Surface-Modified Pigment System for Deep Black Concrete
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Solution Overview
Problem
Existing hydraulic binder systems, such as cement and concrete, face challenges in achieving deep black coloration without compromising strength or durability, particularly under severe weather conditions, as current pigments like iron oxide black and carbon have limitations in color intensity and long-term stability.
Innovation Solution
A multi-component preparation for coloring hydraulic binder systems, comprising surface-modified dye pigments, dispersants, and optional phase mediators, where the surface-modified pigments are reacted with alkoxysilanes to enhance compatibility and stability, forming a network that improves color homogeneity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iron oxide black pigment is used for coloring concrete, then the pigment can be integrated permanently into the cementitious system, but deep black coloring is not possible and only anthracite color is achieved
Solution Approach 1:
The invention combines carbon pigment particles with iron oxide black pigment particles to create a composite coloring system. The carbon provides deep black coloration while the iron oxide ensures permanent integration into the cementitious matrix, achieving both color depth and long-term stability that neither pigment could achieve alone.
Solution Approach 2:
The invention modifies the particle size parameters of both carbon and iron oxide pigments to optimize their performance. By controlling the D50 values within specific ranges (carbon: 1-1000 nm, iron oxide: 1-1000 nm), the system achieves improved color strength, homogeneous distribution, and permanent integration into the concrete matrix.
2Illumination intensity
If carbon pigment is used for coloring concrete, then deep black coloration is achieved, but long-term integration into the polar aqueous cementitious system is inadequate
Solution Approach 1:
The invention creates a composite system where carbon pigment particles are combined with iron oxide black pigment particles. The iron oxide component acts as a bridge, providing polar surface characteristics that enable permanent integration into the aqueous cementitious system while maintaining the deep black coloration provided by the carbon.
Solution Approach 2:
The invention optimizes the local properties of the pigment particles by controlling their size and surface characteristics. The iron oxide particles with specific size ranges (D50: 1-1000 nm) provide local polar interaction sites that anchor the otherwise non-polar carbon particles to the cementitious matrix, ensuring long-term stability.
3Illumination intensity
If high dose of iron oxide black pigment is used to achieve dark coloring, then relatively dark concrete can be obtained, but high costs are associated due to high basic price and high pigment requirement
Solution Approach 1:
The invention creates a synergistic composite system where carbon pigment and iron oxide black pigment work together. The carbon pigment provides strong coloration at low doses, allowing the iron oxide to be used in smaller quantities than would be required for iron oxide-only systems, thereby reducing overall pigment costs while achieving deep black coloration.
Solution Approach 2:
The invention changes the concentration parameters of the pigment components by optimizing the dose ratios of carbon to iron oxide. This optimized formulation achieves deep black coloration with lower total pigment content compared to conventional iron oxide-only systems, reducing material costs.
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 achieves long-lasting, homogeneous, and intense coloration with improved weather resistance, ensuring the color stability and strength of the concrete without the need for high pigment doses, thus addressing the limitations of previous methods.
Implementation Method 1
the surface-modified dye pigment is reacted with at least one modifier, the modifier being at least one alkoxysilane of the general formula R1n-Si(OR2)m
Implementation Method 2
the preparation comprises (b) 0.001 to 45% by weight, based on the preparation, of at least one dispersant
Implementation Method 3
optionally (c) at least one phase mediator wherein the dye pigment has an average particle diameter, determined as D50-Value, in the range from 1 to 1,000 nm
Data Source
AI summary
The invention relates to a preparation for coloring hydraulic binder systems, in particular cement-based systems, preferably concrete, wherein the preparation comprises the following components: (a) at least one surface-modified color pigment, (b) at least one dispersant, (c) optionally at least one phase mediator. The invention additionally relates to the production and use of said preparation.