Muaj feem cuam tshuam Ntawm Ntau Qhov Ntsuas Ntawm Polyether Polyols Ntawm Cov Khoom Ua Npuas Ncauj -Acid, Molecular Luj thiab Potassium ion
AV tuaj yeem nthuav tawm nyob rau hauv daim ntawv ntawm hydroxyl tus nqi, yog li tus nqi siab acid noj ntau dua TDI, tab sis tus nqi yog negligible vim qhov me me.Qhov kub ntawm cov tshuaj tiv thaiv thiab qhov nce hauv catalyst concentration yuav ua rau cov tshuaj tiv thaiv sab thiab nce cov kua qaub; tus nqi siab acid noj ntau amine catalysts thaum lub sij hawm ua npuas ncauj, uas txo cov reactivity. Hauv qhov xwm txheej hnyav, cov khoom ua npuas ncauj yuav ntsws thiab kaw lub qhov hws vim kev noj ntau dhau ntawm cov amine catalysts.
Cov khoom ntawm cov polymers feem ntau nce nrog qhov nce ntawm qhov hnyav molecular, xws li tensile lub zog, elongation, melting point, hardness thiab iav hloov kub, thiab lwm yam. Nce nrog qhov nce ntawm molecular hnyav, thaum solubility yog qhov opposite.Qhov kev sib raug zoo no tsis hloov pauv loj tom qab qhov hnyav molecular yog nce mus rau ib qho nqi.Qhov molecular hnyav ntawm polyether tuaj yeem xam los ntawm qhov loj me ntawm hydroxyl, thiab qhov hnyav molecular. yog cuam tshuam los ntawm unsaturated daim ntawv cog lus, yog li cov influencing yam uas ua rau lub molecular hnyav hloov yog zoo ib yam li cov influencing yam ntawm cov℃ntawm unsaturation. Qhov ob yog ib qho kev sib txuas ntxiv, uas yog, tib qib ntawm polyether, qib ntawm unsaturation nce → qhov hnyav molecular txo; cov℃ntawm unsaturation txo → qhov hnyav molecular nce.
Lub xub ntiag ntawm residual catalysts nyob rau hauv lub polyether yuav cuam tshuam ncaj qha rau kev npaj ntawm lub polymerization system thiab lub cev lub cev ntawm polyurethane cov khoom, vim hais tias cov poov tshuaj ions txhawb kev tsim ntawm nruj thiab cross- txuas urea formates thiab diuretics thaum lub sij hawm cov tshuaj tiv thaiv ntawm polyurethane, uas hardens cov khoom ua npuas ncauj, txo elasticity, thiab poov tshuaj gels nyob rau tib lub sij hawm hnyav cov ntsiab lus. Thaum foaming nrog TDI raws li raw khoom, lub foaming tshav kub tsis tau dissipated nyob rau hauv lub sij hawm, ua rau kub kub nyob rau hauv ua npuas ncauj.