Polyurethane kub npaum li cas?
Polyurethane kub npaum li cas?

Video: Polyurethane kub npaum li cas?

Video: Polyurethane kub npaum li cas?
Video: Npaum Li Cas - David Yang (Prod. By Keeneng Vang) 2024, Kaum ib hlis
Anonim

Yam khoom muaj nqis. Feem ntau, polyurethane tau siv nyob rau hauv qhov kub ntawm -62 ° C mus rau 93 ° C (-80 ° F txog 200 ° F). Tshwj xeeb formulations tau txuas ntxiv polyurethane ua Kev ua tau zoo ncav cuag li 150 ° C (300 ° F).

Ntawm no, polyurethane kub kub li cas?

Polyol kub hnyiab kub li ntawd, nyob rau hauv qhov tseeb, tsim ib tug 'kem hluav taws' ntawm cov nplaim taws kub heev (Daim duab 4). Tus qauv kwv yees tus nplaim taws pem hauv ntej mus txog 14 feet ntawm qhov siab nrog nplaim taws kub nce mus txog 1500 degrees Fahrenheit (kwv yees li 820 degrees Celsius, daim duab 2).

Tsis tas li ntawd, puas muaj qhov kub-resistant polyurethane? Polyurethane varnish yog heev ruaj. Roj-raws li polyurethane yog ib tug heev check finish, tab sis nws kuj yog ib qho yooj yim mus thov. Nws yog tiv taus rau kub , tshuaj, thiab hnav thiab tsim kua muag xws li khawb. Dej-raws polyurethane yuav tsis nkag mus tus ntoo li tob, thiab kuj tsis ntxiv xim rau tus ntoo.

Ib yam li ntawd, kub puas cuam tshuam rau polyurethane?

Kub Ntau yam. Standard thermoset polyurethanes tau feem ntau tiv taus kub ntawm -80 ° F txog 200 ° F. Txawm li cas los xij, qee qhov polyurethane chemistry tau muaj siab kam rau ua kub , siab li 300 ° F. Sab nraud ntawm cov no kub , thermoset polyurethanes yuav yuav tsis muaj zog los yog degrade thaum lub sij hawm.

Yuav ua li cas thaum koj kub polyurethane?

Thaum lub polyurethane ua npuas ncauj ncav cuag lub decomposition kub , nws decomposes rau hauv yaj thiab roj los ntawm thawj cov tshuaj tiv thaiv. Thaum lub sij hawm smoldering theem ntawm hluav taws kub los yog ua ntej piloted ignition, polyurethane ua npuas ncauj raug kub yuav oxidised rau ib co degree los ntawm cov pa oxygen nyob rau hauv cov huab cua.

Pom zoo: