Plastic Surface Modification via Mold Pre-Functionalization
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Solution Overview
Problem
Existing methods for modifying plastic surfaces are costly, time-consuming, and lack long-term stability and sufficient adhesion for subsequent coatings, often affecting the mechanical properties of plastics and being environmentally harmful.
Innovation Solution
A method involving applying a solution or dispersion with modifier substances and auxiliaries to the mold surface, where the modifier substances form covalent bonds with the plastic during molding, creating cavities and improving adhesion, using environmentally friendly materials and processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plasma or corona treatment is used to activate plastic surfaces, then adhesion is improved, but the process becomes time-consuming and costly
Solution Approach 1:
The mold surface is pre-modified with modifier substances before the plastic molding process. This preliminary action ensures that the plastic surface becomes activated during molding itself, eliminating the need for separate post-treatment steps like plasma or corona discharge, thus reducing process time while maintaining adhesion improvement
Solution Approach 2:
The surface activation function is merged with the molding process. The modifier substances are applied to the mold, and during the molding process, they transfer to and activate the plastic surface simultaneously with shaping the plastic, combining two operations into one
2Strength
If plasma or corona treatment is used to activate plastic surfaces, then adhesion is improved, but the effects are not permanent over long periods
Solution Approach 1:
The mold surface is pre-modified with modifier substances before the plastic molding process. This preliminary action ensures that the plastic surface becomes activated during molding itself, eliminating the need for separate post-treatment steps like plasma or corona discharge, thus reducing process time while maintaining adhesion improvement
Solution Approach 2:
The plastic surface activates itself during the molding process through contact with the modifier substances on the mold surface. The high temperature and pressure conditions during molding enable the plastic to undergo self-activation without requiring external plasma or corona treatment, creating permanent adhesion properties
3Strength
If primer is used for surface modification, then adhesion is improved, but solvents pollute the environment and the process becomes expensive
Solution Approach 1:
The chemical solvent-based primer system is replaced with a thermal and pressure-based activation system. During molding, the high temperature and pressure conditions enable direct chemical bonding between the plastic surface and the modifier substances on the mold, eliminating the need for solvent-based primers and their associated environmental pollution
Solution Approach 2:
The process utilizes changes in temperature and pressure parameters during molding to achieve surface activation. The high temperature and pressure conditions during the molding process enable the plastic surface to react with and bond to the modifier substances, replacing the need for solvent-based chemical treatments
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
This method provides a simple, cost-effective, and long-term stable surface modification with improved adhesion for subsequent coatings, maintaining the mechanical properties of plastics while being environmentally friendly.
Implementation Method 1
the modifier substances with the reactive groups forming covalent bonds with the plastic surface during the molding process
Implementation Method 2
the auxiliary substance or substances are then at least partially removed from the surface of the molded plastic to produce at least one cavity
Data Source
Figure 1A)~1C)
AI summary
The invention relates to the fields of chemistry and mechanical engineering and concerns a method for modifying plastic surfaces and modified plastic surfaces that can be used, for example, for coatings or for multi-component injection molding in the automotive industry or in mechanical engineering. The object of the present invention is to provide a method for modifying plastic surfaces that enables simple and cost-effective modification and results in long-term stable surface modifications.The object of the invention is solved by a method for modifying plastic surfaces in which at least one solution or dispersion is applied to the surface of a molding tool, followed by the removal of at least one solvent or dispersion agent from the molding tool, then at least one plastic is introduced into the molding tool as a melt, and then the additives are at least partially removed from the surface of the molded plastic.