Vulcanization black dye is to contain the high polymer compound with more sulfur, 2 sulfur key and much sulfur key are contained in its structure, and very flabby calm. Especially much sulfur key issues the oxide that can be oxidized to be sulfur by the oxygen in air in condition of constant temperature, humidity, farther with the water element in air action is generated vitriolic, make yarn puissant consequently reduce, fiber fragile caustic, serious when fiber is all fragile change powder. With vulcanization for this the yarn after black dye coloring is decrease or prevent fiber fragile damage, must notice the following:
Dosage of ① vulcanization black dye should try to restrict, the silky luster of mercerized cotton fabrics is special dosage does not exceed yuan of lubricious dye 700g ／ bag. Because dye dosage is tall, hair fragile opportunity is great, at the same time colour fastness is reduced, bath is more difficult also.
Sufficient bath answers after ② coloring, prevent bath ungodliness, the float color on yarn is easy decompose in process of keep in storage vitriolic and make fiber fragile caustic.
Natrium of urea, soda ash, acetic acid must be used to wait after ③ coloring undertake preventing fragile processing.
Clear water is used to boil practice before ④ yarn coloring, after via the experiment clear water boils experienced yarn coloring fragile change degree to boil practice to be close friends than lye a few.
The yarn after ⑤ coloring should seasonable drying, because wet gauze is in process piling buy,give out heat easily, make yarn prevents fragile agent content to reduce, PH value is reduced, fragile to preventing adverse. After yarn drying, answer to cool naturally, make the thermal drop of yarn comes room temperature is rear can bale. Because of stoving hind not classics is cooling, bale instantly, criterion quantity of heat sends out not easily, decompose unripe acid to increase energy to dye, cause fiber to send fragile possibility to greaten.
⑥ is chosen prevent fragile vulcanization black dye, this kind of dye already added formaldehyde and chloric second acid when make, the armour — that makes from this is chloric model vulcanization is prevented fragile black, make the sulfur atom of easy oxidation becomes stable structural state, can prevent sulfur atom to oxidation makes acid and make fiber fragile thereby caustic.