In the construction process of insulating glass sealant, if not carried out according to the correct construction technology, it will lead to air leakage and water leakage of insulating glass. Two-component glue machine manufacturers are also here for you to sort out the main manifestations of improper construction technology of sealant!
1. The cleanliness of the bonding surface of the base material is not enough. The low bonding strength, poor bonding performance and air tightness of sealant are caused by insufficient surface cleanliness of base material after curing.
2. Inappropriate proportion of sealant mixing or uneven mixing. The improper mixing ratio of component A and component B of the two-component sealant and insufficient mixing will lead to uneven curing and poor bonding performance of the produced sealant. In addition, if air bubbles are mixed in the mixing process, the breakage phenomenon will easily occur in the extrusion process, which will affect the bonding performance.
3、清洗打膠設備的溶劑沒有揮發干凈。打膠設備一般采用溶劑進行清洗, 清洗打膠設備的溶劑如果未揮發完全,打膠時附著在密封膠的表面, 就會在密封膠與基材粘結表面形成氣孔,導致密封膠與玻璃粘結不良。
3. The solvent used for cleaning and gluing equipment is not volatile and clean. Solvent is usually used to clean the gluing equipment. If the solvent of the gluing equipment is not volatilized completely, it will adhere to the surface of the sealant when gluing. It will form air holes on the surface of the sealant and the base material, which will lead to bad bonding between the sealant and the glass.
4、施工和養護條件不符合工藝要求。以硅酮密封膠為例, 施工溫度范圍一般在5℃~40℃(具體情況參照密封膠供應商的要求), 施工溫度過高或過低均會影響密封膠的性能。溫度過高時施工可能造成硅酮密封膠的固化反應速度過快,產生的小分子物質來不及遷移出膠體表面而在膠體內部聚集形成氣泡[圖5a)] ,從而破壞膠縫的美觀和性能;溫度過低,硅酮密封膠的固化速度會特別慢, 固化過程顯著延長。溫度低于4℃時, 基材的表面容易結露或結冰、結霜等, 為粘結安全性帶來很大隱患。做成中空玻璃后, 如果養護時間太短,密封膠還沒有完全固化就直接接觸陽光暴曬,則會出現密封膠外觀顏色變化或起泡現象。
4. Construction and maintenance conditions do not meet the technological requirements. Taking silicone sealant as an example, the construction temperature range is generally 5 ~40 C (referring to the requirements of sealant suppliers in specific situations), too high or too low construction temperature will affect the performance of sealant. When the temperature is too high, the curing reaction speed of silicone sealant may be too fast, and the small molecule substances generated can not migrate out of the colloid surface and form bubbles in the colloid [Fig. 5a], thus destroying the beauty and performance of the seam. When the temperature is too low, the curing speed of silicone sealant will be particularly slow and the curing process will be significantly prolonged. When the temperature is lower than 4 C, the surface of the substrate is easy to dew or freeze, frost and so on, which brings great hidden danger to the bonding safety. After making hollow glass, if the curing time is too short and the sealant is not fully cured, it will be exposed to the sun directly, then the appearance of the sealant will change color or foam.
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