Matted Polyamide-PUD Coatings for Gloss Control
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Solution Overview
Problem
The coatings industry faces challenges in achieving uniform and consistent control of gloss levels in coatings, particularly in transitioning between high gloss and matte finishes, with existing methods like silica particles being limited in their ability to adjust gloss levels and affecting the coating's resistance and opacity.
Innovation Solution
The development of waterborne polymer dispersions containing polyamide and multiple urethane and/or urea linkages derived from cyclic aliphatic or aromatic primary or secondary amines, which impart a textured surface to coatings, allowing for adjustable gloss reduction and matting effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If silica particles are used to reduce gloss, then matting effect is improved, but coating porosity increases and resistance to liquids decreases
Solution Approach 1:
The invention changes the chemical composition parameter of the binder by incorporating polyamides with specific hydrogen bonding capabilities. This alters the surface energy and intermolecular forces within the coating, enabling gloss reduction through enhanced hydrogen bonding networks that create surface texture without requiring porous silica fillers, thus maintaining coating integrity and liquid resistance
Solution Approach 2:
The polyamide molecules act as intermediaries that mediate between the binder components and the coating surface. Through their hydrogen bonding groups, they create a network that controls surface morphology and light reflection, achieving matting effects while preserving the continuous phase integrity and resistance properties of the coating
2Illumination intensity
If silica particles are used to reduce gloss, then matting effect is improved, but coating opacity increases
Solution Approach 1:
The invention changes the optical parameters of the coating by modifying the binder's hydrogen bonding characteristics. This alters the refractive index and light scattering properties at the molecular level, achieving gloss reduction without introducing opaque silica particles, thereby maintaining coating transparency and color accuracy
3Illumination intensity
If polyamide from cyclic amine is used, then gloss reduction is improved, but manufacturing complexity increases
Solution Approach 1:
The invention segments the polyamide synthesis into modular components: cyclic amine monomers with specific hydrogen bonding groups are used as building blocks. These standardized segments can be systematically combined with different diacids to create a family of polyamides with tuned gloss reduction properties, simplifying the overall manufacturing process through repeatable modular synthesis
Solution Approach 2:
The invention changes the synthesis parameters by selecting cyclic amine monomers that react under mild, water-compatible conditions. This allows for simplified polymerization processes that can be integrated into existing waterborne coating manufacturing lines, reducing the need for specialized equipment or complex process control
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
These polymer dispersions effectively reduce gloss and enhance matting while maintaining the coating's resistance and opacity, providing a flexible solution for achieving desired finish levels in coatings and inks.
Implementation Method 1
polyamides from specific cyclic aliphatic or aromatic primary or secondary amine groups that impart low gloss (high matte) finishes to coatings
Implementation Method 2
a matted (lower gloss) coating or ink surface is desired that reflects incident light in a variety of directions due to the coating's surface variations
Data Source
AI summary
Polymers are disclosed that incorporate portions of secondary or tertiary polyamide segments connected with polyisocyanates. These polymers have enhanced matting properties. The enhanced matting properties are from creating an inherently matt surface from the polymer without the use of any separate fine particle size matting additives. Conventional matting agents such as fine particle size silica usually results in loss of physical properties such as haze development and porosity in the coating from the matting agent. Composites and hybrids of these polymers and other polyamides, polyurethane with vinyl polymers (acrylates) are also disclosed and claimed.