Ukuhanjiswa kokukhanya kwe-hydroxypropyl methylcellulose kuchaphazeleka ikakhulu ngala manqaku alandelayo:
1. Umgangatho wemathiriyeli ekrwada.
Okwesibini, umphumo we-alkalization.
3. Umlinganiselo wenkqubo
4. Umlinganiselo wesinyibilikisi
5. Isiphumo sokungathathi hlangothi
Ezinye iimveliso zinamafu njengobisi emva kokuba zinyibilikile, ezinye zimhlophe qhwa, ezinye zityheli, kwaye ezinye zicacile kwaye ziyabonakala… Ukusombulula ingxaki, hlengahlengisa ukusuka kula manqaku alandelayo. Ngamanye amaxesha i-acetic acid inokuchaphazela kakhulu ukuhanjiswa kokukhanya. Kungcono ukusebenzisa i-acetic acid emva kokuhlanjululwa. Impembelelo enkulu kukuba ingaba i-reaction ivuselelwe ngokulinganayo kwaye ingaba umlinganiselo wenkqubo uzinzile (ezinye izinto zinomswakama kwaye umxholo awuzinzanga, njenge-solvent esetyenziselwa ukuphinda isetyenziswe). Enyanisweni, zininzi izinto ezichaphazelayo. Ukuba izixhobo zizinzile kwaye abaqhubi baqeqeshwe kakuhle, imveliso kufuneka izinzile kakhulu. Ukuhanjiswa kokukhanya akuyi kudlula uluhlu lwe-± 2%, kwaye ukuhambelana okufanayo kwamaqela athatha indawo kufuneka kulawulwe kakuhle. Endaweni yokufana, ukuhanjiswa kokukhanya ngokuqinisekileyo kuya kulungile.
Izinto ezichaphazela i-viscosity ye-hydroxypropyl methylcellulose:
I-high-viscosity hydroxypropyl methylcellulose ayikwazi ukuvelisa i-cellulose ephezulu kakhulu kuphela ngokufunxa kunye nokutshintshwa kwenitrogen kwimveliso. Ngokuqhelekileyo, ukuveliswa kwe-cellulose ephezulu ye-viscosity e-China ayikwazi ukulawulwa. Nangona kunjalo, ukuba isixhobo sokulinganisa i-oksijeni sinokufakwa kwi-kettle, ukuveliswa kwe-viscosity yayo kunokulawulwa ngokufanelekileyo.
yenziwe. Ukongeza, ukuqwalasela isantya endaweni ye-nitrogen, kulula ukuvelisa iimveliso eziphezulu ze-viscosity kungakhathaliseki ukuba le nkqubo ingenamoya kangakanani. Ewe kunjalo, inqanaba lepolymerization yomqhaphu osulungekileyo likwabalulekile. Ukuba oko akusebenzi, yenza oko kunye ne-hydrophobic association. Kukho iiarhente zombutho kule ndawo eTshayina. Uhlobo luni lwe-arhente yonxulumano olukhethiweyo olunempembelelo enkulu ekusebenzeni kwemveliso yokugqibela. I-oksijeni eseleyo kwi-reactor ibangela ukuthotywa kwe-cellulose kunye nokuncipha kwesisindo se-molecular, kodwa i-oksijini eseleyo iyancipha, nje ukuba iamolekyu eziphukileyo zixhunywe kwakhona, akunzima ukwenza i-viscosity ephezulu. Nangona kunjalo, izinga lokuzalisa linento eninzi yokwenza nomxholo we-hydroxypropyl. Ezinye iifektri zifuna kuphela ukunciphisa iindleko kunye nexabiso, kodwa azifuni ukwandisa umxholo we-hydroxypropyl, ngoko umgangatho awukwazi ukufikelela kwinqanaba leemveliso zangaphandle ezifanayo. Izinga lokugcinwa kwamanzi kwimveliso inobudlelwane obukhulu kunye ne-hydroxypropyl, kodwa iphinda inqume izinga lokugcinwa kwamanzi, umphumo we-alkalization, umlinganiselo we-methyl chloride kunye ne-propylene oxide, i-alkali concentration kunye nesantya sokugcinwa kwamanzi kuyo yonke inkqubo yokuphendula. Umlinganiselo kwikotoni ecocekileyo inquma ukusebenza kwemveliso.
Ixesha lokuposa: Mar-29-2023