Qingdao Glass Beads: Reasons and Control Measures for the Increase of Dew Point of Insulating Glass
As a new type of energy-saving building material, insulating glass is widely used with heat and sound insulation properties. At the same time, the quality requirements for insulating glass are getting higher and higher. It is understood that the biggest quality problem of insulating glass is condensation in the air layer during use, and the reason for the condensation in the air layer is that the dew point of the air layer increases during use. Therefore, controlling the dew point of insulating glass is the key to controlling the quality of insulating glass. Qingdao glass beads insulating glass in the use process, when the ambient temperature is reduced to the temperature of the glass surface to the dew point in the dry air layer, condensation or frost will occur on the surface of the dry air layer. The performance of insulating glass is affected by condensation or frost on the inner surface of the glass. If it is ensured that the air layer does not condense above minus 40 degrees Celsius, there will be no air layer condensation during the use of insulating glass. 1. Analysis of the reasons for the increase in dew point The dew point of insulating glass refers to the temperature when the humidity of the air sealed in the air layer reaches saturation. Below this temperature, the water vapor in the air layer will condense into liquid water. It can be concluded that the higher the water content, the higher the dew point temperature of the air. When the temperature of the inner surface of the glass is lower than the dew point of the air in the air layer, the moisture in the air will condense or frost on the inner surface of the glass. The increase in the dew point of insulating glass is caused by external moisture entering the air layer without being absorbed by the desiccant. There are three reasons that may cause the dew point to increase: (1) There are bubbles in the sealant, which causes air moisture to enter. (2) Water vapor diffuses through the polymer into the air layer. (3) The effective adsorption capacity of the desiccant is low. 2, hollow glass dew point control measures (1) Strictly control the production environment temperature The production environment mainly affects the attached capacity and the remaining adsorption capacity. (2) Reducing the diffusion of water through the polymer mainly depends on choosing a sealant with a low permeability coefficient, determining a reasonable sealing thickness, and reducing the temperature difference between the inside and outside of the insulating glass (that is, controlling the production within a certain temperature range without making the temperature range too large. ) (3) Reduce the production process time to minimize the contact time of the desiccant with the atmosphere, reduce the loss of adsorption capacity and make the desiccant have a higher adsorption capacity. (4) Choose the appropriate aluminum profile. The air conduction seam of the pores should be small to reduce the water absorption rate of the molecular sieve during operation. (5) Choose a suitable desiccant. Choose a desiccant with a high adsorption rate and a long-lasting. believes that the quality of insulating glass will be obviously controlled through the control of material selection, processing, environment and other links.