ARTIFICIAL MARBLE AND ITS PREPARATION

摘要

PURPOSE:To prepare an artificial marble having a marble grain-like appearance and reduced in the unevenness of the surface thereof by forming specific upper and lower gel coat layers on the surface of a back layer mixed with an aggregate. CONSTITUTION:An upper gel coat layer 3b is formed from a gel coat resin and a lower gel coat layer 3a is formed from a gel coat resin mixed with glass frit 4 on the formed upper gell coat layer 3b. On the lower gel coat layer 3a, a back layer 2 having a marble grain-like appearance is formed from a back layer resin mixed with an aggregate 1. The gel coat resin and the back layer resin include thermosetting resins such as unsaturated polyester resins, epoxy resins, phenolic resins and urea resins. For example, a liquid unsaturated polyester resin prepared by dissolving an unsaturated polyester resin (solid content) in styrene monomer can be adapted. The glass frit has preferable a particle diameter of 10-200mum and is compounded in an amount of approximately 50-200 pts.wt. per 100 pts.wt. of the gel coat resin. The aggregate 1 is an organic or inorganic aggregate having an particle diameter of approximately 0.5-3.0mm and is compounded is an amount of 30-400 pts.wt. per 100 pts.wt. of the back layer resin.