Rotating Drum Mixing for Superabsorber Homogeneity
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Solution Overview
Problem
Existing processes for producing superabsorbers are limited by slow relaxation and homogenization of polymer structures after surface modification, leading to inhomogeneous distribution of modifying agents and increased dust content, especially when using large amounts of aqueous solutions, which can cause mechanical damage and affect absorption properties.
Innovation Solution
A process involving a rotating container for further treatment of polymer structures after contact with modifying agents, allowing for rapid and gentle mixing and distribution of agents, reducing dwell time and friction, and using a device that includes a polymerization region, drying region, and further treatment region with a rotating container to enhance production efficiency and reduce dust content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mixing devices are used for surface modification of superabsorbers, then the superabsorbers can be treated with modifying agents, but the superabsorbers form lumps and show inhomogeneous distribution of the treatment agent
Solution Approach 1:
The patent employs a rotating drum mixer that continuously tumbles the superabsorber particles during treatment with aqueous modifying agents. This dynamic mixing approach prevents lump formation by constantly redistributing particles, ensuring homogeneous treatment agent distribution while maintaining good flowability of the treated superabsorbers.
Solution Approach 2:
The patent replaces conventional intensive mechanical mixing systems with a gentle rotational tumbling system. The rotating drum provides mild mechanical action that avoids particle damage and lump formation, achieving homogeneous distribution of treatment agents through prolonged gentle mixing rather than intense mechanical force.
2Manufacturing precision
If intensive mixing is used to achieve uniform treatment agent distribution, then homogeneity is improved, but mechanical damage to superabsorbers occurs and dust content increases
Solution Approach 1:
The rotating drum mixer provides continuous gentle tumbling motion that achieves homogeneous treatment agent distribution without intensive mechanical stress. This dynamic approach distributes particles evenly over time while avoiding the high-shear forces that generate dust and cause particle fragmentation.
Solution Approach 2:
The patent substitutes conventional intensive mechanical mixers with a rotating drum system that uses gravity-assisted gentle tumbling. This replacement eliminates the need for high-intensity mechanical mixing, achieving uniform treatment distribution while preventing particle damage and dust generation.
3Adaptability or versatility
If aqueous solutions are used as treatment agents for surface modification, then the modifying properties are achieved, but the superabsorbers form lumps immediately after leaving the mixing device
Solution Approach 1:
The rotating drum mixer continuously tumbles the superabsorber particles during and after treatment with aqueous modifying agents. This continuous dynamic motion prevents lump formation by constantly redistributing particles, allowing the use of aqueous solutions for surface modification while maintaining good flowability of the treated product.
Solution Approach 2:
The patent implements continuous mixing action in the rotating drum that extends through the entire treatment process. This continuous useful action ensures that particles remain separated and evenly distributed throughout the treatment, preventing lump formation even when aqueous solutions are used as modifying agents.
4Ease of manufacture
If conventional mixing processes are used for surface modification, then the treatment can be applied, but the relaxation and homogenization process is slow and time-consuming
Solution Approach 1:
The rotating drum mixer provides continuous dynamic tumbling action that rapidly achieves homogeneous distribution of treatment agents. This dynamic mixing process significantly reduces the dwell time required for relaxation and homogenization compared to conventional static or batch mixing processes, while maintaining process simplicity.
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 approach enables rapid and uniform distribution of modifying agents, reduces dust content, and allows for the production of high amounts of superabsorbers with improved absorption properties and flowability, overcoming the limitations of conventional methods.
Implementation Method 1
at least the further treatment in process step c) is carried out at least partly in a rotating container
Data Source
AI summary
The present invention relates to a process for the production of a superabsorber, comprising as steps providing a water-absorbing polymer structure, bringing the water-absorbing polymer structure into contact with a modifying agent, preferably a modifying agent, and the further treatment of the water-absorbing polymer structure which has been brought into contact with the modifying agent. The further treatment is carried out at least partly in a rotating container. The invention furthermore relates to a device for the production of a superabsorber, superabsorbers, a composite, a process for the production of a composite, the composites obtainable by this process, chemical products, such as foams, shaped articles or fibers, and the use of a superabsorber.