Polyurethane ua npuas ncauj boasts ntau thiab tseem ceeb zoo. Firstly, nws exceptional expansion muaj peev xwm. Tom qab txau, cov npuas dej nrawm nrawm mus rau 20-80 npaug ntawm nws qhov ntim qub, lossis ntau dua. Qhov no tso cai rau nws kom ua tau zoo ua qhov tsis sib xws thiab qhov pores, zam cov teeb meem pov tseg thiab qhov tsis sib xws uas cuam tshuam nrog cov khoom siv niaj hnub.
Thib ob, nws nthuav tawm lub zog sib txuas siab. Cov polyurethane ua npuas ncauj zoo tsim ua npuas ncauj tawv uas ua kom ruaj khov rau ntau yam substrates xws li ntoo, hlau, thiab pob zeb. Nws lub zog shear ncav cuag 0.5-1.0 MPa, deb tshaj ntawm cov nplaum zoo tib yam. Qhov no ua rau nws zoo heev nyob rau hauv structural reinforcement.
Waterproofing thiab thermal rwb thaiv tsev yog lwm qhov tseem ceeb. Qhov kaw -cell piv ntawm cov npuas dej feem ntau tshaj 90%, tiv thaiv kom tsis txhob ya raws thiab ua kom haum rau qhov chaw ntub dej. Tib lub sijhawm, nws cov thermal conductivity tsawg (kwv yees li 0.02-0.03 W / m·K), ob peb zaug ntawm cov khoom siv rwb thaiv tsev, ua rau nws siv dav hauv kev txuag hluav taws xob.
Tsis tas li ntawd, polyurethane ua npuas ncauj kuj muaj lub suab rwb thaiv tsev zoo. Cov qauv ua npuas ncauj nqus cov suab nrov thiab txo cov suab nrov, ua rau lawv feem ntau siv rau kev sib khi lub qhov rooj thiab qhov rais hauv tsev kho kom zoo nkauj los txhim kho kev nyob zoo. Lawv tiv taus tshuaj lom neeg, tiv taus cov kua qaub, alkalis, thiab cov kuab tshuaj organic, ua rau lawv tsim nyog rau kev lag luam.
Los ntawm kev xav ntawm lub cev, cov khoom no yog lub teeb yuag, nrog kev kho qhov ceev ntawm tsuas yog 20-50 kg / m³, uas tsis ua rau muaj kev cuam tshuam ntau ntxiv. Nws kuj muaj ib tug℃ntawm elasticity, muaj peev xwm tiv taus deformation los ntawm thermal expansion thiab contraction, txo txoj kev pheej hmoo ntawm tawg.
Hais txog kev tiv thaiv ib puag ncig, niaj hnub polyurethane ua npuas ncauj nplaum feem ntau siv qis -volatile organic compound (VOC) formulations, txo cov pa phem. Cov kev cai cuam tshuam, xws li GB 18583-2008 "Kev txwv ntawm Cov Khoom Siv Hluav Taws Xob hauv Adhesives rau Sab Hauv Kho Kom Zoo Nkauj thiab Cov Khoom Siv Kho Dua Tshiab," tsim cov kev cai nruj rau cov khoom siv no kom muaj kev nyab xeeb.
Txawm li cas los xij, cov kev txwv yuav tsum tau sau tseg, xws li kev nkag siab rau lub teeb ci ultraviolet thiab kev laus nrog rau lub sijhawm ntev -, ua rau lawv tsis haum rau thaj chaw sab nraum zoov. Zuag qhia tag nrho, txawm li cas los xij, cov yam ntxwv no ua rau polyurethane ua npuas ncauj nplaum yog cov khoom nyiam hauv ntau qhov chaw.