日期：2022/7/2 8:44:38 / 閱讀： / 來源：本站
Polystyrene foamThere are many applications of polystyrene foam in roof waterproof and thermal insulation at home and abroad. In recent years, a new type of waterproof and thermal insulation roof - inverted roof is gradually popularized. The basic process of roof inverted thermal insulation method is as follows: ① make a leveling layer on the structural layer of the roof. ② Make a waterproof layer. ③ Lay thermal insulation layer (polystyrene foam, etc.). ④ A layer of non-woven fabric is laid on the polystyrene foam. ⑤ The top layer is a protective layer. The advantage of inverted roof insulation is that it can completely solve the problem of roof leakage. The waterproof layer of the traditional roof insulation structure is above the insulation layer. With the long-term solar radiation and wind and rain erosion, the aging of the waterproof layer causes degradation, leading to the cracking of the waterproof layer, resulting in leakage, and the thermal insulation performance of the insulation layer decreases due to water absorption. Inverted roof insulation puts the insulation layer on the waterproof layer, the working environment of the waterproof layer is changed, and the waterproof function can be effective for a long time. Moreover, due to the use of high-density polystyrene foam board, the insulation effect is guaranteed. Coating composite production line www.handern com
The polystyrene foam used for inverted roof insulation is molded polystyrene foam (EPS) and extruded polystyrene foam (XPS). Extruded polystyrene foam (XPS) board is a polystyrene foam board produced by extrusion method. Extruded polystyrene foam (XPS) board was developed by the Dow Chemical Company in the 1940s. It is still the largest supplier of extruded polystyrene foam (XPS) board in the world, and its trade name is "stymfoam". In addition, there are owenscot Ning in the United States and BASF in Germany. Its structure is numerous green small independent closed bubbles, and its performance is characterized by high strength, low thermal conductivity, small steam penetration coefficient, low water absorption, and stable long-term use performance. Coating composite production line www.handern com
XPS board with extrusion method is mainly used for roof inverted insulation in foreign countries. XPS board (trade name: poofmate SL board) recommended by Dow Chemical for roof inverted insulation has a compressive strength of 300kPa and a design bearing capacity of 110kpa, but it is difficult to promote in China due to its high price. The price of domestic EPS board is quite different from that of XPS board. Some units have made experiments on the application of EPS board in the inverted insulation of roof machine, and have achieved successful experience. At present, domestic polystyrene foam sheet manufacturers have produced density of 50~60kg/m 3 The compressive strength of EPS board can reach more than 400kPa. If you are worried about the poor water absorption of EPS board, you can apply waterproof paint on the surface of EPS board. Even so, its construction cost is still much lower than XPS board, and its use performance is similar. Therefore, it is feasible to apply PS board to roof inverted insulation, which should be further tested and popularized.
(3) Thermal insulation polystyrene foam board the method of using polyethylene foam as external insulation of external walls has a history of many years abroad, which is called "EIFS" (exterior insulation&finish system). After entering the Chinese market, this set of technology and supporting materials is called "special Witt" system, but in fact it is only the trademark of an American company specializing in exterior wall insulation and finishing. The definition of "EIFS" refers to the tea vinyl foam board (self extinguishing EPS with a density of 18~20kg/ ㎡ and its fiber mesh reinforced poly (vinyl chloride) film composite production line www.www.dressup9x.com, which will be used as heat insulation material through the bonding and solidification method
American companies engaged in EIFS have the following technical requirements for polystyrene foam board. The compound is sand packed, and the outermost layer is decorative paint. ① Raw materials. For expandable polystyrene resin, grinding recycled raw materials shall not be used. ② Ball melting. 80% or better, no visible empty home. (20 ℃) can also be heated and dried at 60 ℃ for 5 days to stabilize the shrinkage. ④ Ruler 1200mmx609mm, minimum thickness 25.4mm, maximum thickness 101.6mm, 12m flatness ± 0.8mm, right angle ± 0.8mm (every 30.5cm). Density. 14.6~17.6kg/m 3。 ⑥ Combustion performance. The flame diffusion index is less than 25, and the smoke development index is less than 85. ⑦ Thermal performance. Thermal conductivity at 4 ℃ x0.035w/ (m · K). ⑧ Strength index. The compressive strength (at 10% deformation) is 89.6~117.2 kPa, the bending strength is 193.1~241.3kpa, and the tensile strength is 110.3~137.9kpa. ⑨ Water absorption. Volume water absorption is less than 2%. See table 4-27 for the thermal performance of EIFS system composed of EPS plates with different thicknesses. Table 4-27 thermal performance coating composite production line of EIFS system composed of EPS plates with different thicknesses www.handern com