High-Solid Coating Composition with Controlled Polyol Distribution
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Solution Overview
Problem
High-solid coating compositions face challenges in drying speed and appearance quality due to the use of high non-volatile resin content, leading to reduced reactivity and coating film flow, which deteriorates workability and appearance.
Innovation Solution
A high-solid coating composition comprising 70-80 wt% acrylic resin, 15-21 wt% solvent, and 1-4 wt% additives, with specific ratios of non-volatile components and solvents, including a combination of quick, medium, and slow-drying solvents, to enhance drying properties and workability while maintaining low VOC levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If high non-volatile resin content is used to achieve high solidification, then VOC emissions are reduced, but drying speed deteriorates and coating workability significantly deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight distribution of polyol resins (specifically adjusting the ratio of low molecular weight to high molecular weight polyol resins) and the hydroxyl group content to achieve optimal drying speed and workability in high-solid coating compositions with 60-70 wt% non-volatile content
Solution Approach 2:
The patent uses composite materials by combining multiple types of polyol resins with different molecular weights and hydroxyl group contents to create a synergistic effect that maintains both high solid content and good coating performance, avoiding the use of a single resin type
2Speed
If low molecular weight resin is used to improve reactivity, then drying properties improve, but coating film flow occurs and appearance quality deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight distribution and hydroxyl group content of polyol resins to achieve the optimal balance between drying speed and appearance quality, preventing coating film flow while maintaining fast drying
Solution Approach 2:
The patent applies local quality by using a distribution of different molecular weight resin components rather than a single uniform resin, allowing different regions of the coating to exhibit different properties during the drying process
3Object-generated harmful factors
If high solid content is used to reduce solvent amount, then VOC emissions are reduced, but the composition is slowly dried and productivity decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the hydroxyl group content and molecular weight distribution of polyol resins to accelerate drying speed in high-solid coating compositions, thereby improving productivity while maintaining low VOC emissions
Solution Approach 2:
The patent changes physical parameters by controlling viscosity and molecular weight distribution to achieve faster drying rates without increasing solvent content, thus maintaining high productivity in high-solid coatings
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 composition achieves improved coating workability and appearance quality with reduced VOCs, maintaining high non-volatile content and low viscosity, resulting in enhanced drying properties and appearance evaluation indices.
Implementation Method 1
a high-solid coating composition having the following configuration: about 70 wt % to about 80 wt % of an acrylic resin and about 15 wt % to about 21 wt % of a solvent
Data Source
AI summary
A high-solid coating composition may include about 70 wt % to about 80 wt % of an acrylic resin; and about 15 wt % to about 21 wt % of a solvent, wherein a content of non-volatile components (NVs) is about 55 wt % to about 60 wt %, a solid by volume ratio (SVR) is about 50% to about 55%, and a combination factor (CF) value being an appearance evaluation index is about 78% or more.