Aluminum alloy door and window seal
In the past, plastic doors and windows were affected by the low-performance and poor quality sealing materials, and their quality and service life were greatly affected. Many quality problems occurred, which seriously damaged the reputation of the merchants. Especially used in the doors and windows of construction projects, it is hard and brittle, loses its elasticity and sealing function, and it is sticky and "leakage". When it loses its function, it pollutes the doors and windows and affects the appearance of doors and windows.
This phenomenon is attributed to the fact that enterprises have neglected the introduction and development of door and window accessories while improving the grade and performance of plastic doors and windows, resulting in the development of sealing materials lags far behind the development of plastic doors and windows. It is gratifying to note that high-quality door and window accessories, especially door and window sealing materials, are being accepted by everyone and gradually enter the door and window market.
Material condition of plastic door and window sealing strip
At present, the sealant strip materials used in foreign countries mainly include nitrile rubber, EPDM, thermoplastic elastomer (TPE), polyurethane elastomer (P), silicone rubber, etc., and have excellent aging resistance. The use rate of EPDM rubber is higher, reaching more than 60%.
Analysis on the development status of plastic door and window sealing materials in China
In recent years, in the market of domestic door and window sealing materials, the market share of plasticized polyvinyl chloride sealing strips has reached more than 90%, and the modified high-polymerization degree polyvinyl chloride and thermoplastic elastomer sealing strip market recommended by the relevant departments of the industry. The occupancy rate is extremely low, and most of them are concentrated in the surrounding areas of Beijing.
EPDM rubber was developed by Beijing Institute of Chemical Industry in the 1960s, but its application and development on doors and windows was only put on the agenda in the mid-1990s, and in 2000 by the Capital Aerospace Machinery Company rubber plastics. The product factory was developed and developed. In the latter part of the same year, it passed the acceptance of relevant experts from the Ministry of Construction. It is currently in the stage of mass production, but it is only used by some domestic high-end door and window manufacturers.
Compared with similar foreign products, the domestic EPDM rubber sealing strips are about 40% lower than the similar products in foreign countries, but they are still developing slowly. The reason is that the users have not realized that the sealing rubber strips account for a small proportion of the total cost of manufacturing the doors and windows. Only considering cost savings, did not consider the comprehensive benefits of using high-quality high-quality sealing materials.
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