Lignin-Phenol Resin System for Decorative Laminates
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Solution Overview
Problem
Current methods for producing decorative high pressure laminates rely on petrochemical-based materials, and there is a need to replace these with renewable resources while effectively utilizing lignin, which poses challenges in adjusting viscosities and reactivities due to its high molecular weight and limited methylol functions.
Innovation Solution
A multi-part resin system is developed by forming a lignin-formaldehyde resin and a phenol-formaldehyde resin, specifically a resol type, which are mixed and diluted with methanol to create a homogeneous blend that can be easily adjusted for pH and viscosity, allowing for efficient impregnation of core papers and formation of decorative laminates through heat and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lignin is used to replace petrochemical-based materials in decorative laminates, then renewable resource utilization is improved, but viscosity adjustment and reactivity control become more difficult due to high molecular weight and limited methylol functions
Solution Approach 1:
The invention divides the single lignin component into a multi-part resin system consisting of lignin-formaldehyde resin combined with phenol-formaldehyde resin (resol type). This segmentation allows each component to contribute different properties: lignin provides renewable content while phenol-formaldehyde resin provides ease of viscosity and reactivity control, thereby resolving the manufacturing difficulty while maintaining renewable resource utilization.
Solution Approach 2:
The invention creates a composite resin system by combining lignin-formaldehyde resin with phenol-formaldehyde resin in specific ratios. This composite approach leverages the advantages of both materials: the renewable aspect of lignin and the processability of phenol-formaldehyde resin, thus improving ease of manufacture while maintaining adaptability to renewable resources.
2Ease of manufacture
If phenol-formaldehyde resin is used in high pressure laminates, then manufacturing process is simplified, but free phenol content increases which requires minimization
Solution Approach 1:
The invention modifies the phenol-formaldehyde resin parameters by combining it with lignin-formaldehyde resin in a multi-part system. This changes the chemical composition parameters such that the total phenol content is reduced while maintaining the manufacturing advantages of phenol-formaldehyde resin, thereby minimizing free phenol content while preserving ease of manufacture.
Solution Approach 2:
The lignin-formaldehyde resin acts as an intermediary that reduces the harmful free phenol content while allowing the phenol-formaldehyde resin to continue providing manufacturing benefits. The lignin component mediates between the need for easy manufacturing and the need to minimize harmful phenol content.
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
This approach simplifies the production process, allows for easier adjustment of resin characteristics, reduces the need for phenol, and results in a high-quality decorative laminate with enhanced properties, meeting EN 438 standards while minimizing free phenol content.
Implementation Method 1
a lignin which has been crafted by formaldehyde to create methylol chemical functions leading to a thermosetting resin
Implementation Method 2
the polycondensation of the thermosetting resins leading to a homogeneous and non-porous material
Implementation Method 3
The process of forming high pressure laminates is defined as the simultaneous application of pressure and temperature to allow the flow of the impregnated resins and then the polycondensation of the thermosetting resins
Data Source
AI summary
A method for making a multi-part resin system includes forming a lignin-formaldehyde resin, forming a phenol-formaldehyde resin, and mixing the lignin-formaldehyde resin and the phenol-formaldehyde to form the multi-part resin system.