1. High-density polyethylene (HDPE)
HDPE yog non-toxic, tasteless thiab tsw, nrog ib tug ceev ntawm 0.940-0.976g / cm3.Nws yog cov khoom ntawm polymerization nyob rau hauv tsis tshua muaj siab nyob rau hauv lub catalysis ntawm Ziegler catalyst, yog li high ntom polyethylene kuj hu ua tsis tshua muaj siab polyethylene.
Qhov zoo:
HDPE yog ib hom thermoplastic resin nrog siab crystallinity thiab non-polarity tsim los ntawm copolymerization ntawm ethylene.Cov tsos ntawm thawj HDPE yog milky dawb, thiab nws yog translucent rau qee yam hauv seem nyias.Nws muaj kev tiv thaiv zoo rau feem ntau cov tsev neeg thiab cov khoom siv tshuaj, thiab nws tuaj yeem tiv taus corrosion thiab tawg ntawm cov oxidants muaj zog (concentrated nitric acid), acid-base ntsev thiab cov kuab tshuaj organic (carbon tetrachloride).Lub polymer yog non-hygroscopic thiab muaj dej vapor tsis kam thiab tuaj yeem siv rau kev ya raws thiab dej tsis kam.
Qhov tsis txaus:
Qhov tsis zoo yog tias nws qhov kev laus tsis kam thiab kev ntxhov siab ib puag ncig tsis zoo li LDPE, tshwj xeeb tshaj yog thermal oxidation yuav txo nws cov kev ua tau zoo, yog li HDPE ntxiv cov tshuaj tiv thaiv antioxidants thiab UV absorbers thaum nws ua rau hauv cov yas coils los txhim kho nws cov kev ua tau zoo.ua tsis tau.
2. Tsawg-density polyethylene (LDPE)
LDPE yog non-toxic, tasteless thiab tsw, nrog ib tug ceev ntawm 0.910-0.940g / cm3.Nws yog polymerized nrog oxygen los yog organic peroxide raws li catalyst nyob rau hauv siab ntawm 100-300MPa.Nws tseem hu ua high-pressure polyethylene.LDPE feem ntau hu ua PE yeeb nkab hauv kev lag luam dej.
Qhov zoo:
Tsawg-density polyethylene yog qhov sib sib zog nqus ntawm polyethylene resins.Piv nrog HDPE, nws cov crystallinity (55% -65%) thiab softening point (90-100 ℃) yog qis dua;nws muaj qhov yooj yooj yim, extensibility, pob tshab, txias tsis kam thiab kev ua haujlwm;nws cov tshuaj zoo stability, acid, alkali thiab ntsev aqueous tov;zoo hluav taws xob rwb thaiv tsev thiab huab cua permeability;kev nqus dej tsawg;yooj yim hlawv.Nws yog mos nyob rau hauv cov xwm thiab muaj zoo extensibility, hluav taws xob rwb thaiv tsev, tshuaj stability, kev ua tau zoo thiab kub tsis kam (tuaj yeem tiv taus -70 ° C).
Qhov tsis txaus:
Qhov tsis zoo yog tias nws lub zog txhua yam, qhov cuam tshuam tsis zoo, cov khoom siv roj thiab cov kuab tshuaj tsis zoo.Cov qauv molecular tsis tu ncua txaus, crystallinity (55% -65%) yog qhov tsawg, thiab crystalline melting point (108-126 ° C) kuj qis.Nws lub zog txhua yam yog qis dua li ntawm high-density polyethylene, thiab nws cov impermeability coefficient, tshav kub tsis kam thiab hnub ci aging kuj tsis zoo.Antioxidants thiab UV absorbers tau ntxiv los kho nws qhov tsis txaus.
Post lub sij hawm: Aug-17-2022