Dab tsi yog qhov txawv ntawmpolyurethanethiab roj hmab?
Feem ntau muaj 3 qhov sib txawv.
1. Cov khoom tshwj xeeb:
Polyurethane yog ib qho polymer uas muaj urethane pawg hauv nws cov pob txha thiab tau muab faib ua ob hom: polyester polyurethane thiab polyether polyurethane.
Ntawm qhov tod tes, roj hmab yog cov khoom siv polymer uas muaj zog heev uas nthuav tawm rov qab deformation. Nyob rau hauv chav tsev kub, roj hmab tseem elastic, muaj peev xwm ua rau deformations loj heev nrog rau sab nraud quab yuam, thiab tam sim ntawd rov qab mus rau nws tus qub zoo tom qab tshem tawm quab yuam.
Qhov tseem ceeb, roj hmab yog amorphous nkaus, nrog lub iav hloov pauv kub (Tg) thiab nquag siab molecular hnyav, feem ntau tshaj li pua pua txhiab.
2. Divergent Composition:
Roj hmab yog muab los ntawm latex, thiab cov khoom siv roj hmab zoo khaws qee yam tsis yog roj hmab los ntawm cov latex.
Feem ntau, cov roj hmab ntuj muaj 92%-95% roj hmab hydrocarbons, nrog rau cov roj hmab uas tsis yog roj hmab muaj 5%-8%. Cov dej noo ntawm cov roj hmab qhuav yog feem ntau tsawg dua 1%.
Hloov pauv, polyurethane feem ntau tso siab rau cov organic polyisocyanates thiab hydroxyl-terminated compounds raws li nws cov ntaub ntawv tseem ceeb.
3. Cov yam ntxwv sib txawv:
Roj hmab:
- Cov roj hmab ntuj boasts qhuas hnav tsis kam, siab elasticity, tawg lub zog, thiab elongation.
- Styrene-butadiene roj hmab, cov khoom siv tau zoo, tsis muaj roj tsis kam, tab sis muaj cov dej tsis zoo thiab elasticity ntawm 70 hardness, nrog txo qis compressibility ntawm hardness siab dua.
- Hydrogenated nitrile roj hmab excels nyob rau hauv corrosion kuj, tensile zog, tsim kua muag kuj, thiab compression kuj.
Polyurethane:
- Polyurethane nthuav tawm cov neeg kho tshuab siab zog thiab oxidation stability.
- Nws qhia txog kev yooj yim thiab elasticity.
- Polyurethane sawv tawm nrog tshwj xeeb roj tsis kam, hnyav tsis kam, dej tsis kam, thiab hluav taws kub.
Polyurethane thiab roj hmab sib txawv hauv lawv cov tshuaj muaj pes tsawg leeg, cov khoom, thiab kev siv. Polyurethane yog cov khoom siv polymer uas muaj cov urethane pawg, paub txog kev siv tshuab ua haujlwm siab, hloov tau yooj yim, thiab ua haujlwm zoo rau cov roj, cov kuab tshuaj, dej, thiab hluav taws.
Roj Hmab, ntawm qhov tod tes, yog cov khoom siv polymer uas muaj zog heev nrog rov qab deformation, lees paub rau nws cov elasticity, hnav tsis kam, thiab ntau yam kev siv. Qhov sib txawv yog nyob rau hauv lawv cov qauv molecular, nrog polyurethane muab ntau yam khoom siv thiab tshuaj lom neeg piv rau roj hmab.