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How to eliminate bubbles on the surface of artificial stone

Mar 12, 2019

There are usually three ways to exclude:

1. Vibration defoaming method. The use of this method should pay attention to the amplitude, frequency and vibration time of the platform. The amplitude is too large to deposit the filler on the surface of the template, resulting in one resin lean, slow curing, small shrinkage and low exothermic temperature. The other side is cured by resin. Block, slow shrinkage, high exothermic temperature, prone to warping.

2. Chemical defoaming method. The polymerization inhibitor (known as defoamer) which has a retarding effect on the cross-linking of the resin can prevent the polymerization of the resin in a certain period of time. After a period of time, the resin can be polymerized at a normal speed to obtain time for the effective discharge of the bubbles. The use of this method has little effect on the heat release caused by the curing of the resin. If the amount of the initiator and the accelerator is reduced, although the polymerization of the resin can be delayed, the quality of the artificial stone is affected by the deformation of the heating curve of the resin.

3. Stirring vacuum method. The artificial rock is kept substantially boiling by the stirring negative pressure, which is beneficial to the chemical reaction and the bubbles generated during the stirring process are easily eliminated.

The above three methods, especially in combination with the third method, are practical, reliable, and have the effect of long-term use of one investment. The second method, although simple, is too expensive for mass production.