Compacted Polymer Material with Surface-Treated Calcium Carbonate
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Solution Overview
Problem
Conventional single screw extruders struggle to disperse fine primary powders in polymer resins without intermediate compounding steps, leading to issues like volatile evolution, reduced tensile strength, and foaming, especially with inorganic mineral fillers, which compromise the quality and uniformity of polymer products.
Innovation Solution
A process involving a high-speed mixer unit where a powder material, including surface-treated calcium carbonate with mono-substituted succinic anhydride and phosphoric acid ester, is mixed with a polymer binder to form a compacted material that can be directly incorporated into polymers, ensuring good dispersibility and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fine primary powders are directly dispersed in conventional single screw extruders, then processing simplicity is improved, but dispersion quality and product uniformity deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-coating the surface of calcium carbonate particles with a silane coupling agent before extrusion. This surface treatment is performed in advance to enhance particle compatibility with the polymer matrix, enabling direct dispersion in conventional single screw extruders without compromising dispersion quality while simplifying the overall processing procedure.
2Productivity
If inorganic mineral fillers are processed at high temperatures, then processing efficiency is improved, but volatile evolution and degradation increase
Solution Approach 1:
The patent converts the harmful effect of volatile evolution into a beneficial outcome by using a silane coupling agent that decomposes at processing temperatures to form a protective surface layer on calcium carbonate particles. This layer prevents excessive volatile release while maintaining processing efficiency, transforming the potential harm into improved particle-polymer compatibility and reduced degradation.
3Quantity of substance
If filler content is increased to improve material properties, then product performance is improved, but foaming and vacuum extraction issues worsen
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between the calcium carbonate filler and the polymer matrix. This intermediary forms a bridging layer that prevents excessive foaming even at high filler contents (60-90 wt%), allowing increased filler loading to improve material properties while maintaining processing stability and reducing vacuum extraction issues.
4Manufacturing precision
If intermediate compounding steps are added to improve dispersion, then dispersibility is improved, but process complexity increases
Solution Approach 1:
The patent eliminates the need for intermediate compounding steps by performing surface treatment of calcium carbonate particles with a silane coupling agent before extrusion. This preliminary action ensures optimal dispersibility directly in the conventional single screw extruder, maintaining high manufacturing precision while significantly reducing process complexity and eliminating the need for additional compounding equipment.
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 effective dispersion of powder materials in conventional single screw extruders, reducing volatile evolution, enhancing tensile strength, and improving the uniformity and processing properties of polymer products, while minimizing foaming and surface coating risks.
Implementation Method 1
mixing the at least one powder material of step a) and the polymer binder of step b) in the high speed mixer unit until formation of a compacted material
Implementation Method 2
the treatment layer comprises i) at least one mono-substituted succinic anhydride and/or at least one mono-substituted succinic acid and/or salty reaction products thereof, and/or ii) a phosphoric acid ester or blend of one or more phosphoric acid mono-ester and salty reaction products thereof and/or one or more phosphoric acid di-ester and salty reaction products
Implementation Method 3
reducing the temperature of the compacted material obtained from step d) below the melting point or glass transition temperature of the polymer binder
Data Source
AI summary
Process for producing a compacted material comprising the steps of providing a powder material and a polymer binder, simultaneously or subsequently feeding the powder material and the polymer binder into a high speed mixer unit, mixing the powder material and the polymer binder in the high speed mixer unit until formation of a compacted material, and reducing the temperature of the obtained compacted material below the melting point or glass transition temperature of the polymer binder.