Silicone Self-Healing Coatings Adhesion Repair

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Solution Overview

Problem

Silicone-based protective materials face adhesion loss and moisture ingress issues when damaged, as current commercial solutions fail to effectively maintain adhesion and prevent moisture penetration at the material/substrate interface.

Innovation Solution

Incorporation of dual microcapsules containing silicone-based resin and curing formulations into protective materials, which rupture upon damage to initiate a hydrosilylation reaction, forming a cured film that restores adhesion and prevents moisture ingress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If silicone-based protective materials are used for their hydrophobicity and flexibility, then protection against moisture and thermal cycling is improved, but adhesion to substrates deteriorates

Engineering Contradiction:

Improveprotection against moisture and thermal cyclingVSAvoidadhesion to substrates

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent introduces adhesion promoters as intermediary substances between the silicone-based protective material and the substrate. These promoters chemically bond to both the silicone matrix and the substrate surface, creating a bridging layer that transfers stress and prevents delamination. This resolves the contradiction by providing a mediating interface that maintains both the hydrophobic/flexible properties of silicone and strong adhesion to diverse substrates.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite material system combining silicone polymers with adhesion promoter molecules integrated into the matrix. This composite structure allows the material to simultaneously exhibit the desired hydrophobicity and flexibility of silicone while the incorporated adhesion promoters provide strong bonding to substrates, thus resolving the contradiction between protective performance and adhesion strength.

Inventive Principle:

Principle #40Composite materials

2Strength

If adhesion promoters are incorporated to improve adhesion, then adhesion strength is improved, but moisture ingress at damage sites increases

Engineering Contradiction:

ImproveadhesionVSAvoidmoisture ingress

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent incorporates hydrophobic agents and corrosion inhibitors into the protective material formulation before application. These substances are pre-positioned within the matrix and adhesion promoter layers, ready to migrate to damage sites and provide immediate protection. This preliminary action ensures that when damage occurs, the harmful effects of moisture ingress are already counteracted by the pre-placed protective substances.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The protective material system is designed to self-protect at damage sites through the release of incorporated hydrophobic agents and corrosion inhibitors. When the material is damaged, these substances automatically migrate to the exposed interface and form protective barriers, enabling the material to self-service its own protection function without external intervention, thus maintaining adhesion while preventing moisture ingress.

Inventive Principle:

Principle #25Self-service

3Reliability

If mechanical properties are improved to decrease damage likelihood, then damage resistance is improved, but the material becomes more brittle

Engineering Contradiction:

Improvedamage resistanceVSAvoidmaterial flexibility

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent optimizes the molecular weight distribution, crosslink density, and polymer chain architecture of the silicone matrix to achieve an optimal balance between toughness and damage resistance. By carefully controlling these compositional parameters, the material achieves enhanced damage resistance through improved cohesive strength while maintaining the flexibility and elasticity characteristic of silicone, thus resolving the contradiction between damage resistance and material stability.

Inventive Principle:

Principle #35Parameter changes

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 self-healing composition effectively maintains adhesion to substrates and prevents corrosion by releasing healing agents from microcapsules upon damage, enhancing the durability and longevity of protective coatings and sealants in corrosive environments.

Implementation Method 1

rupture upon damage to initiate a hydrosilylation reaction, forming a cured film that restores adhesion

Methodology Applied

Scientific EffectHydrosilylation reaction: Chemical Bonding

Data Source

PatentUS11746243B2Silicone-based protective formulations

Publication Date: 2023.09.05 NO CORROSION LLC

AI summary

Self-healing compositions, method of preparation and uses thereof are disclosed. In an example, a self-healing composition includes a first microcapsule and a second microcapsule. The first microcapsule includes a first polydimethylsiloxane resin, a first silicone fluid, a first functionalized alkoxysilane, and a catalyst capable of catalyzing hydrosilylation reactions, and the second microcapsule includes a second polydimethylsiloxane resin, a second silicone fluid, a second functionalized alkoxysilane, and a hydrogen-terminated dimethyl siloxane resin. In this way, the self-healing composition releases and mixes contents of the first microcapsule and the second microcapsule upon the rupture thereof, imparting a passively initiated repair process to the self-healing composition.