Biodegradable Net Using PHA and PBSA Composite

The patent changes the chemical composition parameters by using PHA as the base polymer and controlling the ratio of PBSA (5-50 parts by weight) to achieve optimal balance between mechanical strength and biodegradability. This parameter optimization allows the net to maintain required mechanical properties while being fully biodegradable within 90 days, resolving the contradiction between strength and environmental harm.

The patent creates a composite polymeric material combining PHA with PBSA in specific proportions. This composite structure leverages the biodegradability of PHA and the mechanical enhancement of PBSA, achieving a material that simultaneously provides high mechanical properties and complete biodegradability, thus eliminating environmental pollution while maintaining strength.

The patent optimizes the compositional parameters by limiting PBSA content to 5-50 parts by weight per 100 parts PHA and carefully selecting plasticizer and nucleant types and quantities. This parameter control ensures that mechanical properties are enhanced without compromising the biodegradability timeline, maintaining complete degradation within 90 days while achieving required strength.

The patent applies different functional additives at specific locations and concentrations within the polymer matrix. Plasticizers are added in controlled amounts (1-20 phr) to provide localized flexibility, while nucleants (0.1-5 phr) are distributed to enhance crystallinity and strength. This localized quality approach ensures mechanical enhancement without widespread compromise of biodegradability.

The patent develops a composite material system where PHA (50-95 parts by weight) provides the biodegradable matrix and PBSA (5-50 parts by weight) reinforces the mechanical structure. This composite formulation achieves synergistic effects where the biodegradability of PHA is preserved while PBSA enhances tensile strength and elasticity, resolving the contradiction between environmental friendliness and mechanical performance.

The patent uses plasticizers as intermediary substances that mediate between the rigid PHA matrix and the mechanical requirements. The plasticizer molecules insert themselves between polymer chains, providing flexibility and improving elongation without compromising the biodegradability of the PHA-based system, thus enabling biodegradable nets to achieve adequate mechanical properties.