One-Step Floor Finish Merging Stain and Topcoat
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Solution Overview
Problem
Conventional wood-finishing processes require multiple steps, generating dust and fumes, and are time-consuming, especially when changing floor colors, which poses health risks and inefficiencies.
Innovation Solution
A single-formula floor finish comprising a water-based pigment dispersion and a topcoat formulation with drier-free polyurethane dispersion, co-solvents, metal driers, and surfactants, allowing for immediate application of a topcoat without waiting for the stain to dry and enabling color changes without sanding, while reducing VOCs and dust/fume generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional two-step wood-finishing process is used (stain followed by topcoat), then the floor receives both color and protection, but the process is time-consuming and requires waiting for the stain to dry before applying the topcoat
Solution Approach 1:
The patent combines stain and topcoat into a single integrated formulation containing pigments, binders, and protective agents. This single-step composition simultaneously provides coloration and protection, eliminating the need for separate application steps and drying waiting periods, thereby reducing total process time and improving productivity
Solution Approach 2:
The single-step floor finish composition performs multiple functions simultaneously: it stains the wood to provide color, forms a protective coating layer, and provides durability. This multi-functional approach replaces the conventional two-product system (stain plus topcoat) with one universal product that accomplishes all finishing objectives in a single application
2Adaptability or versatility
If the stain layer is removed to change floor color, then the desired color change is achieved, but excessive dust and fumes are generated posing health risks
Solution Approach 1:
The single-step composition is formulated to adhere to both bare wood and previously finished floors. When color change is desired, the new composition can be applied directly over the existing finish without sanding or removal steps, thereby preventing the generation of hazardous dust and fumes while still achieving the desired color change through the pigmented formulation
Solution Approach 2:
The patent modifies the chemical composition and adhesion properties of the floor finish to enable it to bond effectively to existing finish layers. This parameter change in adhesion capability allows the composition to be applied over cured finishes without mechanical removal, eliminating dust generation while maintaining color change versatility through pigment formulation
3Object-affected harmful factors
If a water-based polyurethane dispersion is used in the topcoat formulation, then VOC emissions are reduced complying with environmental regulations, but the formulation requires additional components to prevent lapping marks and control cure time
Solution Approach 1:
The patent introduces co-solvents as intermediary components in the water-based polyurethane dispersion formulation. These co-solvents mediate between the water-based resin and the application process, preventing lapping marks by ensuring uniform drying and film formation. Additionally, metal driers are added as catalytic intermediaries to control and accelerate the curing process, managing the complexity introduced by the water-based system
Solution Approach 2:
The formulation creates a composite water-based system combining polyurethane dispersion, co-solvents, metal driers, and surfactants. This composite approach integrates multiple functional components that work synergistically: the polyurethane provides durability and low VOC content, co-solvents prevent application defects, metal driers control cure kinetics, and surfactants ensure uniform film formation, thereby achieving environmental compliance without sacrificing performance
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
This solution simplifies the wood-finishing process, reduces time, minimizes hazardous dust and fume production, and provides durable, evenly coated floors with customizable cure times and color options, adhering to environmental regulations.
Implementation Method 1
a metal drier for adjusting the cure time within the target range
Implementation Method 2
co-solvents in an amount chosen to achieve a cure time of the finish within a target range
Implementation Method 3
a surfactant for creating a smooth and flat coating
Data Source
AI summary
A floor finish, in various embodiments, includes a water-based pigment dispersion and a topcoat formulation having (i) a drier-free water-based polyurethane dispersion, (ii) co-solvents in an amount chosen to achieve a cure time of the finish within a target range, (iii) a metal drier for adjusting the cure time within the target range, and (iv) a surfactant for creating a smooth and flat coating.