Siloxane Coating Reduces Wood Grain Puffing

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Solution Overview

Problem

Current methods for reducing grain puffing in wood substrates, such as using solvent-based sealers or expensive cationic waterborne paints, either result in VOC contamination or inadequate performance, highlighting a need for an effective and environmentally friendly solution.

Innovation Solution

Applying an aqueous dispersion of siloxane with balanced hydrophobic and hydrophilic groups and a particle size of 5 to 100 nm as an anti-grain puffing coating directly on the wood substrate, which enhances adhesion and reduces grain puffing without impairing barrier properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solvent-based wood sealer is used to reduce grain puffing, then grain puffing resistance is improved, but VOC contamination increases

Engineering Contradiction:

Improvegrain puffing resistanceVSAvoidVOC contamination

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the sealer by using siloxane molecules with specific hydrophobic groups (R = C1-C20 alkyl or C6-C10 aryl) and hydrophilic groups (X) in controlled ratios (m:n = 0.8:1 to 1.2:1), creating a water-based formulation that achieves grain puffing resistance without VOCs. The particle size is also controlled at 5-100 nm to optimize performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite aqueous dispersion system combining siloxane molecules with both hydrophobic and hydrophilic groups in specific proportions. This composite structure allows the material to simultaneously repel water (prevent grain puffing) and mix with water-based formulations (environmentally friendly), resolving the contradiction between effectiveness and environmental safety.

Inventive Principle:

Principle #40Composite materials

2Reliability

If expensive cationic waterborne paint is used to reduce grain puffing, then grain puffing resistance is improved, but cost increases and application areas are limited

Engineering Contradiction:

Improvegrain puffing resistanceVSAvoidcost and application versatility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive specialized cationic waterborne paints with a cost-effective siloxane-based aqueous dispersion. The siloxane formulation achieves comparable or superior grain puffing resistance at lower cost and with broader application versatility, making it accessible for general woodworking applications rather than limited specialized uses.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The siloxane-based sealer is designed with universal applicability across different wood types and coating systems. The balanced hydrophobic-hydrophilic composition (m:n ratio control) and nanoscale particle size (5-100 nm) enable it to function effectively as a grain puffing inhibitor in various water-based coating applications, unlike specialized cationic paints with limited scope.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-generated harmful factors

If waterborne wood lacquer is applied directly to polished wood substrate, then environmental friendliness is improved, but grain puffing phenomenon increases

Engineering Contradiction:

Improveenvironmental pollutionVSAvoidsurface smoothness

Core Design Contradiction:

Object-generated harmful factorsVSManufacturing precision

Solution Approach 1:

The patent applies a preliminary siloxane-based aqueous sealer coating before applying the final waterborne wood lacquer. This preliminary action modifies the wood substrate surface by filling capillaries and sealing pores with the siloxane dispersion, preventing subsequent waterborne lacquer from causing grain puffing while maintaining environmental friendliness throughout the process.

Inventive Principle:

Principle #10Preliminary action

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 siloxane coating significantly reduces or eliminates grain puffing, achieving a smoother surface with improved adhesion and barrier properties, comparable to solvent-based systems while being environmentally friendly and cost-effective.

Implementation Method 1

the siloxane contains one or more hydrophobic groups and one or more hydrophilic groups chemically bonded to its molecule skeleton

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Implementation Method 2

water easily penetrates into capillaries of the substrate, causing the capillaries to swell

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentEP3568445B1Use of aqueous dispersion of siloxane for reducing grain puffing of wood substrate and article comprising Anti-grain puffing coating

Publication Date: 2023.10.04 SWIMC LLC

AI summary

The present disclosure relates to use of an aqueous dispersion of siloxane for reducing grain puffing of a wood substrate and an article comprising an antt grain puffing coating. The article comprises (a) a wood substrate having at least one major surface; (b) an anti grain puffing coating directly applied on the major surface of the wood substrate, formed from an aqueous dispersion of siloxane; and (c) one or more coatings applied on the anti grain puffing coating, formed front an aqueous coating composition, wherein the siloxane contains one or snore hydrophobic group and one or more hydrophilic group chemically bonded to its molecule skeleton; and wherein the. siloxane has a particle size in the range of 5 to 100 nrrs.