Paint Thickener Blend Using Starch and High-Viscosity Cellulose
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Solution Overview
Problem
Starch derivatives have been used as thickeners in paints but have shown insufficient thickening performance compared to celluloses, leading to low market acceptance and quality issues in dispersion paints, particularly in terms of washing and scrub resistances.
Innovation Solution
Combining starch or starch derivatives with high-viscosity celluloses, where the cellulose has a viscosity of over 50,000 mPa·s, to create a thickener system that achieves higher viscosities and improved paint properties without the drawbacks of using excessive starch, such as deteriorated washing and scrub resistances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If starch derivatives are used as thickeners in paints, then cost reduction and natural binder benefits are achieved, but thickening performance is insufficient and washing/scrub resistances deteriorate
Solution Approach 1:
The patent combines starch derivatives with high-viscosity cellulose ethers to create a hybrid thickener system. This merging allows the starch to provide cost benefits and natural binder properties while the high-viscosity cellulose contributes superior thickening performance and washing/scrub resistances, resolving the contradiction between cost/natural benefits and performance/reliability
Solution Approach 2:
The invention creates a composite thickener system using starch derivatives in combination with high-viscosity cellulose ethers (viscosity >50,000 mPa·s). This composite approach leverages the complementary strengths of both materials: starch provides cost-effectiveness and biodegradability while the high-viscosity cellulose ensures adequate thickening performance and durability against washing and scrubbing
2Reliability
If high-viscosity celluloses are used as thickeners, then thickening performance and washing/scrub resistances are improved, but cost increases
Solution Approach 1:
The patent merges starch derivatives with high-viscosity cellulose ethers in a cost-effective ratio. This combination allows the system to achieve the high washing and scrub resistances characteristic of pure high-viscosity cellulose systems while incorporating starch to reduce overall material cost, thus resolving the contradiction between performance/reliability and cost
3Quantity of substance
If excessive starch is used to achieve thickening, then thickening effect increases, but washing and scrub resistances deteriorate
Solution Approach 1:
The invention creates a composite thickener system where starch derivatives are combined with high-viscosity cellulose ethers. This composite approach allows achieving adequate thickening effect through the synergistic interaction of both materials, while the high-viscosity cellulose component specifically maintains washing and scrub resistances that would be compromised by using excessive starch alone
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 combination of starch and high-viscosity cellulose thickeners results in paints with enhanced washing and scrub resistances, improved roll quality, and processing behavior, effectively competing with pure cellulose systems while maintaining the benefits of starch-based solutions.
Implementation Method 1
a viscosity of >50,000 mPa·s, preferably >60,000 mPa·s and, in particular, >75,000 mPa·s, measured by the Brookfield rotation viscometer as a 2% swollen aqueous solution
Implementation Method 2
measured by the Brookfield rotation viscometer at 5 rpm and 25° C.
Data Source
AI summary
Starch(es) and starch derivatives are combined together with at least one high-viscosity cellulose as a thickener in dispersion binder-based color systems. The cellulose has a viscosity of >50,000 mPa·s, measured by the Brookfield rotation viscometer as a 2% swollen aqueous solution at 5 rpm and 25° C. A method produces dispersion binder-based color systems and a dispersion color thickener combination and a dispersion color containing the dispersion color thickener combination.