Aqueous Tinting Base with Alkaline pH for Contamination Protection
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Solution Overview
Problem
Existing tinting systems for interior and exterior coatings face challenges with bacterial and fungicidal contamination, pH instability, and viscosity issues, particularly when using organic biocides are restricted, and phase separation occurs upon mixing tinting pastes with tinting bases.
Innovation Solution
An aqueous tinting base with a pH range of 10.0 to 12.5, comprising a polymeric organic binder, organic and inorganic rheology modifiers, alkali metal siliconate, filler, and non-ionic wetting agents, which is free of organic preservatives and titanium dioxide, ensuring stability and compatibility with various tinting pastes without phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic biocides are used to protect against bacterial and fungicidal contamination, then protection against contamination is improved, but environmental and health restrictions worsen the acceptability of the formulation
Solution Approach 1:
The patent removes organic biocides from the formulation entirely, extracting the harmful protective agents while maintaining protection through alternative means (high pH and inorganic preservatives like zinc oxide and calcium oxide), thus eliminating environmental and health harm while preserving reliability
Solution Approach 2:
The formulation uses high pH (10.5-12.0) as a protective mechanism against contamination, changing the chemical parameter of pH to serve both as a functional property and a protective mechanism, replacing the need for organic biocides while maintaining reliability
2Reliability
If pH is raised to 11 or above to protect against contamination without organic biocides, then protection against contamination is improved, but pH stability deteriorates with swift decrease to below pH 8
Solution Approach 1:
The patent incorporates pH buffer systems and stable alkaline agents (potassium hydroxide, sodium hydroxide) that preemptively resist pH changes, cushioning against pH decrease during storage and ensuring long-term pH stability while maintaining the high pH protective environment
Solution Approach 2:
The formulation combines multiple alkaline substances (potassium hydroxide, sodium hydroxide, potassium carbonate, zinc oxide, calcium oxide) to create a composite protective system that maintains pH stability through synergistic effects, preventing pH drift while ensuring contamination protection
3Reliability
If pH is increased to about 11 to protect against contamination, then protection against contamination is improved, but viscosity stability deteriorates over sufficient time periods
Solution Approach 1:
The patent carefully controls the pH parameter within the optimal range of 10.5-12.0, avoiding excessive pH elevation that would cause viscosity instability, while still maintaining sufficient alkalinity for contamination protection, thus balancing both requirements
Solution Approach 2:
The formulation includes continuous viscosity control through stabilizing agents that maintain consistent rheological properties over time, ensuring continuous viscosity stability throughout the product shelf life while maintaining the high pH protective environment
4Adaptability or versatility
If various tinting pastes are mixed with tinting base to achieve desired colors, then color variety is improved, but phase separation occurs upon mixing
Solution Approach 1:
The patent creates a highly homogeneous tinting base formulation with compatible surfactants and dispersants that ensure uniform mixing with various tinting pastes, preventing phase separation while maintaining the ability to achieve diverse colors through paste addition
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 solution provides robust protection against bacterial and fungicidal contamination, maintains long-term pH and viscosity stability, and prevents phase separation, ensuring stable tinting strength and reduced rub-out in coatings, meeting eco-label criteria for low-emission interior paints.
Implementation Method 1
an aqueous tinting base having a pH in the range of 10,0 to 12,5, preferably in the range of 10,5 to 12,0 and more preferably in the range of 11,0 to 11,5
Implementation Method 2
f) at least one wetting agent, in particular at least one non-ionic wetting agent
Implementation Method 3
b) at least one organic rheology modifier, c) at least one inorganic rheology modifier
Data Source
AI summary
The present invention refers to an aqueous transparent tinting base having a pH of 10,0 to 12,5 and comprising a) polymeric organic binder, b) organic rheology modifier, c) inorganic rheology modifier, d) alkali metal siliconate, e) filler, f) dispersing agent, g) wetting agent and i) water, wherein said aqueous tinting base is free of titanium dioxide. The invention further refers to an aqueous colored tinting base, having a pH of 10,0 to 12,5 and comprising a) polymeric organic binder based on an aqueous polymer dispersion, b) organic rheology modifier, c) inorganic rheology modifier, d) alkali metal siliconate, e) filler, f) dispersing agent, g) wetting agent, h) pigment and i) water. The invention further refers to a kit-of-parts tinting system for adjusting the color of coating systems comprising a) a tinting base of the invention and b) one or a multitude of aqueous tinting compositions containing a pigment. The invention also addresses an aqueous coating formulation obtained by mixing components a) and b) of the kit-of-parts tinting system of the invention as well as the use of the aqueous coating formulation according of the invention for coating interior walls or ceilings.