A VI-jav\u00edt\u00f3k (VI = viszkozit\u00e1si index) haszn\u00e1lata lehet\u0151v\u00e9 teszi a t\u00f6bbfokozat\u00fa motorolajok el\u0151\u00e1ll\u00edt\u00e1s\u00e1t. A VI-jav\u00edt\u00f3k n\u00f6velik vagy ny\u00fajtj\u00e1k az olaj viszkozit\u00e1s\u00e1t, \u00e9s \u00edgy jav\u00edtj\u00e1k a viszkozit\u00e1s-h\u0151m\u00e9rs\u00e9klet viselked\u00e9st. K\u00e9pletesen sz\u00f3lva, ezek nagyon hossz\u00fa, sz\u00e1las molekul\u00e1k, amelyek hideg \u00e1llapotban az olajban vannak, \u00e9s g\u00f6mb\u00f6t alkotnak, viszonylag kis ellen\u00e1ll\u00e1st ny\u00fajtva az olajmolekul\u00e1k mozg\u00e1s\u00e1nak. A h\u0151m\u00e9rs\u00e9klet emelked\u00e9s\u00e9vel kibomlanak, nagyobb t\u00e9rfogatot vesznek fel, \u00e9s egy olyan h\u00e1l\u00f3t alkotnak, amely lass\u00edtja az olajmolekul\u00e1k mozg\u00e1s\u00e1t, \u00e9s k\u00e9slelteti az olaj t\u00fal gyors \"elv\u00e9konyod\u00e1s\u00e1t\".<\/p>\n
VI-jav\u00edt\u00f3k \/ ny\u00edr\u00e1s: A VI-jav\u00edt\u00f3k terhel\u00e9s hat\u00e1s\u00e1ra ny\u00edrhat\u00f3k, azaz a hossz\u00fa molekul\u00e1k sz\u00f3 szerint sz\u00e9tszakadnak. Ez viszkozit\u00e1sveszt\u00e9ssel j\u00e1r. A viszkozit\u00e1sveszt\u00e9s visszaford\u00edthatatlan, \u00e9s ezt \u00e1lland\u00f3 ny\u00edr\u00e1snak nevezik. A sz\u00e9tszakadt molekul\u00e1k kisebb t\u00e9rfogatot foglalnak el, \u00e9s ez\u00e9rt kisebb a s\u0171r\u00edt\u0151 hat\u00e1suk. A ken\u0151anyag ny\u00edr\u00e1si stabilit\u00e1s\u00e1t alapvet\u0151en a VI jav\u00edt\u00f3szer min\u0151s\u00e9ge hat\u00e1rozza meg. Nagy ny\u00edr\u00f3terhel\u00e9s van jelen p\u00e9ld\u00e1ul a dugatty\u00fagy\u0171r\u0171k ter\u00fclet\u00e9n (magas forg\u00e1si sebess\u00e9gek, cs\u00fasz\u00e1si sebess\u00e9gek, nyom\u00e1s \u00e9s h\u0151m\u00e9rs\u00e9klet).<\/p>\n
\u00a0<\/p>","protected":false},"excerpt":{"rendered":"
Der Einsatz von VI-Verbesserern (VI = Viskosit\u00e4tsindex) erm\u00f6glicht die Herstellung von Mehrbereichs-Motoren\u00f6len. VI-Verbesserer erh\u00f6hen bzw. strecken die Viskosit\u00e4t eines \u00d6les und verbessern somit das Viskosit\u00e4ts-Temperatur-Verhalten. Sie sind bildlich gesprochen sehr lange, faserf\u00f6rmige Molek\u00fcle, die im kalten Zustand zusammengekn\u00e4ult im \u00d6l vorliegen und hier der Bewegung der \u00d6lmolek\u00fcle einen relativ geringen Widerstand entgegensetzten. Mit zunehmender Temperatur\u2026<\/p>","protected":false},"author":137,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-286","post","type-post","status-publish","format-standard","hentry","category-oel-lexikon","category-108","description-off"],"_links":{"self":[{"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/posts\/286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/users\/137"}],"replies":[{"embeddable":true,"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/comments?post=286"}],"version-history":[{"count":1,"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/posts\/286\/revisions"}],"predecessor-version":[{"id":21591,"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/posts\/286\/revisions\/21591"}],"wp:attachment":[{"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/media?parent=286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/categories?post=286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mathy-austria.com\/hu\/wp-json\/wp\/v2\/tags?post=286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}