Frequently Asked Questions (FAQs) about Fluorescent Whitening Agent KSN
Time：2025-09-24Views：
I. Selection and Application
1. Which materials/processes is it suitable for?
It is compatible with plastics such as polyester, PP, PVC, and ABS, as well as silk/wool fibers. It can be used in processes including injection molding, extrusion, and granulation, and performs excellently in the processing of high-temperature rigid plastics.
2. What are the core differences from OB-1 and KCB?
It has high temperature resistance (melting point around 275℃), strong weather resistance, and no migration. The addition amount is only 80-200g per ton, but its cost is about 3 times that of OB-1.
3. Which scenarios are not applicable?
Formulations containing ultraviolet absorbers, infant textiles, and EVA foam shoe materials (as it affects foaming effect).
II. Usage and Effect
1. What causes uneven whitening or yellowing?
- The addition amount exceeds the upper limit (prone to supersaturation and yellowing);
- Insufficient dispersion (concentrated masterbatch is recommended);
- Improper compatibility with titanium dioxide (anatase type should be selected and the amount adjusted).
2. How to control the amount to balance effect and cost?
First, test with 200g per ton, then gradually reduce by 20-30g per ton to find the minimum amount that meets the whiteness requirement (80-150g per ton for films, 150-200g per ton for engineering plastics).
3. Which factors affect the effect during processing?
High temperature (easy to decompose when exceeding the critical temperature), raw material impurities (absorb ultraviolet light), and mismatched light stabilizers (avoid ultraviolet absorbers).
III. Safety and Storage
1. What to note for operational safety?
Wear gloves, masks, and goggles. Ensure ventilation in dusty environments. Rinse with clean water for 15 minutes immediately if it comes into contact with skin or eyes.
2. Storage requirements and shelf life?
Store in a sealed container at below 25℃ in a dry and ventilated place, protected from moisture and sunlight. The shelf life is 24 months.
3. How to judge if it is invalid?
Check the appearance (no caking, blackening, or moisture absorption), and compare the whiteness through a small test (it is effective if there is no significant decrease in whiteness).
