Lub cev thiab tshuaj muaj zog ntawm Polyethylene Resin
Lub cev thiab tshuaj muaj zog ntawm Polyethylene Resin
Tshuaj khoom
Polyethylene muaj tshuaj ruaj khov zoo thiab tiv taus dilute nitric acid, dilute sulfuric acid thiab ib qho concentration ntawm hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia dej, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide, thiab lwm yam. .xov. Tab sis nws tsis muaj zog oxidative corrosion, xws li fuming sulfuric acid, concentrated nitric acid, chromic acid thiab sulfuric acid sib tov. Nyob rau hauv chav tsev kub, cov kuab tshuaj uas tau hais los saum toj no yuav maj mam erode polyethylene, thaum nyob rau ntawm 90-100 ° C, concentrated sulfuric acid thiab concentrated nitric acid yuav sai sai erode polyethylene, ua rau nws puas los yog decomposed. Polyethylene yog ib qho yooj yim rau kev yees duab-oxidized, thermally oxidized, decomposed los ntawm ozone, thiab yooj yim degraded nyob rau hauv qhov kev txiav txim ntawm ultraviolet rays. Cov pa roj carbon dub muaj lub teeb tiv thaiv zoo heev ntawm polyethylene. Cov tshuaj tiv thaiv xws li kev sib txuas, kev sib txuas ntawm cov saw hlau, thiab tsim cov pab pawg tsis muaj zog tuaj yeem tshwm sim tom qab irradiation.
txhua yam khoom
Cov yam ntxwv ntawm polyethylene yog cov noobral, lub zog tensile yog tsawg, lub creep kuj tsis zoo, thiab qhov cuam tshuam kuj zoo. Kev cuam tshuam lub zog LDPE> LLDPE> HDPE, lwm yam khoom siv kho tshuab LDPE crystallinity thiab txheeb ze molecular hnyav, nrog kev txhim kho ntawm cov ntsuas no, nws cov khoom siv kho tshuab nce. Environmental stress cracking resistance tsis zoo, tab sis thaum tus txheeb ze molecular hnyav nce, nws txhim kho. Zoo puncture kuj, uas LLDPE yog qhov zoo tshaj plaws.
Environmental yam ntxwv
Polyethylene yog ib qho alkane inert polymer nrog kev ruaj ntseg tshuaj zoo. Nws yog resistant rau corrosion los ntawm acid, alkali thiab ntsev aqueous daws nyob rau hauv chav tsev kub, tab sis tsis resistant rau muaj zog oxidants xws li oleum, concentrated nitric acid thiab chromic acid. Polyethylene yog insoluble nyob rau hauv ntau cov kuab tshuaj hauv qab 60 ° C, tab sis yuav o los yog tawg nyob rau hauv lub sij hawm ntev kev sib cuag nrog aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, thiab lwm yam. Thaum kub tshaj 60 ° C, nws yuav yaj nyob rau hauv ib tug me me npaum li cas ntawm toluene. , amyl acetate, trichloroethylene, turpentine, kuvral roj thiab paraffin; Thaum qhov kub siab tshaj 100 ℃, nws tuaj yeem yaj hauv tetralnyob rau hauv.
Txij li thaum polyethylene molecules muaj ib tug me me ntawm ob daim ntawv cog lus thiab ether bonds, lub hnub raug thiab nag yuav ua rau kev laus, uas yuav tsum tau txhim kho los ntawm kev ntxiv antioxidants thiab lub teeb stabilizers.
Cov yam ntxwv ua
Vim hais tias LDPE thiab HDPE muaj fluidity zoo, tsis tshua muaj kub ua, nruab nrab viscosity, tsis tshua muaj decomposition kub, thiab tsis decompose ntawm siab kub ntawm 300 ℃ nyob rau hauv inert gas, lawv yog plastics nrog kev ua tau zoo. Txawm li cas los xij, qhov viscosity ntawm LLDPE yog me ntsis siab dua, thiab lub zog tsav yuav tsum tau nce los ntawm 20% mus rau 30%; nws yooj yim rau yaj tawg, yog li nws yog ib qho tsim nyog yuav tsum tau ua kom qhov sib txawv ntawm qhov tuag thiab ntxiv cov kev pab cuam; Kev ua haujlwm kub yog me ntsis siab dua, mus txog 200 txog 215 ° C. Polyethylene muaj qhov nqus dej tsawg thiab tsis tas yuav ziab ua ntej ua haujlwm.
Polyethylene yaj yog cov kua uas tsis yog-Newtonian, thiab nws cov viscosity fluctuates tsawg dua nrog qhov kub thiab txias, tab sis txo qis nrog qhov nce ntawm shear npaum li cas thiab muaj kev sib raug zoo, cov LLDPE muaj qhov qis tshaj.
Polyethylene cov khoom yog yooj yim rau crystallize thaum lub sij hawm txias, yog li ntawd, yuav tsum tau them nyiaj mloog mus rau lub pwm kub thaum lub sij hawm ua. Txhawm rau tswj cov crystallinity ntawm cov khoom, kom nws muaj cov khoom sib txawv. Polyethylene muaj qhov loj molding shrinkage, uas yuav tsum tau txiav txim siab thaum tsim pwm.
Lub cev thiab tshuaj muaj zog ntawm Polyethylene Resin