Hydroxypropyl methylcellulose, tseem hu ua hydroxypropyl methylcellulose, yog ib hom non-ionic cellulose ether. Nws yog ib qho khoom siv hluav taws xob, tsis muaj zog, viscoelastic polymer feem ntau siv los ua cov roj nplua nyeem hauv ophthalmology, lossis ua ib qho khoom siv lossis cov khoom siv hauv qhov ncauj.
Txoj kev tsim khoom:
Kho cov paj rwb cellulose refined nrog alkali tov ntawm 35-40 degree rau ib nrab ib teev, nias, zuaj cov cellulose, thiab lub hnub nyoog nws tsim nyog ntawm 35 degree los xyuas kom meej tias qhov nruab nrab polymerization degree ntawm alkali fiber ntau nyob rau hauv qhov xav tau ntau yam. Muab cov alkali fiber ntau rau hauv etherification kettle, ntxiv epoxy propane thiab chloromethane nyob rau hauv ib ntus, thiab etherifie ntawm 50-80 degree rau 5 teev, nrog rau siab tshaj plaws ntawm txog 1.8 MPa. Tom qab ntawd ntxiv qhov tsim nyog ntawm hydrochloric acid thiab oxalic acid rau 90 degree dej kub kom ntxuav cov khoom thiab nthuav qhov ntim. Lub cev qhuav dej nrog lub centrifuge, ntxuav kom txog thaum nruab nrab, thiab thaum cov dej noo hauv cov khoom qis dua 60%, qhuav nrog cua kub ntws ntawm 130 degree kom txog thaum cov dej noo qis dua 5%, thiab thaum kawg tsoo los ntawm 20 mesh sieve kom tau txais. cov khoom tiav.