| 摘要 |
The present descriptive report refers to a patent of invention of PVC plasticizers composed of epoxidized bioesters of vegetable oil fatty acids obtained by partial transesterification with ethanol and glycerin and further acetylation and epoxidation, and PVC compounds plasticized with bioesters resulting from partial transesterification, acetylation and epoxidation, belonging to the technical field of polymer additives that were developed to improve the properties of PVC polymers, in addition to providing a lower cost for renewable compounds, such as those obtained with the use of vegetable oils. The epoxidized bioesters of the present invention are composed by mixtures of epoxidized ethyl esters and acetylated and epoxidized mono, di and triglyceril esters, presenting oxirane index equal to or less than 8. These primary plasticizers provide improvements to the properties of the compounded PVC not foreseen in the state of the art, such as better physical properties at low temperatures, greater flexibility of the final compound, higher mixing efficiency of the resin, improved resistance to aliphatic solvents extraction and improved resistance to UV degradation. |
