Study on the Photochromic Phenomenon of Methyl Tin Mercaptide
Methyl tin mercaptide(abbreviated as methyl tin)is a widely used heat stabilizer in the plastic processing process.During the transportation and use,methyl tin will discolor due to the exposure to sunlight.Xenon lamp was used to simulate sunlight to study the discoloration of methyl tin.The results show that ultraviolet light with a wavelength of 280-400 nm causes the discoloration of methyl tin.The presence of oxygen can effectively inhibit the discoloration of methyl tin.The acid value has a significant effect on the speed and degree of discoloration.After discoloration,a new product(2-ethylhexyl acetate)is formed.The brown powdery discoloration substance can be obtained by dissolving and washing the discoloration mixtures with petroleum ether for several times,which is consist of stannous sulfide(SnS),tin sulfide(SnS2)and adsorbed tin mercaptide.The photochromism mechanism of methyl tin is speculated,which provides a reference for explaining the photochromism phenomenon of methyl tin and inhibiting the occurrence of discoloration.
Methyl Tin MercaptideHeat StabilizerDiscoloration MechanismXenon Light Source
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