Vehicle Lamp Silicone Resin Composition for Anti-Fog Film Protection
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Solution Overview
Problem
The anti-fogging performance of vehicle lamps with silicone resin parts deteriorates due to the release of low molecular weight siloxanes, which are not adequately controlled in existing technologies.
Innovation Solution
A vehicle lamp configuration with a silicone resin part that reduces the total content of D3 to D20 cyclic low molecular weight siloxanes to 300 ppm or less, specifically focusing on reducing D11 to D20 siloxanes, to minimize the impact on the anti-fogging film, combined with an anti-fogging film containing surfactants on the inner surface of the front cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silicone resin part with reduced D3 to D10 content is used, then low molecular weight siloxane control is improved, but D11 to D20 siloxane release is not addressed causing anti-fogging performance deterioration
Solution Approach 1:
The patent extends the siloxane content control range from D3-D10 (conventional) to D3-D20 (invention), changing the specification parameters to include higher molecular weight siloxanes that were previously overlooked. This parameter expansion ensures comprehensive control of all low molecular weight siloxanes that could affect anti-fogging performance.
Solution Approach 2:
The patent segments the siloxane control into two distinct ranges: D3-D10 (anionic/cationic surfactant control) and D11-D20 (nonionic surfactant control). This segmentation allows targeted control strategies for different siloxane molecular weights, addressing the specific issue that D11-D20 siloxanes were not adequately controlled in conventional approaches.
2Temperature
If silicone resin part is used in vehicle lamp, then heat resistance and complicated shape are improved, but low molecular weight siloxane release causes anti-fogging film deterioration
Solution Approach 1:
The patent converts the harmful effect of low molecular weight siloxane release into a controlled parameter. By establishing specific content limits for D3-D20 siloxanes and implementing controlled release mechanisms, the invention transforms the previously harmful siloxane byproducts into a managed aspect of the silicone resin system that no longer deteriorates anti-fogging performance.
3Reliability
If anti-fogging film is provided on front cover, then fog prevention is improved, but water dripping marks occur due to siloxane accumulation
Solution Approach 1:
The patent applies preliminary anti-action by controlling the siloxane content in the silicone resin part before it can release and accumulate on the anti-fogging film. By pre-establishing content limits for D3-D20 siloxanes and implementing release control measures, the invention prevents the accumulation that would otherwise lead to water dripping marks and anti-fogging performance deterioration.
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
This configuration effectively prevents deterioration in anti-fogging performance by reducing the amount of low molecular weight siloxanes released, ensuring the anti-fogging film maintains its effectiveness even under high temperatures, thereby enhancing the lamp's performance.
Implementation Method 1
The silicone resin is known to release a cyclic low molecular weight siloxane (hereinafter simply referred to as a low molecular weight siloxane) as outgas
Implementation Method 2
an anti-fogging film mainly composed of a synthetic resin; the anti-fogging film contains an anti-fogging coating material containing any of anionic, cationic and nonionic surfactants
Data Source
AI summary
A vehicle lamp includes: a lamp body that has an opening in a direction of light radiation; a front cover that covers the opening to define a housing and includes, on an inner surface, an anti-fogging film mainly composed of a synthetic resin; a light source that is disposed in the housing; and a silicone resin part that is disposed in the housing. A content of D3 to D20 cyclic low molecular weight siloxanes in the silicone resin part is 0 ppm to 300 ppm in terms of mass.