门窗中空玻璃上结水珠的原因及措施。

2015-09-24

门窗中空玻璃是门窗的重要组成部分,对于不管是塑钢门窗还是断桥铝门窗的密封保温隔热隔音的影响起着很重要的作用,门窗中空玻璃最早发源于美国,中空玻璃作为新型的节能建筑材料,隔热和隔音性能而被广泛应用。同时
门窗中空玻璃是门窗的重要组成部分,对于不管是塑钢门窗还是断桥铝门窗的密封保温隔热隔音的影响起着很重要的作用,门窗中空玻璃最早发源于美国,中空玻璃作为新型的节能建筑材料,隔热和隔音性能而被广泛应用。同时对门窗中空玻璃的质量要求越来越高。据了解,中空玻璃最大的质量问题就是在使用中空气层结露,而空气层结露的原因就是空气层的露点在使用过程中升高了。因此控制中空玻璃的露点是控制中空玻璃质量的关键。
门窗中空玻璃在使用过程中,当环境温度降低到使玻璃表面温度降低至干燥空气层内的露点时,干燥空气层的表面会产生结露或结霜。由于玻璃内表面的结露或结霜而影响中空玻璃性能。如果保证空气层在零下40摄氏度以上不结露,中空玻璃在使用过程中是不出现空气层结露现象的。
1、 露点上升的原因分析
中空玻璃的露点是指密封于空气层中的空气湿度达到饱和状态时的温度。低于该温度,空气层中的水蒸汽就会凝结成液态水。可推出:水的含量越高,空气的露点温度也就越高,当玻璃内表面温度低于空气层内空气的露点时,空气中的水分就会在玻璃内表面结露或结霜。
中空玻璃的露点上升是由外界的水分进入空气层而不被干燥剂吸收而造成的,有三种原因可能会导致露点上升:
(1)密封胶内存有气泡,导致空气水分进入。
(2)水气通过聚合物扩散进入空气层中。
(3)干燥剂的有效吸附能力低。
2、 中空玻璃露点控制措施
(1)严格控制生产环境温度
生产环境主要影响附能力及剩余吸附能力。
(2)减少水分通过聚合物的扩散
主要靠选择低渗透系数的密封胶,确定合理的密封厚度,减少中空玻璃的内外温度差(即控制在一定温度范围内生产而不能使温度范围过大。)
(3)缩减生产工艺时间
尽量减少干燥剂与大气接触的时间,减少吸附能力的损失而使干燥剂有较高的吸附能力。
(4)选择合适的干燥剂
要选择吸附率较高且持久的干燥剂。
相信通过选料、加工、环境等各个环节的控制,中空玻璃的质量会得到明显的控制。
门窗中空玻璃都是由门窗厂指定的中空玻璃生产加工的或者由门窗厂自己的玻璃车间生产的,严格按照门窗中空玻璃的生产工艺加工制作而成,成为塑钢门窗断桥铝门窗的配套产品。

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