Heat-Treated Waste Coffee Grounds in Polyolefin Resin
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Solution Overview
Problem
Conventional methods for recycling waste coffee grounds into vehicle interior materials face issues such as low-molecular-weight material emissions, odor generation, VOC emissions, and surface defects due to UV exposure, limiting their application in unpainted parts and causing environmental concerns from landfill disposal and incineration.
Innovation Solution
A polyolefin-based resin composition incorporating heat-treated waste coffee grounds with a volatile matter content less than 20 wt%, modified polypropylene, inorganic filler, and thermoplastic elastomer, which reduces gas generation and odor emissions, and provides good light resistance for use in unpainted parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If waste coffee grounds are used directly in resin composition, then recycling efficiency is improved, but low-molecular-weight materials are discharged causing VOC emissions and odors
Solution Approach 1:
The patent applies preliminary action by heat-treating waste coffee grounds before incorporating them into the resin composition. This pre-treatment removes low-molecular-weight materials that cause VOC emissions and odors during subsequent processing, while preserving the recycling benefit of using waste coffee grounds as a filler material.
Solution Approach 2:
The patent changes the physical and chemical parameters of waste coffee grounds through heat treatment, specifically reducing the volatile matter content and removing low-molecular-weight materials. This parameter change transforms the coffee grounds from a state that emits VOCs to one that is compatible with resin processing while maintaining recycling efficiency.
2Loss of substance
If waste coffee grounds are used in resin composition, then material recycling is improved, but low-molecular-weight materials bloom on surface causing odor and blooming phenomenon
Solution Approach 1:
The patent removes low-molecular-weight materials from waste coffee grounds through heat treatment before incorporating them into the resin composition. This preliminary action prevents the blooming phenomenon and surface defects that would otherwise occur during molding and processing, ensuring good surface quality while maintaining recycling benefits.
Solution Approach 2:
The patent changes the compositional parameters of waste coffee grounds by reducing low-molecular-weight material content through heat treatment. This parameter change eliminates the cause of surface blooming and odor issues, allowing the recycled coffee grounds to be used in applications requiring good surface quality.
3Manufacturing precision
If conventional washing with organic solvent is used to remove low-molecular-weight materials, then removal efficiency is improved, but harmful chemical materials are used
Solution Approach 1:
The patent replaces the chemical washing method with a thermal treatment method. Instead of using organic solvents to remove low-molecular-weight materials, the patent uses heat treatment to evaporate and remove these materials, substituting a mechanical/thermal process for a chemical process and eliminating harmful chemical usage.
Solution Approach 2:
The patent changes the treatment parameter from chemical concentration (solvent-based washing) to temperature (heat treatment). This parameter change achieves effective removal of low-molecular-weight materials without introducing harmful chemicals into the process.
4Object-generated harmful factors
If waste coffee grounds are carbonized by heat during processing, then volatile matter is reduced, but carbonized particles remain acting as foreign substance causing poor appearance
Solution Approach 1:
The patent optimizes the heat treatment parameters to achieve a balance: sufficient heat treatment to reduce volatile matter content and remove low-molecular-weight materials, but controlled temperature and duration to prevent excessive carbonization that would create visible black particles. This parameter optimization resolves the contradiction between volatile matter reduction and appearance quality.
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 composition effectively reduces the use of synthetic resins derived from fossil fuels, decreases VOC and odor emissions, and enhances light resistance, enabling the use of recycled waste coffee grounds in vehicle interior materials without surface defects.
Implementation Method 1
heat-treated waste coffee grounds that have undergone heat treatment to remove volatile matter
Implementation Method 2
waste coffee grounds that have undergone heat treatment to remove volatile matter
Implementation Method 3
low-molecular-weight materials such as cellulose, hemicellulose and the like bloom on the surface of the parts when exposed to UV radiation
Data Source
AI summary
Disclosed is a polyolefin-based resin composition for a vehicle interior material including heat-treated waste coffee grounds. The resin composition includes a polyolefin-based resin, waste coffee grounds including a volatile matter (VM) in an amount less than about 20 wt % of the waste coffee grounds, a modified polypropylene, an inorganic filler, and a thermoplastic elastomer.