Qhov tsw ntawm hydroxypropyl methylcellulose cuam tshuam li cas rau qhov zoo?

Cov teebmeem ntawm qhov loj ntawm ntxhiab rau hydroxypropyl methylcellulose yog dab tsi:

Kev sib xyaw ua ke ntawmhydroxypropyl methylcelluloseSiv lye kho cov paj rwb cellulose uas tau ua kom zoo ntawm 35-40 ° C rau ib nrab teev, nias, tsoo cov cellulose, thiab laus kom zoo ntawm 35 ° C, kom qhov nruab nrab ntawm polymerization ntawm cov alkali tau txais yog nyob rau hauv qhov xav tau ntawm cov fibers hauv. Muab cov alkali fiber rau hauv lub lauj kaub etherification, ntxiv propylene oxide thiab methyl chloride ua ntu zus, thiab etherify ntawm 50-80 ° C rau 5 teev, qhov siab tshaj plaws yog li 1.8MPa. Tom qab ntawd ntxiv cov hydrochloric acid thiab oxalic acid rau hauv dej kub ntawm 90 ° C kom ntxuav cov khoom kom nthuav dav. Dehydrate hauv lub centrifuge. Ntxuav nrog dej kom txog thaum nruab nrab. Thaum cov dej noo ntawm cov khoom qis dua 60%, ziab nws nrog cua kub ntawm 130 ° C kom txog thaum cov dej noo qis dua 5%.

Cov HPMC uas tsim los ntawm txoj kev siv cov tshuaj yaj siv toluene thiab isopropanol ua cov tshuaj yaj. Yog tias kev ntxuav tsis zoo, yuav muaj qee qhov tsw ntxhiab me ntsis. Tam sim no, qhov zoo ntawm cov tshuaj hydroxypropyl methylcellulose HPMC hauv tsev sib txawv heev, thiab tus nqi sib txawv ntau, ua rau nws nyuaj rau cov neeg siv khoom xaiv qhov yog. Qhov no yog qhov teeb meem ntawm cov txheej txheem ntxuav, nws tsis cuam tshuam rau kev siv thiab tsis muaj teeb meem, HPMC ntshiab yuav tsum tsis txhob hnov ​​​​​​tsw ammonia, hmoov txhuv nplej siab thiab cawv; AdulteratedHPMCFeem ntau tuaj yeem hnov ​​​​​​txhua yam ntxhiab tsw, txawm tias nws tsis muaj saj, nws yuav hnov ​​​​​​qhov hnyav. Txawm li cas los xij, hydroxypropyl methylcellulose uas ntau lub tuam txhab tsim tawm muaj ntxhiab tsw muaj zog heev thiab ntxhiab tsw qab. Qhov zoo yeej tsis zoo.

Hypromellose tau los ntawm kev muab cov paj rwb zoo nrog cov kua tsis tshua muaj impregnated kom tau txais alkaline cellulose, tom qab ntawd ntxiv cov kuab tshuaj, etherification agent, toluene, thiab isopropanol rau etherification reaction, neutralizing ntxuav, ziab, crushing, thiab lwm yam kom tau txais cov khoom tiav. Zoo, yuav muaj ntxhiab tsw, yog li cov neeg siv tuaj yeem siv nws nrog kev ntseeg siab.