[China Glass Net] Do you know the common problem of glass glue?
1. What is the reason for the neutral transparent plastic to turn yellow?
Neutral transparent adhesive yellowing is a defect in the glue itself, mainly caused by the cross-linking agent and tackifier in the neutral gel, because the two raw materials have an "amine group", and the amine group is extremely easy to cause Yellowing. In addition, if the neutral transparent adhesive is used together with the acid glass glue, it may cause the neutral glue to turn yellow after curing. It may also be caused by the long storage time of the glue or the reaction of the glue with the substrate.
Second, why does neutral porcelain white glue become pink? Some rubbers turn back to porcelain white one week after curing?
This phenomenon may occur with alcohol-based neutral gels, which are caused by the production of raw material titanium chromite. The titanium chrome compound itself is red, and the porcelain white color of the glue is the coloring effect of the titanium white powder in the glue. However, the glue is organic, and most of the organic chemical reactions are reversible reactions, as well as the production of side reactions. The temperature just happens to be the key to these reactions. The temperature is high and the positive reaction causes the color to change. However, after the temperature is lowered, the reaction is reversed and the original state is restored. The production technology and formula are well mastered and should be avoided.
3. Why do some transparent glass glues change into porcelain white color after five days? Neutral green glue becomes porcelain white after construction, why?
This should also be a problem in the selection and verification of raw materials for plastics. Because some domestic rubbers are added with plasticizers, they are easy to volatilize; while some rubbers have more reinforcing fillers. When the plasticizers volatilize, the rubber strips are stretched due to shrinkage, and the filler color is present (all fillers of neutral rubber) It is white in itself). Various color glues are added with pigment to make them into various colors. If there is a problem with the choice of pigments, the color of the glue will change after construction; or the color glue is too thin during construction, and the glue is inherently small in the curing process. Shrinkage will make the color of the glue lighter. In this case, it is recommended to maintain a certain thickness (3mm or more) when applying the glue.
4. Why is the glass glue on the back of the mirror? After a period of time, there are traces of spots or glue on the mirror surface?
There are usually three different backside coatings on the market: mercury, sterling silver and copper. The common mirror is smeared for a period of time after the speckle appears on the mirror. In this case, the user should use acid glass glue, and the acid glass glue usually reacts with the above materials to cause the speckle to be seen on the mirror surface. Therefore, we emphasize that neutral gel should be used, while neutral gel is divided into two types: alcohol type and ketone type. If the mirror of the copper bottom is made of ketone oxime type neutral glue, the ketone oxime will be slightly corroded to the copper material. After a period of construction, the mirror surface will see corrosion marks on the back sizing place. If it is changed to alcohol type neutral glue This phenomenon does not occur. All of the above are due to improper selection of substrates. Therefore, it is recommended that the user do a good compatibility test before using the glue to see if the glue is compatible with the material. Use the right glass glue to avoid unnecessary losses.
5. Some glass glues are salty-sized granules when they are shot out, and some granules will be automatically solved after curing. Why?
This is a problem in the formulation of raw materials for selecting glues. Because some of the cross-linking agents contained in the gel are crystallized in a low temperature environment, the cross-linking agent condenses in the gel bottle, and when it is shot, it will see a salt-like granular shape, but it slowly Will melt, so the granularity will be automatically solved after curing. This situation has little effect on the quality of the glue. This situation is mainly caused by the influence of low temperature.
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