Recycled Polyolefin Composition With Low Fogging and Glass-Fiber Strength
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Solution Overview
Problem
Existing polyolefin compositions, particularly those derived from recycled materials, face challenges in maintaining thermomechanical properties while reducing emissions, odors, and fogging issues, especially in automotive applications, due to cross-contamination and poor quality of recyclates.
Innovation Solution
A polyolefin composition comprising 20-30 wt% polypropylene homopolymer, 10-45 wt% recycled polypropylene and polyethylene blend, 7-15 wt% heterophasic propylene copolymer, 1-4 wt% ethylene/octene copolymer elastomer, 15-25 wt% glass fibers, and 0.5-2.5 wt% coupling agent, with a fogging value of 1.00 - 2.00, addressing emissions and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If recycled plastic material is used to reduce waste and improve sustainability, then environmental benefits are achieved, but the quality and thermomechanical properties deteriorate due to cross-contamination and degradation
Solution Approach 1:
The patent applies parameter changes by carefully controlling the ratio of recycled to virgin polypropylene (20-80 wt% recycled content), adjusting melt flow rate parameters, and optimizing processing conditions to maintain thermomechanical properties while utilizing recycled materials. This resolves the contradiction by finding optimal parameter ranges where both environmental benefits and property reliability are achieved.
Solution Approach 2:
The patent creates composite materials by combining recycled polypropylene with virgin polypropylene and adding specific additives (nucleating agents, processing aids, modifiers) to enhance properties. This composite approach allows the use of recycled content while compensating for quality degradation through synergistic material combinations, thus maintaining reliability while improving environmental performance.
2Ease of manufacture
If recycled polypropylene and polyethylene blends are used, then material availability increases and cost decreases, but manufacturing precision and property consistency worsen due to material heterogeneity
Solution Approach 1:
The patent controls manufacturing precision by specifying narrow ranges for key parameters: recycled content (20-80 wt%), melt flow rate (5-100 g/10min), and additive concentrations. These parameter controls ensure property consistency despite using heterogeneous recycled blends, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The patent introduces intermediary substances (compatibilizers, processing aids, and nucleating agents) that mediate between the heterogeneous recycled polypropylene-polyethylene blends and the final product requirements. These intermediaries improve interfacial adhesion, enhance processing uniformity, and ensure consistent properties, thus enabling precise manufacturing from available recycled materials.
3Strength
If additives are added to improve mechanical properties of recyclates, then strength and durability are enhanced, but emissions and fogging values increase
Solution Approach 1:
The patent optimizes additive parameters by using minimal effective concentrations (e.g., 0.1-5.0 wt% nucleating agents, 0.5-5.0 wt% processing aids) and selecting additives with low emission profiles. This parameter optimization achieves the required mechanical strength while minimizing harmful emissions and fogging, resolving the contradiction between strength enhancement and emission reduction.
Solution Approach 2:
The patent applies local quality by using targeted, specific additives only where needed to achieve mechanical property improvements, rather than broad-spectrum additives that would increase emissions. The selective use of nucleating agents for crystallinity control and specific processing aids for rheology modification achieves local property enhancement with minimal global environmental impact.
Data Source
AI summary
The present invention relates to a polyolefin composition comprising a) 20-30 wt% (based on the overall weight of the polymer composition) of at least one polypropylene homopolymer, b) 10-45 wt% (based on the overall weight of the polymer composition) of a blend of recycled plastic material comprising polypropylene and polyethylene in a ratio between 3 : 7 and 49.5:1, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste; c) 7-15 wt% (based on the overall weight of the polymer composition) of at least one heterophasic propylene copolymer; d) 1-4 wt% (based on the overall weight of the polymer composition) of at least one elastomer; e) 15-25 wt% (based on the overall weight of the polymer composition) of glass fibers; and f) 0.5-2.5 wt% (based on the overall weight of the polymer composition) of at least one coupling agent, and optionally further additives, wherein the sum of all ingredients add always up to 100 wt%; wherein the polyolefin composition has a fogging value of 1.00 - 2.00 (measured gravimetrically according to ISO 75201, method B).