Polycarbonate (PC), also known as PC plastic; It is a polymer containing carbonate groups in its molecular chain, which can be classified into various types based on the structure of the ester groups, including aliphatic, aromatic, and aliphatic aromatic groups. Due to the low mechanical properties of aliphatic and aliphatic aromatic polycarbonates, their application in engineering plastics is limited.
Only aromatic polycarbonate has achieved industrial production. Due to the unique structure of polycarbonate, it has become the fastest growing general-purpose engineering plastic among the five major engineering plastics.
With the development of the times and industrial requirements, the requirements for PC materials are becoming higher and higher. Ordinary PC materials cannot meet the requirements of enterprises for producing specific products, so the modification of PC materials is necessary. Currently, there are five mainstream directions for PC modification. Today, Tesheng Plastic takes everyone to understand!
Five major modification directions for PC materials
Toughened PC
The material has good impact resistance, adjustable impact performance, low molding shrinkage, stable size, good weather resistance, high low-temperature impact, and can be sprayed. Mainly used in thin-walled products, automotive accessories, mobile phones and other electronic and electrical products.
Flame retardant PC
The flame retardant performance of the material complies with industry regulations such as UL94 V0/1.5mm, and can pass UL certification in the United States. The falling ball impact can withstand 1.3m/500g steel ball free fall impact, and welding can pass free fall testing. The environmental performance can meet industry regulations such as ROHS and REACH, and the thermal deformation temperature (1.82MPa/3.20mm) can reach 127 ℃. Mainly used in high-end chargers, lamp holders, switch panels, OA devices and other electronic and electrical products.
Enhanced modified PC
Adding reinforcing materials to plastic to improve its properties, especially its mechanical properties, can be greatly improved. Enhanced modification not only brings about a leap in mechanical properties, but also endows materials with excellent properties, with the following characteristics:
High specific strength: The so-called high specific strength refers to the ratio of material strength to relative density. By enhancing the specific strength of some plastics, it is equivalent to that of metals.
Good shock absorption and overload safety.
Good fatigue resistance: it has good resistance to repeated stress.
Good heat resistance: By strengthening, the thermal deformation temperature can be significantly increased.
Low linear expansion coefficient: Due to the addition of fiber materials, the linear expansion coefficient of reinforced materials is much lower than that of plastic bodies, resulting in a small shrinkage rate during product molding. It can be used to manufacture products with high dimensional precision requirements.
Filling modified PC
It refers to adding solid fillers to the plastic matrix to reduce costs or alter certain properties of the plastic.
Enhancement: The price of most fillers is much lower than that of plastic, so adding plastic can reduce costs.
Improving certain properties: Some properties of plastics may not be satisfactory, but the addition of fillers can improve some of their properties. Such as the bending strength and heat resistance of the material.
Function endowing: Using metal powder or carbon black as filler can endow the material with conductivity.
alloy
A system obtained by blending two or more different plastics is called a plastic alloy. The main purpose of preparing alloys is to achieve good complementarity between the components of different plastics. Of course, some of the performance also exceeds that of any individual component.