Nitrogen-Functionalized Polyvinyl Alcohol Stabilizers for Mineral Construction Materials
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Solution Overview
Problem
Polyvinyl alcohol-stabilized polymers used in mineral building materials often lead to high viscosity and trowel stickiness, and the use of cationic protective colloids can result in odor and corrosive chloride entry, while non-ionic alternatives do not adequately improve processability, particularly in terms of open time.
Innovation Solution
Stabilizing polymers with polyvinyl alcohols containing tertiary amine or quaternary ammonium groups, which are copolymerized with vinyl esters and other monomers to form nitrogen-functionalized polyvinyl alcohols that improve viscosity and cement stability without introducing corrosive substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common polyvinyl alcohols are used to stabilize polymers in mineral building materials, then the polymers are stabilized effectively, but the processability deteriorates due to high viscosity and trowel stickiness
Solution Approach 1:
The invention modifies the chemical structure of polyvinyl alcohol by introducing amine or ammonium groups, changing its properties from non-functional to nitrogen-functionalized. This parameter change in molecular structure allows the stabilizer to provide effective polymer stabilization while simultaneously improving processability by reducing viscosity and trowel stickiness, resolving the contradiction between stabilization effectiveness and ease of operation.
2Ease of operation
If cationic protective colloids based on cationic monomers are used to improve processability, then viscosity and trowel stickiness are reduced, but odor-intensive substances are released and corrosive chlorides are introduced
Solution Approach 1:
The invention changes the chemical composition of the protective colloid from conventional cationic monomers to nitrogen-functionalized polyvinyl alcohol with amine or ammonium groups. This parameter change maintains the cationic character needed for processability improvement while eliminating the harmful odors and corrosive chloride counterions associated with conventional cationic protective colloids, thus resolving the contradiction between ease of operation and harmful factors.
3Object-affected harmful factors
If non-ionic polyvinyl alcohols are used to avoid corrosive substances, then chloride entry is prevented, but processability such as open time is not sufficiently improved
Solution Approach 1:
The invention transforms non-ionic polyvinyl alcohol into nitrogen-functionalized polyvinyl alcohol by introducing amine or ammonium groups. This parameter change maintains the absence of corrosive chloride counterions while introducing cationic character that actively improves processability and open time, resolving the contradiction between preventing harmful factors and achieving sufficient processability improvement.
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 use of nitrogen-functionalized polyvinyl alcohols enhances the processing properties of mineral building materials, extending open time and reducing odor, while being cost-effective and accessible through established processes.
Implementation Method 1
stabilizing the polymers with polyvinyl alcohols containing one or more tertiary amine groups or one or more quaternary ammonium groups
Implementation Method 2
Protective colloids containing amine or ammonium groups
Implementation Method 3
lead to a further improvement in the processing properties, such as viscosity or cement stability
Data Source
AI summary
The invention relates to the use of polyvinyl-alcohol-stabilised polymerisates in mineral construction materials, characterised in that one or more polyvinyl alcohols of the polyvinyl-alcohol-stabilised polymerisates contain one or more tertiary amine groups or one or more quaternary ammonium groups.