Melt blown nonwovens production line
DATE：2021/5/22 8:31:12 / READ： / SOURCE：This station
Melt blown nonwovens production line
Blending modification of polycarbonateAt present, the global PC has developed towards high functionality and specialization. PC can be mixed with many kinds of polymers, and the most important one is blending with polyene, ABS and PBT. P / ABS alloy has excellent comprehensive properties and is the main variety of PC alloy. PC / ABS alloy not only has the heat resistance, mechanical strength and dimensional stability of PC, but also can reduce the viscosity of PC body, improve processing performance, reduce the sensitivity to thick wall and low temperature, improve toughness and reduce material cost. The melt viscosity of PS is small and the processability is good. Blending a small amount of PS with PC can obviously improve the processing fluidity of PC, thus improving the formability of PC and reducing the birefringence of PC. PS can also play the role of rigid organic filler in PC and improve the hardness of PC; The addition of PS can also reduce the cost. Therefore, 2pc / PS alloy is a kind of high performance and economical polymer material. Because PC and PS are incompatible systems, it is necessary to add compatibilizer to improve the compatibility of the two phases and solve the problem of their incompatibility, which is the key technology to prepare PC / PS alloy. Adding PE to PC can improve the thick wall impact toughness of PC; The impact strength of PC / PP Alloy Prepared by blending PC with PP is higher than that of PC. The blending of PC with PBT or pet can not only improve the stress cracking resistance and solvent resistance of PC, reduce the cost of PC, but also improve the heat resistance and ductility of PBT or pet. PC / PBT Alloy and PC / Pet alloy have become an important kind of engineering plastics. They have high industrial application value and are widely used in electronic and electrical parts, machinery, automobile parts and other fields. Adding people to PC can improve the oil resistance, chemical resistance, stress cracking resistance and processing performance of PC, and reduce the cost of PC. The products made of ring meal are made of alloy A. when the capital fraction for compatibilization is more than A5, the interface of trade book becomes unclear, and the properties of alloy are improved. PC / POM alloy has excellent mechanical properties, bath resistance and stress resistance. Its heat resistance is higher than that of propellant and hot cross temperature can reach 1450,
PC / P alloy and PC / P alloy. PC monthly Po can improve the impact resistance of PC, improve the processing fluidity of PC and reduce the internal stress of products. At the same time, it can also improve the tensile strength and elongation at break of PC. besides the cost of batch P. In PC, the impact of human and accessible P makes PC and less sold PE share the same situation. The results show that the impact strength of PC is increased by 4%, the viscosity of tower body is decreased, and the tensile strength and bending strength are almost unchanged. PC was mixed with 15% PP. The impact strength of the alloy is higher than that of PC. PC / PO alloy has been commercialized in foreign countries. These products have high impact strength, especially the total arm dyeing impact strength is 4 times higher than PC, and can resist high temperature disinfection, easy processing, good fluidity, boiling water resistance, stress cracking resistance. They are suitable for making food tableware, containers, safety helmets, electrical parts, electric tool shells and textile weft tubes.
The solubility parameters of PC and Po are quite different, and they belong to polar and nonpolar polymers, respectively. In addition, PC is a non knot polymer, while Po is a semi knot polymer. Moreover, the difference of flow temperature between PC and Po is large. Due to the differences between PC and Po, PC / PO is an incompatible system. However, when a small amount of PE (< 10%) is blended with PC, the notched impact strength of PC can be increased, the melt viscosity can be greatly reduced, and other properties of PC are almost unaffected. However, when the content of PE is high, because of the incompatibility of the two components, it is difficult to control the morphology of the blend system when the two components are simply blended, the physical and mechanical properties of the material are unstable, the products are layered, and lose the use value. Therefore, improving the compatibility of PC / PO system is the key to obtain PC / PO alloy with excellent properties. There are two compatibilizing technologies for PC / PO alloy, namely reactive compatibilizer and additive compatibilizer.
Reactive compatibilization is to modify PO by grafting, introduce polar groups which can react with PC into Po, and then blend with PC. In the blending process, the in-situ compatibilization, the improvement of the two-phase interface to the dry junction, the polar monomers and epoxy compounds, such as maleic anhydride / glycidyl methacrylate, etc.
Author：admin