颜料红81

Pigment Red 81 (PR81) is a vibrant, synthetic organic pigment belonging to the Lake class. This means it is not a pure pigment in itself, but an insoluble aluminum or calcium salt of a water-soluble azo dye (specifically, derived from the acid dye). This "laking" process transforms the soluble dye into a solid, stable pigment with good coloristic properties.

Its most defining characteristic is its clean, bright bluish-red to magenta shade, often described as Rhodamine-like. This makes it highly valued for applications requiring intense, eye-catching fluorescence or high-visibility color, though the non-fluorescent grades are more common. It offers very high tinting strength and good lightfastness in mass tone, although its durability can diminish significantly in pale tints.

PR81的主要限制是其化学耐受性差，尤其是对酸和碱。也不建议用于长时间接触水或高温的应用。

其主要用途利用了其卓越性能：

• Inks: Widely used in flexographic and gravure packaging inks, especially for posters, magazine covers, and labels where visual impact is critical.

• Coatings: Employed in industrial and architectural finishes where maximum chroma is desired, though its use is limited to applications not exposed to harsh chemicals or weathering.

• Plastics: Suitable for coloring PVC, polyolefins, and other polymers processed at lower temperatures, often incorporated via masterbatch. It is also a common colorant for synthetic fibers like polypropylene.

总之，颜料红81是一种具有成本效益的高强度颜料，以其鲜艳的红洋红色调而受到重视，适用于不需要极端化学和耐候性的应用。