Rubber vs Latex
Roj Hmab thiab latex yog ob qho tib si elastomers uas qhov ntev tuaj yeem hloov pauv loj thaum muaj kev ntxhov siab, thiab tuaj yeem rov qab mus rau lawv qhov qub qub tom qab kev ntxhov siab raug tshem tawm. Lawv poob rau hauv qeb ntawm cov ntaub ntawv polymeric. Cov khoom siv roj hmab thiab cov khoom siv roj hmab tuaj yeem ua qhov txawv ntawm txoj kev tsim khoom. Tsis tas li ntawd, latex thiab roj hmab tuaj yeem sib txawv ntawm ib leeg, vim latex yog cov khoom siv raw rau roj hmab. Yog li, latex yuav tsum raug txheeb xyuas ua ntej.
Laj
Latex txhais tau tias yog qhov ruaj khov colloidal dispersion ntawm cov khoom polymeric hauv ib qho nruab nrab aqueous. Cov latex feem ntau yog cov kua txiv hmab txiv ntoo, tau los ntawm tsob ntoo Heveabrasiliensis. Hauv latex, muaj ob lub tshuab, uas yog qhov nruab nrab dispersion thiab ib theem dispersed. Hauv latex, roj hmab hais raug tshem tawm hauv qhov nruab nrab aqueous. Roj hmab molecules tam sim no raws li chains nyob rau hauv cov qauv, thiab muaj qhov chaw dawb nyob rau hauv nruab nrab ntawm chains. Yog li, chains tuaj yeem txav tau yooj yim. Yog li los ntawm kev sib txuas ntawm cov roj hmab chains, lub zog tensile thiab cov khoom zoo sib xws tuaj yeem nce hauv cov roj hmab. Cov txheej txheem sib txuas yog hu ua vulcanization. Nyob rau hauv latex, nws yog tov nrog compounding agents (piv txwv li additives ntxiv los txhim kho cov khoom ntawm latex) thiab pre-vulcanized los ntawm cua sov. Lub pre-vulcanized latex yog zoo li tus thiab tsim, ces rhuab rau post-vulcanize. Kom txog rau thaum cov duab tau txais, latex nyob rau hauv lub xeev ua kua; Yog li ntawd, nws muaj peev xwm ua tau nyias zaj duab xis los ntawm dipping thiab casting tawm ntawm latex. Feem ntau, cov latex yog siv los ua cov yeeb yaj kiab nyias, tab sis cov khoom siv kuj tuaj yeem ua los ntawm latex ua npuas ncauj.
Rubber
Roj hmab yog tau los ntawm latex, uas yog tapped los ntawm ntoo. Cov ntoo ntau tshaj plaws uas siv los tsim cov roj hmab yog Heveabrasiliensis. Cov qauv molecular ntawm ntuj roj hmab yog cis-1, 4-polyisoprene. Synthetic rubbers yog siv los tsim cov khoom siv roj hmab. Tab sis thaum xav txog lub sij hawm roj hmab, cov roj hmab ntuj yog feem ntau coj los xav. Tapped latex yog thawj zaug diluted thiab tom qab ntawd nws yog coagulated siv cov kua qaub. Tom qab ntawd, cov coagulated latex yog compressed nyob rau hauv rollers, kom tshem tawm cov dej. Cov khoom yog cov ntaub ntawv nyoos roj hmab. Cov nplooj ntawv no raug coj los ua cov khoom siv roj hmab. Cov nplooj ntawv roj hmab yog sib xyaw nrog cov tshuaj sib xyaw ua ke, txhawm rau muab cov khoom xav tau ntawm cov khoom kawg. Compounded roj hmab yog rhuab kom tau cov khoom tiav. Cov roj hmab yog vulcanized, kom tau txais cov khoom zoo. Vulcanized roj hmab tau txhim kho tensile zog thiab elongation zog, uas yog haum rau kev lag luam ntau lawm hom phiaj. Hauv cov khoom siv roj hmab, vulcanization yog nqa tawm thaum lub sijhawm cua sov. Cov log tsheb yog cov khoom tseem ceeb ntawm roj hmab.
Latex thiab roj hmab muaj ntau yam kev siv vim lawv tus cwj pwm elastic. Ob leeg latex thiab roj hmab yog dej pov thawj. Vim li ntawd, sealants, gaskets, thiab lwm yam yog ua los ntawm roj hmab thiab latex. Cov hnab looj tes, balloons, zoo li cov khoom siv zaj duab xis nyias yog ua los ntawm latex thaum cov khoom zoo li cov log tsheb yog ua los ntawm roj hmab.
Qhov txawv ntawm Roj Hmab thiab Latex yog dab tsi?
• Roj hmab yog tau los ntawm latex, uas yog tapped los ntawm ntoo.
• Cov khoom siv raw rau cov khoom latex yog cov tapping latex; cov khoom siv roj hmab yog cov ntawv roj hmab nyoos.
• Feem ntau, cov khoom latex yog pre-vulcanized, tab sis cov khoom roj hmab yog vulcanized ib zaug xwb.
• Feem ntau, latex yog siv los ua cov yeeb yaj kiab nyias, tab sis cov khoom yog ua los ntawm roj hmab.
