How to understand the misunderstanding of leather products of chromium pollution
source：Guangzhou Geao Polymer Materials Co.,Ltd date：2014-11-14
In the understanding of the relationship between the valence state transformation characteristics and trivalent chromium chromium and chromium six post, can clear six chromium is the initiator of evil pollution by chromium, trivalent chromium was proved to be harmless. So in leather products two how form? Whether oxidation will occur and generate six chromium on human health hazard reduction reaction in leather processing process?
In general terms, the collagen fiber of trivalent chromium fixed hard oxidized to form six chromium, because the reaction speed is very slow, and only at temperatures above 800 degrees C, and accompanied by the oxidation reaction conditions, will it be possible to change into trivalent chromium chromium six. Obviously in the normal production and life, can not meet the trivalent chromium oxide is six valence chromium conditions, so the reaction can not be carried out.
Yet another view pointed out that although the trivalent chromium cannot be converted to six prices chromium directly, but not through the active organic matter (ROS) intermediates are indirect oxidation into six chromium? Some researchers pointed out that some of the chemicals found in the leather industry, they can generate free radicals as by ultraviolet irradiation or bleaching / cleaning process, these free radicals even in general can be oxidized into trivalent chromium chromium six. This kind of free radicals produced by unsaturated groups, such as the part of a lot of cheap or low fatliquoring agent, wax and oil. To solve this problem, the oxidation reaction to produce leather workers to avoid, to use a certain amount in the leather of the scavenger and antioxidant, or absolutely avoid using these will have trouble chemicals used in free radical scavenger can produce after the immediate capture is not reversible elimination of free radicals, made into a stable component. So the trivalent chromium oxidation process will not happen, thereby eliminating the potential risk of oxidation.
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