I-HPMC (i-Hydroxypropyl Methylcellulose) yimbumba yepolymer enyibilikayo emanzini efunyenwe ngokuguqulwa kweekhemikhali zeselulosi yendalo. Isetyenziswa ngokubanzi kwibala lepeyinti kunye neengubo ngenxa yokuqina kwayo okulungileyo, ukuzinzisa, kunye nokugcinwa kwamanzi. I-HPMC inokuphucula kakhulu i-rheology, ukuzinza, kunye nokusebenza kokwakhiwa kwengubo, ukuqinisekisa ukuba i-coating inomsebenzi ozinzileyo ngexesha lokugcinwa, ukuthutha, kunye nokwakhiwa, kunye nokufumana ifilimu yokugqoka efanayo.
(1) Iipropati ezisisiseko ze-HPMC
I-HPMC yi-ether ye-cellulose engeyo-ionic enezi mpawu zilandelayo:
Isiphumo sokutyebisa: I-HPMC inokwenza isisombululo se-viscous kumanzi kunye nezinyibilikisi eziphilayo, ezinokwandisa ngokufanelekileyo i-viscosity yotyatyazo, ngaloo ndlela ikhulise ukusebenza kokugquma kwengubo kunye nobukhulu bokugquma.
Isiphumo sokugcina amanzi: I-HPMC inomthamo ogqwesileyo wokugcinwa kwamanzi kwaye inokuthintela ukuvela komphunga okukhawulezayo kwamanzi kwindawo yokwaleka. Ngokukodwa ifanelekile kwiingubo ezisekelwe emanzini ezifuna ukusetyenziswa kwindawo eyomileyo.
Ipropathi yokwenza ifilimu: I-HPMC, njengoncedo lokubumba ifilimu, inokunceda i-coating yenze ifilimu egudileyo kunye nefanayo yokugqoka ifilimu ngexesha lokumisa, ukuphucula ukubonakala kunye nokukhanya kwefilimu yokugqoka.
Ukuhambelana: I-HPMC inozinzo oluhle lweekhemikhali kunye nokuhambelana neentlobo zezithako zokuqulunqa, kwaye ifanelekile kwiindidi ezahlukeneyo zokuqulunqa iifom.
(2) Imisebenzi ephambili ye-HPMC kwiipeyinti kunye neengubo
1. Ukutyeba
Kwipeyinti kunye neengqungquthela zokugquma, i-HPMC, njengenye yezona zinto ziphambili, inceda ukulungelelanisa i-rheology (oko kukuthi, i-fluidity kunye nokukhubazeka) kwengubo ngokuguqula i-viscosity yayo. Iimpawu ezilungileyo ze-rheological zinokuthintela ukugquma ekuzinziseni ngexesha lokugcinwa kunye nokugcina ulwelo olufanelekileyo kunye nokusebenza kwengubo ngexesha lokwakha.
Isiphumo sokuqina sineempembelelo ezahlukeneyo kwiintlobo ezahlukeneyo zeengubo. Kwiingubo ezisekelwe emanzini, i-HPMC ikwandisa i-viscosity ye-coating, eyenza kube lula ukuyisebenzisa kunye nokusabalalisa ngokulinganayo phezu komhlaba, ukuphepha ukugoba. Kwiingubo ezisekwe kwi-solvent, i-HPMC ikwanceda ukulungelelanisa i-viscosity kunye nokubonelela nge-thixotropy efanelekileyo (i-coating iyajiya xa ishiywe imile kwaye ibhityile xa ishukunyiswa okanye ifakwe).
2. I-arhente yokugcina amanzi
Isiphumo sokugcina amanzi se-HPMC sibaluleke kakhulu, ngakumbi kwiipeyinti ezisekelwe emanzini. Inokuthintela ngokufanelekileyo amanzi epeyinti ukuba aphephe ngokukhawuleza ngexesha lenkqubo yokwakha, ngaloo ndlela eqinisekisa ukuba i-coating inexesha elaneleyo lokulinganisa kunye nokwenza ifilimu egudileyo kunye nefanayo. Ngaphantsi kweemeko zokushisa ezomileyo okanye eziphezulu, ukukhuphuka kwamanzi kwipeyinti ngokukhawuleza kunokubangela ukuqhekeka kwefilimu yokugqoka okanye indawo engalinganiyo. I-HPMC inokucothisa kakhulu le nkqubo.
I-HPMC inokunceda kwakhona i-pigments kunye ne-fillers kwipeyinti ukuba ihlale isasazwe ngokulinganayo ngexesha lenkqubo yokwakha, ukuthintela ukomisa kwendawo okanye i-particle agglomeration, ngaloo ndlela iqinisekisa ubuhle kunye nokufana kwefilimu yokugquma.
3. I-ejenti yokulinganisa kunye ne-anti-sagging effect
Njenge-arhente yokulinganisa, i-HPMC inokuthintela ipeyinti ukuba ingagugi okanye igxumeke ngexesha lenkqubo yokomisa ipeyinti. Ngenxa yeempawu zayo ezikhethekileyo ze-rheological, i-HPMC inokubonelela nge-fluidity elungileyo ngexesha lokwakhiwa kokugquma, ivumela ipeyinti ukuba isasazeke ngokulinganayo kumphezulu we-substrate. Emva kokuyeka ukusebenza, i-viscosity yepeyinti ibuyela ngokuthe ngcembe ukukhusela ukuhamba okugqithisileyo kunye nokwakheka kwamanqaku ahlayo.
Olu phawu lubaluleke kakhulu kwipeyinti ye-facade okanye ezinye izihlandlo apho kufuneka usetyenziso oluthe nkqo. Ukongezwa kwe-HPMC kuqinisekisa ukuba ipeyinti ifumana ngokukhawuleza ukuhambelana okufanelekileyo emva kokusetyenziswa, ukwenzela ukuba ihlale phezu kwendawo esetyenziswe kuyo, kwaye ayiqhubeki phantsi ngenxa yobunzima.
4. Isiphumo sokusasazeka
I-HPMC, njenge-dispersant, inokuphucula i-dispersibility ye-pigments kunye ne-fillers kwipeyinti. Ngokuphucula i-dispersibility of pigments and fillers, i-HPMC inokuqinisekisa ukuba iinqununu eziqinileyo kwipeyinti zihlala zihlakazekile kakuhle, zigweme i-agglomeration kunye ne-sedimentation, kwaye ngaloo ndlela iphucula ukufana kunye nokuzinza kwengubo. Oku kubalulekile ukuhambelana kombala kunye neempawu zomatshini zokugquma.
5. Uncedo lokwenza ifilimu
Ngexesha lenkqubo yokwenza ifilimu yepeyinti, i-HPMC inokusetyenziswa njengoncedo lokwenza ifilimu ukunceda ukwenza i-coating efanayo. Olu phawu lubalulekile ekuphuculeni umgangatho womphezulu wokwaleka. Ngexesha lenkqubo yokomisa, i-HPMC iqinisekisa ukuba ipeyinti inokoma ngokulinganayo kumphezulu nangaphakathi ngokulungelelanisa izinga lokunyuka kwamanzi, yenze i-flat and smooth coating. Ngokukodwa kwiipeyinti ezicwebezelayo kunye nepeyinti yokuhlobisa, indima ye-HPMC yenza ukuba iingubo zibe nembonakalo engcono.
(3) Izinto ezilungileyo zokusebenzisa i-HPMC
1. Ukuphucula ukusebenza kokwakhiwa kwengubo
I-rheological regulation effect ye-HPMC yenza i-coating isebenze lula ngexesha lokufaka isicelo, kwaye ukusebenza kokwakhiwa kuphuculwe kakhulu. Ukugquma akuyi kuhamba ngokugqithiseleyo okanye ukuvelisa amanqaku e-brush, i-coating ifana kakhulu, kwaye ifilimu yokugqoka eyenziwe emva kokwakhiwa ilula kwaye ilula.
2. Ukuphucula ukuzinza kokugcinwa kwengubo
I-HPMC inokuthintela i-stratification kunye ne-sedimentation ye-coating ngexesha lokugcina, kwaye igcine ukufana kunye nokuzinza kwengubo. Ukuqiniswa kwayo kunye nemiphumo yokusabalalisa kunokugcina ngokufanelekileyo ii-pigments kunye nezigcwalisi kwi-coating kwisimo esisasazeka ngokufanayo, ukwandisa ubomi bokugcinwa kwengubo.
3. Ukuphucula ukusebenza kwe-anti-cracking yefilimu yokugqoka
Isiphumo sokugcinwa kwamanzi kwe-HPMC siqinisekisa ukuba amanzi afakwe kwi-coating anokuthi aphephe ngokukhawuleza ngexesha lokumisa, kwaye ifilimu yokugqoka ayiyi kuqhekeka ngenxa yokumisa ngokukhawuleza xa isenziwa, ngaloo ndlela iphucula umgangatho kunye nokuqina kwefilimu yokugqoka.
4. Ukuziqhelanisa neemeko ezahlukeneyo zokusingqongileyo
Ekubeni i-HPMC inamandla okuziqhelanisa nokutshintsha kweqondo lobushushu kunye nokufuma, ilungele ulwakhiwo lokwaleka phantsi kweemeko ezahlukeneyo zokusingqongileyo, ngakumbi kubushushu obuphezulu kunye nokufuma okuphantsi. I-HPMC inokuphucula ngokufanelekileyo ukugcinwa kwamanzi kwengubo kwaye ithintele ukugquma ukuba kome ngokukhawuleza.
(4) Ukusetyenziswa kwe-HPMC kwiintlobo ezahlukeneyo zeengubo
Iingubo ezisekelwe emanzini: I-HPMC isetyenziselwa ukuqina, ukugcinwa kwamanzi kunye nokulungelelaniswa komgangatho kwiingubo ezisekelwe emanzini. Inokuphucula ukusebenza kokwakhiwa kweengubo ezisekelwe kumanzi, ngakumbi xa isetyenziswe kwindawo yokumisa ngokukhawuleza, inokuphucula kakhulu umthamo wokugcinwa kwamanzi okugubungela.
Iingubo zoKwakha: Kwiingubo zokwakha, i-HPMC iqinisekisa ukukhuselwa kwexesha elide eludongeni okanye kwizakhiwo zesakhiwo ngokunyusa ukuxhathisa kokuqhekeka kunye nokuqina kwengubo. Iingubo zezakhiwo zihlala zifuna ukusebenza okuphezulu kolwakhiwo kunye nokumelana nemozulu, kwaye i-HPMC inokunceda ukuphucula ezi zakhiwo.
Iingubo ezicwebezelayo eziphakamileyo: Iingubo ezikhazimlayo eziphakamileyo zineemfuno eziphezulu zokukhanya komphezulu kunye nokuguda. Impembelelo yokulinganisa kunye nepropathi yokwenza ifilimu ye-HPMC inokuphucula kakhulu umgangatho wokubonakala kwengubo, iyenze ikhanye kwaye ilula.
I-HPMC idlala iindima ezininzi kwiipeyinti kunye neengubo, kubandakanywa ukutyeba, ukugcinwa kwamanzi, ukulinganisa, ukusabalalisa kunye nokwakhiwa kwefilimu. Akunakuphucula kuphela ukusebenza kokwakhiwa kwengubo, kodwa nokuphucula umgangatho kunye nokuqina kwefilimu yokugqoka. Ngoko ke, i-HPMC isetyenziswa ngokubanzi kwiindlela zokwaleka zanamhlanje kwaye iyongezelelo ebalulekileyo yokuqinisekisa ukusebenza kunye nomgangatho weengubo.
Ixesha lokuposa: Oct-11-2024