Polyether Siloxane Defoamer Formulation for Coating Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing defoamers based on polyether siloxanes often exhibit compatibility issues with coating compositions, leading to defects such as sinkholes in final coatings, despite their effective defoaming performance.
Innovation Solution
A formulation comprising a polyether siloxane with a polyether terminated with an ester group, present in an amount of 0.5 to 10% by weight, which enhances compatibility without compromising defoaming abilities, particularly in water-based coating compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyether siloxane defoamers are used to achieve effective defoaming performance, then defoaming ability is improved, but compatibility with coating compositions deteriorates leading to defects such as sinkholes
Solution Approach 1:
The invention uses a composite defoamer formulation consisting of polyether siloxane combined with polyether carbonate or polyether carboxylate. This composite approach allows the defoamer to maintain effective defoaming performance while the additional polyether component improves compatibility with coating compositions, preventing defects like sinkholes that occur with pure polyether siloxane defoamers
Solution Approach 2:
The invention changes the chemical composition parameters of the defoamer by introducing polyether carbonate or polyether carboxylate components with specific molecular weight ranges (400-10,000 g/mol). This parameter modification transforms the defoamer's interaction properties with coating materials, resolving the compatibility issue while preserving defoaming effectiveness
Data Source
AI summary
The present invention relates to a formulation comprising a polyether siloxane, which is characterized in that a polyether that is terminated with an ester group and that is different from the polyether siloxane is present in the formulation in an amount of from 0.5 to 10% by weight based on the complete formulation, to a process for the production of a defoamed composition, wherein the inventive formulation is added to the composition to be defoamed, and to a composition comprising a formulation according to the invention, wherein the composition is a coating agent, a paint or a varnish.