Aqueous Coating Composition with Cellulose Nanofibers for Finish and Glitter
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Solution Overview
Problem
Existing aqueous coating compositions fail to achieve a balance between excellent finished appearance and glittering appearance, particularly when using glitter pigments, and there is a demand for environmentally friendly alternatives.
Innovation Solution
An aqueous coating composition comprising a hydroxyl group-containing resin, a curing agent, a glitter pigment, and cellulose nanofibers with specific carboxyl group content and aspect ratio, applied in a multilayer coating film forming method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an aqueous base coating composition containing glitter pigment and aqueous cellulose derivative is used, then metallic luster is improved, but finishing properties deteriorate
Solution Approach 1:
The patent uses a composite binder system combining aqueous cellulose derivative and hydroxyl group-containing resin in specific ratios (cellulose derivative: 10-50 mass%, hydroxyl resin: 50-90 mass%). This composite approach allows the cellulose derivative to provide metallic luster enhancement while the hydroxyl resin contributes to finishing properties, resolving the contradiction between appearance quality and surface finish.
2Illumination intensity
If glitter pigment content is increased to enhance glittering appearance, then flip-flop property is improved, but coating film formation quality deteriorates
Solution Approach 1:
The patent optimizes glitter pigment content within a specific range (10-50 mass% based on solid content) and adjusts the binder composition ratio to maintain coating film formation quality. By changing the parameters of binder composition and pigment content simultaneously, the patent achieves both excellent glittering appearance and proper coating film formation.
3Object-affected harmful factors
If conventional aqueous coating materials are used, then environmental impact is reduced, but aesthetic quality (finished appearance and glittering appearance) deteriorates
Solution Approach 1:
The patent creates a composite aqueous coating system combining cellulose derivative, hydroxyl group-containing resin, and glitter pigment in optimized ratios. This composite formulation achieves high aesthetic quality with excellent metallic luster and glittering appearance while maintaining the environmental benefits of aqueous-based coating materials, avoiding the need for harmful organic solvents.
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 forms a coating film with superior finished and glittering appearance, meeting aesthetic and environmental demands.
Implementation Method 1
an aqueous coating composition comprising a hydroxyl group-containing resin (A), a curing agent (B), a glitter pigment (C), and a cellulose nanofiber (D)
Implementation Method 2
a hydroxyl group-containing resin (A), a curing agent (B)
Data Source
AI summary
The purpose of the present invention is to provide an aqueous coating material composition capable of forming a coating film having an excellent finished appearance and glossiness. This aqueous coating material composition contains: (A) a hydroxyl group-containing resin; (B) a curing agent; (C) a photoluminescent pigment; and (D) cellulose nanofibers. The cellulose nanofibers (D) have a carboxyl group amount of 0.80-1.10 mmol/g relative to the absolute dry mass of the cellulose nanofibers and have an average aspect ratio of not less than 20 but less than 50.