Treated Wood Composition for Moisture-Stable Termite Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current preservation methods for cellulosic materials like wood face challenges in providing effective termite resistance and dimensional stability while avoiding the drawbacks of existing quaternary ammonium compounds, such as dissociation and increased moisture absorption.
Innovation Solution
A treated cellulosic material is developed by impregnating a cellulosic material with an olefin-carboxylic acid copolymer polymer and a quaternary ammonium compound (quat) modifying agent, using a two-step treatment protocol that enhances hydrophobicity, dimensional stability, and resistance to insects and fungi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quaternary ammonium compounds (quats) are used to treat wood, then insect and fungi resistance is improved, but the quat dissociates from the wood and causes skin/respiratory irritation and aquatic harm
Solution Approach 1:
The patent uses an acrylic polymer as an intermediary carrier that binds the quaternary ammonium compound to the wood. The polymer acts as a mediator between the quat and the wood substrate, preventing direct dissociation of the quat while maintaining its biocidal activity. This resolves the contradiction by keeping the quat bound through the polymer matrix, eliminating the harmful dissociation effect while preserving insect and fungi resistance.
Solution Approach 2:
The patent creates a composite treating agent system combining acrylic polymer and quaternary ammonium compound. This composite approach allows the polymer to provide structural stability and binding to the wood, while the embedded quat provides biocidal protection. The composite structure prevents quat dissociation while maintaining effectiveness, resolving the contradiction between reliability and harmful factors.
2Reliability
If quaternary ammonium compounds (quats) are used to treat wood, then insect and fungi resistance is improved, but wood exposed to rain picks up moisture more easily
Solution Approach 1:
The acrylic polymer serves as an intermediary layer between the quat and the wood surface. This polymer layer provides a hydrophobic barrier that prevents direct contact between rainwater and the wood, while still allowing the quat to maintain its biocidal function. The polymer mediator thus eliminates the surfactant effect that causes increased moisture uptake while preserving insect and fungi resistance.
3Adaptability or versatility
If cellulosic material absorbs water, then the material swells, but after water loss through evaporation the material shrinks causing internal stresses and deformation
Solution Approach 1:
The patent applies a hydrophobic polymer coating as a preliminary protective layer before water absorption occurs. This pre-applied barrier prevents excessive water uptake by repelling water at the surface, thus preventing the swelling-deformation-shrinking cycle. The preliminary anti-action of the hydrophobic coating counteracts the natural hygroscopic behavior of cellulosic material, maintaining dimensional stability.
4Reliability
If preservative treatments are applied to provide termite resistance, then termite resistance is improved, but high percentage weight gains are required which affect the natural appearance
Solution Approach 1:
The patent uses a thin film polymer coating that provides termite resistance without requiring large amounts of preservative material. The acrylic polymer forms a continuous protective film that binds termite-active quaternary ammonium compounds, delivering effective protection at low weight gains. This thin film approach maintains the natural appearance of the wood while providing reliable termite resistance.
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 solution significantly reduces water absorption and evaporation-induced stresses, improves termite resistance, and maintains the physical properties of wood, achieving enhanced durability and resistance to degradation.
Implementation Method 1
Pressure treatment typically allows the treating agent to penetrate throughout the porous structure of the cellulosic material
Implementation Method 2
Pressure treatment typically allows the treating agent to penetrate throughout the porous structure of the cellulosic material
Implementation Method 3
The solution significantly reduces water absorption and evaporation-induced stresses, improves termite resistance, and maintains the physical properties of wood
Data Source
AI summary
The present disclosure describes a treated cellulosic material comprising: a cellulosic material having a porous structure defining a plurality of pores, at least a portion of the pores containing a treating agent comprising: a polymer comprising an olefin-carboxylic acid copolymer; and a modifying agent comprising a quat.