Kev paub txog cov ntaub ntawv sealing rau solenoid li qub

Tam sim no, muaj peb feem ntau siv sealing cov ntaub ntawv rau solenoid li qub. Nov yog ib qho kev taw qhia:

I. NBR (NR butadiene roj hmab)

Tau txais los ntawm emulsion polymerization ntawm butadiene thiab acrylonitrile, acrylonitrile butadiene roj hmab yog tsim los ntawm qhov kub thiab txias emulsion polymerization. Nws muaj cov roj ua haujlwm zoo, siab hnav tsis kam, zoo tshav kub ua haujlwm thiab muaj zog adhesion. Nws qhov tsis zoo yog qhov kub thiab txias tsis kam, tsis zoo ozone kuj, hluav taws xob tsis zoo thiab tsis muaj elasticity.

Tsis tas li ntawd, nws kuj muaj dej tsis kam, huab cua nruj thiab kev sib raug zoo zoo. Nws yog dav siv nyob rau hauv kev tsim khoom ntawm ntau yam roj-resistant roj hmab cov khoom, ntau yam roj-resistant washers, gaskets, casings, saj zawg zog ntim, saj zawg zog raj raj, luam ntawv thiab dyeing roj hmab rollers, cable roj hmab cov ntaub ntawv, thiab lwm yam. nws tau dhau los ua ib qho tseem ceeb elastic. cov khoom siv hauv tsheb, aviation, roj av, luam ntawv thiab lwm yam lag luam.

NBR muaj cov roj ua haujlwm zoo heev, uas yog qhov thib ob tsuas yog cov roj hmab polysulfide thiab fluororubber, thiab hnav tsis kam thiab huab cua nruj. Qhov tsis zoo ntawm NBR yog tias nws tsis tiv taus ozone thiab aromatic, halogenated hydrocarbon, ketone thiab ester cov kuab tshuaj, yog li nws tsis haum rau cov ntaub ntawv insulating.

Kev siv tseem ceeb: NBR feem ntau yog siv los ua cov khoom siv roj, xws li roj yeeb nkab, daim kab xev, roj hmab diaphragm thiab lub hnab roj loj. Nws yog feem ntau siv los ua ntau yam roj resistant molded cov khoom, xws li O-ring, roj foob, tawv tais, diaphragm, valve, bellows, thiab lwm yam., thiab kuj ua rau roj hmab phaj thiab hnav-resistant qhov chaw.

II. EPDM ethylene propylene diene monomer

EPDM yog terpolymer ntawm ethylene, propylene thiab tsis conjugated diene. Nws pib ua lag luam ntau lawm hauv xyoo 1963. Kev noj txhua xyoo ntawm lub ntiaj teb yog 800000 tons. Cov yam ntxwv tseem ceeb tshaj plaws ntawm EPDM yog nws lub peev xwm zoo tshaj plaws los tiv thaiv oxidation, ozone thiab yaig. Vim tias EPDM belongs rau tsev neeg polyolefin, nws muaj vulcanization zoo heev. EPDM muaj qhov sib nqus tshwj xeeb tshaj plaws ntawm tag nrho cov roj hmab. Nws tuaj yeem nqus tau ntau ntawm cov fillers thiab roj, tab sis tsis tshua muaj txiaj ntsig rau nws cov khoom. Yog li ntawd, cov khoom siv roj hmab nrog cov nqi qis tuaj yeem ua tau.

Molecular qauv thiab cov khoom

Structure: EPDM yog terpolymer ntawm ethylene, propylene thiab tsis conjugated diene. Diene muaj cov qauv tshwj xeeb, tsuas yog ib qho ntawm ob daim ntawv cog lus tuaj yeem ua tau copolymerized, ob daim ntawv cog lus unsaturated feem ntau yog siv los ua cov saw hlau. Lwm yam unsaturated yuav tsis yog cov saw tseem ceeb ntawm polymer, tab sis sab saw. Lub ntsiab polymer saw ntawm EPDM yog tag nrho saturated. Cov cuab yeej no ua rau EPDM tiv taus cua sov, lub teeb, oxygen, tshwj xeeb tshaj yog ozone. EPDM yog qhov tseem ceeb tsis muaj polar, tiv taus cov ntsiab lus polar thiab tshuaj, nrog rau cov dej tsis zoo thiab cov khoom siv rwb thaiv tsev zoo.

Nta: 1. Cov khoom siv hluav taws xob; 2. elasticity; 3. Adhesion; 4. Tsawg ceev thiab siab filling; 5. Cov dej kub tsis kam; 6. Dej vapor tsis kam; 7. Kev laus tsis kam; 8. Corrosion kuj.

III. Viton fluororubber (FKM)

Muaj ntau hom roj hmab uas muaj fluorine raws li cov ntsiab lus fluorine lossis monomer qauv. Tam sim no, dav siv fluororubber ntawm hexafluoride series yog thawj zaug teev los ntawm DuPont lub tuam txhab nyob rau hauv lub lag luam lub npe ntawm "Viton" Kub kub kuj yog zoo dua li silicone roj hmab tshuaj tiv thaiv, tsis kam mus rau feem ntau cov roj thiab cov kuab tshuaj (tshwj tsis yog ketones thiab esters), huab cua tsis zoo. thiab ozone tsis kam, tab sis tsis txias tsis kam; Feem ntau dav siv nyob rau hauv chav turbine tsheb, B thiab lwm yam khoom, tshuaj nroj tsuag ntsaws ruaj ruaj, siv kub ntau yam - 20 degree ~ 260 degree, tsis tshua muaj kub resistant hom yuav siv tau rau - 40 degree, tab sis tus nqi yog siab. .