Wood Treatment with Silicate Insolubilization
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Solution Overview
Problem
Current methods for using sodium silicate as a wood preservative face challenges such as high cost, energy consumption, and environmental concerns due to water solubility and leaching issues, which hinder its widespread industrial acceptance for providing termite-, fungal-, and fire-resistant properties.
Innovation Solution
A water-based formulation comprising alkali metal silicate and an insolubilization agent, such as organic acids or inorganic polyvalent ions, applied to wood with a controlled molar ratio and pH to create a stable solution that polymerizes upon drying, ensuring the silicate remains insoluble and resistant to water, thereby preventing leaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium silicate is used as a wood preservative to provide termite-, fungal-, and fire-resistant properties, then the protective performance is improved, but the water solubility causes leaching and environmental harm
Solution Approach 1:
The patent changes the chemical parameters of the silicate solution by adjusting pH and adding insolubilization agents to transform the solubility state of sodium silicate from soluble to insoluble after application, preventing leaching while maintaining protective properties
Solution Approach 2:
The patent introduces insolubilization agents (such as calcium chloride, magnesium sulfate, or inorganic acids) as intermediary substances that react with sodium silicate to form insoluble complexes, acting as mediators that convert the harmful soluble state into a beneficial insoluble state
2Reliability
If high temperature drying is applied to make sodium silicate insoluble, then the leaching resistance is improved, but the energy consumption increases
Solution Approach 1:
The patent makes the insolubilization process continuous by incorporating insolubilization agents directly into the application solution, allowing the transformation from soluble to insoluble state to occur continuously during and after application without requiring separate high-temperature drying steps
Solution Approach 2:
The patent changes the approach from thermal parameter (high temperature) to chemical parameter (pH and insolubilization agents), achieving insolubilization through chemical reactions at lower temperatures, thus reducing energy consumption while maintaining leaching resistance
3Reliability
If multi-step application process is used for wood treatment, then the treatment effectiveness is improved, but the process cost and complexity increase
Solution Approach 1:
The patent merges multiple treatment steps into a single application process by combining the silicate solution with insolubilization agents in one formulation, allowing simultaneous impregnation and insolubilization in one operation, thus reducing process complexity while maintaining effectiveness
Solution Approach 2:
The patent creates a multi-functional treatment solution that simultaneously provides protection against termites, fungi, and fire while also achieving insolubilization in a single application, eliminating the need for separate treatment steps and reducing overall process complexity
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 provides durable termite-, fungal-, and fire-resistant properties to wood while minimizing environmental impact by maintaining the alkali metal silicate within the wood, even under humid or outdoor conditions, and reduces the energy required for treatment processes.
Implementation Method 1
the formulation has a long shelf life (does not gel or precipitate) but starts to polymerize when the treated wood is dried
Implementation Method 2
an insolubilization agent which is selected from an organic acid, an inorganic acid or an inorganic polyvalent ion
Data Source
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AI summary
In order to prolong the usage of wood one needs to prevent the growth of rot and fungi. The most common substances used today are not environmentally friendly and they need to be replaced by more environmentally friendly options. Water glass or sodium silicate has been known for a long time having properties which give the wood resistance to rot and fungi and in addition also fire retardant properties. The present invention discloses a method for treatment of wood to improve the flame retardant properties and also the resistance to rot, fungus, mold and insects of a wooden material. The wood treatment method of the invention comprises the steps of providing a wooden material and providing water based formulation which is stable in room temperature or in temperatures ranging from 15-35 °C. The water based formulation of the invention consist essentially ofan alkali metal silicate, water and an insolubilization agent which is selected from an organic acid, an inorganic acid or an inorganic polyvalent ion, added in an amount lower than the amount of insolubilization agent needed for the formulation to reach the gelling point. Further the wood treatment method includes the steps of applying the water based formulation on the wooden material and drying the wooden material treated with said water based formulation at any given temperature in order to remove excess of water and also curing the dried wooden material at an elevated temperature in order to insolubilize the alkali metal silicate.