Aromatic Polyol Zinc Oxide Dispersion for Agglomeration Prevention
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Solution Overview
Problem
Zinc oxide dispersions in polyols suffer from poor dispersibility and agglomeration, posing safety concerns and stability issues, particularly when used in applications like antimicrobial textiles and coatings.
Innovation Solution
A dispersion comprising zinc oxide and an aromatic polyol with terminal hydroxyl groups, which form chelating bonds with zinc atoms, preventing agglomeration through steric effects, is prepared by heating a zinc-containing salt and aromatic polyol to form a stable zinc oxide component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc oxide is used in powdered form, then it provides antimicrobial effects, but it has poor dispersibility and may be harmful if inhaled
Solution Approach 1:
The patent changes the physical state of zinc oxide from powder to dispersion form in polyol, and modifies the chemical structure of the polyol by introducing aromatic rings and controlling hydroxyl group positions. This parameter change transforms the material from a harmful powder into a safe, easily dispersible liquid dispersion while maintaining antimicrobial efficacy.
Solution Approach 2:
The patent uses polyol as an intermediary medium to disperse zinc oxide particles. The polyol with specific molecular structure acts as a mediator that prevents direct contact between zinc oxide particles and air (reducing inhalation risk) while providing a stable dispersion medium that improves handling and application properties.
2Ease of operation
If zinc oxide is dispersed in conventional polyols, then it provides convenience and safety, but it suffers from agglomeration and precipitation
Solution Approach 1:
The patent modifies the polyol parameters by introducing aromatic rings at specific positions and controlling the distance between hydroxyl groups. These parameter changes enable the polyol to form stable chelating bonds with zinc oxide, preventing agglomeration and precipitation while maintaining the convenience and safety of dispersion form.
Solution Approach 2:
The patent creates a composite system where zinc oxide is chemically bonded to a specifically structured polyol. This composite material combines the antimicrobial properties of zinc oxide with the stabilizing and solubilizing properties of the aromatic polyol, achieving both convenience and long-term stability.
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 resulting dispersion exhibits improved stability and dispersibility, maintaining fluidity and transparency, even at high temperatures, suitable for various applications including antimicrobial textiles and coatings, with reduced risk of precipitation.
Implementation Method 1
an aromatic polyol which is represented by Formula (I), and which has terminal hydroxyl groups that form chelating bonds with zinc atoms of the zinc oxide component
Implementation Method 2
the zinc-containing salt undergoes a nucleophilic reaction to form a zinc intermediate product including one of a zinc-containing hydroxide and a zinc-containing alkoxide
Implementation Method 3
the zinc intermediate product undergoes a condensation reaction to form a zinc oxide component
Implementation Method 4
heating a composition including a zinc-containing salt, and an aromatic polyol which is represented by Formula (I), and which has terminal hydroxyl groups, so that the zinc-containing salt undergoes a nucleophilic reaction
Data Source
AI summary
A dispersion includes a zinc oxide component, and an aromatic polyol which is represented by Formula (I) and which has terminal hydroxyl groups that form chelating bonds with zinc atoms of the zinc oxide component,wherein p and q are independently integers ranging from 1 to 40. A method for preparing the dispersion includes heating a composition including the aromatic polyol and a zinc-containing salt, so that the zinc-containing salt undergoes nucleophilic reaction and condensation reaction to form the zinc oxide component. A composition for preparing the dispersion is also disclosed.