Combustibility evaluation method of metal powder and solvent mixture thereof

Abstract

The invention discloses a combustibility evaluation method of metal powder and a solvent mixture thereof. The method comprises the following steps: firstly, standing a mixture and observing whether the mixture has a solvent layer or not; if so, testing a closed cup flash point of the solvent layer; if a measured closed cup flash point value is more than 60 DEG C, determining that the mixture is a common chemical; if the measured closed cup flash point value is smaller than 60 DEG C, determining that the mixture is flammable liquid; secondly, combusting metal powder without the solvent layer; testing a solid combustion speed of the metal powder; if a measured combustion speed value is more than 2.2mm / s, determining that the metal powder is a flammable solid; then, measuring a closed cup flash point of a mixture with the measured combustion speed value smaller than 2.2mm / s; if the measured closed cup flash point value is more than 60 DEG C, determining that the mixture is the common chemical; finally, continuously combusting the mixture with the closed cup flash point value smaller than 60 DEG C and observing whether the mixture is continuously combusted or not; if so, determining that the mixture is the flammable solid; otherwise, determining that the mixture is the common chemical. The method disclosed by the invention has the advantages of reliable evaluation results and stable utilization conditions.

Description

technical field [0001] The invention relates to the technical field of evaluation of dangerous inflammables, in particular to a method for evaluating the combustibility of metal powder and its solvent mixture. Background technique [0002] Metal powder and solvent mixtures are commonly used metal pigments, such as aluminum silver paste. The state of the metal powder and solvent mixture is different due to the amount of solvent content. If the solvent content is high, the solvent and the agglomerated metal powder are clearly separated. If the solvent content is low, it is a paste or block. After the surface of the metal powder is coated with an organic solvent, the risk is reduced and the hidden danger of metal dust explosion is eliminated. However, the added organic solvents, such as kerosene and solvent oil, are flammable, so there is still a risk of explosion. [0003] At present, in the testing standards of chemicals / goods at home and abroad, the state is first identifie...

AI Technical Summary

Problems solved by technology

According to the provisions of the "Global Harmonized Chemical Classification and Labeling System" (hereinafter referred to as GHS), liquid means that the vapor pressure does not exceed 300kPa at 50°C, it is not completely a gas at 20°C and the standard pressure of 101.3kPa, and it has a melting point at standard pressure. Or substances or mixtures with an initial melting point of 20°C or lower; for viscous substances or mixtures, the test of ASTM D4359-2012 should be carried out, or the fluidity specified in Section 2.3.4 of Annex A of the European Agreement on the International Carriage of Dangerous Goods by Road test (penetrometer test); due to the particularity of its composition, the metal powder and solvent mixture cannot be tested for state identification related parameters

Therefore, there is currently no clear method for judging the flammability of special chemicals such as mixtures of metal powders and organic solvents.

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