The energy issue has become a major issue for economic development and social stability in all countries of the world, and it is also a major issue that humankind must solve for sustainable development. Energy conservation is an important aspect of energy development. The proportion of building energy consumption in the total energy consumption of countries has reached 30%-40%, and China has reached 27.6%, and there is a growing trend. Therefore, we must vigorously develop green energy-saving buildings and improve energy efficiency.
The use of forest residues to develop practical new products to meet the needs of various industries is a major direction for the development of the wood industry. China has relatively little research in this area. Therefore, in this paper, the Feasibility Fund project for the thermal insulation, thermal insulation, and sound insulation of composite materials using forest residues is carried out: Heilongjiang “H HDPE+ rice husk powder wood plastic composite material with temperature changes, its bending performance Each parameter has a linear change; while the parameters of the PP + wood flour wood-plastic composites are all better with quadratic curve fitting.
HDPE + rice hull powder wood plastic composite material still has bending failure at the highest temperature of 85 °C, while PP + wood powder wood plastic composite material basically has no bending damage to 65 °C, to 70 ° when there is no bending damage.
In the maximum bending strength of the maximum stress diagram, HDPE + rice hull powder wood-plastic composite material changes steeply at 35C to 45°C, 55°C to 65°C, 75C to 85C; and PP+ wood flour wood-plastic composite material is clearly divided into In the third stage, the change of the bending performance parameter of the 35°C to PP+ wood flour wood-plastic composite material at a temperature rise of 40C is larger than that of the HDPE+ rice hull powder wood-plastic composite material temperature rise of 50C.
When the maximum stress of HDPE+ rice hull powder wood-plastic composite material changes at 45C and that of PP+wood powder wood-plastic composite material at 55C, a new application field is developed for the development of forest residue, and it also provides a New thermal insulation material.
1 Domestic and foreign trends in the development of wood insulation materials The study of insulation materials using forest raw materials is relatively early in foreign countries. Japan has made great progress in the research of wood fiber and polystyrene foam compounding, shavings, and rigid foamed polyurethane composites; the Forest Products Research Institute of the US Forest Service also uses hemlock fiber and polyurethane, polystyrene and other foams. It has developed a series of wood fiber composite insulation materials for thermal insulation in the fields of construction, chemical engineering and power plants.
In China, there are still few researches on the manufacture of heat preservation materials composited with forest residue and polystyrene foam beads, which mainly focus on the research and development of the process of the development of plant fiber cushion packaging materials, and the use of added chemical foaming agents. The amplitude of change in the south is similar, but the bending elastic modulus E of the former changes more at 45C than the latter at 55C.
3 Conclusions The following conclusions can be drawn from tests: The flexural performance of both HDPE/PP wood-plastic composites decreases significantly with increasing temperature.
Both HDPE/PP wood-plastic composites should be avoided at higher temperatures >55.0.
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