Lignocellulose Composite Production via Free Radical Precursor
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Solution Overview
Problem
Conventional lignocellulose composite products made with formaldehyde-based resins face challenges such as formaldehyde emission, which leads to environmental concerns and compromises product strength, moisture resistance, and processing tolerance.
Innovation Solution
A method involving the combination of lignocellulose substrates with a free radical precursor and a polyphenolic material, where the mixture is heated to produce a composite product with reduced formaldehyde emission, maintaining at least 11 wt % of the free radical precursor and controlling temperature to achieve desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde based resins are used as binders, then product strength is improved, but formaldehyde emission increases causing environmental concerns
Solution Approach 1:
The patent extracts and eliminates formaldehyde from the binder system by replacing formaldehyde-based resins with alternative binders such as polymeric adhesives, waxes, and oils that do not contain formaldehyde, thereby maintaining product strength while eliminating formaldehyde emission
Solution Approach 2:
The patent changes the chemical composition parameters of the binder by using different types of adhesives (polymeric adhesives, waxes, oils) with varying molecular weights and chemical structures to achieve the desired balance between bond strength and formaldehyde emission reduction
2Object-generated harmful factors
If formaldehyde scavengers are added to reduce formaldehyde emission, then formaldehyde emission is reduced, but product strength and moisture resistance deteriorate
Solution Approach 1:
Instead of adding formaldehyde scavengers to existing formaldehyde-based resins, the patent extracts formaldehyde from the system entirely by using alternative binder compositions that do not rely on formaldehyde chemistry, thus avoiding the strength degradation caused by scavenger addition
3Object-generated harmful factors
If formaldehyde scavengers are added to reduce formaldehyde emission, then formaldehyde emission is reduced, but resin shelf-life and processing tolerance are reduced
Solution Approach 1:
The patent removes formaldehyde from the binder system entirely, eliminating the need for formaldehyde scavengers and their associated negative effects on resin shelf-life and processing tolerance, while using alternative binders that maintain stable chemical 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 method results in composite products with improved internal bond strength and reduced formaldehyde emission, addressing environmental concerns while maintaining product integrity.
Implementation Method 1
heating the mixture comprising at least 11 wt % of the free radical precursors charged to the mixture to a temperature of at least 60° C. to about 300° C. to produce a composite product
Implementation Method 2
maintaining the mixture at a temperature of less than 60° C. for at least 10 minutes while retaining at least 11 wt % of the free radical precursor charged to the mixture
Data Source
AI summary
Methods for making composite products are provided. In at least one specific embodiment, the method can include combining a plurality of lignocellulose substrates, a free radical precursor, and a polyphenolic material to produce a mixture. The polyphenolic material can be in a liquid form, a solid form, or both when combined to produce the mixture. The method can also include maintaining the mixture at a temperature of less than 60° C. for at least 10 minutes while retaining at least 11 wt % of the free radical precursor charged to the mixture. The mixture can also include heating the mixture comprising at least 11 wt % of the free radical precursors charged to the mixture to a temperature of at least 60° C. to about 300° C. to produce a composite product.