Hydraulic Dispersant Composition Stabilizing Fluidity Across Temperatures
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Solution Overview
Problem
Conventional dispersants for hydraulic compositions, such as naphthalene-based and polycarboxylic acid-based dispersants, exhibit temperature-dependent fluidity and material separation resistance, leading to inconsistent performance in varying temperatures, and their combination often reduces fluidity rather than enhancing it.
Innovation Solution
A dispersant composition comprising a high-molecular compound with a naphthalene ring-containing monomer unit, a polymer with carboxylic acid, phosphate, and alkyleneoxy groups, and specific compounds that interact with the naphthalene ring to stabilize fluidity and improve early strength in hydraulic compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polycarboxylic acid-based dispersants are used to achieve good dispersibility in low water/cement ratio compositions, then dispersibility is improved, but temperature dependency increases causing fluidity and material separation resistance to change under high and low temperatures
Solution Approach 1:
The patent combines polycarboxylic acid-based dispersant (A) with naphthalene-based dispersant (B) and water-soluble acid calcium salt (C) to create a composite dispersant system. This composite approach leverages the strong dispersibility of polycarboxylic acid-based dispersants while using naphthalene-based dispersants and calcium salts to stabilize fluidity across temperature variations, thereby reducing overall temperature dependency.
Solution Approach 2:
The patent specifies precise parameter ranges: polycarboxylic acid-based dispersant with weight average molecular weight of 5,000-500,000, naphthalene-based dispersant with weight average molecular weight of 10,000-1,000,000, and water-soluble acid calcium salt with solubility of 5 or more at 25°C. By optimizing these parameters, the composition achieves both good dispersibility and reduced temperature dependency.
2Temperature
If naphthalene-based dispersants are used to maintain stable fluidity across temperature changes, then temperature dependency is reduced, but dispersibility in low water/cement ratio compositions deteriorates
Solution Approach 1:
The patent creates a composite dispersant system combining naphthalene-based dispersant (B) which provides temperature stability, with polycarboxylic acid-based dispersant (A) which provides superior dispersibility in low water/cement ratio compositions. The synergistic interaction between these two dispersant types allows the composition to achieve both fluidity stability across temperatures and effective dispersibility.
Solution Approach 2:
The patent optimizes the molecular weight parameters of both dispersant types: polycarboxylic acid-based dispersant with weight average molecular weight of 5,000-500,000 and naphthalene-based dispersant with weight average molecular weight of 10,000-1,000,000. This parameter optimization ensures that the composite system maintains both temperature stability and dispersibility performance.
3Reliability
If both naphthalene-based dispersant and polycarboxylic acid-based dispersant are used in combination to overcome temperature dependency and improve dispersibility, then both dispersibility and temperature stability are improved, but fluidity is reduced making the dispersant practically unusable
Solution Approach 1:
The patent introduces water-soluble acid calcium salt (C) as an intermediary substance that mediates between the two dispersant types. This calcium salt component facilitates the synergistic interaction between polycarboxylic acid-based dispersant (A) and naphthalene-based dispersant (B), enabling them to work together without causing excessive viscosity increase, thus maintaining practical usability.
Solution Approach 2:
The patent specifies that the water-soluble acid calcium salt must have a water solubility of 5 or more at 25°C. This solubility parameter ensures that the calcium salt remains dissolved and actively mediates the interaction between dispersants, preventing precipitation and excessive viscosity buildup that would harm fluidity.
4Reliability
If water-soluble acid calcium salt with high solubility is added to enhance the synergistic effect between dispersants, then the synergistic effect is improved, but viscosity of the hydraulic composition increases
Solution Approach 1:
The patent precisely controls the solubility parameter of the water-soluble acid calcium salt, requiring it to have a water solubility of 5 or more at 25°C. This parameter control ensures optimal dissolution and synergistic effect while preventing excessive viscosity increase. The patent also controls the dosage of calcium salt relative to the dispersants to maintain balance between synergistic effect and viscosity.
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 maintains consistent fluidity across temperature variations and enhances early strength in hydraulic compositions by stabilizing the interaction between naphthalene-based and polycarboxylic acid-based dispersants, preventing viscosity increase and improving dispersibility.
Implementation Method 1
a polymer having a weight average molecular weight of 1,000 or more and 1,000,000 or less, and having: a monomer unit having a group selected from a carboxylic acid group, a phosphate group, a group that changes to a carboxylic acid group by hydrolysis, and a group that changes to a phosphate group by hydrolysis
Implementation Method 2
a monomer unit having an alkyleneoxy group
Implementation Method 3
a high-molecular compound having a naphthalene ring-containing monomer unit
Implementation Method 4
a polymer having a weight average molecular weight of 1,000 or more and 1,000,000 or less, and having: a monomer unit having a group selected from a carboxylic acid group, a phosphate group
Implementation Method 5
a monomer unit having an alkyleneoxy group
Data Source
AI summary
The present invention is a dispersant composition for a hydraulic composition, which includes (A) a high-molecular compound having a naphthalene ring-containing monomer unit, (B) a polymer having a weight average molecular weight of 1,000 or more and 1,000,000 or less, and having: a monomer unit having a group selected from a carboxylic acid group, a phosphate group, a group that changes to a carboxylic acid group by hydrolysis, and a group that changes to a phosphate group by hydrolysis; and a monomer unit having an alkyleneoxy group, and (C) a specific compound represented by the general formulas (C1) to (C4).