Core-Shell Coating Composition for Stain Resistance
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Solution Overview
Problem
Existing compositions for coating substrates to prevent soil and stain accumulation often face challenges such as environmental concerns due to volatile organic solvents, complex application processes, and inadequate shelf-life, while also requiring a tradeoff between performance, environmental friendliness, and ease of use.
Innovation Solution
A composition comprising an aqueous continuous liquid phase with core-shell particles, where a polymer core is surrounded by nonporous spherical silica particles, and a pH value of less than 5, which provides long-lasting protection from staining minerals and soap deposits without volatile organic solvents and is easy to apply, with a method involving the combination of alkaline dispersions and acidification to create the core-shell particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If volatile organic solvents are used in coating compositions, then the composition can provide protective layers with desirable properties, but environmental issues arise
Solution Approach 1:
The patent changes the chemical composition parameters by replacing volatile organic solvents with water as the continuous liquid phase, and adjusting the pH to less than 5 to stabilize the core-shell particles. This parameter change eliminates environmental harm while maintaining protective layer performance through the engineered core-shell structure of polymer cores with silica shells.
2Reliability
If complex application processes are used, then desired performance attributes can be achieved, but ease of use by unskilled users deteriorates
Solution Approach 1:
The composition is formulated to be self-stabilizing at low pH, eliminating the need for complex application procedures. The core-shell structure and acidic pH condition prevent particle aggregation and maintain stability during storage and application, allowing unskilled users to apply the coating without specialized knowledge or equipment.
3Stability of the object's composition
If compositions are formulated for long shelf-life, then stability is improved, but performance attributes may be compromised
Solution Approach 1:
The patent uses parameter changes by maintaining the composition at a pH of less than 5, which stabilizes the core-shell particle structure during storage. The acidic environment prevents particle aggregation and degradation, ensuring both long shelf-life and consistent performance attributes when applied. The low pH is maintained throughout storage and application.
4Object-affected harmful factors
If environmentally friendly materials are used, then environmental friendliness is improved, but satisfactory shelf-life deteriorates
Solution Approach 1:
The patent uses composite materials by creating core-shell particles with polymer cores and silica shells, dispersed in an aqueous continuous phase at low pH. This composite structure provides environmental friendliness through water-based formulation while the acidic pH and core-shell architecture ensure long shelf-life by preventing particle aggregation and degradation.
5Reliability
If core-shell particles with nonporous spherical silica are used, then protection from staining minerals and soap deposits is improved, but formulation complexity increases
Solution Approach 1:
The patent uses parameter changes by controlling the pH at less than 5 and using nonporous spherical silica particles with specific size ranges (60 nm or less). These parameter specifications simplify the formulation approach while achieving superior protection from stains and deposits through the engineered core-shell structure and acidic stabilization.
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 offers extended shelf stability, easy application, and effective protection against stains and soap deposits on hard surfaces, such as bathroom fixtures and windows, while being environmentally friendly and suitable for use by unskilled users.
Implementation Method 1
core-shell particles, each core-shell particle comprising a polymer core surrounded by a shell consisting essentially of nonporous spherical silica particles disposed on the polymer core
Implementation Method 2
gradually acidifying the alkaline dispersion such that a major portion of the polymer particles are converted to core-shell particles
Data Source
Figure 1~2
AI summary
Compositions include an aqueous continuous liquid phase and core-shell particles dispersed in the aqueous continuous liquid phase. Each core-shell particle includes a polymer core surrounded by a shell consisting essentially of nonporous spherical silica particles disposed on the polymer core, wherein the nonporous spherical silica particles have a volume average particle diameter of 60 nanometers or less. Methods of making and using the compositions to coat a substrate are also disclosed.