2. Semi-inorganic polymer composites
Silicone rubber as a semi-inorganic polymer composite material, when adding different fillers will have different effects on the heat resistance of silicone rubber. For example, some amphoteric metal compounds filler can absorb the silicone rubber in the acidic or alkaline substances, which can effectively reduce the catalytic degradation of these substances on the silicone rubber, this measure can effectively reduce the possibility of heat aging of silicone rubber, the commonly used materials are generally alumina. In general, the filler is not only a good filler, properly used to better improve the heat resistance of silicone rubber.
3. Environmental factors
The use of water in the environment, including water vapor can be triggered in the silicone rubber silicone oxygen bond breakage, and finally generated silicone hydroxyl, and it is well known that the existence of silicone hydroxyl for the heat resistance of silicone rubber is an adverse effect. In addition, it is interesting to note that, when filling silicone rubber, the hydrolysis and rearrangement of siloxanes have the same effect on the mechanical properties, so it is difficult to determine whether there is hydrolysis through the analysis of the mechanical properties, but the difference in heat resistance can be used as a basis for its determination. Silicone rubber system in the presence of acid, alkali will play a catalytic degradation of silicone rubber in addition to the environment of oxygen, ozone on the thermal degradation of silicone rubber also has a certain adverse effect. At the same time, the application of the environment, such as the presence of load cyclic stress will accelerate the degradation of dimethylsiloxane and diphenylsiloxane copolymer elastomers, resulting in a reduction in the heat resistance of the material, and the two components of the copolymer composition is different, the degradation mechanism is also different.
Room termperature curing polysilazane, pls check
IOTA 9150,
IOTA 9150A.
High termperature curing polysilazane, pls check
IOTA 9108,
IOTA 9118.
