Calcium carbonate extenders and titanium dioxide opacity u2014 the filler and pigment package that controls hiding, film build, and cost in architectural and industrial coatings.
無機充填材と体質顔料は、塗料に隠蔽力と膜厚を与え、単位容量当たりのコストを下げる粒子状の固形分です。 これらは2つの役割に分かれます: 隠蔽性顔料 — 光を散乱させて隠蔽を担う酸化チタン — と、 体質顔料 (炭酸カルシウムなど)はごくわずかなコストで体積を占めます。実用的な配合ではその両方を使います。隠蔽力は酸化チタンで確保し、そのうえで必要な仕上がりに合わせた粒度の体質顔料で顔料体積を稼ぎます。
Titanium dioxide is usually the most expensive raw material in a paint formula, so extender and spacing strategy drives cost more than any other pigment decision. Calcium carbonate is the standard extender: it fills volume, supports the film, and lets a formulator hold hiding while trimming titanium dioxide content. The honest trade-off is opacity. Replace too much titanium dioxide with low-refractive-index extender and hiding falls off, so balance the swap against the contrast ratio your spec requires.
Calcium carbonate carries most extender duty across primers, fillers, and architectural paints, while zinc oxide serves as a multifunctional white pigment where formulators want added function alongside color. Filler loading itself is the second trade-off. Raising the pigment volume concentration cuts material cost, but above the critical PVC a film can lose gloss, scrub resistance, and durability. Set loading against the gloss and exposure target for the finish rather than cost alone, and confirm any regulatory status for your market.
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