[China Glass Net] Several common problems in the construction process of silicone structural adhesive: 1. poor bonding; 2. slow curing; 3. insufficient bonding width of structural adhesive; 4. bubbles and holes in structural colloid; The structural glue is unevenly mixed. Today we continue to explain in detail how to avoid the abnormality of the mixing ratio (over-component A or excessive B-component) during the construction of the (two-component) silicone structural adhesive. Fancy Trousers Fabric,Fancy Design Fabric,Yarn Nylon Jacquard Knit Fabric,Fancy Jersey Fabric Shaoxing Sinofashion Textiles Co.,Ltd. , https://www.shownaturetex.com
Different manufacturers' products have different characteristics, and each manufacturer will give a better range of mixing ratios of their own products. Mixing in this ratio range can obtain better product performance. If it exceeds the manufacturer's recommended mixing ratio range, it will lead to a series of problems, such as slow curing, weaker strength, poor elasticity, poor adhesion, etc. Will seriously affect the safety of the curtain wall!
In order to ensure that the sealant products are mixed within the ratio range recommended by the manufacturer, the pull-off time test should be carried out every day when the glue machine is turned on, and it is confirmed with the range of the pull-off time given by the manufacturer. For example, Baiyun brand two-component structural adhesive at a temperature of 23-25 ​​° C, relative humidity of 40-60%, A and B components in the normal volume ratio of 9:1-11:1, pull-off time For 20-60 minutes. Under the above environmental conditions, if the breaking time exceeds this range, the mixing ratio is considered abnormal.
The breaking time will be affected by the ambient temperature and humidity. Under actual temperature and humidity conditions, there will be some deviations from the time recommended by the manufacturer. For example, when the temperature is low, the breaking time will be prolonged. However, this pull-off time should generally be stable, and the results of the test within a few days should not be subject to large fluctuations. If the temperature or humidity does not change drastically and the pull-off time fluctuates significantly, you need to find out the cause, check whether the equipment is normal, whether the product is normal, etc., and then continue the construction after removing the problem.
An abnormality in the mixing ratio may be a device setting problem or a device failure. When switching to different brand structural adhesives, you need to pay attention to the mixing ratio of the glue machine. The recommended mixing ratio of two-component silicone structural adhesives from different manufacturers may be different. For example, the recommended volume ratio of Baiyun brand two-component silicone structural adhesive is 9:1~11:1, while the recommended volume of another manufacturer's product. The ratio is 7.6:1~10.6:1.
If the mixing ratio of the device is set properly and the appropriate pull-off time in the corresponding environment is still not available, the device should be inspected.
The abnormal mixing ratio of the structural adhesive will affect the curing of the structural adhesive and the strength and cohesiveness after curing, which seriously affects the safety of the curtain wall. I hope that everyone will pay attention to the test of the breaking time during the process of using the glue to ensure that the mixing ratio of the glue machine is normal. Use structural glue!