Ntuj Rubber Mixing Process

Kev sib xyaw ntawm cov roj hmab siv lub zog ntawm cov roj hmab sib xyaw tshuab kom tawg ntau cov khoom xyaw hauv cov roj hmab sib npaug los tsim cov roj hmab nruab nrab lossis roj hmab thiab cov ntaub ntawv tshwj xeeb uas haum rau nws. Nws yog ntau theem colloidal dispersion system siv cov khoom sib xyaw ua ke (cov tshuaj sib xyaw ua ke, lwm yam polymers) raws li qhov nruab nrab thiab cov khoom sib xyaw ua ke tsis sib haum nrog cov roj hmab (xws li hmoov fillers, zinc oxide, pigments, thiab lwm yam) raws li cov theem dispersed. Cov kev cai rau kev sib tov yog raws li nram no: cov compounding agents yuav tsum tau dispersed tusyees kom cov compounding agents, ho reinforcing compounding agents xws li carbon dub, muaj peev xwm ua tiav qhov zoo tshaj plaws dispersion los xyuas kom meej cov roj hmab compound kev ua tau zoo. Cov khoom siv roj hmab tau txais tom qab sib tov yog hu ua "sib xyaw roj hmab," thiab nws qhov zoo yuav cuam tshuam rau kev ua haujlwm ntxiv thiab cov khoom zoo. Hauv qab no, peb tsuas yog qhia txog kev sib xyaw ntawm cov roj hmab ntuj, uas yog ze rau peb cov khoom siv airbag thiab fender.

Ntuj roj hmab yog thawj hom roj hmab siv hauv cov roj hmab mastication. Cov txiaj ntsig zoo tuaj yeem tau txais los ntawm kev siv cov khoom sib tov qhib thiab cov khoom sib xyaw ua ke. Thaum siv lub tshuab qhib rau mastication, qhov kub thiab txias ({1}} degree) nyias-pass (cov menyuam nrug 0.5-1 mm) thiab segmented mastication txoj kev feem ntau yog siv los ua kom tau qhov zoo tshaj plaws. . Thaum siv cov khoom siv sab hauv los pwm, qhov kub yuav tsum qis dua 155 degree, thiab lub sijhawm yuav tsum yog li 13 feeb. Raws li lub sij hawm mastication nce, lub plasticity ntawm masticated roj hmab nce. Txawm li cas los xij, tsis txhob overrefine; Txwv tsis pub, cov yas yuav dhau los ua siab dhau, thiab lub cev thiab cov khoom siv kho tshuab yuav txo qis. Nyob rau hauv ntuj roj hmab mastication, accelerator M yog feem ntau ntxiv raws li ib tug peptizing neeg sawv cev los txhim kho cov nyhuv mastication. Accelerator M yog tsim rau ob qho tib si qhib zeb thiab sab hauv tov khoom plasticizing. Tom qab cov roj hmab ntuj yog masticated, kom so cov roj hmab molecular chains (feem ntau hu ua qaug zog rov qab) thiab ua tiav cov yas zoo li qub, nws yuav tsum tau nres rau qee lub sijhawm (4 mus rau 8 teev) ua ntej nws tuaj yeem siv rau hauv cov txheej txheem hauv qab no.

The main varieties of natural rubber currently used in China include domestic smoked rubber and standard rubber, imported smoked rubber, Malaysian standard rubber, etc. Since the initial Mooney viscosity of the rubber mentioned above differs, the required molding time is different to obtain the same plasticity. The order of the plasticizing time in order of length is imported tobacco sheet rubber>domestic tobacco sheet rubber>domestic standard rubber>Malaysian txheem roj hmab. Tsis tu ncua viscosity thiab tsis tshua muaj viscosity txheem Malaysian roj hmab, roj-extended ntuj roj hmab, lub log roj hmab, thiab cov roj hmab yooj yim-rau-ua hauj lwm muaj tsawg pib Mooney viscosity (feem ntau tsawg dua 65) thiab tuaj yeem sib xyaw ncaj qha yam tsis muaj plasticizing.

Cov roj hmab ntuj (NR) muaj cov khoom siv lub cev thiab cov khoom siv kho tshuab, yog qhov elasticity ntawm chav tsev kub, thiab muaj qhov rov zoo li ntawm 50% mus rau 85%. Cov roj hmab ntuj kuj muaj lub zog txhua yam, zoo flex qaug zog tsis kam, me ntsis hysteresis poob, tsis tshua muaj cua sov tsim nyob rau hauv ntau yam deformations, siab tsim kua muag zog, zoo hnav tsis kam, thiab txias kuj, thiab zoo huab cua nruj, waterproof, hluav taws xob rwb thaiv tsev, thiab thermal rwb thaiv tsev. . Cov roj hmab ntuj muaj alkali tsis kam thiab ua haujlwm zoo rau cov kua qaub tab sis tsis tiv taus cov concentrated thiab khaus acids. Cov roj hmab ntuj kuj muaj cov khoom ua haujlwm zoo, sib xyaw ua ke, zoo yob wrapping zog, roj hmab raw lub zog, thiab pib lub zog. Nws muaj viscosity siab, zoo plasticity, usability, thiab wettability rau compounding agents. Lub plasticity ntawm cov roj hmab nce sai, thiab cov cua sov tsim tsawg. Yog li ntawd, nws muaj zoo wettability rau cov compounding neeg sawv cev, cov hmoov yog devoured, thiab cov dispersion yog kuj yooj yim; lub sijhawm sib tov yog luv luv, thiab cov txheej txheem sib xyaw ua haujlwm yooj yim rau tus tswv. Txawm li cas los xij, cov roj hmab ntuj yog rhiab rau lub sijhawm sib xyaw. Yog hais tias lub sij hawm sib tov luv luv, qhov saum npoo ntawm cov roj hmab sib xyaw yuav tshwm sim granular, ua rau calendering thiab extrusion nyuaj; Yog hais tias lub sij hawm sib tov ntev dhau lawm, nws yuav ua rau over-refining. Thaum sib tov nyob rau hauv ib qho qhib zeb, cov menyuam kub yog nyob nruab nrab ntawm 45 thiab 55 degree, thiab pem hauv ntej cov menyuam yog tsib degree siab tshaj lub rear roller. Internal mixers feem ntau siv ib-theem mixing txoj kev, thiab qhov debonding kub yog qis dua 120 degree.

Peb muaj cov tshuab roj hmab sib xyaw, tshuab daim ntawv qhia hnub, vulcanized boiler thiab peb tuaj yeem tswj tag nrho cov txheej txheem los ntawm peb tus kheej kom ntseeg tau tias txhua yam khoom zoo. Nrhiav rau pem hauv ntej koj nug thiab tuaj xyuas sai sai.