UATR and NIRA evaluation in the quantification of ATBC in NC blends

Mello, Talita de Souza Dias; Diniz, Milton Faria; Dutra, Rita de Cássia Lazzarini

doi:10.1590/0104-1428.16816

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Original Article • Polímeros 28 (3) • Jul-Sep 2018 • https://doi.org/10.1590/0104-1428.16816 copy

UATR and NIRA evaluation in the quantification of ATBC in NC blends

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The paint industry requires rapid and accurate methodologies of raw materials qualitiy controls. For example, the evaluation of the suitable ratio of binary mixtures of polymer/plasticizer such as nitrocellulose (NC)/acetyl tributyl citrate (ATBC) must be done, since this ratio is directly related to the performance of the final product. However, there is a small number of quantitative methodologies of such control in the literature. In this context, in this paper, the applicability of Infrared Fourier Transform Spectroscopy (FT-IR) techniques by using universal total attenuated reflection (UATR), in the middle infrared (MIR), and the reflectance analysis in the near infrared region (NIRA) is evaluated for the quantification of plasticizer ATBC in mixtures with NC. MIR and NIR methodologies presented good results such as: practicality of not requiring refined sample preparation, analysis time about 30 min and good accuracy, suitable data for using in the quality control laboratories of paint industry.

Keywords:
ATBC; NC; NIRA; paints; UATR

Samples ATBC/NC (relative concentration)	A₁₇₄₀/A₁₆₅₁	Median A₁₇₄₀/A₁₆₅₁ (µ)	Standard deviation	Deviation or relative error (%)
10/90 (0.11)	0.082	0.082	0.001	1.22
	0.082
	0.083
	0.082
	0.087
15/85 (0.18)	0.135	0.137	0.001	0.73
	0.139
	0.137
	0.135
	0.137
18/82 (0.22)	0.158	0.151	0.003	1.99
	0.151
	0.153
	0.143
	0.143
	0.162
	0.170
19/81 (0.23)	0.167	0.167	0.001	0.60
	0.169
	0.162
	0.186
	0.184
20/80 (0.25)	0.181	0.184	0.001	0.54
	0.189
	0.184
	0.186
	0.185
22/78 (0.28)	0.184	0.186	0.001	0.54
	0.186
	0.187
	0.337
	0.342
30/70 (0.43)	0.352	0.352	0.004	1.14
	0.354
	0.360

SAMPLES ATBC/NC (nominal relative concentration)	A₁₇₄₀/A₁₆₅₁	Median A₁₇₄₀/A₁₆₅₁ (µ)	Standard deviation	Deviation or relative error (%)	Calculated sample ATBC/NC (relative concentration)
14/86 (0.16)	0.109	0.107	0.001	0.93	13.4/86.6 (0.15)
	0.104
	0.107
	0.109
	0.104
16/84 (0.19)	0.139	0.137	0.001	0.73	16.04/83.96 (0.19)
	0.136
	0.137
	0.136
	0.142
17/83 (0.20)	0.154	0.155	0.002	1.29	17.6/82.4 (0.21)
	0.155
	0.156
	0.153
	0.162

Proportion of ATBC in sample	A₅₈₄₀	Median A₅₈₄₀ (µ)	Standard deviation	Deviation or relative error (%)
10	0.088	0.092	0.001	1.09
	0.091
	0.094
	0.095
	0.092
15	0.112	0.116	0.002	1.72
	0.119
	0.123
	0.110
	0.116
20	0.136	0.127	0.003	2.34
	0.120
	0.127
	0.134
	0.126
30	0.178	0.178	0.003	1.68
	0.175
	0.178
	0.163
	0.179

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