Spread-Drying Absorbent Polymer Gel Granulate
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Solution Overview
Problem
Current drying processes for absorbent polymers often result in inhomogeneous drying, leading to unsatisfactory product quality, mechanical stress on processing devices, and the formation of toxic impurities, which are undesirable for hygiene articles.
Innovation Solution
A process that involves the polymerization of aqueous monomers, comminution of the polymer gel into gel granulate, and a controlled drying step where the gel granulate is loosened and spread to achieve uniform drying, reducing bulk density and improving physical-chemical properties while minimizing toxicological impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gel granulate is dried using conventional drying processes, then the drying efficiency can be increased, but the drying becomes inhomogeneous leading to variations in product quality and absorption properties
Solution Approach 1:
The patent applies parameter changes by controlling the drying process through specific parameters including maintaining the gel granulate at a temperature of 20°C to 150°C before drying, controlling the water content between 20-90 wt.%, and adjusting the drying conditions based on the spread behavior characteristics (compressibility index κ1 of 10-40%, decompressibility index κ1′ of 3-15%). These parameter optimizations enable both high drying efficiency and uniform drying quality simultaneously.
2Productivity
If the drying process is intensified to improve efficiency, then cost savings are achieved, but mechanical stress increases on processing devices and dust formation occurs
Solution Approach 1:
The patent applies preliminary action by preparing the gel granulate in advance through controlled polymerization and comminution processes that create optimal physical conditions (specific compressibility and decompressibility indices) before the drying step. This preliminary preparation ensures the material is pre-conditioned to dry uniformly and efficiently without requiring excessive mechanical stress during drying, thereby reducing dust formation and equipment wear.
3Manufacturing precision
If the gel layer thickness is reduced to improve drying uniformity, then the drying becomes more homogeneous, but the processing time and complexity increase
Solution Approach 1:
The patent applies self-service by utilizing the inherent spread behavior of the gel granulate during drying. The material automatically distributes itself to achieve uniform thickness through its physical properties (compressibility and decompressibility characteristics) without requiring complex external control mechanisms. This self-leveling property simplifies the drying process control while maintaining high uniformity, eliminating the need for sophisticated thickness control systems.
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 process enables efficient, uniform drying of absorbent polymers, enhancing their physical-chemical properties and reducing mechanical stress on processing equipment, resulting in high-quality absorbent polymers with minimal toxicological impurities suitable for hygiene articles.
Implementation Method 1
drying of the gel granulate... a stream of air... water must be removed from the polymer
Implementation Method 2
polymerization of various types of normally water-soluble monomers, often also together with water-insoluble co-monomers in the presence of crosslinkers
Implementation Method 3
comminution of the polymer gel to obtain a gel granulate
Data Source
AI summary
The process according to the invention for production of an absorbent polymer comprising the following process steps: i) polymerization of an aqueous monomer solution to obtain a polymer gel; ii) comminution of the polymer gel to obtain a gel granulate; and iii) drying of the gel granulate, and is characterized in that the gel granulate after step ii) has a spread behavior. The production process of an absorbent polymer distinguishes itself by a particularly efficient drying step iii), which enables a particularly gentle and uniform drying of the gel granulate. The obtained absorbent polymers and products and items produced therefrom have a particularly uniform product quality and constant physical-chemical properties.