苯甲基化木材溶液代替聚醚制備聚氨酯樹脂的研究.pdf

1、天津大學碩士學位論文苯甲基化木材溶液代替聚醚制備聚氨酯樹脂的研究姓名：魏玉萍申請學位級別：碩士專業(yè)：有機化學指導教師：程發(fā)20021201AbstractThepolyurethaneresinispreparedfromtherenewableresource‘liquefiedwoodandisocyanateinthispaperThepotencialofthisprojectseemstobegreatintheviewofe

2、ithertheefficientUS8ofenergyandrawmaterial，ortheenvironmentalprotectThewoodreSOurceiscomposedofcellulose、semicelluloseandligninItisevidentthatmanypotencialhydroxylsexistinitsstructure；theycarteasilyreactwithisocyanatetop

3、roducepolyurethaneButrecentstudiesmainlyconcentratedonthepolyolsandphenolasliquefyingreagents，ThispaperdealSwithTHF、DBEassolventsfortlleliquefactionofmodifiedwoodandthepreparationofpolyurethaneItisobviOBSthatthesesolvent

4、shavenohydroxylintheirstructureUndoubtedlytheuseofDBEassolventCaneliminatethepollution，whichexistsprevalentlyincurrentcoatingindustryInaddition，theresultantpolyurethanefilmshavegoodpropertiesTheoverallresultsasfollowing：

5、1ConsideringtheliquefactionefficiencyweselectTHFasliquefyingreagent，whichhasasmallvolume、andgoodsolubilityBymeasuringthehydroxylnumber、molecularandmoleculardistributionofthesolution，theoptimalliquefactionconditionisobtai

6、ned，thatis，theliquefyingtimeislowerto6h，theratioofsolventandpowderislowerto6：1，thecatalysiseffectofmixedacidisbeRarthantheacidaloneUnderthiscondition，thehydroxylnumberreachesto500mgKOH／gwoodpowderInaddition，theresultssho

7、wthattheliquefactionconditionandtheweightgainofwoodhavegreatinfluencesonthehydroxylnumberandmoleculardistribution2Combinationtheliquefactioneffciencyandtheresultantpropertiesofthepolyurethaneresin，theDBEisusedassolventwh

8、ichisgenerallyacceptedasbeRerassistantagentinnowadayspaintingindustryThewoodsolutionobtainedreactwitlisocyanateofdifferentstructurebymeasuringthefreeNCOinthepolyurethanesystem，theactivehydroxylCanbedeterminedTheresultssh

9、owthatthecapacityandactivityofhydroxylinthewoodareincreasedgreatlyandthesevaluesarehigherthanthoseoftheliquefiedwoodonlyf3，Theoptimaltechnologicalconditionofpreparationofpolyurethaneisobtained，thatis，theamountofwoodsolut