Isiphumo se-HPMC esine-viscosities ezahlukeneyo ekusebenzeni kwekhonkrithi

I-Hydroxypropyl methylcellulose (HPMC)yi-non-ionic cellulose ether esetyenziswa kakhulu kwizixhobo zokwakha, ingakumbi kwi-dry-mixed mortar kunye ne-concrete, edlala indima yokugcina amanzi, ukuqina, kunye nokuphucula ukusebenza kolwakhiwo. Ukusebenza kwe-HPMC kuchaphazeleka kakhulu yi-viscosity yayo, kwaye kukho umahluko ocacileyo kwindima ye-HPMC ene-viscosities ezahlukeneyo kwi-concrete.

1. Indlela esisiseko yokusebenza kwe-HPMC

I-HPMC yi-polymer enyibilikayo emanzini enokwenza isisombululo esiqinileyo okanye i-colloid emanzini. Indlela yayo yokusebenza ibandakanya oku kulandelayo:

Ukugcinwa kwamanzi: I-HPMC inokuwavala amanzi akhululekileyo kwisigaba sokuqala sokufuma kwesamente, ithintele ukulahleka kwamanzi, kwaye iqinisekise inkqubela phambili ethe tye yokusabela kokufuma.

Isiphumo sokutyeba: I-HPMC inokunyusa ukutyeba kwe-slurry kwaye iphucule ukungahlukani kunye nokugeleza kwekhonkrithi.

Isiphumo sokwenza ifilimu: I-HPMC inokwenza ifilimu eqhubekayo phezu komphezulu ngexesha lenkqubo yokomisa, nto leyo enceda ekuphuculeni amandla okubopha phakathi kwe-interfacial.

I-HPMC ene-viscosities ezahlukeneyo inemisebenzi eyahlukeneyo kwezi ziphumo zingasentla, enempembelelo ebanzi ekusebenzeni kwekhonkrithi.

2. Imiphumo ethile ye-HPMC viscosity ekusebenzeni kwekhonkrithi

2.1. Impembelelo ekugcinweni kwamanzi

Ukugcinwa kwamanzi yenye yezona mpawu zibalulekileyo ze-HPMC. I-HPMC ene-viscosity ephantsi (umz., ngaphantsi kwe-50,000 mPa·s) inokugcinwa kwamanzi okulinganiselweyo kwaye ifanelekile kwiinkqubo ezifuna ukukhululwa kwamanzi ngokukhawuleza, njenge-plaster mortar. I-HPMC ene-viscosity ephakathi nephezulu (umz., i-100,000 ukuya kwi-200,000 mPa·s) ibonisa ukugcinwa kwamanzi okungcono kwikhonkrithi, nto leyo enokuthintela ngokufanelekileyo ukuvuza kwamanzi kunye nokuphuma kwamanzi ngaphambi kwexesha, ngaloo ndlela iqinisekisa ukufuma kwesamente rhoqo. Ngokukodwa, ukusetyenziswa kwe-HPMC ene-viscosity ephezulu kwiindawo ezomileyo okanye iziseko ezifunxa kakhulu kunokuphucula kakhulu ukumelana nokuncitshiswa kunye nophuhliso lwamandla kwangoko lwekhonkrithi.

2.2. Impembelelo ekusebenzeni kakuhle

I-HPMC inokuphucula kakhulu i-plasticity kunye nokusebenza kakuhle kwekhonkrithi. Ngenxa yesantya sayo sokunyibilika ngokukhawuleza, i-HPMC enobukrakra obuphantsi inokusasaza ngokukhawuleza kwinkqubo, nto leyo enceda ukuphucula ubukrakra bomxube ngexesha elifutshane; kodwa ukuphucula kwayo ixesha lokugcinwa kobukrakra akukuhle njengeemveliso ezinobukrakra obuphezulu. I-HPMC enobukrakra obuphezulu inefuthe elibalulekileyo lokutyeba. Ingaphucula ngokufanelekileyo ukuhambelana komxube kwikhonkrithi, inciphise ukopha kunye nokwahlukana, kodwa ubukrakra obuphezulu kakhulu bunokubangela ukuba ubukrakra bekhonkrithi bunciphe, kwaye kulula ukubangela iingxaki ezifana nokunamathela kwibhareli kunye nokwanda kokumelana nokupompa ngexesha lokwakha. Ke ngoko, ekusetyenzisweni, kuyimfuneko ukukhetha iimveliso ze-HPMC ezinobukrakra obufanelekileyo ngokwendlela yokwakha (njengokuplasta ngesandla, ukutshiza, kunye nokupompa).

2.3. Impembelelo kwixesha lokuseta

I-HPMC ikwanefuthe elithile lokulibazisa kwixesha lokuseta ikhonkrithi, ingakumbi iimveliso ze-viscosity eziphakathi neziphezulu, ezine-encapsulation enamandla yamasuntswana esamente, zithintela ukukhutshwa kobushushu bokufuma, kwaye zilibazise inkqubo yokufuma kwekhonkrithi. Ngokubanzi, njengoko i-viscosity ye-HPMC isanda, ukuthambekela kwayo kokulibazisa ukuseta kubaluleke ngakumbi. Kwisakhiwo sokwenyani, esi siphumo sokulibazisa siluncedo ekwandiseni ixesha lokusebenza kwekhonkrithi, kodwa idosi kufuneka ilawulwe ebusika okanye kwiimeko zobushushu obuphantsi ukuze kuthintelwe ixesha eligqithisileyo lokuseta elichaphazela inkqubela phambili yeprojekthi.

2.4. Impembelelo ekuphuhlisweni kwamandla

I-HPMC ngokwayo ayithathi nxaxheba kwimpendulo yokufunxa isamente, kwaye impembelelo yayo kumandla ekhonkrithi ibonakala kakhulu kwinqanaba lokuqala lophuhliso lwamandla. Nangona i-HPMC ene-viscosity ephezulu inokugcinwa kakuhle kwamanzi, iya kulibazisa impendulo yokufunxa amanzi, nto leyo enokukhokelela ekunciphiseni amandla okuqala. Nangona kunjalo, kwinqanaba lokugqibela, kuba i-HPMC iphucula iimeko zokufunxa amanzi kwaye yenza i-hydrate yesamente ibe nkulu ngakumbi, amandla asemva adla ngokuzinza okanye aphucuke. Ke ngoko, ukhetho olufanelekileyo lwe-medium-viscosity HPMC lunokuqwalasela amandla okuqala kunye nokugcinwa kakuhle kwamanzi, olu lukhetho olufanelekileyo ngakumbi.

2.5. Impembelelo kwiimpawu zokubopha

I-HPMCingayiphucula namandla ayo okubopha ngesiseko esenziwe kwikhonkrithi okanye kwimota. Oku kungenxa yeempawu zayo zokwenza ifilimu, kwaye ngokuyinxenye kunxulumene nokuphuculwa kwayo kwe-slurry viscosity kunye ne-cohesion. Ngokubanzi, i-HPMC ene-viscosity ephezulu inokwenza ujongano lwe-bonding oluxineneyo noluqhubekayo, ngaloo ndlela iphucula amandla e-bonding. Nangona kunjalo, kwizicelo ezisebenzayo, kufuneka kuqwalaselwe ukulinganisela impembelelo yayo ekusebenzeni kolwakhiwo ukuze kuthintelwe ubunzima ekukrweleni ngenxa ye-viscosity egqithisileyo.

Ii-HPMCs ze-viscosities ezahlukeneyo zinezibonelelo kunye neengxaki zazo kwi-concrete. Ngokubanzi:

I-HPMC ethambileyo nethambileyo: ukunyibilika ngokukhawuleza, ukusebenza kakuhle, kodwa ukugcinwa kwamanzi okuncinci kunye nemiphumo yokutyeba;

I-HPMC eqina kakhulu (njenge-70,000-150,000 mPa·s): xa kujongwa ukugcinwa kwamanzi, ukuqina kwawo kunye nokusebenza kwawo, okwangoku lolona hlobo lusetyenziswa kakhulu;

I-HPMC ene-viscosity ephezulu (ngaphezulu kwe-200,000 mPa·s): igcina amanzi kakuhle, kodwa inempembelelo enkulu ekuguquguqukeni kwamanzi, ifanelekile kwiimeko zokusebenza ezineemfuno eziphezulu zokulawula ukuvuza kwamanzi, njenge-surface mortar kunye ne-tile adhesive phantsi kolwakhiwo oluphezulu lobushushu okanye iimeko zemozulu eyomileyo.