Kuchulukitsa kwa hydroxypropyl methylcellulose

Hydroxypropyl methylcellulose imapangitsa matope onyowa okhala ndi kukhuthala kwabwino kwambiri, komwe kumatha kukulitsa luso lomangirira pakati pa matope onyowa ndi gawo loyambira, ndikuwongolera magwiridwe antchito a matope a anti-sag.Amagwiritsidwa ntchito kwambiri popaka matope, njira yotsekera khoma komanso kumanga njerwa mumatope.The thickening zotsatira za mapadi efa kungathenso kuonjezera homogeneity ndi odana ndi kumwazikana mphamvu mwatsopano osakaniza simenti zochokera zipangizo, kupewa delamination, tsankho ndi magazi a matope ndi konkire, ndipo angagwiritsidwe ntchito CHIKWANGWANI konkire, pansi pa madzi konkire ndi kudzipangira compacting konkire. .

Hydroxypropyl methylcelluloseMtengo wa HPMCkumawonjezera mamasukidwe akayendedwe a zinthu zozikidwa pa simenti kuchokera ku mamasukidwe a cellulose ether solution.Mndandanda wa "kukhuthala" nthawi zambiri umagwiritsidwa ntchito poyesa kukhuthala kwa cellulose ether solution.Kukhuthala kwa cellulose ether nthawi zambiri kumatanthawuza njira ya cellulose ether yokhala ndi ndende inayake (monga 2%).Liwiro (kapena kusinthasintha kwa liwiro, monga 20 rpm), mtengo wa viscosity woyezedwa ndi chida choyezera (monga viscometer yozungulira).

Viscosity ndi gawo lofunikira pakuwunika momwe cellulose ether imagwirira ntchito.Kukwezeka kwa kukhuthala kwa hydroxypropyl methylcellulose solution, kumapangitsanso kukhuthala kwa zinthu zopangidwa ndi simenti, kumamatira kwa gawo lapansi, komanso mphamvu zotsutsana ndi kugwa komanso kufalikira.Wamphamvu, koma ngati mamasukidwe ake akachuluka kwambiri, zingakhudze fluidity ndi operability wa zipangizo simenti (monga kumata mpeni 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, imafunikira kukhuthala kwa cellulose ether.

Kuphatikiza apo, kukhuthala kwa hydroxypropyl methylcellulose kudzakulitsa kufunikira kwa madzi pazinthu zopangira simenti, potero kukulitsa zokolola zamatope.

Kukhuthala kwa mayankho a hydroxypropyl methylcellulose kumadalira izi:

Kulemera kwa mamolekyulu (kapena digiri ya polymerization) ndi kuchuluka kwa cellulose ether, kutentha kwa yankho, kumeta ubweya ndi njira yoyesera.

1. Kuchuluka kwa ma polymerization a cellulose ether komanso kukula kwa maselo, kumapangitsanso kukhuthala kwake kwamadzimadzi;

2. Kukwera kwa mlingo (kapena ndende) ya cellulose ether, kumapangitsanso kukhuthala kwake kwamadzimadzi, koma kusamala kuyenera kutengedwa kuti musankhe mlingo woyenera mukamagwiritsa ntchito, kuti musasokoneze ntchito ya matope ndi konkire ngati mlingo ndi wapamwamba kwambiri;

3. Monga zamadzimadzi zambiri, kukhuthala kwa cellulose ether solution kudzachepa ndi kuchuluka kwa kutentha, ndipo kuchuluka kwa cellulose ether kumapangitsanso kutentha kwambiri;

4. Ma cellulose ether solution nthawi zambiri amakhala pseudoplastic, omwe amakhala 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 akhoza kukhala ndi ntchito yabwino komanso yogwirizana panthawi yomweyo.Komabe, yankho la cellulose ether liwonetsa mawonekedwe amadzimadzi a Newtonian pamene ndende imakhala yotsika kwambiri komanso kukhuthala kwake kumakhala kochepa.Pamene ndende ikuwonjezeka, yankho lidzawonetsa pang'onopang'ono makhalidwe a pseudoplastic fluid, ndipo kumtunda kwa ndende, kumakhala koonekeratu pseudoplasticity.