Dab tsi yog qhov txawv ntawm LDPE thiab PE?
LDPE vs. PE: Nkag siab qhov sib txawv tseem ceeb hauv cov khoom thiab kev siv
polyethylene (PE) yog cov khoom siv yas ntau yam nrog ntau yam kev siv. Txawm li cas los xij, muaj ntau hom PE, txhua tus muaj nws cov khoom tshwj xeeb thiab siv. Ob hom yog polyethylene low-density polyethylene (LDPE) thiab polyethylene (PE).
1. Khoom
LDPE yog tus cwj pwm los ntawm nws qhov ntom ntom qis, hloov tau yooj yim, thiab tawv. Nws muaj qib siab ntawm crystallinity, uas ua rau nws zoo li waxy thiab ua rau nws resistant rau tshuaj thiab ya raws. PE, ntawm qhov tod tes, yog denser thiab muaj zog dua LDPE. Nws kuj yog nruj dua thiab muaj qhov melting point ntau dua.
2.Kev thov
Cov khoom sib txawv ntawm LDPE thiab PE ua rau lawv siv hauv cov ntawv sib txawv. LDPE feem ntau yog siv rau hauv ntim zaj duab xis, hnab yas, thiab nyem lub raj mis vim nws yooj yim thiab tsis kam mus rau cov tshuaj. Nws kuj yog siv rau hauv hluav taws xob rwb thaiv tsev thiab hlau coatings.
PE yog siv rau hauv ntau yam kev siv, nrog rau cov kav dej, lub raj mis, cov khoom ua si, thiab cov khoom siv tsheb. Nws lub zog thiab rigidity ua rau nws tsim nyog rau kev siv cov qauv, thaum nws tsis kam mus rau cov tshuaj thiab ya raws ua rau nws zoo tagnrho rau siv nyob rau hauv ntim thiab ntim.
3. Kev ua haujlwm
LDPE thiab PE tuaj yeem ua tiav siv ntau txoj hauv kev, suav nrog extrusion, txhaj tshuaj molding, thiab tshuab moulding. Txawm li cas los xij, kev ua haujlwm rau txhua hom PE yog txawv. LDPE yuav tsum tau ua kom qis dua qhov kub thiab txias dua li PE, thiab nws tuaj yeem ua tiav sai dua.
4. Kev txiav txim siab ib puag ncig
Ob leeg LDPE thiab PE yog rov ua dua tshiab, tab sis lawv qhov cuam tshuam ib puag ncig txawv. LDPE yog siv tau yooj yim dua li PE, thiab nws muaj cov pa roj carbon tsawg dua. Txawm li cas los xij, ob hom PE tuaj yeem ua rau muaj kuab paug yas yog tias lawv tsis muab pov tseg kom zoo.
5.Xyooj
LDPE thiab PE yog ob yam tseem ceeb ntawm polyethylene nrog cov khoom sib txawv thiab kev siv. LDPE yog tus cwj pwm los ntawm nws qhov ntom ntom ntom ntom, yooj yim, thiab tawv, thaum PE yog Denser, muaj zog dua, thiab ntau dua. Cov kev sib txawv no ua rau txhua hom PE haum rau kev siv sib txawv, los ntawm kev ntim khoom mus rau cov khoom siv. Nkag siab txog qhov sib txawv tseem ceeb ntawm LDPE thiab PE yog qhov tseem ceeb rau kev xaiv cov khoom tsim nyog rau ib daim ntawv thov tshwj xeeb.
Sib piv LDPE thiab PE: Phau Ntawv Qhia Kom Paub Txog Cov Khoom Siv
Tsawg-density polyethylene (LDPE) thiab polyethylene (PE) yog ob qho khoom siv yas siv nrog cov khoom sib txawv thiab kev siv. Kev nkag siab txog lawv qhov sib txawv yog qhov tseem ceeb rau kev xaiv cov khoom tsim nyog rau cov kev cai tshwj xeeb.
1.Molecular Structure thiab ntom
LDPE thiab PE sib koom tib yam tshuaj muaj pes tsawg leeg (C2H4)n, tab sis txawv ntawm lawv cov qauv molecular. LDPE muaj ib tug branched molecular qauv, thaum PE muaj ib tug linear los yog me ntsis branched qauv. Qhov sib txawv ntawm cov ceg no cuam tshuam qhov ntom ntawm cov ntaub ntawv, nrog LDPE muaj qhov ntom ntom (0.91-0.94 g / cm3) dua li PE (0.94-0.97 g / cm3).
2.Mechanical Properties
Cov qauv molecular kuj cuam tshuam rau cov khoom siv kho tshuab ntawm LDPE thiab PE. LDPE yog hloov tau yooj yim dua thiab ductile dua PE vim nws cov qauv ceg, uas tso cai rau cov saw hlau ntau dua. PE, ntawm qhov tod tes, yog nruj thiab muaj zog, tshwj xeeb tshaj yog nyob rau hauv daim ntawv linear.
3.Thermal Properties
LDPE muaj qhov qis dua melting point (110-120 ° C) thiab siab dua iav hloov kub (Tg) (-120 ° C) piv rau PE. Qhov no txhais tau tias LDPE ua mos thiab pliable ntawm qhov kub thiab txias, thaum PE tseem nruj kom txog thaum kub dua.
4.Chemical Resistance
Ob leeg LDPE thiab PE muaj cov tshuaj tiv thaiv zoo heev rau feem ntau cov kua qaub, cov hauv paus, thiab cov kuab tshuaj. Txawm li cas los xij, LDPE tiv taus qee yam tshuaj, xws li tshuaj chlorine thiab oxidizing cov neeg ua haujlwm.
5.Kev thov
Cov khoom sib txawv ntawm LDPE thiab PE ua rau lawv haum rau ntau yam kev siv. LDPE feem ntau yog siv rau hauv kev ntim khoom yooj yim, cov yeeb yaj kiab, thiab lub hnab vim nws qhov yooj yim thiab qhov ntom ntom. PE, tshwj xeeb tshaj yog linear PE (LLDPE thiab HDPE), yog siv rau hauv cov ntawv thov kom muaj zog thiab nruj dua, xws li cov kav dej, lub raj mis, thiab cov khoom siv tsheb.
6.Xyooj
LDPE thiab PE yog cov khoom siv yas ntau yam nrog cov yam ntxwv tshwj xeeb uas txiav txim siab lawv qhov tsim nyog rau cov ntawv thov tshwj xeeb. LDPE muaj qhov yooj yim thiab qhov ntom ntom, thaum PE muab lub zog thiab rigidity. Kev nkag siab txog qhov sib txawv ntawm cov ntaub ntawv no yog qhov tseem ceeb rau kev xaiv cov khoom zoo tshaj plaws rau lub hom phiaj, kom ntseeg tau tias kev ua haujlwm zoo thiab ua haujlwm ntev.
LDPE vs. PE: Kev Ntsuam Xyuas Kom Paub Txog Kev Ua Haujlwm thiab Kev Txiav Txim Siab
Tsawg-density polyethylene (LDPE) thiab polyethylene (PE) yog ob qho khoom siv yas siv nrog cov khoom sib txawv thiab kev siv. Kev nkag siab txog lawv qhov sib txawv yog qhov tseem ceeb rau kev xaiv cov khoom zoo rau cov kev xav tau tshwj xeeb.
1.Composition thiab Structure
LDPE yog ib tug branched polymer, txhais tau tias nws molecular chains muaj sab ceg. Qhov no branching txo qhov ceev thiab crystallinity ntawm LDPE piv rau PE. PE, ntawm qhov tod tes, yog linear polymer nrog tsawg kawg nkaus branching, uas ua rau ib tug ntau dua ntom thiab crystallinity.
2. Khoom
Cov ceg hauv LDPE imparts yooj, toughness, thiab cuam tshuam tsis kam. Nws kuj yog pob tshab ntau dua thiab muaj qhov qis qis dua li PE. PE, nrog nws cov qauv linear, pom muaj zog dua, tawv, thiab tawv. Nws kuj yog opaque ntau dua thiab muaj cov ntsiab lus melting ntau dua.
3.Kev thov
LDPE qhov yooj yim thiab cuam tshuam ua rau nws haum rau cov ntawv thov xws li ntim cov yeeb yaj kiab, hnab, thiab cov khoom ua si. Nws cov pob tshab tso cai rau kom meej ntim, thaum nws cov ntsiab lus melting tsawg pab txhawb kev sib khi thaum tshav kub kub. PE, nrog nws lub zog thiab nruj, yog siv rau hauv cov ntawv thov xws li cov kav dej, lub raj mis, thiab cov khoom siv tsheb. Nws cov ntsiab lus melting siab dua ua kom muaj qhov ruaj khov ntawm qhov kub siab.
4.Cov nqi txiav txim siab
LDPE feem ntau kim dua PE vim nws cov txheej txheem ntau lawm. Txawm li cas los xij, nws qhov yooj yim thiab cuam tshuam tsis kam tuaj yeem ua pov thawj tus nqi siab dua rau qee yam kev siv. PE, nrog nws cov nqi qis dua thiab muaj zog dua, feem ntau nyiam rau cov ntawv thov uas cov khoom no tseem ceeb heev.
5. Kev txiav txim siab ib puag ncig
Ob leeg LDPE thiab PE yog recyclable, tab sis lawv cov nqi rov ua dua sib txawv. LDPE muaj qhov rov ua dua tshiab dua vim nws siv dav hauv ntim. Txawm li cas los xij, muaj cov ceg ntoo sab hauv LDPE tuaj yeem ua rau nws nyuaj rau rov ua dua li PE.
6.Xyooj
LDPE thiab PE yog cov khoom siv yas ntau yam nrog cov khoom sib txawv thiab kev siv. LDPE muaj qhov yooj yim, tawv, thiab pob tshab, thaum PE muab lub zog, tawv, thiab tawv. Qhov kev xaiv ntawm cov ntaub ntawv no nyob ntawm qhov kev xav tau tshwj xeeb ntawm daim ntawv thov, xav txog kev ua haujlwm, tus nqi, thiab ib puag ncig yam. Los ntawm kev nkag siab txog qhov sib txawv ntawm LDPE thiab PE, cov kws tsim khoom thiab cov neeg tsim qauv tuaj yeem txhim kho kev xaiv cov khoom siv rau kev ua haujlwm zoo thiab kev siv nyiaj.
