This is Auman environmental protection Xiaobian organized about the problems that may be encountered in the use and sale process of glass glue, to give you a reference for the owners of glass glue business,

1. Causes and prevention methods of foaming in the gum seam of Nehou glue

For an enterprise user to use my company's production of weather-resistant glue, glue joints appear more serious foaming phenomenon, through our company's technology.. The following causes of blistering were analyzed:

First, the influence of various operations during construction may cause foaming

1. Glue joints and substrate humidity is large, there is rain;

2. Accidentally cut the foam rod during construction;

3. If the foam rod is not selected correctly, the foam should not be low-density closed mouth foam rod which must comply with relevant specifications;

4. The thickness of sizing is not enough or too thin;

All of these factors can be avoided. During construction, it is necessary to ensure that the glue joint and substrate are dry and clean. Pay attention to the fact that the foam rod cannot be scratched during operation.

Two, the temperature difference is too large to cause foam. First of all, in summer, the daytime temperature is very high, the humidity is very high, if in the morning or afternoon construction is particularly easy to foam, because the silicone weather resistant glue is cured by absorbing water in the air under a certain temperature. When sizing is done in the morning or afternoon, the curing speed of silicone gel is very fast. During the curing process of silicone gel, chemicals will be released to form gas, which will gather together and cannot escape the gel immediately. This will cause foaming phenomenon. Generally, this situation occurs in the positive side of the curtain wall and the long side of the curtain wall component size. When the sun goes down in the evening, the sizing can avoid this phenomenon.

Because the temperature difference between day and night in winter is too large, the temperature is low, the climate is drier may cause this phenomenon. Colloid curing in winter takes a long time. When colloid is fully cured after construction, each unit component of curtain wall itself has a certain displacement. In addition, when the temperature difference between day and night is too large, the displacement resistance of colloid is poor when it is not completely vulcanized, so as to form the phenomenon of weatherproof glue seam drum.

The above phenomenon only affects the appearance of part of the curtain wall glue joint, but does not produce any adverse results on the performance index of the colloid. The phenomenon will be changed with the decrease of temperature difference.

Because silicone weather resistant adhesive has excellent weather resistance and strong high and low temperature resistance, it is recommended to construct under the following conditions:

1. Please avoid rainy weather construction, pay attention to the weather conditions during this period of sizing, good no rainy day.

2. When sizing, it is necessary to make the glue seam and the substrate in contact with the glue is dry.

3. In winter, from 11am to 3pm, and in summer, in the morning or evening.

4. Do a test before construction, extrude the glue to observe the curing situation, determine the dry time, and trim the surface within the dry time.

2, neutral transparent adhesive yellow is what reason?

A: neutral transparent adhesive yellow is the glue itself has defects, mainly caused by the neutral glue in the crosslinking agent and viscosifier, the reason is that these two raw materials with "amine", amine is very easy to cause yellow, many imports.. The glass glue is also yellow phenomenon. In addition, if neutral transparent adhesive is used at the same time with acid glass adhesive, it may cause the neutral adhesive to become yellow after curing; It may also be the effect of the long storage time of the glue or the reaction between the glue and the substrate.

3. Why does neutral porcelain white glue turn pink? Some gels cure a week and then return to porcelain white?

A: Alcohol type of neutral glue may have this phenomenon, it is caused by the production of raw materials titanium chromium compound. The titanium chromium compound itself is red, and the porcelain white color of the glue is the titanium dioxide in the glue. But glue is organic matter, and the vast majority of organic chemical reactions are reversible reactions, and there are side reactions. Temperature happens to be the key to causing these reactions. When the temperature is high, the positive reaction will change the color, but when the temperature is stable, the reaction will reverse and return to the original shape. Production technology and management of good, should be able to avoid this phenomenon.

4, some domestic transparent glue, play out five days later change porcelain white color? Neutral green glue after construction change porcelain white color, why?

Answer: This should also be a quality problem of glue, which belongs to the selection and verification of raw materials. Because some domestic glue with plasticizer, volatile; And some glue with more reinforcing filler, when the plasticizer volatile, the strip is stretched because of shrinkage, the color of the filler (neutral glue all the filler itself is white). A variety of color glue is to add pigment to make it into a variety of colors. If there is a problem in the choice of pigment, the color of the glue will change after construction; Or the color glue is too thin in the construction, the inherent small shrinkage of the glue in the curing process will make the color of the glue become lighter. In this case, it is recommended to maintain a certain thickness (more than 3mm) when sizing.

5, why the mirror on the back of the glass glue, after a period of time, the surface of the speckle or glue traces?

A: Mirrors on the market typically come in three different backside coatings: mercury, sterling silver and copper. Common mirror after a period of time, speckle surface, this situation should be the user used acid glass glue, and acid glass glue usually react with the material, resulting in speckle surface. Therefore, we emphasize that neutral adhesive should be selected, and neutral adhesive is divided into alcohol type and ketone oxime type two. If the copper base mirror chooses ketone oxime type neutral glue, ketone oxime will have slight corrosion on the copper material. After construction for a period of time, the mirror will see traces of corrosion at the gluing place behind it. If you use alcohol type neutral glue, this phenomenon will not occur. The above are due to the diversity of substrate caused by improper material selection. Therefore, it is recommended that users do a compatibility test before using glue to see whether the glue is soluble with the material. Choose appropriate glass adhesive products to avoid unnecessary losses.

6, some glass glue hit out of the size of the grain of salt particles, and after curing some particles will automatically dissolve, why?

Answer: This is the choice of glue raw materials on the issue. Because some glue contains some crosslinking agent, there is crystallization phenomenon in the low temperature environment, the crosslinking agent in the glue bottle condensation, play out will see the size of the grain salt powder, but it will slowly dissolve, so after curing the particle will automatically dissolve. This situation has little effect on the quality of the glue. This situation is mainly affected by low temperature.

7, some domestic glue on the glass, 7 days is still not dry glue, what is the reason?

A: Most of this happens in cold weather. First, glue is too thick, dry glue slowly. Second, the construction environment impact, bad weather. Three, the glue is expired or has problems. Four, the glue is soft, feel dry.

8, some domestic glass glue in the sizing bubble sound, what is the reason?

Answer: There may be three reasons: first, when the technology is not passed, the glue bottle mixed with air; Two, a few unscrupulous manufacturers deliberately do not press the bottom of the bottle, the bottle has air but gives people the feeling that the amount of glue is sufficient; Three, some domestic glue because it is not silicone glue, the increased filling material will have a slight chemical reaction with the PE soft glue of the glass glue packaging bottle, so that the plastic bottle has the phenomenon of swelling and increasing, the air retained in the space into the glue to create a gap, when sizing will play bubble sound. The effective way to overcome this phenomenon is: change to hard bottle packaging, pay attention to the product storage environment (under 30℃ cool).

The above is provided by glass glue manufacturers!

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