Polysiloxane Concentrates for Textile Care Stability
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Solution Overview
Problem
Polysiloxanes used in textile care compositions face challenges due to their hydrophobic nature, leading to formulation stability issues, phase separation, and viscosity increases during storage, which affect their practical application.
Innovation Solution
Concentrates comprising polysiloxanes, ester or mineral oils, non-ionic surfactants, non-aqueous solvents, and minimal water content, which prevent hydrolysis and enhance stability, allowing for easy self-emulsification in fabric softener formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysiloxanes are used in fabric softener formulations, then beneficial effects such as improved softness and wrinkle resistance are achieved, but formulation stability deteriorates due to phase separation and poor formability
Solution Approach 1:
The patent introduces a specific intermediary substance (polyethylene glycol with molecular weight 200-1000) that acts as a mediator between the hydrophobic polysiloxane and the aqueous fabric softener formulation. This intermediary substance enables compatible mixing and prevents phase separation, allowing the polysiloxane to maintain its fabric care performance while ensuring long-term formulation stability.
2Stability of the object's composition
If polysiloxanes are preformulated as macro- or microemulsions, then formability and storage stability are improved, but viscosity increases and shelf life decreases
Solution Approach 1:
The patent changes the formulation parameters by using a low concentration (0.1-5 wt%) of polyethylene glycol with specifically controlled molecular weight (200-1000). This parameter optimization allows the system to achieve stable emulsion formation without the excessive viscosity and gelation problems that occur with conventional macro- or microemulsion preformulations, maintaining both stability and applicability.
3Reliability
If amino-functional polysiloxanes are used, then fabric softening effects are achieved, but yellowing increases and viscosity increases during storage
Solution Approach 1:
The polyethylene glycol intermediary substance protects the amino-functional polysiloxane from environmental factors that cause yellowing and viscosity increase during storage. The intermediary forms a stable complex that prevents oxidation and degradation reactions, allowing the amino-functional polysiloxane to maintain its fabric softening performance without developing yellow color or excessive viscosity over time.
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 solution provides stable, clear concentrates that maintain improved soft feel and perfume retention for textiles, even after long-term storage, and eliminates the need for preservatives in fabric softener formulations.
Implementation Method 1
C) at least one non-ionic surfactant
Implementation Method 2
B) at least one ester or mineral oil
Data Source
AI summary
The invention relates to novel polysiloxane-containing concentrates with improved stability and improved properties of use and to their use in detergent and cleaning formulations, preferably in textile care compositions.