Dimethyl Phthalate, with the CAS number 131 - 11 - 3, is a colorless, oily liquid with a slight, aromatic odor. It is an organic compound belonging to the phthalate family. The molecular formula of dimethyl phthalate is C₁₀H₁₀O₄, and its molecular weight is approximately 194.18 g/mol. It has a density of about 1.19 g/cm³ at 20°C, a boiling point of around 282°C, and a melting point of -2°C. Dimethyl phthalate is insoluble in water but soluble in most organic solvents such as ethanol, ether, and acetone.
Dimethyl phthalate has a wide range of applications across various industries. In the plastic industry, it is commonly used as a plasticizer. Plasticizers are added to plastics to increase their flexibility, durability, and workability. By incorporating dimethyl phthalate into plastics like polyvinyl chloride (PVC), manufacturers can produce products such as flexible pipes, cables, and vinyl flooring.
In the fragrance industry, dimethyl phthalate serves as a fixative. It helps to enhance the longevity of scents and improve the overall stability of perfumes and colognes. Additionally, it can be used in the formulation of insect repellents. Its ability to repel insects makes it a valuable ingredient in products designed to protect against mosquitoes, flies, and other pests.
When using dimethyl phthalate as a plasticizer, it should be carefully mixed with the plastic resin during the manufacturing process. The recommended dosage typically ranges from 10% to 50% by weight, depending on the desired properties of the final plastic product. It is crucial to ensure uniform dispersion to achieve consistent performance.
For fragrance applications, dimethyl phthalate should be added in small quantities during the perfume - making process. It is usually blended with other fragrance ingredients in a suitable solvent. Care should be taken to follow the appropriate safety and handling guidelines, as it may cause skin irritation in some individuals.
In the case of insect repellents, dimethyl phthalate can be formulated into lotions, sprays, or creams. When applying these products, it should be spread evenly on exposed skin, avoiding contact with eyes, mouth, and open wounds. The frequency of application depends on the level of insect activity and the duration of exposure.
Case 1: Plastic Manufacturing
A plastic pipe manufacturing company incorporated dimethyl phthalate into their PVC pipe production. By adding 25% dimethyl phthalate by weight, they were able to significantly improve the flexibility and impact resistance of the pipes. The pipes became more resistant to cracking during installation and use, resulting in a higher - quality product that met the industry standards. This led to increased customer satisfaction and a boost in market share for the company.
Case 2: Fragrance Industry
A well - known perfume brand used dimethyl phthalate as a fixative in their new perfume formulation. By adding 5% of dimethyl phthalate, they noticed a significant improvement in the longevity of the scent. Customers reported that the perfume lasted longer on their skin, and the overall aroma was more complex and well - balanced. This led to positive reviews and increased sales of the perfume.
Case 3: Insect Repellent
A camping gear company developed an insect repellent spray containing dimethyl phthalate. During a field test in a mosquito - infested area, users found that the spray provided effective protection for up to 4 hours. The product was well - received by campers and outdoor enthusiasts, and it quickly became a best - selling item in the company's product line.
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