Starch Composite Particles with Crosslinking for Moisture Resistance
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Solution Overview
Problem
Starch-based structures plasticized by thermoplasticizers exhibit high moisture absorption, leading to decreased mechanical strength and potential deformation in humid environments, necessitating improved moisture resistance and mechanical strength.
Innovation Solution
A composite body comprising starch composite particles containing starch, a plasticizer, and a crosslinking agent, dispersed within fibers, where the starch is plasticized and chemically crosslinked to enhance mechanical strength and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If starch is plasticized by thermoplasticizer to replace petroleum-derived raw materials, then mechanical strength is improved, but moisture absorption increases leading to decreased mechanical strength and deformation in humid environments
Solution Approach 1:
The patent uses a composite material system consisting of starch, plasticizer, and crosslinking agent. The crosslinking agent forms crosslinked structures within the plasticized starch matrix, creating a composite material that combines the biodegradability and initial strength of starch with the moisture resistance provided by the crosslinked network structure.
Solution Approach 2:
The patent changes the chemical structure of starch by introducing crosslinks through the crosslinking agent. This parameter change in the molecular structure transforms the linear or branched starch chains into a three-dimensional crosslinked network, fundamentally altering the material's moisture absorption characteristics while maintaining mechanical strength.
2Strength
If starch composite particles are used as paper strengthening agent, then mechanical strength is improved, but moisture resistance is insufficient in high humidity environments
Solution Approach 1:
The invention creates a composite material system where starch serves as the base matrix, plasticizer provides flexibility and processability, and crosslinking agent forms a resistant network. This multi-component composite approach allows simultaneous achievement of mechanical strength and moisture resistance that single-component starch cannot provide.
Solution Approach 2:
The crosslinking agent is distributed within the starch composite particles, creating local crosslinked regions throughout the material. These localized crosslinked structures provide moisture resistance at the particle level, which collectively enhances the overall moisture resistance of the paper product while maintaining the bulk mechanical properties provided by the starch matrix.
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 composite body achieves excellent moisture resistance and mechanical strength, maintaining structural integrity even in high-humidity conditions, making it suitable for applications like buffers and paper products.
Implementation Method 1
starch imparted with thermoplasticity by the plasticizer
Implementation Method 2
the crosslinking agent forms crosslinking structures between the fibers and the starch, between the fibers, and between the starch and the starch
Data Source
AI summary
A composite body includes starch composite particles containing starch, a plasticizer, and a crosslinking agent, and fibers, the starch composite particles being dispersed between the fibers.