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Zinc sulfide (ZnS) has so many functions! ?

wallpapers News 2021-05-14

Zinc sulfide is a white powder. Has good chemical stability and alkali resistance, when acid release hydrogen sulfide (rotten eggs!) . Can be used as white pigment. The Pigment code used as a Pigment was: C.I. Pigment White 7 (abbreviated P.W.7). Zinc sulfide pigment Mohs hardness is low, soft texture (soft than titanium dioxide), processing of the machine metal wear is small, greatly prolong the service life of processing machinery.
The spectral reflectivity curves of zinc sulfide pigments are shown below, indicating that the pigments reflect significantly in the short wavelength region of visible light. That is to say, zinc sulfide in the near ultraviolet light region (less than 400nm) less light absorption than titanium dioxide, so the color than titanium dioxide to blue (can compare the spectral reflectivity curve of titanium dioxide to see their difference), especially with fluorescent whitening agent can be made with excellent whiteness and brightness of color.

Refractive index of zinc sulfide
The refractive index is about 2.36. (High refractive index, strong ability to scatter light, showing a high hiding power)
Titanium dioxide refractive index 2.55~2.73. (can compare the refractive index of plastic - polycarbonate PC: 1.58, ABS: 1.56) that is to say, zinc sulfide hiding power is only about 60~65% of titanium dioxide.
The index of refraction actually varies with the temperature, and in general, the higher the temperature, the higher the index of refraction. Optionally for transparent or semi-transparent object color, the higher the temperature, the more opaque the color.
 
Flame retardancy of zinc sulfide
Some or all antimony trioxide can be replaced by ZnS.
As a white pigment, showing a bright hue, approximately equal to 60% of the whitening power of titanium dioxide (titanium dioxide). With ZnS as flame retardant, can save the amount of titanium dioxide (titanium dioxide), and non-toxic.

Infrared transmittance of zinc sulfide
Zinc sulfide crystal is an important infrared transmittance material with good optical properties in the mid-infrared and far-infrared regions.
The transmittance curve of ZnS crystals prepared by chemical vapor deposition is stable in the far infrared region of 8 ~12 μm (8000~ 12,000 nm), and the transmittance can reach over 73%. However, the transmittance begins to decline in the far infrared region of 3 ~5 μm (3000~5000nm). Especially in the visible light region (380~780nm), the transmittance drops rapidly and the transmittance becomes worse. After polishing, the naked eye can observe that the crystal interior presents a cloudy state, which leads to the poor transmittance of the crystal in the visible light region.
It was found that the internal structural defects of these crystals could be reduced or eliminated after post-treatment. If the process conditions were strictly controlled during the growth process, the structure would be improved, but complete transparency would need to be realized through post-treatment.

Zinc sulfide crystal is used as the window of infrared detector, with a diameter of 18~30mm and a thickness of 1~3mm. Some large diameter zinc sulfide Windows produced by some processes are used in large and medium power infrared detectors.
Fluorescence effect of zinc sulfide
When exposed to light, zinc sulfide emits a faint greenish glow. If a trace of Cu (copper), Mn (manganese), Ag (silver) is added in the crystal zinc sulfide as the activator, it can emit different colors of fluorescence.

 


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