Recycled EVA Composite Formulation for Tougher Resin Articles
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Solution Overview
Problem
Current resin articles face high raw material costs, low production efficiency, limited mold usage, and inferior surface smoothness, heat resistance, and toughness due to the use of recycled plastics like EVA, PP, PVC, and PE.
Innovation Solution
A formulation combining recycled EVA, PP, PVC, and PE plastics with stone powder or heavy calcium carbonate in specific weight percentages, mixed and heat-pressed using a hydraulic press to enhance mechanical properties and electroplating performance, while reducing material costs and pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If recycled plastics (EVA, PP, PVC, PE) are used to manufacture resin articles, then production cost is reduced and environmental pollution is decreased, but the toughness, surface smoothness, and heat resistance of the articles deteriorate
Solution Approach 1:
The patent applies composite materials by combining recycled plastics with inorganic fillers (calcium carbonate, barium sulfate, zinc oxide) and coupling agents. This composite formulation enhances the mechanical properties and heat resistance of recycled plastics while maintaining cost-effectiveness and environmental benefits. The synergistic interaction between organic polymer matrices and inorganic fillers resolves the contradiction between using low-cost recycled materials and achieving high performance.
Solution Approach 2:
The patent employs parameter changes by optimizing the ratios of different recycled plastics and additives, controlling processing temperatures, and adjusting molding parameters. Specifically, the formulation specifies weight percentages of various components (recycled plastic 30-70%, calcium carbonate 20-50%, coupling agent 1-5%) and processing conditions (heating temperature 150-250°C, pressing pressure 5-20 MPa) to achieve optimal toughness and performance while using recycled materials.
2Ease of manufacture
If recycled plastics are used to manufacture resin articles, then material cost is reduced, but the surface smoothness and heat resistance of the articles deteriorate
Solution Approach 1:
The patent uses composite materials incorporating fine inorganic fillers (calcium carbonate with particle size 0.5-5 μm, barium sulfate) that act as nucleating agents and surface modifiers. These fillers improve surface smoothness by filling micro-defects and providing a finer surface structure, while the coupling agents enhance interfacial bonding to prevent surface defects during processing.
Solution Approach 2:
The patent applies parameter changes by controlling particle size distribution of fillers (0.5-5 μm for calcium carbonate), optimizing heating temperature (150-250°C) to ensure proper melting and surface formation, and adjusting pressing pressure (5-20 MPa) to achieve dense, smooth surfaces without excessive deformation of recycled plastic particles.
3Ease of manufacture
If recycled plastics are used to manufacture resin articles, then production cost is reduced, but the heat resistance of the articles deteriorates
Solution Approach 1:
The patent employs composite materials with high-heat-resistance inorganic fillers (calcium carbonate, barium sulfate, zinc oxide) that raise the thermal stability and decomposition temperature of the recycled plastic matrix. These inorganic components act as thermal barriers and structural supports, maintaining dimensional stability and mechanical properties at elevated temperatures while keeping the formulation cost-effective.
Solution Approach 2:
The patent applies parameter changes by selecting inorganic fillers with high thermal stability, optimizing the heating temperature range (150-250°C) during processing to avoid degradation, and controlling the service temperature range to maintain heat resistance performance. The formulation and processing parameters are coordinated to achieve improved heat resistance.
4Productivity
If traditional molding processes are used for recycled plastics, then production efficiency is limited and mold usage is restricted (about 300 times), but improving toughness and surface quality requires complex processing
Solution Approach 1:
The patent applies parameter changes by optimizing processing temperatures (150-250°C) to ensure complete melting and homogenization of recycled plastic particles, controlling pressing pressure (5-20 MPa) and time to achieve proper densification and bonding, and adjusting cooling rates to minimize internal stresses. These optimized parameters improve both toughness and production efficiency while extending mold life.
Solution Approach 2:
The patent uses composite materials with coupling agents that enhance interfacial bonding between recycled plastic particles and inorganic fillers, improving toughness and reducing defects. The reinforced composite structure allows for higher processing speeds and extended mold usage without compromising product quality, thereby improving production efficiency.
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 solution improves the toughness, surface smoothness, heat resistance, and electroplating performance of resin articles, increasing production efficiency, reducing labor and material costs, and minimizing environmental impact.
Implementation Method 1
the composite is fed to a screw melting machine with electric heating, heated and further mixed
Implementation Method 2
conveyed to the steel mold of the hydraulic press according to the volume of the mold to be molded and pressed strong
Implementation Method 3
cooled in the steel mold for 5 minute to 15 minute with the recirculation of the cooling water
Implementation Method 4
with the recirculation of the cooling water to de-mold the thick composite
Data Source
AI summary
A formulation for a recycled plastic composite composition, and a method of making the composite composition, is provided. The composite composition includes recycled EVA plastic from 30% to 80%, a stone powder from 20% to 70%; percentages by weight.