Poly(meth)acrylate Treated Cellulosic Material for Dimensional Stability
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Solution Overview
Problem
Current preservation methods for cellulosic materials like wood fail to adequately address termite resistance and dimensional stability, leading to issues such as splitting, warping, and degradation due to water absorption and insect damage.
Innovation Solution
A treated cellulosic material is developed by impregnating a cellulosic material with an aqueous dispersion containing a poly(meth)acrylate polymer, which enhances hydrophobicity, dimensional stability, and resistance to insects, fungi, and mold, using a method that includes pressure treatment and optional modifying agents to improve penetration and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure treatment with chemical compounds is used to preserve cellulosic material, then water resistance and dimensional stability are improved, but the material becomes susceptible to internal stresses, splitting, and warping due to non-uniform water absorption
Solution Approach 1:
The patent changes the chemical composition parameters by introducing poly(meth)acrylate polymer with specific molecular weight ranges (10,000-1,000,000 g/mol) and controlled glass transition temperatures (-50°C to 0°C), which fundamentally alters how the material interacts with water, providing both water resistance and dimensional stability simultaneously
Solution Approach 2:
The patent creates a composite system by combining poly(meth)acrylate polymer with cellulosic material, where the polymer forms a protective network within the porous structure that modifies water absorption behavior and provides both waterproofing and dimensional stability without the harmful effects of conventional chemical treatments
2Object-affected harmful factors
If conventional preservative treatments are applied to provide termite resistance, then insect damage is reduced, but the treatment requires high percentage weight gains and provides limited durability
Solution Approach 1:
The patent employs a polymer that can be applied in small amounts (low weight gain) and provides long-lasting protection. The poly(meth)acrylate polymer forms a durable protective layer that maintains termite resistance over time without requiring high concentrations or frequent reapplication, effectively replacing the need for heavy-duty, short-lived conventional preservatives
3Stability of the object's composition
If water absorption is increased to improve dimensional stability, then the material becomes more resistant to splitting and warping, but water serves as a pathway for organisms that degrade the cellulosic material
Solution Approach 1:
The patent converts the harmful effect of water absorption into a beneficial one by using poly(meth)acrylate polymer to create a hydrophobic protective network. This network allows the material to maintain dimensional stability while simultaneously preventing water from penetrating deep enough to serve as a pathway for biodegrading organisms, effectively turning water absorption into a protective mechanism
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 treated cellulosic material exhibits significant reduction in water absorption, improved dimensional stability, and enhanced resistance to insects and fungi, as demonstrated by reduced swelling and increased hardness, effectively addressing the limitations of existing preservation methods.
Implementation Method 1
Pressure treatment typically allows the treating agent to penetrate throughout the porous structure of the cellulosic material
Implementation Method 2
The treating agent is typically a chemical compound selected to impart the desired physical properties to the cellulosic material
Implementation Method 3
The treated cellulosic material exhibits significant reduction in water absorption, improved dimensional stability
Implementation Method 4
Porous materials, such as cellulosic materials, need to be protected from mold growth, insect attack, rot and water impregnation
Data Source
AI summary
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 a poly(meth)acrylate polymer. The present further describes a method for preparing a treated cellulosic material comprising (a) providing a cellulosic material; and (b) a first treatment protocol comprising impregnating the cellulosic material with an aqueous dispersion comprising a polymer, the polymer comprising a poly(meth)acrylate polymer.