[China Glass Net] There are four 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 voids in structural colloid. Today we will continue to detail how to avoid uneven mixing of two-component silicone structural adhesives.
The two-component silicone structural adhesive is composed of the main component A component (white glue) and the curing agent B component (black glue), and is uniformly mixed and used according to the ratio recommended by the manufacturer through a two-component rubberizing machine. The mixed structural adhesive is cured after a period of time to obtain better bonding properties and physical properties. However, if the structural adhesive is used in an uneven manner, the structural adhesive will be cured and quality problems will occur.
The structural glue is not evenly mixed. How to judge? The structural glue is not evenly mixed, and white streaks appear locally. It is easier to observe when the light is brighter. Mixed unevenness and uniform mixing, as shown below:
If the structural adhesive is not evenly mixed, what problems will occur? The strength of the structural adhesive is reduced after curing, the curing cross-linking is incomplete, and when it is severe, it will become sticky and cannot be cured.
What are the reasons for the uneven mixing of structural adhesives? How to solve them? There are four reasons for the mixing of structural adhesives and the following reasons: 1 Continuous gel: generally the mixer is blocked, the mixer is assembled incorrectly or the mixing unit used is not enough. ;
2 intermittent regular flower glue: related to system failure, such as proportioning pump seal leakage or proportional frame wear;
3 intermittent irregular rubber: related to the fault, such as filter blockage / needle valve blockage / platen failure / proportioning pump inlet blockage or seal failure / safety valve and high pressure ball valve failure;
4 When the gun is fired after a short pause, there is a piece of rubber at the beginning: mainly the viscosity of the glue is not ideal, and the system piping needs to be adjusted or the working pressure is reduced.
The above four cases of occurrence of rubber are solved by eliminating the malfunction of the glue machine.
How to avoid uneven mixing of structural glue?
The glue machine should be regularly maintained to ensure that the glue machine can work normally. A butterfly test must be done before each start-up to ensure that the structural glue is evenly mixed. The butterfly test method is as follows: squeeze the mixed glue from the glue machine to 5-10 grams in the middle of the paper, and fold the paper to flatten the glue. Open the paper to check the rubber sample. The evenly mixed glue should have no colored stripes. If the glue has different colored stripes, it indicates that the rubber is uneven. You should find the cause and solve the problem before using it.
The problem of uneven mixing of structural adhesives is very related to the glue machine, which will seriously affect the curing of the structural adhesive and the strength after curing, and the safety application of structural adhesives. It is hoped that the customer will ensure that the glue of the glue machine is normal and use the structural glue during the process of using the glue.
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