The difference between the normal temperature sealing agent and the normal temperature sealing agent

[China Aluminum Industry Network] Before the rise of medium-temperature sealing technology, sealing at room temperature has been widely applied, mainly because of its low energy consumption, and its process control method is also very mature. With the promotion and application of solar energy frames, medium-temperature sealing has begun to replace large-area sealing at room temperature. Compared with room temperature sealing, the medium-temperature sealing time is short, there is no fluorine, the surface is not blue after sealing, and the inner cavity is also a metallic color. , in line with the high standards of solar frame requirements.

However, after many years of application, although the advantage of medium-temperature sealing is obvious, the problems exposed are also numerous and have not been well solved for a long time, such as poor weight loss in winter, frequent occurrence of viscose problems, and sealing of white ash. The two-component makes the process control difficult, high energy consumption, the bath liquid generally needs to be filtered, the bath liquid anti-pollution ability, especially the introduction of the coloring bath liquid makes the bath liquid aging faster. However, conventional sealing at normal temperature also has its disadvantages, such as blueing of the surface after sealing and blackening of the cavity, which are not in line with the requirements of the solar energy frame. The longer sealing time than the medium temperature also restricts the production efficiency.

The difference between the normal temperature sealing agent and the common temperature sealing agent is the color of the aluminum surface and interior cavity after the sealing. True color temperature is based on the general temperature of the following improvements:

First, to achieve the true appearance of the hole after sealing: the data show that the addition of cobalt salt has a certain effect, but its problem is that the cost is too high; Secondly, through continuous experiments show that the consumption of cobalt is difficult to control, easy to cause the appearance after sealing Abnormal color changes, sometimes white and sometimes green, it is difficult to maintain a stable color.

Second, to achieve the cavity is not black: the sealing agent containing fluorine at room temperature after sealing the cavity will be black, so we must avoid the emergence of this phenomenon. Adding oxidizing substances can achieve effects. Experiments show that conventional oxidizing substances such as nitrates, although added in small amounts, can easily affect the sealing effect (especially weight loss), and due to their low content, consumption and Bringing out makes it impossible to achieve continuous production at all and it is very difficult to control.

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