EPS Waste Paint Process Using Solvent Dissolution and Pigment Dispersion
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Solution Overview
Problem
The disposal of expanded polystyrene (EPS) waste poses environmental concerns due to its large volume and lack of effective recycling methods, with existing processes either exporting it or sending it to landfills, and current methods for converting EPS into paints do not achieve the desired properties of glossiness and water impermeability.
Innovation Solution
A process involving mixing EPS waste with an organic solvent, decanting impurities, dispersing a pigment, and adding a dispersing agent to create a paint with specific solvent and pigment concentrations, resulting in a glossy and waterproof paint suitable for various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EPS waste is dissolved in organic solvents using conventional methods, then a coating material can be obtained, but the desired properties of glossiness and water impermeability are not achieved
Solution Approach 1:
The patent applies parameter changes by systematically varying the concentration ratios of organic solvents (toluene, xylene, acetone) and the types of dispersing agents used. By optimizing these parameters - specifically using a solvent mixture with controlled ratios and adding dispersing agents at specific concentrations - the paint achieves desired glossiness and water impermeability properties that conventional single-solvent methods cannot achieve.
Solution Approach 2:
The patent employs composite materials by combining multiple organic solvents (toluene, xylene, acetone) in specific ratios rather than using a single solvent. Additionally, it combines EPS waste with dispersing agents (such as polyacrylates or soy lecithin) to create a composite paint formulation that achieves superior performance properties including glossiness and water impermeability.
2Object-affected harmful factors
If EPS waste is disposed of in landfills or exported, then environmental contamination is reduced, but transportation costs and landfill space requirements increase
Solution Approach 1:
The patent converts the harmful waste material (EPS) into a beneficial product (paint). By dissolving EPS waste in organic solvents and adding dispersing agents, the process transforms an environmental burden into a valuable coating material with useful properties like glossiness and water impermeability, thereby eliminating the need for costly transportation and landfill disposal.
Solution Approach 2:
The patent implements discarding and recovering by collecting EPS waste that would otherwise be discarded in landfills or exported, and recovering its value through dissolution and reformulation into paint. This process retrieves useful material from waste streams, converting discarded EPS into a functional paint product.
3Loss of substance
If EPS waste is used as paint material, then waste disposal problems are solved, but the large volume of EPS requires expensive transportation
Solution Approach 1:
The patent applies phase transitions by dissolving solid EPS waste in organic solvents to transform it from a bulky solid state into a liquid solution. This phase transition from solid to liquid dramatically reduces the volume required for transportation and storage, while maintaining the mass of the material. The resulting paint solution can be easily transported and applied, solving the transportation volume problem.
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 transforms EPS waste into a paint product with high water impermeability and glossiness, reducing waste disposal issues and providing a valuable, resource-saving solution for environmental contamination.
Implementation Method 1
mixing the EPS waste with an organic solvent until reaching a mixture with a concentration between 20% and 80% w/w
Implementation Method 2
decanting impurities of the mixture obtained in stage (a) from 24 to 120 h
Implementation Method 3
dispersing a pigment in the supernatant obtained in stage (c) from 10 to 30 min at a speed between 1.000 rpm and 2.000 rpm
Data Source
AI summary
The invention is related with the paint industry to use on surfaces of solid materials. The invention is a process to obtain paints using expanded polystyrene (EPS) waste as a raw material. From this technology we pursue to transform a waste into a useful product, saving resources and at the same time contributing to solve environmental contamination problems. This invention is composed by the following stages, a.- mixing the EPS waste with an organic solvent until reaching a concentration between 20% and 80% p/p; decanting impurities of the mixture obtained in stage (a) during 24 to 120 h; c.- collecting the supernatant obtained in stage (b); d.- dispersing a pigment in the supernatant obtained in stage (c) during 10 to 30 min at a velocity between 1.000 rpm and 2.000 rpm; e.- mixing the substance obtained in stage (d) with an organic solvent at a velocity between 300 rpm and 1.000 rpm until reaching the desired concentration. Additionally, the invention claims the formulation of a paint that is formed by 0% to 40% of pigment, 70% to 1% of EPS, 0,5% to 5,0% of dispersant, and the difference is solvent.