Kusiyana Pakati pa MDI ndi TDI

Onse TDI ndi MDI ndi mtundu wa zopangira mu polyurethane kupanga, ndipo akhoza m'malo wina ndi mzake mpaka pamlingo wakutiwakuti, koma palibe kusiyana pang'ono pakati TDI ndi MDI ponena za kapangidwe, ntchito ndi kugawa ntchito.

1. Zomwe zili mu isocyanate mu TDI ndizokwera kuposa za MDI, ndipo voliyumu yotulutsa thovu pa unit mass ndi yayikulu.Dzina lonse la TDI ndi toluene diisocyanate, lomwe lili ndi magulu awiri a isocyanate pa mphete imodzi ya benzene, ndipo gulu la isocyanate ndi 48.3%;dzina lonse la MDI ndi diphenylmethane diisocyanate, yomwe ili ndi mphete ziwiri za benzene ndipo gulu la isocyanate ndi 33.6%;Nthawi zambiri, kuchuluka kwa isocyanate kumakhala kokulirapo, voliyumu imatulutsa thovu, kotero poyerekeza ndi ziwirizi, kuchuluka kwa TDI unit misa thovu kumakhala kokulirapo.

2. MDI ndi poizoni wochepa, pamene TDI ndi poizoni kwambiri.MDI ili ndi mpweya wochepa wa nthunzi, siwophweka kugwedezeka, ilibe fungo lopweteka, ndipo ilibe poizoni kwa anthu, ndipo ilibe zofunikira zapadera zoyendera;TDI ili ndi mphamvu ya nthunzi yambiri, yosavuta kusinthasintha, ndipo imakhala ndi fungo lamphamvu.Pali zofunika kwambiri.

3. Kuthamanga kwa ukalamba kwa dongosolo la MDI ndichangu.Poyerekeza ndi TDI, dongosolo la MDI liri ndi liwiro lakuchiritsa mwachangu, kuzungulira kwakanthawi kochepa komanso kuchita bwino kwa thovu.Mwachitsanzo, thovu lochokera ku TDI nthawi zambiri limafunikira kuchiritsa kwa 12-24h kuti likwaniritse ntchito yabwino, pomwe dongosolo la MDI limangofunika 1h kuti likwaniritse bwino.95% kukula.

4. MDI ndiyosavuta kupanga mitundu yosiyanasiyana ya thovu yokhala ndi kachulukidwe wapamwamba wachibale.Posintha kuchuluka kwa zigawo, zimatha kupanga zinthu zokhala ndi zovuta zambiri.

5. Kutsikira kwa ma polymerized MDI amagwiritsidwa ntchito kwambiri popanga thovu lolimba, lomwe limagwiritsidwa ntchito pomanga kupulumutsa mphamvu,firiji zoziziritsa kukhosi, etc. The padziko lonse yomanga nkhani pafupifupi 35% ya polymerized MDI kumwa, ndi nkhani firiji ndi mufiriji pafupifupi 20% ya polima MDI mowa;MDI yoyera makamaka Imagwiritsidwa ntchito popanga zamkati,nsapato zitsulo, elastomer, etc., ndipo amagwiritsidwa ntchito pakupanga zikopa, kupanga nsapato, magalimoto, etc.;pamene kumunsi kwa TDI kumagwiritsidwa ntchito makamaka mu thovu lofewa.Akuti pafupifupi 80% ya TDI yapadziko lonse lapansi imagwiritsidwa ntchito popanga thovu lofewa, lomwe limagwiritsidwa ntchito mu Mipando, magalimoto ndi magawo ena.