PP回收(PP recycling).doc
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1、PP回收(PP recycling)recyclingOne PP woven bag recyclingL materialWaste PP woven bags: collected from waste products by 800 yuan/fPurchase;SgS: yueyang chemical plant production;SIS: yueyang chemical plant production;EVA: low vinyl acetate, 100 (2) meltingIndex MI: 1.37 g / 10 n (100 * C, 5kg);POE: M I
2、: 0.876 g/lOnfm (230 12,2. (6kg) American production;Carbon black: chongqing yongchuan chemical plant production.2. The equipmentThin film granulator: diameter of 65t120mm; Length to diameterRatio = 13:1; The number of threads is 13; Slot width 65ram; Spiral depth 20ram; Screw width 10rrma; Screw sp
3、eed 1 5-150rmp; Motor power 18.5 kW; Cutting motor power 0.75 kW.125g injection molding machine: used for injection molding tensile strength test spline, impact strength test bar, hardness test sample and appearance sample.3. InstrumentationTest machine factory of melt flow rate meter; Plastic rockw
4、ell hardness tester factory; XNR 1 400, changchun 2 XHR 1 150, Shanghai materials 1ZOD cantilever impact tester: UJ 1 4, chengde test machine factory; Hydraulic universal testing machine: WE + 50B, changchun test machine factory.Process of 4.(1) materialTo dry in the sun, remove the cotton thread fr
5、om the seaming, shake off the sand and the residues of the packaging (such as cement, fertilizer, etc.).(2) extrude granulationUsing thin film granulator granulator, the temperature control of the granulator is as follows:The first paragraph (feed end) : 150 ; The second paragraph: 155 ;The third pa
6、ragraph: 160 ; The fourth section: l70 .The woven bag is sent in one by the loading port, and under the dual effect of the heat of the cylinder and the shear force of the screw, the woven bag becomes the melting state of PP at the end of the cylinder.The melting bodies are extruded from a number of
7、small holes (aperture 2mm) in the mold head of the granulation machine. At the outlet of the hole is a smooth circular plane, which is perpendicular to the extruding direction of the extruder. There are two - to - 180 cutting knife, the edge of the blade is close to the plane, and it is rotated cloc
8、kwise in the direction of the cutting motor. The cutting motor speed can be adjusted by adjusting the speed of the cutter motor and adjusting the length of the cut. There are round walls (or thick wall battalions) of 50ram on the four sides of the die plane, and many of them are evenly distributed a
9、round the circular wall. Through these small holes, the viscous PP melt is cooled by spraying water cold water on the circular die surface, and the cutter face is used to cut the grain. The particles under the cutting continue to cool under the water spray and keep the particles from sticking to eac
10、h other. The cooling water that is sprayed into the surface of the die, and the particles that are cut off are separated from the water by the filter, and the PP recycling granules with a small amount of water are sent to the cyclone separator by the 5m long air duct. In the wind tunnel and cyclone
11、separator, water is taken away. The dry PP recovery granules are released from the bottom of the cyclone separator and packed in a woven bag. If the dewatering of PP is not ideal, it can be dry again.(3) toughening modificationIn the above PP charge, A suitable PP is toughened and A little carbon bl
12、ack, the mixture is mixed and then put into the injection molding machine hopper, and the sample injection molding is made. The proportion of ingredients and toughening effect are listed in table 1. The carbon black is used for coloring and the PP recycling is dyed black.The process temperature cont
13、rol of the injection molding machine is as follows:The first paragraph (feed end) : l7O ; The second paragraph: 200 ; The third section; 200 C;Nozzle temperature: appropriate; Mold temperature: 40 or less.Second, the conclusionWe measured the Beijing yanshan chemical corporation production of ethyle
14、ne propylene random impact strength of PP 1330 / m2, 10.81 d homopolymerization polypropylene impact strength of the 1300 5 81 d/m2. It shows that through the toughening modification, in addition to the EAA, waste PP woven bag impact strength of recycled aggregate are able to achieve, even more than
15、 the level of the fresh homopolymerization polypropylene, and add the SIS andThe PO E is more than the fresh and random polynene 1330 level. On the waste PP woven bag adding appropriate varieties, the right amount of recycled aggregate flexibilizer, can make the waste PP woven bag increase the perfo
16、rmance of the recycled aggregate to fresh propylene homopolymerization tired 1300 performance levels. You can even reach the performance level of fresh tired of PP 1330. Running, convenient operation, smooth control. The process of production materials and the comprehensive utilization of acidic wat
17、er, not only to achieve zero discharge of the wastewater, and achieved economic lessons, the unity of the social benefit and environmental benefit.In the waste PP woven bag recycling granules, suitable varieties and a suitable amount of toughening agent can improve the performance of waste PP woven
18、bag recycling granules to the performance level of the fresh polypropylene 1300To reach the performance level of fresh co-polypropylene 1330.The recycling of PP car bumpers1.1 polypropylene copolymer/elastomer mixturePp blending modification is made of compatibilizers, strengthening agent, filling a
19、gent, coupling agent, crosslinking agent, the melt index of regulator and anti-aging agent and other materials and polypropylene blend, modified polypropylene, greatly improve its performance. The application of polysynthetic rubber and PP to improve the low temperature toughness of PP is the tradit
20、ional process of producing PP bumpers. Most bumpers are used to toughen EPDM.1.2 block copolymer PP/polyolefin thermoplastic elastomer (TPE) blendsSome brands of polyolefine thermoplastic elastomers, like EPR, can give PP a good low temperature toughness, and it is also good for blending. Another re
21、ason to adopt TPE is that TPE particles do not need to be likeSuch EPR for broken pieces again after mixing with PP resin blend (sometimes without vulcanization processing), and TPE granules and PP particles can be in the process of using proportional mixing, directly add to the injection molding ma
22、chine for processing, which can reduce the cost.1.3 PP/EPDM reactor mixturesWith the continuous improvement of the catalyst, two series gas-phase polymerization technology can be used to produce high quality anti-impact PP with high rubber content. By raising the ethylene content and control the dif
23、ferent methods of vinyl monomer into PP macromolecular chain, can not only get toughness good products, also can be in a certain range adjust polymer, comonomer content relative relation between the rigidity and toughness of the same material, to obtain the required performance of new materials. Thi
24、s material is a mixture of PP and ethylene-propylene rubber, which is known as the PP/EPDM type reactive blend. At present domestic car bumpers mostly choose polypropylene copolymer/elastomer.Although EPDM has a good toughening effect on PP, EPDM prices are high, and it is difficult to break the glu
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