Xaiv Txoj Cai Polyurethane Seal: Polyether Vs. Polyester Rau Hydraulic Thiab Pneumatic Daim Ntawv Thov
May 08, 2026
Hauv cov ntsiab lus yooj yim, thaum siv cov nplhaib sib khi, cov txiaj ntsig tseem ceeb ntawm polyether-raws li polyurethane dag nyob rau hauv nws cov hydrolysis tsis kam thiab tsis tshua muaj kev sib txhuam, ua rau lub neej ua haujlwm ntev. Nyob rau hauv sib piv, thaum zoo tib yam polyester-raws li polyurethane muaj lub zog siab thiab zoo roj kuj, nws yog feem ntau ua rau hydrolysis tsis ua hauj lwm nyob rau hauv ib puag ncig ntub.
Ob leeg cov ntaub ntawv muaj nyob rau hauv tsev neeg polyurethane thiab pom zoo hnav tsis kam thiab siab zog, tab sis muaj qhov sib txawv tseem ceeb hauv lawv cov khoom tshwj xeeb. Cov hauv qab no yog cov ncauj lus kom ntxaws sib piv ntawm polytetramethylene ether glycol (PTMEG, ib hom polyether) thiab polyester zoo tib yam -raws li polyurethane rau sealing nplhaib:
1. Hom Polyether (sawv cev los ntawm PTMEG) - Qhov zoo thiab qhov tsis zoo
Qhov zoo:
Zoo heev hydrolysis tsis kam:Qhov no yog qhov tseem ceeb tshaj qhov sib txawv ntawm polyester hom. Polyether yog inert rau dej molecules, tswj kev ua haujlwm ruaj khov hauv cov av noo, dej - raug, lossis ib puag ncig aqueous yam tsis muaj hydrolysis. Nws lub neej cia thiab kev pabcuam tuaj yeem ncav cuag li 20 xyoo, nyob ruaj khov txawm tias nyob rau hauv qhov kub thiab av noo ntawm 55 degree.
Tsis tshua muaj kev sib txhuam coefficient:Kev sib txhuam coefficient ntawm polyether polyurethane tuaj yeem qis li 0.18-0.30, txog ib -peb peb ntawm cov polyurethane zoo tib yam (kwv yees . 0.8), thiab qis dua li ntawm nitrile roj hmab (1.3-1.5). Qhov no txhais tau hais tias kev ua haujlwm qis dua, tsim hluav taws xob tsawg dua, thiab txo qis hnav.
Ultra- lub neej ua haujlwm ntev:Ua tsaug rau kev sib txhuam qis thiab hydrolysis tsis kam, nws lub neej kev pabcuam yog li tsib npaug ntawm cov khoom siv hauv tsev, nrog kev hnav tsuas yog ib qho - yim feem ntawm nitrile roj hmab.
Muaj zog extrusion tsis kam:Nrog rau ntau dua modulus, qhov siab tshaj plaws pub extrusion qhov sib txawv yog 0.76 hli, ntau tshaj plaub npaug ntawm cov roj hmab nitrile, tso cai rau kev hloov zoo dua rau hnav lub tog raj kheej bores.
Zoo qis -kub kev ua haujlwm:Kev sib hloov dawb ntawm ether bonds tso cai rau nws kom muaj kev ywj pheej zoo txawm tias nyob hauv qhov chaw txias heev li qis li -40 degree.
Qhov tsis zoo:
Tsawg zog mechanical zog:Txawm hais tias muaj zog dua li roj hmab, nws lub zog tensile thiab lub zog tsim kua muag qis dua me ntsis piv rau polyester-raws li polyurethane.
Me ntsis inferior roj kuj:Thaum nws muaj peev xwm ua tau zoo rau cov roj ntxhia, qee cov roj lubricating yuav tsum muaj cov ntsiab lus siab dua (piv txwv li, cov roj uas muaj cov ntsiab lus siab aniline).
2. Hom Polyester (Cov Hom Zoo Ib Leeg) - Qhov zoo thiab qhov tsis zoo
Qhov zoo:
High mechanical zog:Ntawm tag nrho cov khoom siv roj hmab, nws lub zog tensile thiab lub zog tsim kua muag yog qhov siab tshaj plaws, muab lub cev zoo heev.
Zoo heev roj thiab hnyav kuj:Nws muaj kev ua siab ntev rau cov roj ntxhia, roj hydraulic, roj roj, thiab lwm yam, thiab tsis tshua muaj kev tawm tsam, piv rau nitrile roj hmab.
Qhov tsis zoo:
Tsis zoo hydrolysis tsis kam (Achilles 'heel):Ester pab pawg muaj kev cuam tshuam los ntawm cov dej molecules, ua rau hydrolysis sai hauv qhov chaw kub thiab av noo ntawm 55 degree. Qhov no ua rau tawg, hmoov, thiab poob qis hauv kev ua haujlwm. Qhov no yog lub ntsiab yog vim li cas nws yog unsuitable rau sealing rings nyob rau hauv ib puag ncig ntub.
Summary and Selection Guide
| Cov khoom sib piv | Hom Polyether (PTMEG) | Hom polyester |
|---|---|---|
| Hydrolysis Resistance | Zoo heev | Tsis zoo (yuav ua rau tsis ua hauj lwm hauv qhov kub / av noo) |
| Kev sib txhuam coefficient | Tsawg heev (0.18–0.3) | Zoo heev (kwv yees . 0.5–0.8) |
| Mechanical Strength | Siab | Siab dua (theoretically muaj zog) |
| Roj kuj | Zoo heev | Zoo heev |
| Tsawg-Tsub Toughness | Zoo heev (mus txog -40 degree) | Zoo |
| Core Zoo | Lub neej ntev, noo noo tsis kam, hnav tsis kam | Siab kawg lub zog, tus nqi qis |
Yuav xaiv li cas?
Xaiv hom polyether (thawj xaiv):Yog tias lub nplhaib sib khi yog siv rau hauv kev txhawb nqa hydraulic, cov khoom siv sab nraum zoov, cov twj tso kua dej, qhov chaw ntub dej, lossis cov ntawv thov kev sib cuag nrog dej, nrog rau cov xwm txheej xav tau lub neej ntev thiab kev sib txhuam tsawg. Txawm hais tias tus nqi tsev yuav siab dua, tag nrho cov nqi ntawm lub neej yog qis dua.
Xav txog hom polyester:Yog tias lub nplhaib sib khi ua haujlwm tsuas yog nyob rau hauv qhuav, tsis muaj dej, roj zoo li qub- qhov chaw sib khi, thiab muaj qhov tshwj xeeb yuav tsum tau ua kom lub zog tsim kua muag kawg nkaus, thaum lub peev nyiaj tsawg heev.
Yog tias koj txaus siab, thov koj xav tiv tauj peb ntawm email kom paub ntau ntxiv.
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