1. The effect of toughening agents on the transparency of silicone rubber
Due to the absence of filler components in MQ raw rubber, its appearance is glassy and transparent. According to the experimental results, a toughening agent of 0.3 phr has almost no effect on the transparency of silica gel, and the sample still maintains a high degree of transparency. When the addition amount increases to 1 part, the transparency decreases.
2. The effect of toughening agents on the Mooney viscosity of MQ raw rubber
Through the change in the Mooney viscosity of the rubber material, it can be seen that the addition of toughening agents increases the viscosity of the rubber material, increases the intermolecular forces, and improves the processability of the silicone gel.
3. Evaluation of toughening agents on the processability of MQ raw rubber
MQ raw rubber without toughening agent is difficult to mix on the open mill, and the rubber material is prone to breakage and difficult to roll off; After adding 0.3phr toughening agent, the strength of MQ raw rubber increased, and the rubber material wrapping roller was normal and could be operated thinly; After adding 1.0 phr toughening agent, the raw rubber strength of the rubber material is significantly improved, even better than the processing performance of high hardness silicone rubber. It can not only perform normal rubber compounding, but also achieve a large amount of filling.
4. Suggestions for the use of toughening agents in low hardness silicone gel
(1) Due to the small intermolecular shear and temperature rise during the mixing of low hardness silicone, it is recommended to control the mixing temperature between 40 ° C and 50 ° C to increase the dispersion of toughening agents in the silicone, enhance the toughening effect, and also shorten the mixing time.
(2) A toughening agent of 0.3 phr can significantly improve the processability of low hardness silicone, making the rubber easy to roll and mix.
(3) For applications with high transparency requirements, it is recommended to control the amount of toughening agent added, with 0.3 phr being the optimal.
(4) For products that require the addition of a large amount of functional fillers, such as high conductivity, high thermal conductivity, etc., it is advisable to increase the amount of toughening agent added to facilitate higher filling.
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