How Much Do You Know About The Raw Material Of Water Bottle--PC ?

How Much Do You Know About The Raw Material Of Water Bottle--PC ?

PC Material, not BPA FREE , do you know this ?

Introduction of PC material ：

Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures.  Polycarbonates used in engineering are strong,  tough materials,  and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications.  Polycarbonates do not have a unique resin identification code (RIC) and are identified as "Other",  7 on the RIC list. Products made from polycarbonate can contain the precursor monomer bisphenol A (BPA).

Abbreviation for polycabonate

Feature: Colorless and transparent, high hardness, strong impact resistance, nonrenewable.

                 High heat resistance its thermal deformation temperature is135℃, but it will precipitate out BPA in high tempreture, and it's bad for health.

Application: Widely used in develop industry, architectural material industry, motor-car industry, medical equipment and so on.

Production

The main polycarbonate material is produced by the reaction of bisphenol A (BPA) and phosgene COCl
2. The overall reaction can be written as follows:

The first step of the synthesis involves treatment of bisphenol A with sodium hydroxide, which deprotonates the hydroxyl groups of the bisphenol A.

• (HOC₆H₄)₂CMe₂ + 2 NaOH → Na₂(OC₆H₄)₂CMe₂ + 2 H₂O

The diphenoxide (Na₂(OC₆H₄)₂CMe₂) reacts with phosgene to give a chloroformate, which subsequently is attacked by another phenoxide. The net reaction from the diphenoxide is:

• Na₂(OC₆H₄)₂CMe₂ + COCl₂ → 1/n [OC(OC₆H₄)₂CMe₂]_n + 2 NaCl

In this way, approximately one billion kilograms (one million tonnes) of polycarbonate is produced annually. Many other diols have been tested in place of bisphenol A (e.g., 1,1-bis(4-hydroxyphenyl)cyclohexane and dihydroxybenzophenone). The cyclohexane is used as a comonomer to suppress crystallisation tendency of the BPA-derived product. Tetrabromobisphenol A is used to enhance fire resistance. Tetramethylcyclobutanediol has been developed as a replacement for BPA.

An alternative route to polycarbonates entails transesterification from BPA and diphenyl carbonate:

• (HOC₆H₄)₂CMe₂ + (C₆H₅O)₂CO → 1/n [OC(OC₆H₄)₂CMe₂]_n + 2 C₆H₅OH

The diphenyl carbonate was derived in part from carbon monoxide, this route being greener than the phosgene method.

The ring-opening polymerization of cyclic carbonates has been investigated.

How Much Do You Know About The Raw Material Of Water Bottle--PP ?