Preservative-Free Dispersion Paint With Alkanolamine pH Buffering
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Solution Overview
Problem
Existing dispersion paints face issues with preservative-related skin irritation, alkaline pH requiring safety precautions, storage instability, and compatibility challenges, especially in silicate and polymer-based systems.
Innovation Solution
A dispersion paint formulation comprising 0 to 25% pigment, 20 to 50% filler, 1 to 25% polymer, 0.01 to 5% alkanolamine, and 25 to 70% water, with a pH of 10 to 12, which is free of preservatives and uses alkanolamine to stabilize the components, ensuring compatibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preservatives are added to emulsion paints to ensure storage stability, then storage stability is improved, but skin irritation and health hazards occur
Solution Approach 1:
The patent removes preservatives from the paint formulation entirely and replaces them with an alkaline buffer system (alkanolamine and/or alkaline earth metal hydroxide) that stabilizes pH without requiring biocidal agents, thereby eliminating skin irritation while maintaining storage stability
Solution Approach 2:
The patent changes the pH management approach from relying on preservatives to using an alkaline buffer system that maintains pH between 8.5 and 12, fundamentally altering how storage stability is achieved without harmful chemicals
2Reliability
If water glass is added to emulsion paints to eliminate preservatives, then storage stability without preservatives is achieved, but processability deteriorates
Solution Approach 1:
The patent extracts water glass from the formulation and replaces it with organic alkaline substances (alkanolamine and/or alkaline earth metal hydroxide) that provide pH stabilization without the negative effects on processability, achieving preservative-free storage stability while maintaining ease of application
Solution Approach 2:
The patent introduces alkanolamine and/or alkaline earth metal hydroxide as intermediary substances that mediate between the need for storage stability and the need for good processability, providing pH buffering without the drawbacks of water glass
3Reliability
If alkyl siliconates are used to stabilize emulsion paints, then storage stability is improved, but yellowing and formation of white potassium carbonate occur
Solution Approach 1:
The patent removes alkyl siliconates from the formulation and replaces them with alkanolamine and/or alkaline earth metal hydroxide, eliminating the chemical reactions that cause yellowing and white potassium carbonate formation while maintaining storage stability
Solution Approach 2:
The patent uses simpler, more stable alkaline buffer systems that do not undergo the complex reactions associated with alkyl siliconates, avoiding long-term degradation issues like yellowing and carbonate formation
4Reliability
If the pH of emulsion paint is increased to eliminate preservatives, then preservative requirement is reduced, but processability deteriorates
Solution Approach 1:
The patent optimizes the pH range to 8.5-12 and uses alkaline buffer systems that maintain this pH without the negative effects of water glass, achieving preservative-free storage stability while preserving processability through careful parameter control
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 formulation achieves homogeneous coatings with long open time, easy processing, and stable pH over several weeks without preservatives, improving workability and storage stability.
Implementation Method 1
0.01 to 5 wt.% alkanolamine, which acts as a pH buffer to stabilize the paint and eliminate the need for preservatives
Data Source
AI summary
A dispersion paint containing, based on the total weight of the dispersion paint, a) 0 to 25 wt.% pigment, b) 20 to 50 wt.% filler, c) 1 to 25 wt.% polymer, d) 0.01 to 5 wt.% alkanolamine, e) 25 to 70 wt.% water, is presented and described, with a pH value of 10 to 12. A manufacturing process for the dispersion paint is also described. The dispersion paint is suitable for interior and/or exterior use.