Ukuhanjiswa kokukhanya kwe-hydroxypropyl methylcellulose kuchaphazeleka kakhulu ngala manqaku alandelayo:
1. Umgangatho wezinto ezisetyenziswa ngokwemvelo.
Okwesibini, isiphumo se-alkaliization.
3. Umlinganiselo wenkqubo
4. Ubungakanani besinyibilikisi
5. Isiphumo sokungaguquguquki
Ezinye iimveliso zifana nobisi emva kokuba zinyibilikisiwe, ezinye zimhlophe njengobisi, ezinye zimthubi, kwaye ezinye zicacile kwaye zicacile… Ukusombulula ingxaki, lungisa ukusuka kula manqaku alandelayo. Ngamanye amaxesha i-acetic acid inokuchaphazela kakhulu ukuhanjiswa kokukhanya. Kungcono ukusebenzisa i-acetic acid emva kokuxuba. Eyona mpembelelo inkulu kukuba ingaba impendulo ixutywe ngokulinganayo na kwaye ingaba umlinganiselo wenkqubo uzinzile (ezinye izinto zinomswakama kwaye umxholo awuzinzile, njenge-solvent esetyenziselwa ukuphinda isetyenziswe). Enyanisweni, kukho izinto ezininzi ezichaphazelayo. Ukuba izixhobo zizinzile kwaye abaqhubi baqeqeshwe kakuhle, imveliso kufuneka izinzile kakhulu. Ukuhanjiswa kokukhanya akuyi kudlula uluhlu lwe-±2%, kwaye ukufana kokutshintshwa kwamaqela atshintshayo kufuneka kulawulwe kakuhle. Endaweni yokufana, ukuhanjiswa kokukhanya ngokuqinisekileyo kuya kulungile.
Izinto Ezichaphazela Ukuxinana kweHydroxypropyl Methyl Cellulose
I-hydroxypropyl methylcellulose ene-viscosity ephezulu ayinakuvelisa i-cellulose ephezulu kakhulu kuphela ngokuyitshiza nge-vacuum kunye nokutshintshwa kwe-nitrogen kwimveliso. Ngokubanzi, ukuveliswa kwe-cellulose ene-viscosity ephezulu eTshayina akunakulawulwa. Nangona kunjalo, ukuba isixhobo sokulinganisa i-oxygen encinci singafakwa kwiketile, ukuveliswa kwe-viscosity yayo kunokulawulwa ngokwenziwa.
yenziwe. Ukongeza, xa ucinga ngesantya sokutshintshwa kwe-nitrogen, kulula ukuvelisa iimveliso ezinobungqingili obuphezulu nokuba inkqubo ingena moya kangakanani na. Kakade ke, inqanaba lokwenziwa kwe-polymerization yekotoni ecociweyo nalo libalulekile. Ukuba oko akusebenzanga, kwenze ngokudibanisa i-hydrophobic. Kukho ii-arhente zokudibanisa kule ndawo eTshayina. Uhlobo lwe-arhente yokudibanisa omawuyikhethe inefuthe elikhulu ekusebenzeni kwemveliso yokugqibela. Ioksijini eseleyo kwi-reactor ibangela ukuwohloka kwe-cellulose kunye nokwehla kobunzima be-molecular, kodwa ioksijini eseleyo ilinganiselwe, logama nje iimolekyuli eziphukileyo ziphinde zaxhunyaniswa, akunzima ukwenza i-viscosity ephezulu. Nangona kunjalo, isantya sokugcwala sinento yokwenza kakhulu nomxholo we-hydroxypropyl. Ezinye iifektri zifuna ukunciphisa ixabiso kunye nexabiso kuphela, kodwa azifuni ukwandisa umxholo we-hydroxypropyl, ngoko umgangatho awunakufikelela kwinqanaba leemveliso ezifanayo zangaphandle. Isantya sokugcina amanzi semveliso sinobudlelwane obuhle ne-hydroxypropyl, kodwa kuyo yonke inkqubo yokusabela, ikwamisela isantya sayo sokugcina amanzi, isiphumo se-alkaliization, umlinganiselo we-methyl chloride kunye ne-propylene oxide, uxinzelelo lwe-alkali kunye nokugcinwa kwamanzi. Umlinganiselo wekotoni ecociweyo umisela ukusebenza kwemveliso.
Ixesha lokuthumela: Meyi-23-2023