Some low grade silicone glue on the glass, what is the reason for a long time not curing? Let's have a look at the old master of Auman environmental protection is how to introduce it!

JBR: There are several phenomena

(1) The weather is cold and the temperature is low; The air humidity is low and the climate is dry.

(2) glue is too thick, dry glue slowly.

(3) Construction environment impact, glue expired or have problems.

(4) soft glue, feel dry.

(5) The effective content of silicone rubber is not enough, and the quality of itself is problematic.

Some low grade silicone glue appears in the sizing "pop", "pop" bubble sound, what is the reason?

JBR: The technology of packaging is not up to standard, and the glue bottle is mixed with air;

(2) low grade glue because it is not the best silicone glue, the increase of some filling material will promote the glue bottle swelling phenomenon, space retained in the air into the glue to create a gap, in the sizing will play "pop", "pop" bubble sound.

(3) Pay attention to the storage environment of the product (cool place below 30℃).

Why do some summer neutral glue in concrete and metal window frame in the combination of curing parts will appear a lot of bubbles, and some will not? Why hasn't this happened before?

JBR: Many brands of neutral glue have had similar phenomenon, after careful testing and repeated experiments to confirm that the quality of the glue is not the problem.

Because there are two kinds of neutral glue, dealcoholization type and deketoxime type, and alcohol type glue in the curing process of methanol will release gas (methanol starts to volatilize at about 50℃), especially when the sun or high temperature reaction is more intense.

In addition, concrete and metal window frames are difficult to breathe, and the summer temperature and humidity are high, the curing will be faster, the gas released by the glue can only run out of the never completely cured rubber layer, and the bubbles of different sizes will appear on the cured rubber strip.

And ketone oxime type neutral glue in the curing process will not release gas, will not produce bubbles. But the disadvantage of ketone oxime type neutral glue is that once the technology and physical treatment is not good, there is a chance of shrinkage and cracking phenomenon when it is cold in the curing process in winter, and the technology is good, there is no such phenomenon. Of course, the neutral glue of ketone oxime type is slightly more expensive than alcohol type.

In recent years, silicone sealant has been widely used, which has greatly improved the grade of engineering quality. However, due to the ignorance of material characteristics, improper material selection has caused the foaming phenomenon of sealant.

The following points should be paid attention to in solving similar problems:

.. It is prudent to do a local use test first to observe whether it meets the use needs (generally two or three days after sizing can see the reaction);

Second, distinguish the use of time and base material type, choose the appropriate neutral adhesive use, summer choose ketone oxime type, winter choose alcohol type;

Third, keep the construction surface clean and dry;

Fourth, summer sizing should avoid high temperature period (above 35℃) and direct sunlight, generally in the evening is more appropriate.

Why can neutral porcelain white glue have pink phenomenon? Some gels cure a week and then return to porcelain white?

Dealcoholization 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 the glue is organic matter, and the vast majority of organic chemical reactions can be produced technology and good grasp, can avoid this phenomenon.

Some low grade transparent glue, hit out five days later change porcelain white color? Neutral green glue after construction change porcelain white color, why?

This should be a quality problem of glue, which belongs to the selection and verification of raw materials.

Because these low-grade 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 2mm) when sizing.