Defoamer Composition Using Polydimethylsiloxane and Organopolysiloxane Resin
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Solution Overview
Problem
Existing defoamers based on polydimethylsiloxanes have poor compatibility with surfactant systems, leading to separation issues and limited efficacy after storage, which complicates their use in aqueous media and surfactant formulations.
Innovation Solution
A method using polydimethylsiloxanes combined with organopolysiloxane resins, fillers, nonionic emulsifiers, and solvents, excluding 2,2,4-trimethyl-1,3-diisobutyryloxypentane, to create defoamer compositions that maintain compatibility and efficacy in aqueous surfactant formulations, even after storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polydimethylsiloxanes are used as defoamers, then defoaming activity is achieved, but compatibility with surfactant systems deteriorates leading to separation
Solution Approach 1:
The invention combines polydimethylsiloxane (A) with organopolysiloxane resins (C) containing Si-O-Si backbone structures with organic side groups, creating a composite defoamer composition that maintains the defoaming activity of polydimethylsiloxane while improving compatibility with surfactant systems through the resin component. The composite structure allows synergistic effects where the resin modifies the interfacial properties to prevent separation.
Solution Approach 2:
The organopolysiloxane resin acts as an intermediary substance between the polydimethylsiloxane defoamer and the aqueous surfactant system. The resin's amphiphilic character (hydrophobic organic groups and hydrophilic Si-O-Si backbone) allows it to bridge the incompatible phases, enabling the polydimethylsiloxane to function effectively without separating from the surfactant system.
2Reliability
If polydimethylsiloxanes are used as defoamers, then defoaming efficacy is achieved, but stability after storage deteriorates
Solution Approach 1:
The composite composition of polydimethylsiloxane with organopolysiloxane resin provides long-term storage stability while maintaining defoaming efficacy. The resin component forms a stable network structure that prevents phase separation during storage, ensuring the defoamer remains effective after prolonged storage periods.
Solution Approach 2:
The invention modifies the physical and chemical parameters of the defoamer system by incorporating resins with specific molecular weights, viscosity ranges, and functional group compositions. These parameter adjustments optimize both the immediate defoaming efficacy and the long-term storage stability of the composition.
3Reliability
If conventional defoamer compositions are used, then foam control is achieved, but separation and incompatibility issues arise
Solution Approach 1:
The invention applies local quality by creating defoamer compositions with specific regional characteristics - the polydimethylsiloxane provides defoaming function at the gas-liquid interface while the organopolysiloxane resin ensures compatibility and stability in the bulk aqueous phase. This spatial-functional differentiation resolves the contradiction between foam control and compatibility.
Solution Approach 2:
The invention optimizes specific parameters including the ratio of polydimethylsiloxane to organopolysiloxane resin (typically 95:5 to 50:50 by weight), the viscosity of the polydimethylsiloxane (10-100,000 cSt), and the molecular weight of the resin, to achieve both effective foam control and compatibility with aqueous surfactant formulations.
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 compositions demonstrate excellent compatibility and long-lasting defoaming efficacy in various media with small added amounts, making them economically and environmentally viable for use in washing compositions, textile dyeing processes, and wastewater treatment.
Implementation Method 1
compositions based on polysiloxanes... comprising (A) polydimethylsiloxanes... (C) organopolysiloxane resins... (E) optionally nonionic emulsifiers... (F) mono-, di- or trialkoxyalkyl ethers
Implementation Method 2
self-emulsifying defoamers containing organopolysiloxanes... nonionic emulsifiers
Data Source
AI summary
Defoamer compositions along with methods of producing the same. Where the defoamer compositions are used to defoam an aqueous media. Where the defoamer compositions include (A) polydimethylsiloxanes of the general formula (I), (B) fillers, (C) organopolysiloxane resins formed from units of the formula (II), (D) optionally polyorganosiloxanes of the general formula (III), (E) optionally nonionic emulsifiers, (F) mono-, di- or trialkoxyalkyl ethers of the following formula (IV), (G) nonaqueous solvents other than component (F), (H) optionally an alkaline or acidic catalyst or reaction product thereof with components (A) to (F), and involvement of 2,2,4-trimethyl-1,3-diisobutyryloxypentane and polyethersiloxanes is ruled out.