Soium Lignosulfonate is usde as a disperse dye processing aid
Sodium Lignonsulphonate :
Sodium lignosulfonate has been widely used as a renewable resource.
① The dosage is generally 25%~110% of the original dye. Dosage
should not only consider the cost, but also according to the degree
of sulfonation of lignosulfonate to decide.
② The grinding time of the optimum dispersion state varies with
different dye structures.
③ Grinding pH value can express the strength of charge adsorption
of dye particles, which can intuitively understand the grinding
efficiency and dispersion degree of disperse dyes. The results show
that when using sodium sulfate lignosulfonate as dispersant to
grind dyes, the pH value of basic disperse dyes is 8~85, and the pH
value of acid disperse dyes is 5.5~6.
④ None of the synthetic dispersants can be adapted to the
processing of various disperse dyes, but sodium sulfate
lignosulfonate can produce different degrees of sulfonation
products by controlling the amount of sulfonating agents, the
temperature and time of sulfonation reaction, for the processing of
various disperse dyes.
⑤ Through the phenolic polycondensation reaction, the degree of
polymerization of sodium sulfate lignosulfonate was improved, so
that the thermal stability and viscosity of the sodium sulfate
lignosulfonate were improved, the phenolic hydroxyl group was
closed, and the quinone type was prevented.
| NO | Index items | Standard value | Test Results |
| 1 | Appearance | Dark brown powder | Meets the requirement |
| 2 | PH Value | 5-7 | 5.8 |
| 3 | Dry matter | 94%min | 94.50 |
| 3 | Moisture | 6.0%max | 5.5 |
| 4 | lignosulphonate | 40%mix | 48 |
| 5 | Total reducing matter | 9.0% max | 7.5 |
| 6 | Inorganic salt (Na₂SO₄) | 20%max | 17.5 |
| 7 | Water insoluble matter | 2.5%max | 1.95 |
| 8 | 120Mesh Sieve Residue | 5%max | 4.25 |
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