EVA foaming special whitening agent KCB-2

Physical and chemical properties:
Chemical name: 1,4-bis(benzoxazol-2-yl)naphthalene
Molecular formula: C24H14N2O2 C24H14N2O2
Molecular weight: 362
Appearance: light yellow-green crystalline powder
Melting point: 210-212°C
Solubility: Insoluble in water; soluble in organic solvents
Toxicity: non-toxic, tasteless
Maximum absorption wavelength: 370 nm
Maximum fluorescence emission wavelength: 437 nm

Other features:
EVA foaming special whitening agent KCB-2 has good heat resistance and light resistance, so it is very durable under various environmental conditions. It has good chemical stability and does not react with plasticizers, foaming agents or cross-linking agents. In addition, it has good compatibility with polymer materials and will not migrate.

Product application:
1. Plastic and synthetic fiber products:
EVA foaming special whitening agent KCB-2 is an optical whitening agent with good whitening effect and can produce bright blue light color. It is particularly valued for its good heat resistance, weather resistance and chemical stability. It improves the whiteness and brightness of a variety of plastic and synthetic fiber products, including PE, PP, PVC, PS, ABS, PMMA and polyester. It can also effectively improve the appearance of colored plastic products, making them more vivid.

2. Footwear EVA Foam:
In the shoemaking industry, EVA foaming special whitening agent KCB-2 is widely used in EVA (ethylene vinyl acetate) copolymer, especially in sports shoes. It provides high brightness and a clean and crisp appearance, making it an ideal optical brightener for EVA foam products.

3. Coatings and natural paints:
KCB-2, a special whitening agent for EVA foaming, can also be used in coatings and natural paints to significantly improve the whiteness. Due to its low toxicity, it has been approved in the United States for whitening food packaging materials, making it a safe and versatile option in a variety of applications.

Usage and reference dosage:
1. Whitening method:
There are three main ways to use KCB-2, a special whitening agent for EVA foaming: dry whitening, wet whitening and masterbatch whitening.
- Dry brightening: Optical brightener powder is added directly to the plastic substrate before molding. After the mixture is fully mixed and the extruder reaches the plastic melting temperature, the mixed material is fed into the screw to be melted and then pelletized or formed.
- Wet whitening: Mix the optical brightener with a binder or plasticizer to form a uniform slurry, which is then extruded in batches with the plastic.
- Masterbatch whitening: Pre-mix optical brighteners or pigments with plastic substrates or resins, usually in a ratio of 1:10-100, depending on the desired whitening effect. The mixed materials can be used directly or extruded into masterbatch. The control of the screw of the injection molding machine is the key to ensuring uniform dispersion of the masterbatch.

2. Reference dosage:
For most plastics or resins, the recommended dosage of KCB-2, a special whitening agent for EVA foaming, is 0.01-0.03%, which is equivalent to approximately 10-30 grams per 100 kilograms of plastic raw materials. The specific dosage can be adjusted according to the desired whiteness. If UV absorbers such as titanium dioxide are added, the appropriate amount of whitening agent should be adjusted accordingly.
- PVC material: add 10-25 grams per 100 kg
- PP material: add 10-25 grams per 100 kg
- PS material: add 10-20 grams per 100 kg
- PVC material: add 10-30 grams per 100 kg
- ABS material: add 10-30 grams per 100 kg
- EVA material: add 10-30 grams per 100 kg of resin
- Transparent plastic film: add 1-10 grams per 100 kilograms of plastic raw material.

Packaging and storage:
KCB-2, a special whitening agent for EVA foam, is packed in a 20 kg cardboard drum lined with plastic bags. The product has a Shelf life of 24 months when stored at room temperature.