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Physical and Chemical Properties
Chemical Name: 1,4-bis(benzoxazole-2-yl)naphthalene
Molecular Formula: 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 and odorless
Maximum Absorption Wavelength: 370 nm
Maximum Fluorescence Emission Wavelength: 437 nm
Additional Properties: Brightener KCB-2 for EVA Foam exhibits good heat and light resistance, making it highly durable under various environmental conditions. It maintains good chemical stability and does not react with plasticizers, foaming agents, or cross-linking agents. Additionally, it demonstrates good compatibility with polymer materials and does not exhibit migration phenomena.
Applications of Brightener KCB-2 for EVA Foam
1. Plastic and Synthetic Fiber Products:
Brightener KCB-2 for EVA Foam is a premium optical brightener with outstanding whitening effects, producing a vivid blue-bright color. It is particularly valued for its good heat resistance, weather resistance, and chemical stability. It enhances the whiteness and brightness of various plastic and synthetic fiber products, including PE, PP, PVC, PS, ABS, PMMA, and polyester fibers. It is also effective in improving the appearance of colored plastic products, making them more vibrant.
2. EVA Foam in Footwear:
In the footwear industry, Brightener KCB-2 for EVA Foam is extensively used in EVA (ethylene-vinyl acetate) copolymers, especially in sports shoes. Its ability to provide a high level of brightness and a clean, fresh appearance makes it an ideal optical brightener for EVA foam products.
3. Coatings and Natural Lacquers:
Brightener KCB-2 for EVA Foam is also utilized in coatings and natural lacquers, where it significantly enhances whiteness. Due to its low toxicity, it is approved for use in whitening food packaging materials in the United States, making it a versatile and safe option for various applications.
Usage Methods and Reference Dosage
1. Whitening Methods:
Brightener KCB-2 for EVA Foam can be applied through three primary methods: dry whitening, wet whitening, and masterbatch whitening.
- Dry Whitening: The optical brightener powder is directly added to the plastic base material before molding. The mixture is thoroughly blended, and once the extruder reaches the plastic melting temperature, the mixed material is fed into the screw for melting, followed by granulation or molding.
- Wet Whitening: The optical brightener is mixed with an adhesive or plasticizer to form a uniform slurry, which is then batch extruded with plastic.
- Masterbatch Whitening: The optical brightener or pigment is pre-mixed with the plastic base material or resin, typically at a ratio of 1:10-100, depending on the desired whitening effect. The mixed material can be directly used or extruded into masterbatches. Control of the injection molding machine’s screw is key to ensuring even dispersion of the masterbatch.
2. Reference Dosage:
For most plastics or resins, the recommended dosage of Brightener KCB-2 for EVA Foam ranges from 0.01-0.03%, which equates to approximately 10-30 grams per 100 kilograms of plastic raw material. The specific amount can be adjusted based on the desired level of whiteness. If UV absorbers like titanium dioxide are added, the good dosage of the brightener should be adjusted accordingly.
- PE Material: 10-25 grams per 100 kilograms
- PP Material: 10-25 grams per 100 kilograms
- PS Material: 10-20 grams per 100 kilograms
- PVC Material: 10-30 grams per 100 kilograms
- ABS Material: 10-30 grams per 100 kilograms
- EVA Material: 10-30 grams per 100 kilograms of resin
For transparent plastic films, the dosage of Brightener KCB-2 for EVA Foam is generally 1-10 grams per 100 kilograms of plastic raw material.
Packaging
Brightener KCB-2 for EVA Foam is packaged in 20-kilogram cardboard drums lined with plastic bags. The product has a shelf life of 24 months when stored at room temperature.
