Olefin Wax Oxidation for Hardness and Viscosity Control
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Solution Overview
Problem
Alpha olefin waxes have difficulty achieving a combination of high physical strength and low viscosity, as these properties are generally correlated with molecular weight, making it challenging to enhance their performance in applications such as polishing and coating without compromising on melt flow.
Innovation Solution
A process involving the contact of olefin wax compositions with an oxygen-containing gas at a temperature above their melting point to produce hardened or oxidized olefin wax compositions with reduced needle penetration and controlled viscosity, potentially incorporating additives like amides or imides to enhance hardness while maintaining low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the molecular weight of alpha olefin wax is increased to improve physical strength and hardness, then the viscosity increases undesirably, but if the molecular weight is kept low to maintain low viscosity, then the physical strength and hardness are insufficient
Solution Approach 1:
The patent applies parameter changes by oxidizing the alpha olefin wax to alter its chemical composition and physical properties. The oxidation process modifies the molecular structure, creating cross-linked or functionalized groups that enhance hardness and physical strength without requiring a proportional increase in molecular weight, thus avoiding the viscosity penalty that would normally result from using higher molecular weight waxes.
Solution Approach 2:
The patent creates a composite structure within the wax by introducing oxidized functional groups (such as carboxyl, hydroxyl, or carbonyl groups) alongside the base hydrocarbon chains. This composite molecular architecture allows the wax to exhibit enhanced mechanical properties from the oxidized groups while maintaining the low viscosity characteristics of the hydrocarbon matrix, effectively decoupling the trade-off between strength and viscosity.
2Adaptability or versatility
If oxidation is applied to enhance functionality and polarity for specific applications, then the viscosity increases and discoloration occurs, but for applications requiring low viscosity and white color, oxidation must be minimized
Solution Approach 1:
The patent employs controlled parameter changes in the oxidation process, specifically controlling the oxidation level to achieve the minimum necessary functionality. By optimizing oxidation parameters (such as oxidant concentration, temperature, and contact time), the patent introduces sufficient functional groups for desired applications while preventing excessive oxidation that would cause viscosity increase and discoloration, thus maintaining the wax's suitability for low-viscosity applications.
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 hardened or oxidized olefin wax compositions exhibit improved hardness and low viscosity, suitable for various applications like polishes and coatings, with minimal impact on processing flow, and can be used in polishes, coatings, and inks.
Implementation Method 1
It is well known that a range of hydrocarbon waxes can be oxidized into functional waxes by reacting oxygen or oxygen-containing gas with waxes at elevated temperatures. The oxidation changes the chemical compositions via a free-radical mechanism, which converts hydrocarbon molecules of waxes into esters, acids, and other minor components.
Data Source
AI summary
A process to oxidize an olefin wax, comprising: contacting a feedstock olefin wax composition with an oxygen-containing gas at a temperature greater than a melting point of the feedstock olefin wax composition melting point, to prepare an oxidized olefin wax composition wherein the oxidized olefin wax composition has an acid number greater than 1 mg KOH/g oxidized olefin wax composition and a kinematic viscosity at 100° C. less than 70 cSt.