Table 2 Insulating Glass Sealant Gas Permeability Item Number of Water Vapor Transmission (3mm Piece) Argon Gas Permeability / (%/a) Test Unit) Argon Gas Permeability (2. Double Sealing Process, The first uses butyl (or polyisobutylene) as the binder, and the second uses polysulfide, silicone, and polyurethane as the binder. The double-pass sealing process utilizes butyl (or polyisobutylene). The advantage of the lowest air permeability of the sealant and the characteristics of the fast fixing glass and the spacer frame (because of its physical bonding with the glass spacer, not chemical bonding), the use of polysulfide (silicon germanium, etc.) curing type The excellent structural strength of the sealant, the advantages of good weather resistance, adhesion and the ability to control the curing speed. The double-pass sealing process is the respective advantages and characteristics of the curing type and hot-melt type sealing agent. It is organically combined and used in the production of insulating glass to find the best processing method so far.
In recent years, the hollow glass produced by the strip method has emerged on the market, which consists of a wave-shaped aluminum strip plus a layer of sealant (this should also be a single-pass sealing process) because the main material of the strip is butyl (or Polybutylene) hot-melt type sealant, although it is only characterized by good air tightness and rapid solidification, it forms a non-chemically bonded surface with glass under heating and pressure conditions. The bonding performance is poor, and the structural strength is low. It is greatly affected by temperature during use, and there is a problem that it is easy to creep when exposed to heat, hard to be hardened at low temperature, and poor in resistance to displacement and deformation. In recent years, this kind of product has been developed in China, but due to the lack of in-depth discussion and research on application technology, it still needs to be tested by practice.
In summary, we believe that: C) should promote the double-pass sealing process; () the application of single-pass sealing process products has certain limitations.
3 Conclusion In view of China's vast territory, large climate differences, and the actual situation of different levels of economic development in each region, it should be based on regional and climatic differences, comprehensive consideration of the applicable environment, conditions, engineering structure, specifications and other factors, correctly Different types of insulating glass are used.
Contact address: New gas pipeline production line No. 91, West Section of Hebei Street, Qinhuangdao City, Hebei Province Successfully developed Qingdao Deyili Group Co., Ltd. introduced and absorbed foreign advanced production technology and developed the first new MDPE/HDPE gas pipeline production line in China. After testing, all technical indicators have met the relevant national standards. Experts believe that the production line has filled the domestic gap and can completely replace imported products. The gas pipe produced is suitable for long-distance buried gas pipelines.
Deyili Group is the completion unit of the aluminum-plastic composite pipe production line of the key scientific research achievements promotion project of the Ministry of Construction. It is mainly engaged in the research and development and production of new plastic building materials equipment and new chemical building materials. In the face of fierce market competition, in order to seize the great opportunity of the country's western development and "West-to-East Gas Transmission", after painstaking research, we finally developed the first new MDPE/HDPE gas pipeline production line in China.
It is understood that in some economically developed countries, the proportion of plastic pipes in gas pipelines has reached more than 90%, mainly using MDPE or HDPE pipes. In recent years, the amount of natural gas pipelines inter-city pipelines in China has increased rapidly year by year, but the consumption of plastic pipes is only 20%, and the market development potential is huge. The production line has a unique structure, high degree of automation, convenient operation, and stable and reliable continuous production. The production line adopts strong conveying bushing and high-efficiency screw, center feeding, spiral split-type squeeze tube composite head; vacuum negative pressure setting and circulating water spray cooling; optional electrical components, main engine DC converter and inverter In order to import famous brand products, high, vertical and horizontal adjustments have been realized to ensure the requirements for pipe production. In addition, the production line also has a multi-purpose function, the production line is slightly modified and equipped with different molds, and can also produce PPR, PE, PP, ABS pipes with color marking lines and plastic composite pipes of two different materials. Tested by the authority of the chemical building materials testing center, the MDPE/HDPE plastic gas pipe produced by this equipment has the characteristics of heat resistance, aging resistance, high mechanical strength, environmental stress crack resistance and good creep resistance. It is used in construction projects such as the development of the western region, the “West-East Gas Transmission†and the inter-city gas pipeline laying.
It is understood that this new type of gas pipe can reduce the cost by about 12% compared with the steel pipe currently widely used in China. The service life can reach 50 years and the maintenance cost is low, which has broad market prospects. (Zhang Xuezhuan) new building materials 1/001
A chain link Fence is a type of fence made up of interlocking metal wires that form a diamond-shaped pattern. It is commonly used for various purposes, such as securing residential or commercial properties, creating boundaries for sports fields, or enclosing outdoor spaces.
The main components of a chain link fence include the metal posts, top rail, tension wire, and the chain link fabric itself. The posts are typically made of steel and are installed at regular intervals along the fence line. The top rail runs horizontally along the top of the fence, providing additional stability and support.
The chain link fabric consists of woven metal wires that form the diamond-shaped pattern. It is available in different heights and gauges, with smaller gauges being thicker and more durable. The fabric is attached to the posts and top rail using tension bands, which are secured with bolts or screws.
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Chain link fences are popular due to their affordability, durability, and low maintenance requirements. They provide a secure barrier while still allowing visibility and airflow. Additionally, they can be easily customized with various colors and coatings to match the surrounding environment.
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