Solventless Silicone Adhesive for Buffering and Heat Resistance
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Solution Overview
Problem
Conventional pressure sensitive silicone adhesives face challenges with flexibility, heat resistance, and buffering functions, particularly in high-temperature applications, and suffer from foaming issues due to solvent-based compositions, which limit their use in electronic and electric components where high adhesion and thermal stability are required.
Innovation Solution
A solventless addition-curable pressure sensitive silicone adhesive composition comprising specific polydiorganosiloxanes, polyorganohydrosiloxanes, and a platinum group metal catalyst, which provides high flexibility, adhesion, and heat resistance, suitable for use as a buffer member in electronic and electric components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solvent-based pressure sensitive silicone adhesive is used, then adhesion to substrates is improved, but foaming occurs during thermal curing which deteriorates the adhesive quality
Solution Approach 1:
The patent removes the solvent component from the adhesive composition entirely, using a solventless formulation based on polydiorganosiloxane, polyorganohydrosiloxane, and crosslinking agents. This extraction of the harmful solvent element eliminates foaming during thermal curing while maintaining the adhesive's bonding strength through optimized siloxane-based chemistry and crosslinking mechanisms.
2Temperature
If conventional pressure sensitive silicone adhesive is used for high temperature applications, then heat resistance is maintained, but flexibility and buffering function are insufficient
Solution Approach 1:
The patent creates a composite adhesive system combining polydiorganosiloxane (providing heat resistance), polyorganohydrosiloxane (providing flexibility), and crosslinking agents (enhancing structural integrity). This composite formulation achieves both high-temperature stability and flexible buffering characteristics, allowing the adhesive to maintain composition stability while accommodating thermal expansion and contraction of substrates.
3Strength
If pressure sensitive adhesive tape is used to fix buffer members, then adhesion is achieved, but additional preparation steps are required which complicates the process
Solution Approach 1:
The patent merges the adhesive function and buffer member functions into a single integrated product. The pressure sensitive adhesive composition is formulated to directly serve as both the bonding agent and the buffer layer, eliminating the need for separate adhesive tapes and buffer members. This consolidation reduces the number of components and assembly steps while maintaining both adhesion and shock-absorbing capabilities.
4Object-generated harmful factors
If solventless pressure sensitive silicone adhesive is used, then foaming is prevented, but achieving sufficient flexibility and adhesion becomes more difficult
Solution Approach 1:
The patent optimizes the molecular parameters of the siloxane components, including viscosity, molecular weight, and functional group content. By carefully controlling the ratio of polydiorganosiloxane to polyorganohydrosiloxane and adjusting the crosslinking agent content, the formulation achieves sufficient adhesion and flexibility without solvents. The parameter optimization ensures proper flow and bonding characteristics while maintaining a solventless composition that prevents foaming.
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 solventless composition exhibits improved flexibility, adhesion, and heat resistance, reducing the risk of foaming and enhancing the buffering function, making it suitable for high-temperature applications without the drawbacks of solvent-based adhesives.
Implementation Method 1
a solventless addition-curable pressure sensitive silicone adhesive composition comprising (A) a polydiorganosiloxane having at least two alkenyl group-containing organic groups per molecule... (C1) a polyorganohydrosiloxane having at least three SiH groups per molecule... (D) a platinum group metal catalyst
Data Source
AI summary
A solventless addition-curable pressure sensitive silicone adhesive composition is provided. The composition comprises (A) an alkenyl group-containing polydiorganosiloxane; (B) a condensation product of (a) a polydiorganosiloxane having hydroxyl group or an alkoxy group on opposite ends of the molecular chain and (b) a polyorganosiloxane containing R13SiO1/2 unit and SiO2 unit as critical components and also a HOSiO3/2 unit in the molecule; (C1) a polyorganohydrosiloxane having at least three SiH groups per molecule; (C2) a polydiorganohydrosiloxane having SiH group on opposite ends; and (D) a platinum group metal catalyst. Use of the present composition enables production of a pressure sensitive adhesive agent having flexibility, pressure sensitive adhesiveness, and heat resistance, and the present composition is particularly effective for use as a buffer member having pressure sensitive adhesiveness.