Ngaba i-hydroxypropyl methylcellulose iyingozi emzimbeni womntu?

I-hydroxypropyl methylcelluloseyi-cellulose ether yendalo, engenabungozi emzimbeni womntu. Nangona kunjalo, izinto ezisetyenziswa kwi-cotton linters kunye ne-HPMC ezisetyenziswa kumzi-mveliso zifana nazo zonke, kuba oku kuya kuba nefuthe lothuli, kwaye ezinye azinabungozi.

I-Hydroxypropyl methylcellulose ayinabungozi. I-Cellulose ithathwa njengefanelekileyo kwaye icutshungulwa ngokusebenzisa iifayibha ezivela ngokwemvelo ngokusebenzisa i-alkali fusion, i-grafting response, i-washing, i-stomash, i-grinding nezinye iinkqubo. Ayiyi kubeka impilo yabantu esichengeni.

I-Hydroxypropyl methyl cellulose, eyaziwa ngokuba yi-hypromellose kunye ne-cellulose hydroxypropyl methyl ether, yenziwa ngokusebenzisa i-cotton cellulose ecocekileyo kakhulu njengezinto eziluhlaza kwaye ifumana i-etherification ekhethekileyo phantsi kweemeko ze-alkaline.

Ukwenziwa kwe-hydroxypropyl methylcellulose: i-cotton cellulose ecociweyo iphathwa nge-lye kwi-35-40℃ kangangesiqingatha seyure, icinezelwe, i-cellulose iyacolwa, kwaye ukuguga kwenziwa kwi-35℃ ukwenza i-alkali fiber efunyenweyo i-polymeri ngokulinganayo. Ngaphakathi koluhlu olufunekayo. Faka i-alkali fiber kwi-kettle ye-etherification, yongeza i-propylene oxide kunye ne-methyl chloride ngokulandelelana, kwaye i-etherify kwi-50-80℃ kangangeeyure ezi-5, kwaye uxinzelelo oluphezulu lumalunga ne-1.8MPa. Emva koko yongeza ubungakanani obufanelekileyo be-hydrochloric acid kunye ne-oxalic acid ukuhlamba izinto emanzini ashushu kwi-90°C ukwandisa ubungakanani kunye nomthamo. Khipha amanzi nge-centrifugation. Hlamba ukuya kungathathi hlangothi. Xa umxholo wamanzi kwizinto ungaphantsi kwe-60%, yomise ngomoya oshushu kwi-130°C ukuya kumxholo ongaphantsi kwe-5%.

I-HPMC eveliswa yindlela yokunyibilikisa isebenzisa i-toluene kunye ne-isopropanol njengesinyibilikisi. Ukuba ihlanjwe kakubi kakhulu, iya kuba nevumba elincinci eliseleyo. Le yingxaki yenkqubo yokuhlamba, engachaphazeli ukusetyenziswa kwayo okanye nayiphi na ingxaki.

IHypromellose yikotoni ecociweyo engafane ifunxwe lulwelo ukuze ifumane i-alkaline cellulose, ize emva koko ithathe inxaxheba kwizinyibilikisi, ii-etherification agents, i-toluene kunye ne-isopropanol kwi-etherification reactions, kwaye iyasuswa, ihlanjwe, yomiswe, kwaye ityunyuzwe ukuze kufunyanwe iimveliso ezigqityiweyo. Imbi kakhulu kwaye inevumba elimnandi, ngoko ke abasebenzisi banokuyisebenzisa kwimeko ezinzileyo.

I-hydroxypropyl methylcellulose kufuneka inike ingqalelo kwezi zinto zilandelayo kwisicelo:

Kwimpembelelo yomgubo wodaka, i-hydroxypropyl methylcellulose idlala kuphela impembelelo exhasayo, kwaye ayithathi nxaxheba kuyo nayiphi na impembelelo yamakhemikhali. Umgubo wodaka wongezwa ngamanzi uze ubekwe eludongeni, nto leyo ebangelwa yimpendulo yamakhemikhali. Ngenxa yokwenziwa kwezinto ezintsha, umgubo wodaka eludongeni uyasuswa eludongeni uze ucolwe ube ngumgubo ukuze kwenziwe izinto ezintsha. I-Hydroxypropyl methylcellulose igcina amanzi kuphela kwaye inceda i-gray calcium ukuba ibe nempendulo engcono, kodwa ayithathi nxaxheba kuyo nayiphi na impendulo.

I-Hydroxypropyl Methyl Cellulose I-HPMC ayithathi nxaxheba kuyo nayiphi na i-chemical reaction, kodwa inceda kuphela. Yongeza amanzi kumgubo wodaka uze uwubeke eludongeni, yi-chemical reaction. Ngenxa yokwenziwa kwezinto ezintsha, umgubo wodaka eludongeni uyasuswa eludongeni uze ucolwe ube ngumgubo, emva koko akunakwenzeka, kuba izinto ezintsha zenziwe i-NS. Izinto eziphambili ze-gray calcium powder zezi: Ca(OH)2, umxube we-CaO kunye ne-CaCO3 encinci, i-CaO3.

H2O=Ca（OH）2-Ca（OH）2 CO2=CaCO3↓ H2O

I-gray calcium ivelisa ezinye izinto phantsi kwefuthe lamanzi kunye ne-CO2 emoyeni, ngelixa i-HPMC igcina amanzi kuphela kwaye inceda i-gray calcium ukuba ibe nempendulo engcono. Ayithathi nxaxheba kuyo nayiphi na impendulo.

I-Hydroxypropyl methyl cellulose inokusetyenziswa okubanzi. Kubomi bemihla ngemihla, iimveliso ezininzi azinakwahlulwa kwinkqubo yokwenziwa. Emva koko, kumashishini ahlukeneyo, yintoni impembelelo ye-hydroxypropyl methylcellulose, ndiza kukuchazela yona, ukuze ukwazi ukuthintela ukusetyenziswa kwayo kakubi ngelixa ufumana ulwazi.

Okokuqala, kwishishini lokwakha, ingathathwa njengesixhobo sokurhoxisa kunye nesokugcina amanzi. I-mortar mortar iyampompa, ngoko ke yonke i-mortar eyomileyo esiyisebenzisayo inenxaxheba yayo. Ukongeza, kwizixhobo zokwakha ezifana ne-gypsum eluhlaza, i-plaster, kunye ne-mud powder, ingasetyenziswa njenge-binder, engagcini nje ngokwandisa ixesha lokusebenza, kodwa ikwayenza ipeyinti ibe lula ukuyigquma. Kwimabula, iithayile ze-ceramic ezinamathelayo, imihombiso yeplastiki ehlanganisiweyo ye-molecular, ingasetyenziswa njengesithambisi sokunamathela, njl. Kunokuthiwa i-hydroxypropyl methyl cellulose yeyona idumileyo ngokuguquguquka kwayo kwizixhobo zokwakha.

Kwamanye amashishini, anje ngokwenziwa kweporcelain kunye neembiza, ingasetyenziswa njengesincamathelisi sokwenza iimveliso zeporcelain kunye neemveliso zeembiza; kushishino lwelacquer kunye nokuprinta i-inki, ingasetyenziswa njengomgubo okhululekileyo, isithambisi, isiqinisi, kwaye nokuba inokudityaniswa neSolvent yendalo okanye imixube yamanzi kakuhle, kwaye ingasetyenziswa njengesisusi sepeyinti ekwenzeni iiplastiki ze-molecular compound, kunye nezithambisi, ii-mold release agents, ii-lubricants, njl.njl.; ekwenzeni i-polyvinyl chloride, ithathwa njengomgubo okhululekileyo.

Iimveliso ezenziwe nge-hydroxypropyl methylcellulose zisetyenziswa kakhulu ekuvuseleleni iziqhamo nemifuno, amayeza, izikhumba zezilwanyana kunye nemizi-mveliso yelaphu. Ikhuselekile kwaye ayinatyhefu, ayicaphukisi kakhulu i-mucous membranes kunye nezikhumba zomzimba womntu, kwaye ingasetyenziswa njengesongezelelo sokutya. Nangona kunjalo, kwimeko yokwenyani, uthuli lwayo lunokubangela ungcoliseko lomoya, kwaye akuncedi ekugcinweni kolusu ukuluhlula emlilweni ukuze kuthintelwe ukuqhuma.

ukugcinwa kwamanzi

I-hydroxypropyl methylcellulose ekhethekileyo yokwakha ithintela ukusetyenziswa kwamanzi ngokugqithisileyo yi-substrate, kwaye amanzi kufuneka agcinwe kwi-plaster kangangoko kunokwenzeka ngexesha apho i-gypsum imiselwe ngokupheleleyo. Olu phawu lukhethekileyo lubizwa ngokuba kukugcinwa kwamanzi kwaye luhambelana ngokuthe ngqo ne-viscosity yesisombululo se-hydroxypropyl methylcellulose esisetyenziselwa ukwakha kwi-plaster. Okukhona i-viscosity yesisombululo iphezulu, kokukhona amava okugcinwa kwamanzi aphezulu.

Ukungagugi

I-mortar eneempawu ezikhethekileyo zokulwa nokugoba ingafakwa ngengubo etyebileyo ngaphandle kokugoba, nto leyo ethetha ukuba i-mortar ngokwayo ayitshintshi isini sayo, kungenjalo iya kutyibilika phantsi xa ulwakhiwo luqala.

Nciphisa uburhabaxa kwaye wenze kube lula ukwakhiwa

Emva kokongeza iimveliso ezahlukeneyo ze-hydroxypropyl methylcellulose ezakhiweyo, iplasta eluhlaza ye-gypsum enesimo esithambileyo ingaveliswa. Xa ibonwa ifanelekile kwaye kusetyenziswa i-hydroxypropyl methylcellulose ekumgangatho ophantsi we-hydroxypropyl methylcellulose ezakhiweyo, inqanaba le-viscosity liyancitshiswa kwaye ukwakhiwa kuba lula. Nangona kunjalo, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose ekwakheni okuthambileyo kubuthathaka, kwaye kuyimfuneko ukwandisa inani lokongeza.

Izinga lokuhambelana kweplastiki

Kwisixa esimiselweyo se-mortar eyomileyo, kungcono ukuvelisa i-mortar emanzi kakhulu, enokufezekiswa ngokongeza amanzi amancinci kunye namaqamza. Nangona kunjalo, ukuba isixa samanzi kunye namaqamza made kakhulu, amandla ayancitshiswa.