Powder Diamide-Polyolefin Wax Rheology Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing diamide-polyolefin wax mixtures struggle to maintain good rheological properties while minimizing adverse effects on optical properties, adhesion, and surface tension in cured coatings, particularly in terms of yellowing tendency, gloss, and recoatability.
Innovation Solution
A diamide-polyolefin wax mixture with specific structural components, including diamides and carboxyl-containing polyolefin waxes, formulated to be in powder form with controlled particle size distribution, ensuring effective rheology control without impairing the properties of the coating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diamide-polyolefin wax mixtures are used as rheology control agents, then rheological properties are improved, but optical properties (yellowing tendency, gloss) and adhesion properties are negatively affected
Solution Approach 1:
The patent changes the chemical structure parameters of the diamide component by introducing hydroxyl groups at specific positions (X1 and/or X2 contain hydroxyl groups). This structural modification allows the diamide to provide effective rheology control while reducing the harmful effects of yellowing and adhesion loss, thus resolving the contradiction through parameter optimization.
Solution Approach 2:
The patent creates a composite rheology control system by combining specifically modified diamides (with hydroxyl groups) and polyolefin waxes in defined weight ratios (20-40 wt% diamide, 60-80 wt% polyolefin wax). This composite approach allows the synergistic interaction between components to achieve both good rheological control and minimized harmful effects on optical and adhesion properties.
2Reliability
If higher diamide content is used to improve rheological properties, then antisag and antisettling effects are enhanced, but adhesion and surface tension properties deteriorate
Solution Approach 1:
The patent optimizes the concentration parameter of diamide within the specific range of 20-40 wt%, preventing excessive diamide content that would cause adhesion and surface tension problems. Simultaneously, the chemical structure of the diamide is modified by adding hydroxyl groups, which allows effective rheology control at lower concentrations, thus resolving the contradiction between rheological effectiveness and adhesion preservation.
Solution Approach 2:
The patent introduces hydroxyl groups at specific positions (X1 and/or X2) of the diamide molecule, creating local functional groups that provide both rheology control capability and adhesion promotion. This localized functional modification allows the diamide to perform multiple functions simultaneously, resolving the contradiction between antisag effectiveness and adhesion maintenance.
3Ease of operation
If liquid mixtures of diamide and polyethylene wax are used, then processing is easier, but particle size control and powder form achievement are difficult
Solution Approach 1:
The patent performs preliminary mixing of diamide and polyolefin wax in the molten state before cooling and grinding. This preliminary homogenization in the liquid phase ensures uniform distribution of components, which facilitates subsequent size reduction and powder formation while maintaining compositional uniformity, thus resolving the contradiction between processing ease and particle size control.
Solution Approach 2:
The patent utilizes the phase transition of the diamide-polyolefin wax mixture from liquid (molten state for mixing) to solid (upon cooling) to achieve homogeneous mixing followed by controlled particle formation. The phase change enables easy processing during mixing while facilitating the formation of discrete particles with controllable size distribution after cooling and grinding.
Data Source
AI summary
The present invention relates to diamide-polyolefin wax mixture comprising one or more diamides (A) and one or more polyolefin waxes (B), where the diamide or diamides (A) possess a structure of the formula X1—CO—NH—Y—NH—CO—X2, in which X1 and X2 are identical or different and are linear or branched, saturated or unsaturated, optionally substituted hydrocarbon radicals having 3 to 29 carbon atoms, and Y is a divalent organic radical which is selected from the group consisting of aliphatic radicals having 2 to 26 carbon atoms, aromatic radicals having 6 to 24 carbon atoms or araliphatic radicals having 7 to 24 carbon atoms, and Y optionally comprises secondary or tertiary amino groups, and the polyolefin wax or waxes (B) carry one or more carboxyl groups and have an acid number of 3 to 50, and are homopolymers or copolymers of at least one ethylenically unsaturated olefin monomer, where the diamide or diamides (A), based on the total weight of the diamide-polyolefin wax mixture, are present in an amount of 20 wt % to less than 40 wt %, the polyolefin wax or waxes (B), based on the total weight of the diamide-polyolefin wax mixture, are present in an amount of above 60 wt % up to 80 wt %, characterized in that the diamide-polyolefin wax mixture at 25° C. is a particulate solid of defined particle size distribution, and the particles comprise both the diamide (A) and the polyolefin wax (B). The invention further relates to the preparation of the aforesaid diamide-polyolefin wax mixture, to the use thereof in liquid compositions, especially as a rheology control agent, to compositions additized accordingly, and to rheology control agents which comprise the diamide-polyolefin wax mixtures.