Comparison between the hottest aluminum alloy door

2022-08-24
  • Detail

Comparison between aluminum alloy doors and windows and plastic steel doors and windows

I. wind pressure resistance and watertightness:

plastic steel doors and windows are about two grades lower than aluminum alloy doors and windows because of their low material strength and rigidity, although they are reinforced by adding lining stiffness. This is the case with the standard sample window submitted by the enterprise for inspection, and the same is true with the sampling at the construction site. Shanghai building curtain wall Testing Center divides the process performance and experimental methods of stainless steel for aluminum alloy doors installed on the construction site into the following categories: windows and plastic steel doors and windows adopt witness sampling method to carry out the average value of "three performance" measurement; "In addition to air tightness, the water tightness and wind pressure resistance of plastic steel doors and windows are worse than those of aluminum alloy doors and windows. This result is unexpected, but after further analysis, it reflects the important problems in the quality of plastic steel doors and windows.". Moreover, because the lining steel of plastic steel doors and windows is not connected into a complete frame system in the corner of its profile, the plastic welding angle strength of window frames, leaf corners and T-joints is relatively low

II. Air tightness:

plastic steel doors and windows because the frame and leaf components are welded, their air tightness should be slightly better than screw connected aluminum alloy doors and windows, but the size accuracy of aluminum alloy doors and windows is higher, and the frame and leaf fit closely, so they are still at the same level

III. thermal insulation performance:

the thermal insulation performance of aluminum alloy six windows is not as good as plastic steel doors and windows, but because, according to the calculation formula of thermal conductivity of windows, k=1/(1/ai+rw+1/ae), the value of heat transfer coefficient K of windows depends not only on the heat transfer resistance RW of the window itself (the inverse of the heat transfer coefficient of the window itself), but also on the window. The indoor and outdoor surface heat transfer coefficients AI and AE; According to another calculation formula k=k frame · f+k glass · (1-f), the heat transfer coefficient K of the window is composed of K frame and K glass of window frame, leaf component and window glass, which is directly related to the ratio of window frame and leaf to the area of the whole window F, while the area of aluminum alloy window frame and leaf is 10% smaller than that of plastic steel doors and windows, and the aluminum door and window frame and leaf profile is not solid, and the wall thickness of hollow aluminum profile (actual thermal bridge) is about 40% smaller than that of plastic profile

IV. lighting performance:

the lighting performance of plastic steel doors and windows is worse than that of aluminum alloy doors and windows. The shading area of its frame and leaf components is about 10% larger than that of aluminum alloy doors and windows, and the vision and decorative effect are poor, which is not conducive to building lighting energy conservation and consumption reduction

v. sound insulation performance:

the sound insulation performance of windows mainly lies in the sound insulation effect of glass, which accounts for about 80% of the window area. The gap sealing level of aluminum alloy doors and windows is basically the same as that of plastic steel doors and windows, and their sound insulation performance is also basically the same Shanghai Academy of Building Sciences has carried out a series of sound insulation performance measurement and comparative experiments on plastic steel doors and windows and aluminum alloy doors and windows (6); The sound insulation of 5mm thick single glass plastic steel doors and windows is about 21~24db; The hollow single frame double glass plastic steel doors and windows of 5+12a+5 are 24~29db; The sound insulation loss of double glass is about 5dB greater than that of single glass; Plastic steel doors and windows and aluminum alloy doors and windows "under the conditions of the same glass thickness, structure and similar sealing conditions, their weighted sound insulation RW values are similar"

VI. fire resistance:

the fire resistance of fire-resistant PVC plastic doors and windows is better than that of combustible wood doors and windows, but it is poor compared with non combustible aluminum alloy doors and windows. PVC plastic is a non combustible material. Under the action of fire, it will burn slowly after encountering an open fire, and it will self extinguish if it leaves the fire. Its flame retardant mechanism is that the hydrogen chloride released during combustion has the function of catching h, oh and free radicals, and becomes flame retardant (7). Hclcoco2 and other toxic gases are released during combustion. The harm of smoke is the main cause of heavy casualties in building fires. Therefore, some European countries stipulate that PVC doors and windows shall not be used in public buildings to avoid unnecessary injury. About the fire resistance of doors and windows: steel doors and windows and aluminum doors and windows are relatively good, while plastic doors and windows and wooden doors and windows are relatively poor

VII. About lightning protection and static electricity:

aluminum alloy is a good conductor, so when it is used as the peripheral structure of the building, effective grounding measures can be used as lightning protection facilities and static electricity can be prevented; PVC plastic is a non-conductive insulator, which cannot solve the problem of side lightning protection when it is used in high-rise buildings (class I lightning protection buildings more than 30m, class II lightning protection buildings more than 45m, class III lightning protection buildings more than 60m, represented by AK). Moreover, if it is not treated with anti-static treatment, when it is used in civil buildings, the dust collection and fouling of static electricity are difficult to clean, affecting the appearance and decoration; Industrial buildings cannot be used in explosive workshops such as dust, electronic or electrical assembly workshops and computer rooms. According to the information, for electrostatic fire fighting of plastics, anti-static oil containing quaternary amine salt can be applied on its surface, which can absorb water in the air and increase conductivity. However, at present, domestic plastic doors and windows have not been treated with anti-static paint

VIII. Decoration:

plastic doors and windows, as external windows of buildings, can only be mainly white. Because white or light gray PVC profiles have good weather resistance and light stability, they are not easy to absorb heat. The heat resistance and weather resistance of colored PVC profiles are greatly reduced, and they can only be used indoors. Generally, we should improve the printing situation. Temperature color decoration is very important to the effect of architectural art. The single white color of plastic doors and windows is a huge defect, which can not meet the needs of various kinds of building exterior wall decoration. Relatively speaking, aluminum doors and windows have a variety of surface treatment technologies such as powder spraying, anodizing, electrophoretic coating, wood grain transfer processing, etc., and their surface colors have a wide range of choices, including white, green and other colors, as well as wood grain, granite and other surface colors

IX. aging problem:

aluminum alloy profiles are durable, and there is no aging problem, while PVC plastic profiles do age. At present, China's plastic doors and windows basically adopt the lead salt system formula of Germany and Austria, and some enterprises use the organic tin system formula of the United States. Domestic artificial accelerated light aging experiments show that all white profiles containing lead salt system are easy to be colored and polluted after light aging, and the color turns significantly yellow after 1500 hours of irradiation. The price of lead salt system is slightly lower, but the appearance color and durability are far inferior to organotin stable system. Data shows that the smooth surface of plastic doors and windows in Germany will become rougher after weathering in the first year. The comparison photos after more than ten years show the weathering process of PVC profile surface. When the thickness of the weathered layer reaches 0.3~0.4mm, the decomposition of the lower layer of PVC will stop. Under the action of ultraviolet light, most of the chains of high molecular PVC resin are broken, which makes the surface of the material lose luster, discolor and pulverize, and the mechanical properties of the profile are reduced. In doors and windows of similar buildings, steel doors and windows are easy to rust, and wooden doors and windows are easy to be damaged, and their service life is generally not long

X. deformation and expansion problems:

plastic steel doors and windows are easy to be deformed by heat, brittle when cold, and have poor dimensional and shape stability. It is often necessary to use the rigidity of glass to prevent the deformation of window frames. Therefore, plastic windows are installed in the factory before leaving the factory in foreign countries to prevent deformation during storage, transportation and installation. In addition, during installation, the space between the window frame and the hole is sealed with a cured elastomer filled with foamed plastic. But it should be formed after drying; However, due to the construction habits of China's construction industry, plastic steel doors and windows are not equipped with glass when leaving the factory, and cement mortar is used to fill the gap between the window frame and the hole during installation. "The coefficient of thermal expansion of PVC plastic steel door and window frames is far greater than that of steel, aluminum and cement. When the temperature difference between day and night in winter and summer reaches 20 ~ 700C, PVC plastic steel door and window frames will be" squeezed "so that they cannot expand and contract freely and produce deformation

Xi. Product weight:

plastic steel doors and windows are lighter than aluminum alloy windows. As the tensile strength of plastic profile is 1/3 of aluminum profile and the modulus of elasticity is 1/36 of aluminum profile, the cross-sectional size and wall thickness of plastic profile must be designed to be larger than that of aluminum alloy profile, and reinforced steel lining must be added in the profile cavity to meet the wind pressure resistance of windows and the needs of assembling hardware accessories. The plastic steel doors and windows improved by European windows in China have a profile wall thickness of 2~2.5mm and a profile consumption of 9~12kg/m2. The consumption of steel lining is 7.65~10.2kg/m2 based on the fact that the consumption of steel lining is 85% of the weight of the profile. Therefore, the weight of plastic window with steel lining has exceeded the weight of aluminum window profile by 4.5~7.5kg/m2 In addition, steel doors and windows and solid wood doors and windows are generally bulky

XII. Production energy consumption and use energy consumption:

the ratio of production energy consumption per unit volume of profiles for aluminum alloy doors and windows and plastic steel doors and windows is 8.8 times, but the ratio of production energy consumption per unit area of profiles is 2.55 times. For the use energy consumption of windows, compared with the heat transfer coefficient measured under the thermal insulation condition in winter, it can only be said that the heating and thermal insulation energy consumption of plastic steel doors and windows is 27 ~ 31% lower than that of aluminum alloy doors and windows. Because the heat transfer coefficient of windows in summer is different from that in winter, it cannot be simply said that the cooling energy consumption effect of air conditioning in summer is the same. The thermal insulation performance of windows in summer is different from that in winter, so they cannot be simply confused

XIII. Profile mold cost:

from the perspective of profile extrusion mold opening cost, plastic windows and steel windows are about three times that of aluminum alloy windows. The economy and flexibility of developing and upgrading aluminum alloy doors and windows are better than plastic steel doors and windows

XIV. Product performance/price ratio:

the performance/price ratio of aluminum alloy doors and windows is higher than that of plastic steel doors and windows. The price of aluminum alloy doors and windows abroad is 1.5 times that of plastic steel doors and windows, that is, the price of plastic steel doors and windows is 33% cheaper than aluminum doors and windows. However, the situation in our country is just the opposite. In the general market, the price of single glass plastic steel doors and windows is 25-33% higher than that of aluminum alloy doors and windows; The price of hollow double glass plastic steel doors and windows is 36-44% higher than that of aluminum windows. Of course, these two types of plastic steel doors and windows have better thermal insulation performance than aluminum alloy doors and windows, but other performance plastic steel doors and windows are not as good as aluminum alloy doors and windows. The price of hollow double glass aluminum alloy doors and windows is about 25% higher than that of single glass plastic steel doors and windows. However, the thermal insulation, sound insulation and other properties of the former are better than those of the latter. For internal casement windows with similar structural forms, the price of the latter is about 24% higher than that of the former when the thermal insulation performance index (k=2.8) of aluminum alloy window insulation profile hollow glass reaches the level of plastic steel doors and windows hollow double glass windows (k=2.7); However, the former is far better than the latter in terms of high strength, high performance, excellent corrosion resistance (spray paint), decorative effect (various colors such as metallic texture and non-metallic texture, and the frame and window frame can be both indoor and outdoor colors), long service life and other comprehensive properties

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