Low-Temperature Fast Curing Coating Composition
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Solution Overview
Problem
Current alkoxysilyl-containing silane and siloxane compounds have low cure rates and produce brittle coatings with insufficient mechanical properties, failing to provide effective crack resistance and alkali resistance.
Innovation Solution
A low-temperature, fast curing coating composition is developed using an organosiloxane obtained from the hydrosilylation reaction of an organohydrogensiloxane with an alkenyl-containing alkoxysilane, combined with an organometallic catalyst, particularly titanium, to create a fully reactive film with improved crack resistance and alkali resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alkoxysilyl-containing silane or siloxane compounds are used, then the coating can be formed with heat resistance and weather resistance, but the cure rate is low and the coating is brittle with insufficient mechanical properties
Solution Approach 1:
The patent changes the chemical structure parameters of the siloxane compound by introducing a cyclic structure with multiple alkoxysilyl groups per molecule. This structural parameter change increases the number of reactive sites, thereby accelerating the cure rate while maintaining the heat and weather resistance properties inherent to siloxane networks.
Solution Approach 2:
The patent creates a composite curing system by combining the cyclic alkoxysilyl-containing siloxane compound with specific catalysts (tin, titanium, or aluminum compounds). This composite approach synergistically enhances both the cure rate and the mechanical properties of the coating while preserving its thermal and weather resistance.
2Reliability
If conventional alkoxysilyl-containing silane or siloxane compounds are used, then the coating can be formed with heat resistance and weather resistance, but the coating is brittle and has insufficient mechanical properties
Solution Approach 1:
The patent modifies the molecular structure parameters by using a cyclic siloxane backbone with multiple pendant alkoxysilyl groups. This structural change enables the formation of a more robust three-dimensional crosslinked network, significantly improving mechanical strength and crack resistance while maintaining thermal stability and weather resistance.
Solution Approach 2:
The patent employs a composite material strategy by combining the uniquely structured cyclic siloxane compound with specific metal catalysts. This composite system produces a cured coating that simultaneously achieves enhanced mechanical properties and retained heat/weather resistance, resolving the contradiction between durability and strength.
3Productivity
If low-molecular-weight alkoxysilyl-containing silane such as tetramethoxysilane is used, then the coating cures quickly within 15 minutes, but the coating is brittle and has mechanical properties insufficient to withstand use as coating film
Solution Approach 1:
The patent changes the molecular architecture from a simple low-molecular-weight linear structure to a cyclic structure with multiple reactive alkoxysilyl groups. This structural parameter change maintains fast curing kinetics (comparable to tetramethoxysilane) while dramatically improving mechanical strength and crack resistance through enhanced network formation.
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 composition exhibits fast curing ability at low temperatures, achieving crack resistance and alkali resistance, with the cyclic siloxane structure enhancing these properties, allowing the film to cure within minutes and withstand environmental challenges.
Implementation Method 1
an organosiloxane obtained or obtainable from hydrosilylation reaction of an organohydrogensiloxane having at least two hydrosilyl groups per molecule with an alkenyl-containing alkoxysilane
Implementation Method 2
a coating composition comprising (A) an organosiloxane... and (B) an organometallic catalyst
Implementation Method 3
alkoxysilyl-containing silane and siloxane compounds are widely used in paint and coating applications. When these alkoxysilyl-containing siloxane compounds are blended with curing catalysts, alkoxy groups react at normal temperature to form a siloxane network
Data Source
AI summary
A coating composition comprising (A) an organosiloxane obtained from hydrosilylation reaction of an organohydrogensiloxane having at least two hydrosilyl groups with an alkenyl-containing alkoxysilane, and (B) an organometallic catalyst is fast curable at low temperature. The cured coating is crack resistant.