Klassificering af syrefarvestoffer

2021-01-08

Klassificering afsyrefarvestoffer

Syrefarvestofferklassificeres i stærk syre, svag syre, syremedier, syrekompleksfarvestoffer osv. i henhold til deres kemiske struktur og farvningsbetingelser.


1)Strong syrefarvestoffer Det tidligste udviklede syrefarvestof kræver farvning i et stærkt syrefarvestofbad. Den har en simpel molekylær struktur, lav molekylvægt, indeholder sulfonsyre eller carboxylgrupper, har ringe affinitet for uld og kan bevæge sig jævnt på uld. Det er jævnt farvet, så det kaldes også syre-niveau farvestoffarve, men skyggen er ikke dyb, vaskefastheden er dårlig, og ulden beskadiges under farvning, og den farvede uld føles dårlig. Såsom Acid Red G.

2)Weak syrefarvestoffer In strong syrefarvestoffer, weak syrefarvestoffer are formed by increasing the molecular weight, introducing groups such as arylsulfone groups, or introducing long carbon chains. The molecular structure is more complex, and it has a greater affinity for wool. It can dye wool in a weak acid medium without damage to the wool. The shade is darker and the fastness is improved, but the dyeing is uneven. Such as weak acid brilliant blue RAW (ie C.I. Acid Blue 80). 

3)Sur mordant farvestof After treated with certain metal salts (such as chromium salts, copper salts, etc.) as mordants, syrefarvestoffer that form metal complexes on the fabric. Mordant dyeing procedures are more complicated, but dyes with better properties such as light fastness, washing fastness, and rubbing fastness can be obtained, such as acid mordant black T (ie C.I. mordant black 11).


4)Syre-komplekse farvestoffer I.t is formed by complexing some syrefarvestoffer with metals such as chromium and cobalt. It is soluble in water, and its dyed products have excellent light fastness and light fastness. Its dye matrix is similar to acid mordant dyes, but in the preparation of dyes, metal atoms have been introduced into azo dye molecules, and the ratio of metal atoms to dye molecules is 1:1, so it is also called 1:1 metal complex dye. There is no need to use mordant for dyeing. Such as acid complex yellow GR (ie C.I. Acid Yellow 99).