Kev sib xyaw ntawm cov roj hmab yog disperse ntau lub tebchaw sib npaug hauv cov roj hmab nrog kev pab ntawm cov neeg kho tshuab quab yuam ntawm cov roj hmab ua tshuab, thiaj li tsim tau ntau theem colloidal dispersion system nrog roj hmab li nruab nrab lossis sib xyaw ntawm cov roj hmab thiab qee cov khoom sib xws (tus neeg sawv cev sib tw, lwm yam polymers) raws li qhov nruab nrab, thiab cov neeg ua haujlwm tsis sib xws (xws li hmoov fillers, zinc oxide, pigments, thiab lwm yam). txheej txheem. Cov kev cai tshwj xeeb ntawm cov txheej txheem kev sib xyaw ua ke yog: kev sib xyaw ua ke ntawm tus neeg sawv cev sib xyaw ua ke, kom qhov zoo tshaj plaws dispersion ntawm tus neeg sawv cev compounding, tshwj xeeb tshaj yog cov khoom siv ntxiv xws li carbon dub, tau ua tiav los xyuas kom muaj kev ua tau zoo ntawm cov roj hmab. Cov roj hmab uas tshwm sim yog hu ua 'compounding rubber' thiab nws qhov zoo muaj qhov tseem ceeb ntawm kev ua haujlwm ntxiv thiab cov khoom zoo.
1 - Kev sib xyaw ntawm neoprene
Neoprene yog emulsion polymerization txoj kev ntawm ntau lawm, cov txheej txheem ntau lawm feem ntau yog ib qho kev sib tshuam polymerization. Polymerization kub feem ntau yog tswj ntawm 40-60 ℃, thiab hloov pauv tus nqi yog li 90%. Polymerization kub, qhov kawg hloov pauv tus nqi siab dhau lawm lossis cov txheej txheem polymerization rau hauv huab cua yuav ua rau cov khoom tsis zoo. Tus txheeb ze molecular loj yog tswj los ntawm sulfur-kiuram (tetraalkylmethylaminothiocarbonyldisulfide) system hauv kev tsim khoom. Lub ntsiab tsis zoo ntawm cov sulfur-kiuram system yog qhov tsis muaj kev ruaj ntseg ntawm cov sulfur bonds, uas yog ib qho ntawm cov laj thawj tseem ceeb rau cov khoom khaws cia. Yog tias qhov txheeb ze molecular loj raug kho nrog thiol tuaj yeem txhim kho qhov kev ua tau zoo. Neoprene yog qhov sib txawv ntawm cov roj hmab hluavtaws dav dav, nws tsis siv sulfur vulcanization, tab sis nrog zinc oxide, magnesium oxide, thiab lwm yam vulcanization.
Kev ua haujlwm ntawm neoprene nyob ntawm tus cwj pwm viscoelastic ntawm unvulcanized roj hmab, thiab nws tus cwj pwm viscoelastic muaj feem xyuam rau ntau yam ntawm neoprene thiab kub. Raws li kev sib xyaw ua ke feem ntau tau ua nyob rau hauv lub xeev elastic kom siv lub zog shear ntawm lub xeev elastic ntawm cov roj hmab kom cov muab tub lim zoo dispersed. Yog li ntawd, kom tsis txhob muaj qhov kub thiab txias thaum sib tov neoprene, cov muab tub lim yuav tsum tau ntxiv kom ntxov li sai tau thiaj li ua tiav qee qhov kev sib xyaw hauv lub xeev elastic. Thaum sib tov nrog qhib refiner, G-hom neoprene rhiab heev rau qhov kub thiab txias hloov, thiab yob kub ntau tshaj 70 ℃, nws yuav nplaum nplaum nplaum, thiab nyob rau hauv lub viscous flow xeev, thiab cov muab tub lim tsis yooj yim rau disperse. When mixing with a dense refiner, its capacity should be appropriately reduced, the general filling factor of 0.6 is appropriate, generally divided into two mixing, in order to minimize the mixing temperature. Qhov ntsuas kub tawm yuav tsum qis dua 100 ℃.
Neoprene hauv kev siv lub tshuab qhib qhov sib xyaw qhov tsis zoo yog qhov kub yog qhov loj, yooj yim rau lo rau cov chais, yooj yim rau scorch, nrog tus neeg sawv cev dispersion qeeb, yog li qhov sib tov kub yuav tsum tsis txhob siab dhau, lub peev xwm yuav tsum me me, qhov sib piv ntawm cov menyuam yuav tsum tsis txhob loj. Vim yog qhov muaj zog rhiab heev rau qhov kub thiab txias, lub hom phiaj dav dav ntawm neoprene ntawm chav tsev kub txog 71 ℃, nws yuav qhia lub xeev cov nplej, lub sijhawm no kev sib koom ua ke ntawm cov roj hmab nyoos tsis muaj zog, tsis tsuas yog cov nplaum nplaum loj, nrog rau tus neeg sawv cev dispersion kuj yuav nyuaj heev. Lub xeev elasticity ntawm non-sulfur-regulated neoprene yog qis dua 79 ℃, yog li cov txheej txheem sib xyaw ua haujlwm zoo dua li cov tshuaj sulfur-regulated, thiab cov nyiam ntawm cov nplaum nplaum thiab scorching yog me dua. Kneading nrog lub tshuab qhib, txhawm rau kom tsis txhob muaj cov nplaum nplaum, cov yob kub feem ntau tswj tau ntawm 40 ~ 50 ℃ lossis tsawg dua (cov yob pem hauv ntej yog 5 ~ 10 ℃ qis dua qhov kub ntawm lub nraub qaum), thiab hauv cov roj hmab nyoos kneading, yob nrug yuav tsum tau maj mam kho los ntawm qhov loj mus rau me me. Thaum sib tov, thawj zaug ntxiv acid absorbent magnesium oxide los tiv thaiv scorching, thiab thaum kawg ntxiv zinc oxide. Txhawm rau txo cov cua sov sib xyaw, cov pa roj carbon dub thiab cov kua muag muag tuaj yeem muab ntxiv rau hauv cov khoom sib hloov. Stearic acid thiab paraffin wax thiab lwm yam kev pabcuam kev ua haujlwm tuaj yeem sib cais maj mam ntxiv, txhawm rau pab kom tawg, tab sis kuj tiv thaiv cov nplaum nplaum. Sulfur-regulated chloroprene roj hmab nyob rau hauv lub opener mixing lub sij hawm yog feem ntau 30% mus rau 50% ntev tshaj li cov roj hmab ntuj, uas tsis yog-sulfur-regulated sib tov lub sij hawm yuav ua tau li 20% luv dua sulfur-regulated. Txhawm rau kom tsis txhob muaj neoprene hauv lub tshuab sib xyaw hauv qhov qhib qhov kub thiab txias, qhov sib piv ceev yog tsawg dua 1: 1.2 hauv qab no, cov nyhuv txias yuav zoo dua. Txo lub peev xwm refining kuj yog ib txoj hauv kev ua kom muaj kev nyab xeeb ntawm kev ua haujlwm thiab kev ua kom zoo. Tam sim no, cov khoom siv hluav taws xob hauv tsev tswj hwm neoprene roj hmab refining muaj peev xwm tshaj li cov roj hmab ntuj yuav tsum tsawg dua 20% mus rau 30%, thiaj li ua haujlwm tau zoo. Raws li neoprene yog ib qho yooj yim rau scorch, yog li nyob rau hauv kev siv cov ntom refining tshuab nws feem ntau yog siv nyob rau hauv ob txoj kev sib tov. Qhov sib tov kub yuav tsum qis dua (qhov ntsuas kub feem ntau tswj tau qis dua 100 ℃), lub peev xwm thauj khoom qis dua li ntawm cov roj hmab ntuj (qhov muaj peev xwm feem ntau yog 0.50 ~ 0.55), thiab zinc oxide ntxiv rau cov xovxwm hauv qhov sib xyaw thib ob. Rau qhov teeb meem uas chloroprene roj hmab sib tov yog yooj yim rau scorch thiab nyuaj rau disperse, Leena refiner txais lub siab tshaj plaws plaub-ntiv nplhaib ob chav rotor khiav nyob rau hauv tib txoj kev, ua ke nrog lub 'X' nkhaus txav ntawm sab saum toj ntsia liaj qhov rooj ntawm refiner, nrog zoo dispersion nyhuv thiab luv luv lub sij hawm, uas yuav zoo txo tau cov scorching mix phenomenon ntawm cov roj hmab phenomenon.
2 - Compounding ntawm ethylene propylene roj hmab
Ethylene propylene roj hmab kuj tseem tuaj yeem ua tiav los ntawm cov khoom siv roj hmab zoo tib yam, tab sis vim tias cov nyhuv plasticizing ntawm ethylene propylene roj hmab yog qhov tsis zoo, qhov tsis muaj viscosity, roj hmab tsis yooj yim los qhwv yob, feem ntau yog thawj zaug siv lub voj voos nqaim, los tsim ib daim ntawv txuas ntxiv thiab nthuav dav cov yob suab rau kev sib tov. Yob kub rau pem hauv ntej yob 50 ~ 60 ℃, tom qab yob 60 ~ 70 ℃ yog tsim nyog. EPDM roj hmab noj kev txiav txim yog feem ntau: raw roj hmab npog yob-1/2 carbon dub-1/2 carbon dub-stearic acid-zinc oxide (los yog magnesium oxide)-promoter-crosslinker-Thin pass, qis daim ntawv. Ethylene propylene roj hmab tsis yooj yim dua-refined thaum sib tov, thiab cov khoom sib xyaw ua ke sib luag, tab sis cov khoom siv tus kheej nplaum tsis zoo. Ethylene-propylene roj hmab sib xyaw nrog qhib refiner, feem ntau ua ntej siv lub sijhawm yob me me kom nws txuas ntxiv tom qab yob, thiab tom qab ntawd maj mam so lub sijhawm yob, ntxiv cov khoom sib xyaw, yob kub ntawm 60 ~ 70 ℃. Qhov sib tov kub yog 150 ~ 160 ℃, uas tuaj yeem pab cov dispersion ntawm muab tub lim thiab softener thiab txhim kho cov khoom siv kho tshuab. Lub peev xwm thauj khoom tuaj yeem yog 10% ~ 15% siab dua li lwm cov khoom siv roj hmab.
3- Kev sib xyaw ntawm fluoroelastomer
Fluorine roj hmab Menny viscosity siab, nruj, kev sib txhuam thaum tshav kub kub, kev sib xyaw thiab kev ua haujlwm nyuaj dua. Thaum sib tov fluorine roj hmab rau ntawm lub tshuab refining, mus rau me me yob deb, tsawg muaj peev xwm, yob kub tswj ntawm 50 ~ 60 ℃. Kev sib tov pib, ua ntej ua kom cov chais txias, ntxiv cov roj hmab nyoos nyias dhau li ntawm 10 lub sij hawm los tsim ib lub hnab ntim cov roj hmab, kho lub sijhawm yob kom tswj tau cov roj hmab me me, thiab tom qab ntawd ntxiv cov tshuaj sib xyaw ua ke, lub sijhawm sib xyaw feem ntau tsis nruj me ntsis, tab sis yuav tsum tau ceev li sai tau. fluorine roj hmab yog qhov nyuaj dua rau kev siv lub tshuab sib tov sib xyaw, tab sis lub tshuab meshing ntawm kev sib xyaw tshuab ua kom txias zog, koj tuaj yeem sib tov fluorine roj hmab. Cov roj hmab sib xyaw yuav tsum tau nres rau 24 teev ua ntej siv, thiab yuav tsum tau ua kom zoo dua ua ntej siv los ua kom cov khoom sib xyaw ua ke sib npaug thiab txhim kho cov dej ntws thiab nws tus kheej-adhesiveness ntawm cov roj hmab.
