Tam sim no ntau tus neeg tsis paub ntau txog hydroxypropyl starch ether. Lawv xav tias muaj qhov sib txawv me ntsis ntawm hydroxypropyl starch ether thiab cov hmoov txhuv nplej siab, tab sis nws tsis yog. Tus nqi ntawm hydroxypropyl starch ether siv rau hauv cov khoom khib nyiab yog tsawg heev, thiab qhov sib ntxiv ntawm cov polar tuaj yeem ua tiav cov txiaj ntsig zoo.
Hydroxypropyl starch ether (HPS) yog cov hmoov zoo dawb uas tau txais los ntawm kev hloov cov nroj tsuag ntuj, muaj etherified, thiab tom qab ntawd tshuaj tsuag qhuav, tsis muaj plasticizers. Nws txawv kiag li ntawm cov hmoov txhuv nplej siab zoo tib yam los yog hloov cov hmoov txhuv nplej siab.
Thiab hydroxypropyl methyl cellulose, tseem hu ua hypromellose, hydroxypropyl methyl liab vitamin ether, yog siv cov paj rwb ntshiab heev cellulose li raw cov ntaub ntawv, thiab kho nws nrog lye ntawm 35-40 ° C rau ib nrab ib teev, nyem, crushed cellulose, thiab hnub nyoog kom zoo ntawm 35 ° C, fiber ntau yuav tsum tau nyob rau hauv ib tug nruab nrab degree ntawm polymerization. Muab cov alkali fiber ntau tso rau hauv etherification kettle, ntxiv propylene oxide thiab methyl chloride ua ntu zus, thiab etherify nws ntawm 50-80 ° C rau 5 teev, thiab qhov siab tshaj plaws yog li 1.8MPa. Tom qab ntawd ntxiv qhov tsim nyog ntawm hydrochloric acid thiab oxalic acid rau hauv dej kub ntawm 90 ° C los ntxuav cov khoom kom nthuav dav, tom qab ntawd dehydrate nws nrog lub centrifuge, thiab thaum kawg ntxuav nws rov qab mus rau qhov nruab nrab. Siv dav hauv kev tsim kho, tshuaj lom neeg kev lag luam, xim, tshuaj, tub rog kev lag luam thiab lwm yam kev lag luam, raws li tus neeg sawv cev ua yeeb yaj kiab, binder, dispersant, stabilizer, thickener, thiab lwm yam.
Hydroxypropyl starch ether tuaj yeem siv los ua cov khoom sib xyaw rau cov khoom siv cement, cov khoom siv gypsum thiab cov khoom siv calcium calcium. Nws muaj zoo compatibility nrog rau lwm lub tsev admixtures. Siv ua ke nrog hydroxypropyl methylcellulose ether HPMC, nws tuaj yeem txo qhov ntau npaum ntawm hydroxypropyl methylcellulose (feem ntau ntxiv 0.05% ntawm HPS tuaj yeem txo cov koob tshuaj HPMC li ntawm 20% -30%)), thiab tuaj yeem ua kom cov nyhuv thickening, los txhawb cov qauv sab hauv, nrog kev ua haujlwm zoo dua tawg thiab txhim kho kev ua haujlwm.
Post lub sij hawm: Apr-24-2023