Alkenyl Succinate Ester Sizing Agent for Supercritical CO₂ Desizing
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Solution Overview
Problem
Conventional adhesives used in the desizing step of fiber products require large amounts of water, leading to significant wastewater generation, which is environmentally harmful, and are not suitable for use with supercritical carbon dioxide.
Innovation Solution
The use of an adhesive comprising an alkenyl succinate ester of a starch decomposed product, such as octenyl succinate ester of dextrin or dodecenyl succinate ester of maltose, which is compatible with supercritical carbon dioxide for desizing fiber products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional starch paste adhesive is used in the desizing step, then the adhesive provides good binding properties for fiber products, but it requires large amounts of water and generates significant wastewater that is harmful to the environment
Solution Approach 1:
The invention changes the chemical parameters of the adhesive by using alkenyl succinate ester of starch decomposed product instead of conventional starch paste. This parameter change allows the adhesive to be compatible with supercritical carbon dioxide desizing, eliminating the need for large amounts of water and thereby reducing wastewater generation while maintaining adhesive binding properties
Solution Approach 2:
The invention substitutes the water-based adhesive system with a supercritical carbon dioxide-compatible adhesive system. By replacing water as the solvent with supercritical carbon dioxide, the process eliminates wastewater generation while the alkenyl succinate ester adhesive maintains its binding function in the new solvent environment
2Loss of substance
If supercritical carbon dioxide is used as solvent in the desizing step, then water usage and wastewater generation are reduced, but conventional adhesives cannot be effectively removed
Solution Approach 1:
The invention changes the adhesive composition to alkenyl succinate ester of starch decomposed product, which has different solubility parameters that make it compatible with supercritical carbon dioxide. This parameter change enables effective desizing with supercritical carbon dioxide while maintaining the benefits of reduced water usage and waste
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
This adhesive enables efficient desizing with supercritical carbon dioxide, reducing water usage and waste, while providing high durability and tensile strength to the fiber products.
Implementation Method 1
supercritical carbon dioxide has characteristics of (5) having a smaller dielectric constant than that of water, and has a dielectric constant comparable to that of a general nonpolar organic solvent, and hence becoming a favorable solvent for a nonpolar organic substance
Implementation Method 2
performing fiber processing using supercritical carbon dioxide is known. The supercritical state is exhibited in a state in excess of the critical temperature (Tc) and the critical pressure (Tp) inherent in each compound
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A fiber product with an adhesive is provided, the adhesive including an alkenyl succinate ester of a starch decomposed product.