Biodegradable Poly(3-hydroxyalkanoate) Resin Composition Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biodegradable aliphatic polyester-based resins, such as polylactic acid and poly(3-hydroxyalkanoate), face challenges in terms of physical properties like impact resistance, transparency, and molding processability, which are not adequately addressed by existing compositions.
Innovation Solution
A resin composition comprising a biodegradable poly(3-hydroxyalkanoate) copolymer, a graft copolymer obtained by graft polymerization of vinyl monomers onto rubber components, and an acrylic processing modifier, along with a filler, to enhance impact resistance, tensile properties, transparency, and processability, while also improving flexural modulus of elasticity and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable aliphatic polyester-based resins (polylactic acid, poly(3-hydroxyalkanoate)) are used to achieve carbon neutrality, then environmental benefits are improved, but impact resistance and molding processability deteriorate
Solution Approach 1:
The patent creates a composite resin system combining biodegradable aliphatic polyester (carbon-neutral base) with aromatic polyester (performance enhancer) and rubber components (impact modifier). This composite approach allows the biodegradable resin to maintain its environmental benefits while the aromatic polyester and rubber phases compensate for the deficiencies in impact resistance and processability.
Solution Approach 2:
The invention introduces rubber particles with specific glass transition temperatures and graft copolymers at controlled concentrations (5-50 parts per 100 parts biodegradable resin) to locally enhance impact resistance without compromising the overall biodegradability and carbon neutrality of the main matrix.
2Object-affected harmful factors
If biodegradable aliphatic polyester-based resins are used to achieve carbon neutrality, then environmental benefits are improved, but transparency and molding processability deteriorate
Solution Approach 1:
The patent modifies the molecular structure parameters of the biodegradable resin by incorporating copolymer units with different Tg values and by controlling the molecular weight distribution. The addition of aromatic polyester and rubber components further adjusts the rheological parameters, enabling better flow characteristics during molding while maintaining optical transparency through controlled phase distribution.
3Ease of operation
If aromatic polyester is used to enhance melt strength, then processability is improved, but carbon neutrality deteriorates
Solution Approach 1:
Instead of using pure aromatic polyester which would completely compromise carbon neutrality, the patent applies partial action by incorporating only 5-50 parts of aromatic polyester per 100 parts biodegradable resin. This limited addition is sufficient to enhance melt strength and processability while minimizing the release of fossil-based carbon dioxide, maintaining the predominantly carbon-neutral character of the biodegradable matrix.
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 composition achieves improved impact resistance, tensile properties, transparency, and processability, and further enhances flexural modulus of elasticity and heat resistance when a filler is included, contributing to carbon neutrality and effective carbon dioxide fixation.
Implementation Method 1
these biodegradable plastics are of plant origin, and absorb and fix carbon dioxide in the air. Carbon dioxide generated in combustion of these biodegradable plastics of plant origin was originally present in the air, therefore increase in carbon dioxide in the atmosphere is not caused.
Implementation Method 2
a graft copolymer obtained by graft polymerization of vinyl monomers onto rubber components
Data Source
AI summary
Disclosed is a resin composition excellent in impact resistance, tensile properties and processability such as draw down property, which is produced by using a plant-derived biodegradable polymer produced by actively fixing carbon dioxide present in the earth. A resin composition comprising (A) a specific biodegradable (3-hydroxyalkanoate) copolymer, (B) a graft copolymer and (C) an acrylic processing modifier, the graft copolymer (B) and the acrylic processing modifier (C) being contained in the composition in amounts of 0.1 to 100 parts by weight and 0.1 to 30 parts by weight, respectively, based on 100 parts by weight of the biodegradable (3-hydroxyalkanoate) copolymer (A).