POM yas, tseem hu ua polyoxymethylene los yog polyoxyethylene aldehyde, yog cov yas zoo engineering. Nws yog tsim los ntawm formaldehyde thiab formaldehyde polymers thiab muaj lub cev zoo thiab tshuaj lom neeg.
Qhov zoo tshaj plaws ntawm POM yas yog nws hardness thiab hnav tsis kam, uas muaj zog dua lwm cov ntaub ntawv yas. Tsis tas li ntawd, POM yas muaj qhov zoo ntawm cov tshuaj tiv thaiv corrosion, kub tsis kam, roj tsis kam, hnyav tsis kam, rwb thaiv tsev zoo, thiab tsis tshua muaj dej nqus.
POM yas muaj ntau yam kev siv, xws li cov cuab yeej hluav taws xob, kev lag luam tsheb, textile machinery, shoemaking machinery, sanitary khoom, thiab lwm yam. roj hmab springs, thiab lwm yam. Tsis tas li ntawd, POM yas kuj tseem siv tau los ua cov khoom siv rooj tog, khoom siv niaj hnub, cov khoom dai, thiab lwm yam.
Nyob rau hauv cov nqe lus ntawm daim ntawv thov, POM yas yog dav siv nyob rau hauv lub tsheb kev lag luam los tsim me me qhov chaw ntawm lub tsheb, xws li micro keyboards, roj injectors, roj injector fixings, roj twj tso kua mis qhov chaw, thiab lwm yam nyob rau hauv kev tsim cov cuab yeej, POM cov ntaub ntawv yuav siv tau los tsim. high-density iav thiab lwm qhov chaw rau cov tshuab loj. Tsis tas li ntawd, POM yas kuj tau siv dav hauv kev tsim cov khoom siv hauv tsev, xws li tshuab ntxhua khaub ncaws, tshuab ziab khaub ncaws, tshuab ntxhua khaub ncaws, thiab lwm yam.
POM yog 100% recyclable. Nws tseem hu ua polyformaldehyde, polymethylene glycol, thiab polyoxymethylene glycol.
Yuav ua li cas polyoxymethylene tsim nyob rau hauv lub xyoo?
Cov ntsiab lus tseem ceeb ua tiav hauv kev txhim kho POM yog:Kev Tshawb Fawb ntawm Formaldehyde Polymers: Thawj synthesized thiab kawm nyob rau hauv thaum ntxov 20th caug xyoo. Cov polymers no suav nrog acetal polymers. Cov kws tshawb nrhiav pom tias formaldehyde tuaj yeem ua polymerize rau cov khoom siv nrog cov khoom tsim nyog.
Development of POM: Xyoo 1920, Hermann Staudinger, tus kws tshuaj German tau tshawb pom Polyoxymethylene. Nws tau tshawb fawb ntau yam ntawm polymers thiab lub tswv yim ntawm macromolecules. Nws txoj haujlwm tau tsim lub hauv paus rau kev txhim kho polyacetal polymers. Tom qab ntawd nws tau txais Nobel nqi zog hauv Chemistry hauv xyoo 1953.
Kev lag luam hauv xyoo 1956: DuPont tau los ua thawj lub tuam txhab tsim POM homopolymer. Lawv tau qhia ib txoj hauv kev raws li formaldehyde polymerization siv cov kev sib koom ua ke catalyst.
Kev lag luam hauv xyoo 1962: Celanese tau los ua thawj lub tuam txhab tsim POM copolymer. Lawv siv cov txheej txheem acid-catalyzed los tsim cov copolymer no.
Yuav ua li cas los sib piv ntawm POM homopolymer los yog copolymer?
Acetal homopolymer muajyog tsim los ntawm anhydrous, monomeric formaldehyde uas yog polymerized los ntawm anionic catalysis nyob rau hauv ib tug organic kua tshuaj tiv thaiv nruab nrab. Lub resulting polymer yog stabilized los ntawm cov tshuaj tiv thaiv rau acetic anhydride.Thaum, lubPOM copolymerYuav tsum tau hloov pauv ntawm formaldehyde rau hauv trioxane siv cov kua qaub catalysis thiab cationic polymerization. Cov tshuaj tiv thaiv yog ua raws li kev ua kom huv ntawm trioxane los ntawm distillation lossis extraction kom tshem tawm cov dej thiab lwm yam khoom tsis huv uas muaj hydrogen.
| Acetal Copolymer | Acetal Homopolymer |
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Yooj yim rau txheej txheem / dav ua qhov rai Kev ua tau zoo tshaj plaws rau lub sijhawm ntev (kev ua haujlwm tsis zoo, qaug zog, ua siab ntev, tuav lub zog) Tsawg gassing thiab tsw Hnyav hlau tsis muaj xim, piv txwv li cadmium thiab txhuas (zoo dua rau cov neeg ua haujlwm / ib puag ncig) Kev tu kom zoo dua ntawm cov xim Nyob rau hauv lub teeb raug ultraviolet Lub voj voog molding sai dua Tsawg pwm deposits Ruaj khov nyob rau hauv alkaline ib puag ncig |
Muaj nyob rau hauv ntau yam viscosity Ntau qib ntawm kev tsis tu ncua hauv lawv cov qauv Siab zog tensile Unfilled homopolymer yog nruj thiab muaj zog Nruab nrab toughness nyob rau hauv rov qab cuam tshuam Tso cai rau nyias thiab sib dua ib feem tsim Shorter molding cycles Muaj peev xwm txo tus nqi Muab cov khoom siv zoo dua qub |
