US 11,747,255 B2
Method for designing formula of water-based printing ink based on low-field nuclear magnetic resonance
Guoqiang Chen, Jiangsu (CN); Chengyong Gao, Jiangsu (CN); and Tieling Xing, Jiangsu (CN)
Assigned to NANTONG TEXTILE & SILK INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Nantong (CN); and SOOCHOW UNIVERSITY, Jiangsu (CN)
Filed by NANTONG TEXTILE & SILK INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Nantong (CN); and SOOCHOW UNIVERSITY, Jiangsu (CN)
Filed on Jul. 23, 2020, as Appl. No. 16/947,207.
Claims priority of application No. 201910844088.8 (CN), filed on Sep. 6, 2019.
Prior Publication US 2021/0072133 A1, Mar. 11, 2021
Int. Cl. G01V 3/00 (2006.01); G01N 13/00 (2006.01); C09D 11/38 (2014.01); G01N 24/08 (2006.01); G01R 33/44 (2006.01)
CPC G01N 13/00 (2013.01) [C09D 11/38 (2013.01); G01N 24/08 (2013.01); G01R 33/448 (2013.01)] 8 Claims
OG exemplary drawing
 
2. A method for selecting a water-based printing ink based on low-field nuclear magnetic resonance (LF-NMR), comprising the following steps:
(1) acquiring LF-NMR echo signals of one or more water-based printing inks by using a Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence to obtain an echo attenuation curve, wherein the CPMG pulse sequence has the following parameters: 90° pulse width P1: 8.0 μs, 180° pulse width P2: 15 μs, waiting time: 12,000.00 ms, analog gain: 20.0, digital gain: 3, preamp gain: 1, number of scans: 4, number of echoes: 12,000, receiver bandwidth: 100 KHz, and radio frequency delay: 0.150 ms;
(2) deriving a spectral curve of a transverse relaxation time T2 by using an inversion algorithm thereof based on the echo attenuation curve; and
(3) determining moisture retention and/or fluidity of the water-based printing inks according to a peak area and a displacement of immobile water and free water in the spectral curve of the transverse relaxation time T2, and selecting a water-based printing ink with moisture retention and/or fluidity meeting a target value.