Epoxy floor paint blisters often occur on the first floor or in the basement, sometimes on the second floor or above. Epoxy floor paint blisters are usually found shortly after construction. Some morning-paved epoxy floors are used in the afternoon. There are blisters. The blisters grow from small to large and continue to develop. After a certain degree of development, they stop. The higher the temperature, the more likely the blisters will occur and the faster the development. Blister shapes vary and vary in size. Some blisters have a diameter of more than 1m and a height of 20~50mm.
There is no obvious relationship between the production of blisters and the construction area. Some areas in the same area are serious, some are lighter, and some are intact. In the same group of operations, the epoxy floor of the same material was used, some blisters, and some were intact, indicating that blisters were caused by many factors.
The cause of blisters is a problem that everyone cares about. When they open the blisters, they find that the bubbles contain moisture or yellowish liquid. The epoxy ground layer separates from the base layer, and the glue sticking to the base layer is pulled into a peak-like shape. See Figure 1-1; According to the "Physics" explanation, in a closed container filled with liquid, the liquid evaporates to form a saturated state of the three curves of temperature and pressure.
In a closed container, the pressure containing saturated water vapor rises with increasing temperature. When the temperature is 20.C, the pressure inside the bulge is 0.01 MPa; and when the temperature is between 70~80.C. It is a linear rise to 0.1 MPa; in many areas in the hot summer ground extreme radiant heat up to about 70.C, at such high temperatures, epoxy binder has been greatly reduced the softening and sticking force, so the shape of the tire gradually Drum, as in the epoxy ground layer, a large bag, the binder is pulled into a honeycomb; which does not blisters part of the epoxy layer and the ground part is not firmly, carefully observe the contact part, will also find The part that cannot be cured is because the epoxy cannot cure with moisture; then where does the moisture come from? There are mainly the following sources of water:
1. The base layer, such as cement mortar leveling layer, the maximum moisture content of about 12%, the maximum moisture content of the grass-roots level is greater than the leveling layer.
2. The dehydration in the other ingredients in the epoxy is not complete.
3. The combination of epoxy and base layer during construction does not leave the chemical activity of the voids and epoxy itself, is not fully cured or is a residue or gas that does not completely cure with moisture.
4. The ground floor penetrates the moist gas.
From the above four aspects, the moisture in the grass-roots is the main one, and the absolutely dry grass-roots layer is not. The moisture content cannot determine whether the epoxy floor will produce blisters. Some moisture and epoxy residues in the base layer are trapped in the epoxy and the base layer to form bubbles of different sizes because the epoxy layer itself does not Water vapor, moisture can not be discharged, leaving the foaming root seedlings. So bubbles are generated on the plane, mostly between the base layer and the epoxy layer; the moisture in the base layer is difficult to avoid, and this is an important factor that causes the epoxy floor to blisters.
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