Siloxane Oligomer Coating for Hydrophilic Surface Modification
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Solution Overview
Problem
Existing methods for imparting hydrophilic properties to materials, such as those using polyorganosiloxanes, suffer from emulsion instability and require high concentrations of oxyalkylenorganosiloxane, which limits their effectiveness.
Innovation Solution
A method involving the application and chemical fixation of a siloxane oligomer followed by a phosphonic acid compound to form an organosiloxane coating on the material surface, enhancing hydrophilicity while minimizing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyorganosiloxane is used to impart hydrophilic properties, then hydrophilic surface properties are achieved, but emulsion instability occurs causing coagulation
Solution Approach 1:
The patent uses polydiorganosiloxane as an intermediary substance to stabilize the emulsion of polyorganosiloxane. The polydiorganosiloxane acts as a surfactant that prevents coagulation while allowing the polyorganosiloxane to impart hydrophilic properties to the fibrous material surface.
Solution Approach 2:
The patent creates a composite emulsion system combining polyorganosiloxane (for hydrophilic properties) with polydiorganosiloxane (for emulsion stability). This composite approach allows both functions to coexist: the hydrophilic modification is achieved while the emulsion remains stable during processing.
2Reliability
If oxyalkylenorganosiloxane is used to provide hydrophilic properties, then hydrophilicity is improved, but large quantities (1-5% by weight) are required
Solution Approach 1:
The patent changes the chemical parameters of the siloxane compounds by selecting specific polyorganosiloxane and polydiorganosiloxane with appropriate molecular weights and structural characteristics. This optimization allows achieving the desired hydrophilic effect with reduced material quantity compared to conventional oxyalkylenorganosiloxane treatments.
3Stability of the object's composition
If polydiorganosiloxane is added to increase emulsifying ability, then emulsion stability is improved, but the complexity of the processing composition increases
Solution Approach 1:
The polydiorganosiloxane serves multiple functions simultaneously: it acts as a stabilizer to prevent emulsion coagulation and as a surfactant to improve emulsifying ability. This multi-functionality reduces the need for additional separate additives, thereby limiting the increase in processing complexity.
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 method significantly increases hydrophilicity of materials, reducing water contact angles to 15° or less, effectively preventing dew condensation and suitable for various applications including anti-fogging glasses and appliance parts.
Implementation Method 1
applying and chemically fixing a siloxane oligomer represented by Chemical Formula 1 to the surface of the base material to form a siloxane-modified surface
Implementation Method 2
applying a phosphonic acid compound represented by Chemical Formula 2 to the siloxane-modified surface and carrying out a reaction therebetween to form an organosiloxane coating
Implementation Method 3
The method significantly increases hydrophilicity of materials, reducing water contact angles to 15° or less
Data Source
AI summary
An article having a hydrophilic surface of a material, including a base material having a surface; and a siloxane oligomer represented by Chemical Formula 1 chemically affixed to the surface of the base material wherein the organosiloxane coating comprises a reaction product of a siloxane oligomer represented by Chemical Formula 1 or a polysiloxane derived therefrom, with a phosphonic acid compound represented by Chemical Formula 2:herein in Chemical Formula 1, R1, R2, and R3 are the same or different, and are each independently hydrogen or a C1 to C3 alkyl group, A is a single bond or a C1 to C5 alkylene group, and n ranges from 2 to 3;GN[CH2PO3H2]2 Chemical Formula 2wherein in Chemical Formula 2, G is —CH2PO3H2, a group represented by Chemical Formula 3, or a group represented by Chemical Formula 4 as described herein.