Tsawg-density polyethylene (LDPE) yog ib qho thermoplastic ua los ntawm monomer ethylene.Nws yog thawj qib ntawm polyethylene, tsim nyob rau hauv 1933 los ntawm Imperial Chemical Industries (ICI) siv cov txheej txheem siab ntawm dawb radical polymerization.Nws cov chaw tsim khoom siv tib txoj kev niaj hnub no.EPA kwv yees li 5.7% ntawm LDPE (cov khoom siv rov ua dua 4) yog rov ua dua tshiab.Txawm hais tias muaj kev sib tw los ntawm cov polymers niaj hnub no, LDPE tseem yog qib yas tseem ceeb.
PTFENws yog cov khoom siv fluorocarbon, vim nws yog cov khoom hnyav molecular uas muaj cov pa roj carbon thiab fluorine tag nrho.PTFE yog hydrophobic: tsis yog dej los yog dej-muaj tshuaj ntub dej PTFE, raws li fluorocarbons qhia mitigated London dispersion rog vim lub siab electronegativity ntawm fluorine.PTFE muaj ib qho qis tshaj coefficients ntawm kev sib txhuam ntawm cov khoom.
Kev sib piv ntawm LDPE thiab Polymer PTFE / FEP Property Values
Cov ntaub ntawv siv
Tsawg-density polyethylene (LDPE):
LDPE yog dav siv los tsim ntau lub thawv, xa cov fwj, ntxuav lub raj mis, tubing, hnab yas rau cov khoom siv hauv computer, thiab ntau yam khoom siv kuaj pwm.Nws feem ntau siv yog hauv hnab yas.Lwm cov khoom tsim los ntawm nws muaj xws li:
- * Cov tais thiab cov thawv ntim khoom siv dav dav
- * Corrosion-resistant ua hauj lwm nto
- * Cov khoom uas yuav tsum tau weldable thiab machinable
- * Cov khoom uas xav tau kev hloov pauv, uas nws ua haujlwm zoo heev
- * Cov khoom muag muag heev thiab pliable xws li snap-on hau
- * Rau pob rings
- * Cov kua txiv hmab txiv ntoo thiab cov thawv ntim mis yog ua los ntawm cov kua ntim dej, lub laminate ntawm cov ntawv ntawv thiab LDPE (raws li cov dej tsis muaj dej sab hauv thiab sab nrauv), thiab feem ntau nrog txheej ntawm aluminium ntawv ci (yog li ua aseptic ntim).
- * Ntim rau lub computer hardware, xws li hard disk drives, screen cards, thiab optical disc drives
- * Chaw ua si swb
- * Cov ntaub qhwv yas
Polymer PTFE / FEP:Cabling kev daws teeb meem; Tsis yog lubricated bearings; O-rings; Foob; Capacitors; Semiconductor manufacturing; Kub kub qhov hluav taws xob; Gaskets; Valve Cheebtsam.
Khoom siv:
Tsawg-density polyethylene (LDPE):ib;LDPE yog txhais los ntawm qhov ceev ntawm 0.910-0.940 g / cm3.Nws tsis yog reactive nyob rau hauv chav tsev kub, tshwj tsis yog los ntawm muaj zog oxidizing tus neeg sawv cev, thiab ib co kuab tshuaj ua rau o.Nws tuaj yeem tiv taus qhov kub ntawm 80 ° C tsis tu ncua thiab 95 ° C rau lub sijhawm luv luv.Ua nyob rau hauv translucent los yog opaque variations, nws yog heev saj zawg zog thiab tawv.
b;LDPE muaj ntau ceg (ntawm li 2% ntawm cov pa roj carbon atoms) dua li HDPE, yog li nws cov intermolecular rog (instantaneous-dipole induced-dipole attraction) tsis muaj zog, nws lub zog tensile qis dua, thiab nws cov resilience siab dua.Tsis tas li ntawd, vim tias nws cov molecules tsis nruj nruj thiab tsis tshua muaj crystalline vim yog sab ceg, nws qhov ntom ntom qis dua.
c;Tshuaj tiv thaiv: 1, Kev ua haujlwm zoo heev (tsis muaj kev tawm tsam / tsis muaj tshuaj lom neeg cov tshuaj tiv thaiv) rau dilute thiab concentrated acids, cawv, bases thiab esters; 2, Zoo kuj (me me nres / tsawg heev tshuaj reactivity) rau aldehydes, ketones thiab zaub roj; 3, Kev txwv tsis pub muaj zog (nruab nrab kev tawm tsam / cov tshuaj tiv thaiv tseem ceeb, tsim nyog siv sijhawm luv xwb) rau aliphatic thiab aromatic hydrocarbons, ntxhia roj, thiab oxidizing cov neeg ua haujlwm; 4, Kev tsis zoo, thiab tsis pom zoo siv nrog halogenated hydrocarbons.
Polymer PTFE / FEP:Cov khoom zoo heev dielectric; Inertness rau feem ntau cov tshuaj; kub kub thiab tshuaj tiv thaiv; Tsis tshua muaj coefficient ntawm kev sib txhuam; Cov hluav taws xob zoo heev; xoom noo noo nqus; Resensitive rau lub zog zaus; Machinability.
Post lub sij hawm: Nov-10-2019