PVDF solar cell backplane film production line
DATE：2021/5/24 8:30:31 / READ： / SOURCE：This station
PVDF solar cell backplane film production line
Development of modified polycarbonateThe molecular chain of polycarbonate contains a variety of chemical groups. The benzene ring on the main chain provides rigidity and chemical stability. Isopropyl and ether bond provide softness and toughness. Kuji is easy to absorb water and is more sensitive to water. As an insulating material. The electrical properties of PC are not affected by temperature. It has high heat resistance and is an excellent high value insulating material. The melt viscosity of PC is very high, so it is difficult to process into large thin-walled products. The viscosity of PC behaves as near collar fluid even at high shear rate, and the shear rate has little effect on the coarseness of PC. But it is more sensitive to temperature, so increasing temperature can improve the processing fluidity of PC more effectively than increasing shear rate. PC is easy to hydrolyze in the high temperature molding process, even a small amount of water will cause the decomposition of PC. therefore, before processing, we must fully dry the medium to make the water content below 0.03%, preferably 0.01%. Because polycarbonate is easy to hydrolyze, it is not suitable for use in high temperature and high humidity environment.
It has good modularity. It can be used at - 50 ℃ for a long time, but has poor solvent resistance; PC has excellent notchless impact toughness, but it has high notch sensitivity: the surface hardness of PC is low, and it is easy to scratch; the transparency of PC is very high, and the light transmittance can reach 90%. It is widely used in transparent products: the processability of PC is poor, and it is easy to residual internal stress in products, and it is easy to cause environmental stress cracking and organic solvent cracking, which is the biggest bottleneck of its application.
The purpose of modifying PC is to improve the shortcomings of PC and give PC higher and new properties. The main aspects are as follows: 1. Improve processing fluidity and forming processability; 2. Improve fatigue resistance and hardness; 3. Improve thick wall stress cracking and low temperature impact toughness and reduce notch sensitivity; 1. Improve solvent resistance; 9. Improve wear resistance; 6 give new characteristics, such as flame retardant, electroplating, antistatic: 7 reduce costs.
The varieties and properties of PC alloy are as follows: 1pc / ABS alloy; It is the main variety of PC alloy with good processing fluidity, low notch sensitivity of impact strength and good low temperature toughness. 2pc / PS alloy: good processing fluidity, good optical properties, low cost, 2pc / PE, PC / PP Alloy; Good processing fluidity, high elastic modulus and good stress cracking resistance. APC / POM alloy: PC and POM can be mixed in any proportion, which has excellent mechanical properties, heat resistance, solvent resistance and stress cracking resistance of PC. OPC / PBT, PC / Pet alloy: improve the solvent resistance, wear resistance, stress cracking resistance and processing fluidity of PC, 8pc / PA alloy; 1pc / SMA alloy: high hot deformation temperature, can be used for microwave cookers; Low birefringence, can be used to make optical disk. 8pc / PMMA alloy; It has good heat resistance, UV light resistance, high notch impact strength, high welding strength and pearlescent color of its injection products. It can be used in the production of various alloy materials such as ornaments: the development of CD, VCD and DVD in the four luminescent bodies, and the roof of the center of the daily expenses office. At present, it has been involved in the decoration of some families, and the window glazing has not been widely used in China. In the application field of certificate I, the market competitors of PC are acrylic acid and ester resin. The latter has the advantages of weather resistance and reasonable price, but its comprehensive performance is not as good as PC, so the application of PC in this field will grow rapidly. Better than pc.o soundproof board / PEI: new growth point of PC for expressway, high-speed railway and urban expressway. Due to the rapid development of expressway, high-speed railway and urban expressway construction in the world (including China), the demand for road components is also growing rapidly. PMMA and pc.pmma are mainly used in this field
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