Lignin Skeleton Resin for Decomposable Molded Articles
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Solution Overview
Problem
Current methods for disposing and recycling thermosetting resin molded articles are inefficient, leading to environmental issues such as landfill problems, harmful gas emissions, and high energy consumption in mechanical pulverization processes.
Innovation Solution
A resin composition containing a lignin skeleton, specifically a phenolated lignin or its derivative with reactive monomer groups, is developed. This composition allows for the creation of molded articles that are both moldable and degradable, enabling efficient recycling of valuable materials like metals and ceramics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermosetting resins are used for molded articles, then insulation properties and heat resistance are maintained, but decomposition disposal becomes difficult and environmental problems arise
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by using phenolated lignin with specific phenol-containing monomers (R1-R5 groups) to create a thermosetting resin that maintains performance while enabling decomposition. The specific structural parameters of the lignin skeleton are optimized to balance durability and degradability.
Solution Approach 2:
The invention creates a composite material system combining phenolated lignin with reactive monomer groups that provide both the structural integrity needed for insulation and heat resistance, and the chemical functionality required for controlled decomposition. This composite approach resolves the contradiction between durability and disposability.
2Loss of substance
If mechanical pulverization is used to dispose of molded articles, then material recovery is possible, but large amounts of energy are consumed and excessive noise is generated
Solution Approach 1:
The patent replaces mechanical pulverization with a chemical decomposition method. The phenolated lignin-based resin can be decomposed through chemical reactions that break down the polymer structure without requiring mechanical force, thereby eliminating the need for energy-intensive crushing equipment and reducing noise pollution.
Solution Approach 2:
The invention changes the chemical parameters of the resin to enable low-energy decomposition. By incorporating specific phenol-containing monomer structures in the lignin skeleton, the material becomes susceptible to chemical breakdown at lower energy inputs compared to conventional thermosetting resins.
3Ease of manufacture
If high temperature thermal decomposition is applied to thermosetting resin molded components, then resin decomposition is achieved, but valuable materials are oxidized
Solution Approach 1:
The patent changes the decomposition temperature parameter by designing a resin with lower decomposition activation energy. The phenolated lignin structure with specific phenol-containing monomers allows decomposition to occur at lower temperatures where oxidation of valuable materials does not occur, thus protecting embedded metals and ceramics.
Solution Approach 2:
The phenolated lignin structure acts as an intermediary that facilitates controlled decomposition. The specific chemical structure of the phenol-containing monomers creates a decomposition pathway that separates resin breakdown from oxidation reactions, allowing valuable materials to be recovered without oxidation damage.
4Ease of manufacture
If molded articles are designed for easy decomposition, then recycling becomes feasible, but insulation properties and heat resistance may be compromised
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the phenol-containing monomer composition, the lignin skeleton structure, and the crosslinking density. These parameter adjustments create a resin that achieves the difficult balance of being both easily decomposable and maintaining high insulation and heat resistance properties during service life.
Solution Approach 2:
The invention uses a composite material approach where phenolated lignin provides the decomposable matrix while reactive monomer groups contribute to structural integrity. This composite structure enables the material to exhibit both easy decomposition and high reliability properties.
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 resin composition enables the production of molded articles that can be decomposed under mild conditions, allowing for the recovery of valuable materials at low costs while maintaining insulation properties and heat resistance.
Implementation Method 1
Thermosetting resins three-dimensionally crosslinked by thermosetting reaction
Implementation Method 2
The resin composition enables the production of molded articles that can be decomposed under mild conditions
Data Source
AI summary
A resin composition including a lignin skeleton capable of producing a heat-resistant molded article and being decomposed under relatively mild conditions. The resin composition contains a lignin skeleton including, as a base component, a phenolated lignin or a derivative thereof that contains a reactive monomer group, the phenolated lignin containing a phenol-containing monomer represented by the following general formula (I):wherein R1 to R5 are each independently a monovalent group selected from H, OH, a C1 to C6 alkyl group, a C1 to C6 alkoxy group, and a C6 to C10 aryl group, or adjacent substituents among R1 to R5 form a substituted or unsubstituted aromatic ring together, at least one of R1 and R2 is a hydroxyl group, and R6 is OCH3 or H; a molded article thereof, as well as a recycling method for a molded article formed in a mold formed of the resin composition.