Phosphorous-Group Concrete Superplasticizer for Slump Retention

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Solution Overview

Problem

Existing polycarboxylic acid water-reducing agents in concrete suffer from poor compatibility issues, leading to fast slump loss, abnormal setting, slow strength increase, increased shrinkage, and crack susceptibility, while phosphoric acid-based agents face production challenges such as high costs, delayed setting, and environmental hazards.

Innovation Solution

A method for preparing a concrete superplasticizer with a phosphorous acid group through free radical copolymerization of a phosphorous-containing monomer and a polyether macromonomer, resulting in a comb-like polymer with improved compatibility and stability, suitable for commercial mass production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phosphorous-containing monomer is used to prepare superplasticizer, then compatibility with concrete materials is improved, but production cost increases

Engineering Contradiction:

Improvecompatibility with concrete materialsVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive and unstable PCl3 with a cheaper, more stable phosphorous-containing monomer that can be stored and handled easily. This monomer provides the necessary phosphorous functionality for improving concrete compatibility without the handling and storage complexities of traditional reagents.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent modifies the molecular structure by incorporating phosphorous-containing functional groups into the polymer chain through copolymerization. This structural parameter change enhances the adsorption capability and compatibility with concrete materials while maintaining ease of production through straightforward polymerization processes.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If phosphoric acid group is introduced to enhance adsorption, then tolerance to calcium ions is improved, but setting time is delayed

Engineering Contradiction:

Improvetolerance to calcium ionsVSAvoidsetting time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent introduces phosphorous-containing functional groups at specific locations within the polymer structure through controlled copolymerization. This localized modification provides the necessary calcium ion tolerance and adsorption capability without excessive phosphorous content that would cause severe setting delays. The comb-like structure with side chains allows precise placement of functional groups.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a copolymer combining polyether macromonomer backbone with phosphorous-containing monomer side chains. This composite structure integrates the flow-improving polyether segments with the calcium-tolerant phosphorous groups, achieving balanced performance without the extreme setting delays associated with pure phosphoric acid-based agents.

Inventive Principle:

Principle #40Composite materials

3Reliability

If complex phosphate monomer is used, then water-reducing ability is maintained, but preparation process complexity increases

Engineering Contradiction:

Improvewater-reducing abilityVSAvoidpreparation process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses a pre-synthesized phosphorous-containing monomer that has been prepared in advance with the necessary functional groups. This preliminary preparation of the monomer allows for a simple, one-step copolymerization process to produce the final superplasticizer, avoiding complex multi-step synthesis procedures while maintaining effective water-reducing capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The phosphorous-containing monomer serves as an intermediary building block that simplifies the overall preparation process. Instead of directly incorporating complex phosphate groups into the polymer chain through complicated reactions, the pre-formed monomer acts as a mediator that can be easily incorporated through standard polymerization techniques, reducing process complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 superplasticizer enhances concrete flowability and workability, maintains stable air content, and is cost-effective with a simple preparation process, overcoming the limitations of previous agents.

Implementation Method 1

free radical copolymerization of a phosphorous-containing monomer and a polyether macromonomer

Methodology Applied

Scientific EffectFree radical copolymerization:

Implementation Method 2

introduce a phosphoric acid group having high adsorption

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP3398979B1Method for preparing concrete superplasticizer having phosphorous acid group and superplasticizer obtained

Publication Date: 2026.02.25 JIANGSU SOBUTE NEW MATERIALS CO LTD

AI summary

The present invention discloses a method for preparing a concrete superplasticizer having a phosphorous acid group and a use of the concrete superplasticizer. The concrete superplasticizer having a phosphorous acid group according to the present invention is prepared by free radical copolymerization of a phosphorous-containing monomer A and a polyether macromonomer B. The concrete superplasticizer having a phosphorous acid group obtained in the present invention can effectively improve flowability of concrete and can retain good workability of concrete. The method is simple, economical and effective, and in particular, can be used for commercial mass production.