Polyurethane Wood Preservative Composition With Lower Toxicity
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Solution Overview
Problem
Existing wood preservatives, such as those containing pentachlorophenol or creosote, pose environmental toxicity and pollution concerns, necessitating a more environmentally friendly alternative for wood treatment.
Innovation Solution
A wood preservation composition comprising a polyurethane polymer synthesized from a polyol with >95% p-propylene oxide, an isocyanate, and a capping agent, combined with organic solvents and wood preservative actives like halogenated isothiazolone biocides, halogenated carbamate fungicides, and azole fungicides, using compatible capping agents with alkyl chains ≥C5 and secondary amines ≥C14, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional oil-based preservatives (pentachlorophenol, creosote) are used, then effective wood protection is achieved, but environmental toxicity and pollution increase
Solution Approach 1:
The invention changes the chemical composition parameters by using polyurethane polymers synthesized from >95% p-propylene oxide polyol with specific molecular weight (2000) and specific capping agents (mono alcohol ≥C5 or secondary amine ≥C14), replacing traditional toxic preservatives while maintaining protective effectiveness
Solution Approach 2:
The invention creates a composite wood preservation system combining polyurethane polymer, organic solvent, and wood preservative actives (halogenated isothiazolone biocides, halogenated carbamate fungicides, azole fungicides) to achieve both environmental friendliness and effective protection
2Object-affected harmful factors
If environmentally friendly preservatives are used, then environmental impact is reduced, but wood protection effectiveness may be compromised
Solution Approach 1:
The invention optimizes the polyurethane polymer parameters including polyol composition (>95% p-propylene oxide), molecular weight (2000), and capping agent selection to achieve the right balance between environmental compatibility and preservative effectiveness
Solution Approach 2:
The invention uses a composite formulation combining environmentally friendly polyurethane polymer with specific wood preservative actives (halogenated isothiazolone biocides, halogenated carbamate fungicides, azole fungicides) to ensure both environmental friendliness and protective effectiveness
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 composition provides effective wood protection against decay while minimizing environmental impact, ensuring long-term preservation and compatibility with organic solvents.
Implementation Method 1
a polyurethane polymer synthesized from a polyol comprising >95% p-propylene oxide; an isocyanate, and a capping agent
Data Source
AI summary
A wood preservative composition and method for preserving wood by contacting wood with said composition comprising a polyurethane polymer, non-aqueous solvents, and a wood preservative active.