Hydroxypropyl Methyl Cellulose (HPMC)ndi ether yosungunuka m'madzi yosungunuka m'madzi, yomwe imagwiritsidwa ntchito kwambiri pomanga, zokutira, mankhwala ndi chakudya. Muzomangira zopangira simenti, HPMC, monga chosinthira, nthawi zambiri imawonjezeredwa kumatope a simenti kuti apititse patsogolo ntchito yake, makamaka pomanga ndikugwiritsa ntchito. Zimakhudza kwambiri kusungunuka kwa madzi, kusunga madzi, kugwira ntchito ndi kukana kwa matope.

 

1. Zotsatira za HPMC pa fluidity ya matope a simenti
The fluidity ya simenti matope ndi chizindikiro chofunika kuyeza ntchito yake yomanga, zomwe zimakhudza mwachindunji ntchito yomanga bwino ndi khalidwe. Monga zakuthupi polima, HPMC ali wabwino kusungunuka madzi ndi ntchito pamwamba. Pambuyo kuwonjezeredwa ku matope a simenti, amatha kupanga filimu yopyapyala kupyolera muzochita za intermolecular, kuonjezera kukhuthala kwamatope, motero kumapangitsa kuti madzi asamayende bwino komanso azitha kugwira ntchito. Mwachindunji, HPMC imatha kusintha kusinthasintha kwa matope, kupangitsa kuti ikhale yosavuta kugwiritsa ntchito ndikugawa mofanana panthawi yomanga, kupewa zovuta zomanga zomwe zimadza chifukwa cha kuyanika kwamatope.

HPMC ingathenso kuwonjezera nthawi yotseguka ya matope, ndiko kuti, kuwonjezera nthawi yogwiritsira ntchito matope panthawi yomanga, ndikupewa zotsatira zomanga zomwe zimakhudzidwa ndi kutuluka kwa madzi mofulumira, makamaka kutentha kwambiri ndi malo owuma.

 

2. Zotsatira za HPMC pa kusunga madzi kwa matope a simenti
Kusungidwa kwamadzi kwa matope a simenti ndikofunikira pakuumitsa kwake komanso kukulitsa mphamvu. Popeza njira ya simenti ya simenti imafuna madzi okwanira, ngati kutaya madzi kwa matope kuli mofulumira kwambiri ndipo simenti ya simenti sikwanira, idzakhudza mwachindunji mphamvu yomaliza ndi kukhazikika kwa matope. HPMC imatha kusintha bwino kasungidwe ka madzi mumatope. Magulu a hydroxypropyl ndi methyl omwe ali m'maselo ake amakhala ndi hydrophilicity yolimba, yomwe imatha kupanga kusanjikiza kofananako kwamadzi mumtondo ndikuchepetsa kuchuluka kwa madzi.

Makamaka m'malo otentha komanso otsika chinyezi, kuwonjezera kwa HPMC kumatha kuchedwetsa kwambiri kuyanika kwa matope a simenti, kuonetsetsa kuti simenti imadzaza ndi madzi, motero kumapangitsanso mphamvu yomaliza ndi kukana kwamatope. Kafukufuku wasonyeza kuti compressive mphamvu ndi durability matope ndi mlingo woyenera wa HPMC anawonjezera zambiri bwino kuposa amene alibe HPMC mu nthawi yaitali kuumitsa ndondomeko.

 

3. Zotsatira za HPMC pa kukana kwa matope a simenti
Ming'alu ndi vuto lofala lomwe limakhudza ubwino wa matope a simenti, makamaka chifukwa cha zinthu monga kuyanika shrinkage, kusintha kwa kutentha, ndi mphamvu zakunja, matope amatha kuphulika. Kuphatikiza kwa HPMC kumatha kupititsa patsogolo kukana kwa matope, makamaka kudzera m'zigawo izi:

Limbikitsani kusungunuka ndi matope a matope: HPMC ili ndi kusungunuka komanso pulasitiki, zomwe zimatha kuthetsa kupsinjika komwe kumadza chifukwa cha kuyanika kwa matope panthawi yochiritsa matope, potero kuchepetsa kuphulika kwa ming'alu.
Wonjezerani kumamatira ndi mphamvu yamatope: HPMC imatha kupititsa patsogolo kumamatira ndi mphamvu yamatope, makamaka pamene gawo lapansi silili lofanana kapena kugwirizana kwa gawo lapansi kuli kolakwika.
Yang'anirani kuchuluka kwa simenti ya simenti: Powongolera kuchuluka kwa simenti ya simenti, HPMC imatha kuchedwetsa kutaya madzi ochulukirapo mumatope a simenti ndikuchepetsa kupsinjika kwamadzi komwe kumachitika chifukwa cha kutuluka kwamadzi mwachangu, potero kulepheretsa kuchitika kwa ming'alu.

 

4. Zotsatira za HPMC pa mphamvu ndi kulimba kwa matope a simenti
Ngakhale kuwongolera magwiridwe antchito ndi kukana kwa matope a simenti, HPMC imakhalanso ndi zotsatirapo zake pakulimba komanso kulimba kwake. Ngakhale kuwonjezera kwa HPMC kudzachepetsa pang'ono mphamvu yoyambirira ya matope chifukwa kapangidwe kake ka maselo kamakhala ndi gawo lamadzi ofunikira kuti simenti ikhale ndi simenti, m'kupita kwanthawi, HPMC imathandiza kutulutsa simenti kwathunthu, potero kumapangitsanso mphamvu yomaliza ya matope.

Komanso, HPMC akhoza kusintha permeability kukana kwa matope simenti, kuchepetsa kukokoloka kwa matope ndi madzi kapena mankhwala, ndi kumapangitsanso durability. Izi zimapangitsa kuti matope omwe ali ndi HPMC awonjezere kugwira ntchito kwanthawi yayitali m'malo onyowa kapena owononga, makamaka oyenera kukongoletsa khoma lakunja, kuyika pansi ndi minda ina.

 

5. Chiyembekezo chogwiritsa ntchito HPMC muzomangira zopangira simenti
Pakuchulukirachulukira kwamatope ochita bwino kwambiri pantchito yomanga, HPMC, monga chowonjezera chofunikira, yawonetsa mwayi wogwiritsa ntchito zida zomangira zopangira simenti. Kuphatikiza pa ntchito zachikhalidwe monga pulasitala pakhoma ndi matope pansi, HPMC itha kugwiritsidwanso ntchito popanga matope odziyimira pawokha, matope okonza, matope osakanikirana ndi zinthu zina kuti apititse patsogolo magwiridwe antchito amatope.

Ndi kusintha kwa zofunikira pakumanga chitetezo cha chilengedwe ndi kukhazikika, kutsika kwa kuipitsidwa ndi kutsika kwa VOC (volatile organic compound) HPMC kumapangitsanso kuti ikhale ndi mwayi wogwiritsa ntchito zipangizo zomangira zobiriwira. Nthawi yomweyo, ndikukula kosalekeza kwa matekinoloje ofananirako, kusinthidwa ndi mafomu ogwiritsira ntchito a HPMC kudzakhala kosiyanasiyana, kupereka mwayi wowonjezera komanso kupanga zida zomangira zopangira simenti.

 

Monga chosinthira matope ofunikira a simenti, hydroxypropyl methylcellulose (HPMC) imathandizira kwambiri ntchito yomanga ndikugwiritsa ntchito zida zomangira zopangira simenti mwa kukonza madzi, kusunga madzi, kukana ming'alu ndi mphamvu yamatope. Ndikusintha kosalekeza kwa zofunikira za zida zomangira, kuchuluka kwa ntchito kwa HPMC kudzakulitsidwa, kukhala chimodzi mwazinthu zofunika kwambiri pakupititsa patsogolo chitukuko cha zida zamakono zomangira.