[China Aluminum Network] 1. What is the reason for the yellowing of neutral transparent glue?
A: The yellowing of the neutral transparent glue is a defect in the glue itself, which is mainly caused by the cross-linking agent and the tackifier in the neutral glue. The reason is that these two kinds of raw materials bear the “amine†and the amine group is the pole. Easy to cause yellowing, many imported brands of glass glue is therefore the phenomenon of yellowing. In addition, if the neutral transparent glue is used together with the acid glass glue, it may cause yellowing after the neutral glue is solidified; it may also be caused by a long storage time of the glue or a reaction between the glue and the substrate.
2. Why does the neutral porcelain white glue turn pink? Some glues 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 raw materials titanium-chromium complex. The titanium-chromium complex itself is red, and the porcelain white color of the gum is the tinting effect of the titanium dioxide in the gum. However, gum is an organic matter, and the vast majority of organic chemical reactions are reversible reactions, as well as the occurrence of side reactions. The temperature is just the key to cause these reactions. When the temperature is high, a positive reaction occurs to change the color, but after the temperature is stabilized, the reaction proceeds in reverse and restores its original appearance. Good mastery of production techniques and formulations should avoid this phenomenon.
3, some domestic transparent plastic, play out after five days of porcelain white color? Neutral green plastic after construction change white porcelain color, why?
A: This should also be a problem of the quality of the glue, which is a matter of raw material selection and verification. Because some domestic plastics have plasticizers added to them, they are volatile; while some plastics contain more reinforcing fillers. When plasticizers volatilize, the strips are stretched due to shrinkage. The filler color (neutral plastic all fillers) Itself is white). Various colored glues are added with pigments to make them into various shades. If there is a problem with the choice of pigments, the color of the glue will change after construction; or the color glue will be too thin during construction, and the glue will be inherently small during the curing process. Shrinkage makes the color of the glue lighter. This condition is recommended to maintain a certain thickness (3mm or more) when sizing.
4. Why is the back of the mirror marked with glass glue? After a while, the mirror surface shows signs of spotting or glue.
A: There are usually three different backside coatings on the mirror in the market: mercury, sterling silver and copper. After a certain period of time, the common mirror squeegee has a speckle on the mirror. This situation should be that the user used an acidic glass adhesive, and the acidic glass adhesive usually reacts with the above-mentioned materials, causing the mirror to see spotting. Therefore, we emphasize that neutral gels should be used, while neutral gels are classified into two types: alcohol type and ketone oxime type. If the mirror at the bottom of the copper is ketoxime neutral gel, the ketoxime will have slight corrosion to the copper material. After a period of construction, the mirror will show signs of corrosion at the back sizing. If alcohol type neutral gel is used, This will not happen. The above are due to improper selection of materials due to the diversity of substrates. Therefore, it is recommended that before the user uses the glue, it is better to make a compatibility test to see if the glue is compatible with the material. Appropriate glass adhesive products can be used to avoid unnecessary losses.
5. Some glass gels have a grain size that is the size of salt grains. After solidification, some graininess will be solved automatically. Why?
A: This is a problem with the formulation of the raw materials used to select the glue. Because some cross-linking agents contained in the gel have a crystallization phenomenon in a low-temperature environment, the cross-linking agent condenses in the glue bottle, and after it is punched out, it will be seen as a granular grain size, but it slowly Will dissolve, so the granularity will be solved automatically after curing. This situation has little effect on the quality of the glue. This happens mainly because of the relatively large temperature.
6, some domestic rubber hit the glass, 7 days is still not dry glue, what reason?
A: Most of these situations occur when it is cold. First, the glue is too thick and the glue is slow. Second, the impact of the construction environment, bad weather. Third, the glue expired or have problems. Fourth, the rubber is soft and feels dry.
7. What are the reasons for the bubble sounds of some domestic glass glues in sizing?
A: There may be three reasons: First, the technology does not pass when dispensing, plastic bottles mixed with air; Second, a small number of black heart manufacturers deliberately do not press the bottom of the bottle, leaving the air in the bottle but give people a sufficient amount of plastic loading Feeling; Third, some domestic glue is not 100% silicone rubber, which increases the filling material will be slightly chemical reaction with the glass glue bottles of PE soft rubber, so that the rubber bottle has a phenomenon of swelling increased, the space remained The air penetrates into the glue to create voids, and bubble sounds when sizing. An effective way to overcome this phenomenon is to replace the rigid bottle packaging, pay attention to the product storage environment (shade below 30 °C).
8. Why is there some bubbles in the summer when some of the neutral rubber is cured in the joint of the concrete and metal window frames, and some will not? Is it a question of quality? Why didn't similar phenomena occur before?
A: Many brands of neutral rubber have had similar phenomena. After careful inspection and repeated experiments, it is not the quality of the glue. Because the neutral gel has two kinds of alcohol type and ketone oxime type, and the methanol contained in the alcohol type gel will release gas (methanol starts to volatilize at about 50°C), especially in direct sunlight or high temperature reaction. . In addition, concrete and metal window frames are very difficult to breathe. In addition, the higher the temperature and humidity in the summer, the faster the curing will be. The gas released from the glue will only run out of the completely cured adhesive layer. Bubbles of different sizes will appear. The ketoxime neutral gel will not release gas during curing and will not generate bubbles. However, the disadvantage of ketoxime neutral gel is that once the technology and formulation are not handled properly, there will be opportunities for shrinkage and cracking in the cold during the curing process in winter, and the technology is good, and there is no such phenomenon when the formulation passes through. Of course, ketoxime neutral gels are slightly more expensive than alcohols.
No similar phenomenon occurred in the past because in the past, construction and construction units used very few silicone glues in such places, and generally used a waterproof sealing material of acrylics, so the phenomenon of blistering of silicone neutral gel was not very common; Gradually, silicone sealants have been widely used, which has greatly improved the quality of the project, but due to the lack of understanding of the characteristics of the materials, the phenomenon of blistering of the sealant caused by improper material selection.
To solve such problems, the following points should be noted: First, a more prudent approach is to first do a partial use test to observe whether it meets the needs of the use (usually two or three days after the sizing can see the reaction); Second, distinguish the use of time And the type of substrate, choose the right neutral gel to use: Ketone germanium type in summer, alcohol type in winter; Third, keep the construction surface clean and dry; Fourth, avoid high temperature period (35 °C above) in summer sizing and Direct sun is usually suitable in the evening; V. Similar projects can be traced by factory technicians.
9, how to do compatibility test?
A: Strictly speaking, the test of compatibility between adhesives and building substrates should be conducted at the state-recognized building material testing department. However, due to well-known reasons, the cycle of obtaining results in these departments is longer. costly. It is of course necessary to have such a necessary engineering level inspection report of the national authority testing agency to determine whether to use a building material product, and a general project can provide the substrate to the glass glue manufacturer for compatibility testing. Structural adhesives are available for 45 days. Neutral and acidic gels can be tested in about 35 days. The simpler and quicker method is that the user himself can try the glass glue on a small amount of substrate, observe the surface effect after completely curing, and test how the peel strength is by hand, so as to simply determine whether the glass glue product has adhesive force, pulling force, etc. Meet the needs of use.
10. Why is it easy for acid gel to fall off on cement?
A: This is actually a more basic issue in the application of glass glue. Acrylic acid produces acetic acid when it cures, reacts with the surface of alkaline materials such as cement, marble, and granite to form a chalky substance that causes shedding.
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