Plasma Polymerized Protective Coating Adhesion Wear
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Solution Overview
Problem
Existing plasma polymerization protective coatings suffer from poor adhesion to substrates and inadequate wear resistance, leading to loss of protective function upon external friction.
Innovation Solution
A protective coating is formed by plasma polymerization using a combination of monomers A and B, where monomer A includes a silicon structural unit and an amine group, and monomer B includes a terminal carboxyl group, resulting in strong adhesion and improved wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorocarbon resin protective coating is prepared by plasma polymerization using fluorinated compound as monomer, then the coating provides good corrosion protection and is economical, but the adhesion between coating and substrate is poor
Solution Approach 1:
The patent uses a composite monomer system containing both fluorinated compounds (for corrosion resistance) and silane compounds (for adhesion). The silane component forms strong chemical bonds with the substrate while the fluorinated component provides the protective corrosion-resistant coating properties, thus resolving the contradiction between adhesion and corrosion protection.
Solution Approach 2:
The patent modifies the chemical composition parameters of the monomer mixture by introducing silane compounds with specific functional groups that enhance substrate interaction. This parameter change in monomer composition enables simultaneous achievement of strong adhesion and effective corrosion protection.
2Ease of manufacture
If conventional plasma polymerization coating is applied, then the coating process is simple and economical, but the wear resistance of the coating is insufficient
Solution Approach 1:
The patent employs composite monomers combining fluorinated and silane components, where the silane portion creates a cross-linked network structure that significantly enhances wear resistance while maintaining the simplicity of the plasma polymerization process. This composite approach improves wear resistance without complicating the manufacturing process.
Solution Approach 2:
The patent introduces local structural variations within the coating by incorporating silane units that form cross-linked regions. These localized cross-linked structures provide enhanced wear resistance at the coating-substrate interface and within the coating matrix, while the overall coating process remains simple and economical.
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 coating exhibits enhanced adhesion to the substrate and superior wear resistance, maintaining its protective function even under friction and in damp or underwater conditions.
Implementation Method 1
a first coating formed on a surface of a substrate by plasma polymerization deposition when the substrate contacts plasmas
Implementation Method 2
the plasma chemical vapor deposition uses plasma to activate reaction monomer gas to deposit on a surface of a substrate
Data Source
AI summary
A protective coating is provided, including a first coating formed on a surface of a substrate by plasma polymerization deposition when the substrate contacts plasmas. The plasmas include a plasma of a monomer A and a plasma of a monomer B, wherein the monomer A includes both a silicon structural unit of formula (I) and at least one amine group structural unit of formula (II) or formula (III); and monomer B includes a terminal carboxyl group structural unit. Further disclosed is a preparation method of the protective coating, the method includes: providing a substrate, gasifying monomers including the monomer A and the monomer B and then introducing the monomers into a plasma reactor, performing a plasma discharge, and forming the first coating on the surface of the substrate by plasma polymerization. Further disclosed is a device, which is provided with the protective coating on at least part of the surface thereof.