Guud ahaan, isku-darkahydroxypropyl methylcellulose, cellulose-ka suufka ah ee la safeeyey waxaa lagu daaweeyaa xal alkali ah 35-40°C nus saac, ka dib marka la cadaadiyo, cellulose-ka waa la shiidi doonaa, oo si habboon loogu da'in doonaa 35°C, si fiilooyinka alkali ee la helay ay u noqdaan kuwo celcelis ahaan la polymerized ah oo ku jira xadka loo baahan yahay. Faybarka alkali ku rid digsiga etherification, ku dar propylene oxide iyo methyl chloride markeeda, oo ku etherify 50-80 ℃ muddo 5 saacadood ah cadaadis sare oo ah qiyaastii 1.8 MPa. Kadib ku dar xaddi ku habboon oo ah hydrochloric acid iyo oxalic acid biyaha kulul 90 ° C si aad u dhaqdo walxaha si loo ballaariyo mugga. Ku qalaji centrifuge. Dhaq ilaa dhexdhexaad ah, marka biyaha ku jira maaddada ay ka yar yihiin 60%, ku qalaji hawo kulul oo ah 130°C ilaa wax ka yar 5%.
Alkalasaarid: Suufka budada ah ee la safeeyey ka dib marka la furo waxaa lagu daraa dareere aan firfircoonayn, waxaana lagu dhaqaajiyaa alkali iyo biyo jilicsan si uu u bararo shabagga kiristaalka ee suufka la safeeyey, kaas oo ku habboon gelinta molecules-ka wakiilka etherifying wuxuuna hagaajiyaa isku-dhafka falgalka etherification. Alkaliga loo isticmaalo alkalasaariddu waa hydroxide bir ah ama saldhig dabiici ah. Qadarka alkali ee lagu daray (cuf ahaan, isla kan hoose) waa 0.1-0.6 jeer ka badan suufka la safeeyey, xaddiga biyaha jilicsanna waa 0.3-1.0 jeer ka badan suufka la safeeyey; dareeraha aan firfircoonayn waa isku-darka aalkolada iyo hydrocarbon, xaddiga dareeraha aan firfircoonayn ee lagu darayna waa suuf la safeeyey. 7-15 jeer: dareeraha aan firfircoonayn sidoo kale wuxuu noqon karaa aalkolo leh 3-5 atamka kaarboon (sida khamriga, propanol), acetone. Waxa kale oo uu noqon karaa hydrocarbons aliphatic iyo hydrocarbons udgoon; heerkulka waa in lagu xakameeyaa 0-35°C inta lagu jiro alkalasaarid; waqtiga alkalasaariddu waa qiyaastii 1 saac. Hagaajinta heerkulka iyo waqtiga waxaa lagu go'aamin karaa iyadoo loo eegayo shuruudaha agabka iyo badeecada.
Kala-soocidda: Ka dib marka la daaweeyo alkaliin-ka, marka lagu jiro xaalado faaruq ah, kala-soocidda waxaa lagu sameeyaa iyadoo lagu darayo wakiil ka-soocidda, wakiilka ka-soocidda waa propylene oxide. Si loo yareeyo isticmaalka wakiilka ka-soocidda, wakiilka ka-soocidda ayaa laba jeer lagu daray inta lagu guda jiro habka kala-soocidda.
Waqtiga boostada: Abriil-28-2024