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How to use modified PP plastic methods
Time: 2018-08-30 12:08 Author: admin Hits: Times
Recycled polypropylene modified plastics have low tensile strength, generally about 18-25MPa, and short glass fiber (SGF) tensile strength can reach about 30-35MPa. In order to improve the interfacial properties of fibers and resins, commonly used coupling agents are KH550, KH560, KH570 and so on. The amount of coupling agent is generally 0.2% and 1.5% of the fiber content. It is necessary to test and determine different conditions.
Chlorination recovery of polypropylene polypropylene polypropylene modified plastics can also be chlorinated like polyethylene, and chlorinated products have been widely used. If it can be chlorinated and chlorinated, it has excellent adhesive properties, and can be used as an adhesive to combine PE, PVC, PA, metal and other materials, adhesives and other packaging composite films, double-layer PP modified plastic films, PP modified plastics Film, paper, PP modified plastic film, aluminum foil, etc.
Polypropylene modified by chemical modification, graft copolymerization and block copolymerization. The purpose of graft modification of polypropylene is to improve the adhesion and dissolution properties of polypropylene and metals, polar plastics and inorganic fillers. Grafting monomers commonly used are acrylic acid and its esters, maleic anhydride and its esters, and maleimide.
The grafting methods are: radiation method, high energy ray grafting method, solution method, copolymerization of peroxide initiator in solvent; melt stirring method, mixing in the presence of peroxide, mixing and grafting in the molten state, This is usually done in a twin-screw extruder.
The properties of the modified polymer material are related to the physical and chemical properties of the graft material, and to the content of the graft material and the length of the graft chain. The basic properties of the polymer are similar to polypropylene, but the compatibility with polar polymer materials, inorganic materials and rubber has been greatly improved. The crystallinity and melting point of polypropylene-modified plastics are related to grafting. Increasing the branch content increases transparency and low-temperature heat-seal volume.
The cross-linking modification of recycled polypropylene can also be cross-linked with polyethylene, and its modification mechanism is similar to the polyethylene cross-linking introduced previously. Pyrolysis of polypropylene and pyrolysis of polypropylene can be carried out in 380-C pyrolysis, which can be used for thermal cracking and catalytic cracking. The silicon / aluminum powder (Si02 / Al: 03) was used as a catalyst to contact the gas-liquid phase of the pyrolysis product.
The results show that with the increase of the amount of catalyst, the liquid yield can be increased, while the amount of gas and residue is reduced. The type of catalyst has little effect on the yield and composition. Temperature has an effect on the cracking reaction. As the temperature increases, the liquid yield increases, the residue content decreases, and the gas volume decreases slightly.
The pyrolysis atmosphere has an effect on the pyrolysis products, and water vapor cracking will increase the rate of liquid formation. In addition, except for the products of the self-cracking products of each polymer, no other waste plastic mixture was found, that is, there was no interaction in the cracking reaction, such as a synergistic reaction.