Performance characteristics of polycarbonate hollow grid plate production line
DATE：2021/7/12 8:53:29 / READ： / SOURCE：This station
Performance characteristics of polycarbonate hollow grid plate production line
There are many chemical groups in the molecular chain. The benzene ring on the main chain provides rigidity and chemical stability. Isopropyl group and bond give softness and toughness. Ester group is easy to absorb water and is more sensitive to water. As an insulating material, the electrical performance of PC is almost not affected by temperature, and it has high heat resistance, so it is an excellent high frequency 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 Newtonian fluid even at high shear rate. The shear rate has little effect on the viscosity of PC melt, but it is more sensitive to temperature. Therefore, the processing fluidity of PC can be improved more effectively by increasing the temperature than by increasing the shear rate. PC is easy to hydrolyze in the process of high temperature molding, even a small amount of water will cause the decomposition of PC. therefore, it must be fully dried before processing, so that the water content is below 0.03%, the best is 0.01%. Because polycarbonate is easy to hydrolyze, it is not suitable for use in high temperature and humidity environment. Hollow grid production line www.handern.comPC has good weatherability, flame retardancy, self extinguishing and low temperature resistance. It can be used at - 60 ℃ for a long time, but has poor solvent resistance; PC has excellent notchless impact toughness, but it is more sensitive to notches; The surface hardness of PC is low and easy to scratch. The transparency of PC is very high, and the transmittance can reach 90%. It is widely used in transparent products; Poor processability of PC makes it easy to residual internal stress in products, which leads to 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 performance, mainly in the following aspects: 1; 2. Improve fatigue resistance and hardness; 3. Improve thick wall stress cracking and low temperature impact toughness, reduce notch sensitivity; 4. Improve solvent resistance; 5. Improve wear resistance; 6. Give new characteristics, such as flame retardant, electroplating and antistatic; 7. Reduce costs. Hollow grid production line www.handern.com
The varieties and properties of PC alloy are as follows: 1pc / ABS alloy 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. 3pc / PE, PC / PP Alloy: good processing fluidity, high modulus of elasticity, good stress cracking resistance. 4pc / POM alloy: PC and POM can be mixed in any proportion, with excellent mechanical properties and heat resistance of PC, and significantly improved solvent resistance and stress cracking resistance. 5pc / PBT, PC / Pet alloys: improve the solvent resistance, wear resistance, stress cracking resistance and processing fluidity of PC. 6pc / PA alloy: good impact toughness, chemical corrosion resistance. 7pc / SMA alloy: high hot deformation temperature, can be used for microwave cookers; It has low birefringence and can be used to make optical discs. 8pc PMMA alloy: good heat resistance, UV light resistance, high notch impact strength, high weld strength of its injection products, pearlescent color, can be used in the production of decorations. 9pc / PTFE alloy: it has high heat resistance, dimensional stability and washout toughness, and the biggest feature is high wear resistance. PTFE can play an internal lubricating role in PC, and adding a small amount of PTFE can increase the wear resistance of PC by 5 times. Hollow grid production line www.handern.com
According to the market development and domestic application status of PC in the world, the following areas are highly concerned at present: 1. Automotive applications: in addition to automotive lighting system, PC alloys are mainly used in the front and rear baffles, reflector frames, impeller covers, door handles, etc. of automotive dashboard system, interior and exterior decoration system, such as PC / ABS, PC / PBT, PC / PET, among which the most widely used PC / ABS alloy has the largest amount. As the automotive application is a big market of plastics industry, the competition among all kinds of plastics materials is also the most fierce in this market. At present, the main plastic resins competing with PC are polyester, polypropylene and other alloy materials. The development of CD, VCD and DVD in optical media is the focus of PC development in the world. 3. Lighting field: mainly outdoor lighting, such as commercial building lighting, airport running road beacon, elevated fluorescent lampshade and stage and security lighting, which has not attracted attention in China. 4 field of building materials: as a new type of building materials, the application of PC board in the domestic building materials market has just been recognized by people. For example, the common building decoration material in recent years, PC transparent board, is rapidly increasing in market consumption. In addition to the roof of large stadiums, stations and shopping centers, it has penetrated into the decoration of some families. PC window glass has not been widely used in China. In this application field, the market competitors of PC are acrylic acid and ester resin, the latter is superior to PC in weather resistance and product price. 5 sound insulation board / wall: the sound insulation board / wall of expressway, high-speed railway and urban expressway is the new application growth point of PC. Due to the rapid development of expressway, high-speed railway and urban expressway construction in the world (including China), the demand for sound insulation is also growing rapidly. PMMA and PC are mainly used in this field. PMMA has the advantage of low price, but its comprehensive performance is not as good as PC, so the application of PC in this field will grow rapidly. Hollow grid production line www.handern.com
Author：admin