[China Glass Network] Some common questions about glass glue, give you a detailed answer today!
1. What is the reason for neutral yellow plastic yellowing?
A: Neutral transparent plastic yellowing is a defect in the glue itself, mainly caused by the cross-linking agent and tackifier in the neutral rubber. The reason is that the two raw materials have an "amine group" and the amine group is extremely It is easy to cause yellowing, and many imported brands of glass glue are also 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, or it may be caused by the long storage time of the glue or the reaction between the glue and the substrate.
2. Why does neutral porcelain white glue turn pink? Some rubbers turn back to porcelain white one week after curing?
A: Alcohol-type neutral gel may have this phenomenon, which is caused by the production of titanium oxide.
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. Some domestic transparent plastics, changed to porcelain white color after five days? Neutral green glue becomes porcelain white after construction, why?
A: This should also be a problem in the selection and verification of raw materials. Because some domestic rubbers are added with plasticizers, they are easy to volatilize, and 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 glue) It is white in itself).
Various color glues are added with pigments 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. The small amount of shrinkage inherent in the curing process makes 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 while, there are traces of spots or glue on the mirror surface?
A: 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. The acid glass glue usually reacts with the above materials, causing the speckle to see the speckle. 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 compatibility test before using the glue to see if the glue is compatible with the material.
5. Some glass glues are salty-sized granules when they are shot out, and some granules will be automatically solved after curing. Why?
A: This is a question on the choice of raw materials for the glue. 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.
6. Some domestic glues are hit on the glass, and there is still no glue for 7 days. What is the reason?
A: Most of this situation occurs when it is cold.
First, the glue is too thick, and the dry glue is slow.
Second, the construction environment is affected and the weather is bad.
Third, the glue expires or has problems.
Fourth, the rubber is soft and it feels dry.
7. What is the reason for the bubble sound of some domestic glass glues when sizing?
A: There are three possible reasons:
1. When the dispensing is done, the technology is not closed, and the air is mixed into the plastic bottle;
Second, a small number of black-hearted manufacturers deliberately do not press the bottom cover of the bottle, leaving the air in the bottle to give people a feeling of sufficient amount of glue;
Third, some domestic glues are not 100% silicone glue, and the added filler will have a slight chemical reaction with the PE soft rubber of the glass glue bottle, which will cause the rubber bottle to expand and increase, and the air remaining in the space will appear. The glue is infiltrated to create a void, and a bubble is generated when the glue is applied. An effective way to overcome this phenomenon is to switch to a hard bottle and pay attention to the product storage environment (lower shades below 30 °C).
8. Why do some neutral glues in summer have many bubbles after curing at the joint of concrete and metal window frames, and some will not? Is it a quality issue? Why hasn't there been a similar phenomenon before?
A: Many brands of neutral rubber have had similar phenomena, but it is not the quality of glue. The neutral gel has two types of alcohol type and ketone oxime type, and the methanol contained in the alcohol type gel will release gas during the curing process (methanol starts to volatilize at about 50 ° C), especially in the case of direct sunlight or high temperature reaction.
In addition, concrete and metal window frames are difficult to breathe. In addition, the summer temperature and humidity are higher and the curing is faster. The gas released by the glue can only be run out of the fully cured rubber layer, and the cured rubber strip will appear. Bubbles of different sizes. The ketone oxime type neutral glue does not release gas during the curing process, and no bubbles are generated.
However, the shortcoming of ketone oxime type neutral glue is that once the technology and formula are not handled well, there is a chance of shrinkage cracking when it is cold during the curing process in winter.
No similar phenomenon has occurred in the past because in the past, construction units used very little silicone rubber in this place. Generally, propylene-based waterproof sealing materials were used. Therefore, the phenomenon of silicone neutral rubber foaming is not very common. In recent years, silicone sealants have been widely used, which has greatly improved the quality of engineering. However, due to the lack of understanding of the material properties, the sealing of the sealant is caused by improper material selection.
9. How to do compatibility testing?
A: In a strict sense, the compatibility test between the adhesive and the building substrate should be carried out in the nationally recognized building materials testing department, but the period of inspection results in these departments is long and the cost is high.
In order to have such necessary engineering, it is necessary to determine the use of a building material product by a qualified inspection report of the national authoritative testing organization, and the general engineering can provide the substrate to the manufacturer of the glass glue for compatibility testing. The structural adhesive is 45 days, and the test results can be obtained in about 35 days for neutral glue and acid glue.
The simpler and quicker method is that the user can test the glass glue on a small amount of substrate. After fully curing, observe the surface effect and try to test the peel strength of the glass glue to easily determine whether the viscose and tension of the glass glue product are Meet the needs of use.
10. Why is acid glue used on cement to fall off easily?
Answer: Acidic acid produces acetic acid during curing, which reacts with the surface of alkaline materials such as cement, marble, granite, etc. to form a chalky substance, which causes it to fall off.
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