i-hydroxypropyl methylcellulose (HPMC) kuplasta elula esekelwe ku-gypsum

I-plaster elula esekelwe ku-gypsum iyinto yokwakha enobungani nemvelo esetshenziswa kabanzi ekulinganiseni udonga lwangaphakathi, izinhlelo zokushisa kanye nokwelashwa kwesisekelo sokuhlobisa. Yenziwe nge-gypsum yokwakha njengezinto eziyinhloko zokuqinisa, ehambisana nama-aggregates alula (njenge-perlite, ama-microspheres ane-vitrified, amabhola e-foam, njll.). Ngenxa yezici ze-gypsum ngokwayo, njengokujiya okusheshayo kanye nesivinini sokuqina, izinga lokuncibilika okukhulu, kanye nokucola okulula, ukuze kuthuthukiswe ukusebenza kwayo kokwakhiwa kanye nekhwalithi yokusetshenziswa, ngokuvamile kuyadingeka ukwengeza izithasiselo ezahlukahlukene ukuze kuthuthukiswe ukusebenza kwayo. Phakathi kwazo,i-hydroxypropyl methylcellulose (HPMC), njenge-cellulose ether ebalulekile esebenzayo, idlala indima engenakuphindwa kuplasta elula esekelwe ku-gypsum.

1. Izakhiwo eziyisisekelo ze-HPMC

I-HPMC iyi-polymer engeyona i-ionic encibilikayo emanzini eyenziwe ngokuguqulwa kwe-etherification kwe-cellulose yemvelo enama-molecule amaningi. Inezakhiwo ezinhle zokugcina amanzi, ukuqina, ukuthambisa, ukwakha ifilimu kanye nokumiswa. Ivame ukungezwa ngesimo sempuphu ku-plaster, udoti nezinye izinto zokwakha ezixutshwe okomile, futhi iyavuvukala futhi incibilike ngokushesha uma ihlangana namanzi ukuze idlale indima.

2. Indima eyinhloko ye-HPMC kuplasta olula olusekelwe ku-gypsum

2.1. Thuthukisa ukugcinwa kwamanzi futhi wandise isikhathi sokusebenza

I-Gypsum inesikhathi esifushane sokuqala sokubeka kanye nokumuncwa kwamanzi okunamandla, futhi ithambekele ekulahlekelweni kwamanzi ngokushesha ngesikhathi sokwakha, okuholela ezinkingeni ezifana nokuqhekeka kanye nokuputshwa. I-HPMC inokugcinwa kwamanzi okuhle kakhulu futhi ingakha ifilimu lamanzi elifanayo ku-slurry, inciphise ukungena kwamanzi mahhala ku-substrate, futhi ilibazise ukuhwamuka kwamanzi, ngaleyo ndlela:

Qinisekisa ukuthi i-gypsum iphendula ngokuphelele ngamanzi futhi uthuthukise amandla ezinto zokwakha;

Nciphisa ukuqhekeka kokuncipha futhi uthuthukise ikhwalithi ebonakalayo;

Yandisa isikhathi sokusebenza kokwakhiwa, thuthukisa ukusebenza kahle komsebenzi kanye nokuzivumelanisa nezimo kokwakhiwa, ikakhulukazi ezindaweni ezinokushisa okuphezulu kanye nezindawo ezomile.

2.2. Thuthukisa ukwakhiwa kanye nokusebenza kahle

I-HPMC ingathuthukisa kakhulu ukuhambisana kanye nobuningi beplasta ye-gypsum, yenze i-slurry yayo ibe bushelelezi futhi ithambekele kakhulu. Kuboniswe ngokukhethekile ku:

Kulula ukuxuba nokusebenzisa, kulula ukufaka;

Nciphisa ukushelela kwezinto kanye nokuba yimpuphu;

Qinisekisa ukuthi i-plaster odongeni iyafana futhi uthuthukise ukuthamba komphezulu.

2.3. Thuthukisa ukunamathela kanye nezakhiwo zokulwa nokuwa

I-HPMC ingakha ifilimu yokumunca kahle ngokomzimba phakathi kwe-slurry kanye ne-substrate, ithuthukise ukunamathelana phakathi kwe-plaster kanye nobuso bodonga, ngaleyo ndlela ngempumelelo:

Nciphisa izinkinga zokugoba nokuwa;

Thuthukisa ikhono lokulwa nokugoba ekwakhiweni kwendawo eqondile, okwenza izinto zingasheleli phansi, okuvumela ukwakhiwa kwezingqimba ezijiyile;

Siza ekwakheni ungqimba lokuqeda olubushelelezi noluqinile.

2.4. Lungisa ukuhambisana kanye nomphumela wokujiya

I-HPMC inekhono elihle lokulawula i-viscosity yesisombululo. Ngemva kokuncibilika emanzini, yakha uhlelo lwe-viscoelastic colloid, oluqinisa yonke i-slurry ye-gypsum, luvimbele ngempumelelo ukuhlukaniswa nokuhlukaniswa, futhi luthuthukise ukuzinza kwevolumu yezinto zokwakha. Ngesikhathi esifanayo, ngokwezinga le-viscosity kanye nenani lokwengeza lezinhlobo ezahlukene ze-HPMC, abasebenzisi bangakwazi ukulungisa ngokuguquguqukayo ukuhambisana kwe-plaster ukuze bazivumelanise nezindlela ezahlukene zokwakha (njengokuplasta ngesandla kanye nokufutha ngomshini).

2.5. Thuthukisa ukumelana nokuqhekeka ngemva kokwakhiwa

Iplasta elula esekelwe ku-gypsum ivame ukuqhekeka ngenxa yokukhanya kwayo kanye nesivinini esikhulu sokuqhekeka. I-HPMC inganciphisa ukugxilisa ingqondo kanye nokuqhekeka ngokuthuthukisa ukugcinwa kwamanzi, ukusetha kancane kanye nokuguquguquka. Ngaphezu kwalokho, i-HPMC ingathuthukisa futhi ukumelana nokuguquguquka kweplasta, okwenza ifaneleke kakhulu ezindaweni ezahlukene zesisekelo.

3. Izinyathelo zokuqapha zokusebenzisa i-HPMC

Indlela yokwengeza: I-HPMC ngokuvamile ixutshwa nezinye izimpushana njengengxube eyomile kusengaphambili. Akukhuthazwa ukuyifaka ngqo emanzini bese uyixuba ukuze ugweme ukuhlangana.

Ukulawula umthamo: Ukwengeza ngokweqile kungaholela esikhathini sokujiya ngokweqile, amandla anciphile, kanye nokunamathela okunciphile. Inani elinconywayo ngokuvamile lokwengeza lingu-0.1% ~ 0.5%.

Ukukhethwa kwemodeli: I-HPMC ene-viscosities ehlukene kanye namazinga okushintshana kufanele ikhethwe ngokuya ngomklamo womkhiqizo ukuze kucatshangelwe kokubili ukusebenza kokwakhiwa kanye nokusebenza komkhiqizo oqediwe.

4. Ukubaluleka kwe-HPMC ekukhuthazeni izinto zokwakha eziluhlaza

Ngaphansi komkhuba wamanje wokukhuthaza ukonga amandla nokwakhiwa okunobungani nemvelo, iplasta elula esekelwe ku-gypsum isetshenziswa kakhulu ezakhiweni eziluhlaza ngenxa yezinzuzo zayo zezinsiza ezivuselelekayo, ukukhishwa kwekhabhoni okuphansi, kanye nenduduzo enhle. I-HPMC, njengesithasiselo esibaluleke kakhulu esisebenza kahle kakhulu efomini yeplasta ye-gypsum, ayithuthukisi nje kuphela ukusebenza kwayo, kodwa futhi ithuthukisa ukusebenza kwayo kahle kokwakhiwa kanye nesilinganiso sokusetshenziswa kwezinto, inciphisa imfucuza yezinsiza ebangelwa ukulungiswa kabusha, futhi iyisikhuthazo esibalulekile sokukhuthaza intuthuko esimeme yezinto zokwakha eziluhlaza.

I-Hydroxypropyl methylcellulose (HPMC) idlala indima eminingi kuplasta elula esekelwe ku-gypsum, okuhlanganisa ukugcinwa kwamanzi, ukuqina, ukuthambisa, ukuvimbela ukugoba kanye nokubopha okuthuthukisiwe, okuthuthukisa kakhulu ukusebenza kahle, izakhiwo zemishini kanye nempilo yesevisi ye-gypsum plaster. Njengoba isidingo esikhulayo sezinto ezilula, ezonga amandla kanye nezingangcolisi imvelo embonini yokwakha sikhula, ukubaluleka kwe-HPMC ezinhlelweni ezisekelwe ku-gypsum kuzobonakala kakhulu, futhi inani layo lobuchwepheshe kanye nendawo yokusetshenziswa emakethe kuzoqhubeka nokukhula. Ukukhethwa nokusetshenziswa okufanele kwe-HPMC kuzohlinzeka ngesisekelo esiqinile sokuthuthukisa ukusebenza kwezinhlelo ze-gypsum plaster nokuqinisekisa ikhwalithi yamaphrojekthi okwakha.