Thermosetting Silicone Rubber Composition with Ionic Liquid Antistatic Agent
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Solution Overview
Problem
Existing heat curable silicone rubber compositions fail to simultaneously achieve high transparency and antistatic properties, which are essential for optical applications such as LED sealing and protection, where both properties are required at a high level.
Innovation Solution
A heat curable silicone rubber composition comprising organopolysiloxane, silicone resin, organohydrogenpolysiloxane, a hydrosilylation reaction catalyst, and an ionic liquid as an antistatic agent, where the ionic liquid's refractive index difference from the cured product is within ±0.04, ensuring both transparency and antistatic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ionic liquid is blended as an antistatic agent in heat curable silicone rubber, then antistatic property is improved, but transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive index of the ionic liquid to be within ±0.04 of the cured silicone rubber product. This parameter optimization allows the ionic liquid to provide antistatic functionality while remaining optically invisible, thus resolving the contradiction between antistatic property and transparency
Solution Approach 2:
The patent utilizes the homogeneous dispersion of ionic liquid molecules within the silicone rubber matrix, creating a uniform composite structure at the molecular level. This homogeneous distribution prevents light scattering while maintaining the antistatic effect, effectively balancing both requirements
2Adaptability or versatility
If both transparency and antistatic property are required at high levels for optical applications, then application suitability is improved, but formulation complexity increases
Solution Approach 1:
The patent achieves multi-functionality by selecting ionic liquids that simultaneously provide antistatic properties and optical compatibility. The same ionic liquid component serves dual purposes: electrical charge dissipation and optical transparency, eliminating the need for separate additives for each function and simplifying the overall formulation
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 composition achieves a cured product with high transparency and excellent antistatic properties, suitable for various optical applications, including LED lenses, with total light transmittance exceeding 85% at 600 nm and 93% at 2 mm thickness.
Implementation Method 1
an ionic liquid serving as an antistatic agent
Implementation Method 2
a hydrosilylation reaction catalyst
Implementation Method 3
a difference of a refractive index from a refractive index of a cured product formed of a base silicone rubber mixture of the components (A), (B), (C) and (D) is within the range of ± 0.04
Data Source
AI summary
The present invention provides a thermosetting silicone rubber composition which is capable of providing a cured product that has good transparency and good antistatic properties. A thermosetting silicone rubber composition which contains (A) 100 parts by mass of an organopolysiloxane, (B) 10-400 parts by mass of a silicone resin, (C) an organohydrogen polysiloxane in such an amount that the number of hydrogen atoms bonded to silicon atoms is 1.0-10.0 per one alkenyl group bonded to a silicon atom in the components (A) and (B), (D) a silicone rubber base polymer that contains a hydrosilylation catalyst, and (E) 30-3,000 ppm of an ionic liquid that serves as an antistatic agent. The ionic liquid contained as the component (E) has a refractive index that is within ±0.04 from the refractive index of the cured product of the silicone rubber base polymer.