Brushlike Organosilicon Polyurethane Coating for Anti-Icing
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Solution Overview
Problem
Existing anti-icing coatings lack strong mechanical properties and durability, and self-cleaning capabilities, making them ineffective for long-term use in icing environments.
Innovation Solution
A method for preparing a self-cleaning anti-icing coating based on brushlike organosilicon, involving a thiol-ene addition reaction, amino nucleophilic ring opening, and thiol click reactions to create a polyurethane matrix with a brushlike structure, which provides low surface energy and strong adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a super-hydrophobic structure is prepared to reduce ice adhesion, then anti-icing capability is improved, but mechanical properties and durability deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of organosilicon resin as the base matrix, combined with fluorinated compounds and silane crosslinking agents. This composite structure allows the coating to simultaneously achieve low surface energy (for anti-icing) and high mechanical strength (through crosslinking network formation), resolving the contradiction between anti-icing capability and mechanical durability
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating by incorporating specific ratios of organosilicon compounds, fluorinated compounds, and crosslinking agents. By adjusting these compositional parameters and controlling the curing process, the coating achieves optimal balance between surface energy (for ice release) and mechanical crosslinking density (for strength and durability)
2Reliability
If a super-hydrophobic structure is prepared to reduce ice adhesion, then anti-icing capability is improved, but self-cleaning capability deteriorates
Solution Approach 1:
The patent optimizes the surface energy parameters by carefully selecting and proportioning organosilicon resin with fluorinated compounds. This parameter adjustment creates a surface that is sufficiently hydrophobic to enable ice release while maintaining smoothness and chemical properties that facilitate self-cleaning through rainwash or simple mechanical contact
3Reliability
If PDMS gel is used to reduce surface energy, then anti-icing capability is improved, but mechanical properties and durability deteriorate
Solution Approach 1:
The patent creates a composite system where PDMS or similar low surface energy materials are integrated into an organosilicon resin matrix with crosslinking capability. The crosslinking network provides the mechanical strength and durability, while the PDMS components maintain low surface energy for anti-icing performance, thus resolving the contradiction between these two properties
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 excellent self-cleaning and antifouling properties with high tensile strength, elongation, and reduced ice adhesion, maintaining performance even after polishing and exposure to icing conditions.
Implementation Method 1
subjecting the first mixture to a thiol-ene addition reaction at ambient temperature for 1-3 h, to obtain the modified thiolactone
Implementation Method 2
subjecting the second mixture to an amino nucleophilic ring opening reaction and a thiol click reaction of thiolactone for 6-24 h to obtain the siloxane block
Implementation Method 3
subjecting the second mixture to an amino nucleophilic ring opening reaction and a thiol click reaction of thiolactone for 6-24 h to obtain the siloxane block
Implementation Method 4
The coating surface may become a hydrophobic surface (that is, with a contact angle of greater than 90°) by changing the chemical composition of the coating surface and reducing surface energy of the coating, so that the adhesion between ice or water (before icing) and the surface could be reduced
Implementation Method 5
placing the substrate in a drying oven and heating for 18-36 h in a gradient heating manner from 50° C. to 120° C. by using an annealing method
Implementation Method 6
heating for 18-36 h in a gradient heating manner from 50° C. to 120° C. by using an annealing method
Implementation Method 7
subjecting the substrate after heating to a vacuum drying at a temperature of 60-80° C. for 6-24 h to remove remaining solvent
Data Source
AI summary
The present disclosure relates to a method for preparing a self-cleaning anti-icing coating based on brushlike organosilicon. In this method, a brushlike organosilicon-modified polyurethane coating is prepared by subjecting a thiolactone, a diamine compound and monovinyl-terminated polydimethylsiloxane to a simple multi-component click reaction to obtain a dihydroxy-terminated block, and introducing the dihydroxy-terminated block into a polyurethane matrix.