Polyurethane-Silicone Aqueous Coatings for Rubbing Fastness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous silicone dispersions used for coating substrates, particularly in the reverse coating process, face challenges in achieving long-lasting grip properties and fastness, especially rubbing fastness, on leather and textiles.
Innovation Solution
Aqueous dispersions containing a combination of polyurethane and specific silicone compounds with reactive groups, along with a polydi-C1-C4-alkylsiloxane, are formulated to enhance the coating's adhesion and durability, utilizing a combination of thermoplastic polyurethanes and silicone compounds with amino or carboxylic acid groups to improve substrate fastness and tactile properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurethane and silicone compounds with reactive groups are combined, then fastness and grip properties improve, but the formulation complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the dispersion formulation, including polyurethane content (5-50% by weight), silicone compound content (1-20% by weight), and reactive group content (0.1-10 mmol per 100g dispersion). By defining these specific parameter ranges, the patent simplifies the formulation process while ensuring optimal fastness and grip properties, transforming a complex formulation problem into a controlled parameter optimization
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 proposed solution significantly improves the fastness and grip properties of coated substrates, providing excellent breathability and feel, making them suitable for applications in furniture, automotive interiors, and textiles.
Implementation Method 1
silicone compounds with reactive groups, within the scope of the present invention also called silicone compound (C)... silicone compounds with one to four amino groups per molecule, silicone compounds with one to four aminoalkylamino groups per molecule and silicone compounds with one to four COOH groups per molecule
Data Source
AI summary
The invention relates to aqueous dispersions comprising (A) at least one polyurethane, (B) at least one compound of the general formula I a or I b (I a) (I b), wherein R1, R2 and R3 may be identical or different and are selected from A1-NCO and A1-NH-CO-X, wherein A1 is a spacer having 2 to 20 carbons atoms and X is selected as 0(AO)xR4, AO is C2-C4-alkyleneoxide, x is an integer in the range from 1 to 50, and R4 is selected from hydrogen and C1-C30-alkyl, (C) and at least one silicon compound with reactive groups.