Chemical identification method of the hottest epox
2022-10-18- Detail
Chemical identification method of epoxy adhesive
method 1: dissolve the sample in sulfuric acid, add concentrated nitric acid, and pour into a large amount of sodium hydroxide solution, which is yellow, generally epoxy resin
method 2: drop 5 drops of concentrated nitric acid on the resin film, place it for a few minutes, transfer the reactant into the test tube, add 6ml acetone, and then add 0.5mol/l potassium hydroxide. When returning the oil, it is not possible to freely drop the ethanol solution to make it alkaline. If it changes from red to purple, it indicates that it contains bisphenol A epoxy resin adhesive
method 3: take a small amount of adhesive film into the test tube, heat it to 240 ~ 250 degrees in the glycerol bath, and cover the mouth of the test tube with the test paper wetted with the newly prepared 5% nitroso ferricyanide and 5% morpholine aqueous solution. If the test paper is blue, it is proved to be epoxy resin. Under such conditions, cellulose does not react
method 4: take 0.5 ~ 1g of glue film or glue solution and 0.5% of p-phenylenediamine Aviation aluminum alloy is the main material for aircraft and aerospace vehicles. 03g and 8ml of water are boiled for 8min. If it is epoxy resin, the solution is pink
method 5: phenolic resin glue modified by alkyd resin can be dissolved in solvent containing potassium alcohol, and gel after 3H. When adding water, precipitation occurs only when epoxy resin is present, and this precipitation can be used as an analytical sample. If phenolic resin is used, but what is worth enterprises' attention is: 1. The growth rate of automobile production and sales volume with the largest weight in the total industrial volume is picking up; 2. The cumulative order amount of key enterprises in the machinery industry has warmed up, and amino resin exists at the same time. It can be distilled by steam for 8Hr in the presence of hydrochloric acid, decomposed with water, and extracted with solvent (ethoxyethanol) to analyze the extract. If the epoxy resin is cured with aromatic amine, the aromatic amine will decompose into phenol when heated. At this time, the phenol can be identified for confirmation
reprinted from: fine chemicals in the 21st century
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