Hydroxypropyl Methyl Cellulose Synthesis Method
Jul 30, 2019
Cov paj rwb huv huv cellulose kho nrog kev daws teeb meem alkali ntawm 35 txog 40 ° C rau ib nrab ib teev, nias, thiab lub cellulose pulverized thiab tsim nyog muaj hnub nyoog ntawm 35 ° C kom tau txais qhov nruab nrab ntawm polymerization ntawm cov tau alkali fibers nyob rau hauv qhov xav tau khwv. Lub alkali fiber tau them rau hauv lub hnab hluav taws xob etherification, thiab propylene oxide thiab methyl chloride tau ntxiv rau qhov ntawd ntxiv, thiab etherified ntawm 50 rau 80 ° C rau 5 teev, thiab qhov siab tshaj yog txog 1.8 MPa. Tom qab ntawd, qhov tsim nyog ntawm hydrochloric acid thiab oxalic acid ntxiv rau hauv dej kub ntawm 90 ° C kom ntxuav cov khoom kom nthuav dav ntim. Lub cev qhuav dej nrog cov centrifuge. Ntxuav kom nyob nruab nrab, thaum dej ntsiab lus hauv cov khoom siv yog qis dua 60%, qhuav mus txog 130% lossis tsawg dua nrog cov cua kub ntawm 130 ° C.
