PVP K 90 Powder

Ulanqab Kema New Material Co., Ltd. is one of the most experienced manufacturers and suppliers of pvp k 90 powder in China. Please rest assured to wholesale high quality pvp k 90 powder made in China here from our factory. If you have any enquiry about free sample, please feel free to email us.

PVP K90 powder check

1.K value

Take l.00g of this product (calculated as anhydrous), accurately weigh it, put it in a 100ml measuring flask, add an appropriate amount of water to dissolve it, and place it in a constant temperature water bath at 25°C ± 0.05°C for 1 hour, then add water to dilute to the mark. Inspect according to the law (General Principle 0633 three methods), the measured relative viscosity is calculated by the following formula, and the K value should be 27.0~32.0.

2.PH value

Take 1.0g of this product (calculated as anhydrous), add 20ml of water to dissolve, and check according to law (General Rule 0631), the pH value should be 3.0-7.0.

3.Aldehyde

Take about 20.0g of this product (calculated as anhydrous), put it in a round bottom flask, add 180ml of 4.5mol/L sulfuric acid solution, heat to reflux for 45 minutes, let cool; take another hydroxylamine hydrochloride solution (take hydroxylamine hydrochloride 6.95g, add water Dissolve and dilute to 100ml, adjust the pH value to 3.l) 20ml with ammonia test solution, put it in an Erlenmeyer flask, then put the Erlenmeyer flask in an ice bath, connect the distillation device, insert the lower end of the condenser into the hydroxylamine hydrochloride solution Under the liquid surface, heat and distill until the total volume of the receiving liquid is about 120ml, stop the distillation, and titrate the distillate with sodium hydroxide titrant (0.1mol/L) to a pH of 3.1, and use the result of the titration For blank test calibration, the consumption of sodium hydroxide titrant (0.lmol/L) shall not exceed 9.lml.

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