Polysaccharide Plasticizer Additive for Low Surface Energy Adhesion
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Solution Overview
Problem
Polysaccharides, commonly used in building material compositions, fail to provide effective adhesion to difficult-to-adhere substrates with low surface energy, necessitating additional components like synthetic latex to enhance adhesion, which can lead to inefficiencies in composition formulation and increased costs.
Innovation Solution
A process to create a powdery additive comprising a solid polysaccharide and a plasticizer, where the plasticizer is liquid at 50°C or lower and has a boiling point of 100°C or higher, is used to improve adhesion to substrates with surface energies of 50 mJ/m² or lower, by admixing the plasticizer with the polysaccharide in an aqueous medium or by adsorbing/emulsifying it onto a carrier, and then mixing with the polysaccharide particles to form a stable additive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polysaccharides are used in building material compositions, then water retention and rheological properties are improved, but adhesion to difficult-to-adhere substrates is insufficient
Solution Approach 1:
The invention combines polysaccharides with a specific plasticizer to create a composite additive. The plasticizer has a boiling point of at least 100°C and is liquid at 50°C or lower, creating a synergistic effect where the polysaccharide provides water retention and rheological properties while the plasticizer enables adhesion to difficult-to-adhere substrates with surface energy of 50 mJ/m² or lower.
Solution Approach 2:
The invention changes the physical and chemical parameters of the additive system by introducing a plasticizer with specific properties (boiling point ≥100°C, liquid at 50°C). This parameter change allows the polysaccharide-based additive to achieve adhesion capabilities it would otherwise lack, while maintaining its water retention and rheological modification functions.
2Reliability
If synthetic latex is added to improve adhesion to difficult-to-adhere substrates, then adhesion is enhanced, but the amount of latex required increases beyond what is needed for cohesion and flexibility
Solution Approach 1:
The invention replaces expensive synthetic latex with a more economical plasticizer that achieves the same adhesion function. The plasticizer, being liquid at 50°C or lower with a boiling point of at least 100°C, provides adhesion to difficult-to-adhere substrates without requiring the large quantities of latex that would otherwise be needed for cohesion and flexibility.
Solution Approach 2:
By changing from a polymer-based adhesion system (latex) to a plasticizer-based system with specific thermal properties (boiling point ≥100°C, liquid at 50°C), the invention achieves adhesion with significantly reduced material quantity while maintaining or improving other composition properties.
3Stability of the object's composition
If polysaccharides are used as the primary additive, then water retention and rheological properties are maintained, but adhesion to substrates with surface energy of 50 mJ/m² or lower is insufficient
Solution Approach 1:
The invention creates a composite additive system combining polysaccharides with a plasticizer that has a boiling point of at least 100°C and is liquid at 50°C or lower. This composite structure allows the polysaccharide to maintain water retention and rheological properties while the plasticizer component provides the necessary adhesion to substrates with surface energy of 50 mJ/m² or lower.
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 additive achieves excellent adhesion to difficult-to-adhere substrates with minimal increase in polysaccharide amount, maintaining water retention and rheological properties, and provides storage stability and ease of handling, allowing for formulations with reduced polymer binders and improved cost-efficiency.
Implementation Method 1
by adsorbing/emulsifying it onto a carrier, and then mixing with the polysaccharide particles to form a stable additive
Implementation Method 2
by adsorbing/emulsifying it onto a carrier, and then mixing with the polysaccharide particles to form a stable additive
Data Source
AI summary
The present invention provides a process to prepare a powdery additive suitable for improving adhesion of building material compositions to substrates having a surface energy of 50 mJ/m2 or lower, measured according to DIN 5660-2:2011-12, the additive comprising a polysaccharide and a plasticizer, wherein the plasticizer is liquid at 50°C or lower, has a boiling point of 100°C or higher and is selected from a specific group,comprising the steps of a) admixing the plasticizer to an aqueous medium of the polysaccharide followed by the subsequent drying of the admixture, or b) preparing a first particle comprising the plasticizer by (i) adsorbing the plasticizer onto a carrier, or by emulsifying the plasticizer with a synthetic water-soluble polymer in water and subsequently drying the emulsion, and (ii) mixing this first particle with a second particle comprising the polysaccharide wherein the mean particle size of the coarser of the first and second particle is not more than 10 times the mean particle size of the finer particle, or agglomerating the first and second particles into one particle. The invention further provides the additive obtainable by this process, use of the additive and building material compositions containing the additive as well as a process to adhere such compositions to substrates having a surface energy of 50 mJ/m2 or lower.