Kev sib xyaw roj hmab yog kev tshawb fawb ntau yam uas nyuaj thiab muaj ntau yam kev kawm txog kev xaiv thiab sib xyaw cov elastomers nrog ntau yam khoom ntxiv kom ua tau raws li kev ua tau zoo, kev ua tiav, ib puag ncig, thiab tus nqi rau cov khoom siv roj hmab. Cov roj hmab polymers nyoos - txawm tias yog ntuj lossis hluavtaws - muaj cov khoom siv kho tshuab thiab thermal tsawg hauv lawv lub xeev tsis hloov pauv. Kev sib xyaw hloov cov polymers hauv paus no mus rau hauv cov khoom siv tshwj xeeb nrog cov yam ntxwv tsim tshwj xeeb xws li elasticity, hardness, abrasion tsis kam, kub tsis kam, thiab tshuaj lom neeg tsis kam.
Cov khoom xyaw ntawm cov roj hmab sib xyaw
Ib qho roj hmab sib xyaw feem ntau muaj peb txog kaum tsib yam khoom xyaw sib txawv, nrog rau ntau txhiab qhov sib txawv ntawm cov khoom sib xyaw. Cov qauv tau hais tawm hauv cov feem hauv ib puas roj hmab (phr), nrog rau cov polymer puag txheem ntawm 100 phr.
Cov elastomer lossis polymer sib xyaw ua lub hauv paus, txiav txim siab txog cov khoom siv tshuaj lom neeg thiab lub cev tseem ceeb ntawm cov tshuaj. Cov kev xaiv feem ntau suav nrog roj hmab ntuj (NR), uas muaj nqis rau lub zog tensile zoo thiab tiv taus kua muag; roj hmab styrene-butadiene (SBR) rau cov log tsheb; EPDM rau kev tiv taus huab cua thiab UV; thiab roj hmab nitrile (NBR) rau kev tiv taus roj thiab roj.
Cov khoom siv ntxiv dag zog—feem ntau yog cov pa roj carbon dub—tau ntxiv los txhim kho cov khoom siv kho tshuab xws li lub zog tensile, kev tiv taus kev sib txhuam, thiab lub zog tsim kua muag. Qhov loj me ntawm cov pa roj carbon dub thiab kev ua haujlwm ntawm qhov chaw tuaj yeem hloov pauv kom kho cov khoom tshwj xeeb. Silica siv ntau zuj zus, tshwj xeeb tshaj yog hauv cov log tsheb txuag hluav taws xob uas txo qhov kev tiv taus dov yog qhov tseem ceeb. Cov txheej txheem milling roj hmab, Cov khoom siv ntxhia thiab av nplaum ua haujlwm ua lwm txoj hauv kev pheej yig dua, tshwj xeeb tshaj yog rau cov khoom sib xyaw xim.
Lub kaw lus vulcanization (kho) sib txuas cov saw hlau polymer, hloov cov khoom thermoplastic mus ua cov khoom siv thermoset ruaj khov. Sulfur tseem yog cov khoom siv kho mob feem ntau, feem ntau siv ntawm 0.5–35 phr nrog cov khoom siv accelerators (0.5–5 phr) thiab activators (1.0–5 phr). Cov khoom siv accelerators ua rau kev kho sai thiab ua haujlwm tau zoo. Cov kab ke peroxide muaj lwm txoj hauv kev rau cov polymers uas tsis tuaj yeem kho nrog sulfur, muab qhov kub siab dua thiab cov teeb tsa compression qis dua.
Cov tshuaj tiv thaiv suav nrog cov tshuaj antioxidants, uas tiv thaiv cov tshuaj sib xyaw los ntawm kev puas tsuaj los ntawm cua sov thaum lub sijhawm sib tov thiab kev pabcuam, thiab cov tshuaj antiozonants xws li cov quav ciab uas tawg paj rau saum npoo los tiv thaiv kev tawm tsam ntawm ozone. Cov khoom pab ua haujlwm - roj, cov tshuaj plasticizers, thiab peptizers - pab txhawb kev sib xyaw ua ke ntawm cov khoom xyaw, txo qhov viscosity, thiab cuam tshuam rau qhov nyuaj kawg.
Cov Txheej Txheem Sib Tov
Kev sib xyaw ua ke pib nrog kev zom—ua kom cov polymer puas tsuaj los ntawm kev siv tshuab los txo qhov hnyav ntawm cov molecular. Kev sib tov ua tiav los ntawm ob txoj kev tseem ceeb. Lub tshuab zeb ob-yob qhib muaj cov yob tig rov qab uas nws lub nip hloov kho tau tsim kev txiav hnyav. Txoj kev siv tes no muab kev pom zoo heev rau kev hloov kho lub sijhawm tiag tiag, ua rau nws zoo tagnrho rau kev tsim kho thiab cov khoom sib xyaw uas rhiab rau cua sov, txawm hais tias nws qhia txog kev hloov pauv ntau yam. Lub tshuab sib tov sab hauv (Banbury mixer) ua haujlwm hauv chav kaw tag nrho nrog ob lub rotors tig rov qab thiab lub ram uas yuam cov khoom mus rau hauv thaj chaw siab-txiav. Kev sib tov sab hauv uas tsis siv neeg thiab ceev ceev xa cov khoom loj thiab ruaj khov.
Cov yam tseem ceeb suav nrog lub sijhawm sib tov, qhov kub, lub zog ntawm lub ram, qhov ceev ntawm lub rotor, thiab cov txheej txheem ntxiv cov khoom xyaw. Qhov kev txiav txim ntawm kev ntxiv tsis tuaj yeem sib tham tau: polymer ua ntej, tom qab ntawd yog cov khoom sau thiab roj, nrog rau cov khoom kho mob ntxiv rau qhov kub qis dua kom tiv thaiv kev kub hnyiab (kho ua ntej). Kev tswj qhov kub yog qhov tseem ceeb - yuav tsum muaj zog txaus rau kev sib kis zoo yam tsis ua rau muaj kev sib txuas ua ntej.
Cov Ntawv Thov thiab Cov Qauv
Cov roj hmab sib xyaw yog qhov tseem ceeb hauv txhua qhov kev lag luam tsim khoom. Kev lag luam tsheb tseem yog cov neeg siv khoom loj tshaj plaws, nrog rau cov ntawv thov suav nrog cov log tsheb, cov foob pob, cov gaskets, cov hoses, siv, thiab cov khoom siv tiv thaiv kev co. Cov ntawv thov kev lag luam suav nrog cov siv conveyor, cov hoses kev lag luam, cov khoom pwm, thiab cov menyuam. Lwm cov kev lag luam suav nrog cov khoom siv kho mob, aerospace, hlau thiab cable, khau, thiab kev tsim kho.
Kev sib xyaw ua ke niaj hnub no ntsib kev thov kom muaj kev ruaj khov. Kev tswj hwm kev nyuaj siab rau polycyclic aromatic hydrocarbons (PAHs) yog tsav tsheb tsim cov roj bio-based extender, xws li cov roj hempseed kev lag luam, ua lwm txoj hauv kev rau cov roj av. Kev tshawb fawb txog cov khoom siv ruaj khov, cov ntaub ntawv rov ua dua tshiab, thiab cov zinc oxide txo qis qhia txog kev cog lus ntawm kev lag luam rau lub luag haujlwm ib puag ncig. Qhov sib txawv ntawm cov tshuaj tshwj xeeb ua tau zoo rau cov roj teeb tsheb fais fab, kev tswj hwm thermal, thiab kev siv kho mob nruj txuas ntxiv tsav tsheb tshiab.
Kev sib xyaw roj hmab tseem yog ib qho kev kos duab thiab kev tshawb fawb - kev sib npaug ntawm chemistry, physics, lub Hoobkas sib xyaw roj hmab qhib, thiab kev txawj ntse engineering uas ntau txhiab tus sib xyaw ua ke yuav tsum tau kuaj xyuas thiab ua kom zoo. Txhua daim ntawv qhia sawv cev rau ntau teev ntawm kev txhim kho kom ua tiav qhov sib npaug zoo tshaj plaws ntawm cov yam ntxwv ua tiav, cov khoom kawg, thiab kev siv nyiaj tsim nyog - yog vim li cas feem ntau cov neeg sib xyaw tiv thaiv lawv cov ntawv qhia ua cov khoom ntiag tug.
Lub sijhawm tshaj tawm: Lub Rau Hli-18-2026
