IHydroxypropyl methylcelluloseyi-cellulose ether eyenzeka ngokwemvelo, engeyongozi kumzimba womntu. Nangona kunjalo, izinto eziluhlaza ze-cotton linters kunye ne-HPMC ezisetyenziswe kwifektri zijongene nazo zonke, kuba oku kuya kuba nefuthe lothuli, kwaye abanye abayingozi.
IHydroxypropyl methylcellulose ayinayo ityhefu. I-Cellulose ithathwa njengefanelekileyo kwaye icutshungulwa ngokusebenzisa iifayili zendalo ngokuxutywa kwe-alkali, ukuphendula ngokuxutywa, ukuhlamba, ukomisa, ukugaya kunye nezinye iinkqubo. Ayizokubeka engozini impilo yabantu.
IHydroxypropyl methyl cellulose, ekwaziwa ngokuba yihypromellose kunye necellulose hydroxypropyl methyl ether, yenziwa ngokusebenzisa icotton cellulose esulungekileyo kakhulu njengesixhobo ekrwada kwaye ifumana i-etherification ekhethekileyo phantsi kweemeko zealkaline.
I-synthesis ye-hydroxypropyl methylcellulose: i-cotton cellulose ecocekileyo iphathwa nge-lye kwi-35-40 ℃ isiqingatha seyure, icinezelwe, i-cellulose iyatyunyuzwa, kwaye ukuguga kuqhutyelwa kwi-35℃ ukwenza i-alkali fiber efunyenweyo ipholymerized. 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 ℃ ye-5h, kunye noxinzelelo oluphezulu malunga ne-1.8MPa. Emva koko faka inani elifanelekileyo le-hydrochloric acid kunye ne-oxalic acid ukuhlamba izixhobo emanzini atshisayo kwi-90 ° C ukwandisa ubungakanani kunye nomthamo. Dehydrate nge centrifugation. Swash ukuya kokungathathi hlangothi. Xa umxholo wamanzi kwizinto eziphathekayo ungaphantsi kwama-60%, uyomise ngomjelo womoya oshushu kwi-130 ° C ukuya kumxholo ongaphantsi kwe-5%.
I-HPMC eveliswa yindlela yokunyibilikisa isebenzisa i-toluene kunye ne-isopropanol njenge-solvent. Ukuba ihlanjwe kakubi kakhulu, iya kuba nevumba elincinci eliseleyo. Le yingxaki yenkqubo yokuhlamba, engachaphazeli ukusetyenziswa okanye nayiphi na ingxaki.
I-Hypromellose yikotoni esulungekileyo engaqhelekanga ukuba ifakwe ngolwelo ukufumana i-alkaline cellulose, kwaye emva koko ithatha inxaxheba kwi-solvents, i-etherification agents, i-toluene kunye ne-isopropanol ukwenzela ukusabela kwe-etherification, kwaye ingathathi hlangothi, ihlanjwe, yomiswe, kwaye icolile ukufumana iimveliso ezigqityiweyo. Imbi kakhulu kwaye iyanuka, ngoko abasebenzisi banokuyisebenzisa kwimo ezinzileyo.
IHydroxypropyl methylcellulose kufuneka ithathele ingqalelo ezi zinto zilandelayo kwisicelo:
Kwimpembelelo yodaka lodaka, i-hydroxypropyl methylcellulose idlala kuphela umphumo oxhasayo, kwaye ayithathi nxaxheba kuyo nayiphi na i-chemical reaction. I-powder yodaka yongezwa ngamanzi kwaye ibekwe eludongeni, okuyi-chemical reaction. Ngenxa yokubunjwa kwezinto ezintsha, umgubo wodaka eludongeni uyasuswa eludongeni kwaye ucolwe ube ngumgubo ukwenza izinto ezintsha. I-Hydroxypropyl methylcellulose igcina amanzi kuphela kwaye inceda i-gray calcium ibe nempendulo engcono, kodwa ayithathi nxaxheba kuyo nayiphi na impendulo.
I-Hydroxypropyl Methyl Cellulose HPMC ayithathi nxaxheba kuyo nayiphi na i-chemical reaction, kodwa inceda kuphela. Yongeza amanzi kumgubo wodaka kwaye uyibeke eludongeni, yi-chemical reaction. Ngenxa yokubunjwa kwezinto ezintsha, umgubo wodaka eludongeni ususwe eludongeni kwaye ugaywe ube ngumgubo, kwaye ke akunakwenzeka, kuba izinto ezintsha zenziwe i-NS. Amacandelo aphambili e-gray calcium powder zezi: Ca (OH) 2, umxube we-CaO kunye nenani elincinci le-CaCO3, i-CaO
H2O=Ca(OH)2-Ca(OH)2 CO2=CaCO3↓ H2O
I-calcium engwevu ivelisa ezinye izinto phantsi kwefuthe lamanzi kunye ne-CO2 emoyeni, ngelixa i-HPMC igcina amanzi kuphela kwaye inceda i-calcium engwevu ukuba ibe nempendulo engcono. Ayithathi nxaxheba kuyo nayiphi na impendulo.
IHydroxypropyl methyl cellulose inoluhlu olubanzi losetyenziso. Ubomi bemihla ngemihla, iimveliso ezininzi azikwazi ukwahlula kwinkqubo yokuvelisa. Emva koko, kumashishini ahlukeneyo, yintoni umphumo we-hydroxypropyl methylcellulose, ndiya kukuchazela, ukwenzela ukuba unokuthintela ukusetyenziswa kakubi ngelixa ufumana ulwazi.
Okokuqala, kwishishini lokwakha, linokuthathwa njenge-retarder kunye ne-arhente yokugcina amanzi. Udaka lodaka luyampompa, ngoko ke lonke udaka olomileyo esilusebenzisayo lunenxaxheba yalo. Ukongeza, kwizinto zokwakha ezifana negypsum eluhlaza, i-plaster, kunye nodaka lodaka, inokusetyenziswa njenge-binder, engagcini nje ixesha lokusebenza, kodwa yenza ipeyinti iqhume ngakumbi. Kwi-marble, i-adhesive ceramic tiles, i-molecular compounds imihlobiso yeplastiki, inokusetyenziswa njengento yokunyusa i-adhesion, njl.
Kwamanye amashishini, afana ne-porcelain kunye nemveliso yobumba, inokusetyenziswa njengento yokuncamathelisa ukuveliswa kwemveliso yeporcelain kunye neengqayi; kwishishini lelacquer kunye noshicilelo lwe-inki, ingasetyenziswa njengomgubo okhululekileyo, utyebe, uzinziso, kwaye nangenxa yokuba inokudityaniswa ne-Solvent yendalo okanye imixube yamanzi ngobuhle, kwaye ingasetyenziswa njengesisusa ipeyinti ekwenzeni iiplastiki zekhompawundi zemolekyuli. , kunye nee-softeners, ii-agent zokukhulula i-mold, i-lubricants, njl.; ekwenzeni i-polyvinyl chloride, ithathwa njengomgubo okhululekileyo.
Iimveliso ezenziwe nge-hydroxypropyl methylcellulose zisetyenziswa kakhulu kubutsha beziqhamo kunye nemifuno, amayeza, izikhumba zezilwanyana kunye nemizi-mveliso yelaphu. Ikhuselekile kwaye ayinayo ityhefu, ayicaphukisi kakhulu imifinya kunye nolusu lomzimba womntu, kwaye inokusetyenziswa njengesongezo sokutya. Nangona kunjalo, kwimeko yokwenyani yomcimbi, uthuli lwayo lunokubangela ukungcoliswa komoya, kwaye akunanzuzo ekugcinweni kwesikhumba ukuhlukanisa nomlilo ukuphepha ukuqhuma.
ukugcinwa kwamanzi
I-hydroxypropyl methylcellulose ekhethekileyo yokwakha igwema ukusetyenziswa kwamanzi ngokugqithiseleyo nge-substrate, kwaye amanzi kufuneka agcinwe kwi-plaster kangangoko kunokwenzeka ngexesha apho i-gypsum ifakwe ngokupheleleyo. Le propati ekhethekileyo ibizwa ngokuba ngukugcinwa kwamanzi kwaye ihambelana ngokuthe ngqo kwi-viscosity yesisombululo se-hydroxypropyl methylcellulose esetyenziselwa ukwakhiwa kwi-plaster. Ukuphakama kwe-viscosity yesisombululo, aphezulu amava okugcinwa kwamanzi.
Ukuchasana nokudodobala
Udaka oluneempawu ezikhethekileyo ze-anti-sagging zingasetyenziswa nge-coating ebanzi ngaphandle kokugubha, oku kuthetha ukuba umdaka ngokwawo awutshintshi ubulili bawo, ngaphandle koko uya kutyibilika xa ukwakhiwa kuqala.
Ukunciphisa i-viscosity kunye nokuququzelela ukwakhiwa
Emva kokongeza iimveliso ezahlukeneyo ze-hydroxypropyl methylcellulose kulwakhiwo, udaka lwegypsum eluhlaza kunye nesimo sengqondo esithambileyo sinokuveliswa. Xa kuthathwa njengefanelekileyo kwaye ibakala elisezantsi le-viscosity ye-hydroxypropyl methylcellulose yokwakha isetyenzisiweyo, i-degree of viscosity iyancipha kwaye ukwakhiwa kuba lula. Nangona kunjalo, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose yokwakhiwa kwe-viscosity ephantsi kubuthathaka, kwaye kuyimfuneko ukwandisa inani lokongezwa.
Izinga lokuhambelana kweplastiki
Ngomlinganiselo omiselweyo wodaka olomileyo, lunoqoqosho ngakumbi ukuvelisa ubungakanani bodaka olumanzi oluphezulu, olunokuthi luphunyezwe ngokudibanisa amanzi amancinci kunye namaqamza. Nangona kunjalo, ukuba inani lamanzi kunye namaqamza lide kakhulu, amandla aphazamisekile.
Ixesha lokuposa: Apr-26-2024