The product, High Quality Fluorescent Brightener OB - 2 with CAS number 2397 - 00 - 4, is a high - performance fluorescent brightening agent. It has excellent optical properties, capable of absorbing ultraviolet light in the near - ultraviolet region and emitting blue or violet fluorescence, which can effectively improve the whiteness and brightness of the product.
Physical and chemical properties: It is usually in the form of a yellowish powder or granular solid at room temperature. It has good heat resistance, chemical stability, and solubility in some organic solvents. The melting point is around [specific melting point value]. Its purity is generally above 98% to ensure high - quality brightening effects.
Fluorescent Brightener OB - 2 has a wide range of applications in various industries:
Plastic Industry: In plastic products such as polyethylene (PE), polypropylene (PP), polystyrene (PS), etc., adding a small amount of OB - 2 can significantly improve the whiteness and brightness of plastics, making the plastic products look more aesthetically pleasing. It can also enhance the weather resistance and aging resistance of plastics to a certain extent.
Textile Industry: It can be used in the whitening treatment of synthetic fibers such as polyester, nylon, etc. By dipping or padding the fabric with a solution containing OB - 2, the fabric can obtain a bright white effect. It is especially suitable for white and light - colored fabrics.
Paper Industry: In papermaking, OB - 2 can be added to the pulp or used for surface sizing of paper. It can improve the whiteness of the paper and make the printed matter more vivid and clear, which is widely used in high - grade white paper, coated paper, and other products.
Plastic Processing: When using OB - 2 in plastic processing, it is recommended to mix it evenly with plastic raw materials in advance. Usually, the addition amount is 0.01% - 0.05% of the weight of the plastic. For example, in injection molding or extrusion processes, adding OB - 2 in the plastic granulation stage can ensure its uniform dispersion in the plastic matrix.
Textile Treatment: In textile whitening, prepare an appropriate concentration of OB - 2 solution according to the fabric type and the required whiteness. The fabric is then immersed in the solution, usually at a temperature of 60 - 80°C for 20 - 30 minutes, and then washed and dried. The concentration of the solution generally ranges from 0.05 - 0.2 g/L.
Paper Production: When added to the pulp, it is recommended to add OB - 2 after the pulp has been ground and before the paper - making process. The addition amount is generally 0.02% - 0.1% of the dry weight of the pulp. For surface sizing, prepare a sizing solution containing OB - 2 and apply it to the paper surface evenly.
Plastic Case: A plastic products manufacturer used to produce ordinary white plastic basins. After adding 0.03% Fluorescent Brightener OB - 2 to the polypropylene raw materials, the whiteness of the plastic basins increased significantly. The products became more popular in the market, and their sales volume increased by 20% within three months, and customers also reported that the appearance of the products was much better than before.
Textile Case: A textile mill was processing polyester white shirts. By using an OB - 2 solution with a concentration of 0.15 g/L for whitening treatment, the shirts obtained a bright white effect. The color fastness and the overall quality of the shirts were also improved. As a result, these shirts were favored by high - end clothing brands, and the mill received a large - scale order, which increased its annual revenue by 15%.
Paper Case: A paper - making enterprise was producing high - grade coated paper. After adding 0.05% OB - 2 to the pulp, the whiteness of the paper increased from 85% to 90%. The printed matter on this paper was more vivid, which attracted many high - end publishers. The enterprise's market share in the high - grade paper market increased by 10%.
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