Fluorinated Organosilicon Polyester Coating for Stain Resistance
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Solution Overview
Problem
Existing polyester coatings fail to effectively inhibit outdoor stains and rainfall-induced stains for an extended period, with known techniques requiring high amounts of silane compounds, leading to insufficient hydrophilization, short pot life, and compromised curability, compatibility, and processability.
Innovation Solution
A polyester coating composition incorporating a fluorine-containing organosilicon compound with 5-30% fluorine content, an aliphatic hydrocarbon compound or alkoxy compound, and an organic solvent, which enhances hydrophilization and extends pot life, while reducing fluorine content and improving stain resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of silane compound is used to make the coating film surface hydrophilic, then the stain deposition inhibiting property is improved, but the curability, compatibility, re-coatability, storage stability, pot life, anti-floating property, defoaming property, workability, and processability deteriorate
Solution Approach 1:
The patent introduces fluorinated organosilicon compounds with specific fluorine content (5-30% by mass) and specific molecular structures (formula I) to change the chemical parameters of the hydrophilizing agent. This allows achieving sufficient surface hydrophilization with smaller amounts, thereby avoiding the negative effects of excessive silane compound usage while maintaining excellent stain deposition inhibiting properties
Solution Approach 2:
The patent combines fluorinated organosilicon compounds with polyester resins and other coating components to create a composite coating system. The fluorinated organosilicon compound acts as a specialized additive that provides hydrophilic functionality without compromising the overall performance of the coating system, resolving the contradiction between stain resistance and other coating properties
2Reliability
If a fluorine-containing silicate compound modified with fluorine is used to exhibit hydrophilic property from an initial stage, then the stain deposition inhibiting property is improved, but the pot life is shortened and hydrolysis occurs before coating due to condensation
Solution Approach 1:
The patent carefully controls the fluorine content parameter of the organosilicon compound within 5-30% by mass and selects specific molecular structures (formula I) that balance hydrophilic functionality with hydrolytic stability. This parameter optimization allows the compound to provide initial hydrophilic property while maintaining adequate pot life and preventing premature condensation
Solution Approach 2:
The fluorinated organosilicon compound acts as an intermediary that provides hydrophilic functionality without triggering rapid hydrolysis and condensation. The specific fluorine substitution pattern and molecular structure serve as a mediator between the desired surface hydrophilization and the need for stable storage and extended pot life
3Reliability
If the fluorine content of the organosilicon compound is increased to improve hydrophilic property, then the stain resistance is improved, but the hydrolyzability decreases and pot life is shortened
Solution Approach 1:
The patent identifies and controls the critical parameter of fluorine content within the optimal range of 5-30% by mass. This parameter optimization ensures sufficient fluorine substitution to provide hydrophilic property while preventing excessive fluorine content that would reduce hydrolyzability and shorten pot life. The specific molecular structure (formula I) further fine-tunes this balance
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 composition effectively inhibits outdoor stains and rainfall-induced stains, extends pot life, and maintains transparency and chemical resistance, ensuring improved durability and processability of the coating film.
Implementation Method 1
hydrolyzability
Implementation Method 2
making a coating film surface hydrophilic, thus making hydrophobic stains to be hardly deposited
Data Source
AI summary
There is provided a polyester coating composition having excellent action of preventing deposition of outdoor stain and stain caused by rainfall, being capable of extending a period of time (pot life) from the mixing to the coating, and comprising (A) a polyester resin, (B) one or more of fluorine-containing organosilicon compounds having a fluorine content of 5 to 30% by mass, (C) one or more of aliphatic hydrocarbon compounds having hydroxyl group and 1 to 10 carbon atoms, in which a part of hydrogen atoms bonded to carbon atom may be substituted by fluorine atoms and/or one or more of alkoxy compounds having 2 to 10 carbon atoms, in which a part of hydrogen atoms bonded to carbon atom may be substituted by fluorine atoms, and (D) an organic solvent.