Test Method for Performance of Softeners

To choose a softener , it is not about the hand feeling only. But there are many indicators to test.

1.Stability to alkali

Softener: x%

Na₂CO₃: 5/10/15 g/L

35℃×20min

Observe whether there is precipitation and floating oil. If no, the stability to alkali is better.

2.Stability to high temperature

Softener: x%

98℃×20min

Observe whether there is precipitation and floating oil. If no, the stability to high temperature is better.

3.Stability to electrolyte

Softener: x%

Anhydrous sodium sulphate or salt: 5/10/15 g/L

60℃×20min

Observe whether there is precipitation and floating oil. If no, the stability to electrolyte is better.

4.Stability to shear

Softener: x%

25℃, 2000r/min of high-speed shearing

Observe whether there is precipitation and floating oil. If no, the stability to shear is better.

5.Compatibility with Anionic Surfactant 

Softener: x%

Anionic auxiliary: 1/2/5 g/L

Place at 25℃ for 30min. Observe whether there is precipitation and floating oil. If no, the compatibility with anionic surfactant is better.

6.Test of application performance

(1)   Hand feeling: softness, smoothness and bulkiness

(2)   Influence on hydrophilicity

(3)   Yellowing

(4)   Launderability

(5)   Influence on dyeing fastness or not

(6)   Does it smell bad? (Contains solvent or not)

(7)   Compatibility with whitening agent

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