Millable Silicone Rubber Composition with High Plasticity at Low-Hardness
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Solution Overview
Problem
Existing millable silicone rubber compounds face issues with decreased plasticity due to excessive use of surface treatment agents, leading to defects like deformation and stickiness, while insufficient use causes reverse plasticization, and existing solutions are either expensive or economically inefficient.
Innovation Solution
A millable silicone rubber compound comprising organopolysiloxane raw rubber, reinforcing silica with specific surface area, partial hydrolysate of organoalkoxysilane, and condensation reaction catalysts, which enhance plasticity without increasing hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the amount of surface treatment agent is increased to improve dispersion of reinforcing filler, then dispersion is improved, but plasticity of the silicone rubber compound decreases
Solution Approach 1:
The invention changes the chemical structure parameters of the surface treatment agent by specifying particular organosilane compounds with controlled molecular weights and functional groups. This optimization allows effective dispersion at lower addition amounts, thereby maintaining plasticity while achieving good filler distribution.
Solution Approach 2:
The invention creates a composite system combining organopolysiloxane raw rubber, reinforcing filler, and specifically selected organosilane surface treatment agents. This composite approach synergistically improves dispersion quality while preserving the plasticity needed for processing.
2Ease of operation
If the amount of surface treatment agent is decreased to maintain plasticity, then plasticity is maintained, but reverse plasticization occurs
Solution Approach 1:
The invention optimizes the molecular weight parameters and functional group composition of the organosilane surface treatment agent to achieve maximum dispersion efficiency at minimal addition amounts. This prevents reverse plasticization while maintaining adequate plasticity for processing.
Solution Approach 2:
The organosilane surface treatment agent acts as an intermediary that bridges the reinforcing filler and organopolysiloxane matrix. By selecting specific organosilane compounds with appropriate structures, the invention achieves effective mediation at low concentrations, avoiding both excessive dispersion effects and reverse plasticization.
3Ease of operation
If expensive additives are used to increase plasticity, then plasticity is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive plasticity-enhancing additives with a cost-effective organosilane surface treatment agent system. The optimized surface treatment approach achieves the desired plasticity at lower material cost, making the manufacturing process more economical.
Solution Approach 2:
The invention changes the approach to plasticity enhancement by optimizing the parameters of the surface treatment agent rather than adding expensive separate plasticity modifiers. This parameter optimization of the existing surface treatment system achieves cost-effective plasticity improvement.
4Stability of the object's composition
If heating treatment is applied to reduce reverse plasticization, then reverse plasticization is reduced, but production time and energy consumption increase
Solution Approach 1:
The invention performs preliminary action by selecting surface treatment agents with optimized molecular structures that prevent reverse plasticization from occurring in the first place. This preventive approach eliminates the need for subsequent heating treatment, reducing production time and energy consumption.
Solution Approach 2:
The invention changes the chemical parameters of the surface treatment agent to inherently prevent reverse plasticization, replacing the need for thermal treatment. This parameter optimization allows the system to achieve stability without additional heating steps.
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 compound achieves high plasticity and processability, reducing defects and costs associated with traditional methods.
Implementation Method 1
adding a condensation reaction catalyst of an organic metal compound selected from an organic titanium compound, an organic zirconium compound, and an organic aluminum compound, and performing heat treatment for condensation of silanol
Implementation Method 2
performing heat treatment for condensation of silanol
Implementation Method 3
performing heat treatment for condensation of silanol
Data Source
AI summary
The present invention provides: a millable silicone rubber compound including: (A) organopolysiloxane raw rubber; (B) reinforcing silica having a specific surface area of 50 to 450 m2/g; (C) a partial hydrolysate of organoalkoxysilane represented by the following general formula (1); and (D) one or more kinds of condensation reaction catalysts selected from the following (D1) to (D3): (D1) an amine compound having a boiling point of 30 to 60°C at 1013 hPa, the amine compound being in a liquid state at 25°C, (D2) hexaorganodisilazane represented by the following general formula (2), and (D3) ammonia water at 1.0 to 30.0 mass%. Thus, the present invention provides: a millable silicone rubber compound that enable to achieve high plasticity regardless of relatively low hardness of the millable silicone rubber compound, a millable silicone rubber composition, and a method for producing a millable silicone rubber composition. RSi(OR1)3 (1) R23SiNHSiR23 (2)