Random Polypropylene Copolymer Additive Coating
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Solution Overview
Problem
Random propylene copolymers with high comonomer content face stickiness issues during processing, leading to agglomeration and system blockages in polymerization facilities, particularly before being extruded into pellets.
Innovation Solution
A method involving a two-reactor system where a propylene polymer or copolymer is produced, with a significant portion transferred between reactors to enhance comonomer content, followed by surface coating with an additive after polymerization to reduce stickiness and improve flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the comonomer content is increased to improve flexibility and impact strength, then the mechanical properties are improved, but the stickiness problem worsens leading to agglomeration and blockages
Solution Approach 1:
An additive is introduced as an intermediary substance between the sticky copolymer powder and the processing equipment surfaces. This additive coats the powder particles, preventing direct contact and adhesion to equipment surfaces, thereby eliminating the harmful stickiness effect while preserving the high comonomer content needed for improved mechanical properties
Solution Approach 2:
The surface properties of the copolymer powder are changed by applying an additive coating. This modifies the surface parameters (such as surface energy and friction characteristics) to reduce stickiness, allowing the bulk material to maintain its desired mechanical properties with high comonomer content
2Ease of operation
If the comonomer content is increased to improve flexibility, then the material softness is improved, but the stickiness problem worsens causing sheeting in transfer lines
Solution Approach 1:
The additive acts as a mediator that prevents the flexible, sticky copolymer powder from adhering to equipment surfaces. By coating the particles, it allows the material to maintain its flexibility while preventing the sheeting phenomenon in transfer lines and hoppers
Solution Approach 2:
The surface parameters of the copolymer are modified through additive treatment, changing the friction and adhesion characteristics to prevent sheeting while preserving the bulk flexibility achieved through high comonomer content
3Illumination intensity
If the comonomer content is increased to improve optical properties, then the clarity is improved, but the stickiness problem worsens leading to system blockages
Solution Approach 1:
The additive serves as a protective intermediary that coats the clear, sticky copolymer powder, preventing it from adhering to equipment surfaces and causing blockages in the conveying system, while allowing the optical properties to be maintained
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 additive treatment significantly reduces stickiness and enhances the flowability of the random propylene copolymer powder, preventing agglomeration and system blockages, thereby improving processing efficiency.
Implementation Method 1
the produced random propylene copolymer (R-PP) is provided with an additive (A)... the produced random propylene copolymer (R-PP) must be surface coated with an additive after the polymerisation
Data Source
AI summary
Method for the preparation of a sticky random propylene copolymer (R-PP) in a reactor facility comprising in series (i) a first reaction system, (ii) a first conveying line connecting the first reactor system with a second reactor system comprising an outlet, (iii) a second conveying line connecting the outlet with a purge bin comprising a feeder, and (iv) a conveying system being connected with the feeder, and the preparation of said random propylene copolymer (R-PP) comprises the steps in the order of (a) producing in said first reactor system a propylene homopolymer (H-PP) or a random propylene copolymer (R-PP1), (b) transferring at least a part of said polypropylene to said second reactor system via the first conveying line, (c) producing in said second reactor system a random propylene copolymer (R-PP2) obtaining the random propylene copolymer (R-PP), (d) discharging said random propylene copolymer (R-PP) from said second reactor system via the outlet, (e) transferring said discharged random propylene copolymer (R-PP) via the second conveying line to said purge bin comprising said feeder, and (f) transferring further said discharged random propylene copolymer (R-PP) from said purge bin via said feeder to said conveying system, the produced random propylene copolymer (R-PP) is provided with an additive, said additive is fed to the produced random propylene copolymer (R-PP) (α) at the outlet of the second reactor system, or (β) at the feeder (F) of the purge bin (PB).