even impossible to achieve. Therefore, the exterior walls and roofs that require energy-saving buildings are usually made of composite structures, and there is a layer of high-insulation building materials in the structure. There are many types of thermal insulation materials for construction, such as foam cement, rock wool, glass wool, foam, etc., each with its own advantages and disadvantages and scope of application. However, after many years of practice, China's construction industry has recognized that foam foam is the most competitive thermal insulation material in most occasions. The main advantages are good thermal insulation performance, light weight, no water absorption, convenient construction and low price.
The contribution of development and application of plastics to energy conservation can be seen in every field. In addition to being lightweight, it often comes from other unique properties of plastics such as abrasion resistance and corrosion resistance. Because of its long service life, it is energy saving. For example, oil pipelines for oil extraction have used steel pipes in the past because Pei pipe steel pipes have poor corrosion resistance and low service life. According to the investigation by the Shengli Oilfield Administration, the general steel pipe will be replaced after corrosion for 4-5 years. In recent years, China has increasingly adopted various reinforced plastic pipes, including glass steel pipes and reinforced composite plastic pipes RTP.
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