Polysiloxane Block Polymer Dispersant for High-Temperature Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polymer dispersants lack high-temperature resistance, failing to maintain effective dispersion and stability at elevated temperatures, necessitating the development of a temporary high-temperature-resistant dispersing agent with low residual char yield.
Innovation Solution
A block high-molecular polymer is synthesized through a one-step Mannich reaction using an organosilicon compound with two amino groups, exhibiting high thermal stability and low char yield, allowing it to function as a dispersant within a specific high-temperature range before degrading and being removed from the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polymer dispersants are used, then dispersion performance is achieved at room temperature, but high-temperature resistance is insufficient and decomposition occurs above 170-210°C
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersant by introducing polysiloxane backbone structures with Si-O-Si bonds, which have higher bond energy and thermal stability compared to conventional carbon-based polymer chains. This parameter change enables the dispersant to maintain structural integrity and dispersion functionality at temperatures above 200°C without decomposition
Solution Approach 2:
The patent creates a composite molecular structure combining polysiloxane backbone with grafted polymer chains containing dispersing functional groups. This composite structure integrates the high thermal stability of polysiloxane with the dispersion capabilities of traditional polymer dispersants, achieving both high-temperature resistance and effective dispersion performance
2Temperature
If high-temperature resistant dispersants are used, then thermal stability is improved, but residual char yield increases after degradation
Solution Approach 1:
The patent designs a temporary dispersant based on polysiloxane that performs its dispersion function at high temperatures and then degrades completely into volatile products without leaving significant residual char. The Si-O bonds break down into silicon-containing volatile species, achieving complete removal from the system and avoiding the high char yield problem of conventional high-temperature dispersants
3Quantity of substance
If polymer dispersants with thick adsorption films are used, then steric hindrance effect is enhanced for dispersion, but the dispersant cannot be easily removed after serving its function
Solution Approach 1:
The patent creates a dynamic dispersant system where the polysiloxane chains provide sufficient adsorption film thickness for steric hindrance effect during the dispersion process, but the same molecular structure allows for controlled degradation and removal after the dispersant has served its purpose, achieving both effective dispersion and easy removal
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 temporary high-temperature-resistant dispersing agent demonstrates excellent dispersion performance under high-temperature conditions with good temperature resistance and simple post-treatment, offering advantages over existing dispersants by maintaining stability and facilitating easy removal.
Implementation Method 1
A block high-molecular polymer is synthesized through a one-step Mannich reaction using an organosilicon compound with two amino groups
Implementation Method 2
A main effect of the polymer dispersants is a steric hindrance effect of a physical adsorption film on its surface
Implementation Method 3
when the temperature is further increased, a degradation reaction can occur to remove the dispersant from the system and the char yield is low
Data Source
AI summary
A temporary high-temperature-resistant dispersing agent, and a preparation and a use method thereof. The temporary high-temperature-resistant dispersing agent is a block high-molecular polymer prepared by a one-step reaction from polysiloxane containing an amino group. The prepared block high-molecular polymer may be directly used as a dispersant; the block high-molecular polymer may also be used as a basic formula and used as the dispersant after other auxiliary compositions are added; and the block high-molecular polymer may also be used in combination with one or more other dispersion auxiliaries and/or surfactants to meet dispersion requirements in various special occasions.