Preservative-Free Aqueous Coating Material for Microbial Resistance
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Solution Overview
Problem
The challenge is to develop preservative-free aqueous coating materials that maintain high quality and resistance to fungal and algae infestation, while avoiding the use of conventional preservatives, which complicates industrial-scale production and requires stringent system management to prevent microorganism introduction.
Innovation Solution
An aqueous coating material comprising specific components such as N, N, N', N'-tetra-(hydroxyalkyl)hexamethylenediamine, alkali metal alkylsilane triolate, amino alcohols, and alkylphosphonic acids, which effectively inhibits microbial growth without the need for traditional preservatives, ensuring the material's stability and resistance to bacterial and fungal attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional preservatives are used in aqueous coating materials, then microbial growth is inhibited, but the production process becomes more complex and requires stringent system management
Solution Approach 1:
The patent removes conventional preservatives from the coating material formulation entirely. Instead of using traditional biocidal agents, the invention relies on the inherent stability of the aqueous dispersion system combined with specific pH ranges (7-12) and controlled water activity to prevent microbial growth without requiring additional preservative chemicals or complex production management systems.
Solution Approach 2:
The coating material formulation itself provides protection against microbial growth through its composition. The patent describes how the specific combination of binders, pigments, fillers, and pH control creates an environment that is inherently resistant to bacterial and fungal infestation, eliminating the need for separate preservative systems and simplifying production requirements.
2Ease of manufacture
If preservatives are completely removed from aqueous coating materials, then production and storage become simpler, but the material becomes susceptible to bacterial and fungal infestation
Solution Approach 1:
The patent controls the pH of the aqueous coating material within specific ranges (7-12, preferably 8-11) to create conditions unfavorable for microbial growth. This parameter adjustment, combined with controlling water activity through the binder and additive system, provides microbial resistance without requiring preservatives, thus maintaining both production simplicity and protection against infestation.
Solution Approach 2:
The invention uses a composite aqueous dispersion system combining specific binders (acrylic, vinyl, styrene-based polymers), pigments, fillers, and functional additives that work together to create a formulation inherently resistant to microbial growth. This composite approach provides protection through the synergistic interaction of components rather than relying on separate preservative agents.
3Object-affected harmful factors
If high pH values are used in preservative-free coating materials, then microbial growth is suppressed, but product stability and resistance to degradation become challenging to maintain
Solution Approach 1:
The patent optimizes the pH range to 7-12 (preferably 8-11) to achieve microbial suppression while maintaining formulation stability. This specific pH window is carefully selected to create an alkaline environment unfavorable for microbes while remaining compatible with the binder system, pigments, and functional additives, thus preventing both microbial growth and chemical degradation.
Solution Approach 2:
The patent employs pH buffers and stable alkaline systems that maintain consistent pH levels throughout the product shelf life. This continuous pH control ensures sustained microbial suppression and prevents pH fluctuations that could lead to binder hydrolysis, pigment precipitation, or additive degradation, thereby maintaining overall product stability.
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 allows for the production of coating materials that are resistant to bacterial and fungal attacks, maintaining product integrity and preventing discoloration, odor formation, and viscosity changes, even at high pH values, thus enabling preservative-free industrial-scale production and storage.
Implementation Method 1
N, N, N’, N’’-Tetra-(hydroxyalkyl)hexamethylenediamine or d2) alkali alkyl silane triolate, preferably potassium alkyl silane triolate, particularly preferably potassium methyl silane triolate, and N, N, N’, N’’-tetra-(hydroxyalkyl)hexamethylenediamine, preferably N, N, N’, N’’-tetra-(2-hydroxypropyl)hexamethylenediamine
Implementation Method 2
d2) alkali alkyl silane triolate, preferably potassium alkyl silane triolate, particularly preferably potassium methyl silane triolate
Implementation Method 3
d3) at least one amino alcohol, preferably 2-amino-2-ethyl-1,3-propanediol and/or 2-amino-2-methyl-1-propanol, particularly preferably 2-amino-2-ethyl-1,3-propanediol, and/or alkali and/or alkaline earth hydroxide, in particular potassium and/or sodium hydroxide
Data Source
AI summary
The present invention relates to an aqueous coating material comprising a) a binder, b) a filler, c) a rheology additive, and d) a compound, e.g., N,N,N',N'-tetra-(2-hydroxypropyl)hexamethylenediamine, or a combination of compounds, e.g., an N,N-bis-(2-hydroxypropyl)-N,N,N,N-tetramethyl-1,6-hexanediammonium salt and potassium methylsilane triate, which enhances the resistance of the coating material to bacterial and/or mold infestation during production and storage. The invention further relates to a coating obtained by applying the coating material according to the invention once or several times to a substrate surface, and to a coated substrate obtained by treating a substrate with the aqueous coating material according to the invention.Furthermore, the invention relates to the use of the coating material according to the invention for the production of or as dispersion interior paint, dispersion exterior paint, filler, varnishes, glaze, construction adhesive, reinforcing compound, primer, plaster or color paste.