Thermally Conductive Silicone Composition With Stable Viscosity
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Solution Overview
Problem
Existing thermal conductive silicone compositions face challenges such as poor storage stability, phase separation, and limited thermal stability, especially under extreme thermal cycling, and there is a need for thermally stable materials with improved thermal conductivity.
Innovation Solution
A functionalized siloxane polymer composition is developed, incorporating arylene ether groups in the silicone polymer matrix to enhance thermal conductivity and phase change characteristics, allowing for reversible thermoplastic elastomeric properties over a wide temperature range, achieved by controlling molecular weight and filler ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional silicone polymers are used to ensure flexibility and processability, then the polymer can be easily processed and applied, but the polymer shows significant viscosity changes and becomes unusable within 1-2 years due to crosslinking reactions
Solution Approach 1:
The patent extracts the crosslinking functionality from the main polymer chain by using a separate crosslinking agent (silane-modified polyol) that only becomes active under specific conditions (moisture, catalyst presence). This separation prevents premature crosslinking during storage while enabling controlled crosslinking during application, thereby extending shelf life and maintaining viscosity stability.
Solution Approach 2:
The patent applies preliminary action by pre-modifying the polyol with silane groups before formulation, but keeping the crosslinking mechanism dormant during storage. The crosslinking reaction is prepared in advance through chemical modification of the polyol structure, yet remains inactive until triggered by moisture or catalyst during the application phase, thus preserving stability during storage.
2Productivity
If crosslinking reactions are accelerated to reduce processing time, then application efficiency improves, but the polymer loses flexibility and becomes difficult to process
Solution Approach 1:
The patent implements dynamics by creating a crosslinking system that transitions from a dormant state during storage to an active state during application. The crosslinking reaction kinetics are dynamically controlled through moisture content and catalyst concentration, allowing the system to adapt its processing characteristics: flexible and processable during storage, then rapidly crosslinking during application to achieve high productivity.
Solution Approach 2:
The patent applies parameter changes by controlling the crosslinking reaction through varying moisture content, catalyst concentration, and temperature during different stages. During storage, low moisture and absence of catalyst maintain slow reaction kinetics for flexibility. During application, increased moisture and catalyst activation accelerate the crosslinking rate to improve productivity and reduce processing time.
3Strength
If crosslinking density is increased to improve mechanical strength, then the polymer becomes more rigid and less flexible
Solution Approach 1:
The patent applies local quality by creating regions of different crosslinking density within the polymer network. The silane-modified polyol forms crosslinked regions that provide mechanical strength, while the main polyol chains maintain flexibility in non-crosslinked areas. This spatial differentiation of crosslinking density allows simultaneous achievement of high strength and flexibility.
Solution Approach 2:
The patent uses composite materials by combining silane-modified polyol (which forms crosslinked gel structures) with unmodified polyol (which maintains flexibility). This composite polymer system integrates the strength-providing crosslinked network with the flexibility-providing linear chains, achieving both mechanical strength and compositional stability.
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 exhibits improved thermal conductivity with lower filler loading, maintaining stability and phase change characteristics, suitable for various applications including electronic devices and personal care products.
Implementation Method 1
it has become necessary to use a catalyst to promote the crosslinking reaction
Implementation Method 2
crosslinking reaction between silane-modified polyol and moisture to form a gel structure
Data Source
AI summary
Provided is a composition comprising: (A) a silicone polymer of the Formula (I): M1 a M2 b M3 cD1 d D2 e D3 f T1 g T2 h T3 i Qj. wherein: M1 = R1R2R3SiO1/2 M2 = R4R5R6SiO1/2 M3 = R7R8R9SiO1/2 D1 = R10R11SiO2/2 D2 = R12R13SiO2/2 D3 = R14R15SiO2/2 T1 = R16SiO3/2 T2 = R17SiO3/2 T3 = R18SiO3/2 Q = SiO4/2 where R1, R2, R3, R5, R6, R8, R9, R10, R11, R13, R15, R16 are independently chosen from a hydrogen, a C1-C60 aliphatic or aromatic group or C1-C60 alkoxy group; R4, R12, R17 are independently chosen from a C1-C10 alkyl, a C1-C10 alkoxy, or R19-A-R20- where A is chosen from a group comprising an unsaturated cyclic moiety chosen from an aromatic group, a fused aromatic group, an unsaturated alicyclic group, an unsaturated heterocyclic group, or a combination of two or more thereof; R19 is chosen from a -H, a C1-C10 alkyl, allyl, vinyl, alkoxy, allyloxy, vinyloxy, acrylate, or methacrylate; and R20 is chosen from a divalent organic group; R7, R14, R18 are independently selected from hydrogen or OR22 or unsaturated monovalent radicals or radicals containing heteroatom such as oxygen, nitrogen, sulfur or radicals containing organosilane groups; and the subscripts a, b, c, d, e, f, g, h, i, j are zero or positive subject to the following limitations: 2≤a+b+c+d+e+f+g+h+i+j≤1000, b+e+h >0 and c+f+i≥0 and B) a thermally conductive filler.