HPMC (hydroxypropyl methylcellulose) ndi multifunctional polima zowonjezera ntchito kwambiri mu zomangira, makamaka mu zipangizo simenti. Kukhazikitsidwa kwa HPMC kumatha kupititsa patsogolo magwiridwe antchito a simenti, kuphatikiza kulimbikitsa kukana kwa ming'alu, kuwongolera magwiridwe antchito komanso kuwongolera njira ya hydration, potero kumachepetsa kusweka.
Chemical ndi thupi katundu HPMC
HPMC ndi theka-kupanga polima kusinthidwa mankhwala kuchokera mapadi. Kapangidwe kake ka maselo kumaphatikizapo methyl ndi hydroxypropyl substituents, kuwapatsa kusungunuka kwapadera, kukhuthala, kusunga madzi ndi kupanga mafilimu. Zina zake zazikulu ndi izi:
Kusungirako madzi kwambiri: HPMC ili ndi mphamvu yabwino yosungira madzi ndipo imatha kupanga filimu yosungira madzi mkati mwazinthu kuti muchepetse kutuluka kwa madzi.
Thickening zotsatira: HPMC akhoza kwambiri kuonjezera mamasukidwe akayendedwe a slurry, potero kuwongolera workability.
Mafilimu opanga mafilimu: Kukhoza kwake kupanga filimu kumatha kupanga filimu yosinthika pamwamba pa zinthuzo, kupereka chitetezo chowonjezera chakuthupi.
Mphamvu yamakina a HPMC pakung'ambika kwa zinthu zopangidwa ndi simenti
1. Kusunga madzi ndi kuchepetsa ming'alu yowuma yowuma
Zida za simenti zimakhala ndi kuchepa kwakukulu kwa volumetric panthawi yowumitsidwa, makamaka chifukwa cha kutaya kwa madzi ndi kuyanika chifukwa cha hydration reaction. Kuyanika ming'alu ya shrinkage nthawi zambiri kumachitika chifukwa cha kutuluka kwamadzi mwachangu mu slurry ya simenti panthawi yowumitsa, zomwe zimapangitsa kuchepa kwa voliyumu yosagwirizana, potero kumayambitsa ming'alu. Zosungira madzi za HPMC zimagwira ntchito yofunika kwambiri pa izi:
Imachedwetsa kutuluka kwa madzi: HPMC imasunga chinyezi mu slurry ya simenti, motero imachepetsa kuthamanga kwa madzi. Izi zosungira madzi sizimangothandiza kukulitsa nthawi ya hydration reaction, komanso zimachepetsa kuyanika kwakuya komwe kumachitika chifukwa cha kutuluka kwa madzi.
Uniform hydration reaction: Popeza HPMC imapereka malo okhazikika amadzi, tinthu tating'ono ta simenti titha kukhala ndi mawonekedwe ofananirako komanso okwanira hydration reaction, kuchepetsa kupsinjika kwamkati ndikuchepetsa chiopsezo cha kusweka chifukwa chowuma.
2. Kupititsa patsogolo kukhuthala ndi kugawa kufanana kwa zipangizo
HPMC imakhala ndi mphamvu yokulirakulira, yomwe imagwira ntchito yofunika kwambiri pakuwongolera magwiridwe antchito komanso kufananiza kwa zida za simenti:
Kuwonjezeka kwa Viscosity: HPMC imawonjezera kukhuthala kwa slurry, kuwongolera magwiridwe antchito panthawi yogwiritsira ntchito, kulola kuti slurry kuyenda bwino ndikudzaza nkhungu kapena ming'alu, kuchepetsa voids ndi malo osagwirizana.
Kugawa kofanana: Powonjezera kukhuthala kwa slurry, HPMC imapangitsa kugawa kwa zodzaza ndi ulusi mu slurry mowonjezereka, zomwe zimapangitsa kuti mkati mwake mukhale yunifolomu mkati mwa njira yowumitsa ndikuchepetsa kusweka chifukwa cha kupsinjika komwe kumakhalako.
3. Limbikitsani kupanga mafilimu ndi chitetezo cha pamwamba
Mafilimu opanga mafilimu a HPMC amathandizira kupanga chinsalu chotetezera pamwamba pa zinthuzo, zomwe zimathandiza kuchepetsa ming'alu ya pamwamba:
Chitetezo cha pamwamba: Chosanjikiza cha filimu chosinthika chomwe chimapangidwa ndi HPMC pamwamba pa zinthuzo chimatha kuteteza pamwamba pa kukokoloka ndi chilengedwe chakunja komanso kutayika mwachangu kwa chinyezi, potero kuchepetsa kuchitika kwa ming'alu yapamtunda.
Kuphimba kosinthika: Wosanjikiza wa filimuyi amakhala ndi kusinthasintha kwina ndipo amatha kuyamwa gawo la kupsinjika panthawi yopindika pang'ono, potero amalepheretsa kapena kuchepetsa kufalikira kwa ming'alu.
4. Yang'anirani ndondomeko ya hydration
HPMC imatha kuwongolera njira ya hydration ya simenti, yomwe imagwira ntchito yofunika kwambiri pakuchepetsa kupsinjika komwe kumachitika chifukwa cha hydration yosagwirizana:
Kutulutsa pang'onopang'ono kwa hydration: HPMC imatha kuchepetsa kuthamanga kwamadzimadzi, kulola kuti madzi mu slurry ya simenti atulutsidwe pang'onopang'ono, potero amapereka malo ofananirako komanso okhazikika a hydration. Kutulutsa pang'onopang'onoku kumachepetsa kupsinjika komwe kumachitika chifukwa cha kusagwirizana kwa hydration, potero kumachepetsa chiopsezo chosweka.
Zitsanzo zogwiritsira ntchito HPMC muzinthu zosiyanasiyana zopangira simenti
HPMC imagwiritsidwa ntchito kwambiri pazida zopangira simenti, kuphatikiza koma osangokhala ndi pansi pawokha, zokutira kunja kwa khoma, matope ndi zida zokonzera konkriti. Izi ndi zina mwa zitsanzo zogwiritsiridwa ntchito:
1. Zida zodziyimira pawokha
Zida zodziyimira pawokha zimafunikira madzi abwino komanso zomangirira popewa ming'alu yapamtunda. HPMC imathandizira kutuluka ndi kutha kwa zinthuzo kudzera mu kukhuthala kwake komanso kusungitsa madzi ndikuchepetsa kuchitika kwa ming'alu yapamtunda.
2. Kunja kwa khoma utoto
Utoto wakunja umafunikira kumamatira bwino komanso kukana ming'alu. Mawonekedwe opangira filimu ndikusunga madzi a HPMC amathandizira kumamatira komanso kusinthasintha kwa zokutira, potero kumathandizira kuti zokutirazo zisamavutike komanso kusinthasintha kwanyengo.
3. Kukonza zipangizo
Zida zokonzera konkriti zimafunikira mphamvu yayikulu komanso kuuma mwachangu ndikusunga kuchepera kowuma. HPMC imapereka mphamvu zabwino kwambiri zosungira madzi komanso kuwongolera ma hydration, kulola kuti zinthu zokonzetsera zikhalebe zowuma pang'onopang'ono panthawi yowumitsa ndikuchepetsa chiopsezo cha kusweka pambuyo pokonza.
Kusamala pogwiritsa ntchito HPMC
Ngakhale HPMC imakhudza kwambiri kuchepetsa kung'ambika kwa zinthu zopangidwa ndi simenti, mfundo zotsatirazi ziyenera kudziwidwabe pakagwiritsidwe ntchito:
Kuwongolera Mlingo: Mlingo wa HPMC uyenera kukhala wogwirizana ndi zofunikira. Kuchulukira kapena kucheperako kungakhudze magwiridwe antchito. Nthawi zambiri, mlingo uli pakati pa 0.1% - 0.5%.
Kusakaniza Kufanana: HPMC iyenera kusakanizidwa bwino ndi zipangizo zina kuti zitsimikizire kuti zimagwira ntchito ponseponse.
Zomangamanga: Malo omangira (monga kutentha, chinyezi) amakhudzanso mphamvu ya HPMC, ndipo ayenera kusinthidwa moyenerera malinga ndi momwe zinthu ziliri.
Monga chowonjezera chogwiritsa ntchito simenti, HPMC imagwira ntchito yofunika kwambiri pochepetsa kung'ambika kwa zinthu zopangidwa ndi simenti kudzera pakusungirako madzi, kukhuthala, kupanga mafilimu komanso kuwongolera madzi. Imachedwetsa kutuluka kwa madzi, imapangitsa kuti zinthu zifanane, zimateteza zinthu zakuthupi, ndikuwongolera njira ya hydration, potero zimachepetsa kwambiri chiopsezo chosweka. Choncho, pogwiritsira ntchito zipangizo zopangira simenti, kugwiritsa ntchito mwanzeru kwa HPMC sikungowonjezera ntchito zakuthupi, komanso kuwonjezera moyo wake wautumiki ndikuchepetsa ndalama zothandizira.
Nthawi yotumiza: Jun-26-2024