Material Analysis
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PBAT low strength
Problem Phenomenon
PBAT film products easily break in use, tensile strength is only 18MPa lower than traditional PE, thickness needs to be doubled and cost rises.
Cause Analysis
PBAT molecular structure has a high proportion of flexible segments, so tensile strength is inherently low; poor crystallinity means it cannot be strengthened by crystallization; filler addition is limited by compatibility; increased thickness raises cost.
Solution
①Blend PLA to improve strength; ②chain extender to increase molecular weight; ③filler surface modification to improve compatibility and addition amount; ④multi-layer co-extrusion structure optimization.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Blending modification is the main path for PBAT strength improvement; PLA blending is the industry standard solution; multi-layer structure balances performance and cost.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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