Soybean Protein Fiber SPF Fiber

Dyeing Property

The dyeing property of soybean knitted fabric with different kinds of dyes were tested and compared, as listed in Table.16.

Table.16 dyeing property of soybean knitted fabric with different kinds of dyes

Type of dyes	Color	Name of dyes	Levelness	Penetration property	Color fastness
Weak-acid dyes	Golden-yellow	Yellow RW	5	Good
	Bright-red	Bright-red F-3GL+ Pink BS	5	Good
	Cyan-blue	Cyan-blue 5GM	4	Relatively good
	Green	Yellow RW + Cyan-blue 5GM	4	Good
Neutral dyes	Mocha	Brown RL	2	Relatively bad
	Slate-grey	Black BL	3	Relatively good
	Pale purplish-red	Purplish-red GRL	3	Relatively bad
Weak-acid dyes + Neutral dyes	Beige	Yellow RW+ Brown RL	2	Relatively bad
Reactive dyes	Pale-yellow	Cibacron Yellow LS-R	4	Relatively good
	Azure-blue	Cibacron Blue LS-3R	3-4	Relatively good
	Navy-blue	Cibacron Navy-blue FN-B	4-5	Relatively good
	Pale-red	Lanasol Red 5B	5	Good
	Cobalt-blue	Megafix Cobalt-blueB-RV	4-5	Relatively good
substantive dyes	Black	Black 2V25	5	Good

Notes: the level is evaluated with five-grade standards: grade 5 is the best and grade 1 is the worst.

The test results of Table.16 indicate that the dyeing property of soybean fiber with neutral dyes is relatively bad (the level is low and penetration property is also bad). Therefore, the application of neutral dyes to soybean fiber must be cautious. The weak-acid dyes, reactive dyes and substantive dyes are suitable for soybean fiber, while due to the low color fastness to washing, the substantive dyes are usually not used to soybean fiber except very few colors. The dying fastness on soybean fiber is similar to wool with different dyes.