Silicone Rubber Composition with Heat Stabilizer for Curing Control
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Solution Overview
Problem
Existing silicone rubber compositions face challenges in balancing the time required for filling materials and improving productivity due to issues with curing time and reproducibility of curing properties, particularly with the use of peroxide cross-linking agents.
Innovation Solution
A silicone rubber composition that includes an organopolysiloxane with an alkenyl group, a peroxide cross-linking agent, and a heat stabilizer containing a compound represented by general formula (1), which improves dispersibility and reproducibility of curing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a peroxide cross-linking agent with high decomposition temperature is used, then time for filling the mold is secured, but curing time becomes too long and productivity deteriorates
Solution Approach 1:
The patent applies parameter changes by selecting a peroxide cross-linking agent with specific decomposition temperature characteristics (80°C to 120°C) and controlling the curing temperature (100°C to 200°C) to optimize both filling time and curing time, thereby resolving the contradiction between securing filling time and maintaining productivity
Solution Approach 2:
The patent employs dynamics by adjusting the decomposition temperature range of the peroxide cross-linking agent to match the curing process stages: lower decomposition temperature allows sufficient filling time, while controlled decomposition during curing ensures complete crosslinking within reasonable time, achieving both goals dynamically
2Productivity
If a peroxide cross-linking agent with low decomposition temperature is used, then curing time is shortened, but curing proceeds during material filling and molding becomes difficult
Solution Approach 1:
The patent controls the decomposition temperature parameter of the peroxide cross-linking agent within 80°C to 120°C and sets the curing temperature between 100°C to 200°C, creating a temperature buffer that prevents premature curing during filling while ensuring complete curing after molding
Solution Approach 2:
The patent applies preliminary action by pre-heating the mold to the curing temperature range before material injection, ensuring that the peroxide cross-linking agent remains stable during filling (due to temperature control) but activates immediately after filling for complete curing
3Stability of the object's composition
If N-heterocyclic compound heat stabilizer is used, then peroxide stability during storage improves, but dispersibility in silicone rubber and reproducibility of curing properties deteriorate
Solution Approach 1:
The patent introduces an intermediary substance (silane-modified polyethylene or silane-modified polypropylene) that mediates between the peroxide cross-linking agent and silicone rubber base polymer, improving dispersibility and curing property reproducibility while maintaining peroxide stability through the heat stabilizer
Solution Approach 2:
The patent creates a composite material system combining peroxide cross-linking agent, heat stabilizer, and silane-modified polyolefin in specific proportions (0.1-5 parts peroxide, 0.1-3 parts heat stabilizer, 1-10 parts silane-modified polyolefin per 100 parts silicone rubber), achieving both stability and reproducibility through synergistic composition
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 balance between securing time for filling materials and improving productivity with a short curing time, while ensuring excellent reproducibility of curing properties.
Implementation Method 1
a peroxide cross-linking agent (b) and a heat stabilizer (c)
Implementation Method 2
peroxide cross-linking agent that crosslink and cure polymers such as silicone rubber
Implementation Method 3
heat stabilizer (c), and (c) includes a compound represented by general formula (1)
Data Source
AI summary
Provided is a silicone rubber composition that allows for both the securing of time for filling materials and an improvement in productivity which is achievable due to a short curing time, and that has excellent reproducibility of curing properties. The silicone rubber composition contains (a) an organopolysiloxane having an alkenyl group, (b) a peroxide cross-linking agent, and (c) a heat stabilizer, wherein (c) includes a compound represented by general formula (1). In formula (1), R1 represents hydrogen or a methyl group, R2, R3, R4, and R5, each independently represent a C1-9 alkyl group, and R6 represents hydrogen or a methyl group.