News from our lab

Case History: Quantitative determination of black dye (Nigrosin)

« Back to list
Category: Laboratory

Problem Understanding: there is the need of determining the percentage of black dye (Nigrosin) in samples of polyamide 6 (PA6).

Providing you with the Solution: we have developped a method that can be involved to determine the percentage of dye Nigrosine in polyamide 6 Masterbatch that is based on the customer needs.

The Nigrosin is a basic dye, obtained by oxidation of aniline. It is prepared with aniline melting with nitrobenzene while iron filings or ferrous sulfate. Different shades of products colours are obtained at different reactions on components and mixed together such as green, blue, gray, black, and other shades of colours.

Our aim is to develop a method that can determine the percentage of dye (Nigrosin) that is contained in the material with the purpose of keeping track of the material features that is purchased. 

The technique involved in the analysis is the infrared spectroscopy (FT-IR) and it reports the quantity of colour contained in the masterbatch.

We as Plastanalisi have been able to determine effectively the right percentage of dye Nigrosin contained in three batches of material that were given from different suppliers in order to be analysed.

The results obtained showed that the content of Nigrosin was different in three analysed Masterbatches:

• Sample 1: 54% Nigrosin

• Sample 2: 47% Nigrosin

• Sample 3: 41% Nigrosin

At this point, the customer has been able to take into account all the elements involving the best material that can be suitable for his or her needs.

This Website uses technical and users' profiling cookies (first or third parties' ones) to send advertising messages in line with users' preferences expressed while web browsing. Keeping web browsing or entering any item of the website without changing your browser settings, means to implicitly accept to receive cookies on our website. You may change the settings of cookies at any time by selecting the “Privacy Policy” link in the website from which you may easily refuse to give consent to the installation of cookies.