Ntxiv silicas nyhav kom viscosity nrawm dua li lwm qhov muab tub lim.

Ntxiv silicas nyhav kom viscosity nrawm dua li lwm qhov muab tub lim.
Qhov no yog qhov tshwj xeeb nrog thaj chaw siab (me me cov qhov me me-nyuaj) silicas
Lub tshuab siv nrawm siv feem ntau cuam tshuam los ntawm silicas
ob qho tib si kho mob zoo tshaj plaws thiab tus nqi kho tau txo qis
Thaum ntxov ntxiv ntawm zinc oxide thiab silica ua rau Mooney Viscosity qis dua, ntau dua kev tuag hloov pauv thiab qis dua cov qauv.
Kev txiav cov zinc oxide kom txog thaum lub silica tawg, ua rau kom muaj viscosity.
Qee cov neeg siv tshuab siv nrog cov roj hmab silica puv txo viscosity zoo
Diethylene glycol (DEG) thiab Triethanolamine (TEA) ntawm 2 phr tuaj yeem txo viscosity los ntawm 30%
Polyethylene glycol (PEG) tsuas yog ib nrab ntawm kev ua haujlwm
Viscosity kuj tseem tuaj yeem txo qis los ntawm kev siv cov txheej txheem roj hydrocarbon
Hauv Cov Roj Hmab Ntuj nrog Silicas, Plasticizers ntawm cov hauv paus chiv keeb muaj cov yam ntxwv tshwj xeeb, 5 phr ntawm Cov Roj Pob yog li ntawm 30 phr ntawm napthenic roj.
Hauv SBR, cov ntxhiab tsw muaj ntxig muaj qhov zoo nrog silica sau.
Coumarone-indene resins pab hauv kev koom ua ke tus nqi thiab kev kis
Tensile, kua muag, abrasion thiab extrusion smoothness yog superior nrog 10-20 phr uas muaj ntxhiab zoo nkauj raws li cov txheej txheem roj
Kho Cov Tshuab
Cov nplaim hluavtaws saum npoo ntawm precipitated silicas sib txawv sib txawv ntawm lwm qhov chaw ntim. Qhov no ua rau muaj kev sib txawv ntawm cov khoom sib txawv. Kev kho cov xim pob zeb uas muaj txheej txheem uas muaj cov nag lossis daus silica yuav tsum tau hloov kho kom tau txais qhov ua tau zoo tshaj plaws.
Nrog cov zoo me me silicas saum toj no txog 20phr, diethylene glycol (DEG) los yog polyethylene glycol (DEG) txo cov tseev nrawm dua. Lub glycols tseem tsis tus kuj tsis paub meej noo noo thiab yog ib qho kev lag luam kom zoo dua.
Kev Siv Vulcanization Kom Ua Tau Zoo (EV) cia siab rau leej faj los yog cov tsuj roj nrog cov leej faj thiab tsis tshua muaj cov leej faj.
Cov lus qhia dav dav:
Sib txuas ob lossis ntau dua cov tshuaj nrawm nrawm, ib qho los ntawm thiazoles lossis sulfonamides, qhov thib ob los ntawm guanidines, thiurams, lossis dithiocarbamates
Ntxiv glycol activators (TEA, DEG, PEG) kom txo qis cov ntawv thov ceev thiab tsis tuaj yeem ua kom tsis txhob noo noo
Sulphur Donor (EV) cov tshuab ua kom muaj kev sib txuam zoo, muaj cov cuab yeej tsim kho kom zoo dua qub thiab muaj cua sov
Vulcanazite Cov Khoom Tseem Ceeb - xav tias yog lub xeev zoo ntawm kev kho
tsawg modulus piv rau carbon xim dub hauv qhov me me hauv qhov loj me
Tensile lub zog zoo ib yam li saum toj no
Siab dua elongation thaum tawg thiab qis tsis kam mus rau abrasion
Kev Tawm Tsam Tsis Ntau Ntxiv nrog thaj tsam thaj chaw
High Tear zoo heev nrog silica thiab nws nce nrog nce thaj tsam thaj chaw
Cov roj hmab uas muaj cov kua roj me me tawm ntawm cov kua muag hauv qhov tsis pom “hniav-hniav” cov txheej txheem feem ntau hu ua ‘knotty tear’.
Tseem ceeb tshaj plaws uas kev kho mob zoo tshaj plaws tau mus txog
Qhov kev ua kom zoo dua qub ntxiv nrog kev sib txuam
mercaptopropyltrimethoxysilane sis qhov zoo tshaj
ua kom muaj kev sib txuam muaj zog ntawm silica thiab roj hmab, uas ua rau muaj ntau ntxiv hauv qhov cuab lub zog
Nrog silanes, nws yog ib qho tseem ceeb uas yuav tsum tso cai kom cov silica, roj hmab thiab silane sib tov kom huv ua ntej ntxiv lwm cov khoom xyaw
Nws yog qhov tshwj xeeb tshaj yog tsis muaj zinc oxide nyob rau lub sijhawm no
Theej, ntxiv cov zinc oxide lig nyob rau qib 1 lossis qib 2 kom tsis txhob muaj kev cuam tshuam nrog kev coj ua
Tsuas yog cov khoom xyaw tsim nyog rau kev tsim khoom lag luam (cov yas ntim khoom) yuav tsum muaj thaum lub sijhawm sib xyaw ua ntej
Silicone-Roj Hmab Tshaj Sib
Peb hom silica siv:
Fumed - qhov siab tshaj plaws thiab zoo tshaj plaws hluav taws xob
Precipitated - muaj txiaj ntsig zoo tensile lub zog, tsim kua muag zog, thiab dej nqus thiab cov khoom hluav taws xob nyob ntawm tus nqi nruab nrab.
Cov qib tshwj xeeb muaj cov khoom hluav taws xob zoo dua thiab txo qhov nqus dej
Dej Ntim tau o tuaj tom qab 24 teev yog 1-2% nrog fumed thiab 5-10% nrog nag lossis daus