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Home  > Forum  > Testing & measuring  > Iodine value of alkyd resin

Sunday, 19 May 2019

Iodine value of alkyd resin

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Wednesday 31 May 2000 1:00:00 am

I want to know how the iodine value of alkyd resins based on drying/semi drying oils can be determined(Practical method).

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Friday 21 July 2000 1:00:00 am

The iodine value determination is used to ascertain the extent to which the bonds of the product in question can be regarded as unsaturated. In principle, it involves determining how many grams of iodine can be absorbed per 100 g of sample under defined conditions.
A frequently used (and standardised) method, e.g. ISO 3961 or ASTM D 1959 is the Wijs method starting from an iodine-containing Wijs solution and a sodium thiosulfate and indicator solution. It provides relatively exact values mainly with alkyd resins not containing a very large proportion of conjugated double bonds, but otherwise the results serve more as a guide. An important factor for comparison purposes, however, is that the Wijs method is highly reproducible.
If, on the other hand, the total number of unsaturated bonds is to be determined precisely in the presence of conjugated double bonds, the Rosenmund-Kuhnhenn method - albeit rather more complicated - is recommended (ASTM D 1541).

vanshree Satpute

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Monday 08 April 2019 7:18:59 am

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