Cov khoom siv roj hmab zoo tshaj plaws rau lub zog tensile thiab qeb duas
Roj hmab yog ib qho tseem ceeb ntawm cov khoom siv elastic polymer, thiab nws cov khoom siv kho tshuab, suav nrog lub zog tensile, elongation ntawm kev tawg, hnav tsis kam, tsim kua muag, thiab lwm yam, yog siv dav hauv kev lag luam, aviation, aerospace, thiab cov neeg siv khoom lag luam. Lub zog tensile yog qhov taw qhia tseem ceeb los ntsuas cov khoom siv hluav taws xob ntawm cov khoom siv roj hmab thiab feem ntau yog hais txog lub zog tensile siab tshaj plaws uas cov khoom siv tuaj yeem tiv taus ua ntej tawg ntawm ib chav tsev hla ntu. Cov hauv qab no tham txog cov khoom siv roj hmab saum toj kawg nkaus hauv cov ntsiab lus ntawm lub zog tensile los ntawm kev xav ntawm cov qauv tshuaj, cov yam ntxwv ntawm kev ua haujlwm, thiab cov ntawv thov tshwj xeeb.
Cov hauv qab no yog qhov qeb duas thiab cov lus piav qhia ntxaws ntxaws ntawm cov roj hmab uas muaj kev ua haujlwm siab raws li lub zog tensile raws li qhov tseem ceeb:
Polyurethane Roj Hmab (PU)
Tensile zog ntau yam: 30-50 MPa
Polyurethane roj hmab yog ib qho ntawm cov neeg kho tshuab zoo tshaj plaws elastomers, nrog lub zog tensile siab heev thiab elongation thaum tawg (txog 500%).
Cov qauv molecular zoo: Cov ntu nyuaj (arromatic lossis aliphatic isocyanates) thiab cov ntu muag (polyether lossis polyester) hauv cov saw molecular tau hloov pauv, muab nws zoo heev tensile thiab tsim kua muag.
Cov yam ntxwv ntawm kev ua tau zoo: Polyurethane roj hmab muaj lub zog tensile siab tshaj plaws ntawm tag nrho cov khoom siv roj hmab, thiab muaj kev puas tsuaj thiab kev cuam tshuam.
Daim ntaub ntawv: Feem ntau yog siv rau qhov chaw nyob rau hauv high-load puag ncig, xws li conveyor siv, rollers, shock absorbing pads, oilfield machinery qhov chaw, thiab lwm yam.
Ntuj Roj Hmab (NR)
Tensile zog ntau yam: 20-30 MPa (siab dua tom qab vulcanization)
Cov roj hmab ntuj yog polyisoprene polymer muab rho tawm los ntawm cov ntoo roj hmab, thiab nws cov qauv molecular tshwj xeeb muab nws elasticity thiab zoo heev tensile zog, tshwj xeeb tshaj yog tom qab vulcanization.
Qhov zoo ntawm cov qauv molecular: Cov pob txha molecular ntawm cov roj hmab ntuj muaj ntau cov cis -1, 4- polyisoprene cov qauv, uas ua rau nws muaj txiaj ntsig zoo thiab sib npaug ntawm cov txheej txheem tensile.
Cov yam ntxwv ntawm kev ua tau zoo: Cov roj hmab ntuj muaj qhov elongation siab heev thaum tawg (txog 500% ~ 700%) thaum ncab, thiab tuaj yeem ua rau pom kev tsim kua muag zoo nyob rau hauv siab loads.
Daim ntaub ntawv: Vim nws lub zog tensile thiab qaug zog tsis kam, nws yog dav siv hauv cov log tsheb, cov ntsaws ruaj ruaj, shock absorbers, conveyor siv, thiab lwm yam uas yuav tsum tau muaj zog txhua yam.
Polybutadiene Roj Hmab (BR)
Tensile zog ntau yam: 15-25 MPa
Butadiene roj hmab paub txog nws cov elasticity tsis tshua muaj siab thiab zoo tiv thaiv kev tawg tawm, thiab nws lub zog tensile yog qhov zoo dua tom qab vulcanization thiab sib xyaw, ua rau nws yog ib qho khoom tseem ceeb hauv ntau qhov chaw lag luam.
Nitrile Butadiene Roj Hmab (NBR)
Tensile zog ntau yam: 10-20 MPa (ntau ntxiv tom qab vulcanization)
Nitrile roj hmab yog dav siv nyob rau hauv cov khoom lag luam vim nws cov roj tsis kam thiab zoo txhua yam muaj zog, tshwj xeeb tshaj yog haum rau chemically corrosive ib puag ncig.
Ethylene propylene diene monomer (EPDM)
Tensile zog ntau yam: 10-18 MPa
EPDM muaj cov huab cua zoo heev, ozone tsis kam, thiab kub tsis kam, thiab yog dav siv nyob rau hauv lubtshebthiab thaj chaw tsim kho.
Silicone Roj Hmab (VMQ)
Tensile zog ntau: 6-15 MPa
Silicone roj hmab paub txog nws qhov tsis kam mus rau qhov kub thiab txias, thiab txawm tias nws tsis muaj zog tensile, nws ua tau zoo nyob rau hauv aerospace thiab kev kho mob.
Fluorocarbon Roj Hmab (FKM)
Tensile zog ntau yam: 10-18 MPa
Fluoroelastomers ua tau zoo nyob rau hauv cov tshuaj thiab qhov kub thiab txias ib puag ncig thiab feem ntau yog siv rau hauv cov ntawv tshwj xeeb uas tiv taus corrosion thiab kub kub.
| Roj hmab hom | Tensile zog (MPa) | Elongation ntawm tawg (%) | Qhov Tseem Ceeb Zoo |
|
PU |
30–50 |
500–800 |
Tsis tshua muaj siab tensile zog thiab abrasion kuj |
|
NR |
20–30 |
500–700 |
High elasticity thiab tawg lub zog |
|
BR |
15–25 |
400–600 |
Zoo tsis kam mus tawg propagation |
|
CR |
10–20 |
200–300 |
Weatherability, roj kuj, thiab nplaim retardancy |
|
NBR |
10–20 |
250–350 |
Zoo heev roj thiab tshuaj tiv thaiv |
|
EPDM |
10–18 |
300–400 |
Kev laus tsis kam thiab ozone kuj |
|
VMQ |
6–15 |
150–300 |
Siab thiab qis-kub kuj thiab biocompatibility |
Nyob rau hauv cov nqe lus ntawm kev ua tau zoo, polyurethane roj hmab occupies thawj qhov chaw nrog lub siab tshaj plaws tensile lub zog thiab hnav tsis kam, thaum ntuj roj hmab nyob qib thib ob nrog nws cov elasticity siab thiab lub zog. Neoprene yog ib qho khoom siv tseem ceeb hauv engineering thiab kev lag luam vim nws qhov sib npaug tensile lub zog (15-25 MPa tom qab vulcanization) thiab zoo heev huab cua tsis kam thiab nplaim retardancy. Raws li qhov yuav tsum tau ua ntawm daim ntawv thov tshwj xeeb, cov khoom siv roj hmab sib txawv muaj lawv qhov kev pom zoo ntawm kev siv thiab qhov zoo.