Benzophenone - 2, with the CAS number 131 - 55 - 5, is a high - quality chemical compound. Its molecular formula is C13H10O3, and the molecular weight is approximately 214.22 g/mol. It appears as a white to off - white crystalline powder. This product is known for its excellent stability and purity, which meets the high standards required in various industries. The melting point of Benzophenone - 2 typically ranges from 66 - 69°C, and it has a specific gravity around 1.2. It is sparingly soluble in water but shows good solubility in organic solvents such as ethanol, acetone, and benzene.
1. **Cosmetics Industry**: Benzophenone - 2 is widely used as a UV absorber in sunscreens and other skin - care products. It can effectively absorb ultraviolet rays in the UV - B and UV - A ranges, protecting the skin from sunburn, premature aging, and skin cancer. By incorporating Benzophenone - 2 into cosmetics, manufacturers can provide consumers with products that offer broad - spectrum UV protection.
2. **Plastics Industry**: In the plastics field, it serves as a light stabilizer. Plastics are often exposed to sunlight during their use, which can cause degradation, color change, and loss of mechanical properties. Benzophenone - 2 can prevent these issues by absorbing UV radiation and dissipating the energy, thus extending the service life of plastic products such as automotive parts, outdoor furniture, and plastic films.
3. **Paints and Coatings**: It is also an important additive in paints and coatings. By adding Benzophenone - 2, the coatings can maintain their color and gloss for a longer time when exposed to sunlight, improving the durability and appearance of painted surfaces on buildings, bridges, and industrial equipment.
1. **Cosmetics**: When formulating cosmetics, the recommended concentration of Benzophenone - 2 is usually between 1% - 10%, depending on the specific product and the desired level of UV protection. First, dissolve Benzophenone - 2 in a suitable organic solvent such as ethanol, then mix it thoroughly with other cosmetic ingredients at a controlled temperature, usually below 70°C to avoid degradation.
2. **Plastics**: For plastics, Benzophenone - 2 can be added during the plastic manufacturing process. It can be mixed with the plastic resin in a twin - screw extruder or other mixing equipment. The typical dosage is about 0.1% - 1% of the total weight of the plastic resin, depending on the type of plastic and the environmental conditions of its use.
3. **Paints and Coatings**: In paint and coating formulations, Benzophenone - 2 is usually added in an amount of 0.5% - 3%. It should be dispersed evenly in the paint or coating system with the help of a high - speed disperser or other mixing devices. Make sure the temperature during the mixing process is within the appropriate range to ensure the stability of the product.
1. **Cosmetics Case**: A well - known cosmetic company introduced a new sunscreen product containing Benzophenone - 2. In a market test, consumers reported a significant reduction in sunburn and skin redness after using the sunscreen. The product's sales increased by 30% within six months due to its effective UV protection, which was mainly attributed to the high - quality Benzophenone - 2 used in the formulation.
2. **Plastics Case**: An automotive parts manufacturer used Benzophenone - 2 as a light stabilizer in the production of automotive exterior parts. After outdoor exposure tests for one year, the parts showed almost no color change or cracking, while the parts without Benzophenone - 2 had obvious degradation. This improvement in product quality led to a decrease in product return rates by 20% and an increase in customer satisfaction.
3. **Paints and Coatings Case**: A paint company applied a coating with Benzophenone - 2 on a large - scale industrial building. After two years of exposure to sunlight and harsh environmental conditions, the coating still maintained its original color and gloss, while the adjacent area coated with a non - Benzophenone - 2 - containing paint had faded significantly. This successful application enhanced the company's reputation in the market and led to more large - scale projects.
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