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May 28, 2024
When subjected to thermal oxidation, a stable protective layer rich in Si-0-Si chains is formed on the surface of organic silicon polymers, reducing the impact on the internal structure of the polymers. Therefore, silicone resin has a high thermal decomposition temperature, can be used for a long time at 200-250 ℃ without decomposition or discoloration, and the Si-0 Si chain only begins to break at 350 ℃; Stable at room temperature, after crosslinking and curing, it can withstand high temperatures of 350-500 ° C for a short period of time. However, most organic polymers have already been completely cracked, losing their usability. Therefore, organosilicon polymers have special thermal stability.
Most polysiloxanes have both methyl and phenyl substituents, and the ratio of the two has a significant impact on their performance. For example, organic silicone resins with high methyl content have fast crosslinking speed, poor storage stability, good light aging resistance, and low temperature flexibility; The organic silicone resin with high phenyl content has good high-temperature stability and storage stability, but the curing rate is slow, resulting in more weight loss and poor photostability during high-temperature curing. If a longer alkyl benzene is used to replace the organic group directly connected to silicon in organic silicon, as the chain length of the substituent on the silicon atom increases, the toughness of the resin increases, but the thermal stability and hardness decrease.
It is generally believed that the thermal stability of organosilicon polymers varies with the type of organic groups connected to silicon atoms. The thermal stability of organosilicon polymers containing aliphatic organic groups decreases with an increase in the number of organic carbon atoms, while those containing aromatic groups have better heat resistance than those containing aliphatic groups. Due to their cyclic structure, aromatic groups can exhibit higher thermal stability. But different types of organic substituents also have different heat resistance temperatures, and the heat resistance temperatures of various organic silicons are roughly:; Phenyl silicone exceeds 200℃, methyl silicone reaches 200℃, ethyl silicone reaches 140℃, and propyl silicone reaches 120℃.
SILIBASE is the combination of "SILICONE" and "BASED", which means that SILIBASE SILICONE is focused on producing and selling all kinds of SILICONE-BASED new materials.Our main products are Acrylic Modified Silicone Resin Emulsion,Epoxy Modified Silicone Resin Emulsion,Smokeless Silicone Resin,Self-drying Silicone Resin,Highly Active Silicone Resin,Methyl Silicone Resin Intermediate.