Inorganic Particle Surface Migration in Functional Plastics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antimicrobial plastics require high concentrations of additives, which can compromise their physical properties and pose safety and environmental concerns, while their antimicrobial effects are short-lived and not uniformly distributed across surfaces.
Innovation Solution
A method involving the dispersion of inorganic microparticles or nanoparticles in a low viscosity solvent, followed by extrusion with a polymer matrix, enhances their surface migration and reduces material loss, allowing for effective antimicrobial functionality at lower additive concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of antimicrobial additives are incorporated into plastics, then antimicrobial effectiveness is improved, but physical properties of the plastic are compromised and safety/environmental concerns arise
Solution Approach 1:
The patent changes the physical state and distribution parameters of antimicrobial additives by incorporating them into microparticle carriers and using low viscosity solvents. This allows the additives to be dispersed at lower concentrations while achieving uniform distribution and prolonged release, thereby maintaining antimicrobial effectiveness without compromising plastic physical properties
Solution Approach 2:
The patent introduces microparticle carriers and low viscosity solvents as intermediary substances that facilitate the transport and distribution of antimicrobial additives. These intermediaries enable the additives to migrate to the plastic surface over time, providing sustained antimicrobial activity at reduced concentrations without direct adverse effects on the plastic matrix
2Ease of manufacture
If antimicrobial additives are incorporated at early stage of production, then economic benefits and durability are improved, but excessive use increases costs and compromises intrinsic physical properties
Solution Approach 1:
The patent changes the concentration parameter by using microparticle carriers that can be incorporated at low concentrations (0.01-10% by weight). The additives are released gradually over time, providing sustained antimicrobial activity without requiring excessive quantities, thus reducing costs while maintaining durability and physical properties
Solution Approach 2:
The patent performs preliminary dispersion of antimicrobial additives in low viscosity solvents before incorporation into the plastic matrix. This preliminary action ensures uniform distribution and facilitates controlled release during the extrusion process, allowing effective antimicrobial properties with minimal additive quantities
3Ease of manufacture
If conventional mixing methods are used to distribute antimicrobial additives, then manufacturing simplicity is maintained, but uniform distribution across surfaces is not achieved
Solution Approach 1:
The patent uses low viscosity solvents as intermediaries that facilitate uniform distribution of antimicrobial additives during extrusion. The low viscosity enables the additives to migrate smoothly through the plastic matrix, achieving uniform surface distribution without requiring complex mixing equipment or processes
Solution Approach 2:
The patent exploits the hydraulic properties of low viscosity solvents during the extrusion process. The fluid nature of the solvent allows it to carry and distribute microparticle carriers uniformly through the plastic material, achieving precise distribution control while maintaining manufacturing simplicity
4Object-affected harmful factors
If antimicrobial additives are used to create inherent antimicrobial surfaces, then disease transmission and food spoilage are reduced, but the antimicrobial effects are short-lived
Solution Approach 1:
The patent performs preliminary dispersion of antimicrobial additives in low viscosity solvents before incorporation into the plastic matrix. This preliminary action ensures the additives are positioned and distributed optimally within the plastic structure, enabling prolonged release and sustained antimicrobial activity over time
Solution Approach 2:
The patent changes the release parameter by using microparticle carriers that slowly release antimicrobial additives over extended periods. The low viscosity solvent facilitates controlled diffusion and migration of additives to the plastic surface, providing long-lasting antimicrobial protection against disease transmission and food spoilage
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 method achieves enhanced surface distribution and prolonged antimicrobial efficacy of antimicrobial agents in plastics, reducing material loss and maintaining the required level of antimicrobial effectiveness with significantly lower additive quantities.
Implementation Method 1
the viscosity of the stock suspension is less than that of the polymer matrix
Implementation Method 2
an extrusion step of combining the stock suspension with a polymer matrix in an extruder
Data Source
AI summary
Described herein is a process to prepare plastic masterbatches, compounds, and compositions thereof composed of at least one plastic matrix, at least one low density solvent or low viscosity solvent, optionally at least one dispersant, and at least one type of inorganic particles. The process described herein improves and optimizes migration mechanism of particles to the surface of the compounded plastic composition and reduces the material lost, by first dispersing the inorganic particles in low density solvent or low viscosity solvent followed by extrusion in plastics matrices.