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Why does the surface of artificial stone foam? How to eliminate it? 2020-10-20
Why does the surface of artificial stone foam? How to eliminate it?

1. The moisture content of the filler exceeds the normal index. When the water content of the filler particles is high, a tiny blister will be formed around it. Since the resin curing is an exothermic process, the heat released breaks the balance of the particles out of the blister, leaving the blister in the artificial stone matrix. Bubbles and pitted surfaces will appear on the surface.
Why does the surface of artificial stone foam? How to eliminate it?
2. Air is brought into the artificial stone matrix during the stirring process.

3. Improper proportions of resin, curing agent, and initiator, and bubbles remaining in the matrix cannot be discharged in time.

There are usually three elimination methods:

1. Vibration defoaming method. The use of this method should pay attention to the amplitude, frequency and vibration time of the platform. If the amplitude is too large, the filler will be deposited on the surface of the template, causing one side to be resin-poor, slow curing, small shrinkage, and low exothermic temperature; while the other side is rich in resin, curing Block, slow shrinkage, high exothermic temperature, prone to warping.

Why does the surface of artificial stone foam? How to eliminate it?

2. Chemical defoaming method. The use of a polymerization inhibitor (commonly known as a defoamer) that retards the crosslinking and curing of the resin can prevent the resin from polymerizing within a certain period of time. After a period of time, the resin can polymerize at a normal speed, gaining time for the effective discharge of bubbles. The use of this method has little effect on the exotherm caused by resin curing. If the amount of initiator and accelerator is reduced, although the polymerization of the resin can also be delayed, it will deform the heating curve of the resin and affect the quality of the artificial stone.

Why does the surface of artificial stone foam? How to eliminate it?

3. Stirring and vacuuming method. Adopting the negative pressure of stirring to keep the artificial stone basically boiling, which is conducive to the chemical reaction and the easy removal of bubbles generated during the stirring process.


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