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| Trade News |
| Epoxy resin method of identifying trees |
| 2007-12-21 12:39:52 |
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The converted epoxy curing epoxy resin or in the cross-linked modules, are not the attributes of a simple test method. Gibbs on the epoxy phenol test is positive with Indigo reaction (because of bisphenol A). With the phenol resin contrary, the change of formaldehyde chromium acid test is negative reaction.
When less than 260 ° C for pyrolysis, all will have an epoxy resin acetaldehyde. Steps: In pyrolysis test tube Add Paradox, with a new preparation of the mouth of 5 percent nitro sodium cyanide and morpholine aqueous solution wetting the filter paper coverage, in the oil bath heated to 240 ° C. Pyrolysis gas through paper released when. Variable filter paper that is blue epoxy resin.
Issued method can also be used more epoxy resin identification: at room temperature, from about 100 mg of resin in about 10 ml concentrated sulfuric acid, before adding about 1 ml concentrated nitric acid. Five minutes later, carefully plus 5% NaOH aqueous solution to the top, if there were bisphenol A epoxy resin, a two-tier solution interface will appear cherry red.
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