PVC plastic products we can use OB.OB -1. KCB, KSN, FP-127, but finally we chose to use OB-1
and FP-127 due to use effect and cost
OB-1 is bright yellow green crystal powder, melting point of 350-355 ℃,it is blue color. which is the
best heat resistance among all optical brighteners at present. It can be used for whitening PE, PP,
PVC, ABS, PA, PC and other plastics. Its dosage is low, adaptability is strong, dispersibility is good.
excellent heat resistance and climate resistance, and can be used for whitening plastic products for
food packaging and children's toys.
Advantage:
1. OB-1 is one of the best and cheapest optical brighteners for plastics
2.Optical brightener OB-1 is the highest temperature resistance optical brithener,.The temperature
resistance can be 350 degrees, especially suitable for plastic products requiring high-temperature processing
3. OB-1 has high color and light intensity, OB-1 is divided into green phase and yellow phase products .
The fluorescence of green phase is blue, yellow phase is blue and purple,sowe usually use green phase type OB-1
4.less dosage:
Advise dosage:Transparency: 0.-0.005% (2.5g-5g)
General dosage: 0.-0.025% (2.5g-25g), not more than 0.03% (30g)
Disadvantages:
Poor weather resistance, easy migration and precipitation, poor stability, and products prone to yellowing
and discoloration
Link to Ogilvy
Optical brighener FP-127 is a light yellow powder, and a melting point of 219-221 ℃.it is blue color, It is
suitable for whitening various plastic products, especially for PVC and polystyrene with better compatibility
and whitening effect. It is especially suitable for soft PVC products. It has the advantages of long-term storage
without yellowing and fading
Compared with the optical brightener OB-1, FP- 127 has no migration problem, better weather resistance
and stability, but the temperature resistance of FP-127 is not as strong as OB-1, but it can also withstand
the temperature of 220 ℃, which meets the production temperature of most PVC.
The recommended dosage FP-127
PVC: whitening: 0.01-0.05% (10-50g / 100kg material);
Transparency: 0.-0.001% (0.1-1g / 100kg material)
Excellent high temperature resistance: It is one of the fluorescent brighteners with the best heat resistance among all current fluorescent brightener products. With a melting point of 350-355°C and being able to withstand a high temperature of 375°C, it can adapt to the high-temperature environment in most plastic processing processes. For plastic products that require high-temperature production, such as rigid PVC, ABS, EVA, polystyrene, polycarbonate, etc., the whitening effect is significant.
High color light intensity: The color light is blue or blue-violet. The heavier the blue light of the brightener, the better the whitening effect, and the less the addition amount. Fluorescent brightener OB-1 has a considerable fluorescence intensity and can effectively neutralize the yellow light in plastic raw materials, resulting in a good whitening effect for products.
Wide application range: It has good compatibility with most polymers and can be widely used in the whitening of chemical fibers such as polyester fiber, nylon fiber, polypropylene fiber, etc., as well as the whitening and brightening of plastic products such as polypropylene plastics and various engineering plastics. It can also be used in the conventional polymerization of polyester and nylon.
High cost performance: It has a relatively low price among brighteners, and the addition amount is small, which can reduce costs for production enterprises.
Stable chemical properties: Insoluble in water, slightly soluble in ethanol, dimethylformamide, benzene, toluene, etc., and has very low solubility in other organic solvents. It is resistant to strong acids and alkalis and has good resistance to sunlight and chlorine bleaching.
Low toxicity: It can be used for whitening plastic products for food packaging and children's toys, and the potential harm to human health is relatively small.
Poor weather resistance: Under the same addition amount and temperature and humidity, the migration and precipitation amount is large, and the product is more prone to yellowing and discoloration. The long-term stability is not ideal. If there are high requirements for product stability, such as plastic products exposed outdoors for a long time, fluorescent brightener OB-1 is not suitable.
Poor dispersibility: Compared with some other fluorescent brighteners, the dispersibility of OB-1 is not good enough. In the use process, some special dispersion measures may need to be taken to ensure its uniform dispersion in the plastic matrix.
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