Hydrophobized Modified Starch Coating for Stable Paper Application
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Solution Overview
Problem
Existing oil-resistant agents for paper face challenges in achieving both high concentration application and effective oil resistance, as high concentrations lead to increased viscosity, making stable application difficult, while low concentrations fail to impart sufficient oil resistance.
Innovation Solution
A water- and oil-repellent agent comprising a hydrophobized modified starch with a viscosity of 60 cps or less at 50°C in a 20% aqueous solution, accounting for 60% or more of the modified starch content, which facilitates easy application and enhances both water and oil repellencies on paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentration of modified starch is used in oil-resistant agent, then oil resistance performance is improved, but viscosity increases making stable application difficult
Solution Approach 1:
The patent applies parameter changes by controlling the viscosity of the modified starch aqueous solution to be 60 cps or less at 50°C, and specifying that hydrophobized modified starch accounts for 60% or more of the total modified starch. These parameter specifications allow high concentration application (15% or more modified starch) while maintaining low viscosity for stable application, thus resolving the contradiction between oil resistance performance and ease of application.
2Ease of operation
If low concentration of modified starch is used in oil-resistant agent, then viscosity remains low facilitating application, but oil resistance performance becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges: modified starch content at 15% or more, hydrophobized modified starch at 60% or more of total modified starch, and viscosity of 60 cps or less at 50°C. These parameters enable the formulation to achieve both sufficient oil resistance performance and stable application characteristics simultaneously.
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 agent effectively imparts excellent water and oil repellencies to paper, even at high concentrations, ensuring stable application and improved performance.
Implementation Method 1
a hydrophobized modified starch that exhibits a viscosity of 60 cps or less at 50° C. in a 20 mass % aqueous solution
Data Source
AI summary
A water- and oil-repellent agent including: a modified starch, the modified starch including a hydrophobized modified starch that exhibits a viscosity of 60 cps or less at 50° C. in a 20 mass % aqueous solution, the hydrophobized modified starch accounting for 60% by mass or more of the modified starch contained in the water- and oil-repellent agent, where the amount of the modified starch in the water- and oil-repellent agent is 15% by mass or more.