Comb Polymer Cement Dispersant for High-Temperature Workability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dispersants for oil well cement slurries face issues such as low compatibility with modern additives, poor dispersion efficiency for complex particles, and environmental concerns due to the use of formaldehyde-based materials, particularly at high temperatures exceeding 120°C.
Innovation Solution
A polymer with a comb-shaped structure, comprising unsaturated polyether, unsaturated carboxylic acid, and silane/siloxane units, is developed through solution polymerization, offering high temperature resistance, excellent dispersibility, and compatibility with other additives, with a weight average molecular weight of 20,000-90,000 g/mol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cement dispersants (polymer emulsions or powder additives) are used, then cement mixing and construction workability are improved, but construction site hygiene deteriorates due to dust generation and liquid carrier residue
Solution Approach 1:
The patent changes the physical state parameter of the dispersant from liquid or powder to solid granular form. This parameter change eliminates the need for liquid carriers that cause residue and prevents dust generation while maintaining the dispersing function through the granular structure itself
Solution Approach 2:
The granular dispersant is designed to be mixed directly with cement and consumed in the mixing process, eliminating the need for separate application steps and cleanup. The dispersant serves its function and is incorporated into the cement matrix, avoiding residue issues
2Ease of operation
If high dosages of dispersant are used to achieve desired slump, then workability is improved, but cost increases and risk of segregation and bleed increases
Solution Approach 1:
The patent changes the dosage parameter from conventional high dosages (0.5-2.0% by weight of cement) to low dosages (0.05-0.5% by weight of cement). This parameter change achieves the same workability improvement while reducing the risk of segregation and bleed that occurs with excessive dispersant dosage
3Manufacturing precision
If conventional polymer dispersants are used, then cement dispersion is improved, but environmental compatibility deteriorates due to harmful monomer residues
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific monomers with low toxicity and high reactivity (acrylic acid, itaconic acid, maleic acid). These monomers polymerize completely to form the dispersant polymer, minimizing residual monomer content and improving environmental compatibility while maintaining dispersion effectiveness
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 polymer significantly reduces retarding properties at high temperatures, maintains high dispersibility, and enhances compatibility with other additives, effectively preventing cement slurry thickening, suitable for temperatures up to 150°C.
Implementation Method 1
The polymer for use in cement according to claim 1 has a dispersing function based on electrostatic repulsion and steric hindrance
Implementation Method 2
The polymer for use in cement according to claim 1 has a dispersing function based on electrostatic repulsion and steric hindrance
Implementation Method 3
polycarboxylic acid cement dispersant comprising a polymer chain having a carboxylic acid group
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure provides a polymer having a dispersing function, a preparation method therefor and use thereof as a cement dispersant. The polymer comprises a structural unit (a), a structural unit (b) and a structural unit (c); wherein the structural unit (a) is provided by an unsaturated polyether, the structural unit (b) is provided by an unsaturated acid and/or a salt thereof and/or an anhydride thereof, and the structural unit (c) is provided by a silane and/or siloxane comprising a polymerizable group and having no less than five carbon atoms; the molar ratio of the structural unit (a), the structural unit (b) and the structural unit (c) is 1: (1-20): (0.01-0.5); and the polymer has a weight average molecular weight of 20,000-90,000g/mol. Compared with the prior art, the polymer and the dispersant provided by the present disclosure can significantly reduce the retarding property of polycarboxylic acid, especially completely do not have the retarding property at a high temperature of higher than 120°C, while maintaining a higher dispersibility when a higher amount of acid is used. In addition, the dispersant provided by the present disclosure is compatible with other additional additives.