Epoxy resin has a variety of models, each with a different performance, its performance can be determined by the characteristics of indicators. Epoxy equivalent (or epoxy value): Epoxy equivalent (or epoxy value) is the most important characteristic index of epoxy resin, which indicates the content of epoxy in resin molecule. Epoxy equivalent means the mass grams of [url=http://careerversity.in/balcony/528.html]Plastic Composite Case[/url] epoxy resin containing 1 mol of epoxy groups, expressed as EEW. The epoxy value refers to the number of moles of epoxy groups in 100 g of epoxy resin. Epoxy equivalent = 100 / epoxy value Determination of epoxy equivalent of chemical and spectroscopic methods.

The international common chemical analysis perchloric acid method, there are other hydrochloric acid acetone method, a variety of epoxy resin models, each with different properties, the performance can be determined by the characteristics of indicators. Epoxy equivalent (or epoxy value): Epoxy equivalent (or epoxy value) is [url=http://careerversity.in/balcony/527.html]plastic exterior stacked stone panels[/url] the most important characteristic index of epoxy resin, which indicates the content of epoxy in resin molecule. Epoxy equivalent means the mass grams of epoxy resin containing 1 mol of epoxy groups, expressed as EEW.

The epoxy value refers to the number of moles of epoxy groups in 100 g of epoxy resin. Epoxy equivalent = 100 / epoxy value Determination of epoxy equivalent of chemical and spectroscopic methods. The internationally accepted method of chemical analysis of perchloric acid method, there are other hydrochloric acid acetone method, pyridine [url=http://careerversity.in/balcony/526.html]build a garden fence low cost ideas australia[/url] hydrochloride and hydrochloric acid dioxane method.

Acetone method is simple, easy to get reagents, easy to use. The method comprises the following steps of accurately weighing 0.5-1.5g resin in a stopper conical flask, adding 20mL acetone solution (1mL hydrochloric acid with a relative density of 1.19 in 40mL acetone) with a pipette, shaking with stirring to make the resin Completely dissolved, placed in the shade for 1 hour, hydrochloric acid and epoxy groups generated chlorohydrin, after adding methyl red indicator 3 drops, with 0.1mol / L NaOH solution titration excess hydrochloric [url=http://careerversity.in/balcony/525.html]Vinyl Fence Brown Installation Pack[/url] acid to red fade to yellow For the end. The same operation, without resin, make a blank test.