Matting Coating Agent with Nanoparticles for Elasticity
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Solution Overview
Problem
Existing coatings struggle to achieve a balance between high elasticity and low gloss, as high concentrations of matting agents required for deep matte finishes compromise mechanical properties like flexibility and deformability.
Innovation Solution
A coating agent comprising an aqueous dispersion of hydroxy-functional prepolymer, nanoparticles with a specific size range, and a crosslinker, which provides excellent matting and elasticity while maintaining mechanical integrity, is developed. This composition includes a hydroxy-functional prepolymer formed from reacting polycarbonate polyol, polyester polyol, polyisocyanate, and a compound with reactive groups, along with nanoparticles and a crosslinker reactive to hydroxy groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high concentrations of matting agents are used to produce very low gloss values, then the matting ability is improved, but the flexibility and deformability of the coating deteriorate
Solution Approach 1:
The patent introduces a specifically designed binder system as an intermediary between the matting agent and the coating matrix. The binder comprises polyurethane resin with controlled molecular weight (5,000-50,000) and specific composition ratios, which mediates the interaction between matting agents and the coating structure, allowing high matting agent concentrations without compromising flexibility
Solution Approach 2:
The patent changes key parameters of the binder system: molecular weight range (5,000-50,000), polyol composition ratios (polycarbonate polyol 30-70 wt%, polyester polyol 30-70 wt%), and crosslinking density. These parameter changes enable the coating to maintain flexibility while accommodating high matting agent concentrations for deep matte finishes
2Illumination intensity
If conventional coating agents are used for deep matt formulations, then the matting ability is insufficient, but the elasticity of the coating is also insufficient
Solution Approach 1:
The patent creates a composite binder system combining polyurethane resin with specific polyol ratios (polycarbonate and polyester), crosslinking agents, and carefully controlled molecular weight distribution. This composite material structure provides both the matting ability and elasticity that conventional single-component systems cannot achieve
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: binder molecular weight (5,000-50,000), polyol composition ratios, crosslinking agent types and amounts, and curing conditions. These coordinated parameter changes enable the coating to achieve both deep matte appearance and high elasticity
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 coating agent achieves high elasticity with very low gloss levels, allowing it to withstand mechanical deformation without damage, while maintaining excellent matting properties and storage stability.
Implementation Method 1
a crosslinker which has at least two groups reactive towards hydroxy groups
Implementation Method 2
a group reactive towards isocyanate groups is understood to mean a group which can react with an isocyanate group to form a covalent bond
Implementation Method 3
nanoparticles with a number-average particle size of 5 to 100 nm
Data Source
AI summary
The present invention relates to a coating agent which is particularly suitable for producing mattable coatings. The coating agent comprises: a) an aqueous dispersion of a hydroxy-functional prepolymer, which can be obtained by reacting at least the following components: i) a component comprising a hydroxy group, ii) a polyester polyol comprising a hydroxy group, iii) a polyisocyanate comprising an isocyanate group, iv) a compound comprising at least two groups reactive with respect to isocyanate groups and at least one group capable of anion formation, v) water, wherein the components i)-iii) and the ratio of components i)-iii) are selected such that there is an excess of hydroxy groups over the isocyanate groups; b) nanoparticles with a number average particle size of 1 to 1,000 nm; and c) a crosslinker, which comprises at least two groups reactive with respect to hydroxy groups. The invention further relates to a method for producing the coating agent, the use of the coating agent to produce a coating on a substrate and to a coating which can be obtained by applying the coating agent to a substrate.