Polysiloxane Composite Barrier for Moisture Protection
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Solution Overview
Problem
Existing materials fail to effectively prevent moisture ingress into sensitive devices, leading to degradation of device characteristics, and existing desiccant materials are limited by unpredictable viscosity changes and lack of functionality as both barriers and getters.
Innovation Solution
A composite material with a polysiloxane matrix containing a combination of irreversible and reversible H2O sorbers, specifically alkaline earth metal oxides and aluminosilicates like zeolites, is used to create a barrier that prevents moisture ingress, with the sorbers' weight ratio and granulometry optimized to maintain rheological stability and enhance moisture removal capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic powders are added to polymeric resin to create barrier material, then moisture absorption capacity is improved, but viscosity becomes unpredictable and changes
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle size of inorganic powders (specifically using nanometric particles with Dv0.5 between 50-500 nm) and optimizing their concentration range (1-20 wt%) within the polysiloxane matrix. This parameter optimization ensures that the viscosity of the composite material remains predictable and suitable for deposition processes while maintaining effective moisture absorption capacity.
Solution Approach 2:
The patent creates a composite barrier material consisting of a polysiloxane matrix combined with specific inorganic sorbing particles. This composite structure integrates the benefits of both organic polymer (flexibility, adhesion) and inorganic particles (moisture absorption), achieving a material that maintains stable rheological properties while providing reliable moisture protection for sensitive devices.
2Reliability
If desiccant material is used to absorb moisture after permeation, then moisture removal is achieved, but the material cannot prevent moisture ingress as a barrier
Solution Approach 1:
The patent implements multi-functionality by designing a single composite material that simultaneously performs both barrier and getter functions. The polysiloxane matrix with dispersed inorganic sorbing particles creates a material that prevents moisture ingress through the barrier effect while the inorganic particles actively absorb any moisture that penetrates, eliminating the need for separate desiccant elements and providing versatile protection.
Solution Approach 2:
The patent merges the barrier function (provided by the polysiloxane matrix structure) and the getter function (provided by inorganic sorbing particles) into a single integrated composite material. This combination allows the material to operate as both a physical barrier and an active moisture absorber, solving the limitation of traditional desiccant materials that could only absorb moisture after permeation.
3Strength
If high cross-linking degree is used in polysiloxane matrix, then structural integrity and rigidity are improved, but the material becomes less adaptable to mechanical stresses
Solution Approach 1:
The patent applies local quality by creating regions of different cross-linking densities within the polysiloxane matrix. The matrix contains both highly cross-linked regions ( providing rigidity and structural integrity) and less cross-linked regions (providing flexibility and adaptability to mechanical stresses). This spatial variation in cross-linking density allows the material to simultaneously achieve strength and flexibility, accommodating different device requirements.
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 composite material effectively prolongs the breakthrough time of moisture into sensitive devices, maintaining rheological stability and improving device lifetime without altering the material's properties during production or use.
Implementation Method 1
H 2 O sorbers are dispersed within the polysiloxane matrix according to the present invention. The H 2 O sorbers dispersed within the polysiloxane matrix according to the present invention are constituted by at least two different types of sorbers: an irreversible sorber preferably chosen from the alkaline-earth metal oxides, and a reversible sorber chosen from aluminosilicates
Implementation Method 2
a polysiloxane matrix as a barrier to the ingress of H 2 O within sensitive devices
Data Source
Figure 1
AI summary
Improved polysiloxane composite barrier to control, preventing the ingress, limiting the level of H2O within devices sensitive to its presence, method for its production and sensitive devices employing such barriers for the control of the H2O level at their inside.