Polyhydroxyfunctional Polysiloxanes for Persistent Anti-adhesive Coatings
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Solution Overview
Problem
Existing coating materials, polymeric molding compounds, and thermoplastics lack effective anti-adhesive and dirt-repellent properties that persist over time, especially when exposed to outdoor weather and multiple cleaning cycles without compromising other properties.
Innovation Solution
The production of polyhydroxy-functional polysiloxanes by adding branched dendritic polyhydroxy-functional allyl polyethers to Si-H-functional alkyl polysiloxanes, which are then incorporated into coating materials and thermoplastics, providing excellent anti-adhesive and dirt-repellent properties without affecting other physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating materials and polymeric molding compounds are used, then basic protective properties are maintained, but anti-adhesive and dirt-repellent effects are insufficient and do not persist over time
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating material by incorporating polyhydroxy-functional polysiloxanes with specific molecular structures (containing Si-O-Si bonds and hydroxy groups). This chemical parameter change enables the coating to form a cross-linked network structure that provides persistent anti-adhesive and dirt-repellent properties over time, resolving the contradiction between maintaining basic protection and achieving long-lasting special effects.
Solution Approach 2:
The invention creates a composite coating system by combining polyhydroxy-functional polysiloxanes with other coating components. The polysiloxane forms a distinct phase within the coating matrix that provides the anti-adhesive and dirt-repellent functionality, while the overall composite structure maintains film integrity and durability. This composite approach allows the special effects to persist without compromising the coating's protective function.
2Reliability
If additives are added to improve anti-adhesive properties, then dirt-repellent effect is enhanced, but other properties of the coating materials may be impaired
Solution Approach 1:
The polyhydroxy-functional polysiloxane concentrates the anti-adhesive functionality in specific local regions within the coating - at the coating-substrate interface and at the coating surface. The hydroxy groups and siloxane structures create localized hydrophilic zones that repel dirt and prevent adhesion, while the rest of the coating matrix maintains its protective and aesthetic properties. This localized functional distribution resolves the contradiction between enhancing anti-adhesive properties and preserving overall coating performance.
3Quantity of substance
If small amounts of additives are used, then the effectiveness should be maximized, but the concentration must be optimized to avoid affecting physical properties
Solution Approach 1:
The polyhydroxy-functional polysiloxane is designed to undergo preliminary chemical reactions during coating application and curing - specifically, the hydroxy groups form hydrogen bonds and the Si-H groups undergo condensation reactions to create a cross-linked network. This preliminary structural organization at low concentrations maximizes the anti-adhesive effectiveness per unit of additive, allowing small amounts (0.1-10% by weight) to provide sufficient functional effect without compromising the coating's physical 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 resulting materials exhibit long-lasting anti-adhesive and dirt-repellent effects even after multiple cleaning cycles and exposure to outdoor weather, maintaining their original properties such as corrosion protection, gloss retention, and weather resistance.
Implementation Method 1
The present invention relates to polyhydroxy-functional polysiloxanes, which can be produced by the addition of polyhydroxy-functional allyl polyethers to alkyl hydrogen siloxanes
Data Source
AI summary
The invention relates to polyhydroxyfunctional polysiloxanes that can be produced by adding at least one branched polyhydroxyfunctional allyl polyether to a Si-H-functional alkyl-polysiloxane. The invention also relates to a method for producing said polyhydroxyfunctional polysiloxanes, to their uses as additives in coating agents, polymer moulding masses or thermoplastics and coating agents, polymer moulding masses and thermoplastics containing them.