Composition for preparing biaxially oriented flat film and application

The invention provides a composition for preparing a biaxially oriented flat film and application, the composition comprises a first main raw material and a second main raw material, the first main raw material is at least one of PBAT, PBSA and PBS, and the second main raw material is PLA; the mass ratio of the first main raw material to the second main raw material is (100-0): (0-100). The film-forming property, the temperature resistance, the breaking strength, the elastic modulus and other mechanical properties of the degradable material two-way stretching flat film can be improved, and the raw material requirement of the two-way stretching degradable film for packaging is met. 本申请提供了一种用于制备双向拉伸平膜的组合物及应用，其中，所述组合物包括第一主原料和第二主原料，所述第一主原料为PBAT、PBSA、PBS中的至少一种，所述第二主原料为PLA；所述第一主原料和所述第二主原料的质量比为(100-0):(0-100)。本申请能够改善可降解材料双向拉伸平膜的成膜性、薄膜的耐温性和薄膜的断裂强度、弹性模量等机械性能，解决包装用双向拉伸可降解薄膜的原料需求。