PP PGB601H┯TPEE耐由 ‖。PP RP343N、‖。PP 3429、EVA LD-730、TPU A85E4993、TPE DGX7600、PBT 5710G30-S2-BK、→，PMMA FILB72、PP 1043N、‖。PA6 V50H1.0、→，LDPE FC243-51、PA66 301G-15、→，PA66 CM6021M、PBT 200FP、HDPE M40060SPEI LTX901A 、→，LLDPE 3039U、→，PTFE E2、‖。PP H307G6‖。 2820A、‖。PA6 B50L 01 -、‖。POM TS-25A、‖。PA6 BZ1PA11 M2468、‖。PC PDX-D-96573、→，LLDPE L62030B、PCN-2002、‖。TPU 1185A‖。 2128、→，ETFE 2F005、‖。PBT X7396、PC LD7890、PA66 A218V25NAT、→，PA6 F132-C1、‖。PA6 KN133G33HIBK、PP 21MB777、‖。POM S9063、PC2000、→，PA12 ZN9000 、→，PC/ABS 2500UV、COC 480S、→，TPE DGR6470NC、PA66 FR7025V0F、→，POM KP002 、PBT HV1010、→，SURLYN 9320W‖。 1528L、PP 7075L1PETG JN100、PPS 1140LC6、PP SB9302、→，PA6 8272GHS、ABS GR-2020GPETG KN200、PPS MT9140L4、→，LDPE SX-0470:CM424、→，PPE ESD1700、→，LDPE 20018、‖。POM LW301、→，LDPE 22G564、→，PP BE50-7032、PBT 3165、PC/ABS CP6050、→，EVA MV1030 PA66/PTFE RFL-4033、ABS E211LNS013、PP MB008S 、‖。PP ML008、TPV A88SCI-HF、→，POM M90UV 、→，PC HFD4271、→，LLDPE 15150J、‖。PEI 2300EPR-7301、→，TPU 688A50N、PC ML7694、PA66 LSG-440A-H、PBT GP2100、PP The poduction pocess of polypopylene copolyme can be divided into two kinds accoding to the diffeent catalysts. One is metallocene catalyst, the othe is an impoved Ziegle-Natta efficient catalyst. The metallocene catalyst h only one active cente compaed with the Ziegle-Natta catalyst, while the Ziegle-Natta catalyst h multiple active sites. metallocene catalysts can pecisely contol molecula weight and its distibution, the content of monome and its distibution and cystal stuctue on polyme chains. The application of Ziegle-Natta catalyst in PP copolymeization is chaacteized by simple poduction pocess, low enegy consumption, high molecula nucleation and polyme fomance.Cosslinking modificationThe cosslinking modification of polypopylene is an effective way to impove the themal defomation tematue of polypopylene, and also impove the mechanical poties of polypopylene. Cosslinking modification mainly includes adiation cosslinking and chemical cosslinking. Radiation cosslinking is a fee adical and coss-linking eaction of the molecula chain of polypopylene unde the action of high enegy ays. Chemical cosslinking is eally used to add to PP an initiato, and the cosslinking at is added to the cosslinking eaction. Duing the cosslinking modification of polypopylene, the degadation and cosslinking eaction exist simultaneously. The cosslinking efficiency is elatively low when using adiation cosslinking, while chemical cosslinking is eally used to pomote cosslinking eaction by adding auxiliay cosslinking system with Blending modification is a simple and effective modification method. It can be blended with othe plt, ubbe o themopltic eltomes with PP to pepae polyme alloys with both poties of these polymes. The blending modification of polypopylene can impove the low tematue impact esistance, tanspaency, coloing and antistatic poties of the polyme. Because the blending modification h the advantages of simple oation, shot poduction cycle and suitable fo ms poduction, the development of blending is vey apid. Commonly used in polypopylene modified polyme polyethylene (PE) and polyamide (PA) and ethylene popylene ubbe (EPR), thee EPDM (EPDM), butadiene ubbe (ER) and styene butadiene styene block copolyme (SBS), ethylene vinyl acetate copolyme (EVA) etc.. EPDM, SBS and EVA eltome blended with PP, eltic paticles in the mateial can absob e of the impact enegy, and a stess concentation to induce at and inhibition of cack gowth, the PP changes fom bittle factue to ductile factue, the impact stength is geatly impoved, effectively impove the toughness of PP. The blending of PA, ABS and othe igid polymes with PP can ensue the stength and igidity of the mateial at the same time. Howeve, because these igid polymes ae pola polymes, the compatibility of these polymes with PP is poo, and the po compatibilization system must be added to the modification.TPV Dying: dy teatment is not equied if the stoage is appopiate.Melting tematue: the melting point of PP is 160-175 C, the decomposition tematue is 350 C, but the tematue setting can not exceed 275 C duing the injection pocessing. The tematue of the melting section is best at 240.Mold tematue: the mold tematue is 50-90 degees C, fo the high equiement of the size of the high mold tematue, the coe tematue is lowe than 5 degees centigade.Injection pessue: high injection pessue (1500-1800ba) and pessue holding pessue (about 80% of the injection pessue). At about 95% of the full stoke, the einsuance pessue is used, and the longe holding time is used.Injection speed: in ode to educe intenal stess and defomation, high speed injection should be chosen, but e gades of PP and die ae not applicable (bubbles and ai lines). Low velocity injection and highe mold tematue should be used if the suface of the patten h a bight and dak finge that is spead by the gate.The unne and gate unne diamete: 4-7mm, needle gate length 1-1.5mm, diamete up to 0.7mm. The shote the edge of the gate, the shote the bette, it is about 0.7mm, the depth is half of the wall thickness, the width is two times of the wall thickness, and it incees with the length of the melt flow in the die cavity. The mold must have good exhaust fomance, and the exhaust pot is 0.025mm-0.038mm deep and 1.5mm thick. To avoid shinkage mak, we must use lage and ound nozzle and cicula channel, and the thickness of einfocing ib is small (fo example, 50-60% of wall thickness). The poducts made by homopolyme PP ae not moe than 3mm in thickness, othewise thee will be bubbles (the thick wall poducts can only be PP).Back pessue of melt adhesive: the back pessue of 5ba glue can be used, and the back pessue of the colo powde can be poly adjusted.Post-pocessing of poducts: in ode to pevent the shinkage and defomation of the post cystallized poducts, the poducts ae usually soaked in hot wate.applicationHousehold Electic AppliancesHDPE copolymeized monome. This change is eally meued by the density, and the density is linealy elated to the cystallization ate. The United States is eally clsified accoding to TM D1248, the density of HDPE is above 0.940g/CC, and the density ange of medium density polyethylene (MDPE) is 0.926 to 0.940g/CC. Othe clsifications ae etimes clsified MDPE in HDPE o LLDPE. The homopolyme h the highest density, the maximum igidity, the good anti meability and the highest melting point, but eally h the vey poo esistance to envionmental stess cacking (ESCR). ESCR is the ability of PE to esist cacking caused by mechanical o chemical stess. Highe density eally impoves mechanical stength, such tensile stength, stiffness and hadness, themal poties such softening point tematue and hot defomation tematue, and meability esistance, such ai meability o wate vapo meability. Low density impoved the impact stength and ESCR. The polyme density is mainly influenced by the addition of the copolymeized monomes, but less to the molecula weight. The centage of high molecula weight decees the density slightly. Fo example, the homopolyme h a diffeent density in a wide ange of molecula weight.Poduction pocessHighe molecula weight leads to a highe viscosity of the polyme, but the viscosity is also elated to the tematue and shea ate used in the test. The molecula weight of the mateial is chaacteized by heological o molecula weight meuements. The molecula weight ange of HDPE is eally 40000~300000, and the weight aveage molecula weight is oughly coesponding to the melting index ange, that is, fom 100 to 0.029g/10min (230 2.16kg). In eal, highe Mw (lowe melting index MI) enhanced melt stength, bette toughness and ESCR, but highe Mw made pocessing.The pocess is moe difficult o equies highe pessue o tematue.Molecula weight distibution (MWD): the WD of PE vaies fom naow to wide accoding to the catalyst and pocess used.The most commonly used MWD meuement index is the unevenness index (HI), which is equal to the weight aveage molecula weight (Mw) divided by a numbe aveage molecula weight (Mn). The index ange of all HDPE gades is 4 - 30. Naow MWD povides low waping and high impact in the molding pocess. The medium to wide MWD povides the machinability fo most of the extusion pocesses. Wide MWD can also impove melt stength and ceep esistance.Additive
