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Artificial stone (also known as "artificial marble") is a new type of composite material, because it has no toxicity, no radioactive, flame retardant, non-stick oil, non-porous, antibacterial, mildew, wear, impact resistance, and easy The advantages of maintenance, stitching seamless, and arbitrary shape are gradually becoming the new darling of the decoration building materials market. What are the causes of bubbles and pockmarks on artificial stone surfaces? How to rule out?
1, the filler moisture content exceeds the normal index. When the moisture content of the filler particles is high, a tiny blisters will form around the resin. Since the resin curing is an exothermic process, the heat released by the resin breaks the balance of the particle-covered blisters, leaving the blisters to remain in the artificial stone matrix. Surface will appear bubbles, numbness.
2. The air is brought into the artificial stone matrix during the stirring process.
3, resin and curing agent, the proportion of initiator is not proper, the bubbles that remain in the matrix can not be discharged in time.
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. Excessive amplitude will cause the filler to deposit on the surface of the template, resulting in poor resin on one side, slow curing, small shrinkage, and low exothermic temperature; on the other side, due to the rich resin, curing Block, slow shrinkage, high exothermic temperature, prone to warping.
2, chemical defoaming method. The use of a polymerization inhibitor that has a retarding effect on cross-linked curing of the resin (commonly known as a defoamer) can prevent the polymerization of the resin for a certain period of time. After a certain period of time, the resin can be polymerized at a normal speed, and the time for the effective discharge of bubbles can be obtained. The use of this method has little effect on the exotherm 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 also be retarded, the deformation of the resin heat curve may affect the quality of the artificial stone.
3, stirring vacuum method. The use of stirring negative pressure keeps the artificial stone basically boiling, which is beneficial to the chemical reaction and the bubbles generated during the stirring process are easily eliminated.
Experience on the entrance decoration restaurant decoration marble building materials market
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