Enhanced modification:
The tensile strength of recycled PP is relatively low, and the general product is about 18 to 25 MPa. After being reinforced with short glass fiber (SGF), the tensile strength can reach about 30 to 35 MPa. In order to improve the interfacial properties of fibers and resins, coupling agents such as KH550, KH560, and KH570 are commonly used. The amount of the coupling agent is generally 0.2% to 1.5% of the fiber content. It is necessary to determine the test conditions for different conditions.
Chlorination of polypropylene:
Recovered PP can also be chlorinated like recycled PE. Chloride products have a wide range of applications. For example, APP can be chlorinated to obtain chlorinated APP (CAPP). It has excellent adhesive properties and can be used to make binders for bonding materials such as PE, PVC, PA, and metals. Layer PP film, PP film-paper, PP film-aluminum foil and other adhesives. In addition, CAPP can also be used as a processing aid for coatings, printing inks, and polar resins.
Graft modification of polypropylene:
Polypropylene chemical modification also graft, block copolymer modification. The purpose of polypropylene graft modification is to increase the adhesion or solubilization of polypropylene with metals, polar plastics, inorganic fillers. The grafting monomers used are generally acrylic acid and its esters, maleic anhydride and its esters, maleimides and the like. Grafting methods are: 1 solution method, adding peroxide initiator in the solvent for copolymerization; 2 radiation method, grafting under high-energy radiation; 3 melt-mixing method, in the presence of peroxide, in the molten state Mixing, grafting, and often in a twin-screw extruder. The properties of the graft-modified polymer are related to the physicochemical properties of the graft, but also related to the graft content, the length of the graft chain, etc. The basic properties are similar to that of polypropylene, but with the polar polymer material The compatibility of inorganic materials, rubber, etc. can be greatly improved. The degree of crystallinity and melting point of the grafted PP decreases with the increase of the content of the grafted material, but the transparency and low-temperature heat-sealing property increase.
Cross-linked modification of recycled polypropylene:
Recycled polypropylene can also be cross-linked and modified like polyethylene. The mechanism of modification is similar to the polyethylene cross-linking described earlier.
Catalytic cracking and thermal cracking of polypropylene:
Polypropylene cracks around 380~C and can be thermally cracked and catalytically cracked. With silicon/aluminum powder (Si02/Al:03) as catalyst, the catalyst can be contacted with the gas and liquid phases of the cracked product. Studies have shown that with the liquid phase contact catalyst method, 69% of the liquid product can be obtained, having a boiling point of 30 to 270° C., 2·C6 to n-C1s paraffin oil, and gas phase contact catalysis, obtaining 54% (mass fraction) liquid product. And the speed of getting the product is much lower. Studies on catalytic and non-catalytic degradation show that the degree of unsaturation of the catalytically degraded liquid product is much higher than that of non-catalytic degradation, and the cleavage product is also different.
Polypropylene decomposes around 40013 under the action of a catalyst and can produce a series of substances. Studies have shown that the increase of the catalyst content can increase the liquid yield, while the amount of gas and residue decreases; the type of catalyst has little effect on the yield and composition. The temperature has an effect on the cracking reaction, the temperature increases, the liquid forming rate increases, the percentage of residue decreases, and the amount of gas decreases slightly. The pyrolysis atmosphere has an effect on the pyrolysis product and cracking under a steam atmosphere can increase the liquid formation rate. In addition, no other products other than the cracked products of the respective polymers were found in the mixing of other waste plastics, that is, no interaction such as a synergistic reaction occurred in the cleavage reaction. Under medium-temperature cracking conditions, the liquid formation rate is about 70%, and appropriate improvement techniques can increase the liquid formation rate to about 85%.
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