Preparation of Epoxy Resins from Bisphenol A and Epichlorohydrine

Preparation of Epoxy Resins from Bisphenol A and Epichlorohydrin 

Safety precautions Before this experiment is carried out, Sect. 2.2.5 must be read as well as the material safety data sheets (MSDS) for all chemicals and products used. 

The equivalent weight is the amount of resin that contains one equivalent of epoxide this is equal to 100/epoxy value. 

With an omme After determining the epoxy value and equivalent weight of the resin prepared according to b), a small sample is melted in the oven at 150 °C with the equivalent amount (0.25 mol per mol epoxy groups) of finely powdered 4,4 -methylenedi-aniline and the mixture well stirred for 30 s. After heating for 1 h at 150 °C, the sample is taken out it has now become insoluble and infusible. 

With a carboxylic add anhydride S g of the resin prepared according to a) are melted in a beaker at 120 °C and 1.5 g of phthalic acid anhydride (0.6-0.8 equivalents per equivalent of epoxy groups) are stirred into the melt.The mixture is held at 120 °C for 1 h (after this time the resin is still soluble in acetone or chloroform) and then cured at 170-180 Cfor1-2h. 

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Example 4.24 Preparation of Epoxy Resins from Bisphenol A and Epichlorohydrin... 

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