Hollow Glass Molecular Sieve - 3A Molecular Sieve

1. What is a special molecular sieve for hollow glass:
    The molecular sieves that meet all the performance specifications of insulating glass and do not have any influence on their physical and chemical properties are eligible for the special molecular sieve for insulating glass. Only 3A molecular sieves are required to meet this requirement.
2. Why only 3A molecular sieves are qualified for use in insulating glass:
    (1) The 3A molecular sieve only adsorbs water and does not adsorb oxygen and nitrogen in the air.
    (2) The 3A molecular sieve is weakly alkaline and has a pH of 10.5, which will not damage the aluminum strip in the insulating glass.
    (3) The 3A molecular sieve has a fast water absorption rate and a water absorption rate of 0.04 g/s.
    (4) The 3A molecular sieve has a large amount of water absorption, and the water absorption amount is ≥ 20%.
    (5) 3A molecular sieve does not produce hydrolyzed at room temperature.
3, why 4A molecular sieve can not be applied to insulating glass:
    In addition to adsorbing oxygen and nitrogen in addition to the moisture in the air, the 4A molecular sieve will cause the hollow glass to undergo changes in ambient temperature and pressure, convex or concave (when the ambient temperature rises, the 4A molecular sieve will release the adsorbed nitrogen and oxygen. The internal pressure of the insulating glass is stronger than the outside pressure, and the hollow glass will be convex. When the outside temperature decreases, the 4A molecular sieve adsorbs nitrogen and oxygen so that the external pressure is stronger than the internal pressure of the insulating glass, and the hollow glass convexity disappears or is concave. Such a convex-concave will have an impact on the sealing performance of the insulating glass, and more severely will cause the hollow glass to break.
4. Why the common desiccant (desiccant with attapulgite as raw material) cannot be used in insulating glass:
    (1) The desiccant adsorbs oxygen, nitrogen, and carbon dioxide in addition to the moisture in the air. (When the outside temperature rises, the desiccant will release the adsorbed nitrogen and oxygen to cause the internal pressure of the insulating glass to be stronger than the external pressure, and the insulating glass will Convex. When the outside temperature decreases, the desiccant adsorbs nitrogen and oxygen to make the external pressure stronger than the internal pressure of the hollow glass, and the hollow glass convexity disappears or concaves) which will affect the life of the hollow glass.
    (2) The desiccant has a low adsorption amount at a relatively low temperature or a high temperature, which affects the dew point of the insulating glass.
    (3) The adsorption rate is slow, and the adsorption of water depends on the affinity. At room temperature or when the temperature is high (≥40°C), hydrolysis will occur, which will affect the transparency of the insulating glass.
5. Why the molecular sieve does not produce hydrolysis at room temperature:
    Adsorption of water by molecular sieves is adsorbed by van der Waals forces. From the microscopic point of view, the interior of the molecular sieve pores reaches the electrostatic equilibrium. Water molecules are polar molecules and decompose into hydrogen ions and hydroxide ions. In the adsorption process of water, the molecular sieve reacts with the hydrogen ions and hydroxide ions after the decomposition of the water molecules to reach the electrostatic equilibrium again, breaking the oxygen and hydrogen bonds to release the energy (temperature rise phenomenon). The whole process is a physical reaction. Therefore, the molecular sieve does not generate hydrolytic absorption at normal temperature.