Homogenous Polymer Mixture for Sustainable Packaging
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Solution Overview
Problem
Current packaging materials based on fossil resources lack sustainability and recyclability, and existing bioplastics often fail to match the quality and transparency of traditional plastics, posing challenges for replacing them effectively.
Innovation Solution
A homogenous polymer mixture comprising cellulose acetate propionate (CAP) and polybutylene succinate (PBS) or polypropylene succinate (PPS), processed at temperatures above 210°C, which forms a high-quality, transparent, and recyclable material suitable for various packaging applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cellulose-based materials are used to replace fossil-based plastics, then environmental sustainability is improved, but processability and economic feasibility deteriorate due to high DS requirements and processing difficulties
Solution Approach 1:
The patent changes the degree of substitution (DS) parameter of cellulose esters from traditional high DS (2.2-2.7) to low DS (1.7-2.0), which fundamentally alters the processing characteristics. This parameter change enables melt processability at lower temperatures while maintaining sustainability, resolving the contradiction between environmental benefits and manufacturing ease
Solution Approach 2:
The patent creates composite material systems by blending cellulose esters with specific biodegradable polyesters (PBS, PPS, PBAT) and compatible polymers. These composite formulations improve processability and mechanical properties while maintaining sustainability, addressing the manufacturing challenges of pure cellulose-based materials
2Illumination intensity
If transparency is improved to match consumer packaging requirements, then product appeal is enhanced, but material composition becomes more complex requiring precise blending ratios
Solution Approach 1:
The patent emphasizes creating homogeneous blends through controlled mixing processes and compatible polymer selection. By ensuring uniform distribution of components at specific ratios (e.g., 60-40 or 70-30 weight percentages), the formulation achieves consistent transparency without requiring overly complex multi-layer structures
Solution Approach 2:
The patent optimizes processing temperature parameters (specifically processing at least 210°C) to achieve proper melting and homogenization of the polymer blend. This temperature control ensures complete mixing and eliminates phase separation, resulting in transparent films with uniform appearance while maintaining manageable formulation complexity
3Object-affected harmful factors
If biodegradability is enhanced to improve environmental performance, then waste reduction is improved, but mechanical strength and durability may deteriorate
Solution Approach 1:
The patent develops composite systems combining biodegradable cellulose esters with engineering-grade biodegradable polyesters (PBS, PPS, PBAT). These composites achieve tensile strengths exceeding 20 MPa and modulus values above 300 MPa, demonstrating that enhanced biodegradability does not necessarily compromise mechanical strength when proper polymer combinations are used
Solution Approach 2:
The patent modifies the molecular weight and degree of substitution parameters of the cellulose ester components to optimize the balance between biodegradability and mechanical strength. By controlling these parameters within specific ranges, the material achieves both environmental performance and structural integrity
4Stability of the object's composition
If processing temperature is increased to at least 210°C to achieve homogenous mixing, then mixture homogeneity is improved, but energy consumption increases
Solution Approach 1:
The patent sets the processing temperature parameter at a specific threshold (at least 210°C) that is sufficient to melt and homogenize the polymer blend without excessive overheating. This optimized temperature parameter achieves complete mixing and eliminates the need for prolonged processing or rework, actually reducing total energy consumption compared to lower-temperature extended processing
Solution Approach 2:
The patent employs continuous extrusion and mixing processes that maintain steady-state temperatures throughout the processing line. This continuous operation at optimized temperature (210°C+) ensures consistent homogeneity without the energy waste associated with intermittent heating and cooling cycles, improving both mixture quality and energy efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting material exhibits superior tensile strength, rigidity, and transparency, making it a suitable replacement for traditional fossil-based packaging materials, while being environmentally friendly and economically feasible due to its ability to be processed in conventional machinery and recycled.
Implementation Method 1
processing said polymer composition at a temperature of at least 210°C
Implementation Method 2
processing said polymer composition at a temperature of at least 210°C
Data Source
Figure 1
AI summary
The present invention concerns a homogenous polymer mixture comprising a polymer composition that comprises at least one cellulose ester polymer, which is cellulose acetate propionate (CAP), and at least one other polymer selected from the group consisting of polybutylene succinate (PBS) and polypropylene succinate (PPS), wherein the total amount of said cellulose ester polymer and said at least one other polymer is at least 80 wt.% based on the total weight of the polymer composition. The invention also concerns a method and use related thereto.