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Application of molecular sieves in insulating glass

Choosing the right type of molecular sieve has a negligible effect on the quality and service life of the insulating glass.

The sealed insulating glass was invented in 1865, and the insulating glass originally invented was simply free of adsorbent and organic sealant. However, with the worldwide energy shortage and the development of modern organic sealants and adsorbents, the demand for insulating glass has made great progress. Due to its excellent thermal insulation, sound insulation and bright, beautiful appearance, the insulating glass is also used more and more widely. China has been developing hollow glass since 1964. Since the development of manual operation, it has made great progress in quality and output. Especially in recent years, insulating glass is facing an unprecedented development opportunity.

Molecular sieves are ideal adsorbents for insulating glass. Molecular sieves are a porous structure with a very large internal surface area. It has an affinity for both water and solvent. Based on decades of experience in the manufacture of insulating glass, it has been shown that the sealant interacts with the adsorbent and affects each other's performance. Through continuous research and development, UOP finely adjusts each product in the MOLSIV series of hollow glass-specific molecular sieves to provide the precise performance required for each sealant system.

Molecular sieves play a very important role in insulating glass. Used to prevent condensation on the inside surface of the insulating glass, frosting, solvent volatilization in the sealant, deflection under severe climatic conditions, hydrocarbons in the air such as paints, detergents and other solvents. Because water vapor in the air is sealed in the insulating glass during manufacture and use. Condensation occurs when the ambient temperature drops below the dew point of the gas in the hollow glass. Condensed water forms on the inside of the cold side of the insulating glass.

How much adsorbent is needed in the insulating glass? It can be answered in three ways: experience, water balance or required equivalent. Experience has shown that most manufacturers use two long sides or one long side and one short side to load the adsorbent. In many cases, this is enough. Water balance is a scientific method with sufficient adsorbent to remove water that penetrates during the manufacturing process and the life of the insulating glass. Only a small portion of the adsorbent is used for initial drying. "Relative Humidity" causes water to seep inside the insulating glass. This driving force is generated when the outside humidity is higher than the humidity inside the insulating glass. Removal of water from the life of the insulating glass can be calculated by water balance. This calculation requires knowledge of the rate of water penetration, the design life of the insulating glass and the highest dew point required for the life of the insulating glass. The required equivalent weight refers to the minimum dry dose required per inch when testing the insulating glass. In the United States, insulating glass manufacturers have developed the required equivalents, and many countries are also considering them.