Application of hydrolysis stabilizer in PC

PC (polycarbonate) is a carbonic acid polyester with many types, mainly formed by polycondensation of bisphenol A and diphenyl carbonate or dimethyl carbonate.

PC is an almost colorless glassy amorphous polymer with good optical properties. It is widely used in the production of optically transparent parts such as photographic equipment, aircraft cockpit glass, high-speed aircraft windshields and sunroofs, car lights, etc.

As a transparent material, the surface of PC is not easy to scratch and has good comprehensive mechanical properties. Tensile, compression, and bending strength are equivalent to PA66, and the impact strength is very high, higher than PA and most engineering plastics.

PC has good heat resistance. The heat distortion temperature is greater than 126°C. PC has good cold resistance. It can work for a long time at minus 70°C. The body thermal conductivity and specific heat capacity are centered in the plastic. It is a good thermal insulation material.

PC is an insulating material with better electrical properties. It can maintain good electrical properties in a wide temperature range.

The chemical properties of PC are good, aliphatic hydrocarbons and oils. Most alcohols have no effect on it, and are resistant to dilute acids, salts, and oxidants, but are not resistant to alkalis.

PC has good flame retardant properties. It can burn slowly in the flame but can suffocate and self-extinguish away from the fire.

The main performance defect of PC is that the stability of hydrolysis resistance is not high enough, and it will hydrolyze and yellow when exposed to hot and humid environment for a long time. This is because the ester bond in the PC molecular chain is prone to hydrolysis reaction with carboxylic acid or water under damp and heat conditions, causing the molecular chain to break, which in turn causes the overall performance of the PC material to decrease and the service life to shorten.