Misiyano yeLDPE, HDPE, uye LLDPE
Polyethylene ndeimwe yemashanu makuru ekugadzira resin, uye China parizvino ndiyo inotora kunze kwenyika uye yechipiri mutengi mukuru wepolyethylene. Polyethylene inonyanya kukamurwa kuita yakakwira density polyethylene (HDPE), yakaderera density polyethylene (LDPE), mutsara yakaderera density polyethylene (LLDPE) mapoka matatu.
Kuenzanisa kwezvinhu zveHDPE, LDPE uye LLDPE zvinhu
| HDPE | LDPE | LLDPE | |
|---|---|---|---|
| Kunhuwa huturu | Kwete-chepfu, isinganakidze, isinganhuhwi | Kwete-chepfu, isinganakidze, isinganhuhwi | Kwete-chepfu, isinganakidze, isinganhuhwi |
| Density | 0.940 = 0.976g／cm3 | 0.910～0.940g/cm3 | 0.915～0.935g/cm3 |
| Crystalline | 85-65% | 45-65% | 55-65% |
| Molecular structure | Ine chete kabhoni-kabhoni uye kabhoni-hydrogen zvisungo, izvo zvinoda simba rakawanda kutyora | Mapolymers ane huremu hudiki hwemamorekuru uye anoda simba shoma kuti atyoke | Iyo ine mitsetse midiki yakarongeka, cheni dzine matavi, uye maketani mapfupi, uye inoda simba shoma kuti riputse. |
| softening point | 125-135 ° C | 90-100 ° C | 94-108 ° C |
| Mechanical maitiro | Simba rakakwirira, kusimba kwakanaka, kusimba kwakasimba | Simba remagetsi rakashata | Simba rakakwirira, kusimba kwakanaka, kusimba kwakasimba |
| Tensile Strength | yakakwirira | Low | yepamusorosoro |
| Elongation panguva yekuzorora | yepamusorosoro | Low | yakakwirira |
| Kubata simba | yepamusorosoro | Low | yakakwirira |
| Kusanyorova uye kusapinda kwemvura kuita | Kupinda zvakanaka kumvura, mhute yemvura nemhepo, kunyura kwemvura yakaderera, uye yakanaka anti-permeability. | Unyoro husina kunaka uye zvipingamupinyi zvemhepo | Kupinda zvakanaka kumvura, mhute yemvura nemhepo, kunyura kwemvura yakaderera, uye yakanaka anti-permeability. |
| Acid, alkali, corrosion, organic solvent resistance | Inopesana nekuora nemaoxidants akasimba; inopesana neasidhi, alkali uye zvakasiyana-siyana munyu; insoluble mune chero organic solvents, nezvimwe. | Inoshingirira kune asidhi, alkali uye munyu inogadzirisa ngura, asi isina kusimba yekunyungudutsa | Inopikisa kune acids, alkalis, uye organic solvents |
| Inodzivirira kupisa/kutonhora | Iyo ine yakanaka yekudzivirira kupisa uye kutonhora kuramba, kunyangwe pakamuri tembiricha uye kunyangwe pakudzika kwakadzika kwe -40F. Iyo ine yakanakisa kukanganisa kupikisa uye yayo yakaderera tembiricha embrittlement tembiricha iri | Kudzikira kwakadzika kurwisa, tembiricha yakaderera embrittlement tembiricha | Yakanaka kupisa kuramba uye kutonhora kuramba, yakaderera tembiricha embrittlement tembiricha |
| Kupokana nekupwanya kushushikana kwezvakatipoteredza | kugona | zviri nani | kugona |
High-density Polyethylene
HDPE haina muchetura, inoravira, haina kunhuwa, uye ine density ye0.940 ~ 0.976g/cm3, inova chigadzirwa chepolymerization pasi pekumanikidzwa kwemamiriro ezvinhu pasi pecatalysis yeZiegler catalyst, saka high-density polyethylene inozivikanwawo seyakaderera pressure. polyethylene.
Advantages:
HDPE isiri-polar thermoplastic resin ine high crystallinity inoumbwa ne ethylene copolymerization. Kutaridzika kweiyo HDPE yepakutanga ichena mukaka, uye inopenya kusvika kune imwe nhanho muchikamu chidiki. Iine kupikisa kwakanakisa kumakemikari mazhinji emumba uye emaindasitiri, uye inokwanisa kuramba kuparara uye kunyungudika kwemafuta akasimba (concentrated nitric acid), asidhi uye alkali munyu uye organic zvinonyungudutsa (carbon tetrachloride). Iyo polymer haitore unyoro uye ine yakanaka yekudzivirira mvura kumhepo, iyo inogona kushandiswa kunyorova uye kudzivirira seepage.
nezvayakaipira:
Izvo zvisingabatsiri ndezvokuti kuchembera kwekuchembera uye kuputika kwekunetseka kwezvakatipoteredza hazvina kunaka seLDPE, kunyanya iyo inopisa oxidation ichaderedza kushanda kwayo, saka yakakwirira-density polyethylene inowedzera antioxidants uye ultraviolet absorbers kuvandudza kukanganisa kwayo pakugadzira plastiki roll.
Yakadzika Density Polyethylene
LDPE haina chepfu, haina kunaka, haina hwema, uye ine density ye0.910 ~ 0.940g/cm3. Iyo yakagadzirwa neokisijeni kana organic peroxide sechinhu chinokonzeresa pasi pekumanikidzwa kwakanyanya kwe100 ~ 300MPa, inozivikanwawo seyakanyanya-kudzvanywa polyethylene.
Advantages:
Low density polyethylene ndiyo yakareruka mhando yepolyethylene resin. Zvichienzaniswa nepamusoro-density polyethylene, crystallinity yayo (55% -65%) uye softening poindi (90-100 ℃) yakaderera. Iyo ine yakanaka kupfava, kuwedzera, kujeka, kutonhora kuramba uye processability. Kugadzikana kwayo kwemakemikari kwakanaka, kunogona kumira asidhi, alkali uye munyu aqueous solution; Yakanaka magetsi ekudzivirira uye gasi permeability; Kutora mvura yakaderera; Nyore kupisa. Iyo midziyo yakapfava, ine yakanaka extensibility, magetsi ekuisa, kugadzikana kwekemikari, mashandiro ekugadzirisa uye kushomeka kwekushisa (kupikisa -70 ℃).
nezvayakaipira:
Izvo zvakashata ndezvekuti simba rayo remuchina, kuvharwa kwehunyoro, kuvharwa kwegasi uye kushomeka kwekunyungudika kwakashata. Iyo molecular chimiro haina kujairana zvakakwana, iyo crystallinity (55% -65%) yakaderera, uye iyo crystallization melting point (108-126 ℃) zvakare yakaderera. Simba rayo remagetsi rakaderera pane re-high-density polyethylene, iyo anti-seepage coefficient, kupisa kwekudzivirira uye kurwisa-kuchembera kushomeka, uye zviri nyore kuora uye kudzima pasi pezuva kana kupisa kwakanyanya, zvichikonzera kuderera kwekuita, saka yakaderera-density polyethylene inowedzera antioxidants uye ultraviolet absorbers kuvandudza kukanganisa kwayo pakugadzira mapepa epurasitiki.
Linear Low Density Polyethylene
LLDPE haina muchetura, haina kunaka, haina hwema, uye ine density iri pakati pe0.915 ne0.935g/cm3. Iyo copolymer ye ethylene uye shoma shoma yealpha-olefin yepamusoro (yakadai sebutene-1, hexene-1, octene-1, tetrmethylpentene-1, nezvimwewo) yakasvibiswa pasi pekumanikidzwa kwakanyanya kana kuderera kwepasi pasi pechiito che catalyst. . Iyo molecular chimiro cheyakajairwa LLDPE inoratidzwa neine mutsara musana, ine mashoma kana asina akareba cheni dzemapazi, asi iine mamwe mapfupi cheni dzemapazi. Kusavapo kwemaketani akareba ane matavi anoita kuti iyo polymer iwedzere kujeka.
Kuenzaniswa neLDPE, LLDPE ine zvakanakira kusimba kwepamusoro, kusimba kwakanaka, kusimba kwakasimba, kupisa kupisa, kutonhora kutonhora, nezvimwewo, asi zvakare ine kupikisa kwakanaka kwezvakatipoteredza kusagadzikana kutsemuka, kubvarura simba uye zvimwe zvinhu, uye inogona kuramba asidhi, alkali, organic solvents uye zvichingodaro.
Kusiyanisa nzira
LDPE: Sensory identification: nyoro kunzwa; Ichena yakajeka, asi pachena iri pakati nepakati. Kuzivikanwa kwekupisa: kupisa murazvo wero uye bhuruu; Paunenge uchipisa utsi, pane kunhuhwirira kweparafini, kunyunguduka kudonha, nyore kudhirowa waya.
LLDPE: LLDPE inogona kuzvimba ikasangana nebenzene kwenguva yakareba, uye kuita brittle kusangana neHCL kwenguva yakareba.
HDPE: Iyo tembiricha yekugadzirisa yeLDPE yakaderera, inenge 160 madhigirii, uye density iri 0.918 kusvika 0.932 gramu/cubic centimita. HDPE yekugadzirisa tembiricha yakakwira, ingangoita 180 madhigirii, iyo density zvakare yakakwira.
pfupiso
Muchidimbu, mhando nhatu dzepamusoro dzezvishandiso dzinotamba mabasa adzo akakosha mumhando dzakasiyana dzeinjiniya yekudzivirira. HDPE, LDPE uye LLDPE matatu marudzi ezvishandiso ane yakanaka insulation uye hunyoro-humbowo, kusapinda, kusiri muchetura, kusaravira, kusanhuhwirira kuita kunoita mukurima, aquaculture, madziva ekugadzira, madhamu, nzizi kunyorera kwakawedzera zvakanyanya, uye neBazi. yeKurima kweChina Fisheries Bureau, Shanghai Academy yeFisheries Sayenzi, iyo Institute of fishery machines uye zviridzwa zvekusimudzira uye kupambira mashandisirwo.
Munzvimbo yepakati yeasidhi yakasimba, alkalis yakasimba, maoxidants akasimba uye organic solvents, zvinhu zveHDPE neLLDPE zvinogona kuridzwa zvakanaka uye kushandiswa, kunyanya HDPE yakakwirira kwazvo kupfuura zvimwe zvinhu zviviri maererano nekupokana kune yakasimba asidhi, yakasimba. alkalis, yakasimba oxidation zvivakwa uye kuramba kune organic solvents. Naizvozvo, HDPE anti-corrosion coil yakashandiswa zvizere muindasitiri yemakemikari uye indasitiri yekudzivirira kwezvakatipoteredza.
LDPE inewo yakanaka asidhi, alkali, munyu mhinduro maitiro, uye ine extensibility yakanaka, magetsi ekudzivirira, kugadzikana kwekemikari, kugadzirwa kwekuita uye kushomeka kwekushisa, saka inoshandiswa zvakanyanya mukurima, kuchengetedza mvura aquaculture, kurongedza, kunyanya yakaderera-tembiricha kurongedza uye. cable zvinhu.
