Izicelo ze-HPMC kwiingubo zamashishini kunye neepeyinti

I-Hydroxypropyl methylcellulose (HPMC) yi-ether ye-cellulose e-soluble engekho i-ionic esetyenziswa kakhulu kwizinto zokwakha, amayeza, ukutya, iimveliso zokunyamekela kunye neengubo. Kwizinto zokuhombisa zamashishini kunye neepeyinti, i-HPMC iye yaba sisongezo esibalulekileyo ngenxa yeempawu zayo ezizodwa kunye neekhemikhali. Umsebenzi wayo oyintloko kukusebenza njenge-thickener, i-stabilizer, i-agent-forming agent kunye ne-rheology yokulawula i-rheology ukuze kuphuculwe ukusebenza, ukuzinza kokugcinwa kunye nomgangatho wokugquma kweengubo kunye neepende.

1. Iimpawu ezisisiseko ze-HPMC

I-HPMC yikhompawundi efunyenwe ngokuguqula iikhemikhali zeselulosi yendalo. Inezi mpawu zilandelayo zomzimba kunye neekhemikhali, eziyenza isetyenziswe ngokubanzi kwiingubo zemizi-mveliso kunye neepeyinti:

Ukunyibilika kwamanzi: I-HPMC inokunyibilika kakuhle emanzini abandayo, isenza isisombululo se-viscous esicacileyo esinceda ukuphucula i-viscosity yepeyinti.

I-Thermal gelability: Kwiqondo elithile lobushushu, i-HPMC iya kwenza ijeli kwaye ibuyele kwisimo sesisombululo emva kokupholisa. Olu phawu luvumela ukuba lunikeze ukusebenza okungcono kokugquma phantsi kweemeko ezithile zokwakha.

Iipropati ezintle zokwenza ifilimu: I-HPMC inokwenza ifilimu eqhubekayo xa ipeyinti yomile, iphucula ukubambelela kunye nokuqina kwengubo.

Ukuzinza: Inokumelana okuphezulu kwi-acids, iziseko kunye ne-electrolytes, iqinisekisa ukuzinza kwengubo phantsi kweemeko ezahlukeneyo zokugcina kunye nokusetyenziswa.

2. Imisebenzi ephambili ye-HPMC kwiingubo zamashishini kunye neepeyinti

2.1 Ukuqina

Kwiingubo zamashishini, isiphumo sokuqina kwe-HPMC sibaluleke kakhulu. Isisombululo sayo sine-viscosity ephezulu kunye neempawu ezintle zokucheba, oko kukuthi, ngexesha lokuvuselela okanye ukupeyinta, i-viscosity iya kuncipha okwexeshana, ngaloo ndlela iququzelele ukwakhiwa kwepeyinti, kwaye i-viscosity iya kubuya ngokukhawuleza emva kokuba ukwakhiwa kumisiwe ukukhusela ipeyinti. ukusuka ekutyhafeni. Le propathi iqinisekisa nokuba isicelo sokugquma kwaye sinciphisa ukuthoba.

2.2 Ulawulo lwe-Rheology

I-HPMC inefuthe elibonakalayo kwi-rheology yokwaleka. Igcina i-viscosity efanelekileyo yeengubo ngexesha lokugcinwa kwaye inqande ukugquma ukutshatyalaliswa okanye ukuhlalisa. Ngexesha lokufaka isicelo, i-HPMC ibonelela ngeempawu ezifanelekileyo zokulinganisa ukunceda ipeyinti isasazeke ngokulinganayo kumphezulu wesicelo kwaye yenze i-coating egudileyo. Ukongezelela, iipropati zayo zokunciphisa i-shear inokunciphisa amanqaku ebrashi okanye amanqaku e-roll avelisiweyo ngexesha lenkqubo yesicelo kunye nokuphucula umgangatho wokubonakala kwefilimu yokugqibela yokugqoka. 

2.3 I-arhente eyenza ifilimu

Iimpawu zokwenza ifilimu ye-HPMC inceda ukuphucula ukunamathela kunye namandla efilimu yeengubo. Ngexesha lenkqubo yokomisa, ifilimu eyenziwe yi-HPMC inokuqina okuhle kunye nokunwebeka, okunokuphucula ukuxhathisa kokuqhekeka kunye nokumelana nokunxitywa kwengubo, ngakumbi kwezinye izicelo ezifunwa kakhulu kwimizi-mveliso, njengeenqanawa, iimoto, njl., I-HPMC iipropati zokwenza ifilimu inokuphucula ngokufanelekileyo ukuqina kwengubo.

2.4 Isizinzi

Njenge-stabilizer, i-HPMC inokuthintela imvula yee-pigments, iifayili kunye nezinye iinqununu eziqinileyo kwi-coating formulations, ngaloo ndlela iphucula ukuzinza kokugcinwa kweengubo. Oku kubaluleke kakhulu kwiingubo ezisekelwe emanzini. I-HPMC inokuthintela i-delamination okanye i-agglomeration yeengubo ngexesha lokugcina kwaye iqinisekise ukuhambelana komgangatho wemveliso kwixesha elide lokugcina.

3. Ukusetyenziswa kwe-HPMC kwiingubo ezahlukeneyo

3.1 Iingubo ezisekelwe emanzini

Iingubo ezisekwe emanzini zifumene ingqwalasela enkulu kwiminyaka yakutshanje ngenxa yobuhlobo bazo bendalo kunye nokukhutshwa kwe-volatile organic compound (VOC). I-HPMC isetyenziswa ngokubanzi kwiingubo ezisekelwe emanzini. Njenge-thickener kunye ne-stabilizer, i-HPMC inokuphucula ngokufanelekileyo ukuzinza kokugcinwa kunye nokusebenza kweengubo ezisekelwe emanzini. Inika ulawulo lokuhamba okugqwesileyo kwiindawo eziphantsi okanye eziphezulu zobushushu, ukwenza ipeyinti ibe lula xa itshizwa, ibrashwa okanye iqengqeleke.

3.2 Ipeyinti yeLatex

Ipeyinti yeLatex yenye yezona zinto zisetyenziswa kakhulu kwiingubo zokwakha namhlanje. I-HPMC isetyenziswa njenge-arhente yokulawula i-rheology kunye ne-thickener kwipeyinti ye-latex, enokulungelelanisa i-viscosity yepeyinti ye-latex, ikhulise ukusasazeka kwayo, kwaye ithintele ifilimu yepeyinti ukuba ingagugi. Ukongeza, i-HPMC inefuthe elingcono lokulawula ukusasazwa kwepeyinti ye-latex kwaye inqanda amacandelo epeyinti ukuba angazinzi okanye ahlulwe ngexesha lokugcina.

3.3 Ipeyinti esekwe kwi-oyile

Nangona ukusetyenziswa kweoli esekwe kwi-oyile yehlile namhlanje kunye neemfuno ezingqongqo zokhuseleko lokusingqongileyo, zisasetyenziswa ngokubanzi kwezinye iindawo zemizi-mveliso, ezinje ngeentsimbi ezikhuselayo. I-HPMC isebenza njenge-arhente yokuxhoma kunye ne-rheology yokulawula i-rheology kwiingubo ezisekelwe kwi-oyile ukuthintela ukuhlaliswa kwe-pigment kunye nokunceda i-coating ibe nomgangatho ongcono kunye nokubambelela ngexesha lokufaka isicelo.

4. Ukusetyenziswa kunye nomthamo we-HPMC

Isixa se-HPMC esisetyenzisiweyo kwi-coatings idla ngokugqitywa luhlobo lwe-coating kunye neemfuno ezithile zesicelo. Ngokuqhelekileyo, isixa esongezelelweyo se-HPMC sihlala silawulwa phakathi kwe-0.1% kunye ne-0.5% yobunzima obupheleleyo besambatho. Indlela yokudibanisa ubukhulu becala idibanisa umgubo owomileyo okanye isisombululo esilungiselelwe kwangaphambili kwaye songezwa. I-solubility kunye ne-viscosity adjustment effect ye-HPMC ichaphazeleka bubushushu, umgangatho wamanzi kunye neemeko ezishukumisayo. Ngoko ke, indlela yokusetyenziswa kufuneka ilungiswe ngokwemiqathango yenkqubo yangempela.

I-Hydroxypropyl methylcellulose (HPMC) isetyenziswe njenge-thickener, i-rheology yokulawula i-agent, i-agent-forming agent kunye ne-stabilizer kwiingubo zoshishino kunye neepeyinti, ukuphucula kakhulu ukusebenza kokwakhiwa, ukuzinza kokugcinwa kunye nefilimu yokugqibela yokugqoka. umgangatho. Ngokukhuthazwa kokwaleka kokusingqongileyo kunye nokunyuka kwemfuno yemarike yeengubo eziphezulu zokusebenza, i-HPMC iya kuqhubeka idlala indima ebalulekileyo kwiingubo zamashishini ezizayo. Ngokusetyenziswa okunengqiqo kwe-HPMC, iipropati zomzimba kunye neekhemikhali zokugquma zingaphuculwa ngokufanelekileyo, kwaye ukuqina kunye nefuthe lokuhombisa i-coating inokwandiswa.