Muaj feem cuam tshuam ntawm ntau qhov ntsuas ntawm polyether polyols ntawm cov khoom ua npuas ncauj-Hydroxyl tus nqi

Feem ntau, polyol tebchaw muaj kev ua haujlwm siab thiab muaj nuj nqis hydroxyl, yog li cov npuas dej npaj muaj siab hardness, zoo txhua yam thiab lub cev muaj zog, thiab zoo kub tsis kam.Txawm li cas los xij, miscibility nrog lwm cov khoom xws li isocyanate tsis zoo.
Cov tshuaj tiv thaiv ntawm hydroxyl tebchaw nrog isocyanates yog ib qho ntawm feem ntau thiab yooj yim cov tshuaj tiv thaiv hauv polyurethane synthesis.Nrog cov ntsiab lus hydroxyl tib yam, cov tshuaj tiv thaiv tus nqi nrog cov degree ntawm kev ua haujlwm loj yog loj, thiab cov viscosity ntawm cov reactant nce sai.Raws li tib yam. kev ua haujlwm siab, kev ua haujlwm siab ntawm polyether nrog cov nqi hydroxyl siab thiab cov reactivity ntawm TDI muaj zog, thiab cov kev ua haujlwm ntawm polyether tsis tshua muaj nqi hydroxyl. Thiab cov reactivity ntawm TDI yog tsis muaj zog.Raws li ob lub ntsiab tshwm sim nyob rau hauv lub foaming txheej txheem: lub reactivity ntawm TDI thiab dej yog sib npaug rau nws cov tshuaj tiv thaiv nrog rau lwm yam cawv, yog li ntawd qhov fluctuations nyob rau hauv tus nqi hydroxyl ntawm polyether yuav rhuav tshem cov tshuaj tiv thaiv sib npaug ntawm TDI thiab polyether. thiab dej thaum lub sij hawm foaming.Yog hais tias tus nqi hydroxyl yog siab, lub reactivity ntawm TDI thiab polyether yog enhanced, thiab lub ntsiab cov tshuaj tiv thaiv yog enhanced.Yog hais tias tus nqi hydroxyl yog qhov tsawg, cov tshuaj tiv thaiv ntawm TDI thiab dej yog txhim kho, ua rau cov tshuaj tiv thaiv tseem ceeb ceev kom tsis txhob ua rau cov tshuaj tiv thaiv foaming ceev, uas tuaj yeem yooj yim ua rau qhov tshwm sim ntawm npuas vau.
Kev hloov pauv ntawm hydroxyl tus nqi ntawm polyether muaj kev cuam tshuam ntau dua rau cov khoom ua npuas ncauj. Tus nqi hydroxyl ntawm polyether ncaj qha cuam tshuam tus nqi ntawm TDI ntxiv. Yog tias tus nqi hydroxyl siab, tus nqi ntawm TDI yuav nce. Yog hais tias tus neeg siv tsis kho tus nqi ntawm TDI, nws yog sib npaug rau ntxiv me ntsis TDI, ua rau ua npuas ncauj tawg, tsis zoo resilience, tsis muaj zog, thiab nce compression mus tas li deformation.Conversely, nws yog sib npaug rau ntxiv TDI ntau dhau, uas yuav ua rau cov npuas dej tsim cov pores loj thiab kaw qhov pores, nce hardness, thiab ua rau kub siab tom qab lub sij hawm ntev maturation.