Dioctyl terephthalate (DOTP), with the CAS number 6422-86-2, is a high - quality plasticizer. It is a colorless, odorless, and transparent oily liquid. Chemically, it has a molecular formula of C₂₄H₃₈O₄ and a molecular weight of approximately 390.56 g/mol. It has good heat resistance, light resistance, and electrical insulation properties. The density of DOTP is around 0.985 - 0.992 g/cm³ at 25°C, and its boiling point is about 383°C. It is insoluble in water but soluble in most organic solvents such as ethanol, ether, and benzene.
DOTP is widely used in various industries. In the plastic industry, it is a primary plasticizer for polyvinyl chloride (PVC) products. It can significantly improve the flexibility, processability, and durability of PVC products. For example, in the production of PVC cables, DOTP helps to enhance the electrical insulation properties and mechanical strength of the cables, making them more suitable for long - term use in different environments. In the production of artificial leather and floor coverings, DOTP gives these products good softness and elasticity, as well as resistance to wear and tear.
It is also used in the rubber industry to improve the plasticity and processing performance of rubber compounds. In addition, DOTP has applications in the paint and coating industry. It can be used as a solvent and plasticizer in some coatings to improve the film - forming properties and gloss of the coatings.
When using DOTP, the first step is to ensure proper mixing with the base material. In PVC processing, for example, DOTP should be uniformly dispersed in the PVC resin during the mixing process. This can be achieved by using appropriate mixing equipment such as high - speed mixers. The amount of DOTP added depends on the desired properties of the final product. Generally, the addition ratio ranges from 20% to 60% by weight, depending on factors such as the softness requirements and processing conditions of the PVC product.
During the processing, the temperature and time need to be carefully controlled. For PVC extrusion or injection molding processes, the processing temperature is usually between 160°C and 200°C. If the temperature is too low, the mixing may not be uniform; if the temperature is too high, it may cause decomposition of DOTP and affect the product quality.
Case 1: PVC Cable Production
A cable manufacturing company used DOTP as a plasticizer in its PVC cable production. Before using DOTP, the cables had relatively poor electrical insulation properties and were prone to cracking during bending. After switching to DOTP, the insulation resistance of the cables increased by 30%, and the bending test showed that the cables could withstand more than 10,000 bends without cracking. This not only improved the quality of the cables but also extended their service life, making the company more competitive in the market.
Case 2: Artificial Leather Manufacturing
An artificial leather manufacturer replaced the traditional plasticizer with DOTP. The new artificial leather products had better softness and elasticity, similar to real leather. The surface of the artificial leather became smoother, and the color fastness improved. As a result, the company's product sales increased by 20% within a year, and they received more positive feedback from customers.
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