Defoamer Composition for Water-Based Paints
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Solution Overview
Problem
Existing defoamers for water-based paints, such as organic silicon compounds, often cause wetting defects and reduced gloss due to non-uniform substrate wetting and interlayer adhesion issues, leading to defective coating films and craters.
Innovation Solution
A defoamer composition is created by reacting an alcohol, a polyalkylene glycol, and a linker, with specific mole ratios and in the presence of a base, resulting in a product that effectively reduces foam in aqueous systems without using organic solvents or volatile organic compounds (VOCs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If organic silicon compounds are used as defoamers, then foam suppression is achieved, but wetting defects and reduced gloss occur
Solution Approach 1:
The patent extracts and eliminates the harmful organic silicon compounds from the defoamer composition, replacing them with alternative defoaming agents that do not cause wetting defects or gloss reduction, thereby removing the source of the contradiction
Solution Approach 2:
The invention changes the chemical composition parameters of the defoamer by using specific ratios of silicone oil (0.1-5 wt%), polyalkylene glycol (5-20 wt%), and organic compound (70-89.9 wt%), creating a new formulation that achieves defoaming without the harmful effects of traditional organic silicon-based defoamers
2Object-generated harmful factors
If polysiloxanes are added to suppress foam, then foam reduction is achieved, but non-uniform wetting and varied film thickness occur
Solution Approach 1:
The patent modifies the composition parameters by limiting polysiloxane content to 0.1-5 wt% and combining it with specific amounts of polyalkylene glycol and organic compounds, creating a balanced formulation that maintains coating uniformity while providing effective foam suppression
Solution Approach 2:
The invention creates a composite defoamer system combining silicone oil, polyalkylene glycol, and organic compounds in specific ratios, where each component contributes to different aspects of performance, achieving both foam reduction and coating uniformity through synergistic interaction
3Object-generated harmful factors
If traditional defoamers are used, then foam control is achieved, but interlayer adhesion problems and craters appear
Solution Approach 1:
The patent removes traditional organic silicon-based defoamers that cause adhesion problems and replaces them with a modified composition using limited polysiloxane combined with polyalkylene glycol and organic compounds, eliminating the source of interlayer adhesion failure and crater 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 composition effectively reduces foam in water-based paints while maintaining a high-quality coated appearance, preventing wetting defects and ensuring uniform film thickness, thereby improving paint application and adhesion.
Implementation Method 1
The defoamer compositions can be used for reduction and/or prevention of foam or foaming in aqueous systems
Data Source
AI summary
Reaction products of an optionally alkoxylated alcohol, a polyalkylene alcohol and a linker can be used in various applications such as defoamers. Methods of making the reaction products and defoamer compositions including the reaction products, and methods of using the reaction products to reduce or prevent foam in a composition are also disclosed. The reaction products can be used with an organic solvent or without an organic solvent to provide low VOC compositions.