Starch Binder Blend for Coating Rheology and Quality
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Solution Overview
Problem
Current coating compositions rely on expensive synthetic binders, and while starch has been proposed as a natural alternative, high concentrations of starch can lead to undesirable mottling and surface strength issues, necessitating the development of new natural binders that can replace synthetic compounds without compromising paper quality.
Innovation Solution
A coating composition comprising a blend of non-thinned and thinned starches, where the non-thinned starch is selected from native, acetylated, or cross-linked starches and the thinned starch is dextrin, in a weight ratio of 30:70 to 1:99, which can replace synthetic binders and improve rheology without affecting surface strength or mottling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If starch is used as a natural binder to replace synthetic binders, then environmental-friendliness and cost are improved, but paper quality deteriorates due to mottling and surface strength reduction at higher concentrations
Solution Approach 1:
The patent applies parameter changes by modifying the molecular weight distribution of starch through controlled thinning processes. By adjusting the degree of thinning and creating a specific blend ratio of thinned and non-thinned starches, the invention achieves optimal rheological properties that prevent mottling while maintaining surface strength, thus resolving the contradiction between using natural starch binders and maintaining paper quality
Solution Approach 2:
The patent employs composite materials by creating a blend of thinned starch and non-thinned starch in specific ratios. This composite approach combines the benefits of both highly thinned starch (good rheology) and less thinned starch (good surface strength), allowing the use of natural starch binders without the quality deterioration that occurs with单一 starch types
2Quantity of substance
If high concentrations of starch are used to increase natural binder content, then synthetic binder replacement is improved, but coating composition quality deteriorates due to mottling and rheology issues
Solution Approach 1:
The patent changes the physical-chemical parameters of starch by controlling the thinning degree and molecular weight distribution. This allows higher starch concentrations to be used without causing mottling, as the modified starch structure maintains proper flow characteristics and coating uniformity even at elevated concentrations
3Manufacturing precision
If synthetic binders are used to maintain coating composition quality, then paper quality is improved, but cost and environmental-friendliness deteriorate
Solution Approach 1:
The patent modifies starch parameters through controlled thinning to achieve rheological properties that closely match synthetic binders. By adjusting molecular weight and distribution, the natural starch binder can deliver comparable coating quality and surface strength without the environmental drawbacks of synthetic materials
Solution Approach 2:
The patent employs a renewable, biodegradable natural starch binder that can be produced from abundant agricultural resources. This replaces expensive, petroleum-based synthetic binders with a cost-effective, environmentally-friendly alternative that maintains coating quality while reducing environmental impact and cost
Data Source
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AI summary
The present invention provides a starch mixture for use in the preparation of coating compositions - and to coating compositions prepared therewith - characterized in that the starch mixture comprises (a) a non-thinned starch; and (b) a thinned starch.