Kuchulukitsa kwa hydroxypropyl methylcellulose

Hydroxypropyl methylcelluloseMtengo wa HPMCimapanga matope onyezimira okhala ndi kukhuthala kwabwino kwambiri, komwe kumatha kukulitsa kumamatira pakati pa matope onyowa ndi gawo loyambira, ndikuwongolera magwiridwe antchito amatope a anti-sagging. mu matope. The thickening zotsatira za cellulose ether kungathenso kuonjezera homogeneity ndi odana ndi kubalalitsidwa luso latsopano simenti zochokera zipangizo, kupewa delamination, tsankho ndi magazi a matope ndi konkire, ndipo angagwiritsidwe ntchito CHIKWANGWANI-amalimbitsa konkire, pansi pa madzi konkire ndi kudzipangira compacting. konkire .

Hydroxypropyl methylcellulose imawonjezera kukhuthala kwa zinthu zopangidwa ndi simenti kuchokera ku viscosity ya cellulose ether solution. Kukhuthala kwa cellulose ether solution nthawi zambiri kumawunikidwa ndi index "viscosity". Kukhuthala kwa cellulose ether nthawi zambiri kumatanthawuza kuphatikizika kwina (monga 2%) ya njira ya cellulose ether pa kutentha kwapadera (monga 20 ° C) ndi kumeta ubweya Mlingo wa viscosity woyezedwa ndi chida choyezera (monga viscometer yozungulira) pa liwiro la liwiro (kapena kusinthasintha, monga 20 rpm).

Viscosity ndi gawo lofunikira pakuwunika momwe cellulose ether imagwirira ntchito. Kuchuluka kwa mamasukidwe amphamvu a hydroxypropyl methylcellulose solution, kumapangitsanso kukhuthala kwa zinthu zokhala ndi simenti, kumamatira kwa gawo lapansi, kumapangitsanso mphamvu yotsutsa komanso yoletsa kubalalitsa. Wamphamvu, koma ngati mamasukidwe ake akachuluka kwambiri, zingakhudze fluidity ndi operability wa zipangizo simenti (monga kumata mipeni pulasitala pa pulasitala yomanga matope). Choncho, mamasukidwe a cellulose ether omwe amagwiritsidwa ntchito mumatope osakaniza owuma nthawi zambiri amakhala 15,000 ~ 60,000 mPa. S-1, matope odziyimira pawokha ndi konkriti yodzipangira yokha yomwe imafunikira madzi ochulukirapo amafunikira kukhuthala kochepa kwa cellulose ether.

Kuphatikiza apo, kukhuthala kwa hydroxypropyl methylcellulose kumawonjezera kufunikira kwa madzi pazinthu zopangira simenti, motero kumawonjezera zokolola zamatope.

Kukhuthala kwa njira ya hydroxypropyl methylcellulose kumadalira izi:

Ma cellulose ether molecular weight (kapena digiri ya polymerization) ndi ndende, kutentha kwa yankho, kumeta ubweya wa ubweya, ndi njira zoyesera.

1. Kuchuluka kwa ma polymerization a cellulose ether, kukula kwake kwa maselo, komanso kukulitsa mamasukidwe ake amadzimadzi;

2. Kukwera kwa mlingo (kapena ndende) ya cellulose ether, kumapangitsanso kukhuthala kwa njira yake yamadzimadzi, koma chidwi chiyenera kuperekedwa posankha mlingo woyenera pochigwiritsa ntchito, kuti tipewe mlingo wochuluka komanso kukhudza kugwira ntchito kwa matope. ndi konkriti;

3. Mofanana ndi zakumwa zambiri, kukhuthala kwa cellulose ether solution kudzachepa ndi kuwonjezeka kwa kutentha, ndipo kuchuluka kwa cellulose ether kumapangitsanso kutentha;

4. Ma cellulose ether solutions nthawi zambiri amakhala pseudoplastics okhala ndi kumeta ubweya wa ubweya. Kuchuluka kwa kumeta ubweya wa ubweya panthawi yoyesedwa, kumachepetsa kukhuthala.

Choncho, kugwirizana kwa matope kudzachepetsedwa chifukwa cha mphamvu yakunja, yomwe imakhala yopindulitsa pakumanga matope, kotero kuti matope amatha kukhala ndi ntchito yabwino komanso yogwirizana panthawi yomweyo. Komabe, pamene ndende ya mapadi etere njira ndi otsika kwambiri ndi mamasukidwe akayendedwe ndi laling'ono kwambiri, izo kusonyeza makhalidwe a Newtonian madzimadzi. Pamene ndende ikuwonjezeka, yankho lidzawonetsa pang'onopang'ono makhalidwe a pseudoplastic fluid, ndipo kumtunda kwa ndende, kumakhala koonekeratu pseudoplasticity.