Copolymer Mixture Superplasticizer for Concrete Water Reduction
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Solution Overview
Problem
Existing superplasticizers for concrete require excessive mixing water, leading to poorer mechanical strengths and durabilities due to excess water evaporation, and lack robustness and universality in adapting to varying cement qualities and temperature variations.
Innovation Solution
A polymer composition comprising copolymers H and K with polyether macromonomer and acid monomer structural units, featuring mixed side chains with varying ether oxygen atoms, optimized for mass efficiency and adaptability, allowing for targeted water reduction and consistency maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If copolymers with polyether macromonomer structural units and acid monomer structural units are used as superplasticizers, then water reduction and workability improvement are achieved, but the copolymers lack robustness and universality in adapting to varying cement qualities and temperature variations
Solution Approach 1:
The patent divides the superplasticizer into a mixture of two distinct copolymers (H and K) with different polyether macromonomer structural units. Copolymer H contains polyether macromonomers with shorter side chains while copolymer K contains polyether macromonomers with longer side chains. This segmentation allows each copolymer to contribute different functional properties, achieving both water reduction and adaptability to varying conditions.
Solution Approach 2:
The patent applies local quality by creating copolymers with heterogeneous side chain lengths within the same polymer structure. Each copolymer contains a distribution of polyether macromonomer side chains with different lengths (short, medium, long), allowing different regions of the polymer to interact differently with cement particles and water, thereby achieving robust performance across varying cement qualities and temperatures.
2Ease of operation
If excessive mixing water is added to achieve processing consistency, then workability is improved, but mechanical strengths and durabilities deteriorate due to excess water evaporation
Solution Approach 1:
The patent changes the chemical parameters of the superplasticizer by using a specific copolymer mixture composition (5-50 wt% of copolymer H and 50-95 wt% of copolymer K) with defined polyether macromonomer structural units. This parameter change allows the superplasticizer to maintain concrete workability at lower water/binder ratios, preventing the formation of excess water that would otherwise evaporate and create cavities, thereby preserving mechanical strength and durability.
3Ease of operation
If higher amounts of superplasticizer are used to maintain flowability, then concrete workability is improved, but cost-efficiency deteriorates
Solution Approach 1:
The patent creates a composite superplasticizer system by combining two copolymers with complementary properties. Copolymer H with shorter polyether side chains provides steric stabilization and water reduction, while copolymer K with longer polyether side chains provides adsorption on cement particles and flow enhancement. This composite approach achieves superior flowability at lower total superplasticizer dosages, improving cost-efficiency.
Data Source
AI summary
The invention relates to a polymer composition containing 5 to 95% by weight of a copolymer H and 2 to 60% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, the polyether macromonomer structural units of the copolymer H having side chains containing in each case at least 5 ether oxygen atoms, the number of ether oxygen atoms per side chain of the polyether macromonomer structural units of the copolymer H varying in such a way that the corresponding frequency distribution diagram, in which the number of ether oxygen atoms per side chain of a polyether macromonomer structural unit is plotted along the abscissa and the associated frequency for the copolymer H is plotted along the ordinate, contains at least 2 maxima.