Zinthu Zokhudza Kukhuthala kwa Mayankho a HEC: Chidziwitso Chofunikira pa Ntchito Zamakampani

1.Kulemera kwa Maselo ndi Mlingo wa Polymerization

Kulemera kwa molekyulu kwa HEC kumakhudza mwachindunji kukhuthala kwake. Ma polima olemera kwambiri a molekyulu amapanga maunyolo ataliatali, omwe amamatira kwambiri mu yankho, zomwe zimapangitsa kuti kukhuthala kuchuluke. Mwachitsanzo, kafukufuku akuwonetsa kuti HEC yokhala ndi digiri yapamwamba ya polymerization (DP) imapanga mapangidwe olimba ngati gel, zomwe zimapangitsa kuti madzi azisungidwa mu mortars zopangidwa ndi simenti. Kugwiritsa ntchito mafakitale nthawi zambiri kumafuna kulinganiza kulemera kwa molekyulu ndi kugwira ntchito bwino—DP HEC yokwera imatha kukonza kumamatira koma ikhoza kulepheretsa kuyenda kwa mortars wodziyimira pawokha.

2.Kuchuluka kwa HEC mu Yankho

Kukhuthala kumawonjezeka kwambiri ndi kuchuluka kwa HEC. Pa kuchuluka kochepa (monga, 0.2–0.5% mu mortars ya simenti), HEC imapanga madzi osapangidwa ngati pulasitiki omwe amasunga kugwira ntchito bwino pamene akukana kutsika. Komabe, kupitirira muyeso woyenera (monga, >1%) kungayambitse kukhuthala kwambiri, zomwe zimapangitsa kuti kusakaniza ndi kugwiritsa ntchito zikhale zovuta. Kafukufuku pa machitidwe a HEC-alumina akuwonetsa kuti 500 ppm HEC imakhazikika kwambiri ndi ma suspensions kudzera mu steric prohibition, koma kuchuluka kochepa (100 ppm) kumafuna ma surfactants kuti agwire ntchito mofanana.

3.Zotsatira za Kutentha

Chiwonetsero cha mayankho a HECkukhuthala komwe kumadalira kutenthaPamene kutentha kukukwera, unyolo wa polima umachepa chifukwa cha kuchepa kwa mgwirizano wa hydrogen, zomwe zimachepetsa kuchuluka kwa hydrodynamic ndi kukhuthala. Mwachitsanzo, pa 40°C, kukhuthala kwa HEC kumatha kutsika ndi 30–50%, zomwe zimakhudza magwiridwe antchito m'malo otentha. Komabe, HEC imasunga kukhazikika mpaka 90°C, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito pa kutentha kwambiri monga kuboola mafuta.

4.Kuchuluka kwa Kumeta ndi Khalidwe la Pseudoplastic

Mayankho a HEC ndikuchepetsa kudula, zomwe zikutanthauza kuti kukhuthala kumachepa pakagwiritsidwa ntchito mphamvu ya makina (monga kusakaniza kapena kupompa). Izi zimapangitsa kuti zikhale zosavuta kugwiritsa ntchito mu mortar ndi utoto pamene zikugwirizana bwino. Mwachitsanzo, kupulasitala mortar ndi HEC kumakhalabe kogwira ntchito panthawi yopukutira koma kumapewa kufooka pambuyo popaka.

5.Mphamvu ya pH ndi Ionic

Popeza HEC si ionic, imapangitsa kuti isavutike kwambiri ndi pH poyerekeza ndi ma polima a ionic. Komabe, kuchuluka kwa pH kwambiri kapena mphamvu yayikulu ya ionic kumatha kusintha momwe yankho limakhalira. Mu mkhalidwe wa acidic (pH

6.Zowonjezera ndi Zosakaniza Zogwirizana

Kupezeka kwa madzi a ayoni, ma surfactants, kapena mchere kumasintha kukhuthala kwa HEC. Mwachitsanzo:

• Zamadzimadzi a Ionic: Kuwonjezera 1-butyl-3-methylimidazolium bromide kumachepetsa kukhuthala kwa HEC mwa kusokoneza kuyanjana kwa polima ndi madzi.
• Zopangira madzi oundana: Ma surfactants osakhala a ionic (monga, Tween 80) amathandiza kukonzanso kwa ma HEC ouma mozizira.