Wood Paste Using Natural Binders to Eliminate Formaldehyde
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Solution Overview
Problem
Current methods for producing 3D wood objects rely on synthetic polymers containing hazardous chemicals, and there is a need for fully biodegradable, chemical-free materials for additive manufacturing.
Innovation Solution
Development of compositions using wood powder and natural binders composed of cellulose nanocrystals (CNCs) and hemicellulose, eliminating formaldehyde and synthetic resins, allowing for the creation of 100% wood 3D objects through various manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde-based resins (UF/PF) are used to produce wood composite objects, then manufacturing capability and structural integrity are improved, but hazardous chemical content and health safety deteriorate
Solution Approach 1:
The invention extracts and removes formaldehyde and other hazardous synthetic chemicals from the wood composite formulation, replacing them with natural, non-toxic alternatives such as natural resins, oils, and waxes that provide equivalent binding and protective functions without the harmful effects
Solution Approach 2:
The invention changes the chemical composition parameters from synthetic formaldehyde-based resins to natural alternatives, fundamentally altering the material system to eliminate hazardous substances while maintaining or improving structural performance through optimized natural ingredient formulations
2Ease of manufacture
If synthetic polymers and resins are used in wood objects, then ease of manufacture and structural properties are improved, but biodegradability and environmental safety deteriorate
Solution Approach 1:
Instead of using synthetic polymers that resist degradation, the invention inverts the approach by employing natural materials that are inherently biodegradable, allowing the product to return to the environment safely after use while maintaining manufacturing feasibility through modern processing techniques
3Object-affected harmful factors
If MDI is used as a formaldehyde alternative, then formaldehyde exposure is reduced, but allergen content and reactivity towards water deteriorate
Solution Approach 1:
The invention introduces natural resins, oils, and waxes as intermediary substances that mediate the binding function between wood particles without the allergenic and sensitizing properties of MDI, providing a safe alternative that is non-reactive towards water and harmless to human health
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
Enables the production of fully natural, biodegradable 3D wood objects without hazardous chemicals, offering design freedom and safe materials for crafting and manufacturing, addressing the demand for green materials in industries like furniture and construction.
Implementation Method 1
The binder is composed of CNC particles dispersed in water... After the water evaporates, the CNC serves as a binder between the wood pieces
Implementation Method 2
Once mixed with wood flour or chips, it adheres to the surface of the wood chips and after the water evaporates, the CNC serves as a binder between the wood pieces
Data Source
AI summary
The invention generally concerns methods and printing inks comprising wood chips/wood powder and plant-extracted natural binders for constructing wood 3D structures.